| 摘要 |
A medicament delivery device 10 e.g. for infusion, comprising a first container 12 having a delivery outlet 16a at a front end thereof and a first stopper 14 axially moveable in the first container 12, the first stopper 14 defining and separating a first chamber 16 and a second chamber 18 in the first container 12, where the first chamber 16 is axially forwards of the first stopper 14 and the second chamber 16 is axially rearwards of the first stopper 14. The medicament delivery device further comprising a second container 20 having a second stopper 22 axially moveable in the second container20, the second stopper 22 defining and separating a third chamber 24 and a fourth chamber 26 in the second container 20, where the third chamber 24 is axially forwards of the second stopper 22 and the fourth chamber 26 is axially rearwards of the second stopper 22, and where the third chamber 24 has a vent outlet 24a in fluid communication with a venting chamber. The first stopper 14 is connected to the second stopper 22 by a tensile member 28 such that axially forwardly movement of the first stopper 14 causes axially forwardly movement of the second stopper 22 due to tensioning of the tensile member 28. The first stopper 14 is driveable in an axially forwardly direction, the first chamber 16 is configured to contain medicament for delivery through the delivery outlet 16a as the first stopper 14 moves axially forwards, the third chamber 24 contains a viscous fluid that enters the venting chamber via the vent outlet 24a as the second stopper 22 moves axially forwards, and the fourth chamber 26 has a pressure that is substantially equal to or greater than the pressure of the venting chamber. As the first stopper 14 is driven axially forwardly, the tensile member 28 is tensioned and causes the second stopper 22 to move axially forwardly and the venting of viscous fluid into the venting chamber via the vent outlet 24a retards the axially forward movement of the second stopper 22 and the first stopper 14. |
