JP5902899B2 - Catheter connector - Google Patents

Description

  The present invention relates to a catheter connector for connecting a catheter and an infusion device.

  FIG. 6 is a longitudinal sectional view of a conventional connector 100. Regarding the structure of the connector 100, elements and parts having the same structure as the elements or parts of the connector 10 (FIG. 1) described later as an embodiment of the present invention are denoted by reference numerals attached to the elements or parts of the connector 10. The same reference numerals are attached and detailed description will be made in the description of the connector 10, and only the main points of the connector 100 will be described.

  In addition, in the elements or portions of the connector 100, those having structures different from the corresponding elements of the connector 10 are used with a three-digit code different from the corresponding elements of the connector 10. For convenience of explanation, like the connector 10, in the connector 100, the connection side of the catheter 11 is one side of the connector 100 (left side of FIG. 6), and the connection side of the infusion device is the other side of the connector 100 (FIG. 6). (Right side).

  The main body 113 of the connector 100 has a through hole 154 penetrating in the axial direction. In the through hole 154, the tapered portion 114 is located between the fitting portion 58 and the maximum diameter portion 62 in the axial direction, and has a truncated cone shape that gradually decreases in diameter from one side to the other side.

  As the surgeon tightens the cap 12 with respect to the main body 113, the cap 12 moves toward the other side, and the protrusion 14 pushes the rubber 14 in the maximum diameter portion 62 toward the tapered portion 114. The rubber 14 is deformed into the shape of the tapered portion 114 at the entry portion in the taper portion 114, and the tip of the entry portion reaches the other side of the taper portion 114 when the tightening of the cap 12 is finished. The tightening of the cap 12 ends when the outer cylindrical portion 21 of the cap 12 and the fin 50 of the main body 13 abut against each other in the axial direction.

  The rubber 14 tends to swell in the radial direction along with the axial compression from the protruding portion 24, but is prevented from expanding toward the outer peripheral side by the maximum diameter portion 62 and the tapered portion 114. The diameter of the center hole 78 is reduced. Thus, the catheter 11 is clamped in the radial direction from the rubber 14 in the center hole 78 and is fixed to the connector 100 via the rubber 14.

  In Patent Document 1, the catheter is inserted into the center hole of the cylindrical elastic member, and the elastic member is expanded radially inward by tightening the screwing member around the connector body, and the catheter is clamped by the elastic member. A catheter connector to be fixed is disclosed (FIG. 7 of Patent Document 1). In the catheter connector, the elastic member has a shaft portion of a predetermined length whose tip is tapered, and the shaft portion is passed through a predetermined cross section from the tip as the operator tightens the screw member. It press-fits into the hole (FIG. 6 of Patent Document 1). As a result, the shaft portion of the elastic member can apply a pinching pressure to the catheter over the length of the through hole into which the shaft is press-fitted in the axial direction, and the pinching length in the axial direction increases. Fixing can be strengthened.

Japanese Patent Laid-Open No. 10-80494

  FIG. 7 shows a compressed state of the rubber 14 in the conventional connector 100. With reference to FIG. 7, the problem of the conventional connector 100 will be described. 7A is a perspective view before the rubber 14 is deformed, FIG. 7B is a perspective view after the rubber 14 is deformed by the tapered portion 114 accompanying the axial compression, and FIG. 7C is a state in the state of FIG. 7B. 3 is a longitudinal sectional view of rubber 14. FIG. Since (a) is the same as FIG. 5 (a) for the rubber 14 of the connector 10, its description will be described in detail in FIG. 5 (a), and detailed description thereof will be omitted here.

  In FIG. 7, the rubber 14 has a cylindrical portion 76, a flange 77 provided continuously with the end of the cylindrical portion 76, and a center hole 78 penetrating along the center line. Since the rubber 14 is a general-purpose product, it has a flange 77, but the flange 77 can be omitted. The rubber 14 is caused to enter the tapered portion 114 from the flange 77 as the rubber 14 is pushed toward the tapered portion 114 from the projection 24 by tightening of the cap 12. The flange 77 is deformed into the shape of the tapered portion 114 and becomes a conical portion 185. The center hole 78 is appropriately crushed at the minimum diameter portion of the conical portion 185 to pinch the inner catheter 11.

  At this time, the axial length in which the rubber 14 clamps the catheter 11 is slightly L2, as can be seen from FIG. 7C, and in order to secure an appropriate fixing force of the catheter 11, a predetermined length of the distal end portion is secured. A particularly excessive pressure occurs in the range.

  The problems of the catheter connector of Patent Document 1 are as follows. (B) The surgeon needs to insert the catheter through the central hole in the relatively long shaft portion of the elastic member, which takes time. (B) Since the shaft portion of the elastic member is relatively long, sufficient rigidity is required to prevent the base portion from buckling during pushing into the through hole. (C) Since the shaft portion is press-fitted into the through-hole while applying a radial compressive force over the entire circumference, the operation when the operator tightens the screwing member to fix the catheter Power increases. (D) When loosening the screwing member and releasing the fixation of the catheter, the elastic member is screwed on the proximal end side so that the long shaft on the distal end side of the elastic member can be smoothly removed from the through hole. It is necessary to fix to the end face of the member in advance.

  An object of the present invention is to provide a catheter connector that improves the fixation of a catheter while reducing the operating force when fixing the catheter, reducing the number of rotations of the screwing member, and facilitating insertion of the catheter. It is.

  The catheter connector of the present invention has a cylindrical portion and an instrument connecting portion that are arranged on one end side and the other end side in the axial direction and are connected to each other, and the cylindrical portion is inserted from an opening provided on one end side. A connector main body that houses an end portion of a catheter and the device connecting portion is connected to an infusion device from the other end side, a tubular elastic member that is housed in the tube portion and penetrates the end portion of the catheter, and the tube A screwing member for moving the elastic member to the other end side by screwing into the tube portion from the one end side of the portion and tightening toward the other end side of the tube portion, The first through-hole portion that houses the elastic member in a substantially uncompressed state, and the elasticity that is connected to the other end side of the first through-hole portion and enters from the first through-hole portion on one end side A second through hole portion that guides the member toward the other end while gradually compressing the member into a flat cross section The other end side of the second through-hole portion is connected to the other end side of the second through-hole portion, and the elastic member entering from the second through-hole portion on one end side is held in a compressed state of a flat cross section while being on the other end side by a predetermined length. And a third through hole portion leading to

  According to the present invention, the elastic member through which the catheter is inserted has the end portion on the other end side approached from the second through hole portion to the third through hole portion as the screwing member is tightened, Is deformed into a flat cross-sectional portion having a predetermined length in the axial direction in the third through hole portion. In the flat cross-section portion of a predetermined length, the catheter penetration portion is compressed in the short side direction over a long range in the long side direction of the flat cross section, thereby increasing the clamping area of the catheter in the catheter penetration portion. In this way, the pinching property is strengthened while reducing the maximum pinching force of the catheter, and the fixation property of the catheter can be improved while preventing the catheter from being crushed. In addition, in order to obtain a predetermined fixing property for the catheter, the axial length of the flat cross-section portion of the elastic member in the extending direction of the catheter needs to be reduced by the increase in the clamping area due to the increase in the width dimension. Therefore, the operating force of the screwing member can be reduced, and the number of rotations of the screwing member can be reduced.

  Preferably, the second through-hole portion and the third through-hole portion have escape space portions of the entry portion at both ends in the long side direction of the flat cross section of the entry portion of the elastic member.

  By forming the relief space portion in the second through hole portion and the third through hole portion, the deformation of the elastic member in the short side direction of the flat cross section becomes smooth, the operating force of the screwing member is reduced, and the first The entrance portion of the elastic member in the three through holes can be sufficiently deformed in the short side direction to ensure a predetermined clamping force of the catheter by the elastic member.

  Preferably, the escape space portions of the second through hole portion and the third through hole portion are defined by slopes that gradually reduce the size of the escape space portion in the short side direction of the flat cross section from one axial end side to the other end side. It is made.

  Thereby, the approach part of the elastic member to the 2nd through-hole part and the 3rd through-hole part receives reaction force in the escape part from the slope of the escape space part toward the 1st through-hole part. Therefore, in order to release the fixation of the catheter, the elastic member automatically moves toward the first through hole portion as the screwing member is loosened, and the fixation of the catheter can be smoothly released.

Preferably, the second hole portion, a compression direction on both sides of the surface portion definitive on the other end side is formed in a circular arc having a center outside the cavity of the second hole portion.

  The elastic member enters the narrow third through-hole portion while applying the corner of the vertical cross section to the arc of the second through-hole portion. The entry becomes smooth.

The longitudinal cross-sectional view of the whole connector in the loose state of a cap. The longitudinal cross-sectional view of the connector principal part in the tightening state of a cap. III-III arrow sectional drawing of FIG. FIG. 4 is a cross-sectional view taken along arrows IV-IV in FIG. 1. FIG. 3 is a structural diagram of rubber in the connector of FIG. 1. The longitudinal cross-sectional view of the conventional connector. FIG. 7 is a structural diagram of rubber in the connector of FIG. 6.

  1 and 2, a connector 10 connects, for example, a catheter 11 as an epidural connector and a syringe as an infusion device, and is composed of three parts: a cap 12, a main body 13, and a rubber 14. For convenience of explanation, in the connector 10, the side to which the catheter 11 is connected (left side in FIGS. 1 and 2) is called “one side”, the side to which the syringe is connected (right side in FIGS. 1 and 2), and “others” We will call it “side”.

  The cap 12 has a protrusion 20, an outer cylindrical portion 21, and an inner cylindrical portion 22 having the same center line. With respect to the end wall on one side of the outer cylindrical portion 21, the protruding portion 20 protrudes on one side (outer surface side), and the inner cylindrical portion 22 protrudes on the other side (inner surface side). The outer cylindrical portion 21 and the inner cylindrical portion 22 are arranged coaxially, and an annular space 23 is formed between them. The inner cylindrical portion 22 has a protrusion 24 with a reduced diameter on the other side. The female screw portion 29 is formed on the inner peripheral portion of the outer cylindrical portion 21 within a predetermined length from the other open end of the outer cylindrical portion 21 toward the closed end on one side.

  The through hole 34 penetrates the cap 12 along the center line thereof, and is composed of three sections 35, 36, and 37 in order from one side to the other side. The cross sections of the sections 35, 36, 37 are circular. In the sections 35 and 36, the diameter gradually decreases as it proceeds from one side to the other side, and the section 37 has the same diameter over the entire range in the axial direction.

  The main body 13 includes a mounting portion 41, a slope portion 42, a throttle portion 43, a slope portion 44, and a cylindrical portion 45 in order from the other side to the one side in the axial direction. The fin 50 is formed in a flat plate shape in the range of the slope portion 42, the throttle portion 43, and the slope portion 44 in the axial direction, and protrudes radially outward from the peripheral portions of the slope portion 42, the throttle portion 43, and the slope portion 44. . A total of four fins 50 are provided at 90 ° intervals in the circumferential direction of the main body 13 (FIG. 4B described later). The male thread portion 46 is formed only in the end region on the side close to the slope portion 44 in the outer peripheral portion of the cylindrical portion 45.

  The through-hole 54 penetrates the main body 13 along the center line of the main body 13 and consists of eight sections in the axial direction. Here, the eight sections are specifically, the taper portions 55, 56, the minimum diameter portion 57, the fitting portion 58, the taper portion 59, the oblate shape portion 60, and the intermediate molding portion 61 in order from the other side to the one side. And the respective sections of the maximum diameter portion 62. The through-hole 54 has a circular cross section except for the axial range of the tapered portion 59, the flattened portion 60 and the intermediate molded portion 61. A syringe (not shown) as an infusion device is attached to the tapered portion 55 from the other side.

  The diameters of the tapered portions 55 and 56 gradually decrease from the other side to the one side. The taper portion 59 has a cross-sectional shape on one side that matches the tip cross-sectional shape of the deformed shape of the rubber 14 shown in FIG. 5B described later, and on the other side, has a minimum diameter. The portion 58 matches the circular cross-sectional shape, and the diameter gradually increases from the other side to one side. The diameters of the minimum diameter portion 57 and the fitting portion 58 are equal regardless of the axial position. The shapes of the oblate hemispherical portion 60 and the intermediate molded portion 61 will be described later with reference to FIG. Regarding the axial position range, the tapered portion 55 substantially corresponds to the mounting portion 41, the tapered portion 56 and the minimum diameter portion 57 substantially correspond to the slope portion 42, and the fitting portion 58 and the tapered portion 59 substantially correspond to the throttle portion 43. Correspondingly, the end on the other side of the flattened portion 60 substantially corresponds to the slope portion 44, and the end on one side of the flattened portion 60, the intermediate molded portion 61, and the maximum diameter portion 62 substantially correspond to the cylindrical portion 45. ing.

  Here, for convenience of explanation of the oblate hemispherical portion 60 and the intermediate molded portion 61, the short side direction and the long side direction of the flat cross-sectional portion of the oblate square shape portion 60 are respectively in the vertical direction (corresponding to the vertical direction in FIGS. 1 and 2). And a left-right direction (corresponding to a direction perpendicular to the paper surface of FIGS. 1 and 2). In FIGS. 1 and 2, the plane 70 constitutes surfaces on both sides in the vertical direction of the oblate shape portion 60, and the compression side curved surface 71 constitutes surfaces on both sides in the vertical direction of the intermediate molding portion 61.

  3 and 4 are a cross-sectional view taken along arrows III-III and a cross-sectional view taken along arrows IV-IV in FIG. 1, respectively. Further, the axial position of III-III and the axial position of IV-IV in FIG. 1 are the positions of the concave surface portion 71a and the convex surface portion 71b in the intermediate molding portion 61 in the axial direction, respectively. The compression-side curved surface 71 includes a concave surface portion 71a on one side and a convex surface portion 71b on the other side. The concave surface portion 71a and the convex surface portion 71b will be described in detail later.

  3 and 4, (a) shows the time when the rubber 14 is not present in the intermediate molding part 61, and (b) shows the time when the rubber 14 is present in the intermediate molding part 61.

  The intermediate molding part 61 includes a molding space 74 occupying the central range in the left-right direction and escape spaces 75 on both sides in the left-right direction. The forming space 74 and the escape space 75 are formed not only in the intermediate forming portion 61 but also on the other end of the flattened portion 60 in the axial direction.

  In the range of the intermediate molding portion 61, the molding space 74 is defined by the concave portion 71a in the upper and lower portions in the most axial direction, and is defined by the convex portion 71b in the slight axial range on the other side. Each of the left and right escape spaces 75 communicates with the molding space 74 at the center in the left-right direction on the inner side in the left-right direction, is defined by the arc surface 73 on the outer side in the left-right direction, and is defined by the slope 72 at the upper and lower sides. The arc surface 73 is connected to the other side of the maximum diameter portion 62 on one side, and the diameter of the arc surface 73 is equal to the diameter of the maximum diameter portion 62.

  5A and 5B show the shape of the rubber 14 before and after compression. In FIG. 5A, the rubber 14 has a cylindrical portion 76 and a flange 77 extending slightly outward in the radial direction from the end of the cylindrical portion 76 with the center line aligned. The center hole 78 passes through the cylindrical portion 76 and the flange 77 along the center line of the rubber 14. The rubber 14 has a flange 77 because a general-purpose rubber 14 is used, and the rubber 14 without the flange 77 can also be used. FIG. 5B will be described later in connection with the description of the operation of the connector 10 below.

  Next, the operation of the connector 10 will be described. The connector 10 corresponds to the catheter connector of the present invention, the cap 12 corresponds to the screwing member of the present invention, the rubber 14 corresponds to the elastic member of the present invention, and the throttle portion 43, the slope portion 44 and the cylindrical portion 45 are the main members. The mounting portion 41 corresponds to the instrument connecting portion of the present invention, the maximum diameter portion 62 corresponds to the first through hole portion of the present invention, and the intermediate forming portion 61 corresponds to the second passage of the present invention. It corresponds to a hole portion, and the oblate Heisei portion 60 corresponds to a third hole portion of the present invention.

  When the cap 12 is removed from the main body 13 and the opening on one side of the cylindrical portion 45 is exposed, the rubber 14 is loaded into the maximum diameter portion 62 from the flange 77 side through the exposed opening. . The diameter of the maximum diameter portion 62 is equal to the diameter of the cylindrical portion 76 or the flange 77.

  In the present invention, storing the rubber 14 in the maximum diameter portion 62 in a substantially non-compressed state (loading) means that the outer peripheral portion of the rubber 14 is not compressed radially inward or is compressed. However, the diameter of the central hole 78 of the rubber 14 is equal to or larger than the outer diameter of the catheter 11 and is in a compressed state that does not hinder the insertion operation of the catheter 11 into the central hole 78. .

  When the diameter of the maximum diameter portion 62 is equal to the diameter of the cylindrical portion 76 or the flange 77, the rubber 14 is present when the rubber 14 exists in the maximum diameter portion 62 without being compressed in the axial direction by the protrusion 24. Is naturally uncompressed in the radial direction. When the diameter of the maximum diameter portion 62 is made equal to the diameter of the cylindrical portion 76, the rubber 14 is not compressed in the axial direction by the projection 24, but is present in the maximum diameter portion 62. In this case, the difference in diameter between the flange 77 and the cylindrical portion 76 is compressed in the radial direction. However, since the difference is slight, the rubber 14 is substantially in an uncompressed state in the radial direction, the central hole 78 is not crushed, and the catheter 11 can pass through the central hole 78.

  Before the catheter 11 is inserted into the connector 10, the cap 12 is rotated in the loosening direction with respect to the main body 13, and the end of the outer cylindrical portion 21 is sufficiently separated from the end of the fin 50 to one side. (Fig. 1). In this state, the flange 77 as the other end portion of the rubber 14 remains in the maximum diameter portion 62 and does not enter the intermediate molding portion 61.

  The operator inserts the proximal end side of the catheter 11 from the section 35 into the connector 10 with the cap 12 sufficiently loosened. The catheter 11 is guided by the taper of the sections 35 and 36 and proceeds to the other side, and passes through the center hole 78 of the rubber 14, the intermediate molding part 61, the oblate hemisphere part 60, and the taper part 59, and the fitting part. 58 abuts on the step on the other end.

  In FIGS. 1 and 2, the catheter 11 is inserted from the section 35 of the through hole 34 of the cap 12 and the end is pushed to the other end of the fitting portion 58 prior to the start of tightening of the cap 12. At that time, the end of the catheter 11 does not have a step portion at the boundary between the flattened portion 60 and the tapered portion 59, and thus passes through the boundary without any trouble.

  Next, the operator tightens the cap 12 against the main body 13 while pushing the catheter 11 so that the catheter 11 pushed into the connector 10 is not returned from the connector 10. As a result, the female screw portion 29 and the male screw portion 46 rotate relative to each other, and the protrusion 24 of the cap 12 advances from the one side to the other side within the maximum diameter portion 62, and the rubber 14 moves toward the intermediate molding portion 61. Push in.

  In this way, the flange 77 of the rubber 14 starts to enter the intermediate molding portion 61. Since the rubber 14 is elastically deformable, the entry portion of the rubber 14 that has entered the intermediate molding portion 61 is deformed into a shape equal to the shape of the intermediate molding portion 61. The rubber 14 is also pushed between the projection 24 and the inner peripheral surface of the cylindrical portion 45 at one end portion (FIG. 2).

  The operator tightens the cap 12 until the other end of the outer cylindrical portion 21 comes into contact with one end of the fin 50 in the axial direction. At the time when the tightening is completed (FIG. 2), the other end of the rubber 14 reaches the other end of the oblate hemiform 60 through the intermediate molded part 61. The shape of the rubber 14 in this state is shown in FIG.

  In FIG. 5B, the distal end portion (the distal end portion in the entry direction) of the rubber 14 includes a flat shape portion 85 on the distal end side and a transition shape portion on the proximal end side in accordance with the shapes of the flattened portion 60 and the intermediate molding portion 61. And 86. The flat shape portion 85 includes a flat cross-sectional portion 87a in the center range in the left-right direction and a relief portion 87b in the range in both ends in the left-right direction. The transition shape portion 86 includes a curved inclined portion 88a having a central range in the left-right direction and a relief portion 88b having both end ranges in the left-right direction. The upper and lower surfaces of the curved inclined portion 88a further include a convex surface 90 on one side in the axial direction and a concave surface 91 on the other side in the axial direction.

  In the flat shape portion 85, the upper and lower surfaces of the flat cross-section portion 87a are formed surfaces by the flat surface 70 (FIGS. 1 and 2), and the surfaces of the escape portions 87b are formed by the inclined surface 72 and the arc surface 73 (FIG. 3). is there. The horizontal dimension of the upper and lower surfaces of the flat cross section 87a increases toward the tip side of the rubber 14, that is, toward the other side in the axial direction.

  In the transition shape portion 86, the convex surface 90 and the concave surface 91 in the curved inclined portion 88a are molding surfaces formed by the concave surface portion 71a and the convex surface portion 71b of the intermediate molding portion 61, and the surface of the relief portion 88b is the slope 72 and the arc surface 73 (FIG. 3). ). The lateral width of the curved inclined portion 88a is substantially equal regardless of the axial position. The lateral widths of the escape portions 87b and 88b are increased toward the tip end side of the rubber 14, that is, toward the other side in the axial direction, similarly to the lateral dimension of the upper and lower surfaces of the flat cross section 87a.

  As described above, the compression-side curved surface 71 of the intermediate molding portion 61 is composed of the concave surface portion 71a on the one axial side and the convex surface portion 71b on the other axial side. The concave surface portion 71 a has a large R with the center in the through hole 54, specifically, the center in the cavity of the intermediate molding portion 61 in the through hole 54. On the other hand, the convex surface portion 71 b has a center R outside the through-hole 54, specifically, a center within the wall portion of the body 13 as the outside of the cavity of the intermediate molding portion 61 in the through-hole 54.

  The end on the entry side of the rubber 14 has a 90 ° angle in the longitudinal section at the start of entry, but the entry portion is formed by the concave portion 71a as the first step with the entry into the intermediate molding portion 61. The curved inclined portion 88a that is gently rounded is deformed into a convex surface 90. As the next second stage, the approach portion is deformed into the concave surface 91 of the curved inclined portion 88a that is greatly compressed by the convex surface portion 71b to the short side dimension on one side of the oblate hemiform portion 60 and widened in the left-right width. Then, it enters the oblate hemispherical portion 60 in the state of the concave surface 91, and is formed into the oblong shape portion 85 in the oblate square shape portion 60.

  When the tightening of the cap 12 is completed, the catheter 11 is subjected to vertical clamping pressure from the flat cross-sectional portion 87a of the flat shape portion 85 of the rubber 14. Therefore, the clamping range of the catheter 11 by the rubber 14 is the dimension L1 in the axial direction as shown in FIG. 5B, and L1 is compared with the conventional dimension L2 (FIG. 7B). It has increased sufficiently.

  In this way, the clamping range related to the catheter 11 from the rubber 14 can be sufficiently taken in the axial direction, so that the fixation of the catheter 11 is improved while reducing the maximum clamping pressure, that is, avoiding the crushing of the catheter 11. can do.

  Further, since the central hole 78 of the rubber 14 is compressed over a long range in the long side direction of the flat cross section at the flat cross section 87a, the pressure-clamping area of the catheter 11 by the rubber 14 increases. This also improves the fixability of the catheter 11 while reducing the maximum pinching pressure and avoiding the catheter 11 from being crushed.

  When releasing the fixation of the catheter 11, the operator rotates the cap 12 relative to the main body 13 in the direction opposite to that when the cap 12 is tightened. Thereby, the cap 12 rotates in a direction in which the tightening to the main body 13 is loosened, and the outer cylindrical portion 21 moves away from the fin 50 and moves to one side in the axial direction. Along with this, the inner cylindrical portion 22 also moves to one side, so that the pushing force of the rubber 14 by the protruding portion 24 decreases and eventually disappears.

  The transition shape portion 86 that is an entry portion of the rubber 14 into the intermediate molding portion 61 has a compression-side curved surface 71 that is inclined from one side to the other side toward the center line of the main body 13 due to its shape restoring force. Receives a reaction force from one side to the other. 3 and 4, the upper and lower surfaces of the escape space 75 are slopes 72, and the rubber 14 is located on one side from the other side in the axial direction with respect to the slope 72 in the escape portions 87b and 88b. The reaction force toward the direction is received.

  The rubber 14 automatically moves in the axial direction from the other side to the one side when the push-in is released from the protrusion 24 due to the reaction force due to the elastic shape restoring force. The intermediate molded portion 61 is led out to the maximum diameter portion 62. Thereby, the diameter of the center hole 78 returns to the original, and the catheter 11 is released from the pressure pinched by the rubber 14. Thereafter, the operator pulls out the catheter 11 from the connector 10.

  Although the present invention has been described with respect to the embodiments, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the gist of the present invention.

  For example, the cap 12 may be structured to be screwed to the inner periphery of the main body 13 instead of the outer periphery of the main body 13. In addition, as an infusion device, an infusion line other than a syringe can be employed.

DESCRIPTION OF SYMBOLS 10 ... Connector (catheter connector), 11 ... Catheter, 12 ... Cap (screwing member), 13 ... Main body, 14 ... Rubber (elastic member), 29 ... Female thread part, 41 ... Mounting part (appliance connecting part), 43 ... throttle part (cylinder part), 44 ... slope part (cylinder part), 45 ... cylindrical part (cylinder part), 46 ... male screw , 60 ... oblate shape (third through-hole part), 61 ... intermediate molded part (second through-hole part), 62 ... maximum diameter part (first through-hole part), 71b -Convex part, 72 ... slope, 75 ... escape space, 78 ... center hole.

Claims (4)

A cylindrical portion and an instrument connecting portion are arranged on one end side and the other end side in the axial direction and are connected to each other, and the cylindrical portion accommodates an end portion of a catheter inserted from an opening provided on one end side. The instrument connecting portion is a connector body to which an infusion instrument is connected from the other end side,
A cylindrical elastic member that is housed in the cylindrical portion and through which the end portion of the catheter penetrates;
A screwing member for moving the elastic member to the other end side by screwing into the tube portion from the one end side of the tube portion and tightening toward the other end side of the tube portion;
The cylindrical portion is
A first through hole portion for storing the elastic member in a substantially uncompressed state;
A second passage which is provided continuously with the other end side of the first through hole portion and guides the elastic member entering from the first through hole portion on one end side toward the other end side while gradually compressing the elastic member into a flat cross section. The hole part,
The elastic member that is connected to the other end side of the second through-hole portion and enters from the second through-hole portion on one end side is held in a compressed state with a flat cross section toward the other end side by a predetermined length. A catheter connector having a third through hole portion for guiding. The catheter connector of claim 1,
The catheter connector, wherein the second through hole portion and the third through hole portion have relief space portions of the entry portion at both ends in the long side direction of the flat cross section of the entry portion of the elastic member. The catheter connector according to claim 2,
The escape space portions of the second through hole portion and the third through hole portion are defined by slopes that gradually reduce the size of the escape space portion in the short side direction of the flat cross section from one axial end side to the other end side. A catheter connector characterized by being formed. The catheter connector according to claim 3.
In the second hole portion, the catheter connector face of the compression direction sides definitive the other end, characterized in that it is formed in an arc centered on the cavity outside of the second hole portion.

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