Interface between vital-signs sensors and patient monitor
First Claim
1. Apparatus for correcting a measured value from a sensor coupled to a patient, comprising:
- at least one sensor, which is configured to be coupled to a body of the patient so as to measure a physiological parameter of the body;
a patient monitor having a two leads connector for measuring the physiological parameter by applying an internal monitor voltage or an internal monitor current through the patient monitor'"'"'s connector to the sensor;
an active conversion unit, which is coupled between the at least one sensor and the patient monitor connector;
the active conversion unit is configured to determine at least the internal monitor voltage or the internal monitor current by connecting at least one known resistance, and measuring corresponding voltage or current across the two lead connector;
the active conversion unit further determines a new auxiliary signal based on the determined internal monitor voltage or the internal monitor current, and determines a corrected value; and
wherein, the active conversion unit applies the new auxiliary signal to the patient monitor through the two lead connector, the active conversion unit actively causes the patient monitor to display the corrected value of the physiological parameter instead of displaying the measured value of the physiological parameter measured by the at least one sensor.
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Accused Products
Abstract
An apparatus includes at least one sensor, a connector and a conversion unit. The sensor is coupled to a patient body so as to measure a physiological parameter of the body. The connector coupled to a patient monitor, which measures a value of the physiological parameter by applying a test signal via the connector and measuring a response signal on the connector in response to the test signal. The conversion unit is coupled between the at least one sensor and the connector, and is configured to determine a corrected value of the physiological parameter, to calculate an auxiliary signal that, in combination with the test signal produced by the patient monitor, causes the response signal on the connector to represent the corrected value of the physiological parameter, and to generate and output the auxiliary signal to the connector so as to cause the patient monitor to measure the corrected value.
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Citations
20 Claims
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1. Apparatus for correcting a measured value from a sensor coupled to a patient, comprising:
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at least one sensor, which is configured to be coupled to a body of the patient so as to measure a physiological parameter of the body; a patient monitor having a two leads connector for measuring the physiological parameter by applying an internal monitor voltage or an internal monitor current through the patient monitor'"'"'s connector to the sensor; an active conversion unit, which is coupled between the at least one sensor and the patient monitor connector; the active conversion unit is configured to determine at least the internal monitor voltage or the internal monitor current by connecting at least one known resistance, and measuring corresponding voltage or current across the two lead connector; the active conversion unit further determines a new auxiliary signal based on the determined internal monitor voltage or the internal monitor current, and determines a corrected value; and wherein, the active conversion unit applies the new auxiliary signal to the patient monitor through the two lead connector, the active conversion unit actively causes the patient monitor to display the corrected value of the physiological parameter instead of displaying the measured value of the physiological parameter measured by the at least one sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for correcting a measured value from a sensor on a patient, comprising:
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applying an internal monitor voltage or an internal monitor current through a patient monitor'"'"'s two leads connector to at least one sensor; calibrating a relation between a test signal and a response signal both from the patient monitor, wherein calibrating the relation comprises connecting multiple known resistances, and measuring respective response signals or test signals corresponding to the respective known resistances; receiving a measurement of a physiological parameter of the patient from the at least one sensor that measures a measured value of the physiological parameter; determining digitally through an active conversion unit a corrected value of the measured value; calculating a new auxiliary signal that is produced by the active conversion unit; and generating the new auxiliary signal based on the calibrated relation and applying the new auxiliary signal to a patient monitor through the patient monitor'"'"'s two lead connector, the active conversion unit actively causing the patient monitor to display the corrected value of the physical parameter instead of the measured value of the physiological parameter measured by the at least one sensor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification