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A single-use system for separating blood and producing platelet concentrates includes an elongated container for receiving blood from a patient. The container has a movable plunger mounted within the blood container for expressing blood fractions separated during centrifugation of the container thro

A single-use system for separating blood and producing platelet concentrates includes an elongated container for receiving blood from a patient. The container has a movable plunger mounted within the blood container for expressing blood fractions separated during centrifugation of the container through a first port mounted at one end of said container, a second port mounted on the plunger, and a third port mounted on a plunger rod attached to the plunger.

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A single-use system for separating blood and producing platelet concentrates includes an elongated container for receiving blood from a patient. The container has a movable plunger mounted within the blood container for expressing blood fractions separated during centrifugation of the container thro

A single-use system for separating blood and producing platelet concentrates includes an elongated container for receiving blood from a patient. The container has a movable plunger mounted within the blood container for expressing blood fractions separated during centrifugation of the container through a first port mounted at one end of said container, a second port mounted on the plunger, and a third port mounted on a plunger rod attached to the plunger. ically conductive wire operably connecting the proximal end of the tensioning cable to the actuator housing, and wherein the electrically conductive wire is connected to a power source and a switch. 2. The instrument holder of claim 1, wherein the distal end of the arm is adapted to accept a tool or instrument. 3. The instrument holder of claim 1, wherein the arm is attached to a support device. 4. The instrument holder of claim 1, wherein the joint comprises a ball and socket joint or an elongated hinge. 5. The instrument holder of claim 1, wherein the joint comprises unpolished contacting surfaces. 6. The instrument holder of claim 1, wherein the tensioning device is connected to a switch and to a power source selected from a fixed electricity supply, a battery, a rechargeable battery and a photovoltaic cell. 7. The instrument holder of claim 1, wherein the arm comprises a plurality of links longitudinally arranged along a common axis, wherein adjacent links are pivotally connected by a hinged joint, and each link has a duct longitudinally arranged with a common axis. 8. The instrument holder of claim 7, wherein the hinged joints linking adjacent links are ball and socket joints, elongated hinges or a combination thereof. 9. The instrument holder of claim 7, wherein the hinged joints included unpolished contacting surfaces. 10. The instrument holder of claim 7, wherein each link of the plurality of links further comprises: a distal end having a concave cavity; and a proximal end having a convex surface, wherein the convex surface of each link is received by the concave cavity of an adjacent link, thereby forming a hinged joint. 11. The instrument holder of claim 7, wherein each link of the plurality of links further comprises: a distal end having a convex surface; and a proximal end having a concave cavity, the concave cavity of each link receiving the convex surface of an adjacent link, thereby forming a hinged joint. 12. The instrument holder of claim 1, further comprising a frame slideably disposed in the interior cavity of the actuator housing and connected to the proximal end of the tensioning cable and the electrically conductive wire. 13. The instrument holder of 12, wherein the frame further comprises a first rod having the electrically conductive wire disposed thereon and a second rod, and wherein the wire has a first end and a second end attached to the actuator housing. 14. The instrument holder of claim 13, further comprising a second rod attached to the actuator housing, wherein the electrically conductive wire is looped around the first and second rods, and wherein the wire has a first end and a second end attached to the actuator housing. 15. The instrument holder of claim 1, further comprising a movement limiting device. 16. The instrument holder of claim 1, wherein the electrically conductive wire contracts when connected to an electric power source. 17. The instrument holder of claim 1, wherein the electrically conductive wire comprises a shape memory alloy. 18. The instrument holder of claim 17, further comprising a tensioning mechanism for applying a tension force to the electrically conductive wire. 19. The instrument holder of claim 17, wherein the electrically conductive wire comprises a tungsten-nickel alloy. 20. The instrument holder of claim 1, wherein the electric power source comprises a battery, a rechargeable battery, a fixed electrical supply or a photovoltaic cell. 21. The instrument holder of claim 1, wherein the electric switch is selected from the group consisting of a reversible polarity switch, a hand-operable switch, a foot-operable switch, a voice-activated switch, an electronically regulated switch and a computer-regulated switch. 22. The instrument holder of claim 1, further comprising a surgical device connected to the distal end of the arm. 23. The instrument holder of claim 22, wherein the surgical device comprises a brain retractor. 24. The instrument holder of clai