Apparatus for measuring systolic and diastolic blood pressures

• US 3,101,082 A
• Filed: 01/31/1961
• Issued: 08/20/1963
• Est. Priority Date: 01/31/1961
• Status: Expired due to Term

• Current Assignee: Frank L. Grissman, Stephen N. Steen
• Original Assignee: Frank L. Grissman, Stephen N. Steen
• Inventors: Steen, Stephen N., Grissman, Frank L.
• Application Number:
  US04/086,097
• Time in Patent Office: 931 Days
• US Class Current: 600/493
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/0285 Measuring or recording phase velocity of blood waves
• CPC Class Codes: A61B 5/352 Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: Y10S 128/901 Suppression of noise in electric signal

Claims

1. A SPHYGMOMANOMETER COMPRISING AN INFLATABLE CUFF FOR ENCIRCLING A PORTION OF THE HUMAN BODY, MEANS FOR SELECTABLY INFLATING SAID CUFF FOR OCCLUDING AN ARTERIAL VESSEL, AN ELECTROMECHANICAL PRESSURE TRANSDUCER COUPLED TO THE PRESSURE CIRCUIT OF SAID CUFF FOR PRODUCING AN ELECTRICAL SIGNAL AS A FUNCTION OF CUFF PRESSURE, AN ELECTROMECHANICAL AUSCULTATORY TRANSDUCER FOR MONITORING THE SOUNDS OF ARTERIAL FLOW PAST THE CUFF AND PRODUCING AN ELECTRICAL SIGNAL RESPONSIVE THERETO, ELECTRODE MEANS FOR DETECTING THE ELECTRICAL POTENTIALS ASSOCIATED WITH THE CONTRACTIONS OF THE HEART MUSCLES, A COMPARISON CIRCUIT COUPLED TO BOTH SAID ELECTRODE MEANS AND SAID AUSCULTATORY TRANSDUCER FOR PRODUCING AN OUTPUT SIGNAL ONLY WHEN A SIGNAL FROM SAID AUSCULTATORY TRANSDUCER OCCURS A PREDETERMINED INTERVAL AFTER A SIGNAL FROM SAID ELECTRODE MEANS, AND INDICATING MEANS COUPLED TO BOTH SAID PRESSURE TRANSDUCER AND SAID COMPARISON CIRCUIT FOR INDICATING THE CUFF PRESSURE WHEN A SIGNAL IS PRODUCED BY THE COMPARISON CIRCUIT.