Method and apparatus for preparing platelet rich plasma and concentrates thereof
View Patent ↗The PRP separator-concentrator of this invention is suitable for office use or emergency use for trauma victims. The PRP separator comprises a motorized centrifugal separation assembly, and a concentrator assembly. The centrifugal separator assembly comprises a centrifugal drum separator that includes an erythrocyte capture module and a motor having a drive axis connected to the centrifugal drum separator. The concentrator assembly comprises a water-removal module for preparing PRP concentrate. The centrifugal drum separator has an erythrocyte trap. The water removal module can be a syringe device with water absorbing beads or it can be a pump-hollow fiber cartridge assembly. The hollow fibers are membranes with pores that allow the flow of water through the fiber membrane while excluding flow of clotting factors useful for sealing and adhering tissue and growth factors helpful for healing while avoiding activation of platelets and disruption of any trace erythrocytes present in the PRP.
1. A portable, enclosed, disposable self-contained, single-use PRP separator-concentrator suitable for office use or emergency use for trauma victims, the PRP separator comprising a centrifugal separator unit and a motor, the separator-concentrator having the ability to separate and concentrate PRP with a total power consumption of less than 500 mAh;
a) the centrifugal separator unit comprising a centrifugal drum having an inner wall surface with an upper edge and a lower edge, a drum bottom, and a central axis, the drum bottom having a depression and a floor sloping downward from the lower edge to a depression, incoming flow tube extending into the centrifugal drum and an outgoing flow tube extending into the centrifugal drum, the outgoing flow tube having an inlet positioned adjacent the depression;
b) a drive motor having a drive axis connected to the centrifugal separator unit;
c) a hollow fiber cartridge having a cartridge inlet, a cartridge outlet, and membrane fibers, the membrane fibers having pores that allow the passage of water and salts while blocking passage of clotting and healing factors present in blood, the cartridge inlet connected to the outgoing tube through a flow passageway; and
d) a pump having an inlet port and an outlet port, the inlet port connected to the cartridge outlet through a flow passageway and the outlet port connected to the incoming flow tube through a flow passageway.
2. The separator-concentrator of claim 1 wherein the hollow fiber cartridge includes hollow fibers, an extracted liquid chamber surrounding the hollow fibers and an extracted liquid overflow chamber communicating with the extracted liquid chamber.
3. The separator-concentrator of claim 2 wherein the extracted liquid overflow chamber has an upper wall and a vent in the upper wall, the vent being blocked by a lower hydrophilic membrane and an upper hydrophobic membrane, whereby air is vented through the vent when the overflow chamber fills, liquid saturates the hydrophilic membrane and the hydrophobic membrane blocks liquid flow when the overflow chamber is filled, and the saturated hydrophilic membrane prevents air flow into the overflow chamber if internal pressure in the system draws liquid from the overflow chamber.