David J Dewey

US Patent:

47504897, Jun 14, 1988

Filed:

Aug 29, 1985

Appl. No.:

6/770528

Inventors:

John W. Berkman - Costa Mesa CA
Michael H. Curtis - El Toro CA
David A. Dewey - Huntington Beach CA

Assignee:

CooperVision, Inc. - Menlo Park CA

International Classification:

A61B 1732
A61F 1732

US Classification:

128314

Abstract:

A radial keratotomy knife which includes an accurate linear position transducer for digitally displaying the extension of a surgical blade beyond a footplate on the knife. A system is also disclosed for zeroing the blade position relative to the footplate. The system includes a zeroing sleeve having a reflective membrane to reflect light to a detector. The knife is inserted into the sleeve so that the footplate is in contact with the membrane within the system contained within a console. When the blade is advanced to contact the reflective membrane from within the sleeve, the reflected light pattern is altered to establish accurately a zero position of the knife blade relative to the footplate. The knife is then withdrawn from the sleeve and the blade advanced by a micrometer so that the transducer produces a signal relative to the reference level indicating the extension of the blade.

US Patent:

46869921, Aug 18, 1987

Filed:

May 3, 1985

Appl. No.:

6/729985

Inventors:

David A. Dewey - Huntington Beach CA
Paul C. Pynckel - Santa Ana CA

Assignee:

CooperVision, Inc. - Palo Alto CA

International Classification:

A61B 1736
G02B 718

US Classification:

1283031

Abstract:

A micromanipulator for an instrument for focusing a beam of light on a target, such as a laser in an ophthalmic instrument, includes a control member coupled through a spherical bearing located at a pivot location to a coiled spring connected to a control rod for manipulating the focus of a gimballed beamsplitter in the x and y directions. The components are structured and arranged to lie on an axis in the neutral position so that the movement of the light beam, during focusing, corresponds directly to the direction of movement of the control member by an operator. The coiled spring acts as an automatic centering device to return the focused light beam to a predetermined position in the absence of manipulation.

US Patent:

46284168, Dec 9, 1986

Filed:

May 3, 1985

Appl. No.:

6/729983

Inventors:

David A. Dewey - Huntington Beach CA

Assignee:

CooperVision, Inc. - Menlo Park CA

International Classification:

F21V 704
A61B 1736

US Classification:

362 32

Abstract:

A variable spot size illuminator for projecting a variable size spot of light into an illumination plane comprises a source of light, fiberoptic image transmission means having an entrance surface and an exit surface, means for projecting a cone of said light onto said entrance surface, objective lens means for focusing light emerging from said exit surface into said illumination plane, and means for varying the distance between said entrance surface and the vertex of said cone of light. The variable spot size illuminator is useful for projecting a spot of variable size with constant beam convergence in a laser photocoagulator.

US Patent:

20210220170, Jul 22, 2021

Filed:

Apr 1, 2021

Appl. No.:

17/220877

Inventors:

- Santa Ana CA, US
David A. Dewey - Santa Ana CA, US
Javier G. Gonzalez - Palo Alto CA, US
Alexander Vankov - Mountain View CA, US

International Classification:

A61F 9/008
A61B 3/14
A61B 34/00

Abstract:

A laser surgical method for performing a corneal incision while maintaining iris exposure below a predetermined exposure limit includes: determining an initial iris exposure based on an initial treatment scan, determining whether the initial iris exposure is less than the predetermined exposure limit; generating a revised treatment scan comprising one or more treatment scan modifying elements when the initial iris exposure is greater than the predetermined exposure limit, and scanning the focal zone of a pulsed laser beam according to the revised treatment scan, thereby performing the corneal incision, wherein the one or more treatment scan modifying elements causes the iris exposure to be smaller than the predetermined exposure limit.