Trocar system

A trocar comprising:

• a trocar housing having an open distal end;
• a stylet located within said trocar housing, said stylet having a sharp tip at a distal end thereof, said stylet being slideably mounted for movement between an extended position and a retracted position, the sharp tip in the retracted position of the stylet being located within a second housing arranged coaxially with said trocar housing, said stylet being disposed longitudinally central within the trocar housing;
• a return spring n said trocar housing for biasing said stylet toward said retracted position;
• latching means in said trocar housing for locking said stylet in said extended position wherein the sharp tip extends beyond the distal end of the second housing;
• de-latching means located within said trocar housing for releasing the latching means to allow the return spring to retract the stylet into the second housing;
• and
• a set link slideably mounted in and projecting from said trocar housing operative for moving said stylet form the retracted to the extended position.

A trocar comprising:

• a trocar housing having an open distal end;
• a stylet located within said trocar housing, said stylet having a sharp tip at a distal end thereof, said stylet being slideably mounted for movement between an extended position and a retracted position, the sharp tip in the retracted position of the stylet being located within a second housing arranged coaxially with the trocar housing, said stylet being disposed longitudinally central within the trocar housing;
• a return spring in said trocar housing for biasing said stylet toward said retracted position;
• a set link slideably mounted in and projecting from said trocar housing operative for moving said stylet form the retracted to the extended position;
• a piston, said piston being slideably mounted within said trocar housing;
• a protruding element on said stylet operative for travel within a confining slot in said piston for allowing limited movement between the stylet and the piston;
• said piston being connected to said set link and said return spring such that operation of the set link to move the stylet from the retracted to the extended position moves said piston and thereby moves the stylet through said means connecting the stylet and piston, said piston compressing the return spring as the piston moves from the retracted to the extended position;
• latching means in said trocar housing for locking said stylet in said extended position wherein the sharp tip extends beyond the distal end of the trocar housing;
• and
• de-latching means located within said trocar housing for releasing the latching means to allow the return spring to retract the stylet into the housing.

A trocar comprising:

• a trocar housing having an open distal end;
• a stylet located within said trocar housing, said stylet having a sharp tip at a distal end thereof, said stylet being slideably mounted for movement between an extended position and a retracted position, the sharp tip in the retracted position of the stylet being located within a protecting housing, said stylet being disposed longitudinally central within the trocar housing;
• means for retracting the stylet into said trocar housing;
• a set link slideably mounted in and projecting from said trocar housing operative for moving said stylet from the retracted to the extended position;
• a piston, said piston being slideably mounted within said trocar housing;
• said piston being connected to said set link and said return spring such that operation of the set link to move the stylet from the retracted to the extended position moves said piston, said piston compressing the return spring as the piston moves from the retracted to the extended position;
• latching means in said trocar housing for locking said stylet in said extended position wherein the sharp tip extends beyond the distal end of the protecting housing;
• de-latching means located within said trocar housing for releasing the latching means to allow the return spring to retract the stylet into the housing;
• and
• a cooperating distally biased blunt sensor element, said distally biased sensor element retracting proximally and extending distally in a normal cycle of use of the trocar system, the cycle of use, first proximal and then distal, automatically activating said delatching means, and said means for retracting the stylet into said trocar housing being enabled when said delatching means is activated.

A trocar comprising:

• a trocar housing having an open distal end;
• a stylet located within said trocar housing, said stylet having a sharp tip at a distal end thereof, said stylet being slideably mounted for movement between an extended position and a retracted position, the sharp tip in the retracted position of the stylet being located within a second housing, said stylet being disposed longitudinally central within the trocar housing;
• a return spring in said trocar housing for biasing said stylet toward said retracted position;
• latching means in said trocar housing for locking said stylet in said extended position wherein the sharp tip extends beyond the distal end of the second housing;
• de-latching means located within said trocar housing for releasing the latching means to allow the return spring to retract the stylet into the second housing;
• a set link slideably mounted in and projecting from said trocar housing operative for moving said stylet from the retracted to the extended position;
• the delatching means comprising:
• a piston, said piston being slideably mounted within said trocar housing and having a delatching element thereon;
• means connecting said stylet and said piston for allowing limited movement between the stylet and the piston;
• said piston being connected to said set link and said return spring such that operation of the set link to move the stylet from the retracted to the extended position moves said piston and thereby moves the stylet through said means connecting the stylet and piston, said piston compressing the return spring as the piston moves from the retracted to the extended position.