The Extraction Device for Collecting Blood Samples, including a Catheter and a Safety System in which a flexible catheter instead of a metallic cannula with sharp edges for extracting blood is presented. This catheter is inserted through a traditional cannula, which retracts once the catheter is inside the vein, by means of a spring and safety latch mechanism, retaining the cannula within a rigid housing. The retracted cannula remains immobile within the rigid housing thus avoiding reutilization of the devise and accidental puncture wounds during its disposal. This EDCBSCSS has the advantages of (a) reducing or eliminating the use of a metallic cannula with sharp edges, which remains inside the vein during the entire procedure (b) using a plastic cannula or catheter for extracting the blood sample which provides greater comfort for the patient and the assurance that the cutting element has been disabled (c) possessing a safety system for medical personal so that after the procedure no accidental puncture wounds occur and (d) being easy to handle. The EDCBSCSS is made up of three sequential operational systems, which are the puncturing and retracting system which are located within housings (4) and (5) and are comprised of: (1) a puncturing cannula (2) a catheter (3) a catheter space, (9) a spring and (8) a safety latch.
