Arterial pressure measuring apparatus
First Claim
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1. A non-invasive arterial pressure measuring apparatus for detecting arterial pressure, comprising:
- systolic pressure value Pas measuring means including a cuff adapted to be applied to a limb of a body having arterial pressure for inflation of the cuff to raise the internal pressure therein to a value above the systolic arterial pressure of the body whose arterial pressure is to be measured by the systolic pressure value Pas and for gradually reducing the pressure to the systolic pressure;
sequence control means coupled with said cuff for measuring the output thereof at a highest arterial pressure value Pas and responsive to said cuff output for storing the highest amplitude output while discarding previous lower amplitude outputs and non-storing of subsequent lower amplitude outputs to obtain and provide a mean arterial pressure value Pam; and
means coupled with said cuff and responsive thereto for determining the lowest arterial pressure value Pad.
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Abstract
An arterial pressure measuring apparatus which comprises in combination a cuff adapted to be applied to a portion a human body where arterial pressure is measured, a light emitting diode, a phototransistor, a transducer, a pump for the control of the cuff, a control unit for the pump, a transducer for measuring the pressure of the cuff, a current control circuit for the light emitting diode, a DC amplifier circuit, an AC amplifier circuit for the output of the phototransistor and an operation circuit.
24 Citations
20 Claims
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1. A non-invasive arterial pressure measuring apparatus for detecting arterial pressure, comprising:
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systolic pressure value Pas measuring means including a cuff adapted to be applied to a limb of a body having arterial pressure for inflation of the cuff to raise the internal pressure therein to a value above the systolic arterial pressure of the body whose arterial pressure is to be measured by the systolic pressure value Pas and for gradually reducing the pressure to the systolic pressure; sequence control means coupled with said cuff for measuring the output thereof at a highest arterial pressure value Pas and responsive to said cuff output for storing the highest amplitude output while discarding previous lower amplitude outputs and non-storing of subsequent lower amplitude outputs to obtain and provide a mean arterial pressure value Pam; and means coupled with said cuff and responsive thereto for determining the lowest arterial pressure value Pad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-invasive method for measuring arterial pressure, comprising the steps of:
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raising the internal pressure within a cuff applied to a human or other animal above the systolic arterial pressure thereof whose arterial pressure is to be measured; obtaining more than one arterial pressure and selecting the highest arterial pressure value Pas in a central processing unit; obtaining the output wave form of an arterial pressure pulse wave detection sensor corresponding to one heart beat and enlarging the waveform; and measuring the highest and lowest amplitude values from a predetermined reference level as highest value Pas and lowest value Pad. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. Apparatus for measuring arterial pressure in human fingers, comprising:
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a cuff for placement over the finger; light emitting means within said cuff proximate to the finger, and light receiving means within said cuff proximate to the finger; first transducer means for measuring arterial pressure directly; pump means for controlling said cuff and means for controlling said pump means; second transducer means coupled to said cuff for measuring pressure therein; current control circuit means for said light emitting means coupled thereto; DC amplifier circuit means and AC amplifier circuit means coupled to the output of said light receiving means; and operation circuit means coupled to the outputs of both said DC amplifier circuit means and said AC amplifier circuit means for producing an output characteristic of the ratio of the output of said AC amplifier circuit means to that of said DC amplifier circuit means, said ratio increasing and decreasing as the cuff pressure increases or decreases, respectively.
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Specification