Detachable occlusion balloon

Abstract

The application provides a detachable blocking balloon, and relates to the technical field of medical devices. The detachable blocking balloon comprises a catheter assembly, a valve assembly and a balloon assembly; the valve assembly comprises a valve seat and a valve core movably connected to the valve seat; the catheter assembly is detachably connected to the valve seat; in the state that the catheter assembly is connected to the valve seat, the catheter assembly drives the valve core and opens an inner cavity channel of the valve seat, and the catheter assembly is in fluid communication with the balloon assembly through the inner cavity channel; in the state that the catheter assembly is disconnected from the valve seat, the valve core seals the inner cavity channel. The catheter assembly can reach the distal end of a diseased part of the intestinal tract of a patient through an intestinal endoscope forceps channel, the inflated balloon blocks the intestinal tract, the catheter assembly is disconnected from the valve seat and withdrawn, and the forceps channel is emptied, so that the intestinal endoscope does not need to be withdrawn from the intestinal tract, the distal end of the intestinal tract is blocked, and the near end of the intestinal tract being treated is prevented from being contaminated by the far end of the intestinal tract. The detachable blocking balloon can realize the connection and opening and the disconnection and sealing, the endoscope forceps channel space is completely released after the balloon is inflated, and the efficiency of the collaborative operation of multiple devices is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a detachable occlusion balloon. Background Technology

[0002] Endoscopic diagnostic and treatment techniques have become key tools for early screening, precise biopsy, and minimally invasive treatment of digestive tract diseases. Among them, colonoscopy, with its advantages of high repeatability, intuitive visualization, and standardized operating channel (i.e., forceps channel), is widely used in scenarios such as polyp removal, hemostasis, stricture dilation, and intraoperative localization. To achieve functions such as mechanical dilation of lesions within the lumen, compression hemostasis, traction, or spatial marking, clinicians often use inflatable balloon devices inserted through the forceps channel. These devices typically consist of a balloon body made of flexible polymer materials (such as polyurethane, silicone, or latex), a connecting catheter, and an external inflation unit. Gas (such as air, CO2, etc.) or saline, contrast agents, etc., are injected into the balloon cavity through the catheter via a gas or liquid source, causing it to inflate within the target intestinal segment and maintain stable pressure.

[0003] However, existing balloon devices generally employ a continuous external power supply structure: the catheter runs the entire length of the endoscopic forceps channel and maintains a rigid connection with an external gas / liquid source, requiring the external switch to be closed to maintain constant intraballoon pressure. This design introduces three significant technical bottlenecks: First, the rigid occupation of the forceps channel. The diameter of the endoscopic forceps channel is typically only 2.8–3.7 mm, while the outer diameter of a conventional balloon catheter is already 1.8–2.4 mm. Once the catheter continuously occupies the forceps channel, it completely blocks the synchronous entry and exit of other instruments (such as biopsy forceps, snares, injection needles, radiofrequency probes, etc.), leading to an inefficient "one-use-one-change" operating mode, significantly prolonging the operation time (clinical statistics show that the average time for a single instrument change increases by 12–18 seconds).

[0004] Second, the degree of freedom of operation is severely limited. The continuously connected catheter forms a rigid fulcrum in the intestinal lumen, interfering with the axial rotation and flexion adjustment of the endoscope. Especially in anatomically complex areas such as the sigmoid colon junction and splenic flexure, it is easy to induce intestinal wall traction pain, mucosal tearing, or even perforation. At the same time, the dragging force generated by the catheter moving with the endoscope also exacerbates the operator's hand fatigue.

[0005] Third, the pressure maintenance mechanism lacks autonomy. Existing solutions rely on external equipment for continuous pressure supply. Once the gas source fluctuates, the pipeline bends, or the connection becomes loose, it can cause the balloon to collapse unexpectedly, resulting in clinical safety accidents such as hemostasis failure, positioning deviation, or dilation interruption. Adding a pressure feedback closed-loop system further increases the system complexity and cost, making it difficult to popularize in primary healthcare institutions.

[0006] While existing technologies have attempted to achieve "instant disengagement" through pre-inflated one-way valves, shape memory alloy plugs, or thermosensitive gel plugs, they all have significant limitations. For example, pre-inflated one-way valves cannot dynamically adjust pressure after inflation and are prone to reverse leakage due to intestinal peristalsis or changes in body position; shape memory alloys require specific temperature triggers for deformation, exhibiting sluggish response and poor repeatability at body temperature (37°C); and thermosensitive gels pose biocompatibility risks and uncontrollable degradation issues. Therefore, there is an urgent need for a detachable occlusion balloon that can achieve safe, reliable, and immediate disengagement from the catheter after balloon inflation, while also ensuring zero fluid leakage within the balloon cavity and long-term stable pressure after disengagement. Summary of the Invention

[0007] The purpose of this invention is to provide a detachable occlusion balloon to alleviate the technical problem in the prior art that an inflated balloon cannot maintain its inflation state and maintain stable pressure for a long time after release.

[0008] In a first aspect, the detachable occlusion balloon provided by the present invention includes: a catheter assembly, a valve assembly, and a balloon assembly; The valve assembly includes a valve seat and a valve core movably connected to the valve seat; The conduit assembly is detachably connected to the valve seat; With the catheter assembly connected to the valve seat, the catheter assembly drives the valve core and opens the inner cavity of the valve seat, and the catheter assembly is in fluid communication with the balloon assembly through the inner cavity; When the conduit assembly is disengaged from the valve seat, the valve core closes the inner cavity.

[0009] In conjunction with the first aspect, the present invention provides a first possible embodiment of the first aspect, wherein the valve seat has a proximal end connector and a cavity portion connecting the proximal end connector; The valve core is inserted into the cavity housing from the far end to the near end, passes through the proximal end connector, and extends out. The internal cavity extends axially through the proximal connector and the cavity shell.

[0010] In conjunction with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the valve core includes: a needle valve portion and a boss portion connecting the needle valve portion; The needle valve portion passes through the proximal connector and extends outwards, and an elastic element is installed inside the cavity housing portion that acts on the boss portion and causes the boss portion to have a tendency to move proximally.

[0011] In conjunction with the second possible implementation of the first aspect, the present invention provides a third possible implementation of the first aspect, wherein the proximal end of the needle valve portion is provided with a flat end.

[0012] In conjunction with the second possible implementation of the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein the distal end of the boss portion is connected to a spindle portion, and the elastic element is sleeved on the spindle portion.

[0013] In conjunction with the second possible implementation of the first aspect, the present invention provides a fifth possible implementation of the first aspect, wherein a sealing ring is installed near the proximal end of the boss portion, and the sealing ring is sleeved on the needle valve portion.

[0014] In conjunction with the first possible implementation of the first aspect, the present invention provides a sixth possible implementation of the first aspect, wherein the proximal connector and the catheter assembly are detachably connected via a threaded engagement.

[0015] In conjunction with the sixth possible implementation of the first aspect, the present invention provides a seventh possible implementation of the first aspect, wherein the catheter assembly includes: a synchronous rotating tube, an inner tube, and a proximal connector; The synchronous rotating tube is fitted with the inner tube, the inner tube is connected to the proximal connector, and the distal end of the synchronous rotating tube is fixedly connected to the proximal connector.

[0016] In conjunction with the seventh possible implementation of the first aspect, the present invention provides an eighth possible implementation of the first aspect, wherein the proximal connector includes: an externally threaded tube portion, an internally threaded tube portion, and an annular transition portion connecting the externally threaded tube portion and the internally threaded tube portion; The externally threaded tube portion is connected to the inner tube, and the internally threaded tube portion is connected to the proximal connector. The proximal connector is provided with an inflatable inner tube hole that passes through the externally threaded tube section and the internally threaded tube section.

[0017] In conjunction with the eighth possible implementation of the first aspect, the present invention provides a ninth possible implementation of the first aspect, wherein the cross-sectional shape of the inflatable inner tube hole perpendicular to the axis is circular, elliptical, or polygonal.

[0018] In conjunction with the first aspect, the present invention provides a tenth possible implementation of the first aspect, wherein the balloon assembly includes: a balloon catheter and a balloon body sleeved on the outside of the balloon catheter; The balloon body is connected to the balloon catheter, and the proximal end of the balloon catheter is in fluid communication with the internal cavity.

[0019] In conjunction with the tenth possible implementation of the first aspect, the present invention provides an eleventh possible implementation of the first aspect, wherein the distal end of the balloon catheter extends through the balloon body, and the distal end of the balloon catheter is fitted with a smooth plug.

[0020] In conjunction with the tenth possible implementation of the first aspect, the present invention provides a twelfth possible implementation of the first aspect, wherein the proximal end of the balloon catheter is connected to the valve seat via a distal connector.

[0021] In conjunction with the tenth possible implementation of the first aspect, the present invention provides a thirteenth possible implementation of the first aspect, wherein the diameter of the balloon body in the inflated state is 35 mm to 80 mm.

[0022] In conjunction with the tenth possible implementation of the first aspect, the present invention provides a fourteenth possible implementation of the first aspect, wherein, in the balloon body in the contracted state, the radial dimensions of the catheter assembly, the valve assembly, and the balloon assembly are all less than 3.1 mm.

[0023] The embodiments of this invention bring the following beneficial effects: By innovatively integrating the catheter assembly, valve assembly, and balloon assembly, and adopting a mechanical valve control logic of "connection opens, disconnection self-seales," the core clinical pain point of existing technologies—that balloon devices must continuously occupy the endoscopic forceps channel and restrict the coordinated operation of multiple instruments—is fundamentally solved. Its core beneficial effect lies in achieving tubeless residence after balloon inflation—after the catheter assembly completes balloon inflation, only axial withdrawal triggers automatic valve core reset, instantly sealing the valve seat cavity, thereby locking the medium (gas or liquid) inside the balloon and maintaining a stable inflation state without any continuous connection of external tubing. This mechanism completely frees up endoscopic forceps channel space, significantly improving the efficiency of intraoperative instrument replacement and operational freedom, and is particularly suitable for complex endoscopic interventional scenarios requiring the alternating use of biopsy forceps, injection needles, radiofrequency probes, or multi-channel therapeutic instruments.

[0024] This structure abandons sealing solutions that rely on external energy or special materials, such as electronic control or magnetic attraction. It relies entirely on a precisely matched mechanical structure (such as elastic valve core pre-tightening, conical / spherical sealing pairs, and limiting step guidance) to achieve reliable unidirectional shut-off. It has multiple advantages such as rapid response, high sealing performance, stable repeated opening and closing, and controllable cost. At the same time, because there are no electronic components and external pipelines, the system failure rate and the difficulty of sterilization are greatly reduced. It meets the actual clinical needs of high frequency, fast turnover, and strong infection control in digestive endoscopy diagnosis and treatment, and has outstanding practicality, safety, and industrialization promotion value.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a detachable occlusion balloon provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the detachable occlusion balloon during inflation, provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the detachable occlusion balloon after inflation, showing the catheter assembly and valve assembly detached, as provided in an embodiment of the present invention. Figure 4 This is a partially enlarged schematic diagram of a detachable occlusion balloon provided in an embodiment of the present invention; Figure 5 A schematic diagram of a valve core that can be detached from the sealing balloon provided in an embodiment of the present invention; Figure 6 A cross-sectional view of the proximal connector of the detachable occlusion balloon provided in an embodiment of the present invention; Figure 7 A cross-sectional view of the detachable occlusion balloon provided in an embodiment of the present invention, with the annular transition portion abutting the flat end; Figure 8 This is a schematic diagram of the working state of the detachable occlusion balloon when it is inserted into the intestine, as provided in an embodiment of the present invention.

[0028] Icons: 100-Catheter assembly; 110-Synchronous rotating tube; 120-Inner tube; 130-Proximal connector; 131-External threaded tube section; 132-Internal threaded tube section; 133-Annular transition section; 200-Valve assembly; 201-Flat end; 210-Valve seat; 211-Proximal connector; 212-Shell section; 220-Valve core; 221-Needle valve section; 222-Boss section; 223-Spindle section; 230-Sealing ring; 300-Balloon assembly; 310-Balloon catheter; 320-Balloon body; 330-Smooth plug; 340-Distal connector; 400-Elastic element. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used only to describe differences in name and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities in the International System of Units (SI), or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, the detachable occlusion balloon provided in this embodiment of the invention includes: a catheter assembly 100, a valve assembly 200, and a balloon assembly 300; the valve assembly 200 includes a valve seat 210 and a valve core 220 movably connected to the valve seat 210; the catheter assembly 100 and the valve seat 210 are detachably connected; when the catheter assembly 100 and the valve seat 210 are connected, the catheter assembly 100 drives the valve core 220 and opens the inner cavity of the valve seat 210, and the catheter assembly 100 is in fluid communication with the balloon assembly 300 through the inner cavity; when the catheter assembly 100 and the valve seat 210 are detached, the valve core 220 closes the inner cavity.

[0033] The catheter assembly 100 is used to connect to an external infusion device (such as a manual syringe or an electric constant pressure pump), providing a fluid passage and applying axial driving force; the valve assembly 200 is integrated into the proximal end of the balloon and is the core actuator for realizing the "connection opening - disengagement self-sealing" function. The valve assembly 200 includes a rigid valve seat 210 and an elastically responsive valve core 220; the balloon assembly 300 is located at the distal end and includes a flexible balloon body 320 and a balloon catheter 310 integrated with it. The balloon assembly 300 can perform intracavitary occupancy, compression or traction functions. The conduit assembly 100 and the valve seat 210 are connected by a detachable connection method (such as thread or snap). When connected, the distal end of the conduit assembly 100 pushes the valve core 220 to overcome the preload of the elastic element 400, causing it to axially retract, thereby opening the through-hole cavity inside the valve seat 210, allowing fluid to be injected into the balloon assembly 300 through this channel. When the conduit assembly 100 is axially pulled out (detached), the elastic element 400 drives the valve core 220 to quickly reset, and its sealing end face tightly fits against the annular end face of the inner wall of the valve seat 210 to achieve a seal, instantly cutting off the inner cavity and achieving zero-leakage mechanical locking. This process requires no power source, magnet, or temperature-sensitive material, and is completed purely through precision mechanical coordination.

[0034] Furthermore, the valve seat 210 has a proximal connector 211 and a cavity portion 212 connecting the proximal connector 211; the valve core 220 is inserted into the cavity portion 212 from the far end to the near end, passes through the proximal connector 211 and extends out; the inner cavity channel axially passes through the proximal connector 211 and the cavity portion 212.

[0035] The valve seat 210 can be integrally injection molded from medical-grade polyetheretherketone (PEEK), exhibiting excellent dimensional stability, radiation sterilization resistance, and low tissue adhesion. Its structure includes: a proximal connector 211, a cylindrical connector with external threads, for threaded engagement with the proximal connector 130 of the catheter assembly 100; a cavity shell 212: a hollow cylindrical structure extending distally from the proximal connector 211, with annular limiting steps and guide grooves on its inner wall to constrain the movement trajectory of the valve core 220 and prevent rotational deviation; an inner cavity axially penetrating the proximal connector 211 and the cavity shell 212, with its centerline coinciding with the overall axis to ensure low fluid resistance and smooth valve core sliding.

[0036] The valve core 220 can be inserted into the housing portion 212 from the far end to the near end, pass through the proximal connector 211 and extend to the outside. The distal end of the housing portion 212 is connected to the balloon assembly 300, thereby enclosing the valve core 220 inside the housing portion 212.

[0037] Furthermore, the valve core 220 includes a needle valve portion 221 and a boss portion 222 connecting the needle valve portion 221; the needle valve portion 221 passes through the proximal connector 211 and extends outwards, and an elastic element 400 is installed within the cavity portion 212, acting on the boss portion 222 and causing the boss portion 222 to have a tendency to move proximally. The elastic element 400 is a miniature compression coil spring, ensuring that the valve core 220 always has a clear tendency to return to its proximal position when there is no external force. The spring is installed within the cavity portion 212, with one end abutting against the connector for connecting the balloon assembly 300, and the other end pressing against the proximal face of the boss portion 222.

[0038] In addition, the proximal end of the needle valve part 221 is provided with a flat end 201. The cross-sectional shape of the flat end 201, which is perpendicular to the axis of the needle valve part 221, is waist-shaped or rectangular. Its long side dimension is larger than the diameter of the inflation inner tube hole of the conduit assembly 100, and its short side dimension is smaller than the diameter of the inflation inner tube hole, thereby ensuring sufficient flow area when inflation docking.

[0039] Furthermore, a spindle portion 223 is connected to the distal end of the boss portion 222, and the elastic element 400 is sleeved on the spindle portion 223. The spindle portion 223 and the elastic element 400 form a guide mating pair, which effectively suppresses the lateral buckling of the elastic element 400 and ensures the axial straightness of the valve core 220.

[0040] Furthermore, a sealing ring 230 is installed near the proximal end of the boss portion 222, and the sealing ring 230 is fitted onto the needle valve portion 221. The sealing ring 230 can be made of fluororubber (FKM) and is installed on the proximal end face of the boss portion 222. Its inner diameter is slightly smaller than the outer diameter of the needle valve portion 221, forming an interference fit after assembly to ensure initial pre-tightness. When the valve core 220 returns to its original position, the sealing ring 230 is compressed and deformed, filling the micro-gap between the inner wall of the proximal connector 211 and the needle valve portion 221, forming a secondary dynamic seal; at the same time, the proximal end face of the boss portion 222 and the distal annular end face of the proximal connector 211 together press the sealing ring 230 to form a primary hard seal.

[0041] In this embodiment, the proximal connector 211 and the catheter assembly 100 are detachably connected by a threaded connection. A small amount of medical silicone oil can be applied to the threaded connection for lubrication to prevent dryness and jamming after repeated disinfection.

[0042] Further, the catheter assembly 100 includes: a synchronous rotating tube 110, an inner tube 120, and a proximal connector 130; the synchronous rotating tube 110 is fitted over the inner tube 120, the inner tube 120 communicates with the proximal connector 130, and the distal end of the synchronous rotating tube 110 is fixedly connected to the proximal connector 130. The inner tube 120 is made of stainless steel capillary tube with an electrochemically polished inner wall. The synchronous rotating tube 110 is made of polymer-reinforced flexible tubing, fitted over the inner tube 120, and its distal end is heat-fused to the proximal connector 130. Rotating the synchronous rotating tube 110 can drive the inner tube 120 and the proximal connector 130 to rotate synchronously, thereby realizing the disassembly and assembly of the proximal connector 130 and the proximal joint 211.

[0043] like Figure 1 , Figure 4 , Figure 6 and Figure 7 As shown, in this embodiment, the proximal connector 130 includes: an externally threaded tube portion 131, an internally threaded tube portion 132, and an annular transition portion 133 connecting the externally threaded tube portion 131 and the internally threaded tube portion 132; the externally threaded tube portion 131 is fitted to connect to the inner tube 120, and the internally threaded tube portion 132 is fitted to connect to the proximal connector 211; the proximal connector 130 is provided with an inflation inner tube hole that penetrates the externally threaded tube portion 131 and the internally threaded tube portion 132.

[0044] The cross-sectional shape of the air-filled inner tube hole perpendicular to the axis is circular, elliptical, or polygonal.

[0045] During inflation docking, the annular transition portion 133 abuts against the flat end 201. Under the condition that the inflation inner tube hole cannot be completely blocked by the flat end 201, the inflation inner tube hole can retain sufficient flow area, thereby ensuring inflation efficiency.

[0046] Furthermore, the balloon assembly 300 includes: a balloon catheter 310 and a balloon body 320 sleeved outside the balloon catheter 310; the balloon body 320 communicates with the balloon catheter 310, and the proximal end of the balloon catheter 310 is in fluid communication with the internal lumen. The balloon catheter 310 is made of medical-grade polyurethane (PU), and the balloon body 320 may have a double-layer structure, with an inner layer of ultra-thin polyurethane membrane and an outer layer of microporous silicone coating, possessing both high compliance and puncture resistance; it is integrally formed with the balloon catheter 310 by high-frequency thermal welding. The communication port between the balloon body 320 and the balloon catheter 310 is located on the side wall of the balloon catheter 310, and is an elliptical or circular opening, laser-cut and rounded to eliminate sharp edges.

[0047] In an optional embodiment, the distal end of the balloon catheter 310 extends and passes through the balloon body 320, and a smooth plug 330 is installed at the distal end of the balloon catheter 310. The distal end of the balloon catheter 310 extends beyond the balloon body 320, and its end is machined into a hemispherical smooth plug 330 with a burr-free and sharp-angle-free surface. The smooth plug 330 and the balloon catheter 310 can be injection molded using the same mold. This design prevents the distal end of the balloon catheter 310 from scratching the mucosa during intestinal advancement and avoids impingement when the catheter tip enters a narrow intestinal segment.

[0048] like Figure 1 , Figure 4 and Figure 5 As shown, the proximal end of the balloon catheter 310 is connected to the valve seat 210 via a distal connector 340. The distal connector 340 is an injection-molded part made of medical-grade PC material. One end is heat-fused or threaded to the balloon catheter 310, and the other end has an external thread that is screwed tightly to the distal internal thread of the cavity shell 212. Medical-grade UV-curing adhesive is applied to the connection to ensure no leakage or loosening under inflation and deflation pressure cycles. The proximal end of the distal connector 340 is inserted into the valve seat 210 and fixed by threading or bonding. The proximal end of the distal connector 340 abuts against the elastic element 400, thereby pressing the elastic element 400 between the boss 222 and the distal connector 340.

[0049] When inflated, the balloon body 320 has a diameter ranging from 35 mm to 80 mm. This size range covers the anatomical variations of the entire intestinal lumen from the rectum to the ascending colon, making it suitable for intestinal occlusion procedures in adults and children.

[0050] When the balloon body 320 is in the contracted state, the radial dimensions of the catheter assembly 100, valve assembly 200 and balloon assembly 300 are all less than 3.1 mm, so that the catheter assembly 100, valve assembly 200 and balloon assembly 300 can pass through the endoscope channel to reach the affected area. The applicable endoscope channel diameter is 3.2 mm, 3.7 mm or 4.2 mm.

[0051] like Figure 1 , Figure 2 , Figure 3 and Figure 8As shown, when performing ESD (endoscopic submucosal dissection) or endoscopic intestinal resection and anastomosis in the proximal intestine, the proximal intestine must be absolutely cleaned and coated with anti-inflammatory iodine to maintain sterility. If the distal balloon is not properly sealed, the proximal intestine cannot be kept sterile, and endoscopic intestinal anastomosis cannot be performed, because the abdominal cavity is a sterile environment, and the proximal intestine must also be as sterile as possible. During operation, the catheter assembly 100 remains connected to the valve seat 210, and the balloon body 320 remains in a contracted state. The radial dimensions of the catheter assembly 100, valve assembly 200, and balloon assembly 300 are all less than 3.1 mm. The instrument can be inserted through the endoscopic forceps channel with an inner diameter of 3.2 mm until the balloon body 320 reaches the distal end of the resection and anastomosis site. Subsequently, fluid is injected into the balloon assembly 300 through the catheter assembly 100 until the balloon body 320 is inflated to a diameter of 35mm to 80mm (the balloon body 320 is press-fitted into the corresponding intestine), thereby sealing the distal end of the intestinal anastomosis site and preventing backflow of fluid from the distal intestine to the anastomosis site. After the balloon body 320 is inflated, rotating the catheter assembly 100 separates the proximal connector 130 from the proximal connector 211. The elastic element 400 rebounds and drives the valve core 220, thereby completely sealing the gap between the cavity shell 212 and the valve core 220. The valve assembly 200 closes to maintain the inflated state of the balloon body 320. Then, the catheter assembly 100 can be withdrawn from the endoscopic forceps channel, no longer occupying the endoscopic forceps channel, facilitating subsequent surgical procedures using instruments through this channel.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A detachable occlusion balloon, characterized in that, include: The catheter assembly (100), the valve assembly (200), and the balloon assembly (300); The valve assembly (200) includes a valve seat (210) and a valve core (220) movably connected to the valve seat (210). The conduit assembly (100) is detachably connected to the valve seat (210); When the catheter assembly (100) is connected to the valve seat (210), the catheter assembly (100) drives the valve core (220) and opens the inner cavity of the valve seat (210), and the catheter assembly (100) is in fluid communication with the balloon assembly (300) through the inner cavity; With the conduit assembly (100) disengaged from the valve seat (210), the valve core (220) closes the inner cavity.

2. The detachable occlusion balloon according to claim 1, characterized in that, The valve seat (210) has a proximal connector (211) and a cavity portion (212) connecting the proximal connector (211). The valve core (220) is inserted into the cavity housing (212) from the far end to the near end, passes through the proximal end connector (211) and extends out; The inner cavity extends axially through the proximal connector (211) and the cavity shell (212).

3. The detachable occlusion balloon according to claim 2, characterized in that, The valve core (220) includes: a needle valve portion (221) and a boss portion (222) connecting the needle valve portion (221). The needle valve portion (221) passes through the proximal connector (211) and extends outwards, and an elastic element (400) is installed in the cavity housing portion (212) to act on the boss portion (222) and cause the boss portion (222) to have a tendency to move proximally.

4. The detachable occlusion balloon according to claim 3, characterized in that, The needle valve part (221) has a flat end (201) at its proximal end.

5. The detachable occlusion balloon according to claim 3, characterized in that, The distal end of the boss (222) is connected to the spindle (223), and the elastic element (400) is sleeved on the spindle (223).

6. The detachable occlusion balloon according to claim 3, characterized in that, A sealing ring (230) is installed near the protrusion (222), and the sealing ring (230) is sleeved on the needle valve (221).

7. The detachable occlusion balloon according to any one of claims 2 to 5, characterized in that, The proximal connector (211) and the catheter assembly (100) are detachably connected by a threaded connection.

8. The detachable occlusion balloon according to claim 7, characterized in that, The catheter assembly (100) includes: a synchronous rotating tube (110), an inner tube (120), and a proximal connector (130). The synchronous rotating tube (110) is fitted with the inner tube (120), the inner tube (120) is connected to the proximal connector (130), and the distal end of the synchronous rotating tube (110) is fixedly connected to the proximal connector (130).

9. The detachable occlusion balloon according to claim 8, characterized in that, The proximal connector (130) includes: an externally threaded tube portion (131), an internally threaded tube portion (132), and an annular transition portion (133) connecting the externally threaded tube portion (131) and the internally threaded tube portion (132). The external threaded tube section (131) is connected to the inner tube (120), and the internal threaded tube section (132) is connected to the proximal connector (211). The proximal connector (130) is provided with an inflatable inner tube hole that passes through the externally threaded tube section (131) and the internally threaded tube section (132).

10. The detachable occlusion balloon according to claim 9, characterized in that, The cross-sectional shape of the inflatable inner tube hole perpendicular to the axis is circular, elliptical, or polygonal.

11. The detachable occlusion balloon according to claim 1, characterized in that, The balloon assembly (300) includes: a balloon catheter (310) and a balloon body (320) sleeved on the outside of the balloon catheter (310). The balloon body (320) is connected to the balloon catheter (310), and the proximal end of the balloon catheter (310) is in fluid communication with the internal cavity.

12. The detachable occlusion balloon according to claim 11, characterized in that, The distal end of the balloon catheter (310) extends through the balloon body (320), and a smooth plug (330) is installed at the distal end of the balloon catheter (310).

13. The detachable occlusion balloon according to claim 11, characterized in that, The proximal end of the balloon catheter (310) is connected to the valve seat (210) via a distal connector (340).

14. The detachable occlusion balloon according to claim 11, characterized in that, The diameter of the balloon body (320) in the inflated state is 35 mm to 80 mm.

15. The detachable occlusion balloon according to claim 11, characterized in that, In the contracted state of the balloon body (320), the radial dimensions of the catheter assembly (100), the valve assembly (200), and the balloon assembly (300) are all less than 3.1 mm.

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