Bagnoli desktop system

The prosthesis consists of a custom thermoplastic socket that can be worn by non-amputee participants and a voluntary-closing hook-style terminal device (maximum aperture 83 mm). A Bowden cable connects the terminal device to a custom motorized linear actuator to control device opening and closing. This same prosthesis and actuator have been used and described in more detail in Thomas et al.^{9 (link),22 (link)}. A counterweight system was attached to the terminal device to simulate the loading conditions typically experienced by transradial amputees; it offset 500 g of the prosthesis’s 800 g mass.
The motorized linear actuator is driven in proportional, open-loop speed control mode by surface electromyography signals (sEMG) from the wrist flexor and extensor muscle groups. sEMG signals were acquired using a 16-channel Delsys Bagnoli Desktop system.

While the patient was walking, a Bagnoli Desktop System (Delsys Inc., Boston, MA, USA) was used to record surface EMG on right and left gluteus maximus (Glut), quadriceps femoris (Quad), adductor femoris (Add), hamstrings (Hamst), tibialis anterior (TA), lateral and medial gastrocnemius (GLat and Gmed), and soleus (Sol). A total of 16 electrodes were placed on the muscles with double-sided adhesive skin interfaces. Using the Teraview^® ver. 1.3.49 software (Medical Try System, Tokyo, Japan) (Sato et al., 2007 ) the EMG were integrated with the video data recorded simultaneously during walking with a digital video camera (Panasonic NV-GS300, 30 fps). From the video images, heel strike was visually determined for each gait cycle (comprising heel strike, stance, swing, next heel strike).