Surgery – Truss – Pad
Patent
1988-11-02
1990-08-07
Cohen, Lee S.
Surgery
Truss
Pad
A61N 134
Patent
active
049459104
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to medical engineering and more specifically to a device for electroanalgesia of patients' tissues.
PRIOR ART
At present both medicamental and physical methods of dental anesthesia are used for preparing dental tissues. Since medicamental methods may inflict allergic reactions upon patients, it is physical methods that are most promising in this field, which are based on the use of direct electric current which when passed through the dental tissues to be prepared causes a local anesthetic effect. However, when flowing through the dental tissues direct electric current causes polarization of these tissues, resulting in a loss of the anesthetic effect. Restoration of this effect is attained by virture of depolarization of the dental tissues which is effected by a transient passing of electric current in the reverse direction. Further development of electroanalgesia equipment based on the use of electric current is aimed at increasing the anesthetic effect.
One state-of-the-art electroanalgesia apparatus for preparing hard dental tissues is known to comprise series-connected a direct current regulator, a direct current stabilizer and a direct current polarity reversal switch made as a toggle switch, as well as electrodes for connection directly to patient's body and to a means exerting therapeutic effect upon the patient and to the direct current polarity reversal switch, one of said electrode being essentially a clip fitted on, e.g., the lobule of the patient's ear, while the other is in fact a clamp fixed in the handpiece of a dental engine.
To effect electroanalgesia of the hard dental tissues during their preparation the direct current polarity reversal switch is set by the surgeon to a position, wherein a negative potential is applied to the chip-electrode, while a positive potential is impressed upon the other electrode. Upon closing an electric circuit of the electrodes through the hard dental tissues an anesthetic effect is observed, accompanied also by polarization of the tissues involoved. The tissue polarization process affects adversely the anesthetic effect and results in painful sensations felt by the patient. Patient's response to arising pain serves as a signal to the surgeon to cease tooth preparation, reverse the polarity toggle switch and the following transient closing of the electrodes without tooth preparing so as to depolarize the hard dental tissues. After depolarization the surgeon sets the polarity toggle switch to effect electroanalgesia and resumes the tooth preparation procedure.
It ensures from the foregoing discussion that despite the polarizatin of the hard dental tissues the local anesthesia apparatus mentioned above fails to eliminate completely the painful sensations felt by the patient and caused by polarization of the hard dental tissues, since depolarization is carried out in said apparatus by the surgeon just against the patient's painful sensation.
One more prior-art device for electroanalgesia of patients' tissues is known to comprise series-connected generator of asymmetric pulses wherein some of its pulses at the generator output have greater duration to provide electroanalgesia of patient's tissues accompanied by their polarization, while other pulses have shorter duration so to depolarize the patient's tissues, a current regulator and a current stabilizer to which are connected electrodes for a direct connection to the patient and to a means exerting an analgesic effect upon the patient.
In the device discussed above operation of the generator of asymmetric pulses occurs no matter whether the electric circuit of the electrodes closes through the patient's tissues or not. That is why the starting of the pulse generator produced upon closing the electric circuit of the electrodes may have any polarity.
The device described above is employed for treatment of patients tending to drug addiction, as well as of those suffering from asthma, insomnia, and facial paralysis. Besides, the device is applicable for the purpose of analge
REFERENCES:
patent: 3955583 (1976-05-01), Horauf
patent: 4301794 (1981-11-01), Tapper
patent: 4372319 (1983-02-01), Ichinomiya et al.
Budyko Viktor A.
Ivanchenko Andrei F.
Konovalenko Vladimir V.
Krokhmal Vladimir M.
Kutsov Valentin D.
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