Wireless cardiac pulsatility sensing
First Claim
1. A method, comprising:
- delivering a non-stimulating electrical current using a first dipole located along a first body location and comprising a first electrode and a second electrode;
measuring a voltage signal using a second dipole located at a second body location spaced apart from the first body location, the measured voltage signal corresponding to the electrical current being conducted through a portion of the patient'"'"'s body, the second dipole comprising a third electrode and a fourth electrode different than the first electrode and the second electrode;
computing a pulsatility metric in response to the measured voltage signal;
detecting a physiological condition in response to the pulsatility metric; and
sensing a physiological signal using a transducer at the first body location, wherein delivering the non-stimulating electrical current comprises wirelessly transmitting a data signal correlated to the physiological signal through the portion of the patient'"'"'s body to a processor configured to receive the data signal.
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Accused Products
Abstract
An implantable medical device system and associated method monitor changes in transimpedance in a body tissue due to changes in cardiac pulsatility. A first dipole is used to deliver a non-stimulating electrical current. The first dipole includes a first electrode and a second electrode adapted to be deployed along a first body location. A second dipole is used to measure a voltage resulting from the non-stimulating electrical current being conducted through a portion of a patient'"'"'s body. The second dipole includes a third electrode and a fourth electrode different than the first electrode and the second electrode and adapted to be deployed along a second body location spaced apart from the first body location.
86 Citations
19 Claims
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1. A method, comprising:
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delivering a non-stimulating electrical current using a first dipole located along a first body location and comprising a first electrode and a second electrode; measuring a voltage signal using a second dipole located at a second body location spaced apart from the first body location, the measured voltage signal corresponding to the electrical current being conducted through a portion of the patient'"'"'s body, the second dipole comprising a third electrode and a fourth electrode different than the first electrode and the second electrode; computing a pulsatility metric in response to the measured voltage signal; detecting a physiological condition in response to the pulsatility metric; and sensing a physiological signal using a transducer at the first body location, wherein delivering the non-stimulating electrical current comprises wirelessly transmitting a data signal correlated to the physiological signal through the portion of the patient'"'"'s body to a processor configured to receive the data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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delivering a non-stimulating electrical current using a first dipole located along a first body location and comprising a first electrode and a second electrode; measuring a voltage signal using a second dipole located at a second body location spaced apart from the first body location, the measured voltage signal corresponding to the electrical current being conducted through a portion of the patient'"'"'s body, the second dipole comprising a third electrode and a fourth electrode different than the first electrode and the second electrode; computing a pulsatility metric in response to the measured voltage signal; and detecting a physiological condition in response to the pulsatility metric, wherein computing a pulsatility metric comprises; determining a peak amplitude using the measured voltage signal; computing a moving average using the measured voltage signal; and computing a ratio of the peak amplitude and the moving average.
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10. An implantable medical device system, comprising:
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a first dipole to deliver a non-stimulating electrical current, the first dipole comprising a first electrode and a second electrode adapted to be deployed along a first body location; a second dipole to measure a voltage signal resulting from the non-stimulating electrical current being conducted through a portion of a patient'"'"'s body;
the second dipole comprising a third electrode and a fourth electrode different than the first electrode and the second electrode and adapted to be deployed along a second body location spaced apart from the first body location;a processor configured to compute a pulsatility metric in response to the measured voltage signal and to detect a physiological condition in response to the pulsatility metric; a transducer sensing a physiological signal at the first body location; and a data transmission module configured to wirelessly transmit a data signal correlated to the physiological signal through the portion of the patient'"'"'s body via the first dipole, wherein the processor is configured to extract the measured voltage at the second dipole from the data signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An implantable medical device system, comprising:
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a first dipole to deliver a non-stimulating electrical current, the first dipole comprising a first electrode and a second electrode adapted to be deployed along a first body location; a second dipole to measure a voltage signal resulting from the non-stimulating electrical current being conducted through a portion of a patient'"'"'s body;
the second dipole comprising a third electrode and a fourth electrode different than the first electrode and the second electrode and adapted to be deployed along a second body location spaced apart from the first body location; anda processor configured to compute a pulsatility metric in response to the measured voltage signal and to detect a physiological condition in response to the pulsatility metric, wherein computing the pulsatility metric comprises; determining a peak amplitude using the measured voltage signal; computing a moving average using the measured voltage signal; and computing a ratio of the peak amplitude and the moving average.
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19. A computer-readable medium storing a set of instructions which cause a processor of a medical device system to:
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control the delivery of a non-stimulating electrical current using a first dipole located along a first body location and comprising a first electrode and a second electrode; measure a voltage signal using a second dipole located at a second body location spaced apart from the first body location, the voltage corresponding to the electrical current being conducted through a portion of the patient'"'"'s body, the second dipole comprising a third electrode and a fourth electrode different than the first electrode and the second electrode; compute a pulsatility metric in response to the measured voltage; detect a physiological condition in response to the pulsatility metric; and sensing a physiological signal using a transducer at the first body location, wherein delivering the non-stimulating electrical current comprises wirelessly transmitting a data signal correlated to the physiological signal through the portion of the patient'"'"'s body to a processor configured to receive the data signal.
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Specification