Connector for fractured bones
OwnerArtur Fischer, Wolfgang Kramerinventors
Life of this patent
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Abstract
A connector for osteosynthesis, especially for fastening bone fragments comprises a plug sleeve and a screw engageable in the plug sleeve, the plug sleeve being formed of a viscoplastic, tissue-compatible plastics and having a thread shape on its outer surface. The plug sleeve can be slightly expanded at its end facing the head of the screw and also expanded to a greater extent at its other end, so that simple assembly and firm clamping in the bone tissue is achieved. It is possible to monitor the position of the plug sleeve in the bone constantly during assembly on an X-ray screen in conjunction with a metallic screwdriver or a measuring scale provided on the screwdriver for screwing the sleeve into the bone.
Claims10
A connector for fractured bones, comprising a plug sleeve adapted for inserting into a bore formed in a fractured bone for bridging the fracture thereof, and having a leading portion adapted to be located in one bone fragment and a trailing portion adapted to communicate with the other bone fragment;
- an expander screw insertable and engageable in said plug sleeve, said plug sleeve having an outer surface having a shape of a thread, said sleeve being expandable at said leading portion and at said trailing portion, said screw having a head which is faced by said trailing portion in assembly;
- and expansion means provided at said trailing portion and said leading portion, respectively, the expansion means at said trailing portion being able to open said trailing portion to a lesser degree that the expansion means at said leading portion.
A connector for fractured bones, comprising a plug sleeve adapted for inserting into a bore formed in a fractured bone for bridging the fracture thereof, and having a leading portion adapted to be located in one bone fragment and a trailing portion adapted to communicate with the other bone fragment;
- an expander screw insertable and engageable in said plug sleeve, said plug sleeve having an outer surface having a shape of a thread, said sleeve being expandable at said leading portion and at said trailing portion, said screw having a head which is faced by said trailing portion in assembly;
- and expansion means provided at said trailing portion and said leading portion, respectively, the expansion means at said trailing portion being able to open said trailing portion to a lesser degree that the expansion means at said leading portion, the expansion means at said leading portion being formed by at least one first longitudinal slot extending from a leading end of said sleeve over a part of its length, and the expansion means at said trailing portion being formed by at least one second longitudinal slot extending from a trailing end of said sleeve over a part of its length and being shorter than said first longitudinal slot.
A connector for fractured bones, comprising a plug sleeve adapted for inserting into a bore formed in a fractured bone for bridging the fracture thereof, and having a leading portion adapted to be located in one bone fragment and a trailing portion adapted to communicate with the other bone fragment;
- an expander screw insertable and engageable in said plug sleeve, said plug sleeve having an outer surface having a shape of a thread, said sleeve being expandable at said leading portion and at said trailing portion, said screw having a head which is faced by said trialing portion in assembly;
- and expansion means provided at said trailing portion and said leading portion, respectively, the expansion means at said trailing portion being able to open said trailing portion to a lesser degree that the expansion means at said leading portion, the expansion means at said leading portion being formed by two opposing first longitudinal slots extending from a leading end of said sleeve over a part of its length, and the expansion means at said trailing portion being formed by two opposing second longitudinal slots extending from a trailing end of said sleeve over a part of its length and being shorter than said first longitudinal slots.
Dependencies are inferred from the claim text.