Abstract:
An improved electrocautery instrument includes a manually retractable-extendable electrode-blade with a vacuum channel disposed therebeneath. A guide in close-spaced relationship to the electrode-blade at the end of the instrument facilitates the scraping off and cleaning of the blade-electrode as it is retracted out of the way to configure the instrument for use as an uncluttered vacuum wand.

Description:
BACKGROUND OF THE INVENTION 
     Certain known electrocautery instruments for performing surgery with simultaneous hemostasis commonly become fouled with tissue and protein that adhere to the electrode. In order to maintain the efficient usefulness of such instruments throughout a surgical procedure, it is necessary to clean or replace the electrode frequently. In addition, it is usually desirable to have a suction port close to the tissue being cut and cauterized in order to remove the tissue rubble, blood, smoke and the like, that are present at the electrocautery site. And, it is usually desirable to perform the operations of electrocautery and evacuation of the site in selectable order rather than simultaneously. Devices which have these features are discussed in the literature (see, for example, U.S. Pat. Nos. 3,884,237, 3,906,955 and 3,828,780). However, these devices provide little or no control over the deployment of the electrode relative to the insulating handle in order to provide control of cutting and cauterization of tissue as well as to facilitate cleaning and evacuation of the operating site. 
     SUMMARY OF THE INVENTION 
     In accordance with the present invention, an improved electrocautery device includes manual control of the deployment of the electrode for cutting control as well as cleaning of the electrode. In retracted position, the electrode is out of the way for convenient use of the instrument as a vacuum wand for evacuating the operating site. In extended position, the electrode is cleaned off and ready for continued use in electrocautery procedures. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of the electrocautery instrument of the present invention; 
     FIG. 2 is a side sectional view of the electrocautery instrument of FIG. 1; and 
     FIG. 3 is an end sectional view of the electrocautery instrument of FIG. 1. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring now to FIGS. 1 and 2, there are shown perspective and side sectional views of the electrocautery instrument of the present invention having an electrode 9 in the upper portion and a vacuum channel 11 in the lower portion. The body 13 of the instrument is conveniently shaped to rest in a surgeon&#39;s hand and includes a finger-actuated slide mechanism 15 for manually extending and retracting the electrode-blade 17. Extension and retraction of the electrode-blade 17 through guide 19 in slidable engagement therewith scrape off any adhering tissue debris, thus forcing such debris to accumulate at the tip 20 of the instrument where it can be wiped off merely by passing the tip 20 over sterilized gauze, or the like. Then, when desired, the electrode-blade 17 may again be extended by sliding the finger-actuated mechanism 15 forward to allow the cleaned electrode-blade 17 to protrude from the guide 19. The electrode-blade 17 is preferably wider than it is thick, as shown in FIGS. 1 and 2, to facilitate directional or slicing movement through tissue. Of course, the guide means, as referred to herein for the electrode-blade 17, may simply be a similarly-shaped aperture of the body at the forward end of the upper channel. 
     While the electrode-blade 17 is in the retracted position, the instrument is usable as an improved vacuum wand with a vacuum port 18 positioned in the lower, forward end of the instrument. With the electrode-blade 17 out of the way, there are no protrusions or obstructions on the forward end of the instrument to inhibit thorough evacuation of blood and tissue debris and smoke from the operating site. Further electrocautery procedures may then be pursued simply by extending the cleaned electrode-blade 17 through the guide 19. 
     The electrode-blade 17 is electrically connected via insulated wire 22 to a radio frequency (R.F.) signal source 24. A foot-operated switch 26 may be connected as shown to control the application of R.F. signal to the electrode-blade 17 or, more typically, may be connected to the supply 24 to enable and disable the R.F. generator so that R.F. signal is supplied or not supplied, respectively, to the electrode-blade 17. For convenience, the instrument may be made disposable and sterilized for one operation with a wire 22 attached to the blade support 23 that is free to slide in and out of the guide 19 in body 13 as the blade 17, which is attached to the blade support 23, is retracted and extended. Alternatively, the electrode-blade 17 may simply be a flattened, forward portion of the blade support 23 that is free to slide within the guide 19 which is correspondingly flattened at the forward end thereof, as shown. The finger-actuated mechanism 15 may include an integral protrusion 27 which snaps down over a pin in the support 23 to complete the assembly. The body 13 and mechanism 15 may be made of biologically-inert plastic such as TEFLON (trademark of DuPont Company) or other suitable dielectric material which can insulate the electrical circuitry from the surgeon&#39;s hand and which can be sterilized after manufacture. The protrusion 27 that couples the mechanism 15 to the support 23 slides in a longitudinal slot 29 within body 13 and the mechanism 15 provides electrical insulation over the slot to protect the surgeon&#39;s finger from R.F. signal present on the guide 19, support 23 and blade 17. 
     The vacuum channel 11 in the lower portion of the body 13 is connected to a vacuum supply 30 via flexible conduit or tube 32. The inlet port 18, as shown in FIGS. 1, 2 and 3, may include openings that are directed forwardly, sidewardly and downwardly to facilitate the convenient evacuation of an operating site.