Device and production method for the same

A method for producing a device,

• wherein the device comprises a substrate and a hydrophilic polymer which is a copolymer of a monomer having a hydroxyl group and a monomer having an amide group, the hydrophilic polymer being separated into two or more layers having a thickness of 10 nm or more and 80 nm or less as measured in a frozen state, and wherein one of the two or more hydrophilic polymer layers is fixed to at least a part of a surface of the substrate,
• the method comprising disposing the substrate in a solution containing the hydrophilic polymer, and then fixing the hydrophilic polymer to at least a part of a surface of the substrate by heating the solution in which the substrate is disposed to obtain the device, where the pH of the solution at the time the heating is started is 2.0 or higher to 6.0 or lower,
• wherein a liquid film retention time of the device is 20 seconds or more,
• wherein the monomer having a hydroxyl group is selected from the group consisting of methacrylic acid, acrylic acid, vinylbenzoic acid, thiophene-3-acetic acid, 4-styrenesulfonic acid, vinylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, and salts thereof,
• wherein the monomer having an amide group is selected from the group consisting of N-vinylpyrrolidone and N,N-dimethylacrylamide,
• wherein lipid is not deposited on the device when the device is subjected to measurement of a lipid deposition amount according to the following method:
• the device, 0.03 g of methyl palmitate as a lipid and 10 g of pure water were placed in a 20 cc screw tube, followed by shaking of the screw tube for 3 hours at 37° C. and 165 rpm, followed by scrubbing the device with tap water at 40° C. and a liquid detergent, after which the device is placed in a screw tube containing a phosphate buffer solution and stored at 4° C. for 1 hour before being visually observed, with the result that if a turbid portion existed, the methyl palmitate was judged to be deposited.