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8 March, 2018 - 10:33 By Kate Sweeney

Cambridge device to counter fatal blood clots in surgery

Cambridge UK medical technology innovator Team Consulting has created what it believes is a game-changing spray device to prevent potentially fatal blood clots during surgery.

Convesaid is a haemostat spray device that eliminates the risk of air embolism when delivering powder haemostats during surgery.  

Stopping bleeds quickly and efficiently during surgery saves lives and money. A recent study from the British Medical Council found that 30 per cent of speciality inpatient surgeries involved a bleed during the procedure which increased the length of hospital stay.

Haemostat powders are a convenient way to stop bleeding, they can be quickly sprayed onto the location of the bleed using an air spray device. However air sprays carry a risk of squirting air into a vein and causing a lethal clot.

Team set about developing a powder sprayer which could never cause embolism. Convesaid’s ingenious airflow design uses the Coanda principle – the tendency of an airflow to follow an adjacent curved surface - to ensure that only the haemostat powder exits the device.

No air leaves the device so the sprayer is intrinsically safe. A battery-powered pump inside Convesaid creates a stream of air which picks up the haemostat powder particles and blows them out of the end of the device. The air, however, is funnelled round and back to the pump so no air ever leaves the device. Team estimates the device would cost just $15 to manufacture.

Dr Ben Wicks – head of MedTech at Team, said: “We’ve taken Convesaid from an initial concept all the way through to a fully functional proof-of-principle device. 

“Following initial design concepts and math modelling of the airflow we created the first prototype. It functioned really well but initial feedback suggested it was too large, so we set about creating a smaller handheld device which was cheap enough to be disposable.

“The new design is compact, featuring a redesigned layout, as well as a lock-out which prevents the trigger from moving until the device is switched on. Convesaid  gives surgeons the ability to stop a variety of bleeds in a rapid, accurate and safe way.

“It takes no time to set-up and is unencumbered by any air lines. Convesaid will give manufacturers the ability to deliver haemostats more effectively, more conveniently and, above all, more safely than ever before.”

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