Air assistance apparatus for computing the airflow provided by only means of pressure sensors
First Claim
1. An apparatus to assist a patient'"'"'s respiration by delivering air to said patient through a mask, said mask being designed to be connected on a first extremity of a tube, said apparatus comprising:
- a control unit to adjust the pressure delivered by a blower of said apparatus,a first pressure sensor for measuring a first pressure, said first pressure sensor being connected to said control unit, anda second pressure sensor for measuring a second pressure at an air output of said blower, said second pressure sensor being connected to said control unit;
wherein when a tube is connected between said apparatus and a calibrating shell with a traversing hole having a known airflow resistance coefficient KS, the air flows from the apparatus to said calibrating shell, and the measured pressures are sent to said control unit, which calculates a tube airflow resistance coefficient KT based on said first and second measured pressures and said known airflow resistance coefficient KS,wherein when a tube is connected to said mask and connected to said apparatus on a second extremity of said tube, the air flows from the apparatus to the mask, and said control unit calculates the airflow at said second extremity of the tube based on said first and second pressures and said airflow resistance coefficient KT of said tube.
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0 Petitions
Accused Products
Abstract
An apparatus (1) to assist a patient'"'"'s respiration by delivering air to a patient through a mask, the mask designed to be connected to a first extremity of a tube, the apparatus including: a control unit (2) to adjust the pressure delivered by a blower (4), a first pressure sensor (6) for sensing pressure PM at the first tube extremity and being connected to the control unit, and a second pressure sensor(8) for sensing pressure PB at the air output of the blower and being connected to the control unit; so that, when a tube is connected to the mask and connected to the apparatus at its second extremity, the air flowing from the apparatus to the mask, the control unit is able to calculate the airflow at the tube'"'"'s second extremity from the pressures PM and PB and from the tube'"'"'s airflow resistance coefficient Kt.
50 Citations
41 Claims
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1. An apparatus to assist a patient'"'"'s respiration by delivering air to said patient through a mask, said mask being designed to be connected on a first extremity of a tube, said apparatus comprising:
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a control unit to adjust the pressure delivered by a blower of said apparatus, a first pressure sensor for measuring a first pressure, said first pressure sensor being connected to said control unit, and a second pressure sensor for measuring a second pressure at an air output of said blower, said second pressure sensor being connected to said control unit; wherein when a tube is connected between said apparatus and a calibrating shell with a traversing hole having a known airflow resistance coefficient KS, the air flows from the apparatus to said calibrating shell, and the measured pressures are sent to said control unit, which calculates a tube airflow resistance coefficient KT based on said first and second measured pressures and said known airflow resistance coefficient KS, wherein when a tube is connected to said mask and connected to said apparatus on a second extremity of said tube, the air flows from the apparatus to the mask, and said control unit calculates the airflow at said second extremity of the tube based on said first and second pressures and said airflow resistance coefficient KT of said tube. - View Dependent Claims (2, 3)
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4. An apparatus to assist a patient'"'"'s respiration by delivering air to said patient through a mask, said mask being designed to be connected on a first extremity of a tube, said apparatus comprising:
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a control unit to adjust the pressure delivered by a blower of said apparatus, a first pressure sensor for measuring a first pressure, said first pressure sensor being connected to said control unit, and a second pressure sensor for measuring a second pressure at the air output of said blower, said second pressure sensor being connected to said control unit; wherein when said tube is connected to said mask and connected to said apparatus on a second extremity of said tube, the air flows from the apparatus to the mask, and said control unit calculates the airflow at said second extremity of the tube based on said first and second pressures and an airflow resistance coefficient KT of said tube; and wherein the control unit comprises an offset compensation means for compensating the possible difference of gauging between the two pressure sensors. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A process for assisting a patient'"'"'s respiration by delivering air to the patient through a mask, comprising the steps of:
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providing an apparatus comprising a control unit for adjusting the pressure delivered by a blower of said apparatus, a first pressure sensor and a second pressure sensor, said second pressure sensor being provided at an air outlet of said blower, said first and second pressure sensors being connected to said control unit; providing a tube, a calibrating shell and said mask; calibrating said tube by connecting a first extremity of said tube to said calibrating shell with a traversing hole having a known airflow resistance coefficient KS and connecting a second extremity of said tube to the air outlet of said blower; switching said blower on, the air flowing from said apparatus to said calibrating shell; measuring a first pressure at said first pressure sensor and a second pressure at said second pressure sensor; sending the first and second measured pressures to said control unit, wherein said control unit calculates a tube airflow resistance coefficient KT based on said first and second measured pressures and said known airflow resistance coefficient KS; connecting said first extremity of said tube to said mask and applying said mask on the patient'"'"'s face; switching the blower on, the air flowing from said apparatus to said mask; and measuring a first pressure at said first pressure sensor and a second pressure at said second pressure sensor, wherein said control unit calculates the airflow at said second extremity of said tube based on the first and second pressures and the airflow resistance coefficient KT of said tube. - View Dependent Claims (23, 24)
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25. A process for assisting a patient'"'"'s respiration by delivering air to said patient through a mask, comprising the steps of:
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providing an apparatus comprising a control unit comprising an offset compensation means for adjusting the pressure delivered by a blower of said apparatus, and first and second pressure sensors connected to said control unit; providing a tube and said mask; connecting a first extremity of said tube to said mask, connecting a second extremity of said tube to said apparatus on a second extremity of said tube, and applying said mask to the patient'"'"'s face; switching said blower on, the air flowing from said apparatus to said mask, wherein said control unit calculates the airflow at said second extremity of the tube based on first and second pressures and an airflow resistance coefficient KT of said tube; and compensating a possible difference of gauging between said two pressure sensors using said offset compensation means. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification