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:
Nov. 02, 1999
Filed:
May. 06, 1998
Indra B Nigam, Lake Oswego, OR (US);
Abstract
An apparatus for detecting ventricular tachycardia includes a first and snd calculation unit, each having an input side connected to a ventricle sensor and an atrium sensor, respectively, and to a timer, for calculating the R--R and P--P intervals between respective successive electrical activities in the atrium and in the ventricle. A threshold value memory stores at least one threshold value for the R--R intervals in memory. A first comparator unit compares the R--R intervals with the at least one threshold value. A first and second interval memory store a predetermined number of calculated R--R and P--P intervals, respectively, or mean R--R and mean P--P interval values. A second comparator unit compares the P--P intervals with the R--R intervals. A third and fourth calculation unit, connected to the output of the first and second calculation unit and/or of the first and second interval memory unit, respectively, calculate the change over time between successive P--P and R--R intervals. First and second criterion memories stores predetermined stability criterion for the change over time between successive P--P and R--R intervals, respectively. A third and fourth comparator unit compare the calculated change over time in the P--P and R--R intervals with the associated stability criterion stored in memory.