Carbon dioxide detector having borosilicate substrate

• US 20080081003A1
• Filed: 09/25/2006
• Published: 04/03/2008
• Est. Priority Date: 09/25/2006
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Ostrowski, Rafael, Debreczeny, Martin
• Granted Patent: US 8,449,834 B2
• Time in Patent Office: Days
• US Class Current: 422/86
• CPC Class Codes: G01N 31/223 for investigating presence of specific gases or aerosols G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10

Abstract

The present disclosure relates to a carbon dioxide detector having a borosilicate substrate. It may also have a carbon dioxide responsive indicator solution disposed on the borosilicate substrate. The carbon dioxide detector may be part of a carbon dioxide detector system also including an air intake operably connected to the housing to allow air to reach the carbon dioxide detector. The carbon dioxide detector may include a borosilicate substrate and a carbon dioxide responsive indicator solution disposed on the borosilicate substrate. This detector may be part of a further system, such as a resuscitation system. The detector may be made by wetting a borosilicate substrate with a carbon dioxide responsive indicator solution and drying the indicator solution to immobilize it and form a dried carbon dioxide detector. It may be used to detect the concentration of carbon dioxide in an air sample by exposing the detector to the sample.

Claims

1. A carbon dioxide detector comprising:

a borosilicate substrate; and

a carbon dioxide responsive indicator solution disposed on the borosilicate substrate, wherein the indicator solution changes color in less than 1 second in the presence of carbon dioxide above a first level.

2. The carbon dioxide detector according to claim 1, wherein the borosilicate substrate comprises a fibrous borosilicate.

3. The carbon dioxide detector according to claim 4, wherein the fibrous borosilicate comprises a thin, highly porous mesh.

4. The carbon dioxide detector according to claim 1, wherein the borosilicate substrate comprises an acrylic binder.

7. The carbon dioxide detector according to claim 1, wherein the carbon dioxide responsive indicator solution comprises an indicator.

12. The carbon dioxide detector according to claim 1, wherein the indicator comprises a base.

15. The carbon dioxide detector according to claim 1, wherein the indicator comprises a hygroscopic, high-boiling, transparent, colorless, water-miscible liquid.

16. The carbon dioxide detector according to claim 17, wherein the water-miscible liquid comprises at least one of glycerol, propylene glycol, monoethylene glycol, diethylene glycol, polyethylene glycol, or aliphatic alcohols, or any combinations thereof.

17. The carbon dioxide detector according to claim 1, wherein the indicator solution changes from purple to yellow if the presence of carbon dioxide is above a predetermined level.

18. The carbon dioxide detector according to claim 1, wherein the indicator solution changes from purple to tan if the presence of carbon dioxide is above a predetermined level.

6. The carbon dioxide detector according to claim 6, wherein the borosilicate substrate contains less than approximately 5% acrylic binder by volume.

5. The carbon dioxide detector according to claim 6, wherein the borosilicate substrate contains less than approximately 5% acrylic binder by weight.

9. The carbon dioxide detector according to claim 9, wherein the indicator comprises cresol red.

8. The carbon dioxide detector according to claim 9, wherein the indicator comprises a chromogenic dye.

10. The carbon dioxide detector according to claim 9, wherein the indicator comprises metacresol purple.

11. The carbon dioxide detector according to claim 9, wherein the indicator comprises at least one of thymol blue, phenol red, xylenol blue, a 3:

1 mixture of cresol red and thymol blue, bromothymol blue, neutral red, phenolphthalein, rosolic acid, α

-naphthelphthalein, or orange I, or any combinations thereof.

13. The carbon dioxide detector according to claim 14, wherein the base comprises calcium hydroxide.

13-1. The carbon dioxide detector according to claim 14, wherein the base comprises at least one of sodium carbonate, lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide, potassium carbonate, sodium barbitol, tribasic sodium phosphate, dibasic sodium phosphate, potassium acetate, monoethanolamine, diethanolamine, or piperidine, or any combinations thereof.

19. A carbon dioxide detector comprising:

a borosilicate substrate; and

a carbon dioxide responsive indicator solution disposed on the borosilicate substrate, wherein the indicator solution is adapted to change from color in the presence of carbon dioxide after a shelf life of greater than five years.

20. The carbon dioxide detector according to claim 19, wherein the borosilicate substrate comprises a fibrous borosilicate.

21. The carbon dioxide detector according to claim 20, wherein the fibrous borosilicate comprises a thin, highly porous mesh.

22. The carbon dioxide detector according to claim 19, wherein the borosilicate substrate comprises an acrylic binder.

23. The carbon dioxide detector according to claim 22, wherein the borosilicate substrate contains less than approximately 5% acrylic binder by weight.

24. The carbon dioxide detector according to claim 22, wherein the borosilicate substrate contains less than approximately 5% acrylic binder by volume.

25. The carbon dioxide detector according to claim 19, wherein the carbon dioxide responsive indicator solution comprises an indicator.

26. The carbon dioxide detector according to claim 25, wherein the indicator comprises a chromogenic dye.

27. The carbon dioxide detector according to claim 25, wherein the indicator comprises cresol red.

28. The carbon dioxide detector according to claim 25, wherein the indicator comprises metacresol purple.

29. The carbon dioxide detector according to claim 25, wherein the indicator comprises at least one of thymol blue, phenol red, xylenol blue, a 3:

1 mixture of cresol red and thymol blue, bromothymol blue, neutral red, phenolphthalein, rosolic acid, α

-naphthelphthalein, or orange I, or any combinations thereof.

30. The carbon dioxide detector according to claim 19, wherein the indicator comprises a base.

31. The carbon dioxide detector according to claim 30, wherein the base comprises calcium hydroxide.

32. The carbon dioxide detector according to claim 30, wherein the base comprises at least one of sodium carbonate, lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide, potassium carbonate, sodium barbitol, tribasic sodium phosphate, dibasic sodium phosphate, potassium acetate, monoethanolamine, diethanolamine, or piperidine, or any combinations thereof.

33. The carbon dioxide detector according to claim 19, wherein the indicator comprises a hygroscopic, high-boiling, transparent, colorless, water-miscible liquid.

34. The carbon dioxide detector according to claim 33, wherein the water-miscible liquid comprises at least one of glycerol, propylene glycol, monoethylene glycol, diethylene glycol, polyethylene glycol, or aliphatic alcohols, or any combinations thereof.

35. The carbon dioxide detector according to claim 19, wherein the indicator solution changes color virtually instantaneously as perceived by a human eye.

36. The carbon dioxide detector according to claim 19, wherein the indicator solution changes from yellow to purple if the presence of carbon dioxide is below a second level.

37. A carbon dioxide detector system comprising:

a carbon dioxide detector comprising;

a borosilicate substrate; and

a carbon dioxide responsive indicator solution disposed on the borosilicate substrate, wherein the indicator solution is adapted to change from color in the presence of carbon dioxide after a shelf life of greater than five years; and

a housing containing the carbon dioxide detector, the housing having an air intake to allow air to reach the carbon dioxide detector.

38. The carbon dioxide detector system according to claim 37, wherein the borosilicate substrate comprises a fibrous borosilicate.

39. The carbon dioxide detector system according to claim 37, wherein the fibrous borosilicate comprises a thin, highly porous mesh.

40. The carbon dioxide detector system according to claim 37, wherein the borosilicate substrate comprises an acrylic binder.