Medical needle safety device

摘要

A passive safety device for a medical needle has a mount for supporting the needle and a needle shielding sleeve co-axial with and arranged for sliding movement relative to the mount, from a shielding position to a non-shielding position. An abutment surface is provided on one of the sleeve and mount and is engageable by a radially deformable finger, when undeformed. A control member is also slidably arranged with respect to the mount and sleeve and has an initial set position. The control member co operates with the finger so that on sliding movement of the sleeve from its initial shielding position, the finger is moved radially outwardly, clear of the abutment surface and on to a sliding surface. Continued movement of the sleeve increases deformation of the finger and generates a restorative force between the finger and the sliding surface to move the sleeve back to a needle shielding position following the performance of a procedure and return the finger into radial alignment with the abutment surface, the control member remaining displaced from its set 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 a medical needle; a needle shielding sleeve for surrounding a supported needle and arranged coaxially with the mount so that a force applied to the sleeve slides the sleeve 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; an abutment surface and a sliding surface provided on either one of said needle shielding sleeve or said needle mount; a radially deformable resilient finger provided on the other of said needle shelding sleeve and said needle mount, and having a part in radial alignment with the abutment surface when the finger is undeformed to block movement of the sleeve from said needle shielding position; and a control member having an outer surface and arranged coaxially with the needle shielding sleeve and the needle mount and slidably displaceable from a set position with respect thereto the arrangement of the control member being such that initial movement of the sleeve towards a non-shielding position slidably displaces the control member from said set position and causes relative movement between the finger and the control member, the inner surface of the finger riding up the outer surface of the control member to radially deform the finger and move said part thereof out of radial alignment with the abutment surface thereby to allow the sleeve to move to a non-shielding position and bring the inner surface of the finger into contact with the sliding surface, and continued movement of the sleeve slides the inner surface of the finger along the sliding, surface to increase the radial deformation of the finger and store energy therein for returning the sleeve to a needle shielding position whereat the finger is undeformed and said part is in radial alignment with the abutment surface, thereby to block movement of the sleeve towards a non-shielding positiom. consequent upon the displacement of the control member from the set position.