Table 1. Comparison of different endoscopic system for spinal stenosis decompression.

Variable	RIWO Vertebris stenosis	Joimax iLESSYSDelta	Elliquence	Spinedos LUSTAstenosis	Maxmore S-GUN
Scope profile	OD: 9.3×7.4 mm; WC:5.6 mm; angle: 20°;WL: 117 mm	OD: 10 mm; WC:6.0 mm; angle: 15°o; WL: 125 mm	OD: 10 mm; WC:7.1 mm; angle: 15°; WL: 139 mm	OD: 9.3×7.4 mm;WC:7.1 mm; angle: 20°; WL: 117 mm	OD: 9.0 mm; WC:5.5 mm; angle: 11°; WL: 90 mm
Motor system	40,000 rpm	40,000 rpm	50,000 rpm	50,000 rpm	40,000 rpm
Special designed instruments	Articulating bone burr (4.0 mm); oval burr with side guard	Larger diameter endoscopic burr	Bent upwards endoscopic Kerrison	Articulating burr; curved punch; bone biting forceps	Outer tube of endoscopic burr with distal protection
Maximum size of instruments	Kerrison: 5.5 mm; Burr OD: 5.5 mm	Kerrison: 5.5 mm; Burr OD: 5.5 mm	Kerrison: 6.0 mm; Burr OD: 6.0 mm	Kerrison: 6.0 mm; Burr OD: 5 mm	Kerrison: 5.0 mm; Burr OD:4.0 mm

OD, outer diameter; WC, working channel; WL, working length.