indwelling
adjective medical specialized uk/ˈɪn.dwel.ɪŋ/ us/ˈɪnˌdwel.ɪŋ/
留在体内的，留置的（设备）
relating to a device that is left inside the body, for example a catheter (= a long, thin tube used to take liquids out of the body)
Indwelling catheters are used during labour following epidural anaesthesia. 产妇生产时，可以在硬膜外麻醉之后使用留置导管。