Surgery – Instruments – Suture – ligature – elastic band or clip applier
Reexamination Certificate
2000-02-29
2001-08-14
Chaudhuri, Olik (Department: 2814)
Surgery
Instruments
Suture, ligature, elastic band or clip applier
C606S219000
Reexamination Certificate
active
06273897
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a surgical buttress that eliminates or minimizes loss or leakage of bodily fluids, including blood or air, and a surgical stapling apparatus that applies the buttress to body tissue.
BACKGROUND OF THE INVENTION
During surgical procedures it is necessary to approximate organ tissue with surgical staples. Surgeons often use linear cutter stapling devices to suture body organs and tissues such as lung, esophagus, stomach, duodenum and other body organs. Such devices apply a plurality of laterally spaced rows of staples on opposite sides of a tissue cut.
Examples of such surgical staplers are disclosed in U.S. Pat. Nos. 4,633,861 and 4,892,244, the disclosures of which are incorporated herein by reference. The surgical stapler includes a pair of cooperating elongated jaw members. One of the jaws members includes a staple cartridge with at least two laterally spaced rows of staples and the other jaw member includes an anvil with staple closing depressions in alignment with the rows of staples in the cartridge. A pusher block is directed longitudinally along the jaws to sequentially eject staples from the cartridges in a manner that closes the staples against the anvil to form laterally spaced lines of staples through tissues that is gripped between the jaws. A knife is associated with the pusher block so as to move forward along the jaws to cut the tissue along the line between the previously formed staple rows.
When operating on tissue it is desirable to close open blood vessels (hemostasis) along the cut line. And in procedures that involve approximating lung tissue it is necessary to seal the lung to avoid air leakage (pneumostasis). U.S. Pat. No. 5,263,629 discloses a method and apparatus for achieving hemostasis along a staple line by utilizing a pledget material positioned adjacent to at least one surface of the tissue. The line of staples is formed so as to extend through the tissue and the absorbable pledget material. The pledget material is selected so as to substantially uniformly distribute pressure along the staple line and thereby cause substantial hemostasis along the tissue cut. Preferred materials for these pledgets are sterile absorbable tightly woven fabrics. The pledgets may be secured to the stapler by spaced apart ultrasonic welds or spaced apart adhesive bonds.
U.S. Pat. No. 5,964,774, the contents of which is hereby incorporated by reference in its entirety, also discloses surgical stapling apparatus having tissue bolstering material disposed thereon for application of the material and staples to body tissue. Releasable attachment of the tissue bolstering material to the stapling device is accomplished via a plurality of pins or a combination of pins and clips.
It would be advantageous to provide a bolstering material that is releasably attachable to the staple cartridge and/or the anvil of a surgical stapling apparatus without conventional pins, clips, welds or adhesives.
SUMMARY OF THE INVENTION
The present invention provides a surgical buttress, i.e. pledget, for approximating body tissue, which buttress provides sealing for hemostasis and pneumostasis, and which buttress comprises a continuous projection, or a plurality of projections, wherein the projection(s) are of sufficient number, dimension and spatial relationship effective to provide a releasable pressure fit of the projection into means for receiving the projections located in the staple cartridge or the anvil of a surgical stapling apparatus when placed in cooperation therewith, thereby maintaining the buttress in covering relationship with the cartridge and/or anvil. The invention also provides a surgical stapling apparatus comprising the improved buttress.
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Dalessandro David A.
Vyakarnam Murty N.
Chaudhuri Olik
Ethicon Inc.
Trinh (Vikki) Hoa B.
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