Medical Device
First Claim
1. An implantable medical device for detecting a condition of a heart of a patient, comprising:
- an activity sensor adapted to sense an activity level of said patient;
a signal processing circuit configured to extract a signal corresponding to a first heart sound (S1) from a sensed acoustic signal, said signal being received from an acoustic sensor adapted to sense an acoustic energy and to produce acoustic signals indicative of heart sounds of the heart of said patient over predetermined periods of a cardiac cycle during successive cardiac cycles; and
a controller configured to calculate a relation between a first signal corresponding to a first heart sound (S1) in said first activity level range and a second signal corresponding to a first heart sound (S1) in a second predetermined activity level range, and to compare said calculated relation with at least one reference value to detect said condition or a change of said condition.
1 Assignment
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Accused Products
Abstract
In an implantable medical device and a method and computer-readable medium for operating the medical device to detect a condition of a heart of a patient, activity level of a patient and acoustic energy in a patient are sensed, and acoustic signals are generated that are indicative of heart sounds of the patient over predetermined periods of a cardiac cycle during successive cardiac cycles. A signal corresponding to a first sound is extracted from the sensed acoustic signal of a cardiac cycle. A relation is calculated between a first signal corresponding to the first heart sound in a first activity range, and a second signal corresponding to the first heart sound in a second predetermined activity level range. The calculated relation is compared with at least one reference value to detect the condition or a change of the condition.
8 Citations
55 Claims
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1. An implantable medical device for detecting a condition of a heart of a patient, comprising:
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an activity sensor adapted to sense an activity level of said patient; a signal processing circuit configured to extract a signal corresponding to a first heart sound (S1) from a sensed acoustic signal, said signal being received from an acoustic sensor adapted to sense an acoustic energy and to produce acoustic signals indicative of heart sounds of the heart of said patient over predetermined periods of a cardiac cycle during successive cardiac cycles; and a controller configured to calculate a relation between a first signal corresponding to a first heart sound (S1) in said first activity level range and a second signal corresponding to a first heart sound (S1) in a second predetermined activity level range, and to compare said calculated relation with at least one reference value to detect said condition or a change of said condition. - View Dependent Claims (3, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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2. (canceled)
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4. The implantable medical device according to claim 4, wherein
said controller is configured to calculate said relation as a relation between an energy value corresponding to a first heart sound at said first activity level range and an energy value corresponding to a first heart sound at said second activity level range, and to compare said calculated relation with at least one reference value to detect said condition or a change of said condition.
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27. A method for operating an implantable medical device to detect a condition of a heart of a patient, comprising the steps of:
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sensing an activity level of said patient; sensing an acoustic energy; producing acoustic signals indicative of heart sounds of the heart of said patient over predetermined periods of a cardiac cycle during successive cardiac cycles; extracting a signal corresponding to a first heart sound (S1) from a sensed acoustic signal of a cardiac cycle; calculating a relation between a first signal corresponding to a first heart sound (S1) in said first activity level range and a second signal corresponding to a first heart sound (S1) in a second predetermined activity level range; and comparing said calculated relation with at least one reference value to detect said condition or a change of said condition. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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28. (canceled)
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53-54. -54. (canceled)
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55. A computer readable medium encoded with programming instructions for operating an implantable medical device to detect a condition of a heart of a patient, said programming instructions causing said medical device to:
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sensed an activity level of said patient; sensed an acoustic energy; produced acoustic signals indicative of heart sounds of the heart of said patient over predetermined periods of a cardiac cycle during successive cardiac cycles; extract a signal corresponding to a first heart sound (S1) from a sensed acoustic signal of a cardiac cycle; calculate a relation between a first signal corresponding to a first heart sound (S1) in said first activity level range and a second signal corresponding to a first heart sound (S1) in a second predetermined activity level range; and compare said calculated relation with at least one reference value to detect said condition or a change of said condition
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Specification