Accumulator for implantable infusion device

A fluid delivery pump for an implantable infusion device (IID), the fluid delivery pump comprising:

• an inlet configured to be fluidically connected to a source of a therapeutic agent;
• an outlet configured to be fluidically connected to a catheter;
• a pumping mechanism configured to receive the therapeutic agent from the source through the inlet and deliver the therapeutic agent through a flow path from the outlet into and through the catheter;
• and
• an accumulator arranged at the outlet, the accumulator comprising:
• a cover;
• and
• a diaphragm biased away from the cover and configured to deflect toward the cover under pressure generated by the therapeutic agent in the flow path of the IID,
• wherein the cover is configured to withstand the pressure generated by the therapeutic agent in the flow path without appreciably deforming.

A system comprising:

• an implantable infusion device (IID);
• and
• a catheter connected to the IID,
• wherein the IID comprises:
• a reservoir configured to store a therapeutic agent;
• a fluid delivery pump configured to receive the therapeutic agent from the reservoir and deliver the therapeutic agent through a flow path from an outlet of the fluid delivery pump into and through the catheter;
• and
• an accumulator arranged at the outlet of the fluid delivery pump, the accumulator comprising:
• a cover;
• and
• a diaphragm biased away from the cover and configured to deflect toward the cover under pressure generated by the therapeutic agent in the flow path of the IID,
• wherein the cover is configured to withstand the pressure generated by the therapeutic agent in the flow path without appreciably deforming.