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ELECTRODE ARRANGEMENT:
TRANSRADIAL
LIMB
Each electrode should have signal for at least one movement. If this strategy
does not yield signal on an electrode for any movement, first try rotating
the placements slightly, making sure no electrodes fall over boney parts, or
try moving the electrodes along the axis of the residual limb. If the issue
persists, follow the guidance laid out for transhumeral prostheses.
Transhumeral Prostheses
Transhumeral residual limbs generally require more specific site location.
Ask the user if they feel any phantom limb movements in particular locations
on their residual limb. Palpate the limb while asking the user to attempt
movements with their phantom limb, including "open", "close", "pronate",
"supinate", "elbow flexion" and "elbow extension".
properties of signals when determining sites for Sense:
•
Ideal locations exhibit high signal strength for 1-2 different movements
and lower signal strength for any number of other movements.
•
Each electrode should activate to some degree for at least one
movement.
•
No electrode should activate at medium-high strength for all movements.
ELBOW JOINT
Look for the following
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ELECTRODE ARRANGEMENT:
TRANSHUMERAL
Once ideal muscle sites have been found, mark them temporarily on the
residual limb and make note of them on a check socket, a plaster cast or
other limb model before proceeding to the remaining fabrication steps. The
table below provides key points for identifying good electrode sites:
Good Sites
•
Medium activation for 1-2
movements and lower
amplitude for others
•
Are not identical to other
electrode sites in their activation
pattern
•
Do not have the same strength
for all movements
WARNING: Ensure IBT Electrodes are placed only on intact skin.
WARNING: After removing the prosthesis, always check for skin
irritation and pressure sores under the electrode sites. If irritation
is present, discontinue the use of the prosthesis until the skin is
healed and check if socket adjustments are necessary to alleviate
pressure.
ELECTRODE ARRANGEMENT EXAMPLE
Poor Sites
•
On bony prominences
•
On skin with thin tissue (will
cause sores)
•
In areas where the tissue will
pull away from the socket
•
In areas where there may be
gapping between the skin and
the socket in different arm
orientations
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