ATRIAL AND VENTRICULAR DEMAND PACER WITH SEPARATE ATRIAL AND VENTRICULAR BEAT DETECTORS

• US 3,747,604 A
• Filed: 12/06/1971
• Issued: 07/24/1973
• Est. Priority Date: 12/15/1969
• Status: Expired due to Term

• Current Assignee: Barouh V. Berkovits
• Original Assignee: Barouh V. Berkovits
• Inventors: Berkovits, Barouh V.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US05/205,195
• Time in Patent Office: 596 Days
• Field of Search: 128/419P,421,422
• US Class Current: 607/9
• CPC Class Codes: A61N 1/368 comprising more than one electrode co-operating with different heart regions A61N1/3622, A61N1/3627 take precedence

Abstract

An atrial and ventricular pacer in which competition between spontaneous atrial activity and atrial stimulation is prevented. In the conventional type atrial and ventricular pacer, the detection of a QRS wave re-starts both the atrial and ventricular timing circuits, but spontaneous atrial activity does not inhibit the generation of an atrial stimulating pulse. In the description of an illustrative embodiment contained herein, by preventing the generation of such a pulse when a spontaneous atrial beat is detected the batteries have a longer life.

Claims

1. A pacer comprising terminal means for connection to a patient'"'"''"'"'s heart for atrial stimulation, terminal means for connection to said patient'"'"''"'"'s heart for ventricular stimulation, means for detecting an atrial beat of said patient'"'"''"'"'s heart, means for detecting a ventricular beat of said patient'"'"''"'"'s heart, means responsive to the operation of said ventricular detecting means for generating an electrical stimulus on said ventricular terminal means following a first predetermined time interval after the last detected ventricular beat only of said patient'"'"''"'"'s heart, means for generating an electrical stimulus on said atrial terminal means following a second predetermined time interval after the last ventricular beat only of said patient'"'"''"'"'s heart, and means for preventing the generation of an electrical stimulus on said atrail terminal means responsive to the detection of an atrial beat of said patient'"'"''"'"'s heart during said second predetermined time interval.

2. A pacer in accordance with claim 1 wherein said first predetermined time interval is longer than said second predetermined time interval.

3. A pacer in accordance with claim 2 wherein said second predetermined time interval is shorter than a probable minimum interval between successive ventricular beats of said patient'"'"''"'"'s heart and is longer than a probable maximum interval between a ventricular beat and the next atrail beat of said patient'"'"''"'"'s heart.

4. A pacer in accordance with claim 3 wherein said first predetermined time interval is longer than the usually-occurring interval between successive ventricular beats of said patient'"'"''"'"'s heart.

5. A pacer comprising terminal means for connection to a patient'"'"''"'"'s heart for ventricular stimulation, terminal means for connection to said patient'"'"''"'"'s heart for atrial stimulation, a first timing circuit means foR generating an electrical impulse on said ventricular terminal means, a second timing circuit means for generating an electrical impulse on said atrial terminal means, means for detecting a ventricular beat of said patient'"'"''"'"'s heart and responsive thereto for resetting both of said first and second timing circuit means, and means for detecting an atrial beat of said patient'"'"''"'"'s heart and responsive thereto for resetting said second timing circuit.

6. A pacer in accordance with claim 5 wherein the period of said first timing circuit means is longer than a probable maximum interval between two successive ventricular beats of said patient'"'"''"'"'s heart.

7. A pacer in accordance with claim 6 wherein the period of said second timing circuit means is longer than a probable maximum interval between a ventricular beat and the next atrail beat of said patient'"'"''"'"'s heart.