High-frequency treatment tool

Details High-frequency treatment tool High-frequency treatment tool

1999-01-21

2001-08-14

Cohen, Lee (Department: 3739)

Surgery

Instruments

Electrical application

C606S051000

Reexamination Certificate

active

06273887

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency treatment tool which can be inserted into a body to grip tissue and coagulate/incise it.
Generally, as a high-frequency treatment tool capable of gripping vital tissue and coagulating/incising it, a bipolar forceps having jaws as a pair of gripping members for gripping vital tissue and high-frequency current supply electrodes formed on the jaws is known. In this bipolar forceps, when vital tissue to be treated is gripped between the pair of jaws, and a high-frequency current is provided across the electrodes of the jaws, the vital tissue between the jaws is coagulated or incised.
Bipolar forceps of this type are normally used for various purposes, e.g., to stop bleeding from blood vessels included in vital tissue, cauterize a morbid portion or bleeding point on the surface of vital tissue, or close a uterine tube for contraception, and disclosed in, e.g., Jpn. Pat. Appln. KOKAI Publication No. 8-317936, Ger. Publication DE 4138116 A1, Ger. Publication DE 4032471 C2, or EP 0598348 A1.
In the conventional bipolar forceps, especially, when thin membranous tissue is gripped by the jaws, the metal portions of the jaws may come into contact with each other to flow a high-frequency current across the metal portions in contact. That is, the jaws electrically short-circuit. In this case, the high-frequency current does not flow to the tissue gripped between the jaws, so the tissue cannot be reliably coagulated or incised. In addition, if complete coagulation cannot be performed, bleeding may occur during the subsequent incision.
In the bipolar forceps disclosed DE 4138116 A1 or DE 4032471 C2, tissue is gripped by three rod electrodes. For this reason, the tissue escapes upon gripping and cannot be reliably gripped. Hence, coagulation/incision cannot be satisfactorily performed.
In the bipolar forceps disclosed in DE 4032471 C2 (
FIG. 2
) or DE 4138116 A1 (FIGS.
5
and
6
), the far ends of the coagulation and incision electrodes are at the same position to incise the entire coagulation region. This may cause bleeding. In addition, a bipolar high-frequency incision tool disclosed in EP 059348 A1 incises the entire gripped region.
BRIEF SUMMARY OF THE INVENTION
It is the first object of the present invention to provide a high-frequency treatment tool capable of preventing an electrical short circuit between a pair of gripping members and reliably coagulating/incising tissue. It is the second object of the present invention to provide a high-frequency treatment tool capable of reliably gripping tissue to coagulate/incise it. It is the third object of the present invention to provide a high-frequency treatment tool capable of incising only coagulated tissue and preventing bleeding.
The objects of the present invention are achieved by the following high-frequency treatment tool. A high-frequency treatment tool according to the present invention comprises an insertion portion which can be inserted into a body; a pair of gripping portions arranged at a distal end portion of the insertion portion and having gripping surfaces for gripping vital tissue; a driving mechanism for opening/closing the gripping portions between closing positions where the gripping portions abut against each other and open positions where the gripping portions are separated from each other; electrode portions formed on the gripping surfaces of the gripping portions, to which a high-frequency current is flowed to coagulate/incise the vital tissue gripped by the gripping portions; and short circuit prevention means for preventing a short circuit between the electrode portions of the gripping portions when the gripping portions are placed at least at the closing positions.
Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.


REFERENCES:
patent: 4492231 (1985-01-01), Auth
patent: 5853412 (1998-12-01), Mayenberger
patent: 5891142 (1999-04-01), Eggers et al.
patent: 6024744 (2000-02-01), Kese et al.
patent: 6187003 (2001-02-01), Buysee et al.
patent: 40 32 471 C2 (1992-04-01), None
patent: 41 38 116 A1 (1993-06-01), None
patent: 0 598 348 A1 (1994-05-01), None
patent: 8-317936 (1996-12-01), None

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