Novel bone lengthening intramedullary nail

Abstract

The invention discloses a novel bone lengthening intramedullary nail. A main nail of the novel bone lengthening intramedullary nail is composed of an upper nail body and a lower nail body, the upper nail body and the lower nail body are both of a hollow structure and are connected through a connecting pin, a long sliding groove is formed in the upper part of the lower nail body in the axial direction, the connecting pin can slide up and down along the long sliding groove, and the diameter of the upper nail body is larger than that of the lower nail body. A lengthening device is installed between the interior of the pipe wall of the upper nail body and the upper end of the lower nail body, a dynamic screw hole and a static screw hole are formed in the upper nail body, a fixing screw hole isformed in the lower nail body, an adjusting hole is formed in the lower section of the lower nail body, and a dynamic bone screw, a static bone screw and a fixing bone screw are correspondingly installed in the dynamic screw hole, the static screw hole and the fixing screw hole. The dynamic bone screw can move up and down along the dynamic screw hole, a tail cap is installed at the top end of theupper nail body, and a first elastic body is arranged between the tail cap and the dynamic bone screw. Compared with a bone lengthening mode of an external fixation support method, the defects of nail path infection, joint dysfunction, complex operation and the like can be reduced, operation and control are easy, and complications of the bone lengthening mode of the external fixation support canbe effectively avoided.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a novel bone-extending intramedullary nail. Background technique [0002] Bone lengthening surgery is an effective surgical modality for the treatment of shortened limbs. The conventional treatment method is to close and truncate the long bones of the lower limbs at the metaphysis, and use extended external fixators to fix the upper and lower ends of the bones, and gradually lengthen them around one week after the operation, usually by 0.5-1.0mm per day. During the lengthening process, the tissue regeneration potential of the body is continuously stimulated to form new bone, so as to achieve the purpose of lengthening the limb. However, there are many disadvantages at the same time, such as the complex structure of the extended external fixation bracket, the exposure of the fixation pin to the body surface, the complicated operation, the long time of wearing the frame after the op...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of bone extension intramedullary nail to solve the problem that when the existing magnetic bone extension intramedullary nail is used in the above background technology, the diameter of the nail body is too large, which is not suitable for patients whose medullary cavity diameter is not thick. The magnetic driving force is too small, and when the extension length is greater than 5-6cm, it will fail to drive, resulting in the termination of the extension. It is necessary to take out the bone extension intramedullary nail, and use other methods to extend it again after surgery; Insufficiencies such as stress shielding, slow mineralization of prolonged bone healing, and surgical risks

Images