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US 9,829,471 B2Granted
pH indicator device and formulation
AssigneeSmith & Nephew, Inc.
InventorsVictoria Jody Hammond, John Kenneth Hicks
Life of this patent
Estimating the term…
Abstract
Disclosed herein are devices and methods for determining the pH of fluid. Example devices include a device comprising a surface configured to contact the fluid and a pH indicator covalently bound thereto, wherein the pH indicator has a first color prior to contact with the fluid and changes color as a function of the pH of the fluid.
Claims16
A wound dressing configured to determine the pH of a fluid, the wound dressing comprising:
- an absorbent layer configured to be positioned over a wound;
- a pH indication layer over the absorbent layer, the pH indication layer comprising a pH indicator covalently immobilized thereon;
- wherein the pH indicator is configured to have a first color prior to contact with the fluid and changes color as a function of the pH of the fluid;
- and
- wherein the pH indicator comprises 2-[(4-(2-hydroxyethylsulfonyl)-phenyl)diazenyl]-4-methylphenol and 4-[4-(2-hydroxyethylsulphonyl)-phenylazo]-2,6-dimethoxy phenol in about a 2:1 ratio.
2 more elements
A wound dressing, comprising:
- a wound-contacting surface,
- an opposing non-wound contacting surface,
- a pH indication zone comprising a pH indicator covalently bound therein, which indicates the pH of a fluid, wherein the color of the pH indicator changes in response to a change in the pH of the fluid;
- an adhesive layer;
- at least one conduit for directing fluid towards the pH indication zone, the conduit configured to wick fluid directly to the pH indication zone without altering the pH of the fluid;
- and
- wherein the pH indicator comprises 2-[(4-(2-hydroxyethylsulfonyl)-phenyl)diazenyl]-4-methylphenol and 4-[4-(2-hydroxyethylsulphonyl)-phenylazo]-2,6-dimethoxy phenol in about a 2:1 ratio.
4 more elements
Dependencies are inferred from the claim text.