Advances in traction methods for endoscopic submucosal dissection: What is the best traction method and traction direction?

Table 1 Classification of device-assisted traction method

	Traction direction	Control of traction force	Withdrawal of the endoscope	Recommended lesion location
External traction methods
Clip-with-line method	One	Strengthen	Required	Esophagus, Greater curvature of the upper and middle third of the stomach, Colorectum
Pulley method	Any	Strengthen	Required	unclear because of fewer reports
Sheath traction method
Clip-and-snare method	Two	Strengthen and weaken	Required	Stomach, Rectum
Endo Trac	Two	Strengthen and weaken	Required	Stomach, Rectum
External forceps method	Two	Strengthen and weaken	Required	Esophagus; Stomach except for cardia, lesser curvature or posterior wall of the upper gastric body; Rectum
Double scope method	Any	Strengthen and weaken	None	Stomach
Magnetic anchor method	Any	Strengthen and weaken	Required	Stomach, Colorectum
Internal traction method
S–O clip	Any	Strengthen and weaken	None	Stomach, Colorectum
Ring thread	Any	Strengthen and weaken	None	Colorectum
Multiloop	Any	Strengthen and weaken	None	Colorectum
Double clip and rubber band	Any	Strengthen and weaken	None	Colorectum
Others