Method and system for the controlled admixing of a gas or a gas mixture to a gas (mixture) flow

• US 20050039740A1
• Filed: 05/13/2004
• Published: 02/24/2005
• Est. Priority Date: 05/13/2003
• Status: Abandoned Application

• Current Assignee: INO Therapeutics GmbH
• Original Assignee: INO Therapeutics GmbH
• Inventors: Krebs, Christian, Fritz, Markus, Muellner, Rainer, Romako, Christian
• Application Number:
  US10/844,574
• Publication Number:
  US 20050039740A1
• Time in Patent Office: Days
• US Class Current: 128/200.240
• CPC Class Codes: A61M 16/12 by mixing different gases
• CPC Class Codes: A61M 16/18 Vaporising devices for anaesthetic preparations
• CPC Class Codes: A61M 16/202 electrically actuated
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2202/0275 Nitric oxide [NO]
• CPC Class Codes: A61M 2202/0291 Xenon

Abstract

A method and system for the controlled admixing of at least one gas or gas mixture to a gas (mixture) flow, so that, after the admixing to the gas (mixture) flow, the gas or gas mixture has a preadjusted and/or preadjustable concentration in this gas (mixture) flow by use of a pressure controller.

Claims

1. A method for the controlled admixing of at least one gas or a gas mixture to a gas flow, so that, after the admixing to the gas flow, the gas or gas mixture has a preadjusted and/or preadjustable concentration in said gas flow, said method comprising the steps:

a) determining at least one of a volume flow rate and pressure of the gas flow,

b) determining an actual value of at least one of a volume flow rate and pressure of the at least one gas or gas mixture to be admixed;

c) calculating, as a function of the determined at least one volume flow rate and pressure of the gas flow, a desired value of at least one of the volume flow rate and the pressure of the at least one gas or gas mixture to be admixed;

d) comparing the desired value with the determined actual value; and

e) modify the actual value to the desired value as a function of the difference between the desired value and the actual value, by influencing a pressure of the at least one gas or gas mixture to be admixed with a pressure controller.

4. The method according to claim 1, wherein the pressure controller is driven by one of a servo motor or a step motor.

5. The method according to claim 1, including the step of driving the pressure controller by a servo motor or a step motor, and by means of the position of the servo motor or step motor, the preadjusted pressure of the pressure controller being known, thereby eliminating a requirement for an additional detection of the actual flow rate value and/or the actual pressure value of the gas or gas mixture to be admixed.

6. The method according to claim 1, including the step of temporarily interrupting the admixing of the gas or gas mixture to the gas flow.

7. The method according to claim 1, wherein the gas or gas mixture being admixed to a gas flow is supplied to a person, wherein at least during the person'"'"'s expiratory phase, the admixing of the gas or gas mixture is interrupted.

8. The method according to claim 1, wherein the gas flow or gas mixture flow to be admixed is divided into several partial flows whose flow rates are controlled.

9. The method according to claim 1, wherein the gas or gas mixture to be admixed is at least one of air, perfluorocarbon, O₂, Xe, an Xe mixture, NO, an NO mixture, CO, a CO mixture, a CO₂ mixture for respiratory stimulation, an H₂ mixture, N₂O, an N₂O mixture, an 8F₆ mixture, nitroso ethanol or an anaesthetic gas.

10. The method according to claim 1, wherein the gas flow is at least one of air, O₂, N₂, Ar, Xe, He, SF_6? and/or an anaesthetic gas, a mixture of these gases or another therapeutically effective or therapeutically ineffective gas or gas mixture.

2. A method for the controlled admixing of a preadjusted or preadjustable quantity of a gas or gas mixture to a gas flow, said method comprising the steps:

a′

) comparing an actual value of the gas or gas mixture to be admixed with a desired value, and

b′

) modifying the actual value to the desired value as a function of the difference between the desired value and the actual value, wherein the step of modifying includes the step of influencing the pressure of the gas or gas mixture to be admixed with a pressure controller.

3. The method according to claim 2, further including the step of determining one of a volume flow rate and pressure of the gas flow.

17. The method according to claim 2, wherein the pressure controller is driven by one of a servo motor or a step motor.

18. The method according to claim 2, including the step of driving the pressure controller by a servo motor or a step motor, and by means of the position of the servo motor or step motor, the preadjusted pressure of the pressure controller being known, thereby eliminating a requirement for an additional detection of the actual flow rate value and/or the actual pressure value of the gas or gas mixture to be admixed.

11. A system for the controlled admixing of at least one gas or a gas mixture to a gas flow, whereby, after the admixing to the gas flow, the gas or gas mixture has at least one of a preadjusted and preadjustable concentration in said gas flow, said system comprising:

a) a first measuring unit for detecting at least one of a volume flow rate and pressure of the gas flow,

b) a second measuring unit for detecting an actual value of at least one of a volume flow rate and pressure of the gas or gas mixture to be admixed,

c) an analyzing unit in which, as a function of the least one of a determined volume flow rate and pressure of the gas flow, the desired value of the at least one volume flow rate and the pressure of the gas or gas mixture to be admixed is calculated and is compared with the measured actual value, and

d) a pressure controller associated with the gas or gas mixture flow to be admixed and which is controlled by the analyzing unit, so that the actual value is adapted to the desired value as a function of the difference between the desired value and the actual value.

14. The system according to claim 11, further including at least one valve connected to the pressure controller.

15. The system according to claim 11, further including at least one nozzle connected to the pressure controller.

16. The system according to claim 11, wherein the pressure controller is driven by one of a servo motor and a step motor.

12. A system for the controlled admixing of a preadjusted quantity of a gas or gas mixture to a gas flow, said system comprising

a′

) a measuring unit for detecting an actual value of the volume flow rate of the gas or gas mixture to be admixed,

b′

) an analyzing unit for comparing said detected actual value with a desired value, and

d) a pressure controller associated with the gas or gas mixture flow to be admixed and controlled by the analyzing unit so that the actual value is adapted to the desired value as a function of the difference between the desired value and the actual value.

13. The system according to claim 12, further including an additional measuring unit for the detecting at least one of a volume flow rate and pressure of the gas flow.

19. A control system for controlling of a gas to a gas flow, comprising:

a measuring device for measuring a volume flow rate of the gas to be admixed;

a comparing device for comparing said measured volume flow rate with a desired volume rate of the gas; and

a pressure controller for controlling the volume flow rate of the gas to the admixed as a function of an output of said comparing device.

20. The control system according to claim 19, further including an additional measuring device for measuring the volume flow rate of the gas flow;

and

a calculating device for calculating the desired rate as a function of the measured volume flow rate of the gas flow.