Abstract: A safety device of butterfly needle includes a sliding groove seat and a sliding groove cover. By assembling the sliding groove seat with the sliding groove cover, a case having sliding tracks at two sides thereof is formed. A butterfly needle having two wings can be accommodated in the case, and the two wings can be extended out from the sliding tracks at the two sides of the case. Thus, a user is still allowed to easily manipulate the butterfly needle by handholding the wings, and a needle head of the butterfly needle is freely extended and retracted within the case, such that the needle head is not randomly extended out of the case, thereby maintaining usage safety of the butterfly needle.

Abstract: The present invention relates to a safety device of a syringe needle having a needle, a needle seat, and a needle lid. On the needle seat, a circular groove formed in the front and a breakable circular groove formed in the rear. At the end of the needle lid, a semicircle ring is attached. After injection, push the needle lid forward and insert the semicircular ring into the circular groove to secure the needle lid and then break the needle seat from the breakable circular groove, thereby preventing the needle from being re-used and enhancing the medical treatment safety.