PROBLEM TO BE SOLVED: To provide a convenient production method for a body-implanted medical material, useful as an adhesion prevention film having flexibility and high strength, excellent visibility after implanted in a body, and excellent practical utility, and a body-implanted medical material produced by the production method.SOLUTION: A method for producing a body-implanted medical material includes the step of treating a raw material film containing water-soluble salt of hyaluronic acid and a contrast medium, with a treatment liquid containing an acid anhydride, and insolubilizing the raw material film in water, where the contrast medium is a water-soluble contrast medium or an impalpable powder-like water-insoluble contrast medium with a particle size of 1 μm or less.SELECTED DRAWING: None【課題】柔軟かつ高強度であるとともに、体内埋植後の視認性が良好な、実用性に優れた癒着防止膜として有用な体内埋植用医療材料の簡便な製造方法、及びその製造方法によって製造される体内埋植用医療材料を提供する。【解決手段】ヒアルロン酸の水溶性塩及び造影剤を含有する原料フィルムを、酸無水物を含む処理液で処理し、原料フィルムを水不溶化させる工程を有し、造影剤が、水溶性造影剤又は粒子径１μｍ以下の微粉末状の水不溶性造影剤である体内埋植用医療材料の製造方法である。【選択図】なし
