초록 ▼

A method and device for monitoring the condition of at least one filter arranged in a flow path of a ventilator. Flow measurement signals are obtained from a first flow meter and a second flow meter and pressure signals are obtained from a first pressure meter and a second pressure meter. When a fil

A method and device for monitoring the condition of at least one filter arranged in a flow path of a ventilator. Flow measurement signals are obtained from a first flow meter and a second flow meter and pressure signals are obtained from a first pressure meter and a second pressure meter. When a filter in the inspiratory section of the ventilator is to be tested, flow through the filter and the drop in pressure across the filter are determined from the pressure measured by the first pressure meter and the second pressure meter. If the drop in pressure in relation to the flow lies within predefined limits, the filter is deemed to be serviceable. In a corresponding manner, another filter in the expiratory line can be tested, wherein flow through the filter is determined by the second flow meter.

대표청구항 ▼

[ I claim as my invention:] [4.] In a ventilator having an inspiratory line, first pressure meter means for determining a pressure in said inspiratory line, an expiratory line, second pressure meter means for determining a pressure in said expiratory line, flow meter means for measuring flow in at l

[ I claim as my invention:] [4.] In a ventilator having an inspiratory line, first pressure meter means for determining a pressure in said inspiratory line, an expiratory line, second pressure meter means for determining a pressure in said expiratory line, flow meter means for measuring flow in at least one of said inspiratory line and said expiratory line, and filter means for filtering gas in at least one of said inspiratory line and said expiratory line, the improvement comprising:means for receiving a signal from said first pressure meter means and said second pressure meter means identifying a pressure drop across said filter means, and for receiving a signal identifying flow through said filter means from said flow meter means;means for identifying a relationship between said pressure drop and said flow through said filter; andmeans for identifying a serviceability status of said filter means for deeming said filter means to be serviceable as long as said pressure drop is within predetermined limits relative to said flow.