Conversion of an HM3 lithotripter into a research device

Area of Science:

• Biomedical Engineering
• Medical Devices
• Shockwave Lithotripsy

Background:

• The Dornier HM3 lithotripter is a well-established electrohydraulic shockwave generator.
• Modification of existing medical devices can provide cost-effective research platforms.

Purpose of the Study:

• To detail the conversion of a Dornier HM3 lithotripter into a specialized research instrument.
• To assess the performance characteristics of the modified lithotripter for experimental use.

Main Methods:

• A donated Dornier HM3 lithotripter was disassembled, transported, and reassembled in a laboratory setting.
• Modifications were made to adapt the device for research purposes.
• Pressure measurements and kidney stone model fragmentation tests were conducted to evaluate performance.

Main Results:

• Pressure waveforms exhibited typical electrohydraulic lithotripter characteristics, reaching approximately 50 MPa.
• Fragmentation tests on kidney stone models yielded results consistent with electrohydraulic shockwave lithotripsy.
• Pressure measurements showed no significant change compared to historical data for the same device.

Conclusions:

• The modified Dornier HM3 serves as a reliable shockwave generator for in vitro experiments.
• Simplified components (smaller water tank, positioner, no X-ray) facilitate research with small samples like cell suspensions.
• The converted device offers a well-characterized and dependable shockwave source for laboratory investigations.