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Chapter 11: Configuring the Arm Using the Prosthetist Interface
Figure 126. Activate/Zero IMUs
3.
Communicate and demonstrate to your client that the IMUs, mounted on each
foot, function by measuring the pitch (anterior/posterior movements) and roll
(medial/lateral movements) of the client’s foot.
4.
Configure the Upper and Lower Gains for the Left IMU.
Adjust the Upper and Lower Gain dials so that full signal is displayed on the bar
graph when the client pitches and rolls the IMU at a comfortable maximum
position.
5.
Configure the Thresholds for the left IMU.
Start with an input threshold setting of 15 to 20 above the resting signal level
and the IMU axes configured to coupled.
When configuring Thresholds in a coupled configuration the goal is to set
thresholds to prevent unintended crosstalk of pitch and roll commands while
making the activation range as symmetrical as possible in the coupled
movement directions (anterior/posterior and medial/lateral). This is
accomplished by:
a.
Setting the Anterior and Posterior Thresholds such that Medial and Lateral
movements do not cause the Anterior/Posterior signal level to cross the
thresholds and cause unintended motions.
The client should be standing during IMU configuration as there is less
freedom of movement when the client is bearing weight on their feet.
