The problem of coupling in dry-head lithotripsy

Yuri A. Pishchalnikov, James A. McAteer, Joshua S. Neucks, Irina V. Pishchalnikova, James Williams

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Recent in vitro studies have shown that air pockets can get trapped at the coupling interface of the treatment head in dry-head lithotripsy, and this can pose a significant barrier to transmission of shock wave energy to the focal zone. Breakage of model stones is very sensitive to the presence of air pockets at the coupling interface. The quality of routine coupling is highly variable, and it seems quite feasible that the way in which the coupling gel is applied may have a significant effect on the quality of coupling. Therefore, attempts to find the best coupling regime may be valuable to perform, and preliminary results of in vitro tests are presented in this report. Experiments were conducted using gel or castor oil as coupling agents. The test tank was coupled through a transparent Mylar membrane to the water-filled cushion of the treatment head, so that pockets of air trapped between the two coupling surfaces could be observed and photographed. It is shown that the quality of coupling can be improved by applying an excessive amount of gel to just the water cushion of the lithotripter, while applying gel to both the water cushion and the Mylar membrane typically gives poor coupling. Repeat decoupling and recoupling substantially degraded the quality of coupling, reducing shock wave energy density at the target by ∼80%. It was also observed that using castor oil as a coupling medium does not guarantee air-free coupling.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Pages368-371
Number of pages4
Volume900
StatePublished - 2007
Event1st Annual International Urolithiasis Research Symposium - Indianapolis, IN, United States
Duration: Nov 2 2006Nov 3 2006

Other

Other1st Annual International Urolithiasis Research Symposium
CountryUnited States
CityIndianapolis, IN
Period11/2/0611/3/06

Fingerprint

cushions
castor oil
gels
Mylar (trademark)
air
shock waves
water
membranes
decoupling
flux density
oils
rocks
energy

Keywords

  • Air pockets
  • Bubbles
  • Castor oil
  • Coupling
  • Coupling gel
  • Shock wave lithotripsy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Pishchalnikov, Y. A., McAteer, J. A., Neucks, J. S., Pishchalnikova, I. V., & Williams, J. (2007). The problem of coupling in dry-head lithotripsy. In AIP Conference Proceedings (Vol. 900, pp. 368-371)

The problem of coupling in dry-head lithotripsy. / Pishchalnikov, Yuri A.; McAteer, James A.; Neucks, Joshua S.; Pishchalnikova, Irina V.; Williams, James.

AIP Conference Proceedings. Vol. 900 2007. p. 368-371.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Pishchalnikov, YA, McAteer, JA, Neucks, JS, Pishchalnikova, IV & Williams, J 2007, The problem of coupling in dry-head lithotripsy. in AIP Conference Proceedings. vol. 900, pp. 368-371, 1st Annual International Urolithiasis Research Symposium, Indianapolis, IN, United States, 11/2/06.
Pishchalnikov YA, McAteer JA, Neucks JS, Pishchalnikova IV, Williams J. The problem of coupling in dry-head lithotripsy. In AIP Conference Proceedings. Vol. 900. 2007. p. 368-371
Pishchalnikov, Yuri A. ; McAteer, James A. ; Neucks, Joshua S. ; Pishchalnikova, Irina V. ; Williams, James. / The problem of coupling in dry-head lithotripsy. AIP Conference Proceedings. Vol. 900 2007. pp. 368-371
@inproceedings{6946221d19854965bb9601474087ad86,
title = "The problem of coupling in dry-head lithotripsy",
abstract = "Recent in vitro studies have shown that air pockets can get trapped at the coupling interface of the treatment head in dry-head lithotripsy, and this can pose a significant barrier to transmission of shock wave energy to the focal zone. Breakage of model stones is very sensitive to the presence of air pockets at the coupling interface. The quality of routine coupling is highly variable, and it seems quite feasible that the way in which the coupling gel is applied may have a significant effect on the quality of coupling. Therefore, attempts to find the best coupling regime may be valuable to perform, and preliminary results of in vitro tests are presented in this report. Experiments were conducted using gel or castor oil as coupling agents. The test tank was coupled through a transparent Mylar membrane to the water-filled cushion of the treatment head, so that pockets of air trapped between the two coupling surfaces could be observed and photographed. It is shown that the quality of coupling can be improved by applying an excessive amount of gel to just the water cushion of the lithotripter, while applying gel to both the water cushion and the Mylar membrane typically gives poor coupling. Repeat decoupling and recoupling substantially degraded the quality of coupling, reducing shock wave energy density at the target by ∼80{\%}. It was also observed that using castor oil as a coupling medium does not guarantee air-free coupling.",
keywords = "Air pockets, Bubbles, Castor oil, Coupling, Coupling gel, Shock wave lithotripsy",
author = "Pishchalnikov, {Yuri A.} and McAteer, {James A.} and Neucks, {Joshua S.} and Pishchalnikova, {Irina V.} and James Williams",
year = "2007",
language = "English",
isbn = "0735404062",
volume = "900",
pages = "368--371",
booktitle = "AIP Conference Proceedings",

}

TY - GEN

T1 - The problem of coupling in dry-head lithotripsy

AU - Pishchalnikov, Yuri A.

AU - McAteer, James A.

AU - Neucks, Joshua S.

AU - Pishchalnikova, Irina V.

AU - Williams, James

PY - 2007

Y1 - 2007

N2 - Recent in vitro studies have shown that air pockets can get trapped at the coupling interface of the treatment head in dry-head lithotripsy, and this can pose a significant barrier to transmission of shock wave energy to the focal zone. Breakage of model stones is very sensitive to the presence of air pockets at the coupling interface. The quality of routine coupling is highly variable, and it seems quite feasible that the way in which the coupling gel is applied may have a significant effect on the quality of coupling. Therefore, attempts to find the best coupling regime may be valuable to perform, and preliminary results of in vitro tests are presented in this report. Experiments were conducted using gel or castor oil as coupling agents. The test tank was coupled through a transparent Mylar membrane to the water-filled cushion of the treatment head, so that pockets of air trapped between the two coupling surfaces could be observed and photographed. It is shown that the quality of coupling can be improved by applying an excessive amount of gel to just the water cushion of the lithotripter, while applying gel to both the water cushion and the Mylar membrane typically gives poor coupling. Repeat decoupling and recoupling substantially degraded the quality of coupling, reducing shock wave energy density at the target by ∼80%. It was also observed that using castor oil as a coupling medium does not guarantee air-free coupling.

AB - Recent in vitro studies have shown that air pockets can get trapped at the coupling interface of the treatment head in dry-head lithotripsy, and this can pose a significant barrier to transmission of shock wave energy to the focal zone. Breakage of model stones is very sensitive to the presence of air pockets at the coupling interface. The quality of routine coupling is highly variable, and it seems quite feasible that the way in which the coupling gel is applied may have a significant effect on the quality of coupling. Therefore, attempts to find the best coupling regime may be valuable to perform, and preliminary results of in vitro tests are presented in this report. Experiments were conducted using gel or castor oil as coupling agents. The test tank was coupled through a transparent Mylar membrane to the water-filled cushion of the treatment head, so that pockets of air trapped between the two coupling surfaces could be observed and photographed. It is shown that the quality of coupling can be improved by applying an excessive amount of gel to just the water cushion of the lithotripter, while applying gel to both the water cushion and the Mylar membrane typically gives poor coupling. Repeat decoupling and recoupling substantially degraded the quality of coupling, reducing shock wave energy density at the target by ∼80%. It was also observed that using castor oil as a coupling medium does not guarantee air-free coupling.

KW - Air pockets

KW - Bubbles

KW - Castor oil

KW - Coupling

KW - Coupling gel

KW - Shock wave lithotripsy

UR - http://www.scopus.com/inward/record.url?scp=34248222705&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34248222705&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:34248222705

SN - 0735404062

SN - 9780735404069

VL - 900

SP - 368

EP - 371

BT - AIP Conference Proceedings

ER -