Fatigue testing device

Abstract

The fatigue testing device comprises a fixing assembly and a testing sleeve, the fixing assembly comprises a fixing body and a support fixing seat arranged on the fixing body, the support fixing seat is used for fixing a support to be tested, and the testing sleeve is connected with the fixing body and can move relative to the support fixing seat in the first direction. At least one of the test sleeve and the support fixing seat reciprocates along the axial direction of the limiting hole, so that the test sleeve can repeatedly extend into and out of the to-be-tested support, or the to-be-tested support can repeatedly enter and exit from the limiting hole, the to-be-tested support can be repeatedly folded and unfolded, and the fatigue life test of the to-be-tested support is realized. The fatigue testing device provided by the embodiment of the utility model is simple in structure and low in production cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of testing, and particularly relates to a fatigue testing device. BACKGROUND

[0002] Vascular stent intervention is a minimally invasive surgical treatment, which is simple, has small trauma and fast postoperative recovery. In the intervention process of the stent, the stent usually needs to be folded and unfolded multiple times to pass through the corresponding tissues of the human body and finally reach the target position. Therefore, in order to ensure the service life of the foregoing stent, the stent needs to be subjected to fatigue testing.

[0003] However, the fatigue testing device has a complex structure and high production cost. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide a fatigue testing device, which can simplify the structure of the device and reduce the production cost of the device on the basis of fatigue testing of the stent.

[0005] In one aspect, the embodiments of the present application provide a fatigue testing device, which comprises a fixing assembly and a testing sleeve. The fixing assembly comprises a fixing main body and a stent fixing seat arranged on the fixing main body, and the stent fixing seat is used for fixing a stent to be tested. The testing sleeve is connected with the fixing main body and movably arranged along a first direction opposite to the stent fixing seat. The testing sleeve is provided with a limiting hole on a side facing the stent fixing seat, and the limiting hole extends along the first direction. The testing sleeve is used for folding the stent to be tested through the limiting hole. In addition, the testing sleeve is used for extending into the stent to be tested to expand the stent to be tested.

[0006] In some embodiments, the fatigue testing device further comprises a driving assembly arranged on the fixing main body and connected with the testing sleeve. The driving assembly is used for driving the testing sleeve to reciprocate along the first direction.

[0007] In some embodiments, the driving assembly comprises a driving member, a rotating shaft and a transmission member. The driving member is connected with the rotating shaft and used for driving the rotating shaft to rotate. An axial cam groove is arranged on the outer circumferential side of the rotating shaft. A part of the transmission member is clamped in the axial cam groove, and the transmission member is connected with the testing sleeve.

[0008] In some embodiments, the axial cam groove is arranged around the rotating shaft in the circumferential direction.

[0009] In some embodiments, the fixing main body comprises a first support plate and a second support plate. The first support plate and the second support plate are arranged opposite to each other along the first direction. The rotating shaft is rotatably arranged between the first support plate and the second support plate. The driving member is a driving motor. The driving motor is arranged on the second support plate. The motor shaft of the driving motor penetrates through the second support plate and is connected with the rotating shaft.

[0010] In some embodiments, a portion of the transmission member is threaded through at least one of the first support plate and the second support plate in the first direction.

[0011] In some embodiments, the limiting hole includes a first hole section and a second hole section, the second hole section is disposed on the first hole section close to the bracket fixing seat in the first direction; in the first direction, the inner diameter of the second hole section gradually increases in the direction close to the bracket fixing seat, forming a guide arc surface.

[0012] In some embodiments, the fatigue test device further includes a sensing module, the sensing module is configured to detect the number of rotations of the rotating shaft, and calculate the number of fatigue tests of the bracket under test according to the number of rotations.

[0013] In some embodiments, the bracket fixing seat includes a base and a column, the column extends in the first direction and is disposed on the base close to the test sleeve, and the column is configured to be threaded through the bracket under test.

[0014] In some embodiments, the column includes a column body and at least one protrusion, the protrusion is disposed on the outer circumferential side of the column body, and the protrusion is configured to be clamped in the mesh of the bracket under test when the bracket under test is sleeved on the column body.

[0015] The embodiments of the present application provide a fatigue test device, which includes a fixing assembly and a test sleeve, the fixing assembly includes a fixing body and a bracket fixing seat disposed on the fixing body, the bracket fixing seat is configured to fix a bracket under test, and the test sleeve is connected with the fixing body and is movably disposed opposite to the bracket fixing seat in a first direction. Therefore, by reciprocating at least one of the test sleeve and the bracket fixing seat in the first direction, the test sleeve can repeatedly extend into and out of the bracket under test, or the bracket under test can repeatedly enter and exit the limiting hole, so that the bracket under test repeatedly folds and unfolds, and the fatigue life test of the bracket under test is realized. The fatigue test device provided by the embodiments of the present application has simple structure and low production cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced. For those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 is a structural schematic diagram of the fatigue test device provided by some embodiments of the present application;

[0018] Figure 2 is a sectional view schematic diagram of the fatigue test device provided by some embodiments of the present application;

[0019] Figure 3is a cross-sectional view of the test sleeve and the support fixing seat after explosion of the fatigue testing device provided by some embodiments of the present application;

[0020] Figure 4 is a partial enlarged view of the assembly of the column and the support to be tested in the fatigue testing device provided by some embodiments of the present application.

[0021] Label name:

[0022] Fixing assembly 100; fixing body 110; first support plate 111; second support plate 112; support fixing seat 120; base 121; column 122; column body 1221; protrusion 1222;

[0023] Test sleeve 200; limiting hole 210; first hole section 211; second hole section 212; top wall 220; side wall 230; support to be tested 300; driving assembly 400; driving member 410; rotating shaft 420; axial cam groove 421; transmission member 430; guide arc surface S1; first direction X. DETAILED DESCRIPTION

[0024] The features and exemplary embodiments of various aspects of the present application will be described below in detail, in order to make the purposes, technical solutions and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application, and are not configured to limit the present application. The present application can be implemented without some of these specific details by those skilled in the art. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0025] It should be noted that in this paper, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0026] In the related art, the structure of the fatigue testing device can be similar to the iris architecture, which includes an operating rod, a fixed point shaft, a variable shaft, and a lever pressing plate. The variable shaft is connected with the operating rod and the lever pressing plate, respectively. Under the operation of the operating rod, the distance between the variable shaft and the fixed point shaft is shortened or lengthened, so that the lever pressing plate is contracted or expanded, thereby driving the support to be folded or unfolded. In the foregoing fatigue testing device, the connection relationship and transmission mode between components are relatively complex, the production difficulty is great, and the cost is high.

[0027] To solve at least part of the above problems, the embodiments of the present application provide a fatigue testing device, which is provided with a test sleeve with a limiting hole on one side of the support fixing seat along the axial direction of the limiting hole. Through repeated reciprocating movement of at least one of the test sleeve and the support fixing seat along the axial direction of the limiting hole, the support to be tested on the support fixing seat can repeatedly enter and exit the limiting hole of the test sleeve. In this process, the support to be tested can be repeatedly folded and unfolded, thereby realizing the fatigue testing of the support to be tested. The structure of the device is simple, and the production cost is low.

[0028] Please refer to Figure 1 and Figure 2 , the embodiments of the present application provide a fatigue testing device for testing the fatigue characteristics of a support to be tested 300, which includes a fixing assembly 100 and a test sleeve 200. The fixing assembly 100 includes a fixing main body 110 and a support fixing seat 120 arranged on the fixing main body 110, and the support fixing seat 120 is used for fixing the support to be tested 300. The test sleeve 200 is connected with the fixing main body 110 and is movably arranged in the first direction X relative to the support fixing seat 120. The test sleeve 200 is provided with a limiting hole 210 on the side facing the support fixing seat 120, and the limiting hole 210 extends along the first direction X. The test sleeve 200 is used for folding the support to be tested 300 through the limiting hole 210, and / or the test sleeve 200 is used for extending into the support to be tested 300 to expand the support to be tested 300. The specific structure of the fatigue testing device will be introduced below.

[0029] It should be noted that in the embodiments of the present application, the support to be tested 300 can be a vascular stent, or any other support that can be tested in a similar manner. For example, the support to be tested 300 of the present application can also be a heart valve support, etc. The first direction X can be the relative arrangement direction of the test sleeve 200 and the support fixing seat 120, or the axial direction of the limiting hole 210. The first direction X of the present application is not limited to the positive and negative directions, that is, the test sleeve 200 and the support fixing seat 120 can reciprocate towards and away from each other along the first direction X, or the test sleeve 200 and the support fixing seat 120 can relatively approach or move away from each other along the first direction X.

[0030] In some embodiments of the present application, the fixing assembly 100 is connected with the test sleeve 200 and the bracket fixing seat 120, etc. to support and fix the bracket fixing seat 120 and the test sleeve 200, etc. The fixing body 110 can have various shapes, for example, the fixing body 110 can include a connecting plate and a plurality of support plates, which are arranged at intervals and connected with each other through the connecting plate. The bracket fixing seat 120 is used to fix the to-be-tested bracket 300, and during the relative movement of the test sleeve 200 and the bracket fixing seat 120 along the first direction X, the bracket fixing seat 120 can also be used as a guide to guide the test sleeve 200 to extend into the to-be-tested bracket 300 or guide the to-be-tested bracket 300 to enter the limiting hole 210 of the test sleeve 200. The bracket fixing seat 120 can have various structures, for example, the bracket fixing seat 120 can include a column 122 extending along the first direction X, and the to-be-tested bracket 300 is fixed through the column 122.

[0031] In some embodiments of the present application, the test sleeve 200 is a component for fatigue testing of the to-be-tested bracket 300. The test sleeve 200 can be directly connected with the fixing body 110 or indirectly connected with the fixing body 110 through other structures.

[0032] In the fatigue testing device provided in the embodiments of the present application, the fatigue testing method of the to-be-tested bracket 300 can be various.

[0033] In some embodiments, the test sleeve 200 is provided with a limiting hole 210 extending along the first direction X. The fatigue testing device of the present application can fatigue test the to-be-tested bracket 300 through a first fatigue testing method, which can include: moving the test sleeve 200 and the bracket fixing seat 120 along the first direction X towards each other, so that the to-be-tested bracket 300 fixed on the bracket fixing seat 120 enters the limiting hole 210 and is folded by the limiting hole 210; moving the test sleeve 200 and the bracket fixing seat 120 along the first direction X away from each other, so that the to-be-tested bracket 300 moves out of the limiting hole 210 and automatically expands, thereby realizing one fatigue test of the to-be-tested bracket 300. It should be noted that in the present embodiment, the diameter of the limiting hole 210 is smaller than the outer diameter of the to-be-tested bracket 300, so that the to-be-tested bracket 300 can be folded under the action of the limiting hole 210 after entering the limiting hole 210.

[0034] In some other embodiments, the fatigue testing device of the present application can perform fatigue testing on the stent 300 to be tested by a second fatigue testing method, which can include: moving the testing sleeve 200 and the stent fixing seat 120 towards each other along the first direction X, so that the testing sleeve 200 extends into the stent 300 to be tested, and the stent 300 to be tested is expanded; moving the testing sleeve 200 and the stent fixing seat 120 away from each other along the first direction X, so that the testing sleeve 200 moves out of the stent 300 to be tested, and the stent 300 to be tested is automatically rebounded and contracted, thereby achieving a fatigue test on the stent 300 to be tested. It should be noted that in the present embodiment, the outer diameter of the testing sleeve 200 can be greater than the inner diameter of the stent 300 to be tested, so that the stent 300 to be tested can be expanded and deformed outwardly after the testing sleeve 200 extends into the stent 300 to be tested.

[0035] It should be noted that in the second fatigue testing method, the testing sleeve 200 can be provided with a limiting hole 210 extending along the first direction X, or can not be provided with the limiting hole 210, and the present embodiment does not limit this.

[0036] In some other embodiments, the testing sleeve 200 is provided with a connecting portion on the side facing the stent fixing seat 120, and the testing sleeve 200 is used to cooperate with the stent fixing seat 120 through the connecting portion to contract or expand the stent 300 to be tested. Specifically, the fatigue testing device of the present application can perform fatigue testing on the stent 300 to be tested by a third fatigue testing method, which can include: moving the testing sleeve 200 and the stent fixing seat 120 towards each other along the first direction X, so that the testing sleeve 200 and the stent fixing seat 120 can abut against both ends of the stent 300 to be tested along the first direction X, thereby achieving the contraction of the stent 300 to be tested; moving the testing sleeve 200 and the stent fixing seat 120 away from each other along the first direction X, so that the testing sleeve 200 is separated from the stent 300 to be tested, and the stent 300 to be tested is automatically rebounded and expanded, thereby achieving a fatigue test on the stent 300 to be tested.

[0037] It should be noted that the fatigue testing device provided by the embodiments of the present application can perform fatigue testing on the stent 300 along the first direction X, that is, make the stent 300 contract or expand along the first direction X, and can also perform fatigue testing on the stent 300 along other directions perpendicular to the first direction X, that is, make the stent 300 contract or expand along the other directions. For example, in the foregoing first fatigue testing method, after the stent 300 enters the limiting hole 210 of the test sleeve 200, the stent 300 contracts along the radial direction of the limiting hole 210 under the action of the limiting hole 210, and the outer diameter thereof decreases, and at the same time, the stent 300 can also elongate along the axial direction of the limiting hole 210, and when the stent 300 moves out of the limiting hole 210, the stent 300 can automatically rebound in the axial direction and the radial direction of the limiting hole 210.

[0038] The limiting hole 210 has various shapes. For example, the limiting hole 210 can be a through hole or a blind hole, and when the limiting hole 210 is a blind hole, the opening of the limiting hole 210 faces the stent fixing seat 120. Optionally, the test sleeve 200 can be an integral structure, or the test sleeve 200 can be a split structure which can be assembled into a whole along the circumferential direction by multiple petal-shaped structures.

[0039] In some embodiments of the present application, the relative movable arrangement of the test sleeve 200 and the stent fixing seat 120 along the first direction X means that at least one of the test sleeve 200 and the stent fixing seat 120 is arranged to be movable along the first direction X. Specifically, the relative movable arrangement of the test sleeve 200 and the stent fixing seat 120 along the first direction X can mean that the test sleeve 200 or the stent fixing seat 120 is arranged to be movable along the first direction X, or that the test sleeve 200 and the stent fixing seat 120 are both arranged to be movable along the first direction X. The test sleeve 200 and / or the stent fixing seat 120 can be moved in various ways, for example, the test sleeve 200 and / or the stent fixing seat 120 can be driven by the driving assembly 400 to be movable along the first direction X. Of course, the movement of the test sleeve 200 and / or the stent fixing seat 120 along the first direction X can also be realized in a manual manner, and the embodiments are not limited in this regard.

[0040] The fatigue testing device provided in the embodiment of the present application can fix the support to be tested 300 through the support fixing seat 120, the test sleeve 200 is connected with the fixing body 110 and is movably arranged along the first direction X relative to the support fixing seat 120, therefore, through the reciprocating movement of at least one of the test sleeve 200 and the support fixing seat 120 along the first direction X, the test sleeve 200 can repeatedly extend into and out of the support to be tested 300, or the support to be tested 300 can repeatedly enter and exit the limiting hole 210, and then the support to be tested 300 can repeatedly fold and unfold, so that the fatigue life test of the support to be tested 300 is realized. The fatigue testing device provided in the embodiment of the present application has simple structure and low production cost.

[0041] For the convenience of description, the specific structure of the fatigue testing device will be described in detail by taking the fatigue test of the support to be tested 300 by using the first fatigue test method as an example in at least some of the following embodiments. In some cases, at least some of the following embodiments are also applicable to the second fatigue test method and the third fatigue test method.

[0042] Please continue to refer to Figure 1 and Figure 2 In some embodiments, the fatigue testing device further comprises a driving assembly 400, the driving assembly 400 is arranged on the fixing body 110 and is connected with the test sleeve 200, and the driving assembly 400 is used to drive the test sleeve 200 to reciprocate along the first direction X, which helps to reduce the operation difficulty of the fatigue test and improve the test efficiency.

[0043] Specifically, the test sleeve 200 is connected with the driving assembly 400 and is indirectly connected with the fixing body 110 by means of the driving assembly 400. The test sleeve 200 can reciprocate along the first direction X towards the direction of approaching or moving away from the support fixing seat 120 under the driving of the driving assembly 400, so that the support to be tested 300 located on the support fixing seat 120 can enter and exit the limiting hole 210 of the test sleeve 200, and the fatigue test is realized. It should be noted that the fatigue testing device can perform one fatigue test on the support to be tested 300 when the test sleeve 200 reciprocates along the first direction X once.

[0044] The structure of the driving assembly 400 can be various, for example, the driving assembly 400 can be a single type linear driving structure such as a pneumatic cylinder or a hydraulic cylinder, or can be a composite type linear driving structure composed of a motor, a rotating shaft 420 and a transmission member 430, and the present embodiment does not limit this. When the test sleeve 200 is driven by the driving assembly 400, the support fixing seat 120 can be in a fixed state, or the support fixing seat 120 can be driven by other driving structures.

[0045] Please continue to refer to Figure 1 and Figure 2In some embodiments, the driving assembly 400 comprises a driving member 410, a rotating shaft 420 and a transmission member 430. The driving member 410 is connected with the rotating shaft 420 and used to drive the rotating shaft 420 to rotate. The rotating shaft 420 is provided with an axial cam groove 421 on the outer circumferential side. The transmission member 430 is arranged on one side of the rotating shaft 420 along the radial direction of the rotating shaft 420. A part of the transmission member 430 is clamped in the axial cam groove 421. The transmission member 430 is connected with the test sleeve 200. The transmission member 430 is used to move along the first direction X under the action of the axial cam groove 421 when the rotating shaft 420 rotates.

[0046] The driving member 410 can have various structures. For example, the driving member 410 can be a rotary motor. Alternatively, the driving member 410 can be a rotary cylinder or a rotary hydraulic cylinder. Alternatively, the driving member 410 can be a composite structure formed by a combination of a linear driving mechanism and a gear transmission structure.

[0047] The rotating shaft 420 is connected with the driving member 410 and can rotate along the axial direction of the rotating shaft 420 under the driving of the driving member 410. The rotating shaft 420 is provided with an axial cam groove 421 on the outer circumferential side. The axial cam groove 421 can have an arc-shaped structure or a wave-shaped structure. At least a part of the axial cam groove 421 can be inclined relative to the radial direction of the limiting hole 210. That is, the extension direction of at least a part of the axial cam groove 421 intersects with the radial direction of the limiting hole 210. The extension direction can be parallel to the first direction X or forms an acute angle with the first direction X.

[0048] On this basis, the transmission member 430 is connected with the test sleeve 200. A part of the transmission member 430 is clamped in the axial cam groove 421. When the rotating shaft 420 rotates, the position of the transmission member 430 in the first direction X changes under the action of the axial cam groove 421. In turn, the test sleeve 200 is driven to move along the first direction X. The structure is simple and the transmission is stable.

[0049] It should be noted that the shape of the axial cam groove 421 can affect the travel distance of the transmission member 430 and the test sleeve 200 in the reciprocating motion in the first direction X. The axial cam groove 421 can be arranged around the circumference of the rotating shaft 420. At this time, the rotating shaft 420 can be continuously driven to rotate in a certain direction by the driving member 410. This can make the transmission member 430 repeatedly move back and forth in the first direction X. Alternatively, the axial cam groove 421 can be formed on a part of the rotating shaft 420 in the circumferential direction. At this time, the rotating shaft 420 can be alternately driven to rotate in opposite directions by the driving member 410. This can make the transmission member 430 repeatedly move back and forth in the first direction X.

[0050] In the embodiment, the axial direction of the rotating shaft 420 can be parallel to the first direction X, or can be intersected or perpendicular to the first direction X, and the embodiment is not limited in this aspect. Alternatively, the axial direction of the rotating shaft 420 can be parallel to the first direction X, which can reduce the assembly difficulty of the rotating shaft 420 and help improve the stability of the transmission member 430 during movement.

[0051] The at least partial radial inclination of the axial cam groove 421 relative to the limiting hole 210 can refer to that a part of the axial cam groove 421 is inclined relative to the radial direction of the limiting hole 210, and another part is parallel to the radial direction of the limiting hole 210, or can refer to that the entire axial cam groove 421 is inclined relative to the radial direction of the limiting hole 210.

[0052] The transmission member 430 transmits power between the rotating shaft 420 and the test sleeve 200 to drive the test sleeve 200 to move along the first direction X. Specifically, the transmission member 430 can include a first part and a second part connected to each other, the first part is clamped in the axial cam groove 421, and the second part can be in the form of a rod, one end of which is connected to the test sleeve 200. Alternatively, the first part can include a roller, which can roll along the extension direction of the axial cam groove 421 under the action of the axial cam groove 421 when the rotating shaft 420 rotates, thereby realizing the change of its position along the first direction X.

[0053] In some embodiments, the axial cam groove 421 is arranged in a circumferential direction of the rotating shaft 420, so that when the rotating shaft 420 continuously rotates in the same rotation direction, the transmission member 430 can drive the test sleeve 200 to repeatedly move back and forth along the first direction X under the action of the axial cam groove 421, thereby realizing the fatigue test of the stent 300 to be tested and reducing the operation difficulty.

[0054] Please continue to refer to Figure 1 and Figure 2 In some embodiments, the fixed body 110 includes a first support plate 111 and a second support plate 112, the first support plate 111 and the second support plate 112 are arranged in opposite directions along the first direction X, and the rotating shaft 420 is rotatably arranged between the first support plate 111 and the second support plate 112; the driving member 410 is a driving motor, the driving motor is arranged on the second support plate 112, the motor shaft of the driving motor penetrates through the second support plate 112 and is connected with the rotating shaft 420.

[0055] Specifically, the first support plate 111 can support the rotating shaft 420 to improve the stability of the rotating shaft 420 during rotation. The second support plate 112 is arranged opposite to the first support plate 111 along the first direction X, and the rotating shaft 420 is rotatably arranged between the first support plate 111 and the second support plate 112, and the two ends of the rotating shaft 420 are connected with the first support plate 111 and the second support plate 112 respectively, so as to further improve the stability of the rotating shaft 420. The driving member 410 is a driving motor, which is arranged on the side of the second support plate 112 away from the rotating shaft 420 and can be supported by the second support plate 112. The driving motor can be a rotary motor, and the motor shaft of the driving motor can pass through the second support plate 112 and be connected with the rotating shaft 420 to drive the rotating shaft 420 to rotate.

[0056] In some embodiments, a part of the transmission member 430 passes through at least one of the first support plate 111 and the second support plate 112 along the first direction X.

[0057] In some embodiments, the first support plate 111 can be provided with a first through hole extending along the first direction X, and a part of the transmission member 430 can pass through the first support plate 111 through the first through hole. When the transmission member 430 drives the test sleeve 200 to move along the first direction X, the first support plate 111 can limit and guide the transmission member 430 to improve the stability of the movement of the transmission member 430 and the test sleeve 200, reduce the risk of deviation of the test sleeve 200 during movement along the first direction X, and make the support under test 300 on the support fixing seat 120 more accurately and reliably enter and exit the limiting hole 210 of the test sleeve 200.

[0058] In some embodiments, the second support plate 112 can be provided with a second through hole extending along the first direction X, and a part of the transmission member 430 can pass through the second support plate 112 through the second through hole to further limit and guide the transmission member 430 by the second support plate 112.

[0059] It should be noted that the above implementation manner only discloses one part of the fatigue test device provided by the embodiments of the present application, and the above disclosed technical solutions can be split, recombined, and form technical solutions within the protection scope of the present application, which will not be described one by one. The fatigue test device provided by the embodiments of the present application can simultaneously include combinations of the above multiple embodiments.

[0060] Please refer to Figure 3In some embodiments, the limiting hole 210 includes a first hole segment 211 and a second hole segment 212. The second hole segment 212 is disposed along the first direction X on the side of the first hole segment 211 near the bracket fixing seat 120. Along the first direction X near the bracket fixing seat 120, the inner diameter of the second hole segment 212 gradually increases to form a guide arc surface S1.

[0061] In the first direction X, the first hole segment 211 and the second hole segment 212 are arranged sequentially along the direction close to the bracket fixing seat 120, with the second hole segment 212 located between the first hole segment 211 and the bracket fixing seat 120. When the test sleeve 200 moves along the first direction X toward the direction close to the bracket fixing seat 120, the test bracket 300 on the bracket fixing seat 120 first enters the second hole segment 212, and then enters the first hole segment 211 via the second hole segment 212.

[0062] Therefore, in these embodiments, the diameter of the second hole segment 212 gradually increases along the direction close to the bracket fixing seat 120 in the first direction X, forming a guide arc surface S1. The guide arc surface S1 can guide the bracket 300 under test as it enters the limiting hole 210, reducing the difficulty for the bracket 300 under test to enter the limiting hole 210.

[0063] It can be known that at the junction of the first hole segment 211 and the second hole segment 212, the diameter of the second hole segment 212 can be slightly larger than the diameter of the first hole segment 211. Furthermore, along the direction close to the bracket fixing seat 120 in the first direction X, the diameter of the first hole segment 211 can also gradually increase, so that the limiting hole 210 is a smoothly transitioned arc-shaped hole.

[0064] In some embodiments, the fatigue testing device further includes a sensing module for detecting the number of rotations of the rotating shaft 420 and calculating the number of fatigue tests on the support 300 under test based on the number of rotations.

[0065] Understandably, based on the shape of the axial cam groove 421, the number of times the transmission component 430 and the test sleeve 200 reciprocate in the first direction X when the rotating shaft 420 rotates once can be calculated, and then the number of times the test sleeve 200 performs fatigue tests on the test bracket 300 when the rotating shaft 420 rotates once can be calculated.

[0066] by Figure 1 Taking the shape of the axial cam groove 421 as an example, when the rotating shaft 420 rotates one revolution, under the action of the axial cam groove 421, the transmission component 430 can drive the test sleeve 200 to make a reciprocating motion along the first direction X, so as to realize a fatigue test of the bracket 300 under test.

[0067] In some optional embodiments, the driving member 410 is a driving motor, and the sensing module can indirectly obtain the number of rotations of the rotating shaft 420 by detecting the number of rotations of a motor shaft of the driving motor.

[0068] Please continue to refer to Figure 3 In some embodiments, the test set 200 includes a top wall 220 and a side wall 230 arranged along the circumference of the top wall 220, and the top wall 220 and the side wall 230 together define a limiting hole 210, which is located on a side of the top wall 220 close to the support fixing seat 120.

[0069] Specifically, the limiting hole 210 can be a blind hole with one end open and the other end plugged by the top wall 220, wherein the open end is the end of the limiting hole 210 close to the support fixing seat 120 in the axial direction.

[0070] In these embodiments, the limiting hole 210 is located on a side of the top wall 220 close to the support fixing seat 120 by being defined by the top wall 220 and the side wall 230 arranged along the circumference of the top wall 220, so that when the test set 200 moves towards the support fixing seat 120, the to-be-tested support 300 can be folded under the action of the side wall 230 after entering the limiting hole 210. At the same time, when the to-be-tested support 300 moves to a preset position in the limiting hole 210, the top wall 220 can limit the to-be-tested support 300 in the first direction X, preventing the to-be-tested support 300 from moving out of the limiting hole 210 from the side of the limiting hole 210 away from the support fixing seat 120.

[0071] Optionally, when the driving assembly 400 includes a transmission member 430, the transmission member 430 can be connected with the top wall 220, which can reduce the connection difficulty of the transmission member 430 and the test set 200 and improve the connection reliability of the two, compared with arranging the transmission member 430 to be connected to the side wall 230 of the test set 200.

[0072] Please continue to refer to Figure 3 In some embodiments, the support fixing seat 120 includes a base 121 and a column 122, the column 122 extends along the first direction X and is arranged on a side of the base 121 close to the test set 200, and the column 122 is used for being arranged through the to-be-tested support 300.

[0073] The base 121 is used to support the column 122 and the to-be-tested support 300 located on the column 122, and can improve the stability of the to-be-tested support 300 during the fatigue test. The column 122 is arranged on the side of the base 121 close to the test sleeve 200 along the first direction X, extends along the first direction X, and can be arranged through the to-be-tested support 300, that is, the to-be-tested support 300 can be sleeved on the outer circumferential side of the column 122, and the to-be-tested support 300 is supported by the column 122 to reduce the risk of damage of the to-be-tested support 300 during the test.

[0074] It can be understood that when the to-be-tested support 300 is sleeved on the outer circumferential side of the column 122, part of the to-be-tested support 300 can protrude relative to the side surface of the column 122, and when the column 122 and the to-be-tested support 300 enter the limiting hole 210 of the test sleeve 200, the to-be-tested support 300 that protrudes can move towards the side surface of the column 122 under the action of the limiting hole 210, so as to realize the folding of the to-be-tested support 300.

[0075] Please refer to Figure 4 In some embodiments, the column 122 includes a column body 1221 and at least one protrusion 1222 arranged on the outer circumferential side of the column body 1221, and the protrusion 1222 is used to be clamped in the mesh hole of the to-be-tested support 300 when the to-be-tested support 300 is sleeved on the column body 1221.

[0076] The to-be-tested support 300 can be a grid structure and is provided with a plurality of mesh holes. In these embodiments, by arranging at least one protrusion 1222 on the outer circumferential side of the column body 1221, the protrusion 1222 is clamped in the mesh hole of the to-be-tested support 300 when the to-be-tested support 300 is sleeved on the column body 1221, the to-be-tested support 300 can be limited along the first direction X and the circumferential direction of the column body 1221, the risk of position shift of the to-be-tested support 300 along the first direction X and the circumferential direction of the column body 1221 during the fatigue test is reduced, and the reliability and stability of the fatigue test of the to-be-tested support 300 are improved.

[0077] In some embodiments of the present application, the number of protrusions 1222 can be multiple, and multiple protrusions 1222 can be arranged at both ends of the column body 1221 along the first direction X, and the protrusions 1222 at both ends can be clamped in the mesh holes at both ends of the to-be-tested support 300 to further limit the to-be-tested support 300.

[0078] In other embodiments, when the to-be-tested support 300 is sleeved on the outer circumferential side of the column 122, part of the to-be-tested support 300 can be in interference fit with the column 122 to reduce the risk of shift of the to-be-tested support 300 along the first direction X.

[0079] In some embodiments of the present application, for the application scenario of performing fatigue test on the support 300 by using the second fatigue test method, the fatigue test device is similar to the structures in the foregoing embodiments, and the difference is that, in the second fatigue test method, the test sleeve 200 can be provided with the limiting hole 210 or not. In addition, the structure of the support fixing seat 120 in the second fatigue test method is different from that in the first fatigue test method. For example, in the second fatigue test method, the support fixing seat 120 can fix one end of the support 300 along the first direction X from the outside, so that the test sleeve 200 can extend into the support 300 from the other end of the support 300 along the first direction X.

[0080] In some embodiments of the present application, for the application scenario of performing fatigue test on the support 300 by using the third fatigue test method, the fatigue test device is similar to the structures in the foregoing embodiments, and the difference is that, in the third fatigue test method, the test sleeve 200 can have a connecting part which can be in the form of a plate or a block, and the structure of the support fixing seat 120 in the second fatigue test method is different from that in the first fatigue test method. For example, in the third fatigue test method, the support fixing seat 120 can fix one end of the support 300 away from the test sleeve 200 along the first direction X from the inside or the outside, and when the test sleeve 200 moves along the first direction X towards the support fixing seat 120, the test sleeve 200 and the support fixing seat 120 can press the two ends of the support 300, respectively.

[0081] The above is only a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be described here. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A fatigue testing apparatus characterized by comprising: The fatigue testing device comprises: a fixing assembly, which comprises a fixing body and a stent fixing seat arranged on the fixing body, and the stent fixing seat is used for fixing a stent to be tested; a testing sleeve, which is connected with the fixing body and movably arranged with the stent fixing seat along a first direction; the testing sleeve is provided with a limiting hole on a side facing the stent fixing seat, the limiting hole extends along the first direction, and the testing sleeve is used for folding the stent to be tested through the limiting hole; and / or, the testing sleeve is used for extending into the stent to be tested along the first direction to expand the stent to be tested.

2. The fatigue testing device of claim 1, wherein, The fatigue testing device further comprises a driving assembly, which is arranged on the fixing body and connected with the testing sleeve, and the driving assembly is used for driving the testing sleeve to reciprocate along the first direction.

3. The fatigue testing apparatus of claim 2, wherein, The driving assembly comprises a driving member, a rotating shaft and a transmission member, the driving member is connected with the rotating shaft and used for driving the rotating shaft to rotate, and an axial cam groove is arranged on an outer circumferential side of the rotating shaft; a part of the transmission member is clamped in the axial cam groove, and the transmission member is connected with the testing sleeve.

4. The fatigue testing apparatus of claim 3, wherein The axial cam groove is arranged around the rotating shaft along a circumferential direction.

5. The fatigue testing apparatus of claim 3, wherein The fixing body comprises a first support plate and a second support plate, the first support plate and the second support plate are arranged in a relative interval along the first direction, and the rotating shaft is rotatably arranged between the first support plate and the second support plate; the driving member is a driving motor, the driving motor is arranged on the second support plate, a motor shaft of the driving motor penetrates through the second support plate and is connected with the rotating shaft.

6. The fatigue testing device of claim 5, wherein, A part of the transmission member penetrates through at least one of the first support plate and the second support plate along the first direction.

7. Fatigue testing apparatus according to any of claims 1-6, characterized in that The limiting hole comprises a first hole section and a second hole section, the second hole section is arranged on a side of the first hole section close to the stent fixing seat along the first direction; in the first direction, the inner diameter of the second hole section gradually increases in a direction close to the stent fixing seat, forming a guide arc surface.

8. Fatigue testing apparatus according to any of claims 3-6, characterized in that The fatigue testing device further comprises a sensing module, which is used for detecting the number of rotation of the rotating shaft and calculating the number of fatigue tests of the stent to be tested according to the number of rotation.

9. Fatigue testing apparatus according to any of claims 1-6, characterized in that The stent fixing seat comprises a base and a column, the column extends along the first direction and is arranged on a side of the base close to the testing sleeve, and the column is used for penetrating through the stent to be tested.

10. The fatigue testing device of claim 9, wherein, The column comprises a column body and at least one protrusion, the protrusion is arranged on an outer circumferential side of the column body, and the protrusion is used for clamping in a mesh of the stent to be tested when the stent to be tested is sleeved on the column body.

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