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US 5,314,449 AGranted
Rate-adaptive cardiac pacemaker
AssigneeSiemens Aktiengesellschaft
InventorAnders Lindgren
Life of this patent
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Abstract
A cardiac pacemaker, whose stimulation rate is controlled dependent on an impedance signal acquired between two electrodes, has one of the two electrodes disposed in an atrial electrode catheter and the other electrode being disposed in a separate, ventricular electrode catheter. Catheters carrying only a single electrode can thus be used, thereby avoiding the use of a bipolar electrode catheter. The two electrodes are respectively connected to two different stimulation pulse generators within the pacemaker housing, constructed as a dual chamber pacemaker.
Claims5
A rate-adaptive implantable cardiac pacemaker comprising:
- implantable dual chamber pacing means including first stimulation pulse generating means for generating atrial stimulation pulses and second stimulation pulse generating means for generating ventricular stimulation pulses;
- a first electrode, electrically connected to said first stimulation pulse generating means, and arranged on a first electrode catheter adapted for inserting said first electrode in an atrial position of a heart to be stimulated;
- a second electrode, electrically connected to said second stimulation pulse generating means, and arranged on said first or on a second electrode catheter adapted for inserting said second electrode in a ventricular position of said heart to be stimulated;
- implantable impedance measuring means, electrically connected to said first and second electrodes, for acquiring a measurement of the electrical impedance between said first and second electrodes as an indicator of the level of physical activity of a patient in whom said pacemaker is implanted;
- and
- control means electrically connected to said impedance measuring means and to said first and second stimulation pulse generating means for causing said first and second stimulation pulse generating means to respectively generate stimulation pulses at a rate matched to said physical activity level of said patient.
3 more elements
Dependencies are inferred from the claim text.