Document Detail

Miniature acoustic guidance system for endotracheal tubes.
MedLine Citation:
PMID:  12046704     Owner:  NLM     Status:  MEDLINE    
Ensuring that the distal end of an endotracheal tube (ETT) is properly located within the trachea, and that the tube is not obstructed by mucus deposition, is a major clinical concern in patients that require mechanical ventilation. A novel acoustic system was developed to allow for the continuous monitoring of ETT position and patency. A miniature sound source and two sensing microphones are placed in-line between the ventilator hose and the proximal end of the ETT. Reflections of an acoustic pulse emitted into the ETT lumen and the airways are digitally analyzed to estimate the location and degree of lumen obstruction, as well as the position of the distal end of the tube in the airway. The system was evaluated through in vitro studies and in a rabbit model. The system noninvasively estimated tube position in vivo to within roughly 4.5 mm, and differentiated between proper tracheal, and erroneous bronchial or esophageal intubation in all cases. In addition, the system estimated the area and location of lumen obstructions in vitro to within 14% and 3.5 mm, respectively. These findings indicate that this miniature technology could improve the quality of care provided to the ventilated adult and infant.
Eduardo J Juan; Jeffrey P Mansfield; George R Wodicka
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  49     ISSN:  0018-9294     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  2002 Jun 
Date Detail:
Created Date:  2002-06-05     Completed Date:  2002-07-19     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  584-96     Citation Subset:  IM    
Department of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.
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MeSH Terms
Acoustics / instrumentation
Airway Obstruction / diagnosis,  physiopathology
Auscultation / methods*
Computer Simulation
Equipment Design
Feasibility Studies
Infant, Newborn
Intubation, Intratracheal / instrumentation*,  methods*
Models, Biological*
Monitoring, Physiologic / methods
Reproducibility of Results
Sensitivity and Specificity

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

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