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
Six engineers sat down in a room with a blank sheet of paper, a pen, and an
idea to create the world’s leading upper limb prosthetic hand.
Two years later the Nexus Hand launched - mechanical calculations checked
and rechecked; electrical circuit boards designed and tested; computer
code programmed and verified; engineering drawings drafted and reviewed;
production facility built and commissioned; final product manufactured,
tested, and approved.
We wanted to create the best robotic hand system in the world and we
believe that we have done it.
The COVVI Team

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1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
Introduction 06
What’s Inside 08
2.1 The Hand Kit 08
2.2 The Advantage Kit 10
2.3 The Advantage Kit Part Numbers 11
Technical Information 12
Environmental Conditions 14
Safety Guidelines 15
5.1 Abuse & Neglect 15
5.2 IP44 15
5.3 Harsh Chemicals/Abrasives 15
5.4 Operating a Vehicle 16
5.5 Firearms 16
5.6 Sporting Activities 16
5.7 Safety Precautions 17
At a Glance 18
The Nexus Hand 19
7.1 Turning On/O 19
7.2 Technical Detail 21
7.3 Key Features 22
Grip Patterns 23
The Nexus Thumb 25
Flex Wrist 27
Connections 28
11.1 Power Supply 28
11.2 Overview 28
11.3 System Connections 32
11.4 Component Compatibility 33
Contents

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Contents
12.0
13.0
14.0
15.0
16.0
17.0
18.0
COVVI Go 34
12.1 Target Hardware 34
12.2 Installing the COVVI Go App 34
12.3 Registration 35
12.4 Running The App 35
12.5 Hand Device Selection 35
12.6 Firmware Update 37
12.7 Setup Wizard 38
12.8 Sensor Interface Screen 38
12.9 Operating Modes 39
12.10 Thumb Mode 41
12.11 Grip Tables 42
12.12 Grip Switch Triggers 43
12.13 Common Options 44
12.14 Changes 47
12.15 Input Settings 48
12.16 Options 50
12.17 Advanced Configuration 51
12.18 Config History 52
Maintenance 53
Warranty 54
14.1 Nexus Hand 24-Month Limited Warranty 54
14.2 Nexus Hand Extended Warranty Option 55
14.3 Warranty Service and Repairs 56
14.4 Limited Liability 56
Returns 57
Disposal 57
Symbols Used 58
EC Declaration of Conformity 59

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1.0 Introduction
Our company name, COVVI, is a portmanteau of the Latin ‘Coperer’ and ‘Vita’, translating as
‘working together’ and ‘life’. COVVI was conceived to change many lives by working together
- within our team and stakeholders, with clinicians worldwide, and with our users.
We entered the prosthetics industry in 2017. Commitment and focus have got us to where we
are today. After years of hard work, drive, and passion, we are proud to announce Nexus, the
new multi-articulated hand by COVVI.
Both names were formulated to reflect our single driving intention to change multiple lives
together forever through harnessing endless connections to make anything possible. With
our names came our ‘delta’ logo, which also has meaningful origins as a symbol of change
and doing things dierently.
Partners in Prosthetics

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First and foremost, we are so pleased to have been picked by you and your patient as the most
appropriate prosthetic hand that will fit their needs.
Our team is experienced in the field of prosthetics and therefore understands the daily challenges
of prosthetic use and have worked hard to overcome these issues in the design of the Nexus
Hand. Function and robustness have been our two primary goals. We also appreciate that the
appearance of a prosthetic hand is very important for users. We designed the Nexus Hand
based on measured data collated from human hands to give it a natural form with novel colours
and materials to create a concept that users will be proud to wear.
The Nexus Hand was designed to withstand the necessities of daily activities; however, it should
not be subject to excessive force. Please refer to Section 5 (Pages 14-16) for more information
on our safety guidelines. As seen in Section 11.3 (Page 32), please note that the Nexus Hand
is recommended with COVVI products.
The Nexus Hand should only be fitted
by a Certified Prosthetist.
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). The Nexus Glove can be removed, but no further disassembly can be done.
All disassembly and/or repairs below this level can only be conducted by certified
technicians with training from COVVI. Any disassembly performed by unauthorised
personnel will not be covered under warranty. Any disassembly performed by
unauthorised personnel will not be covered under warranty.
CAUTION
PRECAUTIONS FOR HANDLING
ELECTROSTATIC SENSITIVE DEVICES
1.0 Introduction

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2.0 What’s Inside
2.1 The Hand Kit
Nexus Hand
5-Piece Foam
Packaging
To remove the Nexus Hand from its packaging, remove the end piece of foam by the fingertips
first and then slide the rest of the foam pieces up which will allow you to lift the hand out. You
can then remove the foam o the fingers and the EQD wrist.

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2.0 What’s Inside
2.2 The Hand Kit Part Numbers
Example Part Numbers: CV1LSQCLCA19####
CV1 |L | S |Q |CL |CA |19 |####
19 2019
20 2020
19 Year
## 4 Digit Value
#### Serial
Number
S
SSmall
MMedium
LLarge
Size
QQEQD Wrist
CL CL Clear
BL Black
Glove
Colour
CA
WH White
CA Carbon Black
RG Rose Gold
TG Titan Grey
Cover
Colour
LLLeft Hand
RRight Hand
Hand
Type
CV1 CV1

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Lamination Ring
Coupling Piece
COVPS-1600
Power Supply
Electrodes
COVSWC
Wall Charger
COVPS-1600
USB-C Charge Point
Nexus Hand
2.0 What’s Inside
2.3 The Advantage Kit

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2.0 What’s Inside
2.4 The Advantage Kit Part Numbers
Example Part Numbers: AK140E316
AK1 |40 | E |3 |16
X1000mm
6600mm
3300mm
1100mm
3Cable
16 COV-1600
16 Battery
UCEL-60
ECEL-50
E
Electrode
Filter
AK1 AK1
40 40mm
45 45mm
50 50mm
Wrist
Size
40

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3.0 Technical Information
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
C
G
A
E
H
F
D X

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Maximum hand load limit with
weight pushing down
198 lbs. / 90kg
Avoid pressure on thumb
3.0 Technical Information
Nexus Hand Voltage 7 to 8.4V
Maximum Current Consumption 5A
Device Weight 1 ¼ lbs. / 570 g
Maximum Hand Load Limit (A) 198 lbs. / 90 kg across knuckle
Maximum Finger Load Limit 35 lbs. / 16 kg
Full Open to Full Close 0.7 seconds to achieve grip
Tripod Grip 0.4 seconds to achieve grip
Tripod Grip Force Strength 25N / 5.62 lbf

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Maximum Temperature 104°F/40°C
Minimum Temperature -4°F/-20°C
Humidity Maximum 80%, non-condensing
Pressure 101.3 kPa
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

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5.1 Abuse & Neglect
We designed the Nexus Hand to be robust, but it still cannot withstand intentional abuse. The
Nexus Hand cannot sustain excessive impacts or excessive water damage.
5.2 IP44
The Nexus Hand has been tested and certified with IP44 rating, which classifies the degree of
protection that is provided against solids and water.
The Nexus Hand is protected against solid objects over 1 mm in diameter and is also protected
against sprays or splashes from all directions.
5.3 Harsh Chemicals/Abrasives
The Nexus Hand is made up of a variety of materials which may be vulnerable to damage
by various chemicals, such as solvents, acids, alkalis, corrosive substances, detergents and
similar chemicals.
Please avoid exposing your Nexus Hand to any harsh chemicals that may cause damage. If
and when the user chooses to clean their Nexus Hand, mild soap and water must be used .
Abrasive cleaners and cleaning cloths will scratch the covers.
5.0 Safety Guidelines

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5.4 Operating a Vehicle
Although the Nexus Hand can be used for many day-to-day activities, please ensure your
patient checks with their local regulations regarding the operation of a motorised vehicle with
their Nexus Hand.
Please ensure your patient has notified their insurance provider and consult with your patient
before they decide to operate a vehicle. If your patient should choose to operate a vehicle, we
recommend that their 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. shall not be
liable under any circumstances.
5.5 Firearms
The Nexus Hand should not be used to operate a firearm.
5.6 Sporting Activities
The Nexus Hand is not suitable to be worn whilst undertaking extreme sports. These include,
but are not limited to: base jumping, sky diving, mountain biking, motocross, rock climbing,
abseiling, bouldering and powerlifting. 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.
5.0 Safety Guidelines

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• COVVI has the right to void the warranty of all products that have any type of modifications
or damage caused by any unauthorised or untrained personnel.
• Individuals who are exposed to hazardous environments that contain flammable liquid or
gas should NOT operate the Nexus Hand.
• 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. Power ON the Power Supply once the Nexus Hand is properly
connected to the prosthesis.
• Do NOT expose the Nexus Hand to an open flame or submerge in water.
• Do NOT attempt to use the Nexus Hand while the batteries are charging. When the batteries
are charging, the power automatically will automatically turn o. If for any reason the power
does not turn o while charging, using the Nexus Hand can be potentially unsafe.
• Do NOT use the Nexus Hand without the integrated glove, as this could result in increased
electromagnetic emissions or decreased electromagnetic immunity of the Nexus Hand and
result in improper operation.
• Do NOT use the Nexus Hand if the glove is punctured.
• Do NOT use the Nexus Hand if a failure occurs, as it could cause harm 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 patient should stop using the Nexus
Hand immediately and contact COVVI Customer Services.
5.7 Safety Precautions
Please read the following precautions prior to using the Nexus Hand.
5.0 Safety Guidelines

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6.0 At A Glance
Flexible Glove
Electric Quick-Disconnect
Palm Grip Surface
E-Paper Screen
Rigid Covers
Mode Button
Wrist Flexion Button

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Turning the Nexus Hand on and o is as simple as connecting it to the arm socket via the electric
quick-disconnect. Please see the diagram on the next page for instructions on how to connect
the Nexus Hand to the patient’s socket.
To activate sleep mode, push the ‘Mode’ button for two seconds.
To deactivate sleep mode, push the same ‘Mode’ button again for two seconds.
7.1 Turning On/O
7.0 The Nexus Hand

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Remove protective cap
Ensure no debris is inside the
core of the Nexus Hand before
connecting it to the arm socket.
Connect the Nexus Hand to the socket by pushing the
connector into its receiving end on the socket until an
audible click is heard. Test the connection by twisting
the Nexus Hand 90° clockwise and 90° anticlockwise,
then give it a light pull in the opposite direction.
To disconnect the Nexus Hand from the socket,
please rotate the Nexus Hand within the socket
until the connection becomes loose. This works
either clockwise or anti-clockwise.
7.0 The Nexus Hand
If the Nexus Hand isn’t used for a long period, protect the EQD from debris with
the cap. DO NOT use the Nexus Hand if it is visibly damaged.
If ball bearings are locked out radially,
the Nexus Hand will not plug in.