JP2019025212A - Drain tube, production method and tube production device - Google Patents

Abstract

To provide a drain tube capable of discharging in a short time, a body fluid accumulated in a body with a high suction amount.SOLUTION: There is provided a drain tube 1 comprising in the order from a tip end side: a suction pipe part 2; a connection pipe part 3; and an outflow pipe part 4 in an integrated state, in which a channel communicated from a tip end to a rear end is formed in the suction pipe part, connection pipe part and outflow pipe part. In the suction pipe part 2 and connection pipe part 3, a partition part extended from a tip end to a rear end of the connection pipe part 3, is provided. In the suction pipe part 2 and the connection pipe part 3, plural channels extended in an axial direction and partitioned by the partition part are formed. The plural channels merges to become one channel at a boundary between the connection pipe part 3 and outflow pipe part 4, and on an outer wall of the suction pipe part 2, one or more slits 18 formed into a spiral shape from the tip end along the axial direction are provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drain tube, a manufacturing method thereof, and a tube manufacturing apparatus.

  Conventionally, a wound drain catheter in which a drain and an outflow tube are connected by a connector has been used as a surgical medical device that discharges bodily fluids such as blood accumulated in an affected part after surgery to the outside of the body (for example, patent document) 1). In the drainage of the wound drainage catheter, a partition having a cross-shaped cross section extending from the front end to the rear end is provided in the cylindrical outer wall to form four flow paths extending in the axial direction, and these four flow paths are formed on the outer wall. A slit extending along each of the flow paths is formed.

When using the wound drain catheter, for example, the drain and connector portions are inserted into the body, the drain is left in the affected area, and the rear end portion of the outflow tube is taken out of the body and connected to a suction machine or the like. To do. As a result, blood or the like accumulated in the affected area enters the flow path from the drain slit and is discharged out of the body through the outflow tube.
However, the connection of the drain and the outflow pipe by such a connector requires a connection work and is complicated to manufacture. Further, when pulling out from the body, there is a possibility that the drain is removed from the connector and remains in the body, or the outflow pipe is detached from the connector and the drain and the connector remain in the body.

  In recent years, as a surgical medical device that discharges bodily fluids such as blood to the outside of a body, for example, a suction tube portion, a connecting tube portion, and an outflow tube portion are integrally formed in order from the front end, and lead from the front end to the rear end. A drain tube having a channel formed therein is widely used. In the drain tube, a partition having a cross-shaped cross section extending from the tip of the suction tube portion to the rear end of the connection tube portion is provided in the suction tube portion and the connection tube portion, and inside the suction tube portion and the connection tube portion, Four flow paths extending in the axial direction partitioned by the partition portion are formed. The plurality of flow paths merge into one at the boundary portion between the connecting pipe portion and the outflow pipe portion. In addition, four slits extending along each flow path from the front end to the rear end of the suction pipe section are formed on the outer wall of the suction pipe portion so as to correspond to each of the four flow paths. The connecting pipe part is not formed with a slit, and its axial length is usually about 100 mm.

When using the drain tube, the suction tube portion and the connecting tube portion are inserted into the body, the suction tube portion is left in the affected area, and the rear end side portion of the outflow tube portion is taken out of the body and put into a suction machine or the like. Connecting.
In the drain tube, since the suction tube portion, the connection tube portion, and the outflow tube portion are integrally formed, there is no possibility that the suction tube portion is detached from the connection tube portion when the drain tube is pulled out from the body. The drain tube can be easily manufactured by extrusion.

U.S. Pat. No. 4,465,481

  However, in the discharge of body fluid using such a drain tube, it is necessary to prevent the body from becoming excessively negative pressure, so suction by the suction machine cannot be made too strong, There is a limit. Therefore, the amount of suction by the drain tube is not sufficiently increased, and it is difficult to drain the body fluid accumulated in the body in a short time.

  An object of this invention is to provide the drain tube which can discharge | emit the bodily fluid with a high suction | inhalation amount in the body in a short time, its manufacturing method, and a tube manufacturing apparatus.

The present invention has the following configuration.
[1] A resin drain tube in which a suction tube portion, a connecting tube portion, and an outflow tube portion are integrally formed in order from the front end, and a flow path leading from the front end to the rear end is formed therein, the suction tube portion A partition portion extending from the front end to the rear end of the connection tube portion is provided in the tube portion and the connection tube portion. Inside the suction tube portion and the connection tube portion, an axial direction partitioned by the partition portion is provided. A plurality of extending flow paths are formed, and the plurality of flow paths merge together at a boundary portion between the connecting pipe portion and the outflow pipe portion, and extend from the tip to the outer wall of the suction pipe portion along the axial direction. A drain tube comprising one or more spirally formed slits.
[2] A cylindrical out-die, a first in-die disposed in the out-die so that a tip thereof is aligned with the tip of the out-die, and a longitudinal direction thereof along the out-die, and a tip side of the out-die A first indie provided around the central axis of the out die and moving in a radial direction of the out die, and having the same center as viewed from the front end side. A plurality of fan-shaped inner pieces having corners are provided, and when the plurality of inner pieces are brought into close contact with each other, an annular space is formed between the out die and the first indie, and the second indie is The front die viewed from the front side is provided in contact with the out die at a position corresponding to the inner piece, and moves in the radial direction of the out die. Comprising one or more of the distal piece of the columnar extending in the radial direction of the Todaisu tube manufacturing apparatus comprising an extrusion mold rotatable the one or more front end side piece around the central axis of the out die.
[3] A cylindrical out die, a first indie provided in the out die so that a tip thereof is aligned with a tip of the out die, and a longitudinal direction thereof along the out die, and a second in die are provided. The first indies are provided around the central axis of the out die, and include a plurality of fan-shaped inner pieces having the same central angle as viewed from the front end side, and the inner pieces are mutually connected. The first indie includes a central piece that can be fitted into the space formed between the inner pieces, and the central piece is formed of the out die. The first indie is movable in the axial direction, and a cross-sectional shape perpendicular to the longitudinal direction is a circular shape, and an annular space is formed between the first indie and the out die, The second indie is provided so as to be in contact with the outer peripheral surface of the first die and the inner peripheral surface of the out die, and the second indie moves in the axial direction of the out die. A tube manufacturing apparatus comprising one or more columnar outer pieces extending in the direction, and the outer piece includes an extrusion mold that can rotate around a central axis of the out die.

[4] A method for producing a drain tube according to [1], wherein the resin composition is continuously supplied to an extrusion mold provided in the tube production apparatus according to [2], while the one or more A method for producing a drain tube, in which the resin composition is extruded while rotating a tip-side piece around a central axis of the out die.
[5] A method for producing a drain tube according to [1], wherein the resin composition is continuously supplied to an extrusion mold provided in the tube production apparatus according to [3], while the one or more A method for producing a drain tube in which the resin composition is extruded while rotating an outer piece around a central axis of the out die.

The drain tube of the present invention has a high suction amount and can discharge body fluid accumulated in the body in a short time.
According to the method for producing a drain tube of the present invention, it is possible to produce a drain tube capable of discharging a bodily fluid that has a high suction amount and accumulated in the body in a short time.
If the tube manufacturing apparatus of this invention is used, the tube which can discharge | emit the bodily fluid with which the amount of suction was high and accumulated in the body in a short time can be manufactured.

It is the perspective view which showed an example of the drain tube of this invention. It is the perspective view which expanded the front end side of the suction pipe part in the drain tube of FIG. It is the side view to which the periphery of the connection pipe part in the drain tube of FIG. 1 was expanded. It is AA sectional drawing of the drain tube of FIG. It is BB sectional drawing of the drain tube of FIG. It is CC sectional drawing of the drain tube of FIG. It is an example of the extrusion mold of 1st embodiment of this aspect, and is the front view which showed the state at the time of shaping | molding of an outflow pipe part. It is the front view which showed the state at the time of shaping | molding of the suction pipe part in the metal mold | die for extrusion molding of FIG. It is the front view which showed the state at the time of shaping | molding of the connection pipe part in the metal mold | die for extrusion molding of FIG. It is an example of the extrusion mold of 2nd embodiment of this aspect, and is the perspective view which expanded the front end side. (A) It is the perspective view which expanded the front end side of the out die of 2nd embodiment. (B) It is the perspective view which expanded the front end side of the inner side piece of 2nd embodiment. (C) It is the perspective view which expanded the front end side of the center piece of 2nd embodiment. (D) It is the perspective view which expanded the front end side of the outer side piece of 2nd embodiment. It is the front view of the front end side which showed the state at the time of shaping | molding of the suction pipe part in the metal mold | die for extrusion molding of 2nd embodiment. It is the perspective view which expanded the front end side which showed the state at the time of shaping | molding of the suction pipe part in the metal mold | die for extrusion molding of 2nd embodiment. It is the perspective view which expanded the front end side which showed the state at the time of shaping | molding of the connection pipe part in the metal mold | die for extrusion molding of 2nd embodiment. It is the perspective view which expanded the front end side which showed the state at the time of shaping | molding of the outflow pipe part in the metal mold | die for extrusion molding of 2nd embodiment.

  The first aspect of the present invention is a drain tube, and the second aspect of the present invention is a drain tube manufacturing apparatus and a drain tube manufacturing method.

In the present invention, the suction tube portion is located on the distal end side of the drain tube, and a plurality of flow paths are formed by a partition portion inside the outer wall, and a slit is formed in the outer wall along one or more of the flow paths from the distal end. Means the part where is formed.
The outflow pipe portion means a portion that is located on the rear end side of the drain tube, does not have a partition portion inside the outer wall, and is not formed with a slit.
The connecting pipe portion is a portion that is located between the suction pipe portion and the outflow pipe portion in the drain tube, has a plurality of flow paths formed by the partition portion inside the outer wall, and no slit is formed. The boundary between the suction tube portion and the connecting tube portion coincides with the position of the rear end of the longest slit among the slits formed on the outer wall of the drain tube so as to extend from the tip. The boundary between the connecting pipe part and the outflow pipe part coincides with the position of the rear end of the partition part.

[Drain tube]
Hereinafter, one embodiment of the drain tube of the first aspect of the present invention will be described as an example.
As shown in FIG. 1, the drain tube 1 of the present embodiment is a resin tube in which a suction tube portion 2, a connecting tube portion 3, and an outflow tube portion 4 are integrally formed in order from the tip 1 a. The suction pipe part 2, the connecting pipe part 3 and the outflow pipe part 4 are provided with a cylindrical outer wall 10 having flexibility, and a flow path leading from the front end 1a to the rear end 1b is formed inside the outer wall 10. Yes.

  In the present embodiment, the thickness of the outer wall 10 is determined by taking into consideration the flexibility of the drain tube 1, the difficulty of being crushed when inserted into the body, the difficulty of breaking during the milking operation, and the like. What is necessary is just to determine suitably according to etc. The thickness of the outer wall 10 can be 0.4-2.0 mm, for example.

As shown in FIGS. 2 to 5, a partition portion 12 extending from the front end 1 a to the rear end 3 a of the connection tube portion 3 is provided in the suction tube portion 2 and the connection tube portion 3.
The partition portion 12 in this example includes a rod-shaped core portion 14 extending along the central axis inside the suction tube portion 2 and the connecting tube portion 3, and extends from the core portion 14 to the inner surface of the outer wall 10, and the suction tube portion 2 and And four strip-shaped partition plates 16 formed so as to extend in the axial direction of the connecting pipe portion 3.

  The four partition plates 16 are formed radially from the core portion 14 at intervals of 90 degrees around the axis in a cross section cut in a direction perpendicular to the axial direction of the drain tube 1. Thereby, four flow paths 20 partitioned around the central axis by the partitioning portion 12 are formed inside the suction tube portion 2 and the connecting tube portion 3. As shown in FIGS. 3 and 6, the four flow paths formed inside the suction pipe part 2 and the connection pipe part 3 merge at the boundary portion between the connection pipe part 3 and the outflow pipe part 4, and the outflow pipe part. 4 has one flow path 22.

The thickness of the partition plate 16 is not particularly limited. The thickness of the partition plate 16 is appropriately determined in consideration of the width of the flow path 20 partitioned by the partition plate 16 and the difficulty of crushing the suction tube portion 2 and the connecting tube portion 3 when inserted into the body. Just decide. The thickness of the partition plate 16 can be set to 0.4 to 1.0 mm, for example.
The thickness of the partition plate 16 may be constant from the core portion 14 to the outer wall 10 or may be changed. It is preferable that the thickness of the partition plate 16 is constant from the core portion 14 to the outer wall 10 in that it is easy to suppress the partition plate 16 from being bent and the suction tube portion 2 and the connecting tube portion 3 from being crushed.

  In the present embodiment, the number of the flow paths 20 formed inside the suction pipe portion 2 and the connection pipe portion 3 is not limited to 4, and may be 3 or less, or 5 or more. For example, in the cross section cut in the direction perpendicular to the axial direction of the drain tube 1, the three partition plates 16 are arranged radially from the core portion 14 at intervals of 120 degrees around the axis inside the suction tube portion 2 and the connecting tube portion 3. The aspect provided with the formed partition part 12 and the three flow paths 20 around the central axis by the partition part 12 inside the suction pipe part 2 and the connection pipe part 3 may be sufficient.

  Since the number of the partition plates 16 of the partition part 12 increases as the number of the flow paths 20 increases, the flexibility of the suction pipe part 2 decreases, and the suction pipe part 2 tends to be difficult to be placed at a target position in the body. . Further, the flow path 20 is narrowed and the amount of suction tends to decrease, and the suction tube portion 2 and the connecting tube portion 3 tend not to be crushed when inserted into the body. In terms of the balance between the ease of placement of the suction tube unit 2 at the target position, the width of the flow path 20, and the difficulty of crushing the suction tube unit 2 and the connecting tube unit 3 when inserted into the body, the suction tube unit 2 and the number of the flow paths 20 formed inside the connecting pipe part 3 are preferably 2 to 4, and 4 is particularly preferable.

As shown in FIGS. 1 to 4, four slits 18 extending along each of the four flow paths 20 partitioned by the partition portion 12 are formed on the outer wall 10 of the suction tube portion 2 from the tip 1 a to the suction tube portion 2. To the rear end 2a. That is, a slit 18 extending from the front end 1 a to the rear end 2 a of the suction tube portion 2 is formed at a position corresponding to each of the four flow paths 20 on the outer wall 10 of the suction tube portion 2. The slit 18 is formed in a spiral shape along the axial direction.
Since the slit 18 is formed in the outer wall 10 of the suction tube portion 2, body fluid can be sucked into the flow path 20 from the outer peripheral portion of the suction tube portion 2 through the slit 18. This makes it possible to suck out body fluid from a wider area in the body than when there is no slit 18. In addition, since the slit 18 is formed in a spiral shape along the axial direction, the slit 18 has a front end 1a to a rear end 2a as compared with a case where the slit 18 is formed linearly along the axial direction. The length up to becomes longer. For this reason, a surface area becomes large compared with the case where the slit 18 is formed in linear form, and it becomes possible to attract more body fluids. Furthermore, the body fluid accumulated in the body can be sucked in more ways.

  In the present embodiment, the slit 18 formed in the suction tube portion 2 extends along the axial direction of the drain tube 1, and the tip thereof reaches the tip 1 a of the drain tube 1. As a result, even if the body tissue grows so as to enter the slit 18 portion when the suction tube portion 2 is placed in the body, the body tissue moves along the slit 18 when the suction tube portion 2 is pulled out of the body. It can move to the tip 1a of the suction tube portion 2 and come out. Therefore, it is possible to prevent the body tissue that has entered the slit 18 portion from being torn when the suction tube portion 2 is pulled out of the body.

  The width of the slit 18 may be appropriately determined according to the outer diameter of the drain tube 1 and the like, taking into account the outer diameter of the suction tube portion 2, the suction amount of body fluid, and the like. The width of the slit 18 can be set to 0.4 to 1.2 mm, for example.

  In the present embodiment, the number of slits 18 is not limited to 4, and may be 3 or less, or 5 or more. Further, the number of slits 18 formed in the outer wall 10 of the suction tube portion 2 may be the same as or different from the number of flow paths 20 formed in the suction tube portion 2. For example, when the four flow paths 20 are formed inside the suction pipe portion 2 as in the drain tube 1, three slits 18 are formed on the outer wall 10 of the suction pipe portion 2 from the tip 1 a. There may be.

When a plurality of slits 18 are formed in the outer wall 10 of the suction tube portion 2, the lengths of the slits 18 may be the same or different.
The length of the suction tube portion 2 in the axial direction is not particularly limited, and may be appropriately determined in consideration of the position where the drain tube 1 is placed in the body. The length of the suction pipe part 2 in the axial direction can be set to, for example, 30 to 500 mm.

  In this embodiment, 30-150 mm is preferable and, as for the length of the axial direction of the connection pipe part 3, 50-100 mm is more preferable. If the axial length of the connecting pipe portion 3 is equal to or greater than the lower limit value, the drain tube 1 can be manufactured more easily. If the axial length of the connecting pipe part 3 is not more than the upper limit value, the flow resistance in the connecting pipe part 3 becomes smaller, and it is easy to sufficiently increase the suction amount even if the suction by the suction machine is not strong. Become. Therefore, it becomes easy to drain the body fluid accumulated in the body in a short time.

The outflow pipe part 4 is a part in which at least a part on the rear end 1b side is exposed to the outside during use. When the drain tube 1 is used, the rear end 1b of the outflow pipe portion 4 is connected to a suction machine or the like.
In the outflow pipe portion 4, the partition portion 12 is not provided in the outer wall 10, and the inside is a single flow path 22.
The length of the outflow pipe portion 4 in the axial direction is not particularly limited and can be determined as appropriate. The axial length of the outflow pipe portion 4 can be set to 90 to 2000 mm, for example.

  The length of the drain tube 1 in the axial direction is not particularly limited and can be appropriately determined. The length of the drain tube 1 in the axial direction can be set to 150 to 2650 mm, for example.

The outer diameter of the drain tube 1 is not specifically limited, What is necessary is just to determine suitably according to a use. The outer diameter of the drain tube 1 can be 2-10 mm, for example.
The outer diameters of the suction tube portion 2, the connecting tube portion 3, and the outflow tube portion 4 are preferably the same from the viewpoint of easy insertion into the body and extraction from the body. In addition, the outer diameters of the suction tube portion 2, the connecting tube portion 3, and the outflow tube portion 4 may be different as long as the effects of the present invention, the insertability into the body, and the external pullability are not impaired.

  As a material for forming the drain tube 1 of the present embodiment, silicone rubber is preferable. Silicone rubber is softer than soft polyurethane or the like. Therefore, by forming the drain tube 1 with silicone rubber, the suction tube portion 2 can be easily placed at a target position in the body.

  The drain tube 1 is preferably blended with a contrast agent to enable contrast using X-rays. In particular, it is preferable to add a contrast agent to the suction tube portion 2 and the connecting tube portion 3 which are portions inserted into the body in the drain tube 1. As a result, it is possible to confirm whether or not the suction tube portion 2 is placed at a target position in the body. Further, even if the suction tube portion 2 and the connecting tube portion 3 are completely removed when the drain tube 1 is pulled out, the cut portion existing in the body can be confirmed, so that the drain tube 1 is not unexpectedly left in the body. be able to.

As a contrast agent, a publicly known thing can be used, for example, barium sulfate, titanium oxide, etc. are mentioned.
As the contrast agent, one kind may be used alone, or two or more kinds may be used in combination.

The greater the amount of contrast agent added to the drain tube 1, the lower the strength of the drain tube 1, and the easier it is to break, or it tends to collapse when inserted into the body. Therefore, when a contrast agent is blended in the drain tube 1, it is preferable to partially blend the contrast agent at a specific site in the drain tube 1.
Specifically, for example, in the case of the drain tube 1, a contrast agent can be blended in one of the four partition plates 16 in the partition portion 12 from the front end 1a to the rear end 1b. Further, a contrast agent can be blended in a part of the outer wall 10 of the suction tube portion 2, the connecting tube portion 3 and the outflow tube portion 4.

  When the drain tube 1 is used, the suction tube portion 2 and the connecting tube portion 3 are inserted into the body, the suction tube portion 2 is left in the affected area, and the rear end 1b side portion of the outflow tube portion 4 is taken out of the body. Connect to a suction machine. By aspirating with a suction machine or the like in this state, blood or the like accumulated in the affected area enters the flow path 20 from the slit 18 portion of the drain tube 1 and is discharged out of the body through the connecting pipe section 3 and the outflow pipe section 4.

  In the drain tube 1 of the present embodiment, the angle formed by the center line O2 of the slit 18 and the tube axis O1 in plan view is θ as shown in FIG. The angle θ formed by the center line O2 of the slit 18 and the tube axis O1 in plan view is not particularly limited, and θ is preferably 1 ° to 45 °, more preferably 5 ° to 30 °, and more preferably 10 ° to 20 °. More preferably, it is less than 0 °. When the angle θ formed by the center line O2 of the slit 18 and the tube axis O1 in a plan view is equal to or larger than the lower limit value, the amount of body fluid that can be sucked can be further increased. The drain tube 1 can be more easily pulled out if it is below the upper limit. The angle θ formed by the center line O2 of the slit 18 and the tube axis O1 in a plan view can be determined as appropriate by changing the rotational speed of an extrusion mold described later.

The pitch (length that goes around the outer wall) P of the slits 18 is expressed by the above θ, and is expressed by the following formula, where R is the outer diameter of the drain tube 1.
P = πR / sin θ
When R is constant, the pitch depends on the magnitude of θ. When 1 ° ≦ θ ≦ 45 °, the pitch decreases as θ increases.
The length of the pitch is preferably 30 to 150 mm, and more preferably 50 to 100 mm. When the pitch length is equal to or greater than the lower limit value, the strength of the drain tube 1 is easily maintained, and when the pitch length is equal to or smaller than the upper limit value, the amount of body fluid that can be sucked is more likely to increase.

[Tube manufacturing equipment]
The drain tube manufacturing apparatus (hereinafter referred to as a tube manufacturing apparatus) according to the second aspect of the present invention is an apparatus for manufacturing a drain tube in which a slit is formed in a spiral shape along the axial direction. The tube manufacturing apparatus of this aspect can be used suitably for manufacture of the drain tube of this invention. One embodiment of the tube manufacturing apparatus according to this aspect includes an extrusion mold and an extruder that supplies a resin composition to the extrusion mold.

[First embodiment]
(Extrusion mold)
The extrusion mold is an extrusion mold for extruding a drain tube. Hereinafter, an embodiment of an extrusion mold according to this embodiment will be described as an example.
As shown in FIG. 7, the extrusion mold 100 according to the first embodiment of the present aspect is provided in a cylindrical out die 110 and in the out die 110 so that the tip is aligned with the tip of the out die 110. The first indie 112 whose longitudinal direction is along the out die 110 and the second indie 114 provided on the front end side of the out die 110 are provided.

The out die 110 is a cylindrical member. The cross-sectional shape perpendicular to the length direction of the hollow portion in the out die 110 is circular.
The out die 110 is supplied with a resin composition that forms a drain tube from the rear end side toward the front end side, and the resin composition is extruded from the front end of the out die 110 to form a tube.
The size of the out die 110 is not particularly limited, and may be appropriately designed according to the outer diameter of the drain tube to be manufactured.

The first in-die 112 includes four columnar inner pieces 112 a to 112 d extending in the axial direction of the out-die 110. The positions of the tips of the inner pieces 112 a to 112 d in the axial direction of the out die 110 are aligned with the tips of the out die 110.
The front view shape seen from the front end side of the inner pieces 112a to 112d is a fan shape with a central angle of 90 degrees. In a front view when the first indie 112 is viewed from the front end side, the inner pieces 112a to 112d are provided around the central axis O3 of the out die 110 so as to abut corner portions forming a central angle.

The four inner pieces 112 a to 112 d in the first in-die 112 are configured to move in the radial direction of the out-die 110.
In this example, when the four inner pieces 112a to 112d in the first indie 112 are brought into close contact with each other without any gap in the out die 110, the front view shape viewed from the front end side becomes a circular shape. At this time, an annular space 116 is formed between the out die 110 and the first in die 112. A cylindrical outer wall 10 in the drain tube 1 described later is formed by the resin composition discharged from the space 116.

  Further, as shown in FIGS. 8 and 9, when the four inner pieces 112a to 112d are moved to the outside in the radial direction of the out die 110 and separated from each other, the front pieces as viewed from the front end side are spaced from each other. A cross-shaped space 118 is formed. By the resin composition discharged from the space 118, a suction pipe part 2 and a cross-shaped partition part 12 of the connecting pipe part 3 in the drain tube 1 described later are formed.

The size of the inner pieces 112a to 112d of the first indies 112 is not particularly limited, and may be appropriately designed according to the sizes of the outer wall 10 and the partition portion 12 of the drain tube 1 to be manufactured.
The mechanism for moving the inner pieces 112a to 112d in the out die 110 in the radial direction of the out die 110 is not particularly limited, and a known mechanism employed when moving a member in the mold, such as air drive or servo drive, is adopted. can do.

  The second indie 114 includes four front end pieces 114a to 114d at positions corresponding to the inner pieces 112a to 112d of the first indie 112, respectively, when viewed from the front end side. The distal end piece 114a corresponds to the inner piece 112a, and the distal end piece 114b corresponds to the inner piece 112b. The distal end piece 114c corresponds to the inner piece 112c, and the distal end piece 114d corresponds to the inner piece 112d.

The four front end pieces 114 a to 114 d are columnar members extending in the radial direction of the out die 110. In this example, the front end pieces 114 a to 114 d are narrower on the front end side than the rear end side in a front view as viewed from the front end side of the out die 110. The four tip side pieces 114 a to 114 d are provided on the tip side of the out die 110 so that the side surfaces of the tip side pieces 114 a to 114 d are in contact with the tip of the out die 110.
Each of the four front end pieces 114 a to 114 d is configured to move in the radial direction of the out die 110 while being in contact with the front end of the out die 110.

When the distal end side pieces 114a to 114d are moved inward in the radial direction of the out die 110, the distal end portions of the distal end side pieces 114a to 114d come into contact with the inner pieces 112a to 112d of the first indie 112, respectively. Yes.
As shown in FIG. 8, with the inner pieces 112 a to 112 d of the first indies 112 being spaced apart from each other, the tip side pieces 114 a to 114 d are placed in the diameter of the out die 110 until the tip portions contact the inner pieces 112 a to 112 d. It can be moved inside the direction. By discharging the resin composition from the extrusion mold 100 in this state, the outer wall 10 in which the slits 18 are formed is formed.

  The distal end side pieces 114 a to 114 d can be rotated around the central axis O <b> 3 of the out die 110. The tip side pieces 114a to 114d are moved inward in the radial direction of the out die 110 until the tip part contacts the inner pieces 112a to 112d, and the tip side pieces 114a to 114d are rotated around the central axis O3. In this state, by discharging the resin composition from the extrusion mold 100, it is possible to obtain the drain tube 1 having four slits formed in the outer wall in a spiral shape along the axial direction from the tip.

The shape and size of the tip side pieces 114a to 114d of the second indie 114 are not particularly limited, and may be appropriately designed according to the shape and width of the slit 18 formed in the outer diameter 10 of the drain tube 1 to be manufactured.
The mechanism for moving the distal end pieces 114a to 114d in the radial direction of the out die 110 on the distal end side of the out die 110 is not particularly limited, and is a known mechanism that is employed when moving a member in a mold such as air drive or servo drive. A mechanism can be employed.
The mechanism for rotating the tip side pieces 114a to 114d around the center axis O3 of the out die 110 on the tip side of the out die 110 is not particularly limited, and when moving a member in the mold such as air driving or servo driving. It is possible to employ a known mechanism employed in the above.

(Extruder)
The extruder supplies the resin composition from the rear end side to the front end side to the extrusion mold. It does not specifically limit as an extruder, A well-known extruder can be employ | adopted.
A gear pump may be provided between the extrusion mold and the extruder. Thereby, the supply amount of the resin composition from the extruder to the extrusion mold can be easily controlled.
The gear pump is not particularly limited, and a known gear pump can be employed.

[Drain tube manufacturing method]
In the tube manufacturing apparatus including the extrusion mold 100 according to the first embodiment of the present aspect, the first and second indies 112 and 114 are supplied while continuously supplying the resin composition to the extrusion mold 100. By moving in the radial direction of the out die 110 and rotating the four tip side pieces 114a to 114d around the central axis O3 of the out die 110, the suction pipe part 2, the connecting pipe part 3, and the outflow pipe part 4 Can be integrally extruded to obtain the drain tube 1.

  Specifically, as shown in FIG. 8, the four inner pieces 112 a to 112 d of the first indie 112 are moved to the outside in the radial direction of the out die 110, and the inner pieces 112 a to 112 d are all separated from the out die 110. And the inner pieces 112a to 112d are separated from each other. At this time, an annular space 116 is formed between the out die 110 and the four inner pieces 112a to 112d in a front view as viewed from the front end side, and a cross shape is formed between the inner pieces 112a to 112d. Space 118 is formed. Further, the tip side pieces 114a to 114d of the second indie 114 are moved inward in the radial direction of the out die 110 until their tip portions come into contact with the inner pieces 112a to 112d, respectively. As a result, when the extrusion mold 100 is viewed from the front end side, the annular space 116 is partially blocked by the four front end pieces 114 a to 114 d of the second indie 114.

Next, the four tip side pieces 114 a to 114 d of the second indie 114 are rotated around the central axis O <b> 3 of the out die 110. In the present embodiment, as shown in FIG. 7, the four tip side pieces 114 a to 114 d are rotated counterclockwise in plan view as viewed from the tip side. The rotation direction of the four tip-side pieces 114a to 114d is not limited to one direction, and may be rotated clockwise in a plan view when viewed from the tip side.
In this state, the resin composition is supplied from the extruder to the extrusion mold 100 from the rear end side to the front end side. The supplied resin composition is discharged from the tip of the extrusion mold 100 into the shape of the suction tube portion 2. The outer wall 10 is formed by the resin composition discharged from the annular space 116 in the out die 110, and along the axial direction at positions corresponding to the four front end side pieces 114 a to 114 d of the second indie 114 in the outer wall 10. Thus, four slits 18 are spirally formed. Moreover, the partition part 12 is formed with the resin composition discharged from the cross-shaped space 118 formed between the inner pieces 112a to 112d.

  Next, as shown in FIG. 9, while supplying the resin composition to the extrusion mold 100, the tip-side pieces 114 a to 114 d of the second die 114 are placed outside the radial direction of the out die 110 in an annular space. Move to outside 116. Thereafter, the rotation of the four tip side pieces 114a to 114d of the second indie 114 is stopped. Then, the annular space 116 is not obstructed by the tip-side pieces 114a to 114d when the extrusion mold 100 is viewed from the tip side. At this time, the four inner pieces 112a to 112d of the first indie 112 are kept separated from each other. In this state, the resin composition supplied to the extrusion mold 100 is discharged from the tip of the extrusion mold 100 into the shape of the connecting pipe portion 3.

  Next, as shown in FIG. 7, while supplying the resin composition to the extrusion mold 100, the inner pieces 112 a to 112 d of the first indies 112 are moved inward in the radial direction of the out dice 110, respectively. Adhere closely so as not to form a gap between them. In this state, the resin composition supplied to the extrusion mold 100 is discharged from the tip of the extrusion mold 100 into the shape of the outflow pipe portion 4. Thereby, the drain tube 1 in which the suction pipe part 2, the connecting pipe part 3, and the outflow pipe part 4 are integrally formed is obtained.

In the extrusion mold according to the first embodiment of the present aspect, the number of inner pieces of the first indie is not limited to four. Specifically, in the extrusion mold of the present invention, the three inner pieces of the same shape having a fan shape with a central angle of 120 degrees when viewed from the front end side have a circular cross-sectional shape of the hollow portion. An extrusion mold provided with a first in-die provided around the center axis of the out-die may be used. If this extrusion mold is used, a drain tube having a suction pipe part and a connecting pipe part in which three partition plates are radially formed at intervals of 120 degrees around the central axis from the core part can be obtained.
In addition, the extrusion mold according to the first embodiment of the present aspect has five identical inner pieces having a fan shape with a central angle of 72 degrees when viewed from the front end side, and the cross-sectional shape of the hollow portion is the same. An extrusion mold provided with a first in-die provided around the central axis of a circular out-die may be used. If this extrusion mold is used, a drain tube having a suction tube portion and a connecting tube portion in which five partition plates are radially formed at intervals of 72 degrees around the central axis from the core portion is obtained.
Moreover, when it is set as the 1st indie which combined the fan-shaped inner piece in front view shape in this way, the front view shape of each of these inner pieces may differ. For example, for extrusion molding including a first in-die comprising a combination of two inner pieces having a fan shape with a central angle of 120 degrees and a fan shape having a central angle of 60 degrees. It may be a mold.

  The number of the tip side pieces of the second indies in the extrusion mold according to the first embodiment of the present embodiment is not limited to four as long as it is one or more. The number of slits formed in the outer wall corresponds to the number of the tip-side pieces, and may be one, two, three, or five or more. Moreover, the number of the tip side pieces of the second indies may be the same as or different from the number of the inner pieces of the first indies. Specifically, the extrusion mold of the present invention may be, for example, an extrusion mold that includes the second indies having three tip-side pieces 114a in the extrusion mold 100. When the extrusion mold is used, a drain tube having four flow paths in the suction pipe portion and three slits formed in the outer wall is obtained.

[Second Embodiment]
(Extrusion mold)
Next, the mold 200 for extrusion molding of 2nd embodiment of this aspect is demonstrated. As shown in FIG. 10, the extrusion mold 200 is provided in a cylindrical out die 210 and an out die 210 so that the tip is aligned with the tip of the out die 210, and the longitudinal direction is the out die 210. A first in-die 212 and a second in-die 214 are provided.

  The out die 210 includes a cylindrical outer wall 210a as shown in FIG. Four openings 210b to 210e extending in the axial direction are formed in the outer wall 210a at intervals of 90 degrees in the circumferential direction. The resin composition supplied from the extruder flows into the out die 210 from the four openings 210b to 210e.

As shown in FIG. 11 (b), the first indie 212 includes four columnar inner pieces 212a to 212d whose tip surface has a fan shape with a central angle of 90 degrees. As shown in FIG. 11C, the first indie 212 includes a central piece 212e that is a columnar member having a cross-shaped tip surface. The four inner pieces 212a to 212d are arranged so as to face each other and so as to form a cruciform space 218 between each other when viewed from the front side.
The central piece 212e can be fitted in the space 218 and is movable in the axial direction of the out die 210.
The first in-die 212 is arranged in the out-die 210 such that the four inner pieces 212 a to 212 d and the central piece 212 e are all separated from the inner surface of the out-die 210.

As shown in FIG. 10, the first in-die 212 has a circular cross section perpendicular to the longitudinal direction.
An annular space 216 is formed between the first in-die 212 and the out-die 210.

The second indie 214 is provided so as to contact the outer peripheral surface of the first indie 212 and the inner peripheral surface of the out die 210.
As shown in FIG. 11 (d), the second in-die 214 includes four columnar outer pieces 214 a to 214 d that move in the axial direction of the out-die 210 and extend in the axial direction of the out-die 210. The four outer pieces 214a to 214d are arranged on the outer peripheral sides of the four inner pieces 212a to 212d of the first die 212, respectively.
The inner surface shape of the four outer pieces 214 a to 214 d is curved so as to follow the outer peripheral surface of the first indie 212. The outer surface shapes of the four outer pieces 214 a to 214 d are curved along the inner peripheral surface of the out die 210.
The four outer pieces 214a to 214d move forward in conjunction with the axial direction of the out die 210 while the inner surface is in contact with the outer peripheral surface of the first die 212 and the outer surface is in contact with the inner peripheral surface of the out die 210. It is possible to retreat.
A mechanism for moving the central piece 212e and the outer pieces 214a to 214d in the axial direction of the out die 210 is not particularly limited, and a known mechanism that is employed when moving a member in the mold, such as air drive or servo drive, is employed. be able to.

As shown in FIG. 12, the four outer pieces 214 a to 214 d of the second indie 214 can be rotated around the central axis O <b> 4 of the outdie 210. In the present embodiment, the four outer pieces 214a to 214d can be rotated counterclockwise in plan view when viewed from the front end side. The rotation direction of the four outer pieces 214a to 214d is not limited to one direction, and the outer pieces 214a to 214d may be rotated clockwise in a plan view when viewed from the front end side.
A mechanism for rotating the out die 210 around the central axis O4 is not particularly limited, and a known mechanism employed when moving a member in the mold, such as air driving or servo driving, can be employed.

(Extruder)
The same extruder and gear pump as those used in the first embodiment can be used. The extruder and the gear pump may be the same as or different from those used in the first embodiment.

[Drain tube manufacturing method]
A method of manufacturing the drain tube 1 using a tube manufacturing apparatus including the extrusion mold 200 according to the second embodiment of the present aspect will be described.
As shown in FIG. 13, the tips of the four inner pieces 212 a to 212 d of the first die 212 and the tips of the four outer pieces 214 a to 214 d of the second die 214 are aligned with the tips of the out die 210. The central piece 212e is in a state of being retracted in the axial direction.
Next, the four outer pieces 214 a to 214 d of the second in-die 214 are rotated around the central axis O <b> 4 of the out-die 210.
In this state, the resin composition is supplied from the extruder to the extrusion mold 200 while the supply amount is controlled by the gear pump. The supplied resin composition passes through the inside of the out die 210 from the four openings 210b to 210e, and is discharged from the tip of the extrusion mold 200 into the shape of the suction pipe portion 2. The outer wall 10 is formed by the resin composition discharged from the annular space 216 in the out die 210, and four slits 18 are spirally formed on the outer wall 10 along the length direction of the central axis O 4 of the out die 210. It is formed. Moreover, the partition part 12 of the suction pipe part 2 is formed by the resin composition discharged from the cross-shaped space 218 formed between the four inner pieces 212a to 212d of the first indie 212.

Next, the rotation of the four outer pieces 214a to 214d of the second indie 214 is stopped. As shown in FIG. 14, only the tips of the four inner pieces 212 a to 212 d of the first indie 212 are aligned with the tips of the out die 210, and the four outer pieces 214 a of the center piece 212 e of the first indie 212 and the second die 214. -214d are all set in a state of being retreated in the axial direction. In this state, by supplying the resin composition from the four openings 210b to 210e to the inside of the out die 210, the resin composition is connected from the tip of the extrusion mold 200 through the inside of the out die 210. It is discharged in the shape of the tube part 3.
Specifically, the outer wall 10 of the connecting pipe portion 3 is formed by a resin composition discharged from an annular space 216 between the inner surface of the out die 210 and the outer surfaces of the four inner pieces 212a to 212d of the first indie 212. Is formed. The partition portion 12 of the connecting pipe portion 3 is formed by the resin composition discharged from the cross-shaped space 218 formed between the four inner pieces 212a to 212d of the first indie 212.

Next, as shown in FIG. 15, the tips of the four inner pieces 212a to 212d of the first die 212 and the tips of the center piece 212e of the first die 212 are aligned with the tips of the out die 210, or the tips of the center piece 212e. Project from the tip of the out die 210 to 5 mm. The second indie 214 is in a retracted state. In this state, by supplying the resin composition from the four openings 210b to 210e to the inside of the out die 210, the resin composition is discharged into the shape of the outflow pipe portion 4 from the tip of the extrusion mold 200. Is done.
Specifically, the outer wall 10 of the outflow pipe portion 4 is formed by the resin composition discharged from the annular space 216 between the inner surface of the out die 210 and the outer surface of the first indie 212.

In this way, the suction pipe portion 2 is obtained by advancing or retracting the central piece 212e and the second in-die 214 of the first in-die 212 in the axial direction while continuously supplying the resin composition to the extrusion mold 200. The drain tube 1 can be obtained by integrally forming the connecting tube portion 3 and the outflow tube portion 4.
Further, by rotating the four outer pieces 214a to 214d of the second indie 214 around the central axis O4 of the out die 210, four slits 18 are formed in the outer wall 10 in a spiral shape along the axial direction. The suction pipe portion 2 can be obtained.

In the present embodiment, the inner surfaces of the four outer pieces 214 a to 214 d of the second indie 214 are formed along the outer peripheral surface of the first indies 212. Since the second indies 214 can rotate along the outer peripheral surface of the first indies 212, the four slits 18 can be formed more stably.
Moreover, in this embodiment, the drain tube which has the suction pipe parts 2 other than the number of flow paths can be manufactured by changing the shape of the inner pieces 212a to 212d and the central piece 212e.

The shape of the four inner pieces 212a to 212d of the first indie 212 of the present embodiment is not limited to the fan shape with the tip surface having a central angle of 90 degrees. For example, the tip surface may have a fan shape with a central angle of 120 degrees, or the tip surface may have a fan shape with a central angle of 72 degrees. The number of the inner pieces 212a to 212d is determined by the shape of a fan, and is 4 for a fan shape with a central angle of 90 degrees, 3 for a fan shape with a central angle of 120 degrees, and 5 for a fan shape with a central angle of 72 degrees. It is. A drain tube having flow paths corresponding to the number of the inner pieces 212a to 212d can be obtained.
The shape of the central piece 212e of the first indie 212 is determined according to the shape of the inner pieces 212a to 212d of the first indie 212. When the shape of the tip surface of the inner piece is a fan shape with a central angle of 120 degrees, The shape is a columnar member having a Y-shaped tip surface. When the shape of the tip surface of the inner piece is a fan shape with a central angle of 72 degrees, the shape of the center piece 212e is a columnar member in which the shape of the tip surface is a radial pattern of five lines.
The number of the outer pieces 214a to 214d of the second indie 214 is not limited to four, may be two, may be three, or may be five or more. A drain tube in which the same number of slits as the number of the outer pieces 214a to 214d of the second indie 214 is formed can be obtained.
The number of slits may be one or more, but 2 to 4 is preferable and 4 is particularly preferable from the viewpoint of the suction amount and strength of the drain tube.

In the present invention, the extrusion mold is not limited to the embodiment described above.
For example, it may be an extrusion mold in which the first die 112 in the first embodiment, the out die 210 and the second indie 214 in the second embodiment are combined, and the second die 114 in the first embodiment. It may be an extrusion mold in which the out die 210 and the first in die 212 in the second embodiment are combined.
The mechanism for moving each indie varies depending on whether the direction of moving the first indie or the second indie is the radial direction or the axial direction of the out die. From the viewpoint of ease of control of the mechanism that moves each indie, in one extrusion mold, the direction in which each indie is moved is unified with either the radial direction or the axial direction of the out die. It is preferable.
Therefore, the extrusion mold in the present invention is preferably the first embodiment or the second embodiment described above.

  In this aspect, the magnitude of the angle θ formed by the center line of the slit and the tube axis in a plan view can be adjusted by adjusting the speed at which the tip or outer piece of the second indie is rotated. When the rotation speed is increased, the angle θ increases, and in the drain tube having a certain length in the tube axis direction, the slit length is long and the slit surface area is increased. The drain tube thus obtained has a high suction amount and can discharge the body fluid accumulated in the body in a short time.

  The tube manufacturing apparatus provided with the extrusion mold according to the present invention described above is not an excessively complicated configuration, but is simple, and the suction pipe part, the connecting pipe part, and the outflow pipe part are easily extruded integrally. Tubes can be manufactured.

  According to the drain tube manufacturing method of the present invention described above, a drain tube in which slits are spirally formed along the axial direction is obtained. Therefore, in the drain tube obtained by the production method of the present invention, the bodily fluid accumulated in the body can be discharged in a short time with a high suction amount.

DESCRIPTION OF SYMBOLS 1 Drain tube, 2 Suction pipe part, 3 Connecting pipe part, 4 Outflow pipe part 10 Outer wall, 12 Partition part, 14 Core part, 16 Partition plate, 18 Slit 20, 22 Flow path 100, 200 Extrusion mold 110, 210 Out die 112, 212 First indie 112a-112d, 212a-212d Inner piece 114, 214 Second indie,
114a-114d Tip side piece 116, 118, 216, 218 Space 210a Outer die outer wall,
210b to 210e Out die opening 212e Central piece 214a to 214d Outer piece O1 Pipe axis O2 Slit centerline O3, O4 Out die central axis

Claims (5)

A drain tube made of resin in which a suction pipe part, a connecting pipe part, and an outflow pipe part are integrally formed in order from the front end, and a flow path leading from the front end to the rear end is formed therein,
In the suction pipe part and the connection pipe part, a partition part extending from the front end to the rear end of the connection pipe part is provided,
A plurality of flow paths extending in the axial direction partitioned by the partition portion are formed inside the suction tube portion and the connecting tube portion,
The plurality of flow paths merge into one at the boundary between the connecting pipe part and the outflow pipe part,
A drain tube comprising one or more slits spirally formed along the axial direction from the tip on the outer wall of the suction tube portion. A cylindrical out die, a tip is provided in the out die so that the tip is aligned with the tip of the out die, a first in die along the out die, and a tip side of the out die. A second indie,
The first indie is provided around the central axis of the out die, and moves in the radial direction of the out die, and includes a plurality of fan-shaped inner pieces having the same central angle as viewed from the front end side. Prepared,
When these inner pieces are brought into close contact with each other, an annular space is formed between the out die and the first in die,
The second indie is provided in contact with the out die at a position corresponding to the inner piece in a front view as viewed from the front end side, and moves in the radial direction of the out die, and extends in the radial direction of the out die. Comprising one or more distal end pieces,
A tube manufacturing apparatus including an extrusion mold in which the one or more tip-side pieces are rotatable around a center axis of the out die. A cylindrical out die, a first indie provided in the out die so that a tip thereof is aligned with a tip of the out die, and a longitudinal direction thereof along the out die, and a second in die,
The first indie includes a plurality of fan-shaped inner pieces provided around the central axis of the out die and having the same central angle as viewed from the front end.
The inner pieces are spaced apart so that there is a space between them,
The first indie includes a central piece that can be fitted into the space formed between the inner pieces, and the central piece is movable in the axial direction of the out die.
The first indie has a circular cross section perpendicular to the longitudinal direction,
An annular space is formed between the first indie and the out die,
The second indie is provided in contact with the outer peripheral surface of the first indie and the inner peripheral surface of the out die,
The second indie includes one or more columnar outer pieces extending in the axial direction of the out die, which move in the axial direction of the out die,
A tube manufacturing apparatus including an extrusion mold in which the outer piece is rotatable around a central axis of the out die. It is a manufacturing method of the drain tube according to claim 1,
3. While continuously supplying a resin composition to an extrusion mold provided in the tube manufacturing apparatus according to claim 2, while rotating the one or more tip side pieces around a central axis of the out die, the resin A method for producing a drain tube for extruding a composition. It is a manufacturing method of the drain tube according to claim 1,
The resin composition while rotating the one or more outer pieces around the central axis of the out die while continuously supplying the resin composition to an extrusion mold provided in the tube manufacturing apparatus according to claim 3. A method for producing a drain tube for extruding a product.

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