CN115105267B - Bone-prosthesis interface gap device - Google Patents

Abstract

The present invention discloses a bone-prosthesis interface relative displacement device, which is prepared by 3D printing and includes a screw-in device, a spiral rod, a rotating shaft, a lever, and a trabecular prosthesis. The screw-in device is screwed into the bone marrow cavity, the spiral rod is rotated to move it downward, and the spiral rod pushes the lever to rotate the trabecular structure prosthesis along the rotating shaft, so that the trabecular prosthesis contacts or has a gap with the bone cavity membrane. By controlling the size of the gap between the trabecular prosthesis and the bone cavity membrane, the effect of the gap between the implant and the bone cavity membrane on bone integration is verified.

Description

Bone-prosthesis interface gap device

Technical Field

The invention is a device for testing the effect of the gap between implant and bone on bone integration during bone integration, and relates to the field of medical device joint prosthesis.

Background Art

Joint replacement is a surgical procedure that replaces diseased and deteriorated joints with artificial prostheses, thereby restoring the normal movement function of the human joints. It is currently the only way to solve human joint necrosis after clinical drug treatment fails. The implant will become loose after a certain period of time and need to be revised.

Loosening of joint replacement prostheses has long been a difficult problem that needs to be solved in clinical practice. Despite rapid advances in medicine, biology, and materials science, loosening treatment is still not ideal. The main reason for the failure, poor growth, and long-term growth of the prosthesis-bone interface is the lack of research on the effects of the mechanical microenvironment on tissue differentiation, damage, repair, and integration at the prosthesis-bone interface.

3D printing technology is a technology that constructs objects by printing layer by layer based on physical models and digital models. Through 3D printing technology, prostheses of any shape can be obtained, and prostheses that cannot be made by traditional processing methods can be manufactured. By adjusting the porosity, void size and shape, prostheses with strength and elasticity models close to normal bone can be obtained, which can reduce the stress shielding effect to a certain extent and improve the long-term survival rate of the prosthesis. 3D printed porous titanium alloy prostheses have a certain bone ingrowth ability and can be closely integrated with bone.

Summary of the invention

The purpose of the present invention is to provide a device for testing the influence of the gap between the implant and the bone on the bone integration when the prosthesis is implanted into the bone for bone integration.

To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a bone-prosthesis interface gap device, comprising: a screw-in device, a spiral rod, a rotating shaft, a lever, and a trabecular bone prosthesis; the structural characteristics are: the screw-in device and the spiral rod are connected together by threads, the rotating shaft is fixed to the lower end of the screw-in device, and the lever is fixedly connected to the trabecular bone prosthesis.

In order to enable the screw-in device to be screwed into the medullary cavity and remain fixed, the screw-in device is provided with an external thread.

In order to be able to control the gap between the trabecular bone prosthesis and the lining of the bone marrow cavity, the lever and the trabecular bone prosthesis are connected to a rotation axis and can rotate around the rotation axis.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a front view of Fig. 1;

FIG3 is a cross-sectional view of FIG1 ;

FIG4 is a schematic diagram of the device of the present invention after implantation into a bone;

DETAILED DESCRIPTION

The present invention is further described in detail below with reference to the accompanying drawings.

As shown in the embodiment of FIG. 1 , the bone-prosthesis interface gap device of the present invention comprises a screw-in device 1 , a spiral rod 2 , a rotating shaft 3 , a lever 4 , and a trabecular bone prosthesis 5 .

As shown in Figure 1, the screw-in device 1 is screwed into the medullary cavity of the sheep femur to fix it, and the spiral rod 2 is rotated to move it downward. The lever 3 at the other end of the trabecular prosthesis 5 is pushed by moving the spiral rod 2 downward, and the trabecular prosthesis 5 contacts the bone cavity membrane, or a gap, and the spiral rod 2 is continued to be rotated to move it downward, and the trabecular prosthesis 5 contacts and is tightly pressed against the medullary cavity lining.

Claims (1)

1. A device for studying the effect of the gap between a prosthesis and a bone on bone integration, characterized in that the device for studying the effect of the gap between a prosthesis and a bone on bone integration comprises a screw-in device (1), a spiral rod (2), a lever (3), a rotating shaft (4) and a trabecular bone prosthesis (5); the screw-in device (1) and the spiral rod (2) have external threads, the size of the threads of the spiral rod (2) is the same as the threads of the screw-in device (1), and the trabecular bone prosthesis (5) is printed by 3D titanium alloy; the screw-in device (1) and the spiral rod (2) are connected by threads, the rotating shaft (4) is connected to the lower part of the screw-in device (1), the lever (3) and the trabecular bone prosthesis (5) are connected to the rotating shaft (4) and can rotate around the rotating shaft (4); according to the lever principle, the spiral rod (2) pushes the lever (3) to rotate so that the trabecular bone prosthesis (5) rotates around the rotating shaft (4), thereby controlling the gap between the trabecular bone prosthesis (5) and the inner membrane of the thigh bone marrow cavity.