ANOVED Autonomous non-invasive ventilation device

Ne işe yarar

Manual ventilation with a bag-valve mask is manual, variable, and causes fatigue, compromising the recommended volumes of 500–600 mL. We propose an autonomous ventilator with a brushless motor, high-flow blades, and a LiPo battery that guarantees precision.

İlham kaynağın

Manual bag-valve-mask ventilation (MBVM) depends on the skill of the operator, resulting in variations in tidal volume (500–600 mL), frequency (10–12 rpm), and pressure (≤ 20 cmH₂O). Studies indicate that more than 50% of people trained in MVB deliver volumes incorrectly, increasing the risk of lung damage in patients. A compact, portable, and autonomous system, requiring no external oxygen or power, would automate tidal volume delivery, reduce the physical burden on staff, allow for the monitoring of multiple patients, and enable immediate deployment in mass emergencies or resource/access-limited environments.

Nasıl Çalışıyor

The device uses an ESP32 microcontroller that runs the program on Arduino to control two brushless motors, alternating between 6 and 3 seconds breathing cycles depending on the user's selection. The microcontroller is powered by an external 10,000 mAh battery, while the motors are powered by two 2,200 mAh-11.1 V LiPo batteries, ensuring the tidal volumes and pressures required by the American Heart Association (AHA) and European Resuscitation Council (ERC) for non-invasive ventilation in respiratory arrest events. The entire device is manufactured using 3D printing, with designs in Fusion 360, turbocharger-shaped blades coupled to a compression scroll. Validation was performed on test manikins equipped with flow and pressure sensors, allowing the control software to be adjusted and the accuracy of the system to be verified. An LCD panel displays real-time ventilation parameters, battery level, two buttons for selecting the operating mode, and a on/off switch.

Tasarım süreci

The first prototype was made from waste materials from previous projects, such as 9V DC motors and blades from an ARD-370 flow meter cut with a knife and glued with silicone to a cardboard base. The second prototype was modeled in Tinkercad and sent to a 3D printing company, but the measurements were incorrect and the centrifugal blades did not provide the necessary pressure. In addition, the DC motors did not have enough power. For the third prototype, I bought a 3D printer, modeled all the parts in Fusion 360 with millimeter precision, and printed them. I looked for information on medical ventilation devices, standards, and associations to support the design and arrived at the fourth functional prototype with a more compact microcontroller, more powerful brushless DC motors, and more precise measurements with stiffer materials to prevent vibrations during operation. It also has a battery life of one hour before needing to be recharged. It is currently being tested with resuscitation manikins with integrated sensors to validate its pressure and volume delivery prior to preclinical and clinical studies for use in humans.

Nasıl bir farkı var

This device can save lives without causing harm. Similar products are very expensive, complex to manufacture, and have design flaws. This device is designed for doctors or paramedics who perform manual ventilation with a bag valve mask (VMMB), since in Mexico they can spend up to 8 hours ventilating a person, which is unacceptable. This device will be completely autonomous, giving the doctor or paramedic performing the ventilation task a break of an hour or even more. The plan is to make it public domain so that everyone has access to it and everyone can contribute to improving the system. This device is cheaper than commercial ones; so far, it has been 80% cheaper, which makes it a great candidate. There are not enough doctors, there are not enough hands to care for us, as demonstrated by the COVID pandemic, which is why this device is autonomous and viable.

Gelecek planları

Goals to be achieved: to have an autonomous tool for basic care in patients requiring non-invasive assisted ventilation validated by the American Heart Association (AHA) and the European Resuscitation Council (ERC) such as the AMBU device, to be in the public domain, to be able to help in remote areas without electricity or oxygen. The next steps are: increase autonomy to 2 hours of ventilation, develop better flow blades, reduce volume and pressure delivery variations by 90%, develop an easy-access housing for cleaning, correct motor vibrations, and reduce the price even further.

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