Appparatus for detecting interfaces in a body
Abstract
Abstract THE POSITION OF THE SWEEP ON THE SCREEN OF A CATHODE RAY TUBE ALONG WHICH TRACES APPEAR CORRESPONDING TO INTERFACES IN A BODY DETECTED BY AN ULTRASONIC PROBE IS CONTROLLED BY VARIABLE IMPEDANCE MEANS OPERATED BY A REEL ON WHICH AN INEXTENSIBLE CORD CONNECTED TO THE PROBE IS WOUND. THE CORD IS UNWOUND AGAINST THE BIASING ACTION OF A SPRING AND EXTENDS THROUGH A GUIDE TUBE. THE VARIABLE IMPEDANCE MEANS, REEL AND GUIDE TUBE ARE MOUNTED TO PIVOT ABOUT AN AXIS PERPENDICULAR TO THE AXIS OF PIVOTAL MOVEMEBT OF THE REEL. IN ONE EMBODIMENT THE REEL IS ROTATABLE ABOUT A HORIZONTAL AXIS IN A HOUSING THAT IS ROTAT- ABLE ABOUT A VERTICAL AXIS WITH THE CORD EXTENDING RADIALLY FROM THE HOUSING. IN ANOTHER EMBODIMENT THE REEL IS ROTATABLE ABOUT A HORIZONTAL AXIS IN A STATIONARY HOUSING AND THE CORD IS WITHDRAWN THROUGH A BUSHING IN A TOP PLATE AND IN ANY GENERALLY RADIAL DIRECTION. PROVISION IS MADE FOR RELEASING THE SPRING BIASED REEL IN STEPS CORRESPONDING TO ONE COMPLETE REVOLUTION OF THE VARIABLE IMPEDANCE MEANS.
Inventors
- 👤 Stelios Regas
Bibliographic Details
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