RESPIRATORY MONITORING SYSTEM AND RESPIRATORY MONITORING METHOD

摘要

A respiratory monitoring system includes: a first sensing tube provided in a respiratory flow tube and provided with at least a first directional hole opened in a respiratory flow direction; a second sensing tube provided with at least a second directional hole corresponding to the first directional hole; a first sensing element configured to detect a first dynamic pressure (PL) using a differential pressure between gas flows from the first and second sensing tubes; a second sensing element configured to detect a second dynamic pressure (PH) using a differential pressure between gas flows from the first and second sensing tubes; and a computation unit configured to compute patient's respiration information including a tidal inspiratory volume and a tidal expiratory volume using the first and second dynamic pressures.

主权项

1. A respiratory monitoring system comprising:
a first sensing tube provided in a respiratory flow tube serving as a flow passage of a breathing machine and provided with at least a first directional hole opened in a respiratory flow direction; a second sensing tube provided with at least a second directional hole corresponding to the first directional hole and provided in the vicinity of the first sensing tube; a first sensing element configured to detect a first dynamic pressure (FL) using a differential pressure between gas flows from the first and second sensing tubes; a second sensing element configured to detect a second dynamic pressure (PH) using a differential pressure between gas flows from the first and second sensing tubes, the second sensing element having sensitivity lower than that of the first sensing element and a sensing range wider than that of the first sensing element; and a computation unit configured to compute patient's respiration information including a tidal inspiratory volume and a tidal expiratory volume using the first and second dynamic pressures, wherein the computation unit computes the respiration information using a lower flow rate (FL) if the lower flow rate (FL) computed from the first dynamic pressure is smaller than a preset threshold value, and the computation unit computes the respiration information using a higher flow rate (FH) computed from the second dynamic pressure if the lower flow rate (FL) is greater than the threshold value.