Electro-mechanical transducer

• US 3,290,521 A
• Filed: 10/31/1963
• Issued: 12/06/1966
• Est. Priority Date: 10/31/1963
• Status: Expired due to Term

• Current Assignee: Frost Smith Jerome, George M. Coleman, Robert Ruch
• Original Assignee: Frost Smith Jerome, George M. Coleman, Robert Ruch
• Inventors: Coleman, George M., Ruch, Robert, FROST SMITH JEROME
• Application Number:
  US04/320,584
• Time in Patent Office: 1,132 Days
• US Class Current: 310/300
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 2562/164 the sensor is mounted in or on a conformable substrate or carrier
• CPC Class Codes: A61B 2562/168 Fluid filled sensor housings
• CPC Class Codes: A61B 5/1102 Ballistocardiography
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion

Claims

1. AN ELECTRO-MECHNICAL TRANSDUCER COMPRISING:

A HOLLOW TUBE, SAID HOLLOW TUBE HAVING AN INSIDE DIAMETER LESS THAN ONE MILLIMETER;

A PLURALITY OF LAYERS OF NON-WETTING CONDUCTIVE LIQUID WITHIN SAID TUBE;

A LIQUID ELECTROLYTE BETWEEN EACH OF SAID LAYERS FORMING DISTINCT SECTIONS OF ELECTROLYTE;

A PLURALITY OF CONDUCTORS, EACH PROJECTING INTO A DIFFERENT ONE OF SAID LAYERS, THE WALLS OF SAID TUBE BEING OF SOFT PLIABLE MATERIAL HAVING HIGH COMPLIANCE TO TRANSMIT PRESSURE WAVES THROUGH THE WALL TO SAID LIQUID WITHIN THE TUBE, THE HOLLOW TUBE BEING EASILY FLEXED TO ANY POSITION, WHEREBY A VOLTAGE IS GENERATED BETWEEN SAID CONDUCTORS IN RESPONSE TO DISTORTIONS OF SAID TUBE.