#856 2016 · Arthur Zang (Himore Medical) · medical devices
Arthur Zang split the heart exam in two so a village clinic could borrow a cardiologist
the problem
Rural patients needed a heart specialist; Cameroon had a few dozen, almost all in two cities.
background
Cameroon's heart patients faced a brutal arithmetic: a country of some 22 million people had a few dozen cardiologists, almost all clustered in Yaoundé and Douala, while half the population lived in rural villages hours from either city. A patient with chest pain in the bush could travel a day to see a specialist, or more likely never see one at all. The official answer was to train more cardiologists, but that pipeline takes the best part of a decade per doctor and deposits its graduates back in the same two cities.
Arthur Zang was still a student at Yaoundé Polytechnic in 2009, writing a thesis on sending heartbeats over wireless networks, when he took the problem personally — he had grown up in a village, and an uncle had died of heart disease. He consulted Samuel Kingué, a cardiologist in Yaoundé, on what an exam actually required, first loaded his software onto an off-the-shelf tablet, then decided to build the hardware himself: a touchscreen device tough enough for humidity, unpaved roads and power cuts. In December 2011 he filed a patent (OAPI No. 16213) and founded Himore Medical to produce it.
what everyone would do
The standard answer to 'no specialists here' is to make specialists here: train more cardiologists, post them to district hospitals, build clinics to house the equipment. That pipeline takes a decade per doctor, costs a fortune the health system did not have, and historically deposits its graduates back in Yaoundé and Douala. The other default is to move the patient instead — a six-hour bus ride for a fifteen-minute reading. Both answers assume the cardiologist and the patient must end up in the same room.
what they saw
A heart exam is two jobs: collecting the signal — mechanical, teachable — and reading it, which takes a decade of training. Bundling both into one person made that person's scarcity into the patient's disease.
the move
The Cardio-Pad splits a heart exam into its two separable jobs. A nurse or general practitioner in a rural clinic attaches the electrodes and runs the electrocardiogram on the tablet — the mechanical half, which takes minutes to learn. The reading travels over the mobile phone network to a cardiologist in the city, who diagnoses and sends instructions back; the whole round trip takes about 20 minutes. The device is built for its real environment — six hours of battery, sealed against humidity, rugged enough for rough roads — and was priced at roughly €2,200, far below a conventional ECG station.
why it works
Once the exam is split, only the scarce skill has to move — and data moves for almost nothing where people cannot. The mobile network Cameroon already had becomes the ambulance: a generalist becomes the hands of the exam while the specialist remains its eyes. One cardiologist in Yaoundé can now read for dozens of villages in a day instead of seeing only the patients who reach his door, so a fixed stock of specialists suddenly covers a population that was previously beyond their reach. And because the round trip fits inside twenty minutes, the reading still belongs to the patient sitting in front of the nurse, not to a file sent away.
the payoff
By 2020 the pad ran in about 100 Cameroonian hospitals and five other countries, with 9,800 remote exams read by twenty cardiologists.
where it breaks
The model needs a network to carry the reading and specialists with spare capacity at the far end — in a connectivity dead zone, or a city queue already drowning in referrals, the round trip stretches or dies. It transfers interpretation, not procedures: a patient who needs an intervention still travels, so the device extends diagnosis further than treatment. And it assumes the clinic end has someone trainable in the mechanical half; a health post with no health worker at all has nothing to split. Zang himself felt the far-end constraint — his twenty interpreting cardiologists were overwhelmed, their phones full of unread exams.
what came after
Zang was named a Rolex Awards Young Laureate in 2014 and won the Royal Academy of Engineering's Africa Prize for Engineering Innovation in 2016. Himore Medical, founded to make the device, grew to about fifteen employees and exported the pad to Comoros, Gabon, Guinea, Kenya and Nepal — one Cameroonian answer to a shortage that most health systems try to close by training, slowly, more specialists.
references
- [1]Cardiopad: Reaching the Hearts of Rural Communities in AfricaWIPO Magazine, 2014wipo.int
- [2]Africa Prize for Engineering Innovation — Arthur Zang (Cardio-Pad)Royal Academy of Engineering, 2016africaprize.raeng.org.uk
- [3]The day Bluetooth brought a cardiologist to every village in CameroonGeneva Solutions, 2020genevasolutions.news