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:
Oct. 29, 2002
Filed:
Feb. 23, 2001
Berit Larsson, Danderyd, SE;
Asa Uhrenius, Stockholm, SE;
Peter Andersson, Stockholm, SE;
Göran Budgivars, Spanga, SE;
St. Jude Medical AB, Järfälla, SE;
Abstract
A heart stimulator has an evoked response detector for determining evoked response in the presence of polarization. The heart stimulator produces stimulation pulses of different amplitudes via a lead introduced to the heart of the patient. The evoked response detector measures an electrode signal picked up by the lead after each stimulation pulse. In order to set an evoked response threshold value, the pulse generator of the stimulator is controlled to deliver at least two stimulation pulses with different amplitudes, at least one of these stimulation pulses having a high amplitude that exceeds the stimulation threshold value. A measuring unit in the evoked response detector measures the picked up electrode signals, and a calculating unit in the evoked response detector calculates the polarization for the high stimulation amplitude and identifies a measured electrode signal for the lowest possible stimulation amplitude from the measured electrode signals. The evoked response detector also has an analyzing unit which sets a threshold value for the measured electrode signal from the calculated polarization and lowest possible stimulation amplitude.