JP2018064866A - Catheter pushing-in support tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter pushing-in support tool that can enhance force transmission property in a handling part of a shaft.SOLUTION: A catheter pushing-in support tool 1 includes a tube body part 10 covering a shaft 20 of a catheter 2, where the tube body part 10 is formed of a hard material harder than the shaft 20. The catheter pushing-in support tool 1 has a hole part 11 for applying pressure to the shaft 20 with a finger. The hole part 11 is axially long relative to the length thereof in a circumferential direction of the tube body part 10. A plurality of hole parts is provided in an axial direction of the tube body part 10.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a catheter pushing aid that is attached to a shaft when a catheter is inserted into a living body lumen.

  A catheter is widely used as a medical device for diagnosis in a body lumen and improvement of a lesion (stenosis). The catheter has a long shaft, and a diagnostic device and a treatment device are provided at the tip.

  The shaft is required to be flexible in order to be deformed in accordance with the bent portion and branch portion of the living body lumen and to pass smoothly. For this reason, the shaft is formed of a flexible material. On the other hand, the shaft is also required to have a pushability that is a property of transmitting a pushing force from the proximal end side to the distal end side. In order to make these compatible, for example, in Patent Document 1, a shaft is made flexible, and a reinforcing body made of a wire is provided thereon.

JP2013-90820A

  The shaft is pushed in manually by the operator from the proximal side. For this reason, the pushability of the shaft is improved by reliably transmitting the force along the axial direction at the proximal portion, which is the portion that the operator pushes in with the hand. Therefore, it is desired to improve the force transmission at the proximal portion of the shaft.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a catheter push-in assisting tool that can enhance the force transmission at the proximal portion of the shaft.

A catheter pushing aid according to the present invention that achieves the above object is a catheter pushing aid having a tube part covering a shaft of a catheter,
The tube part is formed of a material harder than the shaft and has a hole for applying a finger pressure to the shaft.

  The catheter pushing aid configured as described above is made of a material harder than the shaft, and can impart thickness to the shaft, so that the rigidity of the pushing portion of the shaft can be increased. In addition, since the catheter pushing assist tool has a hole, and the finger pressure can be applied to the shaft through the hole, the catheter pushing assist tool and the shaft are firmly held by the operator at the same time and inserted. be able to. For this reason, the pushability of the shaft to be inserted can be improved.

  Moreover, the hole is longer in the axial direction than the circumferential direction of the tubular body. As a result, it is possible to make it easier to put a finger on the hole, and it is possible to increase the retention of the catheter pushing aid.

  A plurality of the hole portions are provided in the axial direction of the tubular body portion. Thereby, the position where an operator can put a finger on the catheter pushing assist tool increases, and the operability can be further improved.

  Moreover, the said tube part has a base end taper part where the internal diameter of a base end part becomes large toward the base end side. Thereby, a proximal end taper part can be engaged with the anti-kink protector of a catheter, and when not using a catheter pushing-in aid, it can prevent from getting in the way of a procedure.

  Moreover, the said tubular-body part has a slit part over an axial direction full length. Thereby, a tubular-body part can be attached with respect to a shaft by retrofit.

  Further, if the hole is covered with a film-like body, the operator can be prevented from touching the shaft directly.

It is a front view of a balloon catheter. It is an expanded sectional view near the front-end | tip part of a balloon catheter. It is a perspective view of a catheter pushing-in aid. It is sectional drawing showing the state which spreads a catheter pushing-in assistance tool in a slit part, and is attached to a shaft. It is sectional drawing showing the state which grasped the catheter pushing auxiliary tool attached to the shaft with the finger | toe. It is a perspective view showing the state which grasped the catheter pushing auxiliary tool attached to the shaft with a finger. It is a front view of the catheter pushing aid of the 2nd form. It is a front view of the state which fixed the catheter pushing-in aid of the 2nd form to the anti-kink protector.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the dimension ratio of drawing is exaggerated on account of description, and may differ from an actual ratio. Further, in this specification, the side of the catheter 2 that is inserted into the living body lumen is referred to as the “distal end” or “distal end side”, and the proximal side for operation is referred to as “proximal end” or “proximal end side”.

  The catheter pushing aid 1 according to this embodiment is used when the balloon catheter 2 is inserted into a living body lumen. First, the balloon catheter 2 will be described. As shown in FIG. 1, the balloon catheter 2 has a long shaft 20, a balloon 21 provided at the distal end portion of the shaft 20, and a hub 22 provided at the proximal end portion of the shaft 20. As shown in FIG. 2, the shaft 20 has an outer tube 30 and an inner tube 31 that are each formed in a long hollow shape and are arranged concentrically. The inner diameter of the outer tube 30 is larger than the outer diameter of the inner tube 31, and the inner tube 31 is housed in the hollow interior of the outer tube 30. The hollow interior of the inner tube 31 forms a guide wire lumen 33 through which the guide wire 23 is inserted. Further, an expansion lumen 32 through which the expansion fluid of the balloon 21 is circulated is formed inside the hollow of the outer tube 30 and outside the inner tube 31.

  The guide wire 23 is inserted into the guide wire lumen 33 from the opening 20 a at an intermediate position in the axial direction of the shaft 20. The inner tube 31 is provided only on the tip side of the opening 20a. This balloon catheter 2 is a so-called rapid exchange type catheter.

The inner tube 31 protrudes further to the distal end side than the distal end of the outer tube 30. The balloon 21 has a proximal end portion fixed to the distal end portion of the outer tube 30 and a distal end portion fixed to the distal end portion of the inner tube 31. Thereby, the inside of the balloon 21 communicates with the expansion lumen 32. The balloon 21 is expanded by injecting an expansion fluid through the expansion lumen 32. The expansion fluid may be a gas or a liquid. For example, a gas such as helium gas, CO ₂ gas, or O ₂ gas, or a liquid such as physiological saline or a contrast agent can be used.

  The outer tube 30 and the inner tube 31 are preferably formed of a material having a certain degree of flexibility. Examples of such a material include polyolefins such as polyethylene, polypropylene, polybutene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer, or a mixture of two or more thereof, soft polyvinyl chloride resin, Examples thereof include fluororesins such as polyamide, polyamide elastomer, polyester, polyester elastomer, polyurethane, polytetrafluoroethylene, silicone rubber, and latex rubber. The balloon 21 is formed of a flexible material, like the outer tube 30 and the inner tube 31.

  As shown in FIG. 1, a catheter pushing aid 1 is provided on the proximal side portion of the shaft 20. The catheter pushing aid 1 has a tube part 10 that covers the shaft 20, and can slide along the axial direction of the shaft 20. For this reason, the tube part 10 is formed to have an inner diameter that is equal to or slightly larger than the outer diameter of the shaft 20. The catheter pushing aid 1 is made of the same material as the shaft 20 and has flexibility. The material for the catheter pushing aid 1 is selected so as to be harder than the shaft 20.

  The catheter pushing aid 1 will be described in detail. As shown in FIG. 2, the tube body portion 10 of the catheter pushing aid 1 is formed in a tubular shape having a certain length in the axial direction, and a plurality of hole portions 11 are formed on the peripheral surface thereof. Yes. The hole portion 11 has a rectangular shape that is long in the axial direction of the tubular body portion 10. The size of the hole 11 is set such that when the operator holds the tube body part 10 by hand, the finger is applied to the shaft 20 covered by the tube body part 10. Specifically, the axial length of the hole 11 is 5 to 15 mm, and the circumferential length is 2 to 5 mm. A plurality of hole portions 11 are formed in the axial direction and the circumferential direction of the tube body portion 10, respectively.

  A slit portion 12 is also formed in the tubular body portion 10 along the axial direction. The slit portion 12 is formed so as to extend over the entire axial length of the tubular body portion 10. The tube part 10 can be opened in the circumferential direction by the slit part 12. As shown in FIG. 4, the catheter pushing aid 1 can be attached later to the shaft 20 by opening the slit portion 12 in the circumferential direction.

  When the catheter pushing aid 1 is attached to the shaft 20, as shown in FIG. 5, when the operator holds the catheter pushing aid 1 with the finger 50, the finger pressure is directly applied to the shaft 20 with the finger 50 through the hole 11. Can be applied. When the shaft 20 is inserted into the living body lumen, as shown in FIG. 6, the catheter pushing aid 1 is picked with the finger 50 and inserted in the axial direction. Since the catheter pushing aid 1 increases the thickness of the shaft 20 and is formed of a hard material, the catheter pushing aid 1 covers the shaft 20 to increase the rigidity of the pushing portion of the shaft 20. can do. Moreover, since the catheter pushing assisting tool 1 has the hole part 11 and can apply a finger pressure to the shaft 20 through the hole part 11, the operator firmly holds the catheter pushing assisting tool 1 and the shaft 20 at the same time. Above, an insertion can be made. For this reason, the pushability of the shaft 20 to be inserted can be improved.

  Since the catheter pushing aid 1 is slidable along the axial direction of the shaft 20, when the shaft 20 is inserted to some extent, the catheter pushing aid 1 is moved to the proximal end side of the shaft 20, and the shaft 20 is continued. You can continue to insert.

  By using such a catheter push-in assisting tool 1, even when the shaft 20 of the balloon catheter 2 has high flexibility, pushability during insertion into a living body lumen can be improved. That is, according to the catheter pushing aid 1 of the present embodiment, the shaft 20 is deformed in accordance with these at the bent portion or branch portion of the living body lumen, and the flexibility for smoothly passing can be increased. .

  In the present embodiment, the hole portion 11 penetrates the inside and outside of the tubular body portion 15, but the surface of the hole portion 11 may be covered with a film-like body such as a film. Thereby, it is possible to prevent the operator's finger holding the catheter pushing aid 1 from directly touching the shaft 20.

  Next, the catheter pushing aid 5 of the second form will be described. As shown in FIG. 7, the catheter pushing aid 5 of the second form has a tube portion 15 that covers the shaft 20, and the inner diameter is closer to the proximal end side than the tube portion 15 toward the proximal end side. The base end taper portion 17 is increased. The tubular body portion 15 has a plurality of holes 16 on the peripheral surface, similar to the catheter pushing aid 1 of the first embodiment.

  The proximal end taper portion 17 has a shape that can be engaged with the distal end portion of the anti-kink protector 22 a provided at the distal end portion of the hub 22. As shown in FIG. 8, when the proximal end taper portion 17 is engaged with the distal end portion of the kink protector 22a, the catheter pusher assisting tool 5 is fixed to the kink protector 22a when the catheter pusher assisting tool 5 is not used. You can keep it out of the way.

  As described above, the catheter pushing aid 1 according to this embodiment is the catheter pushing aid 1 having the tube portion 10 that covers the shaft 20 of the catheter 2, and the tube portion 10 is harder than the shaft 20. It is made of a material and has a hole 11 for applying finger pressure to the shaft 20. Since this catheter pushing aid 1 is formed of a material harder than the shaft 20, the rigidity at the pushing portion of the shaft 20 can be increased. Moreover, since the catheter pushing assisting tool 1 has the hole part 11 and can apply a finger pressure to the shaft 20 through the hole part 11, the operator firmly holds the catheter pushing assisting tool 1 and the shaft 20 at the same time. Above, an insertion can be made. For this reason, the pushability of the shaft 20 to be inserted can be improved.

  Further, the hole 11 is longer in the axial direction than the circumferential direction of the tubular body 10. Thereby, it can be made easy to put a finger on the hole 11, and the retainability of the catheter pushing aid 1 can be increased.

  A plurality of hole portions 11 are provided in the axial direction of the tube body portion 10. Thereby, the position where an operator can put a finger on the catheter pushing-in assisting tool 1 increases, and the operability can be further improved.

  Moreover, the tube part 15 has the base end taper part 17 from which the internal diameter of a base end part becomes large toward a base end side. As a result, the proximal taper portion 17 can be engaged with the kink protector 22a of the catheter 2 so that it does not interfere with the procedure when the catheter pushing aid 15 is not used.

  Moreover, the tube part 10 has the slit part 12 covering an axial direction full length. Thereby, the tube part 10 can be attached to the shaft 20 later.

  Further, if the hole 11 is covered with a film-like body, the operator can be prevented from touching the shaft 20 directly.

  Note that the present invention is not limited to the above-described embodiments, and various modifications can be made by those skilled in the art within the technical idea of the present invention. For example, the length of the catheter pushing aid 1 and the size, shape, number, etc. of the holes 11 can be appropriately set as necessary. Further, the catheter pushing aid 1 can be used not only for the balloon catheter 2 but also for other types of catheters such as a guiding catheter and a diagnostic imaging catheter.

DESCRIPTION OF SYMBOLS 1 Catheter pushing aid 2 Balloon catheter 5 Catheter pushing aid 10 Tubular part 11 Hole part 12 Slit part 15 Tubular part 16 Hole part 17 Base end taper part 20 Shaft 21 Balloon 22 Hub 22a Anti-kink protector 23 Guide wire 30 Outside Pipe 31 Inner pipe 32 Expansion lumen 33 Guide wire lumen

Claims (6)

A catheter pushing aid having a tube part covering the shaft of the catheter,
The said tube part is a catheter pushing aid which has a hole for applying a finger pressure with respect to the said shaft while being formed with the material harder than the said shaft.   The catheter pushing aid according to claim 1, wherein the hole is longer in the axial direction than the circumferential direction of the tubular body.   The catheter pushing aid according to claim 1 or 2, wherein a plurality of the hole portions are provided in the axial direction of the tube body portion.   The catheter pushing aid according to any one of claims 1 to 3, wherein the tubular body portion has a proximal end tapered portion in which an inner diameter of the proximal end portion increases toward the proximal end side.   The catheter pushing aid according to any one of claims 1 to 4, wherein the tubular body portion has a slit portion extending over the entire length in the axial direction.   The catheter pushing aid according to any one of claims 1 to 5, wherein the hole is covered with a film-like body.

Images