System and method for flow triggering of breath supported ventilation
First Claim
1. A method of flow triggering of breath support ventilation to a patient supplied with a predetermined, preinspiratory, continuous flow of breathing gas from a ventilation system having a source of breathing gas, a patient breathing attachment, an exhalation valve, and a functionally open breathing gas flow path in fluid communication with said source of breathing gas, said ventilation flow path including flow sensor means for measuring flow rate of said breathing gas from said patient breathing attachment to said exhalation valve, the steps of the method comprising:
- delivering said predetermined rate of flow of said breathing gas from said source to said patient breathing attachment;
measuring said flow rate of breathing gas from said source of breathing gas to said patient breathing attachment to determine a gas supply flow rate;
measuring said flow rate of breathing gas from said patient attachment to said exhalation valve to determine an exiting gas flow rate;
determining patient inspiratory effort in said flow path by comparing said gas supply flow rate with said exiting gas flow rate, and determining a flow rate change due to patient inhalation or exhalation, thereby indicating the patient'"'"'s breathing efforts;
generating breath support in said delivered flow of gas when said flow rate change exceeds a predetermined threshold value; and
restoring delivery of said breathing gas from said source to said patient breathing attachment at said preinspiratory, continuous rate of flow before a patient'"'"'s next inspiratory effort.
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Abstract
The method for flow triggering breath supported ventilation is accomplished by providing a system comprising a source of a predetermined, preinspiratory, constant flow of breathing gas and connecting such to a patient breathing attachment. One or more flow sensors measure the gas flow rate in a flow path communicating with the patient breathing attachment, determining when inhalation from the flow path has occurred. Breath support is generated in the delivered gas flow in response to inhalation by the patient, and the predetermined, preinspiratory, continuous flow of breathing gas is reestablished prior to the patient'"'"'s next inspiratory effort. In combination with various types of breath support, the flow triggering strategy of the invention offers significant improvements in providing breath support to patients having weakened respiratory capabilities.
345 Citations
15 Claims
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1. A method of flow triggering of breath support ventilation to a patient supplied with a predetermined, preinspiratory, continuous flow of breathing gas from a ventilation system having a source of breathing gas, a patient breathing attachment, an exhalation valve, and a functionally open breathing gas flow path in fluid communication with said source of breathing gas, said ventilation flow path including flow sensor means for measuring flow rate of said breathing gas from said patient breathing attachment to said exhalation valve, the steps of the method comprising:
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delivering said predetermined rate of flow of said breathing gas from said source to said patient breathing attachment; measuring said flow rate of breathing gas from said source of breathing gas to said patient breathing attachment to determine a gas supply flow rate; measuring said flow rate of breathing gas from said patient attachment to said exhalation valve to determine an exiting gas flow rate; determining patient inspiratory effort in said flow path by comparing said gas supply flow rate with said exiting gas flow rate, and determining a flow rate change due to patient inhalation or exhalation, thereby indicating the patient'"'"'s breathing efforts; generating breath support in said delivered flow of gas when said flow rate change exceeds a predetermined threshold value; and restoring delivery of said breathing gas from said source to said patient breathing attachment at said preinspiratory, continuous rate of flow before a patient'"'"'s next inspiratory effort. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system of flow triggering breath support ventilation to a patient supplied with a predetermined, preinspiratory, continuous flow of breathing gas, comprising a ventilation system having a source of breathing gas, a patient breathing attachment, an exhalation valve, and a functionally open breathing gas flow path in fluid communication with said source of breathing gas, said patient breathing attachment and said exhalation valve, and flow sensor means for measuring flow rate of said breathing gas from said patient breathing attachment to said exhalation valve, the system further comprising:
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means for delivering said breathing gas from said source to said patient breathing attachment at said predetermined, continuous rate of flow; flow sensor means in said flow path for measuring flow rate of said breathing gas from said source of breathing gas to said patient breathing attachment to determine a gas supply flow rate, and for measuring flow rate of said breathing gas from said patient breathing attachment to said exhalation valve to determine an exiting gas flow rate; means responsive to said flow sensor means for determining patient breathing efforts by comparing said gas supply flow rate with said exiting gas flow rate to determine a flow rate change due to patient inhalation or exhalation efforts, means for generating breath support in said delivered flow of gas when said flow rate change exceeds a predetermined threshold value; and means for restoring delivery of said breathing gas from said source to said patient breathing attachment at said preinspiratory, continuous rate of flow before a next patient'"'"'s inspiratory effort. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification