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US5284775A Expired / Lapsed US ⏱️ 0.0 years remaining

Gas sensing element and method for making same

Assignee: Terumo Cardiovascular Systems Corp
•
Filing: 1992-09-21
•
Granted: 1994-02-08
•
Expires: 2012-09-21
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Abstract

Abstract Sensing composition precursors and sensing compositions, useful in sensing the concentration of a gas, e.g., carbon dioxide, in a medium, e.g., blood, are disclosed. In one embodiment, the sensing composition precursor comprises a dispersed aqueous liquid including a sensing component dissolved therein, a polymer precursor, and a hydrophilic dispersing agent selected from hydroxyalkyl celluloses and mixtures thereof in an amount effective to facilitate maintaining the dispersed aqueous liquid.

Inventors

  • 👤 Masao Yafuso
  • 👤 Mark Z. Holody
  • 👤 Thomas P. Maxwell
  • 👤 Thomas G. Hacker

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 01:32
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: 12
Claim 1
Independent Claim 45 words
A sensing composition precursor comprising a dispersed aqueous liquid including a sensing component dissolved therein, a polymer precursor, and a hydrophilic dispersing agent selected from the group consisting of hydroxyalkyl celluloses and mixtures thereof in an amount effective to facilitate maintaining said dispersed aqueous liquid.
Claim 2
Dependent Claim 45 words
A sensing composition precursor comprising a dispersed aqueous liquid including a sensing component dissolved therein, a polymer precursor, and a hydrophilic dispersing agent selected from the group consisting of hydroxyalkyl celluloses and mixtures thereof in an amount effective to facilitate maintaining said dispersed aqueous liquid.
Claim 3
Dependent Claim 15 words
The sensing composition precursor of claim 1 wherein said hydrophilic dispersing agent is hydroxyethyl cellulose.
Claim 4
Dependent Claim 27 words
The sensing composition precursor of claim 1 wherein said polymer precursor is a vinyl terminated dimethyl siloxane and said sensing composition precursor further includes a cross-linking agent.
Claim 5
Dependent Claim 29 words
The sensing composition precursor of claim 1 wherein said sensing component is selected from the group consisting of hydroxypyrene trisulfonic acid, derivatives of hydroxypyrene trisulfonic acid and mixtures thereof.
Claim 6
Dependent Claim 82 words
A sensing composition comprising: a gas permeable and light permeable polymeric material, a dispersed aqueous liquid including a sensing component dissolved therein, and a hydrophilic dispersing agent selected from the group consisting of hydroxyalkyl celluloses and mixtures thereof in an amount effective to facilitate maintaining aqueous liquid dispersed in a precursor of said sensing composition prior to forming said sensing composition, said precursor comprising a dispersed aqueous liquid including said sensing component dissolved therein, a polymer precursor and said hydrophilic dispersing agent.
Claim 7
Dependent Claim 82 words
A sensing composition comprising: a gas permeable and light permeable polymeric material, a dispersed aqueous liquid including a sensing component dissolved therein, and a hydrophilic dispersing agent selected from the group consisting of hydroxyalkyl celluloses and mixtures thereof in an amount effective to facilitate maintaining aqueous liquid dispersed in a precursor of said sensing composition prior to forming said sensing composition, said precursor comprising a dispersed aqueous liquid including said sensing component dissolved therein, a polymer precursor and said hydrophilic dispersing agent.
Claim 8
Dependent Claim 14 words
The sensing composition of claim 5 wherein said hydrophilic dispersing agent is hydroxyethyl cellulose.
Claim 9
Dependent Claim 39 words
The sensing composition of claim 5 wherein said polymeric material is substantially ion impermeable, said aqueous liquid is buffered and said sensing component is effective to provide a signal which varies as the pH of said aqueous liquid varies.
Claim 10
Dependent Claim 38 words
The sensing composition of claim 5 wherein said aqueous liquid has a pH in the range of about 6 to about 8 and wherein said sensing composition is effective in sensing the concentration of carbon dioxide in blood.
Claim 11
Dependent Claim 19 words
The sensing composition precursor of claim 1 wherein said hydrophilic dispersing agent is soluble in said dispersed aqueous liquid.
Claim 12
Dependent Claim 19 words
The sensing composition precursor of claim 5 wherein said hydrophilic dispersing agent is soluble in said dispersed aqueous liquid.

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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) 1997-02-07 1997-08-09 1998-02-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2001-02-07 2001-08-09 2002-02-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2005-02-07 2005-08-09 2006-02-08 $7700.00 Window Closed / Lapsed

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