COVVI THE NEXUS HAND User manual

www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
Technical Manual
THE NEXUS HAND

Anything Is
Possible

Foreword
COVVI was founded in 2017 by a passionate and experienced team who wanted to
continue to create leading prosthetic designs.
The human hand is amazing and the level of functionality which can be restored through
prosthetics has historically been very low; but as engineers and designers we see this
as a challenge to continuously improve our designs to meet the needs of users. COVVI
started with a blank sheet of paper and a mission to address some of the most prevalent
deficiencies of current prosthetic hands.
Fast forward to present day and we now have the fastest, strongest, and best-looking
prosthetic hand in the market.
The COVVI Team

00 | Page 04www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
Introduction 6
1.1 What Defines Us? 6
1.2 The Path to the Nexus Hand 6
What’s Inside 7
2.1 The Nexus Hand and Advantage Kit 7
Safety Precautions 8
Environmental Conditions 10
The Nexus Hand 11
5.1 The Hand Box 11
5.2 Dimensions 12
5.3 Nexus Hand Overview 13
5.4 Technical Information 15
Fitting the Nexus Hand 16
6.1 Connecting/Disconnecting the Nexus Hand 16
6.2 E-Paper Screen 18
6.3 System Notifications 19
Nexus Hand Features 21
7.1 Passively Flexing Fingers and Thumb 21
7.2 Integrated Flex Wrist 22
7.3 Water and Dust Resistance (IP44) 22
7.4 Powered Thumb Rotation/Intuitive Thumb Control for Smart Switching 23
Grip Patterns 24
8.1 Opposed Grips 24
8.2 Non-opposed Grips 26
The COVVI Power Supply 28
9.1 What’s Inside 29
9.2 Safety Precautions 31
9.3 1600mAh Batteries 32
9.4 2600mAh Batteries 33
9.5 Activating the System 34
9.6 Changing the Display Mode 35
9.7 Charge Indication 36
9.8 Fitting the COVVI Power Supply 38
9.9 System Specification 40
9.10 Battery Replacement 42
Contents

00 | Page 05www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
Contents
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
Electrodes 43
10.1 Safety Precautions 44
10.2 What’s Inside 45
10.3 Product Specification 46
10.4 Regional Filtering 47
10.5 Installation 48
10.6 Typical Assembly 52
Component Compatibility 54
COVVI Go App 58
12.1 COVVI Go 58
12.2 Registration 59
12.3 Hand Selection 59
12.4 Input Graph 61
12.5 Input Gain 63
12.6 Setup Wizard 65
12.7 Sensor Interface Screen 65
12.8 Operating Modes 67
12.9 Grip Tables 68
12.10 Grip Switch Triggers 70
12.11 Additional Setup 72
12.12 Changes 75
12.13 Advanced Configuration 76
12.14 Config History 77
12.15 Report a Bug 77
12.16 Remote Firmware Updates 78
12.17 Reset Hand 79
Maintenance 80
Warranty 81
14.1 24-Month Manufacturer’s Warranty 81
14.2 Optional Extended Warranty of up to 36 Additional Months 82
Warranty Service and Repairs 83
15.1 Limited Liability 83
Returns 84
Disposal 85
Symbols Used 86
CE Declaration of Conformity 87

00 | Page 06www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
1.0 Introduction
Our name was formulated to reflect our single driving intention to change multiple lives together forever through
harnessing endless connections to make anything possible. With our name came our ‘delta’ logo, which also
has meaningful origins as a symbol of change and doing things dierently.
1.1 What Defines Us?
COVVI is a portmanteau of the Latin ‘Coperor’ and ‘Vita’, translating as ‘working together’ and ‘life’.
1.2 The Path to the Nexus Hand
The Nexus Hand was born from a genuine passion for prosthetics and helping others. Through 10 years of
working in the industry alongside clinicians and listening to users we have developed a sincere appreciation
for how dicult prosthetics are to use and how poor devices do not address or resolve this. After the initial
excitement of a new device, these frustrations frequently result in the prosthetic device being rejected, which
we see as a personal failure. In today’s world there are so many products and designs that we simply do
not need, yet in the field of prosthetics so much is still to be done. As a team we could not envisage more
rewarding work than developing a cutting-edge prosthetic hand that overcomes as many of these issues as
possible, so we made it our absolute mission to do so. We truly want to reduce the restrictions and limitations
prosthetic users face every day.
We designed the Nexus Hand with your patient in the forefront of our minds and we want it to be an invaluable
tool in their life. Our two main goals were to make it functional and robust, and we are confident it not only
enables the easy performance of daily tasks but can withstand anything life throws at it! We always aim to
develop desirable products, which is why we use only the best materials and pride ourselves on our unrivalled
industrial design. After years of hard work, drive, and passion it makes us immensely proud to see our design
working as intended and actively simplifying people’s lives.

00 | Page 07www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
CCOUP
Coupling Piece
CAXCOR
Coaxial Core
& CLAMRG-##
Lamination Ring
*COVPS-1600 Shown
**These are located on the underside of the foam with the electrodes
CEL-##
2x Electrodes
COVSWC
Wall Charger
Gain Adjuster
& CELCAB-###
Electrode
Cables**
Control Panel
Nexus Hand
COVPS-1600 - Prismatic*
COVPS-2600 - Cylindrical
2.0 What’s Inside
2.1 The Nexus Hand and Advantage Kit

00 | Page 08www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
The Nexus Hand should only be fitted by a Certified Prosthetist. Clinicians can remove the glove from the hand,
but no other disassembly can be performed unless you have received training by a COVVI representative and
received a certificate. COVVI Ltd. and COVVI USA INC have the right to void the warranty of all products that
have any type of modification or damage caused by any unauthorised or untrained personnel.
• Do NOT use the Nexus Hand without the integrated glove as this could result in increased electromagnetic
emissions or decreased electromagnetic immunity and result in improper operation.
• If the glove is punctured it will aect the IP44 water and dust resistance protection for the hand.
• Do NOT attempt to use the Nexus Hand while the batteries are charging. When the batteries are charging,
the power will automatically turn o. If for any reason the power does not turn o while charging, using
the hand can be potentially unsafe.
• Do NOT use the Nexus Hand if a failure occurs, as it could cause damage to your patient or others.
• The Essential Performance is to move the digits only when an input signal is applied. Should the fingers
and/or thumb move without an input, the user should stop using the Nexus Hand immediately and contact
COVVI Customer Services.
• This symbol is used in instances to warn about hazardous or dangerous materials and/or objects and will
be used throughout this document.
• We do not recommend the use of carbon fibre materials in a fabricated socket unless it is grounded to the
carbon fibre lamination.
• This product uses semiconductors that can be damaged by electrostatic discharge (ESD).
Please read the following safety precautions prior to fitting the Nexus Hand.
Please note that the Nexus Hand is recommended with COVVI products.
3.0 Safety Precautions
CAUTION
PRECAUTIONS FOR HANDLING
ELECTROSTATIC SENSITIVE DEVICES.

00 | Page 09www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
• Individuals who are exposed to hazardous environments that contain flammable liquid or gas should NOT
operate the Nexus Hand when in those environments.
• Do NOT subject the Nexus Hand to intentional excessive impacts. Any damage caused by intentional harm
or neglect will not be covered under the warranty.
• The Nexus Hand has been tested and certified with IP44 rating, which classifies the degree of protection
against solids and water as protected against solid objects over 1mm in diameter and sprays or splashes
from all directions. The wrist interface is not IP44 water or dust resistant as it is highly dependent on the
individual socket build and so should be kept dry at all times. Do NOT submerge the Nexus Hand in water.
Any damage caused by intentional submersion in water will not be covered under the warranty.
• Do NOT expose the Nexus Hand to an open flame.
• Do NOT expose the Nexus Hand to chemicals such as solvents, acids, alkalis, corrosive substances,
detergents, and similar chemicals as this could damage the components in the hand. If the hand needs
cleaning, mild soap and a soft damp cloth should be used. Abrasive cleaners and cleaning cloths will
scratch the covers.
• Before operating a vehicle with the Nexus Hand, local regulations should be checked, and the user’s
insurance company must be notified. We recommend that the prosthesis is fully charged. In the event of
an accident occurring while operating a vehicle with a Nexus Hand or any other COVVI product; COVVI
Ltd. and COVVI USA INC shall not be liable under any circumstances.
• Do NOT use the Nexus Hand to operate a firearm.
• The Nexus Hand is not suitable for extreme sports. These include, but are not limited to: base jumping,
sky diving, downhill/endure mountain biking, motocross, rock climbing, abseiling, bouldering and power
lifting. Any sport that would involve the Nexus Hand getting wet must be avoided. These include, but are
not limited to: diving, swimming, snorkelling, surfing, kayaking and canoeing.
3.0 Safety Precautions

00 | Page 10www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
Maximum Temperature 104°F / 40°C
Minimum Temperature -4°F / -20°C
Humidity Maximum 80%, non-condensing
Pressure 101.3kPa / 14.7psi
The Nexus Hand is to be used exclusively for prosthetic fittings of upper limbs. Based on the environmental
conditions below, the user should not use, transport, or store the Nexus Hand outside of the boundaries
listed below.
4.0 Environmental Conditions

00 | Page 11www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
5.0 The Nexus Hand
5.1 The Hand Box
To remove the Nexus Hand from its box, first slide foam piece 1 vertically out of the box, then slide the rest of
the foam pieces along into the gap left by foam piece 1. Lift the hand from the box and remove foam piece 2
from the EQD and foam piece 5 from the fingers. To place the hand back in the box, follow the steps in reverse.
Please take care with the orientation of the foam pieces.
Right
Knuckle Foam
Order of Disassembly
Removable Insert for
Medium & Large
Left
2 3 5 4 1

00 | Page 12www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
5.0 The Nexus Hand
Dimensions
Small Medium Large
Key Inches mm Inches mm Inches mm
Middle Fingertip to Hand Base A 6.61 165 7.25 184 7.7 5 196
Thumb Tip to Hand Base B 4.46 110 4.5 114.5 4.8 124
Max Chassis Width C 2.76 70 3 75 3.1 80
Diameter of Chassis at Wrist D 1.85 47 1.85 47 1.9 50
Palm Circumference G7.3 190 7.6 195 7. 8 200
Maximum Opening Width - Tripod Grip H 4.4 110 4.4 115 4.8 120
Thumb Swing Through Angle 81° 81° 81° 81° 81° 81°
Middle Fingertip to Flex Axis E 6.2 158 6.8 175 7.4 187
Thumb Tip to Flex Axis F 4 102 4.1 103.5 4.4 113
EQD Only X 0.98 3 0.98 3 0.98 3
Wrist
Flexion Axis
5.2 Dimensions
C
G
A
B
E
H
F
D X

00 | Page 13www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
5.0 The Nexus Hand
5.3 Nexus Hand Overview
Stainless Steel
Finger Pivot
E-Paper Screen
High Impact
Polymer Chassis
Stainless Steel
Knuckle
Cast Aluminium Digit
Components
Stainless Steel
Finger Link
Stainless Steel
Finger Chassis
Machined Aluminium
Wrist Housing
High Chromium
Steel Wrist Plate
ESD Pathway
Stainless Steel
Thumb Pivot

00 | Page 14www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
5.0 The Nexus Hand
Flexible Glove
EQD - Electric Quick Disconnect
Palm Grip Surface
E-Paper Screen
Rigid Covers
Dorsal Button
Wrist Lock Button

00 | Page 15www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
Maximum Hand Load Limit (A) with force applied upwards
90 kg / 198 lbs over the knuckles
Maximum Hand Load Limit (B) picking weight up
32 kg / 70.5 lbs
Avoid pressure on thumb
5.0 The Nexus Hand
Nexus Hand Voltage 7 to 8.4V
Maximum Current Consumption 5A (1600mAh) / 8A (2600mAh)
Device Weight 0.57kg / 1.25 lbs
Maximum Hand Load Limit (A) 90kg / 198 lbs across knuckle
Maximum Finger Load Limit 16kg / 35 lbs
Full Open to Full Close 0.7 seconds to achieve grip
Tripod Grip 0.4 seconds to achieve grip
Tripod Grip Force 45N / 10 lbf
Power Grip Force 80N / 18 lbf
Key Grip Force 22N / 5 lbf
5.4 Technical Information

00 | Page 16www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
Please make sure the Power Supply is OFF before connecting/disconnecting the Nexus Hand to and from the
prosthesis as this will avoid any unpredictable spikes in the electric current from the batteries. Turn the power
on once the hand is properly connected to the prosthesis.
Please see the image below for instructions on how to connect the Nexus Hand to your patient’s socket.
6.1 Connecting/Disconnecting the Nexus Hand
6.0 Fitting the Nexus Hand
If the ball bearings are locked out radially, the hand will not plug in.
Remove protective cap
Ensure no debris is inside
the EQD core before
connecting the hand to
the socket.

00 | Page 17www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
Connect the hand to the socket by pushing the EQD
into the wrist on the socket until you hear the two
click together.
Check the hand is properly connected by twisting
it 90° clockwise and anticlockwise and lightly pull
it away from the socket. If the hand wobbles in the
socket it isn’t connected properly.
When you turn the hand on, you will hear the start-
up beep and the E-Paper screen will display Nexus
followed by the first grip in Table A.
To disconnect the hand from the socket, rotate it and
lightly pull it until the hand disconnects.
6.0 Fitting the Nexus Hand
If the Nexus Hand is not used for a long period, protect the EQD from debris with
the cap. Do NOT use the Nexus Hand if it is visibly damaged.

00 | Page 18www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
It will then display the following:
6.0 Fitting the Nexus Hand
FW: The high-level firmware. The image shows
Version 2 followed by the date it was created.
GW: The low-level firmware. The image shows
Version 2 followed by the date it was created.
The Nexus Hand has an E-Paper screen which shows important hand information. It requires no power to
display and little power to change display, so it doesn’t drain the user’s batteries.
When you turn the hand on, the E-Paper screen will display the following:
It always shows the current grip, table and battery life. The Bluetooth icon will appear for the first 60 seconds
and will disappear unless you are connected to the App. Once you disconnect from the App, Bluetooth will
automatically turn o and the icon will disappear.
6.2 E-Paper Screen
Grip Table
Estimated Battery Life Bluetooth is enabled for 60 seconds
Current Grip

00 | Page 19www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
6.0 Fitting the Nexus Hand
6.3 System Notifications
When Auto Grip is enabled, if the hand senses an object is slipping it reapplies a small continuous force to
grasp the object. Auto Grip works in power grip, tripod grip, precision open and precision closed.
Auto Relax moves the hand to a relaxed position after a period of inactivity. A user input signal will cause the
hand to revert to its previous grip and the icon will be removed.
A short press to the dorsal button (under two seconds) puts the hand into Standby Mode where user inputs
from the electrodes have no eect on the hand. Pressing the dorsal button again will exit Standby Mode and
the icon will be removed.
The CAN bus icon is displayed whenever the hand is connected to a CAN enabled device, such as the COAPT
Gen2 system. NOTE: this icon is only displayed once Bluetooth has turned o (the two icons share the same
location on the display).
The warning icon shows that the hand has detected a fault. The screen will also display text to identify how
many individual faults are detected and automatically cycles a short description of each one.
Fault detected
Connected to CAN BUSStandby Mode is activated
Auto Relax is enabled
Auto Grip is enabled

00 | Page 20www.covvi.com | Unit 4, Quayside Business Park, Leeds, LS10 1DJ | 020 3949 9500
6.0 Fitting the Nexus Hand
When the Nexus Hand is too hot, outside of its normal operating
temperature (see section 4.0), the following warning message and
icon will appear. If this message appears, please disconnect the hand,
and allow it to cool down.
When the Nexus Hand is too humid, outside of its normal operating
humidity (see section 4.0) the following warning message and icon
will appear. If this message appears, please disconnect the hand, and
allow it to dry in a warm, dry environment.
Any function that refreshes the screen, for example a grip change, will change the message displayed but the
warning icon will remain visible.
The following notifications will appear when you
select to update the firmware in the COVVI Go
App. The update downloads from the App to the
hand and then it updates the hand.
A list of all fault codes can be found on our
website: www.covvi.com