Document Detail

Ex vivo testing of a temperature- and pressure-controlled amnio-irrigator for fetoscopic surgery.
MedLine Citation:
PMID:  11781980     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Currently, amnioinfusion fluids used in operative fetoscopy usually are preheated to body temperature. As the complexity of procedures increases, purposed designed devices should be designed that allow control of pressure and temperature during amnioinfusion or amnioexchange. In the current study, a prototype amnio-irrigator and fluid heater were evaluated. METHODS: The medical fluid heater heats fluid by conduction up to 37 degrees C. The maximum irrigation pressure and flow rates can be preset. Actual irrigation pressure (0 to 30 mm Hg) and flow rate (0 to 300 mL/min) can be read on the front panel. A series of ex vivo experiments were set up to determine the relationship between the flow rate (FR) and lumen of the instruments as well as the maximum flow rate (MFR) with and without the pressure control. Further, the relationship between FR and the irrigation pressure (IP) was determined. In an artificial pseudoamniotic sac the relationship between FR and change in temperature was measured, with and without the use of the medical fluid heater. RESULTS: When the IP was limited to 24 mm Hg, FR and pressure were correlated (r = 0.34; P <.001). The larger the functional lumen of the fetoscopic instrumentation, the higher the flow (r = 0.43; P <.001) and the lower the increase in IP (r = -0.47; P <.001). A quadratic relation between flow and temperature was observed both for preheated fluid as when using the fluid heater (r(2) = 0.71 and r(2) = 0.88; P <.001). However, at low flow rates, a thermal decrease of over 3 degrees C was observed when the fluid heater was not used. CONCLUSIONS: The current study quantifies an expected relationship between the diameter of the irrigation channel and achievable flow rates. It also shows that a medical fluid heater is needed when strict control of temperature would be desired.
Francesca Bonati; Alfredo Perales; Pavel Novak; Gerard Barki; Eduardo Gratacós; Umberto Nicolini; Jan A Deprest
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of pediatric surgery     Volume:  37     ISSN:  1531-5037     ISO Abbreviation:  J. Pediatr. Surg.     Publication Date:  2002 Jan 
Date Detail:
Created Date:  2002-01-08     Completed Date:  2002-03-29     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0052631     Medline TA:  J Pediatr Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  18-24     Citation Subset:  IM    
Copyright Information:
Copyright 2002 by W.B. Saunders Company.
Centre for Surgical Technologies, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium.
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MeSH Terms
Equipment Design
Fetoscopy / methods*
Hot Temperature
Irrigation / instrumentation*

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