Apparatus, software, and methods for cardiac pulse detection using a piezoelectric sensor
First Claim
1. A medical device for detecting the presence of a cardiac pulse, comprising:
- (a) a piezoelectric sensor having a transducing element configured for placement on the surface of a patient'"'"'s body, the transducing element being adapted to sense movement in the patient'"'"'s body due to a cardiac pulse and produce piezoelectric signal data in response thereto; and
(b) processing circuitry configured to analyze the piezoelectric signal data for a feature indicative of the presence of a cardiac pulse and determine whether a cardiac pulse is present based on the feature.
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Accused Products
Abstract
Signal data obtained from a piezoelectric sensor placed on a patient'"'"'s body is used to detect the presence of a cardiac pulse. The piezoelectric sensor has a transducing element adapted to sense movement due to a cardiac pulse and produce piezoelectric signal data in response thereto. Processing circuitry analyzes the piezoelectric signal data for a feature indicative of a cardiac pulse and determines whether a cardiac pulse is present in the patient based on the feature. In one aspect, the feature may be a temporal feature such as a relative change in energy. In another aspect, the feature may be a spectral feature such as the energy or frequency of a peak in the energy spectrum of the signal. In yet another aspect, the feature may be obtained by comparing the piezoelectric signal data with a previously-identified pattern known to predict the presence of a cardiac pulse. Multiple features may also be obtained from the piezoelectric signal data and classified to determine the presence of a cardiac pulse.
214 Citations
123 Claims
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1. A medical device for detecting the presence of a cardiac pulse, comprising:
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(a) a piezoelectric sensor having a transducing element configured for placement on the surface of a patient'"'"'s body, the transducing element being adapted to sense movement in the patient'"'"'s body due to a cardiac pulse and produce piezoelectric signal data in response thereto; and
(b) processing circuitry configured to analyze the piezoelectric signal data for a feature indicative of the presence of a cardiac pulse and determine whether a cardiac pulse is present based on the feature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An electrotherapy device, comprising:
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(a) a piezoelectric sensor having a transducing element configured for placement on the surface of a patient'"'"'s body, the transducing element being adapted to sense movement in the patient'"'"'s body due to a cardiac pulse and produce piezoelectric signal data in response thereto;
(b) an electrotherapy generator adapted for delivering electrotherapy to the patient; and
(c) processing circuitry configured to analyze the piezoelectric signal data for a feature indicative of the presence of a cardiac pulse in the patient and determine the presence of a cardiac pulse based on the feature, the processing circuitry being further configured to prompt the delivery of an electrotherapy to the patient based on the presence of a cardiac pulse. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. An electrotherapy device, comprising:
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(a) a piezoelectric sensor having a transducing element configured for placement on the surface of a patient'"'"'s body, the transducing element being adapted to sense movement in the patient'"'"'s body due to a cardiac pulse and produce piezoelectric signal data in response thereto;
(b) an electrotherapy generator for delivering pacing stimuli to the patient; and
(c) processing circuitry configured to analyze the piezoelectric signal data and determine whether a cardiac pulse occurred in the patient following the delivery of a pacing stimulus to the patient. - View Dependent Claims (47, 48, 49)
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50. An article comprising a storage medium having device-executable instructions stored thereon, in which when the instructions are executed by at least one device, they result in:
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(a) obtaining piezoelectric signal data from a sensor having a piezoelectric transducing element placed on the surface of a patient'"'"'s body;
(b) analyzing the piezoelectric signal data for a feature indicative of the presence of a cardiac pulse; and
(c) determining whether a cardiac pulse is present in the patient based on the feature in the piezoelectric signal data. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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65. An article comprising a storage medium having device-executable instructions stored thereon, in which when the instructions are executed by at least one device, they result in:
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(a) obtaining piezoelectric signal data from a sensor having a piezoelectric transducing element placed on the surface of a patient'"'"'s body;
(b) estimating a first energy in the piezoelectric signal data;
(c) estimating a second energy in the piezoelectric signal data;
(d) determining a relative change in energy between the first energy and the second energy; and
(e) determining the presence of a cardiac pulse in the patient based on the determined relative change in energy. - View Dependent Claims (66, 67)
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68. An article comprising a storage medium having device-executable instructions stored thereon, in which when the instructions are executed by at least one device, they result in:
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(a) obtaining piezoelectric signal data from a sensor having a piezoelectric transducing element placed on the surface of a patient'"'"'s body;
(b) calculating an energy spectrum of the piezoelectric signal data;
(c) evaluating the energy spectrum for a, spectral energy feature indicative of the presence of a cardiac pulse; and
(d) determining the presence of a cardiac pulse in the patient based on the spectral energy feature. - View Dependent Claims (69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81)
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82. An article comprising a storage medium having device-executable instructions stored thereon, in which when the instructions are executed by at least one device, they result in:
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(a) delivering a pacing stimulus to the patient;
(b) obtaining piezoelectric signal data from a sensor having a piezoelectric transducing element placed on the surface of the patient'"'"'s body;
(c) analyzing the piezoelectric signal data to determine whether a cardiac pulse occurred in the patient after delivery of the pacing stimulus; and
(d) if a cardiac pulse did not occur in the patient after delivery of the pacing stimulus, increasing the current of further pacing stimuli to be delivered to the patient. - View Dependent Claims (83, 84, 85, 86)
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87. A method of determining the presence of a cardiac pulse, comprising:
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(a) obtaining piezoelectric signal data from a sensor having a piezoelectric transducing element placed on the surface of a patient'"'"'s body;
(b) analyzing the piezoelectric signal data for a feature indicative of the presence of a cardiac pulse; and
(c) determining whether a cardiac pulse is present in the patient based on the feature in the piezoelectric signal data. - View Dependent Claims (88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101)
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102. A method of determining the presence of a cardiac pulse, comprising:
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(a) obtaining piezoelectric signal data from a sensor having a piezoelectric transducing element placed on the surface of a patient'"'"'s body;
(b) estimating a first energy in the piezoelectric signal data;
(c) estimating a second energy in the piezoelectric signal data;
(d) determining a relative change in energy between the first energy and the second energy; and
(e) determining the presence of a cardiac pulse in the patient based on the determined relative change in energy. - View Dependent Claims (103, 104)
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105. A method of determining the presence of a cardiac pulse, comprising:
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(a) obtaining piezoelectric signal data from a sensor having a piezoelectric transducing element placed on the surface of a patient'"'"'s body;
(b) calculating an energy spectrum of the piezoelectric signal data;
(c) evaluating the energy spectrum for a spectral energy feature indicative of the presence of a cardiac pulse; and
(d) determining the presence of a cardiac pulse in the patient based on the spectral energy feature. - View Dependent Claims (106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118)
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119. A method for delivering electrotherapy that provides pacing stimuli and seeks capture of a cardiac pulse in a patient, the method comprising:
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(a) delivering a pacing stimulus to the patient;
(b) obtaining piezoelectric signal data from a sensor having a piezoelectric transducing element placed on the surface of the patient'"'"'s body;
(c) analyzing the piezoelectric signal data to determine whether a cardiac pulse occurred in the patient after delivery of the pacing stimulus; and
(d) if a cardiac pulse did not occur in the patient after delivery of the pacing stimulus, increasing the current of further pacing stimuli to be delivered to the patient. - View Dependent Claims (120, 121, 122, 123)
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Specification