Illumination – Supported by vehicle structure – Condition responsive
Patent
1990-04-18
1991-01-22
Gonzalez, Frank
Illumination
Supported by vehicle structure
Condition responsive
350 9610, 350 9615, 350 9620, 362 32, G02B 616
Patent
active
049866281
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to light guide devices for the transmission of a radiation energy, and in particular, it deals with light guide devices for phototherapy.
BACKGROUND ART
Known in the art is a light guide device for phototherapy comprising an optical fiber light guide and a light cattering member in the form of a bare light guiding strand of the light guide the periphery of which is treated with hydrofluoric acid (Optics and Laser Technology. 1984, February. H. Fujii et al. "Light Scattering Properties of a Rough-Ended Optical Fiber", pp. 40, 41).
This device cannot be used for carrying out intracavitary laser treatment procedures because of high danger: the light scattering member is in the form of a brittle member which is very likely to be broken in the patient body.
Known in the art is a light guide device for phototherapy comprising an optical fiber light guide having a light guiding strand, light reflecting and protective envelopes and a light scattering member provided at the distal end of the optical fiber light guide (Laser in Surgery and Medicine, No. 6, 1986. M. Arnfield et al. "Cylindrical Irradiator Fiber Tip for Photodynamic Therapy. p. 151).
In this light guide device for phototherapy, the light scattering member is in the form of a sleeve having end faces of its walls cemented to a bare portion of a light guiding strand of the optical fiber light guide, a layer of epoxy resin being applied to the inner surface of the sleeve walls.
This device cannot ensure safety of a patient in carrying out intracavitary laser treatment procedures, i.e. it is dangerous and may cause injury.
This device is also complicated in the manufacture. Moreover, this device can only ensure one type of the indicatrix of light distribution of the radiation, i.e. it cannot ensure matching of the shape of indicatrix of light distribution of the radiation to the shape of a pathological focus so as to optimize the effect of the therapy factor.
DISCLOSURE OF THE INVENTION
The invention is based on the problem of providing a light guide device for phototherapy in which a protective envelope of an optical fiber light guide in combination with a light scattering member are made in such a manner at to ensure absolute guarantee against injury of a patient and to optimize the effect of the therapy factor by matching the shape of indicatrix of light distribution of the radiation to the shape of a pathological focus while ensuring a simple design of the light guide device.
This is accomplished by that in a light guide device for phototherapy comprising an optical fiber light guide having a light guiding strand a light reflecting envelope and a protective envelope, and a light scattering member provided at a digital end of the optical fiber light guide, according to the invention, the protective envelope of the optical fiber light protrudes beyond the end face of the dictal end of the optical fiber light guide and defines a closed space therewith, and the light scattering member is made of an optically turbid medium which is in contact with the end face of the optical fiber light guide and which fills up the entire closed space.
This structural embodiment of the light guide device for phototherapy makes it possible to completely avoid injuries of a patient in carrying out intracavitary laser treatment procedures, i.e. it makes it possible to achieve high reliability in operation and to optimize the effect of the therapy factor with a simple design of the device.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to specific embodiments illustrated in the accompanying drawings, in which:
FIG. 1 is a longitudinal section view of a light guide device for phototherapy according to the invention;
FIG. 2 shows indicatrixes of light distribution of the radiation in the form of ellipsoids and a sphere obtained with the aid of a light guide device of FIG. 1;
FIG. 3 is indicatrix of light distribution in the form of a torus obtained with the aid of the light guide device of FIG.
REFERENCES:
patent: 4516022 (1985-05-01), Lindgren
patent: 4639078 (1987-01-01), Sheem
patent: 4740047 (1988-04-01), Abe et al.
patent: 4801187 (1989-01-01), Elbert et al.
patent: 4822123 (1989-04-01), Mori
patent: 4895420 (1990-01-01), Waymouth
Lozhenko Alexandr S.
Rechitsky Vladimir I.
Shendalev Viktor N.
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