| 摘要 |
A speculum (23) comprises a first blade (4), within which are optionally mounted a pair of side blades, associated with a forward operating lever (6), and a second blade (3) associated with a rearward operating lever (7) that is connected by a pivot (2) to the forward operating lever. The pivot is a floating pivot permitting relative translational movement between the operating levers. The operating levers are also connected by a ramp (10), and a ramp follower (30), the ramp being opposed to the pivot so that the pivotally connected operating levers, and the ramp define a triangle. During relative pivotal movement of the operating levers towards one another, the ramp follower moves up the ramp towards the pivot, and this movement of the ramp follower up the ramp causes translational movement at the floating pivot that widens the proximal aperture between the blades. In addition, the side blades can be employed selectively to improve visual, and physical access to the cavity in which the speculum is used. |
