CN1302757C - Implantation body protective equipment for bone implantation type artificial limb - Google Patents

Abstract

The invention relates to an implant protection device for bone implant prosthesis, which belongs to the field of biomedical engineering. In order to solve the problem that the structural design of the existing bone-implanted prosthesis does not consider overload protection. The invention discloses an implant protection device for bone implant prosthetics, which comprises an implant, an upper connecting body, a lower connecting body, a spherical slider and a compression nut connected in sequence, and an implant fixed on the lower connecting body. Prosthesis connecting pipe, the contact surface between the upper connecting body and the lower connecting body is a spherical surface, the contact surface of the spherical slider and the lower connecting body is a spherical surface concentric with the contact surface of the upper and lower connecting body, through the spherical slider and the compression The nut connects the upper and lower connecting bodies, and makes the friction moment between the contact surfaces of the upper and lower connecting bodies smaller than the allowable bending moment of the protruding end neck of the implant body. The invention has an overload slipping function, and when the external force received by the prosthesis exceeds a limit value, a certain amount of relative sliding occurs between the prosthesis and the implant, thereby protecting the implant and the bone of the residual limb from being damaged.

Description

Implant protection device for bone implant prosthesis

technical field

The invention relates to an implant protection device for a bone-implanted artificial limb, belonging to the field of biomedical engineering.

Background technique

The existing traditional prosthesis is connected to the prosthesis through a socket made of resin material that matches the patient's residual limb. The prosthesis transmits force through the soft tissue and the socket, which does not conform to the laws of human biomechanics. Due to the poor air permeability of the socket, The interface environment is harsh, the skin of the residual limb is easily damaged, and the socket must be replaced frequently due to muscle atrophy of the residual limb. Bone-implanted prosthesis is a new technology in the field of prosthetics assembly. This assembly method does not require a socket. At the same time as the amputation operation, an implant made of biocompatible metal materials is implanted into the stump bone , to achieve bony tendon fusion, and the other end of the implant is sealed percutaneously and protruded out of the body to connect with the prosthesis. At present, only Sweden has reported this kind of prosthesis in the world and it has been tried clinically. However, because the structural design of the connecting body does not consider the overload protection problem, when the prosthesis receives a large external force, the implant often bends and collapses. fracture.

Contents of the invention

The purpose of the present invention is to solve the problem that the structural design of the existing bone-implanted prosthesis does not consider overload protection.

The invention provides an implant protection device for bone implant prosthetics, which comprises implants connected in sequence, an upper connector, a lower connector, a spherical slider and a compression nut, and fixed on the lower connector The prosthesis connecting tube on the body is characterized in that: the contact surface of the upper connecting body and the lower connecting body is a spherical surface, the contact surface of the spherical slider and the lower connecting body is a spherical surface concentric with the contact surface of the upper and lower connecting body, The upper and lower connectors are connected by the spherical slider and the compression nut, and the pressure between the spherical contact surfaces of the upper and lower connectors is adjusted through the compression nut, so that the frictional moment between the contact surfaces of the upper and lower connectors is smaller than that of the protruding end neck of the implant allowable bending moment.

The diameter d ₂ of the neck of the upper connecting body is smaller than the diameter d ₁ of the neck of the extending end of the implant, and the allowable bending moment of the neck of the upper connecting body is smaller than the allowable bending moment of the neck of the extending end of the implant , the friction moment between the contact surfaces of the upper and lower connecting bodies is smaller than the allowable bending moment of the neck of the upper connecting body.

The implant protection device of the present invention has an overload slipping function. When the external force received by the prosthesis exceeds a limit value, a certain amount of relative sliding occurs between the prosthesis and the implant, thereby protecting the implant and the bone of the residual limb from being damaged. .

Description of drawings

Fig. 1 is a schematic structural view of an implant protection device according to the present invention.

Detailed ways

Further illustrate the present invention below in conjunction with accompanying drawing.

As shown in Fig. 1, the implant protection device of the present invention includes an implant 1, an upper connecting body 2, a lower connecting body 3, a spherical slider 4 and a compression nut 5 connected in sequence, and fixed on the lower The prosthesis connecting pipe 6 on the connecting body 3, the upper end of the upper connecting body 2 is provided with an inner hexagonal hole, which is used to connect with the outer hexagonal head at the extension end of the implant body 1, and the hole wall of the inner hexagonal hole has a Longitudinal groove, the outer hexagonal head of implant body 1 protruding end is clamped with bolt by the ear end of upper connecting body end. The lower end of the upper connector 2 is a hemispherical head with a radius R; the upper end of the lower connector 3 is a ball socket with a radius R that contacts the concentric ball head of the upper connector 2; the upper and lower connectors pass through the spherical slider 4 and the compression nut 5 connection; the spherical surface on the spherical slider 4 and the spherical surface of the upper connecting body are concentric spherical surfaces; the pressure between the spherical contact surfaces of the upper and lower connecting bodies is adjusted by the compression nut 5, so that the frictional moment generated between the contact surfaces is smaller than that of the implant 1 The allowable bending moment of the extended end neck is also smaller than the allowable bending moment of the upper connecting body 2 neck. When the implant and upper connecting body are made of the same material, the diameter d ₂ of the neck of the upper connecting body should be smaller than the diameter d ₁ of the protruding neck of the implant, so that the allowable bending moment of the upper connecting body neck is less than The permissible bending moment of the extended end neck. Therefore, when the bone implant prosthesis is subjected to a large external force, the spherical contact surface of the upper and lower connectors slips first, thereby protecting both the implant and the upper connector from bending damage.

Claims (2)

1. An implant protector for bone implanted prostheses, comprising an implant (1), an upper connector (2), a lower connector (3), a spherical slider (4) and a presser connected in sequence Tighten the nut (5), and the prosthesis connecting pipe (6) fixed on the lower connecting body (3), it is characterized in that: the contact surface of the upper connecting body (2) and the lower connecting body (3) is a Spherical surface, the contact surface of the spherical slider (4) and the lower connector (3) is a spherical surface concentric with the contact surface of the upper and lower connectors, and the upper and lower connectors are connected by the spherical slider (4) and the compression nut (5) Get up, and adjust the pressure between the spherical contact surfaces of the upper and lower connectors through the compression nut (5), so that the frictional moment between the contact surfaces of the upper and lower connectors is less than the allowable bending moment of the implant (1) protruding from the end neck. 2. The implant protection device according to claim 1, characterized in that: the diameter d ₂ of the neck of the upper connecting body (2) is smaller than the diameter d ₁ of the protruding end neck of the implant (1), Moreover, the allowable bending moment of the neck of the upper connector (2) is less than the allowable bending moment of the neck of the protruding end of the implant (1), and the frictional moment between the contact surfaces of the upper and lower connectors is smaller than that of the upper connector (2). Allowable bending moment for the neck.