Surgery – Instruments – Electrical application
Reexamination Certificate
1997-05-01
2001-03-13
Shay, David M. (Department: 3739)
Surgery
Instruments
Electrical application
C606S039000, C606S046000
Reexamination Certificate
active
06200313
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Art
This invention relates generally to a medical puncture instrument, and more particularly to a puncture instrument for punctured high frequency treatments, having a high frequency electrode on a puncture needle member to be driven into a target organ or tissues in an intracorporeal region of a patient for a high frequency treatment.
2. Description of the Prior Art
For instance, ultrasound endoscopes are widely resorted to in the medical fields not only for intracorporeal examinations and diagnosis but also for therapeutic purposes to give an appropriate treatment to a diseased portion on the basis of the results of an examination or diagnostic observation. In many cases, the ultrasound endoscopes of this sort are provided with an ultrasound imaging means along with an endoscopic observation means at the fore end of a catheter-like insert portion to be introduced into an intracavitary portion of a patient. The endoscopic observation means is suitable for examinations of conditions of intracavitary walls, while the ultrasound observation means is suitable for examinations of tissues in deeper intracorporeal regions. In case a diseased portion is spotted by any of these examinations, there arises a necessity for inserting a therapeutic instrument for the treatment of the diseased portion. For this purpose, the ultrasound endoscopes are usually provided with the so-called biopsy channel which is designed to guide a bioptic or therapeutic instrument to be inserted into a particular intracorporeal portion under observation through the endoscopic or ultrasound imaging means. Some bioptic or therapeutic instruments are inserted into and manipulated through a biopsy channel on an endoscope for the treatment of a certain intracorporeal portion, as in the case of forceps and high frequency therapeutic instruments which are used for sampling intracavitary wall tissues or for coagulation or hemorrhage control treatments. On the other hand, it has been known in the art to penetrate a puncture instrument into an intracorporeal organ or tissues of interest through an intracavitary wall for injection of a medicinal liquid or for an aspiratory or suctional drainage treatment.
In this connection, conventional instruments designed for high frequency therapeutic treatments within an intracavitary tract, for example, are unable to treat cancer cells or other diseased portions which exist underneath the mucous membrane. On the other hand, conventional puncture needles are designed to serve for a treatment of a specific nature such as injection of a medicinal liquid or suctional evacuation of a diseased portion, and thus have only a limited range of application, precluding applications to other treatments like high frequency treatments.
SUMMARY OF THE INVENTION
Under these circumstances, it is a primary object of the present invention to provide a puncture instrument capable of performing a high frequency treatment such as a high frequency coagulation or high frequency incision treatment on a diseased portion in an intracorporeal region of a patient in a secure and reliable manner.
In accordance with the invention, the above-stated objective is achieved by the provision of a puncture instrument capable of punctured high frequency treatments, the puncture instrument essentially including: a guide tube to be inserted into an intracavitary portion of a patient; a puncture needle member having an elongated needle body slidably received in the guide tube, and a sharp-pointed needle head provided contiguously at the fore end of the elongated needle body and protrudable out of the guide tube to penetrate into a target intracorporeal portion to be treated; and a high frequency electrode provided on a fore end portion of the needle body for penetration into the intracorporeal portion together with the sharp-pointed needle head.
In order to introduce the puncture instrument into an intracorporeal portion which needs a high frequency treatment, for example, by using an ultrasound endoscope as a guide means, firstly the instrument is inserted into a biopsy channel of an endoscope with the puncture needle in a retracted position within the guide tube. As soon as the tip end of the endoscope reaches an intracavitary portion of interest, the puncture instrument is protruded from the biopsy channel to abut the fore end of the guide tube against an intracavitary wall portion to be penetrated by the puncture needle member. Then, the puncture needle member is driven into a target intracroporeal portion where the high frequency electrode is positioned in face to face relation with the diseased portion. In this state, high frequency current is applied to the electrode to give the diseased portion a high frequency treatment such as a high frequency coagulation treatment or a high frequency incision treatment which makes a cut by evaporation of tissues.
The above and other objects, features and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings which show by way of example a number of preferred embodiments of the invention.
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Abe Kenji
Kondo Mituo
Fuji Photo Optical Co., Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Shay David M.
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