Air-pressure-balanced center needle type totally-enclosed safe dispensing device

The invention discloses an air-pressure-balanced center needle type totally-enclosed safe dispensing device. The air-pressure-balanced center needle type totally-enclosed safe dispensing device comprises a barrel (10), a sealing element (104), a piston (21), a push rod (22) and a dispensing needle comprising a first needle tube (11) and a second needle tube (13). Through local structure improvement, the device can effectively solve the problems of easy medicine leakage, inconvenience in operation, low pumping rate and the like caused by internal and external pressure difference of the medicine bottle in the medicine dispensing process, and achieves the purpose of totally-enclosed safe medicine dispensing on the premise of low cost. 本发明公开一种气压平衡的中心针型全封闭式安全配药装置，包括：筒体（10），密封件（104），活塞（21），推杆（22），包括第一针管（11）和第二针管（13）的配药针。该装置通过局部结构改进，可有效解决配药过程中因药剂瓶内外压差导致的药剂易泄露、操作不便、抽净率低等问题，在低成本前提下实现了全封闭式安全配药的目的。