Rotary knife cutting systems
First Claim
Patent Images
1. A rotary cutting system for use with a surgical stapling device comprising:
- a knife blade having a distal cutting edge and a proximal base;
a support base positioned within a surgical stapling device;
a mainspring for imparting a motion to the knife blade relative to the support base; and
a releasable latch mechanism engagable with the knife blade to releasably restrain the knife blade against the bias of the mainspring, wherein a first end of the mainspring is attached to the support base and a second end of the mainspring is engageable with the knife blade, and the mainspring is a length of material spiral coiled upon itself and expandable from a wound condition storing energy to an expanded condition releasing energy such that the mainspring imparts rotary motion to the knife blade relative to the support base as the mainspring moves from the wound condition to the expanded condition.
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Abstract
There are disclosed rotary cutting systems for use with circular surgical stapling devices. The rotary cutting systems generally include a circular knife blade and a mainspring for imparting rotary motion to the circular knife blade. A latch mechanism is provided to maintain the knife blade on a linear travel path during a first predetermined distance and to release the circular knife blade for rotation due to the bias of the mainspring along a second predetermine distance. The circular knife blade may be rotated by the mainspring itself or, in an alternative embodiment, may be driven by frictional engagement with a rotational hammer.
1425 Citations
10 Claims
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1. A rotary cutting system for use with a surgical stapling device comprising:
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a knife blade having a distal cutting edge and a proximal base; a support base positioned within a surgical stapling device; a mainspring for imparting a motion to the knife blade relative to the support base; and a releasable latch mechanism engagable with the knife blade to releasably restrain the knife blade against the bias of the mainspring, wherein a first end of the mainspring is attached to the support base and a second end of the mainspring is engageable with the knife blade, and the mainspring is a length of material spiral coiled upon itself and expandable from a wound condition storing energy to an expanded condition releasing energy such that the mainspring imparts rotary motion to the knife blade relative to the support base as the mainspring moves from the wound condition to the expanded condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A rotary cutting system for use with a surgical stapling device comprising:
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a knife blade having a distal cutting edge and a proximal base; a support base positioned within a surgical stapling device; a mainspring for imparting motion to the knife blade relative to the support base; and a releasable latch mechanism engagable with the knife blade to releasably restrain the knife blade against the bias of the mainspring, wherein a first end of the mainspring is attached to the support base and a second end of the mainspring is engageable with the knife blade, the first end of the mainspring located radially inward of the second end of the mainspring. - View Dependent Claims (10)
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Specification