A safety needle device (10) comprising: a housing (20) having a proximal end (22) and a distal end (24) with an opening； a retractable cover (50) arranged and movable in the opening and surrounding a needle cannula having a distal end (24) and a proximal end (22) mounted on a needle center (30) at the proximal end (22 ) of the housing (20), the retractable cover (50) having a radially enlarged proximal end (22) and a shoulder (150)； a spring (60) to deflect the retractable cover (50) in a distal direction to cover the distal end (24) of the needle cannula, the spring (60) having a proximal end (22), a main body, and a distal end (24)； and a radial projection (70) extending inwardly from the housing (20) to cause the spring (60) to compress after the application of a force in the proximal direction to allow the spring (60) to move from a proximal position (80) of the spring when the spring (60) is locked under the shoulder (150) to a distal position (90) when the spring (60) has moved from past the shoulder (150), so that when the Spring (60) is extended the distal end (24) of the spring (60) is secured to a hitch (100) at the distal end (24) of the housing (20).Un dispositivo (10) de aguja de seguridad que comprende: un alojamiento (20) que tiene un extremo proximal (22) y un extremo distal (24) con una abertura； una cubierta retráctil (50) dispuesta y desplazable en la abertura y que rodea una cánula de la aguja que tiene un extremo distal (24) y un extremo proximal (22) montados en un centro de agujas (30) en el extremo proximal (22) del alojamiento (20), teniendo la cubierta retráctil (50) un extremo proximal agrandado radialmente (22) y un resalto (150)； un resorte (60) para desviar la cubierta retráctil (50) en una dirección distal para cubrir el extremo distal (24) de la cánula de la aguja, teniendo el resorte (60) un extremo proximal (22), un cuerpo principal, y un extremo distal (24)； y un saliente radial (70) que se extiende hacia adentro desde el alojamien
