Balloon type double-cavity micro catheter

Abstract

The balloon type double-cavity micro catheter comprises an outer catheter body and an injection catheter body fixedly connected into the outer catheter body, a guide wire is movably inserted into the injection catheter body in a penetrating mode, the right end of the outer catheter body is communicated and fixed with a balloon which is arranged on the outer side of the injection catheter body in a bonding and sleeving mode, and an injector inserting connector is integrally arranged at the left end of the injection catheter body. The balloon can be continuously inflated and expanded by continuously pinching and pressing the air bag, the air pressure in the balloon can be detected and displayed, automatic blocking and air leakage prevention are facilitated when inflation is stopped, the air pressure of the balloon can be accurately and stably mastered and continuously kept, the use stability is improved, and the safety of the balloon is improved. The detachable pressure-measuring air supply and deflation mechanism is simple in structure, convenient to use, convenient to operate and capable of conveniently and rapidly reducing pressure and deflating air during use or after use by simply moving down the vertical pipe to synchronously release the two plugs for pressure reduction or exhaust, convenient and rapid to operate and convenient to independently disassemble, assemble and recycle the detachable pressure-measuring air supply and deflation mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a balloon-type double-lumen microcatheter. Background Art

[0002] The balloon-type double-lumen microcatheter, also known as the sniper balloon occlusion microcatheter, is used in blood vessels of the peripheral vasculature that require temporary occlusion and provides a vascular selective technology for temporary vessel occlusion for selectively stopping or controlling blood flow. It is also intended to help deliver diagnostic agents such as contrast agents and therapeutic agents into the peripheral vasculature.

[0003] The existing balloon-type double-lumen microcatheter is composed of an outer catheter, an injection hose inserted in the outer catheter, a guide wire inserted inside the injection hose and an air bag connected to the end of the outer catheter. A chamber for inflating the air bag is formed between the outer catheter and the injection hose. The chamber of the injection catheter itself is used to connect a syringe to inject therapeutic agents after the guide wire is withdrawn. (For this method, another example is a detachable multifunctional double-lumen bronchial balloon catheter disclosed in authorization announcement No. CN210728396U, which is composed of a catheter part and an adapter, and the end of the catheter part is detachably connected to the adapter; the catheter part is composed of a double-lumen catheter, an elastic balloon and a closure, and the adapter is composed of a first needle, a second needle, a needle cap, an outer sleeve, a first syringe connector and a second syringe connector; the positions of the first needle and the second needle of the adapter correspond to the two lumens of the double-lumen catheter of the catheter part respectively), one of the two lumens is used to inflate the balloon, and the other is used to inject the agent.

[0004] The existing balloon-type double-lumen microcatheter can be connected to an external air supply tool such as an air cylinder to supply air to the outer catheter to inflate the balloon for blocking and fixing, but there are still some shortcomings: After the balloon is inflated, the pressure cannot be kept stable, and the pressure is difficult to control stably. It is easy to cause air leakage during use, which affects the use effect; 2. The deflation operation is not convenient, and the air supply tool needs to be removed for deflation, which makes the operation cumbersome when the air pressure needs to be lowered during use. Based on the above phenomena, we propose a balloon-type double-lumen microcatheter to solve the above problems. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a balloon-type double-lumen microcatheter.

[0006] The present invention provides a balloon-type double-lumen microcatheter, comprising an outer catheter and an injection catheter fixedly connected to the outer catheter, wherein a guide wire is movably inserted in the injection catheter, the right end of the outer catheter is connected and fixed with a balloon adhesively sleeved on the outside of the injection catheter, the left end of the injection catheter is integrally provided with a syringe plug-in connector, and the top left side of the outer catheter is connected and fixed with an internal thread connector; A detachable pressure measuring and air supply and release mechanism is arranged above the outer conduit, and the detachable pressure measuring and air supply and release mechanism comprises an external threaded sleeve screwed into the internal threaded joint, the top of the external threaded sleeve is connected to and fixed with a fixing box, a partition is arranged on the fixing sleeve in the fixing box, a pressure display is fixedly connected to the bottom right side of the fixing box, a pressure detection end of the pressure display extends into the fixing box and is located below the partition, a conical hole is opened at the bottom of the partition, a conical block is arranged on the sealing movable sleeve in the conical hole, and the arranged pressure display is used to detect and display the air pressure in the part below the partition in the fixing box; A vertical tube is sealed and slidably penetrated on the top inner wall of the fixed box, the left side of the vertical tube is connected to and fixed with an air outlet pipe located in the fixed box, an adhesive sleeve is provided on the vertical tube with an air bag located above the fixed box, the top of the air bag is connected to and fixed with a one-way valve, an elastic guide component fixedly connected to the top of the conical block is sealed and installed in the vertical tube, the elastic guide component is used for vertically guiding and elastically supporting the conical block when it is squeezed downward by air pressure, and is used for automatically driving the conical block to move back to seal and prevent air leakage after the downward air pressure extrusion force disappears; An elastic support component is fixedly connected between the inner walls of both sides of the airbag and the top of the vertical tube, and the elastic support component is used to elastically support the inner side of the airbag, so as to assist the airbag to rebound and reset quickly after being squeezed; An exhaust hole is provided on the top inner wall of the fixed box, and an elastic guide hole blocking component is fixedly connected between the top inner wall of the fixed box and the right side of the vertical pipe. The elastic guide hole blocking component cooperates with the exhaust hole. The elastic guide hole blocking component is used to block the exhaust hole and to release the blockage for automatic exhaust when the vertical pipe is moved downward.

[0007] Preferably, the elastic guide assembly includes a piston, a limit block, a guide rod, a guide sleeve and a first spring, the piston sealing sliding sleeve is arranged in the vertical tube, the bottom of the piston is fixedly connected to the top of the guide rod, the guide sleeve is fixedly installed on the left inner wall of the vertical tube, the guide sleeve sliding sleeve is arranged on the guide rod, the bottom end of the guide rod is fixedly connected to the top of the conical block, the top and bottom ends of the first spring are respectively fixedly connected to the bottom of the piston and the top of the guide sleeve, the first spring movably sleeved on the guide rod, the right side of the limit block is fixedly connected to the right inner wall of the vertical tube, the bottom of the limit block is movably connected to the right side of the top of the piston The piston, limit block, guide rod, guide sleeve and first spring are arranged in cooperation, and the guide rod is used to slide up and down in the guide sleeve to realize vertical guidance of the conical block, and the first spring is used to elastically support the conical block through the piston and the guide rod in sequence. When the air bag is squeezed and the air is supplied to the fixed box through the vertical pipe and the air outlet pipe, the gas squeezes the conical block to move downward to release the blockage, and the gas enters the balloon through the external catheter to expand it. The downward movement of the conical block will drive the piston downward through the guide rod to compress the first spring and store energy, and when the gas stops entering, the elastic force of the first spring is used to drive the conical block to move upward and reset to seal and prevent air leakage.

[0008] Preferably, the elastic support component includes an arc-shaped spring piece and a support piece, the adjacent ends of the two arc-shaped spring pieces are fixedly connected to the top of the vertical tube, the two arc-shaped spring pieces are symmetrically arranged, the repelling ends of the two arc-shaped spring pieces are respectively fixedly connected to the corresponding support pieces, and the repelling sides of the two support pieces are respectively bonded and fixed to the inner walls of both sides of the airbag; the arranged arc-shaped spring pieces and the support pieces cooperate, and when the airbag is squeezed to supply air into the vertical tube, the airbag will be deformed by squeezing the two arc-shaped spring pieces through the two support pieces, and the elastic force of the deformed arc-shaped spring pieces can block the airbag from quickly rebounding and resetting, making it convenient to quickly enter the next squeezing and air supplying action.

[0009] Preferably, the elastic guide hole blocking assembly includes a T-shaped guide rod, a sliding sleeve, a compression spring in a compressed state, a hole blocking plate and a sealing pad, the top end of the T-shaped guide rod is fixedly connected to the top inner wall of the fixed box, the sliding sleeve is slidably mounted on the T-shaped guide rod, the top and bottom ends of the compression spring are respectively fixedly connected to the bottom of the sliding sleeve and the bottom inner wall of the T-shaped guide rod, the compression spring is movably mounted on the T-shaped guide rod, the left side of the sliding sleeve is fixedly connected to the right side of the hole blocking plate, the left side of the hole blocking plate is fixedly connected to the right side of the fixed vertical pipe, the sealing pad is adhesively fixed to the top of the hole blocking plate, and the top of the sealing pad is fixed to the fixed box The top inner wall is in close contact with the top inner wall, and the sealing pad is located at the bottom of the exhaust hole and cooperates with the exhaust hole; the T-shaped guide rod, sliding sleeve, compression spring in compression state, hole blocking plate and sealing pad are arranged to cooperate, and the compression spring is used to realize elastic support of the hole blocking plate and the vertical pipe, and the hole blocking plate and sealing pad are used to realize blocking of the exhaust hole. When the vertical pipe is moved downward, the conical blocking block can be driven downward to release the blockage through the limit block, piston and guide rod in turn, and the hole blocking plate can be directly driven to move downward to release the blockage of the exhaust hole, so as to realize synchronous and convenient release of the two blockages, thereby facilitating convenient and quick exhaust work after use.

[0010] Preferably, the guide wire is located in the syringe plug-in connector, a plurality of supporting rubber blocks are fixedly connected between the inner wall of the outer catheter and the outer side of the injection catheter, an annular chamber is formed between the outer catheter and the injection catheter, and the left end of the outer catheter is set as a blocking structure and is provided with a through hole that is bonded and fixed to the outer side of the injection catheter.

[0011] Preferably, two ventilation holes connected to the interior of the outer catheter are provided on the left inner wall of the balloon.

[0012] Preferably, a sealing ring sleeved on the external thread sleeve is adhesively fixed to the bottom of the fixing box, and the bottom of the sealing ring is in active contact with the top of the internal thread joint.

[0013] Preferably, the bottom of the one-way valve is an outlet.

[0014] Preferably, a circular through hole is opened on the inner wall of the top of the fixing box, and two sealing rubber rings are adhesively sleeved inside the circular through hole, and the inner side of the sealing rubber ring is slidably fitted with the outer side of the vertical pipe.

[0015] Preferably, the piston is located below the air outlet pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the cooperation of the one-way valve, airbag, elastic support component, vertical pipe, fixing box, conical block, conical hole, elastic guide component, air outlet pipe, external catheter, balloon and pressure display, the balloon can be alternately inflated and external gas can be drawn in when the balloon is squeezed continuously, and the conical hole can be automatically blocked when the squeezing stops to prevent the gas filled in the balloon from flowing back and leaking, so as to maintain the gas pressure in the balloon continuously. The pressure in the balloon can be detected and displayed during inflation, so as to facilitate personnel to know and accurately and stably control the gas pressure in the balloon, and improve the stability of use; 2. Through the cooperation of the vertical pipe, elastic support assembly, conical block, elastic guide plugging assembly and exhaust hole, the conical block and the plugging plate can be synchronously driven to move downward when the vertical pipe is moved downward, so that the blockage of the conical hole and the exhaust hole can be synchronously released to reduce pressure or exhaust gas, which is convenient and fast to reduce pressure and deflate gas during or after use according to the use requirements, and the operation is convenient; 3. The assembled and disassembled pressure measuring and air supply and exhaust mechanism is connected to the external conduit through an internal thread joint, so that the assembled and disassembled pressure measuring and air supply and exhaust mechanism can be disassembled and assembled separately for recycling.

[0017] The present invention facilitates continuous inflation of the balloon by continuously squeezing the airbag, can detect and display the gas pressure in the balloon, and is convenient for automatically sealing to prevent air leakage when inflation stops, convenient for accurate and stable control and continuous maintenance of the gas pressure in the balloon, and improves the stability of use, and is convenient for simultaneously releasing the two seals to reduce pressure or exhaust gas by simply moving the vertical pipe downward, thereby facilitating convenient and rapid pressure reduction and deflation during or after use according to use requirements, and is convenient to operate, and convenient for separately disassembling and assembling the assembled pressure measuring and deflation mechanism for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a balloon-type double-lumen microcatheter proposed by the present invention; Figure 2 A schematic cross-sectional view of a balloon-type double-lumen microcatheter proposed by the present invention; Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A; Figure 4 for Figure 3 A schematic diagram of the enlarged structure of part B in FIG. Figure 5 The present invention is a schematic structural diagram of a disassembled pressure measuring and deflation mechanism of a balloon-type double-lumen microcatheter in an unassembled state.

[0019] In the figure: 1. external catheter; 2. injection catheter; 3. balloon; 4. guide wire; 5. syringe plug-in connector; 6. internal thread connector; 7. fixing box; 8. external thread sleeve; 9. partition; 10. tapered hole; 11. tapered block; 12. pressure indicator; 13. vertical pipe; 14. airbag; 15. one-way valve; 16. arc-shaped spring; 17. support plate; 18. guide rod; 19. guide sleeve; 20. piston; 21. first spring; 22. air outlet pipe; 23. exhaust hole; 24. plugging plate; 25. T-shaped guide rod; 26. sliding sleeve; 27. compression spring; 28. sealing rubber pad; 29. ​​sealing rubber ring; 30. limit block. DETAILED DESCRIPTION

[0020] The present invention will be further explained below in conjunction with specific embodiments. Example

[0021] Reference Figure 1-5 The present embodiment proposes a balloon-type double-lumen microcatheter, comprising an outer catheter 1 and an injection catheter 2 fixedly connected to the outer catheter 1, a guide wire 4 movably inserted in the injection catheter 2, the right end of the outer catheter 1 is connected and fixed with a balloon 3 adhesively sleeved on the outside of the injection catheter 2, and two vents connected to the inside of the outer catheter 1 are provided on the left inner wall of the balloon 3, which play the effect of connecting the balloon 3 with the inside of the outer catheter 1, and a syringe plug connector 5 is integrally provided at the left end of the injection catheter 2, and the guide wire 4 is located in the syringe plug connector 5, wherein a plurality of supporting rubber blocks are fixedly connected between the inner wall of the outer catheter 1 and the outside of the injection catheter 2, and an annular chamber is formed between the outer catheter 1 and the injection catheter 2, and the left end of the outer catheter 1 is set as a blocking structure and is provided with a through hole adhesively fixed to the outside of the injection catheter 2, and the inner space of the injection catheter 2 and the annular chamber formed between the outer catheter 1 and the injection catheter 2 are used to play the effect of a double chamber, and the top left side of the outer catheter 1 is connected and fixed with an internal thread connector 6; A detachable pressure measuring and air supply and release mechanism is arranged above the outer conduit 1, and the detachable pressure measuring and air supply and release mechanism comprises an external threaded sleeve 8 which is screwed into the internal threaded joint 6, and the top of the external threaded sleeve 8 is connected and fixed with a fixing box 7, and a sealing ring which is sleeved on the external threaded sleeve 8 is bonded and fixed to the bottom of the fixing box 7, and the bottom of the sealing ring is in active contact with the top of the internal threaded joint 6, so as to seal and prevent air leakage at the top of the internal threaded joint 6 when connected, and a partition 9 is arranged in the fixing sleeve of the fixing box 7, wherein the front side, the rear side, the left side and the right side of the partition 9 are respectively connected with the front side of the fixing box 7, and the sealing ring is arranged on the external threaded sleeve 8, and the sealing ring is arranged on the bottom of the fixing box 7, and the sealing ring is arranged on the upper side of the internal threaded joint 6, so as to seal and prevent air leakage at the upper side of the internal threaded joint 6 when connected, and the fixing sleeve of the fixing box 7 is provided with a partition 9, and the front side, the rear side, the left side and the right side of the partition 9 are respectively connected with the front side of the fixing box 7, and the sealing ring is arranged on the upper side of the internal threaded joint 6 ... The side inner wall, the rear inner wall, the left inner wall and the right inner wall are fixedly installed, and a pressure display 12 is fixedly connected to the right bottom of the fixed box 7. The pressure detection end of the pressure display 12 extends into the fixed box 7 and is located below the partition 9. A conical hole 10 is opened at the bottom of the partition 9. A conical block 11 is provided in the sealing movable sleeve in the conical hole 10, wherein the outer side of the conical block 11 is bonded and coated with a sealing rubber sleeve that is in active contact with the inner wall of the conical hole 10. The pressure display 12 is used to detect the air pressure in the fixed box 7 below the partition 9 and display it; A vertical tube 13 is sealed and slidably penetrated on the top inner wall of the fixed box 7, wherein a circular through-hole is opened on the top inner wall of the fixed box 7, and two sealing rubber rings 29 are adhesively sleeved in the circular through-hole, and the inner side of the sealing rubber ring 29 is slidably fitted with the outer side of the vertical tube 13, so as to achieve the effect of sealing and sliding through of the vertical tube 13, and the left side of the vertical tube 13 is connected and fixed with an air outlet pipe 22 located in the fixed box 7, and an air bag 14 located above the fixed box 7 is adhesively sleeved on the vertical tube 13, and the top of the air bag 14 is connected and fixed with a one-way valve 15, and the bottom of the one-way valve 15 is an outlet, which achieves the effect of one-way air intake, and a sealing valve 15 is installed in the vertical tube 13 that is fixedly connected to the top of the conical block 11 The elastic guide assembly is used to vertically guide and elastically support the conical block 11 when it is squeezed downward by air pressure, and is used to automatically drive the conical block 11 to move back to seal and prevent air leakage after the downward air pressure extrusion force disappears; wherein the elastic guide assembly includes a piston 20, a limit block 30, a guide rod 18, a guide sleeve 19 and a first spring 21, the piston 20 sealing sliding sleeve is arranged in the vertical pipe 13, the piston 20 is located below the air outlet pipe 22, the bottom of the piston 20 is fixedly connected to the top of the guide rod 18, and the guide sleeve 19 is fixedly installed on the left inner wall of the vertical pipe 13, wherein the left side of the guide sleeve 19 is fixedly connected to the left inner wall of the vertical pipe 13 A support rod is connected, and the guide sleeve 19 is fixedly connected to the left inner wall of the vertical tube 13 through the support rod, which plays a supporting effect on the guide sleeve 19. The guide sleeve 19 is slidably sleeved on the guide rod 18, and the bottom end of the guide rod 18 is fixedly connected to the top of the conical block 11. The top and bottom ends of the first spring 21 are respectively fixedly connected to the bottom of the piston 20 and the top of the guide sleeve 19. The first spring 21 is movably sleeved on the guide rod 18, and the right side of the limit block 30 is fixedly connected to the right inner wall of the vertical tube 13, and the bottom of the limit block 30 is movably in contact with the right side of the top of the piston 20; the piston 20, the limit block 30, the guide rod 18, the guide sleeve 19 and the first spring are set 21 cooperates, uses the guide rod 18 to slide up and down in the guide sleeve 19 to realize the vertical guidance of the conical block 11, uses the first spring 21 to elastically support the conical block 11 through the piston 20 and the guide rod 18 in sequence, when the air bag 14 is squeezed and supplied to the fixed box 7 through the vertical pipe 13 and the air outlet pipe 22, when the gas squeezes the conical block 11 to move downward to release the blockage, the gas enters the outer catheter 1 downward, and then enters the balloon 3 to expand it. The downward movement of the conical block 11 will drive the piston 20 downward through the guide rod 18 to compress the first spring 21 to store energy, and when the gas stops entering, the elastic force of the first spring 21 is used to drive the conical block 11 to move upward to reset and seal to prevent air leakage; The inner walls of both sides of the airbag 14 are fixedly connected to the top of the vertical tube 13 with elastic support components, which are used to elastically support the inner side of the airbag 14, and play the effect of assisting the airbag 14 to rebound and reset quickly after being squeezed; the elastic support component includes an arc-shaped spring piece 16 and a support piece 17, and the ends of the two arc-shaped spring pieces 16 that are close to each other are fixedly connected to the top of the vertical tube 13, and the two arc-shaped spring pieces 16 are symmetrically arranged, and the repelling ends of the two arc-shaped spring pieces 16 are respectively fixedly connected to the corresponding support pieces 17, and the repelling sides of the two support pieces 17 are respectively bonded and fixed to the inner walls of the two sides of the airbag 14; the arranged arc-shaped spring pieces 16 and the support pieces 17 cooperate, and when the airbag 14 is squeezed and pressed to supply air to the vertical tube 13, the airbag 14 will be deformed by squeezing the two arc-shaped spring pieces 16 through the two support pieces 17, and the elastic force of the deformed arc-shaped spring pieces 16 can block the airbag 14 from rebounding and resetting quickly, so that it is convenient to quickly enter the next squeezing and air supplying action; An exhaust hole 23 is provided on the top inner wall of the fixed box 7, and an elastic guide plugging hole assembly is fixedly connected between the top inner wall of the fixed box 7 and the right side of the vertical pipe 13. The elastic guide plugging hole assembly cooperates with the exhaust hole 23, and is used to block the exhaust hole 23 and to release the blockage and automatically exhaust the air when the vertical pipe 13 is moved downward; wherein the elastic guide plugging hole assembly includes a T-shaped guide rod 25, a sliding sleeve 26, a compression spring 27 in a compressed state, a plugging hole plate 24 and a sealing rubber pad 28, the top end of the T-shaped guide rod 25 is fixedly connected to the top inner wall of the fixed box 7, and the sliding sleeve 26 is fixedly connected to the top inner wall of the fixed box 7. The sliding sleeve is set on the T-shaped guide rod 25, the top and bottom ends of the compression spring 27 are fixedly connected to the bottom of the sliding sleeve 26 and the bottom inner wall of the T-shaped guide rod 25 respectively, the compression spring 27 is movably set on the T-shaped guide rod 25, the left side of the sliding sleeve 26 is fixedly connected to the right side of the hole blocking plate 24, the left side of the hole blocking plate 24 is fixedly connected to the right side of the fixed vertical pipe 13, the sealing pad 28 is bonded and fixed to the top of the hole blocking plate 24, the top of the sealing pad 28 is in close contact with the top inner wall of the fixed box 7, and the sealing pad 28 is located at the bottom of the exhaust hole 23 and matches the exhaust hole 23; The T-shaped guide rod 25, the sliding sleeve 26, the compression spring 27 in the compressed state, the plugging plate 24 and the sealing rubber pad 28 cooperate, and the compression spring 27 is used to realize the elastic support of the plugging plate 24 and the vertical pipe 13, and the plugging plate 24 and the sealing rubber pad 28 are used to realize the blocking of the exhaust hole 23. When the vertical pipe 13 is moved downward, the conical block 11 can be driven downward to release the blockage through the limit block 30, the piston 20 and the guide rod 18 in sequence, and the plugging plate 24 can be directly driven to move downward to release the blockage of the exhaust hole 23, so as to realize the synchronous and convenient release of the two blockages, so as to facilitate the convenience after use. Quick exhaust operation: This embodiment facilitates continuous inflation of the balloon 3 by continuously squeezing the airbag, can detect and display the gas pressure in the balloon 3, and is convenient for automatically sealing to prevent air leakage when inflation is stopped, so as to facilitate accurate and stable control and continuous maintenance of the gas pressure of the balloon 3, improve the stability of use, and facilitate simultaneous release of the two blockages to reduce pressure or exhaust gas by simply moving the vertical tube 13 downward, so as to facilitate quick and convenient pressure reduction and deflation during or after use according to use needs, and is easy to operate, and is convenient to disassemble and recycle the assembled pressure measuring and deflation mechanism separately.

[0022] In this embodiment, after the proper insertion and the guide wire is pulled out, the syringe connector 5 is connected to the external syringe for injecting medicine. When the balloon 3 is inflated to expand and block, the airbag 14 is continuously squeezed. When the airbag 14 is squeezed, it shrinks inwards and drives the two support sheets 17 to compress the two arc-shaped spring sheets 16. The airbag 14 supplies air to the fixed box 7 through the vertical pipe 13 and the air outlet pipe 22 in turn. The gas entering the fixed box 7 squeezes the conical block 11 downward. Under the squeezing force, the conical block 11 moves downward and drives the piston 20 downward through the guide rod 18 to compress the first spring 21. When the conical block 11 moves downward, it separates from the conical hole 10. At this time, the gas passes downward through the separated space through the external threaded sleeve 8 and the internal threaded sleeve 22 in turn. The threaded joint 6 enters the outer catheter 1 and then enters the balloon 3. As the gas enters downward, the pressure on the conical block 11 disappears. At this time, the elastic force of the first spring 21 in the compressed state drives the conical block 11 to move back upward through the piston 20 and the guide rod 18 in turn to block the conical hole 10, preventing the filled gas from flowing back and leaking outward. When the pinching pressure is released, the two arc-shaped spring pieces 16 in the compressed state assist the airbag 14 to rebound and reset quickly. The rebounded and reset airbag 14 draws external gas into its interior through the one-way valve 15. When the airbag 14 is squeezed again, an inflation and sealing cycle will be performed again. Under the continuous squeezing of the airbag 14, the balloon 3 can be continuously inflated to perform expansion and sealing work, and the operation is convenient. During inflation, after the conical blocking block 11 moves back upward to block, at this time, since the position below the partition 9 in the fixed box 7 is connected to the inside of the balloon 3 through the external catheter 1, the pressure in this part is the same, and the pressure detection end of the pressure display 12 detects the pressure below the partition 9 and displays it. The personnel can accurately control the inflation pressure of the balloon 3 according to the displayed pressure value. After the inflation pressure is appropriate, the squeezing of the airbag 14 can be stopped. After the squeezing stops, the conical blocking block 11 will automatically block the conical hole 10 upward due to the elastic force of the first spring 21, thereby preventing the gas from flowing out and leaking upward, achieving the effect of maintaining a stable pressure in the balloon 3, facilitating accurate and stable control of the gas pressure of the balloon 3, avoiding the phenomenon of back-gassing during use, and improving the stability of use. When the pressure needs to be reduced or the air needs to be deflated during or after use, the airbag 14 is directly moved downward to drive the vertical pipe 13 downward, and the vertical pipe 13 drives the piston 20 downward through the limit block 30, and the piston 20 drives the conical block 11 downward through the guide rod 18 to release the blockage of the conical hole 10. At the same time, the vertical pipe 13 drives the hole blocking plate 24 to move downward synchronously, and the hole blocking plate 24 drives the sliding sleeve 26 to slide downward on the T-shaped guide rod 25 and compress the compression spring 27, and the hole blocking plate 24 drives the sealing rubber pad 28 downward to release the blockage. In addition to blocking the exhaust hole 23, the gas in the balloon 3 flows back to the top of the partition 9 through the tapered hole 10 and then is discharged through the exhaust hole 23. The tapered hole 10 and the exhaust hole 23 can be simultaneously unblocked by simply moving downward. The pressure can be reduced and the air can be deflated quickly during or after use according to the use requirements. The operation is convenient and convenient for personnel to use. After the downward force is relaxed, the elastic force of the compression spring 27 in the compressed state can drive the hole blocking plate 24 and the vertical pipe 13 to move back upward and reset to form a blockage again. The method of connecting the assembled pressure measuring and air supply and exhaust mechanism to the outer conduit 1 through the internal threaded joint 6 facilitates the rotational disassembly and assembly of the assembled pressure measuring and air supply and exhaust mechanism, thereby facilitating the subsequent rotational removal of the assembled pressure measuring and air supply and exhaust mechanism for recycling.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A balloon-type double-lumen microcatheter, comprising an outer catheter (1) and an injection catheter (2) fixedly connected to the outer catheter (1), wherein a guide wire (4) is movably inserted into the injection catheter (2), characterized in that: The right end of the outer catheter (1) is connected to and fixed with a balloon (3) adhesively sleeved on the outside of the injection catheter (2); the left end of the injection catheter (2) is integrally provided with a syringe plug-in connector (5); the top left side of the outer catheter (1) is connected to and fixed with an internal thread connector (6); A detachable pressure measuring and air supply and discharge mechanism is arranged above the outer conduit (1), and the detachable pressure measuring and air supply and discharge mechanism comprises an external threaded sleeve (8) threadedly connected to the internal threaded joint (6), the top of the external threaded sleeve (8) is connected to and fixed with a fixing box (7), a partition (9) is arranged in the fixing sleeve in the fixing box (7), a pressure display (12) is fixedly connected to the bottom right side of the fixing box (7), a pressure detection end of the pressure display (12) extends into the fixing box (7) and is located below the partition (9), a conical hole (10) is opened at the bottom of the partition (9), and a conical blocking block (11) is arranged in the sealing movable sleeve in the conical hole (10); A vertical pipe (13) is sealably and slidably penetrated on the inner wall of the top of the fixed box (7); the left side of the vertical pipe (13) is connected to and fixed with an air outlet pipe (22) located in the fixed box (7); an air bag (14) located above the fixed box (7) is adhesively sleeved on the vertical pipe (13); a one-way valve (15) is connected to and fixed on the top of the air bag (14); and an elastic guide component fixedly connected to the top of the conical block (11) is sealably installed in the vertical pipe (13); An elastic support component is fixedly connected between the inner walls of both sides of the air bag (14) and the top of the vertical pipe (13); An exhaust hole (23) is provided on the top inner wall of the fixed box (7), and an elastic guide hole blocking component is fixedly connected between the top inner wall of the fixed box (7) and the right side of the vertical pipe (13), and the elastic guide hole blocking component cooperates with the exhaust hole (23).

2. A balloon-type double-lumen microcatheter according to claim 1, characterized in that: The elastic guide assembly comprises a piston (20), a stop block (30), a guide rod (18), a guide sleeve (19) and a first spring (21). The piston (20) is sealingly slidably sleeved in the vertical tube (13). The bottom of the piston (20) is fixedly connected to the top of the guide rod (18). The guide sleeve (19) is fixedly mounted on the left inner wall of the vertical tube (13). The guide sleeve (19) is slidably sleeved on the guide rod (18). The bottom end of the guide rod (18) is fixedly connected to the top of the conical block (11). The top and bottom ends of the first spring (21) are respectively fixedly connected to the bottom of the piston (20) and the top of the guide sleeve (19). The first spring (21) is movably sleeved on the guide rod (18). The right side of the stop block (30) is fixedly connected to the right inner wall of the vertical tube (13). The bottom of the stop block (30) is in movably contact with the right side of the top of the piston (20).

3. A balloon-type double-lumen microcatheter according to claim 2, characterized in that: The elastic support assembly comprises an arc-shaped spring sheet (16) and a support sheet (17), the adjacent ends of the two arc-shaped spring sheets (16) are fixedly connected to the top of the vertical tube (13), the two arc-shaped spring sheets (16) are symmetrically arranged, the repelling ends of the two arc-shaped spring sheets (16) are respectively fixedly connected to the corresponding support sheets (17), and the repelling sides of the two support sheets (17) are respectively bonded and fixed to the inner walls of both sides of the airbag (14).

4. A balloon-type double-lumen microcatheter according to claim 3, characterized in that: The elastic guide hole plugging assembly comprises a T-shaped guide rod (25), a sliding sleeve (26), a compression spring (27) in a compressed state, a hole plugging plate (24) and a sealing rubber pad (28), the top end of the T-shaped guide rod (25) is fixedly connected to the top inner wall of the fixed box (7), the sliding sleeve (26) is slidably mounted on the T-shaped guide rod (25), the top end and the bottom end of the compression spring (27) are fixedly connected to the bottom of the sliding sleeve (26) and the bottom inner wall of the T-shaped guide rod (25), respectively, The compression spring (27) is movably sleeved on the T-shaped guide rod (25), the left side of the sliding sleeve (26) is fixedly connected to the right side of the orifice blocking plate (24), the left side of the orifice blocking plate (24) is fixedly connected to the right side of the fixed vertical pipe (13), the sealing pad (28) is adhesively fixed to the top of the orifice blocking plate (24), the top of the sealing pad (28) is in close contact with the top inner wall of the fixed box (7), and the sealing pad (28) is located at the bottom of the exhaust hole (23) and matches the exhaust hole (23).

5. The balloon-type double-lumen microcatheter according to claim 1, characterized in that: The guide wire (4) is located in the syringe plug-in connector (5); a plurality of supporting rubber blocks are fixedly connected between the inner wall of the outer catheter (1) and the outer side of the injection catheter (2); an annular chamber is formed between the outer catheter (1) and the injection catheter (2); the left end of the outer catheter (1) is provided with a blocking structure and is provided with a through hole that is bonded and fixed to the outer side of the injection catheter (2).

6. The balloon-type double-lumen microcatheter according to claim 1, characterized in that: Two ventilation holes connected to the interior of the outer catheter (1) are provided on the left inner wall of the balloon (3).

7. The balloon-type double-lumen microcatheter according to claim 1, characterized in that: A sealing ring sleeved on the external thread sleeve (8) is bonded and fixed to the bottom of the fixing box (7), and the bottom of the sealing ring is in active contact with the top of the internal thread joint (6).

8. The balloon-type double-lumen microcatheter according to claim 1, characterized in that: The bottom of the one-way valve (15) is an outlet.

9. The balloon-type double-lumen microcatheter according to claim 1, characterized in that: A circular through hole is formed on the inner wall of the top of the fixing box (7), and two sealing rubber rings (29) are adhesively sleeved inside the circular through hole, and the inner side of the sealing rubber ring (29) is slidably fitted with the outer side of the vertical pipe (13).

10. The balloon-type double-lumen microcatheter according to claim 2, characterized in that: The piston (20) is located below the air outlet pipe (22).

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