Patents by Inventor Erno Klaassen

Erno Klaassen 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).

  • Publication number: 20210041287
    Abstract: A sensor system includes a sensor stack, a differential amplifier, an analog-to-digital converter, and a processor. The sensor stack includes a piezoelectric material having a first side opposing a second side, a first electrode connected to the first side, and a second electrode connected to the second side. The differential amplifier is coupled to the first and second electrodes and is configured to generate a differential output indicative of vibrations sensed by the piezoelectric material. The analog-to-differential converter is configured to digitize the differential output. The processor is configured to identify a type of biological vibration included in the digitized differential output.
    Type: Application
    Filed: July 15, 2020
    Publication date: February 11, 2021
    Inventors: Henry Rimminen, Ali M. Amin, Timothy L. Weadon, Yindar Chuo, Zijing Zeng, Erno Klaassen
  • Publication number: 20200367767
    Abstract: A pulse transit time is measured non-invasively and used to calculate a blood pressure value. A method of determining one or more blood pressure values includes propagating an alternating drive current through a thorax of a subject via electrodes located on a wrist-worn device. Resulting voltage levels of the subject are sensed by the wrist-worn device. The voltage levels are processed to detect when a volume of blood is ejected from the left ventricle. Output from a pulse arrival sensor coupled to the wrist-worn device is processed to detect when a blood pressure pulse generated by ejection of the volume of blood from the left ventricle arrives at the wrist. A pulse transit time (PTT) for transit of the blood pressure pulse from the left ventricle to the wrist is calculated. One or more blood pressure values for the subject are determined based on the PTT.
    Type: Application
    Filed: August 11, 2020
    Publication date: November 26, 2020
    Inventors: Thomas J. Sullivan, Wren Nancy Dougherty, Richard C. Kimoto, Erno Klaassen, Ravi K. Narasimhan, Stephen J. Waydo, Todd K. Whitehurst, Derek Park-Shing Young, Santiago Quijano, Zijing Zeng
  • Patent number: 10779738
    Abstract: Wrist-worn devices and related methods measure a pulse transit time non-invasively and calculate a blood pressure value using the pulse transit time. A wrist-worn device include a wrist-worn elongate band, at least four EKG or ICG electrodes coupled to the wrist-worn device for detecting a ventricular ejection of a heart, a photo-plethysmogram (PPG) sensor coupled to the wrist-worn device for detecting arrival of a blood pressure pulse at the user's wrist, and a controller configured to calculate a pulse transit time (PTT) for the blood pressure pulse. The controller calculates one or more blood pressure values for the user based on the PTT.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: September 22, 2020
    Inventors: Thomas J. Sullivan, Wren Nancy Dougherty, Richard C. Kimoto, Erno Klaassen, Ravi Narasimhan, Stephen J. Waydo, Todd K. Whitehurst, Derek Park-Shing Young, Santiago Quijano, Zijing Zeng
  • Patent number: 10702171
    Abstract: The present invention generally relates to blood pressure monitoring. In some embodiments, methods and devices of measuring a mean arterial pressure are provided and/or monitoring blood pressure changes. A wrist-worn device may include a plurality of sensors backed by a plurality of actuators. Subsets of the plurality of sensors may be selectively actuateable against a wrist of a user using one or more of the plurality of actuators. A preferred sensor and location may be identified based on pressure signals received from each of the sensors. In some embodiments, devices may use a fluid bladder coupled with piezoelectric film sensors. A fluid bladder pressure sensor may be used to calibrate the piezoelectric film signal to provide a static and dynamic pressure reading. In yet another embodiment, a mean arterial pressure may be calculated by processing a swept pressure signal obtained as a sensor is swept through different heights.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: July 7, 2020
    Inventors: Ravi Narasimhan, Zijing Zeng, Richard C. Kimoto, Erno Klaassen, Thomas J. Sullivan, Derek Park-Shing Young, Todd K. Whitehurst
  • Patent number: 10517489
    Abstract: Wrist-worn devices and related methods measure a pulse transit time non-invasively and calculate a blood pressure value using the pulse transit time. A wrist-worn device includes an accelerometer, a photo-lethysmogram (PPG) or a pulse pressure sensor, and a controller. The PPG or the pulse pressure sensor coupled to the wrist-worn device for detecting an arrival of a blood pressure pulse at the user's wrist. The controller is configured to process output signals from the accelerometer to detect when the blood pressure pulse is propagated from the left ventricle of the user's heart, process a signal from the PPG or the pulse pressure sensor to detect when the blood pressure pulse arrives at the wrist, calculate a pulse transit time (PTT) for propagation of the blood pressure pulse from the left ventricle to the wrist, and generate one or more blood pressure values for the user based on the PTT.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: December 31, 2019
    Inventors: Ravi Narasimhan, Richard C. Kimoto, Thomas J. Sullivan, Todd K. Whitehurst, Derek Park-shing Young, Zijing Zeng, Erno Klaassen
  • Publication number: 20170360306
    Abstract: The present invention generally relates to blood pressure monitoring. In some embodiments, methods and devices of measuring a mean arterial pressure are provided and/or monitoring blood pressure changes. A wrist-worn device may include a plurality of sensors backed by a plurality of actuators. Subsets of the plurality of sensors may be selectively actuateable against a wrist of a user using one or more of the plurality of actuators. A preferred sensor and location may be identified based on pressure signals received from each of the sensors. In some embodiments, devices may use a fluid bladder coupled with piezoelectric film sensors. A fluid bladder pressure sensor may be used to calibrate the piezoelectric film signal to provide a static and dynamic pressure reading. In yet another embodiment, a mean arterial pressure may be calculated by processing a swept pressure signal obtained as a sensor is swept through different heights.
    Type: Application
    Filed: September 8, 2015
    Publication date: December 21, 2017
    Applicant: APPLE INC.
    Inventors: Ravi Narasimhan, Zijing Zeng, Richard C. Kimoto, Erno Klaassen, Thomas J. Sullivan, Derek Park-Shing Young, Todd K. Whitehurst
  • Publication number: 20170340219
    Abstract: Wrist-worn devices and related methods measure a pulse transit time non-invasively and calculate a blood pressure value using the pulse transit time. A wrist-worn device include a wrist-worn elongate band, at least four EKG or ICG electrodes coupled to the wrist-worn device for detecting a ventricular ejection of a heart, a photo-plethysmogram (PPG) sensor coupled to the wrist-worn device for detecting arrival of a blood pressure pulse at the user's wrist, and a controller configured to calculate a pulse transit time (PTT) for the blood pressure pulse. The controller calculates one or more blood pressure values for the user based on the PTT.
    Type: Application
    Filed: August 18, 2017
    Publication date: November 30, 2017
    Inventors: Thomas J. Sullivan, Wren Nancy Dougherty, Richard C. Kimoto, Erno Klaassen, Ravi Narasimhan, Stephen J. Waydo, Todd K. Whitehurst, Derek Park-Shing Young, Santiago Quijano, Zijing Zeng
  • Publication number: 20170281024
    Abstract: Wrist-worn devices and related methods measure a pulse transit time non-invasively and calculate a blood pressure value using the pulse transit time. A wrist-worn device includes an accelerometer, a photo-plethysmogram (PPG) or a pulse pressure sensor, and a controller. The PPG or the pulse pressure sensor coupled to the wrist-worn device for detecting an arrival of a blood pressure pulse at the user's wrist. The controller is configured to process output signals from the accelerometer to detect when the blood pressure pulse is propagated from the left ventricle of the user's heart, process a signal from the PPG or the pulse pressure sensor to detect when the blood pressure pulse arrives at the wrist, calculate a pulse transit time (PTT) for propagation of the blood pressure pulse from the left ventricle to the wrist, and generate one or more blood pressure values for the user based on the PTT.
    Type: Application
    Filed: September 8, 2015
    Publication date: October 5, 2017
    Inventors: Ravi Narasimhan, Richard C. Kimoto, Thomas J. Sullivan, Todd K. Whitehurst, Derek Park-shing Young, Zijing Zeng, Erno Klaassen
  • Patent number: 9037234
    Abstract: Described herein are implantable cardiac stimulation devices, and methods for use therewith. A pacing channel of such a device includes a pace output terminal, a pulse generator and at least two pace return electrode terminals. The pace output terminal is coupleable to an electrode for use as an anode. The pulse generator is configured to selectively output an electrical stimulation pulse to the pace output terminal. Each of the pace return electrode terminals is coupleable to a separate one of at least two further electrodes for use as a cathode. Switching circuitry selectively couples any one of the pace return electrode terminals of the pacing channel to the pace return capacitor of the pacing channel at a time, thereby enabling the pace return capacitor to be shared by at least two of the pace return electrode terminals of the pacing channel. Additional embodiments are also disclosed herein.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: May 19, 2015
    Assignee: Pacesetter, Inc.
    Inventors: Eric Labbe, Christian Sauer, Erno Klaassen
  • Patent number: 8965526
    Abstract: Active rejection techniques are used to cancel MRI gradient signals in an implantable medical device. An active component placed in an input channel of the implantable medical device actively rejects MRI gradient signals received on the input channel. A sensing circuit that senses an external MRI gradient signal generates a control signal that controls the active component. For example, the control signal may be the inverse of the external MRI gradient signal. An active component that receives an input signal including a desired signal component (e.g., a cardiac signal) and an undesired MRI gradient signal component may thus use this control signal to reject the undesired MRI gradient signal component.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: February 24, 2015
    Assignee: Pacesetter, Inc.
    Inventors: Jin Zhang, Erno Klaassen
  • Publication number: 20150032175
    Abstract: Described herein are implantable cardiac stimulation devices, and methods for use therewith. A pacing channel of such a device includes a pace output terminal, a pulse generator and at least two pace return electrode terminals. The pace output terminal is coupleable to an electrode for use as an anode. The pulse generator is configured to selectively output an electrical stimulation pulse to the pace output terminal. Each of the pace return electrode terminals is coupleable to a separate one of at least two further electrodes for use as a cathode. Switching circuitry selectively couples any one of the pace return electrode terminals of the pacing channel to the pace return capacitor of the pacing channel at a time, thereby enabling the pace return capacitor to be shared by at least two of the pace return electrode terminals of the pacing channel. Additional embodiments are also disclosed herein.
    Type: Application
    Filed: July 25, 2013
    Publication date: January 29, 2015
    Applicant: Pacesetter, Inc.
    Inventors: Eric Labbe, Christian Sauer, Erno Klaassen
  • Publication number: 20140100637
    Abstract: Active rejection techniques are used to cancel MRI gradient signals in an implantable medical device. An active component placed in an input channel of the implantable medical device actively rejects MRI gradient signals received on the input channel. A sensing circuit that senses an external MRI gradient signal generates a control signal that controls the active component. For example, the control signal may be the inverse of the external MRI gradient signal. An active component that receives an input signal including a desired signal component (e.g., a cardiac signal) and an undesired MRI gradient signal component may thus use this control signal to reject the undesired MRI gradient signal component.
    Type: Application
    Filed: October 10, 2012
    Publication date: April 10, 2014
    Applicant: PACESETTER, INC.
    Inventors: Jin Zhang, Erno Klaassen
  • Patent number: 7872394
    Abstract: In certain embodiments, a MEMS actuator is provided comprising a frame and a movable structure coupled to the frame. A vertical comb drive is provided between the frame and the movable structure to actuate the movable structure.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: January 18, 2011
    Inventors: John Gritters, Christopher A. Bang, Erno Klaassen, Li Fan, Richard Chen, Hsin-Chih Yeh, Ezekiel John Joseph Kruglick
  • Patent number: 7545228
    Abstract: A method for generating a temperature-compensated timing signal that includes counting, within an update interval, a first number of oscillations of a first micro-electromechanical (MEMS) resonator, a second number of oscillations of a second MEMS resonator and a third number of oscillations of a digitally controlled oscillator (DCO), computing a target DCO count based on the first number and second number of oscillations, computing a loop error signal based on the target DCO count and the third number of oscillations, and modifying an output frequency of a temperature-dependent (DCO) timing signal based on the loop error signal. The duration of the update interval may also be modified based on temperature conditions, and the update interval may also be interrupted and the output frequency immediately adjusted, if a significant temperature change is detected. Thus, dynamic and precise temperature compensation is achieved that accommodates constant, slowly changing, and rapidly changing temperature conditions.
    Type: Grant
    Filed: September 12, 2007
    Date of Patent: June 9, 2009
    Assignee: SiTime Inc.
    Inventors: Crist Lu, Erno Klaassen, Sathi Perumal
  • Patent number: 7489017
    Abstract: A fixed parallel plate micro-mechanical systems (MEMS) based sensor is fabricated to allow a dissolved dielectric to flow through a porous top plate, coming to rest on a bottom plate. A post-deposition bake ensures further purity and uniformity of the dielectric layer. In one embodiment, the dielectric is a polymer. In one embodiment, a support layer is deposited onto the top plate for strengthening the sensor. In another embodiment, the bottom plate is dual-layered for a narrowed gap. Integrated circuit arrays of such sensors can be made, having multiple devices separated from each other by a physical barrier, such as a polycrystalline containment rim or trough, for preventing polymer material from one sensor from interfering with that of another.
    Type: Grant
    Filed: October 2, 2006
    Date of Patent: February 10, 2009
    Assignee: Xsilogy Inc.
    Inventors: Sanjay V. Patel, Bernd Fruhberger, Erno Klaassen, Todd E. Mlsna, David R. Baselt
  • Patent number: 7393740
    Abstract: A fixed parallel plate micro-mechanical systems (MEMS) based sensor is fabricated to allow a dissolved dielectric to flow through a porous top plate, coming to rest on a bottom plate. A post-deposition bake ensures further purity and uniformity of the dielectric layer. In one embodiment the dielectric is a polymer. In one embodiment, a support layer is deposited onto the top plate for strengthening the sensor. In another embodiment, the bottom plate is dual-layered for a narrowed gap. Integrated circuit arrays of such sensors can be made, having multiple devices separated from each other by a physical barrier, such as a polycrystalline containment rim or trough, for preventing polymer material from one sensor from interfering with that of another.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: July 1, 2008
    Assignee: Xsilogy Inc.
    Inventors: Sanjay V. Patel, Bernd Fruhberger, Erno Klaassen, Todd E. Mlsna, David R. Baselt
  • Publication number: 20070264741
    Abstract: A fixed parallel plate micro-mechanical systems (MEMS) based sensor is fabricated to allow a dissolved dielectric to flow through a porous top plate, coming to rest on a bottom plate. A post-deposition bake ensures further purity and uniformity of the dielectric layer. In one embodiment the dielectric is a polymer. In one embodiment, a support layer is deposited onto the top plate for strengthening the sensor. In another embodiment, the bottom plate is dual-layered for a narrowed gap. Integrated circuit arrays of such sensors can be made, having multiple devices separated from each other by a physical barrier, such as a polycrystalline containment rim or rough, for preventing polymer material from one sensor from Interfering with that of another.
    Type: Application
    Filed: March 20, 2007
    Publication date: November 15, 2007
    Inventors: Sanjay Patel, Bernd Fruhberger, Erno Klaassen, Todd Misna, David Baselt
  • Publication number: 20070194406
    Abstract: A fixed parallel plate micro-mechanical systems (MEMS) based sensor is fabricated to allow a dissolved dielectric to flow through a porous top plate, coming to rest on a bottom plate. A post-deposition bake ensures further purity and uniformity of the dielectric layer. In one embodiment, the dielectric is a polymer. In one embodiment, a support layer is deposited onto the top plate for strengthening the sensor. In another embodiment, the bottom plate is dual-layered for a narrowed gap. Integrated circuit arrays of such sensors can be made, having multiple devices separated from each other by a physical barrier, such as a polycrystalline containment rim or trough, for preventing polymer material from one sensor from interfering with that of another.
    Type: Application
    Filed: October 2, 2006
    Publication date: August 23, 2007
    Applicant: Xsilogy, Inc.
    Inventors: Sanjay Patel, Bernd Fruhberger, Erno Klaassen, Todd Mlsna, David Baselt
  • Patent number: 7115969
    Abstract: A fixed parallel plate micro-mechanical systems (MEMS) based sensor is fabricated to allow a dissolved dielectric to flow through a porous top plate, coming to rest on a bottom plate. A post-deposition bake ensures further purity and uniformity of the dielectric layer. In one embodiment, the dielectric is a polymer. In one embodiment, a support layer is deposited onto the top plate for strengthening the sensor. In another embodiment, the bottom plate is dual-layered for a narrowed gap. Integrated circuit arrays of such sensors can be made, having multiple devices separated from each other by a physical barrier, such as a polycrystalline containment rim or trough, for preventing polymer material from one sensor from interfering with that of another.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: October 3, 2006
    Assignee: Xsilogy, Inc.
    Inventors: Sanjay V. Patel, Bernd Fruhberger, Erno Klaassen, Todd E. Misna, David R. Baselt
  • Patent number: 6977511
    Abstract: A sensor for determining the presence of an analyte is disclosed comprising a reactive layer disposed between a base plate and a movable plate. The reactive layer is configured to interact with an analyte effecting a change in capacitance between the base plate and movable plate. When the analyte has a polarity or overall Hildebrand solubility parameter that is similar to the reactive layer, the change in capacitance is caused by a swelling of the reactive layer as analyte is absorbed into the reactive layer. This results in a decrease in capacitance. When the analyte has a solubility parameter not near the reactive layer, the absorbed analyte causes the reactive layer's total polarity to increase, an effect that dominates swelling. This causes an increase in capacitance. A capacitive sensing circuit is included for measuring the change in capacitance which is indicative of the analyte exposed to the sensor.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: December 20, 2005
    Assignee: Xsilogy, Inc
    Inventors: Sanjay V. Patel, Bernd Fruhberger, Robert J. Warmack, Todd E. Mlsna, David R. Baselt, Erno Klaassen