Kevin A Keilbach from 2975 Madera Ct, Boulder, CO 80301, age 61, Phone: (303)4405221

Us Patents

Over-Molded Reflective Optical Fiber Terminal
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US Patent:

6343177, Jan 29, 2002
Filed:

Mar 26, 1999
Appl. No.:

09/277852
Inventors:

Daniel A. Estoque - Boulder CO
Kevin A. Keilbach - Boulder CO
Assignee:

Datex-Ohmeda, Inc. - Louisville CO
International Classification:

G02B 600
US Classification:

385139, 385 73, 385 74, 385 76
Abstract:

An over molded reflective optical fiber terminal ( ) generally includes an end portion of an optical fiber ( ) that has been stripped of its buffer ( ), a terminal block ( ), an integral mirror ( ) formed on the terminal block ( ), and an optical element such as a window ( ). The terminal block ( ) is preferably formed from transparent injection molded plastic. The block can be molded so as to define a profile for the mirror ( ). By virtue of this design, construction and alignment of the terminal/mirror system is simplified and costs are reduced. In addition, the reflective surface of the mirror ( ) may be protected against dust or other optical interference. Moreover, a compact reliable terminal system for off axis application is provided.

Monitoring Led Wavelength Shift In Photoplethysmography
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US Patent:

20030073889, Apr 17, 2003
Filed:

Oct 11, 2001
Appl. No.:

09/975807
Inventors:

Kevin Keilbach - Boulder CO, US
Christina Knopp - Amesbury MA, US
International Classification:

A61B005/00
US Classification:

600/322000
Abstract:

The present invention is directed to a method and system for the determination of a spectral characteristic of light signals emitted by light signal emitters of a photoplethysmographic probe to achieve improved accuracy in photoplethysmographic blood analyte level determinations. In one embodiment, a system for use in photoplethysmography includes a plurality of light signal emitters (A-D) within a photoplethysmographic probe () and a voltage sensor () and data processor () within a photoplethysmographic monitor unit () to which the probe () is connectable. The voltage sensor () is operable to sense a voltage drop across each light signal emitter (A-D) as each emits a corresponding light signal (A-D) for transmission through a tissue under test. The data processor () is operable to establish at least one spectral characteristic, such as the center wavelength, of each emitted light signal (A-D) based on the sensed voltage drops.

Intra-Operative Ocular Parameter Sensing
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US Patent:

20070191695, Aug 16, 2007
Filed:

Dec 6, 2006
Appl. No.:

11/567597
Inventors:

Daniel Abrams - Denver CO, US
Christopher Crowley - Golden CO, US
Kevin Keilbach - Boulder CO, US
International Classification:

A61B 5/00
US Classification:

600310000
Abstract:

A patient is monitored during a medical procedure, such as spinal surgery, to identify a condition indicative of the possible onset of blindness or damage to the patient's eye or eyes. Parameters that may be monitored in this regard include ocular perfusion, retinal oxygen saturation and ocular pressure. In one implementation, a device for monitoring the desired parameters includes a contact lens with fiber optic pathways mounted thereon. Light of multiple wavelengths can be transmitted into the patient's eyes via input optical pathways. Output optical pathways are associated with a camera for obtaining images of an area of interest within the patient's eyes. The images can be processed to obtain information regarding ocular perfusion and/or oxygen saturation. Changes in this regard can be used to identify a condition of interest.

Ocular Parameter Sensing For Cerebral Perfusion Monitoring And Other Applications
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US Patent:

20070270673, Nov 22, 2007
Filed:

Feb 15, 2007
Appl. No.:

11/675178
Inventors:

Daniel Abrams - Denver CO, US
Christopher Crowley - Golden CO, US
Kevin Keilbach - Boulder CO, US
International Classification:

A61B 5/00
US Classification:

600310000
Abstract:

A system and associated methodology allow for monitoring ocular parameters of a patient. Parameters that may be monitored in this regard include ocular perfusion, retinal oxygen saturation and ocular pressure. In one implementation, a device for monitoring the desired parameters includes a contact lens with fiber optic pathways mounted thereon. Light of multiple wavelengths can be transmitted into the patient's eyes via input optical pathways. Output optical pathways are associated with a camera for obtaining images of an area of interest within the patient's eyes. The images can be processed to obtain information regarding ocular perfusion and/or oxygen saturation. Changes in this regard can be used to identify a condition of interest.

System And Method For Measuring Narrow And Wide Angle Light Scatter On A High-Speed Cell Sorting Device
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US Patent:

20130169953, Jul 4, 2013
Filed:

Sep 20, 2012
Appl. No.:

13/623305
Inventors:

Michael D. Zordan - Champaign IL, US
Gary P. Durack - Urbana IL, US
Shinji Yamada - Kanagawa-ken, JP
Bharath K. Narahari - Spring Lake MN, US
Elizabeth C. Eaton - Urbana IL, US
Jeffrey D. Wallace - Mahomel IL, US
Larry W. Arnold - Snow Camp NC, US
Kevin A. Keilbach - Boulder CO, US
Assignee:

Sony Corporation of America - New York NY
Sony Corporation - Tokyo
International Classification:

G01N 21/53
G02B 5/22
G02B 5/02
G01N 21/64
US Classification:

356 72, 356343, 359885, 359599
Abstract:

The various embodiments disclosed herein utilize multiple lasers that have different wavelengths and a single detection path. The lasers are mounted orthogonal to one another so that one laser will provide a forward angle light scatter (FALS) signal in the detection path, and one laser will provide a side scatter signal in the detection path (i.e., the single detection optics are approximately in-line with the FALS laser and approximately orthogonal to the side scatter laser). The single detector path spectrally separates the forward and side scatter signals prior to applying them to their respective detectors for measurement.

System And Method For Increasing The Efficiency Of A Raman Gas Analysis System
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US Patent:

56731094, Sep 30, 1997
Filed:

Jul 10, 1996
Appl. No.:

8/678642
Inventors:

Kevin A. Keilbach - Boulder CO
Assignee:

Ohmeda Inc. - Liberty Corner NJ
International Classification:

G01J 318
G01J 344
US Classification:

356301
Abstract:

A Raman gas analysis system uses a half-wave plate to match the polarization of Raman scattered light emitted from a gas analysis cell to a preferred polarization orientation of a diffraction grating. The gas analysis system includes a plasma discharge tube for generating a polarized light beam; a gas analysis cell for containing a sample gas which produces Raman scattered light in response to being irradiated with the polarized light beam; an optical subsystem for collecting and providing the Raman scattered light with a preferred polarization orientation; a holographic diffraction grating for dispersing the Raman scattered light into component light signals; and an array detector for detecting the component light signals.

On-Airway Respiratory Gas Monitor Employing Transformed Infrared Signals
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US Patent:

59311614, Aug 3, 1999
Filed:

Mar 18, 1998
Appl. No.:

9/040558
Inventors:

Kevin A. Keilbach - Boulder CO
D. Alan Hanna - Boulder CO
Assignee:

Datex-Ohmeda, Inc. - Louisville CO
International Classification:

A61M 1600
US Classification:

12820422
Abstract:

The respiratory gas analyzer (10), in one embodiment, is used for in-stream analysis of a patient breathing circuit (12). The analyzer includes a source (12) of infrared illumination, a modulator (28) for modulating the infrared illumination on a wavelength dependent basis to yield a modulated signal, a transmitter/detector unit (32) for transmitting the modulated signal through the breathing circuit (12) and detecting the transmitted signal, and a processing unit (34) for determining composition information regarding a sample under analysis based on the detected, modulated signal. The modulator (28) may include, for example, a Michelson interferometer for transforming the illumination into a frequency domain signal. The modulated signal allows for use of a compact detector system at the respiratory circuit interface. In addition, infrared fiber optics can be utilized to minimize instrumentation/optics at the interface.

System For Monitoring Contamination Of Optical Elements In A Raman Gas Analyzer
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US Patent:

59299819, Jul 27, 1999
Filed:

Jun 18, 1996
Appl. No.:

8/665387
Inventors:

Kevin A. Keilbach - Boulder CO
Assignee:

Ohmeda Inc. - Louisville CO
International Classification:

G01N 2100
US Classification:

356 73
Abstract:

A photodetector is used to monitor contamination of optical elements within an optical system. The photodetector is aligned to detect nonspecular/diffuse reflections attributable to surface irregularities of particulate matter residing on the surfaces of the optical elements within the system. An increase in the intensity of the nonspecular reflections corresponds to increased levels of contamination on the surface of the optical element. An electronic detector circuit performs signal processing on the photodetector output signal and generates an output signal corresponding to the contamination level. In another aspect of the invention, the photodetector circuit is incorporated into a Raman gas analysis system. The invention also provides a method for detecting nonspecular reflection in an optical resonant system by generating and resonating an optical energy beam in an optical resonant cavity so as to irradiate an optical element within the cavity; detecting optical energy reflecting off the optical element; and generating an output signal functionally related to the intensity of the detected optical energy.