Patents by Inventor William Shea
William Shea has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20100118269Abstract: This invention discloses an apparatus that is attached to the objective lens of a microscope to split its field of view into at least two. In one embodiment, a mirrored gonio lens is snapped to the objective of an ophthalmic surgical microscope to provide a view of the eye's anterior surface and a view of the eye's anterior chamber.Type: ApplicationFiled: October 27, 2009Publication date: May 13, 2010Applicant: CLARITY MEDICAL SYSTEMS, INC.Inventors: William Shea, Phillip Baker, Barry Linder
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Publication number: 20100110379Abstract: In one embodiment, an apparatus for optimizing vision correction procedures comprising: a narrow beam of light directed to a patient's retina; a dynamic defocus and compensation offsetting device configured to offset the defocus of a wavefront from an eye, a wavefront sensor configured to measure the local tilt of a number of subwavefronts sampled around an annular ring (the diameter of which can be dynamically changed) over the wavefront with the defocus offset; and a display device configured to display a two dimensional (2D) data points pattern in real time with each data point location representing a corresponding local tilt of the sampled subwavefronts. A proper defocus offset, not passive compensation, can reveal the predominant feature(s) of other wavefront aberration component(s), thus enabling a refractive surgeon to fine tune the vision correction procedure and minimize the remaining wavefront aberration(s) in real time.Type: ApplicationFiled: October 23, 2009Publication date: May 6, 2010Applicant: CLARITY MEDICAL SYSTEMS, INC.Inventors: YAN ZHOU, WILLIAM SHEA, BARRY LINDER, PHILLIP BAKER
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Patent number: 7623251Abstract: A geometric measurement system is adapted to precisely measure one or more surfaces of objects such as corneas, molds, contact lenses in molds, contact lenses, or other objects in a fixture. The geometric measurement system can employ one or more of three possible methods of measurement: Shack-Hartmann wavefront sensing with wavefront stitching; phase diversity sensing; and white light interferometry.Type: GrantFiled: April 9, 2007Date of Patent: November 24, 2009Assignee: AMO Wavefront Sciences, LLC.Inventors: Daniel R. Neal, Thomas Daniel Raymond, William Shea Powers
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Patent number: 7616330Abstract: A geometric measurement system is adapted to precisely measure one or more surfaces of objects such as corneas, molds, contact lenses in molds, contact lenses, or other objects in a fixture. The geometric measurement system can employ one or more of three possible methods of measurement: Shack-Hartmann wavefront sensing with wavefront stitching; phase diversity sensing; and white light interferometry.Type: GrantFiled: April 9, 2007Date of Patent: November 10, 2009Assignee: AMO Wavefront Sciences, LLPInventors: Daniel R. Neal, Thomas Daniel Raymond, William Shea Powers
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Patent number: 7583389Abstract: A geometric measurement system is adapted to precisely measure one or more surfaces of objects such as corneas, molds, contact lenses in molds, contact lenses, or other objects in a fixture. The geometric measurement system can employ one or more of three possible methods of measurement: Shack-Hartmann wavefront sensing with wavefront stitching; phase diversity sensing; and white light interferometry.Type: GrantFiled: April 9, 2007Date of Patent: September 1, 2009Assignee: Amo Wavefront Sciences, LLCInventors: Daniel R. Neal, Thomas Daniel Raymond, William Shea Powers
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Publication number: 20090211586Abstract: In one embodiment, a pliable film adapted to conform to parts of an optical examination device and provide a barrier between the eye of a patient being examined and the optical examination device.Type: ApplicationFiled: February 23, 2009Publication date: August 27, 2009Applicant: CLARITY MEDICAL SYSTEMS, INC.Inventors: William Shea, Keith Mullowney, Barry Linder, Phil Baker, Shelly Reed, Willem Crone, Yeou-Yen Cheng
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Patent number: 7499740Abstract: Low power techniques for sensing cardiac pulses in a signal from a sensor are provided. A pulse detection block senses the sensor signal and determines its signal-to-noise ratio. After comparing the signal-to-noise ratio to a threshold, the drive current of light emitting elements in the sensor is dynamically adjusted to reduce power consumption while maintaining the signal-to-noise ratio at an adequate level. The signal component of the sensor signal can be measured by identifying systolic transitions. The systolic transitions are detected using a maximum and minimum derivative averaging scheme. The moving minimum and the moving maximum are compared to the scaled sum of the moving minimum and moving maximum to identify the systolic transitions. Once the signal component has been identified, the signal component is compared to a noise component to calculate the signal-to-noise ratio.Type: GrantFiled: January 8, 2007Date of Patent: March 3, 2009Assignee: Nellcor Puritan Bennett LLCInventors: Brad Nordstrom, William Shea, Ethan Petersen
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Publication number: 20090005662Abstract: A pulse oximeter method and apparatus which provides (1) a notch filter at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.Type: ApplicationFiled: July 14, 2008Publication date: January 1, 2009Applicant: Nellcor Puritan Bennett IncInventors: Ethan Petersen, William Shea, Bradford B. Chew
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Publication number: 20080170911Abstract: This application describes apparatus (200, 6200, 8200) for laying elongate articles from a vessel (100) at sea. The apparatus comprising tensioning means (204, 6204, 8204) for controlling paying out of said articles along an axis of said tensioning means, and a structure tiltable (202, 6202, 8202) between upright and horizontal states. The apparatus is operable in a first mode, wherein the tensioning means is carried by said structure with its axis at an elevated angle and said structure for example also carries a radius controller (220, 6220, 8220) and a straightener (212, 6212, 8212), and in a second mode wherein the tensioning means is arranged with its axis substantially horizontal. The tiltable structure may be detachable from the tensioning means in the second mode, so as to assist in transferring in-line accessories overboard. Alternatively a separate A-frame may be provided for that purpose.Type: ApplicationFiled: March 29, 2005Publication date: July 17, 2008Inventors: Matthew Trevor Snowdon, Michael William Shea
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Patent number: 7400919Abstract: A pulse oximeter method and apparatus which provides (1) a notch filter at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.Type: GrantFiled: July 28, 2006Date of Patent: July 15, 2008Assignee: Nellcor Puritan Bennett LLCInventors: Ethan Petersen, William Shea, Bradford B. Chew
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Patent number: 7373192Abstract: A pulse oximeter with drive lines for driving red and IR LEDs, and a drive circuit for driving those drive lines. A processor controls the drive circuit using a red zero output line and an IR zero output line directly connected between the processor and the drive circuit. This allows a control signal to directly control the turning off of either the red or IR drive transistors to prevent forward current flow through the red and IR LEDs by overriding the ongoing programmable logic state machine control of the drive transistors. The effects of crosstalk and capacitive coupling are reduced as a result.Type: GrantFiled: February 25, 2004Date of Patent: May 13, 2008Assignee: Nellcor Puritan Bennett Inc.Inventors: Bradford B. Chew, Ethan Petersen, William Shea
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Patent number: 7355539Abstract: There is provided a pulse oximeter circuit including a feedback circuit configured to receive a digital output signal of a multi-bit sigma-delta modulator and generate a pulse width modulated signal (PWM). The PWM signal is directed to a first switching circuit and a D flip-flop. The first switching circuit provides a first or second reference voltage as a feedback signal to the multi-bit sigma-delta modulator. The D flip-flop generates a sample and hold signal. The sample and hold signal controls a second switching circuit coupled to the input of the multi-bit sigma-delta modulator.Type: GrantFiled: November 27, 2006Date of Patent: April 8, 2008Assignee: Nellcor Puritan Bennett Inc.Inventors: Ethan Petersen, William Shea, Bradford B. Chew
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Publication number: 20070208240Abstract: Low power techniques for sensing cardiac pulses in a signal from a sensor are provided. A pulse detection block senses the sensor signal and determines its signal-to-noise ratio. After comparing the signal-to-noise ratio to a threshold, the drive current of light emitting elements in the sensor is dynamically adjusted to reduce power consumption while maintaining the signal-to-noise ratio at an adequate level. The signal component of the sensor signal can be measured by identifying systolic transitions. The systolic transitions are detected using a maximum and minimum derivative averaging scheme. The moving minimum and the moving maximum are compared to the scaled sum of the moving minimum and moving maximum to identify the systolic transitions. Once the signal component has been identified, the signal component is compared to a noise component to calculate the signal-to-noise ratio.Type: ApplicationFiled: January 8, 2007Publication date: September 6, 2007Applicant: Nellcor Puritan Bennett Inc.Inventors: Brad Nordstrom, William Shea, Ethan Petersen
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Publication number: 20070132618Abstract: There is provided a pulse oximeter circuit including a feedback circuit configured to receive a digital output signal of a multi-bit sigma-delta modulator and generate a pulse width modulated signal (PWM). The PWM signal is directed to a first switching circuit and a D flip-flop. The first switching circuit provides a first or second reference voltage as a feedback signal to the multi-bit sigma-delta modulator. The D flip-flop generates a sample and hold signal. The sample and hold signal controls a second switching circuit coupled to the input of the multi-bit sigma-delta modulator.Type: ApplicationFiled: November 27, 2006Publication date: June 14, 2007Applicant: Nellcor Puritan Bennett Inc.Inventors: Ethan Petersen, William Shea, Bradford Chew
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Patent number: 7215985Abstract: A method and apparatus for reducing cross-talk in an oximeter. The oximeter includes a band pass filter. The amount of cross-talk through the band pass filter is estimated. Based on this estimate, the corner frequencies of the band pass filter are adjusted when it is designed to minimize the cross-talk. In one embodiment, a calibration mode is performed when a sensor is attached to the oximeter. In the calibration mode, the signals are measured with first only the red LED on and then with only the IR LED on. Any signal measured in the off channel is assumed to be a result of cross-talk from the other channel. The magnitude of the cross-talk is determined as a percentage, and subsequently the percentage is multiplied by the actual signal and subtracted from the other LED signal as cross-talk compensation.Type: GrantFiled: February 25, 2004Date of Patent: May 8, 2007Assignee: Nellcor Puritain Bennett Inc.Inventors: Ethan Petersen, Bradford B. Chew, William Shea
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Patent number: 7212847Abstract: A method and apparatus for providing a substantially real-time representation of an analog representation of a physiological signal is provided. The waveform signal from the sensor is converted into digital form. A delta-sigma modulator is used as a simple Digital-to-analog Converter (DAC). The output can then be provided through a simple hardware filter to give an analog output signal in nearly real-time, which can be used for other instruments, synchronization, display, etc.Type: GrantFiled: February 25, 2004Date of Patent: May 1, 2007Assignee: Nellcor Puritan Bennett LLCInventors: Ethan Petersen, William Shea, Bradford B. Chew
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Patent number: 7190985Abstract: A pulse oximeter method and apparatus which provides (1) a notch filter at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.Type: GrantFiled: February 25, 2004Date of Patent: March 13, 2007Assignee: Nellcor Puritan Bennett Inc.Inventors: Ethan Petersen, William Shea, Bradford B. Chew
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Patent number: 7162288Abstract: Low power techniques for sensing cardiac pulses in a signal from a sensor are provided. A pulse detection block senses the sensor signal and determines its signal-to-noise ratio. After comparing the signal-to-noise ratio to a threshold, the drive current of light emitting elements in the sensor is dynamically adjusted to reduce power consumption while maintaining the signal-to-noise ratio at an adequate level. The signal component of the sensor signal can be measured by identifying systolic transitions. The systolic transitions are detected using a maximum and minimum derivative averaging scheme. The moving minimum and the moving maximum are compared to the scaled sum of the moving minimum and moving maximum to identify the systolic transitions. Once the signal component has been identified, the signal component is compared to a noise component to calculate the signal-to-noise ratio.Type: GrantFiled: February 25, 2004Date of Patent: January 9, 2007Assignee: Nellcor Purtain Bennett IncorporatedInventors: Brad Nordstrom, William Shea, Ethan Petersen
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Patent number: 7142142Abstract: An oximeter uses a sigma-delta modulator and a multi-bit ADC with PWM feedback enabling high precision multi-bit conversion. Demodulation is done in software, thus requiring only a single hardware path for both red and IR. Multiple capacitors are switched into the integrator in the sigma-delta modulator, with different capacitors for red, IR and dark signals, thus enabling the use of the single hardware path. A switching circuit at the input of the sigma-delta modulator acts as a sample and hold, controlled by the PWM feedback.Type: GrantFiled: February 25, 2004Date of Patent: November 28, 2006Assignee: Nelicor Puritan Bennett, Inc.Inventors: Ethan Petersen, William Shea, Bradford B. Chew
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Publication number: 20060264721Abstract: A pulse oximeter method and apparatus which provides (1) a notch filter at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.Type: ApplicationFiled: July 28, 2006Publication date: November 23, 2006Applicant: Nellcor Puritan Bennett Incorporated a corporation of DelawareInventors: Ethan Petersen, William Shea, Bradford Chew