05165415 is referenced by 31 patents and cites 15 patents.

Disclosed is a completely portable, hand-held digital ultrasonic instrument about the size and shape of an ordinary pen. The housing is contoured such that it can be easily grasped in the manner of a writing pen. An activation button is located on the interior dorsal surface in close approximation to the index fingertip of the user. A liquid crystal display provides a digital readout of a thickness measurement on the barrel of the instrument housing. The instrument incorporates a 10 MHz or 20 MHz solid phase piezoelectric transducer, a microprocessor, a gate array, a hybrid analog circuit, a liquid crystal display, batteries and a removable battery cover. The 20 MHz transducer is used to measure corneal thickness and is attached to a swan neck connector which is attached to the instrument housing. The 10 MHz transducer is used for measuring axial length and it is attached to a truncated conical connector which is also attached to the instrument housing. In addition, a pinjack connector is available to link the unit to other electronic media such as a microcomputer, personal computer, or printer.

Title
Self contained hand held ultrasonic instrument for ophthalmic use
Application Number
781148
Publication Number
5165415
Application Date
March 30, 1992
Publication Date
November 24, 1992
Inventor
Steven E Feldon
San Marino
CA, US
David A Wallace
Beverly Hills
CA, US
Agent
Lyon & Lyon
Assignee
Bio Rad Laboratories
MA, US
IPC
A61B 8/10
View Original Source