Bending resistance testing tool

Abstract

The utility model aims to provide a bending resistance testing tool suitable for a product with a longer length and a to-be-tested position in the middle, the bending resistance testing tool comprises a clamping mechanism and a counterweight piece, a driving mechanism drives the clamping mechanism to rotate, and the bending resistance testing tool is characterized in that the clamping mechanism comprises an opening-closing type clamping disc, and the counterweight piece is arranged on the opening-closing type clamping disc; the back face of the clamping disc and the base form axial limiting and circumferential rotating fit through the sleeve, and a clamping hole in the middle of the clamping disc is communicated with an inner cavity of the sleeve. The back face of the clamping disc is connected with the base through the sleeve, the sleeve is hollow, so that the guide pipe pump can penetrate through the sleeve, the clamping hole of the clamping disc clamps the periphery of a motor in the middle of the guide pipe pump, the clamping effect is good, and the device is suitable for testing the bending resistance of the guide pipe pump.

Description

Technical Field

[0001] This utility model relates to the field of bending performance testing of medical devices, and specifically designs a bending test fixture. Background Technology

[0002] A catheter pump, a type of ventricular assist device, is introduced into the heart via blood vessels to provide hemodynamic support for patients with cardiogenic shock and acute heart failure. The catheter pump includes a motor, the proximal end of which is connected to an external support device via a catheter. The distal end of the motor shaft is coaxially connected to an impeller. A blood cage is fitted over the impeller, with its proximal end connected to the motor and its distal end connected to a cannula. The motor drives the impeller to rotate, drawing blood from the left ventricle through the distal end of the cannula and pumping it into the aorta through a window in the blood cage. Because the gap between the blood cage and the impeller is small, bending of the blood cage during pumping can severely affect the hemolytic properties of the catheter pump, and in severe cases, can even affect motor rotation, causing shutdown. Therefore, the blood cage requires high bending resistance, and its bending performance must be tested during the manufacturing process. Utility Model Content

[0003] The purpose of this invention is to provide a bending resistance testing fixture suitable for products that are relatively long and whose test position is located in the middle.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a bending resistance testing fixture, including a clamping mechanism and a counterweight, wherein a driving mechanism drives the clamping mechanism to rotate, characterized in that: the clamping mechanism includes an opening and closing clamping disc, the back of the clamping disc is axially limited and circumferentially rotated with the base through a sleeve, and the clamping hole in the middle of the clamping disc communicates with the inner cavity of the sleeve.

[0005] Furthermore, the sleeve includes a main body, the shaft of the main body is arranged in a horizontal plane, the main body passes through the through hole of the base and is axially limited and circumferentially rotated through the bearing, the front end of the main body is provided with a flange, the flange is fixed to the back of the clamping plate, and the main body is connected to the drive mechanism.

[0006] Furthermore, the clamping disc includes a first half-disc and a second half-disc that are rotatably coupled by a hinge shaft. The first half-disc is fixedly connected to a flange by bolts, and the second half-disc is provided with a pull ring indexing pin. The pull ring indexing pin locks or unlocks the clamping disc by engaging with a pin hole opened on the first half-disc.

[0007] Furthermore, a driven pulley is fitted on the rear section of the main body, and the drive mechanism also includes a motor. A driving pulley is coaxially connected to the motor shaft. The axes of the driven pulley and the driving pulley are parallel and both are located in the horizontal plane. The transmission belt is fitted on the outer circumference of the driven pulley and the driving pulley and forms a belt drive system.

[0008] Furthermore, a protective sleeve is provided inside the clamping hole of the clamping disc. The protective sleeve is made of a soft material and has slits along its axial direction.

[0009] Furthermore, the counterweight includes a hanging rope and weights.

[0010] In the above scheme, the back of the clamping plate is connected to the base through a sleeve. Since the inside of the sleeve is hollow, the duct pump can pass through it. The clamping hole of the clamping plate clamps the outer periphery of the motor in the middle of the duct pump, which has a good clamping effect and is suitable for testing the bending performance of the duct pump. Attached Figure Description

[0011] Figure 1 For testing the three-dimensional fixture Figure 1 ;

[0012] Figure 2 For testing the three-dimensional fixture Figure 2 ;

[0013] Figure 3 A cross-sectional view of the test fixture;

[0014] Figure 4 This is a schematic diagram illustrating the usage status of the test fixture;

[0015] Figure 5 This is a cross-sectional view of the clamping disc in use.

[0016] Figure 6 This is a 3D view of the protective case. Detailed Implementation

[0017] The following is combined Figures 1-6 This utility model will be discussed in further detail.

[0018] A bending resistance testing fixture, such as Figure 4 As shown, the device includes a clamping mechanism 10 and a counterweight 20. A driving mechanism 30 drives the clamping mechanism 10 to rotate. The clamping mechanism 10 includes an opening and closing clamping disc 11. The back of the clamping disc 11 is connected to the base 40 via a sleeve 12, forming an axial limiting and circumferential rotational fit. The clamping hole in the middle of the clamping disc 11 communicates with the inner cavity of the sleeve 12. In the above scheme, the back of the clamping disc 11 is connected to the base 40 via the sleeve 12. Since the sleeve 40 is hollow, the duct pump A can pass through it. The clamping hole of the clamping disc 11 clamps the outer periphery of the motor in the middle of the duct pump, resulting in a good clamping effect, which is suitable for testing the bending performance of the duct pump.

[0019] For further details, please refer to [link / reference]. Figure 3The sleeve 12 includes a main body 121, the shaft of which is arranged in a horizontal plane. The main body 121 passes through the through hole of the base 40 and is axially limited and circumferentially rotated through the bearing 41. The front end of the main body 121 is provided with a flange 122, which is fixed to the back of the clamping plate 11. The main body 121 is connected to the drive mechanism 30. The drive mechanism 30 drives the sleeve 12 to rotate, which in turn drives the clamping plate 11 to rotate, causing the tubing pump A clamped on it to rotate to a specific position and lock it. The current position is maintained to test the bending resistance of the tubing pump. After the test is completed, the drive mechanism 30 drives the clamping plate 11 to rotate by a set angle, such as 30°, 60°, 90°, etc., and then tests the bending resistance of the tubing pump A at the next position.

[0020] When catheter pump A is used intracardiaclysinically, flushing fluid needs to be injected into the motor to lower its temperature and ensure its safety. However, as a sterile medical device, catheter pump A must not be flushed during performance testing during the manufacturing process; otherwise, the product would be unusable and cannot be reintroduced into the human body. Therefore, when testing the bending resistance of the catheter pump, the motor has no cooling measures. This necessitates that the entire testing process be as short as possible. A drive mechanism 30 drives the clamping disc 11 to rotate, which is fast and precise, significantly reducing testing time and ensuring that the motor will not be damaged without the cooling effect of flushing fluid.

[0021] To achieve rapid opening and closing of the clamping disc 11, such as Figure 1 As shown, the clamping disc 11 includes a first half-disc 112 and a second half-disc 113 that are rotatably coupled via a hinge shaft 111. The first half-disc 112 is fixedly connected to a flange 122 by bolts. The second half-disc 113 is provided with a pull ring indexing pin 114, which engages with a pin hole on the first half-disc 112 to lock or unlock the clamping disc 11. The pull ring facilitates the rotation of the second half-disc 113 and also facilitates the pulling of the indexing pin, allowing for quick opening and closing of the clamping disc 11 and improving testing efficiency.

[0022] Since the rear end of the sleeve 12 is to be used for the passage of the guide pump A, the drive mechanism 20 cannot be coaxially connected. To solve this problem, a driven pulley 31 is fitted onto the rear section of the main body 121, such as... Figure 2 As shown, the drive mechanism 30 also includes a motor 32. A drive pulley 33 is coaxially connected to the shaft of the motor 32. The driven pulley 31 and the drive pulley 33 have parallel axes and are both located in a horizontal plane. A transmission belt 34 is sleeved on the outer periphery of the driven pulley 31 and the drive pulley 33, forming a belt drive system. The torque of the motor 32 is transmitted to the sleeve 12 through the belt drive system. The two are axially offset and will not affect the arrangement of the guide pump A.

[0023] Some of the motors for the guide pump A are made of epoxy resin and are particularly thin. To prevent damage to the motor housing, a protective sleeve 13 is installed inside the clamping hole of the clamping plate 11. See the structure below. Figure 6 The protective sleeve 13 is made of soft material and has a cut 131 along its axial direction. The cut 131 facilitates the removal and placement of the motor and effectively protects the motor.

[0024] Furthermore, the counterweight 20 includes a hanging rope 21 and a weight 22, and the hanging rope 21 is attached to the blood cage during use.

Claims

1. A bending resistance test fixture comprising a clamping mechanism (10) and a counterweight (20), a drive mechanism (30) driving the clamping mechanism (10) to rotate, characterized in that: The clamping mechanism (10) comprises an open-close clamping disc (11), the back of the clamping disc (11) is axially limited and circumferentially rotatable with the base (40) through a sleeve (12), and the clamping hole in the middle of the clamping disc (11) is communicated with the inner cavity of the sleeve (12).

2. The bend test fixture of claim 1, wherein: The sleeve (12) comprises a main body (121), the shaft core of the main body (121) is arranged in a horizontal plane, the main body (121) passes through the through hole of the base (40) and is axially limited and circumferentially rotatable with the bearing (41), the front end of the main body (121) is provided with a flange (122), the flange (122) is fixed with the back of the clamping disc (11), and the main body (121) is connected with the driving mechanism (30).

3. The bend test fixture of claim 2, wherein: The clamping disc (11) comprises a first half disc (112) and a second half disc (113) which are rotatably connected through a hinge shaft (111), the first half disc (112) is fixedly connected with the flange (122) through a bolt, the second half disc (113) is provided with a pull ring indexing pin (114), and the pull ring indexing pin (114) is locked or unlocked with the clamping disc (11) through cooperation with the pin hole in the first half disc (112).

4. The bend test fixture of claim 2, wherein: The rear section of the main body (121) is sleeved with a driven pulley (31), the driving mechanism (30) further comprises a motor (32), the rotating shaft of the motor (32) is coaxially connected with a driving pulley (33), the driven pulley (31) and the driving pulley (33) are parallel to the axis and are both located in the horizontal plane, and a transmission belt (34) is sleeved on the outer circumferences of the driven pulley (31) and the driving pulley (33) and forms a belt transmission system.

5. The bend test fixture of claim 1, wherein: The clamping hole of the clamping disc (11) is further provided with a protective sleeve (13), the protective sleeve (13) is made of soft material, and a cutout (131) is arranged in the axial direction of the protective sleeve (13).

6. The bend test fixture of claim 1, wherein: The counterweight (20) comprises a hanging rope (21) and a weight (22).

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