Abstract: A hemostatic powder comprises a chitosan salt together with at least one inert material. The disclosure also relates to hemostatic powders into which fluid penetrability is 0.5 cm or more within 1 minute. At least one medical surfactant may optionally be included. The hemostatic powders may be incorporated into wound dressings.

Abstract: A hemostatic powder comprises a chitosan salt together with at least one inert material. The disclosure also relates to hemostatic powders into which fluid penetrability is 0.5 cm or more within 1 minute. At least one medical surfactant may optionally be included. The hemostatic powders may be incorporated into wound dressings.

Abstract: A hemostatic powder comprises a chitosan salt together with at least one medical surfactant. At least one inert material may optionally be included. The hemostatic powder may be incorporated into wound dressings.

Abstract: A hemostatic powder comprises a chitosan salt together with at least one inert material. The disclosure also relates to hemostatic powders into which fluid penetrability is 0.5 cm or more within 1 minute. At least one medical surfactant may optionally be included. The hemostatic powders may be incorporated into wound dressings.

Abstract: A hemostatic powder comprises a chitosan salt together with at least one medical surfactant. At least one inert material may optionally be included. The hemostatic powder may be incorporated into wound dressings.

Abstract: The present invention provides novel methods of producing chitosan having a tap density of at least about 0.4 g/ml. In one aspect of the present invention, chitosan is selected having an average molecular mass of from about one thousand Daltons to about two million Daltons; a particle size that is smaller than 20 mesh; a viscosity of at least about 1 cps, and a percentage of deacetylation of from about 65% to about 98% A measured amount of the selected chitosan is then mixed with an amount of water that is from about two to about ten times the weight of the chitosan, and an amount of an acid that is at least about 0.1% of the weight of the chitosan. The acid is preferably an organic acid. The mixture of chitosan, water and acid is then mixed to a smooth paste, dried to a moisture content of from 0% moisture to about 20% moisture, and the particle size is preferably reduced to smaller than 20 mesh. In another aspect of the invention, chitosan is provided having a tap density of at least about 0.

Abstract: A flow sensor device includes a main passage having a normally open shut off valve therein which is configured to shut off at a predetermined rate of air flow therethrough. The shut off valve includes a seating structure and a centering structure positioned within the main passage, a sealing member being positioned between the seating structure and centering structure. The sealing member is biased toward the centering structure by a resilient member. Air flow through the main passage exerts a force on the sealing member which pushes the sealing member toward the seating structure. When the force caused by the air flow exceeds the opposing force of the resilient member, the sealing member contacts the seating structure in a sealing relationship such that air flow through the main passage is substantially eliminated. The flow sensor device may also include a controllable release valve and/or a controllable reset valve, enabling control of the shut off valve of the main passage.

Abstract: This disclosure is concerned with the demineralization of crustacea shells and the like, before or after protein removal therefrom, with sulfurous acid, thus to convert the calcium carbonate of the shell to calcium bisulfite solution which may be separated from the solid residual shell, and regenerating sulfurous acid from the said solution for reuse in the process.

Abstract: This disclosure is concerned with the use of chitosan as a coating or packing in fluid filtration and other systems to provide a high ratio of surface-to-volume of reactive material that exposes a maximum number of reactive amino groups for rapid reaction with fluid media passed therethrough.