| 摘要 |
A footswitch for ophthalmic surgery includes a rotatable foot pedal, a spring member which biases the foot pedal to resist rotation and an adjustment mechanism for adjusting the bias of the spring member to a surgeon selected value. In an illustrated embodiment, the adjustment mechanism includes a worm screw gear assembly which is used to vary the amount of torque generated by a coil spring on a shaft upon which a pedal is mounted. As a worm gear is rotated by a thumb wheel, a spur gear is rotated to wind or unwind coil spring thereby increasing or decreasing the amount of tension exerted by coil spring on a shaft.
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