Biopsy assembly
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United States of America Patent
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N/A
Issued Date -
Jul 1, 2004
app pub date -
Dec 12, 2003
filing date -
Dec 12, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An access cannula (34) is supported by a cannula handle (22) and receives an introduction stylet (40) for insertion into a bone (44). An inner cannula (66) is inserted into the access cannula (34) and advanced into the bone (44) to cut and retrieve a specimen (74). The distal end (70) of the inner cannula (66) includes a swaged portion with a non-deformable sidewall (76) having a frustoconical interior surface (78) extending radially inwardly at a predetermined angle from the distal end (70) to a biopsy opening (80) having an annular cutting edge (84). The cutting edge (84) has opposed cusps (88) extending therefrom. A syringe (100) applies a vacuum to the inner cannula (66) for retaining the biopsy specimen in the inner cannula (66) and an obturator (102) removes the biopsy specimen from the inner cannula (66). The access cannula (34) remains in position and creates an open passage for access to the site (46) for performing other procedures.
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