Predicting air-balloon and water-filled infant catheter frequency responses

Craig G. Hartford*, Johan M. Van Schalkwyk, Geoffrey G. Rogers, Martin J. Turner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The frequency responses of nasogastric water-filled catheters (W-FC) and air-balloon catheters (A-BC) were determined with a sine wave generator, to test the validity of the assumption that these frequency responses fit a second-oder system. A-BC and W-FC frequency responses do not adequately fit second-order systems. Second-order fitted curve:original recorded curve (SOFC:ORC) deviations are larger in W-FC than in A-BC, and in large French Gauge-sized catheters. The sine-wave generator is best used to measure in vitro frequency responses of compliant fluid-filled catheters rather than the square-wave response technique.

Original languageEnglish
Pages (from-to)27-33
Number of pages7
JournalIEEE Engineering in Medicine and Biology Magazine
Issue number3
Publication statusPublished - May 1997
Externally publishedYes


Dive into the research topics of 'Predicting air-balloon and water-filled infant catheter frequency responses'. Together they form a unique fingerprint.

Cite this