Artificial Hip Joint Wear Tester

Abstract

The present application discloses an artificial hip joint wear tester, which includes: an artificial hip joint wear tester, which includes: a workbench and a sensing seat; a guide column is provided on the workbench, and a horizontal top plate is fixed at the top of the guide column; a cam is installed on the horizontal top plate; the cam is connected to the first motor; the cam is connected to the upper end of the transmission shaft, the lower end of the transmission shaft is connected to the upper end of the spring, and the lower end of the spring is on the upper end surface of the connecting plate; a telescopic column and a first clamp are provided on the lower end surface of the connecting plate, and the telescopic column is connected to the middle plate, and the middle plate is movably connected to the guide column; a first sensor is provided on the upper end surface of the middle plate for sensing and comparing samples; a second clamp is provided on the lower end surface of the middle plate for clamping the sample to be tested; the sensing seat is fixed under the second clamp by a supporting foot; a second sensor is installed in the sensing seat for sensing the pressure value of the sample to be tested. The present application can perform wear tests in a motion mode close to that of a human hip joint, thereby obtaining more comprehensive wear test data.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment testing, and in particular to an artificial hip joint wear testing machine. Background Art

[0002] With the advancement of technology, implanting artificial frames into the human body to replace bone joints to help patients gain the ability to move freely is now a common technology in the medical field. After the artificial prosthesis is implanted in the human body, it will produce relative movement with the human body's own bones and tissues during service. In this process, if the artificial frame is worn, it will not only cause mechanical failure, but the wear particles produced will also induce bone dissolution. Therefore, wear tests are required after the artificial prosthesis is manufactured. In the prior art, pin-disc wear tests, ring-disc wear tests, four-ball wear tests and ring-block wear tests are generally used to test the wear of artificial frames. The problem with this scheme is that due to the complex concave-convex spherical structure on the hip joint, it is difficult for the above test to truly reflect the convex-concave spherical contact and matching, multi-directional composite sliding friction form, physiological lubrication environment and periodic cyclic load form of the artificial hip joint, resulting in the test results being greatly limited in clinical application. Therefore, how to develop a new type of artificial hip joint wear tester that can overcome the problems of the above-mentioned existing technical solutions is a direction that technicians in this field need to study. Summary of the invention

[0003] The present application provides an artificial hip joint wear testing machine that can avoid interference from external sudden factors, while enabling artificial hip joint samples to achieve various movement modes close to those of natural hip joints, thereby obtaining more comprehensive wear test data.

[0004] The technical solutions adopted are as follows:

[0005] An artificial hip joint wear tester, comprising: a workbench and an induction seat; the workbench is provided with four guide pillars, the four guide pillars are of equal length, extend in the vertical direction and are arranged in a rectangular shape; the top ends of the four guide pillars are respectively fixed to a horizontal top plate; a cam is installed on the horizontal top plate; the cam is connected to a first motor; the first motor is used to drive the cam to rotate; the cam is connected to the upper end of the transmission shaft, and is used to drive the transmission shaft to reciprocate in the vertical direction when the cam rotates; the lower end of the transmission shaft is connected to the upper end of the spring, and the lower end of the spring is against the upper end surface of the connecting plate; the lower end of the connecting plate The end face is provided with a telescopic column and a first clamp, the connecting plate is connected to the middle plate through the telescopic column, the first clamp is used to clamp the comparison sample; the horizontal top plate is provided with a pulley; the middle plate is connected to the counterweight block through a steel wire rope; the steel wire rope passes around the pulley; the four corners of the middle plate are movably connected to four guide columns respectively; the upper end face of the middle plate is provided with a first sensor corresponding to the first clamp; the lower end face of the middle plate is provided with a second clamp, the second clamp is used to clamp the sample to be tested; the outer sides of the four guide columns are respectively provided with supporting feet; the sensing seat is fixed under the second clamp through the supporting feet; the second sensor is installed in the sensing seat.

[0006] By adopting this technical solution: the cam moves the transmission shaft downward during the rotation process, and the transmission shaft transmits the pressure to the connecting plate and the telescopic column through the spring. The telescopic column is compressed in this process. At this time, the first clamp is close to the first sensor, pressing the comparison sample and reading the pressure value of the comparison sample through the first sensor. At the same time, the middle plate moves downward under the push of the telescopic column, so that the second clamp approaches the sensing seat and presses the sample to be tested. At this time, the second sensing seat reads the pressure value received by the sample to be tested. In this way, the comparison sample and the sample to be tested receive the same pressure value synchronously to achieve the effect of data comparison, thereby avoiding the interference of external sudden factors on the sample data. After the friction test is completed, the middle plate is pulled back to the initial position by operating the counterweight block.

[0007] Preferably, the above-mentioned artificial hip joint wear testing machine also includes a fine-tuning mechanism; the fine-tuning mechanism includes a second motor, a third motor, a fourth motor, a first frame, a second frame and a cross plate; there are two cross plates, which extend along the y-axis direction respectively and the two ends of the cross plates are respectively fixed on the supporting feet; the two cross plates are symmetrically provided with positioning frames; the two ends of the second frame are respectively rotatably connected to the two positioning frames; the fourth motor is connected to the second frame, and is used to drive the second frame to rotate around the x-axis; the first frame is rotatably connected to the second frame, and the third motor is connected to the first frame, and is used to drive the first frame to rotate around the y-axis; the sensing seat is movably installed in the first frame, and the second motor is connected to the sensing seat, and is used to drive the sensing seat to rotate around the z-axis.

[0008] By adopting this technical solution: the fourth motor, the third motor and the second motor in the fine-tuning mechanism are used to realize the rotation of the sensing base on the x-axis, y-axis and z-axis respectively, so that the wear test of the sample is closer to the various movement modes of the natural hip joint, so as to obtain more comprehensive wear test data.

[0009] More preferably, the artificial hip joint wear testing machine further comprises an outer frame, which is located outside the guide column, the horizontal top plate, the first motor and the fine-tuning mechanism.

[0010] By adopting this technical solution: an outer frame is provided to realize external protection for the guide column, the horizontal top plate, the first motor and the fine-tuning mechanism.

[0011] It is further preferred that, in the above-mentioned artificial hip joint wear testing machine: the bottom of the workbench is provided with universal wheels and liftable feet.

[0012] By adopting this technical solution: universal wheels are set to achieve rolling movement of the artificial hip joint wear tester. Liftable feet are set to lift the entire workbench after the artificial hip joint wear tester moves to the specified position, so that the universal wheels leave the ground, ensuring that the workbench is stable and motionless during the test.

[0013] Compared with the prior art, this application achieves the following technical effects by adopting the above solution:

[0014] Set up comparison samples, test the samples to be tested and comparison samples simultaneously, and detect their wear degree to avoid damage other than wear during the test; set up a fine-tuning device, use the fine-tuning device above the fixture, and when installing the sample, fine-tune and calibrate the sample origin to reduce the error; use two motors to drive the sample to be tested to swing back and forth and left and right respectively, so that the sample can be tested for wear and tear, making the swinging process faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional view of the present invention, and the steel wire rope is omitted in this figure;

[0016] Figure 2 for Figure 1 Schematic diagram of the explosion structure of the fine-tuning mechanism;

[0017] Figure 3 for Figure 1 A side view schematic diagram of

[0018] Figure 4 for Figure 1 Schematic diagram of the main view.

[0019] The corresponding relationship between the reference numerals and component names is as follows:

[0020] 1. Workbench; 2. Induction seat; 3. Guide column; 4. Horizontal top plate; 5. Cam; 6. First motor; 7. Transmission shaft; 8. Spring; 9. Connecting plate; 10. Telescopic column; 11. First fixture; 12. Middle plate; 13. Comparison sample; 14. First sensor; 15. Second fixture; 16. Sample to be tested; 17. Support foot; 19. Second motor; 20. Third motor; 21. Fourth motor; 22. First frame; 23. Second frame; 24. Cross plate; 25. Positioning frame; 26. Outer frame; 27. Universal wheel; 28. Liftable foot; 29. ​​Pulley; 30. Counterweight. DETAILED DESCRIPTION

[0021] like Figure 1-4 Shown is Example 1 of the present application:

[0022] An artificial hip joint wear testing machine comprises: a workbench 1, a fine-tuning mechanism, a sensing seat 2 and an outer frame 26;

[0023] The bottom of the workbench 1 is provided with universal wheels 27 and liftable feet 28. The top of the workbench 1 is provided with four guide pillars 3, which are of equal length, extend in the vertical direction and are arranged in a rectangular shape; the top ends of the four guide pillars 3 are respectively fixed to a horizontal top plate 4; a cam 5 is installed on the horizontal top plate 4; the cam 5 is connected to the motor shaft of the first motor 6; the first motor 6 is used to drive the cam 5 to rotate; the cam 5 is connected to the upper end of the transmission shaft 7, and is used to drive the transmission shaft 7 to reciprocate in the vertical direction when the cam 5 rotates; the lower end of the transmission shaft 7 is connected to the upper end of the spring 8, and the lower end of the spring 8 is pressed against the upper end surface of the connecting plate 9; the lower end surface of the connecting plate 9 is provided with a telescopic column 10 and a first clamp 11, and the connecting plate 9 is provided with a telescopic column 10 and a first clamp 11. The middle plate 12 is connected through a telescopic column 10, and the first clamp 11 is used to clamp a comparison sample 13; a pulley 29 is provided on the horizontal top plate; the middle plate 12 is connected to a counterweight 30 through a steel wire rope; the steel wire rope passes around the pulley 29; the four corners of the middle plate 12 are movably connected to four guide pillars 3 respectively; the upper end surface of the middle plate 12 is provided with a first sensor 14 corresponding to the first clamp 11; the lower end surface of the middle plate 12 is provided with a second clamp 15, and the second clamp 15 is used to clamp a sample to be tested 16; support feet 17 are respectively provided on the outer sides of the four guide pillars 3; the sensing seat 2 is installed below the second clamp 15 through the support feet 17; and a second sensor is installed in the sensing seat 2.

[0024] The fine-tuning mechanism includes: a second motor 19, a third motor 20, a fourth motor 21, a first frame 22, a second frame 23 and a cross plate 24; wherein, the cross plates 24 have two pieces, which extend along the y-axis direction respectively and the two ends of the cross plates 24 are respectively fixed on the supporting feet 17; the two cross plates 24 are symmetrically provided with positioning frames 25; the two ends of the second frame are respectively rotatably connected to the two positioning frames 25; the fourth motor 21 is connected to the second frame 23 and is used to drive the second frame 23 to rotate around the x-axis; the first frame 22 is rotatably connected in the second frame, the third motor 20 is connected to the first frame 22 and is used to drive the first frame 22 to rotate around the y-axis; the sensing seat 2 is movably installed in the first frame 22, and the second motor 19 is connected to the sensing seat 2 and is used to drive the sensing seat 2 to rotate around the z-axis.

[0025] The outer frame 26 is located outside the guide column 3, the horizontal top plate 4, the first motor 6 and the fine-tuning mechanism.

[0026] In practice, the working process is as follows:

[0027] The comparison sample 13 is installed in the first fixture 11, and the sample to be tested 16 is installed in the second fixture 15. Then the first motor 6 is started, and the motor shaft of the first motor 6 rotates and drives the cam 5 to rotate synchronously. During the rotation process, the cam 5 moves the transmission shaft 7 downward, and the transmission shaft 7 transmits the pressure to the connecting plate 9 and the telescopic column 10 through the spring 8. The telescopic column 10 is compressed in this process. At this time, the first fixture 11 is close to the first sensor 14, pressing the comparison sample 13 and reading the pressure value of the comparison sample 13 through the first sensor 14. At the same time, the middle plate 12 moves downward under the push of the telescopic column 10, so that the second fixture 15 is close to the sensing seat 2 and presses the sample to be tested 16. The second sensor synchronously reads the pressure value of the sample to be tested 16. As a result, the comparison sample 13 and the sample to be tested 16 receive the same pressure value synchronously to achieve the effect of data comparison, thereby avoiding the interference of external sudden factors on the sample data.

[0028] In the above process: the second motor 19 drives the induction seat 2 to rotate with the z-axis as the axis; the third motor 20 drives the first frame 22 to rotate with the y-axis as the axis; the fourth motor 21 drives the second frame to rotate with the x-axis as the axis, so that the wear test of the sample is closer to the various movements of the natural hip joint. After the friction test is completed, the middle plate 12 is pulled back to the initial position by operating the counterweight block 30.

[0029] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An artificial hip joint wear testing machine, characterized in that: include: Workbench and induction stand; The workbench is provided with four guide pillars, which are of equal length, extend in vertical directions and are arranged in a rectangular shape; the top ends of the four guide pillars are respectively fixed to a horizontal top plate; A cam is installed on the horizontal top plate; the cam is connected to the first motor; the first motor is used to drive the cam to rotate; the cam is connected to the upper end of the transmission shaft, and is used to drive the transmission shaft to reciprocate in the vertical direction when the cam rotates; the lower end of the transmission shaft is connected to the upper end of the spring, and the lower end of the spring is pressed against the upper end surface of the connecting plate; the lower end surface of the connecting plate is provided with a telescopic column and a first clamp, and the connecting plate is connected to the middle plate through the telescopic column, and the first clamp is used to clamp the comparison sample; The horizontal top plate is provided with a pulley; the middle plate is connected to the counterweight block via a steel wire rope; the steel wire rope passes around the pulley; The four corners of the middle plate are movably connected to four guide pillars respectively; the upper end surface of the middle plate is provided with a first sensor corresponding to the first clamp; the lower end surface of the middle plate is provided with a second clamp, and the second clamp is used to clamp the sample to be tested; The four guide pillars are respectively sleeved with supporting feet on their outer sides; the sensing seat is installed under the second fixture through the supporting feet; the second sensor is installed in the sensing seat; The artificial hip joint wear tester further comprises an outer frame, which is located outside the guide column, the horizontal top plate, the first motor and the fine-tuning mechanism; The bottom of the workbench is provided with universal wheels and liftable feet.

2. The artificial hip joint wear testing machine as claimed in claim 1, characterized in that: It also includes a fine-tuning mechanism; the fine-tuning mechanism includes: a second motor, a third motor, a fourth motor, a first frame, a second frame and a transverse plate; There are two horizontal plates, which extend along the y-axis direction respectively and have two ends fixed on the supporting feet respectively; positioning frames are symmetrically arranged on the two horizontal plates; two ends of the second frame are rotatably connected to the two positioning frames respectively; the fourth motor is connected to the second frame and is used to drive the second frame to rotate around the x-axis; the first frame is rotatably connected in the second frame, and the third motor is connected to the first frame and is used to drive the first frame to rotate around the y-axis; the sensing seat is movably installed in the first frame, and the second motor is connected to the sensing seat and is used to drive the sensing seat to rotate around the z-axis.

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