| 摘要 |
<p>Balloon catheters are formed from low molecular weight polyethylene terephthalate with an intrinsic viscosity of 0.9 dL/g or less by placing tubing of such material in a mold cavity whose diameter exceeds that of the tubing by the desired degree of expansion, and pressurizing the tubing while heating the mold to a temperature exceeding both the first and second order transition temperatures of the PET from which the tubing was made, so that the tubing expands to fill the mold cavity. The resulting balloon is characterized by an unusually high toughness combined with superior flexibility and softness of feel.</p> |
