Device for determining myocardial function and corresponding procedure and method
First Claim
Patent Images
1. A pacemaker comprising:
- a natural heart acceleration sensor;
a signal generator coupled to the sensor to provide a signal representative of the natural heart acceleration;
a processor connected to receive the signal for determining a value indicative of a characteristic of the signal during a selected time segment and calculating the difference between the determined value and a reference value, the processor being operative to select a pacing rate based upon the difference between the determined value and the reference value;
a pulse generator responsive to the selected pacing rate to generate stimulating pulses corresponding to the selected pacing rate; and
at least one electrode for applying the stimulation pulses to at least one chamber of a patient'"'"'s heart.
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Abstract
The device senses Natural Heart Acceleration (NHA), isolating at least one segment (t) thereof corresponding to an isovolumetric phase, such as isovolumetric contraction (P1, P2) and/or isovolumetric relaxation (P3, P4). Preferentially, the action of isolation of the aforesaid segment is made starting from the electrocardiogram (ECG) signal. Among other things, the device may be used to carry out pacing functions (pacemaker, defibrillator, pacer cardioverter defibrillator) and/or to pick up, possibly by telemetry, data on the myocardial function and/or also to control a system of drug administration.
162 Citations
46 Claims
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1. A pacemaker comprising:
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a natural heart acceleration sensor; a signal generator coupled to the sensor to provide a signal representative of the natural heart acceleration; a processor connected to receive the signal for determining a value indicative of a characteristic of the signal during a selected time segment and calculating the difference between the determined value and a reference value, the processor being operative to select a pacing rate based upon the difference between the determined value and the reference value; a pulse generator responsive to the selected pacing rate to generate stimulating pulses corresponding to the selected pacing rate; and at least one electrode for applying the stimulation pulses to at least one chamber of a patient'"'"'s heart. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A pacemaker comprising:
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a natural heart acceleration sensor; means for generating a signal representative of the natural heart acceleration; means for selecting at least one time segment of the natural heart acceleration signal; means for processing the signal during the selected time segment to determine a value indicative of a characteristic of the signal during the selected time segment; means for determining the difference between the determined value and a reference value; means for selecting a pacing rate based upon the difference between the determined value and the reference value; and means for providing stimulation pulses to at least one chamber of a patient'"'"'s heart at the selected pacing rate. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for controlling a heart pacemaker comprising:
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sensing a natural heart acceleration of a patient; generating a signal representative of the natural heart acceleration; selecting at least one time segment of the natural heart acceleration signal; processing the signal during the selected time segment to determine a value indicative of a characteristic of the signal during the selected time segment; determining the difference between the determined value and a reference value; selecting a pacing rate based upon the difference between the determined value and the reference value; and pacing at least one chamber of the patient'"'"'s heart at the selected pacing rate. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification