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ENDOSCOPE HOOD AND ENDOSCOPIC
MUCOSA CUTTING DEVICE
The present application is based on patent application No. 2003-290284 filed Aug. 8, 2003 in Japan, the content of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an endoscope hood and a endoscopic mucosa cutting device which are used to be inserted in a live organization together with a high frequency snare for a medical operation such as a demucosation for a live organization by conducting a high frequency electric current.
2. Description of Related Art
In recent years, endoscopic demucosations are performed for cutting a mucosa in a ailing section without performing an abdominal operation but using an endoscope instead. An endoscopic demucosation which used a high frequency snare is know for such a methods.
For such an endoscopic demucosation, an endoscope hood is proposed which is used in an auxiliary manner so as to be attached to a tip of an inserting section of the endoscope (See Japanese Unexamined Utility Application, First Publication No. Hei 6-75402, pages 4 to 5, FIG. 1, and Japanese Unexamined Patent Application, First Publications No. 2001-275933, pages 2 to 4, and FIG. 1). In such a case, a nail section which protrudes toward an inside of an tip margin of an approximate cylindrical cap section which is formed by a transparent member in a flange manner is provided so as to be used while being attached to the tip of the inserting section of the endoscope. The mucosa is cut by disposing the snare wire of the high frequency snare which is conducted via a channel in the endoscope over an inner section of the nail section, by absorbing the mucosa in the cap, and grabbing the mucosa by a loop wire of the high frequency snare, and conducting an electricity to the high frequency snare.
Also, an endoscope hood is proposed which can be used compatibly with an ultra-sonic probe which is inserted in the channel of the endoscope by connecting the tip of the soft tube to a connecting port which is disposed in the cap section and inserting the sheath of the high frequency snare via the soft tube (See pages 2 to 5, and FIG. 1 in a Japanese Unexamined Patent Application, First Publication No. 200245369).
SUMMARY OF THE INVENTION
An object of the present invention is to provide an endoscope hood and an endoscopic mucosa cutting device having therefore such that the loop of the snare wire is disposed in the inner portion of the nail section of the cap section reliably for performing the endoscopic demucosation.
Following structures are employed for solving the above problems. That is, an endoscope hood of the present invention comprises an approximate cylindrical cap section which has a flange section which protrudes toward an inside of an inner surface of a tip margin, an attaching section which is disposed to a base terminal of the cap section to be attached to a tip of an inserting section of the endoscope, a soft tube which is disposed outside of the inserting section of the endoscope when the cap section is attached to the endoscope for inserting snare sheath of high frequency snare such that
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an aperture of the tip is connected to the inside of the cap section, a high frequency snare which is inserted in the cap section via the soft tube, a snare wire feeding section in which a notch is formed in a part of the snare wire feeding
5 section in a corresponding position to the aperture of the tip of the soft tube in the flange section such that the snare wire of the high frequency snare can be disposed inside of the flange section by spreading the snare wire of the high frequency snare in the cap section, and a center axis of the
10 soft tube is disposed in a position which passes through a scope of the snare wire feeding section.
Also, an endoscope hood of the present invention comprises an approximate cylindrical cap section which has a
15 flange section which protrudes toward an inside of an inner surface of a tip margin, an attaching section which is disposed to a base terminal of the cap section to be attached to a tip of an inserting section of the endoscope, a soft tube for inserting snare sheath of high frequency snare into the
20 soft tube which is disposed outside of the inserting section of the endoscope when the cap section is attached to the endoscope for inserting snare sheath of high frequency snare such that an aperture of the tip is connected to the inside of the cap section, a high frequency snare which is inserted in
25 the cap section via the soft tube, a snare wire feeding section in which a notch is formed in a part of the snare wire feeding section in a corresponding position to the aperture of the tip of the soft tube in the flange section such that the snare wire of the high frequency snare can be disposed inside of the
3q flange section by spreading the snare wire of the high frequency snare in the cap section, and, a center axis of the snare sheath which is inserted in the aperture of the tip of the soft tube is disposed in a position which passes through a scope of the snare wire feeding section.
35 According to this invention, the snare sheath is inserted into the soft tube such that the center axis of the snare sheath passes through the snare feeding section when the snare wire is disposed in an inner portion of the flange section by feeding the snare wire from the snare sheath. Therefore, it is
40 possible to dispose a portion of the snare wire near the snare sheath in an inner section of the flange section reliably; thus, it is possible to restrict that the snare wire is removed from the flange section even if the cap section receives a force externally.
45 Also, the endoscopic mucosa cutting device according to the present invention comprises the endoscope hood and the high frequency snare.
BRIEF DESCRIPTION OF THE DRAWINGS
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FIGS. 1A and IB show an endoscopic mucosa cutting device according to a first embodiment of the present invention. FIG. 1A is a view for a general structure. FIG. IB is a plan view for showing a fixing section.
FIGS. 2A and 2B are views for showing an endoscope hood according to the first embodiment of the present invention. FIG. 2A is an isometric view. FIG. 2B is a view for showing important sections shown in FIG. 2A.
60 FIGS. 3A and 3B are views for showing an endoscope hood according to the first embodiment of the present invention. FIG. 3A is a cross section viewed in an axial direction. FIG. 3B is a view for showing important sections shown in FIG. 3A.
65 FIG. 4 is a plan view for showing a tip of a cap section in an endoscope hood according to the first embodiment of the present invention.
