Blood pressure measuring equipment
First Claim
1. Blood pressure measuring equipment comprisingmeasuring means attachable to a person, said measuring means comprisinga microphone for detection of blood flow generated tones, andmeans defining a chamber deformable by a fluid,pump means for pumping fluid into said chamber for deformation thereof,valve means for controlling fluid outflow from said chamber,a pressure sensor responsive to fluid pressure in said chamber to generate an electrical signal indicative of said pressure,differentiating means electrically connected to said sensor to provide an electrical signal indicative of the rate of change in said pressure;
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Accused Products
Abstract
There is disclosed blood pressure measuring equipment comprising a sleeve with an inflatable chamber and a microphone, and an appliance connected by a line with the sleeve. The appliance comprises a pressure sensor and a differentiator connected to the sensor output. The differentiator is connected with a regulator which in operation regulates a vent valve in such a manner that the pressure in the chamber during the measurement phase, in which the systolic and diastolic pressures are measured, reduces at a constant rate. A Korotkoff tone identifier, which is connected through further elements with the microphone and the differentiator, ensures that only those signals from the microphone which occur simultaneously with a heartbeat-induced pressure fluctuation are delivered as Korotkoff tones and evaluated for determination of the systolic and diastolic pressure.
37 Citations
10 Claims
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1. Blood pressure measuring equipment comprising
measuring means attachable to a person, said measuring means comprising a microphone for detection of blood flow generated tones, and means defining a chamber deformable by a fluid, pump means for pumping fluid into said chamber for deformation thereof, valve means for controlling fluid outflow from said chamber, a pressure sensor responsive to fluid pressure in said chamber to generate an electrical signal indicative of said pressure, differentiating means electrically connected to said sensor to provide an electrical signal indicative of the rate of change in said pressure; - and
means responsive to said rate indicative signal for causing said valve means to close when said rate indicative signal represents an increase in the pressure at least during pumping of fluid into said chamber at a rate above a predetermined upper value exceeding a value normally creatable by the blood pressure of a person to which the cuff is attached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sphygmometer comprising:
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an inflatable cuff attachable to a limb; means including a microphone for detecting sounds generated by blood flow in the limb at the cuff; pump means for inflating the cuff and thereby tightening same on the limb and restricting blood flow therein; means including a vent valve connected to the cuff for deflating same; means including a pressure sensor responsive to fluid pressure in the cuff for generating an output corresponding to the pressure in the cuff; means including a differentiator connected to the sensor for determining the rate of change in the pressure in the cuff and for generating a rate signal corresponding thereto; and control means connected to the differentiator and to the vent valve and responsive to the rate signal at least during inflation of the cuff for closing the vent valve when the rate signal exceeds a predetermined limit exceeding a signal level creatable by the blood pressure in the limb to which the cuff is attached.
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Specification