At the position where the component which it was melted was processed differs the medical device which possesses the crystallization quality which differs. The said component is formed from the said polymer composition which includes the polymer crystallization modifier in the composition which forms at least the portion of the said component, the quantity of the said polymer crystallization modifier is modified following to the difference of the desire regarding the quality of crystallization, at the position where the said component differs.溶融加工された構成要素が異なる位置にて異なる結晶化特性を有する医療装置。該構成要素は、該構成要素の少なくとも一部を構成する組成物中にポリマー結晶化改質剤を含んだ該ポリマー組成物から形成され、該ポリマー結晶化改質剤の量は、結晶化の特性に関する所望の差に従って該構成要素の異なる位置にて変更される。