Surgery – Instruments
Reexamination Certificate
1998-08-20
2001-02-13
Buiz, Michael (Department: 3731)
Surgery
Instruments
C606S198000, C604S105000
Reexamination Certificate
active
06187000
ABSTRACT:
TECHNICAL FIELD
The present invention is directed to a cannula for receiving surgical instruments for performing a surgical procedure on a body.
BACKGROUND OF THE INVENTION
Endoscopic surgical techniques allow a surgical procedure to be performed on a patient's body through a relatively small incision in the body and with a limited amount of body tissue disruption. Endoscopic surgery typically utilizes a tubular structure known as a cannula which is inserted into a small incision in the body. The cannula holds the incision open and serves as a conduit extending between the exterior of the body and the local area inside the body where the surgery is to be performed.
Due to the relatively small size of the passage into the body which is defined by the cannula, certain surgical procedures, such as posterior disectomies and procedures using steerable surgical instruments, have been difficult to perform using endoscopic techniques.
SUMMARY OF THE INVENTION
The present invention is a cannula for receiving surgical instruments for performing a surgical procedure on a body. The cannula comprises a tube structure defining a passage through which the surgical instruments are inserted into the body. The tube structure has a proximal end and a distal end. The tube structure includes an expandable portion for enabling an increase in the cross-sectional area of the passage at least at the distal end.
The expandable portion of the tube structure, when expanded, has a conical configuration. The expandable portion of the tube structure includes an arcuate slot and a guide pin disposed in the arcuate slot. The guide pin is movable from a terminal end of the slot to a second terminal end of the slot to enable the cross-sectional area of the passage at the distal end to increase.
The tube structure includes first and second tubular portions attached to one another. The second tubular portion comprises the expandable portion. The first tubular portion comprises a length of stainless steel tubing and the second tubular portion comprises an arcuate segment of stainless steel sheet stock rolled into a tubular shape.
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patent: 5163949 (1992-11-01), Bonutti
patent: 5197971 (1993-03-01), Bonutti
patent: 5354302 (1994-10-01), Ko
patent: 5707359 (1998-01-01), Bufalini
patent: 5902231 (1999-05-01), Foley et al.
patent: 807415 (1997-11-01), None
Med—MicroEndoscopic Discectomy System, brochure by Sofamore Danek.
Davison Thomas W.
Sher Adam
Taylor Timothy E.
Buiz Michael
Endius Incorporated
Lewis William
Tarolli, Sundheim, Covell Tummino & Szabo L.L.P.
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