JP2008086476A - Suction catheter and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suction catheter having excellent suction performance and insertion ease, and also to provide a method for producing the same. <P>SOLUTION: The suction catheter 10 has openings 14 and 15 on the distal and proximal ends respectively, suction lumens 12a and 12b for sucking thrombus or the like, openings 26 and 27 on the distal and proximal ends respectively, and a guidewire lumen 18 extending in almost parallel with respect to the suction lumens for inserting a guidewire. The suction lumens 12a and 12b have a flat part 20 with an oval cross section perpendicular to the catheter in the longitudinal direction at least at a part of the catheter between the distal and proximal ends. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a suction catheter used for sucking and removing a thrombus or the like in a blood vessel. More specifically, the present invention has a rapid exchange type structure in which catheter replacement is easy, and is a suction catheter excellent in suction performance and insertability. And a manufacturing method thereof.

  For myocardial infarction in which the coronary artery is occluded by a thrombus and the blood flow in the coronary artery is obstructed, a treatment method in which the occlusion site is expanded by a balloon catheter is mainly used. However, when the occlusion site is expanded by the balloon catheter, the thrombus may be detached from the occlusion site and flow out, and the peripheral blood vessel may be clogged. Therefore, when a balloon catheter is used in a case where the coronary artery is occluded by a large amount of thrombus, severe peripheral embolism may be induced.

  In recent years, it has become clear that a treatment method (coronary thrombus aspiration therapy) that sucks and removes a thrombus using an aspiration catheter as described in Patent Document 1 is effective for such cases. It has become to.

  In the suction catheter described in Patent Document 1, in order to insert along a guide wire inserted into a blood vessel, a guide having a guide wire lumen 105 for inserting the guide wire as shown in FIGS. 6 and 7 A structure (rapid exchange structure) having a wire shaft 103 and a main shaft 101 having a suction lumen 102 for sucking a thrombus or the like is employed.

In this suction catheter, the guide wire shaft 103 is disposed outside the most distal end portion of the main shaft 101. As shown in FIGS. 6 and 7, the main shaft 101 can easily secure a suction lumen. It has a perfect circular cross-sectional shape.
JP 2004-65326 A

  However, the structure such as the suction catheter of Patent Document 1 has a problem that the cross-sectional area of the suction lumen of the main shaft is reduced because the guide wire shaft and the main shaft, each having a perfect cross-sectional shape, overlap each other. . In other words, the inner diameter of the blood vessel, or the inner diameter of the guiding catheter that guides the suction catheter to a desired position in the blood vessel, the inner diameter of the guide wire shaft, and the wall thickness of the tube are respectively determined. Therefore, when the suction catheter formed by superimposing the guide wire shaft and the main shaft having a perfect cross-sectional shape is accommodated in the blood vessel or the guiding catheter, the inner diameter of the main shaft is reduced. As a result, there is a problem that the suction force of this type of suction catheter is insufficient.

  On the other hand, if the inner diameter is increased while maintaining the cross-sectional shape of the main shaft in order to increase the suction force, the length of the suction catheter in FIG. 7 (a) increases, exceeding the limit dimension. As a result, the guide wire shaft cannot be inserted.

  Further, in this way, the suction catheter in which two tubes having a perfect cross-sectional shape are overlapped has a long cross-sectional shape in the direction in which the tubes overlap (hereinafter referred to as “height direction”). There is also a problem that the insertion property is poor, such as being easily caught inside a blood vessel or a guiding catheter, and the flexibility in the height direction in FIG.

  Then, this invention makes it a subject to provide the suction catheter excellent in suction performance and insertion property, and its manufacturing method.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

  The invention according to claim 1 has openings (14, 15) at the distal end and the proximal end, respectively, a suction lumen (12a, 12b) for sucking a thrombus and the like, and a distal end and a proximal end A suction catheter (10) having an opening (26, 27) at each end, extending substantially parallel to the suction lumen, and formed with a guide wire lumen (18) for inserting a guide wire or the like, The suction lumen has the flat portion (20) in which the cross-sectional shape of the surface orthogonal to the longitudinal direction has an elliptical shape at least in part from the distal end to the proximal end of the catheter. It is something to try.

  The “distal end” refers to the suction catheter of the present invention, and the suction and guide wire lumens constituting the suction catheter on the side opposite to the operation side (hereinafter referred to as “proximal end”). Refers to the tip. The proximal end of the suction lumen refers to the end on the operation side, while the proximal end of the guide wire lumen refers to that when the guide wire lumen extends from the distal end by, for example, about 10 mm to 300 mm. The end on the operation side refers to the end on the hand side when extending to the hand.

  When viewed in a cross-section orthogonal to the longitudinal direction of the suction catheter, the guide wire lumen is provided adjacent to the catheter tube on the elliptical short-axis extension line of the suction lumen.

  The elliptical shape of the flat part is not necessarily a true ellipse, and may be a slightly deformed substantially elliptical shape.

  The invention according to claim 2 is characterized in that, in the suction catheter (10) according to claim 1, the flatness ratio of the flat portion (20) is 49% to 95%.

  The flatness ratio when the cross-sectional shape of the flat portion is an ellipse can be obtained by dividing the minor axis of the ellipse by the major axis. In addition, when the cross-sectional shape of the flat portion is a substantially elliptical shape that is not a true ellipse, a rectangle circumscribing the substantially elliptical shape having a long side parallel to a portion having a major axis in the substantially elliptical shape is obtained. The rectangle can be obtained by dividing the short side of the rectangle by the long side of the rectangle.

  The invention according to claim 3 is the suction catheter (10) according to claim 1 or 2, wherein the flat portion (20) is in the range of 10 mm to 300 mm from the distal end toward the proximal end. It is characterized by.

  The invention according to claim 4 is the suction catheter (10) according to claim 1 or 2, wherein the flat portion (20) is the entire range from the distal end to the proximal end.

  The invention according to claim 5 is the suction catheter (10) according to any one of claims 1 to 4, wherein the catheter tube (13) having suction lumens (12a, 12b) formed therein and a guide therein. The above-mentioned problem is to be solved by a suction catheter that includes a guide wire insertion tube (19) in which a wire lumen (18) is formed, and in which the catheter tube and the guide wire insertion tube are joined.

  According to a sixth aspect of the present invention, at least a portion including a distal end of a tube having an opening at each of a distal end and a proximal end and having a circular shape in cross section and having a lumen formed therein. The step (S4) of forming a catheter tube in which a flat portion having an elliptical cross section is formed, and a guide wire insertion tube having openings at the distal end and the proximal end respectively. The above-mentioned problem is to be solved by a suction catheter manufacturing method comprising the step (S5) of bonding to a flat portion.

  According to the first aspect of the present invention, an aspiration catheter having a larger lumen cross-sectional area than that of the conventional product can be produced by making the cross-sectional shape of the aspiration lumen an elliptical shape. Thereby, the suction performance of the suction catheter (that is, the suction weight of a thrombus or the like per unit time under a predetermined pressure) can be improved. Moreover, since the cross-sectional shape of the suction catheter spreads in the lateral direction, it is possible to provide a suction catheter excellent in insertability into a blood vessel or a guiding catheter.

  According to the second aspect of the present invention, it is possible to provide a suction catheter in which a flat portion in which the flatness is set so that the suction performance is optimized is a cross-sectional shape of the suction lumen.

  According to the third aspect of the present invention, the flat part is provided only for a predetermined length from the distal end toward the proximal end side, so that molding is easy and the suction performance and the insertability are excellent. A suction catheter can be provided.

  According to the fourth aspect of the present invention, by having the guide wire lumen over the entire range from the distal end to the proximal end, it is possible to provide a suction catheter excellent in suction performance and insertability.

  According to the fifth aspect of the present invention, it is possible to provide a suction catheter that is easy to manufacture while improving the suction performance.

  According to the sixth aspect of the present invention, it is possible to provide a method for easily manufacturing a suction catheter having a high suction efficiency of the suction catheter and excellent in insertion into a blood vessel or a guiding catheter.

  Such an operation and gain of the present invention will be made clear from the best mode for carrying out the invention described below.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

[First embodiment]
(Aspiration catheter)
FIG. 1 is a plan view showing an aspiration catheter according to the first embodiment of the present invention. 2A is a cross-sectional view taken along the line AA ′ of the suction catheter shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB ′ of the suction catheter shown in FIG. Hereinafter, the suction catheter according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2 (a) and 2 (b). In addition, the broken line in FIG. 1 represents the location where the catheter tube 13 and the guide wire insertion tube 19 are joined.

  The suction catheter 10 according to the first embodiment of the present invention includes a catheter tube 13 having openings 14 and 15 at the distal end and proximal end and suction lumens 12a and 12b therein, and a distal end and a proximal end. A guide wire insertion tube 19 having a guide wire lumen 18 extending substantially parallel to the suction lumen is provided in the inside with openings 26 and 27 at the distal end. The suction lumens 12a and 12b have a flat portion 20 whose cross-sectional shape perpendicular to the longitudinal direction is an elliptical shape at least at a part from the distal end opening 14 to the proximal end side of the suction catheter 10.

  Here, the distal end means the suction catheter 10, and the operation side end (proximal end, right side in FIG. 1) of the catheter tube 13 and the guide wire insertion tube 19 constituting the suction catheter. This means the tip on the opposite side (left side in FIG. 1). Specifically, according to the example of FIG. 1, the distal end of the catheter tube 13 indicates the vicinity of the opening 14, and the distal end of the guide wire insertion tube 19 indicates the vicinity of the opening 26. On the other hand, the proximal end of the catheter tube 13 refers to the vicinity of the opening 15 at the end on the operation side, and the proximal end of the guide wire insertion tube 19 refers to a range of, for example, about 10 mm to 300 mm from the distal end of the tube. Is provided in the vicinity of the opening 27 at the end on the hand side.

  As shown in FIG. 1, the suction catheter 10 is formed by joining the outer surface of the catheter tube 13 and the outer surface of the guide wire insertion tube 19 that exist independently. Specifically, on the distal end side of the suction catheter 10, as shown in FIG. 2 (a), there is a flat portion 20 of the catheter tube 13 below the drawing in the height direction of the suction catheter 10, and above it. There is a guide wire insertion tube 19. At this time, the catheter tube 13 is disposed such that the long axis of the elliptical shape that is the cross-sectional shape of the flat portion 20 is orthogonal to the height direction of the suction catheter 10. The position where the guide wire insertion tube 19 is joined may coincide with the distal end of the catheter tube 13, but from the viewpoint of insertability, the tip of the guide wire insertion tube 19 is more than the distal end of the catheter tube 13. It is preferable that the position is slightly protruding. In the other portion, that is, the proximal end side portion of the suction catheter 10 (the range indicated by the line segment 13b in FIG. 1), as shown in FIG. 2B, the catheter tube 13 exists alone. .

  (Catheter tube)

  In the suction catheter 10 according to the first embodiment of the present invention, the catheter tube 13 has two portions, a flat portion 20 whose cross-sectional shape is an elliptical shape, and a perfect circle portion 22 whose cross-sectional shape is a perfect circle. Do it. The flat portion 20 refers to a portion of the catheter tube 13 that is near the distal end and to which the guide wire insertion tube 19 is joined at least on the catheter tube 13 (range indicated by a line segment 13a in FIG. 1). The perfect circle portion 22 is a portion of the catheter tube 13 where the guide wire insertion tube 19 is not joined on the tube, that is, a portion closer to the proximal end than the portion where the guide wire insertion tube 19 is joined (see FIG. 1 indicates a range indicated by a line segment 13b).

  The flat portion 20 of the catheter tube 13 has an elliptical cross-sectional shape. Such a catheter tube can be produced, for example, by crushing a tube having a larger inner diameter than a conventional catheter tube having a perfect cross-sectional shape so that the cross-sectional shape of the flat portion becomes an elliptical shape. The cross-sectional shape is not necessarily a true ellipse, but may be a slightly deformed substantially elliptical shape. Thus, by providing a flat portion on a slightly larger tube than the conventional tube to form the catheter tube 13, it can be stored in the inner diameter of the blood vessel or the guiding catheter used by being inserted into the blood vessel. Compared to the suction performance of thrombus and the like.

  The flatness ratio of the flat portion 20 is preferably 49% to 95%. The flatness ratio of the flat portion can be obtained by dividing the elliptical minor axis by the major axis. Hereinafter, the major axis direction of the elliptical shape is sometimes referred to as “lateral direction”, and the minor axis direction of the elliptical shape is sometimes referred to as “vertical direction”. When the flattening ratio of the flat portion 20 is 49% or less, the cross-sectional area of the catheter tube 13 is reduced by 17% or more, so that the suction performance of the suction catheter 10 is impaired, and a perfect circle that is a cross-sectional shape of a blood vessel or a guiding catheter is used. This is not preferable because it protrudes significantly outward in the lateral direction and may adversely affect insertability. On the other hand, since the shape of the flat portion 20 approaches a perfect circle when the flatness ratio is 95% or more, the length in the height direction of the suction catheter 10 (hereinafter referred to as “height” of the suction catheter) increases, and the guy There is a possibility that the insertion property in the ding catheter is significantly lowered. Therefore, as described above, the flatness ratio of the flat portion 20 is preferably 49% to 95%.

  The length of the flat portion 20 in the catheter tube 13 is preferably 10 mm to 300 mm from the distal end side opening toward the proximal end side.

  When forming an elliptical catheter tube by crushing a circular tube having a circular cross section in the radial direction as a tube used for the catheter tube 13, the inner diameter of the tube before the cross-sectional shape is changed to an elliptical shape is, for example, 6 French. In the case of a suction catheter having a size of 1.10 mm, it is preferable to use a 1.35 mm suction catheter having a size of 7 French.

  In the catheter tube 13, the boundary between the flat portion 20 and the perfect circle portion 22 is preferably formed in a tapered shape from the viewpoint of insertability.

  From the viewpoint of insertability of the suction catheter 10, the opening 14 at the distal end of the catheter tube 13 is formed by cutting the tube obliquely with respect to the longitudinal direction with the upper side in the height direction (upper flat portion 20) as the distal end. The Since the cross-sectional shape of the catheter tube 13a is elliptical in the opening 14, the cross-sectional area of the opening 14 oblique to the longitudinal direction is wider than the cross-sectional shape of the surface orthogonal to the longitudinal direction, and a larger thrombus. Etc. can be sucked.

  The material of the catheter tube 13 is preferably a resin tube or a blade tube. The blade tube refers to, for example, a resin tube having a stainless steel mesh. Specifically, it is preferable that the resin pipe is an inner layer, a stainless steel mesh is coated on the outer side, and a flexible resin material is coated on the outer side as a surface material of the pipe. And as the performance of the material of the catheter tube 13, it is preferable that the catheter tube 13 is flexible enough to be inserted into the body, hardly damaged, and excellent in kink resistance that prevents the tube from being bent.

  Furthermore, a strain relief 35 and a connector 36 for connecting to other medical devices may be attached to the proximal end of the catheter tube 13.

(Guide wire insertion tube)
The guide wire insertion tube 19 has openings 26 and 27 at a distal end and a proximal end, and a guide wire lumen 18 therein. As shown in FIGS. 2A and 2B, the guide wire insertion tube 19 is a tube having a perfect cross section. The inner diameter of the guide wire insertion tube 19 is not particularly limited as long as it has a guide wire lumen 18 that allows the guide wire to be easily inserted. However, in order to increase the inner diameter of the catheter tube, it is preferable that the inner diameter of the guide wire insertion tube 19 is as small as possible. Moreover, since the guide wire insertion tube 19 is arrange | positioned on the flat part 20 (catheter tube 13a) in 1st Embodiment of this invention, it is preferable that the length of the guide wire insertion tube 19 is 10 mm-300 mm. Furthermore, the guide wire insertion tube 19 is preferably a resin tube having excellent flexibility.

  Further, a contrast marker 31 for confirming the position of the suction catheter in the body under X-ray fluoroscopy may be mounted in the vicinity of the opening 26 of the guide wire insertion tube 19.

[Second Embodiment]
(Aspiration catheter)
FIG. 3 is a plan view showing an aspiration catheter according to the second embodiment of the present invention. Hereinafter, the suction catheter 50 according to the second embodiment of the present invention will be described with reference to FIG. The suction catheter 50 has openings 54 and 55 at the distal end and the proximal end, and a catheter tube 53 having a suction lumen (not shown) therein, and openings 66 and 67 at the distal and proximal ends. A suction catheter 10 according to the first embodiment of the present invention in that it has a guide wire insertion tube 59 having a guide wire lumen (not shown) extending substantially parallel to the suction lumen. It is common. However, in the entire range from the distal end to the proximal end of the catheter tube 53, the cross section of the surface orthogonal to the longitudinal direction of the suction lumen (not shown) has an elliptical flat portion 60. Different from the suction catheter 10 according to the first embodiment.

  The suction catheter 50 is different from the catheter tube 53 in that the cross-sectional shape of the surface perpendicular to the longitudinal direction of the suction lumen (not shown) is an elliptical shape, except that the suction catheter 50 according to the first embodiment of the present invention is different. Therefore, the description of the catheter tube 53 and the guide wire insertion tube 59 is omitted.

[Third Embodiment]
(Aspiration catheter)
FIG. 4 is a plan view showing an aspiration catheter according to the third embodiment of the present invention. Hereinafter, a suction catheter 80 according to a third embodiment of the present invention will be described with reference to FIG. The suction catheter 80 has openings 84 and 85 at the distal and proximal ends, and a catheter tube 83 having a suction lumen (not shown) therein, and openings 96 and 97 at the distal and proximal ends. A guide wire insertion tube 89 having a guide wire lumen (not shown) extending substantially parallel to the suction lumen, and having a proximal end opening from the distal end side opening 84 of the catheter tube 83. In the range up to 85, the second embodiment of the present invention is the same as the second embodiment of the present invention in that it has an elliptical flat section 90 with respect to a surface orthogonal to the longitudinal direction of a suction lumen (not shown). However, it differs from the second embodiment of the present invention in that the guide wire insertion tube 89 is provided in the entire range from the distal end to the proximal end of the catheter tube 83.

  Since the suction catheter 80 is the same as the suction catheter 50 according to the second embodiment of the present invention except that the length of the guide wire insertion tube 89 is different, the description of the catheter tube 83 and the guide wire insertion tube 89 will be omitted. Omitted.

[Production method]
FIG. 5 is a diagram showing the order of steps in the method for manufacturing a suction catheter according to the present invention. Hereinafter, the manufacturing method of the suction catheter of the present invention will be described in the order of FIG. In the manufacture of the suction catheter of the present invention, first, step S1 of attaching a contrast marker near the distal end opening of the guide wire insertion tube is performed. Next, step S2 is performed in which the distal end opening of the guide wire insertion tube equipped with the contrast marker is heated and rounded. Thereafter, step S3 is performed in which one end side of the catheter tube having a perfect circular cross section is cut obliquely. These steps S1 to S3 are the same as the manufacturing steps of a normal suction catheter.

  Next, by pressing at least a part including a distal end of a tube having an opening at each of a distal end and a proximal end and having a circular shape in cross section and having a lumen formed therein, Step S4 of forming a catheter tube in which a flat portion having an elliptical cross section is formed is performed. For example, in the case of the first embodiment of the present invention, the at least part including the distal end refers to a range indicated by the catheter tube 13a with respect to the longitudinal direction in FIG. 1, and the second embodiment of the present invention. 3 refers to the entire range from the distal end to the proximal end of the catheter tube 53 with respect to the longitudinal direction in FIG. Then, pressure is applied to this range to form a catheter tube having an elliptical cross section from a tube having a perfect cross section. The pressure is applied downward by placing the tube so that the sharply cut tip of the tube is on the upper side of the ellipse in the minor axis direction (upper flat portion). The molding method is preferably pressure molding by press working, but is not limited thereto.

  Further, step S5 is performed in which guide wire insertion tubes each having an opening at the distal end and the proximal end are joined to the flat portion of the catheter tube. When the guide wire insertion tube is disposed at the distal end of the catheter tube, it is preferable from the viewpoint of the insertion property of the suction catheter that the distal end of the guide wire insertion tube slightly protrudes from the distal end of the catheter tube. For example, when the guide wire insertion tube extends over the entire range from the distal end to the proximal end of the catheter tube as in the third embodiment of the present invention, the guide wire insertion tube is used as the catheter tube. Not only the distal end of the catheter, but also the entire length of the catheter tube and joined by applying heat.

  In addition, as a subsequent step of the characteristic steps S4 and S5 of the present invention, a connector and a strain relief are inserted into the proximal end of the catheter tube so that the suction catheter can be connected to other medical devices, and an adhesive is used. Step S6 is performed for bonding using the like. Although not shown in FIG. 5, after the step S6, in order to make the guide wire insertion tube and the catheter tube more closely contact with each other and improve the insertability, a resin film is coated around these tubes. A step of heating may be provided.

  Hereinafter, the present invention will be specifically described by way of examples.

1. Preparation of test piece (Example 1)
The inner diameter of the tube having a perfect circle for the catheter tube is 1.10 mm, the height of the suction catheter is 1.70 mm, and the minor axis of the ellipse which is the sectional shape of the catheter tube is 1.00 mm (the flatness is 82%) Thus, a suction catheter according to the first embodiment of the present invention was produced. The length of the portion where the cross-sectional shape of the catheter tube of this suction catheter is an ellipse was 6 mm.

(Example 2)
A suction catheter was prepared in the same manner as in Example 1 except that the length of the portion of the suction catheter having an elliptical cross-sectional shape was 60 mm.

(Comparative Example 1)
6 so that the inner diameter of the tube having a perfect circular cross section for the catheter tube is 1.10 mm, the height of the suction catheter is 1.80 mm, and the inner diameter of the catheter tube is 1.10 mm (the cross sectional shape is a perfect circle). In addition, a conventional type suction catheter shown in FIGS. 7A and 7B was produced. The same material as in Example 1 was used for the guide wire insertion tube and the catheter tube.

2. Evaluation Method Using the suction catheters of Examples 1 and 2 and Comparative Example 1 above, the suction performance of the suction catheter varies depending on whether the cross-sectional shape of the catheter tube of the suction catheter is an ellipse or a perfect circle. It was measured. Specifically, using these suction catheters, the weight of the sucked object that was sucked when the sucked object (tomato juice) at 24.5 ° C. was sucked for 30 seconds with a 30 mL suction syringe was measured. With the above test method, each suction catheter was tested three times, and the average value of the weights of the measured suction objects was calculated.

  The measurement results in Examples 1 and 2 and Comparative Example 1 are shown in Table 1.

2. Evaluation Results In Example 1 in which the flatness of the catheter tube was 82% and the length of the elliptical cross-section of the catheter tube was 6 mm, the average weight of the suction object was 24.18 g. Similarly, in Example 2 in which the flatness of the catheter tube was 82% and the length of the elliptical section of the catheter tube was 60 mm, the average weight of the suction object was 24.14 g. From this, it was found that the weight of the suction object decreases slightly as the length of the elliptical section of the catheter tube increases.
However, in Comparative Example 1 in which the flatness of the catheter tube was 0% and the length of the oval portion was 0 mm, the average weight of the suction object was 24.29 g, which was not significantly different from Examples 1 and 2. . Therefore, it was found that the suction performance of the suction catheter having a catheter tube flatness of about 82% is almost the same as the suction performance of a suction catheter having a flatness of 0%. In Examples 1 and 2, since the suction catheter tube was produced using a tube having a larger inner diameter than the catheter tube of the conventional suction catheter, the suction performance is improved even if the cross-sectional shape of the catheter tube is elliptical. I understood that.

  While the present invention has been described in connection with embodiments that are presently the most practical and preferred, the present invention is not limited to the embodiments disclosed herein. However, the present invention can be modified as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and a suction catheter and a method for manufacturing the same with such changes are also included in the technical scope of the present invention. Must be understood as being.

It is a top view which shows the suction catheter which concerns on 1st Embodiment of this invention. (A) is A-A 'sectional drawing of the suction catheter of FIG. 1, (b) is B-B' sectional drawing of the suction catheter of FIG. It is a top view which shows the suction catheter which concerns on 2nd Embodiment of this invention. It is a top view which shows the suction catheter which concerns on 3rd Embodiment of this invention. It is the figure showing the manufacturing process order of the suction catheter of this invention. It is a top view which shows the conventional suction catheter. (A) is C-C 'sectional drawing of the suction catheter of FIG. 6, (b) is D-D' sectional drawing of the suction catheter of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Aspiration catheter 12a, 12b Aspiration lumen 13, 13a, 13b Catheter tube 14 Opening 15 Opening 18 Guide wire lumen 19 Guide wire insertion tube 20 Flat part 22 Round part 26 Opening 27 Opening

Claims (6)

A suction lumen for sucking a thrombus, etc., each having an opening at the distal end and the proximal end, each having an opening at the distal end and the proximal end, extending substantially parallel to the suction lumen, and a guide A suction catheter formed with a guide wire lumen for inserting a wire or the like,
The suction lumen is a suction catheter having a flat portion whose cross-sectional shape perpendicular to the longitudinal direction is elliptical in at least a part from the distal end to the proximal end of the catheter.   The suction catheter according to claim 1, wherein a flatness ratio of the flat portion is 49% to 95%.   The suction catheter according to claim 1 or 2, wherein the flat portion is in a range of 10 mm to 300 mm from the distal end toward the proximal end side.   The suction catheter according to claim 1, wherein the flat portion is a whole range from the distal end to the proximal end. A catheter tube having the suction lumen formed therein;
A guide wire insertion tube having the guide wire lumen formed therein,
The suction catheter according to any one of claims 1 to 4, wherein the catheter tube and the guide wire insertion tube are joined. By pressing at least a part including the distal end of a tube having an opening at each of the distal end and the proximal end and having a perfect cross-sectional shape and a lumen formed therein, the cross-sectional shape Forming a catheter tube in which an elliptical flat part is formed;
Bonding guide wire insertion tubes each having an opening at a distal end and a proximal end to the flat portion of the catheter tube;
A method for manufacturing a suction catheter.

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