Mechanical bone tamping device for repair of osteoporotic bone fractures
First Claim
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1. A mechanical bone tamping device for forming cavities in soft cancellous bone, said device comprising at least two elongate arms, and a mechanical spreading mechanism connected to each of the arms, for spreading the arms apart, said mechanism and said arms being adapted to be passed, when the arms are not spread apart, through a cannula into a hole formed in the bone.
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Abstract
A mechanical bone tamping device for osteoporotic repair include a pair of arms mounted on a spreading mechanism such as a screw jack. The mechanism is introduced into a small hole in a vertebra through a cannula, and is then operated to spread the arms apart, forming a cavity which may be filled with cement to fortify the vertebra.
148 Citations
5 Claims
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1. A mechanical bone tamping device for forming cavities in soft cancellous bone, said device comprising
at least two elongate arms, and a mechanical spreading mechanism connected to each of the arms, for spreading the arms apart, said mechanism and said arms being adapted to be passed, when the arms are not spread apart, through a cannula into a hole formed in the bone.
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4. A method of forming a cavity in soft cancellous bone, said method comprising steps of
forming a hole in said bone, introducing a cannula into the hole, inserting a mechanically expandable tool into the hole through the cannula, and expanding the tool in the hole to form an enlarged cavity within the bone.
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5. A method of stabilizing a bone weakened by osteoporosis, said method comprising steps of
forming a hole in said bone, introducing a cannula into the hole, inserting a mechanically expandable tool into the hole through the cannula, expanding the tool in the hole to form an enlarged cavity within the bone, collapsing the tool, withdrawing the tool through the cannula, injecting bone cement through the cannula so as to fill the cavity, and allowing the cement to harden.
Specification