Carbon dioxide-sensing airway products and technique for using the same

• US 8,454,526 B2
• Filed: 09/25/2006
• Issued: 06/04/2013
• Est. Priority Date: 09/25/2006
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Baker, Clark R. Jr., Mecca, Roger, O'Neil, Michael P., Ostrowski, Rafael
• Primary Examiner(s): Marmor, II, Charles A
• Assistant Examiner(s): TOTH, KAREN E
• Application Number:
  US11/526,846
• Publication Number:
  US 20080077036A1
• Time in Patent Office: 2,444 Days
• Field of Search: 600529-543, 128/207
• US Class Current: 600/532
• CPC Class Codes: A61B 5/0836 Measuring rate of CO2 production
• CPC Class Codes: A61B 5/087 Measuring breath flow
• CPC Class Codes: A61B 5/091 Measuring volume of inspired or expired gases, e.g. to determine lung capacity
• CPC Class Codes: A61B 5/412 Detecting or monitoring sepsis
• CPC Class Codes: A61M 16/0057 Pumps therefor
• CPC Class Codes: A61M 16/04 Tracheal tubes catheters in general A61M25/00
• CPC Class Codes: A61M 16/0415 with access means to the stomach
• CPC Class Codes: A61M 16/042 with separate conduits for in-and expiration gas, e.g. for limited dead volume
• CPC Class Codes: A61M 16/0434 Cuffs
• CPC Class Codes: A61M 16/0443 Special cuff-wall materials A61M16/0481, A61M16/0422 take precedence
• CPC Class Codes: A61M 16/0459 one cuff behind another
• CPC Class Codes: A61M 16/0475 having openings in the tube
• CPC Class Codes: A61M 16/0486 Multi-lumen tracheal tubes
• CPC Class Codes: A61M 16/08 Bellows; Connecting tubes having means for taking samples G01N1/22; Water traps; Patient circuits
• CPC Class Codes: A61M 2016/0413 with detectors of CO2 in exhaled gases
• CPC Class Codes: A61M 2016/103 the CO2 concentration
• CPC Class Codes: A61M 2230/40 Respiratory characteristics
• CPC Class Codes: A61M 2230/432 partial CO2 pressure (P-CO2)

Abstract

An airway device is provided that may track the flow of respiratory gases through the device with sensing elements at a plurality of locations along the gas flow path of the device. Such a device may be useful for assessing a variety of clinical states, for adjusting patient ventilator settings, or for determining whether or not an airway device has been properly inserted into a patient airway.

Claims

1. A medical device comprising:

a conduit adapted to transfer a gas to or from a patient; and

a plurality of sensing components associated with a respective plurality of locations on the conduit, wherein the plurality of sensing components is adapted to provide a signal related to a carbon dioxide gas in the conduit at the respective plurality of locations, wherein at least one of the plurality of sensing components comprises a borosilicate substrate having an acrylic binder incorporated within the borosilicate substrate, and a carbon dioxide-responsive indicator solution disposed on the borosilicate substrate wherein the acrylic binder increases a hydrophobicity of the borosilicate substrate relative to borosilicate alone.

2. The medical device of claim 1, wherein the conduit comprises an endotracheal tube.

3. The medical device of claim 1, comprising a ventilator to which the conduit is operatively connected.

4. The medical device of claim 1, comprising a selective barrier disposed on at least one sensing component that is substantially impermeable to water.

5. The medical device of claim 1, comprising a temperature sensor adapted to provide signal related to a gas temperature, a humidity sensor, or an ambient pressure sensor.

6. The medical device of claim 1, wherein at least one of the plurality of sensing components comprises a chemical indicator.

7. The medical device of claim 1, wherein at least one of the plurality of sensing components comprises an electrochemical transducer.

8. The medical device of claim 1, wherein at least one of the plurality of sensing components comprises a non-optical transducer.

9. The medical device of claim 1, wherein at least one of the plurality of sensing components comprises an optical transducer.

10. The medical device of claim 1, wherein at least one of the plurality of sensing components comprises a quantum-restricted element.

11. The medical device of claim 1, wherein the conduit comprises at least one lumen adapted to transfer gas to at least one of the plurality of sensing components.

12. The medical device of claim 1, wherein at least one of the plurality of sensing components is embedded in the conduit.

13. A system comprising:

a conduit adapted to transfer a gas to or from a patient;

a plurality of sensing components associated with a respective plurality of locations on the conduit, wherein the plurality of sensing components is adapted to provide a signal related to a carbon dioxide gas in the conduit at the respective plurality of locations, wherein at least one of the plurality of sensing components comprises a borosilicate substrate having an acrylic binder incorporated within the borosilicate substrate, and a carbon dioxide-responsive indicator solution is disposed on the borosilicate substrate and wherein the borosilicate substrate having the acrylic binder is more hydrophobic than borosilicate alone; and

a monitor adapted to be operatively coupled to the plurality of sensing components.

14. The system of claim 13, wherein the conduit comprises an endotracheal tube.

15. The system of claim 13, comprising a ventilator to which the conduit is operatively connected.

16. The system of claim 13, comprising a selective barrier disposed on at least one sensing component that is substantially impermeable to water.

17. The system of claim 13, comprising a temperature sensor adapted to provide signal related to a gas temperature, a humidity sensor, or an ambient pressure sensor.

18. The system of claim 13, wherein at least one of the plurality of sensing components comprises a chemical indicator.

19. The system of claim 13, wherein at least one of the plurality of sensing components comprises an electrochemical transducer.

20. The system of claim 13, wherein at least one of the plurality of sensing components comprises a non-optical transducer.

21. The system of claim 13, wherein at least one of the plurality of sensing components comprises an optical transducer.

22. The system of claim 13, wherein at least one of the plurality of sensing components comprises a quantum-restricted element.

23. The system of claim 13, wherein the conduit comprises at least one lumen adapted to transfer gas to at least one of the plurality of sensing components.

24. The system of claim 13, wherein at least one of the plurality of sensing components is embedded in the conduit.

25. A method of manufacturing a medical device, comprising:

providing a conduit adapted to transfer a gas to or from a patient; and

providing a plurality of sensing components associated with a respective plurality of locations on the conduit, wherein the plurality of sensing components is adapted to provide a signal related to a carbon dioxide gas in the conduit at the respective plurality of locations, and wherein at least one of the plurality of sensing components comprises a borosilicate substrate having an acrylic binder incorporated within the borosilicate substrate, and a carbon dioxide-responsive indicator solution is disposed on the borosilicate substrate and wherein the borosilicate substrate having the acrylic binder is more hydrophobic than borosilicate alone.

26. The method of claim 25, wherein the providing the conduit comprises providing an endotracheal tube.

27. The method of claim 25, comprising providing a selective barrier disposed on at least one sensing component that is substantially impermeable to water.

28. The method of claim 25, comprising providing a temperature sensor adapted to provide signal related to a gas temperature.

29. The method of claim 25, wherein providing the plurality of sensing components comprises providing at least one sensing component comprising a chemical indicator.

30. The method of claim 25, wherein providing the plurality of sensing components comprises providing at least one sensing component comprising an electrochemical transducer.

31. The method of claim 25, wherein providing the plurality of sensing components comprises providing at least one sensing component comprising a non-optical transducer.

32. The method of claim 25, wherein providing the plurality of sensing components comprises providing at least one sensing component comprising an optical transducer.

33. The method of claim 25, wherein providing the plurality of sensing components comprises providing at least one sensing component comprising a quantum-restricted element.

34. The method of claim 25, wherein providing the conduit comprises providing at least one lumen adapted to transfer gas to at least one of the plurality of sensing components.

35. The method of claim 25, wherein providing the plurality of sensing components comprises embedding at least one of the plurality of sensing components is in the conduit.

36. The method of claim 25, comprising providing a humidity sensor.

37. The method of claim 25, comprising providing an ambient pressure sensor.