초록 ▼

A catheter, preferably a balloon-type catheter, is disclosed in which the catheter shaft is made of a thermoplastic material and thus may be extrudable, the shaft consisting essentially of (a) from 40 to 70 percent by weight of an elastic composition which comprises: from 50 to 99.5 percent by weigh

A catheter, preferably a balloon-type catheter, is disclosed in which the catheter shaft is made of a thermoplastic material and thus may be extrudable, the shaft consisting essentially of (a) from 40 to 70 percent by weight of an elastic composition which comprises: from 50 to 99.5 percent by weight of a block copolymer having thermoplastic rubber characteristics with a central, rubbery polyolefin block and terminal blocks of polystyrene, and optionally including up to about 45 percent by weight of polypropylene, plus from 0.5 to 10 percent by weight of a cross-linked organic silicone elastomer; and (b) from 30 to 60 percent by weight of a hydrophobic oil-type plasticizer to provide the desired degree of softness to said elastic composition.

대표청구항 ▼

A catheter which comprises a tubular shaft, said shaft consisting essentially of (a) from 40 to 70 percent by weight of an elastic composition which comprises: from 50 to 99.5 percent by weight of a block copolymer having thermoplastic rubber characteristics with a central rubbery polyolefin block a

A catheter which comprises a tubular shaft, said shaft consisting essentially of (a) from 40 to 70 percent by weight of an elastic composition which comprises: from 50 to 99.5 percent by weight of a block copolymer having thermoplastic rubber characteristics with a central rubbery polyolefin block and terminal blocks of a polystyrene; said block copolymer exhibiting a Brookfield viscosity at 25°C. of 10 to 2000 cps., when measured using a 10 percent by weight solids solution in toluene, said composition including from 0 to 45 percent by weight of polypropylene, and from 0.5 to 10 percent by weight of a crosslinked, organic silicone elastomer which is the reaction product of an organopolysiloxane containing from one to five percent by weight of siloxane units which contain silicon-bonded vinyl groups, and an organopolysiloxane material containing silicon-bonded hydrogen; and (b) from 30 to 60 percent by weight of a hydrophobic oil-type plasticizer to provide the desired degree of softness to said elastic composition.