The MKI Prototype 5th April 2020
Introducing the Automated Hand
It is paramount to obtain the maximum life out of each bag by simulating as close as possible the bags original intended operating conditions, that of a hand with fingers. Hence at the core of our mechanism is the automated hand like lever arm with three fingers.
Automation Without Large Cam Wheels
Using a compact, double cam arrangement above, we have been able to convert the reciprocating movement of a wiper motor into a precision step motion whereby the hand is moved up and down without the need for the large cams as used in the many other designs.
Simple and Fast to Maintain in the Field
Our mechanism can be dismantled and reassembled in under a minute! No tools are require to replace the motor or the main "hand" assembly.
Controlling the (I) Inhalation Period and (BPM)
With the Field Ventilator uniquely both the BPM breath per minute and inhalation (I) period is governed by the velocity of the cam. This is a significant advantage over other low budget designs which must be stopped to change a cam wheel or adjust the rates.
As the velocity of the cam with the Field Ventilator is a direct function of motor speed, the simplest way to alter both the BPM and the I phase of the ventilation cycle is to use a simple speed controller.
Controlling the (E) Exhalation Period
The essence of ventilation is a bi-phase process. There is an inhalation period called the I phase where air / oxygen flows from the ventilator to the patient and then a period where the flow is reversed where the stale air exits from the patient (exhaled) and is vented to atmosphere, the E phase.
With the Field ventilator there is a simple $10 timer circuit that senses the position of the cam and sets the E Phase without the need to change cam wheels. The trace opposite was recorded at the UK's National Physical Laboratory (NPL) during early evaluation testing of the MKI showing a near perfect 1:3 I to E ratio.
March 2021
The MKII Field Ventilator
About to enter clinical trials - the MKII Field Ventilator - highly affordable, practical, portable and easy to manufacture and maintain virtually anywhere in the world.
The MKII uses analogue and CMOS logic eliminating the dependency making the design easy approve for safety and to maintain into the distant future.
The MKII - Ambubag Automation
Ambubag Automation - Kept Simple
Push Buttons, Analogue Gauges / Dials With Back-light
Uses a Standard Ambubag
Battery Operated
Retains the MKI Single Cam & Roller Concept
Motor Driven Cam and Rollers
Squeezed by a Mechanised Hand with Fingers
Cam Driven with variable speed, well time (I:E) & compression
The MKII Brings Ambubag Automation with Control
Full Control over I:E Ratio
Control of O2 Levels
CO2 Monitor & Alarm
Tidal Volume Control
Exhaust Air Filtration
Battery Voltage Alarm
Adjustable PEEP
Patient Trigger
Automated Back-light
The MKII is Simple to Power
12V Battery Operation
Dual Battery
Battery Monitor
The MKII is Simple to Transport
Easy to Carry
Rapid Disconnection of Supplies
Robust & Stackable