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Bidirectional adjustable elastic intramedullary nail

An intramedullary nail and adjustable technology, applied in the field of two-way adjustable elastic intramedullary nails, can solve the problems of stress stimulation at the fracture end, slow bone mineralization speed, and long internal fixation time, so as to accelerate fracture healing and avoid stress shielding , a wide range of effects

Pending Publication Date: 2021-02-02
宋若怡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Bone plate and intramedullary nail internal fixation have been used clinically for many years to treat fractures. In the course of clinical treatment, there are many methods for fracture fixation, among which intramedullary nail fixation is one of the most commonly used methods. The traditional intramedullary nail is to fix the fractured bone on the intramedullary nail with screws, so that the intramedullary nail and the bone are integrated. However, due to the stress shielding effect of the intramedullary nail in the later stage of fracture repair, it is impossible to give suitable stress stimulation to the fracture end. Prone to delayed bone union, nonunion, slow bone mineralization, long internal fixation time, fracture after intramedullary nail removal, etc., which limit its popularization and application

Method used

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  • Bidirectional adjustable elastic intramedullary nail
  • Bidirectional adjustable elastic intramedullary nail
  • Bidirectional adjustable elastic intramedullary nail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment one, such as figure 1 As shown, a two-way adjustable elastic intramedullary nail includes a main intramedullary nail, the main nail of the intramedullary nail is a hollow structure, and the main nail of the intramedullary nail includes a proximal end 3 of the intramedullary nail, an 1. The proximal end 3 of the intramedullary nail and the main body 1 of the intramedullary nail are integrally structured, the diameter of the proximal end 3 of the intramedullary nail is larger than the diameter of the main body 1 of the intramedullary nail, and two A through power screw hole, a power bone screw is installed in the power screw hole, and the power bone screw can move axially along the power screw hole, and an upper power screw hole 4 and a lower power screw hole 13 are installed respectively. The bone screw 5 and the lower dynamic bone screw 14 are provided with two penetrating static screw holes 6 on the main body 1 of the intramedullary nail away from the proxim...

Embodiment 2

[0040] Embodiment two, such as figure 2 As shown, the difference from Embodiment 1 is that an absorbable washer 9 is provided under the lower dynamic bone screw 14, and the absorbable washer 9 is supported by the proximal end 3 of the intramedullary nail and the gradient part of the main body 1 of the intramedullary nail. The absorbable washer 9 The upper part supports the lower dynamic bone screw 14. Screw in the tail cap 2 to give the downward axial stress of the pressure regulating spring 15, and then give the upper dynamic bone screw 5 a downward axial stress, and the bone fixed on the proximal end 3 of the intramedullary nail is downwardly pressed by the pressure regulating spring 15. Axial stress, and then give the upper dynamic bone screw 5, the pressure regulating spring 15, the end cap 2, the proximal end of the intramedullary nail 3, the main body of the intramedullary nail 1, the upper static bone screw and the lower static bone screw 8 at the distal end An upward...

Embodiment 3

[0041] Embodiment three, such as image 3 As shown, the difference from Embodiment 1 is that an absorbable washer 9 is provided above the upper dynamic bone screw 5 , the upper dynamic bone screw 5 supports the absorbable washer 9 , and the upper part of the absorbable washer 9 touches the tail cap 2 . The outer side of the proximal end 3 of the intramedullary nail is provided with a guide sleeve, the guide sleeve is set in the form of a semi-guided sleeve 20, the semi-guided sleeve 20 is located above the lower power screw hole 13, and the semi-guided sleeve 20 is provided with a hole corresponding to the upper power screw hole 4. through holes. The pressure-regulating spring one 15 is set on the outside of the proximal end 3 of the intramedullary nail and the tail cap 2, one end of which abuts against the upper end of the semi-guiding sleeve 20, and the other end abuts against the convex eaves of the tail cap 2.

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Abstract

The invention discloses a bidirectional adjustable elastic intramedullary nail. The bidirectional adjustable elastic intramedullary nail comprises an intramedullary nail main nail of a hollow structure; the intramedullary nail main nail comprises an intramedullary nail near end and an intramedullary nail body which are of an integrated structure; the diameter of the intramedullary nail near end islarger than the diameter of the intramedullary nail body; a penetrating power screw hole is formed in the intramedullary nail near end; an adjusting hole is formed in the part, away from the intramedullary nail near end, of the intramedullary nail body; a power bone screw is installed in the power screw hole and can move in the axial direction of the power screw hole; a tail cap is installed on the side of the intramedullary nail near end; an elastic body is arranged between the tail cap and the power bone screw; an absorbable gasket is arranged below the power bone screw; the absorbable gasket supports the power bone screw; and an adjusting device for adjusting the stress of the fracture end is arranged on the intramedullary nail body. The stress of the fracture end can be adjusted according to specific situation of fracture, stress shielding of the fracture end is avoided, fracture healing is accelerated, delayed healing and non-healing of the fracture are reduced, and the occurrence rate of re-fracture after intramedullary nail removal is reduced.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a two-way adjustable elastic intramedullary nail. Background technique [0002] Bone plate and intramedullary nail internal fixation have been used clinically for many years to treat fractures. In the course of clinical treatment, there are many methods for fracture fixation, among which intramedullary nail fixation is one of the most commonly used methods. The traditional intramedullary nail is to fix the fractured bone on the intramedullary nail with screws, so that the intramedullary nail and the bone are integrated. However, due to the stress shielding effect of the intramedullary nail in the later stage of fracture repair, it is impossible to give suitable stress stimulation to the fracture end. It is prone to delayed bone union, nonunion, slow bone mineralization, long internal fixation time, fracture after intramedullary nail removal, etc., which limits its popul...

Claims

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Application Information

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IPC IPC(8): A61B17/72
CPCA61B17/72A61B17/725A61B2017/564
Inventor 宋文超王秋霞宋若怡李奎刘涛纪方芮永军王自力许新忠宋永枝王秋根高峻青朱爱祥蒋栋王筠蔡宏敏李忠强王永忠方跃胡金玺刘月驹廖冬发刘国辉马延辉郑波庄岩周琦石周彬赵建文沈爱东王谦高仕长胡伟军陈扬平张文龙郭晓冬石玮郭书权陈伟彭阿钦邹林张志山刘兆杰马献忠王建东李红卫吴剑宏姚刚郭永智
Owner 宋若怡
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