Abstract: A foot pedal assembly for remotely controlling an instrument is disclosed. The foot pedal assembly comprises a base member upon which a foot pedal is mounted. The foot pedal assembly also comprises a means for providing an optical transmitted signal for use in controlling the instrument in response to the movement of the foot pedal. The means for providing an optically transmitted signal comprises a plurality of individual light channels.

Abstract: An improved vitrectomy probe for removing vitreous and cutting mechanism therefore. A hollow elliptically flared cutting blade is reciprocated within a smooth-bore hollow needle of a microsurgical vitrectomy probe across a cutting edge of the outer needle slicing the fibrous material of the vitreous. The cutting blade is configured to provide a more even contact of the cutting surfaces as the cutting blade is reciprocated across the cutting edge of the probe needle. A pressurized fluid source, diaphragm and spring cooperate to provide for the reciprocation of the blade.