and wrapped upon itself to reduce the diameter to enable it to be easily introduced into a body part when inflation fluids are introduced into lumen 16 the balloon 14 will expand to a generally cylindrical shape a layer of biocompatible anti blocking agent 12 is disposed on a layer of hydrogel coating 11 the anti blocking agent layer 12 has a thickness between 1 and 10 u03bcm the hydrogel coating 11 has a thickness between about 1 and 10 u03bcm the hydrogel coating 11 is a lubricious hydrophilic material water soluble polymers can be used which are generally chain structured non crosslinked polymers having a hydrophilic group such as oh conh 2 cooh nh 2 coo so 3 and nr 3 where r is alkyl or hydrogen also used are natural water soluble polymers such as carboxymethyl cellulose cmc methyl cellulose mc hydroxyethyl cellulose hec and hydroxypropyl cellulose hpc synthetic water soluble polymers polyethylene oxide polyethylene glycol and methoxypolyethylene glycol are also used maleic anhydride polymers e g methyl vinyl ether maleic anhydride copolymers were also used moreover also used are water soluble nylons and pyrrolidones e g polyvinyl pyrrolidone the derivatives of these polymers are not limited to water soluble ones but may be of any form so long as they have as a basic structure the water soluble polymer as mentioned above insolubilized derivatives are also employed so long as they have freedom in the molecular chain and can.