3D printing total ankle joint prosthesis

Abstract

The invention discloses a 3D printing total ankle joint prosthesis. The 3D printing total ankle joint prosthesis comprises a distal tibia prosthesis and a talus prosthesis, and is characterized in that a first liner and a second liner are arranged between the distal tibia prosthesis and the talus prosthesis; the upper end of the first liner is connected with the distal tibia prosthesis through a dovetail clamping mechanism; the lower end of the first liner is connected with the upper surface of the second liner through a running fit groove; and the lower surface of the second liner is connected with the talus prosthesis by adopting a taper press-fit structure. The 3D printing total ankle joint prosthesis has the beneficial effects that the first liner that plays a role of buffering is arranged, and the high-abrasion resistance second liner that imitates ankle joint rotation is arranged, the second liner and the talus prosthesis are connected by adopting the taper press-fit structure, and the connection relation is close by means of the downward pressing acting force on the ankle joint when a human body stands upright; after being installed, the distal tibia prosthesis and the first liner cannot be misplaced and separated in a human body due to the dovetail clamping mechanism; and cross perforation and screw turning at the distal tibia are avoided, overall motion balance of the joint is repaired, and the requirement of biological mechanics of the joint is met.

Description

technical field [0001] The invention belongs to the technical field of orthopedic medical devices, in particular to a 3D printed full ankle joint prosthesis. Background technique [0002] The talus is the largest irregular bone in the human body. It is located in the ankle point and forms the tibiotalar joint (ankle joint), subtalar joint, and talar boat with the articular surface of the distal tibia, the anterior, middle, and posterior articular surfaces of the calcaneus, and the navicular bone. Joints, the anatomical structure is relatively complex. For patients with total talus lesions (including primary talus tumors, aseptic necrosis, severe comminuted fractures of the talus, etc.), it is necessary to replace the patient's total ankle joint with a 3D printed total ankle prosthesis. The traditional ankle prosthesis is often not firmly fixed due to the poor bone quality of the patient, which makes the ankle prosthesis easy to loosen, and the initial bone ingrowth of the a...

AI Technical Summary

Problems solved by technology

[0007] For the total ankle replacement schemes disclosed in the prior art, it is necessary to implant a screw tightening and fixing structure at the distal end of the tibia, which is suitable for patients with distal tibia resection, and the screw tightening and fixing structure needs to open a hole horizontally at the distal end of the tibia, and when the patient is upright When walking, the screw is supported by the screw to tighten the fixed structure, which does not fully utilize the natural function of the human body's force on the ankle joint when it is upright, and cannot well adapt to the problems of each patient. The purpose of the present invention is to provide a 3D printed full ankle prosthetic Body, suitable for patients with unresected distal tibia, using the downward pressure on the ankle joint when the human body is upright, avoiding horizontal drilling and screwing at the distal tibia, so as to restore the overall movement balance of the joint and meet its biomechanical requirements

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