System and method for circuit compliance compensated volume assured pressure control in a patient respiratory ventilator
First Claim
1. A circuit compliance compensated volume assured pressure control system, comprising:
- a circuit compliance estimator, operative to estimate a patient circuit compliance;
a patient circuit volume estimator, operative to estimate a circuit volume VOLCKT—
EST based on the patient circuit compliance and a patient estimated pressure Py;
a patient volume observer, operative to estimate a patient volume VOLTID—
EST based on a measure delivered net volume VOLNET and the patient circuit compliance;
a volume assurance controller, operative to generate a circuit compliance volume compensation factor VOLTID—
CTL based on a preset assured volume VOLASS—
SET and the estimated patient volume VOLTID—
EST, anda decelerating inspiratory flow corrector, operative to generate a decelerating inspiratory flow command based on a preset inspiratory time TINSP, the volume compensation factor VOLTID—
CTL and a preset assured volume VOLASS—
SET.
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Accused Products
Abstract
A system for circuit compliance compensated volume assurance pressure control in a patient respiratory ventilation circuit, having a patient circuit volume estimator for estimating a patient circuit compliance, a patient circuit volume estimator to estimate a circuit volume VOLCKT
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Citations
56 Claims
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1. A circuit compliance compensated volume assured pressure control system, comprising:
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a circuit compliance estimator, operative to estimate a patient circuit compliance; a patient circuit volume estimator, operative to estimate a circuit volume VOLCKT — EST based on the patient circuit compliance and a patient estimated pressure Py;a patient volume observer, operative to estimate a patient volume VOLTID — EST based on a measure delivered net volume VOLNET and the patient circuit compliance;a volume assurance controller, operative to generate a circuit compliance volume compensation factor VOLTID — CTL based on a preset assured volume VOLASS— SET and the estimated patient volume VOLTID— EST, anda decelerating inspiratory flow corrector, operative to generate a decelerating inspiratory flow command based on a preset inspiratory time TINSP, the volume compensation factor VOLTID — CTL and a preset assured volume VOLASS— SET. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for circuit compliance compensated volume assured pressure control in a patient ventilation circuit, comprising:
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a volume assurance controller operative to provide an estimated circuit compliance volume compensation factor VOLTID — CTL based on a patient estimated pressure Py, an estimated or measured patient volume, VOLTID— EST or VOLTID— Y, and a preset assured volume VOLASS— SET; anda decelerating inspiratory flow corrector operative to modulate an inspiratory flow QINSP — SET based on a preset waveform, a preset inspiratory time TINSP— SET, a preset assured volume VOLASS— SET and the volume compensation factor VOLTID— CTL output from the volume assurance controller. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A patient respiratory ventilation circuit, comprising:
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a ventilator, operative to provide an inspiratory gas to and receive an expiratory gas from a patient via a patient circuit; a system for circuit compliance compensated volume assured pressure control, comprising; a volume assurance controller operative to provide an estimated circuit compliance volume compensation factor VOLTID — CTL based on an estimated or measured patient volume, VOLTID— EST or VOLTID— Y, and a preset assured volume VOLASS— SET, anda decelerating inspiratory flow corrector operative to modulate an inspiratory flow QINSP — SET based on a preset waveform, a preset inspiratory time TINSP— SET, a preset assured volume VOLASS— SET, and the volume compensation factor VOLTID— CTL output from the volume assurance controller; anda servo control subsystem operative to control a flow control valve and an exhalation valve of the ventilator according to the preset waveform, the preset inspiratory time TINSP — SET, and the larger amount between the inspiratory flow QINSP— SET modulated by the decelerating inspiratory flow corrector and an inspiratory pressure controller flow QINSP— PRSCTL. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method for circuit compliance compensated volume assurance pressure control in a patient respiratory ventilation system, comprising:
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a) measuring a patient volume VOLTID — Y through a flow sensor installed at a patient piece of a patient circuit in the ventilation system, or estimating a patient volume VOLTID— EST based on a machine delivered net volume VOLNET and a circuit compliance CT of the patient circuit; andb) predetermining an initial value INICKT — VOL for a circuit compliance volume compensation factor VOLTID— CTL and updating the volume compensation factor VOLTID— CTL based on a preset assured volume VOLASS— SET and the patient volume VOLTID— Y or VOLTID— EST for each breath; andc) generating an inspiratory flow QINSP — SET according to a predetermined waveform, a preset inspiratory time TINSP, a preset assured volume VOLASS— SET, and the volume compensation factor VOLTID— CTL. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification