Design of a lightweight passive orthosis for tremor suppression

Table 1 Stiffness of air-structure at the inflation stages A, B, C, compared to human wrist stiffness and two medical dorsal orthosis for wrist deflection in flexion, extension, ulnar and radial deviation and the drive back

Movement	Stiffness in mNm/rad
	Air-structure			Human wrist [49]	Smart Glove, IMAK^a [50]	The Clutch, PRO-TEC ATHLETICS^a [50]
	A:40 ml	B:60 ml	C:80 ml	Human wrist [49]	Smart Glove, IMAK^a [50]	The Clutch, PRO-TEC ATHLETICS^a [50]
Flexion (φ < 0)
Deflection	507	620	667	554	200	1500
Drive back	220	325	408	554	200	1500
Extension (φ > 0)
Deflection	404	560	633	1021	200	1500
Drive back	230	191	159	1021	200	1500
Radial deviation (ϑ > 0)
Deflection	152	320	493	1710	300	1500
Drive back	152	300	334	1710	300	1500
Ulnar deviation (ϑ < 0)
Deflection	152	320	493	1245	300	1500
Drive back	152	300	334	1245	300	1500

^a 1-DOF Stiffness converted from 2-DOF stiffness ellipse parameters (orthosis #4 and #6)

ISSN: 1743-0003