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SierrOS - Cardiopulmonary Resuscitation Device

In US, 790.000 people have a heart attack every year. SierrOS is a self-service device which does a resuscitation while awaiting rescue.

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We are four classmates and friends from Lyon in France. For our last year in high school we needed to create a project in Engineering Sciences. We decided to design a heart massage system which responds to a real need. Actually today 790.000 people have a heart attack each year in the US. And they are pretty low chances of survival, around 6% for those occurring outside of a hospital. In addition rescue usually takes around 15 minutes to come and most people do not follow first aid gestures or do it wrongly.
It is why our project, named SierrOS, may be a solution to save lives in the future if it is deployed in our daily.
SierrOs is an automated and portable cardiopulmonary resuscitation (CPR) device which can be used my everybody, even if they are not trained at.
Our project is divided in 4 main parts: the massage, the air insufflator, the power supply and electronics.
SierrOs has won the second price of a regional contest and is looking to participate to the nationals in may.

Firstly about the massage device. We needed to find a solution to create a system which could do a heart massage. After checking at systems such as cylinders, rack and pinion, we have chose to use a crank rod linked with a DC motor and a reduction gear. Our researches on the characteristics gave us each steps of the movement. The massage should be at a rythme of 100 compressions per minute and the piston should give at least 600N on the chest with penetration of 5,5cm. We the help of simulations on SolidWorks Méca3D we have found the characteristics of our motor. We actually have a 400W dc motors 24-48V, 6 000RPM-12 000RPM, with a reduction gear of 1:100. Here our motor would turn under 40V for a rotation speed of 1000RPM and a couple of 29,5Nm and a rotation speed of 100rpm at the exit of the reduction gear. We designed the whole system with different materials to limit friction and manufactured it in our school.

The insufflator system has been design to be able to insufflate de perfect amount of oxygen in the victim's lungs. We chose to compress a special medical balloon used in hospitals with a press and a rack and pinion. This device is connected to the massage with a special rythme directed by the microcontrolor. Actually the whole system should respect this special pace of 30 compressions-2 insufflations. To manufacture the rack you used laser cutting.

In terms of electronics we took the decision of designing our own card and manufacturing it in China to limit use of wires everywhere. Our microcontrolor is a ESP32, it includes many functions such as: possibility of communication with rescue, communicate with a screen to explain users where to place SierrOs on the victim, drawing a Electro-cardiodiagram with electrodes, measurements of the quantity of oxygen in blood...

SierrOs is power supplied with 3 batteries LiPo which give us an autonomy of an hour.

  • 3 × LiPo 1500mAh 11,1V Batteries
  • 1 × 400W DC Motor, 24V-48V, 6 000rpm-12 000rpm Motor
  • 1 × Reduction gear 1:100 Reduction Gear
  • 3 × AD8232 + 3 heart electrodes Rescue material
  • 1 × ESP32 Microcontrolor

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  • Where is SierrOs going on ?

    Mattis EYNARD4 days ago 0 comments

    04/04: SierrOs was presented at the Lyon regional engineering contest. It has done the 2nd price and has been qualified for the French national finals in Paris in May. We keep you up to date on the 28th of May.

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t0mm4rx wrote 3 days ago point

This guys are awesome !

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