Patents by Inventor David L. Canfield

David L. Canfield 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: 9719505
    Abstract: A medication pump test device and method of use including a test device for use with a medication pump and a depth indicator, the test device including: an external body portion defining a depth indicator recess operable to receive the fixed portion of the depth indicator; an internal body portion attached to the external body portion, the internal body portion defining a slide spindle passage operable to allow free axial movement of the slide spindle of the depth indicator. The test device maintains the fixed portion of the depth indicator at a fixed axial position along the central axis relative to the medication pump when the fixed portion of the depth indicator is seated in the depth indicator recess, the external contact portion contacts the medication pump, and the internal body portion is seated in the open end of the reservoir compartment.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: August 1, 2017
    Assignee: MEDTRONIC MINIMED, INC.
    Inventors: Matthew A. Weiner, David L. Canfield, Carl A. Link, Edward C. Morrow
  • Publication number: 20160290333
    Abstract: A medication pump test device and method of use including a test device for use with a medication pump and a depth indicator, the test device including: an external body portion defining a depth indicator recess operable to receive the fixed portion of the depth indicator; an internal body portion attached to the external body portion, the internal body portion defining a slide spindle passage operable to allow free axial movement of the slide spindle of the depth indicator. The test device maintains the fixed portion of the depth indicator at a fixed axial position along the central axis relative to the medication pump when the fixed portion of the depth indicator is seated in the depth indicator recess, the external contact portion contacts the medication pump, and the internal body portion is seated in the open end of the reservoir compartment.
    Type: Application
    Filed: June 14, 2016
    Publication date: October 6, 2016
    Inventors: Matthew A. Weiner, David L. Canfield, Carl A. Link, Edward C. Morrow
  • Patent number: 9388805
    Abstract: A medication pump test device and method of use including a test device for use with a medication pump and a depth indicator, the test device including: an external body portion defining a depth indicator recess operable to receive the fixed portion of the depth indicator; an internal body portion attached to the external body portion, the internal body portion defining a slide spindle passage operable to allow free axial movement of the slide spindle of the depth indicator. The test device maintains the fixed portion of the depth indicator at a fixed axial position along the central axis relative to the medication pump when the fixed portion of the depth indicator is seated in the depth indicator recess, the external contact portion contacts the medication pump, and the internal body portion is seated in the open end of the reservoir compartment.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: July 12, 2016
    Assignee: MEDTRONIC MINIMED, INC.
    Inventors: Matthew A. Weiner, David L. Canfield, Carl A. Link, Edward C. Morrow
  • Publication number: 20150267698
    Abstract: A medication pump test device and method of use including a test device for use with a medication pump and a depth indicator, the test device including: an external body portion defining a depth indicator recess operable to receive the fixed portion of the depth indicator; an internal body portion attached to the external body portion, the internal body portion defining a slide spindle passage operable to allow free axial movement of the slide spindle of the depth indicator. The test device maintains the fixed portion of the depth indicator at a fixed axial position along the central axis relative to the medication pump when the fixed portion of the depth indicator is seated in the depth indicator recess, the external contact portion contacts the medication pump, and the internal body portion is seated in the open end of the reservoir compartment.
    Type: Application
    Filed: March 24, 2014
    Publication date: September 24, 2015
    Applicant: Medtronic MiniMed, Inc.
    Inventors: Matthew A. Weiner, David L. Canfield, Carl A. Link, Edward C. Morrow
  • Publication number: 20100305551
    Abstract: A drug-delivery unit suitable for implantation into a patient body may include a valveless impedance pump. In some implementations the unit may include an actuator, control electronics and a battery, and may communicate with an external patient interface unit. The patient interface unit can be used to control operation of the implant and to download data from the implant. The patient interface unit can also be used to charge the implant and/or a separate charger can be used. In other implementations, a drug-delivery implant unit may lack internal electronics and instead rely on an externally-supplied magnetic field to actuate the pump.
    Type: Application
    Filed: June 4, 2010
    Publication date: December 2, 2010
    Applicant: NEUROSYSTEC CORP.
    Inventors: Thomas J. Lobl, Jacob E. Pananen, David L. Canfield, Anna I. Nagy, Adrian L. Krag
  • Publication number: 20090209945
    Abstract: A drug-delivery unit suitable for implantation into a patient body may include a valveless impedance pump. In some implementations the unit may include an actuator, control electronics and a battery, and may communicate with an external patient interface unit. The patient interface unit can be used to control operation of the implant and to download data from the implant. The patient interface unit can also be used to charge the implant and/or a separate charger can be used. In other implementations, a drug-delivery implant unit may lack internal electronics and instead rely on an externally-supplied magnetic field to actuate the pump.
    Type: Application
    Filed: January 19, 2009
    Publication date: August 20, 2009
    Applicant: NEUROSYSTEC CORPORATION
    Inventors: Thomas J. Lobl, Jacob E. Pananen, David L. Canfield, Anna I. Nagy, Adrian L. Krag
  • Patent number: 7239921
    Abstract: A housing for an implantable medical device in the shape of a hollow magnetic field concentrating tube about which an electrically conductive wire coil is wound and within which medical device electronics is housed. The tube, preferably made of ferrite, is encased in a protective sleeve formed of a material that is impervious to body fluids. The coil provides an electrical output as a result of being exposed to a varying magnetic field that is concentrated around the coil by virtue of the field concentrating tube. The output of the coil is utilized as part of a power supply for the medical device electronics. The sleeve has a generally cylindrical cross-section having an outside diameter of about 3.175 mm and an axial length in the range of about 3.2 mm to 8 mm.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: July 3, 2007
    Assignee: Alfred E. Mann Foundation for Scientific Research
    Inventors: David L. Canfield, Kate E. Purnell
  • Patent number: 7024249
    Abstract: A magnetic control system for selectively enabling/disabling an implantable device's operation using externally applied pulsed magnetic means, e.g., a controlled electromagnet or the like. Typically, such implantable devices stimulate a neural pathway or muscle and/or block pain or muscle stimulation according to programmable settings. Preferably, once programmed from an external programmer, such implantable devices can operate “independently” using the externally provided programmed information. However, in certain circumstances, it may be desired to stop/pause the operation of such selected implanted device while not affecting other such devices. Accordingly, embodiments of the present invention include a magnetic sensor, preferably a magnetoresistive, Hall effect, saturated core reactors, or the like, to sense an externally provided magnetic field. By externally applying pulsed magnetic fields in sequences of controlled polarities, durations, intensities, etc.
    Type: Grant
    Filed: February 21, 2002
    Date of Patent: April 4, 2006
    Assignee: Alfred E. Mann Foundation for Scientific Research
    Inventors: Ralph M. Weisner, David L. Canfield, Richard J. Nelson, Joseph H. Schulman
  • Patent number: 6935897
    Abstract: A connector (1) and method of making electrical connection between an electrical conductor (7, 11) and a removable electrical device (2). The connector (7, 11) is an elastic material, such as silicone, that is both compatible with the environment and is an electrical insulator. It forces contact between the electrical device (2) and integral contacts (10, 13) in the connector (1) by virtue of its elasticity. The electrodes (4, 6) and the electrical connections are protected from the environment to avoid electrical leakage or corrosion of the electrodes (4, 6).
    Type: Grant
    Filed: January 16, 2004
    Date of Patent: August 30, 2005
    Assignee: Alfred E. Mann Foundation for Scientific Research
    Inventors: David L. Canfield, Charles L. Byers, Gary D. Schnittgrund
  • Publication number: 20040260372
    Abstract: A housing for an implantable medical device in the shape of a hollow magnetic field concentrating tube about which an electrically conductive wire coil is wound and within which medical device electronics is housed. The tube, preferably made of ferrite, is encased in a protective sleeve formed of a material that is impervious to body fluids. The coil provides an electrical output as a result of being exposed to a varying magnetic field that is concentrated around the coil by virtue of the field concentrating tube. The output of the coil is utilized as part of a power supply for the medical device electronics. The sleeve has a generally cylindrical cross-section having an outside diameter of about 3.175 mm and an axial length in the range of about 3.2 mm to 8 mm.
    Type: Application
    Filed: June 23, 2003
    Publication date: December 23, 2004
    Inventors: David L. Canfield, Kate E. Purnell
  • Patent number: 6829508
    Abstract: An electrically sensing and stimulating outer sheath for ensuring accurate surgical placement of a microsensor or a microstimulator near a nerve in living tissue is disclosed. The electrically sensing outer sheath may also be used to verify the function of the microstimulator or microsensor during surgical placement but before the outer sheath is removed. In the event that the microstimulator is not optimally placed near the nerve, or if the microstimulator is malfunctioning, this can be determined prior to removal of the outer sheath, thus reducing the possibility of nerve or tissue damage that might be incurred during a separate operation to remove the microstimulator.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: December 7, 2004
    Assignee: Alfred E. Mann Foundation for Scientific Research
    Inventors: Joseph H. Schulman, Ralph M. Weisner, David L. Canfield, Kate E. Fey, Charles L. Byers
  • Patent number: 6821154
    Abstract: A connector and method of making electrical connection between an electrical conductor and a removable electrical device. The connector is an elastic material, such as silicone, that is both compatible with the environment and is an electrical insulator. It forces contact between the electrical device and integral contacts in the connector by virtue of its elasticity. The electrodes and the connections are protected from the environment to avoid electrical leakage or corrosion of the electrodes.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: November 23, 2004
    Assignee: Alfred E. Mann Foundation for Scientific Research
    Inventors: David L. Canfield, Charles L. Byers
  • Publication number: 20030167078
    Abstract: A magnetic control system for selectively enabling/disabling an implantable device's operation using externally applied pulsed magnetic means, e.g., a controlled electromagnet or the like. Typically, such implantable devices stimulate a neural pathway or muscle and/or block pain or muscle stimulation according to programmable settings. Preferably, once programmed from an external programmer, such implantable devices can operate “independently” using the externally provided programmed information. However, in certain circumstances, it may be desired to stop/pause the operation of such selected implanted device while not affecting other such devices. Accordingly, embodiments of the present invention include a magnetic sensor, preferably a magnetoresistive, Hall effect, saturated core reactors, or the like, to sense an externally provided magnetic field. By externally applying pulsed magnetic fields in sequences of controlled polarities, durations, intensities, etc.
    Type: Application
    Filed: February 21, 2002
    Publication date: September 4, 2003
    Inventors: Ralph M. Weisner, David L. Canfield, Richard J. Nelson, Joseph H. Schulman
  • Publication number: 20030078643
    Abstract: The invention is directed to an electrically sensing and stimulating outer sheath for ensuring accurate surgical placement of a microsensor or a microstimulator near a nerve in living tissue. The electrically sensing outer sheath may also be used to verify the function of the microstimulator or microstimulator during surgical placement but before the outer sheath is removed. In the event that the microstimulator is not optimally placed near the nerve, or if the microstimulator is malfunctioning, this can be determined prior to removal of the outer sheath, thus reducing the possibility of nerve or tissue damage that might be incurred during a separate operation to remove the microstimulator.
    Type: Application
    Filed: April 4, 2002
    Publication date: April 24, 2003
    Inventors: Joseph H. Schulman, Ralph M. Weisner, David L. Canfield, Kate E. Fey
  • Patent number: 4093120
    Abstract: A railroad crossing structure comprising one or more elastomeric pads which preferably have a flexible plate of a concave cross-section imbedded within them. The elastomeric pads are abutted together side-by-side and/or end-to-end to form the crossing, and the abutting edges thereof are formed with interlocking means to provide moisture-proof seams between them. The elastomeric pads are secured in place by means of rods extended longitudinally through them, with the ends of the rods being secured to anchor means.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: June 6, 1978
    Assignee: Park Rubber Company
    Inventor: David L. Canfield