Retractable cannula for surgical procedures
First Claim
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1. A retractable cannula for surgical procedures, the cannula comprising:
- a body member forming a lumen having a plurality of outwardly-biased fins extending therefrom, wherein each fin is inwardly flexible and capable of being moved inward to a converged position by insertion of a removable trocar into the lumen to allow insertion of the cannula into an incision in the body of a patient, and wherein each fin of the inserted cannula is capable of being moved inward to the converged position by insertion of a removable trocar into the lumen to allow subsequent removal of the cannula from the incision.
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Abstract
A cannula assembly having a plurality of outwardly-biased flexible fins capable of inward movement such that the fins converge upon insertion of a trocar device. The fins include a slot formed therein, with a corresponding raised feature on the trocar shaft capable of engaging the slots. Inward movement of the trocar within the cannula lumen causes the fins to converge. An additional embodiment utilizes outwardly-biased flexible fins that lock together in a closed position, with corrugated features in the fin inner surface that contact the trocar shaft such that, upon insertion of the trocar, the fins unlock and splay outward.
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Citations
14 Claims
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1. A retractable cannula for surgical procedures, the cannula comprising:
a body member forming a lumen having a plurality of outwardly-biased fins extending therefrom, wherein each fin is inwardly flexible and capable of being moved inward to a converged position by insertion of a removable trocar into the lumen to allow insertion of the cannula into an incision in the body of a patient, and wherein each fin of the inserted cannula is capable of being moved inward to the converged position by insertion of a removable trocar into the lumen to allow subsequent removal of the cannula from the incision. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
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12. A method for treatment of a patient utilizing a retractable cannula, the method steps comprising:
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providing a cannula having a lumen and a plurality of outwardly-biased inwardly flexible fins extending therefrom; inserting a trocar into the lumen to effect inward convergence of the outwardly-biased flexible fins; inserting the converged fins of the cannula into an incision in the patient; and extracting the trocar from the lumen to allow the fins to return to their outwardly-biased position within the patient, thereby compressing the surrounding tissue and forming a port through which surgical instruments may pass.
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14. A method for treatment of a patient utilizing a retractable cannula, the method steps comprising:
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providing a cannula having a lumen and a plurality of outwardly-biased inwardly flexible fins extending therefrom, the flexible fins having a locking feature that maintains the fins in a converged position; inserting a trocar into the lumen, the trocar shaft having an anti-plunging device to limit its depth within the lumen; inserting the converged and locked fins of the cannula into an incision in the patient; removing the anti-plunging device from the trocar shaft and further inserting the trocar into the lumen to effect unlocking of the fins to allow the fins to return to their outwardly-biased position within the patient, thereby compressing the surrounding tissue; and extracting the trocar from the lumen thereby forming a port through which surgical instruments may pass.
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Specification