JP2011255001A - Catheter auxiliary tool and catheter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catheter auxiliary tool which allows use of a catheter having a diameter larger than the size of a currently used guide wire without changing the guide wire.SOLUTION: The catheter auxiliary tool 19 has a guide wire lumen 10 smaller in diameter than a guide wire lumen 40 of a catheter 49. The auxiliary tool is inserted to the guide wire lumen 40 of the catheter 49, whereby deterioration of operability can be prevented even if the size of the guide wire 61 of the catheter 49 to be used is differed.

Description

  The present invention relates to a catheter assisting device and the like attached to a medical catheter or the like.

  Catheters are widely used to treat or dilate lesions in the body vessel. Examples of the catheter include a high-speed exchange type catheter in which a guide wire lumen exists in a part of a shaft tube, and an over-the-wire type catheter in which a guide wire lumen exists in the entire shaft tube.

  Further, the stent is arranged in a reduced diameter in a catheter called a delivery catheter, and is expanded after being inserted into the body along the guide wire.

  Similarly, a penetrating catheter or a suction catheter is inserted into the body along the guide wire.

  These catheters include a correspondingly sized guidewire lumen and are used with a guidewire of a size suitable for each catheter. Currently, 0.014 inch is widely used as the guide wire size for catheters for treating coronary arteries, and there are many other catheters compatible with 0.014 inch guide wires.

  On the other hand, a guide wire having a large diameter of 0.018 inches or 0.035 inches is used in addition to 0.014 inches for the treatment of peripheral blood vessels or other vascular vessels in the body.

  Since the treatment of the catheter is performed by inserting into the body, it is desired that the catheter profile has a smaller diameter. Therefore, in the case of the coronary artery, 0.014 inch is the mainstream, but a smaller diameter is desired, and a 0.010 inch guide wire has been developed.

  Currently, 0.010 inch guidewire compatible catheters are also used for coronary arteries, but 0.010 inch compatible catheters are not yet available, and only guide catheters and balloon catheters exist, and stent delivery catheters exist. do not do.

  Therefore, in the treatment of the lesioned part, even if the treatment is performed with the 0.010 inch guide wire, only the balloon catheter is provided. When stent treatment is necessary after the treatment of the balloon catheter, the guide wire is set to 0.014 inch. Or a 0.014 inch compatible stent delivery catheter over a 0.010 inch guidewire.

  Then, when replacing the guide wire with 0.014 inch, it takes time to pass the guide wire through the body again. On the other hand, when a stent delivery catheter compatible with 0.014 inch is passed through a 0.010 inch guide wire, the guide wire lumen of the stent delivery catheter compatible with 0.014 inch and the guide wire of 0.010 inch A clearance occurs. Therefore, the guide wire bends in the guide wire lumen, and the transmission force in the long axis direction of the catheter is difficult to be transmitted.

  In addition, when a 0.010 inch guide wire is too flexible for a bent part in the body and a catheter corresponding to 0.014 inch is passed through, the catheter bends outward and the transmission force of the hand part is not transmitted. Occurs.

  In addition, the step between the 0.010 inch guide wire and the 0.014 inch catheter tip tip opening deteriorates the followability between the tip tip and the guide wire, and the tip tip opening is pulled in the blood vessel. The problem of hanging also arises.

  By the way, the following patent documents disclose a technique for inserting an auxiliary tool into a catheter. For example, in Patent Document 1, a catheter is inserted into a guiding catheter, and a guide wire is passed through the lumen of the catheter. Further, in the lumen, the guide wire is passed through the auxiliary tool (the catheter and the auxiliary tool are used as a catheter assembly, and the catheter assembly and the guide wire are used as a catheter set).

  Next, the device is inserted into the body, and the assisting device advances ahead of the catheter. After entering or expanding the stenosis, the assisting device is removed. In this technique, the distal end portion of the auxiliary tool disposed between the catheter and the guide wire has a tapered shape so that there is no step between the catheter and the guide wire.

  Also in Patent Document 2, as in Patent Document 1, a technique is disclosed in which a catheter is inserted into a guiding catheter, an auxiliary tool is introduced therein, and a step with the guide wire is eliminated. .

JP 2008-142351 A JP 2009-291557 A

  However, in Patent Documents 1 and 2, there is no description regarding the case of using a guide wire having a smaller diameter than the guide wire suitable for the catheter, and a technique similar to that of the auxiliary tool used when using a double guiding catheter. It is only about. That is, it is not a document for the purpose of using the auxiliary tool when a size other than the corresponding guide wire of the catheter is used.

  It is an object of the present invention to provide a catheter assisting device or the like that can use a guidewire in use as it is and can use a catheter having a larger diameter than the guidewire when the guidewire size needs to be changed during treatment. is there.

  The catheter assisting tool is detachably used with respect to the catheter including the first guide wire lumen. In this catheter assisting tool, at least one tube placed in the first guide wire lumen is included. The tube has a second guide wire lumen having a smaller diameter than the first guide wire lumen.

  Also, at both ends of the tube, if one end side is the distal end side and the other end side is the proximal end side, the most distal end side of the tube becomes the outer end as it goes to the distal end side. It is preferable that a reduced diameter part that reduces the diameter is included.

  Further, when the catheter assisting tool is attached to the catheter, it is preferable that the reduced diameter portion is located further on the distal end side than the distal end portion of the catheter which is a part of the most distal end.

  In addition, when one end side is a distal end side and the other end side is a proximal end side at both ends of the tube, the most proximal end side of the tube is moved outward toward the proximal end side. It is preferable that a diameter-enlarged portion that expands the diameter is included.

  When the catheter auxiliary tool is attached to the catheter, it is preferable that the enlarged diameter portion includes an engagement mechanism that engages with the distal end portion of the catheter that is a part of the most proximal end of the catheter.

  Further, a catheter unit including the above catheter assisting tool and a catheter attached to the catheter assisting tool can be said to be the present invention.

  According to the present invention, after a small diameter catheter and a small diameter guide wire are used in order to reduce the burden on the patient in the treatment, even if it is necessary to use a larger diameter catheter, Large diameter catheters can also be used without changing the guidewire size.

FIG. 3 is a perspective view of a catheter aid. Fig. 2 is a longitudinal sectional view of a catheter assisting device FIG. 3 is a longitudinal sectional view showing a state where a catheter auxiliary tool is mounted on a catheter (note that the catheter is an over-the-wire type balloon catheter). FIG. 3 is a longitudinal sectional view showing a state where a guide wire is inserted into a catheter equipped with a catheter assisting tool (note that the catheter is an over-the-wire type balloon catheter, and a transverse sectional view is also shown). . FIG. 3 is a longitudinal sectional view showing a state where a guide wire is inserted into a catheter not equipped with a catheter assisting tool (the catheter is an over-the-wire type balloon catheter). FIG. 3 is a longitudinal sectional view of a catheter auxiliary tool. FIG. 7 is a longitudinal sectional view showing a catheter to which the catheter assisting tool shown in FIG. 6 is attached (note that the catheter is an over-the-wire type balloon catheter). FIG. 3 is a longitudinal sectional view of a catheter auxiliary tool. FIG. 9 is a longitudinal sectional view showing a catheter to which the catheter assisting tool shown in FIG. 8 is attached (the catheter is an over-the-wire type balloon catheter). FIG. 3 is a longitudinal sectional view of an over-the-wire type balloon catheter (note that a transverse sectional view is also shown). FIG. 3 is a longitudinal sectional view of a high-speed exchange type balloon catheter. FIG. 3 is a longitudinal sectional view of an over-the-wire balloon expandable stent delivery catheter. FIG. 3 is a longitudinal sectional view of a high-speed exchange type balloon expandable stent delivery catheter. FIG. 2 is a longitudinal sectional view of an over-the-wire penetrating catheter. FIG. 3 is a longitudinal sectional view of a high-speed exchange type penetrating catheter. FIG. 3 is a longitudinal sectional view of a suction catheter. FIG. 3 is a longitudinal sectional view showing a state where a guide wire is inserted into a catheter equipped with a catheter assisting tool (note that the catheter is a high-speed exchange type balloon catheter). FIG. 3 is a longitudinal sectional view showing a state where a guide wire is inserted into a catheter not equipped with a catheter assisting tool (the catheter is a high-speed exchange type balloon catheter). FIG. 3 is a longitudinal sectional view showing a state in which a guide wire is inserted into a catheter equipped with a catheter assisting tool (the catheter is an over-the-wire type balloon expandable stent delivery catheter). FIG. 3 is a longitudinal sectional view showing a state where a guide wire is inserted into a catheter equipped with a catheter assisting tool (the catheter is a high-speed exchange type balloon expandable stent delivery catheter). FIG. 3 is a longitudinal sectional view showing a state in which a guide wire is inserted into a catheter equipped with a catheter assisting tool (the catheter is an over-the-wire penetrating catheter). FIG. 3 is a longitudinal sectional view showing a state where a guide wire is inserted into a catheter equipped with a catheter assisting tool (the catheter is a high-speed exchange type penetrating catheter). FIG. 3 is a longitudinal sectional view showing a state where a guide wire is inserted into a catheter equipped with a catheter assisting tool (the catheter is a suction catheter). FIG. 3 is a longitudinal sectional view showing a state where a guide wire is inserted into a catheter equipped with a catheter assisting tool (note that the catheter is a high-speed exchange type balloon catheter). FIG. 5 is a transverse sectional view showing a state where a guide wire is inserted into a catheter equipped with a catheter assisting tool. FIG. 5 is a transverse sectional view showing a state where a guide wire is inserted into a catheter equipped with a catheter assisting tool. FIG. 3 is a cross-sectional view of a dual lumen catheter. FIG. 5 is a cross-sectional view showing a state where a guide wire is inserted into a dual lumen catheter equipped with a catheter assisting tool.

[Embodiment 1]
The following describes one embodiment with reference to the drawings. For convenience, hatching, member codes, and the like may be omitted, but in such a case, other drawings are referred to.

<About the catheter to which the catheter auxiliary device is attached>
Hereinafter, embodiments of the catheter assisting device will be described with reference to the drawings. The catheter assisting tool is used for, for example, an over-the-wire type balloon catheter 49 as shown in FIG. 10 or a high-speed exchange type balloon catheter 49 as shown in FIG. Is not only a longitudinal sectional view along the longitudinal direction of the catheter 49 but also a vertical sectional view (transverse sectional view) with respect to the longitudinal direction of the catheter 49}.

  Further, the catheter assisting tool is an over-the-wire type balloon expandable stent delivery catheter 49 as shown in FIG. 12 or a high-speed exchange type balloon expandable stent delivery catheter 49 as shown in FIG. Also used.

  Although not shown, the catheter assisting tool is also used in the self-expanding stent delivery system.

  The catheter assisting tool is also used for an over-the-wire penetrating catheter 49 as shown in FIG. 14 or a high-speed exchange penetrating catheter 49 as shown in FIG.

  The catheter assisting tool is also used for a suction catheter 49 as shown in FIG.

  In short, a catheter assisting tool is used for a catheter 49 that is inserted into a blood vessel, an esophagus, a trachea, a urethra, or a vessel such as a bile duct, and used to treat or expand the inside of the tube.

  The member number 40 indicates the guide wire lumen [first guide wire lumen] 40 of the catheter 49.

  The member number 41 and the member number 42 indicate the outer tube 41 and the inner tube 42 included in the shaft tube in the catheter 49. Further, the member number 43 indicates the intermediate tube 43 included in the shaft tube, and the member number 44 indicates the distal end tip [catheter distal end] 44 that is the distal end of the shaft tube.

  The member number 45 indicates a manifold [catheter end portion] 45, and the member number 46 indicates a hub [catheter end portion] 46. Member number 51 indicates a balloon, and member number 52 indicates a stent.

<Configuration and structure of catheter assistive device>
FIG. 1 is a perspective view of the catheter assisting device 19, and FIG.

  The catheter assisting device 19 includes a tube 11 having an outer diameter that can be accommodated in the guide wire lumen 40 of the catheter 49 described above (of course, the guide wire lumen [second guide wire lumen] 10 included in the catheter assisting device 19). Has a smaller outer diameter than the guidewire lumen 40 of the catheter 49).

  Therefore, the catheter assisting device 19 can be attached to or detached from the guide wire lumen 40 (and thus the catheter 49) of the catheter 49 (in short, the catheter assisting device 19 includes the catheter 49 (specifically, the guide wire lumen 40). Is detachable with respect to}.

  In the following, at both ends of the tube 11 or the catheter 49, one end side is the distal end side and the other end side is the proximal end side (note that the distal end side is the side close to the lesioned part) And the proximal end side is the side closer to the operator's hand).

  Further, in the catheter assisting tool 19, the most proximal end side of the tube 11 includes an enlarged diameter portion 12 having an outer diameter that is larger than the outer diameter of the tube 11 toward the proximal end side.

  When the catheter assisting tool 19 is inserted into the guide wire lumen 40 of the catheter 49 as shown in FIG. 3, the enlarged diameter portion 12 seems to be caught by the tapered inner shape of the manifold 45 of the catheter 49. Shape. For example, if the inner shape of the manifold 45 is tapered toward the proximal end side, the enlarged diameter portion 12 is also preferably tapered toward the proximal end of the tube 11.

  If such an enlarged diameter portion 12 is included in the catheter assisting tool 19, the enlarged diameter portion 12 is caught by the manifold 45 of the catheter 49, and the catheter assisting tool 19 does not fall off from the catheter 49 (in essence, When the catheter assisting tool 19 is attached to the catheter 49, the shape of the enlarged diameter portion 12 is such that only the catheter assisting tool 19 is a stopper that does not precede the catheter 49. Not particularly limited).

  In addition, this diameter expansion part 12 may be integrally formed in the edge part of the pipe | tube 11, for example using the core material which has a taper shape. Moreover, it is not limited to this, For example, the enlarged diameter part 12 itself is formed by well-known techniques, such as injection molding, and the formed enlarged diameter part 12 and the pipe | tube 11 are joined by heat melting or an adhesive agent, for example. May be.

  And the state by which the guide wire 61 was inserted with respect to the catheter 49 which mounted | wore with the above catheter auxiliary tools 19 is shown by FIG. That is, the guide wire 61 is inserted into the guide wire lumen 10 of the catheter auxiliary tool 19 attached to the catheter 49.

  As is apparent from a comparison between FIG. 5 which is a comparative example and FIG. 4 described above, in the comparative example, the clearance between the guide wire 61 and the guide wire lumen 40 of the catheter 49 is the guide wire 61 in FIG. The guide wire 61 has a smaller diameter than the guide wire 61 corresponding to the coaxial type catheter 49 (see FIGS. 4 and 5). Indicates the used state).

  The comparative example shown in FIG. 5 will be specifically described. For example, when a catheter 49 corresponding to 0.014 inch is passed through a guide wire 61 of 0.010 inch, the guide wire lumen 40 of the catheter 61 corresponding to 0.014 inch, the guide wire 61 of 0.010 inch, There is a relatively large clearance between the two.

  Therefore, the guide wire 61 bends within the guide wire lumen 40, and the transmission force in the major axis direction (longitudinal direction) of the catheter 49 becomes difficult to be transmitted. Also, because the 0.010 inch guide wire 61 is too flexible with respect to the bent part in the body, when the catheter 49 for 0.014 inch is passed, the guide wire 61 bends outward and the hand portion The transmission power of is not transmitted.

  Further, a step is generated between the 0.010 inch guide wire 61 and the opening of the distal end portion (tip tip 44) of the catheter 49 corresponding to 0.014 inch, and the followability between the tip tip 44 and the guide wire 61 is improved. Unfortunately, there arises a problem that the opening of the tip 44 is caught in the blood vessel.

  However, as shown in FIG. 4, for example, when a 0.014 inch catheter 49 fitted with the catheter assisting tool 19 is passed through a 0.010 inch guide wire 61, it corresponds to 0.014 inch. Clearance is less likely to occur between the guide wire lumen 40 of the catheter 49 and the 0.010 inch guide wire 61. Therefore, the problem that occurs in the comparative example does not occur.

  As shown in FIG. 1, a part of the tube 11 protruding from the opening on the distal end side (distal end side) of the catheter 49, that is, in the catheter auxiliary tool 19, As it goes toward the distal end side, a reduced-diameter portion 13 whose outer diameter is reduced (reduced) is included rather than the outer diameter of the tube 11 (in short, the reduced-diameter portion 13 is more than the distal end of the catheter 49). And further on the distal end side).

  More specifically, the diameter-reduced portion 13 that is the distal end portion of the tube 11 is continuously tapered so as to follow the shape of the distal end tip 44 of the catheter 49 by, for example, becoming a tapered shape. This is because the reduced diameter portion 13 of the catheter auxiliary tool 19 is less likely to get caught in the blood vessel.

  The diameter-reduced portion 13 is formed by, for example, covering the tip of the tube 11 with a heat shrinkable tube and heating it. More specifically, the reduced diameter portion 13 is formed integrally with the tube 11 by thermally melting the tube 11 due to the reduced diameter of the heated heat-shrinkable tube.

  However, the present invention is not limited to this. For example, the reduced diameter portion 13 itself is formed by a known technique such as injection molding, and the formed reduced diameter portion 13 and the tube 11 are joined by, for example, heat melting or an adhesive. May be.

  The shape of the catheter assisting tool 19 is not limited to that shown in FIGS. 1 and 2. For example, as shown in FIG. 6, the thickness of the enlarged diameter portion 12 may be thinner than the thickness of the enlarged diameter portion 12 shown in FIG. 7 shows a state in which the catheter assisting tool 19 of FIG.

  As shown in FIG. 8, the catheter auxiliary tool 19 may be provided with an engagement mechanism 14 that engages with the proximal end (manifold 45) of the catheter 49 instead of the enlarged diameter portion 12 (for example, a luer lock). A mechanism is mentioned as the engagement mechanism 14. In addition, since the catheter auxiliary tool 19 and the catheter 49 can be integrally connected and handled by engaging, the engagement mechanism 14 can also be called the connection mechanism 14).

  FIG. 9 shows a state where the catheter auxiliary tool 19 including the engagement mechanism 14 is attached to the catheter 49.

  The engagement mechanism 14 is formed by a known technique such as injection molding, and the formed engagement mechanism 14 is joined to the tube 11 by heat melting or an adhesive.

<Materials related to catheter aids>
Examples of the material of the tube 11 include polyethylene, polyolefin, polyolefin elastomer, polyester, polyester elastomer, polyamide, polyamide elastomer, polyurethane, polyurethane elastomer, and the like. In addition to the polymer single-layer tube, a multilayer tube in which the above-described materials are stacked, a braided tube or a metal tube, or a composite tube formed by combining them is adopted as the tube 11 of the catheter auxiliary tool 19. It doesn't matter.

  In addition, since the inner surface of the pipe | tube 11 becomes the guide wire lumen 10, it is preferable that the guide wire 61 passes smoothly (In short, the higher the slidability of the guide wire 61 in the guide wire lumen 10 is, the better). Considering this point, it is preferable that the tube 11 is formed of polyethylene, particularly high-density polyethylene.

  Further, when the tube 11 has a multilayer structure, the innermost layer of the tube 11 is formed of high-density polyethylene in order to ensure the slidability of the guide wire 61, and the outermost layer of the tube 11 is the reduced diameter portion 13 and the expanded diameter portion 12. Alternatively, the engaging mechanism 14 may be formed of a material that can be adhered or fused.

  Furthermore, in order to further improve the slidability of the guide wire 61, a lubricious coating such as silicon or polytetrafluoroethylene is applied to the inner surface of the tube 11 (in short, the guide wire lumen 10). It doesn't matter.

  Further, the material of the reduced diameter portion 13 and the enlarged diameter portion 12 is not particularly limited as in the case of the tube 11. Examples of these materials include polyethylene, polyolefin, polyolefin elastomer, polyester, polyester elastomer, polyamide, polyamide elastomer, polyurethane, or polyurethane elastomer. If the reduced diameter portion 13 and the enlarged diameter portion 12 are formed of such a material, the reduced diameter portion 13 and the enlarged diameter portion 12 are easily connected to the pipe 11.

  Examples of the material of the engagement mechanism 14 include polycarbonate, polyamide, polyurethane, polysulfone, polyarylate, styrene-butadiene copolymer, and polyolefin.

<About hydrophilic coating>
The outer surface of the tube 11 is preferably provided with a hydrophilic coating to facilitate insertion into the catheter 49. Further, in the catheter 49, it is preferable that at least a part of the shaft tube in contact with blood is provided with a hydrophilic coating that exhibits lubricity when in contact with blood.

  The hydrophilic coating material is not particularly limited, and examples thereof include hydrophilic polymers such as polyethylene glycol, polyacrylamide, and polyvinylpyrrolidone. Also, the coating method is not particularly limited.

<Installation example of catheter assistive device>
17 and 19 to 24 show a state in which the catheter assisting tool 19 is attached to various catheters 49 and the guide wire 61 is inserted into the guide wire lumen 10 of the catheter assisting tool 19.

  FIG. 18 is a comparative example with respect to FIG. That is, FIG. 18 shows a state where the catheter assisting tool 19 is not attached to the same catheter 49 as in FIG. 17 and the guide wire 61 is inserted into the guide wire lumen 40 of the catheter 49.

<About detailed examples>
A more detailed embodiment of the catheter assisting device 19 will be described (refer to FIG. 19 as a drawing). However, the catheter auxiliary tool 19 is not limited to this embodiment.

(Example)
According to the procedure described below, a catheter assisting tool 19 corresponding to a 0.010 inch guide wire is formed.

  The tube 11 (inner diameter 0.30 mm, outer diameter 0.40 mm) is formed by extrusion molding using high-density polyethylene.

  The reduced diameter portion 13 is formed as follows. A core material having an arbitrary size is passed through the lumen 10 of the tube 11. Then, the heat shrinkable tube is put on the vicinity of the reduced diameter portion 13 (distal end) of the tube 11 and heated, so that the tube 11 melts and the melted portion of the tube 11 is contracted by the shrinkage of the heat shrinkable tube. Is the reduced diameter portion 13.

  The enlarged diameter portion 12 is formed as follows. A tapered core material is inserted into the lumen 10 near the proximal end of the tube 11. And the diameter-expanded part 12 becomes the diameter-expanded part 12 by expanding the inner diameter of the pipe 11 to 0.45 mm.

  A silicon coating is applied to the inner surface of the tube 11.

  Then, the catheter auxiliary tool 19 formed as described above is passed through the guide wire lumen 40 of the stent delivery catheter 49 corresponding to the 0.014 inch guide wire. Further, the enlarged diameter portion 12 is disposed at the entrance portion of the guide wire lumen 40, and the reduced diameter portion 13 is disposed on the distal end side from the distal end tip 44 of the stent delivery catheter 49. Then, a 0.010 inch guide wire was inserted into the guide wire lumen 10 in the catheter assisting device 19.

(Comparative example)
The catheter assisting tool 19 described in the embodiment is not used, and the 0.010 inch guide wire 61 is inserted into the guide wire lumen 40 of the stent delivery catheter 49 corresponding to the 0.014 inch guide wire 61.

(Comparative evaluation on insertability)
Using the formed samples (Examples and Comparative Examples), the operability of insertion into the bending circuit was evaluated. For the evaluation, a guide catheter (Launcher: 6Fr, JL3.5, manufactured by Medtronic), a hemostack valve, and a guide wire (TEN-NYO: manufactured by Kaneka Medix) were placed in water at 37 ° C. A catheter was inserted into the bending circuit, and a system in which water was circulated inside the guide catheter, hemostack valve, and circuit was used. A sample was inserted from the inlet of the hemostack valve, and insertion operability up to the circuit was confirmed.

(Evaluation results)
When the catheter was inserted into the bending circuit, the catheter 49 of the example could be operated without problems. On the other hand, the catheter 49 of the comparative example bends outward at the bent portion, and the hand side force was not completely transmitted. Further, since the clearance between the distal tip 44 of the catheter 49 and the 0.010 inch guide wire is large, a step generated between the guide wire 61 and the distal tip 44 is caught in the circuit.

[Other embodiments]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, as shown in FIG. 24, the catheter assisting device 19 may not have the enlarged diameter portion 12.

  Further, the lumen 10 of the tube 11 becomes the guide wire lumen 10 for the guide wire 61, and the diameter thereof is smaller than that of the guide wire lumen 40 of the catheter 49. However, the inner diameter of the tube 11 is not limited to a small diameter corresponding to a 0.010 inch guide wire, and may be a relatively large diameter such as 0.014, 0.018, 0.035 inch guide wire 61. .

  Also, as shown in FIGS. 25 and 26, in order to fill the clearance between the guide wire 61 and the guide wire lumen 40, which occurs when the guide wire 61 having a diameter smaller than the adaptive guide wire size of the catheter 49 is selected, The tube 11 of the catheter assisting device 19 only needs to have optimal dimensions (inner diameter and outer diameter).

  In the above description, the catheter 49 has only a single lumen 40. However, the present invention is not limited to this. For example, for a catheter (dual lumen catheter) 49 including a plurality of lumens as shown in FIG. The catheter assisting tool 19 may be used (Note that FIG. 28 is a cross-sectional view showing the catheter 49 to which the catheter assisting tool 19 is attached).

  A unit including the catheter assisting tool 19 and the catheter 49 to which the catheter assisting tool 19 is attached is referred to as a catheter unit.

10 Guide wire lumen [2nd guide wire lumen]
DESCRIPTION OF SYMBOLS 11 Pipe | tube 12 Expanded-diameter part 13 Reduced-diameter part 19 Catheter auxiliary tool 40 Guide wire lumen [1st guide wire lumen]
41 Outer tube 42 Inner tube 43 Intermediate tube 44 Tip tip [catheter tip]
45 Manifold [End of catheter]
46 Hub [End of catheter]
49 Catheter 51 Balloon 52 Stent 61 Guide wire

Claims (6)

A catheter aid that is used detachably with respect to a catheter including a first guidewire lumen,
At least one tube placed in the first guidewire lumen is included,
The catheter has a second guide wire lumen having a smaller diameter than the first guide wire lumen. At both ends of the tube, when one end side is the distal end side and the other end side is the proximal end side,
The catheter auxiliary tool according to claim 1, wherein the distal end side of the tube includes a reduced-diameter portion that reduces the outer diameter toward the distal end side. When the catheter aid is attached to the catheter,
The catheter assisting tool according to claim 2, wherein the reduced diameter portion is located further on the distal end side than the catheter tip portion which is a part of the most distal end in the catheter. At both ends of the tube, when one end side is the distal end side and the other end side is the proximal end side,
The catheter auxiliary tool according to any one of claims 1 to 3, wherein a diameter-expanding portion that expands an outer diameter toward the proximal end side is included on the most proximal end side in the tube. When the catheter aid is attached to the catheter,
5. The catheter assisting device according to claim 4, wherein the enlarged diameter portion includes an engagement mechanism that engages with a catheter end portion that is a part of the most proximal end of the catheter. The catheter auxiliary tool according to any one of claims 1 to 5,
A catheter to be attached to the catheter aid,
A catheter unit.

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