Method of producing medical instrument

An intraocular lens insertion instrument comprising:

• an instrument body of generally tubular shape accommodating an intraocular lens set therein, and including an insertion tube portion disposed at an axial distal end section of the instrument body;
• and
• a plunging member inserted into the instrument body from an axial rear and adapted to move the intraocular lens axially forward while inducing deformation of the lens to smaller size and plunging the lens into an eye through the insertion tube portion, wherein:
• a surface of an interior of the insertion tube portion is imparted with hydrophilicity and lubricity by a coating layer formed thereon;
• and
• the coating layer is composed of a crosslinked, chemically processed film produced by a coating solution preparation step in which at least a water-insoluble polymer with a carboxyl group which is selected from the group consisting of hydroxypropyl methylcellulose phthalate, hydroxylpropyl methycellulose succinate acetate, cellulose phthalate acetate, and mixtures thereof, and a polyfunctional reactive compound are dissolved in an organic solvent to obtain a coating solution;
• an application step in which the coating solution is applied to the surface of the instrument to form the coating layer;
• a crosslinking step in which the coating layer undergoes crosslinking;
• and a chemical reaction step in which a chemical reaction process that is an alkali treatment is carried out to bring about hydrophilization of the crosslinked coating layer.