This document summarizes new prosthetic hands from Otto Bock that feature improved control systems. The DMC Plus allows proportional control of grip speed and force based on muscle signals, and has a safety mode where higher muscle signal is needed to open the hand after gripping. The Digital Twin system provides both digital and double channel control options in one hand. Both systems can be optimized for use with Otto Bock's new lithium-ion battery and have automatic controls and safety features. The document provides product codes and technical specifications for the DMC Plus and Digital Twin hands.

1. ©OttoBock·646S1=6.99GB/IND-06.04
Otto Bock HealthCare India Pvt. Ltd.
Behind Fairlawn Housing Society · Sion Trombay Road · Chembur · IND–Mumbai 400 071 · Tel. +91 22 2520-1268 · Fax +91 22 2520-1267
e-mail: otto@bom5.vsnl.net.in · www.ottobockindia.com
A Sleight of Hand
DMC (Dynamic Mode Control) sets a new standard in myoelectric prosthet-
ics: Grip speed and grip force are controlled proportional to the strength of the
muscle signal. For response characteristics that are even more sensitive, there's
the new DMC Plus. This control also features a new type of safety mode: After
gripping once with maximum force, a slightly higher EMG signal is required to
open the hand. This reduces the chances of the hand opening due to uninten-
tional muscle contraction.
Digital Twin Control combines the two classical Digital Control
and Double Channel Control (Single Site) into one hand. This way the prosthetist
may decide which control mode is best suited for the patient.
The new Otto Bock System Hands with DMC Plus and Digital Twin Control can
be optimized for use with the new Otto Bock Lithium-Ion Energypack.
System Hand DMC plus
System Hand Digital Twin

2. DMC plus/Digital Twin
Every DMC Plus and Digital Twin Hand is equipped with automatic
electronics, an integrated on/off switch, energy-efficient bevel gear,
positive back lock, and a System Inner Hand.
An intelligent "battery manager" alerts the patient when the voltage
is low: The System Electric Hand slows down, and the gripping
force decreases. At the same time the battery is protected against
harmful total discharge.
DMC Plus Hands and Digital Twin Hands can be optimized for
use with the 757B20 Li-Ion Energypack.
Otto Bock DMC Plus System Electric Hands, =6
Two independent systems precisely control the grip speed and
grip force of the hand in proportion to the strength of the mus-
cle signal. The gripping process is much more natural, and it is
easier to gently grip small or fragile objects. The prosthetist may
choose from two different control modes by inserting or removing
a function plug:
DMC Mode: Proportional control of grip speed and grip force.
DMC Plus Mode: Proportional control of grip speed and grip force.
After gripping once with maximum force, a slightly higher EMG
signal is required to open the hand. This reduces the chances of
the hand opening due to unintentional muscle contraction.
Otto Bock Digital Twin System Electric Hands, =7
The Digital Twin Control system provides both a digital control
mode (dual site) and a double channel control mode (single site)
in the same terminal device. The prosthetist decides whether to
use 1 or 2 electrodes to control the prosthesis. The desired control
mode is selected by inserting or removing a function plug.
8E38=6 Otto Bock DMC Plus System
Electric Hand with Quick-Disconnect
Wrist
8E38=7 Otto Bock Digital Twin
System Electric Hand with Quick-
Disconnect Wrist
Suitable for all amputation levels
except wrist disarticulation. Passive
wrist rotation with ratchet lock (can be
replaced by the 11S30 Friction Ring).
Central coaxial plug connection.
8E41=6 Otto Bock DMC Plus Sys-
tem Electric Hand with Threaded
Stud M12x1,5
8E41=7 Otto Bock Digital Twin Sys-
tem Electric Hand with Threaded
Stud M12x1,5
Suitable for all amputation levels
except wrist disarticulation. Cable
guides through center of stud.
8E39=6 Otto Bock DMC Plus System
Electric Hand with Lamination Ring
8E39=7 Otto Bock Digital Twin Sys-
tem Electric Hand with Lamination
Ring
Suitable for wrist disarticulation.
Passive wrist rotation with friction;
centrally-guided flat cable.
Tecnical Data
Static current: 1 mA
Operating temperature: 0-70 °C
Opening width: 100 mm
Proportional speed (DMC Plus): 15-130 mm/S
Proportional grip force (DMC Plus): 0-90 N
Proportional speed (DMC Plus): 110 mm/S
Grip force (Digital Twin): 90 N
Power source: EnergyPack 757B20 / 757B21 - 7,2 V - Li-Ion
X-ChangePack 757315 - 6 V - NiML
Otto Bock NiCad Battery 757B8 - 6 V - NiCd