Surgical knife

Details Surgical knife Surgical knife

1999-04-06

2001-07-31

Dawson, Glenn K. (Department: 3761)

Surgery

Instruments

Cutting, puncturing or piercing

C606S019000

Reexamination Certificate

active

06267774

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a surgical knife or a scalpel especially intended for Caesarian sections or myometrium sections.
Generally, scalpels are required to have a sharp edge. However, in Caesarian section or myometrium section, an egg membrane covering a fetus may be mistakenly cut by a scalpel having too sharp an edge. Therefore, scalpels having too sharp an edge are not suitable for Caesarian section or myometrium section. Accordingly, it is necessary to dull an edge of scalpels to a certain extent for such operations.
SUMMARY OF THE INVENTION
An objective of the present invention is to provide a scalpel that can cut a muscle layer but is not likely to cut an egg membrane.
To achieve the above objective, the present invention provides a scalpel having a first outer edge, a second outer edge located opposite to the first outer edge and two sides defined within the first and second outer edges. The tip of the scalpel is formed along with a curved line that connects the first outer edge to the second outer edge. A plurality of projections and recesses are alternately formed along the first outer edge. And a sharp edge is formed on the projections or the recesses.
Other aspects and advantages of the present invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.


REFERENCES:
patent: 4037322 (1977-07-01), Bresler
patent: 4922614 (1990-05-01), Machida
patent: 4985034 (1991-01-01), Lipton
patent: 5085663 (1992-02-01), Tarr
patent: 5261922 (1993-11-01), Hood
patent: 5317938 (1994-06-01), De Juan et al.
patent: 5609603 (1997-03-01), Linden
patent: 52113588 (1977-09-01), None
patent: 54-75888 (1979-06-01), None
patent: 3-85010 (1991-08-01), None
patent: 8215202 (1996-08-01), None

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