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1. (WO2017033910) AUTOMATIC ANALYSIS DEVICE, DISPENSING METHOD, AND LIQUID SURFACE DETECTION METHOD

Pub. No.:    WO/2017/033910    International Application No.:    PCT/JP2016/074459
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Wed Aug 24 01:59:59 CEST 2016
IPC: G01N 35/10
G01N 35/02
Applicants: HITACHI HIGH-TECHNOLOGIES CORPORATION
株式会社日立ハイテクノロジーズ
Inventors: YOSHIDA Gorou
吉田 悟郎
YAMAZAKI Isao
山崎 功夫
TAMEZANE Hideto
為實 秀人
NISHIDA Masaharu
西田 正治
Title: AUTOMATIC ANALYSIS DEVICE, DISPENSING METHOD, AND LIQUID SURFACE DETECTION METHOD
Abstract:
The present invention realizes an automatic analysis device which can improve accuracy of dispensing a specimen and a reagent by detecting a liquid surface position with high accuracy irrespective of presence/absence of a specimen or of a reagent container lid. A nozzle is lowered toward the liquid surface, a capacitance value detected during the lowering operation is stored in a memory, and when the nozzle is determined to have been lowered by a set lowering amount, the lowering operation is stopped (steps S10-S20). Whether a liquid exists or not is determined on the basis of the capacitance value, which is stored in the memory, at the height of the reagent container lid, and when a liquid exists, an abnormality process is performed (steps S20b, S80a). When it is determined at step S20b that a liquid does not exist, an operation of sucking a reagent is performed, a determination process of a pressure value by a pressure sensor and a determination process of the capacitance value are performed, and only when an abnormality such as air suction is determined, on the basis of a pressure waveform, to have not occurred and a liquid surface is determined to exist, normality is determined (step S50a). If an abnormality is determined at step S50a, an abnormality process such as generation of an alarm is performed (step S80).