1. Field of the Invention This invention relates to a new and useful improvement in an aspirator tip for use with an electrosurgical instrument and more particularly, to an adjustable and disposable aspirator tip which may be used with a cautery handpiece. 2. Brief Description of the Prior Art Surgical electrocautery instruments for performing surgery with simultaneous hemostasis are well known in the art. Many electrocautery handpieces have a built-in integral vacuum channel or conduit passing therethrough wherein the vacuum channel, used for aspiration, commonly becomes fouled with bits of tissue that readily adhere to the walls of the vacuum tubing and/or aspiration tip. Nevertheless, since 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, such handpieces may have an integral vacuum channel which is difficult to clean and, therefore, necessarily disposable. Also, none of these prior art cautery handpieces provide a suction port which actually surrounds the cutting or cautery blade to provide the most efficient use of such

when needed. Weber, Jr.., in U.S. Patent 4,307,720, describes a cautery handpiece with a retractable blade and a vacuum channel integral with the handle. When the blade (which is moveable) is retracted, the blade is cleaned by scraping it against a slot in the handpiece and in this blade-retraced position, the handpiece becomes a vacuum wand. The Weber device must be discarded after use because the channel cannot be readily cleaned. Johnson, in U.S. Patent 4,719,914, describes a handpiece that has an integral vacuum channel that has an attachment which, though structurally very different from the tip described herein, performs a function similar to the present invention. Johnson's handpiece has an integral vacuum channel with holes near the distal tip close to the base of the electrocautery needle. A retractable sleeve can be placed over the tip of Johnson's handpiece to conduct, adjust and otherwise control the vacuum near the tip of the electrocautery needle. The retractable sleeve is particularly useful for removing smoke. While the tip can be easily disposed of, the integral vacuum channel cannot be cleaned without undo difficulty and the handpiece must be discarded after use. The prior art is exemplified by these patents. All the electrocautery instruments now in use in surgery have certain similarities and certain deficiencies in design. All instruments

of this type have an electrode for high frequency electrocoagulation. Likewise, most instruments of this type have a tube associated with the blade to either supply a liquid to the surgical site or aspirate blood, irrigating fluid or air and/or smoke away from the site. All of the foregoing devices have vacuum channels integral with their handle which makes it difficult and costly to clean. All such prior art handpieces are generally regarded as disposable. It is, therefore, a desirable object of this invention to provide a handpiece which can be reused and to which a disposable aspiration tip and tubing can be readily attached. SUMMARY OF THE INVENTION One of the objects of this invention is to proved a disposable aspirator assembly for use with an electrosurgical and/or electrocauterizing instrument providing an evacuation system of more efficient design for the removal of blood, fluids and smoke from the surgical site. Another object of the invention is to provide a new and improved disposable aspirator assembly for use with an electrocautery instrument which assembly permits selective application of the vacuum during surgery. Another object of this invention is to provide a disposable aspirator assembly having an adjustable tip for use in an

electrocautery instrument wherein the aspirator tip may be adjusted to enclose the surgical site to force circulation of air through the region of surgery by application of a vacuum thereto. Another object of the invention is to provide a cautery handpiece with a disposable aspirator assembly which, in combination, is comfortable to grasp and manipulate. Still another object of the invention is to provide a disposable yet efficient aspirator assembly and associated tubing for use with an electrocautery handpiece which enables the practitioner to reuse the electrocautery handpiece following surgery. Other objects of the invention will become apparent from time to time throughout the specification and claims as hereinafter related. DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of one embodiment of the aspirator assembly tip of the present invention affixed to the tip of an electrocautery handpiece; Figure 2 is a fragmentary side sectional view of the disposable aspirator tip taken along line 2-2 of Figure 1. Figure 3 is an end view of Figure 2. Figure 4 is a sectional view of the preferred embodiment of the disposable aspirator assembly with fluted handpiece

connector and nipple-type hose connector. Figure 5 shows a plastic tip placed inside the aspirator tip of Figure 4. Figure 6 is a perspective view of the preferred embodiment of the aspirator tip of the present invention. Figure 7 is an end-on view of the preferred embodiment of Figure 6 viewed from the left. DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to Figures 1-3, a first (not preferred) embodiment of a disposable aspirator assembly for use with an electrocautery handpiece, generally indicated at 10, is shown. The aspirator assembly, generally indicated at 12, consists of a single length of tubing preferably formed of an elastomer such as silicone. The tubing has a tip end 19 through which a blade 13 of the electrocautery handpiece 10 projects. An oval-shaped hole 14 having a greatest dimension slightly smaller than the outer diameter of the blade through the wall of the tubing to facilitate connection of the aspirator tip to the handpiece. The functional and structural relationship of the oval hole 14 to the aspirator tip 19 is shown more clearly in Figures 2 and 3. The tubing comprising the aspirator assembly may be conveniently formed to the general contour of the handpiece and attached to the handpiece by releasable mating connectors on the handpiece 15 and on the

assembly 16. The hook and loop type fasteners are convenient for this purpose; one type of mating connector, for example, the hook, applied to the handle 11 of the handpiece and/or to the tip- energizing electrical wire 15 and the loop to the outer wall of the tubular aspirator assembly. Alternatively, the handle 11 of the handpiece may have a longitudinal channel (not shown) molded therein open throughout its length to the outside and extending substantially the length of the handpiece. If the channel is sized properly, the compressible elastomeric tubing may be pressed into the channel along its length and releasably restrained therein during use. Figure 4 shows a preferred embodiment of the disposable aspirator assembly of the present invention. The assembly, generally indicated as 40, connects to vacuum tubing (not shown) by means of a releasable connector nipple 43. The assembly 40 is preferably made of an elastomer which has sufficient elasticity to permit the fluted or funnel-shaped end (the trailing end) 41 of the assembly to be forced securely over the end of the electrocautery handpiece 10 (Figure 1) near the base of the blade 13 to form a substantially vacuum-tight connection. The other leading end of the disposable aspirator tip 42 opposite the fluted trailing end 41 circularly encloses the blade permitting removal of smoke and debris from the surgical site. Alternatively, the aspirator tip of

Figure 4 may be molded of a single piece of plastic and a funnel- shaped elastomer sleeve-like insert (not shown) used to form a vacuum tight coupling between the end of the electrocautery handpiece and the end 41 of the disposable tip. Figure 5 shows yet another preferred embodiment of the disposable aspirator tip wherein the disposable assembly 40 is a single piece of molded elastomer. A first plastic insert 51 may place within the tubular elastomer assembly as shown to provide greater rigidity near the blade. Such an insert may optionally have struts (not shown) projecting radially inward from the inner lumen of the insert which struts touch the electrocautery needle thereby circumferentially stabilizing the assembly with respect to the needle. A second plastic insert 52 in the form of a hose connector nipple may be placed within the assembly as shown to securely connect the vacuum tubing (not shown) to the aspirator assembly. An opening (not shown) may be cut in the wall of the assembly where it may be conveniently covered by a finger when suction is desirable and uncovered when suction is unnecessary. It is obvious that the above-described disposable aspirator assembly is readily adaptable to other surgical handpieces such as laser surgery handpieces thereby rendering such other handpieces reusable. The cautery handpiece with the aspirator assembly affixed

thereto must be comfortable to grasp and easily manipulated much as one would hold a pencil while writing. An aspirator assembly designed to matingly engage any cylindrical cautery handpiece is shown in Figure 6. The assembly 60 comprises an aspirator tip portion 63 comprising an offset hollow tube similar to the aspirator tip indicated at 19 in Figure 2, and a handle portion 64. The aspirator tip portion 63 is a bent tube having a central first lumen 66. The aspirator tip portion 63 has a proximal axis A and a distal axis B offset from one another but parallel to each other. The handle portion 64, shown in Figures 6 and 7, comprises an elongate substantially cylindrical elastomeric member having irregular wall thickness and having a slot 67 extending the length thereof. The portion of the wall opposite the slot 67 is the thickest and has a second lumen 62 passing therethrough coaxial with proximal axis A and extending the entire length of the hand portion. The proximal axis A is collinear with the axis of the lumen 62 within the handle portion 64. The handle portion 64 has a concave inner surface 61 which matingly engages the outer surface of a cautery handpiece (not shown in Fig. 6) . Turning now to Fig. 7, the handpiece 11 is pressed into the cylindrical recess within the handle portion 64 of the assembly trough the open slot 67. The handle portion is fabricated using a flexible elastomer thereby permitting the slot 67 to be forced open to accommodate the cautery

in Figure 7. It will be seen that the objects of the invention set forth above are efficiently attained and since certain changes may be made in carrying out the above construction set forth without parting from the spirit and scope of the invention, it is intended that all matter and examples contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.