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:
Dec. 31, 2002
Filed:
Mar. 21, 2001
Åsa Uhrenius, Stockholm, SE;
Berit Larsson, Danderyd, SE;
Peter Andersson, Stockholm, SE;
Göran Budgifvars, Spånga, SE;
Feresteh Shojael, Solna, SE;
St. Jude Medical AB, Järfälla, SE;
Abstract
A heart stimulator has an evoked response detector which determines evoked response in the presence of polarization. To determine the magnitude of the polarization for different stimulation amplitudes, the electrode signals picked up by a lead after the delivery of a stimulation pulse having a selected amplitude are measured. A polarization signal is obtained from the picked up signals, and this polarization signal, with modification, is subtracted from signals picked up following subsequently emitted stimulation pulses. Dependent on the subtraction result, a determination is made as to whether an evoked response has occurred.