IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0202297
(2002-07-23)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Schwegman, Lundberg, Woessner &
|
인용정보 |
피인용 횟수 :
96 인용 특허 :
97 |
초록
▼
A system and method for classifying cardiac complexes sensed during a tachycardia episode. A first cardiac signal and a second cardiac signal are sensed, where the first cardiac signal has a voltage. A first cardiac complex and a second cardiac complex of a cardiac cycle are detected in the first an
A system and method for classifying cardiac complexes sensed during a tachycardia episode. A first cardiac signal and a second cardiac signal are sensed, where the first cardiac signal has a voltage. A first cardiac complex and a second cardiac complex of a cardiac cycle are detected in the first and second cardiac signal, respectively. A predetermined alignment feature is identified in the second cardiac complex. A datum is defined, or positioned, at a specified interval from the predetermined alignment feature of the second cardiac complex. Voltage values are then measured from the first cardiac complex at each of two or more measurement intervals from the datum. The voltage values are then compared voltage values measured from NSR cardiac complexes to classify the first cardiac complex is either a ventricular tachycardia complex or a supraventricular tachycardiac complex.
대표청구항
▼
1. A system, comprising:at least one pacing electrode; at least a first defibrillation electrode and a second defibrillation electrode; a sensing system coupled to the at least one pacing electrode and the first defibrillation electrode and the second defibrillation electrode, wherein the sensing sy
1. A system, comprising:at least one pacing electrode; at least a first defibrillation electrode and a second defibrillation electrode; a sensing system coupled to the at least one pacing electrode and the first defibrillation electrode and the second defibrillation electrode, wherein the sensing system detects a first cardiac signal between the first defibrillation electrode and the second defibrillation electrode and a second cardiac signal through the at least one pacing electrode; a control system coupled to the sensing system, wherein the control system monitors the first cardiac signal for a first cardiac complex and the second cardiac signal for a second cardiac complex, wherein the first cardiac complex and the second cardiac complex represent a cardiac cycle; an alignment circuit coupled to the control system, wherein the alignment circuit detects the first cardiac complex in the first cardiac signal; an R-wave detector circuit coupled to the control system, wherein the R-wave detector circuit detects the second cardiac complex in the second cardiac signal and provides the second cardiac signal to the alignment circuit, wherein the alignment circuit analyzes the second cardiac complex to locate a predetermined alignment feature on the second cardiac complex and positions a datum at a specified interval from the alignment feature on the second cardiac complex, and wherein the alignment circuit selects two or more morphological features alone the first cardiac complex and determines two or more measurement intervals between the datum and the two or more morphological features; and a morphology analyzing circuit coupled to the control system, wherein the morphology analyzing circuit measures a voltage value of the first cardiac signal at each of the two or more measurement intervals from the datum. 2. The system of claim 1, including a vector comparison circuit coupled to the control system, the control system including memory to store at least one template feature vector, wherein the vector comparison circuit receives the voltage values measured at the measurement intervals, creates a complex feature vector for the sensed first cardiac complex, compares the complex feature vector to a template feature vector, and classifies the first cardiac complex based on the comparison of the complex feature vector and the template feature vector.3. The system of claim 2, wherein the vector comparison circuit calculates a correlation coefficient from the template feature vector and the complex feature vector and classifies the first cardiac complex as a VT complex when the correlation coefficient is less than or equal to a predetermined threshold, and classifies the first cardiac complex as an SVT complex when the correlation coefficient is greater than the predetermined threshold.4. The system of claim 3, wherein the sensing system detects a plurality of the cardiac cycles in the first cardiac signal and the second cardiac signal, the vector comparison circuit-classifies a predetermined number of the first cardiac complexes, and the control system declares a ventricular tachycardia episode when a threshold number of the predetermined number of the first cardiac complexes are classified as ventricular tachycardia complexes.5. The system of claim 4, wherein the control system declares a supraventricular tachycardia episode when the threshold number of the predetermined number of the first cardiac complexes are classified as supraventricular tachycardia complexes.6. The system of claim 2, including a supraventricular pacing electrode and a pace output circuit, wherein the supraventricular pacing electrode is coupled to the pace output circuit, and the pace output circuit is coupled to the control system, wherein the pace output circuit delivers electrical pulses to the supraventricular pacing electrode under the control of the control system; and wherein:the control system monitors the first cardiac signal for a first model cardiac complex and the second cardiac signal for a second model cardiac complex as electrical pulses are delivered to the supraventricular pacing electrode; the alignment circuit detects the first model cardiac complex in the first cardiac signal; the R-wave detector circuit detects the second model cardiac complex in the second cardiac signal and provides the second cardiac signal to the alignment circuit, wherein the alignment circuit analyzes the second model cardiac complex to locate the predetermined alignment feature on the second model cardiac complex and positions the datum at the specified interval from the alignment feature on the second model cardiac complex; and the morphology analyzing circuit measures the voltage value of the first model cardiac signal at each of the two or more measurement intervals from the datum to create the template feature vector. 7. The system of claim 6, wherein the system further includes:a medical device programmer; and a transmitter/receiver coupled to the control system, wherein the transmitter/receiver transmits signals to and receives signals from the medical device programmer, wherein the medical device programmer transmits a first signal to control the alignment circuit to locate the predetermined alignment feature on the second model cardiac complex and to position the datum at the specified interval from the alignment feature on the second model cardiac complex, and transmits a second signal to supply the two or more measurement intervals to the morphology analyzing circuit. 8. The system of claim 2, whereinthe control system monitors the first cardiac signal for a first model cardiac complex and the second cardiac signal for a second model cardiac complex during normal sinus rhythm; the alignment circuit detects the first model cardiac complex in the first cardiac signal; the R-wave detector circuit detects the second model cardiac complex in the second cardiac signal and provides the second cardiac signal to the alignment circuit, wherein the alignment circuit analyzes the second model cardiac complex to locate the predetermined alignment feature on the second model cardiac complex and positions the datum at the specified interval from the alignment feature on the second model cardiac complex; and the morphology analyzing circuit measures the voltage value of the first model cardiac signal at each of the two or more measurement intervals from the datum to create the template feature vector. 9. The system of claim 8, wherein the system further includes:a medical device programmer; and a transmitter/receiver coupled to the control system, wherein the transmitter/receiver transmits signals to and receives signals from the medical device programmer, wherein the medical device programmer transmits a first signal to control the alignment circuit to locate the predetermined alignment feature on the second model cardiac complex and to position the datum at the specified interval from the alignment feature on the second model cardiac complex, and transmits a second signal to supply the two or more measurement intervals to the morphology analyzing circuit. 10. A system, comprising:at least one pacing electrode; at least first and second defibrillation electrodes; a sensing system, coupled to the at least one pacing electrode and the first and second defibrillation electrodes, to detect a first cardiac signal between the first and second defibrillation electrodes, and to detect a second cardiac signal using the at least one pacing electrode; a control system, coupled to the sensing system, to monitor the first cardiac signal for a first cardiac complex, and to monitor the second cardiac signal for a second cardiac complex defining the same heart chamber contraction; an alignment circuit, coupled to the control system, wherein the alignment circuit detects the first cardiac complex in the first cardiac signal; an R-wave detector circuit, coupled to the control system, to detect the second cardiac complex in the second cardiac signal, and to provide the second cardiac signal to the alignment circuit to locate a predetermined alignment feature on the second cardiac complex, to position a datum at a specified time interval from the alignment feature on the second cardiac complex, to select two or more morphological features along the first cardiac complex, and to determine two or more measurement intervals between the datum and the two or more morphological features; and a morphology analyzing circuit, coupled to the control system, to measure a voltage value of the first cardiac signal at each of the two or more measurement intervals from the datum. 11. The system of claim 10, further comprising a vector comparison circuit, coupled to the control system, to receive the voltage values measured at the measurement intervals and to create a complex feature vector for the sensed first cardiac complex.12. The system of claim 11, wherein the control system includes memory to store at least one template feature vector, and wherein the vector comparison circuit is operable to compare the complex feature vector to a template feature vector.13. The system of claim 12, in which the vector comparison circuit is operable to classify the first cardiac complex using the comparison of the complex feature vector and the template feature vector.14. The system of claim 11, wherein the vector comparison circuit is operable to calculate a correlation coefficient from the template feature vector and the complex feature vector.15. The system of claim 14, wherein the vector comparison circuit is operable to make a comparison between the correlation coefficient and a threshold.16. The system of claim 15, wherein the vector comparison circuit is operable to classify the first cardiac complex using the comparison.17. A system, comprising:at least one pacing electrode; at least first and second defibrillation electrodes; a sensing system, coupled to the at least one pacing electrode and the first and second defibrillation electrodes, to detect a first cardiac signal between the first and second defibrillation electrodes, and to detect a second cardiac signal using the at least one pacing electrode; a control system, coupled to the sensing system, to monitor the first cardiac signal for a first cardiac complex, and to monitor the second cardiac signal for a second cardiac complex defining the same heart chamber contraction, the control system including memory to store at least one template feature vector; an alignment circuit, coupled to the control system, wherein the alignment circuit detects the first cardiac complex in the first cardiac signal; an R-wave detector circuit, coupled to the control system, to detect the second cardiac complex in the second cardiac signal, and to provide the second cardiac signal to the alignment circuit to locate a predetermined alignment feature on the second cardiac complex and to position a datum at a specified time interval from the alignment feature on the second cardiac complex; a morphology analyzing circuit, coupled to the control system, to measure a voltage value of the first cardiac signal at each of two or more measurement intervals from the datum; and means for creating a complex feature vector for the sensed first cardiac complex, comparing the complex feature vector to a template feature vector, and using the comparison for classifying the first cardiac complex as either a ventricular tachyarrhythmia (VT) or a supraventricular arrhythmia (SVT).
※ AI-Helper는 부적절한 답변을 할 수 있습니다.