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US 4,588,398 AGranted
Catheter tip configuration
AssigneeWarner-Lambert Company
InventorsCharles W. Daugherty, Mohammad A. Khan, David J. Lentz, Stephen L. Thoresen
Life of this patent
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Abstract
A specific configuration for an over the needle catheter having a tapered outer wall and an angled introducer tip is disclosed. The catheter is molded of polyurethane material which is treated with a surface lubricant to ease the over the needle introduction of the catheter after venipuncture. The polyurethane material permits a minimal wall thickness for maximum flow with requisite strength and flexibility characteristics.
Claims6
A polymeric catheter for over the needle insertion into a puncture site in the human body comprising:
- an elongated hollow tubular polymeric catheter body molded of polyurethane resin having an ultimate tensile of 7,500 to 10,500 psi depending upon gauge and being treated with surface lubrication,
- a tapered end portion on said body having a first tapering portion with a relatively slight angle of between 3 degrees 30 minutes and 4 degrees 30 minutes, with respect to the axis of said body and terminating with a strong and completely circumferential chamfered lead portion at the penetrating tip to resist catheter tip damage and aid penetration at the puncture site where said lead portion extends outwardly from said first tapering portion to the distal tip of said catheter which first engages the puncture and said chamfered lead portion having a relatively blunt angle of between 25 and 35 degrees with respect to the axis of the catheter.
Dependencies are inferred from the claim text.