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Cancellous bone rivet for fixing

A technology for fixing rivets and cancellous bone, which is applied in the field of bone screws, can solve the problems of ineffective fixation, unsatisfactory effect, and unsatisfactory axial fixation effect, and achieve stable fixation and reliable axial fixation

Inactive Publication Date: 2006-11-15
LANZHOU SEEMINE SMA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the fixation effect of this bone screw is better than that of the prior art, its effect on axial fixation is still unsatisfactory, especially for the irregular outer edge of the bone condyle, it is difficult to obtain a stable fixation effect with the pressure cap of this patent
On the other hand, for the restriction of torsion, this patent is realized by using the teeth at the front end of the side leaf nail. Although the effect of this restriction is better than that of the prior art, the effect is still unsatisfactory due to the restriction on the point only. The main reason is that the shape of the patented side leaf nail determines that the other parts of the side leaf nail except the tooth end basically do not play a fixed role

Method used

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  • Cancellous bone rivet for fixing
  • Cancellous bone rivet for fixing
  • Cancellous bone rivet for fixing

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The present invention is composed of: a core needle 2 with a contracted cone 1 at one end, a side leaf needle 3 located outside the core needle 2 and matched on the slideway of the core needle, used for locking the core needle 2 and the side leaf needle 3 Compression nut 5, and special gasket 6 constitute.

[0025] Among them, core pin 2, see figure 1 There are three slides on the outside, a groove between the slides of the core needle, a through hole 7 in the center, and a hexagonal star shape with an inner hole in cross section, see figure 2 Each of the three slideways of the core needle 2 is provided with a side leaf needle 3, and the groove of the core needle has a small hole 4 communicating with the central hole. The inner hole at the other end of the core needle (the end without the frustum 1) has a section of internal thread.

[0026] see image 3 ...

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Abstract

The invention discloses a device for fixing the fracture site of cancellous bone. The present invention is a new type of orthopedic fixation device obtained by improving the Chinese invention patent application 00134945.7, which includes a core needle located inside and at least two side leaf needles located outside the core needle, and is used to lock the core needle and Compression nuts for side leaf needles. The side leaf needle of the present invention is provided with two opposite arcs, at least two-thirds of its length is a Π-shaped cross-section with two vertical edges, and the remaining part has at least one section from its end. There is a part with an external thread, and the end of the Π-shaped cross-section part has upwardly bent blade teeth.

Description

technical field [0001] The invention relates to a bone nail used in orthopedics, in particular to a device for fixing the fracture site of cancellous bone. Background technique [0002] The common instrument used to fix the fracture site is a bone screw, which is similar in shape to a commonly used screw, and the front end of the nail body is threaded (see 1, pages 133 to 146 of "Orthopedic Internal Fixation", AO Organization Technical Recommendations 3rd Edition , published by People's Publishing House; 2, "Must Read for Orthopedics Training" by Di Xunyuan et al., first edition of People's Military Medical Publishing House, 116 pages). The existing bone nail is fixed by the action of the screw thread on the nail body and the cancellous bone of the bone hole wall drilled on the bone in advance. At the same time, according to the characteristics of orthopedics, it is required that the bone screw can be pressurized during the operation, and it is also required to maintain thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/68A61B17/86
Inventor 鲍侃达国祖马悦辉廖祥文
Owner LANZHOU SEEMINE SMA CO LTD
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