Anti-needle stick safety device that incorporates a locking system with a 45º twist, providing security and preventing instability of the syringe during use. Allows for passive or active aspiration. Rechargeable system. Advantages: * Patented locking system: Secure locking of the needle protection system. Provides safety and ease of use. * Passive aspiration system: Safety for the patient. * Transparent anesthesia barrel: Clear visibility for aspiration. * Sliding protective sheath: Needle stick protection. * First reversible retention position: Protection during treatment when performing multiple injections. * Irreversible final locking position: Definitive lock to prevent needle sticks.