Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1987-10-01
1989-06-06
Scott, Jr., Leon
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
128664, 128665, A61B 1736
Patent
active
048362034
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for therapeutically irradiating organic tissue with easer radiation.
BACKGROUND OF THE INVENTION
Such devices have become known as so-called mid or soft lasers. They are utilized for the treatment in various areas such as in rheumatology, dermatology, neurology or in dental medicine. The treatment with laser rays is painless and causes either a warming nor a macrochemical change of the tissue. The laser radiation acts in a stimulating manner on the cell activity and activates therewith the body's own healing powers; it acts above of all antiphlogistically, antiedematous and pain relieving and is also free of any side effects.
A mid-laser is known which contains an HeNe-laser and emits a radiation having a wavelength of 633 nm. This radiation is conducted via flexible glass fibers to the location where irradiation is to occur. With this, the original polarized laser radiation is depolarized. Such lasers are preferably utilized for treating wounds.
In addition, mid-lasers are known which in addition comprise a second laser which emits a radiation of a wavelength of 904 nm. Here the rays are conducted directly to the location of the irradiation, that is, without optical elements being interposed. Because of this, such a device is most difficult to manipulate.
With these known mid-lasers, the laser beam is directed across the irradiation field in the form of a scanning raster. This has the disadvantage that the power density over this field is distributed unevenly since the power density at and near the reversal point is higher than in the regions lying therebetween.
With the known mid-lasers having a laser emitting at 904 nm, this laser is pulsed with the pulse frequency being adjustable and reaching up to approximately 5 kHz in the upper range. The semiconductor diodes utilized deliver only a low power in the timed average value which generally is at approximately 5 mW and therebelow.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a device for therapeutic irradiation of organic tissue such that an improved therapeutic effectiveness is obtained at a low cost compared to known devices.
In the device according to the invention, the laser operating in the near infrared range emits radiation in the wavelength range of 800 to 870 nm, preferably at 840 nm. This radiation is supplied during continuous operation and widened to a desired diameter at the location of the irradiation by means of an optical system.
In this way, an irradiation field of adjustable magnitude is charged with an evenly distributed power density with the laser delivering a capacity of approximately 100 mW as a mean value per unit of time, the laser being advantageously configured as a GaAs-semiconductor diode.
A significant improvement of the therapeutic effect is obtained by means of the selection of the wavelength and the continuous irradiation of the laser beam. With cell metabolism of organic cells, an enzyme (from the group of flavo proteins) occurs whose absorption capacity is at the highest for a short time for a time of <10.sup.-3 s at approximately 840 nm. This enzyme absorbs photons out of the impinging laser beam and these enzymes effect among other things a charge carrier exchange. In this way, the cell membranes become polarized and thereby stimulate the cell metabolism. In this way, the body's own healing powers are activated.
The continuous irradiation of the laser beam provides that a definite number of photons per surface unit and per time unit are available at each location of the irradiated field. In this way, an adequate number of photons are made available in the wavelength range which is optimal for absorption at every occurrence of the above-mentioned absorption condition of the enzyme which exists for a short time, so that a stimulation of the cellular exchange can occur. Since the power density of irradiation is distributed evenly over the irradiated field, the stimulating effects occur across this field in unifom distributi
REFERENCES:
patent: 4290433 (1981-09-01), Alfano
patent: 4309998 (1982-01-01), Rosa et al.
patent: 4336809 (1982-06-01), Clark
Greve Peter
Muller Gerhard
Carl-Zeiss-Stiftung
Jr. Leon Scott
Ottesen Walter
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