SETTING MANDATORY MECHANICAL VENTILATION PARAMETERS BASED ON PATIENT PHYSIOLOGY

• US 20080202523A1
• Filed: 02/23/2007
• Published: 08/28/2008
• Est. Priority Date: 02/23/2007
• Status: Abandoned Application

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Acker, Jaron Matthew, Tham, Robert Quinyew, Mitton, Michael Paul, Choncholas, Gary James
• Application Number:
  US11/678,464
• Publication Number:
  US 20080202523A1
• Time in Patent Office: Days
• US Class Current: 128/204.21
• CPC Class Codes: A61M 16/0078 Breathing bags
• CPC Class Codes: A61M 16/01 specially adapted for anaesthetising A61M16/104, A61M16/18 take precedence
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/104 specially adapted for anaesthetics A61M16/18 takes precedence
• CPC Class Codes: A61M 16/22 Carbon dioxide-absorbing devices ; Other means for removing carbon dioxidecartridges with absorbing substances for respiratory apparatus A62B19/00
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0036 in the breathing tube and used in both inspiratory and expiratory phase
• CPC Class Codes: A61M 2016/1025 the O2 concentration
• CPC Class Codes: A61M 2016/103 the CO2 concentration
• CPC Class Codes: A61M 2016/1035 the anaesthetic agent concentration
• CPC Class Codes: A61M 2202/0208 Oxygen
• CPC Class Codes: A61M 2202/0225 Carbon oxides, e.g. Carbon dioxide
• CPC Class Codes: A61M 2202/0283 Nitrous oxide (N2O)
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 2230/005 Parameter used as control input for the apparatus
• CPC Class Codes: A61M 2230/06 Heartbeat rate only
• CPC Class Codes: A61M 2230/202 partial carbon oxide pressure, e.g. partial dioxide pressure (P-CO2)
• CPC Class Codes: A61M 2230/205 partial oxygen pressure (P-O2)
• CPC Class Codes: A61M 2230/30 : Blood pressure A61M2230/04 takes precedence
• CPC Class Codes: A61M 2230/42 : Rate
• CPC Class Codes: A61M 2230/43 : Composition of exhalation
• CPC Class Codes: A61M 2230/432 : partial CO2 pressure (P-CO2)
• CPC Class Codes: A61M 2230/435 : partial O2 pressure (P-O2)
• CPC Class Codes: A61M 2230/437 : the anaesthetic agent concentration
• CPC Class Codes: A61M 2230/50 : Temperature

Abstract

A method of setting inspiratory time in controlled mechanical ventilation varies a subject'"'"'s inspiratory times; determines at least one or more of end tidal gas concentrations or gas volumes exhaled by the subject per breath or both associated with the inspiratory times; establishes a stable condition of at least one or more of the gas concentrations or the gas volumes or both; and determines an optimal inspiratory time based on a deviation from the stable condition. Similarly, a device for use in controlled mechanical ventilation comprises means for varying a subject'"'"'s inspiratory times; means for determining at least one or more of end tidal gas concentrations or gas volumes exhaled by the subject per breath or both associated with the inspiratory times; means for establishing a stable condition of at least one or more of the gas concentrations or the gas volumes or both; and means for determining an optimal inspiratory time based on a deviation from the stable condition.

Claims

1. A method of setting inspiratory time in controlled mechanical ventilation, comprising:

varying a subject'"'"'s inspiratory times;

determining at least one or more of end tidal gas concentrations or gas volumes exhaled by said subject per breath or both associated with said inspiratory times;

establishing a stable condition of at least one or more of said gas concentrations or said gas volumes or both; and

determining an optimal inspiratory time based on a deviation from said stable condition.

2. The method of claim 1, wherein at least one of said gas concentrations or said gas volumes include one or more gases exhaled by said subject.

3. The method of claim 2, wherein at least one of said gases includes carbon dioxide.

4. The method of claim 2, wherein at least one of said gases includes oxygen.

5. The method of claim 2, wherein at least one of said gases includes nitrous oxide.

6. The method of claim 2, wherein at least one of said gases includes inhaled anesthetic agent.

7. The method of claim 1, further comprising:

decreasing said subject'"'"'s inspiratory times to determine said optimal inspiratory time.

8. The method of claim 7, wherein said optimal inspiratory time corresponds to a smallest inspiratory time associated with said deviation.

9. The method of claim 1, further comprising:

increasing said subject'"'"'s inspiratory times to determine said optimal inspiratory time.

10. The method of claim 9, wherein said optimal inspiratory time corresponds to a smallest inspiratory time associated with said deviation.

11. The method of claim 1, further comprising:

displaying at least one or more of the following on a monitor;

said inspiratory times;

said gas concentrations;

or

said gas volumes.

12. The method of claim 1, wherein said inspiratory times vary by predetermined amounts.

13. The method of claim 12, wherein said predetermined amounts vary over time.

14. The method of claim 1, further comprising setting additional inspiratory times based on said optimal inspiratory time.

15. A device for use in controlled mechanical ventilation, comprising:

means for varying a subject'"'"'s inspiratory times;

means for determining at least one or more of end tidal gas concentrations or gas volumes exhaled by said subject per breath or both associated with said inspiratory times;

means for establishing a stable condition of at least one or more of said gas concentrations or said gas volumes or both; and

means for determining an optimal inspiratory time based on a deviation from said stable condition.