Vascular stent bending fatigue testing device

Abstract

The utility model provides an intravascular stent bending fatigue testing device. The intravascular stent bending fatigue testing device comprises an upper fixing disc, a lower fixing disc and a plurality of bending assemblies installed between the upper fixing disc and the lower fixing disc. The bending assembly comprises two mounting seats which are respectively connected with the upper fixing disc and the lower fixing disc, each mounting seat is rotatably connected with two joint assemblies, the joint assemblies which are vertically aligned with each other are connected through a test tube, and an intravascular stent is mounted in the test tube; the upper fixing disc is driven by a motor to reciprocate in the direction perpendicular to the lower fixing disc, and the testing tube is driven to drive the intravascular stent in the testing tube to be bent. The intravascular stent bending fatigue testing device can drive the intravascular stent to bend at high frequency, the bending fatigue performance of the intravascular stent can be efficiently detected, and the testing efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field related to medical device inspection and detection, and more precisely to a vascular stent bending fatigue testing device. Background Art

[0002] Cardiovascular and cerebrovascular diseases are a general term for cardiovascular and cerebrovascular diseases. They generally refer to hemorrhagic or ischemic diseases of the brain, heart, and systemic tissues caused by various diseases such as atherosclerosis, blood viscosity, hyperlipidemia, and hypertension. Atherosclerosis is the most common and important type of a group of vascular diseases of arteriosclerosis. Interventional vascular stents are a very common and effective treatment for occlusive atherosclerosis. Vascular stents refer to the placement of an internal stent in the lesion segment on the basis of luminal balloon dilatation to support the narrowed occluded segment of the blood vessel, reduce the elastic retraction and reshaping of the blood vessel, and maintain smooth blood flow in the lumen. Studies have found that better stent flexibility and good bending performance can greatly reduce intraoperative risks in complex and tortuous blood vessels.

[0003] Existing vascular stents are becoming more and more perfect in terms of flexibility, support, compatibility and durability. However, since vascular stents are not easy to remove and need to be placed in locations that often bend (such as the femoral artery and carotid artery), the field has high requirements for the bending fatigue performance of vascular stents. In order to ensure the bending fatigue performance of vascular stent products, it is necessary to conduct bending fatigue tests on them. Existing vascular stent bending fatigue test schemes mostly use servo motors to drive the swing arm to rotate and drive the vascular stent to bend. The swing arm in this scheme has inertial force, and the vascular stent repeatedly rotates and bends, which cannot achieve high-frequency motion. The test frequency is only about 2Hz, resulting in low test efficiency.

[0004] In summary, the art needs a technical solution that can perform high-frequency vascular stent testing to quickly evaluate the bending fatigue performance of the vascular stent. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a vascular stent bending fatigue testing device, which adopts upper and lower fixed plates to drive the test tube to perform synchronous high-frequency bending, and a vascular stent is installed in the test tube to achieve the function of high-frequency testing of the vascular stent.

[0006] To achieve the above object, the utility model provides a bending fatigue test device for a vascular stent, which comprises an upper fixing plate, a lower fixing plate and a plurality of bending components installed between the upper fixing plate and the lower fixing plate; the bending components include two mounting seats respectively connected to the upper fixing plate and the lower fixing plate, and two joint components are rotatably connected to each mounting seat, and the test tubes are connected between the mutually perpendicular and aligned joint components, and a vascular stent is installed inside the test tubes; the upper fixing plate is driven by a motor to reciprocate in a direction perpendicular to the lower fixing plate, and the test tubes are driven to drive the vascular stent inside them to bend.

[0007] Preferably, the mounting seat has a mounting groove, and the mounting grooves of the vertically aligned mounting seats are arranged oppositely; the joint components are rotatably installed inside the mounting grooves.

[0008] Preferably, the joint component includes a joint body and a screw rod, the screw rod passes through the joint body, and both ends of the screw rod are threadedly fixed to the two side edges of the mounting groove respectively, and the joint body is rotatably connected to the screw rod through two bearings, and the two bearings are respectively located on the two side surfaces of the joint body; a test tube joint is formed by extending the bottom side of the joint body, and the end of the test tube is sleeved and fixed on the test tube joint.

[0009] Preferably, two springs are arranged around the screw rod, and the springs are located between the joint body and the side wall of the mounting groove, one end of the spring abuts against the bearing, and the other end abuts against the side wall of the mounting groove.

[0010] Preferably, a waterway joint is formed by extending the bottom side of the joint body, a waterway hole is arranged inside the waterway joint, a test hole is arranged inside the test tube joint, and the waterway hole is communicated with the test hole; the waterway joint is communicated with a water circulation structure and is externally connected to a gas source at the same time.

[0011] Preferably, a plurality of anti-slip protrusions are arranged on the outer side of the test tube joint.

[0012] Preferably, two test tubes are arranged between the vertically aligned mounting seats, and when the two test tubes are pressed and bent, the directions are opposite and they are far away from each other.

[0013] Compared with the prior art, the advantages of a bending fatigue test device for a vascular stent disclosed by the present utility model are as follows: The bending fatigue test device for a vascular stent can drive the vascular stent to bend at a high frequency, efficiently detect the bending fatigue performance of the vascular stent, and has a higher test efficiency; the bending fatigue test device for a vascular stent can simultaneously test multiple vascular stents, further improving the test efficiency; the bending fatigue test device for a vascular stent can adapt to different specifications and lengths of stents, with better applicability; the bending fatigue test device for a vascular stent can achieve constant temperature water circulation in the test tube and can also adjust the internal pressure by an external gas source, more accurately simulating the application environment of the vascular stent and improving the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] As Figure 1 shown is a schematic structural diagram of a bending fatigue test device for a vascular stent of the present utility model.

[0016] As Figure 2 shown is a schematic structural diagram of a bending assembly of a bending fatigue test device for a vascular stent of the present utility model.

[0017] As Figure 3 shown is a front sectional view of a bending assembly of a bending fatigue test device for a vascular stent of the present utility model.

[0018] As Figure 4 shown is a side sectional view of a bending assembly of a bending fatigue test device for a vascular stent of the present utility model.

[0019] As Figure 5 shown is a schematic structural diagram of a joint assembly of a bending fatigue test device for a vascular stent of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0021] As Figure 1As shown in the figure, a bending fatigue test device for a vascular stent of the present application includes an upper fixing plate 11, a lower fixing plate 12, and a plurality of bending components installed between the upper fixing plate 11 and the lower fixing plate 12. The bending components are parallel to each other. The bending component includes two mounting seats 2 respectively connected to the upper fixing plate 11 and the lower fixing plate 12. Two joint components 3 are rotatably connected to each mounting seat 2. And the joint components 3 of the two mounting seats 2 that are perpendicularly aligned with each other are connected by a test tube 4. A vascular stent is installed inside the test tube 4. The upper fixing plate 11 is driven by a motor to reciprocate in a direction perpendicular to the lower fixing plate 12, driving the test tube 4 to drive the vascular stent inside it to bend for bending fatigue testing.

[0022] The upper fixing plate 11 moves synchronously with the output shaft of the motor, with a higher frequency, which can effectively shorten the test duration and perform the test more efficiently. In addition, the bending fatigue test device for the vascular stent can perform bending fatigue tests on multiple groups of vascular stents synchronously, further improving the test efficiency. By replacing the test tube 4 with different inner diameters, it can be adapted to vascular stents with different diameter specifications. By changing the distance between the upper fixing plate 11 and the lower fixing plate 12, it can be adapted to vascular stents with different length specifications. That is, the bending fatigue test device for the vascular stent can be adapted to vascular stents with different specifications and lengths, and has better applicability.

[0023] See Figure 2 , the mounting seat 2 has a mounting groove 20, and the mounting grooves 20 of the upper and lower aligned mounting seats 2 are arranged oppositely. The two ends inside the mounting groove 20 are respectively rotatably connected to the joint component 3. Two test tubes 4 are arranged between the upper and lower aligned mounting seats 2. When the two test tubes 4 are pressed and bent, their directions are opposite and they move away from each other to prevent the test tubes 4 from interfering with each other.

[0024] See Figures 3 to 5 , the joint component 3 includes a joint body 30 and a screw 31. The screw 31 passes through the joint body 30, and the two ends of the screw 31 are respectively threadedly fixed to the two side edges of the mounting groove 20. The joint body 30 is rotatably connected to the screw 31 through at least two bearings 311. The two bearings 311 are respectively located on the two sides of the joint body 30. The joint body 30 is connected to the screw 31 through the bearings 311, which can reduce friction and ensure the smooth rotation of the joint body 30. A test tube joint 32 extends from the bottom side of the joint body 30. The end of the test tube 4 is sleeved and fixed on the test tube joint 32. Preferably, there are several anti-slip protrusions on the outer side of the test tube joint 32 to prevent the test tube 4 from falling off.

[0025] Two springs 312 are also arranged around the screw rod 31. The springs 312 are located between the joint body 30 and the side wall of the installation groove 20. One end of the spring 312 abuts against the bearing 311, and the other end abuts against the side wall of the installation groove 20. By arranging the two springs 312, it can be ensured that the joint body 30 is in a centered state during rotation, preventing the disturbance of the bending direction of the test tube 4 caused by deviation, and improving the accuracy of the test.

[0026] A waterway joint 33 is formed by extending the bottom side of the joint body 30. The waterway joint 33 has a waterway hole 330 inside, and the test tube joint 32 has a test hole 320 inside. The waterway hole 330 is communicated with the test hole 320. The waterway joint is communicated with the water circulation structure and is externally connected to a gas source at the same time. By arranging the waterway joint 33, a constant temperature water circulation can be realized in the test tube 4, and the internal pressure can also be adjusted through the externally connected gas source, more accurately simulating the application environment of the vascular stent and improving the accuracy of the test.

[0027] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vascular stent bending fatigue testing device, characterized in that: It comprises an upper fixed plate, a lower fixed plate and a plurality of bending components installed between the upper fixed plate and the lower fixed plate; the bending components comprise two mounting seats respectively connected to the upper fixed plate and the lower fixed plate, each mounting seat is rotatably connected to two joint components, and the joint components vertically aligned with each other are connected through a test tube, and a vascular stent is installed inside the test tube; the upper fixed plate is driven by a motor to reciprocate in a direction perpendicular to the lower fixed plate, and the test tube is driven to bend the vascular stent inside it.

2. The vascular stent bending fatigue testing device according to claim 1, characterized in that: The mounting seat has a mounting groove, and the mounting grooves of the mounting seats aligned up and down are arranged relatively to each other; the joint assembly is rotatably mounted inside the mounting groove.

3. The vascular stent bending fatigue testing device according to claim 2, characterized in that: The joint assembly includes a joint body and a screw rod, the screw rod passes through the joint body, and the two ends of the screw rod are respectively threaded and fixedly connected to the two side edges of the mounting groove, the joint body is rotatably connected to the screw rod through two bearings, and the two bearings are respectively located on the two side surfaces of the joint body; the bottom side of the joint body extends to form a test tube joint, and the end of the test tube is sleeved and fixed on the test tube joint.

4. The vascular stent bending fatigue testing device according to claim 3, characterized in that: Two springs are arranged around the screw rod, and the springs are located between the joint body and the side wall of the installation groove. One end of the spring abuts against the bearing, and the other end abuts against the side wall of the installation groove.

5. The vascular stent bending fatigue testing device according to claim 3, characterized in that: The bottom side of the joint body extends to form a water channel joint, the water channel joint has a water channel hole inside, the test pipe joint has a test hole inside, the water channel hole is connected to the test hole; the water channel joint is connected to the water circulation structure and is connected to an external air source.

6. The vascular stent bending fatigue testing device according to claim 3, characterized in that: The outer side of the test pipe joint is provided with a plurality of anti-slip protrusions.

7. The vascular stent bending fatigue testing device according to claim 2, characterized in that: Two test tubes are arranged between the mounting seats aligned up and down, and the two test tubes bend in opposite directions and away from each other when compressed.

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