Radiopaque polyurethane resin compositions
OwnerVincent J. Flynninventor
Life of this patent
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Abstract
Radiopaque compositions are provided by formulating polyurethane resins, alone, or combined with vinyl resins, with alkyl or alkoxyalkyl 2,5-diiodobenzoates, 2,3,4,6-tetraiodobenzoates or mixtures thereof. The compositions are useful in the manufacture of X-ray opaque medical devices, particularly medical surgical tubing. Surgical tubing with excellent plastic memory is provided, well adapted to forming flares and curved tips necessary for selective renal and celial arteriography. Multi-wall and co-tapered multiwall tubing constructions are also disclosed.
Claims9
A medical-surgical catheter formed from tubing comprising
- (a) a resin which includes from 100 to 33 parts by weight of a thermoplastic polyurethane and from 0 to 67 parts of a polymer of a halogenated vinyl monomer;
- and
- (b) a radiopacifier therefor consisting of a diiodobenzoate or a tetraiodobenzoate compound of the formula ##STR2## wherein R.sup.1 is hydrogen or iodo, and R is alkyl or alkoxyalkyl or a mixture of said compounds, said radiopacifier (b) comprising 10 to 40 parts by weight per 100 parts by weight of (a) and (b).
A medical-surgical catheter tubing comprising (1) an interior tubular portion of a radiopaque composition comprising
- (a) a resin which includes from 100 to 33 parts by weight of a thermoplastic polyurethane and from 0 to 67 parts of a polymer of a halogenated vinyl monomer;
- and
- (b) a radiopacifier therefor consisting of a diiodobenzoate or tetraiodobenzoate compound of the formula ##STR3## wherein R.sup.1 is hydrogen or iodo, and R is alkyl or alkoxyalkyl and a mixture of said compunds, said radiopacifier (b) comprising 100 to 40 parts by weight per 100 parts by weight of (a) and (b),
- and (2) a concentric outer shell of (a) a vinyl resin as defined above under (1) (a) and which further includes a minor proportion of a radioparent plasticizer and a minor proportion of a heat stabilizer for said vinyl resin;
- (b) nylon or (c) polypropylene.
A medical-surgical catheter tubing comprising (1) an interior tubing portion of nylon or polypropylene and (2) a concentric outer shell of a radiopaque composition comprising
- (a) a resin which includes from 100 to 33 parts by weight of a thermoplastic polyurethane and from 0 to 67 parts of a polymer of a halogenated vinyl monomer;
- and
- (b) a radiopacifier therefor consisting of a diiodobenzoate or a tetraiodobenzoate compound of the formula ##STR4## wherein R.sup.1 is hydrogen or iodo, R is alkyl or alkoxyalkyl and a mixture of said compounds, said radiopacifier (b) comprising 10 to 40 parts by weight per 100 parts by weight of (a) and (b).
Dependencies are inferred from the claim text.