Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1990-08-14
1992-01-07
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604165, A61M 5178
Patent
active
050786873
ABSTRACT:
An over-the-needle catheter assembly is provided in which a restriction of the inner diameter of the catheter tube is formed in the proximity of the needle hub. The restriction is formed by heating a portion of the catheter tube to the softening point of the catheter material, stretching the catheter tube to cause the heated portion of the catheter tube to tighten about an inner needle or mandril, then releasing the stretching force to allow the stretched portion to relax, leaving a small gap between the inner wall of the catheter tube and the outer diameter of the insertion needle. The small gap is preferably sized to be on the order of the size of the diameter of blood cells to restrict the flow of liquids past the restriction and into the catheter hub.
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Chang Joseph
Egolf William
O'Neil Michael
Panzera Mark
Coletti Paul A.
Critikon Inc.
Gutowski A.
Yasko John D.
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