Injection device and method for drug delivery

Method and apparatus body implanted device, for example, supplies the treatment fluid into such container device implanted in a patient's eye. The method and apparatus, injectors to increase the amount of injected therapeutic agent into the device implanted in the eye, or structure for receiving a treatment fluid in the implanted device to the eye, or a combination thereof it may be provided. Device implanted in the eye may comprise a reservoir chamber having a treatment fluid and the different densities of the fluid, the apparatus, in order to increase the amount of therapeutic fluid disposed in the reservoir chamber, in the reservoir chamber device fluid embedded from the treatment fluid can be adapted to at least partially separated.