Patent ID: 8734373

Claim:
An assembly for preparing platelet rich plasma (PRP) having a reduced white blood cell (WBC) content comprising: a. a test tube for receiving a blood sample or a platelet-comprising fraction thereof and for obtaining therein, by a procedure that includes centrifugation, a platelet rich plasma (PRP) fraction; b. an elongated sliding filter device having a first and second end and a lumen extending there between, and having a filter fitted at the first end, said filter having an effective pore size of about 5-25 μm such to permit passage of platelets and not permit passage of white blood cells (WBC) larger than a defined size into the lumen, the second end having an opening; said first end of the elongated filter device being adapted for tight fitting into said test tube such that when forced into the test tube to exert pressure on the PRP fraction, the PRP fraction with the platelets filters into said lumen and white blood cells of a size larger than said defined size remains in the test tube to thereby obtain a WBC-selective PRP within said lumen.