Detection of mechanical changes to prosthetic heart valves by spectral analysis of valve closing sounds

Karen J. Reynolds, Richard O. Stephen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This study investigates the possibility of using spectral analysis of the closing sounds of a prosthetic heart valve to indicate minor changes to its mechanical state. Sounds are recorded in vitro in a large effectively anechoic tank of water, and the elastically mounted valve is actuated pneumatically within the water. This provides a noise-free environment for recordings. Analysis of the valve sounds is by spectral averaging and digital filtering, with each individual valve used to create its own filter. Results show that it is possible using this technique to detect reliably changes in the mechanical state of a valve, such as the addition of a small mass to the structure of the valve.

Original languageEnglish
Pages (from-to)60-68
Number of pages9
JournalJournal of the Acoustical Society of America
Volume98
Issue number1
DOIs
Publication statusPublished - 1 Jan 1995
Externally publishedYes

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