JP6539138B2 - Balloon catheter - Google Patents

Description

  The present invention relates to a balloon catheter, and more particularly, to a technology capable of securing blood flow even at the time of balloon expansion of a balloon catheter and of being crimped to a vascular lumen with a uniform expansion force. .

  Aortic aneurysm is a state in which a part of the blood vessel wall of the aorta is expanded, and is classified into thoracic aortic aneurysm, thoracoabdominal aortic aneurysm, and abdominal aortic aneurysm according to the position of the aneurysm. A blood vessel is composed of an intima, a tunica media, and a tunica adventitia, and the tunica media of the aortic blood vessel is peeled off in two layers and blood flows from the gap to form an aneurysm, which is called a dissociative aortic aneurysm. As a surgical treatment for aortic aneurysms, artificial blood vessel replacement has been performed as a standard operation to replace the site where the aneurysm has been made with artificial blood vessels, but recently, stent grafting using a catheter has been low. The number of cases is increasing for invasive purposes.

  Stent grafting is a procedure in which a stent graft in which a metal stent is covered with an artificial blood vessel is placed in the blood vessel longer than the aortic aneurysm onset site, and a catheter is inserted from the femoral artery while the stent graft is stored in a catheter. It is a method of guiding to the target site, expanding the stent and fixing it on the inner wall of the blood vessel, blocking the inflow of blood into the aneurysm, preventing thrombus formation of the aneurysm and preventing the spread. Unlike open heart surgery, this treatment method is a method of preventing the enlargement of the aneurysm without stopping the heart.

  However, when the stent graft is tightly fixed to the inner wall of the blood vessel, the stent graft needs to be expanded from the inside with a balloon catheter. At this time, the inflated balloon blocks the systemic circulation and causes ischemia in the lower limbs. Therefore, in order to shorten the blocking time as much as possible, the operator repeats inflation (inflation) and deflation (deflation) of the balloon while measuring time. Although stent grafting is a minimally invasive procedure, it is desirable to reduce the number of times since balloon inflation places a burden on the patient's body.

  At present, a balloon catheter in which a plurality of balloons are bundled at the tip of the catheter has already been proposed as a solution to blood flow blocking by the balloon. With this balloon catheter, even when the balloon is inflated, a gap is formed between the adjacent balloons and the balloon, so blood flow can be secured through this gap. However, in this balloon catheter, a gap between the balloons is formed, so that it is not possible to generate a uniform expansion force or a pressure contact force on the vascular lumen. In addition, in the blood volume flowing from the gap between the balloons, if the balloon is inflated for a long time, organ ischemia may occur.

  In view of the above-mentioned circumstances, the inventors have developed a technique capable of securing a blood flow even at the time of balloon expansion, and capable of being crimped to the lumen of the blood vessel with a uniform expansion force. Came to complete. Japanese Patent Application Laid-Open No. 7-5321 (Patent Document 1), etc. is known as a patent document considered to be a reference in connection with the present invention.

  In Patent Document 1, a catheter is adhesively fixed to the inner surface of a conduit type balloon, and when the balloon is inflated, a cavity is formed at the center thereof, and blood flow is maintained even in a state where the blood vessel wall is stretched and compressed. In the case of this catheter, there is a problem that when the balloon is inflated, the internal pressure of the balloon changes its shape and the hollow inside the balloon can not be held, and the blood flow can not be secured. The

JP 7-5321 A

  Therefore, in view of the above-mentioned conventional problems, the present invention can maintain the inner cavity of the balloon even when the balloon is expanded, and can ensure the blood flow, and also with a uniform expansion force to the blood vessel lumen. It is an object of the present invention to provide a balloon catheter that can be crimped.

In order to solve the above-mentioned subject, invention of Claim 1 makes an outer tube of predetermined length which front and rear end opened, and makes a tip part project from front end opening of an outer tube in this outer tube, and it is long-axis direction A balloon comprising an inner shaft slidably housed within the frame, a frame structure provided between the tip of the inner shaft and the tip of the outer tube, and a balloon attached to the outer surface of the frame In the catheter, the frame structure has a plurality of first members provided at predetermined intervals in an annular manner by pivoting one end on the tip of the inner shaft, and a tip of the outer tube. One end is pivotally supported, and the same number, the second aggregate provided in an annular shape, and the other end of each of the first aggregate and the second aggregate are pivotally supported respectively Few, and having a third bone material provided annularly, the. The frame structure has a plurality of aggregates which are radially spaced from each other at predetermined intervals in the circumferential direction facing the length direction of the inner shaft, and usually do not operate. By sliding the inner shaft to the tip side with respect to the outer tube, the aggregate is folded and folded so as to approach the inner shaft, and in operation, the inner shaft is moved rearward relative to the outer tube By sliding to the side, the aggregate is erected so as to be separated outward from the inner shaft, and a gap is created between the inner shaft and the balloon to ensure blood flow in the longitudinal direction in the aggregate. It is characterized by being made possible.

Delete

The invention according to claim 2, in the balloon catheter of claim 1, the first aggregate and second aggregate consists substantially equal length, the third aggregate, first aggregate and second It is characterized in that the length is formed longer than the aggregate, and the third aggregate is parallel to the inner shaft in a state of standing up at the time of operation.

The invention according to claim 3 is characterized in that in the balloon catheter according to claim 1 or 2 , the balloon is a toroidal balloon.

According to a fourth aspect of the present invention, in the balloon catheter according to the third aspect, the balloon is provided with a base sheet on the inner peripheral surface thereof, and the base sheet is attached to the third aggregate of the framework. It is characterized by being adhered to the body.

The invention according to claim 5 is the balloon catheter according to claim 4 , wherein the adhesive body has a body portion having a length equal to that of the third aggregate and a semicircular cross section. An axial hole is formed in the interior substantially at the center in the longitudinal direction of the main body, and a third aggregate is inserted into the axial hole, and a base sheet of the balloon is formed on the flat outer surface. Are adhered.

The present invention is as described above, and according to the invention as set forth in claim 1, the outer tube having a predetermined length with its front and rear ends open, and the tip portion of this outer tube protrudes from the front end opening of the outer tube An inner shaft slidably housed in the long axis direction, a frame structure provided between the tip of the inner shaft and the tip of the outer tube, and a balloon attached to the outer surface of the frame structure And a plurality of annular members provided at predetermined intervals in an annular manner, and the outer tube. The second aggregate provided in the same number and annular shape by pivotally supporting one end on the tip of each of the first aggregate and the second aggregate respectively The pivotally supported plurality includes a third bone material provided annularly, wherein the aggregate is the inner shaft by normal time when not operated to slide the inner shaft distally relative to the outer tube And the inner shaft is slid to the rear end side with respect to the outer tube so that the aggregate is separated so as to be separated outward from the inner shaft. In this state, a gap is formed between the inner shaft and the balloon to ensure blood flow in the longitudinal direction in the aggregate. Therefore, a sufficient blood flow can be secured even when the balloon is expanded. Therefore, balloon dilation for closely fixing the stent graft to the inner wall of the blood vessel during stent graft interpolation can be performed without fear of lower limb ischemia. Furthermore, as a new treatment for dissociative aortic aneurysms, this balloon can be directly inflated at the aneurysm dissection to allow the dissection to be pressure-fixed by the balloon while securing blood flow, resulting in thrombus formation in the dissociation cavity It is also possible to treat dilated aortic aneurysms. That is, treatment can be performed without placing a foreign substance such as a stent in a blood vessel. Further, by inflating the balloon provided in the frame structure, the pressure can be applied to the lumen of the blood vessel with a uniform expansion force, and the treatment can be accelerated. In addition to that, it is possible to smoothly perform the ups and downs of the frame structure by the cooperation of the aggregate by the pivoting.

  According to the second aspect of the present invention, the first aggregate and the second aggregate have substantially the same length, and the third aggregate is longer than the first aggregate and the second aggregate. Since the third aggregate is parallel to the inner shaft in the upright state at the time of operation, the above-mentioned undulation operation can be performed in parallel with the inner shaft, and the undulation operation before expansion or contraction of the balloon becomes smooth. In addition to the above, inflation or deflation of the balloon can be performed stably.

According to the third aspect of the present invention, since the balloon is a toroidal balloon, it is easy to manufacture and at the same time, the task of attaching it to the frame structure can be performed easily.

According to the invention set forth in claim 4 , the balloon is provided with a base sheet on its inner peripheral surface, and the base sheet is adhered to the adhesive attached to the third aggregate of the framework, so that the balloon is Installation of the balloon is further facilitated, and replacement of the balloon is also facilitated if the balloon is damaged.

According to the invention as set forth in claim 5 , the adhesive body has a main body portion having a length substantially equal to the length of the third aggregate and having a semicircular cross section, and the length of the main body portion An axial hole is formed in the interior substantially in the longitudinal direction, and the third aggregate is inserted into the axial hole, and the base sheet of the balloon is adhered to the flat outer surface, so that the balloon is formed. Since the adhesion to the base sheet is a flat work rather than a spherical surface, installation becomes easy.

It is a front view which partially abbreviate | omits the length of an outer tube, and shows the state which the framework | assembly structure expanded completely and stood up in the balloon catheter which concerns on one embodiment of this invention. It is a front view which partially abbreviate | omits the length of an outer tube, and the state which the framework | assembly structure shrink | contracted completely in the balloon catheter same as the above is collapsed. FIG. 3 is an enlarged left side view taken along line III-III of FIG. 2; The frame structure body of the same above is fully expanded and stands up, and the balloon is in an expanded state, (A) is a longitudinal sectional front view thereof, and (B) is an enlarged longitudinal sectional front view of a B part. The frame structure body of the same above is fully expanded and stands up, and the balloon is in an expanded state, in which (A) is a longitudinal side view thereof and (B) is an enlarged longitudinal side view of a B part. It is operation | movement explanatory drawing which shows the example which the arterial dissection part (affected part) produced in the thoracic aorta. It is a principal part enlarged view which shows the state which has inserted the guide wire in the blood vessel through the lumen | bore of a puncture needle. It is a principal part enlarged view which shows the state which has inserted the dilator into a blood vessel along a guide wire, and has expanded the puncture site | part. It is a principal part enlarged view which shows the state which has inserted the sheath with a dilator after removing a dilator. It is a principal part enlarged view which shows the state at the time of the endovascular insertion of a sheath with a dilator. It is a principal part enlarged view which shows the state which left only the sheath and removed only the dilator. It is a principal part enlarged view which shows the state which has inserted the balloon catheter into the blood vessel along the guide wire through the lumen | bore of a sheath. It is a drawing corresponding to FIG. 6 which shows the state which the balloon of the balloon catheter reached to the arterial dissociation part. It is an enlarged view of an artery dissection part same as the above. It is the principal part enlarged view which shows the state which semi-expanded and stood up in the frame structure body same as the above. It is the principal part enlarged view which will be in the state which the frame structure same as the above expand | swelled completely, stood up, and the state which the balloon expanded.

  Hereinafter, a balloon catheter according to an embodiment of the present invention will be described with reference to the drawings.

  In FIGS. 1 to 3, reference numeral 1 denotes a balloon catheter. The balloon catheter 1 is entirely made of a material suitable for a living body such as silicone rubber, has a lumen whose front and rear ends are open, and an outer tube 2 of a predetermined length. And a catheter of a coaxial type main tube (double tube structure) configured of an inner shaft 3 slidably housed in the longitudinal direction with a tip portion protruding from the front end opening of the outer tube in the inner lumen of the outer tube It has become. The material of the outer tube 2 may be thermoplastic resin such as PP, PE, PU, nylon or the like in addition to the above silicone rubber, and various materials can be used as long as they are used in a medical device.

  At the tip end of the balloon catheter 1 in the insertion direction of the inner shaft 3, a framework 5 capable of opening and closing like an umbrella is provided between the tip of the inner shaft 3 and the tip of the outer tube 2. The frame structure 5 is made of a metal suitable for medical use, such as stainless steel, nickel, titanium alloy, shape memory alloy, etc., and a plurality of circumferentially arranged predetermined intervals facing the length direction of the inner shaft 3 It has aggregate 5-1, 5-2, 5-3, 5-4. Each of the aggregates 5-1, 5-2, 5, 3, 5-4 is connected by arranging a plurality of pivots in the longitudinal direction of the inner shaft 3, the aggregates 5-1 a, 5-1 b, 5-5 1c, aggregate 5-2a, 5-2b, 5-2c, aggregate 5-3a, 5-3b, 5-3c, aggregate 5-4a, 5-4b, 5-4c as a whole It can be undulated radially about the inner shaft 3.

  That is, as shown in FIG. 4 with the front view thereof and FIG. 5 showing the side view in an enlarged manner, respectively, the framework structure 5 is respectively provided to the aggregate binding portion 3a provided with a rounded tip at the tip end of the inner shaft 3. A plurality of (four in the drawing) pivotably supported by pivot pins at one end, and first aggregates 5-1a, 5-2a, 5-3a, 5-4a annularly provided at predetermined intervals, One end of each of the aggregate binding portions 3b provided at the tip of the outer tube 2 is pivotally supported by a pivot pin to provide the same number of second aggregates 5-1b, 5-2b, 5-3b, annularly provided. 5-4b, both ends of each of the first aggregate and the second aggregate are pivotally supported by pivot pins at the other ends of the first aggregate and the third aggregate 5-1c, 5-2c, respectively, provided in the same number in an annular shape. 5-3c, and 5-4c. The tip of the aggregate binding portion 3a is rounded to prevent damage to the living body when the balloon catheter 1 is inserted.

  The aggregates 5-1, 5-2, 5-3 and 5-4 are made of the same thin rod-like material, and constitute a link mechanism so as to surround the inner shaft 3 as illustrated. The first aggregates 5-1a, 5-2a, 5-3a, and 5-4a are respectively equal in length, and the second aggregates 5-1b, 5-2b, 5-3b, and 5-4b are also substantially the same as the first aggregate. The same lengths and equal lengths, and the third aggregates 5-1c, 5-2c, 5-3c, and 5-4c are also equal in length and longer than the first and second aggregates, respectively. As is apparent from FIGS. 1 and 4 (A) and 5 (A), the third aggregates 5-1c, 5-2c, 5-3c, and 5-4c are completely expanded and stood upright, respectively. It is substantially parallel to the inner shaft 3 and equally spaced in the circumferential direction. The aggregate 5-1, 5, 2, 5, 3, 5-4 is constructed by sliding the inner shaft 3 to the rear end side while fixing the outer tube 2 while the framework 5 of the above structure is fixed. By expanding and standing up and performing the reverse operation from this standing state, it contracts and returns to the fallen state.

  When the inner frame 3 is slid to the distal end side with respect to the outer tube 2 as described above in the normal state in which the frame structure 5 does not operate, the aggregate approaches the inner shaft 3 and falls as shown in FIG. Then, the outer diameter is reduced to a size close to that of the outer tube 2, and the state is extended and collapsed, resulting in a folded state. On the other hand, when the inner shaft 3 is slid to the rear end side with respect to the outer tube 2 from this folded state, the aggregate gradually separates from the inner shaft 3 and expands, and although not shown, it is semi-expanded. It will be in the state of Then, when it is further slid to the rear end side, as shown in FIG. 1, the aggregate is fully expanded and stands up. In this fully expanded standing state, a gap can be created between the inner shaft 3 and each of the aggregates 5-1, 5, 2, 5, 5, 5-4 to ensure blood flow in the longitudinal direction in the aggregates. become. As the material of the framework 5, in addition to the above-mentioned metals such as stainless steel, it is possible to use various materials such as nitinol and carbon fibers which have a certain degree of rigidity and which are used in medical devices.

  On the outer surface of the framework 5 is provided a toroidal balloon 6 as shown in FIGS. The balloon 6 is a so-called foldable balloon whose foldable shape can be predicted, and a sheet 7 as a base is attached to almost the entire inner peripheral surface. The base sheet 7 is adhered to the adhesive 8 inserted into the third aggregates 5-1c, 5-2c, 5-3c, and 5-4c of the framework 5 to construct the balloon 6 as a framework. The attached balloon 6 is attached to the outer surface of the umbrella 5. When the frame structure 5 is contracted, the attached balloon 6 has a folding ridge in one circumferential direction as shown in FIG. It folds in the same way as folding a bag. Then, after being expanded, when it is contracted, it returns to its original folded state again.

  As a material of the base sheet 7, any fibrous material used in medical devices such as cotton, polyester, nylon, etc. can be used. Here, a mesh in which fibers are woven is used, and further, the mesh coated with silicone rubber is used.

  The bonded body 8 has a length equal to that of the third aggregates 5-1c, 5-2c, 5-3c, 5-4c, and the cross section is a circle whose inside is clear from FIG. 5 (B). It has an arc-shaped body portion 9 formed in a semicircular shape whose outer side is flat. An axial hole is formed in the interior substantially at the center of the main body 9 in the longitudinal direction, and a third aggregate 5-1c, 5-2c, 5-3c, 5-4c is inserted into the axial hole. It has become. The base sheet 7 of the balloon 6 is adhered to the flat outer surface of the main body 9. The flat outer surface of the main body portion 9 is intended to increase the bonding area as much as possible. The bonded body 8 is made of, for example, a material such as silicone rubber.

  Before inflating the balloon 6, the framework 5 is raised to expand the balloon 6 into a donut shape. In the erected state in which the aggregates 5-1, 5-2, 5, 3, 5-4 are fully expanded, the balloon 6 is in a state in which the base sheet 7 is expanded by the aggregate. A gap (part E in FIG. 4) is formed to secure blood flow. Thereafter, the balloon 6 is expanded to expand or crimp the affected area. As the material of the balloon 6, any material used in medical devices, such as thermoplastic resin such as PP, PE, PU, thermoplastic elastomer, silicone rubber, etc. can be used.

  It is as follows when the dimension of each part of the above-mentioned balloon catheter 1 is described for reference. As shown in FIG. 1, the balloon catheter 1 has a total length L1 of 1400 mm (effective length 1200 mm) and an outer diameter D1 of 8 mm. Further, as shown in FIG. 4, the skeleton structure 5 has a total length L2 of 90 mm and an expanded diameter D2 of 30 mm. The balloon 6 has a total length L3 of 50 mm and an expanded diameter D3 of 40 mm (when the expanded diameter D2 of the skeletal structure 5 is 30 mm).

  In FIGS. 1 and 2, reference numeral 11 denotes a stopcock provided at the rear end of the outer tube 2. By opening and closing the stopcock, physiological saline is formed into a balloon lumen, and the water is passed through a water supply pipe 12 provided in the outer tube 2. It will be supplied to 6. At least the distal end portion of the water supply tube 12 is flexible and protrudes from the distal end opening of the outer tube 2, and the distal end opening communicates with the inside of the balloon 6. Reference numeral 13 denotes a tightening screw for fixing the inner shaft 3 which slides in the outer tube 2. Reference numeral 15 denotes an operation knob for the inner shaft 3 provided at the rear end of the inner shaft 3. The operation knob 15 is provided with an insertion opening 16 for inserting a guide wire. The tightening screw 13 enables the inner shaft 3 to slide when loosened, but disables the shaft from sliding when it is tightened and fixed.

  The operation of the balloon catheter 1 will be described below.

  As shown in FIG. 6, for example, an arterial dissection (affected part) G as an aortic aneurysm is formed in the thoracic aorta, and when treating this part, first puncture the puncture needle H into the femoral artery of the thigh which is a catheter insertion site. Do. Then, the guide wire I is inserted into the blood vessel through the lumen of the puncture needle H (FIG. 7). After insertion of the guide wire I, the puncture needle H is removed while leaving the guide wire in the blood vessel, and then the dilator J is inserted into the blood vessel along the inserted guide wire I to expand the puncture site ( Figure 8).

  After the puncture site is expanded, the dilator J is removed leaving the guide wire I. Thereafter, a sheath K (a cylinder for containing a catheter) with a dilator is inserted (FIG. 9). After the insertion of the sheath K with the dilator is completed (FIG. 10), the sheath K is left and only the dilator is removed. FIG. 11 shows a state in which only the sheath K is indwelled. Next, the balloon catheter 1 is inserted into the blood vessel from the distal end side through the lumen of the sheath K and along the guide wire I (FIG. 12). Then, when the middle part of the frame structure 5 in the folded state is at a position facing the affected part G, the insertion is completed (FIGS. 13 and 14).

  Next, the control knob 15 is held and the inner shaft 3 is slid so as to be pulled out to the rear end side of the outer tube 2. As a result, the aggregates 5-1, 5, 2, 5, 5, 5-4 of the framework 5 expand radially outward with the pivot pin as a fulcrum so that the balloon 6 approaches the blood vessel wall. (FIG. 15). This state is a semi-expanded state. After that, when it is further pulled out, the aggregates 5-1, 5-2, 5 and 5-5 expand radially further with the pivot pin as a fulcrum, and the balloon 6 has the base sheet 7 expanded by the aggregate. It will be in the state. This state is a state of full expansion, that is, the state of FIG. 1 before the balloon 6 is positively expanded, and the middle part of the bone material comes in contact with the blood vessel wall and comes in contact with the affected part. As described above, since the balloon 6 is still in this state before being inflated, it is in a state of being spread over the aggregate of the fully expanded framework 5 in a sheet form.

  Next, the stopcock 11 is opened from a physiological saline solution supply unit (not shown) connected to the stopcock 11 and physiological saline is poured in, and when the balloon 6 is inflated, the balloon 6 gradually squeezes the affected area G and the blood vessel wall is outside In addition, the affected area G is also pushed outward, and the part that had been dissociated up to that point is also in the original stuck state (FIG. 16). Meanwhile, the balloon 6 remains expanded because the stopcock 11 is closed, but the aggregates 5-1, 5, 2, 5, 3, 5-4 of the framework 5 expand and stand up. A gap E is formed inside the balloon 6, and this gap secures the blood flow in the inside. Arrows in FIG. 16 indicate the flow of the blood flow. As described above, the use of the framework 5 makes it possible to form a gap for securing the blood flow inside the balloon 6, so that the hollow inside the balloon can not be held as in the prior art, and the blood flow is secured. There is nothing that you can not do.

  That is, even if a normal balloon is formed into a donut shape, there is a problem that when the balloon is expanded, the shape changes due to the internal pressure of the balloon and the cavity inside the balloon can not be held. By means of the structure 5, a gap can be formed inside the balloon 6 to hold the cavity. Therefore, the blood flow can be stably secured. Therefore, in the treatment of dissociative aortic aneurysm, the dissociative part can be directly pressure-fixed by the balloon 6 while the blood flow is secured, and the dissociative part can be treated. Moreover, treatment can be performed without indwelling another material such as a stent in a blood vessel.

  When the treatment for the affected area G is completed, the stopcock 11 is opened and the saline is withdrawn from the balloon 6. As a result, the balloon 6 is contracted and expanded. After that, the inner shaft 3 is slid to the front end side of the outer tube 2. As a result, the aggregates 5-1, 5-2, 5, 5, 5-4 of the framework 5 are recessed with the pivot pin as a fulcrum and approach the inner shaft 3 to lie down, and the outer diameter becomes the outer tube 2. The diameter is reduced to a close size, and it is in an expanded and collapsed folded state (FIG. 1). Furthermore, the balloon 6 is folded in the original state shown in FIG. When the framework 5 is in the folded state as described above, the balloon catheter 1 is pulled out of the blood vessel by performing the reverse operation of the insertion operation. Finally, the balloon catheter 1 is pulled out of the femoral artery in the thigh.

  In this embodiment, when the normal balloon is expanded in the blood vessel etc. as described above, the entire lumen is occluded, but in this toroidal balloon 6, the skeleton of the balloon catheter 1 is obtained. A clearance can be generated between the expanded aggregate of the framework 5 and the balloon 6 by the numeral 5, and a blood flow or the like can be secured by using the clearance. Then, by inflating the balloon 6 provided in the skeletal structure 5, it is possible to make a pressure contact with the blood vessel lumen with a uniform expansion force. Therefore, the treatment can be accelerated.

  Further, in this embodiment, in the framed structure 5, each of the aggregates 5-1, 5-2, 5 and 3 and 5 is composed of the first to third aggregates. Therefore, the coordination of the aggregate by the pivot supports smooth movement of the frame structure. Moreover, the first aggregates 5-1a, 5-2a, 5-3a, 5-4a and the second aggregates 5-1b, 5-2b, 5-3b, 5-4b have substantially equal lengths, respectively. The third aggregate 5-1c, 5-2c, 5-3c, and 5-4c are formed longer in length than the first aggregate and the second aggregate, and the third aggregate is in the state of standing up at the time of operation Since it becomes parallel to the inner shaft 3, the above-mentioned up and down movement can be performed in parallel with the inner shaft, and the up and down movement before expansion or contraction of the balloon becomes smooth. Furthermore, after standing up, expansion or contraction of the balloon 6 can be performed stably.

  In addition, since the balloon 6 is also formed of a toroidal balloon, its manufacture is easy, and the attachment work to the framework 5 can be easily performed. And the base sheet 7 is provided in the inner peripheral surface of the balloon 5, and this base sheet is attached to the 3rd aggregate 5-1 c 5- 2 c 5- 3 c 5- 4 c of the framework 5 Since the adhesive body 8 is adhered, the attachment of the balloon 6 is further facilitated, and the replacement of the balloon 6 is also facilitated if the balloon 6 is damaged.

  Furthermore, the bonded body 8 has a length equal to that of the third aggregate 5-1 c 5-2 c 5-3 c 5-4 c and the main body portion 9 having a semicircular cross section. An axial hole is formed in the inside substantially at the center in the longitudinal direction of the main body, and the third aggregate is inserted into the axial hole, and the base of the balloon 6 is formed on the flat outer surface. Since the sheet 7 is adhered, the adhesion of the balloon to the base sheet is not a spherical surface but is a flat work, so that the attachment is easy.

  It is needless to say that the above-described embodiment is merely a preferable example, and the design and the like of the details can be arbitrarily changed and corrected within the scope of the claims of the present invention. For example, the frame structure 5 is made of each of the aggregates 5-1, 5-2, 5, 3 and 5-4, and each of the aggregates is made of the first to third aggregates. It is not necessary to necessarily have such a structure. In addition, although the aggregate is in the form of a round bar in this example, this is merely an example and may have another shape.

  Further, in addition to the above, in this embodiment, an aortic aneurysm has been exemplified as the affected part, but of course it may be applied to other blood vessels.

REFERENCE SIGNS LIST 1 balloon catheter 2 outer tube 3 inner shaft 5 framed structure 5-1, 5, 2, 5, 5-4 aggregate 6 balloon 7 base sheet 8 bonded body 9 main body 11 stopcock 12 water pipe 13 tightening screw 15 Operation knob 16 Insertion port G Arterial dissection part (diseased part)
H puncture needle I guide wire J dilator K sheath

Claims (5)

An outer tube having a predetermined length at which the front and rear ends are open, an inner shaft in which the tip end portion is protruded from the front end opening of the outer tube and slidably accommodated in the long axis direction What is claimed is: 1. A balloon catheter comprising: a frame structure provided between the tip of the outer tube and the outer tube; and a balloon attached to the outer surface of the frame structure,
The frame structure has a plurality of first members provided at predetermined intervals in an annular manner by pivotally supporting one end on the tip of the inner shaft, and one end on the tip of the outer tube. A second aggregate provided in the same number and in an annular shape, and a plurality of third aggregates provided in an annular shape by pivotally supporting both ends on the other end of each of the first aggregate and the second aggregate, Have
At normal times, the inner shaft is slid to the tip side with respect to the outer tube at the time of operation, whereby the aggregate is folded and folded so as to approach the inner shaft. By sliding the inner shaft to the rear end side, the aggregate is erected so as to be separated outward from the inner shaft, and a gap is created between the inner shaft and the balloon, and the longitudinal direction in the aggregate is obtained. A balloon catheter characterized in that it is possible to secure blood flow. The balloon catheter according to claim 1 , wherein the first aggregate and the second aggregate have substantially equal lengths, and the third aggregate is formed to be longer than the first aggregate and the second aggregate. A balloon catheter characterized in that the third aggregate is in parallel with the inner shaft in an upright state at the time of operation. The balloon catheter according to claim 1 or 2 , wherein the balloon is a toroidal balloon. 4. The balloon catheter according to claim 3 , wherein the balloon is provided with a base sheet on its inner circumferential surface, and the base sheet is adhered to an adhesive attached to the third aggregate of the framework. And a balloon catheter. The balloon catheter according to claim 4 , wherein the adhesive body has a main body portion having a length equal to that of the third bone material and having a semicircular cross section, and the length of the main body portion An axial hole is formed in the interior substantially at the center of the direction, and a third aggregate is inserted into the axial hole, and a base sheet of the balloon is adhered to the flat outer surface. Balloon catheter.