System and method for adaptive high frequency flow interrupter control in a patient respiratory ventilator

Abstract

A method and system for controlling fluid flow settings by receiving a precondition pressure wave function, representative of a precondition frequency, a precondition amplitude and a precondition pressure of the fluid flow in the system, establishing an operating pressure wave function, representative of an operating frequency, an operating amplitude and an operating pressure of the fluid flow desired in the system, determining cycle error between the precondition pressure wave function and the operating pressure wave function, converting the cycle error to flow adjustment, and updating an operating flow with the flow adjustment.

What is claimed is: 
     
         1 . An adaptive flow adjustment control system, comprising:
 a cycle error measurement unit configured to couple to a ventilator and to determine a cycle error between a precondition pressure wave function and an operating pressure wave function; and   an error to flow learning unit configured to convert the cycle error to a flow adjustment for use in adjusting an operating flow.   
     
     
         2 . An adaptive high frequency flow interrupter control system comprising the adaptive flow adjustment control system of  claim 1 , the adaptive high frequency flow interrupter control system further comprising:
 a servo control system configured to generate control signals for adjusting the operating flow based on the flow adjustment.   
     
     
         3 . The adaptive high frequency flow interrupter control system of  claim 2 , wherein the adaptive high frequency flow interrupter control system further comprises:
 the ventilator, wherein the ventilator is configured to receive the control signals from the servo control system; and   a patient circuit fluidly coupled to the ventilator and configured to allow circulation of inspiratory and expiratory gasses between the ventilator and a patient.   
     
     
         4 . The adaptive high frequency flow interrupter control system of  claim 3 , wherein the ventilator is configured to be operated independently of the adaptive flow adjustment control system if an adaptive high frequency flow interrupter control mode of the adaptive high frequency flow interrupter system is disabled. 
     
     
         5 . The adaptive high frequency flow interrupter control system of  claim 2 , wherein the servo control system comprises:
 a flow servo controller configured to regulate fluid flow; and   a pressure servo controller configured to regulate fluid pressure;   
     
     
         6 . The adaptive flow adjustment control system of  claim 1 , wherein the cycle error measurement unit is further configured to:
 receive the precondition pressure wave function; and   determine the operating pressure wave function based on an operating frequency, an operating amplitude and an operating pressure.   
     
     
         7 . The adaptive flow adjustment control system of  claim 1 , wherein the error to flow learning unit is configured to convert the cycle error to the flow adjustment based on a pressure overshoot, a pressure undershoot, or a pressure error captured when a peak operating pressure target is commanded. 
     
     
         8 . A method, comprising:
 with a cycle error measurement unit of an adaptive high frequency flow interrupter control system that is coupled to a ventilator, determining a cycle error between a precondition pressure wave function and an operating pressure wave function; and   with an error to flow learning unit of the adaptive high frequency flow interrupter control system, converting the cycle error to a flow adjustment to adjust an operating flow.   
     
     
         9 . The method of  claim 8 , further comprising:
 with a servo control system, generating control signals for adjusting the operating flow based on the flow adjustment.   
     
     
         10 . The method of  claim 9 , further comprising:
 with a ventilator, receiving the control signals from the servo control system.   
     
     
         11 . The method of  claim 10 , further comprising:
 determining that an adaptive high frequency flow interrupter control mode is disabled; and   operating the ventilator independently of the adaptive high frequency flow interrupter control system in response to determining that the adaptive high frequency flow interrupter control mode is disabled.   
     
     
         12 . The method of  claim 9 , further comprising:
 regulating fluid flow with a flow servo controller of the servo control system; and   regulating fluid pressure with a pressure servo controller of the servo control system.   
     
     
         13 . The method of  claim 8 , further comprising:
 with the cycle error measurement unit, receiving the precondition pressure wave function; and   with the cycle error measurement unit, determining the operating pressure wave function based on an operating frequency, an operating amplitude and an operating pressure.   
     
     
         14 . The method of  claim 8 , wherein converting the cycle error to the flow adjustment comprises converting the cycle error to the flow adjustment based on a pressure overshoot, a pressure undershoot, or a pressure error captured when a peak operating pressure target is commanded. 
     
     
         15 . A cycle error measurement unit for an adaptive high frequency flow interrupter control system coupled to a ventilator, the cycle error measurement unit comprising:
 a means for receiving a precondition pressure wave function, representative of a precondition frequency, a precondition amplitude and a precondition pressure of a fluid flow in the adaptive high frequency flow interrupter control system;   a means for establishing an operating pressure wave function, representative of an operating frequency, an operating amplitude and an operating pressure for an operating flow desired in the adaptive high frequency flow interrupter control system; and   a means for determining a cycle error between the precondition pressure wave function and the operating pressure wave function.   
     
     
         16 . The cycle error measurement unit of  claim 15 , wherein the cycle error measurement unit is configured to provide the cycle error to an error to flow learning mechanism of the adaptive high frequency flow interrupter control system. 
     
     
         17 . The cycle error measurement unit of  claim 15 , wherein the means for determining the cycle error between the precondition pressure wave function and the operating pressure wave function comprises means for converting the cycle error to the flow adjustment based on a pressure overshoot, a pressure undershoot, or a pressure error captured when a peak operating pressure target is commanded. 
     
     
         18 . The cycle error measurement unit of  claim 17 , wherein the pressure overshoot comprises an overshoot pressure relative to a maximum operating pressure target that is commanded. 
     
     
         19 . The cycle error measurement unit of  claim 18 , wherein the pressure undershoot comprises an undershoot pressure relative to a minimum operating pressure target that is commanded. 
     
     
         20 . The cycle error measurement unit of  claim 19 , further comprising a converter configured to convert the overshoot pressure to a measured percent pressure overshoot past the maximum operating pressure target.