Patents by Inventor James Hamilton Wah
James Hamilton Wah 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: 11944440Abstract: An implantable device for estimating neural recruitment arising from a stimulus, has a plurality of electrodes. A stimulus source provides stimuli to be delivered from the electrodes to neural tissue. Measurement circuitry obtains a measurement of a neural signal sensed at the electrodes. A control unit is configured to control application of a selected stimulus to neural tissue using the stimulus electrodes; and after the selected neural stimulus, apply a probe stimulus having a short pulse width. A remnant neural response evoked by the probe stimulus is measured; and the control unit estimates from the remnant neural response a neural recruitment caused by the selected neural stimulus.Type: GrantFiled: August 22, 2022Date of Patent: April 2, 2024Assignee: Saluda Medical Pty LtdInventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Peter Scott Vallack Single
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Patent number: 11944439Abstract: An implantable device for controlling electrical conditions of body tissue. A feedback sense electrode and a compensation electrode are positioned proximal to the tissue to make electrical contact with the tissue. A feedback amplifier is referenced to ground, and takes as an input a feedback signal from the feedback sense electrode. The output of the feedback amplifier is connected to the compensation electrode. The feedback amplifier thus drives the neural tissue via the compensation electrode in a feedback arrangement which seeks to drive the feedback signal to ground, or other desired electrical value.Type: GrantFiled: May 23, 2022Date of Patent: April 2, 2024Assignee: Saluda Medical Pty LtdInventors: Peter Scott Vallack Single, James Hamilton Wah
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Publication number: 20240033522Abstract: Recording evoked neural responses comprises delivering a stimulus from one or more stimulus electrodes to a neural pathway in order to give rise to an evoked compound action potential (ECAP) on the neural pathway. And, recording with measurement circuitry, during delivery of at least part of the stimulus, a neural compound action potential signal sensed at one or more sense electrodes. And, processing the recording of the neural compound action potential signal to determine at least one characteristic of the ECAP. At least one characteristic of the stimulus is then defined based on the determined at least one characteristic of the ECAP.Type: ApplicationFiled: February 9, 2022Publication date: February 1, 2024Applicant: Saluda Medical Pty LtdInventors: Dean Michael Karantonis, Peter Scott Vallack Single, James Hamilton Wah
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Publication number: 20240000358Abstract: An implantable device for estimating neural recruitment arising from a stimulus, has a plurality of electrodes. A stimulus source provides stimuli to be delivered from the electrodes to neural tissue. Measurement circuitry obtains a measurement of a neural signal sensed at the electrodes. A control unit is configured to control application of a selected stimulus to neural tissue using the stimulus electrodes; and after the selected neural stimulus, apply a probe stimulus having a short pulse width. A remnant neural response evoked by the probe stimulus is measured; and the control unit estimates from the remnant neural response a neural recruitment caused by the selected neural stimulus.Type: ApplicationFiled: August 22, 2022Publication date: January 4, 2024Inventors: John Louis PARKER, James Hamilton WAH, Dean Michael KARANTONIS, Peter Scott Vallack SINGLE
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Publication number: 20230398360Abstract: A method of controlling a neural stimulus, the neural stimulus being defined by at least one stimulus intensity parameter. The method comprises generating a stimulus intensity parameter to control a stimulator that generates a stimulus current for application to a tissue, measuring a response of the tissue, evoked by the stimulus current, determining a forward adjustment parameter as a function of the stimulus intensity parameter, determining a feedback parameter derived from the measured response and the forward adjustment parameter and adjusting the stimulus intensity parameter according to the feedback parameter.Type: ApplicationFiled: August 27, 2021Publication date: December 14, 2023Applicant: Saluda Medical Pty LtdInventors: Peter Scott Vallack Single, Joanne Carol Shiels Olecko, Robert Bruce Gorman, James Hamilton Wah
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Publication number: 20230337962Abstract: Controlling a neural stimulus comprises applying the neural stimulus to a neural pathway in order to give rise to an evoked action potential on the neural pathway, the stimulus being defined by at least one stimulus parameter. A neural compound action potential response evoked by the stimulus is measured, and from the measured evoked response a feedback variable is derived. Loop backoff behaviour is adjusted by applying a non-identity function to the feedback variable to produce a revised feedback variable, and completing a feedback loop by using the revised feedback variable to control the at least one stimulus parameter so as to maintain the feedback variable at a setpoint. Additionally, or alternatively, loop gain can be adjusted in response to a change in the loop setpoint, and/or a logarithm of the stimulus parameter can be controlled.Type: ApplicationFiled: August 30, 2021Publication date: October 26, 2023Applicant: Saluda Medical Pty LtdInventor: James Hamilton Wah
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Publication number: 20230310843Abstract: An implantable device is configured to control application of a neural stimulus as defined by a stimulus parameter; measure via the measurement circuitry a characteristic of a neural compound action potential response evoked by the stimulus; and compute, using the stimulus parameter and the measured characteristic of the evoked neural compound action potential response, a characteristic of an evoked response that would be obtained from the neural stimulus if the patient were in a reference posture. A posture of the patient can be estimated from the computed characteristic and/or the computed characteristic can be used as a feedback variable of a feedback loop. Multidimensional histograms of datasets comprising at least one of the stimulus parameter and a feedback variable can be stored.Type: ApplicationFiled: August 30, 2021Publication date: October 5, 2023Applicant: Saluda Medical Pty LtdInventors: James Hamilton Wah, Amol Malla
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Publication number: 20230310867Abstract: A method of controlling a neural stimulus, the neural stimulus being defined by at least one stimulus intensity parameter. The method comprises, generating a stimulus intensity parameter to control a stimulator that generates a stimulus current for application to a tissue, measuring a response of the tissue, evoked by the stimulus current, determining a response parameter indicative of the measured response, in response to the response parameter being less than a first threshold, setting the stimulus intensity parameter to a desired stimulus intensity level; and in response to the response parameter being greater than a second threshold, adjust the stimulus intensity parameter according to a feedback variable derived from the measured response.Type: ApplicationFiled: August 27, 2021Publication date: October 5, 2023Applicant: Saluda Medical Pty LtdInventors: Peter Scott Vallack Single, Joanne Carol Shiels Olecko, Robert Bruce Gorman, James Hamilton Wah
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Publication number: 20230277850Abstract: Disclosed is a neuromodulation system comprising a neuromodulation device for controllably delivering a neural stimulus, and a processor.Type: ApplicationFiled: March 3, 2023Publication date: September 7, 2023Applicant: Saluda Medical Pty LtdInventors: Daniel John Parker, James Hamilton Wah, Samuel Nicholas Gilbert, Dean Michael Karantonis, Matthew Marlon Williams, John Louis Parker
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Publication number: 20230241397Abstract: A method of applying a neural stimulus with an implanted electrode array involves applying a sequence of stimuli configured to yield a therapeutic effect while suppressing psychophysical side effects. The stimuli sequence is configured such that a first stimulus recruits a portion of the fibre population, and a second stimulus is delivered within the refractory period following the first stimulus and the second stimulus being configured to recruit a further portion of the fibre population. Using an electrode array and suitable relative timing of the stimuli, ascending or descending volleys of evoked responses can be selectively synchronised or desynchronised to give directional control over responses evoked.Type: ApplicationFiled: December 7, 2022Publication date: August 3, 2023Inventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Milan Obradovic, Robert Bruce Gorman
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Publication number: 20230233859Abstract: This disclosure relates to a device for applying a neural stimulus. A battery supplies electrical energy at a battery voltage and an electrode applies the electrical energy to neural tissue. A circuit measures the nervous response of the tissue and a voltage converter receives the electrical energy from the battery and controls a voltage applied to the electrode based on the measured nervous response of the tissue. This direct voltage control is energy efficient because losses across a typical current mirror are avoided. Further, the control based on the measured nervous response leads to automatic compensation of impedance variation due to in-growth or change in posture. As a result, the stimulation results in a desired neural response.Type: ApplicationFiled: April 4, 2023Publication date: July 27, 2023Applicant: Saluda Medical Pty LtdInventors: Peter Scott Vallack Single, James Hamilton Wah
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Publication number: 20230200738Abstract: A device for recording evoked neural responses, comprising one or more stimulus electrodes and one or more sense electrodes. The device has a stimulus source for providing a stimulus to be delivered from the stimulus electrodes to a neural pathway in order to give rise to an evoked action potential on the neural pathway. The device has measurement circuitry for recording a neural compound action potential signal sensed at the sense electrodes. Crosstalk cancellation circuitry is configured to produce a stimulus crosstalk cancellation signal, and is configured to inject the stimulus crosstalk cancellation signal into the measurement circuitry. The stimulus crosstalk cancellation signal is configured to cancel a stimulus crosstalk voltage arising upon the one or more sense electrodes as a result of delivery of the stimulus.Type: ApplicationFiled: May 18, 2021Publication date: June 29, 2023Applicant: Saluda Medical Pty LtdInventors: Peter Scott Vallack Single, James Hamilton Wah
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Patent number: 11554265Abstract: A method of applying a neural stimulus with an implanted electrode array involves applying a sequence of stimuli configured to yield a therapeutic effect while suppressing psychophysical side effects. The stimuli sequence is configured such that a first stimulus recruits a portion of the fibre population, and a second stimulus is delivered within the refractory period following the first stimulus and the second stimulus being configured to recruit a further portion of the fibre population. Using an electrode array and suitable relative timing of the stimuli, ascending or descending volleys of evoked responses can be selectively synchronised or desynchronised to give directional control over responses evoked.Type: GrantFiled: October 29, 2021Date of Patent: January 17, 2023Assignee: Saluda Medical Pty LtdInventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Milan Obradovic, Robert Bruce Gorman
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Publication number: 20220354406Abstract: An implantable device for controlling electrical conditions of body tissue. A feedback sense electrode and a compensation electrode are positioned proximal to the tissue to make electrical contact with the tissue. A feedback amplifier is referenced to ground, and takes as an input a feedback signal from the feedback sense electrode. The output of the feedback amplifier is connected to the compensation electrode. The feedback amplifier thus drives the neural tissue via the compensation electrode in a feedback arrangement which seeks to drive the feedback signal to ground, or other desired electrical value.Type: ApplicationFiled: May 23, 2022Publication date: November 10, 2022Inventors: Peter Scott Vallack SINGLE, James Hamilton WAH
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Patent number: 11491334Abstract: A method of applying a neural stimulus with an implanted electrode array involves applying a sequence of stimuli configured to yield a therapeutic effect while suppressing psychophysical side effects. The stimuli sequence is configured such that a first stimulus recruits a portion of the fibre population, and a second stimulus is delivered within the refractory period following the first stimulus and the second stimulus being configured to recruit a further portion of the fibre population. Using an electrode array and suitable relative timing of the stimuli, ascending or descending volleys of evoked responses can be selectively synchronised or desynchronised to give directional control over responses evoked.Type: GrantFiled: September 24, 2020Date of Patent: November 8, 2022Assignee: Saluda Medical Pty LtdInventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Milan Obradovic, Robert Bruce Gorman
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Patent number: 11464979Abstract: A method of applying a neural stimulus with an implanted electrode array involves applying a sequence of stimuli configured to yield a therapeutic effect while suppressing psychophysical side effects. The stimuli sequence is configured such that a first stimulus recruits a portion of the fibre population, and a second stimulus is delivered within the refractory period following the first stimulus and the second stimulus being configured to recruit a further portion of the fibre population. Using an electrode array and suitable relative timing of the stimuli, ascending or descending volleys of evoked responses can be selectively synchronised or desynchronised to give directional control over responses evoked.Type: GrantFiled: September 29, 2021Date of Patent: October 11, 2022Assignee: Saluda Medical Pty LtdInventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Milan Obradovic, Robert Bruce Gorman
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Patent number: 11445958Abstract: An implantable device for estimating neural recruitment arising from a stimulus, has a plurality of electrodes. A stimulus source provides stimuli to be delivered from the electrodes to neural tissue. Measurement circuitry obtains a measurement of a neural signal sensed at the electrodes. A control unit is configured to control application of a selected stimulus to neural tissue using the stimulus electrodes; and after the selected neural stimulus, apply a probe stimulus having a short pulse width. A remnant neural response evoked by the probe stimulus is measured; and the control unit estimates from the remnant neural response a neural recruitment caused by the selected neural stimulus.Type: GrantFiled: June 22, 2021Date of Patent: September 20, 2022Assignee: Saluda Medical Pty LtdInventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Peter Scott Vallack Single
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Patent number: 11426587Abstract: A method of applying a neural stimulus with an implanted electrode array involves applying a sequence of stimuli configured to yield a therapeutic effect while suppressing psychophysical side effects. The stimuli sequence is configured such that a first stimulus recruits a portion of the fibre population, and a second stimulus is delivered within the refractory period following the first stimulus and the second stimulus being configured to recruit a further portion of the fibre population. Using an electrode array and suitable relative timing of the stimuli, ascending or descending volleys of evoked responses can be selectively synchronised or desynchronised to give directional control over responses evoked.Type: GrantFiled: January 14, 2022Date of Patent: August 30, 2022Assignee: Saluda Medical Pty LtdInventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Milan Obradovic, Robert Bruce Gorman
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Patent number: 11420064Abstract: A method of applying a neural stimulus with an implanted electrode array involves applying a sequence of stimuli configured to yield a therapeutic effect while suppressing psychophysical side effects. The stimuli sequence is configured such that a first stimulus recruits a portion of the fibre population, and a second stimulus is delivered within the refractory period following the first stimulus and the second stimulus being configured to recruit a further portion of the fibre population. Using an electrode array and suitable relative timing of the stimuli, ascending or descending volleys of evoked responses can be selectively synchronised or desynchronised to give directional control over responses evoked.Type: GrantFiled: September 17, 2021Date of Patent: August 23, 2022Assignee: Saluda Medical Pty LtdInventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Milan Obradovic, Robert Bruce Gorman
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Patent number: 11413460Abstract: A method of applying a neural stimulus with an implanted electrode array involves applying a sequence of stimuli configured to yield a therapeutic effect while suppressing psychophysical side effects. The stimuli sequence is configured such that a first stimulus recruits a portion of the fibre population, and a second stimulus is delivered within the refractory period following the first stimulus and the second stimulus being configured to recruit a further portion of the fibre population. Using an electrode array and suitable relative timing of the stimuli, ascending or descending volleys of evoked responses can be selectively synchronised or desynchronised to give directional control over responses evoked.Type: GrantFiled: March 14, 2022Date of Patent: August 16, 2022Assignee: Saluda Medical Pty LtdInventors: John Louis Parker, James Hamilton Wah, Dean Michael Karantonis, Milan Obradovic, Robert Bruce Gorman