Synchronous tension, compression and torsion fatigue test device for vascular stent

Abstract

A synchronous tension, compression and torsion fatigue test device for a vascular stent is provided, comprising: a reciprocating connection disk connected to the output shaft of a linear motor and comprising a disk body and a plurality of claws arranged along the outer periphery of the disk body, wherein the connection disk can reciprocate in a first direction; a plurality of load sensors correspondingly arranged on the plurality of claws; and a synchronous rotation device. The device can synchronously implement tension, compression and torsion fatigue performance tests of a plurality of vascular stents. During the test, the height of the load sensor and the angular position of the claws can be adjusted to adapt to vascular stents of different lengths.

Description

Technical Field

[0001] The invention relates to the field of testing, and in particular to a synchronous tension, compression and torsion fatigue testing device for a vascular stent. Background Art

[0002] With the development of the economy and the improvement of living standards, the incidence of vascular diseases is also increasing. Currently, the most effective way to treat vascular diseases is to implant vascular stents into the human body. However, due to the different movement patterns of various parts of the human body, vascular stents will be subject to complex loads. Therefore, it is particularly important to judge the service life of vascular stents. For example, the twisting of a person's head in life, the bending of the legs when walking and exercising, and the stress on the renal artery caused by breathing will affect the life of the vascular stent. In this regard, how to simulate the tensile, compressive and torsional fatigue performance of the relevant vascular stents in vitro and predict the service life of the vascular stents in the human body through simulation test results is an urgent problem to be solved.

[0003] Therefore, it is necessary to study a synchronous tension, compression and torsion fatigue testing device for a vascular stent to solve one or more of the above-mentioned technical problems. Summary of the invention

[0004] In order to solve at least one of the above technical problems, according to one aspect of the present invention, a synchronous tension, compression and torsion fatigue testing device for a vascular stent is provided, which can perform synchronous testing on multiple groups of vascular stents, thereby improving the testing efficiency. At the same time, it can provide consistent simulated loads and simulated environments for multiple groups of stents, thereby facilitating obtaining effective test results.

[0005] Specifically, a synchronous tension, compression and torsion fatigue testing device for a vascular stent is provided, which is characterized by comprising:

[0006] A reciprocating connection disk connected to the output shaft of the linear motor and comprising a disk body and a plurality of claws arranged along the outer periphery of the disk body, wherein the connection disk can reciprocate in a first direction;

[0007] A plurality of load sensors are correspondingly disposed on the plurality of claws; and

[0008] A synchronous rotating device comprises: a plurality of rotating shafts, which are arranged corresponding to the plurality of load sensors, and a vascular stent arranged along a second direction is detachably installed between the rotating shafts and the load sensors, and the second direction is parallel to the first direction; a plurality of bearing seats, which connect the plurality of rotating shafts; a plurality of rotating shaft synchronous wheels, which are connected to the plurality of rotating shafts; a slave synchronous wheel, which is connected to one of the rotating shafts; a main synchronous wheel, which is connected to the output shaft of the power device and to the slave synchronous wheel; and a slave synchronous belt, which connects the plurality of rotating shaft synchronous wheels.

[0009] According to another aspect of the present invention, the synchronous tension, compression and torsion fatigue testing device for a vascular stent further comprises a temperature regulating chamber for accommodating the connecting plate, a plurality of load sensors and the synchronous rotation device.

[0010] According to another aspect of the present invention, the output shaft of the linear motor is connected to the connecting disk through an extension rod and a connecting unit, the connecting unit includes a fixed disk and a hollow cylinder arranged in the center of the fixed disk, the output shaft of the linear motor is connected to the extension rod, the extension rod is threadedly connected to the hollow cylinder, and the fixed disk is connected to the connecting disk.

[0011] According to another aspect of the present invention, the synchronous tension, compression and torsion fatigue testing device for the vascular stent further includes a load sensor height adjustment unit and a claw angle position fine-tuning unit.

[0012] According to another aspect of the present invention, the load sensor height adjustment unit includes: an adjusting nut, which is arranged corresponding to the load sensor and arranged between the support claw and the clamping member provided on the support claw; and an adjusting screw, a first end of which is connected to the load sensor, and a second end of which passes through a first through hole provided on the support claw, a through hole of the adjusting nut and a second through hole provided on the clamping member in sequence, and the adjusting screw is threadedly connected to the adjusting nut.

[0013] According to another aspect of the present invention, the clamping member includes a horizontal portion and a vertical portion, the adjusting nut is located between the horizontal portion and the supporting claw, and the vertical portion is connected to the horizontal portion and the supporting claw respectively.

[0014] According to another aspect of the present invention, the claw angle position fine-tuning unit includes: a plurality of waist-shaped countersunk holes provided on the disk body; and a connecting member provided in the waist-shaped countersunk holes, and the disk body is fixedly connected to the fixed disk via the connecting member.

[0015] According to another aspect of the present invention, the synchronous tension, compression and torsion fatigue testing device for the vascular stent also includes: a coupling connected to the main synchronous wheel; a connecting shaft connected to the coupling; and a bearing unit connected to the connecting shaft, and the output shaft of the power device is connected to the connecting shaft.

[0016] According to yet another aspect of the present invention, the synchronous rotation device is provided with a heat dissipation fan.

[0017] According to another aspect of the present invention, a waterproof sealing ring is provided between the bearing seat and the rotating shaft, and the temperature regulating cabin includes a transparent organic glass cabin body, a heating module, a temperature sensor, a bottom mounting plate and a controller.

[0018] The present invention can achieve one or more of the following technical effects:

[0019] 1. Perform synchronous tension, compression and torsion tests on multiple groups of brackets to improve test efficiency.

[0020] 2. Consistent simulated loads and simulated environments can be provided for multiple groups of brackets, and the test results of each bracket are comparable, which is conducive to obtaining effective test results.

[0021] 3. The synchronous belt transmission structure is adopted. This structure realizes transmission by meshing the synchronous belt teeth with the synchronous belt wheel teeth. There is no relative sliding between the two, and the circumferential speed is synchronized. Compared with the gear transmission, the synchronous belt structure can buffer the transmission impact and vibration, has the characteristics of low transmission noise, and does not require lubrication and is easy to maintain. It can meet the requirements of high-speed operation and high-frequency reversing, and it has fewer transmission parts, and only a small space is required to complete the transmission system.

[0022] 4. The diameter of the main synchronous wheel is larger than that of the rotating synchronous wheel, which increases the transmission ratio. When the main shaft rotates at a certain angle, the rotating shaft will rotate at a greater angle. According to the characteristics of the rotating servo motor, under the condition that the reciprocating angle of the rotating shaft is fixed, the upper limit of its operating frequency can be effectively increased.

[0023] 5. The rotating shaft is connected to the rotating synchronous wheel through the bearing seat. The bearing support seat can provide the rotating shaft with high rigidity and high-precision rotation performance to ensure that the rotating shaft will not be deformed due to continuous bending moment (centripetal force) during long-term reciprocating motion, resulting in system failure. A lip-shaped rotating seal is installed between the rotating shaft and the mounting hole, and a rubber seal waterproof layer is added on the outside to ensure effective sealing while the rotating shaft rotates to prevent liquid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Figure 1 It is a schematic structural diagram of a synchronous tension, compression and torsion fatigue testing device for a vascular stent according to a preferred embodiment of the present invention.

[0026] Figure 2 It is a structural schematic diagram of a synchronous tension-compression device (including a reciprocating connection plate and a plurality of load sensors) of a synchronous tension-compression-torsion fatigue testing device for a vascular stent according to a preferred embodiment of the present invention.

[0027] Figure 3 It is a schematic diagram of a synchronous rotation device of a synchronous tension, compression and torsion fatigue testing device for a vascular stent according to a preferred embodiment of the present invention.

[0028] Figure 4 for Figure 3 Schematic diagram of the internal structure of the synchronous rotating device.

[0029] Figure 5 This is a schematic diagram of a temperature regulating chamber of a vascular stent synchronous tension, compression and torsion fatigue testing device according to a preferred embodiment of the present invention.

[0030] Figure 6 It is a schematic structural diagram of a reciprocating connecting disk of a synchronous tension, compression and torsion fatigue testing device for a vascular stent according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0031] The best implementation mode of the present invention is described below through preferred embodiments in conjunction with the accompanying drawings. The specific implementation mode here is to illustrate the present invention in detail and should not be understood as limiting the present invention. Various deformations and modifications can be made without departing from the spirit and essential scope of the present invention, which should be included in the protection scope of the present invention. Example

[0032] According to a preferred embodiment of the present invention, see Figure 1-6 , provides a synchronous tension, compression and torsion fatigue testing device for a vascular stent, which is characterized by comprising:

[0033] A reciprocating connection disk 10 is connected to the output shaft 2 of the linear motor 1 and comprises a disk body 101 and a plurality of claws 102 arranged along the outer periphery of the disk body, and the connection disk 10 can reciprocate in a first direction;

[0034] A plurality of load sensors are correspondingly disposed on the plurality of claws; and

[0035] The synchronous rotating device 5 includes: a plurality of rotating shafts 13, which are arranged corresponding to the plurality of load sensors, and a vascular stent arranged along a second direction is detachably installed between the rotating shafts 13 and the load sensors, and the second direction is parallel to the first direction; a plurality of bearing seats 14, connecting the plurality of rotating shafts 13; a plurality of rotating shaft 13 synchronous wheels 19, connected to the plurality of rotating shafts 13; a slave synchronous wheel 18, connected to one of the rotating shafts 13; a main synchronous wheel 17, connected to the output shaft of the power device and to the slave synchronous wheel 18; and a slave synchronous belt 21, connecting the plurality of rotating shafts 13 synchronous wheels 19.

[0036] According to another preferred embodiment of the present invention, the synchronous tension, compression and torsion fatigue testing device for the vascular stent further comprises a temperature regulating chamber 4 accommodating the connecting plate 10 , a plurality of load sensors and the synchronous rotation device 5 .

[0037] According to another preferred embodiment of the present invention, the output shaft 2 of the linear motor 1 is connected to the connecting disk 10 through an extension rod 8 and a connecting unit, the connecting unit includes a fixed disk and a hollow cylinder arranged in the center of the fixed disk, the output shaft 2 of the linear motor 1 is connected to the extension rod 8, the extension rod 8 is threadedly connected to the hollow cylinder, and the fixed disk is connected to the connecting disk 10.

[0038] According to another preferred embodiment of the present invention, the synchronous tension, compression and torsion fatigue testing device for the vascular stent further includes a load sensor height adjustment unit and a claw angle position fine-tuning unit.

[0039] According to another preferred embodiment of the present invention, the load sensor height adjustment unit includes: an adjusting nut 9, which is arranged corresponding to the load sensor and arranged between the support claw and the clamping member provided on the support claw; and an adjusting screw 12, a first end of which is connected to the load sensor, and a second end of which passes through a first through hole provided on the support claw, a through hole of the adjusting nut 9 and a second through hole provided on the clamping member in sequence, and the adjusting screw 12 is threadedly connected to the adjusting nut 9.

[0040] According to another preferred embodiment of the present invention, the clamping member includes a horizontal portion and a vertical portion, the adjusting nut 9 is located between the horizontal portion and the supporting claw, and the vertical portion is connected to the horizontal portion and the supporting claw respectively.

[0041] According to another preferred embodiment of the present invention, see Figure 6 The claw angle position fine-tuning unit includes: a plurality of waist-shaped countersunk holes 103, which are arranged on the disc body 101; and a connecting piece, which is arranged in the waist-shaped countersunk holes 103, and the disc body is fixedly connected to the fixed disc through the connecting piece.

[0042] According to another preferred embodiment of the present invention, the synchronous tension, compression and torsion fatigue testing device for the vascular stent further includes: a coupling 16 connected to the main synchronous wheel 17; a connecting shaft connected to the coupling 16; and a bearing unit connected to the connecting shaft, and the output shaft of the power device is connected to the connecting shaft.

[0043] According to another preferred embodiment of the present invention, the synchronous rotation device 5 is provided with a heat dissipation fan 15 .

[0044] According to another preferred embodiment of the present invention, a waterproof sealing ring is arranged between the bearing seat 14 and the rotating shaft 13, and the temperature regulating cabin 4 includes a transparent organic glass cabin body 22, a heating module 23, a temperature sensor 24, a bottom mounting plate 25 and a controller 26.

[0045] According to another preferred embodiment of the present invention, a synchronous tension, compression and torsion fatigue testing device for a vascular stent is provided, which is characterized by comprising:

[0046] A linear motor 1 capable of providing high-frequency reciprocating motion, which is disposed on a frame 7;

[0047] A multi-axis synchronous tension and compression device 3, comprising an extension rod 8, a connecting plate 10, an adjusting screw 12 and an adjusting nut 9;

[0048] A multi-axis synchronous rotation device 5, comprising a rotating shaft 13, a bearing seat 14, a cooling fan 15, a coupling 16, a main synchronous wheel 17, a slave synchronous wheel 18, a rotating shaft synchronous wheel 19, a main synchronous belt 20 and a slave synchronous belt 21;

[0049] A temperature regulating cabin includes a transparent organic glass cabin body 22, a heating module 23, a temperature sensor 24, a bottom mounting plate 25 and a controller 26.

[0050] Preferably, the temperature regulating chamber is used to provide a constant temperature testing environment for the sample.

[0051] Preferably, the multi-axis synchronous tension and compression device 3 is composed of the extension rod 8, the connecting disk 10 and the connecting shaft. There are six adjusting screws 12, which are evenly distributed around the connecting disk. The upper end of the adjusting screw 12 passes through the connecting disk 10 and is connected to the adjusting nut 9 by threading. The height of the adjusting screw 12 can be precisely adjusted by the adjusting nut 9 at the top. The connecting disk 10 is provided with the top screw mounting hole 11 on the end surface corresponding to each axis. After the height adjustment of the adjusting screw 12 is completed, the top screw is locked in the corresponding top screw mounting hole to ensure that its height will not change again. The lower end of the adjusting screw 12 is connected in series with a high-precision load sensor, and the protruding thin cylindrical reserved thread is used for clamping the test specimen.

[0052] Preferably, the multi-axis synchronous rotation device 5 is composed of the rotating shaft 13, the rotating shaft support seat (bearing seat) 14, the cooling fan 15, the coupling 16, the main synchronous wheel 17, the slave synchronous wheel 18, the rotating shaft synchronous wheel 19, the main synchronous belt 20 and the slave synchronous belt 21. The rotating shaft 13 passes through the rotating shaft support seat 14 and is fixed to the multi-axis synchronous rotation device 5 by threads. There are six groups of rotating shafts 13, which are arranged in a regular hexagonal arrangement, for example.

[0053] Preferably, a lip-shaped rotating seal ring is provided between the rotating shaft 13 and the rotating shaft support seat 14 for waterproofing, and a rubber seal ring waterproof layer is provided on the outside to effectively prevent liquid leakage.

[0054] Preferably, the synchronous movement of the rotating shaft 13 is achieved through a synchronous belt, the rotating shaft 13 is fixedly connected to the rotating shaft synchronous wheel 19, the main synchronous wheel 17 and the slave synchronous wheel 18 are driven by the main synchronous belt 20, and the slave synchronous wheel 18 and the six rotating shaft synchronous wheels 19 are driven by the slave synchronous belt 21.

[0055] Preferably, the cooling fans 15 are provided on both sides of the bottom of the multi-axis synchronous rotation device 5 for actively dissipating heat for the multi-axis synchronous rotation device 5 to avoid the heat generated by the synchronous pulley accumulating inside the tooling during long-term operation, causing excessive temperature and affecting the life of the tooling.

[0056] Preferably, the main synchronous wheel is meshed with the slave synchronous wheel via the main synchronous belt, and the slave synchronous wheel is meshed with the rotating shaft synchronous wheel via the slave synchronous belt.

[0057] Preferably, the linear motor can make the multi-axis synchronous tension and compression device reciprocate at a certain frequency along the running direction of the linear motor main shaft (output shaft). A dustproof net and a cooling fan are installed on the motor housing.

[0058] Preferably, a thread is provided at the lower end of the adjusting screw, the sample is fixed between the adjusting screw and the rotating shaft, and the reciprocating movement of the linear motor can drive the connecting disk to generate reciprocating movement.

[0059] Preferably, the transparent organic glass cabin is connected to the bottom mounting plate by threads, the heating module and the temperature sensor are installed at the bottom of the back of the cabin, and the controller 26 controls the heating module to heat up so that the temperature in the temperature cabin is constant.

[0060] Preferably, the rotating shaft can be made of special steel and additionally treated with rust prevention, which has extremely excellent rigidity, will not deform during long-term operation, and can effectively resist rust in salt spray environments. Cooling fans are set on both sides of the synchronous rotating loading fixture. During long-term operation, the synchronous belt and synchronous wheel will continue to rub and generate heat, and excessively high temperature will accelerate the wear and deformation of the synchronous belt and synchronous wheel, resulting in system failure. The cooling fan can reduce the internal temperature of the system and significantly increase the life of the system.

[0061] Preferably, the test method is as follows:

[0062] (1) Install the sample between the adjusting screw 12 and the rotating shaft 13, adjust the angle of the support claw to make the sample vertical, and fine-tune the adjusting nut 9 to make the load on each group of samples consistent;

[0063] (2) Close the cabin body 22 of the temperature regulating cabin, turn on the controller 26, set the target temperature, and wait for the cabin environment to reach the specified temperature;

[0064] (3) Adjust the operating frequency and amplitude of the linear motor and the power device to achieve the preset experimental conditions, and simultaneously apply tensile, compressive and torsional stresses to the vascular stent.

[0065] The present invention can achieve one or more of the following technical effects:

[0066] 1. Perform synchronous tension, compression and torsion tests on multiple groups of brackets to improve test efficiency.

[0067] 2. Consistent simulated loads and simulated environments can be provided for multiple groups of brackets, and the test results of each bracket are comparable, which is conducive to obtaining effective test results.

[0068] 3. The synchronous belt transmission structure is adopted. This structure realizes transmission by meshing the synchronous belt teeth with the synchronous belt wheel teeth. There is no relative sliding between the two, and the circumferential speed is synchronized. Compared with the gear transmission, the synchronous belt structure can buffer the transmission impact and vibration, has the characteristics of low transmission noise, and does not require lubrication and is easy to maintain. It can meet the requirements of high-speed operation and high-frequency reversing, and it has fewer transmission parts, and only a small space is required to complete the transmission system.

[0069] 4. The diameter of the main synchronous wheel is larger than that of the rotating synchronous wheel, which increases the transmission ratio. When the main shaft rotates at a certain angle, the rotating shaft will rotate at a greater angle. According to the characteristics of the rotating servo motor, under the condition that the reciprocating angle of the rotating shaft is fixed, the upper limit of its operating frequency can be effectively increased.

[0070] 5. The rotating shaft is connected to the rotating synchronous wheel through the bearing seat. The bearing support seat can provide the rotating shaft with high rigidity and high-precision rotation performance to ensure that the rotating shaft will not be deformed due to continuous bending moment (centripetal force) during long-term reciprocating motion, resulting in system failure. A lip-shaped rotating seal is installed between the rotating shaft and the mounting hole, and a rubber seal waterproof layer is added on the outside to ensure effective sealing while the rotating shaft rotates to prevent liquid leakage.

[0071] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A synchronous tension, compression and torsion fatigue test device for a vascular stent, characterized in that include: A reciprocating connection disk connected to the output shaft of the linear motor and comprising a disk body and a plurality of claws arranged along the outer periphery of the disk body, wherein the connection disk can reciprocate in a first direction; A plurality of load sensors are correspondingly arranged on the plurality of claws; A synchronous rotation device, comprising: a plurality of rotating shafts, arranged corresponding to the plurality of load sensors, a blood vessel stent arranged along a second direction is detachably mounted between the rotating shafts and the load sensors, the second direction being parallel to the first direction; a plurality of bearing seats, connecting the plurality of rotating shafts; a plurality of rotating shaft synchronous wheels, connected to the plurality of rotating shafts; a slave synchronous wheel, connected to one of the rotating shafts; a main synchronous wheel, connected to an output shaft of a power device and to the slave synchronous wheel; and a slave synchronous belt, connecting the plurality of rotating shaft synchronous wheels; and The load sensor height adjustment unit includes: an adjusting nut, which is arranged corresponding to the load sensor and disposed between the support claw and the clamping piece provided on the support claw; and an adjusting screw, a first end of which is connected to the load sensor, and a second end of which passes through a first through hole provided on the support claw, a through hole of the adjusting nut and a second through hole provided on the clamping piece in sequence, the adjusting screw is threadedly connected to the adjusting nut, and the adjusting nut is used to adjust the load on the vascular stent.

2. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to claim 1 is characterized in that Also included is a temperature regulating chamber, which accommodates the connection plate, a plurality of load sensors and the synchronous rotation device.

3. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to claim 2 is characterized in that The output shaft of the linear motor is connected to the connecting disk through an extension rod and a connecting unit. The connecting unit includes a fixed disk and a hollow cylinder arranged in the center of the fixed disk. The output shaft of the linear motor is connected to the extension rod, the extension rod is threadedly connected to the hollow cylinder, and the fixed disk is connected to the connecting disk.

4. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to any one of claims 1 to 3, characterized in that Also included is a claw angle position fine-tuning unit.

5. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to claim 4 is characterized in that The support claw angle position fine-tuning unit is used to adjust the support claw angle position so that the blood vessel stent is in a vertical state.

6. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to claim 5 is characterized in that The clamping member comprises a horizontal portion and a vertical portion, the adjusting nut is located between the horizontal portion and the supporting claw, and the vertical portion is connected to the horizontal portion and the supporting claw respectively.

7. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to claim 3 is characterized in that The claw angle position fine-tuning unit comprises: a plurality of waist-shaped countersunk holes arranged on the disc body; and a connecting piece arranged in the waist-shaped countersunk holes, and the disc body is fixedly connected to the fixed disc through the connecting piece.

8. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to claim 4 is characterized in that It also includes: a coupling connected to the main synchronous wheel; an adjusting screw connected to the coupling; And a bearing unit is connected to the adjusting screw, and the output shaft of the power device is connected to the adjusting screw.

9. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to claim 6, characterized in that The synchronous rotation device is provided with a heat dissipation fan.

10. The synchronous tension, compression and torsion fatigue testing device for a vascular stent according to claim 7, characterized in that A waterproof sealing ring is arranged between the bearing seat and the rotating shaft, and the temperature regulating cabin comprises a transparent organic glass cabin body, a heating module, a temperature sensor, a bottom mounting plate and a controller.

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