Human pulse rate measuring apparatus

• US 3,139,086 A
• Filed: 04/26/1962
• Issued: 06/30/1964
• Est. Priority Date: 04/26/1962
• Status: Expired due to Term

• Current Assignee: Francis W. Botsch, Michael J. Sacco
• Original Assignee: Francis W. Botsch, Michael J. Sacco
• Inventors: Botsch, Francis W., Sacco, Michael J.
• Application Number:
  US04/190,512
• Time in Patent Office: 796 Days
• US Class Current: 600/479
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence

Claims

1. A DEVICE FOR INDICATING CHANGES IN THE LIGHT TRANSMISSION CHARACTERISTICS OF TISSUE THROUGH WHICH BLOOD IS CIRCULATED COMPRISING:

(A) A TRANSDUCER COMPRISING;

(1) AN OPAQUE MEMBER HAVING AT LEAST ONE SURFACE CAPABLE OF CONTACTING ENGAGEMENT WITH AN AREA OF TISSUE THROUGH WHICH BLOOD IS CIRCULATED, SAID SURFACE HAVING APERTURES THERETHROUGH AT A POSITION TO BE COMPLETELY COVERED BY SAID AREA WHEN SAID SURFACE IS BROUGHT INTO CONTACTING ENGAGEMENT THEREWITH, (2) A SOURCE OF LIGHT LOCATED TO DIRECT LIGHT RAYS AXIALLY THROUGH AT LEAST ONE OF SAID APERTURES SO THAT SAID RAYS IMPINGE UPON SAID AREA WHEN SAID SURFACE IS BROUGHT INTO CONTACTING ENGAGEMENT THEREWITH, AND (3) A PHOTOELECTRIC CELL RESPONSIVE TO LIGHT RECEIVED THROUGH ANOTHER OF SAID APERTURES COVERED BY SAID AREA WHEN SAID SURFACE IS BROUGHT INTO CONTACTING ENGAGEMENT THEREWITH;

AND (B) A UTILIZATION CIRCUIT CONTROLLED BY SAID PHOTOELECTRIC CELL.