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Intramedullary nail

A technology of intramedullary nails and internal threads, which is applied in the field of intramedullary nails for metal internal fixation devices of medical devices, and can solve problems such as shortening, bone defect damage of long tubular bones, and shortening of long tubular bones.

Inactive Publication Date: 2014-12-03
阮玉德 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the prior art are: after the fracture, some long tubular bones have bone defect damage, and the length of the long tubular bone is shortened. After the fracture is cured, the length of the long tubular bone is shortened compared with that before the fracture
Since the current intramedullary nails do not have the function of lengthening, the problem of shortening cannot be solved during the treatment of fractures; there is no intramedullary nail with the function of bone lengthening in China, that is, the intramedullary nail applied to the lengthening of long tubular bones

Method used

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Embodiment Construction

[0009] specific implementation plan

[0010] The present invention will be further described below by embodiment and in conjunction with accompanying drawing: as shown in conjunction with figure, intramedullary nail is used in the intramedullary cavity, and it is made of the intramedullary nail tube (1) that has internal thread, has the medullary thread of external thread The inner nail screw (2) and the special-shaped ratchet mechanism (3) are composed of three parts. In the initial state, most of the upper part of the intramedullary nail screw (2) with external threads is screwed into the intramedullary nail tube (1) with internal threads, and the lower part The hexagonal tail end (2a) is inserted into the ratchet hole (3b) of the special-shaped ratchet mechanism (3), and the locking nail (4) fixes the internally threaded intramedullary nail tube (1) of the intramedullary nail on the upper part of the bone marrow cavity. The ratchet mechanism (3) is fixed on the inner wall o...

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Abstract

The invention discloses an intramedullary nail and relates to an internal fixing device and a medical instrument in a human body marrow cavity. Existing intramedullary nails cannot solve the problem of shortening of bones and have no bone lengthening function when being used for treating bone fractures. The intramedullary nail mainly comprises an intramedullary nail tube (1) with an inner thread, an intramedullary nail screw (2) with an outer thread and a specially-shaped ratchet mechanism (3). In the beginning, most of the upper part of the intramedullary nail screw (2) with the outer thread is screwed in the intramedullary nail tube (1) with the inner thread, the tail end of the lower part of the intramedullary nail screw (2) with the outer thread is inserted in a ratchet hole of the specially-shaped ratchet mechanism (3), and the specially-shaped ratchet mechanism (3) drives the intramedullary nail screw (2) with the outer thread to rotate in the intramedullary nail tube (1) with the inner thread through repeated rotation of the specially-shaped ratchet mechanism (3) in a specific direction and reverse rotation of the specially-shaped ratchet mechanism (3), so that the whole intramedullary nail is lengthened, and the intramedullary nail can be used as an instrument for bone lengthening and fracture operations.

Description

technical field [0001] The invention relates to an intramedullary nail of a metal internal fixation device for a medical device in the bone marrow cavity of a human body. technical background [0002] The intramedullary nail is an internal fixation device in the bone marrow cavity of the human body, and is a commonly used medical device for the treatment of fractures. The intramedullary nail is located in the bone marrow cavity and connects the fractured long tubular bone through the intramedullary nail body and the locking nail. It has the functions of aligning the fracture fragments, fixing them, and supporting a certain gravity, so as to facilitate the growth of callus and fracture healing. . The disadvantages of the prior art are: after the fracture, some long tubular bones have bone defect damage, and the length of the long tubular bones is shortened. After the fracture is cured, the length of the long tubular bones is shortened compared with that before the fracture. ...

Claims

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Application Information

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IPC IPC(8): A61B17/72A61B17/86
CPCA61B17/7225A61B17/86
Inventor 阮玉德阮冬睿阮彦青
Owner 阮玉德
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