Patents by Inventor Fernando J. Isaza

Fernando J. Isaza 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: 6739337
    Abstract: A parameter of interest being measured by a sensor is estimated from output response data from the sensor and the known transfer function of the sensor, allowing fast and accurate sensor data from sensors having a dynamic characteristic otherwise precluding assessment of the sensor input. A parameter of breathing gas from a ventilator is determined based upon the known transfer function and a plurality of the sensor output signals at predetermined intervals of time, to provide an estimation of the parameter of interest.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: May 25, 2004
    Assignee: Nellcor Puritan Bennett Incorporated
    Inventor: Fernando J. Isaza
  • Patent number: 6668824
    Abstract: The system and method for detecting disconnection and occlusion of a tubing system of a patient ventilator detects disconnection of the tubing system, opens the exhalation valve, delivers an idle flow of breathing gas to the tubing system, disables breath triggering, and generates an alarm. A reconnection of the tubing system can also be detected, to initiate resumption of pressure supported inspiration. For occlusion detection, the pressure drop in the tubing system is determined by pressure sensors in the inspiratory and expiratory airways of the tubing system. The two pressure drop values are compared, and once occlusion is detected, an alarm is generated, and the ventilator responds to protect the patient from over distension. Abatement of the occlusion can also be monitored in a pressure based occlusion status cycling mode, and the ventilator can revert back to normal ventilation when either circuit occlusion or exhaust port occlusion are not detected.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: December 30, 2003
    Assignee: Nellcor Puritan Bennett Incorporated
    Inventors: Fernando J. Isaza, Stanley Wong, Itzhak Verona, Peter Doyle
  • Publication number: 20030192542
    Abstract: A parameter of interest being measured by a sensor is estimated from output response data from the sensor and the known transfer function of the sensor, allowing fast and accurate sensor data from sensors having a dynamic characteristic otherwise precluding assessment of the sensor input. A parameter of breathing gas from a ventilator is determined based upon the known transfer function and a plurality of the sensor output signals at predetermined intervals of time, to provide an estimation of the parameter of interest.
    Type: Application
    Filed: March 27, 2003
    Publication date: October 16, 2003
    Inventor: Fernando J. Isaza
  • Patent number: 6553991
    Abstract: A parameter of interest being measured by a sensor is estimated from output response data from the sensor and the known transfer function of the sensor, allowing fast and accurate sensor data from sensors having a dynamic characteristic otherwise precluding assessment of the sensor input. A parameter of breathing gas from a ventilator is determined based upon the known transfer function and a plurality of the sensor output signals at predetermined intervals of time, to provide an estimation of the parameter of interest.
    Type: Grant
    Filed: January 15, 1999
    Date of Patent: April 29, 2003
    Assignee: Nellcor Puritan Bennett Incorporated
    Inventor: Fernando J. Isaza
  • Patent number: 5881717
    Abstract: The system and method for detecting disconnection and occlusion of a tubing system of a patient ventilator detects disconnection of the tubing system, opens the exhalation valve, delivers an idle flow of breathing gas to the tubing system, disables breath triggering, and generates an alarm. A reconnection of the tubing system can also be detected, to initiate resumption of pressure supported inspiration. For occlusion detection, the pressure drop in the tubing system is determined by pressure sensors in the inspiratory and expiratory airways of the tubing system. The two pressure drop values are compared, and once occlusion is detected, an alarm is generated, and the ventilator responds to protect the patient from over distension. Abatement of the occlusion can also be monitored in a pressure based occlusion status cycling mode, and the ventilator can revert back to normal ventilation when either circuit occlusion or exhaust port occlusion are not detected.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: March 16, 1999
    Assignee: Nellcor Puritan Bennett Incorporated
    Inventor: Fernando J. Isaza
  • Patent number: 5865168
    Abstract: A parameter of interest being measured by a sensor is estimated from output response data from the sensor and the known transfer function of the sensor, allowing fast and accurate sensor data from sensors having a dynamic characteristic otherwise precluding assessment of the sensor input. A parameter of breathing gas from a ventilator is determined based upon the known transfer function and a plurality of the sensor output signals at predetermined intervals of time, to provide an estimation of the parameter of interest.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: February 2, 1999
    Assignee: Nellcor Puritan Bennett Incorporated
    Inventor: Fernando J. Isaza
  • Patent number: 5813399
    Abstract: The method and system for controlling airway pressure in a ventilator during the inspiratory cycle involves controlling the flow of breathing gas through a flow supply valve venting the breathing gas at a desired rate of outflow through a relief valve to achieve the desired airway pressure. Measurements of the rates of actual supply flow, the actual outflow through the exhalation/relief valve, and the pressure in the airway are compared with desired values for determination the amount of error for feedback control of the ventilator system.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: September 29, 1998
    Assignee: Puritan Bennett Corporation
    Inventors: Fernando J. Isaza, Stanley Y. Wong
  • Patent number: 5319540
    Abstract: The present invention provides a system and method for providing a correction to a flow control signal to a flow control valve in a ventilator system. The correction component sums the errors in the flow rate actually delivered as compared with the desired flow rate for each control interval in a breath with the sum of past errors corresponding to control intervals in past breaths to generate a corrected command flow signal to the flow control valve.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: June 7, 1994
    Assignee: Puritan-Bennett Corporation
    Inventors: Fernando J. Isaza, Stanley Y. Wong
  • Patent number: 5271389
    Abstract: The present invention provides a system and method for providing an improved correction to an input flow control signal to a flow control valve in a ventilator system. The correction as derived from a sum of the error in the flow rate actually delivered as compared with the desired flow rate for each control interval in a breath with the sum of past errors corresponding to control intervals in past breaths to generate a cumulative error signal for application in the control interval in a next breath. The cumulative error signal is stored as the sum of previous sustained errors arising periodically in the system for each control interval of previous breaths, and is integrated with the current error signal for each control interval to generate an integrated correction component signal. The input flow control signal is summed with the integrated correction component to generate a corrected command flow signal to the flow control valve.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: December 21, 1993
    Assignee: Puritan-Bennett Corporation
    Inventors: Fernando J. Isaza, Stanley Y. Wong
  • Patent number: RE39225
    Abstract: The system and method for detecting disconnection and occlusion of a tubing system of a patient ventilator detects disconnection of the tubing system, opens the exhalation valve, delivers an idle flow of breathing gas to the tubing system, disables breath triggering, and generates an alarm. A reconnection of the tubing system can also be detected, to initiate resumption of pressure supported inspiration. For occlusion detection, the pressure drop in the tubing system is determined by pressure sensors in the inspiratory and expiratory airways of the tubing system. The two pressure drop values are compared, and once occlusion is detected, an alarm is generated, and the ventilator responds to protect the patient from over distension. Abatement of the occlusion can also be monitored in a pressure based occlusion status cycling mode, and the ventilator can revert back to normal ventilation when the circuit occlusion or exhaust port occlusion are not detected.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: August 8, 2006
    Assignee: Nellcor Puritan Bennett Incorporated
    Inventors: Fernando J. Isaza, Stanley Y. Wong, Peter Doyle