Inhalation anaesthesia delivery system and a method for leak detection in the inhalation anaesthesia delivery system

• US 8,033,280 B2
• Filed: 02/20/2008
• Issued: 10/11/2011
• Est. Priority Date: 02/23/2007
• Status: Active Grant

• Current Assignee: SunMed Group Holdings LLC
• Original Assignee: General Electric Company
• Inventors: Heinonen, Erkki Paavo
• Primary Examiner(s): DOUGLAS, STEVEN O
• Application Number:
  US12/034,198
• Publication Number:
  US 20080202526A1
• Time in Patent Office: 1,329 Days
• Field of Search: 128/204.21, 128/204.22, 128/203.13, 128/203.12, 128/205.28, 128/205.27, 128/200.24, 128/205.12, 128/205.29
• US Class Current: 128/204.22
• CPC Class Codes: A61M 16/0051 with alarm devices
• 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 16/085 Gas sampling
• 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 2205/15 Detection of leaks
• 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

Abstract

Inhalation anaesthesia delivery system and a leak detecting method, whereby the system comprises a fresh gas feeding arrangement connected to a breathing circuit, a monitor device, The monitor device is configured to monitor gas concentrations in the breathing circuit by using a sampling line. The monitor device is configured to measure at least two gas components'"'"' concentrations and identify changes, which are simultaneous towards the known ambient air concentration values of the two gas components'"'"' concentrations measured.

Claims

1. An inhalation anaesthesia delivery system, comprising:

a fresh gas feeding arrangement connected to a breathing circuit and a monitor device, wherein the monitor device is configured to monitor gas concentrations in the breathing circuit by using a sampling line, and

wherein the monitor device is configured to measure at least two gas components'"'"' concentrations and identify changes, which are simultaneous towards the known ambient air concentration values of the two gas components'"'"' concentrations measured, which identifies leak in the sampling line.

2. The inhalation anaesthesia delivery system of claim 1, wherein the monitor device is configured to measure and identify the changes which are essentially equal in magnitude.

3. The inhalation anaesthesia delivery system of claim 1, wherein the monitor device is configured to identify changes in CO2 and O2 concentrations.

4. The inhalation anaesthesia delivery system of claim 3, wherein the monitor device is configured to identify changes in end tidal CO2 (EtCO2) and end tidal O2 (EtO2) values.

5. The inhalation anaesthesia delivery system of claim 3, wherein the monitor device is configured to identify changes in inspired O2 (FiO2) concentration values.

6. The inhalation anaesthesia delivery system of claim 3, wherein the monitor device is configured to identify the changes by using concentration curve forms.

7. The inhalation anaesthesia delivery system of claim 1, wherein the system further comprises a ventilator.

8. A method for detecting a leak while measuring patient breathing gas in an anaesthesia delivery system, the method comprising:

monitoring gas concentrations in a breathing circuit by using a sampling line,

measuring at least two gas components'"'"' concentrations; and

identifying changes, which are simultaneous towards the known ambient air concentration values of the two gas components'"'"' concentrations, to identify a leak in the sampling line.

9. The method of claim 8, wherein the changes which are essentially equal in magnitude.

10. The method of claim 8, wherein the at least two gas components are CO2 and O2.

11. The method of claim 10, wherein the identifying changes further comprises identifying changes in end tidal CO2 (EtCO2) and end tidal O2 (EtO2) values.

12. The method of claim 10, wherein the identifying changes further comprises identifying changes in inspired O2 (FiO2) concentration values.

13. The method of claim 10, wherein the identifying changes further comprises using concentration curve forms.