Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Thermal applicators
Patent
1993-03-15
1994-10-11
Cohen, Lee S.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Thermal applicators
607102, 607154, A61N 500
Patent
active
053543254
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a system for the internal heat treatment of a specific body and to the use of this system.
The internal heat treatment appliances are normally used either in industrial processes or, according to a novel trend, in methods of therapeutic treatment by hyperthermia.
In the two abovementioned cases, an essential element of these types of appliances is precision as much in the temperature as in the field of application, with respect to the area to be treated, of the hyperthermia generated.
When such operational modes are employed, especially with a view to heat treatment of a specific body, such as the human body for example, a method consists in introducing, into a natural cavity of the latter, an element for emitting and/or concentrating energy, such as microwave electromagnetic energy, the dissipative nature of the walls of this cavity, seats of a resultant electric field being then subjected to a corresponding rise in temperature.
Such an operational mode, although capable of giving satisfaction, does not make it possible to establish with sufficient precision the temperature effectively reached by the area to be treated, or the region of the specific body and hence of the area to be treated in this region subjected to the hyperthermia generated, except by providing one or more temperature sensors arranged in the vicinity of the abovementioned area.
In the case where the specific body subjected to the treatment is the human body, it goes without saying that the use of a natural cavity so as to carry out implantation of abovementioned temperature sensors may be envisaged. But such an operating mode then exhibits the drawback of occupying the corresponding natural cavity, which practically prohibits the use of the latter for the implantation of a source or of a concentrator element for hyperthermia-generating energy. In such a case, the closely spaced nature of two adjacent natural cavities cannot be used to bring about, for example, treatment by hyperthermia of an area to be treated which is situated between the latter.
Furthermore, it will be noted that the use of temperature sensors placed in the vicinity of the electromagnetic energy source element generating the hyperthermia may be inimical to the operation of these sensors, especially by reason of the fact that the active semiconductor elements of the latter are capable of being subjected, in the course of operation, to an intense electric field.
The object of the present invention is to remedy the series of abovementioned drawbacks by implementing a system for the internal heat treatment of specific bodies, by application of microwave energy, making it possible to obtain satisfactory precision as much in the temperature reached as in the region in which the hyperthermia is generated.
Another object of the present invention is the implementation of the system for the internal heat treatment of specific bodies, by application of microwave energy, in which one or more microwave energy applicators are provided, this or these applicators being, in addition to their applicator function, intended to play the role of temperature sensor in the temporary absence of microwave energy application, which makes it possible to take a measurement of the instantaneous temperature at separate points in the vicinity of the area to be treated, these points corresponding exactly to the points of application of the microwave energy in the vicinity of the area to be treated.
Another subject of the present invention finally is the implementation of a system for the internal heat treatment of specific bodies, by application of microwave energy, this system, by virtue of a large dynamic range of level of power radiated in the vicinity of the area to be treated, exhibiting great flexibility in use for very varied applications.
The system for the internal heat treatment of specific bodies by application of microwave energy, which is the subject of the present invention, is noteworthy in that it comprises a generator of microwave energy at a defined frequen
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Mendecki et al. "Microwave Applicators For Localized Hyperthermia Treatment of Cancer of the Prostate" Int. J. Radiation Oncology Biol. Phys. vol. 6, No. 11 pp. 1583-1585, Nov. 1980.
Database WPIL, Week 8819, Derwent Publ. Ltd., London GB; AN 88-132135 & SU,A, 1,345,142 (Ioselson) Oct. 15, 1987 -see abstract.
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Chive Maurice
Moschetto Yves
Sozanski Jean-Pierre
Vanloot Daniel
Cohen Lee S.
Institut National de la Sante et de la Recherche Medicale
Nasser Jr. Robert L.
Universite des Sciences et Technologies de Lille
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