IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0410310
(2009-03-24)
|
등록번호 |
US-8353291
(2013-01-15)
|
우선권정보 |
EP-08006240 (2008-03-31) |
발명자
/ 주소 |
- Nicolazzi, Pascal
- Gentner, Julien
- Mougel, Laurent
- Grillier-Lanoir, Veronique
- Nadjafizadeh, Hossein
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
15 |
초록
▼
A breathing assistance system configured to determine pressure drop may include a gas delivery system configured to deliver gas toward a patient, one or more sensors configured to measure one or more parameters of gas delivered by the gas delivery system, a calibration module, and a pressure drop ca
A breathing assistance system configured to determine pressure drop may include a gas delivery system configured to deliver gas toward a patient, one or more sensors configured to measure one or more parameters of gas delivered by the gas delivery system, a calibration module, and a pressure drop calculation module. The calibration module may be configured to perform one or more pressure drop calibration tests, each pressure drop calibration test measuring a pressure drop in gas flowing through a breathing assistance system apparatus at a particular flow rate; and based at least on the results of the one or more pressure drop calibration tests, generating a non-linear equation relating (a) pressure drop in gas flowing through the breathing assistance system apparatus with (b) flow rate of gas flowing through the breathing assistance system apparatus. The pressure drop calculation module may be configured to determine pressure drops in gas flowing through the breathing assistance system apparatus for various flow rates based at least on the non-linear equation.
대표청구항
▼
1. A breathing assistance system configured to determine pressure drop, comprising: a gas delivery system configured to deliver gas toward a patient;one or more sensors configured to measure one or more parameters of gas delivered by the gas delivery system;a calibration module configured to: perfor
1. A breathing assistance system configured to determine pressure drop, comprising: a gas delivery system configured to deliver gas toward a patient;one or more sensors configured to measure one or more parameters of gas delivered by the gas delivery system;a calibration module configured to: perform one or more positive-pressure pressure drop calibration tests, each positive-pressure pressure drop calibration test measuring a pressure drop in gas flowing through a breathing assistance system apparatus at a particular positive flow rate; andperform one or more negative-pressure pressure drop calibration tests, each negative-pressure pressure drop calibration test measuring a pressure drop in gas flowing through a breathing assistance system apparatus at a particular negative flow rate; andbased at least on the results of the one or more pressure drop calibration tests, generate:(a) a positive-pressure non-linear equation relating (a) pressure drop in gas flowing through the breathing assistance system apparatus with (b) flow rate of gas flowing through the breathing assistance system apparatus, for positive-pressure gas flow; and(b) a negative-pressure non-linear equation relating (a) pressure drop in gas flowing through the breathing assistance system apparatus with (b) flow rate of gas flowing through the breathing assistance system apparatus, for negative-pressure gas flow;wherein the negative-pressure non-linear equation is different than the positive-pressure non-linear equation; anda pressure drop calculation module configured to determine pressure drops in gas flowing through the breathing assistance system apparatus for various flow rates based at least on the non-linear equation. 2. A breathing assistance system according to claim 1, wherein: generating a positive-pressure non-linear equation relating pressure drop with flow rate for positive-pressure gas flow comprises calculating one or more first coefficients for a non-linear equation relating pressure drop with flow rate; andgenerating a negative-pressure non-linear equation relating pressure drop with flow rate for positive-pressure gas flow comprises calculating one or more second coefficients for a non-linear equation relating pressure drop with flow rate. 3. A breathing assistance system according to claim 2, wherein the one or more first coefficients for the positive-pressure non-linear equation are different than the one or more second coefficients for the negative-pressure non-linear equation. 4. A breathing assistance system according to claim 2, wherein the one or more first coefficients for the positive-pressure non-linear equation are the same as the one or more second coefficients for the negative-pressure non-linear equation. 5. A breathing assistance system according to claim 1, further comprising: the calibration module being configured to calculate, based on the generated non-linear equation, coefficients for multiple linear equations defining multiple linear line segments corresponding to portions of a curve defined by the non-linear equation; andmemory configured to store the calculated coefficients; andthe pressure drop calculation module being configured to access the coefficients from the memory for determining pressure drops in gas flowing through the breathing assistance system apparatus for various flow rates. 6. A breathing assistance system according to claim 1, wherein the non-linear equation comprises a second degree polynomial equation. 7. A breathing assistance system according to claim 1, wherein: the non-linear equation comprises a second degree polynomial equation in the form of: Pressure Drop=A*(Flow Rate)^2+B*(Flow Rate); andgenerating the non-linear equation based at least on the results of the one or more pressure drop calibration tests comprises determining the coefficients A and B for the second degree polynomial equation. 8. A breathing assistance system according to claim 1, wherein the pressure drop calculation module is configured to use the non-linear equation directly to calculate pressure drops in gas flowing through the breathing assistance system apparatus at various flow rates. 9. A breathing assistance system configured to determine pressure drop, comprising: a gas delivery system configured to deliver gas toward a patient;one or more sensors configured to measure one or more parameters of gas delivered by the gas delivery system; anda pressure drop compensation system configured to: perform multiple pressure drop calibration tests, each pressure drop calibration test measuring a pressure drop in gas flowing through a breathing assistance system apparatus at a particular flow rate;calculate first coefficients for first multiple linear line segments based on the results of first multiple pressure drop calibration tests for a first configuration of the breathing assistance system, the first multiple linear line segments collectively approximating, for the first configuration of the breathing assistance system, a non-linear relationship between (a) pressure drop in gas flowing through the breathing assistance system apparatus and (b) flow rate of gas flowing through the breathing assistance system apparatus;calculate second coefficients for second multiple linear line segments based on the results of second multiple pressure drop calibration tests for a second configuration of the breathing assistance system, the second multiple linear line segments collectively approximating, for the second configuration of the breathing assistance system, a non-linear relationship between (a) pressure drop in gas flowing through the breathing assistance system apparatus and (b) flow rate of gas flowing through the breathing assistance system apparatus; andstore the first calculated coefficients and the second calculated coefficients such that, depending on the current configuration of the breathing assistance system, either the first calculated coefficients or the second calculated coefficients may be accessed while providing breathing assistance to the patient to determine pressure drops in gas flowing through the breathing assistance system apparatus for various flow rates. 10. A breathing assistance system configured to determine pressure drop, comprising: a gas delivery system configured to deliver gas toward a patient;one or more sensors configured to measure one or more parameters of gas delivered by the gas delivery system;memory configured to store: (a) a first look-up table of coefficients for linear equations representing multiple line segments corresponding to a first configuration of the breathing assistance system, the line segments collectively approximating a non-linear relationship between (a) pressure drop in gas flowing through the breathing assistance system apparatus and (b) flow rate of gas flowing through the breathing assistance system apparatus for the first configuration of the breathing assistance system; and(b) a second look-up table of coefficients for linear equations representing multiple line segments corresponding to a second configuration of the breathing assistance system, the line segments collectively approximating a non-linear relationship between (a) pressure drop in gas flowing through the breathing assistance system apparatus and (b) flow rate of gas flowing through the breathing assistance system apparatus for the second configuration of the breathing assistance system; anda pressure drop compensation system configured to: receive a measured flow rate value for gas flowing through the breathing assistance system apparatus;determine whether the breathing assistance system is configured in the first or second configuration;access from the first or second stored look-up table one or more coefficients corresponding to a particular one of the multiple line segments that corresponds with the measured flow rate value and the determined configuration of the breathing assistance system; anduse the one or more accessed coefficients corresponding to the particular line segment to calculate a pressure drop corresponding with the measured flow rate value. 11. A breathing assistance system configured to determine pressure drop, comprising: a gas delivery system configured to deliver gas toward a patient;one or more sensors configured to measure one or more parameters of gas delivered by the gas delivery system;a calibration module configured to: perform one or more positive-pressure pressure drop calibration tests, each positive-pressure pressure drop calibration test measuring a pressure drop in gas flowing through a breathing assistance system apparatus at a particular positive flow rate;perform one or more negative-pressure pressure drop calibration tests, each negative-pressure pressure drop calibration test measuring a pressure drop in gas flowing through a breathing assistance system apparatus at a particular negative flow rate; andcalculate one or more first non-linear equation coefficients corresponding to positive-pressure gas flow based on the results of the one or more positive-pressure pressure drop calibration tests;calculate one or more second non-linear equation coefficients corresponding to negative-pressure gas flow based on the results of the one or more negative-pressure pressure drop calibration tests; andgenerate a non-linear equation relating (a) pressure drop in gas flowing through the breathing assistance system apparatus with (b) flow rate of gas flowing through the breathing assistance system apparatus, the non-linear equation utilizing the one or more first coefficients for a first resulting non-linear curve corresponding to positive-pressure gas flow and the one or more second coefficients for a second resulting non-linear curve corresponding to negative-pressure gas flow; anda pressure drop calculation module configured to determine pressure drops in gas flowing through the breathing assistance system apparatus for various flow rates based at least on the non-linear equation.
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