the preferred embodiments of the present invention and their advantages are best understood by referring to fig1 through 3 of the drawings , like numerals being used for like and corresponding parts of the various drawings . fig1 shows a microsurgical system 10 according to a preferred embodiment of the present invention . as shown in fig1 , microsurgical system 10 is an ophthalmic microsurgical system . however , microsurgical system 10 may be any microsurgical system , including a system for performing otic , nasal , throat , or other surgeries . system 10 has computer 11 disposed therein . system 10 is capable of providing ultrasound power , pneumatic drive pressure , irrigation fluid , and aspiration vacuum to microsurgical instrument 12 . instrument 12 may be any microsurgical instrument necessary for performing otic , nasal , throat , or other surgeries , but is most preferably an instrument to be used in either anterior or posterior segment ophthalmic microsurgery , such as a laser , diathermy probe , a phacoemulsifier , vitreous cutter , powered scissors , powered forceps , or powered fluid injector . surgical instrument 12 is operatively coupled to system 10 via interface 14 . a foot controller 26 is operatively connected to surgical system 10 via interface 28 . interfaces 14 and 28 may be conventional electronic cable or standard surgical tubing as dictated by the requirements of instrument 12 . fig2 and 3 show a preferred embodiment of foot controller 26 . foot controller 26 has a body 48 with a base 49 that supports foot controller 26 on the operating room floor . body 48 preferably includes a pressure plate 52 , heel rest 54 , and a handle 64 . force sensor 50 is disposed within the body and mechanically coupled to pressure plate 52 . pressure plate 52 may be made of any appropriate material but is most preferably made of a lightweight inexpensive material , such as aluminum . force sensor 50 may be any appropriate device , but is most preferably a strain gauge or a force sensing resistor such as the flexiforce ® force sensing resistor available from interlink electronics or tekscan , inc . of boston , mass . force sensor 50 is electrically coupled to interface 28 . interface 28 is , in turn , electrically coupled to system 10 . as shown in fig3 , shield 60 may be coupled to body 48 to partially enclose pressure plate 52 . shield 60 serves to protect foot controller 26 from accidental actuation . during operation , the surgeon proportionally controls a surgical parameter related to the operation of a surgical handpiece by applying pressure to pressure plate 52 . such pressure slightly deforms force sensor 50 causing an electric signal to be generated that is proportional to the applied pressure . this electric signal is transmitted to surgical system 10 via interface 28 . computer 11 of system 10 then proportionally controls a surgical parameter of instrument 12 as a function of the amount of force applied to pressure plate 52 . such proportional control may be in either a linear or non - linear fashion . it is believed that the operation and construction of the present invention will be apparent from the foregoing description . while the apparatus and methods shown or described above have been characterized as being preferred , various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the following claims .
a microsurgical system , and a foot controller for the improved operation of a microsurgical system , are disclosed . a surgeon may use the foot controller to proportionally control a surgical parameter based upon the amount of force applied to a pressure plate of the foot controller .