JP6391910B2 - Aspiration catheter - Google Patents

Description

  The present invention relates to a suction catheter that sucks and removes debris (foreign matter) such as thrombus and atheromas released in blood vessels from blood vessels.

  2. Description of the Related Art A suction catheter for sucking and removing foreign matters such as thrombus existing in blood vessels has been known. The suction catheter includes a main tube having a suction lumen for sucking foreign matter inside. When aspirating a thrombus in a blood vessel using a suction catheter, the treatment person first inserts the suction catheter into the blood vessel and moves it, so that the thrombus exists in the opening formed at the tip of the main tube To reach the place to be treated. Then, by using the suction tool attached to the base end portion of the main tube to make the suction lumen negative, the thrombus is sucked and removed through the lumen.

  Patent Document 1 describes a suction catheter that includes a main tube and a guide tube that is joined to the outside of the distal end portion of the main tube and has a guide wire lumen inside. When the suction catheter is transported to a treatment target site in the body, the suction catheter is transported along a guide wire previously inserted into the body. Specifically, the catheter is transported to the treatment target site with the guide wire inserted through the guide wire lumen.

JP 2004-65326 A

  In the above-described suction catheter in which the guide tube is disposed outside the main tube, the main tube and the guide tube are disposed side by side in a direction orthogonal to the axial direction. Therefore, when the suction catheter is transported along the guide wire, the main tube is separated from the guide wire by at least the outer diameter of the main tube on the side opposite to the side where the guide tube is disposed. When a guide wire is disposed in a bent blood vessel, the guide wire may be disposed on the outer peripheral side or inner peripheral side of the blood vessel along the blood vessel wall of the bent blood vessel. At this time, if the suction catheter is transported along the guide wire, the opening on the opposite side of the distal end opening of the suction catheter to the side where the guide wire is disposed interferes with the blood vessel wall and the insertion property of the suction catheter is reduced. There is a risk. In particular, when the suction catheter is inserted beyond the stent placed in the blood vessel, the distal end side opening of the suction catheter may interfere with the stent and may significantly reduce the insertion property of the suction catheter.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide an aspiration catheter with good insertion into a bent blood vessel.

  The present invention is a suction catheter comprising a main tube having a suction lumen for sucking foreign matter, and a guide tube having a guide wire lumen arranged in a direction orthogonal to the axial direction of the main tube and through which the guide wire is inserted. The guide tube has a guide tube main body with a tip protruding from a tip of the main tube, and a tip having an outer diameter larger than the outer diameter of the guide tube main body provided at the tip of the guide tube main body. A suction catheter having a tip member, wherein the tip tip member and the main tube are separated from each other.

  According to the present invention, the guide tube has a distal tip member that is provided at a distal end portion of the guide tube main body and has an outer diameter larger than the outer diameter of the guide tube main body. Even if the guide wire is disposed on the outer peripheral side or the inner peripheral side of the blood vessel along the blood vessel wall of the bent portion of the blood vessel, the guide wire is inserted into the guide tube provided with the distal tip member so that the guide wire is inserted into the blood vessel. It is arranged toward the center side. Specifically, since the outer diameter of the guide tube main body is larger than the outer diameter of the guide tube body, the guide wire is disposed toward the center of the blood vessel by the thickness of the tip member. As a result, the guide tube on the proximal end side with respect to the distal tip member extends along the guide wire, whereby interference between the distal opening of the suction catheter and the blood vessel or interference with the stent can be suppressed. Therefore, the insertion property of the suction catheter into the bent blood vessel can be improved. The tip member and the main tube are separated from each other. Therefore, a region where the tip tip member is not provided can be formed between the tip tip member and the main tube. Of the distal end portion of the guide tube, the region where the distal end tip member is not provided is more flexible than the region where the distal end tip member is provided, so that a decrease in followability of the distal end portion of the guide tube to the guide wire is suppressed. Can do. Therefore, the insertion property of the suction catheter into the bent blood vessel can be improved.

  Further, in the present invention, the guide tube body includes a distal guide tube body that forms a distal end portion of the guide tube body, and a proximal guide tube body that is proximal to the distal guide tube body. The side guide tube main body is an aspiration catheter characterized in that it is made of a material more flexible than the proximal end side guide tube main body.

  According to the present invention, the distal end portion of the guide tube body is formed of a distal end side guide tube body that is more flexible than the proximal end side guide tube body. This makes it possible to more flexibly form the region of the distal end portion of the guide tube where the distal end tip member is not provided, so that it is possible to suppress a decrease in followability of the distal end portion of the guide tube to the guide wire. Therefore, the insertion property of the suction catheter into the bent blood vessel can be improved.

  Further, the present invention is the suction catheter, wherein the distal tip member has a tapered region whose outer diameter increases from the distal end toward the proximal end side.

  According to the present invention, the distal tip member has a tapered region whose outer diameter increases from the distal end toward the proximal end side, so that it is possible to suppress the catch between the distal tip member and the blood vessel. Therefore, the insertion property of the suction catheter into the bent blood vessel can be improved.

FIG. 2 is a schematic overall side view showing a configuration of a suction catheter. (A) is a longitudinal cross-sectional view which shows the structure of a catheter main body, (b) is a side view which shows the structure. (A) is a longitudinal cross-sectional view which shows the structure of the front-end | tip part of an aspiration catheter, (b) is a side view which shows the structure. It is a cross-sectional view which shows the structure of a catheter main body, (a) is the AA line cross section of Fig.2 (a), (b) is a BB line cross section, (c) is a CC line cross section, (d ) Shows a cross section taken along the line DD.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic overall side view showing the configuration of a suction catheter. As shown in FIG. 1, the suction catheter 10 has a length of 1 m to 2 m, and includes a catheter body 11 and a hub 12 attached to a proximal end portion of the catheter body 11. The catheter body 11 includes a main tube 14 and a guide tube 15 provided on the distal end side of the main tube 14 and is formed by joining the tubes 14 and 15 by welding. The main tube 14 has a suction lumen 17 therein, and the guide tube 15 has a guide wire lumen 18 into which a guide wire is inserted.

  The hub 12 has a fluid passage 12 a communicating with the suction lumen 17 of the main tube 14 inside. A syringe is connected to the hub 12 as a suction tool. By applying a negative pressure to the suction lumen 17 using the syringe, thrombus can be sucked through the lumen 17. Incidentally, as such a suction tool, an electric vacuum pump or the like is used in addition to a syringe.

  Next, the configuration of the catheter body 11 will be described in detail with reference to FIGS. 2, 3 and 4. 2A is a longitudinal sectional view showing the configuration of the catheter body 11, and FIG. 2B is a side view showing the configuration. 3A is a longitudinal sectional view showing the configuration of the distal end portion of the catheter main body 11, and FIG. 3B is a side view showing the distal end portion of the catheter main body 11. 4A and 4B are cross-sectional views showing the configuration of the catheter body 11, wherein FIG. 4A is a cross-sectional view taken along line AA in FIG. 2A, FIG. 4B is a cross-sectional view taken along line BB, and FIG. A line section and (d) show a DD line section. Incidentally, the longitudinal section is a section parallel to the longitudinal direction (axial direction) of the catheter body 11, and the transverse section is a section orthogonal to the longitudinal direction.

  The catheter body 11 is formed by welding the main tube 14 and the guide tube 15 as described above. The main tube 14 includes a proximal-side main tube 21 and a distal-side main tube 22 provided on the distal end side of the proximal-side main tube 21, and the tubes 21 and 22 are joined to each other by welding. .

  In this specification, “welding” means not only the case where the materials of the respective members to be joined are joined (fused) by melting, but also the respective members to be joined are formed by heat shrinkable tubes. By covering and heating, etc., it means that one member of each member melts and is joined to the other member.

  The proximal end main tube 21 constitutes a predetermined range from the proximal end portion toward the distal end side in the main tube 14. The proximal-side main tube 21 has a tubular shape, and has a lumen 21a that extends continuously over the entire longitudinal direction. The proximal end main tube 21 has a multilayer structure in which a plurality of types of materials including a synthetic resin are laminated. Specifically, the proximal-side main tube 21 constitutes a predetermined range from the distal end portion toward the proximal side, and the guide tube placement region 24 in which the guide tube 15 is placed on the outer peripheral side thereof, and the same region 24. It has a guide tube non-arrangement region 25 in which the guide tube 15 is not arranged on the outer peripheral side. In the guide tube non-arrangement region 25, the proximal-side main tube 21 is a braid made of a fluorine resin such as Teflon (registered trademark) as an inner layer 27, a polyamide elastomer as an outer layer 28, and a metal as an intermediate layer 29 (corresponding to a reinforcing layer). It has a three-layer structure (see FIG. 4D) made of the body 31.

  The braided body 31 is a reinforcing body for reinforcing the proximal end main tube 21, and an intermediate layer 29 formed using the braided body 31 is a braided layer. As shown in FIG. 3B, the braided body 31 is formed by knitting stainless wire into a mesh shape. The resin of the outer layer 28 enters between the plurality of wires in the braided body 31 and is welded to the inner layer 27 at the portion where the resin enters. In FIG. 2A and FIG. 4, for convenience, the intermediate layer 29 is shown in a state where gaps between the wire members of the braided body 31 are filled.

  On the other hand, in the guide tube arrangement region 24, the outer layer 28 is not provided among the layers 27 to 29, and a two-layer structure including the inner layer 27 and the intermediate layer 29 (see FIG. 4C) is formed. In this case, the outer layer 28 described later is provided on the outer peripheral side of the intermediate layer 29 of the base end side main tube 21, so that the resin of the outer layer 28 enters between the plurality of wires in the braided body 31, and the inner layer in the portion where the resin enters. 27 is welded.

  The front end side main tube 22 is formed in a tubular shape by a polyamide elastomer and has a single layer structure (see FIG. 4A). That is, unlike the proximal end main tube 21, the distal end side main tube 22 does not have the braided body 31, and therefore has a lower rigidity and is more flexible than the proximal end main tube 21. The distal-side main tube 22 has a lumen 22a extending continuously over the entire length in the inside thereof. The lumen 22a communicates with the lumen 21a of the proximal main tube 21 on the proximal end side, and the suction lumen 17 is formed by each of the lumens 21a and 22a. In the present embodiment, the diameters of the lumens 21a and 22a are substantially the same, and therefore the diameter of the suction lumen 17 (lumen diameter) is substantially constant throughout the longitudinal direction of the main tube 14. However, the diameters of the lumens 21a and 22a may be different, that is, the diameter of the lumen 21a may be larger or smaller than the diameter of the lumen 22a.

  The lumen 22 a is opened by a distal end opening 33 for taking in a foreign substance such as a thrombus formed at the distal end of the distal main tube 22 into the suction lumen 17. The distal end side end surface of the distal end side main tube 22 is inclined with respect to the axial direction of the main tube 22, and the distal end side opening portion 33 is widened toward the proximal end side from the distal end of the distal end side main tube 22. It is formed along the slope. In this case, compared with the case where the front end side opening 33 is formed along the direction orthogonal to the axial direction, the opening area of the front end side opening 33 can be increased, and the foreign matter suction performance can be improved. . Specifically, the distal opening 33 has a curve that is convex from the distal end of the distal main tube 22 toward the distal end and a curve that is convex toward the proximal end when the suction catheter 10 is viewed from the side. Are formed so as to form a gentle S-shaped curve as a whole and to incline with respect to the axial direction. The shape of the distal end side opening 33 may be formed so as to be inclined with respect to the axial direction of the distal end side main tube 22 (main tube 14) so as to expand from the distal end of the main tube 14 toward the proximal end side. For example, the suction catheter 10 may be linearly inclined as viewed from the side, and a curve that protrudes from the distal end of the distal-side main tube 22 toward the proximal end side and a curve that protrudes toward the distal end side And may be formed to be continuous with each other.

  As shown in FIG. 4A, the peripheral wall portion 37 (resin layer made of polyamide elastomer) surrounding the lumen 22a in the distal end side main tube 22 has a different thickness in the circumferential direction. Specifically, the peripheral wall portion 37 is a thick portion 37a formed thick at a portion where the guide tube 15 is disposed as described later, whereas the peripheral wall portion 37 is thick with the lumen 22a interposed therebetween. A thin portion 37b is formed at a portion opposite to the portion 37a.

  The proximal end portion of the distal end side main tube 22 is welded to the distal end portion of the proximal end side main tube 21. The proximal end side of the distal-side main tube 22 has a diameter-increased portion 35 that is expanded in diameter relative to other portions, and the proximal-side main tube 21 is located inside the enlarged-diameter portion 35 (inner lumen 22a). The tip side of is inserted. Hereinafter, the inserted portion is referred to as an insertion portion 39. And in this insertion state, the base end side main tube 21 and the front end side main tube 22 are joined by welding.

  Here, the diameter expansion in the diameter expansion portion 35 is based on the stretchability of the distal end side main tube 22, and the diameter expansion portion 35 is formed by extending the distal end side main tube 22 in the radial direction. In the enlarged diameter portion 35, the thin portion 37b of the peripheral wall portion 37 is displaced radially outward with respect to the axis of the lumen 22a, while the thick portion 37a is radial with respect to the axis of the lumen 22a. There is no displacement. Therefore, a stepped portion 38 is formed on the thin portion 37b side at the boundary portion between the enlarged diameter portion 35 and the other portion in the peripheral wall portion 37 of the distal end side main tube 22, whereas such a step is formed on the thick portion 37a side. The part is not formed.

  The guide tube 15 is provided in a guide tube main body 50 in which the distal end portion 50a extends from the distal end of the main tube 14 to the distal end side in a direction orthogonal to the axial direction of the main tube 14, and the distal end portion 50a of the guide tube main body 50. The distal end tip member 44 has an outer diameter larger than the outer diameter of the guide tube body 50.

  The guide tube main body 50 is formed in a tubular shape, and has a lumen (guide wire lumen 18) extending in the entire longitudinal direction inside thereof. The guide tube main body 50 is provided so as to extend over both the proximal end side main tube 21 and the distal end side main tube 22 in the axial direction of the main tube 14. Further, the guide tube main body 50 is provided in a state in which the distal end portion 50a extends to the distal end side from the main tube 14 (the distal end side main tube 22).

  The guide tube main body 50 is disposed on the outer peripheral side with respect to the base side main tube 21, and is disposed on the inside (specifically, on the inner side of the outer peripheral surface) with respect to the distal end side main tube 22. . Specifically, the guide tube main body 50 is provided so as to penetrate the distal end main tube 22 in the axial direction through the thick portion 37a of the tube 22 (see FIG. 4A). In the arrangement state of the guide tube main body 50, the lumen of the tube 50 extends in the same direction as the suction lumen 17 of the main tube 14. Therefore, the suction lumen 17 and the guide wire lumen 18 are orthogonal to the axial direction. It is lined up in the direction. Hereinafter, the arrangement direction of the lumens 17 and 18 is referred to as a first direction X, and a direction orthogonal to the first direction X and the axial direction is referred to as a second direction Y.

  The distal tip member 44 has an outer diameter larger than the outer diameter of the guide tube body 50. Specifically, the tip part 44 has a maximum outer diameter portion 44a formed with the largest thickness among the tip parts in the axial direction of the tip part 44 of the tip part 44. The outer diameter of the outer diameter portion 44 a is set to be 1.5 to 3 times the outer diameter of the guide tube body 50. Further, the outer diameter of the maximum outer diameter portion 44 a of the tip member 44 is set to be ¼ to ½ of the maximum outer diameter of the tip-side main tube 14. Further, the distal tip member 44 is formed with a tapered region 44b whose outer diameter increases from the distal end toward the proximal end side. Specifically, the tapered region 44b is formed on the distal end side of the maximum outer diameter portion 44a so that the maximum outer diameter portion 44a is located on the proximal end side with respect to the axial center of the distal tip member 44.

  The tip member 44 is provided so as to be separated from the main tube 14. As a result, a region of only the guide tube main body 50 is formed between the proximal end of the distal end tip member 44 and the distal end side main tube 22. The tip member 44 is formed by covering a tip portion 50a of the guide tube body 50 with a polyamide elastomer tube and thermally welding the tube. The distal tip member 44 is formed using a material that is more flexible than the material that forms the distal guide tube. Specifically, the tip member 44 is formed using a polyamide elastomer equivalent to a Shore D hardness of 40. The tip of the tip member 44 extends further to the tip than the tip of the guide tube body 50a. The lumen of the distal guide wire opening 44c formed by the distal tip member 44 has substantially the same diameter as the inner diameter of the guide wire lumen 18, and the lumen of the distal guide wire opening 44c and the guide wire lumen are formed. 18 communicates with no step.

  The guide tube body 50 includes a distal guide tube body 40 that forms a distal end portion 50 a of the guide tube body 50, and a proximal guide tube body 45 that is proximal to the distal guide tube body 40. . The distal end side guide tube main body 40 is formed of a material that is more flexible than the proximal end side guide tube main body 45. Specifically, the distal end side guide tube body 40 is made of a polyamide elastomer equivalent to Shore D hardness 59, and the proximal side guide tube body 45 is made of polyamide equivalent to Shore D hardness 72. Each of these tubes 40, 45 has inner lumens 40a, 42a, 41a extending continuously in the entire longitudinal direction inside thereof, and these inner lumens 40a, 42a, 41a communicate with each other. The guide wire lumen 18 is formed by the lumens 40a, 42a, 41a. Further, the distal end side guide tube main body 40 and the proximal end side guide tube main body 45 have the same cross section. The guide tubes 40 and 45 are arranged so that their axis lines are located on the same straight line and in a state where the end faces of each other are abutted with each other, and the end faces are joined by welding in the arrangement state. Yes.

  The distal end side guide tube main body 40 is joined to the distal end side main tube 22 by welding. A part of the distal-side guide tube main body 40 is embedded in a thick portion 37 a in the peripheral wall portion 37 of the distal-side main tube 22, and is welded to the distal-side main tube 22 in the embedded state. In this case, similarly to the first proximal guide tube main body 42 described later, a part of the distal guide tube main body 40, specifically, a peripheral wall portion surrounding the lumen 40 a in the same tube 40, is embedded in the distal main tube 22. Instead, it is a non-buried portion, and the non-buried portion is provided so as to partially protrude in the inner cavity 22 a of the distal end side main tube 22. By this non-embedded portion, the lumen 22a of the distal end side main tube 22 and the lumen 40a of the distal end side guide tube main body 40 are partitioned. In such a configuration, in the first direction X, the separation distance from the center portion P1 (axial position) of the lumen 22a to the distal guide tube 40 is from the center portion P1 of the lumen 22a to the peripheral wall portion (thin portion 37b). It is smaller than the separation distance. The distal-side guide tube main body 40 is disposed on the inner side of the outer peripheral surface of the distal-side main tube 22 and does not protrude from the outer peripheral surface.

  The distal side guide tube 40 has an axial length (full length) shorter than the axial length (full length) of the distal side main tube 22. The distal side guide tube body 40 is provided so as to include a region where the distal side opening 33 is formed. Specifically, the distal end side guide tube main body 40 is disposed in a state where the proximal end portion thereof is aligned with the proximal end of the distal end side opening 33, and in this disposed state, the distal end side guide tube 40 is disposed at the distal end side main body. A distal end portion 50 a of the guide tube body 50 is formed by extending toward the distal end side of the distal end portion of the tube 22.

  The proximal guide tube main body 45 may be formed by one tube member or may be formed by using two or more tube members. In this embodiment, the proximal end guide tube main body 45 is formed from the first proximal end guide tube main body 42 and the second proximal end guide tube main body 41 from the distal end side. The first base end side guide tube main body 42 and the second base end side guide tube main body 41 of the present embodiment are both made of polyamide having a Shore D hardness of 72.

  The second base end side guide tube main body 41 is joined to the base end side main tube 21 by welding. The second proximal-side guide tube main body 41 is disposed on the outer peripheral surface (the outer peripheral surface of the intermediate layer 29) in the guide tube arrangement region 24 of the proximal-side main tube 21 so as to extend in the same direction as the main tube 21. ing. Here, the outer peripheral surface of the guide tube arrangement region 24 corresponds to the second tube arrangement portion.

  The second base end side guide tube main body 41 has an axial length (full length) shorter than the length in the same direction of the guide tube arrangement region 24, and the base end portion of the second base end side guide tube main body 41 is the base of the guide tube arrangement region 24. It arrange | positions in the state aligned with the edge part. In this case, a part of the base end side main tube 21 (guide tube arrangement region 24) extends to the tip end side with respect to the second base end side guide tube main body 41, and the extended portion is the tip end side main tube. The insertion portion 39 is inserted into the enlarged diameter portion 35 of 22.

  As shown in FIG. 4C, the base end side main tube 21 and the second base end side guide tube body 41 are covered with an outer layer 60 in the guide tube arrangement region 24. The outer layer 60 is made of polyamide and is welded to the second base end side guide tube main body 41 and the base end side main tube 21. Thereby, the base end side main tube 21 and the second base end side guide tube main body 41 are welded to each other through the outer layer 60.

  The outer layer 60 is formed along the outer peripheral surface of the base end side main tube 21 and forms a layer surrounding the tube 21 from the outside. The outer layer 60 has a different thickness in the circumferential direction. Specifically, the outer layer 60 has a thick portion 37a formed thick at a portion on the side where the second proximal end guide tube body 41 is disposed. The thin portion 37b is formed thin at a portion opposite to the thick portion 37a across the proximal end main tube 21. And the 2nd base end side guide tube main body 41 is embed | buried under the thick part 37a in the outer layer 60. FIG.

  On the base end side of the outer layer 60, a portion on the side where the second base end side guide tube main body 41 is arranged in the circumferential direction extends to the outer layer 28 in the guide tube non-arrangement region 25 and is welded to the outer layer 28. Yes. And the base end side guide wire opening part 56 penetrated to an axial direction is formed in the said site | part. The proximal-side guide wire opening 56 is formed at a position corresponding to the proximal-end opening of the second proximal-side guide tube body 41 (and thus the guide tube 15), and the guide wire is passed through the proximal-side guide wire opening 56. The guide tube 15 can be pulled out from the guide wire lumen 18.

  The insertion portion 39 in the guide tube arrangement region 24 of the base end side main tube 21 is not covered with the outer layer 60, and the distal end side main tube 22 is arranged and welded to the outer peripheral side as described above. Yes. And the proximal end part of the front end side main tube 22 and the distal end part of the outer layer 60 are welded in the state which mutually faced each other.

  The first proximal guide tube main body 42 is joined to the distal main tube 22 by welding. As shown in FIG. 4A, a part of the first proximal end side guide tube main body 42 is embedded in a thick portion 37a in the peripheral wall portion 37 of the distal end side main tube 22, and the distal end in the embedded state It is welded to the side main tube 22. In this case, a part of the first base end side guide tube main body 42, specifically, the peripheral wall portion 47 surrounding the inner cavity 42a in the tube 42, is not embedded in the distal end side main tube 22, but is a non-embedded portion 47a. The non-embedded portion 47 a is provided so as to partially protrude into the inner cavity 22 a of the distal end side main tube 22. The non-embedded portion 47a partitions the lumen 22a of the distal main tube 22 and the lumen 42a of the first proximal guide tube main body 42. Further, in such a configuration, in the first direction X, the separation distance from the center portion P1 (axial position) of the lumen 22a to the first proximal guide tube main body 42 is such that the center wall P1 of the lumen 22a and the peripheral wall portion 37 ( It is smaller than the separation distance to the thin portion 37b). In addition, the 1st base end side guide tube main body 42 is arrange | positioned inside the outer peripheral surface of the front end side main tube 22, and does not protrude from the same outer peripheral surface.

  The first base end side guide tube main body 42 has an axial length (full length) shorter than an axial length (full length) of the distal main tube 22. The first base end side guide tube main body 42 is disposed in a state where the base end portion thereof is aligned with the base end portion of the front end side main tube 22. The distal end portion is aligned with the proximal end of the distal end side opening 33 of the distal end side main tube 22 and is retracted to the proximal end side from the distal end of the distal end side main tube 22.

  Further, the first base end side guide tube main body 42 partially overlaps with the base end side main tube 21 in the axial direction on the base end side, and the outer peripheral surface at the overlapping portion is the base end side main tube 21 ( Specifically, it is in contact with the outer peripheral surface of the insertion portion 39). In the contact state, the first proximal guide tube main body 42 and the proximal main tube 21 are welded to each other. Specifically, as shown in FIG. 4B, in the overlapping portion, the first base end side guide tube main body 42 and the base end side main tube 21 are both covered by the peripheral wall portion 37 of the front end side main tube 22. The first base end side guide tube main body 42 and the base end side main tube 21 are welded to the peripheral wall portion 37, respectively. That is, the first base end side guide tube main body 42 and the base end side main tube 21 are welded via the peripheral wall portion 37.

  Next, the dimensional relationship of the catheter body 11 will be described. In the region where the main tube 14 and the guide tube 15 are arranged side by side in the axial direction (longitudinal direction) of the catheter body 11, the transverse direction (cross section in the direction orthogonal to the axial direction) of the catheter body 11 is the first direction. The width dimension W1 of X is larger than the width dimension W2 in the second direction Y. Therefore, the catheter main body 11 has an elliptical shape whose cross section is long in the first direction X in the juxtaposed region of the tubes 14 and 15.

  Specifically, in the catheter main body 11, a guide tube 15 (specifically, the first proximal end guide tube main body 42) is partially embedded in the main tube 14 (specifically, the distal end side main tube 22); A proximal end portion that is proximal to the distal end portion and in which the guide tube 15 (specifically, the second proximal end guide tube main body 41) is disposed outside the main tube 14 (specifically, the proximal main tube 21); Thus, when comparing the dimension ratio W1 / W2 of the width dimension, the dimension ratio W1 / W2 at the distal end portion is smaller than the dimension ratio W1 / W2 at the proximal end portion. Therefore, in this catheter main body 11, the base end part has an elliptical shape closer to a perfect circle than the distal end part.

  As can be seen from FIGS. 4A and 4C, the catheter body 11 having the above-described configuration is seen from the distal end side where the suction lumen 17 and the guide wire lumen 18 are arranged in parallel. Each part has a different cross-sectional structure, and the part having the cross section of FIG. 4A is the “front end side tube 51”, and the part having the cross section of FIG. 3C is the “base end side tube 52”. ing. In this case, the distal end side tube 51 is configured to include the distal end side main tube 22, the distal end side guide tube main body 40, and the first proximal end side guide tube main body 42, and the proximal end side tube 52 is the proximal end side. The main tube 21, the second proximal-side guide tube body 41, and the outer layer 60 are configured.

  Here, in the distal end tube 51, the suction lumen 17 and the guide wire lumen 18 are partitioned by the peripheral wall portion 47 of the distal end side guide tube main body 40 and the first proximal end guide tube main body 42. Corresponds to “lumen partition wall”. The lumen partition wall (peripheral wall 47) is provided so as to protrude toward the central portion P1 of the suction lumen 17 (inner lumen 22a). In the proximal tube 52, the suction lumen 17 and the guide wire lumen 18 are partitioned by the proximal main tube 21 (inner layer 27 and intermediate layer 29) and the peripheral wall 48 of the second proximal guide tube body 41. The proximal-side main tube 21 (the inner layer 27 and the intermediate layer 29) and the peripheral wall portion 48 of the second proximal-side guide tube main body 41 correspond to a “lumen partition wall portion”. The lumen partition wall (the base end side main tube 21 and the peripheral wall portion 48 of the second base end side guide tube main body 41) is provided without protruding toward the central portion P1 of the suction lumen 17 (inner cavity 21a). It has been.

In such a configuration, the positions of the guide tubes 40, 41, 42 with respect to the suction lumen 17 are different. That is, since the distal end side guide tube main body 40, the first proximal end side guide tube main body 42, and the second proximal end side guide tube main body 41 are arranged coaxially, the central portions of the lumens 40a, 41a, 42a of each other Whereas P2 is at the same position in the first direction X, the center portion P1 (see FIG. 4A) of the lumen 22a of the distal end main tube 22 and the center of the lumen 21a of the proximal main tube 21 The position in the first direction X is slightly different from the part P1 (see FIGS. 4B to 4D). Specifically, in the first direction X, the center portion P1 of the lumen 22a is closer to the center portion P2 side of the guide wire lumen 18 than the center portion P1 of the lumen 21a. As described above, the distal end side tube 51 and the proximal end side tube 52 have different dimensional ratios W1 / W2 because the positions of the guide tubes 40, 41, 42 with respect to the suction lumen 17 are different. It has become.
As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  In the suction catheter 10 of the present embodiment, the guide tube 15 has a distal end tip member 44 provided at the distal end portion 50 a of the guide tube main body 50 and having an outer diameter larger than the outer diameter of the guide tube main body 50. Even if the guide wire is disposed on the outer peripheral side or the inner peripheral side of the blood vessel along the blood vessel wall of the bent portion of the blood vessel, the guide wire is inserted into the guide tube 15 provided with the distal tip member 44 so that the guide wire is inserted. Is disposed toward the center of the blood vessel by the thickness of the tip member 44. As a result, the guide tube 15 on the proximal end side with respect to the distal tip member 44 extends along the guide wire, whereby interference between the distal opening 33 and the blood vessel or stent can be suppressed. Therefore, the insertion property of the suction catheter 10 into the bent blood vessel can be improved. In the suction catheter 10 of the present embodiment, the distal tip member 44 and the main tube 14 are separated from each other. Accordingly, a region where the tip tip member 44 is not provided can be formed between the tip tip member 44 and the tip side opening 33 of the main tube 14. Since the region where the tip tip member 44 is not provided in the tip portion of the guide tube 15 is more flexible than the region where the tip tip member 44 is provided, the followability of the guide tube 15 to the guide wire is reduced. Can be suppressed. Therefore, the insertion property of the suction catheter 10 into the bent blood vessel can be improved.

  Further, in the suction catheter 10 of the present embodiment, the distal end portion 50 a of the guide tube main body 50 is formed by the distal end side guide tube main body 40 which is more flexible than the proximal end side guide tube main body 45. As a result, it is possible to more flexibly form a region of the distal end portion of the guide tube 15 where the distal end tip member 44 is not provided, thereby suppressing a decrease in followability of the distal end portion of the guide tube 15 to the guide wire. Can do. Therefore, the insertion property of the suction catheter 10 into the bent blood vessel can be improved.

  Further, the suction catheter 10 of the present embodiment forms the distal guide tube body 40 with a material more flexible than the proximal guide tube body 45, and the distal guide tube body 40 has the distal opening 33 formed. It is provided so as to include a region. As a result, it is possible to easily form the region in which the distal end side opening 33 is formed in a direction intersecting the axial direction. Therefore, even when the distal end opening 33 interferes with a blood vessel or a stent, the region where the distal end opening 33 is formed can be deformed and passed through the blood vessel or stent, and the insertion property of the suction catheter 10 can be improved. It can be good.

  Further, in the suction catheter 10 of the present embodiment, the distal end side guide tube main body 40 is formed of a polyamide elastomer that is more flexible than the proximal end side guide tube main body 45, and the proximal end side guide tube main body 45 is formed of polyamide. Generally, when the tube is formed of a flexible polyamide elastomer, the sliding resistance of the guide wire with respect to the inner surface of the tube is larger than when the tube is formed of polyamide. In the present embodiment, a proximal-side guide tube main body 45 having a relatively small sliding resistance with the guide wire is disposed from the proximal end to the proximal end of the distal-end opening 33 that occupies most of the guide tube arrangement region 24, and the guide Since the distal-side guide tube main body 40 is disposed from the proximal end of the distal-side opening 33 to the distal end side in the tube placement region 24, the insertion property of the suction catheter 10 is improved while suppressing a decrease in the operability of the guide wire. Can be.

  Further, the distal tip member 44 of the suction catheter 10 of the present embodiment has a tapered region 44b whose outer diameter increases from the distal end toward the proximal end side, so that the distal tip member 44 and the blood vessel are prevented from being caught. be able to. Therefore, the insertion property of the suction catheter 10 into the bent blood vessel can be improved.

  Further, in the suction catheter 10 of the present embodiment, in the axial direction (longitudinal direction) of the catheter body 11, in the distal tube 51, a lumen partition wall (specifically, distal guide) that partitions the suction lumen 17 and the guide wire lumen 18. Since the peripheral wall portion of the tube main body 40 and the peripheral wall portion 47 of the first proximal guide tube main body 42 are provided so as to protrude toward the central portion P1 of the suction lumen 17, the lumen partition wall portion of the tube 51 is the center of the suction lumen 17. The width dimension W1 in the first direction X in which the suction lumen 17 and the guide wire lumen 18 are arranged, that is, the maximum width dimension can be reduced as compared with the case where the suction lumen 17 and the guide wire lumen 18 are arranged without protruding toward the portion P1. On the other hand, in the proximal end tube 52, the lumen partition wall (specifically, Since the peripheral wall portion 48 and the base end side main tube 21 (the inner layer 27 and the intermediate layer 29) of the base end side guide tube 41 are provided without protruding toward the center portion P1 of the suction lumen 17, the The opening area of the suction lumen 17 is not narrowed by the partition wall, so that a decrease in the suction performance is suppressed, and in this case, a decrease in the insertion performance into the body can be suppressed and a decrease in the suction performance is suppressed. it can.

  In the suction catheter 10 of the present embodiment, the proximal tube 52 of the catheter body 11 has a braided body on the peripheral wall portion (the proximal main tube 21 (the inner layer 27 and the intermediate layer 29) and the outer layer 28) surrounding the suction lumen 17. The intermediate layer 29 (braided layer) is formed by embedding 31, and the distal tube 51 has a configuration in which no braided layer is formed on the peripheral wall portion 37 surrounding the suction lumen 17. In this case, rigidity can be increased on the proximal end side of the catheter body 11, while flexibility can be secured on the distal end side. Here, in this configuration, since the braided body 31 is embedded in the peripheral wall portion surrounding the suction lumen 17 in the proximal tube 52, the lumen partition wall portion projects toward the center portion P1 of the suction lumen 17. Is considered difficult. In this regard, in the above configuration, the guide wire lumen 18 is disposed outside the braided layer in the proximal tube 52, and the lumen partition wall portion is directed to the central portion P1 of the suction lumen 17 in the distal tube 51 having no braided layer. It is configured to protrude. In this case, in the catheter body 11 having the braided layer, the above-described effect of suppressing the deterioration of the insertion performance into the body and suppressing the decrease of the suction performance can be suitably obtained.

  Further, in the suction catheter 10 of the present embodiment, the dimension ratio W1 / W2 in the distal end tube 51 is set to the dimension ratio W1 / W2 in the proximal end tube 52 with respect to the dimension ratio W1 / W2 in the transverse dimension of the catheter body 11. Therefore, the cross-sectional shape of the catheter body 11 is closer to a perfect circle than the proximal tube 52 in the distal tube 51. In this case, regarding the bendability of the catheter body 11 on the distal end side of the catheter body 11, the bendability when the bending force in the first direction X is applied to the main body 11 and the bending force in the second direction Y are shown. The difference from the bendability when acted can be reduced. Therefore, the insertion property into the body of the catheter body 11 having the two lumens of the suction lumen 17 and the guide wire lumen 18 can be improved.

  In the suction catheter 10 of the present embodiment, in the distal tube 51 of the catheter body 11, the distal guide tube body 40 and the first proximal guide tube body are formed on the peripheral wall portion 37 of the main tube 14 (distal main tube 22). 42 was embedded, and the distal end side guide tube main body 40 and the first proximal end side guide tube main body 42 were protruded inside the suction lumen 17 in the embedded state. In this case, the distal-side guide tube main body 40 and the first proximal-side guide tube main body 42 with respect to the peripheral wall portion 37 are compared with the case where the distal-side guide tube main body 40 and the first proximal-side guide tube main body 42 are arranged in the suction lumen 17 without being embedded in the peripheral wall portion 37. And the joining strength of the 1st base end side guide tube main body 42 (as a result, guide tube 15) can be raised. Thereby, even when an excessive load is applied to the guide tube 15 when the guide wire is inserted into the guide tube 15, it is possible to suppress the inconvenience that the tube 15 is peeled off from the peripheral wall portion 37.

  Further, the suction catheter 10 of the present embodiment includes a catheter body 11 having a distal end tube 51 provided with a lumen partition wall projecting toward the central portion P1 of the suction lumen 17, and a lumen partition wall portion being the center of the suction lumen 17. The base end side tube 52 provided without projecting toward the portion P1 is configured, and the tubes 51 and 52 are joined by heat-welding each other end portion. In this case, when the catheter body 11 is manufactured, the distal end side tube 51 and the proximal end side tube 52 are first manufactured separately, and then the distal end side tube 51 and the proximal end side tube 52 are joined by heat welding. 11 can be manufactured. Thereby, the above-mentioned catheter main body 11 in which a structure differs in a front-end | tip part and a base end part can be manufactured suitably.

  The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  (1) In the embodiment described above, the configuration shown in FIG. 4A is used as the configuration in which the lumen partition wall portion is provided so as to protrude toward the central portion of the suction lumen 17, but this may be changed. For example, in the peripheral wall 47 of the distal guide tube main body 40 and the first proximal guide tube main body 42, the ratio of the portion embedded in the distal main tube 22 and the portion not embedded (non-embedded portion 47a) is shown in FIG. Different from (a), in the peripheral wall portion 47 of the distal end side guide tube main body 40 and the first proximal end guide tube main body 42, half or more of the circumferential direction may be set as the non-embedded portion 47a. In this case, the larger the non-embedded portion 47a, the larger the amount of protrusion that protrudes toward the central portion P1 of the suction lumen 17, and the width dimension W1 in the first direction X is smaller when viewed from the outer peripheral portion of the distal end side main tube 22. It will approach a true circle. That is, the dimensional ratio W1 / W2 is close to 1.

  In addition, the lumen partition wall that separates the suction lumen 17 and the guide wire lumen 18 is not composed of only the peripheral wall 47 of the distal guide tube body 40 and the first proximal guide tube body 42, but the distal main tube 22. The lumen partition wall portion may be constituted by (the molten resin of the distal main tube 22 melted at the time of tube welding) and the peripheral wall portion 47. In this case, the lumen partition wall protrudes toward the center of the suction lumen 17 while the distal guide tube body 40 and the first proximal guide tube body 42 are all embedded in the distal main tube 22. It becomes the composition which did.

  (2) In the above embodiment, the distal end portion (the distal end) of the width direction W1 in the first direction X in the region (parallel region) where the main tube 14 and the guide tube 15 are disposed side by side in the catheter body 11 is the same. The proximal end portion (proximal side tube 52) is made smaller than the side tube 51), but this may be changed to make the proximal end portion smaller than the distal end portion, or the distal end portion and the proximal end It may be the same for each part.

  (3) In the above embodiment, the distal guide tube main body 40, the first proximal guide tube main body 42, and the second proximal guide tube main body 41 are arranged coaxially in the guide tube 15, but this is changed. The tubes 40, 41, and 42 may be arranged so that the central portion P2 of the tubes 40, 41, and 42 is slightly different in the first direction X. Further, in the above-described embodiment, in the main tube 14, the central portion P1 of the proximal end side main tube 21 and the central portion P1 of the distal end side main tube 22 are arranged in slightly different positions in the first direction X. However, the tubes 21 and 22 may be arranged coaxially.

  At least one of the distal end side tube 51 and the proximal end side tube 52 may be formed as a single tube having both the suction lumen 17 and the guide wire lumen 18.

  In the proximal end main tube 21, it is possible to use other than the braided body as the reinforcing body provided on the peripheral wall portion surrounding the suction lumen 17. For example, even if the peripheral wall portion of the base end side main tube 21 is provided with a high-rigidity resin body using a resin material that is harder (rigid) than the resin material (polyamide elastomer) of the front end side main tube 22. Good. In this case, a reinforcing layer is formed by embedding a high-rigidity resin body in the peripheral wall portion of the base end side main tube 21.

  In the above embodiment, the proximal main tube 21 and the distal main tube 22 are joined, and the distal guide tube main body 40, the first proximal guide tube main body 42, and the second proximal guide tube main body 41 are joined. The joining of the proximal main tube 21 and the second proximal guide tube main body 41 and the joining of the distal main tube 22 to the distal guide tube main body 40 and the second proximal guide tube main body 41 are respectively performed. Although it was performed by welding, these joints may be performed by adhesion using an adhesive or a solvent.

DESCRIPTION OF SYMBOLS 10 ... Aspiration catheter, 14 ... Main tube, 15 ... Guide tube, 17 ... Suction lumen, 18 ... Guide wire lumen, 40 ... Tip side guide tube main body, 44 ... Tip member, 44b ... Tip member taper area, 45 ... Base End side guide tube body, 50 ... Guide tube body

Claims (3)

A suction catheter comprising a main tube having a suction lumen for sucking foreign matter, and a guide tube having a guide wire lumen through which the guide wire is inserted, which are arranged in a direction orthogonal to the axial direction of the main tube,
The guide tube includes a guide tube main body with a tip protruding from a tip of the main tube, a tip tip member provided at a tip of the guide tube main body and having an outer diameter larger than an outer diameter of the guide tube main body; The suction catheter is characterized in that the distal tip member and the main tube are separated from each other , and a region of only a guide tube main body is formed between the distal tip member and the main tube .   The guide tube body includes a distal guide tube body that forms a distal end portion of the guide tube body, and a proximal guide tube body that is proximal to the distal guide tube body. The suction catheter according to claim 1, wherein the suction catheter is made of a material that is more flexible than the proximal guide tube body.   The suction catheter according to claim 1, wherein the distal tip member has a tapered region whose outer diameter increases from the distal end toward the proximal end.

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