Patient circuit disconnect system for a ventilator and method of detecting patient circuit disconnect
First Claim
1. A system for detecting disconnect of a patient circuit of a ventilation system, comprising:
- a) means for detecting a volume loss lasting for a first predetermined period of time;
b) means for detecting a pressure loss lasting for at least two consecutive breaths or for a breath longer than a second predetermined period of time;
c) means for detecting a pressure loss continuing for a third predetermined period of time;
d) means for detecting a volume loss for a single breath;
e) means for detecting a pressure loss for a single breath; and
f) means for detecting an increase of compliance,wherein the detecting for a)-c) result in generating an alarm, during an inhalation phase and wherein the detecting for d)-f) result in a signal, during an inhalation phase, for adjusting operations instead of the generating of the alarm.
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Accused Products
Abstract
A method of detecting disconnect of a patient circuit of a ventilation system, wherein a circuit disconnect is detected with a first sensitivity and a second sensitivity. The circuit disconnect detected with the first sensitivity is performed by detecting a volume loss for a minimum period of time, detecting a peak pressure loss for at least two consecutive breathing cycles or a minimum period of time, and detecting a pressure loss continuing for a predetermined period of time. The circuit disconnect detected with the second sensitivity is performed by detecting a volume loss for a single breathing cycle, detecting a pressure loss for a single breathing cycle, and detecting an increase of compliance. The first sensitivity is lower than the second sensitivity. Preferably, an alarm is activated when the circuit disconnect is detected with the first sensitivity, and subsystems of the ventilation system is informed of the circuit disconnect that has been detected with the second sensitivity.
63 Citations
44 Claims
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1. A system for detecting disconnect of a patient circuit of a ventilation system, comprising:
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a) means for detecting a volume loss lasting for a first predetermined period of time; b) means for detecting a pressure loss lasting for at least two consecutive breaths or for a breath longer than a second predetermined period of time; c) means for detecting a pressure loss continuing for a third predetermined period of time; d) means for detecting a volume loss for a single breath; e) means for detecting a pressure loss for a single breath; and f) means for detecting an increase of compliance, wherein the detecting for a)-c) result in generating an alarm, during an inhalation phase and wherein the detecting for d)-f) result in a signal, during an inhalation phase, for adjusting operations instead of the generating of the alarm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A ventilation system, comprising:
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an inspiratory flow sensor operative to measure an inspiratory flow of a patient circuit of the ventilation system; an expiratory flow sensor operative to measure an expiratory flow of the patient circuit; a pressure sensor operative to measure an expiratory pressure of the patient circuit; a first set of processing units comprising; a long-term volume loss detection unit, operative to detect volume loss lasting for at least a first predetermined period of time; a consecutive pressure loss detection unit, operative to detect pressure loss lasting for at least two consecutive breathing cycles or a second predetermined period of time; and a continuous pressure loss detection unit, operative to detect pressure loss continuing for at least a third predetermined period of time; and a second set of processing units comprising; a short-term volume loss detection unit, operative to detect volume loss for a single breathing cycle; a single-breath pressure loss detection unit, operative to detect pressure loss for a single breathing cycle; and a compliance increase detection unit, operative to detect compliance increase caused by circuit disconnect, wherein any one or more of the detecting operations associated with the first set of processing units result in generating an alarm, during an inhalation phase, wherein any one or more of the detecting operations associated with the second set of processing units result in a signal, during an inhalation phase, for adjusting operations of the ventilation system instead of the generating of the alarm. - View Dependent Claims (39, 40, 41)
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42. A device for detecting a disconnect occurring to a patient circuit of a ventilation system, comprising:
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a first processor for generating a primary output to a main alarm and detecting a circuit disconnect of the patient circuit through signal transmitted from a flow sensor and a pressure sensor; and a second processor for generating a secondary output to inform onboard subsystems of the ventilation system and detecting a circuit disconnect of the patient circuit through signal transmitted from the flow sensor and the pressure sensor, wherein the detection of the patient circuit disconnect of the first processor is less sensitive than that of the second processor, wherein each processor generates its respective output during an inspiratory phase of a patient breathing cycle, and wherein the first processor generates the alarm during the inspiratory phase and the second processor generates a signal, during the inspiratory phase, for adjusting learning operations instead of the alarm. - View Dependent Claims (43, 44)
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Specification