A blood pressure monitor, particularly of the type having an inflatable cuff communicating with a pressure sensor and suitable for home use, may be calibrated by applying a sealed canister containing gas at a known pressure to a port so as to apply the known pressure to the pressure sensor, and comparing a pressure signal from the pressure sensor with the known pressure so as to determine a calibration error of the sensor and/or adjust the calibration of the sensor, e.g. by electronically adjusting the sensor. Several canisters may be used to calibrate the sensor across a range of pressures, each canister having a different known pressure. Each canister is preferably ruptured when attached to the port and is not re-usable, and may comprise an identifier such as an electronically readable identifier which is stored in a memory in association with the value of the known pressure within the canister. Temperature sensing means may be provided whereby the pressure reading is adjusted to compensate for temperature, e.g. of the gas released from the canister. The monitor may comprise means for sensing mechanical shock and alerting a user or remote monitoring personnel to provide an indication that recalibration is required.

Blood pressure monitor calibration

An output signal device and method that provides the operator force feedback similar to a pilot control joystick. These force feedback regions include free play, dead-band start of modulation, modulation, fore-warning bumper and hold near max angle. This output signal device may also vary the fore-warning feel and hold positions to be at any angle. This output signal device uses force sensing as the signal and has force slope changes used as auto-calibration of the output signal. This improves signal accuracy and provides a service prognostic signal. The prognostic signal may be used to activate redundant sensor. The variable force feedback may improve operation on rough terrain. The force feedback, may allow more productive operating positions to be learned. This enables productivity and other important job site criteria such as fuel usage to be optimized by interactive communication with this output signal device.

Operator controlled electrical output signal device with variable feel and hold feedback and automated calibration and learnable performance optimization

The present invention relates to a difference value comparison technique-based capacitive pressure sensor fault diagnosis system and method The system includes a capacitive pressure sensor, a switching circuit, a data acquisition circuit and a microprocessor which are sequentially connected with one another, wherein the switching circuit is connected with the microprocessor The method includes the following steps that: the microprocessor controls the first cavity of the pressure sensor to connect the acquisition circuit and the second cavity of the pressure sensor to connect the acquisition circuit through the switching circuit, and acquires pressure values corresponding to the first cavity and the second cavity of the pressure sensor; and the difference value of the two cavities of the pressure sensor is calculated, and the difference value is compared with a set threshold value; and if the difference values is in the range of the threshold value, the pressure sensor is normal, otherwise, the pressure sensor malfunctions The system and method of the invention have the advantages of simple structure, stability, reliability, high practicability and real-time diagnosis, and can reduce the labor intensity of irregular detection of the pressure sensor

Difference value comparison technique-based capacitive pressure sensor fault diagnosis system and method

A method of determining a value indicative of a hemodynamic parameter of a patient includes performing a plurality of value determinations. Performing the plurality of value determinations includes determining a first value indicative of the hemodynamic parameter, determining, with a controller, a difference between the first value and a baseline associated with the first value, and replacing the baseline with the first value, in a memory of the controller, if the difference is outside of a predetermined range. The method also includes determining an estimate of the hemodynamic parameter based on acceptable values determined during the plurality of value determinations.

Configurable vital signs system

A non-invasive blood pressure (NIBP) monitor is inflated and deflated based upon an algorithm so that a patient's current heart rate may influence the target inflation pressure and the deflation rate. In this manner, if a patient's heart rate is slower than expected, the NIBP monitor may slow its deflation rate so that an appropriate number of cardiac cycles will be captured in order to maximize accuracy. Similarly, if a patient's heart rate is faster than expected, the NIBP monitor may speed its deflation rate to minimize the time of the procedure and the stress on the patient, while still capturing an appropriate number of cardiac cycles.

System and method for non-invasive blood pressure measurement

The invention relates to an automatic error detection method in pressure measurement and an electronic sphygmomanometer using the method for implementation. The method comprises the following steps that: at least two paths of pressure sensors which are respectively connected with a microprocessor by respective electronic circuits are adopted, wherein a first path pressure sensor and the electronic circuit thereof form a measurement part which is in a normally opened state, and a second path of pressure sensor and the electronic circuits thereof form a measurement part which is in a normally closed state; the measurement part which is in the normally closed state and is automatically opened in a periodical mode and the measurement part which is in the normally opened state measure the air pressure in the same inflatable component together, and carry out calculation by the microprocessor; and when the difference of the two paths of pressure measurement values is larger than a given error allowable value, a calibration prompt or alarm is provided.

Automatic error detection method in pressure measurement and electronic sphygmomanometer

This invention discloses a method for automatic error detection in pressure measurement and an electronic sphygmomanometer using the method. The electronic sphygmomanometer comprises two pressure sensing circuits connected to a MPU. The first pressure sensing circuit is normally-on in pressure measurement. The second pressure sensing circuit is normally-off in pressure measurement. Said normally-off pressure sensing circuit is periodically turned on in an automatic manner to measure the same pressure as the normally-on pressure sensing circuit is used to measure. Said MPU computes the difference between the pressures obtained from the two pressure sensing circuits. When the difference is greater than a given error limit, calibration error warning will be given.

method for automatic error detection in pressure measurement and an electronic sphygmomanometer

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Automatic error detection method in pressure measurement and electronic sphygmomanometer

method for automatic error detection in pressure measurement and an electronic sphygmomanometer