Tonometer air pulse generator

Details Tonometer air pulse generator Tonometer air pulse generator

1996-06-10

1998-07-14

Bahr, Jennifer

Surgery

Diagnostic testing

Testing aqueous humor pressure or related condition

600401, 600405, A61B 316

Patent

active

057796335

ABSTRACT:
An air pulse generator for a non-contact tonometer comprises a bi-directional linear motor drivably connected to a compression mechanism and responsive to an applanation signal for reducing unnecessary air pulse energy delivered to an eye. Upon receiving the applanation signal from an applanation detector, a motor controller reverses current flow in the coil of the motor to create a reverse electromagnetic force to stop generation of the air pulse. In a first embodiment, the linear motor includes a moving permanent magnet armature for reversibly driving the compression mechanism, while in a second embodiment, the linear motor includes a moving coil for reversibly driving the compression mechanism.

REFERENCES:
patent: 4770181 (1988-09-01), Tomoda
patent: 4817620 (1989-04-01), Katsuragi et al.
patent: 5048526 (1991-09-01), Tomoda
patent: 5165408 (1992-11-01), Tomoda
patent: 5279300 (1994-01-01), Miwa et al.

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