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Double-locking intramedullary nail structure

A technology of locking structure and intramedullary nail, which is applied in the field of intramedullary nail structure, can solve problems such as easy shaking, rotation deformity at the fracture site, and affecting bone healing, so as to avoid shaking or displacement, facilitate operation, and facilitate bone healing Effect

Inactive Publication Date: 2014-05-21
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the gap between the through hole and the screw rod, the connection between the intramedullary nail rod and the screw cannot be truly locked, and it is easy to shake, which will cause rotation deformity at the fracture site and affect bone healing.

Method used

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  • Double-locking intramedullary nail structure
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  • Double-locking intramedullary nail structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the double locking intramedullary nail structure of the present invention includes an intramedullary nail rod 1 and a screw 2 for connecting and fixing the intramedullary nail rod. The screw 2 has a screw head 21 and a screw shank 22 . A hole 11 connected to the screw 2 is provided at the proximal or distal end of the intramedullary nail rod 1, and a locking structure is provided at the position of the hole for locking the screw rod inserted into the hole. One end of the screw 2 is connected and fixed with the long bone 100 through threads to achieve locking, and the other end of the screw can penetrate into the inside of the long bone, reach the intramedullary nail rod, and easily penetrate into the hole on the intramedullary nail rod, and be locked and connected by the locking structure. Fix the rod of the intramedullary nail.

[0029] The locking structure can be in various forms, which not only facilitates the penetration of the screw i...

Embodiment 2

[0033] The locking structure in this embodiment is to fill a filling block 3 in the hole 11 on the intramedullary nail rod 1, such as a metal with less hardness, a plastic part or a rubber part, combined figure 2 Shown, others are identical with embodiment 1. The filling block has relatively small hardness and certain elasticity, is easy to insert the screw 2 and can wrap and lock the inserted screw.

[0034] Preferably, a through hole is provided on the filling block 3, and the diameter of the through hole is slightly smaller than the diameter of the inserted screw rod 22, which can interfere with the inserted screw 2 to realize the locking of the screw 2 and the intramedullary nail rod 1 The connection is fixed.

Embodiment 3

[0036] The locking structure in this embodiment is an expansion locking structure, and the others are the same as in Embodiment 1. Such as image 3 As shown, the expansion locking structure includes an expansion tube 4 set on the screw 2 and a nut 5 threadedly connected with the screw 2 . The length of the expansion tube 4 is shorter than the length of the screw rod 22, and at least the end of the screw rod 22 has threads. One end of the expansion tube 4 has several openings 41 .

[0037] The screw 2 covered with the expansion tube 4 passes through the long bone and penetrates into the hole of the intramedullary nail rod, and the larger screw head 21 of the screw 2 stretches into the intramedullary nail rod or passes to the other side of the intramedullary nail rod, and the expansion The open end of the tube faces the screw head. Screw the nut on the screw rod exposed outside the long bone, and under the action of the screw force of the nut, the screw head is brought into t...

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PUM

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Abstract

The invention discloses a double-locking intramedullary nail structure. The intramedullary nail structure comprises an intramedullary nail rod and a screw used for being fixedly connected with the intramedullary nail rod, a hole is formed in the close end or the far end of the intramedullary nail rod and used for being connected with the screw, and a locking structure is arranged at the position of the hole and used for locking a screw rod inserted into the hole. The double-locking intramedullary nail structure facilitates operation in surgery, the end, located outside the long bone, of the screw can be connected with long bone threads in a locked mode, and the end, located inside the long bone, of the screw can be locked with the intramedullary nail rod, so that double-locking connection between the intramedullary nail rod and the screw is achieved, and the intramedullary nail rod is prevented from waggling or shifting in the long bone, which is beneficial to knitting.

Description

[0001] technical field [0002] The invention relates to an intramedullary nail structure, which belongs to the technical field of medical instruments. Background technique [0003] Intramedullary nail is a relatively commonly used medical device for fracture treatment, which belongs to orthopedic internal fixation device in medical device. Intramedullary nails are generally used for internal fixation of long bone fractures such as radius, humerus, femur, and tibia. They can control the axial force line of the fracture site, promote fracture healing, and enable patients to get out of bed as soon as possible. The price of steel plate treatment is relatively low, its strength is high, and it is not easy to break like a steel plate. [0004] The intramedullary nail structure has an intramedullary nail rod, and a through hole is arranged at the proximal end or the distal end of the intramedullary nail rod. One end of the screw is connected and fixed with the long bone through...

Claims

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Application Information

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IPC IPC(8): A61B17/72
CPCA61B17/7241A61B17/725
Inventor 杨惠林罗宗平张志刚
Owner SUZHOU UNIV
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