Device and method for determining a cardiac condition using a complex signal formed from a detected cardiac signal
First Claim
1. An implantable device for determining a cardiac condition comprising:
- a detector adapted to substantially continuously detect a heart-related signal not limited by a cardiac cycle and for forming an input signal therefrom;
an analysis unit connected to said detector and receiving said input signal therefrom, and producing a continuous analysis signal from said input signal having a real part substantially corresponding to said input signal and an imaginary part formed as a predetermined transformation of said input signal;
a calculation unit connected to said analysis unit and receiving said analysis signal therefrom, said calculation unit calculating at least two heart-related parameters from said analysis signal dependent on said real part and said imaginary part; and
a processing unit connected to said calculation unit and supplied with said heart-related parameters therefrom, said processing unit combining said heart-related parameters in a predetermined manner and identifying a cardiac condition therefrom.
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Accused Products
Abstract
In a device and a method for determining a cardiac condition from a detected cardiac signal, an input signal is formed from the detected cardiac signal and supplied to an analysis unit. The analysis unit forms an analysis signal from the input signal, having a real part substantially corresponding to the input signal and an imaginary part that is a predetermined transformation of the input signal. A calculation unit operates on the analysis signal to calculated at least two heart-related parameters therefrom. The heart-related parameters are supplied to a processing unit that combines the heart-related parameters in a predetermined manner for identifying a cardiac condition.
72 Citations
33 Claims
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1. An implantable device for determining a cardiac condition comprising:
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a detector adapted to substantially continuously detect a heart-related signal not limited by a cardiac cycle and for forming an input signal therefrom; an analysis unit connected to said detector and receiving said input signal therefrom, and producing a continuous analysis signal from said input signal having a real part substantially corresponding to said input signal and an imaginary part formed as a predetermined transformation of said input signal; a calculation unit connected to said analysis unit and receiving said analysis signal therefrom, said calculation unit calculating at least two heart-related parameters from said analysis signal dependent on said real part and said imaginary part; and a processing unit connected to said calculation unit and supplied with said heart-related parameters therefrom, said processing unit combining said heart-related parameters in a predetermined manner and identifying a cardiac condition therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An implantable cardiac therapy device comprising:
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a cardiac condition determining device comprising a detector adapted to substantially continuously detect a heart-related signal not limited by a cardiac cycle and forming an input signal therefrom, an analysis unit connected to said detector and receiving said input signal therefrom, and producing a continuous analysis signal from said input signal having a real part substantially corresponding to said input signal and an imaginary part formed as a predetermined transformation of said input signal, a calculation unit connected to said analysis unit and receiving said analysis signal therefrom, said calculation unit calculating at least two heart-related parameters from said analysis signal dependent on said real part and said imaginary part, and a processing unit connected to said calculation unit and supplied with said heart-related parameters therefrom, said processing unit combining said heart-related parameters in a predetermined manner and identifying a cardiac condition therefrom; and a therapy administering unit connected to said cardiac condition determining device and adapted to deliver a selected cardiac therapy dependent on said cardiac condition.
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19. A method for determining a cardiac condition comprising the steps of:
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substantially continuously detecting a heart-related signal in vivo and for forming an input signal therefrom; electronically producing a continuous analysis signal from said input signal having a real part substantially corresponding to said input signal and an imaginary part formed as a predetermined transformation of said input signal; electronically calculating at least two heart-related parameters from said analysis signal dependent on said real part and said imaginary part; and electronically combining said heart-related parameters in a predetermined manner for identifying a cardiac condition. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An implantable device for determining a cardiac condition comprising:
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a detector adapted to detect a right ventricular pressure signal from a heart and for forming an input signal therefrom; an analysis unit connected to said detector and receiving said input signal therefrom, and producing an analysis signal from said input signal having a real part substantially corresponding to said input signal and an imaginary part formed as an at least approximate Hilbert transformation of said input signal; a calculation unit connected to said analysis unit and receiving said analysis signal therefrom, said calculation unit calculating at least two heart-related parameters from said analysis signal dependent on said real part and said imaginary part; and a processing unit connected to said calculation unit and supplied with said heart-related parameters therefrom, said processing unit combining said heart-related parameters in a predetermined manner and identifying a cardiac condition of the heart therefrom selected from the group consisting of actual fibrillation and ventricular fibrillation.
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32. An implantable cardiac therapy device comprising:
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a cardiac condition determining device comprising a detector adapted to detect a right ventricular pressure signal from a heart and and forming an input signal therefrom, an analysis unit connected to said detector and receiving said input signal therefrom, and producing an analysis signal from said input signal having a real part substantially corresponding to said input signal and an imaginary part formed as an at least approximate Hilbert—
transformation of said input signal, a calculation unit connected to said analysis unit and receiving said analysis signal therefrom, said calculation unit calculating at least two heart-related parameters from said analysis signal dependent on said real part and said imaginary part, and a processing unit connected to said calculation unit and supplied with said heart-related parameters therefrom, said processing unit combining said heart-related parameters in a predetermined manner and identifying a cardiac condition of the heart therefrom selected from the group consisting of atrial fibrillation and ventricular fibrillation; anda therapy administering unit connected to said cardiac condition determining device and adapted to deliver a selected cardiac therapy dependent on said defibrillation condition.
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33. A method for determining a cardiac condition comprising the steps of:
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detecting a right ventricular pressure signal in vivo and for forming an input signal therefrom; electronically producing an analysis signal from said input signal having a real part substantially corresponding to said input signal and an imaginary part formed as an at least approximate Hilbert transformation of said input signal; electronically calculating at least two heart-related parameters from said analysis signal dependent on said real part and said imaginary part; and electronically combining said heart-related parameters in a predetermined manner and identifying a cardiac condition of the heart therefrom selected from the group consisting of atrial fibrillation and ventricular fibrillation.
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Specification