Self controlled intramedullary bone lengthening device

Abstract

The invention relates to a self-control intramedullary bone prolong device, which is formed by left fixing end (1), left connecting sheath (3), motor (4), motor support (5), copper sheath (60, guide key (7), outer cylinder (8), inner cylinder (9), central screw (10), and right fixing end (12). When in surgery, it can be planted into intramedullary to connect the bone with pin; when the motor rotates, the central screw rotates to axially move the inner cylinder to prolong the bone; when the motor stops, the device is stopped to fix the bone; when the motor rotates reversely, it can contract the bone. The invention has little hurt on human, while its length can be adjusted and the minimum drawn length in one time is 0.1mm.

Description

technical field [0001] The invention relates to a medical device, in particular to a self-controlled intramedullary bone extension device. Background technique [0002] The lengthening technique used in the treatment of limb disparity originated from Codivilla's conception of bone lengthening, and has been improved and perfected by many scholars, gradually forming today's situation. And gradually extended to bone defect treatment, deformity correction and body heightening surgery. Traditional bone lengthening is mainly realized by external fixator, which is regarded as the key technology and equipment in bone lengthening, so external bone fixators with various spatial configurations and functions are derived. However, no matter how the external fixator is improved, the basic principle that it is placed on the surface of the limb and directly stretched outside the body has not changed. Therefore, the needle tract infection caused by the external fixator, a large number of sk...

AI Technical Summary

Problems solved by technology

[0004] The disadvantages are: limited extension range, long treatment period, many steel needle scars, difficult operation, all manual operation, low operation accuracy, and inherent complications of bone lengthening.

[0006] Its disadvantage is that the fixation stability of the extender is very poor, and it is generally not suitable for adult operations, and it is mostly used for children.

Although this device has the advantages of not damaging nerves and blood vessels, avoiding wound infection and swelling of limbs, and reducing skin scars, its disadvantages are: troublesome operation, patients cannot implement extension by themselves, and medical personnel need to use traction instruments to help each extension, and The traction force is difficult to control accurately, so the practicality is extremely poor

[0008] The common disadvantages of existing bone extenders are that they all use manual external force control to realize the stretching of the extender, the control precision of stretching is low, the operation is difficult, and the risk of misoperation in clinical application is extremely high

Moreover, it is easy to interfere and destroy blood circulation, which is not conducive to bone healing in the extended area.

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