Especially in settings where personal protective equipment, or PPE, is in short supply, intubation — inserting a breathing tube down a patient’s throat — poses a major risk of SARS-CoV-2 exposure for doctors and nurses as viral particles are released into the air.
The IBU is designed to suck contaminated air out of the box with a vacuum and trap infectious particles in a filter before they seep into the room.
Simulating a COVID-19 patient, the researchers placed a mannequin inside the IBU as well as in a commercially available intubation box. Near its mouth, they piped in an oil-based aerosol which formed tiny droplets in the air, similar in size to the SARS-CoV-2 particles in breath that spread COVID-19.
The IBU trapped more than 99.99% of the simulated virus-sized aerosols and prevented them from escaping into the environment. In contrast, outside of the passive intubation box, maximum aerosol concentrations were observed to be more than three times higher than inside the box.
“Having a form of protection that doesn’t work is more dangerous than not having anything, because it could create a false sense of security,” said study co-lead author David Turer, M.D., M.S., a plastic surgeon who recently completed his residency at UPMC.
Several months ago, Turer and colleagues submitted an EUA application for the IBU and are preparing to manufacture the devices for distribution.
“It intentionally incorporates parts from outside the medical world,” said Turer, who now is at the University of Texas Southwestern Medical Center
. “So, unlike other forms of PPE, demand is unlikely to outstrip supply during COVID-19 surge periods.”
Besides protecting providers during intubation, the IBU also can provide negative pressure isolation of awake COVID-19 patients, supplying an alternative to scarce negative pressure hospital isolation rooms, as well as helping isolate patients on military vessels.
“The ability to isolate COVID-19 patients at the bedside is key to stopping viral spread in medical facilities and onboard military ships and aircraft,” said study co-lead author Cameron Good, Ph.D., a research scientist at the CCDC-ARL.
Once the EUA is granted, hospitals and military units will be able to use the IBU to protect health care workers caring for COVID-19 patients.
Additional authors on the study include Benjamin Schilling, M.S., and Heng Ban, Ph.D., of the University of Pittsburgh
; Robert Turer, M.D., M.S.E., of Vanderbilt University Medical Center
; Nicholas Karlowsky, of Filtech
; Lucas Dvoracek, M.D., of UPMC; and Jason Chang, M.D., and J. Peter Rubin, M.D., of UPMC and Pitt.
CREDIT ALL: UPMC
CAPTION: Passive Intubation Box: Simulated virus-laden aerosol pours out the opening of the box, placing health care workers at risk.
CAPTION: Individual Biocontainment Unit: A vacuum and filtration system pulls aerosols away from the provider and traps contaminants.
TITLE: David Turer, M.D., M.S., Explains How his IBU Works
CAPTION: Unlike passive intubation boxes, the IBU protects healt care workers against aerosolized virus.
/Public Release. This material comes from the originating organization and may be of a point-in-time nature, edited for clarity, style and length. View in full here