Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1998-01-08
2000-10-03
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604162, 604164, A61M 500
Patent
active
061266418
ABSTRACT:
I describe shielded intravenous (IV) catheter insertion assemblies wherein the catheter insertion needle hub, shank and leading bevel are safely shielded by wedge impaction inside conical holders resembling syringes after use for safely controlled insertion of an IV catheter having a leading taper, a tubular body and a trailing hub attachable to a Luer-Lok. An unfilled form of the assembly consists of a hollow cone whose leading frustal end resembles that of a standard 3.0 ml. syringe with a leading Luer-Lok for reversible attachment of a flanged needle hub on a soft catheter; and encloses a modified piston which enhances delicate control of the beveled needle tip in relation to the leading taper in the catheter. The open trailing apical end snugly admits passage through of a smaller bore syringe which reversibly slip connects to the catheter insertion needle hub and successively serves as a guide for the catheter insertion needle; a reliable means for assessing accuracy of insertion and flow at successive stages of insertion without shearing the catheter or producing venous injury after initial flash-back of venous blood; and as a means for optionally obtaining an undiluted fresh blood sample. Upon retraction of the smaller bore syringe, the trailing apical end of the hollow cone provides a secure means for shielding the entire catheter insertion needle having a circular hub flange diameter greater than the external diameter of the snugly inserted small bore syringe, and greater than the internal diameter of the trailing apical end of the hollow cone at a point best suited for wedge impacting the catheter insertion needle hub when it slip disconnects from the hub of the catheter insertion needle with retraction. Alternative embodiments for prefilled IV catheters and catheters with winged hubs are specified.
REFERENCES:
patent: 4917669 (1990-04-01), Bonaldo
patent: 5007901 (1991-04-01), Shields
patent: 5401250 (1995-03-01), Shields
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