Safety trocar penetrating instrument with conical and/or threaded trocar and safety shield

Claim 2

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 conical 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 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 to a position where said distal end of said safety shield is in substantial alignment with said trocar distal end when said safety shield is in said retracted position whereby said trocar distal end and said safety shield distal end present a substantially continuous surface during tissue penetration; wherein said angled distal end of said trocar defines an outer surface disposed at an acute conical with the trocar longitudinal axis and said safety shield distal end includes a conical external surface disposed in said retracted position at an acute angle with the trocar longitudinal axis that is substantially the same as said acute angle of said outer surface defined by said conical distal end of said trocar; wherein said stop means includes an internal surface on said safety shield distal end and an external surface on said trocar for matingly, cooperatively engaging said internal surface to limit proximal movement of said safety shield.

Claim 3

A safety trocar penetrating instrument as recited in claim 1 and further including a thread on said trocar distal end and a thread on said safety shield distal end for forming a continuation of said trocar distal end thread in said retracted position.

Claim 4

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 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 to a position where said distal end of said safety shield is in substantial alignment with said trocar distal end when said safety shield is in said retracted position whereby said trocar distal end and said safety shield distal end present a substantially continuous surface during tissue penetration; wherein said trocar distal end includes an outer surface which is disposed at an acute angle with the trocar longitudinal axis and said safety shield distal end includes an external surface disposed in said retracted position at an acute angle with the trocar longitudinal axis that is substantially the same as said acute angle of the outer surface of said trocar distal end; wherein said stop means includes an internal surface on said safety shield distal end and an external surface on said trocar for matingly, cooperatively engaging said internal surface to limit proximal movement of said safety shield; and further including a thread on said trocar distal end and a thread on said safety shield distal end for forming a continuation of said trocar distal end thread in said retracted position.

Claim 5

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 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 to a position where said distal end of said safety shield is in substantial alignment with said trocar distal end when said safety shield is in said retracted position whereby said trocar distal end and said safety shield distal end present a substantially continuous surface during tissue penetration; wherein said trocar distal end includes an outer surface which is disposed at an acute angle with the trocar longitudinal axis and said safety shield distal end includes an external surface disposed in said retracted position at an acute angle with the trocar longitudinal axis that is substantially the same as said acute angle of the outer surface of said trocar distal end; wherein said stop means includes an internal surface on said safety shield distal end and an external surface on said trocar for matingly, cooperatively engaging said internal surface to limit proximal movement of said safety shield; and further including a thread on said trocar distal end and a thread on said safety shield distal end for forming a continuation of said trocar distal end thread in said retracted position.