Mechanical model for simulating the conditioning of air in the respiratory tract.
OBJECTIVE
To create a mechanical model that could be regulated to simulate the conditioning of inspired and expired air with the same normal values of temperature, pressure, and relative humidity as those of the respiratory system of a healthy young man on mechanical ventilation.


METHODS
Using several types of materials, a mechanical device was built and regulated using normal values of vital capacity, tidal volume, maximal inspiratory pressure, positive end-expiratory pressure, and gas temperature in the system. The device was submitted to mechanical ventilation for a period of 29.8 min. The changes in the temperature of the air circulating in the system were recorded every two seconds.


RESULTS
The statistical analysis of the data collected revealed that the device was approximately as efficient in the conditioning of air as is the respiratory system of a human being.


CONCLUSIONS
By the study endpoint, we had developed a mechanical device capable of simulating the conditioning of air in the respiratory tract. The device mimics the conditions of temperature, pressure, and relative humidity seen in the respiratory system of healthy individuals.
Bergonse Neto
Nelson
N
Pontifícia Universidade Católica do Paraná, Curitiba, PR, Brasil. bergonsent@terra.com.br
Von Bahten
Luiz Carlos
LC
Moura
Luís Mauro
LM
Coelho
Marlos de Souza
Mde S
Stori Junior
Wilson de Souza
Wde S
Bergonse
Gilberto da Fontoura Rey
Gda F
D000328:Adult; D000388:Air; D000399:Air Pressure; D006801:Humans; D006813:Humidity; D008297:Male; D008953:Models, Anatomic; D012121:Respiration, Artificial / Q000295:instrumentation* / Q000592:standards; D012137:Respiratory System; D013696:Temperature; D014109:Total Lung Capacity; D012122:Ventilators, Mechanical