Potentially infected aerosol is nowadays subject matter of many international studies and technical treatises. All over the world doctors, dentists and health professionals are learning how to live together with the Coronavirus emergency. This means to rearrange their activities.
Nontheless, contamination risk due to potentially infected aerosol remains. Or rather, it makes a comeback with this pandemic, since the exposition to microbes of those operating close to patients is a well-known problem since the ’60s with Hepatitis B before and HIV later. As a consequence, extraction of aerosol in the area between patient and operator will be good practice from now on for all medical practices, so to drastically reduce dispersal of pathogens before they spread in the environment leaving no other solution than flow air in the room.
Technically, it will be necessary to equip practises with proper devices to aspire aerosol particles straight from the source. To do so, the only solution is a professional suction system with self-supporting suction arm and hood, located so to intercept particles before they reach operator’s respiratory tract (already protected by personal protective equipment) or other susceptible parts. Suction hood, when correctly designed and with a minimun capacity of 400mc/h, creates a captation sphere proportional to its diametre. Our engineers estimate a minimum diametre of 350mm to work at 30cm far from the hood.
Some mobile aerosol suction systems are already available on the market today, as VS400M by Secureair®.
Despite its compactness, mobile extractors requires space often not availble in practices and operating rooms.
Aerosol suction system: centralized solutions
In case of facilities and clinic with more practices to equip, the ideal solution is the centralized aerosol suction plant. Among its advantages:
- no onbstructions on the floor in practices
- suction arms wall- or ceiling-mounted with adjustable lenght
- suction arm foldable when not in use
- sole extraction unit outside operational areas
An aerosol suction system needs to be designed and sized in the same way as an industrial extraction plant. They have in common the importance of hoods’ capture performance, but the system is customized according to:
- number of stations of work to serve at the same time
- availablity and kind of air gaps for connecting pipes
- height of the rooms, kind of masonry and ceilings
Suction system’s components
As any other extraction system, even a medical suction plant needs to be designed following precise engineering parametres to be functional over time. More than that, it needs technical items specifically designed, in particular when it comes to suction arms and aspiration unit.
More than any other part of the system, aerosol suction arms have to be specifically designed for medical application, since they are parts handled every day and they need to be sanitized all the time. Pipes and juctions must be of aluminium or plastic materials suitable for sanification. As a consequence, metal parts and springs on sight must be avoided. Lastly, the ideal internal diametre is not less than 100mm, so to ease aspiration and keep the noise down to the minumum.
For Secureair®’s plants, our engineers only use top-quality ducts in various cutting lenght and combinable with different hoods.
Suction arms are connected to the aspiration unit through pipes. When it comes to medical suction system, units are designed for the maximum of performance with the minimun of size, so to suitable for installation on balconies, terraces and in utility rooms.
Plant’s capacity and pressure are sized in three VS400M models, to aspire aerosol in efficiency even when the system extracts contemporary from 2, 4, up to 8 arms.
A special 4-stages filtration system has been developed by Secureair®, specifically for problems caused by Covid-19:
stage 1 – pre-chamber of settling by coalescence
stage 2 – filter separating fluids with 100% relative humity
stage 3 – ePM10 80% according to ISO 16890
stage 4 – HEPA H14 filter according to EN 1822:2019
Risk due to aerosol and possible solutions to it have been treated by Secureair® technicians in this and other articles. Read them to know techniques to extract and abate Coronavirus particles thanks to specific filters.
Our advisors are avaible for more information or to develop ad hoc project, contact us!