The VEMD is a closed-loop, thermal mass flow controller that precisely supplies inert gases and oxygen at flow rates from 0 to 20 ln/min. Its piezo technology delivers an industry-leading dynamic response and energy efficiency, all at an excellent price/performance ratio. Since no pulse-width modulation signal is required to control the flow rates, the VEMD is quiet during operation. Thanks to its compact installation dimensions, low weight and low energy consumption, it is ideal for use in mobile devices, as the first application example shows.
Patients with pulmonary hypertension and chronic respiratory arrest are not able to absorb the amount of oxygen necessary for daily life. They therefore benefit from home oxygen therapy (HOT). Using a mobile oxygen concentrator and a nasal cannula, patients can inhale oxygen at a concentration of 90%. For comparison: the oxygen concentration in the air is around 20%.
In the past, this type of treatment required regular hospitalisation. Thanks to mobile oxygen therapy, patients can now stay home and enjoy a much larger range of actions.
The VEMD is used in light and safe oxygen concentrators, where it ensures the oxygen is precisely dosed and at exactly the right time for the patient's breathing. Again, the most important criteria are quiet operation, suitability for oxygen, energy efficiency, low weight and dynamic response.
The production and filling of single and multi-chamber infusion bags requires maximum process reliability. To reliably protect the bags from degenerating, they are flooded with the inert gas nitrogen when they are being filled. Throughout this process, the flow rate must be adjustable to prevent spraying during injection. This is where the VEMD comes into play, since it reliably meets the high requirements for reproducibility.