Haemostatic material
AssigneeMedtrade Products Limited
InventorsCraig Hardy, Andrew Darby, Guy Eason
Life of this patent
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Abstract
The present invention relates to a haemostatic material comprising a carrier layer and a material for wound contact comprising at least one haemostat in particulate, granular, powder, flake or short fibrous form. Such a haemostatic material is useful, for example, in reducing or stopping bleeding of a physiological target site in a person or animal, and can also be used to stem bleeding during medical procedures.
Claims31
A haemostatic material comprising:
- a carrier layer comprising a non-woven material, woven gauze, a film, a foam or a sheet gel, and
- a wound contact layer being a single layer comprising a mixture of at least one haemostat and an adhesive, the wound contact layer being bonded directly to the carrier layer,
- wherein the at least one haemostat is in a form selected from the group consisting of:
- particulate, granular, powder, flake, and short fibrous, wherein said haemostat comprises a chitosan salt, and
- wherein the haemostat or adhesive is sufficiently water sensitive to weaken the bond between the haemostat and the adhesive upon contact with a fluid, such that when the wound contact layer is wet with blood a portion of the haemostat will remain at the wound site if the carrier layer is removed.
A haemostatic material according 1 wherein the chitosan salt constitutes at least about 5% by weight of the haemostat.
A haemostatic wound dressing comprising:
- a dressing and
- a haemostatic material comprising
- a carrier layer comprising a non-woven material, woven gauze, a film, a foam or a sheet gel, and
- a wound contact layer being a single layer comprising a mixture of at least one haemostat and an adhesive, the wound contact layer being bonded directly to the carrier layer,
- wherein the at least one haemostat is in a form selected from the group consisting of:
- particulate, granular, powder, flake, and short fibrous,
- wherein said haemostat comprises a chitosan salt, and wherein the haemostat or adhesive is sufficiently water sensitive to weaken the bond between the haemostat and the adhesive upon contact with a fluid, such that when the wound contact layer is wet with blood a portion of the haemostat will remain at the wound site if the carrier layer is removed.
A haemostatic material for application to a wound site, comprising:
- a carrier layer comprising a non-woven material having an upper surface and a lower surface;
- and
- a haemostatic wound contact layer adhered to the upper surface of said carrier layer,
- said haemostatic wound contact layer comprising a mixture of chitosan salt haemostat and a bonding agent, said mixture being applied directly to said upper surface of said carrier layer by heat, said wound contact layer being a single layer,
- said chitosan salt haemostat being provided in a physical form selected from the group consisting of powder, particulate, granular, flake and fiber,
- said bonding agent being provided in a granular form, said bonding agent being at least partially water soluble,
- wherein said haemostat and said bonding agent are mixed together prior to application to said carrier material, scatter coated onto said carrier material, and adhered to said carrier material by heat thus forming a water soluble wound contact layer on said upper surface of said carrier material,
- said wound contact layer being sufficiently water sensitive to weaken the adhesive bonds when the wound contact layer is wet thus releasing the haemostat from the wound contact layer for therapeutic effect and whereby at least a portion of the haemostat remains in the wound when the carrier layer is removed.
Dependencies are inferred from the claim text.