Proximal femoral percutaneous locking dynamic hip helical blade nail

Abstract

The invention discloses a proximal femoral percutaneous locking dynamic hip helical blade nail. The proximal femoral percutaneous locking dynamic hip helical blade nail comprises a straight bone plate, a fixed sleeve, a connecting sliding sleeve, a helical nail and a tail locking screw, wherein the fixed sleeve is in fit connection with the straight bone plate; the connecting sliding sleeve is in fit connected with the inner wall of the fixed sleeve and is in the shape of steps; the diameter of the upper part of the connecting sliding sleeve is smaller than that of the lower part, a thread hold is formed in the center of the connecting sliding sleeve; a thread is arranged on the outer side of the lower part of the connecting sliding sleeve; a plurality of clamping slots are formed at the periphery of a joint of the upper part and the lower part of the connecting sliding sleeve; the helical nail consists of a head part and a rod part and is hollow form the head part to the rod part, the diameter of the head part is greater than that of the rod part, and 2 to 6 helical blades are arranged outside the head part; and the tail locking screw is inserted from the center of the connecting sliding sleeve and is in fit connection with the upper parts of the step holes on the inner walls of the centers of the connecting sliding sleeve and the rod part of the helical nail. The proximal femoral percutaneous locking dynamic hip helical blade nail is simple in structure, has the functions of sliding and pressurizing of the conventional dynamic hip screws, and has the advantages of percutaneous placement, simple surgical operation and small surgical injury and prevents the helical nail from being cut out.

Description

technical field [0001] The invention relates to a medical device, in particular to a percutaneous locking power helical blade nail for proximal femur. Background technique [0002] Dynamic hip screw is a commonly used internal fixation device in the treatment of proximal femoral fractures (femoral neck fractures, intertrochanteric fractures). There are several similar dynamic hip screws available from different orthopedic device manufacturers around the world, all of which consist of three basic components: a lag screw that is threaded into the femoral head to internally fix the proximal end of the fracture; a side plate that connects to the proximal sleeve , the proximal sleeve is socketed with the lag screw (the lag screw is allowed to slide along the axial direction of the sleeve but cannot rotate around the longitudinal axis of the sleeve), and the distal end uses cortical bone screws to connect the bone plate to the femoral shaft; The end cap is screwed into the tail o...

AI Technical Summary

Problems solved by technology

Because the screw screw rotates around its longitudinal axis to a certain extent during the process of entering the bone, in order not to limit the rotation of the screw screw in the bone and avoid damage to the bone, the current solution is to use a complex combined self-locking Helical nail scheme, however, this kind of helical nail has a complex structure, high manufacturing process requirements, and low biomechanical strength

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