Patent EP0046570A2 successfully refreshed from Google Patents.
EP0046570A2
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Respiration monitoring apparatus
Assignee: Toshiba Corp
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Filing: 1981-08-19
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Granted: —
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Expires: 2001-08-19
Abstract
Abstract A respiration monitoring apparatus which comprises meters (22, 26) for determining the flow rate of air flow and the airway pressure of the living body fitted with an artificial respirator (18); a monitor (44) for displaying the waveforms of output signals from the meters (22, 26). The apparatus further comprises a signal processing circuit (28) which detects the end of the respective expiratory periods from the marks indicated by the output signals from the meters (22, 26) which denote the flow rate of breathed airflow, stores the average value of the airway pressures determined at the end of the respective expiratory periods, and, where the measured airway pressure determined falls below the stored average value, issues a detection signal denoting this condition, thereby changing a display pattern on the monitor (44).
Inventors
- 👤 Ayao Itoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0003; A61M16/0006; A61M16/0051; A61M16/021; A61M2016/0015; A61M2016/0018; A61M2016/0021; A61M2016/003; A61M2016/0033; A61M2016/0036
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
97 words
A respiration monitoring apparatus including means (22, 26, 50, 66) for determining the airway pressure and the flow rate of breathed air of a living body fitted with an artificial respirator, and characterized by further comprising signal processing means (28, 52, 54, 60, 64, 68, 70, 74, 76) for detecting the end of the expiratory period from the measured flow rate, storing the measured flow rate of breathed air at the end of the expiratory period, and, where the measured airway pressure is lower than the stored airway pressure, sending forth a detection signal denoting this condition.
Claim 2
Dependent Claim
97 words
A respiration monitoring apparatus including means (22, 26, 50, 66) for determining the airway pressure and the flow rate of breathed air of a living body fitted with an artificial respirator, and characterized by further comprising signal processing means (28, 52, 54, 60, 64, 68, 70, 74, 76) for detecting the end of the expiratory period from the measured flow rate, storing the measured flow rate of breathed air at the end of the expiratory period, and, where the measured airway pressure is lower than the stored airway pressure, sending forth a detection signal denoting this condition.
Claim 3
Dependent Claim
48 words
The respiration monitoring apparatus according to claim 1, wherein said signal processing means issues the detection signal when the level of the airway pressure measured in a prescribed length of time after the commencement of the expiratory period falls below the level of the previously stored airway pressure.
Claim 4
Dependent Claim
77 words
The respiration monitoring apparatus according to claim 1, wherein said signal processing means comprises: a memory (36) for storing output data from said measurement means (22, 26); and a processor (32) which is connected to the memory (34, 36), detects an expiratory period and inspiratory period by a mark denoting the flow rate of breathed air, compares measured airway pressure and the airway pressure determined at the end of the expiratory period, and issues the detection signal.
Claim 5
Dependent Claim
34 words
The respiration monitoring apparatus according to claim 3, wherein said processor averages the airway pressures measured at the end of the respective expiratory periods, and compares the measured airway pressure and the averaged value.
Claim 6
Dependent Claim
50 words
The respiration monitoring apparatus according to claim 1, which further comprises means (38, 44) for displaying the airway pressure and the flow rate of breathed air and for varying the pattern of display in accordance with the contents of the detection signal from the signal processing means (32, 34, 36).
Claim 7
Dependent Claim
24 words
The respiration monitoring apparatus according to claim 5, wherein said display means indicates the airway pressure and the flow rate of breathed air simultaneously.
Claim 8
Dependent Claim
43 words
The respiration monitoring apparatus according to claim 5, wherein said display means indicates the airway pressure and data on the flow rate of breathed air in the form of a locus on a coordinate plane defined by the corresponding axes X and Y.
Claim 9
Dependent Claim
40 words
The respiration monitoring apparatus according to claim 5, wherein said display means indicates the parameters of the ventilation dynamics determined from the airway pressure and data on the flow rate of breathed air in the form of a trend graph.
Claim 10
Dependent Claim
144 words
The respiration monitoring apparatus according to claim 1, wherein said signal processing means comprises: a respiration detector (52, 54) for issuing first and second pulse signals corresponding to the expiratory and inspiratory periods by wave-shaping the signal denoting the flow rate of breathed air; a detector (60, 64, 68, 70) for detecting and storing a minimum level of the airway pressure determined during the periods corresponding to the first and second pulse signals issued from the respiration detector (52, 54); and a comparator (74) which compares a minimum level of the airway pressure determined in the expiratory period with a minimum level of the airway pressure measured in the inspiratory period, and, where the minimum level of the airway pressure determined during the inspiratory period, is lower than the minimum level of the airway pressure determined during the expiratory period, issues a detection signal.
Claim 11
Dependent Claim
24 words
The respiration monitoring apparatus according to claim 9, which further comprises display means (80) driven by the output detection signal from said comparator (74).
Claim 12
Dependent Claim
67 words
The respiration monitoring apparatus according to claim 10, wherein said signal processing means further includes a subtractor (76) for arithmetically defining a difference between minimum levels of the airway pressure determined during the expiratory period and during the inspiratory period; and said display means (82, 78) indicates the output signal from the subtractor (76) and the minimum level of the airway pressure determined during the expiratory period.
Claim 13
Independent Claim
95 words
A method of monitoring respiration which comprises the steps of: detecting the end of the expiratory period by a mark indicated by an output signal from a flow meter (22); storing an output signal from a manometer (26) of an airway pressure; comparing the level of an output signal from the manometer with the stored signal, and, where the output signal from the manometer has a lower level than the stored signal, sending forth a detection signal; and informing the commencement of a spontaneous respiration of a living body in response to the detection signal.
Claim 14
Independent Claim
95 words
A method of monitoring respiration which comprises the steps of: detecting the end of the expiratory period by a mark indicated by an output signal from a flow meter (22); storing an output signal from a manometer (26) of an airway pressure; comparing the level of an output signal from the manometer with the stored signal, and, where the output signal from the manometer has a lower level than the stored signal, sending forth a detection signal; and informing the commencement of a spontaneous respiration of a living body in response to the detection signal.
References Cited (Backward Citations)
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