Method for producing coated medical device

A method for manufacturing a coated medical device, comprising:

• (A) a contacting step of housing a medical device in a container, and bringing said medical device into contact with a solution a containing a hydrophilic polymer A;
• and
• (C) a heating step of heating said container;
• wherein said hydrophilic polymer A is a polymer containing, as a monomer unit, a compound a1 having a quaternary ammonium cation group represented by the following general formula (I):
• wherein, in the general formula (I), R1 represents an optionally substituted C1-20 divalent organic group;
• and R2 to R4 each independently represent a C1-16 alkyl group or a C6-18 aryl group;
• wherein said hydrophilic polymer A further contains, as a monomer unit, a compound a2 having a structure represented by the following general formula (II):
• wherein, in the general formula (II), L1 represents a hydrogen atom or a methyl group;
• X represents an oxygen atom or NA2, wherein A2 represents a hydrogen atom or an alkyl group;
• m represents an integer of 1 to 30;
• and Y represents methyl group, ethyl group, propyl group, isopropyl group, or butyl group;
• wherein, with respect to 100% by mass of the whole hydrophilic polymer A, a content of the compound a1 is 5% by mass or more and 90% by mass or less, and a content of the compound a2 is 10% by mass or more and 80% by mass or less;
• and
• wherein the pH of the solution a after said heating step is 6.1 to 8.0.