PROBLEM TO BE SOLVED: To provide a drug solution delivery device capable of correctly delivering a drug solution by having a function of preventing an unintendedly excessive amount of drug solution such as insulin from being delivered into a human body, for example, in such a case that the insulin is delivered into the human body.SOLUTION: The device includes a restricting section 9 which is provided between a drug solution storing section 7 for storing a drug solution and a sending section 10 for sending the drug solution to the outside and flows the drug solution when the sending section 10 has a negative pressure and stops the flow of the drug solution when the drug solution storing section 7 has a positive pressure. With this configuration, when the sending section 10 is driven to deliver the drug solution, the restricting section 9 communicates a flow path from the drug solution storing section 7 to the sending section 10 to enable the drug solution stored in the drug solution storing section 7 to be delivered to a user via the sending section 10. When a lower casing 2 or an upper casing 3 is deformed due to an applied external force and a positive pressure is applied to the drug solution storing section 7, the restricting section 9 closes a flow path from the drug solution storing section 7 to the sending section 10. Thus, even if a positive pressure is applied to the drug solution storing section 7, the drug solution can be prevented from being delivered into users body via the sending section 10, resulting in correct delivery of the drug solution.COPYRIGHT: (C)2013,JPO&INPIT【課題】本発明は、薬液を正確に投与する。【解決手段】本発明は、薬液を貯蔵する薬液貯蔵部7と薬液を外部に送出する送出部10との間に、送出部10側が陰圧になると薬液を流し、薬液貯蔵部7側が陽圧になると薬液の流れを停止させる制限部9を設けたので、送出部10が駆動されて薬液を投与する場合には制限部9が薬液貯蔵部7から送出部10までの流路を連通させ、薬液貯蔵部7に貯蔵された薬液を送出部10を介して使用者に投与することができる一方、外力が加えられて下筐体部2や上筐体部3が変形して薬液貯蔵部7に陽圧がかかった場合には制限部9が薬液貯蔵部7から送出部10への流路を塞ぐので、薬液貯蔵部7に陽圧がかかっても薬液を送出部10を介して使用者の体内に投与させてしまうことを防止することができ、かくして薬液を正確に投与することができる。【選択図】図5
