Hycel, Inc.

Howard Andrew Vick

Donald B Johnson

A system for simultaneously monitoring one or a plurality of patients samples each electrocardiac waveform of each patient to generate a model waveform for each patient. The image is resolved into contour intervals, e.g. PR, QR, ST and T intervals, and the system establishes a set of interval limits for each patient to which samples of subsequently monitored waveforms are compared. Errors associated with each patient are separately stored and reported by the system in an order which may correspond to a priority ranking of the seriousness of the conditions with which the errors are associated.

Apparatus and method for reporting detected error in a cardiac signal

A fail safe detector in a cardiac monitoring system provides an alarm to indicate failure of the system to respond to cardiac waveforms supplied thereto from cardiac waveform sources. A time out circuit will produce the alarm if not periodically reset by pulses produced in response to measurement of cardiac waveforms. Means are provided for sensing whether cardiac waveforms are received from the sources to provide an alternate means of triggering periodic reset signals when no waveforms are received from the sources to prevent false alarms.

Fail safe detector in a cardiac monitor

In a hematology analyzer, peaks of pulses indicative of red blood cells in a sample during a count are detected. Peak detecting means produce a gate signal connected to gate means which couple a portion of each pulse in the time vicinity of its peak to integration means. The level accumulated in the integration means is indicative of total cell volume, and hence indicative of hematocrit for a known sample volume.

Hematocrit measurement in an automatic hematology analyzer

A hematology analyzer provides a pulse signal in which the number of pulses manifests the number of blood cells in a sample volume of blood and the magnitude of each pulse manifests the size of each such blood cell. The analyzer also provides an analog voltage manifesting the hemoglobin content of the blood sample. Means responsive to the pulse signal provide an analog voltage manifesting the hematocrit of the blood sample and an analog voltage manifesting the number of cells. An analog-to-digital converter is switchably responsive to the analog hemoglobin, hematocrit and cell count signals to provide required ratios reflecting the mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concentration of the blood sample.

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Pearland, TX, United States of America

Howard Andrew Vick