Patent ID: 9402683
Filing Date: 2016-08-02
CPC Classification: A61B

Claim Text:
1. A submucosal layer dissection method using a submucosal layer dissection instrument comprising: an instrument body having an insertion path which is provided along an axial direction of the instrument body and which has a distal end opening positioned at a distal end portion of the instrument body; an incision instrument disposed inside the insertion path so as to be capable of protruding from and retracting from the distal end opening of the instrument body; and an expanding section which is provided on an outer surface of the distal end portion of the instrument body that is capable of expanding in a case of having received a supply of a fluid, a distal end part of the expanding section being positioned at the distal end portion of the instrument body when the expanding section is expanded; the method comprising: elevating an affected area of the digestive tract by supplying liquid into the submucosal layer; subsequent to the elevating, inserting the distal end portion of the instrument body which includes the expanding section into the submucosal layer; and subsequent to the inserting, expanding the expanding section until the distal end part of the expanding section is positioned at a same position of the distal end portion of the instrument body in the axial direction by supplying the fluid thereto until the submucosal layer is dissected by an expansion force of the expanding section while the incision instrument is inserted into the insertion path.