Coapt GEN2 User manual

© 2021 | Coapt, LLC | 303 W Institute Pl., Suite 200 | Chicago, IL 60610 | 844.262.7800 | www.coaptengineering.com
HANDBOOK (V 3.2)
EVALUATION
KIT

© 2021 | Coapt, LLC | 303 W Institute Pl., Suite 200 | Chicago, IL 60610 | 844.262.7800 | www.coaptengineering.com
Caution: Federal law restricts this device to sale by or on the order of a physician.

HANDBOOK (V 3 . 2 ) GEN2 EVALUATION KIT
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CONTENTS
CONTENTS ............................................................................................................................................................................................. 1
USER ASSISTANCE & SAFETY........................................................................................................................................................ 3
USER ASSISTANCE.................................................................................................................................................................................................................... 3
GENERAL WARNINGS AND PRECAUTIONS ......................................................................................................................................................... 3
LABEL SYMBOL DESCRIPTIONS.................................................................................................................................................................................... 5
OVERVIEW ........................................................................................................................................................................................... 6
DESCRIPTION ............................................................................................................................................................................................................................... 6
PURPOSE......................................................................................................................................................................................................................................... 6
PATTERN RECOGNITION INTRODUCTION ............................................................................................................................................................ 7
What Is Coapt Pattern Recognition?.................................................................................................................................................................... 7
Benefits of Pattern Recognition Over Standard Myoelectric Prosthesis Control ............................................................... 7
What Is Key to Making Pattern Recognition Function at Its Best? ............................................................................................... 8
Practicing Pattern Recognition Control.............................................................................................................................................................8
Successful Use of Pattern Recognition Control Relies on Two Priorities:..................................................................................8
INDICATIONS FOR USE.........................................................................................................................................................................................................8
CONDITIONS FOR USE.......................................................................................................................................................................................................... 9
LIMITATIONS.................................................................................................................................................................................................................................. 9
IN THE KIT........................................................................................................................................................................................................................................ 9
ACCESSORIES............................................................................................................................................................................................................................. 10
EMG Interface Cable ........................................................................................................................................................................................................ 10
Electrodes ..................................................................................................................................................................................................................................11
CLINICIAN GUIDE ..............................................................................................................................................................................12
PLANNING EMG ELECTRODE SITES FOR COAPT GEN2TM PATTERN RECOGNITION ..........................................................12
Step 1: Have a thorough discovery chat with your user .........................................................................................................................13
Step 2: Determine where there is underlying muscle tissue on the residual limb...........................................................15
PLACING AND CONNECTING COAPT ELECTRODE CONTACTS...........................................................................................................17
EVALUATION KIT INSTRUCTIONS..............................................................................................................................................20
CHARGING ................................................................................................................................................................................................................................... 20
POWERING ON ..........................................................................................................................................................................................................................21
CONNECTING AN EMG INTERFACE CABLE.........................................................................................................................................................21
BLUETOOTH CONNECTION ............................................................................................................................................................................................22
SOFTWARE/APPLICATION SETUP..............................................................................................................................................................................22
CALIBRATING PATTERN RECOGNTION CONTROL .......................................................................................................................................22
Calibrating control on-screen (via mobile or desktop)..........................................................................................................................23
CALIBRATION ADAPTATION: ADAPTIVE ADVANCE®.................................................................................................................................25
CALIBRATION: ADDITIONAL TOOLS .........................................................................................................................................................................25
Calibration Clearing/Resetting ................................................................................................................................................................................25
Calibration Undo’s ............................................................................................................................................................................................................ 26
Calibration Restore Points...........................................................................................................................................................................................27
CONTROL COACH®............................................................................................................................................................................................................... 28

HANDBOOK (V 3 . 2 ) GEN2 EVALUATION KIT
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Control Coach®Quality Rating System........................................................................................................................................................... 28
Using Control Coach®Information..................................................................................................................................................................... 29
The Control Coach®“Check Engine” Light................................................................................................................................................... 29
BUTTON SOUNDS & LED COLORS............................................................................................................................................................................ 30
COMPLETE CONTROLROOM GEN2: USER INTERFACE .................................................................................................... 32
INSTALLATION............................................................................................................................................................................................................................32
UPDATES........................................................................................................................................................................................................................................32
COMPLETE CONTROLROOM GEN2 ENVIRONMENTS............................................................................................................................... 34
Dashboard.............................................................................................................................................................................................................................. 34
Connect .....................................................................................................................................................................................................................................35
Inputs ..........................................................................................................................................................................................................................................37
Calibrate ....................................................................................................................................................................................................................................39
Actuate....................................................................................................................................................................................................................................... 41
TROUBLESHOOTING.......................................................................................................................................................................42
SETUP .............................................................................................................................................................................................................................................. 42
LIGHTS AND SOUNDS......................................................................................................................................................................................................... 42
FUNCTION/CALIBRATION................................................................................................................................................................................................ 43
SOFTWARE/APPLICATION .............................................................................................................................................................................................. 43
BLUETOOTH ...............................................................................................................................................................................................................................44
UPDATES....................................................................................................................................................................................................................................... 45
ADDITIONAL INFORMATION .......................................................................................................................................................46
LIMITED US WARRANTY....................................................................................................................................................................................................46
EXTENDED WARRANTY ....................................................................................................................................................................................................47
RETURNS....................................................................................................................................................................................................................................... 47
PRODUCT RETURN POLICY ...........................................................................................................................................................................................47
ADVERSE EVENTS..................................................................................................................................................................................................................48
TECHNICAL INFORMATION............................................................................................................................................................................................49
Power .........................................................................................................................................................................................................................................49
Operating Temperature...............................................................................................................................................................................................49
Humidity ..................................................................................................................................................................................................................................49
Transport Temperature ................................................................................................................................................................................................49
Altitude......................................................................................................................................................................................................................................49
Minimum System Requirements for Complete ControlRoom Application.........................................................................49
Physical Dimensions.......................................................................................................................................................................................................49
REGULATORY INFORMATION....................................................................................................................................................................................... 50

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USER ASSISTANCE & SAFETY
USER ASSISTANCE
Contact your prosthetist if you have difficulty operating your device. You may also contact Coapt for support
(toll free) at 844-262-7800. Additional information about connecting and using the Evaluation Kit may be found
online at www.coaptengineering.com
GENERAL WARNINGS AND PRECAUTIONS
For safety and to prevent damage to the Evaluation Kit, please read and adhere to all safety precautions found
in this handbook. In addition, please follow the safety guidelines found in the user manual(s) for any connected
electrodes or prosthetic device(s). Failure to heed all warnings and precautions could cause damage to the
device and void the warranty. The following symbol definitions pertain to warnings in this handbook and on all
device labels.
SYMBOL DEFINITIONS
Warning regarding possible risk of severe accidents or injury.
Warning regarding possible risks of accident or injury.
Warning regarding possible damage to product or equipment.
Read and follow safety instructions. Read this entire manual before operating the Evaluation
Kit. Failure to do so could result in suboptimal system performance or injury, or damage to the
device.
NEVER attempt to remove or modify the battery in any way. Maintenance, repairs and
upgrades may only be performed by Coapt, LLC. Unauthorized device modification or
disassembly could cause damage to the device resulting in device malfunction, and injury to
the user.
NO modifying or disassembling device. Do not disassemble componentry or modify in any
way. Maintenance, repairs and upgrades may only be performed by Coapt, LLC. Unauthorized
device modification or disassembly could cause damage to the device resulting in device
malfunction, and injury to the user.
Use with implanted electronic devices. Do not bring the Evaluation Kit into the immediate
proximity of active implanted devices (e.g., pacemakers, defibrillators) unless assured by a
qualified healthcare professional that it is safe to do so. Interference between the Evaluation Kit
and the implanted device could cause the implanted device to malfunction.

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Use near open flame. Use care when operating device near an open flame, and do not allow
device to remain directly over an open flame. Direct exposure to an open flame may cause the
device to exceed safe temperature limits and may cause device malfunction.
Exposure to extreme temperatures. Do not expose to extreme low (<-20ºC) or high (>45ºC)
temperatures. Exposure to extreme temperatures could cause damage to the device and minor
injury.
Use near sources of high radio frequency (RF) energy. Use caution when operating the device
in proximity to sources of high RF energy (e.g., broadcast antennas or radar systems).
Interference could cause malfunctioning of the device.
Use in a corrosive environment. Do not expose the device to excessive amounts of corrosive
substances (e.g., salt water, sweat) or clean with acetone, benzene, or similar solution. Exposure
of electronics to corrosive substances can cause damage to the device resulting in device
malfunction, and minor injury to the user.
Exposure to excessive moisture, vibration, dust, or shock. Do not expose to excessive
moisture, liquid, dust, vibration, or shock. Doing so can cause damage to the device resulting in
device malfunction, and minor injury to the user.
Crushing of device. Take care not to allow the device to become smashed or crushed. Crushing
of the device can cause device malfunction, and minor injury to the user.
Use in areas of large static buildup. Take care when operating the device in areas with large
amounts of electrostatic buildup (e.g., very low humidity). Exposure to electrostatic discharge
can cause damage to the device resulting in device malfunction, and minor injury to the user.
Opening enclosures. Never open the Evaluation Kit enclosure. Opening the enclosure could
cause permanent damage to the Evaluation Kit resulting in device malfunction and minor
injury to the user.
Use of heat guns. Do not bring a heat gun or other heating device into proximity to the
Evaluation Kit. Overheating can cause damage to the Evaluation Kit, resulting in device
malfunction and minor injury to the user.
Use with incorrect or incompatible electrodes. Make sure the Evaluation Kit is only
connected to an EMG Interface Cable referenced in this instruction manual. Use with an EMG
input that is incompatible with the system, may cause damage to and/or malfunction of the
device and could result in minor injury to the user.

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LABEL SYMBOL DESCRIPTIONS
SYMBOL
INFORMATION
EXPLANATION
Waste Electrical and
Electronic Equipment
Directive Symbol
Electrical and electronic items should not be
disposed of in your dustbin or wheelie bin, but
should be recycled.
Consult Accompanying
Documents Symbol
Please read the entire instruction manual before
using the device.
FCC Symbol
This device is certified with the United States
Federal Communications Commission.
Non-ionizing Radiation
Symbol
This device emits non-hazardous levels of non-
ionizing radiation.
CE Mark
The device is certified with the European Union
under the Medical Device Directives (93/42/EEC).
Serial Number
Signifies the identification information for the
device.
Date of Manufacture
Date the device was assembled at Coapt.
European Representative
Signifies the European Representative for Coapt.
Type BF Applied Part
The device has conductive contact with the
patient.

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OVERVIEW
DESCRIPTION
The Coapt Evaluation Kit is a handheld clinical tool created with technology from the Coapt COMPLETE
CONTROL System Gen2. COMPLETE CONTROL employs pattern recognition technology to revolutionize the
way muscles’ bioelectrical activity (electromyogram, EMG) signals are analyzed, recorded, and used for the
control of upper limb prostheses.
The Evaluation Kit allows for visualization and evaluation of myoelectric signals generated from muscle
contractions. The Evaluation Kit permits virtual practice and training for pattern recognition myoelectric control.
PURPOSE
The Coapt Evaluation Kit is intended to be used for the planning and/or practice phases of an upper limb
myoelectric prosthesis fitting with two main purposes:
1. The Evaluation Kit allows potential upper limb prosthesis users to “test drive” Coapt COMPLETE
CONTROL myoelectric pattern recognition technology. It permits visualization of EMG control signals
and enables control of a virtual prosthetic arm in real time using the COMPLETE CONTROLROOM Gen2
user interface application. The Evaluation Kit can also be used as a training tool to assist users in
enhancing their function with pattern recognition myoelectric control.
2. The Evaluation Kit assists with determining location of electrodes in the socket by allowing the clinician
to validate potential for pattern recognition myoelectric control. This enables efficient planning of the
prosthesis socket. With less time spent in the clinic searching for the best muscle control sites, more time
will be available for in-clinic functional practice.

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PATTERN RECOGNITION INTRODUCTION
What Is Coapt Pattern Recognition?
Muscles in arms and hands rarely work alone. Whenever we move our arms and hands, multiple muscles make
coordinated contractions in concert and each muscle emits its own small electrical signature (called
myoelectricity) like it is its own instrument in that orchestra. Each different arm and hand movement results in
a unique but repeatable set of these myoelectric patterns—like different songs in our concert.
Myoelectric signals are very tiny, but they can be detected by electrodes on the surface of our skin. Using a full
array of electrode contacts on the skin to cover the whole area of these underlying muscle contractions allows
all of the rich muscle pattern information be captured (akin to an array of microphones over our orchestra).
This is where pattern recognition goes to work. The complex sets of myoelectric patterns need to be “decoded”
in real time and matched to their arm or hand action. Coapt’s pattern recognition is a system of finely tuned
machine learning algorithms that does just that. Specifically, for the residual muscle signals of those with upper
limb loss or difference. For example, the pattern of myoelectric activity recorded on the residual forearm during
hand opening is different from the pattern recorded while the hand is being closed.
The Complete Control System Gen2 from Coapt listens to the myoelectric activity and uses mathematical
algorithms to determine when a pattern matches the user’s intention to make an arm or hand movement. It
then tells the prosthesis to move accordingly, providing intuitive control of multiple prosthetic movements.
Benefits of Pattern Recognition Over Standard Myoelectric Prosthesis Control
Muscle signals contain a lot of information. Pattern recognition uses the combined information gathered from
all electrodes to control multiple prosthesis movements. In contrast, standard myoelectric control only
considers the signal level from one electrode to control each prosthesis movement. In other words, standard
myoelectric control is like listening to music and only knowing how loud the sound is, while pattern recognition
is like hearing what song is playing.
Key benefits of pattern recognition over standard myoelectric control include the following:
• Intuitive Control – Natural movement intents are used to control the prosthesis, generally making it
easier to use. For example, the feeling of opening or closing a hand is used to control the prosthetic hand
open and close (instead of wrist flexion motions to control the hand common for basic myoelectric
devices).
• No Mode-Switching – There is no need to use cumbersome actions like co-contractions, pulses, fast-
slow gestures, etc. and this makes the control of a prosthesis more seamless.
• Strong muscle contractions are not required – Pattern recognition has the advantage of being able to
utilize low intensity muscle contractions as needed. This is beneficial for standard myoelectric control
users who were required to elicit strong control contractions that tire them out quickly.
• Superior Proportional Control – A wider range of control speeds are available because myoelectric
inputs do not need to be limited by thresholds and a broader range of input levels can be recognized by
the algorithms.

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• Flexible Electrode Placement – There is much less need for isolated signals or precise electrode
placements. This opens the door to more functional myotesting, freedom to place electrodes for socket,
comfort, or limb constraints and provides helpful forgiveness in prosthesis donning.
• Calibration and Setup – Control can be refined and personalized at any time using the quick on-board
calibration. This makes addressing changes in socket fit, skin condition, fatigue, desired feelings for
control much easier to take on without the need to take the prosthesis off or make extra clinic visits.
What Is Key to Making Pattern Recognition Function at Its Best?
Repeatability :Pattern recognition works best if the user can replicate the patterns of muscle signals for each
motion the same way each time. Each motion should “feel” the same each time the user performs it.
Differentiation :Pattern recognition requires the pattern of muscle signals to be different for each distinct
motion. Each motion should “feel” different from all other motions.
Practicing Pattern Recognition Control
• No need for extra-hard muscle contractions. Contraction levels should be moderate – like the feeling in
the strength of a comfortable handshake.
• Start slow and practice patience. This new pattern recognition method of control can take a little time
and practice to get used to.
• Control is not position-based. Example: if a hand is commanded to close (and it does) and the user then
wishes to turn the wrist, there’s no need to “hold” the hand closed while rotating the wrist, as each motion
is a separate activity.
• If control becomes erratic, reflect on the “feeling” of the motions when calibrated. The system does not
forget the patterns it was calibrated with, so it is always helpful to return to those perceptions as needed.
Successful Use of Pattern Recognition Control Relies on Two Priorities:
1. Placing electrodes at locations that make reliable contact with the skin.
2. Good understanding of pattern recognition calibration by the user and the practitioner.
INDICATIONS FOR USE
The Coapt Evaluation Kit is an accessory tool intended to be used during the planning and alignment of
myoelectric control contact locations for an upper limb prosthetic socket.

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CONDITIONS FOR USE
The Evaluation Kit was developed for clinical use and must not be used for unusual activities.
The Coapt Evaluation Kit should only be used by a trained and licensed medial professional or under supervision
of a trained and licensed medical professional.
See General Warnings and Precautions for more information regarding acceptable use conditions.
LIMITATIONS
Careful evaluation is required to determine if individuals with brachial plexopathy or high-level amputations
without targeted muscle reinnervation surgery could benefit from Coapt COMPLETE CONTROL. The Coapt
Evaluation Kit can aid in determining this.
IN THE KIT
The Coapt Evaluation kit is to be used in conjunction with a Coapt EMG Interface Cable (sold separately) and
the Coapt Complete ControlRoom Gen2 user interface application.
The Coapt Evaluation Kit contains the following components:
1. Evaluation Kit main unit
2. Complete Communicator USB Bluetooth Dongle – provided with the Evaluation Kit to enable Bluetooth
connection to a personal computer
3. USB Charging Cable – micro-USB cable for main unit charging via a USB port or USB IEC 62133 certified
external wall plug (wall plug not provided by Coapt)
Accessories to the Evaluation Kit not included but may be required:
1. EMG Interface Cable(s) (sold separately)
2. Coapt Dome Electrodes (if necessary, sold separately)
3. Temporary Evaluation Electrode “Stickers” (if necessary, sold separately)
1
2
3

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ACCESSORIES
EMG Interface Cable
When purchasing an Evaluation Kit, the EMG Interface Cable(s) are not included and must be ordered
separately. The Evaluation Kit is only compatible with Coapt EMG Interface Cable types shown in the table
below. Please contact a Coapt representative with any questions about EMG Interface Cable types and uses.
EMG INTERFACE
DESCRIPTION
Standard Eyelets EMG Interface
Cable
17 ring/eyelet terminations for use with a set ofCoapt Stainless Steel
Dome Electrodes
Snap Style EMG Interface Cable
17 snap terminations for use with with disposable, Temporary
Evaluation Electrode “Stickers” or set of liner-snap electrode contacts
(sold by third party)

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Evaluation-Style Cuff EMG
Interface Cable
Wrap-around, Velcro cuff for evaluation use with transradial and
small circumference transhumeral limbs
Osseointegration-Style Cuff
EMG Interface Cable
Elastic cuff for definitive Osseointegration use only
Electrodes
Coapt recommends the use of FDA cleared electrodes whenever possible.
Where the Evaluation Kit is used with an Eyelets style EMG Interface Cable, Coapt recommends the use of FDA
cleared, Coapt Dome Electrodes. Contact a Coapt representative to purchase these separately.
Where the Evaluation Kit is used with a Snap Style EMG Interface Cable, Coapt recommends the use of FDA cleared,
Temporary Evaluation Electrode “Stickers”. Contact a Coapt representative to purchase these separately.
Please contact a Coapt representative with any questions about use of other potentially compatible electrodes.
PRODUCT INFORMATION
RELATED PRODUCT REGISTRATION
510(K)
Manufacturer: Coapt, LLC
Product Name: Dome Electrodes
Part Number(s): D37C13T4L50
Proprietary Name: Dome Electrode
Registered Establishment Number: Coapt, LLC, 3010605876
Product Code and Regulation Number: GXY, 882.1320
K190416
Skin irritation. Use of non-biocompatible materials (or materials to which the user is allergic)
for electrode contacts may cause skin rash or skin irritation. Ensure electrode contacts are
made of biocompatible material and do not cause an allergic reaction.

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CLINICIAN GUIDE
PLANNING EMG ELECTRODE SITES FOR COAPT GEN2TM PATTERN
RECOGNITION
Pattern recognition loves information. The more information it can be fed, the better it will work. Valuable
myoelectric (or, EMG) control information can come from all over a user’s residual limb, so, unlike a conventional
single- or dual-site myoelectric system, you will be planning for several pattern recognition electrode contacts
to capture all their limb has to offer.
You are likely already aware that pattern recognition is quite different than conventional single- or dual-site
myoelectric control. Maybe it is no surprise that myotesting and evaluating users for electrode placement is
quite different too. Yes, there may be a higher number of electrode contacts with pattern recognition, BUT, as
you will experience, it will produce desired patient outcomes.
Here, Coapt will guide you through the two major electrode site-planning tasks:
1. Determining where there is underlying muscle tissue on the residual limb of your user.
2. Planning the Coapt electrode contacts to reliably cover those areas of residual muscle activity.

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Step 1: Have a thorough discovery chat with your user
Before you dive into any palpation for muscle activity with a prospective user, plan to have a thorough
discussion with them about what they can feel and do with their limb. Forget instructing them to imagine
isolating wrist flexion and extension or simple elbow up/down (we know—it can be hard to change old habits)
but instead, have them tell you ALL of what their fingers, hand, wrist, elbow, etc. perceptions are.
Why? Well, this is a great way for both clinicians AND users to work together, explore and learn what intuitive
motions and feelings users may want to use for their prosthesis control. Let them tell you what they can do.
And don’t mistakenly limit them by cornering them into the old “flex/extend” box.
GOALS OF THIS DISCUSSION ARE TO DETERMINE WHAT MUSCLE CONTRACTIONS
(MOTIONS) THE USER FEELS:
1. Are intuitive to use for prosthesis control.
2. Can be performed consistently.
3. Are unique for each intended prosthesis action.

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A HELPFUL APPROACH TO LEADING THIS DISCUSSION:
• Ask questions to determine what movements the user can perceive and produce with
their phantom limb, such as:
o “Can you feel your hand? Which fingers do you feel you can move?”
o “Can you imagine making a fist? What about opening your hand with your fingers
spread apart?”
o “Does it feel like your hand is squeezing down on something?”
o “Do you feel like you can turn your wrist? Does your hand stay relaxed?”
o “Does your thumb move? How far? Which direction?”
o … and so on. Remember, the goal is to learn together what more might be available
for control with more multi-site contacts.
• When you have your user perceive these motions, ask that they hold them at a medium
intensity and for about 3-4 seconds each. This is good practice for the eventual
prosthesis controls’ (and users’ self-led) calibration procedure.
• Encourage the user to mirror their perceived motions with their sound limb if possible.
• Start the discussion with the most intuitive motions and add variations as needed; i.e.
try natural hand close for “hand close” and if they have poor perception of hand close
but good perception of one specific finger (for example), try practicing the use of that
finger perception for “hand close.” In another example, if wrist rotation is difficult to
perceive, discuss the feeling of adding thumb or pinky finger ab/adduction to
accentuate rotation.
• Focus on motions that are distinct and repeatable.
• Take considerable time with this process.
• Be patient and listen.
• Perform this discussion in a relaxed environment.
• Develop a common vocabulary for specific motions.

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Step 2: Determine where there is underlying muscle tissue on the residual limb
Palpation isn’t what it used to be. For single- or dual-site, conventional myoelectric control electrode planning,
you may have been used to feeling for strong, isolated contractions using your fingertips. Forget that. For
pattern recognition go all in. Use all of your hands to feel as much of their residual limb as possible, at once.
Hold on and feel while you repeat and continue the discussion from Step 1.
Why do you want to do this? The continued discussion helps to further discover their intuitive motion plans
while, at the same time, lets you feel for the general and global areas of underlying muscle tissue. Remember,
pattern recognition doesn’t always require strong and isolated sites, it wants to get info from lots of muscle
areas—even the areas that may seem weak and hardly perceptible.
THIS WHOLE-HANDED PALPATION SHOULD:
1. Feel for all “areas of interest” corresponding to any and all underlying muscle
activity related to the control motions.
2. Keep note/remember these “areas of interest” as good locations to place
electrode contacts.

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A HELPFUL APPROACH TO PERFORMING THIS PALPATION:
• Perform this exercise in a relaxed environment
• Take time with this process.
• Be patient and listen.
• Grasp and cover as much of the user’s limb as possible; do not use only your fingertips
to feel.
• Have the user perform and hold (3-4 seconds) each of the useful motions discovered
during the discussion phase.
• Feel for the overall muscle activity – like what the pattern recognition algorithm does –
by sensing the patterns of activity at multiple areas simultaneously.
• Do not ignore areas of slight/subtle/weak underlying muscle contraction (these signals
are just as valuable).
• Note any unique and unexpected areas of underlying muscle contraction.
o For transhumeral amputees, this may mean unique muscle activity distal on their
residual limb.
• If the user tenses muscles quite hard for all motions, ask them to make contractions a
little more softly.
• If desired, make temporary markings on the user’s residual limb to help remember
areas of activity.
GENERAL THINGS TO AVOID:
• Do NOT seek only strong muscle contraction sites (subtle signals are important too)
• Do NOT focus only on precise and isolated muscle sites
• Do NOT limit electrode placement to “hotspot” areas

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PLACING AND CONNECTING COAPT ELECTRODE CONTACTS
If you’ve performed the discussion and palpation steps of
the Electrode Site Planning for Coapt pattern recognition,
you will have a good idea of the underlying muscle “areas
of interest” on your user’s residual limb. Perhaps you’ve
even made a series of temporary markings on their limb or
taken some pictures for planning.
You may be ready to place Stainless Steel Dome Electrodes
in a check socket or definitive socket/liner interface, or you
may be continuing an evaluation using the temporary
evaluation Electrode “Stickers” directly on the skin. In
either case, this section will guide you if this is your first
Coapt fitting and provide useful tips if you’re already a pro.
A few very important things to know before you get started:
• Definitive Electrode contacts with a Coapt system are solid Stainless-Steel Dome Electrodes. Each one
will be connected to a wired lead of a Coapt cable.
• Temporary Evaluation Electrode “Stickers” are single-use contacts for direct-on-skin evaluations. Each
one will be connected to a wired Snap-end lead of a Coapt Snap Style EMG Interface Cable harness.
• Two electrode contacts work together to create one “channel” of EMG information.
o If you picture an imaginary oval encircling the two placed electrode contact points, this is the
general region the EMG channel data will be from. The farther apart the pair of electrode contacts,
the larger (and deeper) the sensed area will be. Conversely, electrode contacts close to each other
will detect a more focused channel of EMG.
• The Coapt system has 8 EMG channels (16 electrode contact points) and one ground/reference contact
(17 electrode contact points in total).
• In some space-constrained fittings, the 17 Coapt Dome Electrodes can be reduced to as few as 9, by way
of contact-sharing (see below for details). Contact sharing is not possible when using the Temporary
Evaluation Electrode “Stickers” and the Snap Style EMG Interface Cable.
The most important thing to remember with electrodes: Electrodes MUST MAKE CONTACT WITH THE SKIN
to work. Electrodes that do not stay in contact with the user’s skin will lead to serious prosthesis control
limitations. Take care in planning and be sure to fabricate a well-fitting interface for all fittings.
THE POSITIONING OF ELECTRODE CONTACTS SHOULD:
1. Cover the areas of interest discovered during Palpation.
2. Plan accordingly for socket/liner constraints.

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A HELPFUL APPROACH TO POSITIONING THE ELECTRODE CONTACTS:
• Consider starting with locations that correspond to existing myosites when retrofitting
existing myoelectric users.
• Identify locations to AVOID electrode contact, such as
o Areas that will lose electrode-to-skin contact during use.
o Areas outside of socket trim-lines or co-located with valves.
o Areas that have no underlying muscle (i.e. bone only).
o Sensitive skin areas.
o Areas with active EMG during positional loading (e.g. deltoids, brachioradialis).
The Evaluation Kit connects to a Coapt EMG Interface Cable to evaluate eight EMG signal channels. To make
up a single EMG channel, a pair of passive electrode contacts work together and pick up an oval-shaped area
of muscle signal underlying these two contacts. The closer the two contacts are to each other, the smaller the
area of detected EMG and vice versa.
When using the Standard Eyelets, Snaps, or Osseointegration-style Cuff EMG Interface Cable, each EMG
channel will have its own pair of electrode contact points, plus one contact for system-wide reference/ground,
making a total of 17 contact points.
When using the Evaluation-style Cuff EMG Interface Cable, EMG channels will share some electrode contact
points, plus one contact for system-wide reference/ground, making a total of 9 contact points.
PLACING THE EVALUATION-STYLE CUFF OR OSSEOINTEGRATION-STYLE CUFF EMG INTERFACE CABLE:
For best results, clean and dampen underlying skin
areas before placing the cuff.
Fit the Evaluation-style cuff snugly around the most
muscular section of the limb being evaluated and
secure with the Velcro attachment.
Specific rotational position is not crucial but consider
aligning the connection cable with the Ulna (below
elbow) or laterally (above elbow) for repeatability.
PLACING THE STANDARD EYELETS OR SNAPS EMG INTERFACE CABLE:
Contact Spacing – Plan to place the two electrode contacts for an EMG channel approximately 30–60 mm apart.
Contact-Pair Orientation – While it is generally a good idea to align a pair of contacts in the direction of
underlying muscle fiber direction, it is ok with pattern recognition to place some of the electrode pairs “off-axis”.
This is helpful when fitting a residual limb with unique areas of EMG interest, and for geometrically unique and
congenital limb presentations.