Implantable medical device with heart condition detection
First Claim
1. An implantable medical device for detecting a condition of a heart of a patient, said device comprising:
- a pulse generator that emits cardiac stimulating pacing pulses;
a lead comprising at least one electrode, said lead being connected to said pulse generator and being configured for implantation in the patient to deliver said cardiac stimulating pacing pulses to cardiac tissue in the patient;
an acoustic sensor configured to sense acoustic energy in the patient, said acoustic sensor emitting an acoustic sensor signal indicative of heart sounds produced by the heart of the patient;
a signal processor connected to said acoustic sensor configured to extract signal components from said acoustic sensor signal respectively corresponding to a first heart sound, known as the first heart sound S1, and a second heart sound, known as the second heart sound S2, over predetermined periods of a cardiac cycle during successive cardiac cycles, and to calculate a first energy value E1 corresponding to said first heart sound S1 and a second energy value E2 corresponding to said second heart sound S2;
a storage unit in communication with said signal processor that stores said first and second energy values E1 and E2 corresponding to said first and second heart sounds S1 and S2; and
a controller connected to said pulse generator, and configured to calculate a quotient E1/E2 for successive cardiac cycles, and to use said quotient E1/E2 to identify a condition of the heart of the patient or a change of said condition of the heart of the patient, and to control emission of said cardiac stimulating pacing pulses from said pulse generator dependent on said condition or said change of said condition.
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Abstract
A method for detecting a condition of a heart of a patient using an implantable medical device, including the steps of sensing acoustic signals indicative of heart sounds of the heart of the patient; extracting signals corresponding to a first heart sound (S1) and a second heart sound (S2) from sensed signals; calculating an energy value corresponding to a signal corresponding to the first heart sound (S1) and an energy value corresponding to the second heart sound (S2); calculating a relation between the energy value corresponding to the first heart sound and the energy value corresponding to the second heart sound for successive cardiac cycles; and using at least one relation to detect the condition or a change of the condition. A medical device for determining the posture of a patient and a computer readable medium encoded with instructions are used to perform the inventive method.
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Citations
23 Claims
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1. An implantable medical device for detecting a condition of a heart of a patient, said device comprising:
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a pulse generator that emits cardiac stimulating pacing pulses; a lead comprising at least one electrode, said lead being connected to said pulse generator and being configured for implantation in the patient to deliver said cardiac stimulating pacing pulses to cardiac tissue in the patient; an acoustic sensor configured to sense acoustic energy in the patient, said acoustic sensor emitting an acoustic sensor signal indicative of heart sounds produced by the heart of the patient; a signal processor connected to said acoustic sensor configured to extract signal components from said acoustic sensor signal respectively corresponding to a first heart sound, known as the first heart sound S1, and a second heart sound, known as the second heart sound S2, over predetermined periods of a cardiac cycle during successive cardiac cycles, and to calculate a first energy value E1 corresponding to said first heart sound S1 and a second energy value E2 corresponding to said second heart sound S2; a storage unit in communication with said signal processor that stores said first and second energy values E1 and E2 corresponding to said first and second heart sounds S1 and S2; and a controller connected to said pulse generator, and configured to calculate a quotient E1/E2 for successive cardiac cycles, and to use said quotient E1/E2 to identify a condition of the heart of the patient or a change of said condition of the heart of the patient, and to control emission of said cardiac stimulating pacing pulses from said pulse generator dependent on said condition or said change of said condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for detecting a condition of a heart of a patient using an implantable medical device, comprising the steps of:
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sensing an acoustic energy in the patient to obtain a sensed signal indicative of heart sounds of the patient over predetermined periods of a cardiac cycle during successive cardiac cycles; in said implantable medical device, extracting signal components from said sensed signal respectively corresponding to a first heart sound, known as the first heart sound S1, and a second heart sound, known as the second heart sound S2, of a cardiac cycle; in said implantable medical device, calculating a first energy value E1 corresponding to said first heart sound S1 and a second energy value E2 corresponding to said second heart sound S2; in said implantable medical device, storing said first and second energy values E1 and E2; and in said implantable medical device, calculating a quotient E1/E2 and, dependent on said quotient E1/E2, detecting said condition or a change of said condition. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification