Rotary pump driven medicament delivery device

A medicament delivery device comprising:

• a pump and a motor, the pump having an inlet connected to a reservoir of medicament and an outlet connected to a discharge device, the pump comprising:
• a rotor housing having a peripheral wall, an inlet port, and a discharge port, wherein the peripheral wall defines a pump chamber with a trochoidal wall;
• and
• a rotor movably positioned within the rotor housing, the rotor comprising three lobes and three respective apexes, wherein:
• a center point of the inlet port is offset from a center point of the discharge port by a distance such that the rotor cannot open both the inlet port and discharge port at the same time,
• each of the three apexes is disposed between adjacent lobes of the three lobes such that the adjacent lobes of the three lobes share a common apex,
• each of the three lobes extends between two of the three apexes,
• each of the three lobes comprises two distinct arcs, a first portion of each arc adjacent to one of the three apexes defining a non-smooth curve having a curvature that varies along a length thereof,
• the curvature of the non-smooth curve is adapted to create a seal between an outer surface of the rotor and the peripheral wall of the rotor housing, and
• the curvature of the non-smooth curve comprises two arcuate portions with different radii of curvature, such that an unwanted transfer of fluid is prevented;
• wherein the rotor is fabricated of a flexible material so that the three apexes do not require separate sealing members;
• wherein the motor is connected to the pump during medicament delivery, wherein medicament is drawn from the reservoir into the pump chamber in the rotor housing through the inlet as the rotor turns relative to the rotor housing and the medicament is expelled through the outlet and into the discharge device.