Surgical stapler with lockout mechanism
First Claim
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1. A surgical apparatus comprising:
- a) a cartridge supporting portion having a cartridge disposed therein which contains a plurality of surgical fasteners and a plurality of pushers configured to eject the surgical fasteners from the cartridge;
b) an anvil supporting portion having an anvil surface against which the surgical fasteners are driven when they are ejected from the cartridge;
c) a cam bar retainer operatively associated with the cartridge and retaining at least two cam bars configured to sequentially interact with the pushers as the cam bar retainer translates in a distal direction from a pre-fired proximal position;
d) a retaining member disposed within the cartridge supporting portion and configured in a first position to engage a cavity defined in a proximal end of the cam bar retainer when the cam bar retainer is in the pre-fired proximal position, the retaining member movable to a second position out of engagement with the cavity when the cam bar retainer is advanced from the pre-fired proximal position; and
e) a locking member supported on the cam bar retainer and configured to engage an aperture provided within the cartridge supporting portion upon retracting the cam bar retainer to a post-fired proximal position.
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Accused Products
Abstract
An apparatus for applying surgical fasteners is disclosed which includes a first lockout assembly configured to prevent premature ejection of fasteners during shipment and handling and a second lockout mechanism preventing reactuation of the apparatus after it has once been actuated. The second lockout mechanism includes a hook portion which engages a slot in the floor of the carrier channel.
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Citations
21 Claims
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1. A surgical apparatus comprising:
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a) a cartridge supporting portion having a cartridge disposed therein which contains a plurality of surgical fasteners and a plurality of pushers configured to eject the surgical fasteners from the cartridge; b) an anvil supporting portion having an anvil surface against which the surgical fasteners are driven when they are ejected from the cartridge; c) a cam bar retainer operatively associated with the cartridge and retaining at least two cam bars configured to sequentially interact with the pushers as the cam bar retainer translates in a distal direction from a pre-fired proximal position; d) a retaining member disposed within the cartridge supporting portion and configured in a first position to engage a cavity defined in a proximal end of the cam bar retainer when the cam bar retainer is in the pre-fired proximal position, the retaining member movable to a second position out of engagement with the cavity when the cam bar retainer is advanced from the pre-fired proximal position; and e) a locking member supported on the cam bar retainer and configured to engage an aperture provided within the cartridge supporting portion upon retracting the cam bar retainer to a post-fired proximal position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A disposable loading unit for a surgical apparatus comprising:
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a) an elongated carder channel; b) a cartridge disposed in a distal portion of the carrier channel and containing a plurality of surgical fasteners and a plurality of pushers configured to eject the surgical fasteners from the cartridge; c) a cam bar retainer disposed within the carrier channel and configured to translate therein in a longitudinal direction, the cam bar retainer movable distally from an initial pre-fired proximal position and subsequently retracted to a post-fired proximal most position; d) at least two elongated cam bars retained by the cam bar retainer and configured to sequentially interact with the pushers as the cam bar retainer translates in a distal direction; e) a first member provided at a proximal end of the carrier channel and in contact with the cam bar retainer to maintain the cam bar retainer in the pre-fired position and prevent proximal movement thereof, and f) a second member operatively associated with the cam bar retainer and configured to maintain the cam bar retainer in a post-fired position. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A disposable loading unit for a surgical apparatus comprising:
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a) an elongated carrier channel; b) a cartridge disposed in a distal portion of the carrier channel and containing a plurality of surgical fasteners and a plurality of pushers configured to eject the surgical fasteners from the cartridge; c) a cam bar retainer disposed within the carrier channel and configured to translate therein in a longitudinal direction, the cam bar retainer movable distally from an initial pre-fired proximal position and subsequently retracted to a post-fired proximal most position; d) at least two elongated cam bars retained by the cam bar retainer and configured to sequentially interact with the pushers as the cam bar retainer translates in a distal direction; e) a first member provided at a proximal end of the carrier channel and in contact with the cam bar retainer to maintain the cam bar retainer in the pre-fired position, and f) a second member operatively associated with the cam bar retainer and configured to maintain the cam bar retainer in a post-fired position wherein the pre-fired position is distal of the post-fired position.
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17. In a surgical apparatus including a cartridge containing a plurality of surgical fasteners and a plurality of pushers configured to eject the fasteners from the cartridge, an anvil defining a surface against which the surgical fasteners are driven when they are ejected from the cartridge, and a cam bar retainer retaining at least two cam bars configured to sequentially interact with the pushers as the cam bar retainer translates in a distal direction, the improvement comprising:
a lockout assembly including a hook member supported on the cam bar retainer and movable longitudinally therewith, the hook member configured to engage an aperture provided in the surgical apparatus when the cam bar retainer is retracted to a post-fired proximal position so as to prevent distal movement of the cam bar retainer. - View Dependent Claims (18, 19, 20, 21)
Specification