Surgery – Truss – Pad
Patent
1985-07-30
1987-01-20
Howell, Kyle L.
Surgery
Truss
Pad
12830317, A61B 1736
Patent
active
046373900
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to surgery and more specifically it concerns electrosurgical instruments for bloodless surgical procedures.
BACKGROUND ART
Known in the art is an electrosurgical instrument for dissecting various tissues, comprising an active electrode, i.e., a double-edged disk knife to which a diathermic current is fed, and a passive electrode. The knife blade is provided with an adjoining scraper (cf. USSR Inventor's Certificate No. 624,617 published 1978).
During surgery the disk knife receives rotation and is fed with an electric current. The tissue operated upon is incised by virtue of motion performed by the instrument. The coagulate formed on the knife blade is removed by the scraper.
The aforedescribed instrument operates on the bipolar monoactive cutting principle, which involves a passive plate electrode connected to a patient's body a certain distance apart from the knife, i.e., an active electrode. It is due to r.f. current dispersion and useless heating of the tissues located between the active electrode and the passive one that surgery on the internal organs becomes uncontrolled and proceeds unstably. This is turn makes the instrument inapplicable for surgical interference on vitally important organs, e.g., for dissecting the sternum, the spine, the hipbone, and the like. Moreover, the device in question is unsuitable for surgery on the aforementioned osseocartilaginous tissues also due to the fact that these tissues features increased mechanical strength so that even a ground-sharp disk-shaped electrosurgical knife fails to destruct such tissues, since even an inconsiderable "biting" of the knife into the tissue results in its "jamming" therein.
Another electrosurgical instrument is known to comprise a cutting portion which incorporates an active electrode in the form of a disk cutter, and a power actuator to impart rotation to said cutter, a passive electrode, and current leads to feed a diathermic current to the active electrode (cf. USSR Inventor's Certificate No. 194,982 published 1967).
The instrument described above is suitable for surgery on hard osseocartilaginous tissues but cannot also be applied in the areas where vitally important organs are located, since this instrument, like the instrument described previously operates on the bipolar monoactive cutting principle.
DISCLOSURE OF THE INVENTION
The present invention has for its principal object to provide an electrosurgical instrument for surgery on hard osseocartilaginous tissues whose construction would preclude injury to vitally important organs in the course of surgery.
The object stated above is accomplished due to the fact that an electrosurgical instrument, comprising a cutting portion which incorporates an active electrode in the form of a disk cutter, and a power actuator for rotating said disk cutter, as well as current leads to supply a diathermic current to the instrument, according to the invention, is provided with an additional active electrode made as a disk cutter similar to the main disk cutter, and arranged coaxially and at a clearance with the main disk cutter, while the cutting edges of the disk cutters are in effect uniformly alternating toothed and toothless portions, and the toothed portions of one of the cutters are arranged staggerwise with respect to the toothless portions of the other disk cutter.
It is expedient that a number of holes be made in the disk cutters close to their cutting edges and be equispaced peripherally on said disk cutters.
An electrosurgical instrument provided in accordance with the present invention is for surgery on hard osseocartilaginous tissues, its application inflicting no injury upon the vitally important organs with r.f. currents since the instrument operates, according to the invention, on the principle of bipolar biactive electrosurgery to which is essential a local effect, that is, a possibility of an efficacious action on some tissue areas without danger to damage the adjacent ones.
BRIEF DESCRIPTION OF THE DRAWINGS
In what follo
REFERENCES:
patent: 336739 (1886-02-01), Parker
patent: 1334633 (1920-03-01), Pioche
patent: 2179250 (1939-11-01), D'Amato
patent: 4257301 (1981-03-01), Tuomaala
patent: 4436009 (1984-03-01), Ask
S. Ja. Doletsky et al., High Frequency Electrosurgery, 1980, Meditsina Publ., Moscow, pp. 48-55.
Citrin Randy
Howell Kyle L.
Nauchno-Issledovatelsky Institut Obschei i Neotlozhno Khirurgii
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