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Physical Medicine and Rehabilitation

Myo Plus pattern recognition – 2. Preparing an interim fitting | Ottobock

Myo Plus pattern recognition – 2. Preparing an interim fitting | Ottobock

Myo Plus pattern recognition
Step 2: Preparation of an interims fitting After a successful evaluation with the Myo Cuff in step one, the 2. step is to create a Myo Plus interims prosthesis. This video demonstrates how to position and mount electrodes on the inner socket,
how to wire the system and how to test the functionality. Determine the electrode positions on the inner socket Begin by marking the direction of the ulna along the skin. Don the inner socket. Locate the ulna and mark its direction along the inner socket. Then draw a line 6 – 7cm distal to the olecranon. Place the electrode-positioning gauge distal to the drawn line. Make sure that the ulna lies between electrode number 1 and number 8. Do not place an electrode along the ulna because this position yields weak EMG signals. There is also a higher risk of electrode lifting and the electrode domes can be uncomfortable at this position. Mark each electrode position with a dot … … and write the electrode numbers 1 to 8 next to them. Now drill 5mm holes into each marked electrode position. The electrode-positioning gauge specifies 16 electrode holes. 2 additional holes must be drilled for the ground contact. Ideally, these holes lie between 2 electrodes on a position where weak muscle activity is expected and
where the electrode does not lift off. Finally deburr the drill holes. Mounting and wiring the remote-electrodes Mount the electrodes by screwing electrode domes and electrode nuts together. Insert the electrode dome from the inside and the electrode nut from the outside into the prepared hole. Different electrode dome heights can be combined if needed. Screw both parts together using the 7mm Allen key. Hand-tighten the screws. Keep in mind that the ground contact is the white cable of the 3-poled electrode… … and mount the electrode covers. Repeat this with all electrodes … Optionally, the markers can be attached at the end of the electrode cables to facilitate the wiring of the Myo Plus TR. Optionally, protect the remote electrodes with an elastic textile bandage. Now remove the covers of the Myo Plus TR from the required inputs. Do not remove the red cover of slot “A”! This slot must not be used. Then connect each electrode cable to the corresponding slot. Pay attention to the correct wiring. In addition, secure the cables with the cable protection. Assembly of socket and battery Next, insert and fix the MyoEnergy Integral battery between inner- and outer socket and mount the charging receptacle. When assembling the inner and outer socket, take care not to damage electrode cables! Wiring the electric wrist rotator Note: the wiring of the electric wrist rotator is identical for left- and right-hand prostheses. Connect the 2-poled cable of the Myo Plus TR to the left number 3 contact. Connect the 3-poled cable with the blue dot of the Myo Plus TR to the left number 2 contact. Connect the 3-poled cable without the blue dot of the Myo Plus TR to the right number 2 contact. Finally, connect the 2-poled cable of the MyoEnergy Integral to the left number 1 contact. Now, insert the electric wrist rotator into the lamination ring and fix with the lock ring. System check Connect the hand to the interims prosthesis and establish a connection to the Myo Plus App. Open the menu “Manual control” to test the functionality of the prosthesis. Move the slider in the desired direction or tap the corresponding icon to manually control the prosthesis. Now the interims prosthesis can be tested with the user.

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