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bone screw

A screw and thread technology, applied in bone implants, internal bone synthesis, medical science, etc., can solve the problem of high material ratio

Active Publication Date: 2020-10-30
克劳斯帕斯特尔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Unfortunately, there is a high percentage of materials that prove inappropriate when applying this criterion

Method used

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Embodiment Construction

[0019] The present invention relates to an optimized bone screw 1 made of allograft bone, such as figure 1 Schematically shown in , with respect to its properties in the context of osteosynthesis, in particular with regard to its breaking strength.

[0020] For this purpose, bone screws are provided with symmetrical angular or trapezoidal threads, so as not to exert any stress on the bone parts to be connected. Furthermore, since the strength of the bony connection essentially depends on the cortex of the recipient bone3 (see figure 2 ), and the contribution of the threaded connection along the cancellous bone 4 is small, the bone screws are shaped in such a way that they have as many thread turns per millimeter along the entire bolt shaft as possible in order to ensure The cortical bone 3 is connected with a correspondingly high number of thread turns. For this purpose, in case the ratio between thread depth and thread diameter is between 0.10 and 0.15, the product of this r...

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Abstract

A screw for surgical osteosynthesis procedures having an external thread and a cylindrical shank made of allograft cortical bone material, wherein the external thread is a symmetrical angular or trapezoidal thread with at least one thread turn per mm and the bone material Consists of bony units (5) and is penetrated by Haversian canals (6). According to the invention, the thread flanks (9a, 9b) delimiting the thread grooves of a symmetrical angular or trapezoidal thread are provided meeting by a thread root (8) having a length in the axial section of the bolt of 0.02 mm to within the range of 0.6 mm. In this way, bone screws (1) can be produced with higher strength, which enables less suitable donor materials to be used to produce high quality bone screws (1).

Description

technical field [0001] According to the preamble of claim 1, the invention relates to a screw for surgical osteosynthesis with an external thread and a cylindrical bolt shank made of allograft cortical bone material, wherein the external thread is a symmetrical angular or trapezoidal thread , having at least one thread turn per millimeter, and the bone material is composed of osteons and Haversian canals. Background technique [0002] If the external thread of such a screw extends over the entire longitudinal extension of the screw, it can also be called a threaded pin. If the screw also has a non-threaded head, it can also be called a bone screw. In the following, it will preferably be referred to as a bone screw, which shall also include an embodiment in the form of a threaded pin. [0003] Bone screws used in surgical osteosynthesis procedures are usually made of metal or metal alloys. Furthermore, bone screws made of resorbable materials such as polyglycolide, polylac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/86A61B17/00
CPCA61B17/866Y10S606/909A61F2002/30866A61B2017/00933A61B17/8645A61B17/863A61B17/8605A61B17/8625A61F2/28
Inventor 克劳斯·帕斯特尔
Owner 克劳斯帕斯特尔