JP2007135628A - Blood channel expanding instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the quantity of blood flowing in the blood channel of a true lumen to secure the blood flow into a visceral artery by expanding the blood channel of the true lumen of the aorta with the aortic dissection from inside, and to prevent the ischemic state of the viscus. <P>SOLUTION: Liner elastic members 2 extending in the direction of the blood flow in the true lumen 115 are disposed in the shape of a cylindrical basket. Ends of the elastic members 2 are connected and the other ends of the elastic members 2 are also connected to one another. One side curved part 4 and another side curved part 3 are formed on one side and the other side of the elastic member 2, and a straight line part 5 is formed between the one side and the other side curved parts 4 and 3. The inner wall of the true lumen 115 is pressed outward by the straight line part 5 so that the blood channel of the true lumen 115 is expanded. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a blood channel dilator that expands the blood channel of the true lumen of the aorta where aortic dissection has developed.

  In recent years, the occurrence of aortic dissection has increased as one of the aortic diseases caused by arteriosclerosis and the like. Aortic dissection means that blood flowing through the aorta from an entry where a part of the intima tissue of the aorta has collapsed flows between the intima and adventitial tissues of the aorta. In the meantime, a dissociation space forming a blood flow path is generated separately from a true space forming a blood flow path through which blood flows normally.

  In aortic dissection, depending on the size of the entry and the degree of progression of arteriosclerosis, more blood may flow into the dissociated space than the true space. When this happens, the blood flowing into the dissociation cavity pushes the intimal tissue between the true cavity and the dissociation cavity to the true cavity side, and the outer membrane tissue swells to widen the blood flow path of the dissociation cavity. As described above, the intimal tissue is pushed toward the true lumen, thereby narrowing the blood flow path of the true lumen. When the blood flow path in the true lumen narrows in the vicinity of the visceral artery branching from the aorta, the blood flow to the visceral artery decreases, and the viscera becomes ischemic despite the occlusion of the visceral artery. May be. When the internal organs become ischemic, the most serious symptom is non-obstructive mesenteric ischemia in which the intestinal tissue becomes ischemic and a large amount of the intestine must be removed. .

In order to prevent the internal organs from becoming ischemic due to the above-mentioned dissection of the aorta, for example, using an incision tool for intimal tissue of an artery as disclosed in Patent Document 1, it is more peripheral than the entry. By incising the intimal tissue between the true cavity and the dissociation cavity on the side, the blood flowing through the blood flow path of the dissociation cavity is communicated with the blood flow path of the true cavity and the blood flow path of the dissociation cavity. The procedure of flowing into the blood flow path may be performed.
Japanese Patent Laid-Open No. 5-220158

  However, even if the blood flow path of the true lumen and the blood flow path of the dissociation cavity are communicated with each other using the incision tool of Patent Document 1, dissociation from the true cavity is caused by the blood flowing from the entry to the blood flow path of the dissociation cavity. Since the intimal tissue between the cavity and the lumen has been pushed to the true lumen, the true lumen blood flow path has already narrowed, so the amount of blood flowing from the dissociated blood flow path into the true lumen blood flow path is Hard to increase. As a result, the true lumen blood flow channel may remain narrow, preventing the viscera from becoming ischemic.

  The present invention has been made in view of such points, and the object of the present invention is to expand the true blood flow channel of the aorta that has developed aortic dissection from the inside, thereby reducing the true blood flow channel. The purpose is to prevent the internal organs from becoming ischemic by increasing the amount of flowing blood.

  In order to achieve the above object, in the present invention, the inner wall of the true lumen is pressed toward the outside of the true lumen by the elastic member.

  Specifically, in the first aspect of the invention, aortic dissection occurs in which blood in the aorta flows between the intima and outer membranes of the aorta to form a dissociation space and a true lumen in the aorta. The blood flow channel dilator placed in the blood flow channel of the true lumen of the aorta is a target.

  And it is set as the structure provided with the elastic member formed so that the inner wall of the said true lumen might be pressed toward the outward of this true lumen.

  According to this configuration, since the inner wall of the true lumen is pressed outward by the elastic member, the blood channel of the true lumen can be expanded to increase the blood flow rate of the blood channel. In addition, since the intimal tissue between the true cavity and the dissociation cavity is pressed toward the dissociation cavity, the blood flow path of the dissociation cavity is narrowed, so that the blood flow flowing from the entry into the blood flow path of the dissociation cavity is reduced. Decrease, and the reduced amount flows into the true blood flow channel. As a result, the blood flow amount flowing through the true blood flow channel is increased, and the blood flow amount flowing into the visceral artery can be secured.

  According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of elastic members are provided, and the elastic members are formed in a linear shape extending in the blood flow direction of the true lumen and arranged in the circumferential direction of the true lumen. The configuration is as follows.

  According to this configuration, since each elastic member extends in the blood flow direction of the true lumen, it is possible to reduce the degree to which the elastic member inhibits blood flow in the blood flow path of the true lumen. Moreover, the several location of the circumferential direction in the surrounding wall of a true cavity will be pressed by the elastic member.

  In the invention of claim 3, in the invention of claim 2, the one end portions of the elastic member are joined to each other, the other end portions are joined to each other, and the intermediate portion is formed to press the inner wall of the true lumen. And

  According to this configuration, since the elastic member is integrated at both ends, it is possible to prevent the elastic member from being separated when performing an operation of placing it in the blood channel of the true lumen.

  In the invention of claim 4, in the invention of claim 2, one end portions of the elastic member are coupled to each other, and the other side is formed to press the inner wall of the true lumen.

  According to this configuration, since the elastic member is integrated by joining one end portions thereof, it is possible to prevent the elastic member from being separated when performing the operation of placing in the blood channel of the true lumen. It becomes possible. Since the other side of the elastic member is formed so as to press the inner wall of the true lumen and is positioned on the outer peripheral portion of the blood flow channel, the degree to which the elastic member inhibits the blood flow in the true blood channel is further increased. It becomes possible to make it lower.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the elastic member is provided with a protrusion formed so as to be hooked on the inner wall of the true cavity.

  According to this configuration, since the protruding portion of the elastic member is caught on the inner wall of the true cavity, it is possible to suppress the elastic member from shifting to the distal side due to the blood flow flowing through the blood flow channel.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the protrusion protrudes toward the distal side in the blood flow direction of the true lumen.

  According to this configuration, the elastic member is pushed in the protruding direction of the protrusion by the blood flow flowing through the blood channel. Thereby, it becomes difficult for a projection part to remove | deviate from the inner wall of a true cavity.

  According to the first aspect of the present invention, since the inner wall of the true lumen is pressed outward by the elastic member, the blood flow path of the true lumen can be expanded and the blood flow path of the dissociation cavity can be narrowed. As a result, the amount of blood flowing through the true lumen blood flow path can be increased to ensure the amount of blood flowing into the visceral artery, and the visceral can be prevented from becoming ischemic.

  According to the invention of claim 2, since the elastic member is formed so as to extend in the blood flow direction of the true lumen, it is possible to reduce the degree of the elastic member inhibiting the blood flow in the blood flow channel of the true lumen. Furthermore, since the peripheral wall of the true cavity is pressed at a plurality of locations in the circumferential direction by the elastic member, the blood flow channel can be reliably expanded.

  According to invention of Claim 3, since the one end parts of the elastic member were couple | bonded and the other end parts were couple | bonded, the operation | work indwelling in the blood flow path of a true cavity can be made easy.

  According to invention of Claim 4, since the one end parts of the elastic member were couple | bonded together, the operation | work indwelling in the blood flow path of a true cavity can be made easy. Furthermore, since the other end of the elastic member is located at the peripheral edge of the blood flow path, the degree of the elastic member inhibiting the blood flow in the true blood flow path can be further reduced.

  According to the fifth aspect of the present invention, since the protruding portion of the elastic member is caught on the inner wall of the true cavity, it is possible to suppress the blood flow channel dilator from shifting to the distal side of the blood flow channel. As a result, the true blood flow path can be expanded as intended.

  According to the sixth aspect of the present invention, since the protruding direction of the protruding portion is the distal side in the blood flow direction, it is possible to suppress the protruding portion from being detached from the inner wall of the true lumen.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a blood flow channel dilator 1 according to an embodiment of the present invention. This blood flow channel dilator 1 is a true lumen 115 (shown in FIGS. 2 to 4) of an aorta 100 that has developed aortic dissection. ) To expand the blood flow path of the true lumen 115.

  The blood channel dilator 1 is configured in a substantially cylindrical cage shape by combining a plurality of linear elastic members 2. The length of the blood channel dilator 1 in the center line direction (vertical direction in FIG. 1A) is set to about 40 mm to about 60 mm. In this embodiment, the number of elastic members 2 is ten. For example, the number of the elastic members 2 may be eight or nine.

  The elastic member 2 is configured so that the longitudinal direction of the elastic member 2 substantially coincides with the blood flow direction of the true lumen 115 in a state where the blood flow channel dilator 1 is placed in the blood channel of the true lumen 115. Are arranged in the circumferential direction. As a constituent material of the elastic member 2, for example, a metal material or a resin material having a spring property such as a Ni—Ti alloy or stainless steel can be used.

  One end of each elastic member 2 (the lower end of the blood flow channel dilator shown in FIG. 1 (a)) is positioned on and near the center line at one end in the center line direction of the blood flow channel dilator 1. is doing. One end portions of these elastic members 2 are joined using a joining method such as welding. The other end of each elastic member 2 (the upper end of the blood flow channel dilator shown in FIG. 1A) is on the center line at the other end of the blood flow channel dilator 1 in the center line direction. Located in the vicinity. The other end portions of these elastic members 2 are also coupled to each other.

  On the one side with respect to the other end portion of the elastic member 2, the other-side curved portion 3 that is curved so as to be separated from the center line of the blood flow channel dilator 1 in the radial direction is provided. On the other side of one end of the elastic member 2, a one-side curved portion 4 that is curved so as to be radially away from the center line of the blood flow channel dilator 1 is provided in the same manner as the other-side curved portion 3. ing. Therefore, the outer diameter on the one side in the center line direction of the blood flow path expander 1 increases as it goes to the other side, while the outer diameter on the other side in the center line direction of the blood flow path expander 1 increases toward the one side. is doing.

  Between the other side bending part 3 and the one side bending part 4, a straight part 5 formed in a straight line extending substantially parallel to the center line of the blood flow channel dilator 1 is provided. The straight line portion 5 presses the inner wall of the true lumen 115 outward. The outer diameter of the part corresponding to the straight line part 5 of the blood flow channel dilator 1 is set to about 20 mm to about 30 mm, and is shorter than the length of the blood flow channel dilator 1 in the center line direction.

  The elastic member 2 is provided with a protrusion 6 formed so as to be caught on the inner wall of the true cavity 115. The projecting portion 6 extends along the straight portion 5 toward the other side in the center line direction of the blood flow channel expander 1, and then curves and extends outward in the radial direction of the blood flow channel expander 1. It extends toward one side in the line direction. A portion extending along the straight portion 5 of the protrusion 6 is fixed to the elastic member 2.

  Next, the case where the true lumen 115 of the aorta that has developed aortic dissection is expanded using the blood channel dilator 1 configured as described above will be described. First, the pathology of the aorta 100 system and aortic dissection will be described with reference to FIGS. The aorta 100 includes an ascending aorta 101, an arch aorta 102, a thoracic descending aorta 103, and an abdominal aorta 104. A coronary artery 105 branches off from the beginning of the ascending aorta 101. From the arch aorta 102, a right brachiocephalic artery 106, a left common carotid artery 107 and a left subclavian artery 108 are branched. From the abdominal aorta 104, the main four branches of the abdomen, that is, the left renal artery 110, the right renal artery 111, the celiac artery 112, and the superior mesenteric artery 113 are branched. Reference numeral 109 denotes a diaphragm.

  When the entry E is formed in the intimal tissue in the distal side of the bifurcation of the left subclavian artery 108 in the arch aorta 102, the blood in the arch aorta 102 is transferred from the entry E to the intima and outer membranes. Flows in between. The intima tissue is destroyed by the blood flowing between the intima tissue and the adventitia tissue, and the intima tissue and the adventitia tissue are peeled toward the peripheral side, which are also shown in FIGS. Thus, a dissociation cavity 114 is formed. In other words, in this aortic dissection, a true lumen 115 and a dissociation chamber 114 that form a normal blood flow path are formed in the arch aorta 102, the thoracic descending aorta 103, and the abdominal aorta 104. The inner diameter of the true lumen 115 is smaller than the inner diameter of the normal arch aorta 102 and smaller than the dissociation cavity 114, and is particularly narrow in the vicinity of the celiac artery 112 and the superior mesenteric artery 113. The entry E has a slit shape that is long in the circumferential direction of the arch aorta 102, and the longitudinal dimension is about 20 to 30 mm, and the width dimension is about 10 mm.

  As shown in FIGS. 5 and 6, the blood flow channel dilator 1 is inserted into the abdominal aorta 104 while being accommodated in the catheter 20. The catheter 20 is used in a medical field and is made of a resin material having flexibility. When the blood flow channel dilator 1 is inserted into the catheter 20, the other side curved portion 3 and the one side curved portion 4 of the elastic member 2 are elastically deformed radially inward to thereby change the blood flow channel dilator 1. Reduce the outer diameter. Then, the blood flow channel dilator 1 is inserted into the distal end portion in the insertion direction of the catheter 20 from one end portion in the center line direction and accommodated in the catheter 20. The protruding direction of the protruding portion 6 is directed to the proximal end side of the catheter 20 in a state where the blood flow channel dilator 1 is accommodated in the catheter 20.

  Further, a wire 21 is inserted into the catheter 20, and one end portion of the wire 21 is engaged with one end portion of the blood flow path dilator 1. The other end portion of the wire 21 protrudes outward from the proximal end portion of the catheter 20.

  Then, the skin of the patient's lower limb (not shown) is incised, and the catheter 20 is inserted into the artery of the lower limb. As shown in FIG. 6, the catheter 20 is moved in the direction of insertion into the artery, and the distal end is inserted into the abdominal aorta 104 from the common iliac artery 116 (shown in FIG. 2). Thereafter, as shown in FIG. 7, the other end portion of the wire 21 is pushed into the catheter 20, and the blood flow channel dilator 1 is pushed out from the distal end of the catheter 20 into the true lumen 115.

  The elastic member 2 is deformed radially outward at a portion of the blood channel dilator 1 that is pushed out from the catheter 20. Then, as shown in FIG. 8, when the blood flow channel dilator 1 is completely pushed out of the catheter 20, the shape of the elastic member 2 is restored to the shape before being accommodated in the catheter 20, and the straight portion 5 of the elastic member 2 is restored. Presses the inner wall of the true lumen 115 outward. Thereby, the blood flow path of the true lumen 115 is expanded, and the blood flow amount flowing through the blood flow path can be increased.

  At this time, the intimal tissue between the true cavity 115 and the dissociation cavity 114 is pushed toward the dissociation cavity 114, and the blood flow path of the dissociation cavity 114 becomes narrow. Decreases, and the decreased amount flows into the true lumen 115. Furthermore, since the elastic member 2 is formed in a linear shape, the degree to which the elastic member 2 inhibits the blood flow in the blood flow path of the true lumen 115 is low. As a result, the amount of blood flowing through the blood flow path of the true lumen 115 increases, and the amount of blood flowing into the visceral arteries such as the celiac artery 112 and the superior mesenteric artery 113 can be secured.

  Further, the protrusion 6 provided on the elastic member 2 is caught on the inner wall of the true cavity 115. At this time, since the blood flow channel dilator 1 is inserted so that the protruding direction of the protrusion 6 is on the distal side of the true lumen 115, the elastic member 2 is pushed by the blood flow through the blood flow channel. The protruding direction of the protrusion 6 is the same direction. As a result, the protruding portion 6 bites into the inner wall of the true lumen 115 and is difficult to come off from the inner wall.

  Further, since the number of the elastic members 2 is 10, it is possible to reliably expand the blood flow path of the true lumen 115 while reducing the force with which each elastic member 2 presses the inner wall of the true lumen 115. become. As a result, when the blood flow path of the true lumen 115 is expanded, it is possible to reduce the burden on the intimal tissue by avoiding the pressing force of the elastic member 2 acting locally on the intimal tissue. . Similarly, when the number of the elastic members 2 is eight or nine, it is possible to reduce the burden on the intimal tissue when the blood flow path of the true lumen 115 is expanded.

  Moreover, since the length of the blood flow path dilator 1 in the center line direction is set to about 40 mm to about 60 mm, it is possible to expand only a portion where the true lumen 115 needs to be expanded. As a result, the true lumen 115 does not have to be expanded to an unnecessary site, so that damage to the intimal tissue can be suppressed.

  Further, by making the length of the blood flow path expander 1 in the center line direction longer than the outer diameter of the portion corresponding to the straight line part 5 of the blood flow path expander 1, the contact part to the inner wall of the elastic member 2 Therefore, the blood flow channel dilator 1 is stabilized in the true lumen 115.

  Therefore, according to the blood flow channel dilator 1 according to this embodiment, the elastic member 2 presses the inner wall of the true lumen 115 outward, so that the blood flow channel of the true lumen 115 is expanded and the dissociation cavity is expanded. The blood flow path 114 can be narrowed. Furthermore, since the elastic member 2 is formed in a linear shape, the degree to which the elastic member 2 inhibits the blood flow in the blood flow path of the true lumen 115 can be reduced. As a result, the amount of blood flowing through the blood flow path of the true lumen 115 can be increased and the blood flow flowing into the visceral arteries 112 and 113 can be secured, and the visceral organ is prevented from becoming ischemic. Can do.

  Further, since each elastic member 2 is formed so as to extend in the blood flow direction of the true lumen 115, the degree to which the elastic member 2 inhibits the blood flow in the blood flow path of the true lumen 115 can be further reduced.

  In addition, since one end portions of the elastic member 2 are coupled to each other and the other end portions are coupled to each other, the elastic member 2 is separated when performing the operation of placing the blood flow channel dilator 1 in the blood flow channel of the true lumen 115. Can be prevented. Thereby, the operation | work which detains the blood flow path expansion tool 1 in the blood flow path of the true lumen 115 can be made easy.

  Further, since the protruding direction of the protruding portion 6 of the elastic member 2 is directed to the distal side in the blood flow direction, it is possible to suppress the protruding portion 6 from being detached from the inner wall of the true lumen 115. Thereby, it can suppress that the blood flow path expansion tool 1 shifts | deviates to the peripheral side of a blood flow path, and can expand the blood flow path of the true lumen 115 as aimed.

  Further, the blood flow path expander 1 may have a shape as in the first modification shown in FIG. In the first modification, the number of elastic members 30 is eight, and one end portions of the elastic members 30 are coupled to each other. On the other side of one end portion of the elastic member 30, a curved portion 31 that is curved so as to be separated from the center line of the blood flow channel dilator 1 in the radial direction is provided. On the other side of the elastic member 30, a straight portion 32 formed in a straight line extending substantially parallel to the center line of the blood flow channel dilator 1 is provided, and the straight portion 32 and the curved portion 31 are continuous. ing. The other end of the elastic member 30 is provided with a hole 33 through which an annular member 34 made of a thread or the like is inserted. For the annular member 34, for example, a bioabsorbable material such as polyglycolic acid fiber or collagen fiber can be used. The type of the bioabsorbable material is not particularly limited as long as it is conventionally used as a material for sutures and suture assisting materials in the medical field, for example, Medifit manufactured by JM Co., Ltd. (Registered trademark). Moreover, you may comprise the annular member 34 with the member which expands-contracts like rubber | gum etc., for example.

  The other end portion of the elastic member 30 is connected by the annular member 34, and the displacement beyond the center line in the radial direction is suppressed. The hole 33 is configured by bending the other end of the elastic member 30 into an annular shape. In addition, a protruding portion 35 is formed on the other end portion of the elastic member 30 so as to be continuous with a portion constituting the hole portion 33. The protrusion 35 is caught on the inner wall of the true cavity 115.

  By forming the other side of the elastic member 30 as in the first modification, the other side of the elastic member 30 is the center of the blood flow path of the true lumen 115 while the blood flow channel dilator 1 is placed in the true lumen 115. It will be located in the outer peripheral part away from. Thereby, the degree to which the elastic member 30 inhibits the blood flow in the blood flow path of the true lumen 115 can be further reduced.

  Further, the blood flow channel expander 1 may be configured by an elastic member 40 having a spiral shape as in Modification 2 shown in FIGS. 10 and 11. One end portion (the lower end portion in FIG. 10) of the elastic member 40 is located on and near the center line at one end portion in the center line direction of the blood flow channel dilator 1 and is integrated. Further, the other side (the upper side in FIG. 10) of the elastic member 40 is spaced radially outward from the center line of the blood flow channel dilator 1 and spirals around the center line of the blood flow channel dilator 1. It is formed in a shape. The other end of each elastic member 40 is provided with a hole 41 through which the annular member 34 of the first modification communicates. The other end portion of the elastic member 40 is connected by the annular member 34, and the displacement of the center line radially outward from the center line is suppressed from being necessary. Also with the blood flow path expander 1 of this modification 2, the blood flow path of the true lumen 115 can be expanded as intended by the spiral portion of the elastic member 40. Further, the blood flow channel dilator 1 of the second modification may be provided with a protrusion as in the first modification, and the protrusion may be hooked on the inner wall of the true lumen 115.

  In the blood flow path dilator 1 of Modification 2 above, a hook portion 42 is provided at one end of the elastic member 40, and when the symptoms of aortic dissection have settled, the blood flow as shown in FIGS. The channel dilator 1 can be recovered from the true lumen 115. The hook portion 42 is integrally formed with the elastic member 40. When collecting the blood channel dilator 1, the collecting tool 50 and the catheter 51 are used. The collection tool 50 is configured by a wire that can be inserted into the catheter 51, and one end portion is formed in a shape that is hooked on the hook portion 42. The collection tool 50 and the catheter 51 are inserted into the aorta 100 from the lower limb artery. Thereafter, one end portion of the recovery tool 50 is projected from the distal end portion of the catheter 51 and hooked to the hook portion 42 to be connected, and the recovery tool 50 is pulled from the proximal end portion of the catheter 51. At this time, since the elastic member 40 has a spiral shape around the center line of the blood flow path dilator 1, the hook portion 42 is rotated in the helical direction of the elastic member 40 by the collection tool 50, and is inserted into the catheter 51. By pulling, the diameter of the blood channel dilator 1 can be reduced smoothly. In this way, after the blood flow channel dilator 1 is accommodated in the catheter 51, it can be taken out of the body together with the catheter 51. The hook portion 42 can be provided in addition to the blood flow path expander 1 of the second modification. By providing the hook portion 42, the blood flow path expander 1 can be easily collected.

  Further, the blood flow channel expander 1 may be configured by combining the spiral elastic member 40 so as to form a substantially lemon shape, as in Modification 3 shown in FIGS. 14 and 15. The elastic member 40 is formed by linearly forming a superelastic material such as a Ni—Ti alloy, and the diameter of the elastic member 40 is about 0.2 mm. One end portion (the lower end portion in FIG. 14) of the elastic member 40 is located on and near the center line at one end portion in the center line direction of the blood flow channel dilator 1, and is coupled and integrated with each other. . Further, the other side (the upper side in FIG. 14) of one end of the elastic member 40 is separated radially outward from the center line of the blood flow channel dilator 1 and spirals around the center line of the blood flow channel dilator 1. It is formed in a shape. The other end portion of the elastic member 40 is positioned in the same manner as the one end portion described above, and is coupled and integrated with each other. At both ends in the center line direction of the blood flow channel dilator 1, hook portions 42 similar to those of the second modification are provided. Therefore, the blood flow path dilator 1 of this modification 3 can also be collected using the collection tool. The elastic member 40 is twisted. For example, the twisting process is performed by rotating the other end of the elastic member 40 around the center line of the elastic member 40 and applying a twisting force to the elastic member 40. . By twisting the elastic member 40 in this way, the surface of the elastic member 40 becomes spirally undulated, and when the elastic member contacts the intimal tissue of the true lumen 115, the elastic member 40 It becomes difficult to slip against the intimal tissue. Thereby, the position shift of the blood flow path dilator 1 is suppressed.

  As described above, the blood channel dilator according to the present invention is suitable for expanding the blood channel of the true lumen of the aorta that has developed aortic dissection.

The blood channel dilator which concerns on embodiment of this invention is shown, (a) is a perspective view, (b) is the top view seen from the centerline direction other side of the blood channel dilator. It is the schematic which shows the aortic system which aortic dissection developed. It is a perspective view of the abdominal aorta where aortic dissection developed. It is a longitudinal cross-sectional view of the abdominal aorta where aortic dissection developed. It is a figure explaining the state which accommodated the blood channel expansion tool in the catheter. FIG. 5 is a view corresponding to FIG. 4 showing a state where a catheter containing a blood flow channel dilator is inserted into the abdominal aorta. FIG. 5 is a view corresponding to FIG. 4 showing a state in which a part of the blood flow channel dilator is pushed out from the catheter. FIG. 5 is an enlarged view corresponding to FIG. 4 showing a state in which the blood channel of the true lumen is expanded by the blood channel dilator. It is FIG. 1 (a) equivalent figure which concerns on the modification 1 of embodiment. It is FIG. 1 (a) equivalent figure which concerns on the modification 2 of embodiment. FIG. 9 is a view corresponding to FIG. 8 according to a second modification of the embodiment. FIG. 9 is a view corresponding to FIG. 8, illustrating a state in the middle of housing the blood flow channel dilator according to the second modification of the embodiment in the recovery catheter. FIG. 9 is a view corresponding to FIG. 8 showing a state in which the blood flow channel dilator according to the second modification of the embodiment is housed in a recovery catheter. It is FIG. 1 (a) equivalent figure which concerns on the modification 3 of embodiment. FIG. 9 is a diagram corresponding to FIG. 8 according to Modification 3 of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blood flow path dilator 2 Elastic member 3 One side curved part 4 The other side curved part 5 Straight line part 6 Protrusion part 100 Aorta 114 Dissociation cavity 115 True cavity

Claims (6)

The blood in the aorta flows between the intima and outer membranes of the aorta, and a dissociation space and a true lumen are formed in the aorta. A blood channel dilator,
A blood flow channel dilator comprising an elastic member formed to press the inner wall of the true lumen toward the outside of the true lumen. The blood flow channel dilator according to claim 1,
A plurality of elastic members,
The blood flow channel dilator, wherein the elastic member is formed in a linear shape extending in the blood flow direction of the true lumen and arranged in the circumferential direction of the true lumen. The blood flow path dilator according to claim 2,
A blood flow channel dilator characterized in that one end portions of an elastic member are coupled to each other, the other end portions are coupled to each other, and an intermediate portion is formed to press the inner wall of the true lumen. The blood flow path dilator according to claim 2,
A blood flow channel dilator, wherein one end portions of an elastic member are joined to each other, and the other side is formed so as to press the inner wall of the true lumen. The blood flow channel dilator according to any one of claims 1 to 4,
A blood flow channel dilator, wherein the elastic member is provided with a protrusion formed so as to be caught on the inner wall of the true lumen. The blood flow path dilator according to claim 5,
The blood flow channel dilator, wherein the protrusion protrudes toward the distal side in the blood flow direction of the true lumen.

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