Electronic sphygmomanometer
First Claim
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1. An electronic sphygmomanometer comprising:
- an inflatable cuff;
a pressure displaying means for displaying pressure in said cuff;
a microphone attached to said cuff;
an indicating means for indicating the appearance of Korotkov sounds; and
,an indicating signal producing means for supplying indicating signals to said indicating means, including a preamplifying circuit for amplifying output signals of said microphone, a bandpass filtering circuit receiving the output of said pre-amplifying circuit and passing Korotkov sound signals, said bandpass filtering circuit having a passband with a low cutoff frequency of 40 Hz and a high cutoff frequency of 90 Hz, a detecting circuit for detecting said Korotkov sound signals, a discriminating circuit for discriminating output signals of said detecting circuit, and an amplifying circuit for amplifying the output of said discriminating circuit.
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Abstract
An electronic sphygmomanometer of simplified construction. Systolic and diastolic blood pressure are both indicated by the flashing of a light emission diode on receiving the Korotkov sound signals. A filtering circuit for passing Korotkov sound signals and eliminating pulse sound signals and other noise is used which has a passband with a low cutoff frequency of approximately 40 Hz with a sharp slope and high cutoff frequency of approximately 90 Hz with a gradual slope.
5 Citations
2 Claims
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1. An electronic sphygmomanometer comprising:
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an inflatable cuff; a pressure displaying means for displaying pressure in said cuff; a microphone attached to said cuff; an indicating means for indicating the appearance of Korotkov sounds; and
,an indicating signal producing means for supplying indicating signals to said indicating means, including a preamplifying circuit for amplifying output signals of said microphone, a bandpass filtering circuit receiving the output of said pre-amplifying circuit and passing Korotkov sound signals, said bandpass filtering circuit having a passband with a low cutoff frequency of 40 Hz and a high cutoff frequency of 90 Hz, a detecting circuit for detecting said Korotkov sound signals, a discriminating circuit for discriminating output signals of said detecting circuit, and an amplifying circuit for amplifying the output of said discriminating circuit. - View Dependent Claims (2)
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Specification
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Current AssigneeOmron Tateisi Electronics Co. (Omron Corporation)
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Original AssigneeOmron Tateisi Electronics Co. (Omron Corporation)
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InventorsYamamoto, Hideki, Kamimura, Shinobu
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Primary Examiner(s)Marlo, George J.
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Application NumberUS05/855,716Time in Patent Office756 DaysField of Search128/2.05 M, 128/2.05 S, 128/2.05 P, 128/2.05 GUS Class Current600/494CPC Class CodesA61B 5/02208 using the Korotkoff methodA61B 7/045 Detection of Korotkoff soun...
