Signal conditioning device for interfacing intravascular sensors having varying operational characteristics to a physiology monitor
First Claim
1. A signal conditioning device interposable between a physiology monitor and various intravascular measurement devices, the signal conditioning device facilitating establishing compatibility between the physiology monitor and the various intravascular measurement devices, the signal conditioning device comprising:
- a sensor interface circuit supplying a sensor drive signal for energizing a sensor carried by an attachable intravascular measurement device and providing a sensor measurement signal;
a processing unit for performing programmed tasks;
a physiology monitor interface including;
an input for receiving an excitation signal from the physiology monitor, and an output for transmitting an output measurement signal to the physiology monitor generated in accordance with the sensor measurement signal; and
a power supply circuit including a signal converter that energizes at least the processing unit with power supplied by the excitation signal.
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Abstract
A signal conditioning device is disclosed that interfaces a variety of sensor devices, such as guide wire-mounted pressure sensors, to physiology monitors. The signal conditioning device includes a processor for controlling sensor excitation and signal conditioning circuitry within the signal conditioning device. The processor also supplies signals to an output stage on the signal conditioning device representative of processed sensor signals received by a sensor interface of the signal conditioning device. Power for the signal conditioning device processor is supplied by an excitation signal received from a physiology monitor that drives the output stage. In addition, a temperature compensating current source provides an adjustment current to at least one of a pair of resistive sensor elements to compensate for differences between temperature change upon the pair of resistive sensor elements, thereby facilitating nullifying temperature effects upon the resistive sensor elements.
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Citations
38 Claims
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1. A signal conditioning device interposable between a physiology monitor and various intravascular measurement devices, the signal conditioning device facilitating establishing compatibility between the physiology monitor and the various intravascular measurement devices, the signal conditioning device comprising:
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a sensor interface circuit supplying a sensor drive signal for energizing a sensor carried by an attachable intravascular measurement device and providing a sensor measurement signal;
a processing unit for performing programmed tasks;
a physiology monitor interface including;
an input for receiving an excitation signal from the physiology monitor, and an output for transmitting an output measurement signal to the physiology monitor generated in accordance with the sensor measurement signal; and
a power supply circuit including a signal converter that energizes at least the processing unit with power supplied by the excitation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for taking a measurement from within a blood vessel to determine a flow characteristic within the blood vessel, the system comprising:
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a flexible elongate member having a sensor mounted thereon;
a cable electrically connecting the sensor to a signal conditioning device wherein the signal conditioning device comprises;
a sensor interface circuit supplying a sensor drive signal for energizing a sensor carried by an attachable intravascular measurement device and providing a sensor measurement signal;
a processing unit for performing programmed tasks;
a physiology monitor interface including;
an input for receiving an excitation signal from the physiology monitor, and an output for transmitting an output measurement signal to the physiology monitor generated in accordance with the sensor measurement signal; and
a power supply circuit including a signal converter that energizes at least the processing unit with power supplied by the excitation signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for assessing blood flow characteristics within a blood vessel by means of a signal conditioning device interposed between a physiology monitor and an intravascular sensor, the method comprising the steps of:
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advancing the intravascular sensor to a target site within a patient'"'"'s vasculature;
providing an excitation signal with the physiology monitor that is used to power both the intravascular sensor and the signal conditioning device, the excitation signal having a current of less than about 20 mA rms;
measuring a physiological parameter with the intravascular sensor;
processing, by the signal conditioning device, physiological parameter measurements to render a conditioned measurement signal; and
transmitting a signal to the physiology monitor that corresponds to the conditioned measurement signal. - View Dependent Claims (28, 29, 30)
determining a fractional flow reserve with a slide-rule mechanism having a first scale representing mean distal pressure and a second scale representing mean aortic pressure.
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29. The method of claim 27 wherein processing the physiological parameter measurements with the signal conditioning device comprises processing at least a portion of the measurements with a microcontroller.
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30. The method of claim 27 further comprising:
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calibrating the intravascular sensor to the signal conditioning device; and
calibrating the signal conditioning device to the physiology monitor.
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31. A signal conditioning device interposable between an intravascular measurement device having a pair of resistive sensing elements, and a physiology monitor, the signal conditioning device facilitating establishing compatibility between the physiology monitor and the intravascular measurement device, the signal conditioning device comprising:
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a sensor current source providing two separate excitation signals for independently driving the pair of resistive sensing elements of the intravascular measurement device;
a data input for receiving a temperature compensation calibration value for the intravascular measurement device; and
a variable current source providing an adjustment current to at least one of the pair of resistive sensing elements to compensate for temperature variations, wherein the adjustment current is derived from the temperature compensation calibration value. - View Dependent Claims (32, 33, 34)
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35. A signal conditioning device interposable between a physiology monitor and various intravascular measurement devices, the signal conditioning device comprising:
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a physiology monitor interface circuit having an input adapted to receive an excitation signal from the physiology monitor, and having an output adapted to transmit an output measurement signal to the physiology monitor;
a power supply circuit comprising a signal converter adapted to receive a portion of power supplied by the excitation signal;
a sensor interface circuit adapted to supply a sensor drive signal to a sensor carried by an attachable intravascular measurement device, the sensor interface circuit further adapted to provide a sensor measurement signal derived from the intravascular measurement device; and
a processing unit comprising a microcontroller, the processing unit adapted to render a digital sensor value, based upon the sensor measurement signal, and from which the output measurement signal is derived, wherein the power supply circuit is adapted to power at least the processing unit with the portion of power supplied by the excitation signal. - View Dependent Claims (36, 37, 38)
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Specification