Patents by Inventor David R. MacGibbon

David R. MacGibbon 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).

  • Measurement of a blood flow rate in hemodialysis shunts
    Patent number: 7473371
    Abstract: The measurement of blood flow in a dialysis shunt is obtained by injection of an indicator material into a venous line leading from dialysis equipment to the shunt. The blood flow in an arterial line leading from the shunt at a location downstream of the venous line to the dialysis equipment is monitored by an arterial line sensor for the presence of the indicator material. A detector connected to the sensor provides a dilution curve in response to the presence of the indicator material and the blood flow in the shunt is calculated from the area under the dilution curve. The locations of the arterial and venous lines in the shunt can be reversed to obtain a measurement of blood recirculation from the venous line into the arterial line.
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: January 6, 2009
    Assignee: Transonic Systems, Inc.
    Inventors: Nikolai M. Krivitski, David R. MacGibbon
  • Method and apparatus to measure blood flow in hemodialysis shunts
    Patent number: 7297280
    Abstract: The measurement of blood flow in a dialysis shunt is obtained by injection of an indicator material into a venous line leading from dialysis equipment to the shunt. The blood flow in an arterial line leading from the shunt at a location downstream of the venous line to the dialysis equipment is monitored by an arterial line sensor for the presence of the indicator material. A detector connected to the sensor provides a dilution curve in response to the presence of the indicator material and the blood flow in the shunt is calculated from the area under the dilution curve. The locations of the arterial and venous lines in the shunt can be reversed to obtain a measurement of blood recirculation from the venous line into the arterial line.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: November 20, 2007
    Assignee: Transonic Systems, Inc.
    Inventors: Nikolai M. Krivitski, David R. MacGibbon
  • Method to measure blood flow and recirculation in hemodialysis shunts
    Patent number: 6926838
    Abstract: The measurement of blood flow in a dialysis shunt is obtained by injection of an indicator material into a venous line leading from dialysis equipment to the shunt. The blood flow in an arterial line leading from the shunt at a location downstream of the venous line to the dialysis equipment is monitored by an arterial line sensor for the presence of the indicator material. A detector connected to the sensor provides a dilution curve in response to the presence of the indicator material and the blood flow in the shunt is calculated from the area under the dilution curve. The locations of the arterial and venous lines in the shunt can be reversed to obtain a measurement of blood recirculation from the venous line into the arterial line.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: August 9, 2005
    Assignee: Transonic Systems, Inc.
    Inventors: Nikolai M. Krivitski, David R. MacGibbon
  • Method and apparatus to measure blood flow and recirculation in hemodialysis shunts
    Patent number: 5685989
    Abstract: The measurement of blood flow in a dialysis shunt is obtained by injection of an indicator material into a venous line leading from dialysis equipment to the shunt. The blood flow in an arterial line leading from the shunt at a location downstream of the venous line to the dialysis equipment is monitored by an arterial line sensor for the presence of the indicator material. A detector connected to the sensor provides a dilution curve in response to the presence of the indicator material and the blood flow in the shunt is calculated from the area under the dilution curve. The locations of the arterial and venous lines in the shunt can be reversed to obtain a measurement of blood recirculation from the venous line into the arterial line.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: November 11, 1997
    Assignee: Transonic Systems, Inc.
    Inventors: Nikolai M. Krivitski, David R. MacGibbon