Product Overview: Small Details Making Up COVVI

Leading Technology

The COVVI team are highly experienced in the prosthetics field and have collaborated throughout development, to put into practice the lessons learned from preceding designs. The Nexus Hand is enabled by an innovative actuator design with market-leading power density and comes in three different sizes, all of which operate with next level grip force (70N) and speed (0.4s Tripod grip) capabilities.

It also has a three-way digit control system, in addition to a built-in E-Paper screen that can display notifications, troubleshooting issues and training information during set-up.

Nexus Hand – Small Size	17.15 cm / 6¾ inches
Nexus Hand – Medium Size	18.42 cm / 7¼ inches
Nexus Hand – Large Size	19.69 cm / 7¾ inches
Nexus Hand Voltage	7 to 8.4V
Maximum Current Consumption	5A
Device Weight	570 g / 1¼ lbs.
Maximum Hand Load Limit (A)	90 kg / 198 lbs. over the knuckles
Maximum Finger Load Limit	16 kg / 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

Thumb Design

COVVI’s thumb design is fully customizable, but by default includes a passive flexing capability (also applies to all fingers), operating via thumb force and position sensors and an intuitive rocker switch e.g. Tap the thumb right to move it to the right.

COVVI has built a product with an innovative and highly robust thumb. Using a twin motor design, effective thumb control is achieved by only taking a rapid 0.3 seconds for both full rotation and full-flex travel.

There are two operational modes:

• Latched: prevalent in prosthetics already, using opposed and unopposed grips – this allows easier access to multiple grips.

• Dynamic: simultaneous thumb flex and rotate (can use an open/open or co-contraction to cycle grip patterns) – allows for a wider variety of grips without external input.

Hand Covers

The Nexus Hand is protected by a water-resistant neoprene glove with color and texture customizable rigid reinforcing panels.

All finger and thumb tips are touch-screen compatible, and all exterior components are easy clean and easy to replace.

The E-Paper screen on the Nexus Hand needs no power in order to function and can show information on grip modes to aid training, and error messages to diagnose any potential faults.

Left to Right:
White, Carbon Grey, Rose Gold, Titan Grey

E-Paper Screen

Fully customizable and enables direct communication between the user device and the clinician – very useful for mode identification, training and fault diagnosis.

E-Paper screens are beneficial for their low power consumption, and improved readability (due to their ability to display high-resolution images and text without glare, allowing COVVI users to view device information easily and clearly.)

Flex Wrist

The flex wrist is already integrated into the Nexus Hand as standard, featuring a passive sprung flex and push/push locking mechanism (+/-30°; great for bilateral users!), making the Nexus Hand the shortest flex-wrist-inclusive, multi-articulated hand available.

The wrist also has a latched lock option that can be activated to secure the hand into various positions.

Engineering Behind Nexus

Our hand size range is suitable for all adults and most adolescents. At COVVI, we started with the small Nexus Hand and built bigger. This ensured we did not compromise on any functionality across the size range where in the past engineers had always started big and tried to shrink their design down, which was challenging to do without losing some of the hand’s function.

We are extremely proud of our compact design and cannot wait to see you bring it to life!

Please Note: This infographic below should only be used as a guide. Please take measurements of hands from clinical data. TASKA is owned by 5TH ELEMENT LIMITED, Bebionic is owned by Otto Bock HealthCare GmbH, i-Limb is owned by Touch Bionics Limited

Electrodes

The COVVI electrodes are compatible with most standard electrode cabling and operate at a 30-250Hz frequency band (highly sensitive at low levels).

Really easy to fit, our ‘T-shape’ construction drops through a hole in the socket wall and is locked in place with a spring-loaded clip. The flexible upper housing conforms well to the inside surface of socket walls.

Our electrodes also use bio-compatible titanium contacts, ensuring a comfortable, skin-friendly and flexible upper surface, in addition to a notch filter to reduce interference.

Power Supply

Our product features an extremely light and highly flexible battery solution that will follow the contours of the limb without bending the cell. It has a USB-C charge point, which is great for charging on the go, and is compatible with all 7.4v EQD hand systems.

Our arm connectors are military-grade and utilize simple latching features. The power supply is compact and robust with a rubberized design that communicates with the built-in E-Paper screen, displaying battery life among other information.

The power density is double that of competing systems: 7.4v 1600mAh, 2xCELLS (3.9in x 1.7in x 0.1in).

Clinician Demonstration Unit

Our clinician demonstration unit (CDU) has been developed to assist in the programming, and demonstration, of the Nexus Hand for individual users with ease. Key features of the CDU include USB-C charging, twin electrode inputs, an informative OLED screen that conveniently displays accurate battery levels and proportional control (available from push buttons in addition to the accompanying COVVI Go app.)

However, the COVVI CDU isn’t limited to excellence in design or use of premium materials to construct it but is complete through the implementation of the intuitive features; these enable communication with user devices, as well as between clinicians and a local technical support team using built-in diagnostics software.