Otto Bock Myo Plus User manual

Myo Plus Quick Guide
Use the following steps to connect the Myo Plus system to an iOS or Android app for training and
adjustments. These instructions are intended for Myo Plus qualified Prosthetists. Please see the full
course for detailed information on all features and functions.
Step 1: Download App
- Download the Myo Plus App to
your smart device (Apple App
Store, or Google Play)
- Open the App
- Turn-on the Myo Plus system by
holding down the charging
port until 1 beep is heard and
green light appears
Step 2: Pair Myo Plus to your smart device
- On the main menu, click on
Bluetooth Connections
- Add a new connection by
clicking on the icon. If
Bluetooth is deactivated on your
device, confirm the Bluetooth
request with ALLOW. Select the
Serial Number of the system. It
is printed on the PIN card that
came with the system
- Enter the unique PIN code found
on the card that comes with the
system
- If Bluetooth pairing request
pops up, conrm with OK
- The app is now successfully
connected to the Myo Plus
system, and the Spider Plot is
displayed
Step 3: Log-in as Clinician
- On the main menu, click on
“Login” Bluetooth Connections
- Enter Username and Un-lock
PIN
These are provided to you at the
time of qualification for Myo Plus
- Now create your own unique
password. This will be used in
the future to access clinician
mode
Step 4: Orientation of Myo Plus Cuff on limb
Orient the electrode pairs evenly around the limb; pairs 1
and 8 should be on either side of the ulna, not directly on
it. Put electrode pair 1 to the lateral aspect of the ulna,
pair 8 to the medial aspect.
Right Left

Step 5: Check connectivity of App and
pattern function
- To test Bluetooth connectivity
to electrodes and confirm all 8
are functioning, tap each set to
confirm that patterns are created
on the Spider Plot
The “Pattern Scaling Active” feature enlarges the size of
the patterns for easier viewing.
- Pattern Scaling Active
- Pattern Scaling In-Active
- Activate Pattern Scaling using
the slider at bottom of Spider
Plot screen
Step 6: Input data and create Test Set
Before recording data, the type of hand should be
designated:
- In the Main menu, click on
“MyoCuff”
Choose either bebionic or
Myobock hand for the simulation
Click on “Basic Set” in the Main menu
- If training for powered rotation,
activate the rotation slider
- Choose left or right limb
- Indicate the number of electrode
pairs being used by adjusting
the slider; 8 is default
- Select pause time between
recording sets; 4 seconds is
default
The test set consists of two recordings in the 90 degree
bent arm position – by clicking on the green arrow the
recording page is displayed.
In each recording, five movement patterns must
be performed in order: Relax, open, close, supinate,
pronate.
- Press the button to begin
recording
- During the blue phase, the limb
should be relaxed
- During the red phase, the limb
should be creating the desired
motion (except in the first
recording of relaxation state)
- The contraction strength should
be 0% at the beginning of
the red phase and should be
continuously increased to 80%
of maximum contraction strength
towards the end

After both recordings have been performed, make sure
that both recordings set are selected (check mark).
By scrolling down and clicking on “Create test set”, a
test set is created from the two recordings and stored
temporarily in the Myo cuff ➞ The test set is lost after
switching off the Myo cuff.
Step 7: Test reliability of the patterns
The user can now test the reliability of the control in real
time in the menu “Spiderplot / Training”
- Each shape represents a pattern
of muscle activity
- Each function in the prosthesis is
assigned a colored box, which
can be seen by scrolling down
below the plot
- As the muscle pattern is created,
the corresponding colored
shape will fill with gray
- As the user recreates each
recorded pattern, the function
activated in the hand is
displayed by the hand symbol
- By checking or unchecking
individual motions, patterns can
be removed or added to the
spider plot to ease evaluation
when necessary
- By swiping to the left on the
Spider Plot, the movement
display will appear
- The red bar indicates current
relative contraction strength
- The hand symbol indicates the
movement pattern currently
being detected. A strong
pattern is indicated by a solid
appearance…a weak pattern
would “flicker” between
multiple movement pictures
Evaluate the prosthetic control together with the user by
using the spider plot and/or the movement display.
If the prosthesis control is working reliably, continue
with the basic set. Reliably means that the prosthesis
generates the desired movements and the user has little or
no problems with the execution of the movement patterns.
Test all recorded movements using the Spider Plot or
Movement Display.
Step 8: Create Basic Set
- As before, click on the arrows
for the additional 2 arm
positions: Arm Hanging, and
Arm Extended
- For each arm position, record 2
sets of data. When all 6 sets are
checked, click on “Creating the
Basic Set”
- A basic set can only be created
when all 6 recordings have been
made
Troubleshooting basic control
Poor quality of motion or accuracy:
After creating the basic set, if certain motions or arm
positions create poor movement quality, you may uncheck
those data sets, then click on “Creating a Test Set” to
evaluate movement quality without the suspected poor
data.
If control has improved, re-record the unchecked data set,
and create a new Basic Set. Test function again.
Difficulty creating differentiated patterns:
Make sure the user is trying to create motions in their
phantom limb that they can imagine doing. Be sure to have
a clear understanding of how their phantom limb feels, and
what “motions” they can try to create.
The quality of the Basic Set is of great importance as it
creates the foundation for how the system operates and
recognizes muscle activity patterns.
Once a reliable Basic Set has been created, additional
grip patterns can be added.

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Step 9: Additional Grip Patterns
- To add other grip patterns, click
on “Add pattern” on the main
menu
- 8 grip functions may be added
by creating 4 additional muscle
patterns
- Each additional pattern will
create 2 grips depending on the
position of the thumb. These
pairs are pre-determined and
cannot be modified
Click on the grasp(s) to be added, then click on “Continue
to recording” at the bottom of the screen.
After recording, the following message will appear:
Click “Accept” to keep, “Discard” to re-record. The
recording can be tested while this window is up prior
to choosing discard or accept.
- In the “Add pattern” menu,
additional recordings of hand
open/close and pronate/supinate
may be created
- This may be useful if the user
finds that control for a certain
function is not adequate in
certain arm positions
- Click on the movement, then
click “Continue to recording” to
add additional layer(s) of data
with arm in any chosen position
Tips
Before recording data, be sure to have a conversation with
the user to determine what phantom limb motions they feel
they can try to create. Have them do the same motion on
the contralateral limb if they are a unilateral amputee.
It is important that each pattern be clearly different from
other patterns. If they are not, coach the user to try and
recruit slightly different muscle activity. For example,
consider having them lead pronation or supination with the
thumb or small finger to recruit more muscle activity.
- Good Differentiation
- Poor Differentiation
Set to Default
If using your system to evaluate more than one potential
user, be sure to reset the system back to manufacturer’s
settings before testing a new user.
This is found in the Settings menu, under “Advanced
Settings” - “Set to Default”. This will close the app and
disconnect from the Myo Plus system.
Additional information, including video tutorials, can be
found on the Ottobock web site, YouTube, or by calling our
technical support team.
©2019 Otto Bock HealthCare LP · 17736 12/19