CN213580060U

CN213580060U - Modular femoral component testing clamp with handle

Info

Publication number: CN213580060U
Application number: CN202022829976.3U
Authority: CN
Inventors: 陈鸿威; 杨阳; 杨帆; 贾圣; 李承洪; 钱文博; 修双凤
Original assignee: Xiamen Tengweisheng Testing Technology Co ltd; Huaqiao University
Current assignee: Xiamen Tengweisheng Testing Technology Co ltd; Huaqiao University
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-06-29
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a modular femur component testing clamp with a handle, which comprises a flange plate, a ring, a thrust bearing and a plurality of ball head modules; a plurality of first fixing pieces are fixedly arranged outside the flange plate; the first end face of the ball head module is concavely provided with a segment, the circular ring is sleeved outside the ball head module in a matched manner and is provided with a plurality of second fixing pieces which penetrate through the circular ring from outside to inside and are fixedly connected to the ball head module so as to assemble, disassemble and fixedly assemble the circular ring and the ball head module together; the flange plate and the ball head module are arranged at intervals along a first direction, the thrust bearing is arranged between the flange plate and the second end face of the ball head module, a tension spring is connected between the first fixing piece of the flange plate and the second fixing piece of the ring, and the ring is hung on the flange plate through the tension spring. It has the following advantages: the test fixture has the advantages of modular production, simple disassembly and operation and low manufacturing cost, can clamp the ball head of the femoral component with the handle to measure the fatigue performance, and can meet the requirements of domestic and foreign test standards.

Description

Modular femoral component testing clamp with handle

Technical Field

The utility model relates to a medical instrument tests technical field, especially relates to a modular take handle thighbone part test fixture.

Background

In the processes of daily exercise, tourism, competition and the like, tissues, joints and bones of people inevitably have strain, and the surgical implant is born in order to ensure that normal life can be restored after relevant problems occur. Common surgical implants are composed of titanium alloys, iron alloys, ceramics and synthetic materials, and the surgical implants implanted in the human body should ensure that they are not damaged within a certain period of use. Therefore, the implant needs to be subjected to various performance tests, wherein the fatigue performance test is the most critical item. The hip joint is a joint of a joint part of acetabulum at the position of human femur and pelvis, a hip joint femoral component with a handle comprises a ball head and a bone handle, in related domestic and international test standards, the component is required to be cured in an elastomer with certain elastic modulus at a specific angle, and then a certain clamp with a low-friction device is used for applying a cyclic load passing through the center of the ball head on the ball head of the femoral component until the component meets the condition required by the standard. At present, no clamp capable of realizing the test of the femoral component, which can meet the requirements of domestic and foreign standards, is found.

SUMMERY OF THE UTILITY MODEL

The utility model provides a modular take handle thighbone part test fixture, it has overcome the not enough that takes handle thighbone part test to exist among the background art.

The utility model provides an adopted technical scheme of its technical problem is: a modular femur component test fixture with a handle comprises a flange plate, a circular ring, a thrust bearing and a plurality of ball head modules; a plurality of first fixing pieces are fixedly arranged outside the flange plate; the first end surface of the ball head module is concavely provided with a ball gap, the ball gap radiuses of a plurality of ball head modules are different to adapt to ball heads of femur components with handles with different radiuses, the circular ring is sleeved outside the ball head module in an adaptive manner and is provided with a plurality of second fixing pieces which penetrate through the circular ring from outside to inside and are fixedly connected to the ball head module to enable the circular ring and the ball head module to be assembled, disassembled and fixedly connected together; the flange plate and the ball head module are arranged at intervals along a first direction, the thrust bearing is arranged between the flange plate and the second end face of the ball head module, a tension spring is connected between the first fixing piece of the flange plate and the second fixing piece of the ring, and the ring is hung on the flange plate through the tension spring.

In one embodiment: the ball head module comprises a cylinder, and the first end face of the cylinder is concavely provided with the ball notch.

In one embodiment: the flange plate axis, the circular ring axis, the cylindrical axis and the segment axis are coaxial and are arranged along a first direction.

In one embodiment: the ring flange is fixedly provided with N first fixing parts which are arranged at intervals in the circumferential direction, the ring is provided with N second fixing parts which are arranged at intervals in the circumferential direction, and the tension springs are arranged between each corresponding first fixing part and each corresponding second fixing part.

In one embodiment: the first fixing piece and the second fixing piece are both screws.

In one embodiment: the outer diameter of the flange plate is equal to that of the circular ring.

In one embodiment: the first end surface of the flange plate is concavely provided with a first circular groove, the second end surface of the ball head module is concavely provided with a second circular groove, and two ends of the thrust bearing are respectively positioned in the first circular groove and the second circular groove.

In one embodiment: the second end surface of the flange is convexly provided with a circular boss, the top surface of the part of the flange surrounding the circular boss is concavely provided with a first countersunk hole, and the bottom surface is concavely provided with a second countersunk hole.

Compared with the background technology, the technical scheme has the following advantages:

the test fixture is produced in a modularized mode, is easy to disassemble and operate, is low in manufacturing cost, can clamp the ball head of the femoral component with the handle to measure the fatigue performance, and can meet the requirements of domestic and foreign test standards.

Drawings

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

FIG. 1 is a schematic perspective view of an embodiment test fixture;

FIG. 2 is a schematic cross-sectional view of an embodiment test fixture;

description of reference numerals: the method comprises the following steps of 1-flange plate, 2-countersunk hole, 3-thrust bearing, 4-ball head module, 5-ring, 6-ball head, 7-screw, 8-tension spring, 9-circular boss, 10-circular groove and 11-threaded hole.

Detailed Description

Referring to fig. 1 and 2, a modular femoral component testing fixture with a handle includes a flange 1, a ring 5, a thrust bearing 3 and a plurality of ball head modules 4; the flange plate 1 is concavely provided with a threaded hole 11, and a plurality of screws 7 are screwed in the threaded hole 11; the lower end surface of the ball head module 4 is concavely provided with a ball gap, the ball gap radiuses of a plurality of ball head modules 4 are unequal to adapt to ball heads 6 of femur components with handles with different radiuses, the circular ring 5 is adapted to be sleeved outside one ball head module 4 selected according to the radius of the ball head 6, the circular ring 5 is provided with threaded holes 11 which are arranged in a penetrating way from inside to outside, and is provided with a plurality of threaded holes 11 which penetrate through the circular ring 5 from outside to inside and is fixedly connected to the ball head module 4 so as to assemble, disassemble and fixedly fix the circular ring 5 and the ball head module 4 together by screws 7; the flange plate 1 and the ball head module 4 are arranged at intervals along the up-down direction, the thrust bearing 3 is arranged between the lower end face of the flange plate 1 and the upper end face of the ball head module 4 to provide a low-friction device, the tension spring 8 is connected between the screw 7 of the flange plate 1 and the screw 7 of the ring 5, and the tension spring 8 is used for connecting the upper screw 7 and the lower screw 7 to hang the ring 5 on the flange plate 1.

The protruding circular boss 9 that is formed with of end surface middle part on this ring flange 1, the concave first counter sink 2 of establishing of top surface of the part that surrounds circular boss 9 of this ring flange 1, the concave second counter sink that is equipped with of bottom surface, wherein: the circular boss 9 and the test machine platform are aligned, and the flange plate 1 and the test machine platform are connected together through the counter sink 2.

The lower end surface of the flange 1 and the upper end surface of the ball module 4 are both concavely provided with circular grooves 10, the two ends of the thrust bearing 3 are respectively positioned in the two circular grooves 10 to position the thrust bearing 3 through the two circular grooves 10 to limit the movement of the thrust bearing 3, and the thrust bearing 3 is placed in the circular grooves 10 of the flange 1 and the ball module 4 to provide a low-friction device.

The ball head module 4 comprises a cylinder, the first end face of the cylinder is concavely provided with the ball notch groove, and the axis of the flange plate 1, the axis of the ring 5, the axis of the cylinder and the axis of the ball notch are coaxial and are arranged along the vertical direction; the outer diameter of the flange plate 1 is equal to that of the ring 5; four screws 7 which are uniformly arranged at intervals in the circumferential direction are fixedly arranged outside the flange plate 1, and the ring 5 is provided with the four screws 7 which are uniformly arranged at intervals in the circumferential direction.

In the modular test fixture for the femoral component with the handle according to the embodiment, the test of the femoral component with the handle can generate the following two application cases due to the difference of the size, the material, the surface roughness and the like of the ball head 6.

The head of the femur component is made of metal material with higher strength.

The head of the femoral component is made of titanium alloy, the titanium alloy has high strength and can directly bear the pressure of the metal plate, and the head cannot burst suddenly due to the pressure, so that a tester can directly install the flange plate 1 on a machine table. After installation, the plane is in point contact with the ball head 6, and the applied pressure is ensured to pass through the spherical center of the ball head 6. The edge of the circular groove 10 is prevented from directly contacting the femoral component ball 6 during compression, so as not to generate unnecessary large stress.

And (II) the head of the femoral component is made of a lower-strength material.

The strength of composite materials, ceramics and plastics is generally weak, if the composite materials, ceramics and plastics are directly stressed by a metal plate, the head part of the composite materials can burst suddenly, so that the ring 5, the screw 7 and the ball head module 4 are required to be arranged on the flange plate 1, and in order to keep the load passing through the center of the ball head of the test sample and consistent with the axial direction of the testing machine, a low-friction mechanical device (a thrust bearing 3) is required to be used for minimizing the force inconsistent with the axial direction of the testing machine. Because the sizes of thighbones of different countries, races and sexes have larger differences, the sizes of the thighbone parts actually vary from person to person, and a tester can replace the ball head module 4 with a ball gap with a proper size to adapt to the sizes of different thighbone part ball heads 6 during testing of the thighbone parts with handles, so that the modularized thighbone part testing clamp in the specific embodiment can meet the standard requirements at home and abroad.

This embodiment's modular area handle thighbone part test fixture can change the low friction device that bulb module and standard required according to actual conditions, specifically is: 1. when the material of the ball head of the femoral component is high-strength titanium alloy, the flange can be directly used for applying load; 2. the low friction device is equipped to counteract some forces irrelevant to the applied load direction, and can be equipped with thrust bearings of different models and specifications according to the applied load force, and the device has low cost and simple installation.

This embodiment's a modular take handle thighbone part test fixture, the ring flange contain 4 screw holes of four counter bores in circular boss, circular recess, bottom and side, and the tester is before the test, and the centering is carried out to the circular boss of accessible, and the staff of being convenient for carries out the installation of ring flange and board.

The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims

1. A modular stemmed femoral component test fixture, comprising: the ball head module comprises a flange plate, a circular ring, a thrust bearing and a plurality of ball head modules; a plurality of first fixing pieces are fixedly arranged outside the flange plate; the first end surface of the ball head module is concavely provided with a ball gap, the ball gap radiuses of a plurality of ball head modules are different to adapt to ball heads of femur components with handles with different radiuses, the circular ring is sleeved outside the ball head module in an adaptive manner and is provided with a plurality of second fixing pieces which penetrate through the circular ring from outside to inside and are fixedly connected to the ball head module to enable the circular ring and the ball head module to be assembled, disassembled and fixedly connected together; the flange plate and the ball head module are arranged at intervals along a first direction, the thrust bearing is arranged between the flange plate and the second end face of the ball head module, a tension spring is connected between the first fixing piece of the flange plate and the second fixing piece of the ring, and the ring is hung on the flange plate through the tension spring.

2. A modular stemmed femoral component test fixture as claimed in claim 1, in which: the ball head module comprises a cylinder, and the first end face of the cylinder is concavely provided with the ball notch.

3. A modular stemmed femoral component test fixture as claimed in claim 2, in which: the flange plate axis, the circular ring axis, the cylindrical axis and the segment axis are coaxial and are arranged along a first direction.

4. A modular stemmed femoral component test fixture as claimed in claim 1, in which: the ring flange is fixedly provided with N first fixing parts which are arranged at intervals in the circumferential direction, the ring is provided with N second fixing parts which are arranged at intervals in the circumferential direction, and the tension springs are arranged between each corresponding first fixing part and each corresponding second fixing part.

5. A modular stemmed femoral component test fixture as claimed in claim 1, in which: the first fixing piece and the second fixing piece are both screws.

6. A modular stemmed femoral component test fixture as claimed in claim 1, in which: the outer diameter of the flange plate is equal to that of the circular ring.

7. A modular stemmed femoral component testing jig as claimed in any one of claims 1 to 6 in which: the first end surface of the flange plate is concavely provided with a first circular groove, the second end surface of the ball head module is concavely provided with a second circular groove, and two ends of the thrust bearing are respectively positioned in the first circular groove and the second circular groove.

8. The modular stemmed femoral component test fixture of claim 7, wherein: the second end surface of the flange is convexly provided with a circular boss, the top surface of the part of the flange surrounding the circular boss is concavely provided with a first countersunk hole, and the bottom surface is concavely provided with a second countersunk hole.