Controllable release balloon catheter

Abstract

The invention relates to the technical field of medical instruments, in particular to a controllable release balloon catheter which comprises a micro catheter and an outer sleeve which are coaxially arranged, and the outer sleeve is movably arranged relative to the micro catheter in the axial direction; the catheter seat is connected with the micro catheter and the near end of the outer sleeve, the catheter seat comprises a liquid filling cavity communicated with the near end of the micro catheter and a filling cavity, the filling cavity is communicated with a gap between the outer sleeve and the micro catheter, and a filling balloon communicated with the gap is arranged at the far end of the outer sleeve; the micro-catheter comprises a body section and a disengagement section, the near end of the disengagement section is detachably connected with the far end of the body section, and an inner cavity of the disengagement section is communicated with an inner cavity of the body section to form the micro-catheter; the far end of the outer sleeve and the near end of the releasing section form a releasing structure, and the releasing structure is configured to be that when the outer sleeve moves towards the near end relative to the microcatheter till the releasing section is located on the outer side of the outer sleeve, the body section is separated from the releasing section. The disengagement of the micro-catheter is controllable, blood vessels are not damaged, and the embolic agent is not disengaged.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a controllable release balloon catheter. Background Art

[0002] In the treatment of neurovascular diseases, in addition to surgical resection and radiotherapy, interventional therapy has become an irreplaceable treatment method. The embolic materials and embolic catheters used for different diseases are different, but the use of liquid embolic agents and embolic microcatheter technology is currently considered to be the safest and most effective method for treating cerebral arteriovenous malformations and dural venous fistulas.

[0003] The current intravascular interventional embolization technology is to obtain vascular access through arterial or venous puncture, use guidewires, catheters and other instruments to enter the deformed lesion site, and then inject liquid embolic agents through the embolization microcatheter to block the lesion site, thereby achieving the purpose of treatment. During the embolization process, a small amount of embolic agent backflow is usually required to block the proximal blood supply artery to ensure that the embolic agent can better diffuse to the target location. However, there are risks in the backflow of embolic agents, mainly the following two points: the backflow of embolic agents into the blood supply artery of normal brain tissue causes cerebral infarction; the microcatheter is entangled, making it difficult or even impossible to remove the tube. Due to concerns about the risk of reflux, insufficient reflux often occurs, making it impossible for the embolic agent to fully diffuse and achieve the desired effect.

[0004] In the related art, the embolic agents used for intravascular interventional embolization therapy are mostly liquid mixtures. The embolic agents are fluid and will form a colloid mold in a relatively short period of time. Therefore, when the embolic agents are injected through a microcatheter, the embolic agents are prone to diffuse along the microcatheter. Due to the characteristic that the embolic agents form a colloid mold in a relatively short period of time, the microcatheter is often clamped in the colloid of the mold, making it difficult or even impossible to withdraw the tube. The microcatheter technology with a detachable head end currently used in clinical practice can reduce the shortcomings of the existing technology to a certain extent, but it cannot control the backflow of the embolic agent. Once the embolic agent backflow exceeds its release point, it will still cause the microcatheter to be stuck, making it difficult or even impossible to withdraw the tube. If the tube is forcibly withdrawn, it may cause secondary damage to the diseased blood vessels or bring out the embolic agent. Summary of the invention

[0005] In view of at least one of the above technical problems, the present invention provides a controllable detachable balloon catheter, which adopts structural improvement to improve the safety of catheter removal.

[0006] According to one aspect of the present invention, there is provided a controllable detachable balloon catheter, comprising:

[0007] A microcatheter and an outer sleeve are coaxially arranged, wherein the outer sleeve is movably arranged relative to the microcatheter in the axial direction;

[0008] A catheter seat connected to the proximal end of the microcatheter and the outer sleeve, the catheter seat comprising a liquid-filled cavity and a filling cavity communicated with the proximal end of the microcatheter, the filling cavity communicating with the gap between the outer sleeve and the microcatheter, and a filling balloon communicating with the gap on the distal end of the outer sleeve;

[0009] The microcatheter comprises a main body section and a release section, the proximal end of the release section is detachably connected to the distal end of the main body section, and the inner cavity of the release section is connected to the inner cavity of the main body section to form the microcatheter;

[0010] A release structure is formed between the distal end of the outer sleeve and the proximal end of the release section, and the release structure is configured so that when the outer sleeve moves toward the proximal end relative to the microcatheter until the release section is outside the outer sleeve, the main section is separated from the release section.

[0011] In some embodiments of the present invention, the diameter of the release section is smaller than the diameter of the main body section, and the proximal end of the release section is flared.

[0012] In some embodiments of the present invention, the release structure includes an inner boss arranged at the distal end of the outer sleeve and an outer boss arranged at the proximal end of the release section, the outer boss is located at the proximal end of the inner boss when not released, and the inner boss and the outer boss form an staggered sealing structure in the direction of the tube wall thickness.

[0013] In some embodiments of the present invention, the outer boss is an annular structure, and the inner boss is intermittently arranged in the circumferential direction.

[0014] In some embodiments of the present invention, the surfaces of the inner boss and the outer boss opposite to each other are parallel inclined surfaces, and the outer ends of the inclined surfaces are close to the catheter seat.

[0015] In some embodiments of the present invention, the proximal end of the release segment is tightly butted against the distal end of the main body segment when not released, and a first sealing layer is coated on the outside of the butted portion.

[0016] In some embodiments of the present invention, the distal end of the outer sleeve is in a constricted shape, and an outer region of the distal end of the outer sleeve in contact with the release section is coated with a second sealing layer.

[0017] In some embodiments of the present invention, the proximal end of the outer sleeve has a telescopic section, and the telescopic section is made of a flexible polymer material.

[0018] In some embodiments of the present invention, the distal end of the telescopic section further has a pull ring for controlling the movement of the outer sleeve.

[0019] In some embodiments of the present invention, a developing ring is provided at the distal end of the release section and inside the inner boss and the outer boss.

[0020] The beneficial effects of the present invention are as follows: the present invention forms a release structure through the release section of the distal end of the outer sleeve and the microcatheter, so that after the microcatheter completes the blockage of the diseased blood vessel, it remains in the diseased blood vessel by being released by the release section, and the release is achieved by the relative movement of the outer sleeve. Compared with the prior art, the release timing of the microcatheter is precisely controllable and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of a controllable detachable balloon catheter in an embodiment of the present invention;

[0023] Figure 2 It is a partial enlarged structural schematic diagram of the release structure in an embodiment of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the release structure in the embodiment of the present invention when it is expanded;

[0025] Figure 4 It is a structural schematic diagram of the release mechanism in the embodiment of the present invention when the outer boss passes through the inner boss;

[0026] Figure 5 It is a structural schematic diagram of the release mechanism in the embodiment of the present invention when the release is completed;

[0027] Figure 6 Schematic diagram of the connection structure between the catheter seat and the outer sleeve in an embodiment of the present invention.

[0028] Figure numerals: 1. microcatheter; 11. main body section; 12. release section; 2. outer sleeve; 21. filling balloon; 22. telescopic section; 23. pull ring; 3. catheter seat; 31. liquid filling cavity; 32. filling cavity; 4. release structure; 41. inner boss; 42. outer boss; 43. first sealing layer; 44. second sealing layer; 5. developing ring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] The detachable end in the prior art cannot control the backflow of the embolic agent, and the detachable catheter head end adopts a degradable coating material, which makes the catheter head end uncontrollable when detached, and there is a great risk of use. For example, premature detachment may lead to blockage of normal blood vessels. If the detachment time is long, the operation time will be prolonged. In addition, the detachable catheter adopts a mechanical structure, and the catheter head end is detached by adjusting the pulling force, which poses a risk of catheter use. If the pushing or withdrawal exceeds the specified pulling force during the process of the catheter being in place, the catheter may be detached prematurely, resulting in blockage of normal blood vessels. If the catheter is detached after embolism, excessive pulling force may cause secondary damage to the diseased blood vessels or bring out the embolic agent. In order to solve the above problems, the present invention arranges an inflatable balloon at the distal end of the catheter, which, when the embolic agent is normally injected, plays a role in blocking the proximal blood flow and preventing the embolic agent from flowing back into the normal blood supply artery. After the embolic agent is completely embolized, in order to allow the catheter to be better withdrawn, the tip of the microcatheter close to the balloon is designed as a detachable structure, so that the catheter completely fixed in the embolic agent can be released, thereby withdrawing the catheter; the following part of the embodiment of the present application will exemplarily illustrate the inventive concept of the present application.

[0033] like Figures 1 to 6 The controllable release balloon catheter shown in the figure comprises a coaxially arranged microcatheter 1 and an outer sleeve 2, and a catheter seat 3; Figure 1 and Figure 2 As shown in , in the embodiment of the present invention, there is a gap between the microcatheter 1 and the outer sleeve 2, so that the outer sleeve 2 can move relative to the microcatheter 1 in the axial direction, that is, the outer sleeve 2 can be axially extended; please continue to refer to Figure 1In the embodiment of the present invention, the catheter seat 3 is connected to the proximal end of the microcatheter 1 and the outer tube 2. The catheter seat 3 includes a filling cavity 31 and a filling cavity 32 connected to the proximal end of the microcatheter 1. The filling cavity 32 is connected to the gap between the outer tube 2 and the microcatheter 1. The distal end of the outer tube 2 has a filling balloon 21 connected to the gap. When the filling liquid is filled into the gap between the outer tube 2 and the microcatheter 1 through the filling cavity 32, the filling balloon 21 can expand to block the blood flow at the proximal end and prevent the embolic agent from flowing back. It should be pointed out here that in the embodiment of the present application, the proximal end refers to the end close to the operator, and the distal end refers to the end away from the operator. When performing the specific operation, the catheter seat 3 is generally held by hand, and the filling agent is filled into the filling cavity 32 to expand the balloon or the embolic agent is flushed into the filling cavity 31 to block the diseased blood vessel. In the embodiment of the present application, the filling balloon 21 is made of silicone or TPE material, that is, thermoplastic elastomer, which has a certain elasticity and increases in volume and expands when filled. In the embodiment of the present application, through the setting of the filling balloon 21, the filling balloon 21 can be used to block the proximal blood supply artery, which can replace the prior art of blocking the proximal blood supply artery by the backflow of embolic agents, thereby improving the safety of the operation.

[0034] like Figure 2As shown in , the microcatheter 1 includes a main body section 11 and a release section 12, the proximal end of the release section 12 is detachably connected to the distal end of the main body section 11, and the inner cavity of the release section 12 is connected to the inner cavity of the main body section 11 to form the microcatheter 1; it should be pointed out here that in some embodiments of the present application, the inner layer of the microcatheter 1 can be made of PTFE material, that is, polytetrafluoroethylene material, the middle layer is a metal reinforcement layer, and the outer layer is a polymer layer. In this embodiment, the main body section 11 is a three-layer structure, and the release section 12 is a single-layer structure, and the single-layer structure of the release section 12 is made of PTFE material. Those skilled in the art can make a choice as needed. In an embodiment of the present application, a release structure 4 is formed at the distal end of the outer sleeve 2 and the proximal end of the release section 12, and the release structure 4 is configured so that when the outer sleeve 2 moves toward the proximal end relative to the microcatheter 1 until the release section 12 is outside the outer sleeve 2, the main body section 11 is separated from the release section 12. Of course, it should be pointed out here that the release structure 4 has a variety of structural forms. For example, the release segment 12 and the main body segment 11 are abutted, and are connected by extrusion, mechanical snap connection or tearable connection with the help of the end of the outer sleeve 2. When the outer sleeve 2 shrinks toward the proximal end so that the release segment 12 is separated from the force of the outer sleeve 2 and is outside the outer sleeve 2, the force of the outer sleeve 2 disappears, or under the further push of the outer sleeve 2, the release segment 12 is separated from the main body segment 11, and then the release segment 12 is separated from the balloon catheter as a whole, leaving the release segment 12 in the diseased blood vessel. In an embodiment of the present invention, the release segment 12 adopts a single-layer polymer material, which will not cause damage to the blood vessels at the lesion, thereby greatly improving the safety of tube removal. In one embodiment of the present invention, the outer sleeve 2 is arranged on the outer peripheral side of the release structure 4 to wrap the release structure 4 to prevent the backflow of the embolic agent during the operation from causing the embolic agent to wrap around the release structure 4 and cause difficulty in release. In this way, the outer sleeve 2 can isolate the embolic agent. Even if the embolic agent is slightly adhered to the outer surface of the outer sleeve 2, since the outer sleeve 2 is movably arranged, it can be easily separated under the action of external force.

[0035] In the above embodiment, the release structure 4 formed by the distal end of the outer sleeve 2 and the release section 12 of the microcatheter 1 allows the microcatheter 1 to remain in the diseased blood vessel by being released by the release section 12 after completing the blockage of the diseased blood vessel, and the release is achieved by the relative movement of the outer sleeve 2 during the release. Only the structure of the microcatheter 1 itself is displaced, which has no effect on the release section 12 retained in the embolic agent, that is, it does not damage the blood vessel and does not cause the embolic agent to fall out. Compared with the prior art, the release timing of the microcatheter 1 is precisely controllable and safe.

[0036] Based on the above examples, please continue to refer to Figure 2In an embodiment of the present application, the tube diameter of the release section 12 is smaller than the tube diameter of the main body section 11. In this embodiment, the inner diameter of the release section 12 is smaller than the inner diameter of the main body section 11, and the outer diameter of the release section 12 is smaller than the outer diameter of the main body section 11, and the connection is connected by a tapered surface transition; in another embodiment of the present invention, the tube diameter of the release section 12 is smaller than the tube diameter of the main body section 11, and the tube diameter here refers to the outer diameter, that is, in this implementation, the inner diameter of the release section 12 is equal to the inner diameter of the main body section 11, and the outer diameter of the release section 12 is smaller than the outer diameter of the main body section 11, and the inner diameter of the release section 12 is equal to the inner diameter of the main body section 11, forming an internal smooth delivery channel, and the resistance of the embolic agent at the connection will not suddenly increase due to the sudden decrease in the inner diameter, causing the reaction force of the release section 12 to increase, which is easy to cause the contact surface of the connection to separate, or cause the release section 12 to produce micro-displacement, causing negative impact during the operation; please continue to refer to Figure 2 The proximal end of the release segment 12 is flared. By setting the diameter of the release segment 12 to be smaller than the diameter of the main body segment 11, on the one hand, the accuracy of extending the distal end of the release segment 12 into the diseased blood vessel can be improved, and on the other hand, the contact area with the outer sleeve 2 can be reduced, thereby reducing the friction and reducing the difficulty of operation when the outer sleeve 2 moves; in addition, by setting the proximal end of the release segment 12 to a flared shape, that is, a trumpet-shaped structure, on the one hand, the reliability of docking with the main body segment 11 can be improved, and on the other hand, when the outer sleeve 2 shrinks toward the proximal end, the main body segment 11 can apply a more stable thrust to the flared segment, thereby improving the accuracy of the relative movement of the release segment 12 and avoiding misalignment between the main body segment 11 and the release segment 12.

[0037] In the embodiment of the present application, an exemplary structure of the release structure 4 is as follows: Figure 2 As shown in , the release structure 4 includes an inner boss 41 disposed at the distal end of the outer sleeve 2 and an outer boss 42 disposed at the proximal end of the release section 12. The outer boss 42 is located at the proximal end of the inner boss 41 when not released, and the inner boss 41 and the outer boss 42 form a staggered sealing structure in the direction of the tube wall thickness. It should be pointed out here that in the embodiment of the present application, the inner boss 41 refers to a structure disposed on the inner wall of the outer sleeve 2, protruding toward and fitting the outer wall of the release section 12, and the outer boss 42 refers to a structure disposed on the outer wall of the release section 12, protruding toward the inner wall of the outer sleeve 2, and fitting the inner wall of the outer sleeve 2; as shown in Figure 2 As shown in the embodiment of the present application, the outer wall of the outer boss 42 is closely fitted with the inner wall of the outer sleeve 2 to form a sealing structure to prevent leakage when the filling balloon 21 is filled with liquid. In addition, it should be pointed out that the staggered sealing here means that under the axial blocking and squeezing action of the inner boss 41, the outer boss 42 can maintain close contact with the inner wall of the outer sleeve 2 when it is not released to improve the sealing performance.

[0038] Optionally, in the embodiment of the present application, the inner boss 41 and the outer boss 42 are staggered by the deformable distal end of the outer sleeve 2. In the embodiment of the present application, the distal end of the outer sleeve 2 is made of a deformable polymer material, and the outer boss 42 is an annular structure. The inner boss 41 is intermittently arranged in the circumferential direction. Such an arrangement ensures that the distal end of the outer sleeve 2 is more conducive to the expansion of the distal end of the outer sleeve 2 when the expansion deformation occurs. If the inner boss 41 is non-intermittently arranged, that is, it is arranged along the inner wall of the distal end of the outer sleeve 2 for a circle, when the inner boss 41 crosses the outer boss 42, the thickness of the inner boss 41 is greater than the thickness of the outer sleeve 2. In order to ensure the clamping strength, the inner boss 41 itself is difficult to deform, and the outer sleeve 2 is relatively easy to deform relative to the inner boss 41. Therefore, the inner boss 41 is intermittently arranged, which can not only ensure the clamping with the outer boss 42, but also ensure that the outer sleeve 2 is deformed at the gap of the inner boss 41. In the embodiment of the present application, the outer boss 42 is a continuous annular structure to ensure sealing, and in the embodiment of the present application, the specific release method of the release section 12 is as follows: Figures 3 to 5 As shown in the figure, the outer sleeve 2 is made of a deformable material at the distal end, and the inner boss 41 is intermittently arranged in the circumferential direction, so that when the outer sleeve 2 contracts toward the proximal end, under the squeezing action of the outer boss 42, the distal end of the outer sleeve 2 and the inner boss 41 expand and deform together, so that during the continuous movement of the outer sleeve 2 toward the proximal end, the outer boss 42 on the release section 12 moves toward the distal end relative to the inner boss 41 on the outer sleeve 2. Figure 5 As shown in the figure, when the release segment 12 moves to the outside of the outer sleeve 2, the distal end of the outer sleeve 2 returns to its original shape from the expanded shape. Due to the loss of the force of the outer sleeve 2 and the inner boss 41, the release segment 12 is separated from the main body segment 11; of course, it should be pointed out here that the butt end surface of the release segment 12 and the main body segment 11 can also be set to an adhesive or tearable connection. After the outer sleeve 2 shrinks to the point where the release segment 12 moves relatively to the distal end of the outer sleeve 2, the distal end of the outer sleeve 2 can push the release segment 12 again after shrinking to ensure the separation between the release segment 12 and the main body segment 11.

[0039] Please continue to refer to Figure 2 In the embodiment of the present invention, in order to facilitate the expansion of the inner boss 41, the opposite surface of the inner boss 41 and the outer boss 42 is a parallel inclined surface, and the outer end of the inclined surface is close to the catheter seat 3. It should be noted that the opposite surface refers to the surface where the inner boss 41 and the outer boss 42 are close to each other. The inclination is relative to the plane of the inner boss 41 and the outer boss 42. The inclination angle is 25° to 75°. As a preferred solution, the inclination angle of the inclined surface is 45°. That is, Figure 2As shown in the figure, the abutting surfaces of the outer boss 42 and the inner boss 41 are inclined so that the end surface of the outer boss 42 facing the inner boss 41 is in a conical structure. Through this form of arrangement, when the outer sleeve 2 moves toward the proximal end, the end surface of the outer boss 42 on the release section 12 will exert a radial outward expansion force on the inner boss 41, thereby making the distal end of the outer sleeve 2 and the inner boss 41 easier to deform, thereby reducing the difficulty of operation.

[0040] In addition, in the embodiment of the present application, in order to prevent the liquid from entering the microcatheter 1 from the joint between the release section 12 and the main section 11 when the inflation balloon 21 is filled with liquid, Figure 2 As shown in the figure, the proximal end of the release section 12 is tightly connected with the distal end of the main body section 11 when not released, and a first sealing layer 43 is coated on the outside of the connection. It should be pointed out here that the sealing layer here relies on the force between the inner boss 41 and the outer boss 42 to maintain the sealed connection between the main body section 11 and the release section 12. After being freed from the external force, the first sealing layer 43 is easy to fall off and will not affect the release of the release section 12.

[0041] In addition, please continue to refer to Figure 2 Since the inner boss 41 is intermittently arranged, in order to further avoid leakage of the filling balloon 21 during filling, the distal end of the outer sleeve 2 is in a constricted shape, and the outer area of ​​the distal end of the outer sleeve 2 in contact with the release section 12 is coated with a second sealing layer 44. It should also be pointed out here that the sealing strength of the second sealing layer 44 can ensure the filling pressure, and at the same time can meet the requirement that the outer sleeve 2 is moved and loses the seal and can move relatively; in the embodiment of the present application, since the tube is withdrawn after the embolic agent is filled, the movement of the outer sleeve 2 will not cause the filling liquid to enter the diseased blood vessel. On the one hand, the embolic agent has formed a cast gel in the diseased blood vessel, and on the other hand, the filling balloon 21 has been evacuated and shrunk before the tube is withdrawn. Therefore, when the outer sleeve 2 is pulled to destroy the second sealing layer 44, the filling liquid will not enter the diseased blood vessel, and the safety of the operation can be guaranteed.

[0042] Please continue to refer to Figure 6In the embodiment of the present application, in order to facilitate the contraction operation of the outer sleeve 2, the proximal end of the outer sleeve 2 has a telescopic section 22, and the telescopic section 22 is made of a flexible polymer material, such as polyethylene, polypropylene, polyvinyl chloride, polycarbonate and polylactic acid, etc. In one embodiment, the telescopic section 22 is made of PTFE material. The telescopic section 22 here can be set to a structure similar to a bellows, which is easy to contract in the axial direction of the microcatheter 1. There are also many flexible polymer materials, such as thermoplastic polyurethane elastomer, or polysiloxane, polycaprolactone, etc., and the rest of the main body section 11 of the microcatheter 1 can be set to a straight tubular structure. In this way, the outer sleeve 2 can be easily contracted by only pulling or pushing the telescopic section 22; in addition, in order to more conveniently operate the telescopic section 22, please continue to refer to Figure 6 The telescopic section 22 also has a pull ring 23 at the distal end thereof for controlling the movement of the outer sleeve 2. It should be noted that the pull ring 23 can be made of a hard material such as hard plastic or metal. When the operation is performed, the telescopic section 22 can be telescoped by simply holding the pull ring 23 and pulling or pushing it. The outer sleeve 2 can be conveniently moved by pulling or pushing the pull ring 23.

[0043] In the embodiment of the present application, in order to facilitate observation of the surgical situation during the operation, the distal end of the release section 12 and the inner boss 41 and the outer boss 42 are provided with a developing ring 5. It should be pointed out here that the developing ring 5 is usually made of a high-density material with good X-ray blocking performance, which can be clearly displayed under X-rays to help the operator accurately determine the position under the guidance of the imaging device, thereby better improving the safety of the operation. By arranging the developing ring 5 at the distal end of the release section 12, it can be clearly known whether the release section 12 enters the diseased blood vessel. By arranging the developing ring 5 on the inner boss 41 and the outer boss 42, since the inner boss 41 is intermittently arranged, the developing ring 5 therein is also arranged at intervals, so it can be accurately judged whether the release section 12 is released.

[0044] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A controllable release balloon catheter, characterized in that: include: A microcatheter and an outer sleeve are coaxially arranged, wherein the outer sleeve is movably arranged relative to the microcatheter in the axial direction; A catheter seat connected to the proximal end of the microcatheter and the outer sleeve, the catheter seat comprising a liquid-filled cavity and a filling cavity communicated with the proximal end of the microcatheter, the filling cavity communicating with the gap between the outer sleeve and the microcatheter, and a filling balloon communicating with the gap on the distal end of the outer sleeve; The microcatheter comprises a main body section and a release section, the proximal end of the release section is detachably connected to the distal end of the main body section, and the inner cavity of the release section is connected to the inner cavity of the main body section to form the microcatheter; A release structure is formed between the distal end of the outer sleeve and the proximal end of the release section, and the release structure is configured so that when the outer sleeve moves toward the proximal end relative to the microcatheter until the release section is outside the outer sleeve, the main section is separated from the release section.

2. The controllable detachable balloon catheter according to claim 1, characterized in that: The diameter of the release section is smaller than the diameter of the main body section, and the proximal end of the release section is in a flared shape.

3. The controllable detachable balloon catheter according to claim 1, characterized in that: The release structure includes an inner boss arranged at the distal end of the outer sleeve and an outer boss arranged at the proximal end of the release section. The outer boss is located at the proximal end of the inner boss when not released, and the inner boss and the outer boss form a staggered sealing structure in the direction of the tube wall thickness.

4. The controllable detachable balloon catheter according to claim 3, characterized in that: The outer boss is an annular structure, and the inner boss is intermittently arranged in the circumferential direction.

5. The controllable detachable balloon catheter according to claim 4, characterized in that: The surfaces of the inner boss and the outer boss opposite to each other are parallel inclined surfaces, and the outer ends of the inclined surfaces are close to the catheter seat.

6. The controllable detachable balloon catheter according to claim 2, characterized in that: The proximal end of the release segment is tightly butted against the distal end of the main body segment when not released, and a first sealing layer is coated on the outside of the butted portion.

7. The controllable detachable balloon catheter according to claim 6, characterized in that: The distal end of the outer sleeve is in a constricted shape, and the outer area of ​​the distal end of the outer sleeve in contact with the release section is coated with a second sealing layer.

8. The controllable detachable balloon catheter according to claim 1, characterized in that: The proximal end of the outer sleeve is provided with a telescopic section, and the telescopic section is made of a flexible polymer material.

9. The controllable detachable balloon catheter according to claim 8, characterized in that: The distal end of the telescopic section is also provided with a pull ring for controlling the movement of the outer sleeve.

10. The controllable detachable balloon catheter according to claim 3, characterized in that: The far end of the release section and the inner and outer bosses are all provided with developing rings.

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