Implantable electromagnetic pumps

A micropump implantable in an eye, comprising:

• a ferromagnetic member;
• a power source;
• a motor coil magnetically coupled to the ferromagnetic member and electrically coupled to the power source to receive power from the power source, wherein the motor coil is configured to generate a magnetic field in the ferromagnetic member when power is applied to the motor coil by the power source;
• a housing enclosing the motor coil and the power source and partially enclosing the ferromagnetic member, wherein the housing is hermetically sealed;
• a pump diaphragm;
• a compression chamber at least partially defined by the pump diaphragm and having an inlet and an outlet;
• an armature configured to move in response to the magnetic field in the ferromagnetic member;
• and
• wherein the pump diaphragm is configured to cause fluid to flow through the compression chamber from the inlet to the outlet in response to movement of the armature, and wherein the pump diaphragm, the compression chamber, the armature, and a portion of the ferromagnetic member are located outside of the housing.