Document Detail

In vivo results with a new device for ultrasonic monitoring of pig skin cryosurgery: the echographic cryoprobe.
MedLine Citation:
PMID:  9699736     Owner:  NLM     Status:  MEDLINE    
One of the main difficulties encountered in cryosurgery is the uncertainty in the extent and depth of the tissue effectively treated during the freezing process. The objective of this study was to evaluate in vivo ultrasonic control of skin cryosurgery using a new echographic cryoprobe. An echographic cryoprobe, developed specifically for dermatology applications, combines a high-frequency (20 MHz) miniature ultrasonic transducer and a N2O-driven closed cryoprobe. Knowledge of the ultrasound velocity of frozen skin is a prerequisite for monitoring the iceball formation kinetics. Therefore, in a first study, we estimated the ultrasound velocity of frozen skin specimens. In a second step, the operation of the echographic cryoprobe was assessed, under in vivo conditions similar to those used in human therapeutics, on normal skin of three female "Large-White" pigs under anesthesia. The mean value of ultrasound velocity of frozen skin obtained by pooling the data from all the skin specimens included in this study was 2865 +/- 170 m per s. The average rates of growth (10(-2) mm per s) of the iceballs were found to be 12.2 +/- 1.0 (pig 1), 9.0 +/- 1.0 (pig 2), and 8.4 +/- 0.9 (pig 3). The echographic cryoprobe had a built-in high-frequency ultrasonic transducer that served two functions. It enabled in vivo real-time monitoring of depth penetration of the iceball and it gave important feedback to the operator or to the console relating to the rate of growth of the iceball. Automatic (i.e., operator-independent) detection of the echo signal from the freezing front and calculation of the depth penetration of the iceball was possible.
P Laugier; E Laplace; J L Lefaix; G Berger
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of investigative dermatology     Volume:  111     ISSN:  0022-202X     ISO Abbreviation:  J. Invest. Dermatol.     Publication Date:  1998 Aug 
Date Detail:
Created Date:  1998-08-19     Completed Date:  1998-08-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0426720     Medline TA:  J Invest Dermatol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  314-9     Citation Subset:  IM    
Laboratoire d'Imagerie Paramétrique, URA CNRS, Paris, France.
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MeSH Terms
Skin / surgery*

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

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