WO2015141392A1

WO2015141392A1 - Catheter and catheter set

Info

Publication number: WO2015141392A1
Application number: PCT/JP2015/054919
Authority: WO
Inventors: 伊藤隆史
Original assignee: テルモ株式会社
Priority date: 2014-03-18
Filing date: 2015-02-23
Publication date: 2015-09-24
Also published as: JPWO2015141392A1; JP6633513B2

Abstract

This catheter set (10A) is provided with a catheter (12) and an extension shaft (14) for extending the effective length of the catheter. The catheter (12) has a tubular body (20) and a flexible shaft (16) that is formed to be thinner and longer than the tubular body (20). The shaft (16) has a connecting part (24) which is provided on a proximal end of a shaft body (22) and to which the extension shaft (14) can be connected.

Description

Catheter and catheter set

The present invention relates to a rapid exchange type catheter and catheter set capable of extending the effective length.

There are rapid exchange type catheters and over-the-wire type catheters. The rapid exchange type catheter is provided with a guide wire lumen only at its distal end, and the catheter can be exchanged more easily than an over-the-wire type catheter. As such a rapid exchange type catheter, a penetrating catheter for penetrating a stenosis portion generated in a living body lumen such as a blood vessel is known (for example, see Japanese Patent Application Laid-Open No. 2004-275435).

By the way, a stenosis is formed by inserting a guide wire through a stenosis or occlusion (such as stenosis and occlusion), which may occur in a living body lumen such as a blood vessel. Treatment of the department is extensive. And, for example, when a guide wire is passed through the stenosis part in this way, there are a penetration catheter for penetrating the stenosis part and a support catheter for assisting the tip part to suppress bending of the tip part of the guide wire. used.

However, when a penetrating catheter or a support catheter (hereinafter sometimes simply referred to as “catheter”) is advanced along the guide wire, the stenosis in the living body lumen is longer than expected by the operator, or the living body tube When there are a plurality of constricted portions continuously in the cavity, the effective length of the catheter may be insufficient. Then, it is necessary to remove the catheter inserted into the living body lumen and insert a different catheter having a longer overall length than the removed catheter into the living body lumen, which increases the cost and the treatment time. End up.

Also, in the treatment of blood vessels with many curved portions, a catheter having a longer effective length than the catheter provided in the operating room may be required. In such a case, if a substitute for a catheter having the necessary overall length cannot be prepared, the patient may not be reliably treated.

The present invention has been made in consideration of such problems, and can reduce the treatment time and cost, and can reliably treat a stenosis in a living body lumen. And it aims at providing a catheter set.

A catheter according to the present invention is a rapid exchange type catheter, and includes a cylindrical body, and a flexible shaft that is formed longer than the cylindrical body and provided at a proximal end portion of the cylindrical body. The shaft has a shaft body, and a connection portion provided at a proximal end portion of the shaft body to which an extension shaft for extending an effective length of the catheter can be connected. To do.

According to the catheter of the present invention, even when the effective length of the catheter is insufficient when treating the stenosis in the living body lumen, the effective length of the catheter is increased by connecting the extension shaft to the connecting portion. Since it can be extended, the stenosis can be reached without exchanging the catheter. As a result, the treatment time can be shortened and the cost can be reduced, and the stenosis can be reliably treated.

In the above catheter, the connecting portion may be a male portion or a female portion.

According to such a configuration, the extension shaft can be easily connected to the connection portion by fitting and coupling.

In the above catheter, the connecting portion may be a male portion made of a material having shape memory characteristics.

According to such a configuration, breakage of the connecting portion can be suppressed.

In the above catheter, the connecting portion may be formed in a wavy shape.

According to such a configuration, since the connecting portion can be elastically deformed so that the height of the wavy portion of the connecting portion is lowered in a state where the connecting portion and the extension shaft are fitted, the restoring force (elasticity) The connecting portion and the extension shaft can be firmly connected by the force).

In the above catheter, the connecting portion may be a female portion made of a plastically deformable metal material.

According to such a configuration, the connection portion and the extension shaft can be firmly connected by crimping the connection portion in a state where the connection portion and the extension shaft are fitted.

The catheter may further include an operation device that is detachably provided on the shaft body and the extension shaft.

According to such a configuration, the operability of the catheter can be improved by mounting the operation device on the shaft body. Further, since the operation device can be changed from the shaft to the extension shaft in a state where the extension shaft is connected to the connection portion, the operability can be improved while extending the effective length of the catheter.

In the above catheter, the operation device may be provided with a wire holding portion that holds a guide wire that is inserted through the lumen of the cylindrical body.

According to such a configuration, by holding the guide wire in the wire holding portion of the operation device, the operation device can be grasped and the catheter and the guide wire can be operated simultaneously.

A catheter set according to the present invention is a catheter set comprising a rapid exchange type catheter and an extension shaft for extending the effective length of the catheter, wherein the catheter is the catheter described above. And

According to the present invention, since the effective length of the catheter can be extended by connecting the extension shaft to the connecting portion, the treatment time can be shortened and the cost can be reduced, and the stenosis in the living body lumen can be achieved. The part can be treated reliably.

It is a schematic longitudinal cross-sectional view of the catheter set which concerns on 1st Embodiment of this invention. FIG. 2 is a transverse sectional view taken along line II-II in FIG. FIG. 3A is an enlarged partial cross-sectional view of a first connection portion of a catheter and a second connection portion of an extension shaft constituting the catheter set, and FIG. 3B is a connection of the first connection portion and the second connection portion. It is a partial cross section enlarged view which shows a state. FIG. 4A is an explanatory view showing a state in which a guide wire is passed through the first constriction, and FIG. 4B is an explanatory view showing a state in which the guide wire is guided to the second constriction. It is explanatory drawing which shows the state which attached the operating device to the extension shaft. It is explanatory drawing which shows the state which passed the guide wire through the 2nd constriction part. 7A is a partially omitted explanatory view of the catheter set according to the second embodiment, FIG. 7B is a partially omitted explanatory view of the catheter set according to the third embodiment, and FIG. 7C is a catheter according to the fourth embodiment. It is a partially omitted illustration of the set.

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

(First embodiment)
As shown in FIG. 1, the catheter set 10 </ b> A includes a catheter 12 and an extension shaft 14. The catheter 12 according to the present embodiment assists the distal end in order to suppress bending of the distal end of the guide wire GW that passes through a narrowed portion in a biological lumen such as a blood vessel, bile duct, trachea, esophagus, or urethra. This is a rapid exchange type support catheter. However, the catheter 12 may be a rapid exchange type penetrating catheter that penetrates the narrowed portion.

The catheter 12 includes a thin and long shaft 16, an operation device 18 that is detachably provided on the proximal end side of the shaft 16, and a cylindrical body 20 that is provided on the distal end portion of the shaft 16.

The shaft 16 has a shaft main body 22 and a first connection portion 24 provided at a base end portion of the shaft main body 22. The shaft body 22 is a solid linear member that is formed to be longer (thinner and longer) than the cylindrical body 20, and has flexibility. The shaft body 22 can be made of any material, but can be made of a metal material such as stainless steel, Ni—Ti alloy, or cobalt alloy. In particular, when the catheter 12 is configured as a penetrating catheter, if the shaft main body 22 is formed of a solid metal wire, an appropriate rigidity is obtained in the shaft main body 22 and a pushing force acting on the proximal end side of the shaft main body 22 is obtained. Can be efficiently transmitted to the cylindrical body 20.

The first connecting portion 24 is configured such that the extension shaft 14 for extending the effective length of the catheter 12 can be connected. The configuration of the first connection unit 24 will be described later.

The operation device 18 is formed in a size that can be easily operated by a human hand, and includes a cylindrical handle 28 having a lumen 26 through which the shaft 16 is inserted, a chuck 30 disposed at a distal end opening of the handle 28, A cap 32 that is screw-fitted to the distal end side of the handle 28.

The chuck 30 has a through-hole through which the shaft 16 is inserted at the center thereof, and the large-diameter portion on the distal end side is the handle 28 with the small-diameter portion on the proximal end side disposed in the distal-end opening of the handle 28. Exposed from the lumen. The outer surface of the large diameter portion is formed in a tapered shape that gradually decreases in diameter toward the small diameter portion. The chuck 30 is formed with a plurality of slits 38 (not shown) extending in the axial direction and communicating with the through holes in the circumferential direction. Each slit 38 extends from the tip of the large diameter portion to the middle of the small diameter portion.

In the operation device 18 having such a configuration, when the screw fitting force of the cap 32 with respect to the handle 28 is increased with the shaft body 22 being passed through the lumen 26 of the handle 28 through the through hole of the chuck 30, the size of the chuck 30 is increased. The diameter portion is pressed toward the handle 28 and the through hole of the chuck 30 is reduced in diameter. If it does so, since the wall surface which comprises a through-hole is pressed on the outer surface of the shaft main body 22, the operation device 18 will be fixed with respect to the shaft main body 22. FIG. On the other hand, when the screw fitting force of the cap 32 with respect to the handle 28 is weakened, the diameter of the through hole of the chuck 30 is increased, so that the fixing of the operating device 18 is released and the operating device 18 and the shaft body 22 can move relatively. Become.

The operation device 18 according to the present embodiment further includes a wire holding portion 34 that is fixed to the proximal end side of the handle 28 and holds the guide wire GW. The wire holding part 34 can be comprised with a rubber material, for example.

As shown in FIG. 2, the wire holding part 34 is formed with a circular hole 36 and a slit 38 that communicates with the hole 36 and opens on the surface opposite to the handle 28. Each of the hole 36 and the slit 38 passes through the wire holding portion 34 along the axial direction of the handle 28 (see FIG. 1). The hole 36 has a hole diameter that is smaller than the outer diameter of the guide wire GW. The slit 38 is formed so as to gradually narrow toward the hole 36.

In the wire holding portion 34 configured as described above, the wall of the hole 36 is pushed outward in the radial direction by the guide wire GW by inserting the guide wire GW into the hole 36 through the slit 38. Therefore, the guide wire GW is held on the wall surface forming the hole 36 by the restoring force of the wire holding portion 34.

The cylindrical body 20 is configured in a cylindrical shape, and a distal end portion of the shaft 16 is fixed to a proximal end portion thereof. The cylindrical body 20 is disposed between an inner layer 42 having a lumen (guide wire lumen) 40 through which the guide wire GW can be inserted, an outer layer 44 provided on the outer peripheral side of the inner layer 42, and the inner layer 42 and the outer layer 44. Reinforcing body (blade) 46. In addition, the distal end portion of the cylindrical body 20 is located at the boundary between the outer peripheral surface of the guide wire GW and the outer peripheral surface of the distal end of the cylindrical body 20 from the viewpoint of entering into the constricted portion and preventing damage to the living body lumen. It is preferable that the tapered surface is tapered toward the tip so that the formed step surface is small. In the case of the support catheter, the radial thickness of the tapered distal end portion of the cylindrical body 20 is larger than the radial thickness of the proximal end portion of the cylindrical body 20 so that the distal end portion of the guide wire can be easily assisted. It is preferable that the thickness is too thick.

The inner layer 42 can be made of any material, but can be made of, for example, a fluorine resin such as PTFE (polytetrafluoroethylene). In this case, since the friction coefficient of the surface constituting the lumen 40 can be made relatively small, the guide wire GW can be smoothly inserted into the lumen 40.

The outer layer 44 can be composed of any material, but can be composed of, for example, various thermoplastic elastomers such as polyurethane elastomer, polyester elastomer, polyamide elastomer, and mixtures thereof. Further, a tapered portion is formed at the tip of the outer layer 44. By tapering the distal end in this manner, the catheter 12 can easily pass through the stenosis.

The reinforcing body 46 is embedded in the outer layer 44 in a net-like state. The reinforcing body 46 can be made of any material, but for example, tungsten, stainless steel, or the like can be used. The reinforcing body 46 may be formed in a spiral coil shape or a rod shape.

In addition, it is preferable to provide an X-ray opaque marker or the like on the cylinder 20 so that the position of the catheter 12 in the living body lumen can be confirmed. For example, an X-ray opaque material such as barium sulfate, bismuth oxide, tungsten or the like is added to the material constituting the cylinder 20 in order to grasp the position of the cylinder 20 in the living body lumen. You may keep it. Further, the cylindrical body 20 may be provided with an X-ray opaque marker such as platinum on the distal end portion and the proximal end portion of the cylindrical body 20 in order to measure the stenosis portion in the living body lumen.

As shown in FIG. 3A, the first connecting portion 24 folds a linear member made of a material having shape memory characteristics, such as a Ti—Ni shape memory alloy, into a wave shape from the approximate center of the base end surface of the shaft body 22. It is formed so as to bend. That is, the 1st connection part 24 is comprised as a male part.

The width dimension (interval between wave peaks and valleys) W of the first connection portion 24 is formed to be approximately the same as the outer diameter D1 of the shaft body 22. Thereby, when operating the catheter 12, it can suppress that the 1st connection part 24 interferes with an operator's finger | toe, another medical device, etc. FIG.

The extension shaft 14 is a tubular member having a lumen 48 opened from the distal end to the proximal end thereof, and is provided integrally with the extension shaft main body 50 and the distal end portion of the extension shaft main body 50 so that the first connection of the catheter 12 is achieved. And a second connecting portion 52 connectable to the portion 24. The extension shaft 14 can be made of the same material as that of the shaft body 22 and can be set to an arbitrary length.

The second connection portion 52 is configured as a female portion that is fitted and coupled to the first connection portion 24 that is a male portion. The hole diameter D <b> 2 of the second connection portion 52 is smaller than the width dimension W of the first connection portion 24. Therefore, when the first connection portion 24 is inserted into the lumen 48 of the second connection portion 52, the first connection portion 24 has a narrow width (the height of the crest of the first connection portion 24 is reduced). Since it is elastically deformed (to be lowered), the restoring force of the first connecting portion 24 can be applied to the inner surface of the second connecting portion 52. Thereby, the 1st connection part 24 and the 2nd connection part 52 can be firmly fittingly joined (refer FIG. 3B).

Further, the outer diameter D3 of the second connection portion 52 is formed substantially the same as the outer diameter D1 of the shaft body 22. Thereby, in the state which connected the 1st connection part 24 and the 2nd connection part 52, since the outer surface of the shaft main body 22 and the outer surface of the 2nd connection part 52 become flush, the shaft main body 22 and the 2nd connection part It can be avoided that the boundary with 52 interferes with other medical devices (such as a guiding catheter).

Further, although not shown, it is preferable to provide an X-ray opaque marker such as platinum at the proximal end portion of the catheter 12 (the proximal end portion of the shaft body 22 or the first connection portion 24). By comprising in this way, when connecting the catheter 12 and the extension shaft 14, a connection position can be grasped under X-ray contrast. Although not shown, an X-ray contrast marker may also be provided at the distal end portion of the extension shaft 14 or the second connection portion 52. By configuring in this way, it is possible to confirm the degree of connection of the first connection part 24 and the second connection part 52 in the body lumen or the like under X-ray contrast.

The catheter set 10A according to the present embodiment is basically configured as described above, and the effects will be described below.

The catheter set 10 </ b> A according to the present embodiment continues, for example, a first stenosis part 202 and a second stenosis part 204 that are lesions with a high degree of stenosis or chronic total occlusion lesions (CTO: Chronic Total Occlusion) occurring in the blood vessel 200. Can be applied to the treatment method. When treating the first stenosis 202 and the second stenosis 204, first, for example, a sheath introducer (not shown) is punctured into a blood vessel (for example, radial artery or femoral artery) by the Seldinger method, and a guide wire is inserted. The GW is introduced in advance and the guiding catheter 206 is placed at a predetermined position in the predetermined blood vessel 200. At this time, since the guide wire GW cannot pass through the first constricted portion 202 alone, the guide wire GW is positioned on the near side (the central side and the right side in FIG. 4A) of the first constricted portion 202.

Next, the guide wire GW is passed through the lumen 40 of the cylindrical body 20 of the catheter 12 as a support catheter, the catheter 12 is advanced through the lumen of the guiding catheter 206 along the guide wire GW, and the distal end thereof is guided. It is located near the tip of the wire GW. In the initial state, the extension shaft 14 is not attached to the catheter 12, and the operation device 18 is attached to the proximal end portion of the shaft body 22.

Subsequently, the surgeon passes the guide wire GW through the first constricted portion 202 while assisting the distal end portion of the guide wire GW with the catheter 12 (see FIG. 4A). At this time, the operator may operate to push the guide wire GW and the catheter 12 alternately to the first stenosis part 202 by a predetermined length alternately, or the guide wire GW and the catheter 12 together to the first stenosis part 202. You may operate so that it may push forward.

When the guide wire GW and the catheter 12 are operated together, the proximal end side of the guide wire GW is fixed to the operation device 18 by inserting it into the hole 36 through the slit 38 of the wire holding portion 34. Thus, the operator can easily operate both the guide wire GW and the catheter 12 simultaneously by grasping the operation device 18. By passing the guide wire GW through the first stenosis 202, the treatment of the first stenosis 202 is completed.

At this stage, since the second stenosis part 204 is present on the distal side of the treated first stenosis part 202, sufficient blood perfusion may not be obtained on the distal side of the first stenosis part 202. . In this case, the treatment of the second stenosis 204 is continued.

That is, the surgeon operates the guide wire GW and presses the distal end thereof against the second constricted portion 204 (see FIG. 4B). In the treatment of the first constricted portion 202, when the guide wire GW is fixed to the operation device 18, the guide wire GW is operated after the guide wire GW is removed from the wire holding portion 34 of the operation device 18. To do.

If it is not easy to pass the guide wire GW through the second constricted portion 204, the distal end of the catheter 12 is positioned in the vicinity of the distal end of the guide wire GW. At this time, when the distance between the first stenosis part 202 and the second stenosis part 204 is relatively long, the catheter 12 may not reach the second stenosis part 204.

Therefore, in the present embodiment, when the second stenosis portion 204 is treated, the effective length of the catheter 12 is extended by connecting the extension shaft 14 to the first connection portion 24 of the catheter 12. That is, the first connection portion 24 formed to be bent in a wave shape is inserted into the lumen 48 of the second connection portion 52. Then, the first connecting portion 24 is elastically deformed so that the height of the wavy mountain is lowered and the restoring force acts on the inner surface of the second connecting portion 52, so that the first connecting portion 24 and the second connecting portion 52 are It is firmly fitted and connected. At this time, it goes without saying that the operator selects the extension shaft 14 having a length corresponding to the distance from the first stenosis part 202 to the second stenosis part 204 and connects it to the catheter 12.

Further, the operator releases the fixation of the operation device 18 to the shaft 16 by operating the cap 32 of the operation device 18 to weaken the screw fitting force to the handle 28. Thereafter, the operating device 18 is moved with respect to the extension shaft 14 by operating the cap 32 in a state where the operating device 18 is moved to an arbitrary position on the proximal end side of the extension shaft main body 50 to increase the screw fitting force with respect to the handle 28. (See FIG. 5).

Subsequently, the guide wire GW is passed through the second constricted portion 204 while assisting the distal end portion of the guide wire GW with the catheter 12 (see FIG. 6). Since the treatment of the second stenosis part 204 is the same as the treatment of the first stenosis part 202 described above, detailed description thereof is omitted. After the treatment of the second stenosis 204, the catheter 12 and the guide wire GW are removed from the blood vessel 200.

According to the present embodiment, the effective length of the catheter 12 can be extended by connecting the second connection portion 52 of the extension shaft 14 to the first connection portion 24 of the catheter 12. Therefore, after treating the first stenosis 202 on the near side (central side), the effective length of the catheter 12 is used when treating the second stenosis 204 present on the distal side of the first stenosis 202. Even if this is insufficient, the catheter 12 can reach the second constricted portion 204 by connecting the extension shaft 14 to the catheter 12. This eliminates the need to replace the catheter 12 with a different catheter having a long effective length after treating the first stenosis 202, thereby reducing the treatment time and reducing the cost and the first stenosis 202. And the 2nd constriction part 204 can be treated reliably.

In the present embodiment, since the first connecting portion 24 of the catheter 12 is a male portion and the second connecting portion 52 of the extension shaft 14 is a female portion, the first connecting portion 24 and the second connecting portion 52 are fitted and joined. Thus, the extension shaft 14 can be easily connected to the catheter 12. Moreover, since the 1st connection part 24 is comprised with the material which has a shape memory characteristic, breakage of the 1st connection part 24 can be suppressed.

Further, since the first connecting portion 24 is formed in a wave shape, when the first connecting portion 24 is inserted into the inner cavity 48 of the second connecting portion 52, the height of the wave mountain of the first connecting portion 24 is increased. The first connecting portion 24 can be elastically deformed so that the height is low. Thereby, since the restoring force of the 1st connection part 24 can be made to act on the inner surface of the 2nd connection part 52, the 1st connection part 24 and the 2nd connection part 52 can be connected firmly.

According to this embodiment, since the operation device 18 can be attached to the shaft 16, the operability of the catheter 12 can be improved. Further, since the operation device 18 can be changed from the shaft 16 to the extension shaft 14 in a state where the extension shaft 14 is connected to the first connection portion 24, the operability can be improved while extending the effective length of the catheter 12. it can.

Furthermore, since the guide wire GW can be held by the wire holding portion 34 of the operation device 18, the operation device 18 can be held and the catheter 12 and the guide wire GW can be operated simultaneously.

The catheter set 10A according to the present embodiment is not limited to the configuration described above. The extension shaft 14 may be configured, for example, by providing a tubular second connection portion 52 at the distal end portion of a thin and solid extension shaft main body 50. In this case, since the rigidity of the extension shaft main body 50 is increased, the pushing force applied to the extension shaft main body 50 can be efficiently transmitted to the shaft 16.

Further, the second connection portion 52 may be made of a plastically deformable metal material. In this case, it is possible to clamp the second connecting portion 52 with forceps or the like while the first connecting portion 24 is inserted into the lumen 48 of the second connecting portion 52. Thereby, the 1st connection part 24 and the 2nd connection part 52 can be fitted and connected still more firmly.

The catheter set 10A according to the present embodiment can also be used for the treatment of a relatively long stenosis part or the treatment of a stenosis part generated in a blood vessel of a lower limb. In the latter case, for example, when treatment is performed to guide the catheter 12 inserted from the radial artery to a stenosis that has occurred in the blood vessel of the lower limb, the blood vessel has many curved portions, and the effective length of the catheter 12 may be insufficient. is there. However, according to the present embodiment, since the effective length can be extended by connecting the extension shaft 14 to the catheter 12, the catheter 12 can be reliably attached to the stenosis without replacing the catheter 12 with another catheter having a long effective length. Treatment can be performed.

The catheter set 10A can also be used together with a therapeutic catheter such as a balloon catheter, a stent delivery catheter, or a drug injection catheter. In this case, the catheter 12 can be inserted through the therapeutic catheter. It may be a penetrating catheter provided with a cylindrical body 20 having a cavity 40 at the distal end.

(Second Embodiment)
Next, a catheter set 10B according to the second embodiment of the present invention will be described. In addition, about the catheter set 10B which concerns on 2nd Embodiment, the same referential mark is attached | subjected to the structure same as catheter set 10A which concerns on 1st Embodiment mentioned above, and detailed description is abbreviate | omitted. The same applies to a catheter set 10C according to a third embodiment described later and a catheter set 10D according to the fourth embodiment.

As shown in FIG. 7A, the catheter set 10B according to this embodiment is different from the catheter set 10A according to the first embodiment described above in the configuration of the shaft 62 and the extension shaft 64 of the catheter 60.

That is, the shaft 62 is a tubular member having a lumen 66 that opens from the distal end to the proximal end thereof, and includes a shaft body 68 and a first connection portion 70 that is integrally provided at the proximal end portion of the shaft body 68. Have That is, the 1st connection part 70 is comprised as a female part.

The extension shaft 64 has a thin and solid extension shaft main body 72 and a second connection portion 74 provided at the tip of the extension shaft main body 72. The outer diameter of the extension shaft main body 72 is set to be substantially the same as the outer diameter of the first connection portion 70. Thereby, in the state which connected the 1st connection part 70 and the 2nd connection part 74, since the outer surface of the 1st connection part 70 and the outer surface of the extension shaft main body 72 become flush | planar, extension with the 1st connection part 70 is carried out. It is possible to avoid the boundary portion with the shaft main body 72 from interfering with other medical devices (such as a guiding catheter). Since the second connection portion 74 has the same configuration as the first connection portion 24 of the first embodiment described above, detailed description thereof is omitted.

In the present embodiment, when the second connecting portion 74 is inserted into the lumen 66 of the first connecting portion 70 of the catheter 60, the restoring force of the second connecting portion 74 acts on the inner surface of the first connecting portion 70. The connecting portion 70 and the second connecting portion 74 are firmly fitted and coupled.

According to the present embodiment, the same effects as those of the first embodiment described above can be obtained. In addition, since the extension shaft main body 72 is configured to be solid, the rigidity can be increased compared to the case where the extension shaft main body 72 is configured to be hollow. Thereby, the pushing force which acted on the base end side of the extension shaft main body 72 can be efficiently transmitted to the shaft 62.

Further, since the shaft 62 is a tubular member having a constant outer diameter by integrally providing the first connecting portion 70 at the base end portion of the shaft main body 68, the extension shaft 64 is connected to the first connecting portion 70. When the catheter 60 is operated in the absence, the first connecting portion 70 can be prevented from interfering with the operator's fingers and other medical devices.

The catheter set 10B according to the present embodiment is not limited to the configuration described above. For example, the shaft body 68 may be configured to be solid. In this case, the rigidity of the shaft main body 68 can be increased as compared with the case where the shaft main body 68 is hollow. Thereby, the pushing force which acted on the base end side of the shaft main body 68 can be efficiently transmitted to the cylindrical body 20.

Further, the first connection portion 70 may be made of a metal material that can be plastically deformed. If it does so, the 1st connection part 70 can be crimped with forceps etc., and, thereby, the 1st connection part 70 and the 2nd connection part 74 can be connected still more firmly. In this case, the shaft main body 68 and the first connection portion 70 can be made of different materials.

(Third embodiment)
Next, a catheter set 10C according to a third embodiment of the present invention will be described. As shown in FIG. 7B, the catheter set 10C according to the present embodiment is different from the catheter set 10A according to the first embodiment described above in the configuration of the extension shaft 80, and includes a connecting portion 82.

The extension shaft 80 has an extension shaft main body 84 and a second connection portion 86, and has the same configuration as the extension shaft 64 according to the second embodiment described above. Therefore, detailed description of the extension shaft 80 is omitted.

The connecting portion 82 is a tubular member having an inner cavity 88 that opens from the distal end to the proximal end, and can be made of the same material as the shaft body 22. The connecting portion 82 is formed to be somewhat longer than the total length of the length along the axial direction of the shaft body 22 of the first connecting portion 24 and the length along the axial direction of the extension shaft main body 84 of the second connecting portion 86. Has been.

In the present embodiment, when the first connecting part 24 is inserted into one opening of the connecting part 82, the restoring force of the first connecting part 24 acts on the inner surface of the connecting part 82, so the first connecting part 24 and the connecting part 82 is firmly fitted and coupled. And if the 2nd connection part 86 is inserted in the other opening part of the connection part 82, since the restoring force of the 2nd connection part 86 will act on the inner surface of the connection part 82, the 2nd connection part 86 and the connection part 82 will be It is firmly fitted and connected. Thereby, the 1st connection part 24 and the 2nd connection part 86 will be firmly connected via the connection part 82. FIG. According to the present embodiment, the same effects as those of the first embodiment described above can be obtained.

(Fourth embodiment)
Next, a catheter set 10D according to a fourth embodiment of the present invention will be described. As shown in FIG. 7C, the catheter set 10D according to this embodiment differs from the catheter set 10A according to the first embodiment described above in the configuration of the shaft 92 of the catheter 90, and includes a connecting portion 94.

The shaft 92 has a shaft main body 96 and a first connection portion 98, and has the same configuration as the shaft 62 according to the second embodiment described above. Therefore, detailed description of the shaft 92 is omitted. The connecting portion 94 has the same configuration as the first connecting portion 24 of the first embodiment described above, and a linear member made of a material having shape memory characteristics such as a Ti—Ni-based shape memory alloy is used. It is configured by bending in a wave shape.

In the present embodiment, when one end side of the connecting portion 94 is inserted into the lumen 100 of the first connecting portion 98, the restoring force on the one end side of the connecting portion 94 acts on the inner surface of the first connecting portion 98. The part 98 and the connecting part 94 are firmly fitted and coupled. When the other end side of the connecting portion 94 is inserted into the lumen 48 of the second connecting portion 52, the restoring force on the other end side of the connecting portion 94 acts on the inner surface of the second connecting portion 52. 52 and the connecting portion 94 are firmly fitted and coupled. Thereby, the 1st connection part 98 and the 2nd connection part 52 will be firmly connected via the connection part 94. FIG. According to the present embodiment, the same effects as those of the first embodiment described above can be obtained.

The catheter and the catheter set according to the present invention are not limited to the above-described embodiments, and various configurations can be adopted without departing from the gist of the present invention.

Claims

A rapid exchange catheter (12, 60, 90),
A cylinder (20);
A flexible shaft (16, 62, 92) that is formed longer than the cylindrical body (20) and provided at the proximal end of the cylindrical body (20);
The shaft (16, 62, 92) includes a shaft body (22, 68, 96) and a proximal end portion of the shaft body (22, 68, 96) and the catheter (12, 60, 96). 90) and a connecting portion (24, 70, 98) to which an extension shaft (50, 72, 84) for extending the effective length can be connected.
Catheter (12, 60, 90) characterized in that.
The catheter (12, 60, 90) according to claim 1,
The catheter (12, 60, 90), wherein the connecting part (24, 70, 98) is a male part or a female part.
Catheter (12) according to claim 2,
The catheter (12), wherein the connecting portion (24) is a male portion made of a material having shape memory characteristics.
Catheter (12) according to claim 3,
The catheter (12), wherein the connecting portion (24) is formed in a wave shape.
The catheter (60, 90) according to claim 2,
The catheter (60, 90), wherein the connecting portion (70, 98) is a female portion made of a plastically deformable metal material.
The catheter (12, 60, 90) according to claim 1,
The catheter (12, 60, 90) further comprising an operation device (18) detachably provided on the shaft body (22, 68, 96) and the extension shaft (50, 72, 84).
The catheter (12, 60, 90) according to claim 6,
The operation device (18) is provided with a wire holding portion (34) for holding a guide wire (GW) inserted through the lumen (40) of the cylindrical body (20) ( 12, 60, 90).
Rapid exchange catheters (12, 60, 90);
An extension shaft (50, 72, 84) for extending the effective length of the catheter (12, 60, 90);
A catheter set (10A-10D) comprising:
The catheter (12, 60, 90) includes a cylinder (20),
A flexible shaft (16, 62, 92) that is formed longer than the cylindrical body (20) and provided at the proximal end of the cylindrical body (20);
The shaft (16, 62, 92) includes a shaft body (22, 68, 96) and a proximal end portion of the shaft body (22, 68, 96) and the catheter (12, 60, 96). 90) the connecting shaft (24, 70, 98) to which the extension shaft (50, 72, 84) for extending the effective length can be connected.
A catheter set (10A to 10D) characterized by the above.