Mucosa separation apparatus, and method for mucosa separation
This mucosa separation apparatus includes a first insertion portion inserted to the interior of a subject, an expansion portion disposed on a head portion of the first insertion portion, and which expands by infusion of a fluid, a passage formed within the first insertion portion and connected to the expansion portion, for supplying the fluid to the expansion portion, and a curving portion which makes a head portion of an instrument inserted to the interior of the subject curve with respect to a part of the instrument which is closer to a base portion of the instrument than the head portion thereof.
1. A mucosa separation apparatus configured for performing mucosa separation, comprising:
a first insertion portion inserted into an interior of a subject comprising a first channel, a second channel, and a third channel;
an expansion portion disposed on a head portion of the first insertion portion, and which expands by infusion of a fluid;
the first channel being configured to supply the fluid to the expansion portion;
a high-frequency incision tool inserted within the second channel such that the high-frequency incision tool is capable of advancing to and retracting from a position at a head side beyond the expansion portion;
an operation wire inserted within the first channel, the operation wire configured to curve the head portion of the first insertion portion that includes the expansion portion and the high-frequency incision tool with respect to a part of the first insertion portion which is closer to a base portion of the first insertion portion than the head portion thereof; and
a first curving support member comprising a plate member inserted within the third channel, the first curving support member configured to curve the head portion of the first insertion portion in a particular direction, wherein
the expansion portion is configured to be expanded in a state that the first curving support member is inserted into an incision portion such that a longitudinal axis of the first curving support member has a predetermined angle to a face of the incision portion,
a plurality of holes are formed in the first channel to communicate from the first channel to an inside of the expansion portion so as to supply a medium for expansion to the expansion portion,
the plurality of holes is provided in line on a plane including the particular direction in which the first insertion portion curves, the plurality of holes being positioned and configured so as to form a flexible portion, which is more flexible than the base portion of the first insertion portion in the particular direction,
the flexible portion is positioned within a range where the expansion portion of the first insertion portion is provided,
an external diameter of the high-frequency incision tool is smaller than an external diameter of the expansion portion in a deflated state,
the first curving support member is eccentrically inserted into an inside of the first insertion portion relative to an external diameter direction,
the high-frequency incision tool is inserted into the second channel at an opposite radial side of the first curving support member, and
the plurality of the holes which form the flexible portion is provided on an opposite radial side to which the first curving support member is eccentric.
2. The mucosa separation apparatus according to claim 1 , wherein
a head end of the operation wire is connected to the head portion of the first insertion portion within the first channel and a base end of the operation wire is connected with an operation section disposed on a base portion of the first insertion portion; and further wherein
the head portion of the first insertion portion is curved by moving the operation section.
3. The mucosa separation apparatus according to claim 2 , wherein
the first curving support member is arranged so as to bring said one direction into line with the direction in which the head portion of the first insertion portion is allowed to curve.