Expandable obturator and catheter assembly including same

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

A - Human Necessities

61

L

167/335, 128/127

A61L 29/00 (2006.01) A61L 29/08 (2006.01) A61L 29/16 (2006.01) A61M 25/00 (2006.01) A61M 25/10 (2006.01)

Patent

CA 2018244

An obturator 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 distributed 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.

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