CN216695488U

CN216695488U - Implant fatigue test fixing device

Info

Publication number: CN216695488U
Application number: CN202220298769.6U
Authority: CN
Inventors: 周磊; 李维旭; 周珍珍; 苏捷
Original assignee: Shanghai Ruixi Medical Technology Co ltd
Current assignee: Shanghai Ruixi Medical Technology Co ltd
Priority date: 2022-02-15
Filing date: 2022-02-15
Publication date: 2022-06-07
Anticipated expiration: 2032-02-15

Abstract

The utility model discloses a fixing device for an implant fatigue test, and belongs to the technical field of medical instrument tests. It includes fixed establishment and lower fixed establishment, it includes force sensor to go up fixed establishment, force sensor is connected with anchor clamps, lower fixed establishment include with last anchor clamps matched with anchor clamps down anchor clamps, it still includes hanger dish I and hanger dish II that sets gradually from top to bottom to go up fixed establishment, force sensor is connected with hanger dish II through the fine setting subassembly, the fine setting subassembly include the adjustment post and with adjustment post threaded connection's adjusting nut, adjusting nut is located between hanger dish I and the hanger dish II, the adjustment post passes hanger dish I in proper order, adjusting nut, be connected with force sensor behind the hanger dish II. The fine adjustment component arranged on the upper fixing mechanism is used for realizing fine adjustment of the distance between the upper clamp and the lower clamp, so that the test piece is prevented from being compressed or stretched in the initial stage, and the test accuracy is improved.

Description

Implant fatigue test fixing device

Technical Field

The utility model relates to the technical field of medical instrument testing, in particular to a fixing device for an implant fatigue test.

Background

Implant fatigue testing devices are used to perform cyclic deformation durability tests on various types of surgical implants (e.g., heart valves, vascular stents, vascular liners, occluders, etc.) with the aim of testing the provision of repeated loading conditions to a test specimen during a run to simulate typical or specific physiological loading conditions of a vascular or cardiac prosthetic valve or other implant over time to determine the efficacy, resiliency and wear of the device.

Taking a blood vessel stent as an example, the durability test of the circulatory deformation related to the blood vessel stent comprises the following steps: axial tension and compression, bending, torsion, radial expansion and contraction, wherein the bending test comprises axial compression bending, mandrel bending and coreless mandrel arc bending. As shown in fig. 1, in the axial compression bending test, after a stent 1 is released in a simulated blood vessel 2, the simulated blood vessel 2 is fixed in a set of bending fixing devices 3, the bending fixing devices 3 can rotate the tail end of the simulated blood vessel 2, the bending fixing devices 3 are installed on a device which can continuously transmit periodic axial movement to the simulated blood vessel 2, when the distance between the two bending fixing devices 3 is shortened, the tail end of the simulated blood vessel 2 rotates, and the simulated blood vessel 2 loaded with the stent 1 is bent to a certain curvature radius, so that the axial compression bending durability of the stent 1 is tested.

However, in an actual test, since the upper and lower ends of the bending fixture 3 are fixed, when the simulated blood vessel 2 is installed together with the stent 1, the simulated blood vessel 2 is initially compressed or stretched, so that the initial stress of the stent 1 is not 0, and the test is inaccurate. Therefore, it is necessary to provide a further solution to the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an implant fatigue test fixing device to overcome the defects in the prior art.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

the utility model provides an implant fatigue test fixing device, includes fixed establishment and lower fixed establishment, it includes force sensor to go up fixed establishment, force sensor is connected with anchor clamps, down fixed establishment include with go up anchor clamps matched with anchor clamps down, it still includes the hanger dish I and the hanger dish II that set gradually from top to bottom to go up fixed establishment, force sensor through the fine setting subassembly with hanger dish II is connected, the fine setting subassembly including the adjustment post and with adjustment post threaded connection's adjusting nut, adjusting nut is located hanger dish I with between the hanger dish II, the adjustment post passes in proper order hanger dish I adjusting nut II backs of hanger dish with force sensor connects.

In a preferred embodiment of the utility model, the outer periphery of the adjusting column comprises a threaded section and smooth sections arranged at two ends of the threaded section, the threaded section is matched with the adjusting nut, and the smooth sections are matched with a through hole I on the hanger disc I and a through hole II on the hanger disc II.

In a preferred embodiment of the utility model, the diameter of the threaded section is larger than the diameter of the smooth section.

In a preferred embodiment of the utility model, the distance between the hanger plate i and the hanger plate ii is adapted to the height of the adjusting nut, and a groove for accommodating a part of the threaded section is formed on one side of the hanger plate i and/or the hanger plate ii facing the adjusting nut.

In a preferred embodiment of the utility model, a side surface of the hanger plate II facing the adjusting column is provided with a limiting hole, and the limiting hole is used for mounting a bolt to abut against the adjusting column.

In a preferred embodiment of the present invention, a limiting plane is disposed on the circumferential direction of the adjusting column toward the limiting hole.

In a preferred embodiment of the utility model, the lower end of the adjusting column is provided with a mounting seat, the mounting seat is L-shaped, one end of the mounting seat is connected with the adjusting column, and the other end of the mounting seat is far away from the hanger plate II and is connected with the force sensor.

In a preferred embodiment of the present invention, the hanger plate i and the hanger plate ii are hollow structures, so that a main vibration shaft of the testing equipment passes through and is connected with the lower fixing mechanism.

In a preferred embodiment of the present invention, the lower fixing mechanism includes a secondary vibration shaft for connecting with the primary vibration shaft, and the secondary vibration shaft is connected with the lower jig.

In a preferred embodiment of the present invention, a hanger plate iii is disposed below the hanger plate ii, and the hanger plate iii is connected to a lower guide sliding sleeve, which is sleeved outside the main vibration shaft.

Compared with the prior art, the utility model has the beneficial effects that:

(1) the distance between the upper clamp and the lower clamp is finely adjusted through the fine adjustment assembly arranged on the upper fixing mechanism, namely, the adjusting nut is clamped between the hanging rack disc I and the hanging rack disc II, and the adjusting column is arranged to penetrate through the hanging rack disc I and the hanging rack disc II, so that the adjusting nut rotates to drive the adjusting column to lift, the upper clamp positioned below the adjusting column is driven to lift, the distance between the upper clamp and the lower clamp is further adjusted, a test piece is prevented from being compressed or stretched in an initial stage, and the test accuracy is improved.

(2) According to the utility model, the adjusting column is formed by arranging the thread section matched with the adjusting nut and the smooth section matched with the through hole I on the hanger disc I and the through hole II on the hanger disc II, so that the clearance between the thread column and the through hole I and the clearance between the thread column and the through hole II are both extremely small, the up-and-down movement stability of the thread column is improved, and the blockage caused by dust accumulation and sundries falling is avoided; furthermore, the diameter of the threaded section is larger than that of the smooth section, so that the adjusting column is always positioned between the hanging frame disc I and the hanging frame disc II, the adjusting column is prevented from falling off due to over adjustment, and further the force sensor and the upper clamp are prevented from falling off, and the testing safety is improved; furthermore, the adjusting nut is limited to move up and down by setting the distance between the hanging rack disc I and the hanging rack disc II to be matched with the height of the adjusting nut, so that the rotating stability of the adjusting nut is improved, and the moving stability of the adjusting column is further improved; simultaneously through set up the recess with the screw thread section adaptation in stores pylon dish I and/or stores pylon dish II towards one side of adjusting nut, increased the distance that the adjustment post can reciprocate, increased the fine setting scope to compact structure.

(3) According to the utility model, the limiting hole is formed in the side surface of the hanging rack disc II facing the adjusting column to install the bolt, so that the radial movement of the adjusting column is limited, the stability of the force sensor and the upper clamp which are positioned below the adjusting column is improved, the movement of a test piece out of test requirements caused by mistaken touch is avoided, and the test accuracy is further improved; and, through set up the spacing plane of matched with on the adjustment post, increased with the area of contact of bolt, further improved restriction effect for force sensor and the last anchor clamps that are located adjustment post below are more stable.

(4) According to the utility model, the L-shaped mounting seat is arranged to connect the adjusting column and the force sensor, and the other end of the mounting seat is far away from the hanger tray II, so that the force sensor is positioned at the outer side of the hanger tray II, and the distance between the force sensor and the hanger tray is further increased, thereby facilitating the installation of a wire arrangement of the force sensor and a test piece.

(5) According to the utility model, the hanging rack disc I and the hanging rack disc II are arranged to be hollow structures, so that a main vibration shaft is convenient to mount, a plurality of test pieces positioned on the circumferential direction of the fixing device are uniformly stressed, and the test accuracy is improved; further, anchor clamps pass through vice vibration axle and main vibration shaft connection down, thereby convenient direct change anchor clamps through removing the connection of main vibration axle and vice vibration axle, the simple operation to avoid anchor clamps to cause the loss to it under the recurrent dismouting, prolonged device life.

(6) According to the utility model, the hanging rack disc III is arranged below the hanging rack disc II and connected with the lower guide sliding sleeve for providing guide limitation for the main vibration shaft, so that the stability and axial retentivity of the main vibration shaft are improved, and the hanging rack disc I, the hanging rack disc II and the hanging rack disc III are sequentially arranged from top to bottom, so that the stability of the fixing device is improved, vibration is uniformly conducted, and the test accuracy is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a prior art flexure fixture;

FIG. 2 is a schematic perspective view of an implant fatigue testing device incorporating the present invention;

FIG. 3 is an enlarged perspective view of the present invention;

FIG. 4 is a schematic side view of a portion of the present invention;

fig. 5 is a schematic diagram of a partial explosion of the present invention.

Specifically, 1, a bracket; 2. simulating a blood vessel; 3. a bending fixture;

100. a housing; 200. a substrate; 210. a transfer flange; 300. a main guide column; 400. a base; 510. a main vibration shaft; 512. a lower guide sliding sleeve;

800. an upper fixing mechanism; 801. a hanging rack disc I; 8011. a through hole I; 802. a hanging rack disc II; 8021. a through hole II; 8022. a groove; 8023. a limiting hole; 803. a hanging rack disc III; 810. a force sensor; 811. adjusting the column; 8111. a threaded segment; 8112. a smooth section; 8113. a limiting plane; 812. adjusting the nut; 8121. an internally threaded bore; 813. a mounting seat; 8131. connecting holes; 814. an upper clamp; 820. a lower fixing mechanism; 821. a secondary vibration shaft; 822. a lower clamp;

900. an environmental simulation box; 910. a top plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Example 1:

fig. 2 shows a state of use of an implant fatigue test fixture, which is particularly suitable for an upper driving type implant fatigue test apparatus, such as shown in fig. 1, which includes a base plate 200, a main guide post 300 and a base 400. The working unit including the main driving mechanism is arranged above the substrate 200, and the fixing device is arranged below the substrate 200. The work unit is covered and is established inside casing 100, the work unit stretches out downwards and has main vibration axle 510, casing 100 both sides are provided with the lead screw and the main guide stand 300 of being connected with the work unit, main guide stand 300 and lead screw setting are on base 400, the lead screw drives base plate 200 and moves down along main guide stand 300, thereby make this fixing device get into the environmental simulation case 900 of placing on the base 400, start the work unit afterwards, drive down fixed establishment 820 periodic up-and-down motion through main vibration axle 510, make the periodic axial motion of test piece that is located between fixed establishment 800 and the lower fixed establishment 820, in order to test.

As shown in fig. 3, in particular, the present fixing device includes an upper fixing mechanism 800 and a lower fixing mechanism 820. The upper fixture 800 includes a force sensor 810, the force sensor 810 having an upper clamp 814 attached thereto. The lower fixing mechanism 820 includes a lower clamp 822 coupled to the upper clamp 814, and a test piece is fixed between the upper clamp 814 and the lower clamp 822.

Go up fixed establishment 800 including the I801 of stores pylon dish and the II 802 of stores pylon dish that set gradually from top to bottom, the I801 of stores pylon dish can be connected with base plate 200 through adaptor flange 210 to be convenient for whole change go up fixed establishment 800. The force sensor 810 is connected with the second hanger tray 802 through the fine adjustment assembly, and the fine adjustment of the distance between the upper clamp 814 and the lower clamp 822 is realized through the fine adjustment assembly, so that the test piece is prevented from being compressed or stretched in the initial stage, and the test accuracy is improved. In this embodiment, the whole circular that is of stores pylon dish I801 and stores pylon dish II 802 to make it can evenly set up a plurality of force transducer 810 and go up anchor clamps 814 in circumference, thereby accomplish the batch test, and the even atress of test piece, the test accuracy is high. The tension and pressure sensor 810 is preferably used because the test piece undergoes compression and tension during testing.

As shown in fig. 4, the fine adjustment assembly includes an adjustment column 811 and an adjustment nut 812 in threaded connection with the adjustment column 811, the adjustment nut 812 is located between the hanger plate i 801 and the hanger plate ii 802, and the adjustment column 811 is connected with the force sensor 810 after passing through the hanger plate i 801, the adjustment nut 812 and the hanger plate ii 802 in sequence. That is, the fine adjustment assembly rotates through the adjustment nut 812 to drive the adjustment post 811 to move up and down, thereby driving the upper clamp 814 below the adjustment post 811 to move up and down, and further adjusting the distance between the upper clamp 814 and the lower clamp 822.

As shown in fig. 5, the outer circumference of the adjustment post 811 includes a threaded section 8111 and smooth sections 8112 provided at both ends of the threaded section 8111. The threaded section 8111 is matched with the adjusting nut 812, that is, the threaded section 8111 is in threaded connection with the internal threaded hole 8121 of the adjusting nut 812. The smooth section 8112 is matched with the through hole I8011 in the hanging rack disc I801 and the through hole II 8021 in the hanging rack disc II 802, so that the diameters of the through hole I8011 and the through hole II 8021 are slightly larger than the diameter of the smooth section 8112, namely, the clearance between the threaded column and the through hole I8011 and the clearance between the threaded column and the through hole II 8021 are extremely small, the up-and-down movement stability of the threaded column is improved, and dust accumulation and blockage caused by falling of impurities are avoided. The adjusting column 811 is arranged by sections, so that the thread section 8111 and the smooth section 8112 can be made of the same material and integrally formed, and can also be made of different materials in an assembling manner, and the cost is reduced. Further, in this embodiment, the diameter of the threaded section 8111 is greater than the diameter of the smooth section 8112, so that the adjusting column 811 is always located between the hanger plate i 801 and the hanger plate ii 802, and it is avoided that the adjusting column 811 falls off due to excessive adjustment, and further the force sensor 810 and the upper clamp 814 fall off, thereby improving the test safety. The interval of hanging rack dish I801 and hanging rack dish II 802 and the high looks adaptation of adjusting nut 812, adjusting nut 812 both sides respectively with the clearance of hanging rack dish I801, the clearance of hanging rack dish II 802 all minimum promptly to restriction adjusting nut 812 reciprocates, improves adjusting nut 812 pivoted stability, and then improves the stability that adjusting post 811 reciprocated. One side of the hanging rack disc I801 and/or the hanging rack disc II 802 facing the adjusting nut 812 is provided with a groove 8022 for accommodating part of the threaded section 8111, in the embodiment, one side of the hanging rack disc II 802 facing the adjusting nut 812 is provided with the groove 8022, the distance that the adjusting column 811 can move up and down is increased through the groove 8022, the fine adjustment range is enlarged, the structure is compact, meanwhile, the length of the threaded section 8111 is smaller than the height of the adjusting nut 812, and the fine adjustment range is further enlarged.

Spacing hole 8023 has been seted up towards adjustment post 811 to the side of hanger dish II 802, and spacing hole 8023 is used for the mounting bolt to lean on adjustment post 811 to the radial movement of restriction adjustment post 811 improves the stability that is located force sensor 810 and upper clamp 814 of adjustment post 811 below, avoids the mistake touching to cause the test piece to produce the outer removal of test requirement, and then improves the test accuracy. The circumferential direction of the adjusting column 811 towards the limit hole 8023 is further provided with a limit plane 8113, so that the contact area with the bolt is increased, the limit effect is further improved, and the force sensor 810 and the upper clamp 814 below the adjusting column 811 are more stable.

The force sensor 810 is connected with the adjusting column 811 through the mounting seat 813, specifically, the lower end of the adjusting column 811 is provided with the mounting seat 813, the mounting seat 813 is L-shaped, the side surfaces of the two ends of the mounting seat 813 can be provided with a connecting hole 8131 so that one end of the mounting seat can be connected with the adjusting column 811, and the other end of the mounting seat 813 is far away from the hanger tray ii 802 and is connected with the force sensor 810. This structure makes force sensor 810 be located the outside of hanger dish II 802, and has further increased distance between them to be convenient for force sensor 810 winding displacement and the installation of test piece.

Example 2:

on the basis of embodiment 1, in this embodiment, the hanging rack disc i 801 and the hanging rack disc ii 802 are hollow structures, so that the main vibration shaft 510 of the testing device penetrates through and is connected with the lower fixing mechanism 820, and the main vibration shaft 510 is located at the center of the fixing device, so that a plurality of testing pieces located on the circumferential direction of the fixing device are uniformly stressed, and the testing accuracy is improved.

A hanging disc III 803 is further arranged below the hanging disc II 802, the hanging disc III 803 is connected with a lower guide sliding sleeve 512, and the outer side of the main vibrating shaft 510 is sleeved with the lower guide sliding sleeve 512, so that the stability and the axial retentivity of the main vibrating shaft 510 are improved. And the hanging bracket disc III 803 can also be used for connecting a top plate 910 on the environment simulation box 900 in the test equipment, so that when the fixing device enters the environment simulation box 900, the environment simulation box 900 closes the top plate 910, a relatively closed test environment is provided, and external interference is avoided. The environmental simulation box 900 can be a constant temperature water tank or a constant temperature hot air box, and is used for simulating the internal temperature working condition of a human body, and a plurality of bracket type instrument materials are sensitive to temperature, such as: internal titanium alloy, shape memory alloy and the like, and fatigue testing needs to be carried out under the real simulated body fluid environment.

Simultaneously, the I801 of stores pylon dish, II 802 of stores pylon dish and III 803 of stores pylon dish set gradually from the top down, have improved this fixing device self stability for the even conduction of vibration, and then have improved the test accuracy. Specifically, the hanging rack disc I801, the hanging rack disc II 802 and the hanging rack disc III 803 all comprise a cylinder and a plate body, and the main vibration shaft 510 sequentially penetrates through the cylinder of the hanging rack disc I801, the cylinder of the hanging rack disc II 802 and the cylinder of the hanging rack disc III 803 and is connected with the lower fixing mechanism 820.

The lower fixing mechanism 820 includes a secondary vibration shaft 821 and a lower jig 822. The sub vibration shaft 821 is connected to the main vibration shaft 510 at one end and connected to the lower jig 822 at the other end. Lower anchor clamps 822 are connected with main vibration axle 510 through vice vibration axle 821, thereby convenient direct change anchor clamps through removing main vibration axle 510 and vice vibration axle 821's connection, the simple operation to avoid frequent dismouting to lead to the fact the loss to it, prolonged device life.

In this embodiment, the upper clamp 814 is a connecting rod, the lower clamp 822 is a plurality of horizontal rods uniformly diverging along a center, and the distal ends of the horizontal rods are provided with holes. Taking a blood vessel stent as an example, during testing, the stent is placed in a simulated blood vessel, connecting rods (not shown in the figure) are also arranged in holes of the horizontal rods, and two ends of the simulated blood vessel are respectively sleeved on the two connecting rods and are fixed in a binding wire or a hoop or a binding belt and the like. The upper and

lower clamps

814 and 822 may be selected according to different test pieces.

In summary, the distance between the upper clamp and the lower clamp is finely adjusted through the fine adjustment assembly arranged on the upper fixing mechanism, namely, the adjustment nut is clamped between the hanger plate I and the hanger plate II, and the adjustment column is arranged to penetrate through the hanger plate I and the hanger plate II, so that the adjustment nut rotates to drive the adjustment column to lift, the upper clamp positioned below the adjustment column is driven to lift, the distance between the upper clamp and the lower clamp is adjusted, the test piece is prevented from being compressed or stretched in the initial stage, and the test accuracy is improved.

Claims

1. The utility model provides an implant fatigue test fixing device, includes fixing mechanism and lower fixing mechanism, it includes force sensor to go up fixing mechanism, force sensor is connected with anchor clamps, lower fixing mechanism include with go up anchor clamps matched with anchor clamps down, a serial communication port, it still includes the hanger dish I and the hanger dish II that set gradually from top to bottom to go up fixing mechanism, force sensor through the fine setting subassembly with hanger dish II is connected, the fine setting subassembly including the adjustment post and with adjustment post threaded connection's adjusting nut, adjusting nut is located hanger dish I with between the hanger dish II, the adjustment post passes in proper order hanger dish I adjusting nut II back with force sensor connects.

2. The implant fatigue test fixing device as claimed in claim 1, wherein the adjusting column comprises a threaded section and smooth sections arranged at two ends of the threaded section, the threaded section is matched with the adjusting nut, and the smooth sections are matched with the through hole I on the hanger plate I and the through hole II on the hanger plate II.

3. The implant fatigue test fixture of claim 2, wherein the threaded section has a diameter greater than a diameter of the smooth section.

4. The implant fatigue test fixing device as claimed in claim 3, wherein the distance between the first and second hanger plates is adapted to the height of the adjusting nut, and a groove for accommodating a part of the thread section is formed on one side of the first and/or second hanger plates facing the adjusting nut.

5. The implant fatigue test fixing device as claimed in claim 1, wherein a limiting hole is opened on the side of the hanger plate II facing the adjusting column, and the limiting hole is used for mounting a bolt to abut against the adjusting column.

6. The implant fatigue test fixture of claim 5, wherein a stop plane is provided circumferentially of the adjustment post toward the stop hole.

7. The implant fatigue test fixing device of claim 1, wherein the lower end of the adjusting column is provided with a mounting seat, the mounting seat is L-shaped, one end of the mounting seat is connected with the adjusting column, and the other end of the mounting seat is far away from the hanger plate II and is connected with the force sensor.

8. The implant fatigue test fixture as claimed in claim 1, wherein the first and second hanger plates are hollow for a main vibration axis of a test device to pass through and connect with the lower fixture.

9. The implant fatigue test fixture of claim 8, wherein the lower fixture includes a secondary vibrating shaft for coupling with the primary vibrating shaft, the secondary vibrating shaft coupled with the lower fixture.

10. The implant fatigue test fixing device as claimed in claim 8, wherein a hanging disc III is arranged below the hanging disc II, a lower guide sliding sleeve is connected with the hanging disc III, and the lower guide sliding sleeve is sleeved outside the main vibration shaft.