Patents by Inventor Andres Walker
Andres Walker 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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Patent number: 11633656Abstract: Various embodiments for a golf putting training aid having a first stake coupled to a second stake by an upper alignment string and a lower alignment string that collectively establish parallel reference putting lines when the first and second stakes are deployed around a putting surface to train a golfer to properly align their eyes when executing a putt are disclosed.Type: GrantFiled: November 2, 2021Date of Patent: April 25, 2023Assignee: Dubline Golf, LLCInventor: Andres Walker
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Publication number: 20220134207Abstract: Various embodiments for a golf putting training aid having a first stake coupled to a second stake by an upper alignment string and a lower alignment string that collectively establish parallel reference putting lines when the first and second stakes are deployed around a putting surface to train a golfer to properly align their eyes when executing a putt are disclosed.Type: ApplicationFiled: November 2, 2021Publication date: May 5, 2022Inventor: Andres Walker
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Publication number: 20190143103Abstract: A medical device for conducting electrical signal comprises an elongate member and a plurality of cables. Each cable may have three concentric layers: a first layer with an inner conductor, a second layer with an inner insulator, and a third layer with an outer conductor. The inner insulator electrically isolates the outer conductor from the inner conductor.Type: ApplicationFiled: October 9, 2018Publication date: May 16, 2019Inventors: Vivek SHARMA, Andre WALKER, Apratim DIXIT
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Patent number: 10092747Abstract: A medical device for conducting electrical signal comprises an elongate member and a plurality of cables. Each cable may have three concentric layers: a first layer with an inner conductor, a second layer with an inner insulator, and a third layer with an outer conductor. The inner insulator electrically isolates the outer conductor from the inner conductor.Type: GrantFiled: May 1, 2015Date of Patent: October 9, 2018Assignee: NEVRO CORPORATIONInventors: Vivek Sharma, Andre Walker, Apratim Dixit
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Publication number: 20150314123Abstract: A medical device for conducting electrical signal comprises an elongate member and a plurality of cables. Each cable may have three concentric layers: a first layer with an inner conductor, a second layer with an inner insulator, and a third layer with an outer conductor. The inner insulator electrically isolates the outer conductor from the inner conductor.Type: ApplicationFiled: May 1, 2015Publication date: November 5, 2015Inventors: Vivek SHARMA, Andre Walker, Apratim Dixit
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Patent number: 9107585Abstract: An implantable system acquires intracardiac impedance with an implantable lead system. In one implementation, the system generates frequency-rich, low energy, multi-phasic waveforms that provide a net-zero charge and a net-zero voltage. When applied to bodily tissues, current pulses or voltage pulses having the multi-phasic waveform provide increased specificity and sensitivity in probing tissue. The effects of the applied pulses are sensed as a corresponding waveform. The waveforms of the applied and sensed pulses can be integrated to obtain corresponding area values that represent the current and voltage across a spectrum of frequencies. These areas can be compared to obtain a reliable impedance value for the tissue. Frequency response, phase delay, and response to modulated pulse width can also be measured to determine a relative capacitance of the tissue, indicative of infarcted tissue, blood to tissue ratio, degree of edema, and other physiological parameters.Type: GrantFiled: March 12, 2007Date of Patent: August 18, 2015Assignee: Pacesetter, Inc.Inventors: Louis Wong, Cem Shaquer, Gene A. Bornzin, Euljoon Park, Andre Walker, Dorin Panescu
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Publication number: 20140214110Abstract: An implantable device monitors and treats heart failure, pulmonary edema, and hemodynamic conditions and in some cases applies therapy. In one implementation, the implantable device applies a high-frequency multi-phasic pulse waveform over multiple-vectors through tissue. The waveform has a duration less than the charging time constant of electrode-electrolyte interfaces in vivo to reduce intrusiveness while increasing sensitivity and specificity for trending parameters. The waveform can be multiplexed over multiple vectors and the results cross-correlated or subjected to probabilistic analysis or thresholding schemata to stage heart failure or pulmonary edema. In one implementation, a fractionation morphology of a sensed impedance waveform is used to trend intracardiac pressure to stage heart failure and to regulate cardiac resynchronization therapy. The waveform also provides unintrusive electrode integrity checks and 3-D impedancegrams.Type: ApplicationFiled: November 1, 2013Publication date: July 31, 2014Applicant: Pacesetter, Inc.Inventors: Weiqun Yang, Malin Ohlander, Louis Wong, Nils Holmstrom, Cem Shaquer, Euljoon Park, Dorin Panescu, Shahrooz Shahparnia, Andre Walker, Ajit Pillai, Mihir Naware
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Patent number: 8712519Abstract: Techniques are provided for controlling therapy provided by the implantable cardiac stimulation device based on cardiogenic impedance. A cardiogenic impedance signal (or intracardiac impedance signal) is an impedance signal representative of the beating of the heart of the patient in which the device is implanted. The cardiogenic impedance signal is sensed along a sensing vector passing through at least a portion of the heart so that the sensed impedance is affected by the mechanical beating of the heart along that sensing vector. Pacing therapy is automatically and adaptively adjusted based on the cardiogenic impedance signal. For example, pacing timing parameters such as the atrioventricular delay and the inter-ventricular delay may be adjusted. Preferably, the adjustments are adaptive, i.e. the adjustments are performed in a closed-loop so as to adapt the adjustments to changes in the cardiogenic impedance signal so as to optimize therapy.Type: GrantFiled: November 9, 2006Date of Patent: April 29, 2014Assignee: Pacesetter, Inc.Inventors: Dorin Panescu, Weiqun Yang, Louis Wong, Nils Holmstrom, Andre Walker
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Patent number: 8600497Abstract: An implantable device monitors and treats heart failure, pulmonary edema, and hemodynamic conditions and in some cases applies therapy. In one implementation, the implantable device applies a high-frequency multi-phasic pulse waveform over multiple-vectors through tissue. The waveform has a duration less than the charging time constant of electrode-electrolyte interfaces in vivo to reduce intrusiveness while increasing sensitivity and specificity for trending parameters. The waveform can be multiplexed over multiple vectors and the results cross-correlated or subjected to probabilistic analysis or thresholding schemata to stage heart failure or pulmonary edema. In one implementation, a fractionation morphology of a sensed impedance waveform is used to trend intracardiac pressure to stage heart failure and to regulate cardiac resynchronization therapy. The waveform also provides unintrusive electrode integrity checks and 3-D impedancegrams.Type: GrantFiled: November 9, 2006Date of Patent: December 3, 2013Assignee: Pacesetter, Inc.Inventors: Weiqun Yang, Malin Ohlander, Louis Wong, Nils Holmstrom, Cem Shaquer, Euljoon Park, Dorin Panescu, Shahrooz Shahparnia, Andre Walker, Ajit Pillai, Mihir Naware
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Patent number: 8306623Abstract: An implantable system acquires intracardiac impedance with an implantable lead system. In one implementation, the system generates frequency-rich, low energy, multi-phasic waveforms that provide a net-zero charge and a net-zero voltage. When applied to bodily tissues, current pulses or voltage pulses having the multi-phasic waveform provide increased specificity and sensitivity in probing tissue. The effects of the applied pulses are sensed as a corresponding waveform. The waveforms of the applied and sensed pulses can be integrated to obtain corresponding area values that represent the current and voltage across a spectrum of frequencies. These areas can be compared to obtain a reliable impedance value for the tissue. Frequency response, phase delay, and response to modulated pulse width can also be measured to determine a relative capacitance of the tissue, indicative of infarcted tissue, blood to tissue ratio, degree of edema, and other physiological parameters.Type: GrantFiled: May 31, 2011Date of Patent: November 6, 2012Assignee: Pacesetter, Inc.Inventors: Louis Wong, Cem Shaquer, Gene A. Bornzin, Euljoon Park, Andre Walker, Dorin Panescu, Jiong Xia, Shahrooz Shahparnia
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Patent number: 8200330Abstract: An implanted cardioverter defibrillator (ICD) delivers an electrical therapy signal to the heart of a patient. When ventricular fibrillation or another condition of the heart requiring high voltage therapy is sensed, the therapy signal is delivered to the heart. When a partial short-circuit or other low impedance condition occurs, an over-current protection circuit will stop delivery of a shocking pulse. The ICD will then reduce the voltage of the shocking pulse and try again to deliver electrical therapy. This process is repeated until a voltage level is found that is able to deliver the electrical therapy without causing an over-voltage condition. Alternate lead configurations may also be tried in an attempt to find a signal path that is not affected by the low impedance or short-circuit condition.Type: GrantFiled: May 17, 2010Date of Patent: June 12, 2012Assignee: Pacesetter, Inc.Inventors: Mark Kroll, Gabriel A. Mouchawar, J. Christopher Moulder, Andre Walker
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Publication number: 20120053470Abstract: An implantable system acquires intracardiac impedance with an implantable lead system. In one implementation, the system generates frequency-rich, low energy, multi-phasic waveforms that provide a net-zero charge and a net-zero voltage. When applied to bodily tissues, current pulses or voltage pulses having the multi-phasic waveform provide increased specificity and sensitivity in probing tissue. The effects of the applied pulses are sensed as a corresponding waveform. The waveforms of the applied and sensed pulses can be integrated to obtain corresponding area values that represent the current and voltage across a spectrum of frequencies. These areas can be compared to obtain a reliable impedance value for the tissue. Frequency response, phase delay, and response to modulated pulse width can also be measured to determine a relative capacitance of the tissue, indicative of infarcted tissue, blood to tissue ratio, degree of edema, and other physiological parameters.Type: ApplicationFiled: May 31, 2011Publication date: March 1, 2012Inventors: Louis Wong, Cem Shaquer, Gene A. Bornzin, Euljoon Park, Andre Walker, Dorin Panescu, Jiong Xia, Shahrooz Shahparnia
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Patent number: 8065005Abstract: An implantable system acquires intracardiac impedance with an implantable lead system. In one implementation, the system generates frequency-rich, low energy, multi-phasic waveforms that provide a net-zero charge and a net-zero voltage. When applied to bodily tissues, current pulses or voltage pulses having the multi-phasic waveform provide increased specificity and sensitivity in probing tissue. The effects of the applied pulses are sensed as a corresponding waveform. The waveforms of the applied and sensed pulses can be integrated to obtain corresponding area values that represent the current and voltage across a spectrum of frequencies. These areas can be compared to obtain a reliable impedance value for the tissue. Frequency response, phase delay, and response to modulated pulse width can also be measured to determine a relative capacitance of the tissue, indicative of infarcted tissue, blood to tissue ratio, degree of edema, and other physiological parameters.Type: GrantFiled: March 12, 2007Date of Patent: November 22, 2011Assignee: Pacesetter, Inc.Inventors: Louis Wong, Cem Shaquer, Gene A. Bornzin, Euljoon Park, Andre Walker, Dorin Panescu, Jiong Xia, Shahrooz Shahparnia
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Patent number: 8010196Abstract: An implantable system acquires intracardiac impedance with an implantable lead system. In one implementation, the system generates frequency-rich, low energy, multi-phasic waveforms that provide a net-zero charge and a net-zero voltage. When applied to bodily tissues, current pulses or voltage pulses having the multi-phasic waveform provide increased specificity and sensitivity in probing tissue. The effects of the applied pulses are sensed as a corresponding waveform. The waveforms of the applied and sensed pulses can be integrated to obtain corresponding area values that represent the current and voltage across a spectrum of frequencies. These areas can be compared to obtain a reliable impedance value for the tissue. Frequency response, phase delay, and response to modulated pulse width can also be measured to determine a relative capacitance of the tissue, indicative of infarcted tissue, blood to tissue ratio, degree of edema, and other physiological parameters.Type: GrantFiled: March 12, 2007Date of Patent: August 30, 2011Assignee: Pacesetter, Inc.Inventors: Louis Wong, Cem Shaquer, Gene A. Bornzin, Euljoon Park, Andre Walker, Dorin Panescu, Jiong Xia, Shahrooz Shahparnia
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Patent number: 7945326Abstract: An implantable system acquires intracardiac impedance with an implantable lead system. In one implementation, the system generates frequency-rich, low energy, multi-phasic waveforms that provide a net-zero charge and a net-zero voltage. When applied to bodily tissues, current pulses or voltage pulses having the multi-phasic waveform provide increased specificity and sensitivity in probing tissue. The effects of the applied pulses are sensed as a corresponding waveform. The waveforms of the applied and sensed pulses can be integrated to obtain corresponding area values that represent the current and voltage across a spectrum of frequencies. These areas can be compared to obtain a reliable impedance value for the tissue. Frequency response, phase delay, and response to modulated pulse width can also be measured to determine a relative capacitance of the tissue, indicative of infarcted tissue, blood to tissue ratio, degree of edema, and other physiological parameters.Type: GrantFiled: March 12, 2007Date of Patent: May 17, 2011Assignee: Pacesetter, Inc.Inventors: Louis Wong, Cem Shaquer, Gene A. Bornzin, Euljoon Park, Andre Walker, Dorin Panescu
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Patent number: 7925349Abstract: An implantable system acquires intracardiac impedance with an implantable lead system. In one implementation, the system generates frequency-rich, low energy, multi-phasic waveforms that provide a net-zero charge and a net-zero voltage. When applied to bodily tissues, current pulses or voltage pulses having the multi-phasic waveform provide increased specificity and sensitivity in probing tissue. The effects of the applied pulses are sensed as a corresponding waveform. The waveforms of the applied and sensed pulses can be integrated to obtain corresponding area values that represent the current and voltage across a spectrum of frequencies. These areas can be compared to obtain a reliable impedance value for the tissue. Frequency response, phase delay, and response to modulated pulse width can also be measured to determine a relative capacitance of the tissue, indicative of infarcted tissue, blood to tissue ratio, degree of edema, and other physiological parameters.Type: GrantFiled: March 12, 2007Date of Patent: April 12, 2011Assignee: Pacesetter, Inc.Inventors: Louis Wong, Cem Shaquer, Gene A. Bornzin, Euljoon Park, Andre Walker, Dorin Panescu, Jiong Xia
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Publication number: 20100228307Abstract: An implanted cardioverter defibrillator (ICD) delivers an electrical therapy signal to the heart of a patient. When ventricular fibrillation or another condition of the heart requiring high voltage therapy is sensed, the therapy signal is delivered to the heart. When a partial short-circuit or other low impedance condition occurs, an over-current protection circuit will stop delivery of a shocking pulse. The ICD will then reduce the voltage of the shocking pulse and try again to deliver electrical therapy. This process is repeated until a voltage level is found that is able to deliver the electrical therapy without causing an over-voltage condition. Alternate lead configurations may also be tried in an attempt to find a signal path that is not affected by the low impedance or short-circuit condition.Type: ApplicationFiled: May 17, 2010Publication date: September 9, 2010Applicant: PACESETTER, INC.Inventors: Mark W. Kroll, Gabriel A. Mouchawar, J. Christopher Moulder, Andre Walker
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Patent number: 7747320Abstract: An implanted cardioverter defibrillator (ICD) delivers an electrical therapy signal to the heart of a patient. When ventricular fibrillation or another condition of the heart requiring high voltage therapy is sensed, the therapy signal is delivered to the heart. When a partial short-circuit or other low impedance condition occurs, an over-current protection circuit will stop delivery of a shocking pulse. The ICD will then reduce the voltage of the shocking pulse and try again to deliver electrical therapy. This process is repeated until a voltage level is found that is able to deliver the electrical therapy without causing an over-voltage condition. Alternate lead configurations may also be tried in an attempt to find a signal path that is not affected by the low impedance or short-circuit condition.Type: GrantFiled: May 12, 2006Date of Patent: June 29, 2010Assignee: Pacesetter, Inc.Inventors: Mark W. Kroll, Gabriel A. Mouchawar, J. Christopher Moulder, Andre Walker
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Patent number: 6636083Abstract: An active feedback loop is provided in a switched-capacitor circuit to automatically cancel both junction and sub-Vth channel leakage. Low power consumption that is crucial for implantable medical devices is achieved. The circuit technique largely minimizes the effective leakage current when the switch is turned off. This circuit technique of the invention can be used in many different circuit applications.Type: GrantFiled: October 3, 2001Date of Patent: October 21, 2003Assignee: Pacesetter, Inc.Inventors: Louis Wong, Shohan Hossain, Andre Walker
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Patent number: 5041802Abstract: In an oscillator circuit, a high gain, high power driver is placed in parallel with a standard low gain, low power driver for driving the oscillator output. A control signal is derived from the output of the oscillator circuit and fed back to control the high gain driver. After the circuit output has achieved stable oscillations for a predetermined time period, the high gain driver is turned off. Employment of the high gain driver ensures high start-up ability. The overall power consumption remains low since the high gain driver is turned off after stable oscillations have been achieved.Type: GrantFiled: October 11, 1989Date of Patent: August 20, 1991Assignee: Zilog, Inc.Inventors: Tom S. Wei, Andre Walker, Elisabeth Ekman