Patent ID: 8641900

Claim:
A collection unit for collecting a plurality of microspheres in a solution, the collection unit comprising: a tank having an outlet; and a first plate removably disposed in the tank, the first plate having a lower edge with at least one slot, wherein when the first plate is disposed across the tank, the first plate has its lower edge separated, by the slot, from a bottom surface of the tank by a first distance, the first plate has two ends coupled with the sidewall of the tank so as to divide the tank into a first chamber and a second chamber, wherein the outlet is located in the second chamber, and the slot is separated from the sidewall of the tank by a second distance; wherein after the solution containing the microspheres is input to the tank through the first chamber, the microspheres are deposited around the first plate, and the solution is caused to pass through or over the first plate to the second chamber and output from the outlet.