Biliary lithotripsy can be enhanced with proper ultrasound probe position.

John Paul Affronti, T. Flournoy, S. Akers, J. Baillie

Research output: Contribution to journalArticle

Abstract

We have demonstrated in our in vitro system that an extracorporeal lithotripter utilizing a movable ultrasound probe can fragment gallstones more effectively when the ultrasound probe is not partially blocking shock waves. Using a pressure transducer we measured the pressures in the focal volume of a Wolf Piezolith 2300 lithotripter with the ultrasound probe fully extended and fully retracted. We also chose 12 pairs of twin gallstones, each taken from the same gallbladder. One stone from each pair was subjected to shock waves while the ultrasound probe was fully extended and the other treated while the probe was fully retracted. Shock wave pressures (which are converted to a measurable voltage output by our transducer) were clearly lower when the ultrasound probe was extended (5.45 volts; SEM = 0.10 volts) as compared to when the ultrasound scanner was retracted (6.7 volts: SEM = 0.08 volts). Significantly more shock waves were required to completely fragment stones when the ultrasound scanner was extended than when it was retracted (p = 0.01 using the nonparametric Wilcoxon's signed rank test). These results show that, in the lithotripter tested, an extended in-line ultrasound scanner can partially block shock waves. Retraction of an extendible ultrasound probe may enhance stone fragmentation when operating at the highest shock wave intensity.

Original languageEnglish (US)
Pages (from-to)141-144
Number of pages4
JournalThe Journal of stone disease
Volume4
Issue number2
StatePublished - Jan 1 1992

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Lithotripsy
Gallstones
Pressure Transducers
Pressure
Nonparametric Statistics
Gallbladder
Transducers
Ultrasonic Waves
In Vitro Techniques

Cite this

Affronti, J. P., Flournoy, T., Akers, S., & Baillie, J. (1992). Biliary lithotripsy can be enhanced with proper ultrasound probe position. The Journal of stone disease, 4(2), 141-144.

Biliary lithotripsy can be enhanced with proper ultrasound probe position. / Affronti, John Paul; Flournoy, T.; Akers, S.; Baillie, J.

In: The Journal of stone disease, Vol. 4, No. 2, 01.01.1992, p. 141-144.

Research output: Contribution to journalArticle

Affronti, JP, Flournoy, T, Akers, S & Baillie, J 1992, 'Biliary lithotripsy can be enhanced with proper ultrasound probe position.', The Journal of stone disease, vol. 4, no. 2, pp. 141-144.
Affronti JP, Flournoy T, Akers S, Baillie J. Biliary lithotripsy can be enhanced with proper ultrasound probe position. The Journal of stone disease. 1992 Jan 1;4(2):141-144.
Affronti, John Paul ; Flournoy, T. ; Akers, S. ; Baillie, J. / Biliary lithotripsy can be enhanced with proper ultrasound probe position. In: The Journal of stone disease. 1992 ; Vol. 4, No. 2. pp. 141-144.
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