Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1991-05-20
1992-06-09
Hirsch, Paul J.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604164, A61M 500
Patent
active
051203170
ABSTRACT:
A vascular/venous access device is comprised of a catheter having a stop formed at the distal end thereof, and a needle cannula having a corresponding stop formed at the distal end therof, the needle cannula being disposed within the catheter such that the catheter stop and needle cannula stop abut to prevent the catheter from traveling axially upward relative to the needle cannula during the insertion process. The catheter stop may comprise a material which softens when exposed to blood such that the stop is generally rigid during insertion of the catheter into a vein and becomes more flexible after the catheter resides in the vein. The catheter stop may comprise a region of reduced diameter and the cannula stop may comprise a region of increased diameter. The needle cannula may be disposed within the catheter with the sharp end of the needle cannula extending outwardly beyond the distal end of the catheter and the opposite end of the needle extending through the wall of the catheter between the distal end and proximal end of the catheter. A telescoping cannula assembly may be utilized wherein the distal end of an outer cannula defines the cannula stop and wherein the inner cannula may be withdrawn into the outer cannula prior to withdrawing the telescoping cannula assembly from the catheter to prevent damage to the inside of the catheter which might otherwise be inflicted by the sharp point of the inner needle cannula.
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Hirsch Paul J.
Luther Medical Products, Inc.
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