1. Technical Field
The present disclosure relates generally to electrosurgical instruments and, more particularly, to an electrosurgical pencil having a plurality of hand-accessible variable controls.
2. Background of Related Art
Electrosurgical instruments have become widely used by surgeons in recent years. Accordingly, a need has developed for equipment and instruments which are easy to handle, are reliable and are safe in an operating environment. By and large, most electrosurgical instruments are hand-held instruments, e.g., an electrosurgical pencil, which transfer radio-frequency (RF) electrical or electrosurgical energy to a tissue site. The electrosurgical energy is returned to the electrosurgical source via a return electrode pad positioned under a patient (i.e., a monopolar system configuration) or a smaller return electrode positionable in bodily contact with or immediately adjacent to the surgical site (i.e., a bipolar system configuration). The waveforms produced by the RF source yield a predetermined electrosurgical effect known generally as electrosurgical cutting and fulguration.
As used herein the term “electrosurgical pencil” is intended to include instruments which have a handpiece which is attached to an active electrode and which is used to cauterize, coagulate and/or out tissue. Typically, the electrosurgical pencil may be operated by a handswitch or a foot switch. The active electrode is an electrically conducting element which is usually elongated and may be in the form of a thin flat blade with a pointed or rounded distal end. Alternatively, the active electrode may include an elongated narrow cylindrical needle which is solid or hollow with a flat, rounded, pointed or slanted distal end. Typically electrodes of this sort are known in the art as “blade”, “loop” or “snare”, “needle” or “ball” electrodes.
As mentioned above, the handpiece of the electrosurgical pencil is connected to a suitable electrosurgical energy source (i.e., generator) which produces the radio-frequency electrical energy necessary for the operation of the electrosurgical pencil. In general, when an operation is performed on a patient with an electrosurgical pencil, electrical energy from the electrosurgical generator is conducted through the active electrode to the tissue at the site of the operation and then through the patient to a return electrode. The return electrode is typically placed at a convenient place on the patient's body and is attached to the generator by a conductive material. Typically, the surgeon activates the controls on the electrosurgical pencil to select the modes/waveforms to achieve a desired surgical effect.
The power or energy parameters are typically controlled from outside the sterile field which requires an intermediary like a circulating nurse to make such adjustment.
A typical electrosurgical generator has numerous controls for selecting an electrosurgical output. For example, the surgeon can select various surgical “modes” to treat tissue: cut, blend (blend levels 1-3), low cut, desiccate, fulgurate, spray, etc. The surgeon also has the option of selecting a range of power settings typically ranging from 1-300 W. As can be appreciated, this gives the surgeon a great deal of variety when treating tissue. However, so many options also tend to complicate simple surgical procedures and may lead to confusion. Moreover, surgeons typically follow preset control parameters and stay within known modes and power settings. Therefore, there exists a need to allow the surgeon to selectively control and easily select and regulate the various modes and power settings utilizing simple and ergonomically friendly controls associated with the electrosurgical pencil.
Existing electrosurgical instrument systems allow the surgeon to change between two pre-configured settings (i.e., coagulation and cutting) via two discrete switches disposed on the electrosurgical pencil itself. Other electrosurgical instrument systems allow the surgeon to increment the power applied when the coagulating or cutting switch of the instrument is depressed by adjusting or closing a switch on the electrosurgical generator. The surgeon then needs to visually verify the change in the power being applied by looking at various displays and/or meters on the electrosurgical generator. In other words, all of the adjustments to the electrosurgical instrument and parameters being monitored during the use of the electrosurgical instrument are typically located on the electrosurgical generator. As such, the surgeon must continually monitor the electrosurgical generator during the surgical procedure. Furthermore, someone outside the sterile field must continually adjust the parameters of the electrical instrument, which prolongs the duration of the procedure.
Accordingly, the need exists for electrosurgical instruments which do not require the surgeon to continually monitor the electrosurgical generator during the surgical procedure. Further, a need exists for electrosurgical instruments, which permit the surgeon to accurately self-adjust the electrical parameters of the instrument from within the sterile field. In addition, the need exists for electrosurgical instruments which may be configured such that the power output can be adjusted without the surgeon having to turn his/her vision away from the operating site and toward the electrosurgical generator.
The present disclosure relates to electrosurgical pencils having a plurality of hand-accessible variable controls.
According to an aspect of the present disclosure, an electrosurgical pencil is provided including an elongated housing configured to support an electrocautery electrode extending distally therefrom; at least one voltage divider network supported on the housing, the at least one voltage divider network operable to electrically connect to a source of electrosurgical energy for controlling at least one of an intensity and a mode of electrosurgical energy being delivered to the electrocautery electrode; and an intensity controller slidably supported on the housing. The intensity controller is configured to exert a force on the at least one voltage divider network and to provide a tactile feedback to a user of the electrosurgical pencil as the intensity controller is moved relative to the housing.
The intensity controller may include a nub extending from a surface thereof. The nub may be configured to contact the at least one voltage divider network and affect the at least one voltage divider network as the intensity controller is moved relative to the housing.
The intensity controller may include a spring plunger assembly configured to operatively engage a tactile feature formed in the housing. The spring plunger assembly may include a stem and a biasing member. The stem may be disposed on a side opposite to the nub and is configured to retain an actuator.
The biasing member may be configured to maintain the actuator in contact with the tactile feature formed in the housing. The actuator may be disposed at one of a distal, a proximal and a substantially aligned location with respect to the nub.
The intensity controller may include a spring lever assembly configured to operatively engage a tactile feature formed in the housing. The spring lever assembly may include a lever and a biasing member for maintaining the lever in contact with the tactile feature. The lever may be pivotally connected to a body portion of the intensity controller, on a side opposite to the nub.
The biasing member may be a spring.
A tip of the lever may be disposed at one of a distal, a proximal and a substantially aligned location with respect to the nub.
According to another aspect of the present disclosure, an electrosurgical device configured for connection to a source of electrosurgical energy is provided. The electrosurgical device includes a housing; an electrical circuit supported within the housing, the electrical circuit being connectable to the source of electrosurgical energy; and a controller slidably supported on the housing, wherein the controller is configured to exert a force on the electrical circuit to affect a change in the electrical circuit and to provide a tactile feedback to a user of the electrosurgical device as the controller is moved relative to the housing.
The controller may include a nub extending from a surface thereof and being dimensioned to contact the electrical circuit. The electrical circuit may be a voltage divider network capable of controlling at least one of an intensity and a mode of electrosurgical energy being delivered, and wherein the nub is configured to contact the voltage divider network and affect a change in at least one of the intensity and the mode of electrosurgical energy being delivered as the controller is moved relative to the housing.
The controller may include a spring plunger assembly configured to operatively engage a tactile feature formed in the housing. The spring plunger assembly may include a stem and a biasing member. The stem may be disposed on a side opposite to the nub and is configured to retain an actuator. The biasing member may be configured to maintain the actuator in contact with the tactile feature formed in the housing. The actuator may be disposed at one of a distal, a proximal and a substantially aligned location with respect to the nub.
The controller may include a spring lever assembly configured to operatively engage a tactile feature formed in the housing. The spring lever assembly may include a lever and a biasing member for maintaining the lever in contact with the tactile feature. The lever may be pivotally connected to a body portion of the intensity controller, on a side opposite to the nub. The biasing member may be a spring.
A tip of the lever may be disposed at one of a distal, a proximal and a substantially aligned location with respect to the nub.
According to a further aspect of the present disclosure, an electrosurgical pencil is provided including an elongated housing configured to support an electrocautery electrode extending distally therefrom; at least one voltage divider network supported on the housing, the at least one voltage divider network operable to electrically connect to the source of electrosurgical energy for controlling at least one of an intensity and a mode of electrosurgical energy being delivered to the electrocautery electrode; and an intensity controller slidably supported on the housing, wherein the intensity controller is configured to exert a force on the at least one voltage divider network and provide a tactile feedback to a user of the electrosurgical pencil as the intensity controller is moved relative to the housing.
The intensity controller may include a lever pivotally connected to a body portion thereof and contactable with the housing and the at least one voltage divider network. The lever may include a first end configured for engagement with a tactile feature formed in the housing. The lever may include a second end configured for engagement with the at least one voltage divider network.
The intensity controller may include a biasing member configured to maintain a first end of the lever in contact with the tactile feature formed in the housing. The intensity controller may include a biasing member configured to maintain a second end of the lever in contact with the at least one voltage divider network. The intensity controller may include a biasing member configured to maintain a first end of the lever in contact with the tactile feature formed in the housing and to maintain a second end of the lever in contact with the at least one voltage divider network.
The biasing members may be one of a coil spring, a tension spring and a compression spring. The tactile feature may include one or more adjacent detents. In use, movement of the first end of the lever into the one or more adjacent detents may cause the second end of the lever to substantially strike the at least one voltage divider network.
According to yet another aspect of the present disclosure, an electrosurgical device configured for connection to a source of electrosurgical energy is provided. The electrosurgical device includes a housing; an electrical circuit supported within the housing, the electrical circuit being connectable to the source of electrosurgical energy; and a controller slidably supported on the housing, wherein the controller is configured to exert a force on the electrical circuit to affect a change in the electrical circuit and to exert a force on a surface of the housing to provide a tactile feedback to a user of the electrosurgical device as the controller is moved relative to the housing.
The electrical circuit may comprise at least one voltage divider network capable of controlling at least one of an intensity and a mode of electrosurgical energy being delivered, and wherein the controller may include a lever pivotally connected to a body portion thereof and contactable with the housing and the at least one voltage divider network.
The lever may include a first end configured for engagement with a tactile feature formed in the housing. The lever may include a second end configured for engagement with the at least one voltage divider network.
The controller may include a biasing member configured to maintain a first end of the lever in contact with the tactile feature formed in the housing. The controller may include a biasing member configured to maintain a second end of the lever in contact with the at least one voltage divider network. The controller may include a biasing member configured to maintain a first end of the lever in contact with the tactile feature formed in the housing and to maintain a second end of the lever in contact with the at least one voltage divider network. The biasing members may be one of a coil spring, a tension spring and a compression spring.
The tactile feature may include one or more adjacent detents.
In use, movement of the first end of the lever into the one or more adjacent detents may cause the second end of the lever to substantially strike the at least one voltage divider network.
According to still another aspect of the present disclosure, an electrosurgical pencil is provided including an elongated housing configured to support an electrocautery electrode extending distally therefrom; at least one voltage divider network supported on the housing, the at least one voltage divider network operable to electrically connect to the source of electrosurgical energy for controlling at least one of an intensity and a mode of electrosurgical energy being delivered to the electrocautery electrode, wherein the at least one voltage divider network defines a plurality of tactile enhancement features; and an intensity controller slidably supported on the housing, wherein the intensity controller is configured to exert a force on the at least one voltage divider network and engage the tactile enhancement feature and provide a tactile feedback to a user of the electrosurgical pencil as the intensity controller is moved relative to the housing.
The electrosurgical pencil may further include a tactile mask overlying at least a portion of the at least one voltage divider network, wherein the tactile mask defines the plurality of tactile enhancement regions. The tactile enhancement features of the tactile mask may include at least one aperture formed therein.
The intensity controller may include a tactile feedback transmitting feature configured to project through the at least one aperture formed in the tactile mask to selectively engage the at least one voltage divider network. The tactile feedback transmitting feature may include at least one of an actuator and a nub selectively positionable within the aperture of the tactile mask.
At least one of an actuator and a nub may extend from a surface of the intensity controller, in a direction toward the tactile mask.
The tactile feedback transmitting feature may further comprise a spring plunger assembly including a biasing member for maintaining the tactile feedback transmitting feature in contact with at least one of the voltage divider network and the tactile mask.
The tactile feedback transmitting feature may be configured to selectively strike the at least one voltage divider network.
According to yet another aspect of the present disclosure, an electrosurgical device, configured for connection to a source of electrosurgical energy, is provided. The electrosurgical device comprises a housing; an electrical circuit supported within the housing, the electrical circuit being connectable to the source of electrosurgical energy, wherein the electrical circuit is provided with at least one tactile enhancement feature; and a controller slidably supported on the housing, wherein the controller is configured to exert a force on the electrical circuit to affect a change in the electrical circuit and to exert a force on a surface of the housing to engage the tactile enhancement feature and provide a tactile feedback to a user of the electrosurgical device as the controller is moved relative to the housing.
The electrosurgical device may further include a tactile mask overlying at least a portion of electrical circuit, wherein the tactile mask defines the plurality of tactile enhancement regions.
The tactile enhancement features of the tactile mask may include at least one aperture formed therein.
The controller may include a tactile feedback transmitting feature configured to project through the at least one aperture formed in the tactile mask to selectively engage the electrical circuit. The tactile feedback transmitting feature may include at least one of an actuator and a nub selectively positionable within the aperture of the tactile mask. At least one of an actuator and a nub may extend from a surface of the controller, in a direction toward the tactile mask.
The tactile feedback transmitting feature may further include a spring plunger assembly including a biasing member for maintaining the tactile feedback transmitting feature in contact with at least one of the electrical circuit and the tactile mask.
The tactile feedback transmitting feature may be configured to selectively strike the electrical circuit.
The electrical circuit may include at least one voltage divider network.
According to still another aspect of the present disclosure, an electrosurgical pencil is provided including an elongated housing configured to support an electrocautery electrode extending distally therefrom; at least one voltage divider network supported on the housing, the at least one voltage divider network operable to electrically connect to the source of electrosurgical energy for controlling at least one of an intensity and a mode of electrosurgical energy being delivered to the electrocautery electrode; and an intensity controller slidably supported on the housing, wherein the intensity controller is configured to exert a force on each of the housing and the at least one voltage divider network, wherein the intensity controller provides a tactile feedback to a user of the electrosurgical pencil as the intensity controller is moved relative to the housing.
The intensity controller may include a torsion spring pivotally supported on a body portion thereof, wherein the torsion spring is in contact with at least one of the housing and the electrical circuit. The torsion spring may include a first leg configured for engagement with a tactile feature formed in the housing. The torsion spring may include a second leg configured for engagement with the at least one voltage divider network.
The torsion spring may include a first leg configured for engagement with a tactile feature formed in the housing and a second leg configured for engagement with the at least one voltage divider network.
The intensity controller may include a link assembly pivotally supported on a body portion. The link assembly may include a first leg configured for engagement with a tactile feature formed in the housing; and a second leg configured for engagement with the at least one voltage divider network.
The link assembly may further include a biasing member interposed between the first leg and the second leg for maintaining the first leg in engagement with the tactile feature formed in the housing and for maintaining the second leg in engagement with the at least one voltage divider network.
The biasing member may be configured for maintaining the first leg in engagement with the tactile feature formed in the housing. The biasing member may be configured for maintaining the second leg in engagement with the at least one voltage divider network.
According to still another aspect of the present disclosure, an electrosurgical device, configured for connection to a source of electrosurgical energy, is provided. The electrosurgical device comprises a housing; an electrical circuit supported within the housing, the electrical circuit being connectable to the source of electrosurgical energy; and a controller slidably supported on the housing, wherein the controller is configured to exert a force on each of the housing and the electrical circuit to affect a change in the electrical circuit and to provide a tactile feedback to a user of the electrosurgical device as the controller is moved relative to the housing.
The controller may include a torsion spring pivotally supported on a body portion thereof, wherein the torsion spring is in contact with at least one of the housing and the electrical circuit. The torsion spring may include a first leg configured for engagement with a tactile feature formed in the housing. The torsion spring may include a second leg configured for engagement with the electrical circuit. The torsion spring may include a first leg configured for engagement with a tactile feature formed in the housing and a second leg configured for engagement with the electrical circuit.
The controller may include a link assembly pivotally supported on a body portion. The link assembly may include a first leg configured for engagement with a tactile feature formed in the housing; and a second leg configured for engagement with the electrical circuit. The link assembly may further include a biasing member interposed between the first leg and the second leg for maintaining the first leg in engagement with the tactile feature formed in the housing and for maintaining the second leg in engagement with the electrical circuit. The biasing member may be configured for maintaining the first leg in engagement with the tactile feature formed in the housing. The biasing member may be configured for maintaining the second leg in engagement with the electrical circuit.
The electrical circuit may include at least one voltage divider network supported on the housing, the at least one voltage divider network operable to electrically connect to the source of electrosurgical energy for controlling at least one of an intensity and a mode of electrosurgical energy being delivered to the electrocautery electrode.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with a general description of the invention given above, and the detailed description of the embodiments given below, serve to explain the principles of the invention.
Preferred 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. As used herein, the term “distal” refers to that portion which is further from the user while the term “proximal” refers to that portion which is closer to the user or surgeon.
As seen in
As seen in
With continued reference to
As seen in
Each activation button 120a-120c controls the transmission of RF electrical energy supplied from generator “G” to electrode 106. Switch plate 124 is positioned over the top of a voltage divider network 127 (hereinafter “VDN 127”) such that tactile elements 122a-122c are in operative association therewith.
As seen in
As seen in
Slidable manipulation or movement of intensity controller 128 adjusts the power parameters (e.g., voltage, power and/or current intensity) and/or the power verses impedance curve shape to affect the output intensity of the waveform.
In order to vary the intensity of the power parameters of electrosurgical pencil 100, the surgeon displaces intensity controller 128, by manipulating at least one of nubs 129a, 129b, in either of the directions indicated by double-headed arrow “X” (see
Intensity controller 128 is also operable to provide a degree of tactile feedback by the inter-engagement of resilient finger 128a of intensity controller 128 in detents 131 formed along an inner surface of right-half shell section 102a (see
As seen in
Upper and lower layers 140a, 140b of VDN 127 are separated by a dividing layer 140c. Dividing layer 140c includes a first series of apertures 142c formed therein which are in vertical registration with electrical contacts 142a, 142b. Dividing layer 140c includes a second aperture 144c formed therein which is in vertical registration between electrical contacts 144a provided on upper layer 140a and a variable resistance element 144d provided on lower layer 140b. Upper layer 140a, lower layer 140b, and dividing layer 140c are supported on a support layer 140d.
In operation, and depending on the particular electrosurgical function desired, the surgeon depresses one of activation buttons 120a-120c, in the direction indicated by arrow “Y” (see
Reference may be made to U.S. Application Ser. No. 11/337,990 filed on Jan. 24, 2006, the entire content of which is incorporated herein by reference, for a more detailed discussion of the construction and operation of electrosurgical pencil 100.
Turning now to
As seen in
In use, as slider 228a is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, nub 228a3 moves along VDN 127 thereby affecting VDN 127 while actuator 228a6 of the spring plunger assembly inter-engages with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100 to thereby provide a degree of tactile feedback to the user of electrosurgical pencil 100. Biasing member 228a5 functions to maintain nub 228a3 in contact with VDN 127 and actuator 228a6 of the spring plunger assembly in contact with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100.
As seen in
In use, as slider 228b is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, nub 228b3 moves along VDN 127 thereby affecting VDN 127 while tip 228b7 of lever 228b6 of the spring lever assembly inter-engages with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100 to thereby provide a degree of tactile feedback to the user of electrosurgical pencil 100. Biasing member 228b5 functions to maintain nub 228b3 in contact with VDN 127 and tip 228b7 of lever 228b6 of the spring lever assembly in contact with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100.
As seen in
In use, as slider 228c is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, nub 228c3 moves along VDN 127 thereby affecting VDN 127 while tip 228c7 of lever 228c6 of the spring lever assembly inter-engages with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100 to thereby provide a degree of tactile feedback to the user of electrosurgical pencil 100. Biasing member 228c5 functions to maintain nub 228c3 in contact with VDN 127 and tip 228c7 of lever 228c6 of the spring lever assembly in contact with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100.
In each of sliders 228a-228c shown in
Although the embodiment in
In use, as slider 228d is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, nub 228d3 moves along VDN 127 thereby affecting VDN 127 while tip 228d7 of lever 228d6 of the spring lever assembly inter-engages with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100 to thereby provide a degree of tactile feedback to the user of electrosurgical pencil 100. Biasing member 228d5 functions to maintain nub 228d3 in contact with VDN 127 and tip 228d7 of lever 228d6 of the torsion spring lever assembly in contact with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100. One advantage to using a torsion spring lever assembly configuration as set forth in
Turning now to
As seen in
As seen in
In use, as slider 328a is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, first end 328a4 of lever 328a3 inter-engages with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100 to thereby provide a degree of tactile feedback to the user of electrosurgical pencil 100 while second end 328a5 of lever 328a3 moves along VDN 127 thereby affecting VDN 127. In particular, as first end 328a4 of lever 328a3 moves from one detent or tactile features 131 to an adjacent detent or tactile features 131, first end 328a4 of lever 328a3 is moved towards body portion 328a1 and second end 328a5 of lever 328a3 moves off of or reduces a pressure on VDN 127 and also is moved towards body portion 328a1. As first end 328a4 of lever 328a3 is moved into the adjacent detent or tactile features 131 second end 328a5 of lever 328a3 substantially strikes down onto, imparts or otherwise increases a pressure on VDN 127.
Turning now to
As seen in
Tactile mask 429 includes an elongate body portion 429a configured to overlie VDN 127. Body portion 429a defines a plurality of apertures or windows 429b formed therein along a length thereof. Tactile mask 429 is positioned over VDN 127 at a location such that apertures 429b may align or register with variable resistance elements 144d provided on lower layer 140b of VDN 127 (see
In use, as slider 428a is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, actuator 428a6 of spring plunger assembly moves over and between apertures 429b formed in tactile mask 429. In so doing, actuator 428a6 of spring plunger assembly impacts or strikes against VDN 127. Additionally, the inter-engagement of actuator 428a6 of spring plunger assembly with apertures 429b formed in tactile mask 429 provides a degree of tactile feedback to the user of electrosurgical pencil 100.
As seen in
In use, as slider 428b is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, nub 428b3 of slider 428b moves over and between apertures 429b formed in tactile mask 429. In so doing, nub 428b3 of slider 428b contacts VDN 127. Additionally, the inter-engagement of nub 428b3 of slider 428b with apertures 429b formed in tactile mask 429 provides a degree of tactile feedback to the user of electrosurgical pencil 100. Moreover, tip 428b7 of lever 428b6 rides against an inner surface of housing 102 of pencil 100 and biasing member 428b5 act on tip 428b7 of lever 428b6 to exert a force on body portion 428b1 and thereby press nub 428b3 of slider 428b against tactile mask 429.
Tactile mask 429 may be constructed from a rigid, semi-rigid or non-rigid material, from a resilient or non-resilient material, from a conductive or non-conductive material, from any combination thereof, or from any material suitable for the intended purpose of defining apertures and transmitting forces through said apertures.
Turning now to
As seen in
In use, as slider 528a is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, second leg 528a5 of torsion spring 528a3 moves along VDN 127 thereby affecting VDN 127 while first leg 528a4 of torsion spring 528a3 inter-engages with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100 to thereby provide a degree of tactile feedback to the user of electrosurgical pencil 100. As first leg 528a4 of torsion spring 528a3 is flexed downwardly, in the direction of body portion 528a1, as slider 528a is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, second leg 528a5 of torsion spring 528a3 is pressed more or less into the surface of VDN 127.
As seen in
In use, as slider 528b is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, second leg 528b5 of link assembly 528b3 moves along VDN 127 thereby affecting VDN 127 while first leg 528b4 of link assembly 528b3 inter-engages with detents or tactile features 131 formed in housing 102 of electrosurgical pencil 100 to thereby provide a degree of tactile feedback to the user of electrosurgical pencil 100. As first leg 528b4 of link assembly 528b3 is moved downwardly, in the direction of body portion 528b1, as slider 528b is moved distally and proximally relative to housing 102 of electrosurgical pencil 100, biasing member 528b6 transmits forces to second leg 528b5 of link assembly 528b3 to press more or less into the surface of VDN 127.
Although the subject apparatus has been described with respect to preferred embodiments, it will be readily apparent, to those having ordinary skill in the art to which it appertains, that changes and modifications may be made thereto without departing from the spirit or scope of the subject apparatus.
The present application claims the benefit of and priority to U.S. Provisional Application Ser. No. 61/040,836, filed on Mar. 31, 2008, the entire content of which is incorporated herein by reference.
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