embodiments of the presently - disclosed electrosurgical pencil will now be described in detail with reference to the drawing figures wherein like reference numerals identify similar or identical elements . in the drawings , and in the description which follows , the term “ proximal ”, as is traditional , will refer to the end of the electrosurgical pencil which is closest to the operator , while the term “ distal ” will refer to the end of the electrosurgical pencil which is furthest from the operator . fig1 sets forth a partially broken , side elevational view of an electrosurgical pencil constructed in accordance with one embodiment of the present disclosure and generally referenced by numeral 100 . while the following description will be directed towards electrosurgical pencils it is envisioned that the features and concepts of the present disclosure can be applied to any electrosurgical type instrument . electrosurgical pencil 100 includes an elongated housing 102 configured and adapted to support a blade receptacle 104 at a distal end thereof which , in turn , receives a replaceable electrocautery blade 106 therein . a distal end portion 108 of blade 106 extends distally from receptacle 104 while a proximal end portion 110 of blade 106 is retained within the distal end of housing 102 . preferably , electrocautery blade 106 is fabricated from a conductive type material , i . e ., stainless steel or is coated with an electrically conductive material . as shown , electrosurgical pencil 100 is coupled to a conventional electrosurgical generator “ g ” via a cable 112 . cable 112 includes a transmission wire 114 which electrically interconnects the electrosurgical generator “ g ” with the proximal end portion 110 of blade 106 . cable 112 further includes a control loop 116 which electrically interconnects an activation button 124 , supported on an outer surface 107 of the housing 102 , with the electrosurgical generator “ g ”. by way of example only , electrosurgical generator “ g ” may be any one of the following , or equivalents thereof : the “ force fx ”, “ force 2 ” or “ force 4 ” generators manufactured by valleylab , inc . a division of tyco healthcare , lp , boulder , colo . preferably , the electrosurgical generator “ g ” can be variable in order to provide appropriate first rf signals ( e . g ., 1 to 120 watts ) for tissue cutting and appropriate second rf signals ( e . g ., 1 to 300 watts ) for tissue coagulation . preferably , an exemplary electrosurgical generator “ g ” is disclosed in commonly assigned u . s . pat . no . 6 , 068 , 627 to orszulak , et al ., the entire content of which are hereby incorporated by reference . the electrosurgical generator disclosed in the &# 39 ; 627 patent includes , inter alia , an identifying circuit and a switch therein . in general , the identifying circuit is responsive to information received from a generator and transmits a verification signal back to the generator . meanwhile , the switch is connected to the identifying circuit and is responsive to signaling received from the identifying circuit . turning back to fig1 , as mentioned above , electrosurgical pencil 100 includes activation button 124 which is supported on an outer surface 107 of housing 102 . activation button 124 is operatively connected to a pressure transducer 126 ( or other variable power switch ) which , in turn , controls the rf electrical energy supplied from generator “ g ” to electrosurgical blade 106 . more particularly , pressure transducer 126 electrically couples to control loop 116 and is configured to regulate ( or variably control ) the amount of rf energy transmitted to electrocautery blade 106 and / or to variably control the waveform output from electrosurgical generator “ g ”. in use , pressure transducer 126 converts input energy of one form into output energy of another . for example , pressure transducer 126 initially converts a pressure input from activation button into an output signal which is transmitted to electrosurgical generator “ g ”. in turn , generator “ g ” transmits a corresponding amount of energy ( or an appropriate waveform output ) to electrocautery blade 106 via transmission wire 114 . as such , by selectively applying pressure to switch 124 to apply pressure to pressure transducer 126 , the surgeon can variably control the amount of energy and / or the waveform output of the electrosurgical generator “ g ”. for example , by applying a relatively light pressure against activation button 124 , and , in turn , to pressure transducer 126 , in the direction of arrow “ p ” in fig1 , thus depressing pressure transducer 126 a relatively small amount , a “ cutting - type ” waveform is transmitted . by applying a relatively heavy pressure against activation button 124 , thus depressing pressure transducer 126 a relatively large amount , a “ coagulating - type ” waveform is transmitted . as can be appreciated , an intermediate pressure applied against activation button 124 will produce varying combinations of “ cutting - type ” waveforms and “ coagulating - type ” waveforms . more particularly and in use , when activation button 124 is depressed in direction “ p ”, pressure is applied against transducer 126 which , in turn , converts the input pressure into a corresponding electrical signal . the electrical signal is transmitted , via control loop 116 , to electrosurgical generator “ g ”. electrosurgical generator “ g ”, in turn , processes the electrical signal received from pressure transducer 126 and transmits an output signal ( i . e ., rf energy , waveform , power , voltage , current , duty , cycle , frequency and the like ), via transmission wire 114 , to electrocautery blade 106 . as can be appreciated , the pressure “ p ” applied to activation button 124 against the pressure transducer 126 , directly determines the overall level of output of electrosurgical generator “ g ” and , in turn , the ultimate function of electrocautery blade 106 . since activation button 124 can be depressed to a variety of positions the surgeon is able to create a pallet of varying therapeutic effects ranging from a pure “ cutting ” mode to a pure “ coagulating ” mode and variations therebetween . it is envisioned that the switch 124 may include a plurality of incremental steps ( not shown ) to provide better tactile feedback to the surgeon . it is also contemplated that the incremental steps may include audible feedback to further enhance the surgeon &# 39 ; s tactile feedback . as such , the surgeon need not visually verify the new setting of electrosurgical pencil 100 by continuously checking the display , meters or gauges on electrosurgical generator “ g ”. in particular , the surgeon will be able to make changes to the electrosurgical pencil , as needed , from the operative field . it is contemplated that activation button 124 can included other electromechanical sensors , e . g ., optical sensors , pneumatic sensors , accelerometer , position sensors , etc . to provide sensory feedback to generator “ g ”. as mentioned above , the activation button 124 may also include some measure of tactile feedback which is felt by the surgeon &# 39 ; s finger and / or some measure of audible feedback produced by the activation button 124 ( e . g ., a “ click ”), by the electrosurgical generator “ g ” ( e . g ., a “ tone ”) and / or an auxiliary sound - producing device such as a buzzer ( not shown ). while rf energy and waveforms have been disclosed as being controlled by the position of or pressure applied to pressure transducer 126 , it is envisioned that other electrosurgical parameters can be controlled by pressure transducer 126 , such as , for example , power , voltage , current , duty , cycle and / or frequency . turning now to fig2 - 3 , an alternate electrosurgical pencil 200 is shown and includes a slide - switch 224 which is slidably supported atop a slide bed 228 disposed within the outer surface 107 of housing 102 . preferably , slide - switch 224 is operatively connected to transducer 226 which is , in turn , electrically connected to control loop 116 in a similar manner as described above . in the present embodiment , as slide - switch 224 is displaced , either proximally or distally along activation line “ x ”, transducer 226 converts the degree of displacement of slide - switch 224 into a signal which is transmitted to electrosurgical generator “ g ” via transmission line 116 . generator “ g ”, in turn , transmits a corresponding amount of rf energy ( or an appropriate waveform output ) to electrocautery blade 106 . as such , slide - switch 224 , in combination with transducer 226 , allows the surgeon to variably control the amount of energy and / or the waveform output of electrosurgical generator “ g ”. for example , when slide - switch 224 is in a proximal - most position , as seen in fig2 , a “ cutting - type ” waveform is selected . meanwhile , by displacing slide - switch 224 to a distal - most position , as seen in fig3 , a “ coagulating - type ” waveform is selected . it is envisioned that positioning slide - switch 224 at discrete locations along the length of slide bed 228 will induce a combination of “ cutting - type ” waveforms and “ coagulating - type ” waveforms . accordingly , the surgeon can select the therapeutic effect desired by simply displacing slide - switch 224 to an appropriate position along slide bed 228 . it is envisioned that slide bed 228 may be configured such that slide - switch 224 “ clicks ” into discrete positions along slide bed 228 from the proximal - most position to the distal - most position . the “ clicking ” provides the surgeon with both tactile and audible feedback as to the location of slide - switch 224 . it is further envisioned that electrosurgical pencil 200 may be activated and deactivated ( i . e ., energized or de - energized ) by depressing and then releasing sliding button 224 . turning now to fig4 , an alternate embodiment of an electrosurgical pencil 300 is shown and includes at least one activation button 324 supported on the outer surface 107 of housing 102 . it is envisioned that two activation button 324 , 325 may also be employed . in accordance with this embodiment , electrosurgical pencil 300 preferably includes a pendent 350 which is configured and adapted to be removably attached to or stuck to the surgeons wrist or coat sleeve “ c ” ( as seen in fig4 ), the patients drapes or robe , or a mayo stand . it is envisioned that the pendent 350 may also be removably attached by any known means such as clips , velcro ™, band , belt , elastic , or the like . as seen in fig4 , pendent 350 is electrically connected to electrosurgical pencil 300 via a connecting wire 352 . optionally , pendent 350 can be electrically connected to electrosurgical generator “ g ” via a connecting wire 354 ( shown in phantom in fig4 ). pendent 350 preferably includes at least some of , if not all of , the variable controls 356 of electrosurgical pencil 300 . variable controls 356 permit the surgeon to select the function desired ( i . e ., cutting or coagulating ) and to vary the power being supplied by electrosurgical generator “ g ” to electrosurgical pencil 300 . variable controls 356 , include , but are not limited to knobs , buttons , switches , dials , slides , touch screens , etc . in use , the surgeon can select the function and level of power from pendent 350 instead of electrosurgical generator “ g ”. the surgeon then uses or activates and deactivates electrosurgical pencil 300 in a conventional manner by depressing and releasing activation button 324 or 325 . accordingly , during use of electrosurgical pencil 300 , if the surgeon desires to vary or adjust the output or function of electrosurgical pencil 300 , the surgeon simply needs to adjust variable controls 356 of pendent 350 . as such , the surgeon does not need to adjust the controls of the electrosurgical generator “ g ” or take his / her focus and / or attention away from the patient and the surgical procedure being performed . in addition , in combination or alternatively , a status monitor may also be employed to provide visual and audible indications corresponding to the operational status of the generator “ g ”. for example , one such status monitor is described in commonly owned u . s . pat . no . 6 , 402 , 741 entitled “ current and status monitor ”, the entire contents of which are hereby incorporated by reference herein . while embodiments of electrosurgical instruments according to the present disclosure have been described herein it is not intended that the disclosure be limited there and the above description should be construed as merely exemplifications of preferred embodiments . those skilled in the art will envision other modifications within the scope and spirit of the present disclosure .
the present disclosure is directed to electrosurgical pencils having variable controls . in one aspect , the electrosurgical pencil , includes an elongated housing , an electrocautery blade supported within the housing and extending distally from the housing , the electrocautery blade being connected to a source of electrosurgical energy , an activation button supported on the housing , the activation button being movable from a first position to at least a subsequent position , and a transducer electrically connected between the activation button and the source of electrosurgical energy . the transducer is configured to transmit an electrical output signal to the electrosurgical energy source correlating to the movement of the activation button . the source of electrosurgical energy correspondingly supplies an amount of electrosurgical energy to the electrocautery blade dependant upon the electrical output signal .