Document Detail

Humidity control tool for neonatal incubator.
MedLine Citation:
PMID:  9684469     Owner:  NLM     Status:  MEDLINE    
In the first days of life, the daily evaporative loss from premature neonates can reach up to 20% of body mass. Such loss can be reduced by increasing the air humidity inside the incubator. Neither passive humidification nor open loop systems allow high humidity rates to be maintained or easily controlled: at 34 degrees C, the maximum levels vary with the system from 40% to 77% of relative humidity. The skin evaporative exchanges between the neonate and the environment are directly proportional to the water vapour partial pressure difference between the neonate's skin and the air. An active closed loop system has been designed, which permits reliable and accurate control of humidity according to the water vapour partial pressure set, between 1 and 6 kPa, in an air temperature range of 28-39 degrees C. It is characterised by variations of about 0.05 kPa around the set value and a maximum humidification speed of 0.25 kPa min-1. The algorithm is based on optimal control and the dynamic programming principles. Test results place this active system above usual systems for its power, precision and adaptability. It is an exploitable tool in fundamental and clinical research, to precisely study the humidity effects on neonatal comfort and thermo-regulation evolution.
M Abdiche; G Farges; S Delanaud; V Bach; P Villon; J P Libert
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medical & biological engineering & computing     Volume:  36     ISSN:  0140-0118     ISO Abbreviation:  Med Biol Eng Comput     Publication Date:  1998 Mar 
Date Detail:
Created Date:  1998-08-13     Completed Date:  1998-08-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7704869     Medline TA:  Med Biol Eng Comput     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  241-5     Citation Subset:  IM    
Service Scientifiques Communs SE-UTC, Compiègne, France.
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MeSH Terms
Automatic Data Processing
Incubators, Infant*
Infant, Newborn

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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