Safety trocar penetrating instrument with safety shield having resilient legs
First Claim
1. A safety trocar penetrating instrument comprisingan elongate, tubular portal sleeve having a distal end and a proximal end;
- a housing coupled with said proximal end of said portal sleeve and having a valve therein for controlling fluid flow through said housing and said portal sleeve and for allowing passage of instruments therethrough;
a trocar disposed within said portal sleeve and having a longitudinal axis, a proximal end and a solid, distal end terminating at a sharp tip beyond said distal end of said portal sleeve for penetrating tissue;
a safety shield disposed between said portal sleeve and said trocar and having a proximal end and a distal end and being movable between an extended position with said safety shield distal end protruding distally of said trocar tip and a retracted position with said safety shield distal end disposed proximally of said trocar tip to expose said trocar tip;
a hub abutting said housing for receiving said proximal ends of said trocar and said safety shield, said trocar and said safety shield passing through said a valve in said housing;
bias means for biasing said safety shield toward said extended position and for permitting said safety shield to move proximally to said retracted position in response to a proximally directed force applied to said safety shield distal end, said bias means returning said safety shield to said extended position when the force applied to said safety shield distal end is removed; and
stop means for limiting proximal movement of said safety shieldwherein said trocar distal end includes a plurality of angled, flat sides joined at edges and said safety shield distal end includes a plurality of legs equal to said plurality of sides and having lateral edges aligned with said edges of said sides and wherein said legs taper distally along said sides to an apex disposed distally of said tip in said extended position, said legs being formed of a resilient, flexible material allowing said legs to expand outwardly from the trocar longitudinal axis in said retracted position.
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Accused Products
Abstract
A safety trocar penetrating instrument particularly useful in least invasive surgery includes a portal sleeve, a trocar disposed in the portal sleeve and having a sharp, solid, angled tissue penetrating distal end and a safety shield disposed in the portal sleeve and receiving the trocar, the safety shield being movable relative to the trocar between an extended position wherein a distal end of the safety shield protects the sharp tip and a retracted position exposing the sharp tip. The configuration of the distal ends of the trocar and the safety shield in the retracted position present a substantially continuous, angled surface for penetrating tissue. A hub receiving proximal ends of the trocar and safety shield includes a locking mechanism allowing the safety shield to be automatically or optionally locked in the extended position and permitting selective, releasable or automatic locking of the safety shield in the retracted position.
57 Citations
3 Claims
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1. A safety trocar penetrating instrument comprising
an elongate, tubular portal sleeve having a distal end and a proximal end; -
a housing coupled with said proximal end of said portal sleeve and having a valve therein for controlling fluid flow through said housing and said portal sleeve and for allowing passage of instruments therethrough; a trocar disposed within said portal sleeve and having a longitudinal axis, a proximal end and a solid, distal end terminating at a sharp tip beyond said distal end of said portal sleeve for penetrating tissue; a safety shield disposed between said portal sleeve and said trocar and having a proximal end and a distal end and being movable between an extended position with said safety shield distal end protruding distally of said trocar tip and a retracted position with said safety shield distal end disposed proximally of said trocar tip to expose said trocar tip; a hub abutting said housing for receiving said proximal ends of said trocar and said safety shield, said trocar and said safety shield passing through said a valve in said housing; bias means for biasing said safety shield toward said extended position and for permitting said safety shield to move proximally to said retracted position in response to a proximally directed force applied to said safety shield distal end, said bias means returning said safety shield to said extended position when the force applied to said safety shield distal end is removed; and stop means for limiting proximal movement of said safety shield wherein said trocar distal end includes a plurality of angled, flat sides joined at edges and said safety shield distal end includes a plurality of legs equal to said plurality of sides and having lateral edges aligned with said edges of said sides and wherein said legs taper distally along said sides to an apex disposed distally of said tip in said extended position, said legs being formed of a resilient, flexible material allowing said legs to expand outwardly from the trocar longitudinal axis in said retracted position. - View Dependent Claims (2, 3)
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Specification