PROBLEM TO BE SOLVED: To reduce cost.SOLUTION: An accident determination system comprises a determination unit that determines, on the basis of a signal received by a reader, whether or not a chemical is present and whether or not a needle is removed. An electrode section of the reader, a first tag and a second tag are attached to a tube for intravenous drip. The electrode section of the reader and the first tag are separated from each other at a distance that makes it possible for the reader to receive a signal from the first tag when the chemical flows through the tube, and makes it impossible for the reader to receive the signal from the first tag when the chemical does not flow through the tube. The electrode section of the reader and the second tag are separated from each other at a distance that makes it impossible for the reader to receive a signal from the second tag when the chemical flows through the tube and part of the tube between the electrode section of the reader and the second tag is in contact with a human body, and makes it possible for the reader to receive the signal from the second tag when the chemical flows through the tube and the part of the tube between the electrode section of the reader and the second tag is not in contact with the human body.COPYRIGHT: (C)2015,JPO&INPIT【課題】コストを抑える。【解決手段】リーダの受信信号に基づき薬液の有無、注射針の抜去の有無を判定する判定部を備え、リーダの電極部、第1タグ、第2タグを点滴用チューブに取り付け、リーダ電極部と第1タグとの距離は、チューブに薬液が流れているときに第1タグからの信号をリーダで受信可能な距離であって、チューブに薬液が流れていないときに第1タグからの信号をリーダで受信不可能な距離であり、リーダ電極部と第2タグとの距離は、チューブに薬液が流れ、かつリーダ電極部と第2タグとの間のチューブの一部が人体に接触しているときに第2タグからの信号をリーダで受信不可能な距離であって、チューブに薬液が流れ、かつリーダ電極部と第2タグとの間のチューブの一部が人体に接触していないときに第2タグからの信号をリーダで受信可能な距離である。【選択図】図1
