Surgery – Instruments – Electrical application
Reexamination Certificate
1998-09-18
2001-02-27
Cohen, Lee (Department: 3739)
Surgery
Instruments
Electrical application
C606S046000, C606S047000, C604S021000, C604S114000
Reexamination Certificate
active
06193717
ABSTRACT:
BACKGROUND OF THE INVENTION
The present disclosure relates to subject matter contained in Japanese Patent Application No. 9-283212 (filed on Oct. 16, 1997) and Japanese Patent Application No. 9-283213 (filed on Oct. 16, 1997), which are expressly incorporated herein by reference in their entireties.
1. Field of the Invention
The present invention relates to a treating instrument used through an instrument-inserting channel of an endoscope.
2. Description of the Prior Art
There are various instruments used with endoscopes. Syringes are used, for example, to inject a liquid medicine into the mucous membrane in a body cavity. High-frequency snares are used, for example, to excise polyps from the mucous membrane surface. These instruments are arranged such that a treating member, i.e. a syringe needle or a snare wire, used to apply a treatment to the mucous membrane in the body cavity projects from and withdraws into the distal end of a sheath removably inserted into an instrument-inserting channel of an endoscope.
When such a syringe for an endoscope is used to give an injection into the mucous membrane in a body cavity, there may be bleeding from a hole opening after the needle has been pulled out. In the case of removal of a polyp with a high-frequency snare, there may also be bleeding from the cut end of the mucous membrane surface.
In such a case, if a large amount of blood is lost through the bleeding because the blood vessel as a bleeding source is thick, the bleeding itself is dangerous. Even when the amount of blood lost is not so large, as the time proceeds, the endoscopic observation may become impossible to perform due to the bleeding. In such a case, it is difficult to continue the endoscopic examination.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a treating instrument for an endoscope that is capable of preventing bleeding after an endoscopic treatment.
Other objects and advantages of the present invention will become apparent from the following detailed description of illustrated embodiments of the invention.
According to the present invention, there is provided a treating instrument for an endoscope that includes a flexible sheath removably inserted into an instrument-inserting channel of the endoscope. A flexible fluid transfer tube is axially movably inserted in the sheath. A syringe needle is provided at the distal end of the fluid transfer tube. The needle is made of an electrically conductive material. The needle is projected from and withdrawn into the distal end of the sheath by axially moving the fluid transfer tube from the proximal end thereof. An electrically conductive member extends through the sheath without electrically conducting to the surface of the sheath. The electrically conductive member is electrically connected at a distal end thereof to the needle and connected at a proximal end thereof to a high-frequency power supply at the proximal end of the sheath.
In addition, there is provided a treating instrument for an endoscope that includes a flexible sheath removably inserted into an instrument-inserting channel of the endoscope. The outer surface of the sheath is formed from an electrically insulating tube. The treating instrument further includes a treating member for applying a treatment to mucous membrane in a body cavity. The treating member is projected from and withdrawn into the distal end of the sheath by an operation conducted at the proximal end of the sheath. An exposed electrode is provided at the distal end surface of the sheath. An electrically conductive member extends through the sheath without electrically conducting to the surface of the sheath. The electrically conductive member is electrically connected at a distal end thereof to the electrode and connected at a proximal end thereof to a high-frequency power supply at the proximal end of the sheath.
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Asahi Kogaku Kogyo Kabushiki Kaisha
Cohen Lee
Greenblum & Bernstein P.L.C.
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