Osteosynthetic force transmitting member
OwnerAnton Harleinventor
Life of this patent
Estimating the term…
Abstract
An osteosynthetic member, such as a bone screw, is provided with a weakened zone which breaks in response to the application of excessive bending, shearing and/or other stresses. The location of the weakened zone is selected in such a way that it is spaced apart from a bone into which an externally threaded section of the member extends. This ensures that the protruding part of the externally threaded section can be engaged by pliers, by a screwdriver or another suitable tool to withdraw the externally threaded section from the bone.
Claims25
An osteosynthetic force transmitting member comprising a first section arranged to force-lockingly engage a bone;
- a second section including means for coupling the force transmitting member to an osteosynthetic accessory;
- and an intermediate section disposed between said first and second sections and constituting a part of the force transmitting member weaker than adjacent portions of the first and second sections so that such intermediate section is more likely to break under overload conditions than said first and second sections in response to the application of forces to the force transmitting member, said intermediate section including first and second components which are of one piece with said first and second sections, respectively, and which establish between themselves a breakage zone said first component being accessible upon breakage of the force transmitting member at said breakage zone for direct engagement by a displacing tool serving to move said first section relative to the bone.
An elongated osteosynthetic force transmitting member including a first end section engageable with a bone, a second end section engageable by a displacing tool to move said first end section relative to the bone, and an intermediate section having a first component of one piece with said first end section and a second component of one piece with said second end section and with said first component, said intermediate section further having a weakened portion disposed between said first and second components and being less resistant to breakage than the adjacent portions of said end sections and said first and second components, said first component of said intermediate section being configurated and dimensioned to be accessible to and to be engageable by an implement for the purpose of moving said first end section relative to a bone while said first end section engages such bone and subsequent to breakage of said weakened portion of said intermediate section.
Dependencies are inferred from the claim text.