Method for measuring central venous pressure or respiratory effort
First Claim
1. A non-invasive system for measuring central venous pressure, the system comprising:
- a photoplethysmography sensor and a pressure sensor adapted to be placed on a patient'"'"'s skin;
wherein the photoplethysmography sensor generates a photoplethysmography signal, and the pressure sensor generates a pressure signal which comprises an element for determining central venous pressure informationa motion sensor which generates a motion signal comprising an indication of one or more changes in a position of the patient; and
an acquisition signal processing quantification module in communication with the photoplethysmography sensor, the pressure sensor, and the motion sensor and configured tofilter the photoplethysmography signal, anduse the photoplethysmography signal, the pressure signal, and the motion signal to determine a measurement of respiration, the measurement of respiration relating to central venous pressure.
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Accused Products
Abstract
Photoplethysmography (PPG) is obtained using one red (e.g., 660 nm) and one infrared (e.g., 880 to 940 nm) light emitting diode with a single photo diode in combination with a pressure transducer thereby allowing both CVP and SpO2 to be measured simultaneously. The system also includes sensors capable of measuring position, angle and/or movement of the sensor or patient. Once the PPG signal is acquired, high pass adaptive and/or notch filtering can be used with one element of the filter from the red and infrared signals used to measure the arterial changes needed to compute SpO2 and the other element of the signal can be used to measure CVP changes.
22 Citations
14 Claims
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1. A non-invasive system for measuring central venous pressure, the system comprising:
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a photoplethysmography sensor and a pressure sensor adapted to be placed on a patient'"'"'s skin; wherein the photoplethysmography sensor generates a photoplethysmography signal, and the pressure sensor generates a pressure signal which comprises an element for determining central venous pressure information a motion sensor which generates a motion signal comprising an indication of one or more changes in a position of the patient; and an acquisition signal processing quantification module in communication with the photoplethysmography sensor, the pressure sensor, and the motion sensor and configured to filter the photoplethysmography signal, and use the photoplethysmography signal, the pressure signal, and the motion signal to determine a measurement of respiration, the measurement of respiration relating to central venous pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A non-invasive system for measuring central venous pressure, the system comprising:
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a photoplethysmography sensor and a pressure sensor adapted to be placed on a patient'"'"'s skin; wherein the photoplethysmography sensor generates a photoplethysmography signal, and the pressure sensor generates a pressure signal which comprises an element for determining central venous pressure information; a motion sensor which generates a motion signal comprising an indication of one or more changes in a position of the patient; a position sensor which generates a position signal comprising one or more positions of the patient; and an acquisition signal processing quantification module in communication with the photoplethysmography sensor and the motion sensor and configured to filter the photoplethysmography signal, and use the photoplethysmography signal, the pressure signal, and the motion signal to determine a measurement of respiration, the measurement of respiration relating to central venous pressure.
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14. A non-invasive system for measuring central venous pressure, the system comprising:
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a photoplethysmography sensor and a pressure sensor adapted to be placed on a patient'"'"'s skin; wherein the photoplethysmography sensor generates a photoplethysmography signal, and the pressure sensor generates a pressure signal which comprises an element for determining central venous pressure information; an accelerometer which generates one or more accelerometer signals comprising indications of the position, angle and movement of the patient; and an acquisition signal processing quantification module in communication with the photoplethysmography sensor and the motion sensor and configured to filter the photoplethysmography signal, and use the photoplethysmography signal, the pressure signal, and the motion signal to determine a measurement of respiration, the measurement of respiration relating to central venous pressure.
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Specification