Dispensing systems and methods for prefilled syringes
A dispensing mechanism includes at least two helical augers having threads, and at least two channels configured to hold the items to be dispensed. The items to be dispensed are received at least partially within the threads of the augers. The dispensing mechanism includes a drive mechanism engaged with the at least two augers and configured to rotate the at least two augers to transport the items to be dispensed, driven by the threads of the augers, to dispense the items from the dispensing mechanism. The dispensing mechanism may include a separable dispenser and cassette.
1. A dispensing mechanism for dispensing elongate items, the dispensing mechanism comprising:
a dispenser, the dispenser including a motor, and a connector for receiving electrical power and control signals from a cabinet in which the dispensing mechanism is installed, the dispenser including an opening at a bottom of the dispenser through which the dispensing mechanism is configured to dispense the items; and
a cassette,
wherein the dispenser and the cassette are mateable such that the motor drives a drive mechanism, and wherein the dispenser and cassette are separable,
wherein the cassette includes:
a plurality of helical augers having threads;
a plurality of channels configured to hold the items to be dispensed with longitudinal axes of the items to be dispensed being generally perpendicular to rotational axes of the plurality of augers, and the items to be dispensed being received at least partially within the threads of the plurality of augers; and
the drive mechanism engaged with the plurality of augers and configured to rotate the plurality of augers to transport the items to be dispensed, driven by the threads of the plurality of augers, to dispense the items from the dispensing mechanism.
2. The dispensing mechanism of claim 1 , wherein the dispensing mechanism is removably electrically and mechanically coupleable to the cabinet.
3. The dispensing mechanism of claim 1 , wherein the plurality of augers are disposed with their rotation axes vertical, and the items to be dispensed are held generally horizontally within the threads of the plurality of augers, and wherein the dispenser further comprises:
a light emitter directed across the opening at the bottom of the dispenser; and
one or more receivers that detect light from the light emitter, the light emitter and the one or more receivers positioned such that the light emitted the light emitter is interrupted by the passage of a dispensed item through the opening.
4. The dispensing mechanism of claim 3 , wherein the one or more receivers detect light reflected from a far wall of the opening or from an item being dispensed.
5. The dispensing mechanism of claim 3 , wherein the one or more receivers detect light received directly from the light emitter.
6. The dispensing mechanism of claim 1 , wherein the cassette does not include any active electrical components.
7. The dispensing mechanism of claim 6 , wherein
the cassette includes a wirelessly-readable passive memory chip; and
the dispenser includes an antenna for reading the passive memory chip.
8. The dispensing mechanism of claim 1 , wherein the cassette further comprises a brake that is automatically engaged when the cassette is removed from the dispenser, the brake hindering movement of the plurality of augers when the brake is engaged.
9. The dispensing mechanism of claim 1 , wherein the cassette further comprises an encoder gear that indicates a rotational position of a component of the drive mechanism.
10. The dispensing mechanism of claim 9 wherein the cassette further comprises a spring loaded plunger positioned to sequentially fall into and be driven out of pockets in the encoder gear.