Table I.

Main differences between current generation Watchman and Watchman FLX LAA Closure System

Parameter	Watchman	Watchman FLX
Sizes	21, 24, 27, 30 and 33 mm to treat ostia measuring from 17 mm to 30.5 mm in width	20, 24, 27, 31 and 35 mm to treat ostia measuring from 15 mm to 32 mm in width
Design of distal end	Open distal end	Atraumatic closed distal end with a fluoroscopic marker
Anchors	10 in one row	12 in two rows
Struts in frame	10	18
Sheath	14 Fr (all sizes)	14 Fr (all sizes)
Recommended compression	8–20%	10–27%
Proximal facing screw	Recessed screw hub	Flat and recessed screw hub
Redeployment after recapture	Proximal redeployment after partial recapture only	Redeployment after full or partial recapture