Medical instrument, cell culture method, fluorine-containing cyclic olefin polymer and fluorine-containing cyclic olefin polymer composition for it, and cultured cells

A method for culturing cells, comprising:

• a step of inoculating cells over a surface of a substrate of a medical instrument so as to be in contact with or held on the surface;
• a step of obtaining cultured cells by culturing the cells;
• and
• a step of floating the cultured cells from the surface by adding a buffer solution over the surface and then separating the cultured cells from the surface by adding a buffer solution over the surface on which the cultured cells are formed,
• wherein the medical instrument comprises the substrate;
• wherein cells are in contact with or held on the surface of the substrate, and
• at least the surface of the substrate which holds the cells is formed of a fluorine-containing cyclic olefin polymer which contains a repeating structure unit represented by Formula (1),
• wherein in Formula (1), at least one of R1 to R4 is fluorine, an alkyl with 1 to 10 carbon atoms which contains fluorine, an alkoxy with 1 to 10 carbon atoms which contains fluorine, or an alkoxyalkyl with 2 to 10 carbon atoms which contains fluorine, R1 to R4 are selected from hydrogen, an alkyl with 1 to 10 carbon atoms, an alkoxy with 1 to 10 carbon atoms, or an alkoxyalkyl with 2 to 10 carbon atoms in a case where R1 to R4 are groups which do not contain fluorine, R1 to R4 may be the same as or different from each other, and R1 to R4 may be bonded to each other to form a cyclic structure,
• wherein a water contact angle of the surface which is in contact with or holds cells is equal to or more than 80° and equal to or less than 110°,
• wherein, in the step of obtaining cultured cells, the cells are proliferated so as to form a colony in the thickness direction,
• wherein the medical instrument is a bag, a tube, a petri dish, a multi-well plate, or a flask, and
• wherein at least the surface of the substrate which holds the cells is not provided with a convex-concave structure.