Urodynamic catheter

Abstract

The invention relates to the technical field of medical instruments, in particular to a urodynamic catheter which comprises a catheter body, the catheter body comprises an outer catheter body and an inner catheter body inserted into the outer catheter body, a gap is formed between the outer catheter body and the inner catheter body, an air bag is arranged on the outer surface of the outer catheter body and close to the tail end, and the air bag is communicated with the interior of the outer catheter body. An inflation nozzle is arranged on the outer surface of the outer pipe body and close to the starting end. The thin steel wire is arranged in the catheter body, the toughness of the catheter body can be enhanced by the thin steel wire during the insertion action, so that the insertion action is facilitated, and after the insertion action is completed, the thin steel wire can be pulled out without influencing the normal use of the catheter.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, in particular to a urodynamic catheter. Background Art

[0002] Urodynamics is based on the principles of fluid mechanics, using electrophysiological methods and sensor technology to study the physiological process of urine storage and urination and its functional disorders. According to the examination method, it is divided into upper tract urodynamics and lower tract urodynamics. Among them, the lower tract urodynamic examination technology has been relatively mature and has become a routine examination item in the clinical work of urology. The contents include free urine flow rate measurement, cystometry (CMG), micturition pressure flow measurement (PQ chart), urethral pressure distribution measurement (UPP), micturition urethral pressure distribution measurement (MUPP), leak point pressure measurement (LPP), external sphincter electrography (EMG), micturition cystourethrography, various synchronous multi-channel measurement techniques, imaging urodynamics and dynamic urodynamics.

[0003] A urodynamic catheter is a medical device used to measure and record bladder pressure, urine flow rate and capacity. When the urodynamic catheter is used, its front end needs to be inserted into the bladder through the patient's urethra, and its end is connected to the corresponding sensor. Through this device, doctors can measure bladder pressure changes, urine flow rate and bladder capacity. However, during the insertion of existing catheters into the urethra, the catheter itself is soft and easily bends and deforms during the insertion process, so it has a certain degree of insertion difficulty; at the same time, some patients may have obstacles such as stones or polyps in their urethra, which further makes the insertion action difficult. To this end, we propose a urodynamic catheter to solve the above-mentioned drawbacks. Summary of the invention

[0004] The object of the present invention is to provide a urodynamic catheter for solving the problems raised in the above-mentioned background technology.

[0005] The present invention is achieved through the following technical solutions:

[0006] A urodynamic catheter comprises a catheter body, wherein the catheter body comprises an outer tube body and an inner tube body inserted into the outer tube body, wherein a gap is provided between the outer tube body and the inner tube body, an air bag is provided on the outer surface of the outer tube body near the end position, the air bag is communicated with the inside of the outer tube body, and an inflation nozzle is provided on the outer surface of the outer tube body near the starting end position;

[0007] It also includes: a thin steel wire, which is movably inserted into the inner tube body from the starting end of the inner tube body;

[0008] A pressure measuring tube, the pressure measuring tube is detachably connected to the starting end of the inner tube body;

[0009] The tube body pushing mechanism comprises a movable cover, the movable cover is cylindrical, a stabilizing tube is provided at one end of the outer side of the movable cover and at the center of the circle, the catheter body moves through the movable cover and the stabilizing tube, sliding openings distributed along the axial direction of the movable cover are provided on opposite sides of the movable cover, a driving rod is provided in the sliding opening, a clamping assembly is provided at the inner end of the driving rod, one end of the two clamping assemblies extends into the stabilizing tube, and the two clamping assemblies are used to clamp the catheter body together.

[0010] Optionally, the tube pushing mechanism includes a driving ring, which is movably sleeved on the outside of the movable cover, and opposite sides of the driving ring are provided with through holes for the driving rod to pass through.

[0011] Optionally, follower blocks are provided on opposite sides of the inner surface of the movable cover and at the positions of the two sliding openings. The follower blocks are connected to the inner wall of the movable cover in an axial sliding manner of the movable cover. A through hole is formed on the follower block for the driving rod to pass through.

[0012] Optionally, a return spring is provided on the outer sleeve of the driving rod, and both ends of the return spring are fixedly connected to the driven block and the clamping assembly respectively; in a natural state, the return spring is in a stretched state, and the top end of the driving rod extends to the outside of the driving ring.

[0013] Optionally, the clamping assembly includes an outer arc plate and an inner arc plate, the cross-sections of the outer arc plate and the inner arc plate are both arc-shaped, the outer arc plate and the inner arc plate are both distributed along the axial direction of the movable cover, the inner surface of the outer arc plate is provided with a slide rail distributed along its own length direction, and the inner arc plate slides in cooperation with the slide rail.

[0014] Optionally, the inner arc plate extends to the outside of the outer arc plate from one end of the straightening tube and is provided with a calibration plate. The drive ring is provided with a calibration port for inserting the calibration plate. The free end of the calibration plate passes through the sliding port and extends into the calibration port.

[0015] Optionally, a mounting plate is provided at one end of the outer arc plate close to the calibration plate, the mounting plate and the corresponding calibration plate are arranged opposite to each other, a pulling spring is connected between the mounting plate and the calibration plate, and the two ends of the pulling spring are respectively fixedly connected to the mounting plate and the calibration plate; in a natural state, the pulling spring is in a stretched state.

[0016] Optionally, a catheter restraint assembly is provided inside the movable cover and on the side away from the straightening tube, and the catheter restraint assembly includes two clamping plates arranged opposite to each other, and guide rods are provided on the opposite back sides of the two clamping plates, and guide holes for the guide rods to pass through are penetrated on the opposite sides of the movable cover, and the length direction of the guide rod is consistent with the length direction of the driving rod.

[0017] Optionally, lever parts are provided on opposite sides of the interior of the movable cover, and the middle part of the lever part is hinged to the inner wall of the movable cover through a hinge seat. A circular hole is penetrated at one end of the lever part, and the guide rod is movably inserted into the corresponding circular hole, and a first blocking plate is provided on the outside of the guide rod and on the upper and lower sides of the lever part.

[0018] Optionally, a through hole is opened at the other end of the lever part, the calibration plate is located on the inner side of the through hole, and a second blocking plate is provided outside the calibration plate and on the upper and lower sides of the lever part; in a natural state, the distance between the two clamping assemblies is greater than the diameter of the catheter body, and the distance between the two clamping plates is smaller than the diameter of the catheter body.

[0019] Compared with the prior art, the present invention provides a urodynamic catheter having the following beneficial effects:

[0020] 1. The catheter body of the present invention has a thin steel wire, which can enhance the toughness of the catheter body during the insertion action, thereby facilitating the insertion action. After the insertion action is completed, the thin steel wire can be pulled out without affecting the normal use of the catheter;

[0021] 2. The front end of the movable cover in the present invention is provided with a straightening tube, which can stretch the front end of the urethra to help insert the catheter into the urethra, and the straightening tube can keep the front end of the urethra upright, thereby further reducing the resistance during the insertion of the catheter;

[0022] 3. The present invention has a calibration sheet. When the catheter body encounters a large resistance during advancement, the calibration sheet can move in the calibration port. The staff can judge the resistance of the catheter during advancement by observing the position of the calibration sheet, thereby facilitating adjustment of the advancement speed and helping to alleviate the pain of the patient.

[0023] 4. When the clamping assembly in the present invention releases the catheter, the two clamping plates can clamp the catheter under the principle of leverage to prevent the clamping assembly from pulling the catheter outward during the pullback action, thereby helping to improve the insertion efficiency of the catheter and also helping to reduce the pain of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a front view of the structure of the present invention;

[0026] Figure 3 It is a cross-sectional view of the tube pushing mechanism of the present invention;

[0027] Figure 4 It is a cross-sectional view of another state of the tube pushing mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the clamping assembly of the present invention;

[0029] Figure 6 for Figure 1 The corresponding figure at A is enlarged;

[0030] Figure 7 for Figure 4 The corresponding figure at B is enlarged;

[0031] Figure 8 It is a schematic diagram of the structure of the lever part of the present invention;

[0032] Fig. 9 for Figure 5 The corresponding figure is enlarged at point C in the middle.

[0033] In the figure: 100, catheter body; 101, outer tube body; 102, inner tube body; 103, airbag; 104, inflation nozzle; 200, thin steel wire; 300, pressure measuring tube; 400, tube body pushing mechanism; 401, movable cover; 402, straightening tube; 403, sliding port; 404, driving rod; 405, clamping assembly; 4051, outer arc plate; 4052, inner arc plate; 4053, slide rail; 406, driving ring; 407, driven block; 408, reset spring; 409, calibration plate; 410, calibration port; 411, mounting plate; 412, pulling spring; 413, clamping plate; 414, guide rod; 415, guide hole; 416, lever part; 417, round hole; 418, penetration port; 419, first blocking plate; 420, second blocking plate. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figure 1 - Figure 7The embodiment of the present application proposes a urodynamic catheter, including a catheter body 100, the catheter body 100 includes an outer tube body 101 and an inner tube body 102 inserted into the outer tube body 101, there is a gap between the outer tube body 101 and the inner tube body 102, an air bag 103 is provided on the outer surface of the outer tube body 101 and near the end position, the air bag 103 is communicated with the interior of the outer tube body 101, an inflation nozzle 104 is provided on the outer surface of the outer tube body 101 and near the starting end position, and a sealing plug is provided at the open end of the inflation nozzle 104; therefore, when it is necessary to inflate the air bag 103, the air bag 103 can be inflated only through the inflation nozzle 104, and after the inflation is completed, the outer tube body 101 can be closed by the sealing plug.

[0036] This embodiment also includes a thin steel wire 200 and a pressure measuring tube 300, wherein the thin steel wire 200 is movably inserted into the inner tube body 102 from the starting end of the inner tube body 102; the function of the thin steel wire 200 is to improve the toughness of the catheter body 100, so as to prevent the catheter body 100 from being easily bent and deformed due to being too soft during insertion into the patient's urethra, that is, the function of the thin steel wire 200 is to facilitate the insertion of the catheter body 100. The pressure measuring tube 300 is detachably connected to the starting end of the inner tube body 102; specifically, during the insertion of the catheter body 100, the pressure measuring tube 300 is separated from the inner tube body 102, and the thin steel wire 200 is inserted into the inner tube body 102; after the insertion is completed, the thin steel wire 200 needs to be pulled out, and then the pressure measuring tube 300 is connected to the inner tube body 102, so that the pressure measuring liquid can be injected into the patient's bladder through the pressure measuring tube 300.

[0037] It should be noted that, in the present embodiment, the starting ends of the inner tube body 102 and the outer tube body 101 are fixedly connected, and the gap between the two is a closed cavity, which can only be inflated and deflated through the inflation nozzle 104; and the end of the outer tube body 101 also has a water outlet, which is connected to the interior of the inner tube body 102 for discharging water, and the water outlet is not connected to the interior of the outer tube body 101, and its function is to prevent gas from leaking from the water outlet; the above-mentioned technical features are well known in the art and will not be repeated here.

[0038] The present embodiment further includes a tube pushing mechanism 400, which includes a movable cover 401, which is cylindrical, and a stabilizing tube 402 is provided at one end of the outer side of the movable cover 401 and at the center of the circle, and the stabilizing tube 402 is consistent with the axial direction of the movable cover 401, and the catheter body 100 moves through the movable cover 401 and the stabilizing tube 402, and the movable cover 401 is provided with sliding openings 403 distributed along its own axial direction on both opposite sides, and a driving rod 404 is provided in the sliding opening 403, and a clamping assembly 405 is provided at the inner end of the driving rod 404, and one end of the two clamping assemblies 405 are both extended into the stabilizing tube 402, and the two clamping assemblies 405 are used to clamp the catheter body 100 together. Since the sliding opening 403 is distributed along the axial direction of the movable cover 401, and the driving rod 404 is inserted into the sliding opening 403, the driving rod 404 and the clamping assembly 405 can only slide left and right along the axial direction of the movable cover 401.

[0039] Furthermore, the tube pushing mechanism 400 includes a driving ring 406, which is movably sleeved on the outside of the movable cover 401, and through holes are provided on opposite sides of the driving ring 406 for the driving rod 404 to pass through. Follower blocks 407 are provided on opposite sides of the inner surface of the movable cover 401 and located at the positions of the two sliding openings 403. The follower blocks 407 are slidably connected to the inner wall of the movable cover 401 along the axial direction of the movable cover 401, and a through hole is provided on the follower blocks 407 for the driving rod 404 to pass through. That is, the outer end of the driving rod 404 passes through the follower block 407 and the driving ring 406 in sequence, and when the operator holds the driving ring 406 and slides it left and right, the clamping assembly 405 can be controlled to move.

[0040] The outer sleeve of the driving rod 404 is provided with a return spring 408, and the two ends of the return spring 408 are respectively fixedly connected to the driven block 407 and the clamping assembly 405; in the natural state, the return spring 408 is in a stretched state, and the top end of the driving rod 404 extends to the outside of the driving ring 406. In the natural state, the distance between the facing ends of the two clamping assemblies 405 is greater than the diameter of the catheter body 100, so that the catheter body 100 can be inserted between the two clamping assemblies 405.

[0041] In some embodiments of the present application, the clamping assembly 405 includes an outer arc plate 4051 and an inner arc plate 4052. The cross-sections of the outer arc plate 4051 and the inner arc plate 4052 are both arc-shaped. The outer arc plate 4051 and the inner arc plate 4052 are both distributed along the axial direction of the movable cover 401. The inner surface of the outer arc plate 4051 is provided with a slide rail 4053 distributed along its length direction. The inner arc plate 4052 is slidably matched with the slide rail 4053, that is, the outer arc plate 4051 and the inner arc plate 4052 can slide relative to each other. The end of the inner arc plate 4052 away from the straightening tube 402 extends to the outside of the outer arc plate 4051 and is provided with a calibration plate 409. The drive ring 406 is provided with a calibration port 410 for inserting the calibration plate 409. The free end of the calibration plate 409 passes through the sliding port 403 and extends into the calibration port 410. An installation piece 411 is provided at one end of the outer arc plate 4051 close to the calibration piece 409. The installation piece 411 and the corresponding calibration piece 409 are arranged opposite to each other. A pulling spring 412 is connected between the installation piece 411 and the calibration piece 409. The two ends of the pulling spring 412 are respectively fixedly connected to the installation piece 411 and the calibration piece 409; in a natural state, the pulling spring 412 is in a stretched state, and the outer end of the calibration piece 409 is in contact with an inner side wall of the calibration port 410.

[0042] During the specific application of this embodiment, in the initial state, the end of the catheter body 100 passes through the movable cover 401 and is located in the righting tube 402, the thin steel wire 200 is inserted into the inner tube body 102, and at this time the clamping assembly 405 is not in close contact with the catheter body 100; when the catheter body 100 needs to be inserted into the patient's urethra, the righting tube 402 is first inserted into the urethra, and then the staff holds the movable cover 401 with one hand and the two driving rods 404 with the other hand, so that the clamping assembly 405 clamps the catheter body 100, and then slowly pushes the driving ring 406 toward one side of the righting tube 402, so that the end of the catheter body 100 gradually extends from the righting tube 402 to the deep part of the urethra.

[0043] When the driving ring 406 moves to the limit position close to the side of the straightening tube 402, the two driving rods 404 are released, and then under the action of the reset spring 408, the two clamping components 405 release the catheter body 100, and then pull the driving ring 406 backward, and then pinch the two driving rods 404 to push forward, and so on, the catheter body 100 can be slowly inserted into the deep urethra of the patient. It is worth mentioning that, in the process of inserting the catheter, if there is a large resistance, since the outer arc plate 4051 and the inner arc plate 4052 are connected by sliding elasticity, the inner arc plate 4052 and the outer arc plate 4051 can be relatively misaligned, so that the calibration plate 409 moves in the calibration port 410, and the staff can judge the resistance of the catheter body 100 when it moves forward by observing the position of the calibration plate 409. When the resistance is large, the forward speed is slowed down, and when the resistance is small, the forward speed can be appropriately increased, thereby reducing the patient's pain as much as possible.

[0044] Example 2: Please refer to Figure 1 - Fig. 9 The embodiment of the present application also provides a urodynamic catheter. The difference between this embodiment and the first embodiment is that a catheter restraint assembly is provided inside the movable cover 401 and on a side away from the righting tube 402. The catheter restraint assembly includes two clamping pieces 413 arranged opposite to each other. The opposite back surfaces of the two clamping pieces 413 are provided with guide rods 414. The opposite sides of the movable cover 401 are penetrated with guide holes 415 for the guide rods 414 to pass through. The length direction of the guide rods 414 is consistent with the length direction of the driving rod 404. Therefore, the two clamping pieces 413 can move relative to each other, thereby clamping or loosening the catheter body 100.

[0045] Furthermore, lever parts 416 are provided on opposite sides of the movable cover 401, and the middle part of the lever part 416 is hingedly provided on the inner wall of the movable cover through a hinge seat, and a round hole 417 is provided through one end of the lever part 416, and the guide rod 414 is movably inserted into the corresponding round hole 417, and a first blocking piece 419 is provided outside the guide rod 414 and on both upper and lower sides of the lever part 416. A through hole 418 is provided at the other end of the lever part 416, and the calibration piece 409 is located inside the through hole 418, and a second blocking piece 420 is provided outside the calibration piece 409 and on both upper and lower sides of the lever part 416; in a natural state, the distance between the two clamping pieces 413 is smaller than the diameter of the catheter body 100.

[0046] In the specific application process of this embodiment, when it is necessary to insert the catheter body 100 into the movable cover 401, in the initial state, the drive ring 406 should be located close to the side of the straightening tube 402, and the two drive rods 404 should be manually pinched. At this time, the spacing between the two clamping pieces 413 is greater than the diameter of the catheter body 100, and then the end of the catheter body 100 is inserted into the movable cover 401 from the end away from the straightening tube 402 until the front end of the catheter body 100 encounters the obstruction of the clamping assembly 405; then the drive rod 404 is released, and the two clamping assemblies 405 are opened under the pulling force of the return spring 408, and under the action of the lever part 416, the two clamping pieces 413 clamp the catheter body 100, and then the drive ring 406 is pulled backwards, so that the two clamping assemblies 405 are respectively located on the opposite sides of the catheter body 100, and finally the two drive rods 404 are pinched and pushed forward to make the catheter body 100 approach the side of the straightening tube 402.

[0047] It is worth mentioning that in the specific implementation process of this embodiment, each time the drive ring 406 is pulled back, the clamping plate 413 temporarily clamps the catheter body 100, thereby making the position of the catheter body 100 more stable and preventing the clamping assembly 405 from pulling back and causing the catheter body 100 to be dragged backward, which further helps to improve the efficiency of catheter insertion and reduce the patient's pain.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A urodynamic catheter, comprising a catheter body (100), characterized in that: The catheter body (100) comprises an outer tube body (101) and an inner tube body (102) inserted into the outer tube body (101), a gap is provided between the outer tube body (101) and the inner tube body (102), an air bag (103) is provided on the outer surface of the outer tube body (101) near the end position, the air bag (103) is communicated with the inside of the outer tube body (101), and an inflation nozzle (104) is provided on the outer surface of the outer tube body (101) near the starting end position; and further comprises: A thin steel wire (200), wherein the thin steel wire (200) is movably inserted into the inner tube body (102) from the starting end of the inner tube body (102); A pressure measuring tube (300), the pressure measuring tube (300) being detachably connected to the starting end of the inner tube body (102); A tube pushing mechanism (400), the tube pushing mechanism (400) comprising a movable cover (401), the movable cover (401) being cylindrical, a stabilizing tube (402) being provided at one end of the outer side of the movable cover (401) and at the center of the circle, the catheter body (100) being movable through the movable cover (401) and the stabilizing tube (402), the movable cover (401) being provided with sliding openings (403) distributed along its own axial direction on opposite sides, a driving rod (404) being provided in the sliding opening (403), a clamping assembly (405) being provided at the inner end of the driving rod (404), one end of each of the two clamping assemblies (405) extending into the stabilizing tube (402), and the two clamping assemblies (405) being used to clamp the catheter body (100) together.

2. A urodynamic catheter according to claim 1, characterized in that: The tube pushing mechanism (400) comprises a driving ring (406) which is movably sleeved on the outside of the movable cover (401). Through holes for the driving rod (404) to pass through are provided on opposite sides of the driving ring (406).

3. A urodynamic catheter according to claim 2, characterized in that: A driven block (407) is provided on opposite sides of the inner surface of the movable cover (401) and at the positions of the two sliding openings (403). The driven block (407) is slidably connected to the inner wall of the movable cover (401) along the axial direction of the movable cover (401), and a through hole is penetrated through the driven block (407) for the driving rod (404) to pass through.

4. A urodynamic catheter according to claim 3, characterized in that: The outer sleeve of the driving rod (404) is provided with a return spring (408), and the two ends of the return spring (408) are respectively fixedly connected to the driven block (407) and the clamping assembly (405); in a natural state, the return spring (408) is in a stretched state, and the top end of the driving rod (404) extends to the outside of the driving ring (406).

5. The urodynamic catheter according to claim 2, characterized in that: The clamping assembly (405) includes an outer arc plate (4051) and an inner arc plate (4052), the cross-sections of the outer arc plate (4051) and the inner arc plate (4052) are both arc-shaped, the outer arc plate (4051) and the inner arc plate (4052) are both distributed along the axial direction of the movable cover (401), the inner surface of the outer arc plate (4051) is provided with a slide rail (4053) distributed along its own length direction, and the inner arc plate (4052) is slidably matched with the slide rail (4053).

6. A urodynamic catheter according to claim 5, characterized in that: The inner arc plate (4052) extends to the outside of the outer arc plate (4051) at one end away from the straightening tube (402) and is provided with a calibration plate (409). The drive ring (406) is provided with a calibration port (410) for inserting the calibration plate (409). The free end of the calibration plate (409) passes through the sliding port (403) and extends into the calibration port (410).

7. A urodynamic catheter according to claim 6, characterized in that: A mounting plate (411) is provided at one end of the outer arc plate (4051) close to the calibration plate (409); the mounting plate (411) and the corresponding calibration plate (409) are arranged opposite to each other; a pulling spring (412) is connected between the mounting plate (411) and the calibration plate (409); and the two ends of the pulling spring (412) are fixedly connected to the mounting plate (411) and the calibration plate (409) respectively; in a natural state, the pulling spring (412) is in a stretched state.

8. A urodynamic catheter according to claim 7, characterized in that: A catheter restraint assembly is provided inside the movable cover (401) and on a side away from the straightening tube (402), and the catheter restraint assembly includes two clamping plates (413) arranged opposite to each other, and guide rods (414) are provided on the opposite back sides of the two clamping plates (413). Guide holes (415) for the guide rods (414) to pass through are provided on opposite sides of the movable cover (401), and the length direction of the guide rods (414) is consistent with the length direction of the driving rod (404).

9. A urodynamic catheter according to claim 8, characterized in that: Lever parts (416) are provided on opposite sides of the interior of the movable cover (401); the middle part of the lever part (416) is hinged to the inner wall of the movable cover through a hinge seat; a round hole (417) is penetrated through one end of the lever part (416); the guide rod (414) is movably inserted into the corresponding round hole (417); and first blocking plates (419) are provided outside the guide rod (414) and on the upper and lower sides of the lever part (416).

10. A urodynamic catheter according to claim 9, characterized in that: A through hole (418) is provided at the other end of the lever portion (416), the calibration plate (409) is located on the inner side of the through hole (418), and a second blocking plate (420) is provided outside the calibration plate (409) and on the upper and lower sides of the lever portion (416); in a natural state, the distance between the two clamping components (405) is greater than the diameter of the catheter body (100), and the distance between the two clamping plates (413) is less than the diameter of the catheter body (100).

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