Apparatus for measuring blood pressure and heartbeat pulses

• US 3,156,237 A
• Filed: 03/08/1963
• Issued: 11/10/1964
• Est. Priority Date: 03/08/1963
• Status: Expired due to Term

• Current Assignee: Karl W. Edmark Jr
• Original Assignee: Karl W. Edmark Jr
• Inventors: Edmark, Karl W. Jr.
• Application Number:
  US04/263,932
• Time in Patent Office: 613 Days
• US Class Current: 600/496
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/0235 Valves specially adapted therefor

Claims

1. IN A BLOOD PRESSURE AND HEARTBEAT PULSE MEASURING APPARATUS, AN EXTREMITY-RECEIVING PNEUMATIC COMPRESSOR PROVIDED ON ITS INTERIOR SURFACE WITH SPACED ELECTRODES LOCATED TO MAKE ELECTRICAL CONTACT WITH TWO SPACED POINTS ON AN EXTREMITY RECEIVED WITHIN THE COMPRESSOR, MEANS TO SUPPLY FLUID UNDER PRESSURE TO SAID COMPRESSOR, PRESSURE-INDICATING MEANS CONNECTED TO SAID COMPRESSOR, IMPEDANCE-RESPONSIVE MEANS ELECTRICALLY CONNECTED TO SAID ELECTRODES SO THAT THE IMPEDANCE DEFINED BY THE PORTION OF THE EXTREMITY BETWEEN SAID TWO SPACED POINTS WILL BE ELECTRICALLY CONNECTED TO SAID IMPEDANCE-RESPONSIVE MEANS, SAID IMPEDANCE VARYING WITH THE FLOW OF BLOOD THROUGH SAID PORTION, AND MEANS VARYING THE FLUID PRESSURE IN SAID COMPRESSOR IN ACCORDANCE WITH THE RESPONSE OF SAID IMPEDANCE-RESPONSIVE MEANS.