WO2020217463A1

WO2020217463A1 - Catheter and stent delivery system

Info

Publication number: WO2020217463A1
Application number: PCT/JP2019/017971
Authority: WO
Inventors: 博文谷口
Original assignee: オリンパス株式会社
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-10-29

Abstract

A catheter that comprises: an inner cylinder part that includes an inner cylinder that has a guide wire lumen; and an outer cylinder part that has a side hole in an outer circumferential surface thereof and has the inner cylinder part inserted therethrough such that the inner cylinder part is capable of relative movement.　At a tip end part thereof, the inner cylinder has an opening that communicates with the guide wire lumen. At an outer circumferential surface thereof, the inner cylinder has a communication hole that communicates with the guide wire lumen. The inner cylinder also has an inclined surface that extends from an inner surface of the guide wire lumen toward the communication hole and is fixed inside the inner cylinder. A tip end of the inclined surface is further to the tip end side of the inner cylinder than a base end of the inclined surface.

Description

Catheter and stent delivery system

The present invention relates to catheters, more specifically catheters through which guide wires are passed during use, and stent delivery systems.

A technique is known in which a stent is placed and expanded for stenosis or occlusion (hereinafter referred to as "stenosis or the like") that occurs in the digestive tract, blood vessels, or the like.
The stent is carried to the indwelling site while attached to the delivery catheter. At that time, first, the guide wire is made to reach the tip (back) of the stenosis or the like, and then the delivery catheter is made to break through the stenosis or the like along the guide wire. At this time, the end of the guide wire outside the body is inserted into the delivery catheter, so that the delivery catheter can be advanced along the guide wire.

If the end of the guide wire inserted into the delivery catheter is pulled out from the intermediate portion in the longitudinal direction of the delivery catheter, the guide wire can be shortened and the introduction of the delivery catheter becomes easy. The structure in which the end of the guide wire is pulled out from the intermediate portion in the longitudinal direction of the delivery catheter is also called "monorail type", "rapid exchange type" or the like.

Patent Document 1 describes a rapid exchange type delivery catheter. This delivery catheter includes an inner tubular member and an outer tubular member, and a self-expandable stent is arranged in a reduced diameter state between the outer peripheral surface of the inner tubular member and the inner peripheral surface of the outer tubular member.
The guide wire is inserted through the tip opening of the inner tubular member and pulled out from the opening formed on the outer peripheral surface of the inner tubular member. The guide wire is further pulled out of the delivery catheter through an opening formed on the outer peripheral surface of the outer tubular member. The opening of the outer cylinder member has a slope portion extending into the internal space, and the guide wire coming out of the inner cylinder member is assisted toward the opening of the outer cylinder member.

U.S. Pat. No. 8685078

Since the slope portion described in Patent Document 1 is not joined to the inner cylinder member, the guide wire coming out of the inner cylinder member enters between the slope portion and the inner cylinder member and guides the guide wire to the opening of the outer cylinder member. It may not come out of the delivery catheter.

Based on the above circumstances, an object of the present invention is to provide a catheter and a stent delivery system that have a monorail type structure and can smoothly pull out a guide wire inserted from the tip to the outside.

A first aspect of the present invention is a catheter including an inner cylinder portion including an inner cylinder having a guide wire lumen and an outer cylinder portion having a side hole on an outer peripheral surface through which the inner cylinder portion is relatively movable. Is.
The inner cylinder has an opening at the tip that communicates with the guide wire lumen, and has a communication hole that communicates with the guide wire lumen on the outer peripheral surface, extends from the inner surface of the guide wire lumen toward the communication hole, and enters the inner cylinder. It has a fixed slope. The tip of the slope is located closer to the tip of the inner cylinder than the base end of the slope.

A second aspect of the present invention is a delivery having an inner cylinder portion including an inner cylinder having a guide wire lumen and an outer cylinder portion having a side hole on the outer peripheral surface through which the inner cylinder portion is relatively movable. It is a stent delivery system including a catheter and a stent housed in a gap between an inner cylinder and an outer cylinder.
The inner cylinder has an opening at the tip that communicates with the guide wire lumen, and has a communication hole that communicates with the guide wire lumen on the outer peripheral surface, extends from the inner surface of the guide wire lumen toward the communication hole, and enters the inner cylinder. It has a fixed slope. The tip of the slope is located closer to the tip of the inner cylinder than the base end of the slope.
The stent is housed on the distal side of the side and communication holes.

According to the present invention, the guide wire inserted from the tip can be smoothly pulled out to the outside while having a monorail type structure.

It is an overall view of the stent delivery system which concerns on 1st Embodiment of this invention. It is an exploded view of the inner cylinder part which concerns on the stent delivery system. It is a figure which shows the tip part of the stent delivery system with a partial break and a cross section. It is a figure which shows the state which the guide wire is inserted into the stent delivery system. It is a figure which shows a part of the inner cylinder part which concerns on the modification of the stent delivery system. It is a figure which shows a part of the inner cylinder part of the stent delivery system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the modification of the inner cylinder part. It is a figure which shows the modification of the inner cylinder part. It is a figure which shows the modification of the inner cylinder part. It is a figure which shows the modification of the inner cylinder part. It is a figure for demonstrating the positional relationship of the side hole of an outer cylinder, the communication hole of an inner cylinder, and a slope. It is a figure which shows the tip part of the shaft which concerns on the modification of this invention. It is a figure which shows the outer cylinder part which concerns on the modification of this invention. It is a figure which shows the outer cylinder part which concerns on the modification of this invention.

The first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is an overall view of the stent delivery system 1 of the present embodiment. The stent delivery system 1 includes a delivery catheter 10 and a self-expandable stent (not shown, described below).

The delivery catheter 10 is formed in an elongated shape as a whole, and includes an outer cylinder portion 20 and an inner cylinder portion 50 passed through the outer cylinder portion 20. The outer cylinder portion 20 has an outer cylinder 21 and a grip portion 25 attached to one end of the outer cylinder 21.

The outer cylinder 21 is made of resin or the like and has flexibility. The outer cylinder 21 has openings at the tip 22 and the base end 23. Each opening communicates with the internal space (lumen) of the outer cylinder 21. A side hole 24 communicating with the lumen is formed on the outer peripheral surface of the outer cylinder 21 in the intermediate portion in the longitudinal direction.

The grip portion 25 is attached to the base end 23 of the outer cylinder 21. A through hole 26 is formed in the grip portion 25. The through hole 26 communicates with the lumen of the outer cylinder 21. The shape of the grip portion 25 is not particularly limited. The grip portion 25 may be integrally formed with the outer cylinder 21 by resin molding or the like.

FIG. 2 is an exploded view of the inner cylinder portion 50. The inner cylinder portion 50 has an inner cylinder 51, a tip 60 provided at the tip of the inner cylinder 51, and a shaft 70 connected to the inner cylinder 51.

The inner cylinder 51 has an outer diameter smaller than the inner diameter of the outer cylinder 21, and can be passed through the outer cylinder portion 20. The inner cylinder 51 is made of resin or the like and has flexibility. The material of the outer cylinder portion 20 and the material of the inner cylinder 51 may be the same or different.
The inner cylinder 51 has openings at the tip 52 and the base end 53. Each opening communicates with the lumen (guide wire lumen) of the inner cylinder 51. A communication hole 54 that communicates with the lumen is formed on the outer peripheral surface of the inner cylinder 51 in the intermediate portion in the longitudinal direction.

The tip 60 has a substantially conical shape and has a through hole 61 extending in the axial direction. The tip 60 has a tip 62 having a small diameter and a base end 63 having a large diameter, and is connected to the inner cylinder 51 on the base end 63 side. Since the diameter of the base end 63 is larger than the outer diameter of the inner cylinder 51, there is a step 65 at the connection portion between the chip 60 and the inner cylinder 51. Since the through hole 61 communicates with the lumen of the inner cylinder 51, when the guide wire is inserted into the through hole 61 of the tip 60, the through hole 61 can be inserted into the lumen of the inner cylinder 51.

The shaft 70 is an elongated member having a certain rigidity. The tip of the shaft 70 has a slope 71 that is angled with respect to the axis of the shaft 70. A handle 80 gripped by the user is connected to the base end of the shaft 70.

The tip of the shaft 70 enters the shaft 70 through the opening of the base end 53 of the inner cylinder 51 and is fixed to the lumen of the inner cylinder 51 by adhesion or the like.
FIG. 3 shows a partially broken and cross-sectional view of the tip of the stent delivery system 1. The slope 71 formed at the tip of the shaft 70 has a portion (slope base end 71a) closest to the base end side in the longitudinal direction of the shaft 70, which is closest to the communication hole 54 formed in the inner cylinder 51, and the shaft. The most tip-side portion (slope tip 71b) in the longitudinal direction of is the farthest from the communication hole 54. The slope 71 extends from the inner surface of the inner cylinder 51 toward the communication hole 54 and is fixed to the inner cylinder 51.
In the longitudinal direction of the inner cylinder portion 50, the slope tip 71b is located on the tip side of the slope base end 71a. In the circumferential direction of the inner cylinder 51, the slope base end 71a and the slope tip 71b are in a positional relationship shifted by about 180 degrees in phase, and face each other with the central axis of the inner cylinder 51 in between.
As shown in FIG. 3, in the longitudinal direction of the delivery catheter 10 in which the outer cylinder 21 is in contact with the tip 60, the base end portion of the side hole 24 and the slope base end 71a are in substantially the same positional relationship.

In the tubular self-expandable stent 100, in a state where the inner cylinder 51 is passed through the inside and the diameter is reduced, in the gap between the inner cylinder 51 and the outer cylinder 21 on the tip side of the side hole 24 and the communication hole 54. It is contained. One of the meshes of the self-expandable stent 100 is locked to a locking portion (not shown) such as a protrusion formed on the outer peripheral surface of the inner cylinder 51. As a result, the self-expandable stent 100 is positioned with respect to the inner cylinder portion 50 in the reduced diameter state, and does not move relative to the inner cylinder portion 50 in the longitudinal direction.

Examples of materials for the outer cylinder 21 and the inner cylinder 51 include the following. The material is not particularly limited as long as the desired mechanical properties of the outer cylinder 21 and the inner cylinder 51 are satisfied.
-Olefin resins such as polypropylene and polyethylene, copolymer resins thereof, polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), and general-purpose resins such as polyvinyl alcohol (PVA).
-Engineering resins such as polyamide resins, fluororesins (eg, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), PFA, FEP, ETFE, etc.), polyetheretherketone (PEEK), and the like.
-In addition, various elastomer resins (polystyrene-based, polyolefin-based, polyurethane-based, polyester-based, polyamide-based, polyvinyl chloride-based, etc.), silicone-containing resins, polyurethane-based resins, etc. can be used alone or in combination. Further, in order to suppress the occurrence of buckling and the like, a material composite with a mesh made of stainless steel or the like can also be used.
Furthermore, in the case of catheters and delivery systems used under X-ray fluoroscopy, X-ray opaque metallic markers (medical X-ray opaque metals and alloys such as platinum, tungsten, and iridium) may be added or X-ray opaque. A permeable material (such as barium sulfate) may be mixed.

As the material of the shaft 70, resin, metal, or the like can be used. Examples of the metal include stainless steel and nickel titanium alloy. The shaft 70 is required to have sufficient rigidity to withstand the operation of relatively moving the handle 80 and the grip portion 25, and to receive the guide wire that has entered the lumen of the inner cylinder 51 without causing a large deformation. Further, when it is inserted into the bent body cavity of the human body, it is required to have flexibility enough to follow the bending. Not limited to the above, it can be used as a material for the shaft 70 as long as it has mechanical properties that satisfy these requirements.
A certain area on the base end side of the shaft 70 that does not enter the body during the procedure may be reinforced with a straight pipe or the like having high rigidity (for example, made of stainless steel). In this way, when the grip portion 25 is relatively moved while the handle 80 is gripped and fixed, the shaft is easily maintained in a linear state, and the grip portion 25 is easily slid.

An example of the operation when the stent delivery system 1 configured as described above is used will be described.
The operator passes the guide wire through the channel of the side-viewing endoscope and inserts the guide wire into the bile duct while observing with the endoscope. Subsequently, the surgeon operates the guide wire under fluoroscopy to break through the stenotic site in the bile duct and move the tip of the guide wire closer to the liver than the stenotic site.

The surgeon inserts the proximal end of the guide wire protruding from the forceps opening of the endoscope into the through hole 61 of the tip 60 of the stent delivery system 1. The guide wire enters the lumen of the inner cylinder 51 through the through hole 61.
The guide wire traveling in the lumen of the inner cylinder 51 toward the base end 53 eventually comes into contact with the slope 71 of the shaft 70. The base end portion of the guide wire is guided to the communication hole 54 by advancing along the slope 71, and as shown in FIG. 4, the guide wire Gw smoothly exits from the communication hole 54 to the outside of the inner cylinder 51.

The base end portion of the guide wire Gw that has come out of the inner cylinder 51 subsequently passes through the side hole 24 and goes out of the outer cylinder 21. This completes the insertion of the guide wire Gw into the stent delivery system 1.
The user can advance the stent delivery system 1 along the guide wire Gw by pushing the stent delivery system 1 while holding the guide wire Gw.

When the tip of the stent delivery system 1 breaks through the stenotic site, the user advances and retreats the stent delivery system 1 to determine the placement position of the self-expandable stent 100.
After determining the placement position of the self-expandable stent 100, the user pulls the grip 25 toward the hand while holding the handle 80. Then, the outer cylinder portion 20 retracts with respect to the inner cylinder portion 50. As a result, the self-expandable stent 100 is gradually exposed from the distal end side and expands. When the self-expandable stent 100 is completely exposed, the self-expandable stent 100 expands in the entire axial direction, and the inner diameter of the self-expandable stent 100 becomes larger than the outer diameter of the inner cylinder 51. Along with this, the lock between the self-expandable stent 100 and the inner cylinder portion 50 is also released. Until the self-expandable stent 100 is completely expanded, the outer cylinder portion 20 is advanced with respect to the inner cylinder portion 50 to reduce the diameter of the self-expandable stent 100, and the outer cylinder portion 20 and the inner cylinder portion 50 It can also be accommodated (recaptured) again in the meantime. Recapture is useful when resetting the detention position.

When the user retracts the delivery catheter 10 after the self-expandable stent 100 and the inner cylinder portion 50 are released from the lock, the self-expandable stent 100 stays in the indwelling position and the delivery catheter 10 stays in the self-expandable stent. Removed from 100.
When the user pulls out the delivery catheter 10 from the body, the indwelling procedure of the self-expandable stent 100 is completed. Then, a contrast tube may be introduced along the guide wire and a contrast agent may be used to confirm the open state of the stenosis.

As described above, in the stent delivery system 1 of the present embodiment, since the slope 71 for guiding the guide wire Gw is located in the inner cylinder 51 of the inner cylinder portion 50, the guide wire Gw is reliably guided by the slope 71. Then, it smoothly comes out of the inner cylinder 51 and the outer cylinder 21. Therefore, the guide wire can be easily inserted while having a monorail structure.

In the delivery catheter described in Patent Document 1, when the inner cylinder member and the outer cylinder member rotate relative to each other around the axis, a phase shift occurs between the slope portion and the inner cylinder member, and the guide wire is provided on the slope portion. Therefore, it becomes impossible to guide the user favorably. In the stent delivery system 1, since the shaft 70 is fixed to the inner cylinder 51, the slope 71 does not rotate relative to the inner cylinder 51 about the axis. Therefore, the slope 71 can always guide the guide wire Gw toward the communication hole 54.

Further, since it is only necessary to connect the shaft 70 on which the slope 71 is formed to the inner cylinder 51 in an appropriate positional relationship, the inner cylinder portion 50 having the slope 71 can be easily formed.

In the above example, an example in which the portion of the inner cylinder 51 on the base end side of the communication hole 54 is tubular has been described, but in the inner cylinder 51, a region within a certain range from the base end 53 is shown in FIG. It may be in the shape of a half pipe. In this way, the inner cylinder 51 and the shaft 70 can be easily joined, and the position of the inner cylinder 51 and the shaft 70 can be easily adjusted in the circumferential direction. Further, since the base end portion of the communication hole of the inner cylinder portion is formed by the shaft, the size of the communication hole in the longitudinal direction of the inner cylinder 51 can be freely adjusted by changing the joining position between the inner cylinder 51 and the shaft 70. Can be changed.

The second embodiment of the present invention will be described with reference to FIGS. 6 to 11. In the following description, the same reference numerals will be given to the configurations common to those already described, and duplicate description will be omitted.

FIG. 6 shows a part of the inner cylinder portion 150 according to the present embodiment. No slope is provided at the tip of the shaft 70. The tip of the shaft 70 is joined to the inner cylinder 51 at a position closer to the base end than the communication hole 54.

A guide member 81 having a slope 82 is attached to the inside of the inner cylinder 51. The guide member 81 of the present embodiment has a shape in which one end of a cylinder is cut off diagonally. The material of the guide member 81 is not limited as long as it has a rigidity sufficient to receive the incoming guide wire.

Similar to the first embodiment, the stent delivery system of the present embodiment provided with the inner cylinder portion 150 also has an effect that the guide wire can be easily inserted while having a monorail structure.

In this embodiment, the shape of the guide member 81 can be changed in various ways. First, the basic shape of the guide member 81 is not limited to a cylinder. Therefore, if the gap between the inner cylinder and the inner cylinder is large enough that the guide wire cannot enter and the guide wire does not get caught, and the joint strength with the inner cylinder can be sufficiently secured, the basics of the polygonal prism. It may have a shape.

In addition, the mode of the slope can be changed in various ways.
Like the slope 82A shown in FIG. 7, the slope may be located in the same range as the communication hole 54. In the inner cylinder portion, a part of the outer peripheral surface of the inner cylinder 51 is removed from the portion where the communication hole is formed. Since the outer cylinder portion also has a communication hole at the same position, the portion of the delivery catheter 10 where the communication hole is provided is structurally weaker than the other portions, and buckling or the like is likely to occur. By arranging the slope over the entire range where the communication hole 54 exists in the longitudinal direction of the inner cylinder portion, the communication hole forming site is reinforced, buckling and the like are suppressed, and the pushability (pusher) of the entire stent delivery system is suppressed. Ability) is also improved.
Further, since the amount of the guide member 81 decreases as it approaches the tip, the flexibility of the tip of the delivery catheter 10 catheter is maintained, and the insertability in the body is unlikely to decrease.
The above-mentioned effect is similarly exhibited even if the tip of the slope is located on the tip side of the communication hole. Further, even if the base end of the slope is closer to the tip side than the base end of the communication hole, the same effect can be obtained if the guide member is arranged within the range of the communication hole.

In the example shown in FIG. 8, the inner cylinder 51 is processed, and an auxiliary slope 82b continuous with the slope 82 is formed on the inner cylinder 51. By doing so, it is possible to eliminate the step caused by the wall thickness of the inner cylinder and allow the guide wire to smoothly come out of the inner cylinder portion.
Instead of the example shown in FIG. 8, the guide member 81 may be provided with a slope having a size that reaches the outer peripheral surface of the inner cylinder 51, as in the slope 82C shown in FIG. In the example of FIG. 9, the guide member 81 has a columnar base portion 85 and a large diameter portion 86 having a slope 82C, but the outer peripheral surface of the large diameter portion 86 has sufficient joint strength with the inner cylinder. If it can be secured, it is not necessary to have the base 85.

FIG. 10 shows an example in which a part of the inner cylinder 51 is used as a guide member. For example, a part of the outer peripheral surface of the inner cylinder 51 cut out to form the communication hole 54 is pushed into the lumen of the inner cylinder 51 and fixed to the inner surface of the inner cylinder 51 by heat fusion or adhesion. , The slope 82d can be formed. In this case, it is preferable that a part of the outer peripheral surface pushed into the lumen is connected to the inner cylinder at the position of the base end portion of the communication hole 54 because a step is less likely to occur between the slope 82d and the inner cylinder 51.
In this example, the slope 82d is made of the same material as the inner cylinder 51. The method of forming the slope and the inner cylinder with the same material is not limited to this. For example, the guide member 81 may be made of the same material as the inner cylinder 51. In this case, the guide member 81 and the inner cylinder 51 may be fixed by heat fusion.

The aspects of slopes 82A to 82C shown in FIGS. 7 to 9 can also be applied to the first embodiment. However, in the second embodiment, by forming the guide member by resin molding, metal casting, or the like, various shapes can be easily realized as compared with processing the tip portion of the shaft.

The positional relationship between the side hole 24 of the outer cylinder 21, the communication hole 54 of the inner cylinder 51, and the slope 82 (and the slope 71) will be described with reference to FIG. As shown in FIG. 3, this description is based on a state in which the outer cylinder 21 is in contact with the chip 60. The items described may be combined as appropriate.
The longitudinal distance of the delivery catheter between the anterior end A of the side hole 24 and the posterior end B of the slope 82 and the posterior end C of the communication hole 54 completes the self-expanding stent 100. It is preferable that the sum is equal to or greater than the sum of the relative retreat amount of the outer cylinder portion required for exposure to and the diameter of the guide wire Gw used. In this way, the communication hole 54 is not completely covered by the outer cylinder portion even when the self-expandable stent 100 is expanded. As a result, it is possible to prevent the behavior of the guide wire Gw from being hindered and the guide wire from being damaged by the delivery catheter 10. If there is a gap larger than the diameter of the guide wire between the inner cylinder and the outer cylinder, the guide wire can go out of the delivery catheter even if the communication hole 54 is completely covered by the outer cylinder portion.
It is preferable that the rear end B is in front of the rear end C and the rear end D of the side hole 24 because the guide wire coming out of the communication hole 54 is less likely to be caught.
It is preferable that the rear end C is in front of the rear end D because the guide wire coming out of the side hole 24 is less likely to be caught.

Although each embodiment of the present invention has been described above, the technical scope of the present invention is not limited to the above-described embodiment, and the combination of components may be changed or each component may be changed without departing from the spirit of the present invention. It is possible to make various changes to and delete.
Some changes are illustrated below, but not all, but other changes are possible. These changes may be combined as appropriate.

-As shown in FIG. 12, if the groove 75 is provided on the slope 71 (or the slope 82 or the like), the guide wire can be more reliably directed to the communication hole by the slope. The width and cross-sectional shape of the groove are not particularly limited, but it is preferable that the shape of the inner surface of the groove and the shape of the outer peripheral surface of the guide wire are completely or substantially the same.

As shown in FIG. 13, the outer cylinder 21 has a large diameter portion 21a on the tip end side and a small diameter portion 21b on the base end side, and a side hole 24 may be formed in the small diameter portion 21b. In this way, the large diameter portion 21a can secure a storage space for the self-expandable stent 100. Further, the small diameter portion 21b allows the guide wire and the delivery catheter 10 protruding from the side hole 24 to run in parallel in the channel of the endoscope while suppressing interference, and an increase in the required operating force can be suppressed.
FIG. 14 shows another configuration example in which the guide wire and the delivery catheter can be run side by side while suppressing interference in the channel of the endoscope. In this example, a tapered portion 21c whose outer diameter gradually changes is provided between the large diameter portion 21a and the small diameter portion 21b, and a side hole 24 is formed in the tapered portion 21c. In this way, since the guide wire protrudes toward the base end of the delivery catheter, the behavior of the guide wire coming out of the outer cylinder becomes natural, which is preferable. The dimensions of the tapered portion 21c in the longitudinal direction of the outer cylinder can be appropriately set according to the dimensions of the side holes to be formed and the like.

The present invention is not limited to the delivery catheter described above, and can be applied to various catheters having a monorail structure, such as a contrast catheter having a contrast lumen.

The present invention can be applied to various catheters used through a guide wire.

1 Stent delivery system 10 Delivery catheter (catheter)
20 Outer cylinder 21a Large diameter 21b Small diameter 21c Tapered 24 Side hole 50 Inner cylinder 51 Inner cylinder 54 Communication hole 70 Shaft 71 Slope 71a Slope base end 71b Slope tip 75 Groove 81

Guide members

82, 82A, 82C, 82d Slope 100 Self-expanding stent (stent)

Claims

An inner cylinder including an inner cylinder having a guide wire lumen,
An outer cylinder portion having a side hole on the outer peripheral surface and through which the inner cylinder portion is relatively movable,
With
The inner cylinder
The tip has an opening that communicates with the guide wire lumen.
The outer peripheral surface has a communication hole that communicates with the guide wire lumen.
It has a slope extending from the inner surface of the guide wire lumen toward the communication hole and fixed in the inner cylinder.
The tip of the slope is located closer to the tip of the inner cylinder than the base end of the slope.
catheter.
The tip of the slope and the base end of the slope face each other with the central axis of the inner cylinder interposed therebetween.
The catheter according to claim 1.
The inner cylinder portion further has a shaft having the slope at the tip portion thereof.
The inner cylinder and the shaft are connected by fixing the tip portion in the inner cylinder.
The catheter according to claim 1.
The shaft is arranged so as to include the entire range in which the communication hole is formed in the longitudinal direction of the catheter.
The catheter according to claim 3.
The inner cylinder portion further has a guide member fixed in the inner cylinder.
The guide member has the slope.
The catheter according to claim 1.
The guide member is formed so as to include the entire range in which the communication hole is formed in the longitudinal direction of the catheter.
The catheter according to claim 5.
The slope is made of the same material as the inner cylinder.
The catheter according to claim 1.
The slope is formed to include the entire range in which the communication hole is formed in the longitudinal direction of the catheter.
The catheter according to claim 7.
The slope has a groove extending in a direction toward the communication hole.
The catheter according to claim 1.
The outer cylinder portion
Large diameter part and
It has a diameter smaller than that of the large diameter portion, and has a small diameter portion that extends from the base end of the large diameter portion.
The side hole is formed in the small diameter portion,
The catheter according to claim 1.
The outer cylinder portion
Large diameter part and
A small diameter portion having a diameter smaller than that of the large diameter portion and extending from the base end of the large diameter portion,
It has a tapered portion provided between the large diameter portion and the small diameter portion.
The side hole is formed in the tapered portion,
The catheter according to claim 1.
The rear end of the communication hole is located in front of the rear end of the side hole.
The rear end of the slope is located in front of the rear end of the communication hole,
The catheter according to claim 1.
A delivery catheter having an inner cylinder portion including an inner cylinder having a guide wire lumen, and an outer cylinder portion having a side hole on the outer peripheral surface and through which the inner cylinder portion is relatively movable.
A stent housed in a gap between the inner cylinder and the outer cylinder,
With
The inner cylinder
The tip has an opening that communicates with the guide wire lumen.
The outer peripheral surface has a communication hole that communicates with the guide wire lumen.
It has a slope extending from the inner surface of the guide wire lumen toward the communication hole and fixed in the inner cylinder.
The tip of the slope is located closer to the tip of the inner cylinder than the base end of the slope.
The stent is housed on the distal side of the side hole and the communication hole.
Stent delivery system.
The outer cylinder portion
The large diameter part in which the stent is housed and
It has a diameter smaller than that of the large diameter portion, and has a small diameter portion that extends from the base end of the large diameter portion.
The side hole is formed in the small diameter portion,
The stent delivery system according to claim 13.
The outer cylinder portion
The large diameter part in which the stent is housed and
A small diameter portion having a diameter smaller than that of the large diameter portion and extending from the base end of the large diameter portion,
It has a tapered portion provided between the large diameter portion and the small diameter portion.
The side hole is formed in the tapered portion,
The stent delivery system according to claim 13.
In the state where the stent is housed,
The rear end of the communication hole is located in front of the rear end of the side hole.
The rear end of the slope is located in front of the rear end of the communication hole,
The stent delivery system according to claim 13.