US5175016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making gas sensing element
Assignee: Terumo Cardiovascular Systems Corp
•
Filing: 1990-03-20
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Granted: 1992-12-29
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Expires: 2010-03-20
Abstract
Abstract A method for making a sensing element, and an assembled sensing element, useful in sensing the concentration of a gas, e.g., carbon dioxide, in a medium, e. g. blood, are disclosed. In one embodiment, the method comprises placing a quantity of a sensing composition precursor between and in contact with a transparent, gas impermeable solid disc and an opaque, gas permeable film, the sensing composition precursor comprises a sensing component, a polymer precursor and a cross-linking agent; and forming a gas sensing composition from this quantity of sensing composition precursor.
Inventors
- 👤 Masao Yafuso
- 👤 Mark Z. Holody
- 👤 Thomas P. Maxwell
- 👤 Thomas G. Hacker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:49
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/783; G01N31/00; G01N31/22; G01N31/223; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/204998
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
91 words
A method for making a gas sensing element useful in sensing the concentration of a gas in a medium comprising: placing sensing composition precursor between and in contact with a transparent, gas impermeable solid disc and an opaque, gas permeable film oppositely disposed from said transparent, gas impermeable solid disc, said sensing composition precursor comprising a sensing component and a polymer precursor; and, thereafter, forming from said sensing composition precursor sensing composition including gas permeable and light permeable polymeric material and said sensing component, said forming including reacting said polymer precursor.
Claim 2
Independent Claim
91 words
A method for making a gas sensing element useful in sensing the concentration of a gas in a medium comprising: placing sensing composition precursor between and in contact with a transparent, gas impermeable solid disc and an opaque, gas permeable film oppositely disposed from said transparent, gas impermeable solid disc, said sensing composition precursor comprising a sensing component and a polymer precursor; and, thereafter, forming from said sensing composition precursor sensing composition including gas permeable and light permeable polymeric material and said sensing component, said forming including reacting said polymer precursor.
Claim 3
Dependent Claim
40 words
The method of claim 1 wherein said transparent, gas impermeable solid disc is made of glass, and said opaque, gas permeable film includes an opaque agent and a polymer selected from the group consisting of polyfluorohydrocarbons, polyfluorocarbons and mixtures thereof.
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein said polymer is polytetrafluoroethylene.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein said sensing composition precursor further includes a cross-linking agent and said gas permeable and light permeable polymeric material is cross-linked.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein said sensing component is dissolved in an aqueous liquid dispersed in said gas permeable and light permeable polymeric material.
Claim 7
Dependent Claim
53 words
The method of claim 5 wherein said gas permeable and light permeable polymeric material is substantially ion impermeable, said dispersed aqueous liquid of said sensing composition is buffered and said sensing component is effective to provide a signal which varies as the pH of said dispersed aqueous liquid of said sensing composition varies.
Claim 8
Dependent Claim
42 words
The method of claim 6 wherein said dispersed aqueous liquid of said sensing composition has a pH in the range of about 6 to about 8 and the gas sensing element is effective in sensing the concentration of carbon dioxide in blood.
Claim 9
Dependent Claim
36 words
The method of claim 5 wherein said sensing composition precursor further includes a hydrophilic dispersing agent in an amount effective to facilitate maintaining said dispersed aqueous liquid in a dispersed state in said sensing composition precursor.
Claim 10
Dependent Claim
22 words
The method of claim 8 wherein said hydrophilic dispersing agent is selected from the group consisting of hydroxyalkyl celluloses and mixtures thereof.
Claim 11
Dependent Claim
13 words
The method of claim 8 wherein said hydrophilic dispersing agent is hydroxyethyl cellulose.
Claim 12
Dependent Claim
19 words
The method of claim 1 wherein said sensing composition is effective in sensing the concentration of oxygen in blood.
Claim 13
Dependent Claim
43 words
The method of claim 1 wherein said transparent, gas permeable solid disc has a thickness across two substantially opposing ends only one of which is in contact with said sensing composition precursor in the range of about 0.005 inches to about 0.1 inches.
Claim 14
Independent Claim
120 words
A method for making a plurality of gas sensing elements useful in sensing the concentration of a gas in a medium comprising: placing sensing composition precursor in contact with an opaque, gas permeable film, said sensing composition precursor comprising a sensing component and a polymer precursor; placing a plurality of transparent, gas impermeable solid discs in contact with said sensing composition precursor; thereafter, forming from said sensing composition precursor sensing composition including gas permeable and light permeable polymeric material and said sensing component, said forming including reacting said polymer precursor; and forming individual gas sensing elements each of which includes one of said transparent, gas impermeable solid discs, a portion of said sensing composition and a portion of said film.
Claim 15
Independent Claim
120 words
A method for making a plurality of gas sensing elements useful in sensing the concentration of a gas in a medium comprising: placing sensing composition precursor in contact with an opaque, gas permeable film, said sensing composition precursor comprising a sensing component and a polymer precursor; placing a plurality of transparent, gas impermeable solid discs in contact with said sensing composition precursor; thereafter, forming from said sensing composition precursor sensing composition including gas permeable and light permeable polymeric material and said sensing component, said forming including reacting said polymer precursor; and forming individual gas sensing elements each of which includes one of said transparent, gas impermeable solid discs, a portion of said sensing composition and a portion of said film.
Claim 16
Dependent Claim
40 words
The method of claim 13 wherein said transparent, gas impermeable solid discs are made of glass, and said opaque, gas permeable film includes an opaque agent and a polymer selected from the group consisting of polyfluorohydrocarbons, polyfluorocarbons and mixtures thereof.
Claim 17
Dependent Claim
10 words
The method of claim 14 wherein said polymer is polytetrafluoroethylene.
Claim 18
Dependent Claim
26 words
The method of claim 13 wherein said sensing composition precursor further includes a cross-linking agent and said gas permeable and light permeable polymeric material is cross-linked.
Claim 19
Dependent Claim
47 words
The method of claim 13 wherein each of said plurality of transparent, gas permeable solid discs has a thickness across two substantially opposing ends only one of which is in contact with said sensing composition precursor in the range of about 0.005 inches to about 0.1 inches.
Claim 20
Independent Claim
140 words
A method for making a sensor useful in sensing the concentration of a gas in a medium comprising: placing sensing composition precursor between and in contact with a transparent, gas impermeable solid disc and an opaque, gas permeable film, said sensing composition precursor comprising a sensing component and a polymer precursor; thereafter forming from said sensing composition precursor sensing composition including gas permeable and light permeable polymeric material and said sensing component, said forming including reacting said polymer precursor, the combination comprising said sensing composition, said transparent, gas impermeable solid disc and said opaque, gas permeable film being referred to as a sensing element; and placing said sensing element at least partially in a cavity having an open end and being located in a substantially transparent sensor holder so that said opaque, gas permeable film is exposed to the medium.
Claim 21
Independent Claim
140 words
A method for making a sensor useful in sensing the concentration of a gas in a medium comprising: placing sensing composition precursor between and in contact with a transparent, gas impermeable solid disc and an opaque, gas permeable film, said sensing composition precursor comprising a sensing component and a polymer precursor; thereafter forming from said sensing composition precursor sensing composition including gas permeable and light permeable polymeric material and said sensing component, said forming including reacting said polymer precursor, the combination comprising said sensing composition, said transparent, gas impermeable solid disc and said opaque, gas permeable film being referred to as a sensing element; and placing said sensing element at least partially in a cavity having an open end and being located in a substantially transparent sensor holder so that said opaque, gas permeable film is exposed to the medium.
Claim 22
Dependent Claim
31 words
The method of claim 18 which further comprises testing said sensing element for efficacy in sensing the concentration of a gas in a medium prior to said sensing element placing step.
Claim 23
Dependent Claim
18 words
The method of claim 18 which further comprises securing said sensing element to said substantially transparent sensor holder.
Claim 24
Dependent Claim
25 words
The method of claim 18 wherein said sensing component is dissolved in an aqueous liquid dispersed in said gas permeable and light permeable polymeric material.
Claim 25
Dependent Claim
53 words
The method of claim 21 wherein said gas permeable and light permeable polymeric material is substantially ion impermeable, said dispersed aqueous liquid of said sensing composition is buffered and said sensing component is effective to provide a signal which varies as the pH of said dispersed aqueous liquid of said sensing composition varies.
Claim 26
Dependent Claim
42 words
The method of claim 22 wherein said dispersed aqueous liquid of said sensing composition has a pH in the range of about 6 to about 8 and the gas sensing element is effective in sensing the concentration of carbon dioxide in blood.
Claim 27
Dependent Claim
20 words
The method of claim 18 wherein the gas sensing element is effective in sensing the concentration of oxygen in blood.
Claim 28
Dependent Claim
40 words
The method of claim 18 wherein said solid disc has a thickness across two substantially opposing ends only one of which is in contact with said sensing composition precursor in the range of about 0.005 inches to about 0.1 inches.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |