| 摘要 |
An infusion device for dispensing drugs and other fluids at controlled rates over extended time periods. The device includes a syringe section and a power section that are connected together in use, the power section having a casing defining a first chamber containing a vacuum-stable viscous liquid and a second chamber under partial vacuum. A metering passage extends between the two chambers, and a piston is slidably received in the casing and constitutes a movable wall of the first chamber so that as the viscous liquid gradually flows through the metering passage into the second chamber the piston retracts slowly to cause fluid to be discharged from the syringe. |
