公开(公告)号：EP0222476A3

公开(公告)日：1988-11-17

申请号：EP86307391

申请日：1986-09-25

申请人： DESIGN TEAM PARTNERS

发明人： WALLACE, DAVID ,  MEZACK, GARY ,  DALLY, WILLIAM ,  FELDON, STEVEN ,  WHITING, DOUGLAS ,  KARNS, SCOTT

IPC分类号： A61B3/10 ,  A61B8/10 ,  G01S15/10 ,  G01S15/88 ,  G04F10/04 ,  A61B8/08

CPC分类号： A61B3/1005 ,  A61B8/10 ,  G01S15/101 ,  G01S15/88

公开(公告)号：EP0217642A3

公开(公告)日：1988-06-01

申请号：EP86307393

申请日：1986-09-25

申请人： DESIGN TEAM PARTNERS

发明人： Feldon, Steven ,  Mezack, Gary ,  Wallace, David ,  Monsour, Robert

IPC分类号： A61B03/16

CPC分类号： A61B3/16

摘要： Disclosed is a battery powered, hand-held self-contained electronic tonometer with a digital readout for displaying pressure in millimeters of mercury. The tonometer includes a transducer which is a solid state pressure sensitive element and which produces a voltage proportional to intraocular pressure. An electrical waveform is produced by gently bringing the transducer in contact with the cornea. The waveform is converted to a digital signal and processed by a single chip microprocessor. The baseline of a reference signal is nulled by equalizing the charges on two capacitors on the inputs of two differential amplifiers. Equalizing the differential inputs of the two amplifier stages results in a gain of zero and removes any carrier signal. Microprocessor software detects the baseline condition established by equalizing the differential inputs. The microprocessor then looks for a series of valid measurements and calculates the average intraocular pressure along with an estimate of reliability. This average value and the reliability indicator are displayed on a liquid crystal display.

公开(公告)号：EP0219988A3

公开(公告)日：1988-07-20

申请号：EP86307392

申请日：1986-09-25

申请人： DESIGN TEAM PARTNERS

发明人： Wallace, David ,  Feldon, Steven

IPC分类号： A61B08/10 ,  A61B08/08 ,  A61B03/00 ,  A61F09/00

CPC分类号： A61B8/4455 ,  A61B3/1005 ,  A61B8/0858 ,  A61B8/10 ,  A61B8/462 ,  A61F9/013

摘要： 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 the corneal thickness 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 attached to a swan neck connector which is attached to the instrument housing. When a 10 MHz transducer is used, it is attached to a truncated conical connector which is also attached to the instrument housing. In addition, a pinjack connector is avai ' able to link the unit to other electronic media such as a microcomputer, personal computer, or printer.