Medical Needle Safety Device

摘要

A medical needle safety device includes a needle mount for supporting the needle and a needle shielding sleeve surrounding a supported needle coaxially with the mount, for sliding from a needle shielding position towards a non-shielding position. The mount (30) provides a sliding surface and a resiliently flexible finger is provided on the sleeve, the finger being resiliently deformed outwardly as the sleeve moves towards a non-shielding position, to urge the sleeve back to a shielding position. A control member is disposed within the sleeve and the inner surface of the finger has a camming surface with a transition profile between the inner surface and canning surface. On initial rearward movement of the sleeve, the control member interacts with the camming surface of the finger to flex the finger outwardly and store energy therein. Further rearward movement of the sleeve transfers the inner surface of the finger on to the sliding surface of the mount whereby the stored energy in the finger urges the sleeve forwardly to the shielding position.

主权项

1. A safety device for shielding a medical needle having a sharp tip, which device comprises:
a needle mount for directly or indirectly supporting the medical needle; a needle shielding sleeve for surrounding the supported needle and arranged coaxially with the mount for sliding rearward movement relative to the mount from a needle shielding position towards a non-shielding position whereat at least the tip of the needle is exposed beyond the sleeve; a sliding surface provided on one of the sleeve and mount; at least one elongate resiliently flexible finger provided on the other of the sleeve and mount and serving as a spring to return the sleeve to a needle shielding position, the finger having an inner surface provided with a camming surface; and a control member having an outer surface and arranged coaxially with the sleeve and mount, the control member having a set position with respect to the finger and being slidably displaceable from said set position when the sleeve slides towards the non-shielding position; characterised in that the inner surface of the finger is provided with an elongate camming surface and there being a transition profile between the camming surface and the inner surface; such that: rearward movement of the sleeve to a non-shielding position displaces the control member from its set position so that the outer surface of the control member interacts with the camming surface of the finger, thereby flexing the finger to generate and store energy therein for returning the sleeve to a needle shielding position; and thereafter further rearward movement of the sleeve further displaces the control member so that the outer surface of the control member interacts with the transition profile of the finger, whereby the inner surface of the finger is transferred on to the sliding surface, the stored energy in the finger then acting on the sliding surface thereby to exert a spring force for returning the sleeve to a needle shielding position.