Document Detail


In vitro evaluation of the iValve: a novel hands-free speech valve.
MedLine Citation:
PMID:  22279953     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
OBJECTIVES: We performed in vitro evaluation of a novel, disposable, automatic hands-free tracheostoma speech valve for laryngectomy patients based upon the principle of inhalation. The commercially available automatic speech valves close upon strong exhalation and open again when the pressure drops. This method makes long sentences or pauses difficult. The novel iValve is designed to allow almost natural speech, with mid-sentence pausing and whispering.
METHODS: The inhalation closing flows and exhalation opening pressures of 6 iValve prototype versions at different settings were compared with physiological values. The airflow resistance at inhalation was compared to physiological values and to commercial valve values.
RESULTS: The iValve prototypes showed flow and pressure ranges in concordance with the physiological values in the literature. The airflow resistance in the breathing mode was within the physiological airflow resistance range, yet above the values from the two commercial valves. The resistance in the speaking mode was above the physiological airflow resistance range.
CONCLUSIONS: In vitro tests show that the iValve versions can be selected and adjusted to operate within the physiological range. The airflow resistance in the breathing mode is good. In speaking mode, inhalation should, and can, be decreased. The iValve should offer the patient a more intuitively useable alternative with more dynamic speech. Its low cost allows disposability and wider use.
Authors:
Eduard B van der Houwen; Tjouwke A van Kalkeren; Johannes G M Burgerhof; Bernard F A M van der Laan; Gijsbertus J Verkerke
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Annals of otology, rhinology, and laryngology     Volume:  120     ISSN:  0003-4894     ISO Abbreviation:  Ann. Otol. Rhinol. Laryngol.     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2012-01-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0407300     Medline TA:  Ann Otol Rhinol Laryngol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  814-9     Citation Subset:  AIM; IM    
Affiliation:
Department of Biomedical Engineering, University Medical Center Groningen, University of Groningen, Groningen, athe Netherlands.
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