The cVent19 is an emergency use ventilator made from 3d-printable parts without any special materials or electronic components and a CPAP machine.
In the cVent a low frequency vortical fluidic oscillator alternates whether or not CPAP pressure is transmitted to the patient.† During inhalation CPAP pressure is sent to the patient.† During exhalation PEEP is provided from a water depth PEEP valve.
Below is a block diagram of how the cVent19 works::
The heart of the cVent19 are the following 3d-printable parts:
1. Vortical Inertial Fluidic Oscillator which generates an intermittent leak that causes the bi-level CPAP to sense that the patient has initiated a breath which in-turn causes the bi-level CPAP to switch to inspiratory pressure (IPAP or PPlateau).† After a defined inspiratory time the bi-level CPAP returns to its lower expiratory pressure (EPAP or PEEP).
2. Water depth based PEEP Valve with Filter
Vent19ís 3d-printable emergency ventilator designs are under development and are not presently approved by the FDA.† These devices should not be used for patient care until they receive approval.† FDA approved ventilations should only be used under medical supervision. Emergency ventilators should only be used when a standard ventilator is not available and the supervising physician believes it may save a patientís life.† These designs are being developed for and should only be used in the setting of the coronavirus pandemic of 2020, COVID-19.† Use of unapproved ventilator designs may cause death.† Use should only be in an emergency when the supervising physician understands the deviceís limitations and has advised the patient or their family of its limitations and the risk of death.