Ring type triangular synchronous control extender for thighbone

Abstract

A ring type triangular synchronous control extender for the thighbone is composed of an extender frame body, a steel needle fixing clamp connected to the extender frame body and a steel needle clamped in the steel needle fixing clamp. The extender frame body comprises a thighbone extender frame body arranged at the thighbone position. The thighbone extender frame body comprises a thighbone low hole ring, a thighbone upper hole ring arranged above the thighbone lower hole ring and a plurality of quick traction extension rods connected between the thighbone lower hole ring and the thighbone upper hole ring. The thighbone extender frame body further comprises one tubular connection rod or two tubular connection rods connected above the thighbone upper hole ring and an arc bow connected between the tubular connection rod and the thighbone upper hole ring. The extender frame body further comprises a tibia hole ring arranged at the tibia position and an elastic traction fixing rod arranged between the thighbone lower hole ring and the tibia hole ring. The extender can dynamically compensate pressure on the knee to enable the pressure on the knee to be dynamically balanced and can enable the knee to have certain mobility in an extension process.

Description

technical field [0001] The invention relates to a bone external fixator, in particular to a femur extender. Background technique [0002] The concept of bone lengthening originates from the original callus lengthening, which means that steel needles are placed at both ends of the osteotomy, and bone lengthening is applied to the bone to increase the length of the bone. Based on the concept that bone lengthening can also moderately increase the length of limbs, bone lengthening is a passive method of limb lengthening. Existing bone extenders, such as figure 1 The shown Ilizarov ring-type extender, when performing femur lengthening surgery, needles are passed through the femur and tibia respectively, and the bone is lengthened or shortened on the axis. However, the disadvantage of the above-mentioned femoral extender is that usually it can only stretch the bone without crossing the joint, and it cannot stretch and extend the soft tissues such as muscles, nerves, and blood ve...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the above-mentioned femoral extender is that usually it can only stretch the bone without crossing the joint, and it cannot stretch and extend the soft tissues such as muscles, nerves, and blood vessels crossing the knee joint synchronously. When performing cross-joint femur lengthening, the use of existing bone extenders for cross-joint traction is prone to serious complications of limb lengthening such as nonunion, joint dislocation, and knee joint dysfunction

In limb lengthening technology, although standardizing the principle of bone lengthening technology can solve the treatment needs of some limb shortening deformities, it is difficult to solve the clinical difficulties caused by complex limb shortening deformities and large limb shortening deformities

Because the traditional bone extender cannot provide direct force to soft tissues such as muscles across the joint, its force can only be transmitted indirectly through the joint; as the length of the bone continues to grow, it will inevitably cause the tension of the soft tissue across the joint to increase, thereby inducing Corresponding disturbance of joint homeostasis, which may even lead to joint dislocation or cartilage damage

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