U.S. Pat. No. 3,730,188, whose contents are hereby incorporated by reference, describes electrosurgical apparatus for dental use, and describes one form of electrical circuit for generating radio-frequency (RF) currents with different waveform shapes to optimize tissue cutting, hemostasis, or both. Similar apparatus is employed in the medical and veterinarian fields. Different forms of the apparatus are available commercially from a number of suppliers.
In a typical commercial machine, a socket is provided connected to the RF generator on the machine front panel to receive an electrical plug connected at one end of an insulated wire, at the opposite end of which is provided a handpiece to be held by the dentist or physician. The handpiece is configured to receive a removable working electrode by which the RF currents can be applied to the patient's tissue for cutting or hemostasis. Typical electrodes commonly in use include needle shapes, wire circular or diamond loop shapes, ball shapes or blade shapes. These electrodes are custom designed for each machine and are thus expensive. In addition, the working end, usually of exposed metal at the tip, is elsewhere enclosed in an insulating layer, to avoid RF current leakage to the patient other than from the exposed tip. After use, the electrodes from the handpiece are sterilized for use with the next patient. Aside from the time wasted in the sterilization process, the latter reduces the usable lifetime of the electrode, thus requiring more frequent replacement, adding to the already high cost.
The trend, especially in the medical arts, is toward disposable instruments, which can be discarded after use. There already exist standard-sized disposable scalpel blades and needles available at low cost in sterilized packages, for use with non-electrosurgical hand instruments, but these will not fit into the available electrosurgical handpieces.
One supplier of medical electrosurgical equipment has attempted to fill this need by designing new electrosurgical equipment with a new handpiece adapted to receive disposable scalpel blades. But, the equipment is very expensive, and the disposable blades are not of the inexpensive variety available at low cost, but are custom-designed with internal heating elements regulated by the equipment, the regulated high temperature assumed by the blade during use producing as alleged hemostasis of blood vessels as they are cut. Thus the need for low cost equipment with low cost standard scalpel electrodes is not satisfied by this equipment. Moreover, the handpiece is not capable of receiving needle electrodes.
USPTO Backgrounds
USPTO Backgrounds