US PATENT SUBCLASS 604 / 368
.~.~.~ Collagen or gelling material

Current as of: June, 1999
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604 /   HD   SURGERY

317  DF  MEANS AND METHODS FOR COLLECTING BODY FLUIDS OR WASTE MATERIAL (E.G., RECEPTACLES, ETC.) {5}
358  DF  .~ Absorbent pad for external or internal application and supports therefor (e.g., catamenial devices, diapers, etc.) {13}
367  DF  .~.~ Containing particular materials, fibers, or particles {6}
368.~.~.~ Collagen or gelling material

DEFINITION

Classification: 604/368

Collagen or gelling material:

(under subclass 367) Subject matter wherein the collecting means contains a component derived from fibrous protein found in animal connective tissue or a chemical composition which is a natural or synthetic hydrocolloid, both of which are capable of absorbing and retaining water or body fluids in chemical combination and which swells to form a gel-like mass.

(1) Note. Patents in this subclass disclose collagen or hydrocolloids in powder or granulated form disposed either in an envelopelike container with a liquid pervious cover sheet which is a layer of the absorbent pad or as a powder mixer in with a fiber layer or secured to the fiber layer by an adhesive.

(2) Note. Hydrocolloid compounds do not release the absorbent water but maintain it in chemical balance in the gel which is formed. Examples, though not exhaustive, of natural hydrocolloids are:

agar agar gum karaya algin gum tragacanth casein polysaccaharides dextran proteins (albumen) gelatin starches guar gums

Illustrative polymers which can be employed as hydrogels include, amoung others:

Ammonium polyacrylates Anionic polyacrylamide Carboxymethyl cellulose Ethylene-maleic anhydride copolymers Hydroxyalkoxalkyl acrylates Hy-droxyalkoxalkyl methacrylates Hy-droxyalkyl acrylates Hydroxyalkyl methacrylates Hydroxyethyl-carboxy-methyl cellulose Hydroxyethyl cellulose Hydroxy propyl cellulose Maleic anyhydride-vinylether copolymers Methyl cellulose Polyacrylamide Polyacrylic acid Polyethylene glycol Polyethyleneimine Poly(ethylene oxide) Polymethacrylic acid Polystyrene sulfonic acid Polyvinylalcohol Polyvinylamine Polyvinylethers Polyvinyl pyrrolidone Polyvinylsulfonic acid Propyleneglycol alginate Sodium alginate

SEE OR SEARCH THIS CLASS, SUBCLASS: 376, for sodium carboxymethyl cellulose which has gel-like properties.

SEE OR SEARCH CLASS

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

98+, for colloid systems of continuous or semicontinuous solid phase with discontinuous liquid phase (gels, pastes, flocs, coagulates) or agents for such systems or making or stabilizing such systems or agents, when generically claimed or when there is hierarchically superior provision in the

USPC for the specifically claimed art.

536, Organic Compounds,

102, for starch compositions.