Penetrating instrument having an expandable anchoring portion
First Claim
1. A penetrating instrument for penetrating an anatomical cavity wall to gain access to an anatomical cavity comprisinga cannula having a distal end for being disposed in the anatomical cavity and a proximal end for being disposed externally of the anatomical cavity;
- a penetrating member disposed in said cannula and having a distal end for penetrating the anatomical cavity wall; and
an expandable portion disposed along said cannula a predetermined distance from said cannula distal end, said expandable portion being biased outwardly in a lateral direction transverse to a longitudinal axis of said cannula to an expanded position and being movable to a contracted position against said bias in response to tissue resistance during penetration of the anatomical cavity wail, said expandable portion further being movable from said contracted position to said expanded position in response to a reduction in tissue resistance upon introduction of said expandable portion in the anatomical cavity to anchor said cannula to protrude into the anatomical cavity a distance corresponding to said predetermined distance.
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Accused Products
Abstract
A penetrating instrument for penetrating a wall of an anatomical cavity to gain access to the anatomical cavity includes a fixed or retractable penetrating member having a distal end for penetrating the anatomical cavity wall, a portal sleeve fixed relative to the penetrating member or movable between an extended position protecting the distal end of the penetrating member and a retracted position exposing the distal end of the penetrating member, and an expandable portion carried by the portal sleeve and movable from an expanded position to a contracted position during penetration of the cavity wall and from the contracted position to the expanded position upon introduction of the expandable portion in the anatomical cavity to anchor the portal sleeve relative to the anatomical cavity wall.
225 Citations
19 Claims
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1. A penetrating instrument for penetrating an anatomical cavity wall to gain access to an anatomical cavity comprising
a cannula having a distal end for being disposed in the anatomical cavity and a proximal end for being disposed externally of the anatomical cavity; -
a penetrating member disposed in said cannula and having a distal end for penetrating the anatomical cavity wall; and an expandable portion disposed along said cannula a predetermined distance from said cannula distal end, said expandable portion being biased outwardly in a lateral direction transverse to a longitudinal axis of said cannula to an expanded position and being movable to a contracted position against said bias in response to tissue resistance during penetration of the anatomical cavity wail, said expandable portion further being movable from said contracted position to said expanded position in response to a reduction in tissue resistance upon introduction of said expandable portion in the anatomical cavity to anchor said cannula to protrude into the anatomical cavity a distance corresponding to said predetermined distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification