Patents by Inventor Yogesh B. Gianchandani

Yogesh B. Gianchandani 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).

  • Patent number: 8638106
    Abstract: A microdischarge-based pressure sensor that includes an anode, two cathodes, a drive circuit connected to the electrodes, and a measurement circuit that permits sensing of transient current pulses flowing through at least one of the electrodes. One of the cathodes is interposed between the anode and other cathode, and it includes a central opening which permits a microdischarge to occur between the anode and each cathode in response to applied voltage pulses from the drive circuit. Changes in relative current between the two cathodes are indicative of changes in ambient pressure in the microdischarge chamber. In other embodiments, a sealed chamber can be used with one of the electrodes acting as a diaphragm which deflects based on external pressure and changes its inter-electrode spacing, thereby altering the relative cathode currents.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: January 28, 2014
    Assignee: The Regents of the University of Michigan
    Inventors: Yogesh B. Gianchandani, Scott Andrew Wright
  • Patent number: 8467867
    Abstract: A sensor is mounted to a needle at a location proximate to a tip of the needle. The sensor senses tissue density of tissue in contact with the tip as the needle passes through the tissue. Further, the sensor detects a change in tissue density as the tip passes from one tissue to a target tissue.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: June 18, 2013
    Assignee: The Regents of the University of Michigan
    Inventors: Yogesh B. Gianchandani, Tao Li, Roma Y. Gianchandani
  • Patent number: 8323246
    Abstract: A liquid delivery apparatus for the intrathecal delivery of one or more medications to a patient is disclosed. The liquid delivery apparatus generally includes a liquid reservoir, a liquid metering unit fluidly connected to the liquid reservoir, and a catheter delivery tube fluidly connected to the liquid metering unit. Preferably, the liquid delivery apparatus includes two or more liquid reservoirs. In various embodiments, the liquid reservoir includes a deformable balloon and a compressive sleeve spring as a pressure source, the liquid metering unit is a piezoelectrically actuated microvalve, and/or diagnostic sensors are included in the apparatus. The disclosed apparatus are compact, volume-efficient, energy-efficient, capable of delivering accurate fluid volumes, and address problems associated with multi-medication therapies. Methods of operating the liquid delivery apparatus are also disclosed.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: December 4, 2012
    Assignee: The Regents of the University of Michigan
    Inventors: Srinivas Chiravuri, Allan Evans, Yogesh B. Gianchandani, Jong M. Park
  • Patent number: 8235675
    Abstract: A system and method for using an element made of porous ceramic materials such as zeolite to constrain the flow of gas molecules to the free molecular or transitional flow regime. A preferred embodiment of the gas pump may include the zeolite element, a heater, a cooler, passive thermal elements, and encapsulation. The zeolite element may be further comprised of multiple types of porous matrix sub-elements, which may be coated with other materials and may be connected in series or in parallel. The gas pump may further include sensors and a control mechanism that is responsive to the output of the sensors. The control mechanism may further provide the ability to turn on and off certain heaters in order to reverse the flow in the gas pump. In one embodiment, the pump may operate by utilizing waste heat from an external system to induce transpiration driven flow across the zeolite.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: August 7, 2012
    Inventors: Yogesh B. Gianchandani, Naveen Gupta
  • Patent number: 8212552
    Abstract: A stent and a magnetoelastic resonant sensor are provided for sensor a physical characteristic in a bodily vessel or cavity. External coils interact with the sensor to induce a resonance that is responsive to the physical characteristic, such that the device may wirelessly measure physical characteristics such as mass loading effects and viscosity changes due to progression of pathology in implanted stents and stent grafts. The sensor may be fashioned from a magnetoelastic material and may be integrated near the inner sidewall of the stent. The sensor may take on a complex patterned shape to enhance the sensitivity and flexibility of the sensor structure. When the sensor is interrogated with a time-varying magnetic field, the sensor will mechanically vibrate and generate a magnetic flux which is maximum at a resonant characteristic determined by the mass load on the sensor and the viscosity of the fluid surrounding the sensor.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: July 3, 2012
    Assignee: The Regents of The University of Michigan
    Inventors: Yogesh B. Gianchandani, Scott Green, Mark Thomas Richardson
  • Patent number: 8156568
    Abstract: This invention addresses a contact mode hybrid scanning system (HSS), which can be used for measuring topography. The system consists of a cantilever or a cantilever array, a scanning stage, a light source, and instrumentation to synchronize and control the individual components. Detection of the cantilever's movement is achieved by directly measuring the change in disposition of the cantilever including its height, rotation at one or more points on the cantilever thereby providing a partial three-dimensional reconstruction without the need for actuating the cantilever. This is achieved by employing a displacement meter such as a triangulation meter or a confocal meter.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: April 10, 2012
    Assignee: Picocal, Inc.
    Inventors: Angelo Gaitas, Yogesh B. Gianchandani
  • Publication number: 20110196259
    Abstract: A sensor is mounted to a needle at a location proximate to a tip of the needle. The sensor senses tissue density of tissue in contact with the tip as the needle passes through the tissue. Further, the sensor detects a change in tissue density as the tip passes from one tissue to a target tissue.
    Type: Application
    Filed: April 18, 2011
    Publication date: August 11, 2011
    Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventors: Yogesh B. Gianchandani, Tao Li, Roma Y. Gianchandani
  • Publication number: 20110184313
    Abstract: A medical device such as a biopsy needle or probe has an integrated piezoelectric transducer. A power source is electrically coupled to the piezoelectric transducer. The power source is configured to generate a signal that causes the piezoelectric transducer to generate heat for cauterizing tissue. A signal analyzer receives a signal from the piezoelectric transducer, or from a sensor integrated into the biopsy needle or probe, to determine the extent of the cauterization.
    Type: Application
    Filed: January 20, 2011
    Publication date: July 28, 2011
    Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventors: Yogesh B. Gianchandani, Karthik Visvanathan
  • Patent number: 7927288
    Abstract: A sensor is mounted to a biopsy needle at a location proximate to a tip of the needle. The sensor senses properties of tissue in contact with the sensor and proximate to the tip.
    Type: Grant
    Filed: January 22, 2007
    Date of Patent: April 19, 2011
    Assignee: The Regents of the University of Michigan
    Inventors: Yogesh B. Gianchandani, Tao Li, Roma Y. Gianchandani
  • Patent number: 7922667
    Abstract: Disclosed herein is an electromagnetic flow sensor device for monitoring flow of fluid in a channel. The sensor device includes a first electrode to be disposed along the channel and in communication with the fluid, a second electrode to be disposed along the channel and in communication with the fluid, and a radially expandable frame to structurally support the first electrode and the second electrode while conforming to the channel to position the first electrode and the second electrode along the channel. The device may also include an antenna coupled to the first and second electrodes to wirelessly provide an indication of a voltage induced between the first and second electrodes. In some embodiments, the radially expandable frame includes an insulating link such that the first and second electrodes are not electrically connected via the radially expandable frame.
    Type: Grant
    Filed: June 6, 2005
    Date of Patent: April 12, 2011
    Assignee: The Regents of The University of Michigan
    Inventors: Yogesh B. Gianchandani, Kenichi Takahata
  • Publication number: 20110034872
    Abstract: A liquid delivery apparatus for the intrathecal delivery of one or more medications to a patient is disclosed. The liquid delivery apparatus generally includes a liquid reservoir, a liquid metering unit fluidly connected to the liquid reservoir, and a catheter delivery tube fluidly connected to the liquid metering unit. Preferably, the liquid delivery apparatus includes two or more liquid reservoirs. In various embodiments, the liquid reservoir includes a deformable balloon and a compressive sleeve spring as a pressure source, the liquid metering unit is a piezoelectrically actuated microvalve, and/or diagnostic sensors are included in the apparatus. The disclosed apparatus are compact, volume-efficient, energy-efficient, capable of delivering accurate fluid volumes, and address problems associated with multi-medication therapies. Methods of operating the liquid delivery apparatus are also disclosed.
    Type: Application
    Filed: December 8, 2008
    Publication date: February 10, 2011
    Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventors: Srinivas Chiravuri, Allan Evans, Yogesh B. Gianchandani, Jong Moon Park
  • Patent number: 7789371
    Abstract: A piezoelectric microvalve employs a valve element formed of hermetically sealed and opposed plates flexed together by a cross axis piezoelectric element. Large flow modulation with small piezoelectric actuator displacement is obtained by perimeter augmentation of the valve seat which dramatically increases the change in valve flow area for small deflections.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: September 7, 2010
    Inventors: Yogesh B. Gianchandani, Gregory Francis Nellis, Sanford A. Klein, John Moon Park, Allan Thomas Evans, Ryan Taylor, Tyler R. Brosten
  • Publication number: 20090295383
    Abstract: A stent and a magnetoelastic resonant sensor are provided for sensor a physical characteristic in a bodily vessel or cavity. External coils interact with the sensor to induce a resonance that is responsive to the physical characteristic, such that the device may wirelessly measure physical characteristics such as mass loading effects and viscosity changes due to progression of pathology in implanted stents and stent grafts. The sensor may be fashioned from a magnetoelastic material and may be integrated near the inner sidewall of the stent. The sensor may take on a complex patterned shape to enhance the sensitivity and flexibility of the sensor structure. When the sensor is interrogated with a time-varying magnetic field, the sensor will mechanically vibrate and generate a magnetic flux which is maximum at a resonant characteristic determined by the mass load on the sensor and the viscosity of the fluid surrounding the sensor.
    Type: Application
    Filed: June 1, 2009
    Publication date: December 3, 2009
    Applicant: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
    Inventors: Yogesh B. Gianchandani, Scott Green, Mark Thomas Richardson
  • Publication number: 20090175736
    Abstract: A system and method for using an element made of porous ceramic materials such as zeolite to constrain the flow of gas molecules to the free molecular or transitional flow regime. A preferred embodiment of the gas pump may include the zeolite element, a heater, a cooler, passive thermal elements, and encapsulation. The zeolite element may be further comprised of multiple types of porous matrix sub-elements, which may be coated with other materials and may be connected in series or in parallel. The gas pump may further include sensors and a control mechanism that is responsive to the output of the sensors. The control mechanism may further provide the ability to turn on and off certain heaters in order to reverse the flow in the gas pump. In one embodiment, the pump may operate by utilizing waste heat from an external system to induce transpiration driven flow across the zeolite.
    Type: Application
    Filed: January 7, 2009
    Publication date: July 9, 2009
    Inventors: Yogesh B. Gianchandani, Naveen Gupta
  • Publication number: 20080296523
    Abstract: A piezoelectric microvalve employs a valve element formed of hermetically sealed and opposed plates flexed together by a cross axis piezoelectric element. Large flow modulation with small piezoelectric actuator displacement is obtained by perimeter augmentation of the valve seat which dramatically increases the change in valve flow area for small deflections.
    Type: Application
    Filed: May 31, 2007
    Publication date: December 4, 2008
    Inventors: Yogesh B. Gianchandani, Gregory Francis Nellis, Sanford A. Klein, John Moon Park, Allan Thomas Evans, Ryan Taylor, Tyler R. Brosten
  • Patent number: 7456698
    Abstract: A mechanical self-reciprocating oscillator and mechanism and method for establishing and maintaining regular back and forth movement of a micromachined device without the aid of any electronic components are provided. The fully mechanical micromachined oscillator and mechanism are driven using only a DC power source on at least one substrate such as a semiconductor chip. The oscillator and mechanism preferably include an electrothermal actuator, that, when actuated, opens a switch to cut off supply current to the actuator. Two versions of the oscillator and mechanism are provided using distinct hysteresis mechanisms, one structural and the other thermal.
    Type: Grant
    Filed: January 20, 2005
    Date of Patent: November 25, 2008
    Assignee: The Regents of the University of Michigan
    Inventors: Yogesh B. Gianchandani, Kabir Udeshi
  • Patent number: 7452334
    Abstract: Disclosed herein is a stent device useful for maintaining the patency of a lumen while monitoring an intraluminal characteristic. The device includes a structure having a set of extendible bands that are capable of plastic deformation to form a scaffolding having an inductance, and further includes a capacitance coupled to the set of extendible bands and responsive to the intraluminal characteristic. The capacitance and the inductance form a tank circuit after the plastic deformation of the set of extendible bands to enable wireless transmission of an indication of the intraluminal characteristic.
    Type: Grant
    Filed: September 13, 2004
    Date of Patent: November 18, 2008
    Assignee: The Regents of The University of Michigan
    Inventors: Yogesh B. Gianchandani, Kenichi Takahata, Kensall D. Wise, Andrew D. DeHennis
  • Publication number: 20080108930
    Abstract: The present invention provides a system for determining blood flow rate in a vessel which communicates blood between two locations of a patient, the system comprising: a conduit in fluid communication with the vessel; at least one sensor in communication with the vessel for determining differential blood pressure (? P) between two or more locations within the vessel; and a processor operably connected to the at least one sensor for processing the ? P to obtain blood flow rate within the vessel. A method for determining blood flow rate in a vessel which communicates blood between two locations of a patient, the method comprising: diverting blood from the vessel at a diversion point to obtain a flow of diverted blood in a conduit; determining differential blood pressure (? P) of the diverted blood through the conduit; and processing the ? P to obtain blood flow rate within the vessel.
    Type: Application
    Filed: October 31, 2007
    Publication date: May 8, 2008
    Applicant: The Regents of the University of Michigan
    Inventors: William F. Weitzel, Yogesh B. Gianchandani
  • Patent number: 7367781
    Abstract: A number of micromachined devices including a micromachined pump for on-chip vacuum is provided. For example, a single-chip micromachined implementation of a Knudsen pump having one or more stages and which uses the principle of thermal transpiration with no moving parts is provided. A six-mask microfabrication process to fabricate the pump using a glass substrate and silicon wafer is shown. The Knudsen pump and two integrated pressure sensors occupy an area of 1.5 mm×2 mm. Measurements show that while operating in standard laboratory conditions, this device can evacuate a cavity to 0.46 atm using 80 mW input power. High thermal isolation is obtained between a polysilicon heater of the pump and the rest of the device.
    Type: Grant
    Filed: January 5, 2004
    Date of Patent: May 6, 2008
    Assignee: The Regents of the University of Michigan
    Inventors: Yogesh B. Gianchandani, Shamus P. McNamara
  • Patent number: 7358051
    Abstract: Disclosed herein is a method of collecting suspensions in a liquid film including the steps of developing a variation in surface tension at a gas-liquid interface of the liquid film to generate a circulating flow pattern within the liquid film, and scanning the liquid film with the circulating flow pattern for entrapment of the suspensions in the flow pattern by re-directing the variation in the surface tension across the gas-liquid interface of the liquid film.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: April 15, 2008
    Assignee: The Regents of the University of Michigan
    Inventors: Yogesh B. Gianchandani, Amar S. Basu