INVERSION-BASED FEED-FORWARD COMPENSATION OF INSPIRATORY TRIGGER DYNAMICS IN MEDICAL VENTILATORS
First Claim
1. A ventilator, comprising:
- a pneumatic system for providing and receiving breathing gas;
a controller operatively coupled with the pneumatic system; and
an operator interface, where the controller is operable to;
execute a control scheme to command the pneumatic system to provide pressure assistance to a patient during inspiration, where such pressure assistance is provided in response to the ventilator detecting that the patient is attempting to initiate inspiration; and
command delivery of additional breathing gas to the patient during inspiration, where such addition is commanded in response to operator selection of at least one of a ventilator parameter and a patient parameter at the operator interface.
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Accused Products
Abstract
A ventilator and method of ventilator control. The ventilator includes a pneumatic system for providing and receiving breathing gas, and a controller operatively coupled with the pneumatic system. The controller employs closed-loop control to provide positive breathing assistance to a patient. Supplemental feed-forward compensatory assistance is also provided, in addition to and independently of that commanded by the closed-loop control. The supplemental assistance may be determined, set or selected based on a ventilator parameter and/or an operator parameter, and/or as an automatic ongoing compensatory mechanism responding to varying patient respiratory demand.
224 Citations
23 Claims
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1. A ventilator, comprising:
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a pneumatic system for providing and receiving breathing gas; a controller operatively coupled with the pneumatic system; and an operator interface, where the controller is operable to; execute a control scheme to command the pneumatic system to provide pressure assistance to a patient during inspiration, where such pressure assistance is provided in response to the ventilator detecting that the patient is attempting to initiate inspiration; and command delivery of additional breathing gas to the patient during inspiration, where such addition is commanded in response to operator selection of at least one of a ventilator parameter and a patient parameter at the operator interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A ventilator, comprising:
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a pneumatic system for providing and receiving breathing gas; and a controller operatively coupled with the pneumatic system, where the controller is operable to; receive a baseline closed-loop input corresponding to a desired output pressure of breathing gas from the pneumatic system; receive an additional feed-forward input corresponding to a desired boost pressure waveform to be added to the desired output pressure, the additional feed-forward input being dependent upon at least one of an operator-selected ventilator parameter and an operator-selected patient parameter; detect patient initiation of an inspiratory phase of a respiration cycle; and during the inspiratory phase, command the pneumatic system to provide positive pressure breathing assistance based on the closed-loop input and the additional feed-forward input, the positive pressure breathing assistance being constrained through application of a feedback signal to the controller. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of operating a patient-triggered, positive pressure ventilator, comprising:
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driving a pneumatic system of the ventilator with a closed-loop control regime to provide positive pressure breathing assistance during inspiration; providing a supplemental added pressure boost during inspiration in addition to the breathing assistance commanded by the closed-loop control regime; and setting the supplemental added pressure boost based on operator input of at least one of a ventilator parameter and a patient parameter. - View Dependent Claims (22, 23)
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Specification