PROBLEM TO BE SOLVED: To provide an indwelling type medical device that allows sufficient amount of information to be visually recognized before embedding, and allows minimum information to be visually recognized through an X-ray after embedding.SOLUTION: An indwelling type medical device indwelled in a body includes: a body including a base part enclosing at least part of a liquid reservoir part 50 and a lid body for covering a storage space together with the base part； and a sign part 22 including a sign body 222, which is at least one of a character, a mark, and a graphic on a medicine injection port. The sign part 22 is configured so as to include a visible part which is made visible under X-ray observation by a difference in X-ray transmissivity between the sign body 222 and a peripheral area 221 of the sign body 222, and an invisible part which is made difficult to be visually recognized under X-ray observation by the X-ray transmissivity being roughly the same in the sign body 222 and the peripheral area 221 of the sign body 222.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2020,JPO&INPIT【課題】埋め込み前は充分な量の情報を視認可能であって、埋め込み後はＸ線を通して最小限の情報を視認可能な留置型医療機器を提供する。【解決手段】体内に留置される留置型医療機器を、液溜部５０の少なくとも一部を内包する基部と、基部と共に貯留空間を覆う蓋体と、を含む本体と、薬液注入ポートに関する文字、マークまたは図形の少なくとも一つである標識体２２２を含む標識部２２と、を有し、標識部２２は、標識体２２２と標識体２２２の周囲領域２２１とでＸ線の透過率が異なることによってＸ線観察下で視認される視認部と、標識体２２２と標識体２２２の周囲領域２２１とでＸ線の透過率が略同一であることによりＸ線観察下で視認困難な非視認部と、を有するように構成する。【選択図】図６
