Conduit clamping structure and conduit torsion resistance testing device

Abstract

The utility model belongs to the technical field of medical instruments, and particularly discloses a catheter clamping structure which comprises a first clamp and a second clamp. The pipe inserting clamp is mounted on the first clamp; the adjusting piece is arranged on the intubation clamp and used for adjusting the radial size of the intubation clamp and clamping or loosening the catheter. When the catheter is clamped, the clamping stability of the catheter is improved, and the risk that the catheter falls off from the clamping structure is reduced. Meanwhile, the utility model further discloses a guide pipe torsion resistance testing device, two ends of the guide pipe torsion resistance testing device are provided with the lining cores, concentricity of two ends of the guide pipe can be kept, the guide pipe is supported, measurement accuracy is improved, and the risk that the guide pipe falls off is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a catheter clamping structure and a catheter anti-torsion testing device. Background Technology

[0002] Catheters are an important component in the field of medical devices and are widely used in many medical areas, such as cardiovascular, respiratory, gastrointestinal, and urinary fields. In the cardiovascular field, catheters are inserted into target locations by puncturing blood vessels and can be used for cardiac surgery, diagnosis of heart disease, and delivery of fluids, gases, or drugs into the body for therapeutic purposes.

[0003] During the process of passing through blood vessels, medical staff need to rotate the catheter to make it pass smoothly through tortuous or narrow blood vessels to reach the target location, or to change the position of treatment by rotating the catheter. Therefore, torsional resistance is an important performance parameter of the catheter.

[0004] The torsional resistance of a conduit can be tested using a torsion testing device. Existing torsion testing devices often employ multi-jaw chucks. These devices typically have a first multi-jaw chuck (the force-applying end) and a second multi-jaw chuck (the force-receiving end). The two ends of the conduit are inserted into the clamping holes of the first and second multi-jaw chucks, respectively, to secure it. When the first multi-jaw chuck rotates the conduit by a certain angle, the conduit in the second multi-jaw chuck responds synchronously and rotates accordingly. However, these clamps have the following problems: the conduit is relatively soft, and when subjected to an angular torsional force, the conduit in the second multi-jaw chuck may twist, causing axial movement and detachment. Utility Model Content

[0005] The purpose of this invention is to provide a catheter clamping structure that improves the clamping stability of the catheter and reduces the risk of the catheter falling out of the clamping structure when clamping the catheter.

[0006] The purpose of this utility model is achieved through the following technical solution: a catheter clamping structure is provided, comprising:

[0007] First clamp;

[0008] Insertion clamp, mounted on the first clamp;

[0009] An adjustment element, located on the cannula clamp, is used to adjust the radial dimension of the cannula clamp and to clamp or loosen the catheter.

[0010] Preferably, it also includes a liner; the liner is detachably installed in the first clamp and disposed in the insertion clamp; one end of the catheter is inserted into the liner.

[0011] Preferably, the insertion clamp consists of several elastic clamping pieces, one end of which is mounted on the first clamp; the adjusting component includes a clamp, a first screw, and a nut. The clamp is mounted on the outside of the insertion clamp, and the first screw is inserted into the clamp hole. The clamp is driven by the threaded engagement of the first screw and the nut to adjust the radial dimension of the insertion clamp.

[0012] Preferably, the inner wall of the clip that contacts the catheter is concave arc-shaped.

[0013] Preferably, the insertion clamp is composed of several arc-shaped plates; the adjusting component includes a pressure plate and a second screw. The pressure plate is installed inside the insertion clamp, and the outer side of the pressure plate is connected to the end of the second screw. The other end of the second screw is exposed outside the insertion clamp. The insertion clamp is provided with a threaded hole that mates with the second screw. The pressure plate clamps or releases the tube through the threaded engagement.

[0014] Preferably, the length of the liner is matched with the length of the insertion clamp, and the outer diameter of the liner is matched with the inner diameter of the catheter.

[0015] Due to the adoption of the above technical solution, this utility model has the following advantages: the first clamp is provided with a catheter clamp along the length of the clamping catheter, which increases the clamping length with the catheter, thereby increasing the contact area between the catheter and the clamping assembly and reducing the risk of the catheter falling off due to axial movement caused by twisting.

[0016] Another objective of this invention is to provide a catheter torsion testing device that increases the catheter clamping length during testing, strengthens the concentricity and support strength at both ends of the catheter, reduces the risk of catheter dislodgement, and tests the torsion resistance of the catheter.

[0017] Specifically, a catheter torsion testing device is provided, including a catheter clamping structure, a worktable, and a torsion structure. The torsion structure is slidably mounted on the worktable and connected to the other end of the catheter. It is used to drive the catheter to rotate and detect the torsion angle of the catheter. The catheter clamping structure is also used to measure the torque value of the catheter.

[0018] Preferably, the torsion structure further includes a moving component, which includes a slider, a gear, a rack, and a motor. The rack is fixedly mounted on the worktable, the gear meshes with the rack, the gear is connected to the output end of the motor, the motor is mounted on the slider, and the slider moves along the rack.

[0019] Preferably, the torsion structure further includes an angle sensor mounted on the slider; the conduit clamping structure further includes a torque sensor mounted on the first clamp.

[0020] Preferably, the torsion structure further includes a second clamp, the inner wall of which the clamp head contacts the conduit is convex arc-shaped.

[0021] Due to the adoption of the above technical solution, this utility model has the following advantages: The catheter clamping structure provides stable clamping of the catheter, reducing the risk of the catheter falling off due to axial movement caused by twisting. The liner cores at both ends maintain the concentricity and support strength of the catheter ends, improving measurement accuracy and further reducing the risk of catheter dislodgement. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0023] Figure 1 This is a schematic diagram of a catheter clamping structure according to the present invention;

[0024] Figure 2 This is a schematic diagram of the insertion clamp in Embodiment 1;

[0025] Figure 3 This is a schematic diagram of the insertion clamp in Example 2;

[0026] Figure 4 This is a schematic diagram of a catheter torsion testing device;

[0027] Figure 5 This is an enlarged view of point A;

[0028] Figure 6 This is a schematic diagram of the second clamp.

[0029] Figure label:

[0030] 1-First clamp, 2-Insertion clamp, 21-Clamping piece, 22-Arc-shaped piece, 3-Backing core,

[0031] 4-Adjusting component, 41-Clamping clamp, 42-First screw, 43-Nut, 44-Clamping clamp hole, 45-Pressure plate, 46-Second screw.

[0032] 5-Workbench, 51-Horizontal platform surface, 52-Support frame, 53-Cassette casters

[0033] 6-Torsion structure, 61-Moving component, 611-Slider, 612-Gear, 613-Rack, 614-Motor, 62-Angle sensor, 63-Second clamp.

[0034] 7-Conduit, 8-Torque sensor, 9-Touchscreen controller. Detailed Implementation

[0035] Please see Figure 1 A catheter clamping structure includes: a first clamp 1, a cannula clamp 2, and an adjusting member 4.

[0036] The insertion clamp 2 is mounted on the first clamp 1; the adjusting component 4 is disposed on the insertion clamp 2 and is used to adjust the radial dimension of the insertion clamp 2 to clamp or release the conduit 7. Specifically, the first clamp 1 adopts a multi-jaw chuck chuck of the prior art. The first clamp 1 is equipped with a hydraulic cylinder or a pneumatic cylinder inside. The hydraulic cylinder or pneumatic cylinder drives the chuck to move closer or open, thereby causing the insertion clamp 2 to move closer or open. The insertion clamp 2 extends along the length direction of the conduit 7 and is perpendicular to the end face of the first clamp 1. It is fixedly mounted on the multi-jaw chuck chuck by welding.

[0037] The catheter clamping structure of this invention features an insertion clamp 2 extending from the first clamp 1. In use, the multi-jaw chuck of the first clamp 1 is first opened, and the catheter 7 is inserted into the insertion clamp 2 and the multi-jaw chuck. Then, the multi-jaw chuck is adjusted to bring the multi-jaw chuck closer together, with the inner wall of the insertion clamp 2 abutting against the outer side of the catheter 7. Finally, the adjusting member 4 adjusts the radial dimension of the insertion clamp 2, further clamping the catheter 7. The insertion clamp 2 increases the clamping length of the catheter 7 and the contact area between the catheter 7 and the insertion clamp 2. The adjusting member 4, located on the insertion clamp 2, adjusts the radial dimension of the insertion clamp 2, and further clamps the catheter 7 along its length. This not only increases the clamping force and ensures the stability of the clamped catheter 7 but also prevents the catheter 7 from axially deforming and falling off.

[0038] Furthermore, the catheter clamping structure also includes a liner 3, which is detachably installed in the first clamp 1 and disposed in the insertion clamp 2; one end of the catheter 7 is inserted into the liner 3. Specifically, the multi-jaw chuck has an internal threaded hole in the middle, and one end of the liner 3 has an external thread that mates with the internal thread. The liner 3 can be detachably installed through the threaded engagement. The outer diameter of one end of the liner 3 varies to accommodate catheters 7 with different inner diameters. The catheter 7 is inserted into the outer side of the liner 3. The liner 3 can be made of a material with a certain rigidity, such as stainless steel or other metals, or hard plastics such as POM (polyoxymethylene resin), PS (polystyrene), PMMA (polymethyl methacrylate), etc. In use, the multi-jaw chuck of the first clamp 1 is opened, and a liner 3 with a suitable outer diameter is selected according to the inner diameter of the catheter 7 and installed in the first clamp 1; then the catheter 7 is inserted into the liner 3, and the multi-jaw chuck is adjusted to close, with the inner wall of the insertion clamp 2 abutting against the outer side of the catheter 7. The liner 3 provides support for the clamping part of the catheter 7, which increases the clamping rigidity of the catheter 7 and further reduces the risk of the catheter 7 falling out of the insertion clamp 2.

[0039] Example 1

[0040] Please see Figure 2Furthermore, the insertion clamp 2 is composed of several elastic clamping pieces 21; one end of each clamping piece 21 is mounted on the first clamp 1; the adjusting component 4 includes a clamping ring 41, a first screw 42, and a nut 43. The clamping ring 41 is mounted on the outside of the insertion clamp 2, and the first screw 42 is inserted into the clamping ring hole 44. The clamping ring 41 is driven by the threaded engagement of the first screw 42 and the nut 43 to adjust the radial dimension of the insertion clamp 2. Specifically, the insertion clamp 2 is composed of multiple clamping pieces 21 to clamp the tube. The number of clamping pieces 21 is the same as the number of jaws in the multi-jaw chuck. One end of each clamping piece 21 is welded to the corresponding jaw. Preferably, the clamping piece 21 is perpendicular to the first clamp 1. In use, tightening or loosening the nut 43 changes the inner diameter of the clamping ring 41, thereby clamping or releasing the catheter 7 with the insertion clamp 2. Preferably, multiple adjusting components 4 can be provided along the length of the insertion clamp 2 to increase the clamping force of the insertion clamp 2 on the catheter 7.

[0041] Furthermore, the inner wall of the clip 21 that contacts the catheter 7 is concave arc-shaped. With this structure, the shape of the clip 21 matches the shape of the catheter 7, increasing the contact area and providing a more stable clamping of the catheter 7.

[0042] Example 2

[0043] Please see Figure 3 The difference from Embodiment 1 lies in the adjustment component 4 and the insertion clamp 2. The insertion clamp 2 is composed of several arc-shaped pieces 22. The adjustment component 4 includes a pressure plate 45 and a second screw 46. The pressure plate 45 is installed inside the insertion clamp 2, and its outer side is connected to the end of the second screw 46. The other end of the second screw 46 protrudes from the insertion clamp 2. The insertion clamp 2 has a threaded hole that mates with the second screw 46. Through the threaded engagement, the pressure plate 45 clamps or releases the conduit 7. Specifically, the end of the second screw 46 is fixedly installed on the top outer side of the pressure plate 45 by welding. The length of the pressure plate 45 matches the length of the insertion clamp 2. By screwing in or out the second screw 46, the pressure plate 45 clamps or releases the conduit 7. The arc-shaped pieces 22 are made of rigid tubular pieces, each of which is welded and installed on the claw. Preferably, there are an even number of tubular pieces to facilitate symmetrical installation. Preferably, the adjustment component 4 is provided in two sets, symmetrically arranged about the axis of the insertion clamp 2. Preferably, the pressure plate 45 is a concave arc-shaped plate. With this structure, the shape of the pressure plate 45 matches the shape of the conduit 7, increasing the contact area and clamping the conduit 7 more securely.

[0044] Please see Figure 1 and Figure 2 Furthermore, the length of the liner 3 matches the length of the insertion clamp 2, and the outer diameter of the liner 3 matches the inner diameter of the catheter 7. Preferably, the port of the liner 3 is flush with the port of the insertion clamp 2, which prevents the liner 3 from interfering with the catheter 7 and clamps the catheter 7 from the outside and inside wall, making the catheter 7 less prone to twisting and breakage during testing. To facilitate insertion of the catheter 7 into the liner 3, the outer diameter of the liner 3 is slightly smaller than the inner diameter of the catheter 7.

[0045] Please see Figure 4 A catheter torsion testing device includes a catheter clamping structure, a worktable 5, and a torsion structure 6. The torsion structure 6 is slidably mounted on the worktable 5 and connected to the other end of a catheter 7, used to drive the catheter 7 to rotate and detect the torsion angle experienced by the catheter 7. The catheter clamping structure is also used to measure the torque value of the catheter 7. Specifically, the worktable 5 includes a horizontal platform 51 and multiple support frames 52. To facilitate the movement of the worktable 5, each support frame 52 is equipped with a caster wheel 53 at the ground end. The caster wheel 53 has a braking structure to facilitate fixing the testing device after reaching the desired position. The torsion structure 6 is slidably mounted on the worktable 5 and connected to the other end of the catheter 7 away from the catheter clamping structure. The torsion structure 6 is equipped with a motor, which drives the torsion structure 6 to torsion the experimental angle.

[0046] Please see Figure 5 Furthermore, the torsion structure 6 also includes a moving component 61, which includes a slider 611, a gear 612, a rack 613, and a motor 617. The rack 613 is fixedly mounted on the worktable 5. The gear 612 meshes with the rack 613 and is connected to the output end of the motor 617. The motor 617 is mounted on the slider 611, and the slider 611 moves along the rack 613. Specifically, the rack 613 is fixedly mounted on the worktable 5 by hexagonal bolts. Preferably, the rack 613 is trapezoidal or dovetail-shaped, and the slider 611 has a groove that matches the trapezoidal or dovetail shape. The motor 617 drives the gear 612 to rotate, and the gear 612 meshes with the rack 613. The gear 612 moves along the rack 613 by rotating, changing the distance between the torsion structure 6 and the conduit clamping structure, thereby allowing the measurement of conduits 7 of different lengths.

[0047] Please see Figure 4 Furthermore, the torsion assembly 6 also includes an angle sensor 62, which is mounted on the slider 611; the conduit clamping structure also includes a torque sensor 8, which is mounted on the insertion clamp 2. Specifically, the testing device also includes a touch screen controller 9, which is electrically connected to the angle sensor 62 and the torque sensor 8 via cables, and reads and records the angle and torque values ​​on the touch screen controller 9.

[0048] Please see Figure 4 and Figure 6Furthermore, the torsion structure 6 also includes a second clamp 63, the inner wall of which contacts the conduit 7 is an outwardly convex arc shape. Specifically, the second clamp 63 adopts a multi-jaw chuck clamp of the prior art, which is equipped with a hydraulic cylinder or pneumatic cylinder inside. The hydraulic cylinder or pneumatic cylinder drives the clamp to move closer or open, clamping or releasing the conduit 7. A liner 3 is provided in the second clamp 63, and the installation method is the same as that of the liner 3 in the conduit clamping structure. With this structure, one end of the conduit 7 is clamped in the concave arc shape, and the other end is clamped in the convex arc shape. During torsion testing, the concave arc shape and the convex arc shape cooperate to clamp the conduit 7 more stably.

[0049] The catheter clamping structure and catheter torsion testing device of this invention utilizes a catheter clamp 2 arranged along the length of the catheter 7 in the catheter clamping structure to increase the clamping length of the catheter 7, thereby increasing the contact area between the catheter 7 and the clamping assembly 3. Liners 3 are inserted at both ends of the catheter 7 to provide support, maintaining the concentricity and rigidity of the catheter 7, improving measurement accuracy, and reducing the risk of the catheter 7 falling out of the clamping assembly 3. A convex arc-shaped clamp 63 and a concave arc-shaped clamping plate 21 or pressure plate 45 are provided in the catheter clamping structure. The combination of the concave and convex arc shapes ensures that the catheter 7 is securely clamped in the device, further reducing the risk of the catheter 7 falling out of the clamping assembly 3.

[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific implementation method of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of the spirit of this utility model should be included within the protection scope of this utility model.

Claims

1. A catheter clamping structure, characterized in that, include: First clamp (1); Insertion clamp (2) is installed on the first clamp (1); as well as Adjustment component (4), provided on cannula clamp (2), is used to adjust the radial dimension of cannula clamp (2) and clamp or loosen catheter (7).

2. The catheter clamping structure according to claim 1, characterized in that, It also includes a liner (3), which is detachably installed in the first clamp (1) and set in the insertion clamp (2); one end of the catheter (7) is inserted into the liner (3).

3. The catheter clamping structure according to claim 1 or 2, characterized in that, The insertion clamp (2) consists of several elastic clamping pieces (21); one end of the clamping piece (21) is installed on the first clamp (1); the adjusting part (4) includes a clamp (41), a first screw (42) and a nut (43). The clamp (41) is installed on the outside of the insertion clamp (2), and the first screw (42) is inserted into the clamp hole (44). The clamp (41) is driven by the threaded engagement of the first screw (42) and the nut (43) to adjust the radial dimension of the insertion clamp (2).

4. The catheter clamping structure according to claim 3, characterized in that, The inner wall of the clip (21) that contacts the catheter (7) is concave arc-shaped.

5. The catheter clamping structure according to claim 1 or 2, characterized in that, The insertion clamp (2) is composed of several arc-shaped pieces (22); the adjusting component (4) includes a pressure plate (45) and a second screw (46). The pressure plate (45) is installed inside the insertion clamp (2). The outer side of the pressure plate (45) is connected to the end of the second screw (46). The other end of the second screw (46) is exposed outside the insertion clamp (2). The insertion clamp (2) is provided with a threaded hole that mates with the second screw (46). The pressure plate (45) clamps or releases the conduit (7) through the threaded engagement.

6. The catheter clamping structure according to claim 2 or 4, characterized in that, The length of the liner (3) matches the length of the insertion clamp (2), and the outer diameter of the liner (3) matches the inner diameter of the catheter (7).

7. A device for testing the torsion resistance of a catheter, characterized in that, The catheter clamping structure includes any one of claims 1-6, and further includes a worktable (5) and a torsion structure (6). The torsion structure (6) is slidably mounted on the worktable (5) and connected to the other end of the catheter (7). It is used to drive the catheter (7) to rotate and detect the torsion angle of the catheter (7). The catheter clamping structure is also used to measure the torque value of the catheter (7).

8. The catheter torsion testing device according to claim 7, characterized in that, The torsion structure (6) also includes a moving component (61), which includes a slider (611), a gear (612), a rack (613) and a motor (614). The rack (613) is fixedly mounted on the worktable (5). The gear (612) meshes with the rack (613). The gear (612) is connected to the output end of the motor (614). The motor (614) is mounted on the slider (611), and the slider (611) moves along the rack (613).

9. The catheter torsion testing device according to claim 8, characterized in that, The torsion structure (6) also includes an angle sensor (62), which is mounted on the slider (611); the conduit clamping structure also includes a torque sensor (8), which is mounted on the first clamp (1).

10. The catheter torsion testing device according to any one of claims 7-9, characterized in that, The torsion structure (6) also includes a second clamp (63), the inner wall of which the clamp of the second clamp (63) contacts the conduit (7) is convex arc-shaped.

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