| abstract |
An endoscopic tool (100) for facilitating injection of fluid (121) into a submucosal layer of tissue includes a first cannula (124), a suction source (128), a fluid lumen (132), and a second cannula (136). The first cannula (124) has a suction surface (144) disposed at a distal end (146), and defines a suction lumen (148). The suction source (128) is coupled to the first cannula (124) and creates a negative pressure within the suction lumen (148). The second cannula (136) is disposed in a fluid lumen (132) separate from the suction lumen (148), is adapted to be coupled to a source of fluid (138), and carries a needle (140) at a distal end (139) thereof. The tool (100) draws the mucosal layer via the suction, which enlarges the submucosal layer, and injects a fluid into the enlarged portion of the submucosal layer via the needle (140), thereby creating a raised portion of tissue around the injection site. |