Plugs for the medullary canal of a bone
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United States of America Patent
Stats
-
Aug 17, 1982
Grant Date -
N/A
app pub date -
Jul 23, 1980
filing date -
Jul 25, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An implant 22, e.g. for locating a hip prosthesis, is placed in the medullary canal 18 of a bone 20 (e.g. the femur) and secured by pressurized cement 24. A push-fit plug 10 prevents cement penetrating down the canal. The plug can be biodegradable so that in time it dissolves away and does not modify the flexural rigidity of the cement/bone system and the risk of fractures occurring at the level of the plug is reduced. Additionally or alternatively, the outwardly facing end portion 16 of the plug may be generally conical so that the thickness of the cement increases gradually and the flexural rigidity likewise changes gradually.
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