JP2014124302A - Catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter which, when a guide wire with a bent tip is inserted from an opening of a proximal end of a hub of the catheter, enables the tip of the guide wire to be smoothly inserted into a lumen of a shaft of the catheter.SOLUTION: A hub 14 of a catheter 10 has an elastically deformable deformation part to narrow a hub lumen 24 when it is pressed from the outside. When the hub 14 is elastically deformed to narrow the hub lumen 24 with the bent tip of a guide wire disposed in the hub lumen 24, the bent tip of the guide wire is elastically deformed in the direction of returning to be linear.

Description

  The present invention relates to a catheter.

  2. Description of the Related Art Conventionally, it has been widely performed to introduce a catheter into a living organ such as a blood vessel to inspect and treat a lesioned part (for example, a stenosis) in the living organ. This type of catheter generally has a long shaft constituting a catheter body and a hub connected to a proximal end portion of the shaft (see, for example, Patent Document 1 below).

  In using such a catheter, in order to reach the distal end of the catheter to a target site in the living body, it is necessary to advance the shaft selectively in a complexly branched blood vessel or body cavity. For this reason, usually, a guide wire is inserted through the lumen of the catheter, and the catheter is caused to travel along the guide wire in the blood vessel or body cavity with the tip of the guide wire preceding the tip of the catheter. .

US Pat. No. 6,355,027

  By the way, in order to select a blood vessel and control the direction of the distal end of a catheter, the guide wire may be used by bending one end or a plurality of portions of the distal end in advance (with an angle). When the guide wire having the angled tip is inserted into the catheter from the proximal end opening of the catheter hub, the most distal end of the guide wire comes into contact with a part of the inner peripheral surface of the hub. The guide wire advances with respect to the hub while the other part of the guide wire contacts the inner peripheral surface of the hub opposite to the hub. In this case, since the conventional hub is provided with a Luer taper in which the inner diameter decreases at a constant rate toward the distal end, the inner diameter becomes smaller toward the distal end, and the guide wire and the hub are reduced as the inner diameter is reduced. The frictional resistance with the peripheral surface is also increased. For this reason, the movement of the guide wire is prevented on the inner peripheral surface of the hub, and it may be difficult to move the guide wire further to the distal end side.

  The present invention has been made in consideration of such problems. When a guide wire having a bent tip is inserted from the proximal end opening of the hub, the tip of the guide wire is smoothly inserted into the lumen of the shaft. An object of the present invention is to provide a catheter that can be used.

  To achieve the above object, the present invention provides a shaft constituting a catheter body, a hub lumen forming portion that is provided at a proximal end of the shaft and forms a hub lumen that communicates with the lumen of the shaft, And a hub having a proximal end opening, wherein the hub has a deformable portion that can be elastically deformed so that the hub lumen is narrowed when pressed from outside. . In this case, when the hub is elastically deformed so that the hub lumen is narrowed in a state where the bent distal end portion of the long medical device is disposed in the hub lumen, the direction in which the distal end portion returns to a straight line It may be elastically deformed.

  According to the above configuration, when a long medical device (for example, a guide wire) having a bent distal end portion is inserted from the proximal end side of the hub, the distal end portion of the long medical device is inserted into the hub lumen forming portion. In this state, when the hub is pressed from the outside, the inner peripheral surface of the hub presses the distal end portion of the long medical device, so that the distal end portion is deformed in a direction to return to a linear shape. Is moved from the hub lumen into the shaft. When the distal end of the long medical device is deformed in this way and reaches the shaft, the contact angle between the most advanced portion and the inner peripheral surface of the shaft is small, and the frictional resistance is small. By pushing in, the long medical device can be easily moved in the distal direction. Therefore, the long medical device can be smoothly inserted into the shaft.

  In the catheter, the hub lumen forming portion receives at least a part of the distal end portion when the distal end portion of the long medical device is inserted into the hub lumen forming portion, and the tip end portion surrounds the hub lumen forming portion. You may have a part which functions as a control guide part which controls moving to a direction.

  According to said structure, even if it presses a hub from the outer side and is elastically deformed, the front-end | tip part of a long medical device can be prevented from shifting | deviating to the circumferential direction by the effect | action of a control guide part. Accordingly, the distal end portion of the long medical device can be effectively deformed in the direction of returning to the linear shape on the inner surface of the hub lumen forming portion.

  In the above-described catheter, the hub lumen forming portion includes four groove portions radially provided in four directions toward the outside of the hub and extending along the axial direction of the hub. When the distal end portion of the long medical device is inserted into the forming portion, of the four groove portions, two groove portions with which the distal end portion abuts may function as the regulation guide portion.

  According to the above configuration, when the hub is pressed from the outside, the two groove portions that receive the distal end portion of the long medical device function as the regulation guide portion, so that the distal end portion of the long medical device is Shifting in the direction is effectively prevented. In this case, since the hub is easily deformed at the remaining two groove portions, the hub can be easily pressed.

  In the above catheter, at least two of the four groove portions facing each other may be formed in a V shape.

  According to said structure, when the front-end | tip part which the long medical device bent in two groove parts formed in V shape is arrange | positioned from the both sides by the wall near the vertex of V-shape. Therefore, when the hub is pressed from the outside, the distal end portion of the long medical device is reliably prevented from shifting in the circumferential direction of the hub. Also, when the hub is pressed and elastically deformed from the direction intersecting the separating direction of the two groove portions formed in the V shape, the hub deforms at the location of the two groove portions formed in the V shape. Therefore, the pressing operation of the hub can be performed more easily.

  In the above catheter, the portion functioning as the regulation guide portion may be provided at a location facing each other in the hub lumen forming portion.

  According to the above configuration, even if the hub is pressed from the outside to be elastically deformed, the action of the regulation guide portions provided at the mutually opposing locations in the hub lumen forming portion causes the distal end portion of the long medical device. It is possible to prevent both the most advanced part and the bent part from shifting in the circumferential direction. Accordingly, the distal end portion of the long medical device can be reliably deformed in the direction of returning to the linear shape on the inner surface of the hub lumen forming portion.

  In the above catheter, the hub lumen forming portion includes a Luer taper formed over a predetermined range in an axial direction from the proximal end opening, and a distal end opening provided at a distal end side with respect to the Luer taper. The deformable portion as a delivery portion facing the opening, and the portion corresponding to the delivery portion of the hub is pressed from the outside while the distal end portion of the long medical device is inserted into the delivery portion. When operated, the distal surface of the delivery part may be deformed in a direction to return to a straight line by pressing the distal part of the long medical device.

  According to said structure, the delivery part is provided as a part which deform | transforms the bending front-end | tip part of a long medical device in the hub lumen | bore formation part in the front end side rather than a luer taper, ie, the position near the base end of a shaft. Therefore, the deformed tip can be quickly moved into the shaft. In addition, since a luer taper is provided on the proximal end side of the hub lumen forming portion, both the function of deforming the bent distal end portion of the long medical device and the function of connecting other medical devices (syringe, etc.) The hub can be suitably held.

  In the above catheter, the delivery unit includes a magnifying taper portion that extends from the tip of the luer taper and has a lumen that expands in the tip direction, and a lumen that is provided on the tip side of the magnifying taper portion and that has a lumen in the tip direction. You may have a reduction taper part to reduce.

  According to the above configuration, when a long medical device having a bent distal end portion is inserted from the proximal end side of the hub, when the leading edge portion of the long medical device reaches the enlarged taper portion, the leading edge portion is The reaction force from the inner peripheral surface of the hub is reduced, the contact angle between the leading edge and the enlarged taper portion is reduced, and the frictional resistance between the long medical device and the hub inner peripheral surface at the enlarged taper portion is reduced. To do. Thereby, operation which arrange | positions the front-end | tip part of a elongate medical device in a delivery part can be performed smoothly.

  According to the catheter of the present invention, the distal end portion of the guide wire can be smoothly inserted into the lumen of the shaft when the guide wire having the bent distal end portion is inserted from the proximal end opening of the hub.

1 is a partially omitted side view of a catheter according to an embodiment of the present invention. FIG. 2 is a partially omitted longitudinal sectional view of the hub of the catheter shown in FIG. 1. FIG. 3 is a perspective view showing a cross section along the line III-III in FIG. 2. 4A is a cross-sectional view taken along line IVA-IVA in FIG. 2, and FIG. 4B is a cross-sectional view of the hub when pressed in the X direction in the drawing. FIG. 5A is a first diagram illustrating an operation of inserting a guide wire from the proximal end side of the hub, and FIG. 5B is a second diagram illustrating an operation of inserting the guide wire from the proximal end side of the hub. FIG. 5C is a third diagram illustrating the operation of inserting the guide wire from the proximal end side of the hub. 6A is a cross-sectional view taken along line VIA-VIA in FIG. 5A, and FIG. 6B is a cross-sectional view taken along line VIB-VIB in FIG. 5A. 7A is a cross-sectional view of a hub according to a first modification, FIG. 7B is a cross-sectional view of a hub according to a second modification, and FIG. 7C is a cross-section of a hub according to a third modification. FIG. 7D is a cross-sectional view of a hub according to a fourth modification. FIG. 10 is a partially omitted vertical sectional view of a hub according to a fifth modification.

  Hereinafter, preferred embodiments of the catheter according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a partially omitted side view of a catheter 10 according to an embodiment of the present invention. The catheter 10 is inserted into a blood vessel or body cavity so that the tip reaches a target site, and is used to inject a therapeutic drug or a diagnostic contrast medium. As shown in FIG. 1, the catheter 10 includes a thin and long shaft 12, a hub 14 connected to the proximal end of the shaft 12, and a strain relief 16 provided at a connection portion of the shaft 12 to the hub 14. With.

  In the present embodiment, the guide wire 52 (see FIG. 5A and the like) is exemplified as a long medical device inserted from the proximal end side of the hub 14 of the catheter 10, but the present invention is suitable for inserting the guide wire 52. In addition, it is also suitable for inserting other long medical devices (for example, a catheter having a smaller diameter shaft).

  The shaft 12 constitutes a catheter body that is inserted into a living body lumen such as a blood vessel, and has a flexibility in which a lumen 13 (see also FIG. 2) communicating from the distal end to the proximal end is formed. It is a long and thin tubular member. The length of the shaft 12 is, for example, about 500 mm to 2000 mm, and preferably about 1000 mm to 1500 mm.

  The outer diameter of the shaft 12 is, for example, about 0.3 mm to 3 mm, preferably about 0.4 mm to 2 mm. The inner diameter of the shaft 12 is, for example, about 0.2 mm to 2.5 mm, preferably about 0.3 mm to 1.8 mm. The outer diameter and inner diameter of the shaft 12 may be smaller toward the distal end side. The most distal portion of the shaft 12 may have a taper.

  An X-ray opaque marker (contrast marker) 18 is fixed to the outer peripheral surface in the vicinity of the most distal end portion of the shaft 12. The radiopaque marker 18 is formed of a material having radiopacity that is made of gold, platinum, or the like, so that the distal end position of the catheter 10 can be viewed in vivo under radiography. Is.

  The hub 14 is a portion that the user of the catheter 10 grasps with fingers, and is configured by a hollow structure member that holds the proximal end of the shaft 12 at the distal end, and other devices such as a syringe are connected to the proximal end. It is possible. The hub 14 has moderate rigidity as long as such a function can be achieved. On the other hand, when pressed from the outside with a finger or the like, the pressed portion can be elastically deformed inward, and When the pressure is released, it has an appropriate elasticity (flexibility) to return to its original shape by an elastic restoring force. Therefore, the hub 14 can be elastically deformed so that the hub lumen 24 (see FIG. 2) is narrowed when pressed from the outside.

  Examples of such materials having moderate rigidity and elasticity include polyolefins such as polypropylene, polyethylene, and ethylene-vinyl acetate copolymer, polyvinyl chloride, polyamide, polyethylene terephthalate (PET), and polybutylene terephthalate (PBT). Polyester, polyurethane, polyvinyl chloride, polystyrene resin, polyimide, polycarbonate, acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylic resin, polymethyl methacrylate (PMMA), polyacetal (PA), polyarylate, polyoxy Methylene (POM), high-strength polyvinyl alcohol, polyvinylidene fluoride (PVDF), polytetrafluoroethylene, ethylene-vinyl acetate saponified product (EVOH), polysulfone, Various flexible resins such as polyethersulfone, polyetherketone, polyphenylene oxide, polyphenylene sulfide, ethylene-tetrafluoroethylene copolymer and other flexible resins, polyamide elastomer, polyester elastomer, polyurethane elastomer, polystyrene elastomer, fluorine Polymer materials such as various elastomers such as elastomers, silicone rubber and latex rubber, polymer alloys containing any of these, non-metallic materials such as carbon fiber and glass fiber, or a combination of two or more of these A thing may be used.

  The strain relief 16 is for preventing bending (kinking) at the connection portion of the shaft 12 to the hub 14. For example, the strain relief 16 is formed of a resin having moderate flexibility and rigidity formed in a tapered tube shape. It is a member. The strain relief 16 can be made of a material similar to that of the hub 14.

  Next, a specific configuration of the hub 14 will be described. FIG. 2 is a partially omitted vertical sectional view of the hub 14. As shown in FIG. 2, the hub 14 includes a hollow body portion 20 and a plurality (two in the illustrated example) of ribs 22 protruding from the outer surface of the body portion 20. The body portion 20 is provided at the base end of the hub 14 and an inner peripheral portion 34 (hereinafter referred to as “hub lumen forming portion 34”) that forms a hub lumen 24 that communicates with the lumen 13 of the shaft 12. A proximal end opening 26.

  Further, a shaft holding portion 28 having a cylindrical inner surface is provided on the distal end side of the hub 14. The base end portion 32 of the shaft 12 is held and fixed to the shaft holding portion 28. A hub lumen forming portion 34 is provided on the proximal side of the shaft holding portion 28 via a step portion 30 having a diameter reduced with respect to the shaft holding portion 28.

  The inner diameter on the proximal end side of the inner peripheral portion 36 that forms the lumen 13 of the shaft 12 is larger than the inner diameter of the distal end portion of the hub lumen forming portion 34 (the diameter of the distal end opening 43a). 30 is formed. The base end portion 32 of the shaft 12 is in contact with the stepped portion 30.

  In the present embodiment, the hub 14 and the shaft 12 are manufactured separately, and the proximal end portion 32 of the shaft 12 is inserted into the distal end (shaft holding portion 28) of the hub 14, and adhesion, thermal fusion, or the like is performed. These are joined by appropriate joining means. The hub 14 may be provided at the rear end of the shaft 12 by insert molding.

  As shown in FIG. 2, the hub lumen forming portion 34 includes a luer taper 40 formed over a predetermined range (length L1) in the axis a direction from the proximal end opening 26 of the hub 14, and a distal end of the luer taper 40. And a delivery portion 42 (deformation portion) that is provided on the distal end side of the luer taper 40 and that has a distal end opening 43a facing the proximal end opening of the shaft 12.

  The luer taper 40 has a distal end of the guide wire 52 formed by an inner peripheral surface that is reduced in diameter toward the distal end when a guide wire 52 (see FIG. 5A or the like) having a bent distal end portion 54 is inserted from the proximal end side of the hub 14. While guiding the portion 54 (see FIG. 5A and the like) toward the center side of the hub 14, the tip portion 54 is guided in a direction to return to a linear shape. The length L1 along the axis a of the luer taper 40 is, for example, about 10 mm to 40 mm, and preferably about 20 mm to 35 mm. The inclination angle of the luer taper 40 with respect to the axis a is 3 °.

  The delivery unit 42 receives the distal end portion 54 of the guide wire 52 from the luer taper 40 and inserts the distal end portion 54 of the shaft 12 when the guide wire 52 with the distal end portion 54 bent is inserted from the proximal end side of the hub 14. This is the part that guides to the lumen 13. More specifically, the delivery unit 42 is configured so that the hub 14 is in a state where the bent distal end portion 54 of the guide wire 52 (see FIG. 5A or the like) is inserted into the hub lumen 24 through the proximal end opening 26. When the hub 14 is pressed from the outside, the distal end portion 54 of the guide wire 52 is pressed and deformed in accordance with the elastic deformation of the hub 14, thereby causing the distal end portion 56 of the guide wire 52 to enter the shaft 12 from the hub lumen 24. And has the function of moving.

  The length L2 along the direction of the axis a of the delivery part 42 is, for example, about 10 mm to 30 mm, preferably about 15 mm to 25 mm. The length L2 may be longer or shorter than the length L1.

  FIG. 3 is a perspective view showing a cross section along the line III-III in FIG. 2. 4A is a cross-sectional view taken along line IVA-IVA in FIG. As shown in FIGS. 3 and 4A, the delivery part 42 is provided in four directions radially toward the outer side (radially outer side) of the hub 14 and extends along the axial direction of the hub 14. Have Of the four groove portions 44, two groove portions 44a and 44c face each other, and the remaining two groove portions 44b and 44d face each other. In the present embodiment, specifically, the four groove portions 44 are provided at equiangular intervals (90 ° intervals) around the axis of the hub 14.

  The hub lumen forming part 34 receives at least a part of the tip part 54 when the tip part 54 of the guide wire 52 is inserted into the hub lumen forming part 34, and the tip part 54 moves in the circumferential direction. It has a part which functions as a regulation guide part which regulates (displacement). Specifically, in the present embodiment, when the distal end portion 54 of the guide wire 52 is inserted into the hub lumen forming portion 34, of the four groove portions 44, the two groove portions 44 (groove portions 44a) with which the distal end portion 54 abuts. 44c or groove portions 44b, 44d) are portions that function as restriction guide portions.

  As understood from FIG. 3 and FIG. 4A, each groove portion 44 is configured as a V-shaped groove with a groove width decreasing toward the radially outer side of the hub 14 and having a point at the radially outer end. Has been. In other words, the delivery part 42 (the lumen of the delivery part 42) is formed in a star shape having four apexes (protrusions).

  In the hub 14 including the delivery portion 42 configured as described above, as shown in FIG. 4B, for example, the hub 14 is pressed in the X direction from the outside of the hub 14 at a location corresponding to the delivery portion 42 with respect to the axial direction of the hub 14. Then, the hub 14 is elastically deformed so as to collapse along the X direction. In this case, of the four groove portions 44, the two groove portions 44a and 44c facing each other on the side corresponding to the pressed portion are deformed so as to open the groove shape while being displaced so as to approach each other, and the remaining two groove portions 44b. 44d are deformed in the direction of closing the groove shape.

  4B, when pressed in the Y direction from the outside of the hub 14, the hub 14 is elastically deformed so as to be crushed along the Y direction. In this case, of the four groove portions 44, the two groove portions 44b and 44d facing each other on the side corresponding to the pressed portion are deformed so as to open the groove shape while being displaced so as to approach each other, and the remaining two groove portions 44a. , 44c are deformed in the direction of closing the groove shape.

  As shown in FIG. 2 and FIG. 3, in this embodiment, the delivery part 42 has an enlarged taper part 46 whose lumen expands in the distal direction, and a distal direction connected to the distal end of the enlarged taper part 46. It has a reduction taper part 48 in which the lumen is reduced. Accordingly, the delivery portion 42 has a larger inner cavity than the distal end opening 43a and the proximal end opening 43b between the distal end opening 43a and the proximal end opening 43b, and a convex intermediate portion radially outward in the longitudinal section of the hub 14. An enlargement unit 50 is provided.

  The length L3 along the direction of the axis a of the enlarged taper portion 46 is, for example, about 3 mm to 10 mm, preferably about 3 mm to 5 mm. The inclination angle of the enlarged taper portion 46 with respect to the axis a is, for example, about −5 ° to 0 °, and preferably about −3 ° to 0 °.

  The length L4 along the axis a direction of the reduced taper portion 48 is, for example, about 6 mm to 20 mm, and preferably about 10 mm to 15 mm. The inclination angle of the reduction taper portion 48 with respect to the axis line a may be the same as or different from the inclination angle of the luer taper 40 with respect to the axis line a, for example, about 3 ° to 15 °, preferably about 3 ° to 10 °. is there.

  The catheter 10 according to the present embodiment is basically configured as described above. Hereinafter, with reference to mainly FIGS. 5A to 5C, an example of a long medical device will be described with respect to the action and effect of the catheter 10. The guide wire 52 will be described as an example. In this example, in particular, an operation for inserting the guide wire 52 having the distal end portion 54 bent from the proximal end side (the proximal end opening portion 26) of the hub 14 will be described.

  5A to 5C, the distal end portion 54 of the guide wire 52 is bent so as to have three bent portions 57, 58, 59, but the present invention is provided when one or two bent portions are provided. Is also applicable. The leading end portion 56 of the guide wire 52 is formed in a round shape.

  When the guide wire 52 with the distal end portion 54 bent is started to be inserted from the proximal end side of the hub 14, first, the most distal portion 56 of the guide wire 52 abuts a part of the inner peripheral surface of the luer taper 40, and the guide wire The other part (bent part 58) of 52 is in contact with the other part of the inner peripheral surface of the luer taper 40 (the part on the opposite side to the part where the most distal end part 56 comes into contact and the base end side of the part).

  Then, by further pushing the guide wire 52 in the distal direction, as shown in FIG. 5A, the distal end portion 54 of the guide wire 52 is introduced into the delivery portion 42 via the luer taper 40, and at least of the distal end portion 54. The most distal portion 56 and the bent portion 58 are disposed in the delivery portion 42. At this time, when the bent portion 58 of the guide wire 52 is disposed in the enlarged taper portion 46 and the distal end portion 56 is disposed in the vicinity of the distal end opening 43a of the delivery portion 42, the distal end portion 56 is moved into the shaft 12 in the subsequent operation. It becomes easy to move to.

  Thus, by introducing the distal end portion 54 of the guide wire 52 into the delivery portion 42, the distal end portion 54 is disposed in the groove portions 44 facing each other. Specifically, as shown in FIG. 6A, which is a cross-sectional view taken along line VIA-VIA in FIG. 5A, the most distal portion 56 of the guide wire 52 is disposed in the groove 44 c, and VIB-VIB in FIG. 5A. As shown in FIG. 6B, which is a cross-sectional view taken along the line, the bent portion 58 of the guide wire 52 is placed in the groove 44 a.

  Next, as shown in FIG. 5B, a portion of the hub 14 where the delivery portion 42 is provided, corresponding to the grooves 44 a and 44 c where the distal end portion 54 of the guide wire 52 is disposed (upper side in FIG. 5B). And the lower side) are pressed from the outside, the hub 14 is elastically deformed so that the inner cavity is crushed at the delivery portion 42, and the two grooves 44a and 44c are displaced in a direction approaching each other. At this time, the most distal portion 56 and the bent portion 58 are pushed by the inner surface of the hub 14 (the inner surface of the delivery portion 42) that is displaced inward, so that the most distal portion 56 and the bent portion 58 are inward (axis line). Displacement in a direction approaching a).

  In this case, the distal end portion 54 (particularly, the most distal end portion 56 and the bent portion 58) of the guide wire 52 is disposed in the groove portions 44a and 44c, and these groove portions 44a and 44c act as restriction guide portions. When the hub 14 is elastically deformed so that the cavity is collapsed, the distal end portion 54 of the guide wire 52 does not shift in the circumferential direction. Therefore, the distal end portion 56 and the bent portion 58 are reliably displaced inward by the inner surface of the delivery portion 42.

  As the hub 14 is elastically deformed, the distal end portion 56 and the bent portion 58 are displaced inward, and as a result, the bent distal end portion 54 of the guide wire 52 is deformed in a direction returning to a straight line. In the process of this deformation, the most distal portion 56 of the guide wire 52 moves in the distal direction while sliding on the inner wall of the groove portion 44. Thereby, as shown in FIG. 5B, the distal end portion 56 moves from the hub lumen 24 into the lumen of the shaft 12. In this embodiment, since the bent portion 58 is supported by the enlarged taper portion 46 that is inclined so as to expand toward the distal direction, the guide wire 52 moves in the proximal direction along with the elastic deformation of the hub 14. There is nothing.

  In a state where the most advanced portion 56 has reached the shaft 12, the contact angle between the most advanced portion 56 and the inner peripheral surface of the shaft 12 is small, and the frictional resistance is small. Thus, if the frictional resistance between the most distal portion 56 and the inner peripheral surface of the hub 14 is small, the pushing force of the guide wire 52 from the hand side is effectively transmitted to the distal end portion 54 of the guide wire 52. The distal end portion 54 of the guide wire 52 is easy to move in the distal direction. Therefore, as shown in FIG. 5C, the guide wire 52 is pushed further in the distal direction while maintaining the state of being elastically deformed by being pressed from the outside of the hub 14. Can be inserted smoothly.

  As described above, according to the catheter 10 according to the present embodiment, when the guide wire 52 with the distal end portion 54 bent is inserted from the proximal end side of the hub 14, if the hub 14 is pressed from the outside, the hub 14 is pressed. In accordance with the elastic deformation of the guide wire 52, the bent distal end portion 54 of the guide wire 52 is deformed in a direction to return to a straight line, thereby moving the distal end portion 56 of the guide wire 52 from the hub lumen 24 into the shaft 12. It is done. In the state where the most advanced portion 56 has reached the shaft 12, the contact angle between the most advanced portion 56 and the inner peripheral surface of the shaft 12 is small and the frictional resistance is small. It can be inserted into the shaft 12.

  In the case of the present embodiment, the hub lumen forming portion 34 receives at least a part of the tip portion 54 when the tip portion 54 of the guide wire 52 is inserted into the hub lumen forming portion 34 and the tip. It has a part (groove part 44) which functions as a regulation guide part which regulates that part 54 moves to the peripheral direction. According to this configuration, even if the hub 14 is pressed from the outside to be elastically deformed, the distal end portion 54 of the guide wire 52 can be prevented from being displaced in the circumferential direction in the hub 14 by the action of the restriction guide portion. Accordingly, the distal end portion 54 of the guide wire 52 can be effectively deformed in the direction of returning to the linear shape on the inner surface of the hub lumen forming portion 34.

  In particular, in the case of the present embodiment, the portion (groove portion 44) that functions as the regulation guide portion is provided at a location facing each other in the hub lumen forming portion 34, and therefore, the most distal portion 56 in the distal end portion 54 of the guide wire 52. Both of the bent portions 58 can be prevented from shifting in the circumferential direction. Accordingly, the distal end portion 54 of the guide wire 52 can be reliably deformed in the direction of returning to the linear shape on the inner surface of the hub lumen forming portion 34.

  In the present embodiment, four groove portions 44 are provided in the delivery portion 42, but at least one groove portion 44 may be provided. When at least one groove portion 44 is provided, the groove portion 44 functions as a regulation guide portion. Therefore, at least one of the most distal end portion 56 and the bent portion 58 at the distal end portion 54 of the guide wire 52 is circumferential in the hub 14. It can prevent shifting.

  In the present embodiment, of the four groove portions 44, two groove portions 44 face each other, and the remaining two groove portions 44 face each other. According to this configuration, when the hub 14 is pressed from the outside in a state where the bent distal end portion 54 of the guide wire 52 is disposed in the two groove portions 44 facing each other, the two groove portions 44 function as a regulation guide portion. This effectively prevents the distal end portion 54 of the guide wire 52 from shifting in the circumferential direction within the hub 14. In this case, since the hub 14 is easily deformed at the remaining two groove portions 44, the pressing operation of the hub 14 can be easily performed.

  In the case of this embodiment, each of the four groove portions 44 is formed in a V shape. According to this configuration, when the bent distal end portion 54 of the guide wire 52 is disposed in the two V-shaped groove portions 44, the distal end portion 54 is sandwiched from both sides by the wall in the vicinity of the V-shaped apex. Therefore, when the hub 14 is pressed from the outside, the distal end portion 54 of the guide wire 52 is reliably prevented from shifting in the circumferential direction of the hub 14. Further, when the hub 14 is pressed from the outside, the hub 14 is easily elastically deformed at the remaining two groove portions 44 formed in a V shape, so that the hub 14 can be pressed more easily. .

  Of the four groove portions 44, the two groove portions 44 facing each other may have a V shape, and the remaining two groove portions 44 may have other shapes (for example, a U shape). According to this configuration, when the bent distal end portion 54 of the guide wire 52 is disposed in the two V-shaped groove portions 44 facing each other, the distal end portion of the guide wire 52 is pressed when the hub 14 is pressed from the outside. It is possible to suitably prevent 54 from being displaced in the circumferential direction of the hub 14. Also, when the bent tip portion 54 of the guide wire 52 is disposed in the two groove portions 44 that are not V-shaped but opposed to each other, when the hub 14 is pressed from the outside, it is formed in a V-shape. Since the hub 14 is easily elastically deformed at the remaining two groove portions 44, the pressing operation of the hub 14 can be easily performed.

  In the case of the present embodiment, the delivery portion 42 is a portion that deforms the bent distal end portion 54 of the guide wire 52 at a position closer to the distal end side than the luer taper 40 in the hub lumen forming portion 34, that is, closer to the proximal end of the shaft 12. Therefore, the deformed tip 54 can be quickly moved into the shaft 12. Further, since the luer taper 40 is provided on the proximal end side of the hub lumen forming portion 34, both the function of deforming the bent distal end portion 54 of the guide wire 52 and the function of connecting another medical device (syringe or the like) are provided. Can be suitably provided to the hub 14.

  Furthermore, in the case of this embodiment, the delivery part 42 has the expansion taper part 46 and the reduction | restoration taper part 48. FIG. With this configuration, when the guide wire 52 with the distal end portion 54 bent is inserted from the proximal end side of the hub 14, when the distal end portion 56 of the guide wire 52 reaches the enlarged taper portion 46, the distal end portion 56 is While the reaction force from the inner peripheral surface of the hub 14 to be received is reduced, the contact angle between the leading edge portion 56 and the enlarged taper portion 46 is reduced, and the guide wire 52 and the inner peripheral surface of the hub 14 at the enlarged taper portion 46 are reduced. And frictional resistance decreases. Thereby, operation which arrange | positions the front-end | tip part 54 of the guide wire 52 in the delivery part 42 can be performed smoothly.

  In the catheter 10 of the present invention, instead of the hub 14 having the star-shaped delivery part 42, hubs 14a to 14d according to first to fourth modifications as shown in FIGS. 7A to 7D may be employed. .

  FIG. 7A is a cross-sectional view of the hub 14a according to the first modification, and the delivery part 42a (deformation part) of the hub 14a is provided radially in four directions and extends 4 in the axial direction of the hub 14a. It has two groove parts 60 (60a-60d). A cross-shaped lumen 61 is formed by the four grooves 60. The end portion (bottom portion) on the outer side in the radial direction of the hub 14a of each groove portion 60 is curved in a U shape.

  According to the hub 14a configured as described above, when the hub 14a is pressed from the outside in a state where the distal end portion 54 (see FIG. 5A and the like) of the guide wire 52 is inserted into the delivery portion 42a, the lumen 61 is collapsed. As the hub 14a is elastically deformed as described above, the distal end portion 54 is deformed in a direction to return to a straight line, thereby moving the distal end portion 56 of the guide wire 52 from the delivery portion 42a into the shaft 12. be able to.

  Further, the two groove portions 60a and 60c (or groove portions 60b and 60d) are brought close to each other in a state where the bent distal end portion 54 of the guide wire 52 is disposed in the two groove portions 60a and 60c (or groove portions 60b and 60d) facing each other. When the hub 14 is pressed from the outside in the direction, the two groove portions 60a and 60c (or the groove portions 60b and 60d) function as restriction guide portions, so that the distal end portion 54 of the guide wire 52 is in the circumferential direction of the hub 14a. Can be prevented. In this case, since the hub 14a is easily deformed at the remaining two groove portions 60b and 60d (or the groove portions 60a and 60c), the pressing operation of the hub 14a can be easily performed.

  FIG. 7B is a cross-sectional view of the hub 14b according to the second modified example, and the delivery part 42b (deformed part) of the hub 14b has four corner parts 62 (62a to 62d) extending in the axial direction of the hub 14b. ) And form a quadrangular (square in the illustrated example) lumen 43. Even with this configuration, when the hub 14b is pressed from the outside in a state where the distal end portion 54 (see FIG. 5A, etc.) of the guide wire 52 is inserted into the delivery portion 42b, the hub 14b is elastically deformed so that the lumen 43 is crushed. Accordingly, the distal end portion 54 is deformed in a direction to return to a linear shape, whereby the most distal end portion 56 of the guide wire 52 can be moved from the delivery portion 42 b into the shaft 12.

  In addition, in a state where the bent tip portion 54 of the guide wire 52 is disposed at the two corner portions 62a and 62c (or corner portions 62b and 62d) facing each other, the two corner portions 62a and 62c (or corner portions 62b and 62d). ) When the hub 14b is pressed from the outside in a direction to bring them closer to each other, the two corners 62a and 62c (or corners 62b and 62d) function as the regulation guide part, so that the distal end part 54 of the guide wire 52 is It is possible to prevent the hub 14b from shifting in the circumferential direction. In this case, since the hub 14b is easily deformed at the remaining two corners 62b and 62d (or corners 62a and 62c), the hub 14b can be easily pressed.

  FIG. 7C is a cross-sectional view of the hub 14c according to the third modification, and the delivery part 42c (deformation part) of the hub 14c forms an elliptical lumen 64. FIG. Even with this configuration, when the hub 14c is pressed from the outside in a state where the distal end portion 54 (see FIG. 5A, etc.) of the guide wire 52 is inserted into the delivery portion 42c, the hub 14c is elastically deformed so that the inner cavity 64 is crushed. As a result, the distal end portion 54 is deformed in a direction to return to a straight line, whereby the distal end portion 56 of the guide wire 52 can be moved from the delivery portion 42 c into the shaft 12.

  In addition, according to the hub 14c, the hub 14c is pressed from the outside in the direction in which the both end portions 66 are brought closer to each other in a state where the bent distal end portion 54 of the guide wire 52 is disposed at both end portions 66 in the major axis direction of the elliptical shape. When the operation is performed, the two end portions 66 function as a regulation guide portion, whereby the tip end portion 54 of the guide wire 52 can be prevented from being displaced in the circumferential direction of the hub 14c.

  FIG. 7D is a cross-sectional view of the hub 14d according to the fourth modified example, and the delivery part 42d (deformed part) of the hub 14d forms a circular lumen 68. Even with this configuration, when the hub 14d is pressed from the outside in a state where the distal end portion 54 (see FIG. 5A, etc.) of the guide wire 52 is inserted into the delivery portion 42d, the hub 14d is elastically deformed so that the inner cavity 68 is crushed. Accordingly, the distal end portion 54 is deformed in a direction to return to a straight line, and thereby the most distal end portion 56 of the guide wire 52 can be moved from the delivery portion 42 d into the shaft 12.

  In the catheter 10 described above, instead of the hub 14, a hub 14e according to a fifth modification shown in FIG. In the hub 14 shown in FIG. 2 and the like, the proximal end portion of the delivery portion 42 is configured by the enlarged taper portion 46. However, in the hub 14e shown in FIG. 8, the proximal end side of the delivery portion 42e (deformation portion). Is constituted by a straight portion 70 having a constant size along the direction of the axis a. Also with this configuration, the hub 14e with the distal end portion 54 (see FIG. 5A, etc.) of the guide wire 52 inserted into the hub lumen forming portion 34, like the catheter 10 having the hub 14 shown in FIG. When the button is pressed from the outside, the distal end portion 54 is deformed in a direction to return to a straight line shape, whereby the most distal end portion 56 of the guide wire 52 can be moved from the hub lumen 24 into the shaft 12.

  In the above description, the present invention has been described with reference to preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Yes.

DESCRIPTION OF SYMBOLS 10 ... Catheter 12 ... Shaft 14, 14a-14e ... Hub 24 ... Hub lumen | bore 26 ... Base end opening part 30 ... Step part 34 ... Hub lumen | bore formation part 40 ... Luer taper 42, 42a-42e ... Delivery part (deformation part)
44, 44a to 44d, 60, 60a to 60d ... groove 46 ... enlarged taper 48 ... reduced taper

Claims (8)

A shaft constituting the catheter body;
A hub provided at a proximal end of the shaft and having a hub lumen forming portion that forms a hub lumen communicating with the lumen of the shaft; and a proximal end opening;
A catheter comprising:
The hub has a deformable portion that can be elastically deformed so that the hub lumen is narrowed when pressed from outside.
A catheter characterized by that. The catheter of claim 1,
When the hub is elastically deformed so that the hub lumen is narrowed in a state where the bent distal end portion of the long medical device is disposed in the hub lumen, the distal end portion is elastically deformed in a direction to return to a linear shape. Let
A catheter characterized by that. The catheter of claim 2,
The hub lumen forming portion receives at least a part of the tip portion when the tip portion of the long medical device is inserted into the hub lumen forming portion, and the tip portion moves in the circumferential direction. Having a portion that functions as a regulation guide for regulating
A catheter characterized by that. The catheter of claim 3,
The hub lumen forming portion has four grooves radially provided in four directions toward the outside of the hub and extending along the axial direction of the hub,
When the distal end portion of the long medical device is inserted into the hub lumen forming portion, of the four groove portions, two groove portions with which the distal end portion abuts function as the regulation guide portion,
A catheter characterized by that. The catheter of claim 4,
Of the four groove portions, at least each of the two groove portions facing each other is formed in a V shape.
A catheter characterized by that. The catheter of claim 3,
The portion functioning as the regulation guide portion is provided at a location facing each other in the hub lumen forming portion.
A catheter characterized by that. The catheter according to any one of claims 2 to 6,
The hub lumen forming portion includes a Luer taper formed in a predetermined range in the axial direction from the proximal end opening, and a delivery portion provided at a distal end side with respect to the Luer taper so that the distal end opening faces the proximal end opening of the shaft. And having the deformed portion as
In a state where the distal end portion of the long medical device is inserted into the delivery portion, when the portion corresponding to the delivery portion of the hub is pressed from the outside, the inner side surface of the delivery portion is the long portion. By pressing the distal end portion of the medical device, the distal end portion is deformed in a direction to return to a linear shape.
A catheter characterized by that. The catheter of claim 7,
The delivery part includes an enlarged taper part that extends from the tip of the luer taper and whose lumen expands in the distal direction, and a reduced taper part that is provided on the distal side of the enlarged taper part and the lumen decreases in the distal direction. And having
A catheter characterized by that.

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