| 摘要 |
A constant volume discharge device capable of reliably releasing air from a syringe. A constant volume discharge syringe (10) includes the syringe (1 2) and the constant volume discharge device (14). The constant volume discha rge device (14) has an outer tube (26) extending in the direction of arrow A , an inner tube (28) and spring (30) received in the outer tube (26), a lid member (32) fitted in the outer tube (26), a pressing member (34) inserted t hrough the outer tube (26), the inner tube (28), and the lid member (32), an d an operation member (36) attached to the outer tube (26). In preparatory o peration, the operation member (36) is moved to an initial position to a sto p position, and in operation subsequent to the preparatory operation, the op eration member (36) is moved from a standby position to the stop position. T he distance of movement of the pressing member (34) in the preparatory opera tion is greater than that of pressing member (34) in operation subsequent to the preparatory operation.
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