Medical instrument used for storage of blood
AssigneeTerumo Kabushiki Kaisha
InventorYoshinori Ohachi
Life of this patent
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Abstract
A medical instrument is disclosed which is a shaped article of a resin composition comprising 100 parts by weight of a vinyl chloride type resin, 10 to 80 parts by weight of a di-n-alkyl ester of phthalic acid whose alkyl groups each possess 8 to 14 carbon atoms and whose numbers of carbon atoms in said alkyl groups average 9 to 14, and 1 to 18 parts by weight of a stabilizer. The medical instrument exudes only an extremely small amount of plasticizer and excels in permeability to gas.
Claims17
A medical instrument used for at least one of storage of blood and as a conduit for blood, said medical instrument having at least a part thereof which is in contact with blood when said medical instrument is in service, said part comprising a shaped resin composition, said composition comprising
- 100 parts by weight of a vinyl chloride type resin,
- from 10 to 80 parts by weight of a di-n-alkyl ester of phthalic acid of the formula ##STR2## wherein, m and n each is an integer of from 8 to 14 and (m+n)/2 has a value of from 9 to 14,
- from 1 to 15 parts by weight of an epoxy compound;
- and
- from 0.01 to 8 parts by weight of a metallic soap;
- the permeability coefficient of said shaped resin composition to carbon dioxide gas is not less than 2.5.times.10.sup.3 ml.multidot.mm/m.sup.2 .multidot.day.multidot.atm (at 30.degree. C.).
The method of preserving blood comprising storing blood in a blood bag, said blood bag having internal portions which contact the blood, said internal portions comprising a shaped resin composition, said composition comprising
- 100 parts by weight of a vinyl chloride type resin,
- from 10 to 80 parts by weight of a di-n-alkyl ester of phthalic acid of the formula ##STR3## wherein, m and n each is an integer of from 8 to 14 and (m+n)/2 has a value of from 9 to 14,
- from 1 to 15 parts by weight of an epoxy compound;
- and
- from 0.01 to 8 parts by weight of a metallic soap;
- the permeability coefficient of said shaped resin composition to carbon dioxide gas is not less than 2.5.times.10.sup.3 ml.multidot.mm/m.sup.2 .multidot.day.multidot.atm (at 30.degree. C.).
Dependencies are inferred from the claim text.