Surgery – Diagnostic testing – Sampling nonliquid body material
Reexamination Certificate
1999-11-17
2001-09-04
Winakur, Eric F. (Department: 3736)
Surgery
Diagnostic testing
Sampling nonliquid body material
Reexamination Certificate
active
06283924
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to endoscopic biopsy forceps that is passed into a forceps channel in an endoscope to collect a tissue specimen to be analyzed by biopsy.
Endoscopic biopsy forceps generally comprise a sheath that is inserted into or removed out of a forceps channel in an endoscope, a manipulating wire provided to extend through the sheath and a pair of forceps cups that are provided at the distal end of the sheath and which are driven to open or close like beaks by advancing or retracting the manipulating wire in the axial direction. The forceps cups are formed in substantially symmetrical shapes and their opposed open ends have sharp blade-like edges.
To collect a tissue to be analyzed by biopsy, the operator pulls the manipulating wire toward himself so that the forceps cups are closed, whereupon tissue severing edges at the open ends of the forceps cups sever the tissue and the desired tissue specimen is collected in the forceps cups.
When the tissue pinched between the forceps cups is being severed, the forceps cups receive an irregular strong force, and a lateral displacement or a tilt, although small in amount, will occur in the forceps cups as they move like beaks.
As a result, even when the two forceps cups are completely closed, heir tissue severing edges do not meet perfectly but often fail to sever the tissue neatly to the last bit.
To deal with this case, the operator frequently tears off the tissue by pulling the biopsy forceps toward himself as it is pinched between the forceps cups but then the mucosa of the patient is damaged to cause undue bleeding.
SUMMARY OF THE INVENTION
An object, therefore, of the present invention is to provide endoscopic biopsy forceps with which the tissue to be analyzed by biopsy can be severed positively to the last bit so that a specimen of the tissue can be collected with minimum occurrence of bleeding.
To achieve the above-noted object, the present invention provides a novel arrangement for endoscopic biopsy forceps, in which forceps cups has opposed open ends slightly different in size, so that when said forceps cups are closed, the open end of one forceps cup rests into the open end of the other forceps cup.
The present invention further provides a novel arrangement for endoscopic biopsy forceps, in which forceps cups has opposed open ends and tissue severing edges which are formed on the open ends and slightly different in size, so that when said forceps cups are closed, the tissue severing edge of one forceps cup rests into the tissue severing edge of the other forceps cup.
In accordance with the present invention, when a tissue pinched between two forceps cups is being severed, the cups engage each other such that a tissue severing edge of the smaller cup is guided to rest inward of the tissue severing edge of the larger cup. As a result, the tissue can be severed positively to the last bit so that the desired specimen of the tissue is collected with minimum occurrence of bleeding.
The present disclosure relates to the subject matter contained in Japanese patent application Nos. Hei. 10-330360 (filed on Nov. 20, 1998) and Hei. 11-293474 (filed on Oct. 15, 1999), which are expressly incorporated herein by reference in their entireties.
REFERENCES:
patent: 5383471 (1995-01-01), Funnell
patent: 5386817 (1995-02-01), Jones
patent: 1-54059 (1989-11-01), None
patent: 3-26608 (1991-04-01), None
patent: 5-39684 (1993-10-01), None
patent: 6-16789 (1994-03-01), None
Asahi Kogaku Kogyo Kabushiki Kaisha
Greenblum & Berstein P.L.C.
Szmal Brian
Winakur Eric F.
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