Intramedullary pressurization fixing device for adjacent articular bone defect prosthesis reconstruction

Abstract

The invention discloses an intramedullary pressurization fixing device for adjacent articular bone defect prosthesis reconstruction. The intramedullary pressurization fixing device comprises a fixing handle main body, a pressurization shaft, a transverse locking screw and a pressurization shaft tail cap, wherein the fixing handle main body comprises a defect part and a broach part, a bone contact interface is formed at the upper end of the defect part, and the broach part is formed by longitudinally extending from the bone contact interface; the pressurization shaft is longitudinally inserted into the broach part and the defect part, the upper end of the pressurization shaft extends out of the broach part and forms a fixed end, and the lower end of the pressurization shaft is a threaded end; the transverse locking screw is used for fixedly connecting the fixed end of the pressurization shaft with a reserved bone; the pressurization shaft tail cap is screwed at the threaded end. According to the intramedullary pressurization fixing device for the adjacent articular bone defect prosthesis reconstruction, pressure stress stimulation is generated on a 'prosthesis and bony interface' through longitudinal mechanical pressurization, initial stability of intramedullary fixation of adjacent articulations is achieved, bone ingrowth in a pore interface is promoted under the action of controllable interface stress, long-term stability is achieved, and finally, on the premise that the articulation of a patient is reserved, a metal prosthesis is used for limb function reconstruction, and the risk of long-term loosening is reduced.

Description

technical field [0001] The invention relates to an intramedullary cavity pressurization and fixation device for reconstructing a bone defect prosthesis adjacent to a joint, and belongs to the field of medical instruments. Background technique [0002] The long bones of the human limbs include the humerus, radius and ulna of the upper limbs and the femur and tibia of the lower limbs. These parts are affected by many diseases, such as tumors, trauma and infection. These diseases will cause large bone loss. The reconstruction of bone structure and function has always been clinical difficulties. [0003] In some of these diseases, although the bone defect has a certain distance from the articular surface, the existing prosthesis fixation methods cannot effectively fix the prosthesis, mainly because the retained bone segment is shorter than Existing metal prosthetic stem fixation requirements. Taking tumors as an example, about 20% to 35% of primary malignant tumors are located...

AI Technical Summary

Problems solved by technology

Although this method preserves the joint, but because the plate fixation requires bone healing time, the patient cannot perform early functional rehabilitation after surgery, the knee joint is limited in flexion and extension, and the knee joint will be stiff in the long term, with poor mobility, long operation time, and poor healing. wait for the question

There is also a method of using custom-made prosthesis for reconstruction, and the custom-made prosthesis is designed according to the preoperative CT, but this method mainly has the following problems: ① It cannot be adjusted during the operation, such as the position of the osteotomy or the length. The osteotomy position is re-entered, and the installation is difficult; ②Effective intramedullary fixation is difficult. In the past, bone cement was used for fixation, but because the length of the fixable prosthesis stem is too short, the bone cement fixation is not reliable enough. The situation of reconstruction failure; with the application of 3D printing technology, short stems can be 3D printed on the surface of the prosthesis, that is, the metal-bone contact surface to achieve a porous structure. Even so, there is a considerable proportion of non-union rate, and bone growth cannot control, because according to the basic principle of bone growth, only when the bone is stimulated by stress can it show higher metabolic and repair activities

Images