Saitin Jiko na Jiki (saitin IV) shine yanayin mafi sauri don shigar da magani ko maye gurbin ruwa a cikin jiki daga bakararre gilashin buhunan IV ko kwalabe. Ba a amfani da shi don samfuran jini ko jini. Ana amfani da jiko da aka saita tare da iska don watsa ruwan IV kai tsaye zuwa cikin jijiyoyi.