Gas sensor
AssigneeCardiovascular Devices, Inc.
InventorsMasao Yafuso, John K. Suzuki
Life of this patent
Estimating the term…
Abstract
A gas sensor has a first aqueous phase. The aqueous phase is composed of a soluble dye in a buffer. One or more additional agent can be further added to the aqueous phase as for instance an emulisification enhancement agent. The aqueous phase is homogenized into a polymeric precursor forming a emulsion of the aqueous phase in the polymeric precursor. A catalyst and a cross-linking agent are added and the polymeric precursor material allowed to polymerize to form an emulsoid of micro-compartments of the aqueous phase in a polymeric second phase. The micro-compartments of the aqueous phase are dispersed through and permanently suspended in the polymeric second phase.
Claims26
A gas sensing composition which comprises:
- suspended dispersed microcompartments of an aqueous first phase in a cross-linked polymeric second phase wherein said aqueous first phase is present in micro-compartments smaller that 5 microns, said first phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent, and said second cross-linked polymeric phase comprising a gas permeable, light permeable, ion impermeable and substantially aqueous impermeable polymeric material.
A carbon dioxide gas sensing composition which comprises:
- a quantity of a first phase dispersed in a quantity of a second phase as a plurality of isolates smaller than 5 microns, said first phase comprising a quantity of hydroxypyrene trisulfonic acid in an aqueous buffer solution and said second phase comprises a quantity of a gas permeable, light permeable ion impermeable and substantially aqueous impermeable polymeric material.
A gas sensor which comprises:
- an aqueous phase having an aqueous soluble optical indicator dye dissolved therein;
- a gas permeable carrier body which is essentially aqueous impermeable and ion impermeable and is capable of transmitting light at least at selected wavelengths;
- a plurality of droplets of said aqueous phase dispersed in said carrier body, said droplets being supported by said carrier body;
- an optical fiber having an optical face;
- and
- said carrier body with said aqueous phase dispersed therein being located in association with said optical face of said optical fiber.
A gas sensing composition comprising:
- a gas permeable, light permeable ion impermeable and substantially aqueous impermeable matrix consisting essentially of a single polymeric material, said matrix having a plurality of micro-compartments dispersed therein;
- and
- an aqueous phase in said micro-compartments and substantially filling said micro-compartments, said aqueous phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent.
A gas sensor comprising:
- a gas sensing composition which comprises suspended dispersed micro-compartments of an aqueous first phase in a cross-linked polymeric second phase wherein said aqueous first phase is present in micro-compartments smaller than 5 microns, said first phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent, and said second cross-linked polymeric phase comprising a gas permeable, light permeable, ion impermeable and substantially aqueous impermeable polymeric material;
- and
- optical fiber means on which said gas sensing composition is located for transmitting signals from said gas sensing composition.
A carbon dioxide gas sensor comprising:
- a carbon dioxide gas sensing composition which comprises a quantity of a first phase dispersed in a quantity of second phase as a plurality of isolates smaller than 5 microns, said first phase comprising a quantity of hydroxypyrene trisulfonic acid in an aqueous buffer solution and said second phase comprises a quantity of gas permeable, light permeable, ion impermeable and substantially aqueous impermeable polymeric material and;
- optical fiber means on which said carbon dioxide gas sensing composition is located for transmitting signals from said carbon dioxide gas sensing composition.
A gas sensor comprising:
- a gas permeable, light permeable, substantially aqueous impermeable and ion impermeable matrix consisting essentially of a single polymeric material, said matrix having a plurality of micro-compartments dispersed therein;
- and
- an aqueous phase in said micro-compartments and substantially filling said micro-compartments, said aqueous phase comprising an aqueous buffer solvent and a solute, said solute including a dye soluble in said solvent;
- and
- optical fiber means on which said matrix is located for transmitting signals from said dye.
Dependencies are inferred from the claim text.