Abstract: Method, system and device for blood vessel penetration prevention or blood vessel penetration detection for safe injection of liquids or gels underneath the human skin surface is disclosed, either for wrinkle treatment or for other purposes. Said method, system and device allow detection of needle contact with a blood vessel, detection of blood vessel penetration and detection of needle condition during its insertion into the patient's skin prior to injecting liquid or gel. Said method, system and device allow prevention of blood vessel penetration by a needle, allow prevention of injection into a blood vessel and allow detection of defective needle. Said device includes force sensor that measures said needle's insertion force required to overcome patient's tissues resistance to needle penetration, a controller, which performs force measurement analysis and positioning element, which stabilizes said needle in relation to the patient's skin without pressing the skin layers in the injection site.

Abstract: A device for successively injecting material at predetermined distances between successive injections to body tissue along a desired path of skin surface includes an injector sub-assembly having a needle configured for injecting the material into body tissue, and a displacement sub-assembly configured to facilitate precise displacement of the needle or of the device along the path between successive injections.

Abstract: A device for successively injecting material at predetermined distances between successive injections to body tissue along a desired path of skin surface includes an injector sub-assembly having a needle configured for injecting the material into body tissue, and a displacement sub-assembly configured to facilitate precise displacement of the needle or of the device along the path between successive injections.