Implantable intravascular pressure determining device and method
First Claim
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1. An implantable intravascular pressure determining device comprising:
- a pressure sensor adapted for placement in a vascular system of a subject for generating a raw pressure signal;
an acceleration sensor, separate from said pressure sensor, adapted for measuring acceleration associated with said subject and for generating an acceleration signal corresponding to the measured acceleration, said acceleration signal being separate from said raw pressure signal;
an evaluation unit supplied with said raw pressure signal and said acceleration signal for identifying time intervals, in which said measured acceleration is below a predetermined threshold, and for generating, a control signal in said time intervals said evaluation unit identifying a maximum signal strength of said acceleration signal, and setting said predetermined threshold to a predetermined fraction of said maximum signal strength; and
a processor supplied with said raw pressure signal and said control signal for processing said raw pressure signal, to generate a processed signal corresponding to intravascular pressure, only in the time intervals represented by said control signal.
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Abstract
In an implantable intravascular pressure determining device and method, a pressure sensor generates a raw pressure signal and an acceleration sensor measures acceleration in a patient. Time intervals are identified wherein the raw pressure signal accurately represents the intravascular pressure, these intervals being identified as the time intervals wherein the measured acceleration is below a predetermined threshold. The raw pressure signal is processed, to generate a processed signal which is used as an intravascular pressure signal, only in the aforementioned time intervals.
45 Citations
16 Claims
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1. An implantable intravascular pressure determining device comprising:
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a pressure sensor adapted for placement in a vascular system of a subject for generating a raw pressure signal;
an acceleration sensor, separate from said pressure sensor, adapted for measuring acceleration associated with said subject and for generating an acceleration signal corresponding to the measured acceleration, said acceleration signal being separate from said raw pressure signal;
an evaluation unit supplied with said raw pressure signal and said acceleration signal for identifying time intervals, in which said measured acceleration is below a predetermined threshold, and for generating, a control signal in said time intervals said evaluation unit identifying a maximum signal strength of said acceleration signal, and setting said predetermined threshold to a predetermined fraction of said maximum signal strength; and
a processor supplied with said raw pressure signal and said control signal for processing said raw pressure signal, to generate a processed signal corresponding to intravascular pressure, only in the time intervals represented by said control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining intravascular pressure, comprising the steps of:
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placing a pressure sensor in a vascular system of a subject and generating a raw pressure signal therewith;
placing an acceleration sensor, separate from said pressure sensor, in interacting relation with said subject and generating an acceleration signal representing acceleration experience by said subject, said acceleration signal being separate from said raw pressure signal;
identifying time intervals in which said raw signal accurately represents intravascular pressure, in which time intervals said acceleration signal is below a predetermined threshold;
identifying a maximum signal strength of said acceleration signal and setting said predetermined threshold as a predetermined fraction of said maximum signal strength; and
processing said raw pressure signal only in said time intervals to generate a processed signal corresponding to said intravascular pressure in said time intervals. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification