Energy trigger
First Claim
Patent Images
1. A mechanical ventilator apparatus for supplying breathing gas to humans, the ventilator comprising:
- a ventilator arrangement; and
a processing unit configured to obtain flow signals from sensors indicative of at least breathing gas flow;
wherein said processing unit is arranged to analyze said flow signals with respect to kinetic energy content relating to a breathing effort of a patient by applying said flow signals to a derivative procedure in order to deduce said kinetic energy content via a calculation of ½
ρ
V2, where ρ
is a density of breathing gas and V is a speed of a breathing flow gas, and said derivative procedure further comparing an output from said derivative procedure to at least one predetermined trigger level, to trigger a response if said kinetic energy content reaches said trigger level, and to trigger at least one of an inspiratory phase or an expiratory phase of a breathing cycle using a supply of said breathing gas according to said reached trigger level.
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Abstract
A method and apparatus for facilitating breathing using a mechanical breathing gas ventilator is presented. The patient effort is deduced from a measured flow signal and analyzed with respect to the energy in the breathing system comprising the mechanical ventilator and the patient. When a predetermined energy threshold has been reached the ventilator responds to the breathing pattern change.
19 Citations
12 Claims
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1. A mechanical ventilator apparatus for supplying breathing gas to humans, the ventilator comprising:
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a ventilator arrangement; and a processing unit configured to obtain flow signals from sensors indicative of at least breathing gas flow; wherein said processing unit is arranged to analyze said flow signals with respect to kinetic energy content relating to a breathing effort of a patient by applying said flow signals to a derivative procedure in order to deduce said kinetic energy content via a calculation of ½
ρ
V2, where ρ
is a density of breathing gas and V is a speed of a breathing flow gas, and said derivative procedure further comparing an output from said derivative procedure to at least one predetermined trigger level, to trigger a response if said kinetic energy content reaches said trigger level, and to trigger at least one of an inspiratory phase or an expiratory phase of a breathing cycle using a supply of said breathing gas according to said reached trigger level. - View Dependent Claims (2, 3, 4)
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5. A method for facilitating breathing in connection with a mechanical ventilator arrangement, comprising the steps of:
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acquiring a breathing gas flow signal; processing said breathing gas flow signal for kinetic energy content by applying said breathing gas flow signal to a derivative procedure to deduce said kinetic energy content relating to a breathing effort of a patient, wherein the kinetic energy content is deduced via a calculation of ½
ρ
V2, where ρ
is a density of breathing gas and V is a speed of a breathing flow gas;determining if said kinetic energy content has reached at least one predetermined trigger level by comparing an output from said derivative procedure with said trigger level; and responding to said reached trigger level by changing control signals for said mechanical ventilator, wherein said control signals trigger at least one of an inspiratory phase or an expiratory phase of a breathing cycle using a supply of breathing gas. - View Dependent Claims (6)
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7. A system for facilitating breathing when using a mechanical ventilator arrangement, comprising:
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at least one sensing means for acquiring a flow signal indicative of at least flow of breathing gas to a patient; a breathing gas tubing and breathing gas distribution means; a mechanical ventilator apparatus; and a processing unit; wherein said processing unit is arranged to process flow data obtained from a breathing gas flow measurement using said sensing means, to determine kinetic energy content relating to a breathing effort of a patient from said flow data by applying said flow signal to a derivative procedure to deduce said kinetic energy content via a calculation of ½
ρ
V2, where ρ
is a density of breathing gas and V is a speed of a breathing flow gas, and said derivative procedure further comparing an output from said derivative procedure with at least one predetermined trigger level, to determine if said predetermined trigger level is reached from said comparison, and to output control signals to said mechanical ventilator apparatus to trigger at least one of an inspiratory phase or an expiratory phase of a breathing cycle using a supply of breathing gas. - View Dependent Claims (8)
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9. A computer readable medium having instructions stored thereon that, when executed, control a mechanical ventilator apparatus, to perform a method, comprising:
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obtaining flow signals from at least one sensing means for measuring flow of breathing gas to a patient; applying said flow signals to a derivative procedure to deduce a kinetic energy content relating to a breathing effort of a patient, wherein the kinetic energy content is deduced via a calculation of ½
ρ
V2, where ρ
is a density of breathing gas and V is a speed of a breathing flow gas;comparing an output from said derivative procedure with at least one predetermined trigger level; determining from said comparison if said predetermined trigger level has been reached; and transmitting control signals to trigger at least one of an inspiratory phase or an expiratory phase of a breathing cycle using a supply of breathing gas to said mechanical ventilator if said predetermined trigger level has been reached. - View Dependent Claims (10, 11, 12)
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Specification