Patents by Inventor Christopher Ambri

Christopher Ambri 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).

  • Implantable infusion device having voltage boost circuit and selection circuit to alternately connect battery with charging circuit
    Patent number: 9555188
    Abstract: An implantable infusion device includes a pump, a charge storage unit, and a charging circuit configured to supply current to the charge storage unit from a battery in preparation for actuating the pump. The implantable infusion device also includes a pump actuator circuit configured to actuate the pump using energy from the charge storage unit, and a voltage boost circuit configured to provide a boosted battery voltage generated from the battery. The charging circuit is configured to supply current to the charge storage unit from the voltage boost circuit instead of directly from the battery in response to (i) a comparison of a voltage of the battery with a predetermined threshold and (ii) a comparison of a voltage of the charge storage unit with the voltage of the battery.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: January 31, 2017
    Assignee: Medtronic, Inc.
    Inventors: Scott A. Sarkinen, Christopher Ambri, Charles Randall Rogers, Naveed Alam
  • Implantable infusion device having selective voltage boost circuit with charge pump circuit for generating control signals using first and second profiles
    Patent number: 9556860
    Abstract: An implantable infusion device includes a voltage boost circuit configured to selectively generate an output voltage from a first voltage provided by a battery. The voltage boost circuit includes a signal generation circuit configured to generate control signals and a charge pump circuit configured to generate the output voltage in response to the control signals. In response to a request for a predetermined voltage, the signal generation circuit generates the control signals using a first profile for a first period of time, and generates the control signals using a second profile for a second period of time subsequent to the first period. The charge pump circuit increases the output voltage to (i) an intermediate voltage less than the predetermined voltage in response to the first profile of the control signals, and (ii) the predetermined voltage in response to the second profile of the control signals.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: January 31, 2017
    Assignee: Medtronic, Inc.
    Inventors: Charles Randall Rogers, Christopher Ambri
  • Charge Pump Sequencing for Minimizing In-Rush Current
    Publication number: 20130289538
    Abstract: An implantable infusion device includes a voltage boost circuit configured to selectively generate an output voltage from a first voltage provided by a battery. The voltage boost circuit includes a signal generation circuit configured to generate control signals and a charge pump circuit configured to generate the output voltage in response to the control signals. In response to a request for a predetermined voltage, the signal generation circuit generates the control signals using a first profile for a first period of time, and generates the control signals using a second profile for a second period of time subsequent to the first period. The charge pump circuit increases the output voltage to (i) an intermediate voltage less than the predetermined voltage in response to the first profile of the control signals, and (ii) the predetermined voltage in response to the second profile of the control signals.
    Type: Application
    Filed: April 27, 2012
    Publication date: October 31, 2013
    Applicant: Medtronic, Inc.
    Inventors: Charles Randall Rogers, Christopher Ambri
  • Power Management System for a Piston-Based Implantable Infusion Pump
    Publication number: 20130289539
    Abstract: An implantable infusion device includes a pump, a charge storage unit, and a charging circuit configured to supply current to the charge storage unit from a battery in preparation for actuating the pump. The implantable infusion device also includes a pump actuator circuit configured to actuate the pump using energy from the charge storage unit, and a voltage boost circuit configured to provide a boosted battery voltage generated from the battery. The charging circuit is configured to supply current to the charge storage unit from the voltage boost circuit instead of directly from the battery in response to (i) a comparison of a voltage of the battery with a predetermined threshold and (ii) a comparison of a voltage of the charge storage unit with the voltage of the battery.
    Type: Application
    Filed: April 27, 2012
    Publication date: October 31, 2013
    Applicant: Medtronic, Inc.
    Inventors: Scott A. Sarkinen, Christopher Ambri, Charles Randall Rogers, Naveed Alam