Zive ECG
Holter monitor
Wearable ECG signal recording and transmitting device
Overview
Wearable ECG monitoring device designed for continuous 7-day heart signal recording under real-world usage conditions.
My Role:
Mechanical enclosure and internal architecture design
PCB, battery, charging, and signal component integration
Charging station and silicone protective sleeve development
Manufacturing-ready tolerances and assembly definition
Mechanical testing and iterative refinement
Key result:
7-day battery
Mass production
CE medically certified
Design constrains
Compact and comfortable form factor with large battery capacity
Long-term skin contact
Sweat and splash resistance
Reliable ECG signal acquisition
Foolproof, user-friendly charging station
Compliance with CE medical requirements
device Breakdown
Engineering chalanges
Compact size with larger battery capacity
First basic shape enclosure designed for general size, geometry and electronic component positioning reference.
Initial device iterations were done with double CR2032 batteries.
Button cells capacity were insufficient for required operating time and large amount of space used by battery fixture geometry and sealed lid.
It was decided to switch to rechargeable battery pack with charging station.
Custom press-fit electrode inserts
For ECG signal monitoring device is attached to electrode belt through button-clips
To achieve strong attachment and reliable electrical signal reception several electrode insert iterations were tested.
For first prototype simple plastic screw-in fixture method were tested. Tests showed that reliable assembly was too difficult which cause variations in alignment and contact with PCB were inconstant.
For later iterations it was decided to press-fit electrodes to enclosure body. This approach allowed to achieve desired positioning accuracy and consistent signal.
