Endoscopic ultrasound-guided cutting of holes and deep biopsy for diagnosis of gastric infiltrative tumors and gastrointestinal submucosal tumors using a novel vertical diathermic loop

Figure 1 Vertical electrode loop. A: The vertical electrode loop device; B: The loop is dragged into the sheath when not working; C and D: When working, the small loop that is vertically wielded to the end of the electric metal wire is pushed out of the sheath.