Implantable drug delivery device with peristaltic pump having a bobbin roller assembly

An implantable drug infusion device comprising, in combination:

• a bulkhead having a race;
• a pump tube having an inlet and an outlet and being positioned within the race;
• a roller assembly configured to compress the tube against the race at one or more points along the path, the roller assembly including at least one roller, the roller assembly comprising at least two biasing members operably connected to the roller to adjustably bias the roller against the tube, the two biasing members forming an angle;
• and
• a drive assembly to drive the roller assembly relative to the tube along the path so as to move a liquid through the tube.

An implantable drug infusion device comprising, in combination:

• a bulkhead having a race, a first chamber, and a second chamber;
• a pump tube having an inlet and an outlet and being positioned within the race;
• a motor assembly positioned within the first chamber;
• and
• a pumphead assembly positioned within the second chamber, the motor assembly driving the pumphead assembly, the pumphead assembly comprising
• a roller assembly having a hub, three roller housings, each roller housing having a roller and being pivotally connected to the hub;
• a drive assembly to drive the roller assembly relative to the tube along the path so the rollers compress the tube to move a liquid through the tube;
• the rollers and race defining a gap;
• and
• at least two springs operably connected to each roller housing to bias a corresponding roller against the tube, the two springs forming an angle.