The Microlife CRADLE VSA

The Microlife CRADLE VSA can accurately measure blood pressure and heart rate and uses these values to calculate whether the women is at risk of developing shock.


It took 6 years to produce an algorithm that is accurate in non-pregnant adults. Further modifications and rigorous testing ensured the device is accurate in pregnancy including women with high blood pressure, and uniquely women with low blood pressure in pregnancy.

Robust and Low Cost

The Microlife CRADLE VSA has been developed specifically to meet the World Health Organisation criteria for use in a low-resource setting. It is low cost for non-profit usage, has low power requirements and can be charged using a standard mobile phone charger. It is also robust, this means it stays extremely accurate even at extremes of temperature and humidity, after being dropped from a height of 20 metres and after being used more than 20,000 times at high pressures. The device takes 4 hours to fully charge will take 200 readings before needing to be recharged. The lithium battery is fixed into the device and the power requirements are:  350 mAh, 3.7 V.

CVSA are currently available for collection in Central London at cost price £40 each. If purchased for non-profits application or donation, please name that purpose and request 25% discount. Same if CradleTrial can chose non profit recipient or country and will confirm to donor. To order for dispatch to any existing global postal address please request quote:

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The Microlife CRADLE VSA incorporates a novel early warning system. The vital sign results are shown as a traffic light display, so that even those who do not recognise abnormal results are alerted to the need for action. Severe bleeding, severe infection and blood pressure disorders are the most common cause of deaths in pregnancy. All of them are directly correlated with abnormal vital signs. Therefore the warning lights are triggered by high blood pressure as well as low blood pressure and shock.

The blood pressure thresholds informing the traffic light early-warning-system.


The Microlife CRADLE VSA is the least expensive and most accurate blood pressure device available to use in pregnancy. For this reason it has been has been recognised as one of the top thirty high impact innovations in global health in a recent PATH-led award to help accelerate progress towards the United Nations Sustainable Development Goals. It has also been adopted into the medical archives of the Science Museum, London. If you would like to know more about purchasing devices please see the contacts page.


A simple training package has been designed to accompany introduction of the CRADLE VSA device consisting of a presentation, interactive breakout sessions with scenarios and short animated films (, made in collaboration with Medical Aid Films ( which demonstrate how to use and maintain the device, and provide a basic overview of
pre-eclampsia and shock in relation to the early warning system traffic light alerts.