Device for use in delivery of ophthalmic lenses

摘要

The actuator (see FIG. 2) comprises a barrel 16 and a plunger 22 received within the barrel. A clutch mechanism 54 is operable between the plunger and the barrel. In the engaged condition of the clutch, the plunger is advanced by rotation relative to the barrel. An axial load on the plunger disengages the clutch mechanism, allowing the plunger to be advanced axially while rotating the driven member 60. Two-handed or one-handed operation is therefore possible. A freely rotatable collar 27 on the plunger allows the plunger to be returned to its retracted position with a linear rearward movement while allowing rotation of the plunger. A resilient ring 35 mounted in a cross-passage 32 in a bush 28 at the forward end of the plunger provides a measured degree of frictional resistance to the plunger returning under its own weight to the retracted position. The ring may be replaced by a C-shaped resilient element (see FIG. 13). The actuator can be used in combination with a lens delivery device (see FIGS. 1 and 2).

主权项

1. A device for use in delivery of ophthalmic lenses, the device comprising a barrel, a plunger receivable in the barrel and moveable between a first, withdrawn position and a second, more advanced position, the plunger having a portion which contacts the interior of the barrel and comprises a resilient member which is carried by the plunger and lies in a plane transverse to the direction of relative movement of the plunger and the barrel, one or more outer surface portions of the resilient member together extending over less than all of the periphery of the plunger and providing the said contact with the barrel, and the resilient member having a shape that is resiliently deformable in plan between a relaxed condition and a deformed condition, and carried by said plunger to provide said contact with the barrel when in said deformed condition.