Otto Bock SensorHand Series Instructions For Use Manual page 30

9.5 Program 5:
With this program, the opening speed is determined by speed and level of muscle tension. Until
reaching a minimal grip force of approx. 10 N closing speed is dependent on muscle relaxation
speed. Grip force is determined by the following or the simultaneous muscle signal to the sec-
ond electrode.
FlexiGrip is effective, depending on the initial grip strength, at slightly over the maximal
AutoGrasp Grip Force. Once the grasp is secure, the SensorHand Speed reverts to the initial
grip force.
Electrode 1:
Proportional. The opening speed is determined by speed and level of muscle
Open:
tension.
Proportional. The closing speed is determined by speed and level of muscle
Close:
relaxation. Grip force is approx. 10 N.
with very slow muscle relaxation to the electrode; Hand stops in an opened
Stop:
position
Electrode 2:
Gripping: Grip force build­up is determined by the level of the muscle signal to the
second electrode. Maximal grip force is approx.100 N.
Example 1: After opening, the amputee relaxes the muscle. Closing takes place
proportionally to the muscle relaxation. The object is gripped with minimal grip
force (10 N). FlexiGrip is effective at 20 N. Once the object is securely grasped,
the SensorHand Speed reverts to the minimal grip force.
Example 2: After gripping, as described in Example 1, the object must be grasped with
a higher grip force. The amputee must create a muscle signal to the second
electrode. Proportionally a grip force between 10 N and 100 N can be built-
up. If the object starts to slip the grip force is increased up to 50%. FlexiGrip
is effective at approx. the double value of the initial grip strength up to 130 N.
Once the object is securely grasped, the SensorHand Speed reverts to the
initial grip force.
Program 5: 2 Electrodes VarioDual (yellow coding plug)
Open
Speed and level of
muscle tension to
the 1st electrode
Speed:
proportional
15 mm/s to
300 mm/s
30 | Ottobock
VarioDual
Yellow coding plug
Control with 2 electrodes
Close
Close:
Speed and level of
muscle relaxation to the
1st electrode
Speed: proportional
15 mm/s to 300 mm/s
Grip force build­up:
Grip force dependent on
level of muscle signal to
2nd electrode.
Grip force:
proportional
10 N to 130 N
Initial Grip AutoGrasp Grip
Strength Force Increase
10 N No AutoGrasp
Propor- proportional:
tional: up to max. 1,5-
10 N to fold of initial grip
100 N strength
FlexiGrip Function
effective at 20 N
dependent on
initial grip stength,
effective at slightly
over the maximal
grip force increase
min. from 20 N
max. from 130 N
SensorHand Speed