The Device

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 six 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 at approximately $20 per device, it 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 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 Microlife CRADLE VSA is the cheapest 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.

How to Use The Device

Microlife CRADLE Vital Sign Alert Tutorial – for trained health care providers


Microlife CRADLE Vital Sign Alert Tutorial – for health care providers with non traditional training



Female doctor

VSA cradle device