Self-blunting needle assembly for use with a catheter, and catheter assembly using the same
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United States of America Patent
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-
Apr 23, 1991
Issued Date -
N/A
app pub date -
May 8, 1989
filing date -
Sep 28, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A self-blunting needle assembly (10) for use with a catheter (40), and a catheter assembly (50) attained by mounting the self-blunting needle assembly into a catheter are disclosed. The needle (12) includes a needle shaft (14) having a connector (18) thereon and a blunting device (28) including an elongate probe (30) having a retainer (32) thereon. The connector (18) engages the retainer (32) to provide a lost motion connection between the blunting device (28) and the needle (12). The needle assembly (10) is mounted within a catheter (40) by a force fit of the retainer into the hub chamber (42a) of the catheter, with the needle puncture tip (16) protruding beyond the catheter tube tip (46). After injection of the catheter by means of the needle into a patient's vein, manual withdrawal of the needle from the catheter initially shifts the needle relative to the blunting device (28) by virtue of the lost motion connector, thereby causing the elongate probe (30) to extend beyond the needle tip (16) and blunt the needle. Continued withdrawal removes the needle assembly from the catheter.
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