Circular stapling instrument
First Claim
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1. A circular stapler comprising:
- a handle assembly;
an elongate body extending from the handle assembly; and
,a cartridge assembly mounted on a distal end of the elongate body, the cartridge assembly including a pusher assembly, a knife assembly received within the pusher assembly, and a compression member disposed between the pusher assembly and the knife assembly and movable between a compressed condition and an expanded condition, wherein the knife assembly is selectively fixed relative to the pusher assembly by the compression member for independent movement of the pusher assembly relative to the knife assembly, the knife assembly being initially detached from the pusher assembly during a first stroke of the handle assembly when the compression member is in the compressed condition, and subsequently attached to the pusher assembly during a second stroke of the handle assembly when the compression member is in the expanded condition, wherein the knife pusher is configured to maintain the compression member in the expanded condition during the second stroke.
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Abstract
A circular stapling instrument including a stapling forming assembly that is actuated independently from actuation of the cutting assembly is provided. The instrument includes a handle assembly, an elongate body extending from the handle assembly, a cartridge assembly mounted on a distal end of the elongate body. The cartridge assembly includes a pusher assembly and a knife assembly. The knife assembly is selectively fixed relative to the pusher assembly.
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Citations
19 Claims
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1. A circular stapler comprising:
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a handle assembly; an elongate body extending from the handle assembly; and
,a cartridge assembly mounted on a distal end of the elongate body, the cartridge assembly including a pusher assembly, a knife assembly received within the pusher assembly, and a compression member disposed between the pusher assembly and the knife assembly and movable between a compressed condition and an expanded condition, wherein the knife assembly is selectively fixed relative to the pusher assembly by the compression member for independent movement of the pusher assembly relative to the knife assembly, the knife assembly being initially detached from the pusher assembly during a first stroke of the handle assembly when the compression member is in the compressed condition, and subsequently attached to the pusher assembly during a second stroke of the handle assembly when the compression member is in the expanded condition, wherein the knife pusher is configured to maintain the compression member in the expanded condition during the second stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cartridge assembly for a circular stapler, the cartridge assembly comprising:
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a shell; a pusher assembly movably disposed within the shell; a knife assembly received within the pusher assembly; and a compression member supported between the pusher assembly and the knife assembly, the compression member being movable between a compressed condition in which the pusher the pusher assembly and the knife assembly are independently movable to an expanded condition in which the pusher assembly and the knife assembly are connected by the compression member and movable in unison, wherein the knife assembly is configured to prevent the compression member from moving from the expanded condition back to the compressed condition. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification