Blood pressure monitor
First Claim
1. Apparatus for automated measurement of blood pressure by application of air pressure to a cuff in such a manner as to prevent a harmful pressure from occurring in said cuff comprisingair control means including a pump for inflating or deflating a cuff via an outlet,first and second pressure sensors adapted to be coupled to a cuff so as to respectively provide first and second signals indicative of the pressure in the cuff,means having stored calibration data for each of said pressure sensors,electronic means for activating said pump, for determining from said first and second signals and said calibration data the calibrated values of pressure for each of said sensors and for causing said air control means to deflate a cuff if either of said calibrated values exceeds a predetermined amount, andsaid electronic means having means for comparing said calibrated pressure values and for causing said air control means to deflate a cuff when they differ by more than a predetermined amount.
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Accused Products
Abstract
A monitor for the automated non-invasive measurement of a patient'"'"'s blood pressure comprising apparatus for automatically inflating and deflating a cuff which is to be applied around a patient'"'"'s extremity, first and second pressure sensors coupled to the airway of said cuff, each providing an electronic signal indicative of cuff pressure, and a processor responding to the signals obtained by said pressure sensors for stopping the inflation of the cuff when a maximum cuff pressure is reached, and for calculating the blood pressure from the oscillations of the pressure signal. A memory is connected to said processor in which calibration values indicating the pressure related to the electronic signals provided by each of said two pressure sensors are stored. The processor is adapted to access and compare those calibration values which correspond to the actual values of said electronic signals provided by said two sensors to monitor supply and/or reference voltages, and to cause the deflation of the cuff when the actual calibration values differ from each other or the supply and/or reference voltages each differ from a related predetermined value more than a predetermined amount, thus preventing any pressure raise over predetermined limits in case of any malfunction of the monitor without the use of mechanical pressure switches.
45 Citations
26 Claims
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1. Apparatus for automated measurement of blood pressure by application of air pressure to a cuff in such a manner as to prevent a harmful pressure from occurring in said cuff comprising
air control means including a pump for inflating or deflating a cuff via an outlet, first and second pressure sensors adapted to be coupled to a cuff so as to respectively provide first and second signals indicative of the pressure in the cuff, means having stored calibration data for each of said pressure sensors, electronic means for activating said pump, for determining from said first and second signals and said calibration data the calibrated values of pressure for each of said sensors and for causing said air control means to deflate a cuff if either of said calibrated values exceeds a predetermined amount, and said electronic means having means for comparing said calibrated pressure values and for causing said air control means to deflate a cuff when they differ by more than a predetermined amount.
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20. Apparatus for non invasively monitoring the blood pressure of a patient comprising:
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a cuff, means for inflating and deflating said cuff, first and second pressure sensors coupled to said cuff for providing separate signals representing the pressure in said cuff, means for monitoring said signals so as to calculate the blood pressure respectively indicated thereby and for deflating said cuff when said signals indicate a pressure that exceeds a predetermined maximum or when said signals produced in response to test pressure in said cuff represent pressures that differ by more than a predetermined amount.
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21. Apparatus for automated measurement of blood pressure by application of air pressure to a cuff in such manner as to prevent a harmful pressure from occurring in said cuff comprising:
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air control means including a pump for inflating or deflating a cuff via an outlet, first and second pressure sensors adapted to be coupled to a cuff so as to respectively provide first and second signals indicative of the pressure in the cuff, means having stored calibration data for each of said pressure sensors, a first processor means for activating said pump, for determining from said first and second signals and said calibration data the calibrated values of pressure for each of said sensors, for causing said air control means to deflate a cuff if either of said calibrated values exceeds a predetermined amount, for comparing said calibrated pressures and for causing said air control means to deflate a cuff when they differ by more than a predetermined amount, a second processor means for controlling internal and external data transfer of said first processor means, a shared memory coupled to said first and second processor means, and means for causing said air control means to deflate a cuff when there is a failure of data transfer in said shared memory indicating a failure in said first processor. - View Dependent Claims (22, 23, 24)
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25. Apparatus for automated measurement of blood pressure by application of air pressure to a cuff in such manner as to reduce the chance of harmful pressure appearing in said cuff comprising:
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air supply means for controllably supplying inflation and deflation air pressures for a blood pressure cuff, first and second pressure sensors adapted to be coupled to a blood pressure cuff for providing first and second signals in response to pressure therein, means for supplying operating and reference voltages to said sensors, and means including a first processor for monitoring said signals and said voltages and for causing said air supply means to supply a deflation pressure if (a) the pressure represented by either of said first and second signals exceeds a given maximum (b) the difference between the pressures represented by said first and second signals exceeds a given amount and (c) the difference between any of said operating and reference voltages and given respective values exceeds given respective amounts. - View Dependent Claims (26)
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Specification