Electrical resistors – Resistance value responsive to a condition – Ambient temperature
Patent
1980-09-25
1983-05-03
Yasich, Daniel M.
Electrical resistors
Resistance value responsive to a condition
Ambient temperature
29612, 338 22R, 339176MF, 374185, G01K 114, H01C 114, H01C 310
Patent
active
043822460
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for measuring temperature, comprising a temperature-sensitive sensor, whose electric properties, for example, resistance, vary with the temperature, for example, a thermistor which is connected to electric lines which, in turn, may be connected to a read-off unit for reading off the values of current, voltage or the like corresponding to the temperature.
The apparatus according to the invention is primarily intended to be used for medicinal temperature measurement. Consequently, one aspect of the invention is to make the apparatus so simple and cheap that it may be disposed of after use, that is to say that it may not be reused.
At the same time however, it should be possible to manufacture the apparatus with such precision that the reader can rely with great certainty on the read-off values, this being, clearly, of the greatest importance precisely in medical use.
However, it is clear to a person skilled in the art that the apparatus according to the invention may be used in other contexts, for example, in pure industrial application in which a simple and inexpensive but nevertheless reliable reading-off of temperature is desired.
BACKGROUND ART
Swedish patent application No. 78.03046-7 (U.S. Ser. No. 779 152 filed Mar. 18, 1977, which is the parent of U.S. patent application Ser. No. 41,551, filed May 23, 1979, now U.S. Pat. No. 4,317,367) and the two copending PCT Applications PCT/SE78/00012 (U.S. patent application Ser. No. 131,079, filed July 3, 1978, now U.S. Pat. No. 4,269,633) and PCT/SE78/00013 (U.S. patent application Ser. No. 131,078, filed June 1, 1979, now U.S. Pat. No. 4,253,334) describe different embodiments of an apparatus similar to that according to the invention and how the apparatus according to the invention may be used. The concept forming the basis of the present invention is, in this instance, to realize such an apparatus, but of simpler type and adapted to a simpler manner of manufature.
In U.S. patent applications Ser. No. 787,422, filed Apr. 14, 1977, now U.S. Pat. No. 4,200,970 and Ser. No. 879,193, filed Feb. 21, 1978) there are described different trimming processes for apparatuses similar to that according to the invention. Such trimming processes could well be used for trimming the apparatus according to the invention. Preferably however, use is made instead of an assortment of the type described in co-filed application PCT/SE78/00012 (U.S. patent application Ser. No. 131,079, filed July 3, 1978, now U.S. Pat. No. 4,296,633).
DESCRIPTION OF THE INVENTION
The apparatus according to the invention is characterized in that the above-mentioned electric lines are disposed between two insulated layers which display mutually offset holes in register with each respective line, whereby these may easily be connected to different sensing terminals in the above-mentioned read-off unit.
The above-mentioned construction permits of a very simple manner of manufacture which will be described in greater detail below under the title "Preferred manner of manufacture".
Preferably, the two insulated layers consist of plastics-coated paper which may easily be thermally sealed to mutually contact each other and, respectively, to contact with other materials.
In order to increase the possibilities of rapid read-off, the two insulating layers present holes suitably located in register with each other and in register with the sensor. In order, in such an event, to prevent short-circuiting when the apparatus is used in wet or humid atmosphere, for example, in the mouth of a patient, the sensor and the hole in register therewith are covered by two insulating outer layers which do not, however, cover the mutually offset holes.
The sensor which is used may consist of two thermistors which are each connected by their first terminal to an intermediate line and are each connected by their second terminal to the above-mentioned electric line. As a result, the thermistors which are used need not be trimmed. Instead, it is possible, by select
REFERENCES:
patent: 2703833 (1955-03-01), Vanvor
patent: 2952761 (1960-09-01), Smith-Johannsen
patent: 3028756 (1962-04-01), Takagishi
patent: 3077511 (1963-02-01), Bohrer et al.
patent: 3109227 (1963-11-01), Goodyear
patent: 3189863 (1965-06-01), Leach
patent: 3393392 (1968-07-01), Shelley
patent: 3646494 (1972-02-01), Waseleski et al.
patent: 3673538 (1972-06-01), Faxon
patent: 3697925 (1972-10-01), Henschen
patent: 3750471 (1973-08-01), Bremer
patent: 3889362 (1975-06-01), Tyler
patent: 4251712 (1981-02-01), Parr
patent: 4302972 (1981-12-01), Oettle et al.
patent: 4317367 (1982-03-01), Schonberger
Hakansson Hakan B.
Hansson Ingvar J. M.
Igefjord Magnus G. K.
Wall Berth-Ove G.
Crafon Medical AB
Yasich Daniel M.
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