Percutaneous venous cannula for cardiopulmonary bypass
First Claim
1. A venous cannula for performing full or substantially full cardiopulmonary bypass comprisinga. a cannula having an opening at its distal end and a plurality of openings positioned around and through the cannula at its distal portion;
- b. expansion means integrally formed adjacent the distal end of said cannula, said expansion means being adapted to dilate the walls of a vascular space and space said walls away from said openings, said expansion means having memory hysteresis, whereby said expansion means has a natural repose comprising an expanded orientation; and
c. a stylet slidably positioned within said cannula and having a diameter slightly larger than said opening in the distal end of said cannula;
said stylet having a tapered distal end adapted to extend through said opening in the distal end of said cannula whereby the degree of engagement of the stylet with the periphery of the opening at the distal end of said cannula controls the expansion and contraction of said expansion means.
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Accused Products
Abstract
A cardiovascular catheter for use particularly in situations requiring varying forms of cardiopulmonary bypass. The catheter which can be introduced percutaneously has an expandable section in proximity to drainage inlets. In one form of the invention the catheter is introduced percutaneously with the expansion means collapsed after the cannula has been introduced percutaneously through the vein into the right atrium the expansion means is employed to prevent the atrium from collapsing around and possibly impeding flow through the cannula, for instance during percutaneous initiation of cardiopulmonary bypass or other venous drainage application.
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Citations
8 Claims
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1. A venous cannula for performing full or substantially full cardiopulmonary bypass comprising
a. a cannula having an opening at its distal end and a plurality of openings positioned around and through the cannula at its distal portion; -
b. expansion means integrally formed adjacent the distal end of said cannula, said expansion means being adapted to dilate the walls of a vascular space and space said walls away from said openings, said expansion means having memory hysteresis, whereby said expansion means has a natural repose comprising an expanded orientation; and c. a stylet slidably positioned within said cannula and having a diameter slightly larger than said opening in the distal end of said cannula;
said stylet having a tapered distal end adapted to extend through said opening in the distal end of said cannula whereby the degree of engagement of the stylet with the periphery of the opening at the distal end of said cannula controls the expansion and contraction of said expansion means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification