Electronic blood pressure device
First Claim
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1. In a blood pressure measuring and recording device:
- an inflatable cuff, a crystal transducer positioned in the cuff and responsive to blood pressure pulses and cuff pressure to produce a voltage waveform having positive and negative pulses, a gage pressure transducer operably connected to the cuff, a first digital display for systolic blood pressure and a second digital display for diastolic blood pressure, means including an analog to digital converter operably connecting the gage pressure transducer to the two digital displays, means including a first comparator for producing a first signal when the amplitudes of the positive voltage pulses reach a predetermined level, means including an inverter and a second comparator for producing a second signal when the amplitudes of the negative voltage pulses reach a predetermined level, and means responsive to the presence or absence of said first and second signals for determining and recording the patient'"'"'s blood pressure, said last-named means including a voltage source having two sets of voltage levels, means operably connecting the voltage source with an input of each of the first and second comparators, one set of the voltages being fed into the comparators for determining systolic blood pressure and the other set of voltages being fed into the comparators for determining diastolic blood pressure, and means coacting with the voltage source for shifting from one set of voltages to the other.
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Abstract
A blood pressure measuring and recording device that utilizes a piezoelectric crystal transducer for sensing the pressure of the blood in the brachial artery. The transducer is positioned in the cuff in an unrestricted manner whereby it in effect "floats". The cuff pressure and blood pressure coact to cause the crystal transducer to produce a waveform in which the relationship of the amplitudes of the positive and negative pulses indicate the systolic and diastolic pressures. Means are provided in the circuitry of the device for accurately distinguishing blood pressure pulses from spurious signals.
14 Citations
1 Claim
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1. In a blood pressure measuring and recording device:
- an inflatable cuff, a crystal transducer positioned in the cuff and responsive to blood pressure pulses and cuff pressure to produce a voltage waveform having positive and negative pulses, a gage pressure transducer operably connected to the cuff, a first digital display for systolic blood pressure and a second digital display for diastolic blood pressure, means including an analog to digital converter operably connecting the gage pressure transducer to the two digital displays, means including a first comparator for producing a first signal when the amplitudes of the positive voltage pulses reach a predetermined level, means including an inverter and a second comparator for producing a second signal when the amplitudes of the negative voltage pulses reach a predetermined level, and means responsive to the presence or absence of said first and second signals for determining and recording the patient'"'"'s blood pressure, said last-named means including a voltage source having two sets of voltage levels, means operably connecting the voltage source with an input of each of the first and second comparators, one set of the voltages being fed into the comparators for determining systolic blood pressure and the other set of voltages being fed into the comparators for determining diastolic blood pressure, and means coacting with the voltage source for shifting from one set of voltages to the other.
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Current AssigneeWelch Allyn Incorporated
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Original AssigneeWelch Allyn Incorporated
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InventorsLia, Raymond A., Danna, Dominick
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Primary Examiner(s)Jaworski, Francis J.
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Application NumberUS06/032,143Time in Patent Office722 DaysField of Search128/680-683US Class Current600/493CPC Class CodesA61B 5/02116 of pulse wave amplitude A61...A61B 5/022 by applying pressure to clo...
