A compact underwater shock wave generator using magnetic pulse compression circuit for medical applications

Abstract

Paper reports on production and focusing of microunderwater shock waves for medical applications. Shock wave focusing has various scientific, industrial and medical applications. For precise shock wave therapies near sensitive organs, such as cranioplasty in the close vicinity of the brain, a micro-shock wave source is required. A half-ellipsoidal cavity with 20.0 mm minor diameter and the ratio of major to minor diameters of 1.41 was designed and constructed as an extracorporeal shock wave (ESW) source. Underwater shock waves were generated by electric discharge produced by a magnetic pulse compression circuit (MPC) and an electrode. Input voltage and input current were measured by using an oscilloscope and a current monitor. Pressure histories were measured at different stand-off distances by using a PVDF needle and a fiber optic probe hydrophones. A wide range of peak overpressures from 10 to 150 MPa at the focus was obtained, and small focal zone and focal energy flux density were measured. It is concluded that the present compact extracorporeal shock wave generator has appropriate characteristics for application in precise and sensitive medical procedures.

Study of underwater shock wave induced embryonic modification in-vivo

“…This paper reports a preliminary study of underwater shock wave application for modification and possible control of embryonic cell differentiation and proliferation. A compact underwater shock wave generator using magnetic pulse compression circuit (MPC) was used as shock wave source [6]. Underwater shock waves were applied to medaka egg embryos through experimental setup.…”

Development of a boost converter topology for a high repetition pulsed power generator

“…Fast growth of semiconductor device technologies has offered a new research field in pulsed power application thereby induced compact, reliable and repetitive PPGs. Normally, to achieve high voltage pulses, high and fast voltage DC power sources with several conversion steps such as magnetic pulse compressor (MPC) [5] or Marx converters [6] are utilised. However, these systems are usually inflexible to control the pulsed power parameters such as rise time, duty cycle and higher repetition rate operation which may affect the load efficiency.…”