Structure improvement of an orthopaedic implant of an artificial knee joint

摘要

A structure improvement of orthopaedic implant for connecting a distal femur and a proximal tibia, and a stem was implanted into the proximal tibia, in which formed to allow inter-engagement between the stem of the tibia and the structure improvement of orthopaedic implant. The structure improvement of orthopaedic implant includes a tibial baseplate, a tibial insert, and a reinforcement. The tibial baseplate forms a recess having a bottom that has a central portion defining a through hole extending through the tibial baseplate. The tibial insert includes a support, a through region, and a projection, wherein an end of the tibial insert forming the projection corresponding to the recess of the tibial baseplate for press-fitting to the tibial baseplate. The reinforcement is inset in the tibial insert and includes a sleeve and a bolt. As such, the advantages of stable coupling includes force resistance, avoids insert loosening then extends prosthetic longevity.

主权项

1. An structural improvement of an orthopaedic implant of an artificial knee joint, comprising:
a stem implantable into a proximal tibia, wherein an end of the stem has a coupling hole with an inner thread; a tibial baseplate, in which is formed a recess having a bottom that has a central portion defining a through hole extending through the tibial baseplate, and the end of the stem is inserted in the through hole, and the through hole has a top circumference that defines a circumferential groove extending outward, the recess has a side wall defining a retention slot; a tibial insert including a support and a projection, wherein an end of the tibial insert forms the projection, which corresponds; to the recess of the tibial baseplate and for press-fitting to the tibial baseplate, a retention pawl is formed on one side of the projection and is engageable with the retention slot of the tibial baseplate, and wherein the support is formed on an opposite end of the tibial insert, and a through region, formed in the support, extends through the tibial insert, wherein the through region includes a bore and an accommodating hole, wherein the accommodating hole is disposed in communication with; the bore, and the diameter of the accommodating hole is greater than the diameter of the bore, and the tibial insert forms two curved surfaces on opposite sides of the support to support contact and rolling; and a reinforcement fitted in the accommodating hole and comprising a sleeve and a bolt, wherein a first end of the sleeve forms a first opening, and a second end of the sleeve forms a stop with a second opening, wherein the first opening communicates with the second opening, and the bolt is movably; received in the sleeve, wherein the bolt comprises a bolt head and a bolt body, and the diameter of the bolt head is greater than the diameter of the second opening and the diameter of the bore, and the diameter of the bolt body is smaller than the diameter of the second opening, and the bolt body is in threading engagement with the inner thread of the coupling hole of the stem to drive the sleeve of the reinforcement to project beyond an end of the tibial insert for fitting into the groove of the tibial baseplate.