Circuit for controlling an electro-therapy device

US5067953A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventor

• Peter Feucht · Teltow, DE

Key dates

• Filing date: May 11, 1990
• Grant date: Nov 26, 1991
• Expiry date: May 11, 2010

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B18/1206
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

For separating voltage potentials from a handle switch in a circuit for controlling an electro-therapy device, the circuit includes at least one electrode carrying high voltage connected to the switch, with the switch being in series with a rectifier and the series combination being electrically connected to a secondary side of a quadrupole component, which transmits alternating current and blocks direct current. The primary side of the quadrupole component is connected to an alternating current source, the secondary side being voltaically separated from the primary side. Actuation of the switch causes a directionally dependent change in an electrical parameter at the primary side of the quadrupole component. An evaluation unit is connected at the primary side, and is also connected to the electrode. The evaluation unit includes circuitry which is capable of altering the delivery of high voltage (a.c. current) to a patient via the electrode, and undertakes such alteration upon the detection of the directionally dependent change in the electrical parameter at the primary side.