Method for judging the reverse connection of a flow sensor and a respiratory mechanics measuring module used therein
First Claim
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1. A method for judging the reverse connection of a flow sensor in a respiratory mechanics measurement, comprising the following steps of:
- a. connecting the flow sensor to a respiratory mechanics measuring module;
b. sampling consecutively airway pressures and flows of a respiratory gas flowing between a patient and an anaesthetic machine; and
c. judging that the flow sensor is reversedly connected and sending an alarm signal indicating the reverse connection of the flow sensor to a main controller when any one of the following two instances appears;
c1) when the airway pressure decreases to the lowest point, the flow has a negative value while the patient is inhaling; and
c2) around the time when the pressure intensity decreases the fastest, the flow has a positive value.
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Abstract
A respiratory mechanics measuring module includes a flow sensor, a differential-pressure sensor and a sampled-signal processing circuit which are connected in series. The module further includes a flow sensor reverse connection judging module and an alarm. The flow sensor reverse connection judging module judges the reverse connection of the flow sensor. The alarm gives an alarm signal indicating the flow sensor reverse connection to the main controller when the flow sensor reverse connection judging module judges that the flow sensor is reversedly connected.
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Citations
9 Claims
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1. A method for judging the reverse connection of a flow sensor in a respiratory mechanics measurement, comprising the following steps of:
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a. connecting the flow sensor to a respiratory mechanics measuring module; b. sampling consecutively airway pressures and flows of a respiratory gas flowing between a patient and an anaesthetic machine; and c. judging that the flow sensor is reversedly connected and sending an alarm signal indicating the reverse connection of the flow sensor to a main controller when any one of the following two instances appears; c1) when the airway pressure decreases to the lowest point, the flow has a negative value while the patient is inhaling; and c2) around the time when the pressure intensity decreases the fastest, the flow has a positive value. - View Dependent Claims (2, 3)
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- 4. A respiratory mechanics measuring module, comprising a flow sensor, a differential pressure sensor and a sampled signal processing circuit which are connected in series, the sampled signal processing circuit transferring calculation results to a main controller, and further comprising a flow sensor reverse connection judging module and an alarm, wherein the flow sensor reverse connection judging module judges whether the flow sensor is reversedly connected based on output signals of the differential pressure sensor, and the alarm sends a prompting signal indicating the flow sensor reverse connection to the main controller when the flow sensor reverse connection judging module judges that the flow sensor is reversedly connected.
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7. A method for judging the reverse connection of a flow sensor in respiratory mechanics measurement, comprising the following steps of:
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a. providing a respiratory mechanics measuring module and connecting thereto the flow sensor to be judged, the respiratory mechanics measuring module comprising a differential pressure sensor, a sampled signal processing circuit and an alarm; b. measuring four pressure intensity values x1, x2, x3 and x4 of a respiratory gas in an airway corresponding to four consecutive sampling points of time within an arbitrary time interval and a flow value S of that time interval using the differential pressure sensor and the flow sensor, respectively, and calculating three pressure difference variables in the sampled signal processing circuit using the equations d×
1=x1−
x2, d×
2=x2−
x3 and d×
3=x3−
x4; andc. sending an alarm signal indicating the reverse connection of the flow sensor with the alarm, if x1, x2 and x3 are all smaller than zero and meanwhile x1 and x3 are equal to or greater than x2, and the flow value S is smaller than a predetermined first threshold value f1;
or if d×
1, d×
2 and d×
3 are all greater than zero and meanwhile d×
1 and d×
3 are smaller than or equal to d×
2, and the flow value S is greater than a predetermined second threshold value f2. - View Dependent Claims (8, 9)
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Specification