JPWO2007080843A1 - Catheter system - Google Patents

Abstract

A catheter system having a balloon introduced percutaneously transluminally into the body and occluding the lumen within the body may require a detachable adapter to expand and contract the balloon. The adapter needs to be detached while maintaining the expanded state of the balloon, and the conventional adapter has a problem that the operation is complicated and the occlusion time becomes long. In the present invention, a catheter system comprising a balloon, a tubular body having an inflation lumen, a catheter body having a fluid seal portion, and an adapter connected to the catheter body, the seal portion of the catheter body being inserted into the adapter and inserted. The catheter system is characterized in that the seal is opened by the operation, and the seal is closed by the operation of removing the seal portion from the adapter, and the above-mentioned problems have been solved because the procedure by the operation is reduced.

Description

  The present invention relates to a catheter system having a balloon that is introduced into a body percutaneously and transluminally and closes a lumen in the body or removes a thrombus or a foreign substance.

    Conventionally, when stenosis or occlusion occurs in a blood vessel such as a blood vessel, angioplasty (PTA: Percutaneous Transluminal Angioplasty, which is performed to improve the blood flow on the peripheral side of the blood vessel by expanding the stenosis or occlusion site of the blood vessel. PTCA (Percutaneous Transluminal Coronary Angioplasty, etc.) has a large number of surgical cases in many medical institutions, and it has become common for surgery in this type of case. Furthermore, stents and the like for maintaining the state of the expanded stenosis have been used in recent years.

  Balloon catheters used for PTA and PTCA are mainly used as a set of a guide catheter and a guide wire in order to expand a stenosis site or a blockage site of a blood vessel. In this angioplasty using a balloon catheter, a guide catheter is first inserted from the femoral artery, the tip is positioned at the entrance of the coronary artery through the aorta, and then the guide wire penetrating the balloon catheter is connected to the stenosis site of the blood vessel. Advancing beyond the occlusion site, then advancing the balloon catheter along the guide wire, inflating the balloon with the balloon positioned at the stenosis site or occlusion site, and expanding the stenosis site or occlusion site; and The balloon is deflated and removed from the body. This balloon catheter is not limited to treatment of a stenosis or occlusion site of a blood vessel, but is useful for many medical applications including insertion into a blood vessel and insertion into various body cavities and tubular tissues.

  However, when the occlusion in the blood vessel is caused by a thrombus, if the occlusion site is expanded with a balloon catheter, the thrombus may be released from the inner wall of the blood vessel and occlude the downstream peripheral blood vessel. In addition, when expanding a stenotic site in a blood vessel, when the lesion contains many rod-shaped plaques, the balloon-caused expansion causes the rod-shaped plaque (atheroma) to scatter from the lesion, causing peripheral blood vessels to It may be blocked. If an embolic material such as a thrombus or atheroma that occludes a peripheral blood vessel occurs in this way, even if the obstruction or stenosis is expanded, blood flow does not flow to the periphery, so slow flow or no flow Fall into the situation.

  In such a situation, it is common to look at the coronary artery or the like until the blood flow is recovered, but it may take a considerable amount of time to recover. Depending on the situation, vasodilators may be administered to restore blood flow, or drugs such as thrombolytic agents may be locally administered to dissolve obstructions. Sometimes it does n’t. If peripheral occlusion is severe and hemodynamics are poor, auxiliary means such as IABP are also used.

  Also, especially in the case of vascular occlusion or stenosis in the carotid artery or cerebral artery, if peripheral occlusion occurs due to angioplasty with a balloon catheter or stent, blood flow to the brain stops and the occluded site The peripheral brain cells of the brain become ischemic. If the ischemic state of the brain lasts for a long time, brain cells may die, and a very dangerous state of damage to the brain function may occur, so in the case of angioplasty of the cerebral artery or carotid artery, other blood vessels In comparison, sufficient care is required so that obstruction does not occur particularly in peripheral blood vessels.

  In order to prevent the peripheral blood vessels from becoming occluded in this way, it is attempted to temporarily occlude the peripheral blood vessels of the blood vessels that become lesions and perform angioplasty of the lesioned portion in that state It has been. Various such devices have been proposed, and examples include a filter device and a temporary occlusion balloon catheter. However, several problems arise when using these devices. For example, when a filter device is used, when the filter portion is inserted to the periphery of the lesion and the filter is expanded, the filter may be excessively expanded to damage the blood vessel. On the other hand, if the expansion is insufficient, the blood vessel is not protected, but there is no way to confirm it. On the other hand, in the case of a balloon catheter for temporary occlusion, since the occlusion state can be confirmed by contrast enhancement, it may be actively used for lesions that require reliable occlusion. A problem with the temporary occlusion balloon catheter is that blood flow does not flow to the periphery during occlusion for protection, and therefore the periphery is likely to be temporarily ischemic, which may cause adverse effects. Especially for temporary occlusion balloon catheters, it is necessary to expand and expand the balloon at the periphery of the lesion and to insert and remove other catheters along the shaft of the temporary occlusion balloon catheter while maintaining the expansion. Since the operation is complicated compared to the filter device, this problem is more likely to occur. Therefore, it is very important to perform balloon expansion and contraction operations as soon as possible, that is, connectivity to adapters for introducing and discharging fluids necessary for the expansion and contraction operations. Patent Document 1 discloses a catheter that blocks a blood flow using a single inflation balloon and an adapter for inflating or deflating the inflation balloon. Only the adapter in the prior art is described as being detachable from the proximal end portion of the catheter, and the adapter is not equipped with a function for operating the extension member (the working part in the present invention) in the prior art. . In such a case, it seems that the extension member is directly operated by the hand of the operator, but it is considerably difficult to directly operate the thin shaft by hand. The fitting of the extension member and the catheter body and fluid sealing are performed by threading or friction. However, in the case of threading, it is very difficult to insert a thin extension member with a screw into a thin shaft in an actual clinical setting. There is a problem that it is difficult to perform and a smooth procedure cannot be performed. Also, in the case of fitting by friction, there is a problem that in order to demonstrate the ability of fluid seals, there is a problem that it must be manufactured with very close tolerances, and at the same time, friction resistance is required to demonstrate the ability of fluid seals. There is a problem that the thin extension member and the catheter shaft are broken when the extension member is operated.

  Patent Document 2 discloses a catheter having a low profile valve and an inflation adapter for operating the valve. The adapter in this prior art consists of a housing having a first part and a second part, the catheter is fixed in the housing, the first part and the second part are combined, and the housing is fixed by a lock clip. There is a problem that the catheter cannot be easily fixed by one operation, and a smooth procedure cannot be performed in an actual clinical site.

In addition, for a catheter system having a balloon for removing a thrombus or a foreign substance, a removable adapter is too complicated to be applied, and the catheter shaft cannot be used as a guide wire for guiding another catheter. was there.
JP 2002-126093 A Special Table 2000-551082

  In view of these circumstances, an object of the present invention is to provide a catheter system that can be operated easily and quickly.

  Means for solving the above problems include the structure of a catheter system having a new balloon, the selected material arrangement, and the connectivity between the catheter body and the adapter for balloon expansion, fluid introduction required for deflation, and drainage. An object of the present invention is to provide a catheter system in which the procedure required for operation is reduced by improving (simplification of operation). That is, a balloon, a tubular body having an inflation lumen through which a fluid for expanding or contracting the balloon can move, a catheter body having a fluid seal portion that seals the fluid at a proximal portion of the tubular body, and a catheter body The catheter system is composed of an adapter connected to the adapter, and the seal is opened by inserting and inserting the seal portion of the catheter body into the adapter, and the seal is closed by removing the seal portion from the adapter. Since the catheter system is a feature, the problem of the present invention can be solved because the catheter body can be connected to and detached from the adapter and the catheter body can be opened and closed with a minimum operation procedure.

  Conventional catheters having balloons that temporarily occlude lumens in the body have poor connectivity with adapters for introducing and discharging fluids necessary for balloon expansion and contraction operations, and are complicated to operate. The present invention solves these problems because the procedure by operation is reduced.

  The best embodiment of the catheter according to the present invention will be described below. The present invention includes a balloon, a tubular body having an inflation lumen through which fluid for expanding or contracting the balloon can be moved, and a catheter body having a fluid seal portion that seals the fluid to a proximal portion of the tubular body; A catheter system comprising an adapter connected to the catheter body, wherein the seal is opened by inserting and inserting the seal portion of the catheter body into the adapter, and the seal is closed by removing the seal portion from the adapter. This is a catheter system.

  FIG. 1 is an overall schematic diagram of a catheter body for occluding a body lumen according to the present invention. A balloon 101, a main shaft 102 which is a tubular body having an inflation lumen capable of moving a fluid for expanding or contracting the balloon communicating from the proximal end of the catheter to the inside of the balloon, and a fluid seal portion for sealing the fluid There is a proximal portion 103. The material of the balloon is not particularly limited. Polyurethane, silicone rubber, polyethylene, polyamide, polyurethane, polyamide elastomer, polyester elastomer, latex rubber, SEBS (styrene-ethylenebutylene-styrene block polymer), SIBS (styrene-isobutylene) A relatively flexible material such as a styrene block polymer can be preferably used. The material of the main shaft is not particularly limited, and polyimide, stainless steel, Ni-Ti, Ni-Ti-Fe, Ni-Ti-Cu, Ni-Ti-Cr, Ni-Ti-V, Ni-Ti- Co, Ni-Ti-Nb, Ni-Ti-Pd, Ni-Ti-Cu-Cr, Fe-Mn-Si, Co-Cr, etc. are used alone or in combination, and the shaft is considered in consideration of the strength balance of the catheter. Can be used with optimal material placement in the direction.

  FIG. 2 is a schematic view showing a state where the seal portion of the catheter body is inserted into the adapter 204 and inserted. A syringe 206 for expanding or deflating the balloon is connected to the adapter via a connection circuit 205 between the adapter and the syringe. Although FIG. 2 shows an example in which an adapter and a syringe for expanding or deflating a balloon are connected by a circuit, a device for controlling a fluid for expanding or deflating a balloon may be incorporated in the adapter. FIG. 3 is a schematic view showing an example of a seal portion formed in the proximal portion 303 of the tubular body (main shaft 302) of the catheter body according to the present invention and not inserted into the adapter. When not inserted into the adapter, the taper portion of the valve body 307 that substantially seals the fluid is pressed by the spring 310 and brought into close contact with the seal surface 308 formed in a tapered shape on the catheter body side, thereby sealing. Has been achieved. In this state, the valve body 307 enters the catheter relative to the proximal end 309 of the catheter body. However, the valve body is less susceptible to contact with the other, and there is less possibility of unintentional opening and closing. It may be preferable. The adhesion between the valve body and the seal surface is an important factor for the reliability of the seal, and it is preferable that the contact surfaces of both be mirror-finished, or at least one surface should be provided with a material more flexible than the other. It is preferable from the viewpoint of dimensional control and durability that the stainless steel valve body taper portion is coated with urethane resin, or the valve body is made of stainless steel and the polyimide resin is thinly arranged on the sealing surface of the catheter body.

  FIG. 4 is a schematic view showing an example of the adapter of the present invention. The adapter has an insertion portion 412 to be inserted by inserting the seal portion of the catheter body, and the insertion portion is preferably such that the shaft of the seal portion to be inserted is always inserted at a fixed position with respect to the adapter. More preferably, the cross-sectional shape of the portion is similar to the cross-sectional shape of the catheter seal portion. For example, when the cross-sectional shape of the seal part of the catheter is circular, the cross-sectional shape of the insertion part is also circular, which makes it easy to insert the shaft of the seal part at a constant position with respect to the adapter and opens and closes the seal. It is preferable because the operation is more stable. Moreover, in order to make it easy to insert the seal portion into the adapter, it is preferable that the adapter outermost surface portion of the insertion portion has a tapered portion 425 opened outward in a tapered shape.

  In order to smoothly and reliably expand and contract the balloon, it is preferable that when the catheter body is inserted and inserted into the adapter, the air-tightness is maintained between the inflation lumen of the catheter and the fluid supply part of the adapter. Therefore, it is preferable to arrange the airtight member 413 in the insertion portion of the adapter. Regarding the airtight member, it is preferable that the material has rubber elasticity because it is easy to maintain airtightness and also exhibits the retainability of the catheter body, and covers the outer surface of the catheter body without gap when the seal part of the catheter is inserted. The shape is preferred. In addition, when the catheter body is inserted and inserted into the adapter, it is preferable that the adapter has a holding mechanism for fixing the relative position of the catheter body and the adapter because the operation is more stable, but the holding mechanism is complicated. For example, as shown in FIG. 4, the catheter holding portion 414 protrudes from the spring member 415 and the member 416 connected to both to the inner surface of the insertion portion. In the case of the structure, if the hand is taken to insert the catheter body into the adapter and at the same time the member 416 is pressed so as to compress the spring, the catheter holding portion 414 can be retracted from the inner surface of the insertion portion. If the member 416 is released after the catheter body is placed, the catheter body is inserted into the adapter. As shown in FIG. 5 showing only the inserted state, preferably from that it can be held without the catheter body extra work in the catheter holding portion 514. For a catheter body having a seal portion with the valve body 307 as illustrated in FIG. 3 entering the interior of the catheter relative to the proximal end 309 of the catheter body, as shown in FIG. With the protruding structure 417 attached to the adapter insertion portion, the valve body is attached to the adapter insertion portion in accordance with the operation of inserting and inserting the seal portion of the catheter body into the adapter. It is preferable to use an adapter of a type in which the seal is opened by being displaced by.

  FIG. 5 shows a state in which the catheter main body is inserted and inserted into the adapter, and the projecting structure 517 places the valve body 507 in the catheter relative to the proximal end 509 of the catheter main body. The protrusion-like structure is not particularly limited as long as the balloon expansion / contraction fluid can be taken in and out of the catheter in this state. However, the protrusion-like structure is a hollow cylindrical structure that expands or contracts the balloon inside. It is preferable to have a structure that allows a fluid to pass through to ensure a sufficient fluid flow rate. As a material, since it must be brought into contact with the valve body and moved, a certain degree of strength is required, and a metal material is preferable, and stainless steel is preferable from the viewpoint of workability. Further, it is preferable to have a portion 518 that is cut obliquely at the tip of the cylindrical structure because it is easy to ensure the flow rate of the fluid, and in addition, it is easy to insert into the proximal end of the catheter. Providing a hole 519 for allowing fluid to pass through on the side of the body is preferable because it is easier to secure the flow rate of the fluid.

  FIG. 6 is a schematic diagram showing another example of the seal portion formed in the proximal portion 603 of the tubular body (main shaft 602) of the present invention, which is not inserted into the adapter. When not inserted into the adapter, the taper portion of the valve body 607 that substantially seals the fluid is pressed by the spring 610 and brought into close contact with the sealing surface 608 formed in a tapered shape on the catheter body side, thereby sealing. Has been achieved. In this state, the protruding portion 621 of the valve body 607 protrudes to the outside of the catheter relative to the proximal end 609 of the catheter body. However, when urgent balloon deflation is necessary, the valve body is manually moved. Since there is an advantage that the valve can be operated and the open / closed state of the valve can always be visually confirmed, the valve body may be more preferable than the example of FIG. For this type of catheter body, for example, an adapter as shown in FIG. 7 is preferably applied. In the adapter of FIG. 7, it is arranged in accordance with the operation of inserting the seal portion of the catheter body into the adapter and inserting it by the pressing structure 722 which is disposed at the insertion portion of the adapter and pushes the portion protruding from the catheter of the valve body. When the valve body is displaced by the pressing structure, the seal is opened. FIG. 8 shows a state where the catheter body is inserted and inserted into the adapter. The pressing structure 822 pushes the protruding portion 821 of the valve body to the proximal end 809 of the catheter body. Although the material and structure of the pressing structure disposed in the insertion portion of the adapter are not particularly defined, a mesh-like structure capable of passing a fluid for expanding or contracting the balloon has fluid permeability. Is preferable because the flow rate can be secured. Further, it is preferable that the mesh is made of metal since it has sufficient strength against pressing. In addition, the pressing structure disposed in the insertion portion of the adapter is a porous structure that allows a fluid for expanding or contracting the balloon to pass therethrough. From the viewpoint of strength, a sintered porous body of metal or ceramic is preferable from the viewpoint of strength.

  In addition, since the present invention can provide a detachable adapter that is easy to operate, it is also suitable for a balloon catheter system for removing thrombus and foreign matter of the type that uses the catheter shaft as a guide wire for guiding other catheters. Used for.

  Hereinafter, more specific examples and comparative examples according to the present invention will be described in detail.

Example 1
The main shaft is a cylindrical proximal shaft with a circular outer diameter of 0.33 mm (made of stainless steel coated with Teflon (registered trademark)) and a cylindrical distal shaft with a circular outer diameter of 0.33 mm (surface Teflon ( (Registered trademark) coated NiTi steel). A balloon made of polyurethane, an inner surface of the guide wire lumen made of polyethylene, and a tip shaft made of polyamide elastomer as a main body were assembled and connected to the main shaft. In addition, a cylindrical stainless steel tube having a circular cross-section with an outer diameter of 0.35 mm, a component obtained by drawing the proximal end of the catheter body to an outer diameter of 0.27 mm (the inner diameter of the portion is 0.21 mm), and a maximum A seal portion is formed as shown in FIG. 3 by combining a valve body having a taper with a diameter of 0.25 mm to a minimum diameter of 0.19 mm, and a taper surface coated with urethane resin and a spring, and the total length is about 1800 mm. A catheter body for body lumen occlusion was prepared. Also, it has a circular section of an inner diameter of 0.42 mm, and has an insertion portion to be inserted by inserting the seal portion of the catheter body, and the adapter outermost surface portion of the insertion portion is processed into a shape that opens outward in a tapered shape. When the catheter body is inserted and inserted into the adapter made of polycarbonate, the silicon airtight member arranged in the insertion portion, and the adapter, the insertion portion has a holding mechanism for fixing the relative position of the catheter body and the adapter. An adapter having the structure shown in FIG. 4 having a hollow cylindrical structure with an outer diameter of 0.18 mm, which is made of stainless steel, has a tip cut obliquely, and has a hole formed on the side surface, is manufactured. A catheter system represented by
(Example 2)
The main shaft is a cylindrical proximal shaft having a circular outer diameter of 0.33 mm (made of stainless steel coated with Teflon (registered trademark)) and a cylindrical distal shaft having a circular outer diameter of 0.33 mm (surface Teflon ( (Registered trademark) coated NiTi steel). A balloon made of polyurethane, an inner surface of the guide wire lumen made of polyethylene, and a tip shaft made of polyamide elastomer as a main body were assembled and connected to the main shaft. In addition, a tubular stainless steel tube having a circular cross section with an outer diameter of 0.36 mm has an outer diameter of 0.29 mm (a polyimide thin-film tubular body is attached inside the portion and the inner diameter is 0.20 mm). The parts that have been drawn so as to have a valve body having a taper with a maximum diameter of 0.25 mm to a minimum diameter of 0.17 mm, and a protruding portion of the valve body with an outer diameter of 0.17 mm are proximal to the catheter body. A seal part was constructed as shown in FIG. 6 in a state of projecting about 1.5 mm relative to the outside of the catheter relative to the end, and a catheter body for body lumen occlusion having a total length of about 1800 mm was produced. Also, it has a circular section of an inner diameter of 0.42 mm, and has an insertion portion to be inserted by inserting the seal portion of the catheter body, and the adapter outermost surface portion of the insertion portion is processed into a shape that opens outward in a tapered shape. When the catheter body is inserted and inserted into the adapter made of polycarbonate, the silicon airtight member arranged in the insertion portion, and the adapter, the insertion portion has a holding mechanism for fixing the relative position of the catheter body and the adapter. A pressing structure made of a stainless steel metal mesh (SUS304-350) was placed therein to produce an adapter having the configuration shown in FIG. 7, and a catheter system as shown in FIG. 2 was obtained.
(Comparative example)
As a comparative example, a percussion occlusion balloon catheter (G14-6-200A), which is a catheter for occluding a body lumen, manufactured by Medtronic, was used.

(Evaluation)
Using the above-described catheter for occluding a body lumen of Example 1, an attempt was made to simulate expansion treatment with a dilatation balloon and the generated thrombus and atheroma suction while the internal carotid artery of the pig was occluded. A 6F guide catheter was inserted from the porcine femoral artery and placed up to the common carotid artery. The catheter body of Example 1 was inserted into the internal carotid artery through the guide catheter. Using the main shaft of the catheter body of Example 1 like a guide wire, the dilatation balloon catheter prepared for dilatation was advanced to the vicinity of the balloon portion of the catheter for occlusion of the inner diameter artery. After inserting and connecting the adapter locking mechanism to the catheter body of Example 1, the contrast medium 50% physiological saline was introduced into the balloon through the adapter, and the balloon was expanded to occlude the internal carotid artery. The dilatation balloon was deflated immediately after the dilatation balloon catheter was dilated and maintained in the dilated state for 30 seconds. The adapter of the catheter system of Example 1 was removed, and the dilatation balloon catheter was removed while the occlusion catheter balloon was dilated. Subsequently, the thrombus aspiration catheter was advanced to the vicinity of the balloon portion of the occlusion catheter by using the main shaft of the catheter body of Example 1 like a guide wire, and a suction operation was performed. After removing the thrombus aspiration catheter, the adapter is connected again to the catheter body of Example 1, the contrast medium is removed through the adapter, the balloon is deflated and the blood flow is recirculated, and then the catheter system of Example 1 is used. Removed from the body. The time from when the adapter was connected to the intraluminal lumen occlusion catheter of Example 1 until the blood flow was recirculated was 3 minutes and 40 seconds.

  The same operation was performed with the catheter for occluding a body lumen of Example 2, but the time from when the adapter was connected until the blood flow was recirculated was 3 minutes and 40 seconds.

  The same operation was performed using the comparative example. However, to connect the adapter, open the lid of the adapter, put the gold marker on the proximal side of the catheter in the center of the blue clip, straighten it, and move closer to the gold marker. Place the distal part into the gray clip, flush the extension tube until the contrast agent flows from the adapter inflation port, close the adapter, close the latch mechanism, and set the dial notch of the adapter to “OPEN”. Since stepwise operation is required, the time until blood flow was recirculated was 4 minutes and 20 seconds.

It is a schematic diagram of the catheter main body for demonstrating the embodiment of the catheter system which concerns on this invention. It is a schematic diagram for demonstrating the embodiment of the catheter system which concerns on this invention. It is a schematic diagram of one embodiment of the catheter main body proximal part concerning the present invention. 1 is a schematic diagram of one embodiment of a catheter adapter according to the present invention. 1 is a schematic diagram of one embodiment of a catheter system according to the present invention. It is a schematic diagram of one embodiment of the catheter main body proximal part concerning the present invention. 1 is a schematic diagram of one embodiment of a catheter adapter according to the present invention. It is a schematic diagram of one embodiment of a catheter main body concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Balloon 102 Main shaft 103 Proximal part 201 Balloon 202 Main shaft 204 Adapter 205 Adapter and syringe connection circuit 206 Syringe 302 Main shaft 303 Proximal part 307 Valve body 308 Seal surface 309 Proximal end 310 Spring 310 Spring fixing part 404 Adapter 405 Adapter and Syringe Connection Circuit 412 Insertion Portion 413 Airtight Member 414 Catheter Holding Portion 415 Spring Material 416 Member 417 Projection-Shaped Structure 418 Portion Obliquely Cut 419 Hole 420 Fluid Passage 425 Taper Portion 504 Adapter 505 Adapter and Syringe Connection circuit 507 Valve body 509 Proximal end 512 Insertion part 513 Airtight member 514 Catheter holding part 515 Spring material 516 Member 517 Projection-like structure 518 Hole 520 Fluid passage 525 Tapered portion 602 Main shaft 603 Proximal portion 607 Valve body 608 Seal surface 609 Proximal end 610 Spring 621 Protruding portion 704 Adapter 705 Adapter and syringe connection circuit 712 Insertion part 713 Airtight member 714 Catheter holding part 715 Spring material 716 Member 722 Pressing structure 725 Taper part 804 Adapter 805 Adapter and syringe connection circuit 807 Valve body 809 Proximal end 812 Insertion part 813 Airtight member 814 Spring Material 816 Member 820 Fluid passage 821 Protruding portion 822 Pressing structure 825 Taper portion

Claims (14)

  A balloon, a tubular body having an inflation lumen through which fluid for expanding or contracting the balloon can be moved, a catheter body having a fluid seal portion for sealing the fluid to a proximal portion of the tubular body, and a connection to the catheter body A catheter system comprising an adapter, wherein the seal is opened by inserting and inserting the seal portion of the catheter body into the adapter, and the seal is closed by removing the seal portion from the adapter. Catheter system.   2. The catheter according to claim 1, wherein the adapter includes an adapter having an insertion portion inserted into the seal portion and inserted such that the shaft of the seal portion to be inserted is always inserted at a fixed position with respect to the adapter. system.   3. An airtight member is provided in the insertion portion of the adapter in order to maintain airtightness between the inflation lumen of the catheter and the fluid supply portion of the adapter when the catheter body is inserted and inserted into the adapter. Catheter system.   4. The catheter system according to claim 2, further comprising a holding mechanism for fixing a relative position between the catheter body and the adapter when the catheter body is inserted and inserted into the adapter.   The catheter system according to claim 2, wherein the adapter has an insertion portion into which the seal portion is inserted, and the adapter outermost surface portion of the insertion portion has a shape that opens outward in a tapered shape.   6. The catheter system according to claim 2, wherein the adapter has an insertion portion into which the seal portion is inserted and inserted, and the cross-sectional shape of the insertion portion is similar to the cross-sectional shape of the seal portion.   The catheter system according to claim 6, wherein the cross-sectional shape of the insertion portion of the adapter and the cross-sectional shape of the seal portion of the catheter body are both circular.   The valve body that substantially seals the fluid so that it is occluded when not inserted into the adapter is inserted into the adapter by inserting the seal part of the catheter body into the adapter with a protruding structure attached to the adapter insertion part. The catheter system according to any one of claims 1 to 7, wherein the seal is opened by the valve body being displaced by a projecting structure attached to the insertion portion of the adapter in accordance with the operation to be performed. .   9. The catheter system according to claim 8, wherein the projecting structure is a hollow cylindrical structure and has a structure that allows a fluid for expanding or contracting the balloon to pass therethrough.   The catheter system according to claim 9, further comprising a portion that is obliquely cut at a distal end of the cylindrical structure.   The catheter system according to claim 9, wherein a hole for allowing fluid to pass through is provided in a side surface of the cylindrical structure.   A seal part having a protruding part that protrudes outside the catheter, and a valve body that substantially seals fluid so as to be in a closed state when not inserted into the adapter; With the pressing structure that pushes the protruding portion, the valve body is displaced by the pressing structure when the sealing portion of the catheter body is inserted and inserted into the adapter, so that the seal is opened. 8. The catheter system according to claim 1, wherein   13. The catheter system according to claim 12, wherein the pressing structure disposed in the insertion portion of the adapter is a mesh-like structure capable of passing a fluid for expanding or contracting the balloon.   The catheter system according to claim 12, wherein the pressing structure disposed in the insertion portion of the adapter is a porous structure capable of passing a fluid for expanding or contracting the balloon.

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