Balloon dilatation catheter with thrombus filtering function

Abstract

The balloon dilatation catheter comprises a dilatation catheter body and a pressure pump, a balloon is arranged at the position, close to the front end of the dilatation catheter body, of the outer wall of the dilatation catheter body, and an anti-thrombus filter screen assembly is arranged at the position, close to the rear end of the dilatation catheter body, of the outer wall of the dilatation catheter body. The anti-thrombus filter screen assembly comprises an outer sleeve with an opening in the front end, a fixing tube arranged in the middle of the rear end of the inner wall of the outer sleeve and extending out of the opening end of the outer sleeve, a sliding piece arranged on the outer wall of the fixing tube in a sleeving mode, a plurality of supporting rods rotationally connected to the front end of the sliding piece and filter screens arranged on the inner walls of the supporting rods in a matched mode, and a fixing wing is arranged at the rear end of the dilation catheter body; the rear end of the outer wall of the fixed wing inclines upwards and is outwards provided with a connecting pipe and a guide pipe. According to the utility model, thrombus with different sizes, which falls off due to mechanical thrombus pressing and breaking operations of the dilating catheter, is prevented from flowing along with blood, so that the risk of thromboembolism complications is reduced, and the safety of a patient is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a balloon dilatation catheter with thrombus filtering. Background Art

[0002] Since the beginning of the new century, chronic kidney disease (CKD) has shown a high incidence rate worldwide and has become a global social health public health issue that seriously threatens human health. In particular, the final outcome of most CKD patients is end-stage renal disease (ESRD). In view of the scarcity and severe shortage of kidney transplant donors, most uremic patients rely on maintenance hemodialysis for long-term survival. Once hemodialysis patients develop vascular access stenosis, thromboembolism and other functional disorders, timely surgical intervention is required to maintain the smooth progress of hemodialysis treatment and ensure the patient's quality of life and long-term survival.

[0003] The percutaneous balloon angioplasty (PTA) technique plays a key role in the intervention, treatment and maintenance of vascular access dysfunction. Its advantages are: minimally invasive, simple to operate, with a very high technical success rate and significant clinical effect. It can dilate the target lesions of vascular access stenosis, mechanically compress and break up the thrombus in the vascular cavity, thereby restoring the normal function of the dysfunctional or dysfunctional vascular access.

[0004] However, the existing balloon dilatation catheter and the mechanical compression and fragmentation of thrombi (PTA technology) have the defect that the thrombi in the blood vessels that are directly mechanically crushed by the balloon dilatation catheter are of different sizes. Once the larger thrombi are washed away by the blood flow and cause disabling or fatal thromboembolism, the harm caused to the patients is enormous, and there is a risk of serious or even fatal thromboembolic complications. Utility Model Content

[0005] The purpose of the utility model is to provide a balloon dilatation catheter with thrombus filtering, which prevents thrombi of varying sizes that fall off during the mechanical thrombus compression and thrombus breaking operations of the dilatation catheter from flowing with the blood, thereby reducing and lowering the risk of thromboembolic complications and further ensuring the safety of patients.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A balloon dilatation catheter with thrombus filtering, comprising a dilatation catheter body and a pressure pump, wherein a fixed wing connected thereto is arranged at the rear end of the dilatation catheter body, a fixed groove is provided inwardly on the outer wall of the dilatation catheter body near its front end, a through groove is provided on one side of the rear end of the inner wall of the fixed groove, a connecting pipe connected to the through groove is arranged on one side of the rear end of the outer wall of the fixed wing obliquely upward and outwardly, a balloon connected to the through groove and having elasticity and capable of deformation is arranged in the fixed groove, and an anti-thrombus filter assembly is arranged on the outer wall of the dilatation catheter body near its rear end;

[0008] The anti-thrombosis filter assembly includes an outer sleeve with an opening at the front end, a fixed tube arranged in the middle position of the rear end of the inner wall of the outer sleeve and extending out of its open end, a sliding piece that is sleeved on the outer wall of the fixed tube and slides along the inner wall of the outer sleeve and is sealed and connected thereto, a plurality of fixing buckles arranged at the front end of the sliding piece and distributed at equal intervals, a positioning shaft that rotates in each fixing buckle respectively, an arc-shaped support rod that is respectively arranged on the outer wall of each positioning shaft, a filter net that is cooperated with and is arranged on the inner wall of the support rod and is elastic and deformable, the sliding piece cooperates with the rear end of the inner wall of the outer sleeve to form a sealed cavity, the support rod includes an arc-shaped positioning rod, a spring sheet horizontally arranged at the front end of the positioning rod, the other side of the rear end of the outer wall of the fixed wing is inclined downward and outwardly provided with a catheter that passes through its front end and is connected to the sealed cavity, the connecting pipe and the rear ends of the catheter are respectively connected to the pressure pump and are both detachably connected thereto.

[0009] By adopting the above technical solution, when in use, under the guidance of B-ultrasound, the puncture approach is made from the left elbow cephalic vein to the distal end. After the micropuncture is successful, the vascular sheath is inserted, and the hydrophilic super-slip guide wire is inserted from the vascular sheath to the distal end of the cephalic vein. Then, the dilatation catheter body is introduced into the blood vessel along the hydrophilic super-slip guide wire and reaches the thrombus embolism site of the cephalic vein vascular cavity. The balloon is placed in the thrombus area and covers the entire thrombus. Then, the pressure pump connected to the connecting tube is operated to work, and the volume of the balloon in the fixed groove is changed through the through groove. The balloon is repeatedly expanded to mechanically compress and break the thrombus. At the same time, the pressure pump connected to the catheter is operated to pressurize the sealed cavity through the catheter, so that the slide slides toward the front end of the outer sleeve to push the support rod and the filter out of the front end of the outer sleeve, and the arc-shaped support rod opens outward and cooperates with the filter to form a trumpet shape. Thrombi of varying sizes that are crushed and fallen off by the balloon are washed along the blood flow to the proximal end and enter the anti-thrombus filter and are blocked, preventing thrombus fragments from flowing along the blood.

[0010] The utility model is further configured as follows: the front end of the dilatation catheter body is provided with a dilatation catheter tip which is communicated with the dilatation catheter body and is tapered.

[0011] By adopting the above technical solution, the expansion catheter body is facilitated to move along the hydrophilic super-smooth guide wire.

[0012] The utility model is further configured as follows: torsion springs are arranged between the left and right sides of the outer wall of each positioning shaft and the inner wall of the corresponding fixing buckle.

[0013] By adopting the above technical solution, the support rod can be automatically opened after the restriction of the support rod is released, thereby avoiding the situation where the support rod cannot be opened.

[0014] The utility model is further configured as follows: a limiting ring is arranged at the front end of the outer wall of the fixed tube, and a return spring which is sleeved on the outer wall of the fixed tube is arranged between the limiting ring and the sliding sheet.

[0015] By adopting the above technical solution, the pressure in the sealing cavity can be reduced, and the sliding plate can be quickly pushed back through the cooperation of the return spring to achieve rapid reciprocating motion.

[0016] The utility model is further configured as follows: a front end of the outer wall of the outer sleeve is provided with a plurality of notches corresponding to the support rods one by one.

[0017] By adopting the above technical solution, not only can the support rod be opened quickly, but it can also be prevented from shaking, thus playing a role of limiting and fixing.

[0018] In summary, the utility model has the following beneficial effects:

[0019] First, the utility model can effectively prevent the risk of disabling or fatal thromboembolism caused by mechanical embolism compression and embolism fragmentation by intracavitary balloon dilatation catheter, and can perfectly ensure the safety of patients while ensuring the clinical treatment effect of PTA;

[0020] Secondly, the mechanical compression and crushing of the embolus by the dilatation catheter of the utility model prevents the embolus of varying sizes from flowing with the blood, thereby reducing and lowering the risk of thromboembolic complications and further ensuring the safety of the patient;

[0021] Thirdly, the anti-thrombotic filter assembly of the present invention can not only intercept and collect the detached thrombus and prevent it from flowing with the blood, but also can further repeatedly squeeze and strengthen the thrombus of different sizes entering the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is mainly used to show the position and connection relationship of each component;

[0024] Figure 3 It is a structural schematic diagram of the anti-thrombotic filter assembly of the utility model;

[0025] Figure 4 This is a usage diagram of the balloon and anti-thrombosis filter assembly of the utility model.

[0026] In the figure: 1. dilatation catheter body; 11. dilatation catheter tip; 12. fixed wing; 13. fixed groove; 14. through groove; 15. balloon; 16. connecting tube; 17. anti-thrombotic filter assembly; 18. outer sleeve; 19. fixed tube; 2. slide; 21. fixing buckle; 22. positioning shaft; 23. support rod; 24. filter; 25. positioning rod; 26. spring; 27. torsion spring; 28. limit ring; 29. ​​reset spring; 3. notch; 31. catheter; 32. sealing chamber; 33. booster pump. DETAILED DESCRIPTION

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example, see Figure 1-4A balloon dilatation catheter with thrombus filtering comprises a dilatation catheter body 1 and a pressure pump 33. The front end of the dilatation catheter body 1 is provided with a conical dilatation catheter tip 11 which is connected thereto, and the rear end of the dilatation catheter body 1 is provided with a fixed wing 12 which is connected thereto. A fixed groove 13 is provided inwardly on the outer wall of the dilatation catheter body 1 near its front end, and a through groove 14 is provided on one side of the rear end of the inner wall of the fixed groove 13. A connecting pipe 16 which is connected to the through groove 14 is provided on one side of the rear end of the outer wall of the fixed wing 12 which is inclined upward and outwardly, and a balloon 15 which is connected to the through groove 14 and is elastic and can be deformed is provided in the fixed groove 13, and an anti-thrombus filter assembly 17 is provided on the outer wall of the dilatation catheter body 1 near its rear end.

[0032] The anti-thrombotic filter assembly 17 includes an outer sleeve 18 with an opening at the front end, a fixed tube 19 arranged in the middle position of the rear end of the inner wall of the outer sleeve 18 and extending out of its open end, a slide 2 that is sleeved on the outer wall of the fixed tube 19 and slides along the inner wall of the outer sleeve 18 and is sealed and connected thereto, six fixing buckles 21 arranged at the front end of the slide 2 and distributed at equal intervals around the circumference, a positioning shaft 22 that rotates in each fixing buckle 21, a support rod 23 that is arranged on the outer wall of each positioning shaft 22 and is arc-shaped, and a filter screen 24 that is cooperated with the inner wall of the support rod 23 and is elastic and can be deformed. A sealing cavity 32 is formed between the slide 2 and the rear end of the inner wall of the outer sleeve 18.

[0033] The support rod 23 includes an arc-shaped positioning rod 25 and a spring 26 horizontally arranged at the front end of the positioning rod 25. A torsion spring 27 is arranged between the left and right sides of the outer wall of each positioning shaft 22 and the inner wall of the corresponding fixing buckle 21. A limiting ring 28 is arranged at the front end of the outer wall of the fixed tube 19. A return spring 29 is arranged between the limiting ring 28 and the slide 2 and is sleeved on the outer wall of the fixed tube 19. The front end of the outer wall of the outer sleeve 18 is provided with six notches 3 corresponding to the support rod 23. The other side of the rear end of the outer wall of the fixed wing 12 is inclined downward and outwardly provided with a conduit 31 that passes through its front end and is connected to the sealing chamber 32. The connecting pipe 16 and the rear ends of the conduit 31 are respectively connected to the pressure pump 33 and are both detachably connected to it.

[0034] Usage: The patient lies supine with the left arm abducted and the left upper limb is routinely disinfected. Under the guidance of B-ultrasound, the puncture approach is made from the left elbow cephalic vein to the distal end. After successful micropuncture, the vascular sheath is inserted, and the hydrophilic super-slippery guide wire is inserted from the vascular sheath to the distal end of the cephalic vein. The hydrophilic super-slippery guide wire is manipulated to pass through the thrombus embolism site and pass through the arteriovenous "fistula" anastomosis. Then, the hydrophilic super-slippery guide wire is manipulated to turn to the proximal radial artery, enter the proximal radial artery to the elbow brachial artery and fix the hydrophilic super-slippery guide wire. Under the guidance of the hydrophilic super-slippery guide wire, the dilatation catheter tip 11 and the dilatation catheter body 1 are guided by B-ultrasound to the vascular cavity thrombus embolism site at the proximal end of the "fistula" anastomosis, so that the balloon 15 is located in the thrombus area and covers the entire segment of the thrombus.

[0035] Then, the pressure pump 33 on the fixed wing 12 connected to the connecting tube 16 is started, and the volume of the balloon 15 in the fixed groove 13 is increased through the through groove 14. The thrombus is mechanically compressed and broken by repeated expansion of the balloon 15. At the same time, the corresponding pressure pump 33 connected to the catheter 31 is started. The pressure pump 33 pressurizes the sealing cavity 32 through the catheter 31, so that the slide 2 slides toward the front end of the outer sleeve 18 and compresses the reset spring 29 on the outer wall of the fixed tube 19. The limit ring 28 can limit the reset spring 29 from sliding out of the outer sleeve 18, and the slide 2 pushes the support rod 23 and the filter screen 24 out of the front end of the outer sleeve 18.

[0036] During this process, the support rod 23 extends out of the outer sleeve 18 and gradually releases the restriction. The positioning shaft 22 in the fixing buckle 21 gradually opens under the reset state of the torsion spring 27 and stretches the filter screen 24. The slot 3 can limit the support rod 23 to a certain extent while resisting the blood flow rate to prevent it from shaking. After it is fully opened, the spring piece 26 on the positioning rod 25 is horizontally arranged and cooperates with the filter screen 24 to form a trumpet shape. The thrombi of varying sizes that are crushed and detached by the balloon 15 are washed along the blood flow to the proximal end and enter the filter screen 24 and are blocked, preventing the thrombus fragments from flowing along the blood. The thrombus in the filter screen 24 can also be further broken up by restoring the slide 2 to its initial state.

[0037] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A balloon dilatation catheter with thrombus filtering, comprising a dilatation catheter body (1) and a pressure pump (33), characterized in that: The rear end of the dilatation catheter body (1) is provided with a fixed wing (12) in communication with the dilatation catheter body (1); a fixed groove (13) is provided inwardly on the outer wall of the dilatation catheter body (1) near the front end thereof; a through groove (14) is provided on one side of the rear end of the inner wall of the fixed groove (13); a connecting pipe (16) in communication with the through groove (14) is provided on one side of the rear end of the outer wall of the fixed wing (12) inclining upward and outwardly; a balloon (15) in communication with the through groove (14) and having elasticity and being capable of deformation is provided in the fixed groove (13); an anti-thrombotic filter assembly (17) is provided on the outer wall of the dilatation catheter body (1) near the rear end thereof; The anti-thrombotic filter assembly (17) comprises an outer sleeve (18) with an opening at the front end, a fixing tube (19) arranged at the middle position of the rear end of the inner wall of the outer sleeve (18) and extending out of the opening end thereof, a sliding sheet (2) which is sleeved on the outer wall of the fixing tube (19) and slides along the inner wall of the outer sleeve (18) and is sealedly connected thereto, a plurality of fixing buckles (21) arranged at the front end of the sliding sheet (2) and distributed at equal intervals, a positioning shaft (22) which rotates in each fixing buckle (21), a supporting rod (23) which is arranged on the outer wall of each positioning shaft (22) and is in an arc shape, and a supporting rod (23) which is arranged in cooperation with the supporting rod (23). The outer wall of the fixed wing (12) is provided with a filter screen (24) which is elastic and can be deformed, the slide (2) cooperates with the rear end of the inner wall of the outer sleeve (18) to form a sealed cavity (32), the support rod (23) comprises a positioning rod (25) arranged in an arc shape, and a spring sheet (26) arranged horizontally at the front end of the positioning rod (25), the other side of the rear end of the outer wall of the fixed wing (12) is inclined downward and outwardly provided with a conduit (31) passing through its front end and communicating with the sealed cavity (32), the connecting pipe (16) and the rear ends of the conduit (31) are respectively communicated with the pressure pump (33) and are both detachably connected thereto.

2. A balloon dilatation catheter with thrombus filtration according to claim 1, characterized in that: The front end of the dilatation catheter body (1) is provided with a dilatation catheter tip (11) which is connected thereto and is tapered.

3. The balloon dilatation catheter with thrombus filtering according to claim 1, characterized in that: Torsion springs (27) are arranged between the left and right sides of the outer wall of each positioning shaft (22) and the inner wall of the corresponding fixing buckle (21).

4. The balloon dilatation catheter with thrombus filtering according to claim 1, characterized in that: A limit ring (28) is provided at the front end of the outer wall of the fixed tube (19), and a return spring (29) which is sheathed on the outer wall of the fixed tube (19) is provided between the limit ring (28) and the slide plate (2).

5. The balloon dilatation catheter with thrombus filtering according to claim 1, characterized in that: A plurality of notches (3) corresponding one-to-one to the support rods (23) are formed inwardly at the front end of the outer wall of the outer sleeve (18).

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