Surgery – Truss – Perineal
Patent
1987-10-15
1989-05-30
Thaler, Michael H.
Surgery
Truss
Perineal
128328, A61B 1722
Patent
active
048340740
ABSTRACT:
The shock wave generator preferably includes a primary coil with preceding secondary diaphragm. The primary coil is acted upon with a current pulse by discharge of a capacitor via a spark gap, whereby a shock wave is triggered. The time response of the discharge current is determined with a measuring resistor and supplied to the first input of a first comparator. To the second input of the comparator a reference value is supplied. If the difference between the measured value and the reference value exceeds a given value, an alarm signal is given, which actuates e.g. an alarm signaling device and/or blocks the triggering of additional shock waves. The pressure response of the shock wave at given points of the path is determined by means of pressure pickups and another comparator. An excessive difference from an expected pressure reference value leads to an alarm signal. An advantage of the safety measures is that a deterioration of the electrical contacts of the spark gap, short circuits in the primary coil, deformations of the secondary diaphragm, gas accumulations in the shock wave generator and other irregularities can be recognized in good time.
REFERENCES:
patent: 2937640 (1960-05-01), Bastir
patent: 3489241 (1970-01-01), Stienberg
patent: 4390026 (1983-06-01), Christman
Jay Mark H.
Siemens Aktiengesellschaft
Thaler Michael H.
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