MedPro Safety Products, Inc. of Lexington, KY has developed a blood sample collection syringe that features an automatic capping system to prevent needle injuries. As the syringe is pulled back from the patient’s skin, a cap slides over the needle to protect it. 
The device received FDA clearance in June of last year and the company plans to soon begin marketing the Vacuette system.
From the Lexington Herald-Leader:
The Premium Safety Needle comes in two forms: skin-activated and tube-activated. The skin-activated safety system deploys as the needle is inserted into the vein. The tube-activated system works, as its name suggests, when the blood collection tube is inserted but before the blood is drawn. Inserting the collection tube releases a safety cover that rests against the patient’s skin. As the needle is withdrawn from the arm, the spring extends fully and the plastic sheath completely covers the sharp. The sheath then locks into place so the needle can’t be re-exposed without breaking the device.
More from the Lexington Herald-Leader…
Product page: Vacuette Premium Safety Needle System…