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Effect of lithotripter focal width on stone comminution in shock wave lithotripsy.

Publication ,  Journal Article
Qin, J; Simmons, WN; Sankin, G; Zhong, P
Published in: J Acoust Soc Am
April 2010

Using a reflector insert, the original HM-3 lithotripter field at 20 kV was altered significantly with the peak positive pressure (p(+)) in the focal plane increased from 49 to 87 MPa while the -6 dB focal width decreased concomitantly from 11 to 4 mm. Using the original reflector, p(+) of 33 MPa with a -6 dB focal width of 18 mm were measured in a pre-focal plane 15-mm proximal to the lithotripter focus. However, the acoustic pulse energy delivered to a 28-mm diameter area around the lithotripter axis was comparable ( approximately 120 mJ). For all three exposure conditions, similar stone comminution ( approximately 70%) was produced in a mesh holder of 15 mm after 250 shocks. In contrast, stone comminution produced by the modified reflector either in a 15-mm finger cot (45%) or in a 30-mm membrane holder (14%) was significantly reduced from the corresponding values (56% and 26%) produced by the original reflector (no statistically significant differences were observed between the focal and pre-focal planes). These observations suggest that a low-pressure/broad focal width lithotripter field will produce better stone comminution than its counterpart with high-pressure/narrow focal width under clinically relevant in vitro comminution conditions.

Duke Scholars

Published In

J Acoust Soc Am

DOI

EISSN

1520-8524

Publication Date

April 2010

Volume

127

Issue

4

Start / End Page

2635 / 2645

Location

United States

Related Subject Headings

  • Transducers, Pressure
  • Time Factors
  • Pressure
  • Phantoms, Imaging
  • Motion
  • Models, Theoretical
  • Materials Testing
  • Lithotripsy
  • Equipment Design
  • Calculi
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Qin, J., Simmons, W. N., Sankin, G., & Zhong, P. (2010). Effect of lithotripter focal width on stone comminution in shock wave lithotripsy. J Acoust Soc Am, 127(4), 2635–2645. https://doi.org/10.1121/1.3308409
Qin, Jun, W Neal Simmons, Georgy Sankin, and Pei Zhong. “Effect of lithotripter focal width on stone comminution in shock wave lithotripsy.J Acoust Soc Am 127, no. 4 (April 2010): 2635–45. https://doi.org/10.1121/1.3308409.
Qin J, Simmons WN, Sankin G, Zhong P. Effect of lithotripter focal width on stone comminution in shock wave lithotripsy. J Acoust Soc Am. 2010 Apr;127(4):2635–45.
Qin, Jun, et al. “Effect of lithotripter focal width on stone comminution in shock wave lithotripsy.J Acoust Soc Am, vol. 127, no. 4, Apr. 2010, pp. 2635–45. Pubmed, doi:10.1121/1.3308409.
Qin J, Simmons WN, Sankin G, Zhong P. Effect of lithotripter focal width on stone comminution in shock wave lithotripsy. J Acoust Soc Am. 2010 Apr;127(4):2635–2645.

Published In

J Acoust Soc Am

DOI

EISSN

1520-8524

Publication Date

April 2010

Volume

127

Issue

4

Start / End Page

2635 / 2645

Location

United States

Related Subject Headings

  • Transducers, Pressure
  • Time Factors
  • Pressure
  • Phantoms, Imaging
  • Motion
  • Models, Theoretical
  • Materials Testing
  • Lithotripsy
  • Equipment Design
  • Calculi