Unilateral two-arm adjustable two-way dual-power bone lengthening pressurized locking external fixator

Abstract

The invention provides a unilateral two-arm adjustable two-way dual-power bone lengthening pressurized locking external fixator and belongs to the technical field of bone treatment instruments. The external fixator aims at solving the problem of limb shortening caused by lower limb thighbone large-segment splintered fracture long treatment concurrent large-segment bone defects. The external fixator comprises two or three or four steel nail splint linked clamps arranged between a main arm threaded rod and an auxiliary arm threaded rod side by side. The positions of upper steel nail splints and lower steel nail splints of the steel nail splint linked clamps on vertical adjustment threaded rods are adjusted through nuts. Upper end holes of connecting plates are connected with the auxiliary arm threaded rod, the positions of the connecting plates on the auxiliary arm threaded rod are adjusted through nuts on the two sides, lower end holes of the connecting plates are connected with the vertical adjustment threaded rods, chutes are formed in the main arm threaded rod, and convex plates are in sliding fit with the chutes. A power nut is arranged between every two adjacent convex plates. The positions of the convex plates on the main arm threaded rod are adjusted through the power nuts. The convex plates are fixed to the main arm threaded rod through screws after the positions are adjusted. The external fixator is mainly used for bone injury treatment.

Description

technical field [0001] The present invention relates to a bone lengthening external fixator, in particular to a single-sided double-arm adjustable bidirectional dual-power bone lengthening pressurized locking external fixator, which is used for the treatment of bone defects, bone lengthening and deformity correction of lower limbs. It belongs to the technical field of bone therapy equipment. Background technique [0002] At present, there is no unilateral double-arm adjustable dual-power two-way femoral extension compression locking external fixator for the treatment of large comminuted fractures of the femur, long-term treatment, bone fracture bone resorption, and large bone defects. Internal fixation or existing external fixation bone extension (bone transfer) brackets are not applicable, and some have been cured for as long as 8 years, causing pain to the patient, and some require amputation. In order to solve this problem, a single-arm external fixation appears on the ma...

AI Technical Summary

Problems solved by technology

Internal fixation or existing external fixation bone extension (bone transfer) brackets are not applicable, and some have been cured for as long as 8 years, causing pain to the patient, and some require amputation. In order to solve this problem, a single-arm external fixation appears on the market. Fixed extension (bone transport) stents (eg Figure 17 As shown), the main disadvantages of its existence are: 1. The groove channel designed to wear the steel nail and fix the steel nail does not conform to the physiological anatomy of the femur. , the axis of the long tubular bone of the femur is arc-shaped (such as Figure 11 As shown), the designed single-arm external fixation extension (bone transfer) bracket is designed with 3 pieces of steel nail clips and nail slots, and each piece can be fixed with 2 steel nails. The slots are all on a horizontal line, and the nails The steel nails of several sets of splint plates for external fixation cannot all be worn on the axis of the femur, the proximal and distal ends of the femur can be nailed on the axis of the femur, and the middle nails of the femur can be worn on the soft tissue behind the femur, or behind the femur On the cortical bone; 2. The nail clip has no forward or backward adjustability, and cannot complete osteotomy extension (bone transfer)

[0004] However, it is not suitable for large segmental bone defects caused by comminuted bone and long-term bone resorption in the femoral part of the thigh, because the anatomical feature of the thigh is rich in soft tissue, and there are large arteries, veins, and sciatic nerves in the inner thigh. The femur is pierced with a cross needle, closed from the outside of the thigh through the femur, and pierced through the skin on the inside. There are large arteries, veins, and nerves on the inside of the thigh. Blood vessels must be avoided. Several steel needles cross the outside of the thigh and penetrate through the femur. It is very dangerous to get out of the skin, and it is difficult to pass the needle. When the anatomical position of the individual arteries and veins varies, the steel needle pierces the large blood vessel, which can cause massive bleeding, especially in the osteotomy and extension of the lesser trochanter of the femur, and in the greater trochanter of the femur. , close to the pelvis and near the groin (the femoral groove has the femoral artery and the femoral vein, and the femoral nerve is both a large blood vessel). It cannot be fixed with a full ring but can only be fixed with a half ring. It is not as stable as full-circle cross-pinning), external fixation cross-needling can cause the danger of puncturing the inner thigh neurovascular, after external fixation, carrying several metal rings and half-rings on the thigh takes up a lot of space, both sitting and lying are affected. The proximal half of the thigh cannot be pierced with steel needles at a large angle, so the fixation is not firm and the treatment effect is not reliable, so it is not applicable

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