A urodynamic catheter

Abstract

The present invention relates to the field of medical device technology, and specifically to a urodynamic catheter comprising a catheter body, the catheter body comprising an outer tube and an inner tube inserted within the outer tube, a gap being defined between the outer and inner tubes, an airbag being provided on the outer surface of the outer tube near its distal end, the airbag communicating with the interior of the outer tube, and an inflation nozzle being provided on the outer surface of the outer tube near its initial end. The catheter body of the present invention comprises a thin steel wire, which enhances the toughness of the catheter body during insertion, thereby facilitating insertion. Furthermore, the thin steel wire can be removed after insertion is complete without affecting normal use of the catheter.

Description

Technical Field

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

[0002] Urodynamics is a technique based on the principles of fluid dynamics, using electrophysiological methods and sensor technology to study the physiological processes of urine storage and voiding, as well as their functional disorders. Based on the examination method, it is divided into upper tract urodynamics and lower tract urodynamics. Lower tract urodynamics is a relatively mature technique, becoming a routine examination item in urology clinical practice. It includes free urine flow rate measurement, cystometry (CMG), voiding pressure flow rate measurement (PQ-graph), urethral pressure profiling (UPP), voiding urethral pressure profiling (MUPP), leak point pressure measurement (LPP), electrosphincteric urethrography (EMG), voiding cystourethrography, various simultaneous multi-channel examinations, 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, due to the soft texture of the catheter itself, it is easy to bend and deform during the insertion process, so it has a certain degree of insertion difficulty; at the same time, since some patients may have obstructions such as stones or polyps in their urethra, the insertion action is further difficult. To this end, we propose a urodynamic catheter to effectively 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 background technology.

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

[0006] A urodynamic catheter comprises a catheter body, the catheter body comprising an outer tube body and an inner tube body inserted into the outer tube body, a gap being defined between the outer tube body and the inner tube body, an air bag being provided on the outer surface of the outer tube body near the end thereof, the air bag being in communication with the interior of the outer tube body, and an inflation nozzle being provided on the outer surface of the outer tube body near the starting end thereof;

[0007] The inner tube body further comprises a thin steel wire, the thin steel wire being movably inserted into the inner tube body from the starting end thereof;

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

[0009] The tube body pushing mechanism includes a movable cover, which is cylindrical, and 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, and sliding openings distributed along its own axial direction are provided on opposite sides of the movable cover. A driving rod is provided in the sliding opening, and a clamping assembly is provided at the inner end of the driving rod. One end of each 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 two sliding openings. The follower blocks are connected to the inner wall of the movable cover in an axial sliding manner. A through hole is provided on the follower block for the drive rod to pass through.

[0012] Optionally, a return spring is provided on the outside of the driving rod, and the two ends of the return spring are fixedly connected to the driven block and the clamping assembly respectively; in the 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 away 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 fixedly connected to the mounting plate and the calibration plate respectively; in the 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 surfaces of the two clamping plates. Guide holes for the guide rods to pass through are opened on the opposite sides of the movable cover, and the length direction of the guide rods 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 opened through 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 piece is located inside the through hole, and a second blocking piece is provided outside the calibration piece and located on the upper and lower sides of the lever part; in a natural state, the distance between the two clamping components is greater than the diameter of the catheter body, and the distance between the two clamping pieces is less than the diameter of the catheter body.

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

[0020] 1. The catheter body of the present invention has a thin steel wire. Specifically, during the insertion process, the thin steel wire can enhance the toughness of the catheter body, thereby facilitating the insertion process. After the insertion process 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 of the present invention is provided with a centering tube, which can open the front end of the urethra, facilitating the insertion of the catheter into the urethra. The centering tube can also keep the front end of the urethra upright, thereby further reducing the resistance during catheter insertion.

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

[0023] 4. When the clamping assembly of the present invention releases the catheter, the two clamping pieces can clamp the catheter under the principle of leverage, preventing the clamping assembly from pulling the catheter outward during the pull-back action, thereby helping to improve the efficiency of catheter insertion and also helping to reduce the patient's pain. 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 This is a cross-sectional view of the tube pushing mechanism of the present invention;

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

[0028] Figure 5 This 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 point B is enlarged;

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

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

[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, return 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 clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts 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, which includes an outer tube body 101 and an inner tube body 102 inserted into the outer tube body 101, with a gap between the outer tube body 101 and the inner tube body 102, and an air bag 103 is provided on the outer surface of the outer tube body 101 near the end position, and the air bag 103 is communicated with the interior 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 the open end of the inflation nozzle 104 is provided with a sealing plug; therefore, when it is necessary to inflate the air bag 103, it is only necessary to inflate the air bag 103 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 further includes a thin steel wire 200 and a pressure measuring tube 300. The thin steel wire 200 is movably inserted into the inner tube 102 from the starting end of the inner tube 102. The thin steel wire 200 serves to increase the toughness of the catheter body 100 and prevent it from being easily bent and deformed during insertion into the patient's urethra due to its excessive flexibility. In other words, the thin steel wire 200 facilitates the insertion of the catheter body 100. The pressure measuring tube 300 is detachably connected to the starting end of the inner tube 102. Specifically, during the insertion of the catheter body 100, the pressure measuring tube 300 is separated from the inner tube 102, and the thin steel wire 200 is inserted into the inner tube 102. After the insertion is completed, the thin steel wire 200 is removed, and the pressure measuring tube 300 is then reconnected to the inner tube 102. This allows the pressure measuring liquid to be injected into the patient's bladder through the pressure measuring tube 300.

[0037] It should be noted that, in this 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 and is used for water outlet, 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 technical features are all well known in the art and will not be repeated here.

[0038] This embodiment further includes a tube pushing mechanism 400, which includes a movable cover 401. The movable cover 401 is cylindrical, and a centering tube 402 is provided at one end of the outer portion of the movable cover 401, located at the center of the circle. The centering tube 402 is aligned axially with the movable cover 401, and the catheter body 100 is movable through the movable cover 401 and the centering tube 402. Sliding openings 403 are provided on opposite sides of the movable cover 401, extending along its own axis. A drive rod 404 is provided within the sliding openings 403, and a clamping assembly 405 is provided at the inner end of the drive rod 404. One end of each clamping assembly 405 extends into the centering tube 402, and the two clamping assemblies 405 are used to jointly clamp the catheter body 100. Because the sliding openings 403 are arranged axially along the movable cover 401 and the drive rod 404 is inserted into the sliding openings 403, the drive rod 404 and the clamping assembly 405 can only slide left and right along the axis of the movable cover 401.

[0039] Furthermore, the tube pushing mechanism 400 includes a drive ring 406, which is movably mounted on the exterior of the movable cover 401. Opposite sides of the drive ring 406 are provided with through-holes for the drive rod 404 to pass through. Follower blocks 407 are provided on opposite sides of the inner surface of the movable cover 401, 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. The follower blocks 407 are provided with through-holes for the drive rod 404 to pass through. In other words, the outer end of the drive rod 404 passes through the follower blocks 407 and the drive ring 406 in sequence. When an operator holds the drive ring 406 and slides it left and right, the movement of the clamping assembly 405 is controlled.

[0040] A return spring 408 is sheathed around the exterior of the drive rod 404. The two ends of the return spring 408 are fixedly connected to the follower block 407 and the clamping assembly 405, respectively. In its natural state, the return spring 408 is stretched, and the top end of the drive rod 404 extends outside the drive ring 406. Furthermore, in its natural state, the distance between the facing ends of the two clamping assemblies 405 is greater than the diameter of the catheter body 100, allowing the catheter body 100 to 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 outer arc plate 4051 and the inner arc plate 4052 both have arc-shaped cross-sections and are arranged axially along the movable cover 401. The inner surface of the outer arc plate 4051 is provided with a slide rail 4053 extending along its length. The inner arc plate 4052 slidably engages with the slide rail 4053, meaning that the outer arc plate 4051 and the inner arc plate 4052 can slide relative to each other. The inner arc plate 4052 extends from one end of the inner arc plate 4052 away from the centralizing tube 402 to the outside of the outer arc plate 4051 and is provided with a calibration plate 409. A calibration port 410 is formed through the drive ring 406 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 fixedly connected to the installation piece 411 and the calibration piece 409 respectively; in the natural state, the pulling spring 412 is in a stretched state, and the outer end of the calibration piece 409 is in contact with the 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 pinches 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 the 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 drive ring 406 moves to a position close to the side of the straightening tube 402, the two drive rods 404 are released. Under the action of the return spring 408, the two clamping assemblies 405 release the catheter body 100. The drive ring 406 is then pulled back, and the two drive rods 404 are pinched and pushed forward. This reciprocating process allows the catheter body 100 to be slowly inserted deep into the patient's urethra. It is worth mentioning that during the insertion of the catheter, if there is a large resistance, the outer arc plate 4051 and the inner arc plate 4052 are connected by a sliding elastic connection. Therefore, the inner arc plate 4052 and the outer arc plate 4051 can be relatively misaligned, thereby causing the calibration plate 409 to move within the calibration port 410. The staff can judge the resistance of the catheter body 100 by observing the position of the calibration plate 409. If the resistance is large, the forward speed is slowed down. If the resistance is small, the forward speed can be appropriately increased, thereby minimizing the patient's pain.

[0044] Example 2: Please refer to Figure 1 - Figure 9 The present embodiment also provides a urodynamic catheter. This embodiment differs from the first embodiment in that a catheter restraint assembly is provided within the movable cover 401, on a side away from the centralizing tube 402. The catheter restraint assembly includes two opposing clamping plates 413. Guide rods 414 are provided on opposite sides of the clamping plates 413. Guide holes 415 for the guide rods 414 to pass through are formed on opposing sides of the movable cover 401. The length of the guide rods 414 is aligned with the length of the drive rod 404. Therefore, the two clamping plates 413 can move relative to each other, thereby tightening or loosening the catheter body 100.

[0045] Furthermore, lever portions 416 are provided on opposite sides of the interior of the movable cover 401. The middle portion of the lever portion 416 is hingedly mounted on the inner wall of the movable cover via a hinge. A circular hole 417 is formed through one end of the lever portion 416, into which the guide rod 414 is movably inserted. First blocking pieces 419 are provided on the exterior of the guide rod 414, on the upper and lower sides of the lever portion 416. A through-hole 418 is formed at the other end of the lever portion 416, with the calibration piece 409 located inside the through-hole 418. Second blocking pieces 420 are provided on the exterior of the calibration piece 409, on the upper and lower sides of the lever portion 416. In a natural state, the distance between the two clamping pieces 413 is less than the diameter of the catheter body 100.

[0046] When the guide tube 100 is inserted into the movable cover 401, the driving ring 406 should be located close to the side of the straightening tube 402 in the initial state, and the two driving rods 404 should be manually pinched. At this time, the distance between the two clamping pieces 413 is greater than the diameter of the guide tube 100. Then, the end of the guide tube 100 is inserted into the movable cover 401 from the end away from the straightening tube 402 until the front end of the guide tube 100 encounters the obstruction of the clamping assembly 405. Then, the driving rod 404 is released. Under the pulling force of the return spring 408, the two clamping assemblies 405 are opened. Under the action of the lever part 416, the two clamping pieces 413 clamp the guide tube 100. Then, the driving ring 406 is pulled backward so that the two clamping assemblies 405 are located on opposite sides of the guide tube 100. Finally, the two driving rods 404 are pinched and pushed forward to make the guide tube 100 close to the side of the straightening tube 402.

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

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

[0049] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the 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 being provided between the outer tube body (101) and the inner tube body (102), an air bag (103) being provided on the outer surface of the outer tube body (101) near the end position, the air bag (103) being in communication with the interior of the outer tube body (101), and an inflation nozzle (104) being provided on the outer surface of the outer tube body (101) near the starting end position; and further comprising: A thin steel wire (200), wherein the thin steel wire (200) is movably inserted into the interior of 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) includes a movable cover (401), the movable cover (401) is cylindrical, 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, the catheter body (100) moves through the movable cover (401) and the stabilizing tube (402), the movable cover (401) is provided with sliding openings (403) distributed along its own axial direction on opposite sides, a driving rod (404) is provided in the sliding opening (403), a clamping assembly (405) is provided at the inner end of the driving rod (404), one end of each of the two clamping assemblies (405) extends into the stabilizing tube (402), and the two clamping assemblies (405) are used to clamp the catheter body (100) together; The tube pushing mechanism (400) comprises a driving ring (406), the driving ring (406) being movably sleeved on the outside of the movable cover (401), and through holes for the driving rod (404) to pass through are provided on opposite sides of the driving ring (406); 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 in sliding cooperation with the slide rail (4053); The inner arc plate (4052) extends from one end of the centralizing tube (402) to the outside of the outer arc plate (4051) and is provided with a calibration piece (409); the drive ring (406) is provided with a calibration opening (410) for inserting the calibration piece (409); the free end of the calibration piece (409) passes through the sliding opening (403) and extends into the calibration opening (410); A conduit restraint assembly is provided inside the movable cover (401) and on a side away from the straightening tube (402), the conduit restraint assembly comprising two clamping plates (413) arranged opposite to each other, guide rods (414) being provided on opposite 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); Lever parts (416) are provided on opposite sides of the interior of the movable cover (401), and the middle portion of the lever part (416) is hingedly connected to the inner wall of the movable cover via a hinge seat. A circular hole (417) is provided through one end of the lever part (416), and the guide rod (414) is movably inserted into the corresponding circular hole (417). A first blocking piece (419) is provided on the outside of 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 portion (416), the calibration piece (409) is located inside the through-hole (418), and second blocking pieces (420) are provided outside the calibration piece (409) and on both upper and lower sides of the lever portion (416).

2. A urodynamic catheter according to claim 1, 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). A through hole is provided on the driven block (407) for the driving rod (404) to pass through.

3. A urodynamic catheter according to claim 2, 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 fixedly connected to the driven block (407) and the clamping assembly (405) respectively; 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).

4. The urodynamic catheter according to claim 1, 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 relative 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.

5. The urodynamic catheter according to claim 4, characterized in that: In a natural state, the distance between the two clamping assemblies (405) is greater than the diameter of the catheter body (100), and the distance between the two clamping pieces (413) is smaller than the diameter of the catheter body (100).

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