Abstract: The present invention provides a blood-compatible composition containing an ionic complex consisting of an organic cationic compound and heparin or a derivative thereof, wherein the organic cationic compound is an ammonium or a phosophonium bound with four aliphatic alkyl groups, the four aliphatic alkyl groups having a total number of carbon atoms of 24 to 32, and has at least 2 alkyl groups having not less than 10 carbon atoms. A medical device capable of long-term sustention of antithrombogenicity can be produced by coating the surface of the medical device with the composition.

Abstract: There is disclosed a draining cannula to be connected with the left atrium which comprises a tip portion (A), a curvature portion (B) connected with said tip portion and a body tubular portion (C) connected with said curvature portion. The length and the outer diameter of said cannula is sufficient for inserting the cannula into the femoral vein and for reaching the tip portion the left atrium passing through the cava, the right atrium and the interatrial septum. The portion (B) is made of a material which is more flexible than that of said portion (C). A resilient spiral thin wire is provided within the thickenss of the wall part defining the lumen of the curvature portion (B). The cannula is used for draining from the left atrium by inserting it into the femoral vein and passing the tip portion (A) of said cannula through the cava, the right atrium and the interatrial septum to reach the left atrium, without thoracotomy.

Abstract: A gas-permeable material with excellent compatibility with blood comprising polyurethane, polyurethaneurea, or the derivatives thereof is provided. The polyurethane or polyurethaneurea is obtained from a composition that comprises diisocyanate; polysiloxane containing terminal hydroxyl groups; and polyol or polyamine containing at least one tertiary amino gorup. The derivatives of the polyurethane or polyurethaneurea is obtained by the following steps of: converting the tertiary amino groups contained in the polyurethane or the polyurethaneurea to quarternary ammonium groups, and treating the polyurethane or the polyurethaneurea having quarternary ammonium groups with heparin.

Abstract: A process for the production of a pulp from bast fibers, which includes reacting a mixture of the bast fibers and an aqueous digestion liquid at a temperature of 60.degree.-130.degree. C. The digestion liquid includes (a) hydrogen peroxide or a compound capable of generating hydrogen peroxide in the presence of water, (b) an alkali metal carbonate, and (c) an oxalate.

Abstract: A water-absorbent excellent in water-holding capacity under pressure, which comprises a cotton-like material A manufactured by a pulping treatment of bagasse containing pith and having a lignin content of at least 5% by weight and a cotton-like fibers B having a lignin content of not greater than 5% by weight. This water-absorbent is suitable as a sanitary material for manufacturing diapers, hygienic napkins or tampons.