Surgical stapling apparatus with firing lockout mechanism
First Claim
1. A surgical stapling apparatus comprising:
- a body portion defining a longitudinal axis having a proximal end and a distal end;
a tool assembly supported on the distal end of the body portion, the tool assembly including an anvil assembly and a cartridge assembly, the tool assembly being movable from an unapproximated position to an approximated position,a drive member movable within the tool assembly from a pre-fired retracted position to an advanced position to move the tool assembly from the unapproximated position to the approximated position, the drive member also being movable from the advanced position to a post-fired retracted position, the drive member having a stop surface; and
a firing lockout assembly including a latch member having a blocking member and a biasing member, the latch member being pivotally supported within the tool assembly and movable from a first position to a second position, wherein in the first position the blocking member of the latch member is aligned with the stop surface of the drive member to prevent advancement of the drive member within the tool assembly and in the second position the blocking member is misaligned with the stop surface of the drive member to permit advancement of the drive member within the tool assembly, the biasing member being positioned to urge the latch member towards the first position;
wherein in the pre-fired retracted position of the drive member, the latch member is in the first position.
1 Assignment
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Accused Products
Abstract
A surgical stapling apparatus is provided which includes a first jaw supporting an anvil assembly and a second jaw supporting a cartridge assembly. The cartridge assembly supports a firing lockout assembly which includes a latch member having a blocking member. The latch member is movable between a first position and a second position. In the first position, the blocking member of the latch member is aligned with the stop surface of the drive member to prevent advancement of the drive member within the tool assembly and in the second position, the blocking member is misaligned with the stop surface of the drive member to permit advancement of the drive member within the tool assembly. A biasing member is positioned to urge the latch member towards the first position. In the retracted position of the drive member, the latch member is in the first position.
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Citations
13 Claims
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1. A surgical stapling apparatus comprising:
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a body portion defining a longitudinal axis having a proximal end and a distal end; a tool assembly supported on the distal end of the body portion, the tool assembly including an anvil assembly and a cartridge assembly, the tool assembly being movable from an unapproximated position to an approximated position, a drive member movable within the tool assembly from a pre-fired retracted position to an advanced position to move the tool assembly from the unapproximated position to the approximated position, the drive member also being movable from the advanced position to a post-fired retracted position, the drive member having a stop surface; and a firing lockout assembly including a latch member having a blocking member and a biasing member, the latch member being pivotally supported within the tool assembly and movable from a first position to a second position, wherein in the first position the blocking member of the latch member is aligned with the stop surface of the drive member to prevent advancement of the drive member within the tool assembly and in the second position the blocking member is misaligned with the stop surface of the drive member to permit advancement of the drive member within the tool assembly, the biasing member being positioned to urge the latch member towards the first position; wherein in the pre-fired retracted position of the drive member, the latch member is in the first position. - View Dependent Claims (2, 3)
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4. A surgical stapling apparatus comprising:
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a body portion defining a longitudinal axis having a proximal end and a distal end; a tool assembly supported on the distal end of the body portion, the tool assembly including an anvil assembly and a cartridge assembly, the tool assembly being movable from an unapproximated position to an approximated position, a drive member movably supported within the tool assembly from a retracted position to an advanced position to move the tool assembly from the unapproximated position to the approximated position, the drive member having a stop surface; and a firing lockout assembly including a latch member having a blocking member and a biasing member, the latch member being pivotally supported within the tool assembly and movable from a first position to a second position, wherein in the first position the blocking member of the latch member is aligned with the stop surface of the drive member to prevent advancement of the drive member within the tool assembly and in the second position the blocking member is misaligned with the stop surface of the drive member to permit advancement of the drive member within the tool assembly, the biasing member being positioned to urge the latch member towards the first position; wherein in the retracted position of the drive member, the latch member is in the first position, the cartridge assembly further including an actuation sled positioned within the tool assembly to be engaged by the drive member as the drive member is moved from the retracted position towards the advanced position, the drive member effecting movement of the actuation sled from a retracted position to an advanced position upon movement of the drive member from the retracted position to the advanced position, the actuation sled being configured to engage the latch member to move the latch member from the first position to the second position when the actuation sled is advanced distally within the cartridge assembly by the drive member; and wherein the latch member includes a u-shaped body including a base member which supports the blocking member and a pair of spaced legs extending distally from the base member, each of the spaced legs supporting a centrally located pivot member and having a distal projection. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification