scholarly journals Development of an Expansion Wave Generator for Shock Wave Therapy

2012 ◽  
Vol 1 (0) ◽  
pp. 68-73 ◽  
Author(s):  
Ryo TACHIKAWA ◽  
Akira TSUKAMOTO ◽  
Keiichi NAKAGAWA ◽  
Tatsuhiko ARAFUNE ◽  
Hongen LIAO ◽  
...  
Keyword(s):  
Shock Wave ◽  
Expansion Wave ◽  
Shock Wave Therapy ◽  
Wave Generator

DESIGN AND FABRICATION OF A SHOCK WAVE GENERATOR FOR MUSCULOSKELETAL DISORDERS

2006 ◽  
Vol 18 (01) ◽  
pp. 24-29 ◽  
Author(s):  
SHEN-MIN LIANG ◽  
KIET-HOUNG CHOW ◽  
IOANNIS MANOUSAKAS ◽  
YONG-REN PU ◽  
CHIEN-CHEN CHANG
Keyword(s):  
Shock Wave ◽  
Healing Process ◽  
Pressure Sensors ◽  
Ccd Camera ◽  
Feedback System ◽  
Electrode Erosion ◽  
Shock Wave Therapy ◽  
Electrode Gap ◽  
Wave Generator ◽  
Electrohydraulic Shock

In the past ten years, extracorporeal shock waves have been successfully used in orthopedics. The idea of shock wave therapy is the stimulation of a healing process. Electrohydraulic shock wave therapy provides higher energy density flux than electromagnetic and piezoelectric types. But electrohydraulic shock wave generators are less stable than the other two types because of electrode erosion. In this study, a shock wave generator with a controllable spark gap system has been designed in order to give steady output pressures by automatic adjustment of the electrode gap. An ellipsoidal shock wave reflector is equipped with two AC servo motors with drivers. The motor driver actuates the associated motor which is connected to an electrode base by a belt. On a designed image feedback system, a CCD camera is used as the image detection tool to measure the electrode gap. Experimental results show the coincidence of the second focus of the shock wave reflector with the gas-dynamic focus. Moreover, measurements of focused pressure and energy intensity with PCB and PVDF pressure sensors and tests of stone fragmentation efficiency have been carried out to evaluate the performance of the newly designed shock wave generator with a gap-adjusted system and an image feedback system. It is found that the designed electrohydraulic shock wave generator is stable and efficient in pressure output with a low cost of electrodes.

QUANTIFICATION OF ACOUSTIC CAVITATION PRODUCED BY A CLINICAL EXTRACORPOREAL SHOCK WAVE THERAPY SYSTEM USING A PASSIVE CYLINDRICAL DETECTOR

2008 ◽  
Vol 22 (11) ◽  
pp. 809-814 ◽  
Author(s):  
M. J. CHOI ◽  
S. C. CHO ◽  
G. S. KANG ◽  
D. G. PAENG ◽  
K. I. LEE ◽  
...  
Keyword(s):  
Shock Wave ◽  
Spectral Band ◽  
Extracorporeal Shock Wave Therapy ◽  
Acoustic Cavitation ◽  
Medical System ◽  
Shock Wave Therapy ◽  
Wave Fields ◽  
Extracorporeal Shock Wave ◽  
Wave Generator ◽  
Characteristic Features

Acoustic cavitation is regarded to play an important role in extracorporeal shock wave therapy (ESWT). However it is not yet well characterized the cavitation in ESWT due to difficulty in its measurement. This study tests NPL cavitation sensor to discuss its potential to quantify cavitation activities produced by a clinical shock wave field. In the present experiment, the sensor was located at the focus of an electromagentic shock wave generator (HnT Medical System, Korea). Measurements were repeated 15 times as varying setting numbers. It was observed that the acoustic signals recorded by the sensor contain characteristic features of broadband spikes representing cavitation. Spectral band magnitude (SBM), used as a cavitation measure, rose with the setting number. There was a threshold above which SBM soared up and had its uncertainty greately increased. The results prove the potential of the sensor in characterizing the cavitation produced by shock wave fields.

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