Pneumatic percussion tool, especially for the preparation of bones
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United States of America Patent
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-
Oct 6, 1992
Grant Date -
N/A
app pub date -
Nov 13, 1990
filing date -
Apr 20, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A piston is oscillating periodically within a cylinder, propelled by compressed air. At at least one of its end positions, the piston generates a stroke that acts on a working tool, e.g. a rasp. The sizes of the piston surfaces acted upon by the compressed air and the capacities at the cylinder volumes limited by the piston are dimensioned such that the impact momentum of the piston at both end positions is essentially the same. In case of a bone rasp working tool this equal momentum of the stroke advancing the rasp into the bone and the stroke loosening the tool by retracting it, leads to an optimum working of the bone and as little stress as possible on the patient.
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