Orburator for expandable catheter
First Claim
1. A cannula effective as a surgical portal, comprising:
- an elongate flexible body having a cylindrical shaft with a longitudinal axis extending therethrough, a proximal end, and a distal end;
a flexible and elastic annular dam formed on the distal end of the shaft and having an unconstrained diameter greater than a diameter of the shaft;
a hub formed on the proximal end of the shaft, the hub having a diameter greater than the diameter of the shaft;
a lumen extending through the body along the longitudinal axis of the shaft, the lumen having a first opening at a proximal end of the hub and a second opening at the distal end of the shaft; and
a flexible, expandable sleeve removably disposed on the distal end of the shaft and covering the dam, a natural-state diameter of the flexible sleeve being less than the diameter of the shaft of the elongate flexible body such that the flexible sleeve is configured to place the dam in a constrained condition in which a constrained diameter of the dam is approximately equal to the diameter of the shaft.
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Accused Products
Abstract
Various methods and devices are provided for use of a cannula. For example, provided herein is a flexible cannula having an elongate body with an elongate shaft extending between a proximal hub and a distal dam. A lumen can extend through the cannula. The dam is in the form of a flexible annular member formed on a distal end of the shaft. The dam and the hub have diameters greater than a diameter of the shaft. A flexible, expandable sleeve is removably positioned on the distal end of the shaft of the cannula. The sleeve deformably encapsulates the dam such that the dam is folded against the shaft of the cannula. An obturator is also provided having an elongate shaft configured to be removably positioned within the lumen of the cannula. The shaft can be configured to fit within the lumen in a clearance fit.
95 Citations
16 Claims
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1. A cannula effective as a surgical portal, comprising:
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an elongate flexible body having a cylindrical shaft with a longitudinal axis extending therethrough, a proximal end, and a distal end; a flexible and elastic annular dam formed on the distal end of the shaft and having an unconstrained diameter greater than a diameter of the shaft; a hub formed on the proximal end of the shaft, the hub having a diameter greater than the diameter of the shaft; a lumen extending through the body along the longitudinal axis of the shaft, the lumen having a first opening at a proximal end of the hub and a second opening at the distal end of the shaft; and a flexible, expandable sleeve removably disposed on the distal end of the shaft and covering the dam, a natural-state diameter of the flexible sleeve being less than the diameter of the shaft of the elongate flexible body such that the flexible sleeve is configured to place the dam in a constrained condition in which a constrained diameter of the dam is approximately equal to the diameter of the shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of providing access to a surgical site, comprising:
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inserting a cannula system through an incision in a patient, the cannula system comprising an obturator having an elongate distal shaft; and a soft, flexible cannula removably disposed on the shaft of the obturator, the cannula having a cannula shaft extending between a proximal hub and a distal dam and a lumen extending through the cannula shaft from the proximal hub to an opening at a distal end of the cannula shaft, the cannula further including an elastic sleeve removably positioned over the distal end of the cannula shaft so as to cover the dam and constrain the dam against a portion of the cannula shaft; positioning the distal end of the cannula shaft and the dam within a joint space; advancing the obturator shaft relative to the cannula such that the elastic sleeve is removed from the dam and remains attached to a distal end of the obturator shaft, thereby enabling the dam to expand to an unconstrained diameter; withdrawing the obturator and sleeve from the cannula by passing the obturator shaft and the sleeve through the lumen of the cannula shaft in the proximal direction; and allowing the cannula to remain in position to enable one or more surgical tools to be passed through the lumen. - View Dependent Claims (14, 15, 16)
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Specification