Expandable obturator and catheter assembly including same

Details Expandable obturator and catheter assembly including same Expandable obturator and catheter assembly including same

1989-09-20

1991-05-14

Pellegrino, Stephen C.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604265, A61M 500

Patent

active

050152386

ABSTRACT:
An oburator includes a solid substantially stiff rod of a nonhydrophilic polymer coated with a layer of a hydrophilic polyurethane which may have an antithrombogenic agent bulk distributing therein. When the hydrophilic polyurethane comes into contact with an aqueous liquid such as water, saline or a body fluid, it absorbs the liquid and expands thereby enlarging the diameter of the obturator. Another aspect of the invention is an assembly of a catheter and the obturator of the invention. When the obturator is emplaced in the catheter and brought into contact with a liquid, it expands, releases the antithrombogenic agent and contacts the lumen wall of the catheter thereby forming a seal which prevents backflow of a body fluid.

REFERENCES:
patent: 3572333 (1971-03-01), Hubert et al.
patent: 3695921 (1973-10-01), Shepherd et al.
patent: 4515593 (1985-05-01), Norton
patent: 4526579 (1985-07-01), Ainpour
patent: 4647643 (1987-03-01), Zdrahala et al.
patent: 4668221 (1987-05-01), Luther
patent: 4743629 (1988-05-01), Karakelle et al.
Barbara A. Brown, Hematology: Principles and Procedures, Lea & Febiger 1984.

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