Self-condensing pH sensor

• US 7,166,201 B2
• Filed: 12/01/2003
• Issued: 01/23/2007
• Est. Priority Date: 12/01/2003
• Status: Active Grant

• Current Assignee: Sierra Medical Technology
• Original Assignee: Sierra Medical Technology
• Inventors: Wolf, Erich
• Primary Examiner(s): Olsen; Kaj K.
• Application Number:
  US10/725,920
• Publication Number:
  US 20050115834A1
• Time in Patent Office: 1,149 Days
• Field of Search: 204/433, 204/435, 205/787.5
• US Class Current: 204/433
• CPC Class Codes: A61B 5/083 Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
• CPC Class Codes: A61B 5/14539 for measuring pH
• CPC Class Codes: G01N 27/302 pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes ion selective electrodes G01N27/333, glass electrodes G01N27/36
• CPC Class Codes: G01N 33/497 of gaseous biological material, e.g. breath

Abstract

The present invention pertains to an apparatus and a means of constructing a pH sensor that can detect changes in pH levels of humidified gases and liquid samples. When electronically connected to a computerized or analog display means, sensitive quantitative measurements can be obtained. Given the construction of current pH devices available today, there is a need in the field for a novel, miniaturized, self-condensing pH probe that can be used in fluid or humidified gases.

Claims

1. A self-condensing sensor assembly for monitoring pH:

An outer tubular member;

an inner tubular member, said outer tubular member co-linearly enclosing an inner tubular member;

an antimony sensor enclosed within said inner tubular member;

a reference element enclosed within said outer tubular member and located in a proximal position to said antimony sensor;

a wick material, said wick material having one side which partially surrounds and substantially engages a portion of said inner tubular member, said wick material extending from said antimony sensor to a proximal position whereby said wick material is substantially engaged to said reference element;

an ion conduction fluid entrained or retained within said wick material; and

said self-condensing sensor having the capability to establish an electrical connection via micro-droplets condensed across said antimony sensor and said reference element.

2. The sensor as recited in claim 1, wherein said wick material is selected from the group consisting of fibrous polymeric meshes of polyester, polyimide, polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS, nylon, acetal, or polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE) or any combinations thereof.

3. The sensor as recited in claim 1, wherein said ion conduction fluid contains a polysaccharide based material.

4. The sensor as recited in claim 1, wherein said ion conduction fluid comprises an electrolyte/water base gel.

5. The sensor as recited in claim 1, wherein said reference element comprises silver chloride.

6. The sensor as recited in claim 1, wherein said reference element comprises a silver element having a silver chloride coating.

7. The sensor as recited in claim 1, wherein said co-linear configuration between said outer tubular member and said inner tubular member are offset.

8. The sensor as recited in claim 1, further comprising an electrical and display means which is in communication with the sensor and processes information obtained from said sensor for presenting a pH reading.

9. A self-condensing sensor assembly for monitoring pH:

An outer tubular member;

an inner tubular member, said outer tubular member coaxially enclosing an inner tubular member;

an antimony sensor enclosed within said inner tubular member and substantially engaged to said inner surface of said inner tubular member, said antimony sensor including an electrical communication which extends to a proximal terminal position;

a reference element enclosed within said outer tubular member and located proximal to said antimony sensor, said reference sensor element includes an electrical communication which extends to the proximal terminal position;

a wick material, said wick material having one side which partially surrounds and substantially engages a portion of said inner tubular member, said wick material extending from said antimony sensor to a proximal position whereby said wick material is substantially engaged to said reference element;

an ion conduction fluid is entrained or retained within said wick material; and

said self-condensing sensor having the capability to establish an electrical connection via micro-droplets condensed across said antimony sensor and said reference element.

10. The sensor as recited in claim 9, wherein said wick material is selected from the group consisting of fibrous polymeric meshes of polyester, polyimide, polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS, nylon, acetal, or polyethylene terephthalate, (PET) polytetrafluoroethylene (PTFE) or any combinations thereof.

11. The sensor as recited in claim 9, wherein said ion conduction fluid contains a polysaccharide based material.

12. The sensor as recited in claim 9, wherein said ion conduction fluid comprises an electrolyte/water base gel.

13. The sensor as recited in claim 9, wherein said reference element comprises silver chloride.

14. The sensor as recited in claim 9, wherein said reference element comprises a silver element having a silver chloride coating.

15. The sensor as recited in claim 9, wherein said co-linear configuration between said outer tubular member and said inner tubular member are offset.

16. The sensor as recited in claim 9, further comprising an electrical connector on the proximal end of said sensor, said electrical connector is connected to said electrical communication with the antimony sensor and the reference element.

17. The sensor as recited in claim 9, further comprising a display means which is in electrical communication with the antimony electrical communication and the reference element electrical communication;

said display may further processes information obtained from said sensor for presenting pH data in digital or in an analog format.

18. The system as recited in claim 9, wherein said electrical communication is accomplished by a plurality of wires.

19. The system as recited in claim 9, wherein said electrical communication is accomplished by a wireless means.

20. A self-condensing sensor assembly for monitoring pH:

An outer tubular member;

an inner tubular member, said outer tubular member coaxially enclosing an inner tubular member;

an antimony sensor enclosed within said inner tubular member;

a reference element enclosed within said outer tubular member and located in a proximal position to said antimony sensor;

a wick material, said wick material having one side which partially surrounds and substantially engages a portion of said inner tubular member, said wick material extending from said antimony sensor to a proximal position whereby said wick material is substantially engaged to said reference element;

an ion conduction fluid entrained or retained within said wick material; and

said self-condensing sensor having the capability to establish an electrical connection via micro-droplets condensed across said antimony sensor and said reference element.

21. A self-condensing sensor assembly for monitoring pH:

An outer tubular member;

an inner tubular member, said outer tubular member co-linearly or coaxially enclosing an inner tubular member;

an antimony sensor enclosed within said inner tubular member;

a reference element enclosed within said outer tubular member and located in a proximal position to said antimony sensor;

a wick material, said wick material having one side which partially surrounds and substantially engages a portion of said inner tubular member, said wick material extending from said antimony sensor to a proximal position whereby said wick material is substantially engaged to said reference element;

an ion conduction fluid entrained or retained within said wick material,

said wick material and said antimony sensor are positioned at a terminal end of said outer tubular member;

said sensor assembly being of a mass capable of rapidly changing temperature such that it functions to cool below the dew point of exhaled breath and subsequently condenses humid patient breath in close proximity to said sensor to form a liquid on said terminal end; and

said self-condensing sensor having the capability to establish an electrical connection via micro-droplets condensed across said antimony sensor and said reference element.