A needle guard (15; 115; 215; 415) comprising a plurality of front panels (18; 118; 218) placed circumferentially around an axis, a plurality of rear panels (22; 122; 222; 422) placed circumferentially around the axis in a first position substantially collinear with the plurality of front panels, in which the plurality of rear panels is movably coupled to the plurality of front panels, and a spring (34; 138; 238; 438), characterized in that the needle guard further comprises a body (30; 130; 230) positioned close to the plurality of rear panels coaxially with the plurality of front and rear panels and configured to hold the spring (34; 138 ; 238; 438) in a compressed state, in which the plurality of front and rear panels can be folded to a second position, in which the movement of the plurality of the rear panels triggers the release of the spring, in which The spring is deflected to deploy the plurality of front and rear panels and return the plurality of front and rear panels to the first position.Un protector de aguja (15; 115; 215; 415) que comprende una pluralidad de paneles frontales (18; 118; 218) colocados de forma circunferencial alrededor de un eje, una pluralidad de paneles traseros (22; 122; 222; 422) colocados de forma circunferencial alrededor del eje en una primera posición sustancialmente colineal con la pluralidad de paneles frontales, en el que la pluralidad de paneles traseros se acopla de forma móvil a la pluralidad de paneles frontales, y un resorte (34; 138; 238; 438), caracterizado por que el protector de aguja comprende además un cuerpo (30; 130; 230) colocado próximo a la pluralidad de paneles traseros de forma coaxial con la pluralidad de paneles frontales y traseros y configurado para mantener el resorte (34; 138; 238; 438) en un estado comprimido, en el que la pluralidad de paneles frontales y traseros pueden plegarse a una segunda posición, en el que el movimiento de la pluralidad de los paneles traseros acciona la liberación del resorte