Medical devices for the treatment of wounds, burns, ulcers, damaged skin and tissue, joint and musculo-skeletal diseases and disorders; medical apparatus for the preparation and injection of Platelet-Rich Plasma (PRP); medical apparatus and instruments for separating human and animal tissues and cells for medical purposes; medical devices for mechanical disaggregation of biological material for preparing cellular suspensions and micro-insert of tissue for medical purposes; Blood processing kits comprised of apparatus for blood collection, separation of blood components, processing of blood and administration of blood for medical purposes being medical needles, medical syringes, sample preparation tubes and vials, holders for sample tubes and vials, blood filters, and centrifuges for medical purposes