The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 1998
Filed:
Dec. 18, 1996
Michael L Lopin, Newton, MA (US);
Shervin Ayati, Sudbury, MA (US);
ZMD Corporation, Wilmington, DE (US);
Abstract
An electrotherapy circuit administers to a patient a current waveform. The electrotherapy circuit includes a charge storage device, at least two discharge electrodes connected by electrical circuitry to opposite poles of the charge storage device, a sensor that senses a patient-dependent electrical parameter (such as a patient impedance sensor), and a control circuit. The control circuit is connected to the sensor and the charge storage device and controls discharge of the charge storage device through the electrodes. The discharge of the charge storage device includes a current waveform having a sensing pulse portion, with insufficient energy for performing therapy, during which the sensor senses a patient-dependent electrical parameter (such as patient impedance), and a therapeutic discharge portion, with sufficient energy for performing therapy, having an initial discharge current controlled by the control circuit based on the patient-dependent electrical parameter (such as patient impedance) as sensed by the sensor. The sensing pulse portion has a discharge current that is at least about one-third of the initial discharge current of the therapeutic discharge portion.