Cell concentration devices and methods including a syringe and a syringe holder

1. A method of separating components of different densities from a fluid containing cells using a centrifuge, the method comprising:

receiving a fluid containing cells in a syringe of a separation system, the separation system comprising the syringe and a syringe holder, the syringe having a proximal top with a luer port, a sidewall extending from the top forming a syringe tube, and a plunger slidably disposed inside the syringe tube, the plunger forming a sealing engagement with the sidewall of the syringe tube, the sidewall being substantially straight from the top to a distal end of the syringe tube, wherein the distal end of the syringe tube includes an opening that is at least partially closed by the syringe holder, the syringe holder not connected to the plunger inside the syringe tube, the syringe holder at least partially covering the opening;

placing the syringe and syringe holder into a centrifuge, the fluid containing cells received in the syringe;

exposing the syringe and syringe holder to elevated g force in the centrifuge, the elevated g force urging the plunger toward the syringe holder, wherein the syringe holder is in physical contact with the syringe tube on the distal end and includes a surface arranged to contact the plunger at a bottom perimeter of the plunger during centrifugation, to provide support and maintain the sealing engagement of the plunger with the sidewall of the syringe tube, to prevent fluid from leaking outside the syringe;

removing the syringe from the centrifuge; and

extracting one or more separated layers containing cells using the luer port of the syringe as an access port.

2. The method of claim 1 , wherein receiving the fluid containing cells in the syringe includes loading the syringe with the fluid containing cells through the luer port.

3. The method of claim 2 , wherein the plunger is a first plunger, and further comprising moving the first plunger with a second plunger disposed in the syringe below the first plunger to load the fluid containing cells into the syringe.

4. The method of claim 3 , wherein the syringe holder defines a cavity for receiving the syringe, and further comprising removing the second plunger or a handle of the second plunger prior to receiving the syringe in the syringe holder.

5. The method of claim 1 , wherein the syringe holder defines a cavity for receiving the syringe, and wherein the syringe holder includes an O-ring at a bottom of the syringe holder to prevent fluid from leaking from the syringe into the syringe holder.

6. The method of claim 1 , wherein the syringe includes an insert slidably disposed in the syringe tube between the plunger and the top, the insert, upon centrifugation, allowing fluid components of a density lower than a certain density to rise above the insert and fluid components of a density higher than the certain density to sink below the insert.

7. The method of claim 1 , further comprising:

coupling a manifold to the luer port, the manifold including a manifold port and a vent to vent the syringe;

extending a cannula through the luer port into the syringe, the cannula receivable in the manifold port; and

withdrawing a selected component of the fluid with the cannula.