PROBLEM TO BE SOLVED: To provide a liquid medicine syringe with which a patient can inject a correct amount of liquid medicine into his or her own body after reserving the liquid medicine to be injected up to a necessary and sufficient amount predetermined by a doctor.SOLUTION: The syringe is provided with: a reserver 12 for reserving the liquid medicine a supply side tube 13 for supplying the reserver 12 with the liquid medicine a discharge side tube 14 for discharging the liquid medicine from the reserver 12 and a pressure mechanism 20 for sending the liquid medicine stored in the reserver 12 to the discharge side tube 14 by pressing the reserver 12. The reserver is configured so that it swells as the liquid medicine supplied by the supply side tube 13 is reserved, and is provided with a pressure regulation mechanism 30 which regulates pressure of the reserver 12 by the pressure mechanism 20 until the amount of swell of the reserver 12 reaches the predetermined capacity and permits the pressure of the reserver 12 by the regulating pressure mechanism 20 when the amount of well of the reserver 12 has reached the predetermined capacity.COPYRIGHT: (C)2009,JPO&INPIT【課題】注入される薬液を、医師が予め定めていた必要十分量まで貯留させて、患者自身が正しい注入量で自己の体内に注入することができる薬液注入器。【解決手段】薬液を貯留するリザーバ12と、リザーバ12に薬液を供給する供給側チューブ13と、リザーバ12から薬液を排出する排出側チューブ14と、リザーバ12を押圧することによりリザーバ12に貯留された薬液を排出側チューブ14に送る押圧機構20とを備え、リザーバ12は、供給側チューブ13から供給される薬液の貯留にしたがって膨張するように構成され、リザーバ12の膨張量が予め定めた容量に達するまでは押圧機構20によるリザーバ12の押圧を規制し、かつリザーバ12の膨張量が予め定めた容量に達した場合には規制していた押圧機構20によるリザーバ12の押圧を許可する押圧規制機構30が設けられている。【選択図】図2
