Respiratory monitoring system
First Claim
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1. A respiratory monitoring system, comprising:
- a plurality of sensors that produces weight signals corresponding to forces applied by a person under respiratory monitoring during sleep;
a respiratory signal producing means that produces a respiratory signal representing respiratory conditions of the person based on the weight signals;
a sensor selection control means that outputs switching signals;
a sensor selecting means that selects sensors based on the switching signals;
a signal converting means that converts weight signals outputted from the sensors that are selected by the sensor selecting means to digital signals;
a signal strength determining means that determines a signal strength in a respiration frequency band corresponding to the respiratory body movement and a signal strength in another frequency band;
a signal strength comparing means that compares the signal strength in the respiration frequency band with the signal strength in the other frequency band;
a signal selecting means that selects weight signals having a signal strength in the respiratory frequency band with a predetermined ratio to the signal strength in the other frequency band; and
a target sensor selecting means that selects the sensors outputting the signal selected by the signal selecting means, wherein the respiratory signal producing means produces the respiratory signal based on the weight signals outputted from the sensors that are selected by the target sensor selecting means.
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Abstract
A microcomputer included in a respiratory monitoring system selects sensors that have output signals related to respiration of a person from sensors detecting forces applied by the person. To select the sensors, levels of the signals are compared between a respiratory frequency band and another frequency band. If the level of the signal in the respiratory frequency band is predetermined times higher than that of the signal in the other frequency band, the sensor is selected. The respiratory curve is produced based on weight signals outputted from the selected sensors.
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Citations
21 Claims
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1. A respiratory monitoring system, comprising:
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a plurality of sensors that produces weight signals corresponding to forces applied by a person under respiratory monitoring during sleep;
a respiratory signal producing means that produces a respiratory signal representing respiratory conditions of the person based on the weight signals;
a sensor selection control means that outputs switching signals;
a sensor selecting means that selects sensors based on the switching signals;
a signal converting means that converts weight signals outputted from the sensors that are selected by the sensor selecting means to digital signals;
a signal strength determining means that determines a signal strength in a respiration frequency band corresponding to the respiratory body movement and a signal strength in another frequency band;
a signal strength comparing means that compares the signal strength in the respiration frequency band with the signal strength in the other frequency band;
a signal selecting means that selects weight signals having a signal strength in the respiratory frequency band with a predetermined ratio to the signal strength in the other frequency band; and
a target sensor selecting means that selects the sensors outputting the signal selected by the signal selecting means, wherein the respiratory signal producing means produces the respiratory signal based on the weight signals outputted from the sensors that are selected by the target sensor selecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A respiratory monitoring system for a sleep apnea syndrome examination comprising:
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a respiratory signal producing means that produces a respiratory signal representing a variation in weight applied due to a respiratory body movement of a person under the sleep apnea syndrome examination; and
a determination means that detects apnea or hypopnea of the person based on a variation in frequency of the respiratory signal wherein;
the determination means monitors a variation in amplitude of the respiratory signal;
the determination means detects apnea or hypopnea when the amplitude of the respiratory signal decrease, increase, and then decrease with time and a frequency of the respiratory signal increases as the amplitude of the same increases. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A respiratory monitoring system for a sleep apnea syndrome examination comprising:
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a respiratory signal producing means that produces a respiratory signal representing a variation in weight applied due to a respiratory body movement of a person under the sleep apnea syndrome examination; and
in frequency of the respiratory signal, wherein the determination means detects apnea or hypopnea when the frequency of the respiratory signal varies from low to high when a period of the respiratory signal becomes 0.5 second shorter than the previous signal. - View Dependent Claims (21)
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Specification