System and method for circuit compliance compensated pressure-regulated volume control in a patient respiratory ventilator
First Claim
1. A ventilation system, comprising:
- a ventilator operatively having an inspiratory port for supplying an inspiratory gas to a patient and an expiratory port for receiving an expiratory gas from a patient;
a patient circuit having an inspiratory limb having one end connected to the inspiratory port, an expiratory limb having one end connected to the expiratory port, and a patient piece having one end connected to the other ends of the inspiratory and expiratory limbs and the other end connected to the patient; and
a circuit compliance compensated pressure regulated volume control system, comprising a pressure-regulated volume controller operative to generate a circuit compliance pressure compensation factor based on a volume error defined as a volume differential between a set tidal volume and a volume actually delivered to the patient.
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Abstract
A system and a method for circuit compliance compensated pressure control in a patient respiratory ventilation system, having a pressure regulated feedback servo control loop, a pressure-regulated volume controller, and a patient volume observer. The patient volume observer is operative to estimate a patient volume, that is, the volume actually delivered to the patient by accounting for volume deviation or loss caused by patient circuit leakage and valve dynamics. Based on the difference between the estimated patient volume and a set tidal volume, the pressure-regulated volume controller is operative to generate and update a circuit compliance pressure compensation factor. The pressure regulated feedback servo control loop is operative to modulate the peak airway pressure based on the circuit compliance pressure compensation factor, so as to achieve the set tidal volume while maintaining a constant inspiratory time and a constant I:E ratio.
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Citations
11 Claims
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1. A ventilation system, comprising:
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a ventilator operatively having an inspiratory port for supplying an inspiratory gas to a patient and an expiratory port for receiving an expiratory gas from a patient; a patient circuit having an inspiratory limb having one end connected to the inspiratory port, an expiratory limb having one end connected to the expiratory port, and a patient piece having one end connected to the other ends of the inspiratory and expiratory limbs and the other end connected to the patient; and a circuit compliance compensated pressure regulated volume control system, comprising a pressure-regulated volume controller operative to generate a circuit compliance pressure compensation factor based on a volume error defined as a volume differential between a set tidal volume and a volume actually delivered to the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification