Biopsy catheter
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United States of America Patent
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-
Jul 12, 1988
Issued Date -
N/A
app pub date -
Jun 2, 1987
filing date -
Feb 14, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A biopsy catheter for use in Chorionic Villi Sampling (CVS) has a flexible cannula and an obturator for stiffening the cannula during insertion. The cannula has a curved portion to facilitate insertion and the obturator has a very flexible leading portion connected to a straight portion. The leading portion of the obturator is in the form of a coiled spring wire which lies in the curved portion of the cannula during insertion and which is longer than this curved portion. The coiled spring wire has a very low resistance to bending about its longitudinal axis so that when the obturator is withdrawn the coiled spring wire flexes to follow the curve of the cannula with minimal resistance to avoid displacement of the cannula end after it is located for collecting a sample of villi.
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