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Intramedullary nail locking mechanism

A technology of intramedullary nails and locking nails, which is applied in the field of intramedullary nail locking mechanisms, can solve problems such as adverse reactions and fretting corrosion of the surrounding tissues of the human body, and achieve the effects of preventing fretting corrosion, increasing reliability, and preventing adverse effects

Pending Publication Date: 2018-06-29
TRAUSON CHINA MEDICAL INSTR COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the existing intramedullary nails are assembled and used, because the intramedullary nails and screws are all metal, the metal and metal are in rigid contact. After a long time, it is easy to wear and form metal chips, resulting in fretting corrosion, which causes damage to the surrounding tissues of the human body. Adverse reactions

Method used

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  • Intramedullary nail locking mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as Figure 1-2 As shown, it is the intramedullary nail locking mechanism of this embodiment, which includes a main nail 1, a lag screw 2 and a locking nail 3, the main nail 1 is a long shaft with a cavity inside, and the lag screw 2 is arranged on the main nail 1 near the tension hole, the tension hole is a non-circular hole, and the locking nail 3 is set in the locking hole at the distal end of the main nail 1. The outer wall of the main nail 1 has a decompression surface 5 extending along the elongation direction of the main nail 1 .

[0029] An annular liner 4 is placed in the tension hole and the keyhole, the inner wall and the outer wall of the liner 4 are smooth, and the liner 4 resists the tension hole or the keyhole. The liner 4 is made of polyethylene, or polyetheretherketone or polylactic acid that can be absorbed and degraded by the human body.

Embodiment 2

[0031] Such as Figure 3-4 As shown, it is the intramedullary nail locking mechanism of this embodiment, which includes a main nail 1, a lag screw 2 and a locking nail 3, the main nail 1 is a long shaft with a cavity inside, and the lag screw 2 is arranged on the main nail 1 near the tension hole, the tension hole is a non-circular hole, and the locking nail 3 is set in the locking hole at the distal end of the main nail 1. The outer wall of the main nail 1 has a decompression surface 5 extending along the elongation direction of the main nail 1 .

[0032] An annular liner 4 is placed in the tension hole and the keyhole, and one end of the liner 4 has a protruding step 41. The tension hole and the keyhole are divided into a head end and an end according to their pointing directions, and the tension hole and the keyhole There is a notch adapted to the step 41 at the head end of the pad. When the pad 4 is arranged in the tension hole or the lock hole, the step 41 is stuck in th...

Embodiment 3

[0035] Such as Figure 5-7 As shown, it is the intramedullary nail locking mechanism of this embodiment, which includes a main nail 1, a lag screw 2 and a locking nail 3, the main nail 1 is a long shaft with a cavity inside, and the lag screw 2 is arranged on the main nail 1 near the tension hole, the tension hole is a non-circular hole, and the locking nail 3 is set in the locking hole at the distal end of the main nail 1. The outer wall of the main nail 1 has a decompression surface 5 extending along the elongation direction of the main nail 1 .

[0036] An annular liner 4 is placed in the tension hole and the keyhole, the inner wall and the outer wall of the liner 4 are smooth, and the liner 4 resists the tension hole or the keyhole. The liner 4 is made of polyethylene, or polyetheretherketone or polylactic acid that can be absorbed and degraded by the human body.

[0037] The main nail 1 is formed by plugging two nails. One end of the insertion part on the main nail 1 h...

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Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to an intramedullary nail locking mechanism. The intramedullary nail locking mechanism comprises a main nail, a lag screw and a lock nail, wherein the main nail is a long-axis rod with a cavity inside, the lag screw is arranged in a pull hole in the near end of the main nail, the lock nail is arranged ina lock hole in the far end of the main nail, and pads preventing rigid contact are arranged the pull hole and the lock hole. The intramedullary nail locking mechanism avoids rigid contact in the use process, so that the use safety is improved.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an intramedullary nail locking mechanism. Background technique [0002] When the bones of the human body are fractured, intramedullary nails are usually used to connect the broken bones. Intramedullary nails generally refer to long steel nails placed in the bone marrow cavity. For example, for the femur and tibia of the lower limbs, after opening a wound at one end of the bone and inserting the intramedullary nail, screws are installed at the proximal end and the distal end of the intramedullary nail respectively to prevent the rotation and shortening of the bone. When the existing intramedullary nails are assembled and used, because the intramedullary nails and screws are all metal, the metal and metal are in rigid contact. After a long time, it is easy to wear and form metal chips, resulting in fretting corrosion, which causes damage to the surrounding tissu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/72A61L31/04A61L31/06A61L31/14
CPCA61L31/048A61L31/06A61L31/14A61L31/148A61B17/7241A61B17/725C08L23/06C08L61/16C08L67/04
Inventor 陈长胜方建辉
Owner TRAUSON CHINA MEDICAL INSTR COMPANY
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