Bi-Directional Perfusion Cannula
AssigneeMtmm Pty Ltd
InventorsRandall Moshinsky, James McMillan, Elli Tutungi
Life of this patent
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Abstract
A bi-directional perfusion cannula is provided that includes an elongate tube for insertion into an artery. The elongate tube has a first aperture at a distal end of the tube which is forward during insertion and configured so that blood can flow into the artery in the direction of insertion, an elbow formed in the elongate tube, and a second aperture formed in or slightly rearward of the elbow and configured for supplying blood into the artery in a second direction which is generally opposite to the insertion direction.
Claims20
A bi-directional perfusion cannula comprising an elongate tube for insertion into an artery, the elongate tube comprising:
- a first aperture at a distal end of the elongate tube which is forward during insertion, the first aperture being configured so that blood can flow into the artery in the direction of insertion;
- an elbow preformed in the elongate tube;
- and
- a second aperture, the second aperture being formed in or slightly rearward of the elbow and configured for supplying blood into the artery in a second direction which is generally opposite to the insertion direction;
- wherein the elongate tube has a protuberance formed at least partially on the elbow, the protuberance being configured to facilitate positioning of the cannula in the artery.
(canceled)
(canceled)
A method of inserting into an artery a bi-directional perfusion cannula comprising an elongate tube having a first aperture at a distal end for supplying blood into the artery in a direction of insertion, an elbow formed in the elongate tube, a protuberance formed at least partially on the elbow and a second aperture formed in the protuberance for supplying blood into the artery away from the insertion direction, the method comprising the steps of:
- feeding the distal end of the elongate tube into the artery until an increase in resistance to insertion is felt to indicate that the protuberance is entering the artery;
- easing the elongate tube into the artery until the elbow and the protuberance have passed into the artery and the amount of resistance reduces;
- and
- retracting the elongate tube until an increase in resistance to retraction is felt to indicate that the protuberance is abutting the artery wall and the cannula is in position.
A method of providing perfusion to a limb during peripheral artery cannulation, the method including the steps of:
- inserting a bi-directional perfusion cannula into an artery, the cannula comprising an elongate tube comprising a first aperture at a distal end of the elongate tube which is forward during insertion, the first aperture being configured so that blood can flow into the artery in the direction of insertion, an elbow formed in the elongate tube, a second aperture, the second aperture being formed in or slightly rearward of the elbow and configured for supplying blood into the artery in a second direction which is generally opposite to the insertion direction, and a manometer tube in communication with a pressure transducer, the manometer tube configured for measuring the pressure of blood flowing in the second direction;
- pumping blood through the cannula to the artery;
- and
- monitoring the pressure measured by the pressure transducer to ensure that an adequate level of blood flow to the limb is provided.
Dependencies are inferred from the claim text.