Surgical extractor with closely angularly spaced individual filaments
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United States of America Patent
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-
Mar 5, 1996
Issued Date -
N/A
app pub date -
Jun 10, 1994
filing date -
Feb 19, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A surgical extractor for removing calculi, such as kidney stones and gall stones, from the body. The extractor includes a handle at an proximal end of the extractor with a slider for operation by a physician. At the distal end the extractor includes a plurality of pairs of wires with portions of each pair being formed along the turn of a helix. When a retaining sheath is retracted, the wires, formed of a shape memory material such as stainless steel, expand such that each pair of wires closely assumes a path along a helical turn with individual wires remaining closely adjacent. This use of plural wires for each strand multiples the number of contacts with entrapped calculi and can be provided without any deleterious effect on the reliability or size of the extractor.
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