Laproscopic stapler

1. A surgical stapler comprising:

an end effector having:

a staple cartridge holder; and

an anvil movable relative to the staple cartridge holder between an open condition and a closed condition; and

an actuator coupled to the end effector to actuate the end effector from the open condition to the closed condition and drive stapling,

wherein:

the actuator comprises:

a handgrip body;

a first lever pivotable relative to the handgrip body from an expanded condition to a contracted condition and coupled to the end effector so that rotation of the first lever from its expanded condition to its contracted condition drives the end effector from its open condition to its closed condition; and

a second lever pivotable relative to the handgrip body between an expanded condition and a contracted condition and coupled to the end effector so that rotation of the second lever from its expanded condition to its contracted condition drives the stapling, wherein the first lever is behind the hand grip body and the second lever is in front of the hand grip body.

2. The stapler of claim 1 wherein:

the end effector has both stapling and cutting capability, and wherein

the second lever is coupled to the end effector so that rotation of the second lever from its expanded condition to its contracted condition drives a cutting.

3. The stapler of claim 1 wherein:

the first lever is pivotably mounted for rotation about a first axis and the second lever is pivotably mounted for rotation about a second axis parallel to the first axis.

4. The stapler of claim 1 wherein the actuator comprises:

a spring-loaded latch coupled to the first lever so that, upon the first lever reaching its contracted condition the latch prevents return of the first lever to its expanded condition; and

a latch release for disengaging the latch to permit return of the first lever to its expanded condition.

5. A surgical stapler comprising:

an end effector having:

a staple cartridge holder; and

an anvil movable relative to the staple cartridge holder between an open condition and a closed condition; and

an actuator coupled to the end effector to actuate the end effector from the open condition to the closed condition and drive stapling,

wherein:

the actuator comprises:

a handgrip body;

a first lever pivotable relative to the handgrip body from an expanded condition to a contracted condition and coupled to the end effector so that rotation of the first lever from its expanded condition to its contracted condition drives the end effector from its open condition to its closed condition; and

a second lever pivotable relative to the handgrip body between an expanded condition and a contracted condition and coupled to the end effector so that rotation of the second lever from its expanded condition to its contracted condition drives the stapling, wherein

the first lever is coupled to the end effector via a first flexible tension member and directly engages the first flexible tension member; and

the second lever is coupled to the end effector by a second flexible tension member and is coupled to the second flexible tension member by a ratio enhancement mechanism.

6. The stapler of claim 5 wherein:

the first flexible tension member comprises, at least along a portion engaging the end effector, a pair of flexible tension members laterally spaced from each other to prevent yawing torque.

7. A surgical stapler comprising:

an end effector having:

a staple cartridge holder; and

an anvil movable relative to the staple cartridge holder between an open condition and a closed condition; and

an actuator coupled to the end effector to actuate the end effector from the open condition to the closed condition and drive stapling,

wherein:

the actuator comprises:

a handgrip body;

a first lever pivotable relative to the handgrip body from an expanded condition to a contracted condition and coupled to the end effector so that rotation of the first lever from its expanded condition to its contracted condition drives the end effector from its open condition to its closed condition; and

a second lever pivotable relative to the handgrip body between an expanded condition and a contracted condition and coupled to the end effector so that rotation of the second lever from its expanded condition to its contracted condition drives the stapling, wherein

the first and second levers are respectively coupled to the end effector by first and second flexible tension members; and

the actuator is structurally coupled to the end effector via a conduit through which the first and second flexible tension members pass, the conduit positioned to undergo a counter-compression when tension is applied by the first and second triggers to the first and second flexible tension members.

8. A surgical stapler comprising:

an end effector having:

a staple cartridge holder; and

an anvil movable relative to the staple cartridge holder between an open condition and a closed condition; and

an actuator coupled to the end effector to actuate the end effector from the open condition to the closed condition and drive stapling,

wherein:

the actuator comprises:

a handgrip body;

a first lever pivotable relative to the handgrip body from an expanded condition to a contracted condition and coupled to the end effector so that rotation of the first lever from its expanded condition to its contracted condition drives the end effector from its open condition to its closed condition; and

a second lever pivotable relative to the handgrip body between an expanded condition and a contracted condition and coupled to the end effector so that rotation of the second lever from its expanded condition to its contracted condition drives the stapling, wherein, further comprising a blade cartridge in the cartridge holder, the blade cartridge comprising:

a cartridge body;

a plurality of staples, respectively accommodated in associated staple compartments of the cartridge body in an initial condition;

a plurality of staple pushers mounted in the body and positioned to be driven from an initial position to a second position, wherein movement from the initial position to the second position causes each staple pusher to drive one or more associated staples from their respective initial conditions outward toward fired conditions;

a sled positioned for a sliding movement along the body from an initial position to a second position and comprising:

a sled puller member having an end portion positioned so that pulling on the end portion tends to draw the sled from its initial position toward its second position; and

a plurality of ramps positioned to sequentially essentially engage associated said staple pushers as the sled is drawn from its initial position toward its second position, the engagement of the ramps to the associated staple pushers depressing the associated staple pushers from their respective initial positions to their respective second positions and, thereby, progressively ejects associated said staples; and

a knife assembly comprising;

a blade puller member having a first end portion through which the sled puller passes and a second end portion; and

a blade mounted to the second end portion of the blade puller member and having a cutting edge.

9. The stapler of claim 8 wherein:

the blade is pivotally mounted to the blade puller; and

the knife assembly has an initial position wherein the blade is accommodated in a blade compartment of the cartridge body and wherein a pulling of the slid puller member via the first end portion causes engagement between the blade and the surface of the blade compartment to rotate the blade to project the cutting edge from the cartridge body.

10. The stapler of claim 9 wherein:

the blade puller first end portion freely accommodates a dwell portion of the sled puller, whereby a pulling of the ramp puller from its first condition toward its second condition has:

an initial dwell phase wherein the dwell portion moves through the blade puller first portion without moving the blade; and

a second phase wherein the dwell portion has passed through the first portion and a stop surface of the ramp puller engages the blade puller to, in turn, pull the blade assembly along with the ramp assembly.

11. The stapler of claim 8 wherein:

the cartridge body carries a first plurality of said staples on a first side of the knife assembly and a second plurality of said staples along a second side of the knife assembly, the first and second pluralities of staples each comprising a plurality of rows of said staples.

12. An end effector having:

a staple cartridge holder; and

an anvil movable relative to the staple cartridge holder between an open condition and a closed condition; and

an actuator coupled to the end effector to actuate the end effector from the open condition to the closed condition and drive stapling,

wherein:

the actuator comprises:

a handgrip body;

a first lever pivotable relative to the handgrip body from an expanded condition to a contracted condition and coupled to the end effector so that rotation of the first lever from its expanded condition to its contracted condition drives the end effector from its open condition to its closed condition; and

a second lever pivotable relative to the handgrip body between an expanded condition and a contracted condition and coupled to the end effector so that rotation of the second lever from its expanded condition to its contracted condition drives the stapling, wherein further comprising a blade cartridge in the cartridge holder, the blade cartridge comprising:

a cartridge body;

a plurality of staples, respectively accommodated in associated staple compartments of the cartridge body in an initial condition;

a plurality of staple pushers mounted in the body and positioned to be driven from an initial position to a second position, wherein movement from the initial position to the second position causes each staple pusher to drive one or more associated staples from their respective initial conditions outward toward fired conditions;

a sled positioned for a sliding movement along the body from an initial position to a second position to sequentially essentially engage associated said staple, the engagement of the ramps to the associated staple pushers depressing the associated staple pushers from their respective initial positions to their respective second positions and, thereby, progressively ejects associated said staples; and

a knife assembly coupled to the sled so as to be pulled along with the sled after a dwell interval of motion of the sled.

13. The stapler of claim 12 wherein:

the dwell interval is at least 1 mm.

14. The stapler of claim 12 wherein:

a blade of the knife assembly is positioned to rotate into a deployed condition after said dwell.