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System and method of determining whether to recalibrate a blood pressure monitor
| Details |
Inventors: Caro, Richard G.; Sher, Mark H.;
Assignee: Masimo Corporation (Irvine, CA)
Primary Examiner: Nasser; Robert L.
Assistant Examiner:
Attorney, Agent or Firm: Knobbe, Martens, Olson & Bear, LLP
A monitor for determining a patient's physiological parameter includes a calibration device configured to provide a calibration signal representative of the patient's physiological parameter. An exciter is positioned over a blood vessel of the patient for inducing a transmitted exciter waveform into the patient. A noninvasive sensor is positioned over the blood vessel, where the noninvasive sensor is configured to sense a hemoparameter and to generate a noninvasive sensor signal representative of the hemoparameter containing a component of a received exciter waveform. In this context, a hemoparameter is defined as any physiological parameter related to vessel blood such as pressure, flow, volume, velocity, blood vessel wall motion, blood vessel wall position and other related parameters. A processor is configured to determine a relationship between a property of the received exciter waveform and a property of the physiological parameter. The processor is connected to receive the calibration signal and the noninvasive sensor signal, and the processor is configured to process the calibration signal and the noninvasive sensor signal to determine the physiological parameter. In the preferred embodiment, the physiological parameter measured is blood pressure, however, the present invention can also be used to analyze and track other physiological parameters such as vascular wall compliance, strength of ventricular contractions, vascular resistance, fluid volume, cardiac output, myocardial contractility and other related parameters. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment concentrates on the physiological parameter of blood pressure, however, many additional physiological parameters can be measured with the present invention including vascular wall compliance, ventricular contractions, vascular resistance, fluid volume, cardiac output, myocardial contractility and other related parameters.
Those skilled in the art will appreciate that various changes and modifications can be made to the preferred embodiment while remaining within the scope of the present invention.
As used herein, the term continuous means that the physiological parameter of interest is determined over a period of time, such as during the course of surgery.
The implementation of portions of the invention in a digital computer is performed by sampling various input signals and performing the described procedures on a set of samples.
Hence, a periodic determination of the physiological parameter of interest is within the definition of the term continuous.
FIG.
1 illustrates the components and configuration of the preferred embodiment.
Oscillometric cuff 110 is connected to processor 100 via wire 106, and cuff 110 is responsive to processor 100 during an initial calibration step.
Oscillometric cuff operation, which is known in the art, involves an automated procedure for obtaining a blood pressure signal.
The general procedure is given for clarity but is not crucial to the invention.
First, an occlusive cuff is pressurized around the patient's upper arm to abate the blood flow.
Then, as the pressure is slowly reduced, a transducer senses when the blood flow begins and this pressure is recorded as the systolic pressure.
As the pressure is further reduced, the transducer similarly detects the pressure when full blood flow is restored and this pressure is recorded as the diastolic pressure.
The signals representing pressure are delivered, via wire 106, to processor 100 for storage.
An alternative blood pressure measurement technique such as manual or automated sphygmomanometry using Korotkoff sounds or "return to flow" techniques, could also be used
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Communications 
