JP2012106099A - Insertion assisting tool, catheter assembly, and catheter set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insertion assisting tool which is easily advanced and retreated with respect to a catheter and allows a guide wire to be exchanged even when the insertion assisting tool precedes the catheter, and also to provide a catheter assembly and a catheter set equipped with the same.SOLUTION: The insertion assisting tool 1 has a distal part 2 having a guide wire lumen 10 and a shaft 4 following the distal part 2. In the state where the insertion assisting tool 1 is combined with the catheter 31, a guide wire G is insertable in a residual lumen to be a residual space which eliminates a part occupied by the shaft 4 of the insertion assisting tool 1 from the lumen 32 of the catheter 31 between the distal part 2 of the insertion assisting tool 1 and a distal end of the catheter 31. An opening on a back end side of the distal part 2 of the insertion assisting tool 1 is opened toward the distal end of the catheter 31 so that the guide wire lumen 10 of the distal part 2 of the insertion assisting tool 1 may receive the guide wire G which is inserted in the residual lumen.

Description

  The present invention relates to an insertion assisting tool for assisting insertion of a catheter prior to a catheter, and a catheter assembly and a catheter set having the same.

  As a conventional insertion assisting tool, one described in Patent Document 1 below is known. As described in paragraph 0009 of this document, this insertion assisting tool is inserted to reinforce the catheter over the entire length of the catheter lumen, and is provided with a side hole for a guide wire.

JP-A-8-224313

  In such an insertion aid, since it is inserted for reinforcement over the entire length of the catheter, the insertion aid comes into contact with the entire inner surface of the catheter, and depending on the combination of materials, it is difficult for the insertion aid to advance and retract. Further, a side hole for the guide wire is provided in the insertion aid, and the guide wire inserted into the insertion aid projects from the side hole of the insertion aid in a direction intersecting the axis of the catheter. After inserting the guide wire into the insertion aid and leading the insertion aid to the catheter, the guide wire protruding from the side hole will be caught by the catheter even if you try to pull out the guide wire from the side hole. It is difficult to pull out the guide wire. Further, when the guide wire is pulled out and then newly inserted into the insertion aid, it is necessary to insert the guide wire into the side hole, and it is difficult to insert the guide wire into the insertion aid. In such a configuration of the insertion assisting tool, it is difficult to replace the guide wire while the insertion assisting tool is in front of the catheter.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an insertion assisting tool that can be easily advanced and retracted with respect to a catheter and can exchange a guide wire even if the catheter is preceded.

  In order to achieve the above-mentioned object, the invention according to claim 1 is an insertion assisting tool for assisting insertion of the catheter by passing through the catheter and preceding the catheter, and opening the front and rear. A tapered distal end portion having a guide wire lumen and a shaft continuous to the distal end portion, and the catheter is combined with the distal end opening of the catheter wrapping the proximal end edge of the distal end portion of the insertion assisting tool. In the state where the distal end portion of the assisting device precedes the catheter, the shaft passes through the lumen of the catheter, and the proximal end edge of the shaft protrudes from the proximal end opening of the catheter, the distal end portion of the insertion assisting device, A residual lumen that is a residual space excluding a portion occupied by the shaft of the insertion aid from the lumen of the catheter between the proximal end of the catheter An opening on the rear end side of the distal end portion of the insertion assisting tool so that the guide wire lumen of the distal end portion of the insertion assisting tool can receive the guide wire inserted into the remaining lumen. It is characterized by opening toward the base end.

  In addition to the above-described object, the invention described in claim 2 is intended to prevent a situation in which the blood vessel is damaged when traveling through the blood vessel, and to improve passability and followability by guiding the guide wire to a predetermined position. In order to achieve the above, in the above invention, a soft tip that has a guide wire lumen and is more flexible than the tip is provided at the tip of the tip.

  In addition to the above object, the invention according to claim 3 allows the catheter to be easily inserted without damaging the vessel with the insertion assisting tool, and the insertion assisting tool can be smoothly taken in and out as necessary. In order to achieve the object of providing a catheter assembly in which a guide wire can be easily replaced, the insertion assisting tool and a catheter having a distal end opening that can include the proximal end edge of the distal end of the insertion assisting tool are provided. And a catheter assembly.

  In addition to the above-mentioned object, the invention described in claim 4 is the above-mentioned invention, in order to achieve the object of considering both the passage of the catheter and the degree of the influence on the blood vessel. The portion is harder than the distal end opening of the catheter.

  In order to achieve the object of obtaining the blood perfusion even in combination with the insertion aid, in addition to the above object, the invention described in claim 5 is the above invention, wherein A side hole is provided at the distal end on the base end side.

  In addition to the above object, the invention described in claim 6 allows a guiding catheter as an outer tube to be placed in the central vascular vessel, allows a catheter as an inner tube to be placed in the peripheral vessel, and further passes through the inner tube. In order to achieve the purpose of allowing the guide wire to be exchanged at the time of insertion while improving the performance, a catheter set comprising the catheter assembly and a guiding catheter for receiving the catheter assembly is provided. It is a feature.

  The present invention is an insertion aid having a tapered tip having a guide wire lumen and a shaft continuous therewith, and a catheter assembly and a catheter set having the insertion aid. The guide wire can be easily exchanged, the step between the catheter and the guide wire can be reduced, and the tip of the catheter can be safely and easily moved to the target site. There is an effect that it can be introduced.

It is explanatory drawing of the (a) insertion auxiliary tool and (b) catheter which concern on embodiment of this invention. It is sectional drawing of the front-end edge of (a) insertion assistance tool and (b) catheter which concern on embodiment of this invention. (A) is an expanded sectional view of the front-end | tip part of the insertion assistance tool in FIG. 1, (b) is an expanded sectional view of the shaft extended from the insertion assistance tool in FIG. It is an AA line sectional view of Drawing 3 (a). (A) explanatory drawing of the catheter which concerns on embodiment of this invention, (b) Partial sectional drawing, (c) It is explanatory drawing of the example of a change. It is explanatory drawing of the catheter assembly which concerns on embodiment of this invention. It is a use schematic diagram of the catheter set concerning the embodiment of the present invention.

  Hereinafter, an insertion aid according to an embodiment of the present invention will be described with reference to the drawings as appropriate. FIG. 1 (a) is an explanatory view of the insertion assisting tool 1. The insertion assisting tool 1 has a distal end portion 2 on the distal end side, and a shaft occupying most of the length on the proximal end side from this. 4. The insertion assisting tool 1 is inserted into the catheter 31 with a part of the tapered portion 12 protruding from the distal end side opening of the catheter 31 to be described later and the proximal end of the shaft 4 protruding from the proximal end opening of the catheter 31. The length of the tip 2 is about 200 millimeters (mm), and the length of the shaft 4 (excluding the overlapping portion with the tip 2) is about 1300 mm. is there.

  FIG. 2A is a central cross-sectional view of the distal end portion 2, and the distal end portion 2 is a tubular body, and has a lumen 10 for the guide wire G that opens earlier and later. The tip 2 has a tapered tip 12 on the tip side. A cylindrical marker 14 that does not transmit radiation (X-rays) is provided immediately after the tapered portion 12. The outer surface of the marker 14 is continuous with the outer surface of the distal end portion 2 on the proximal end side from the marker 14. The outer diameter of the outer surface of the marker 14 and the outer surface of the distal end portion 2 on the rear side thereof may be almost the same as the diameter of the distal end side opening of the catheter 31 described later. Specifically, a 5Fr (French) catheter is used. That is, the outer diameter of the outer surface of the marker 14 and the outer surface of the distal end portion 2 on the rear side (base end side) thereof is 1.40 to 1.50 mm.

  A tubular soft tip 20 that is more flexible than the distal end portion 2 is connected to the distal end side of the tapered portion 12. This connection is made by welding the soft tip 20 to the tip 2. The soft tip 20 also has a lumen 22 for the guide wire G. The lumen 22 has the same diameter as the opening of the tip of the tapered portion 12 in the lumen 10 and is continuous with the lumen 10. The lumen 22 has a common central axis with the lumen 10. The size of the opening of the lumen 22 or the distal end 12 is slightly larger than the guide wire G, and is a size that allows the guide wire G to be slidably held. Specifically, the size of the opening of the lumen 22 or the distal end portion 12 is 0.40 to 0.42 mm. Note that the central axis faces the front-rear direction.

  The soft chip 20 is provided with a cylindrical marker (not shown) that does not transmit radiation (X-rays). This marker is covered with the soft chip 20. This covering is performed by caulking a marker to the soft chip 20.

  The material of the tip 2 is a polyether block amide copolymer (Pebax), and the Shore hardness is 63 durometer (D). The material of the soft tip 20 is Pebax, and the Shore hardness is 59D, which is softer than the tip 2. By using Pebax, the tip 2 and the soft tip 20 can be easily formed. The tip 2 is coated with methyl vinyl ether (VEMA) or the like having lubricity when wet, and here is coated with hydrophilic polyethylene oxide (PEO).

  On the other hand, the opening of the lumen 10 is also located at the rear end of the distal end portion 2. Immediately outside the opening is a rear surface 24 that is an end surface of the wall of the tip portion 2 (an O-shaped portion formed by the end surface 2). The rear surface 24 is inclined with respect to the central axis of the distal end portion 2. The shaft 4 connected to the rearmost end portion of the rear surface 24 extends to the proximal end. That is, the shaft 4 extends from a part of the rear surface 24 of the distal end portion 2 to the proximal end.

  FIG. 3A is a cross-sectional view showing the distal end portion 2 of the insertion assisting tool 1 in an enlarged manner, and FIG. 3B is an enlarged view of the shaft 4 connected to the distal end portion 2 of the insertion assisting tool 1. FIG. 4 is a cross-sectional view taken along the line AA in FIG. The shaft 4 is linear and continues to the side wall of the tip 2. The shaft 4 is configured to be flexible from the proximal end toward the distal end.

  Specifically, the shaft 4 is arranged on the proximal end side, and is a hypo pipe 91 made of stainless steel, which is a pipe having an outer diameter smaller than the inner diameter D1 of the distal end portion 2 on the proximal end side from the tapered portion 12, and the hypo pipe. And a resin-made tube 92 which is connected to 91 and extends toward the distal end side. The material of the tube 92 is polyamide. The outer diameter of the tube 92 is substantially equal to the outer diameter of the hypo pipe 91, and the hypo pipe tip 93, which is the tip of the hypo pipe 91, is inserted into the tube 92 and welded, whereby the hypo pipe 91 and the tube 92 are connected. Connected. Further, the hypo pipe distal end portion 93 is configured to be more flexible than the hypo pipe 91 on the proximal end side relative to the hypo pipe distal end portion 93. Specifically, it is more flexible than the hypo-tube 91 on the proximal end side by forming a spiral cut at the hypo-tube distal end portion 93.

  The shaft 4 is integrated with the distal end portion 2 by welding the distal end edge 94 of the tube 92 to the wall portion of the distal end portion 2. In addition, the insertion assisting tool 1 includes a core member 100 that has one end 101 provided on the distal end portion 2 and the other end 102 provided on the shaft 4 and straddling between the distal end portion 2 and the shaft 4. Specifically, the core member 100 is inserted into the tube 92 of the shaft 4, one end 101 is provided at the distal end portion 2, and the other end 102 is provided at the hypo tube 91. More specifically, one end 101 of the core material 100 is an insertion hole that forms a core material insertion hole 110 that is formed at the distal end portion 2 and extends from the rear end 13 of the tapered portion 12 of the distal end portion 2 to the rear end opening of the distal end portion 2. The formed body 111 is loosely inserted. The insertion hole forming body 111 is specifically a resin-made thin tube, and forms a core material insertion hole 110 in the distal end portion 2 by being welded to the inner wall 21 of the distal end portion 2. The other end 101 of the core member 100 is inserted into the hypo pipe 91 and welded to the inner wall 95 of the hypo pipe 91. The core material 100 uses a stainless steel wire whose diameter decreases from the other end 102 toward the one end 101.

  The shaft 4 is coated with a fluororesin. A marker (not shown) is attached to the rearmost portion of the rear surface 24 (around the rearmost end of the welded portion).

  Next, the catheter 31 used in combination with the insertion assisting tool 1 as one embodiment of the present invention will be described. 1 (b) and 5 (a) are explanatory views of the catheter 31, FIG. 2 (b) is a central sectional view of the catheter 31 combined with the insertion aid 1, and the catheter 31 is a tubular body, It has a lumen 32 that has a size of 5 Fr and opens to the rear. The lumen 32 can be inserted with a guide wire G or other therapeutic device such as a balloon catheter.

  The catheter 31 can pass through a stent having an expanded inner diameter of 2.25 to 3.50 mm. It can also pass through the lumen of a 6Fr guiding catheter.

  The distal end edge of the catheter 31 is a soft tip 34 that is more flexible than the proximal end portion. The material of the soft tip 34 is also Pebax, but the soft tip 34 is more flexible than the distal end portion 2 of the insertion assisting tool 1, and specifically has a Shore hardness of 33D. The distal end edge of the soft tip 34 is slightly reduced in diameter from the proximal end side to have a hollow shape. The distal end opening of the catheter 31, that is, the reduced diameter portion of the soft tip 34 contacts the outer periphery of the proximal end edge of the distal end portion 2 of the insertion assisting tool 1 and includes the proximal end edge of the distal end portion 2. The soft chip 34 is mixed with an X-ray opaque material such as tungsten or bismuth oxide to serve as a marker as X-ray opaque.

  Furthermore, the catheter 31 has a structure in which the Shore hardness increases stepwise from the distal end side while maintaining flexibility in the portions other than the soft tip 34. Specifically, it has three types of structures in which the Shore hardness gradually increases from the tip side. First, the proximal end side of the soft tip 34 is a tube 40 made of Pebax having a Shore hardness of 40D. Next, as shown in FIG. 5 (b), the proximal end side of the tube 40 has a stainless steel spiral body 42, a fluororesin (polytetrafluoroethylene, PTFE) inner tube 44 and a Pebax outer shell. A tube structure 48 sandwiched between the cylinders 46 is formed. Subsequently, the base end side is a tube structure 50 having a Shore hardness of 74D, in which a net is put in a nylon tube. In addition, the tube 40, the tube structure 48, and the tube structures 48 and 50 are joined by welding. Moreover, the base end side of the tube structure 50 is a connection part 52 with various instruments. The length of the catheter 31 excluding the connection portion 52 is approximately 1260 mm.

  In addition, the inner surface of the catheter 31 is subjected to fluororesin processing (for example, polytetrafluoroethylene coating). The outer surface of the catheter 31 is coated with PEO.

  As shown in FIG. 2B and FIG. 6, the insertion assisting tool 1 and the catheter 31 are in a state where the distal end opening (leading edge) of the catheter 31 wraps the proximal end edge of the distal end 2 of the insertion assisting tool 1. In combination, the taper 12 of the insertion aid 1 precedes the catheter 31, the shaft 4 passes through the lumen of the catheter 31, and the proximal end of the shaft 4 exits from the connection 52 of the catheter 31. It becomes the standard state (state at the time of insertion).

  In the standard state, the catheter assembly 61 guides the remaining lumen, which is the remaining space excluding the portion occupied by the shaft 4 from the lumen 32 of the catheter 31 between the rear surface of the distal end portion 2 and the proximal end of the catheter 31. An opening on the rear end side of the distal end portion 2 opens toward the proximal end of the catheter 31 so that the wire G can be inserted and the lumen 10 of the distal end portion 2 can receive the guide wire G inserted into the remaining lumen. . In the standard state of the catheter assembly 61, the remaining lumen and the lumen 10 of the distal end portion 2 communicate coaxially.

  Subsequently, a catheter set as an embodiment of the present invention will be described. This catheter set includes a catheter assembly 61 (insertion aid 1 and catheter 31) and a 6Fr guiding catheter 71 (see FIG. 7).

  Two examples of use of the insertion assisting tool 1, the catheter assembly 61, and the catheter set as described above will be described with reference to FIG. Each example relates to an approach from the aortic arch A to the peripheral stenotic lesion of the coronary artery C through the ascending aorta U.

  First, in the case where the guide wire G can be quickly exchanged (rapid exchange, Rx), the user first inserts the guiding catheter 71 of the catheter set until the distal end reaches the mouth of the coronary artery C. And detained. Next, the user inserts the catheter 31 into the lumen of the guiding catheter 71.

  At this time, since the outer surface of the catheter 31 is coated, the user can insert the catheter 31 so as to slide within the inner surface of the guiding catheter 71.

  Subsequently, when the distal end of the catheter 31 reaches the vicinity of the distal end of the guiding catheter 71, the user stops inserting the catheter 31, passes the guide wire G into the lumen of the catheter 31, and the distal end is the lesioned part of the coronary artery C. Insert until S is reached.

  Then, the user inserts the proximal end edge of the guide wire G into the lumens 10 and 22 of the insertion aid 1, and inserts the insertion aid 1 along the guide wire G into the lumen of the catheter 31. The user inserts the insertion assisting tool 1 on the guide wire G and in the lumen 32 of the catheter 31 by operating the shaft 4.

  At this time, since the coating is applied to the inner surface of the catheter 31, the user can insert the guide wire G and the insertion aid 1 in a sliding manner.

  In addition, a tip 12 having an opening slightly larger than the guide wire G or a soft tip 20 having a lumen 22 slightly larger than the guide wire G is connected to the distal end portion 2 of the insertion assisting tool 1. Therefore, the user can smoothly insert the insertion assisting tool 1 around the guide wire G without the tip portion 2 being biased in the lumen 32 of the catheter 31. In addition, since the outer surface of the insertion aid 1 is coated, the user can insert the insertion aid 1 so as to slide in the lumen 32 of the catheter 31. Further, since the lumen 10 of the insertion aid 1 is also coated, the user can insert the insertion aid 1 while sliding on the guide wire G.

  Furthermore, since the insertion assisting tool 1 has the shaft 4 connected to a part of the rear surface 24 in the opening on the proximal end side of the distal end portion 2, the portion that contacts the inner surface of the catheter 31 as the insertion assisting tool 1 is almost at the distal end. The insertion assisting tool 1 can be easily inserted into the lumen 32 of the catheter 31 and can be guided within the insertion assisting tool 1. The passage portion of the wire G can be only the lumens 10 and 22 related to the distal end portion 2 and the guide wire G can be taken in and out from the opening behind the distal end portion 2. Even if the insertion aid 1 is used, the guide wire G can be exchanged quickly.

  Thus, when the tapered portion 12 of the insertion assisting tool 1 is exposed from the distal end opening ahead of the catheter 31, and the insertion assisting tool 1 and the catheter 31 are in the standard state of the catheter assembly 61, the user can set the catheter assembly. The solid 61 is inserted along the guide wire G until the tip reaches the front of the lesioned part S.

  At this time, since the distal end portion 2 of the insertion assisting tool 1 is tapered, the step between the catheter 31 and the guide wire G can be reduced, and the distal end of the catheter 31 can be introduced safely and easily. it can. Further, since the soft tip 20 that is more flexible than the distal end portion 2 is joined to the distal end of the insertion assisting tool 1, even when the catheter assembly 61 precedes the guiding catheter 71, it is difficult to damage the blood vessel. In addition, since the soft tip 34 that is more flexible than the proximal end side is present at the distal end opening of the catheter 31, the blood vessel is similarly hardly damaged.

  In addition, since the marker is provided on the soft tip 20 of the insertion aid 1, the operator can grasp the leading edge of the insertion aid 1 and can easily operate the insertion aid 1 and the catheter assembly 61. Further, since the marker 14 is provided immediately after the tapered portion 12 in the distal end portion 2, it is easy to grasp that the catheter assembly 61 is in the standard state by placing the distal end edge of the catheter 31 on the marker 14. Since the tip of the catheter 31 protrudes from the tapered portion 12 ahead of the marker 14, it is possible to prevent a situation in which a blood vessel is damaged due to a step. Furthermore, since the marker is attached to the shaft 4 connecting portion on the rear surface 24 of the distal end portion 2, when the guide wire G is exchanged, the step slightly rises from the inner surface of the catheter 31 by the thickness of the distal end portion 2 of the insertion assisting tool 1. If there is a slight step between the distal end portion 2 and the shaft 4, this step can be noted, and the guide wire G can be easily exchanged.

  Then, as shown in FIG. 5, when the distal end of the catheter assembly 61 reaches the front of the lesioned part S, the user operates the catheter assembly 61 and uses the tapered part 12 of the insertion assisting tool 1 to cause the lesioned part S. To open the catheter 31 until the distal end of the catheter 31 reaches the vicinity of the center of the lesion S.

  At this time, the distal end portion 2 of the insertion assisting tool 1 has a tapered portion 12 and the distal end portion 2 is tapered. Therefore, the lesioned portion S can be gradually pushed open, and the lesioned portion S of the catheter 31 is moved to. Can be secured without difficulty. Moreover, even if the lesioned part S is hardened by calcification or the like, the progression of the catheter 31 to the lesioned part S can be ensured. Furthermore, even if there is a cured portion or a stent placement portion in front of the lesioned part S, the tapered portion 12 can be inserted first, and can be pushed open if necessary. Easy to guide. In addition, when the catheter 31 approaches the distal portion by the insertion assisting tool 1, the catheter 31 can further back up the guide wire G, and the guide wire G can be further advanced to the periphery.

  Further, since the catheter 31 is advanced by the insertion assisting tool 1 having the tapered distal end portion 2, the distal end of the catheter 31 can be placed deep in the coronary artery C (Deep Engage), and the catheter 31 is inserted deeply into the coronary artery C. The catheter 31 or the guiding catheter 71 can be firmly fixed by utilizing the friction force generated between the catheter 31 and the intima of the coronary artery C. Further, with such an insertion assisting tool 1, the distal end of the catheter 31 can be advanced to the immediate vicinity of the lesioned part S, the distal contrast can be selectively performed, and a small amount of contrast medium is sufficient. Moreover, since the insertion assisting tool 1 has a tapered tip 2 and has a soft tip 20 that is more flexible than the tip 2, dissociation of the intima can be prevented even during deep engagement. .

  The soft tip 20 is harder than the soft tip 34 of the catheter 31 and is considered to ensure passage through the lesioned part S. Conversely, software that does not need to consider passing through the lesioned part S. The tip 34 is made more flexible than any part of the catheter assembly 61, and prevents a step caused by a slight opening with respect to the insertion assisting tool 1 from being damaged.

  As described above, when the insertion of the distal end of the catheter 31 into the lesioned part S is ensured, the user operates the shaft 4 to pull out the insertion assisting tool 1 from the catheter 31. The insertion aid 1 can be pulled out as easily as the insertion.

  Then, the user inserts a balloon catheter (not shown) into the catheter 31 and diagnoses or treats the lesioned part S. If only the guiding catheter 71 is used and the catheter 31 is not used, the guiding catheter 71 may be detached from the coronary artery C when the balloon catheter or the like is inserted into the coronary artery C. Therefore, as described above, the catheter 31 having an appropriate size is also introduced into the coronary artery C so that a backup force can be applied to the balloon catheter or the like from the catheter 31 and the detachment of the guiding catheter 71 is prevented. . In such a treatment using a double guiding catheter, the outer tube is 6 Fr and the inner tube is 5 Fr, particularly called “5 in 6 Technique”. The present invention is a treatment using a double guiding catheter such as “5 in 6 Technique”, and it is also an object of the present invention to improve the advancement performance of the inner tube and ensure the exchange function of the guide wire G. I will. In addition, the tip pressure of the catheter 31 can be measured by pulling back.

  The user pulls out the balloon catheter, catheter 31, guide wire G, and guiding catheter 71 as appropriate after diagnosis or treatment of the lesion S. When the insertion assisting tool 1 is used, the procedure from insertion of the catheter 31 to treatment can be normally performed only by inserting one guide wire G once.

  Second, the operation on the guide wire G (over-the-wire) is the same as in the case of Rx up to the placement of the guiding catheter 71. After this placement, the user inserts the catheter assembly 61 in the standard state on the guide wire G in the guiding catheter 71 and brings it to the lesion S as it is. After the catheter 31 reaches the vicinity of the center of the lesioned part S and the insertion assisting tool 1 is extracted from the catheter 31, it is the same as in the case of Rx. If the guide wire G advances when the catheter assembly 61 is inserted, the user holds the guide wire G down.

  Even in the case of this over-the-wire, the passage through the catheter 31 to the center of the lesioned part S is improved, and the guide wire G can be quickly replaced even if the insertion assisting tool 1 is used. It is the same as in the case of Rx in that the device 1 can be smoothly inserted and removed from the catheter 31.

  In the standard state, the catheter assembly 61 has a guide wire G in a remaining lumen that is a space excluding a portion occupied by the shaft 4 from the lumen 32 of the catheter 31 between the rear surface of the distal end portion 2 and the proximal end of the catheter 31. The rear end side opening of the distal end portion 2 opens toward the proximal end of the catheter 31 so that the lumen 10 of the distal end portion 2 can receive the guide wire G inserted into the remaining lumen. Accordingly, when the guide wire G is exchanged in the standard state, the guide wire G can be prevented from being caught by the catheter 31, and the guide wire G can be easily exchanged.

  In the catheter assembly 61, the remaining lumen and the lumen 10 of the distal end portion 2 communicate coaxially in a standard state. Accordingly, when the guide wire G is inserted into the catheter assembly 61 in the standard state, the guide wire G can be prevented from being bent by the remaining lumen and the lumen 10 of the distal end portion 2, and thus the guide wire G can be smoothly removed. The guide wire G can be easily exchanged.

  Furthermore, the shaft 4 is configured to be flexible from the proximal end toward the distal end side. As a result, stress concentration caused by the difference in flexibility between the shaft 4 and the distal end portion 2 can be reduced, and the insertion assisting tool can be prevented from being broken. In addition, the insertion assisting tool 1 has one end provided at the tip 2 and the other end provided at the shaft 4 and has a core material straddling between the tip 2 and the shaft 4. The possibility that the tool will be kinked can be further reduced.

  In addition, other embodiment of this invention which mainly changes the said embodiment and illustrates is illustrated. The shore hardness of the catheter 31 is set to 70D in the tube structure 50 of FIG. 5 (a), or as shown in FIG. 5 (c), the tube 31 includes four tubes 80 or 81 to 83, and a soft tip. The shore hardness is 40D, 40D, 63D, 74D in order from the side.

  A side hole is provided at the distal end portion of the proximal end side of the distal end edge of the catheter 31. For example, it is provided in a distal end portion other than the distal end edge including the distal end portion 2 of the insertion assisting tool 1 in a standard state, or provided at a position 30 to 150 mm away from the distal end of the catheter 31. By providing side holes, blood perfusion can be obtained.

  The entire catheter may be a tube, or only a tube structure containing a helix or mesh. The insertion aid, catheter, guiding catheter material, hardness, presence / absence of soft tip, presence / absence of marker, size, length, usage, etc. are other than the above. Only the catheter assembly is used, not the guiding catheter, such as by placing the catheter, passing a guide wire through it, placing an insertion aid into the catheter and leading the catheter.

  The shaft of the insertion assisting tool is extended from the most distal portion of the rear surface inclined with respect to the central axis at the distal end portion, or is extended from the half circumference portion or the quarter circumference portion on the rear surface orthogonal to the central axis. The shaft is molded or cut out integrally with the tip portion. The cross-sectional shape of the shaft is made to be the same as the cross-sectional shape of a part of the rear surface. Do not reduce the diameter of the catheter tip.

  For the procedure in Rx, after placing the guiding catheter, insert the guide wire to the vicinity of the lesion, then introduce the catheter along the guide wire until the distal end reaches the distal end of the guiding catheter, and further insert the insertion aid. Introduce along the guide wire within the lumen of the catheter, and when the standard state of the catheter assembly is formed, the order is changed as appropriate, such as introduction of the catheter assembly to the lesion, or a part of the content is changed. Omit parts and add another operation. For other procedures, the order is changed, or the contents are partially changed, some are omitted, and another operation is added.

In addition, an insertion assisting tool, a catheter assembly, or a catheter set similar to those in the above-described embodiment can be used as “5 in 6”.
Used in procedures other than “Technique”, or used for biological ducts other than the coronary arteries including the carotid artery. The same insertion assisting tool as in the above embodiment shall be preceded by a delivery catheter through which a diagnostic device such as an ultrasonic diagnostic catheter is inserted, or preceded by a suction catheter for sucking a thrombus or the like. Or

1 Insertion aid 2 Tip 4 Shaft 12 Tip 20 Soft tip 31 Catheter 61 Catheter assembly 71 Guiding catheter

Claims (6)

An insertion aid that assists the insertion of the catheter by passing through the catheter and preceding the catheter,
A tapered tip having a guidewire lumen that opens later;
A continuous shaft at the tip,
Combined with the catheter in a state where the distal end opening of the catheter wraps the proximal end edge of the distal end of the insertion assisting tool, the distal end of the insertion assisting tool precedes the catheter, the shaft passes through the lumen of the catheter, The portion occupied by the shaft of the insertion assisting tool from the lumen of the catheter between the distal end portion of the insertion assisting tool and the proximal end of the catheter in a state where the proximal end edge of the shaft protrudes from the proximal end opening of the catheter The insertion assisting tool is capable of inserting a guide wire into a remaining lumen which is a remaining space excluding the guide, and the guide wire lumen at the tip of the insertion assisting tool can receive the guide wire inserted into the remaining lumen. An insertion assisting device characterized in that an opening on the rear end side of the distal end portion of the catheter opens toward the proximal end of the catheter.   The insertion assisting tool according to claim 1, wherein a soft tip having a guide wire lumen and being more flexible than the distal end is provided at the distal end of the distal end. The insertion assisting tool according to claim 1 or 2,
A catheter assembly comprising a catheter having a distal end opening that can include a proximal end edge of the distal end of the insertion assisting tool. The catheter assembly according to claim 3, wherein the distal end portion of the insertion assisting tool is harder than the distal end opening portion of the catheter. The insertion assisting device according to claim 3 or 4, wherein a side hole is provided at a distal end portion proximal to the distal end edge of the catheter. A catheter assembly according to any one of claims 3 to 5;
A catheter set comprising a guiding catheter for receiving the catheter assembly.

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