WO2001001094A1 - Fast response thermometer - Google Patents
Fast response thermometer Download PDFInfo
- Publication number
- WO2001001094A1 WO2001001094A1 PCT/IB2000/000931 IB0000931W WO0101094A1 WO 2001001094 A1 WO2001001094 A1 WO 2001001094A1 IB 0000931 W IB0000931 W IB 0000931W WO 0101094 A1 WO0101094 A1 WO 0101094A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thermometer
- temperature
- thermistor
- display
- probe
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/20—Clinical contact thermometers for use with humans or animals
Definitions
- thermometer completes the measurement in a few seconds but suffers from many problems. Problems are caused mostly by the misuse of the device by the user, such as a wrong positioning in the ear. Another problem is the influence of the thermometer probe as it is brought into contact with the ear.
- the long measurement time of contact digital thermometers is caused by two main factors.
- the first factor is the large thermal mass of the thermometer probe.
- the probe is typically a chrome coated aluminum tube or a stainless steel tube with a thermistor inside it.
- the thermistor is fixed within the probe by an epoxy glue with a low thermal conductivity.
- the second factor is a plastic housing to which the metal probe is typically connected.
- the plastic housing also has a large thermal mass that, upon contact, reduces the temperature of the measured area.
- this plastic housing presents an obstacle to the natural position of the tongue and thus prevents the forming of a homogenous environment around the measurement probe.
- thermometer has a measurement probe with a small thermal mass that can reach a stable measurement in a few seconds.
- the measurement probe is connected to the body of the thermometer with a flexible sleeve that also has a small thermal mass.
- the sleeve avoids a significant change in the temperature of the area being measured upon contact.
- the flexible connection between the thermometer sensor head and the plastic housing enables the tongue to maintain its natural position and to create a homogenous environment around the measurement probe.
- the thermometer preferably samples the temperature several times in a short measurement time to provide an accurate result.
- the thermometer preferably operates at a very low power consumption and is comparable in cost to a regular digital thermometer.
- Figure 1 A is an elevational view of the thermometer.
- Figure 1 B is a plan view of the thermometer.
- Figure 2 is a cross-sectional view of the thermometer probe and the flexible connection.
- Figure 3 is a graph of experimental data of temperature versus time for the thermometer.
- Figure 4 is a block diagram of the electronic components of the thermometer.
- Figure 5 illustrates a preferred method of calibrating the thermometer.
- FIGS IA and 1 B show the general structure of the thermometer 1 in accordance with the preferred embodiment.
- a thermistor 10 is connected to the plastic housing 7 by a flexible part or flexible probe 6.
- the thermistor 10 and the plastic housing 7 are installed as an "insert" in a silicone mold during the molding of the silicone part 6.
- the silicone creates a water resistant layer around the conductive wires of the thermistor all the way up to the plastic housing and protects the wires from a short circuit or a tear.
- the hardness of the silicone, around 30-40 shor is selected so that the silicone will be soft enough longitudinally so that it can be bent under the tongue. This allows the tongue to stay in its natural position and cover the thermistor in order to create a homogenous environment around it.
- the silicone part 6 should also be hard enough widthwise, so that a rectal measurement can be performed.
- the flexible silicone part 6 also serves as an insulator to thermally isolate the thermistor 10 from the plastic housing 7.
- the thermometer 1 preferably has a liquid crystal display (LCD) 14 upon which temperature is displayed either in degrees Fahrenheit or Celsius.
- the thermometer 1 preferably incorporates two momentary push buttons 15 and 16.
- the button 15 is used to turn the thermometer 1 on. When turned on, the thermometer 1 will perform an automatic measurement each time it senses temperature above 32.0°C (89.6°F). When ambient room temperature is above 32.0°C (89.6°F) the automatic measurement function is preferably disabled and manual operation is effected by pushing the button 15.
- the button 16 has two functions. While the thermometer 1 is on, the button 16 scrolls through four memories, which include the last four temperature measurements and the time these measurements were taken. While the thermometer 1 is off, the button 16 changes the display from Fahrenheit to Celsius and vice versa. Pushing the buttons 15 and 16 simultaneously will reset the thermometer 1.
- FIG. 2 illustrates a cross section of the tip and of the base of the thermometer probe 6 in accordance with a preferred embodiment of the present invention.
- the thermistor 10 is preferably very small.
- One applicable thermistor is a 23226339000A produced by Philips Netherlands, which includes a temperature sensitive resistor 3 that is connected to two long thin conductive wires 5.
- the resistor 3 and the wires are protected by a tiny molding of approximately 1 millimeter in diameter of a ceramic substance 2 with a good thermal conductivity.
- the stabilization time Tc of this thermistor is approximately 3 seconds.
- the thermistor 10 is preferably protected by a coating 4, approximately 10 ⁇ m thick, made of Chrome or Titanium, which can be applied during a process of vacuum coating or other electroless coating.
- Figure 3 shows an experimental stabilization graph of the thermistor temperature vs. time after the thermometer 1 is inserted into water bath with a temperature of 37.00°C (98.60°F).
- the graph shows that the thermometer 1 reaches stabilization after 6 to 7 seconds within an accuracy window of 0.05°F ( " 0.028°C).
- the thermometer 1 preferably checks the readings repeatedly for stability within the above tolerance for 1 second before it displays temperature and sounds an indicating beep.
- FIG 4 shows the electrical circuit that is used in the preferred embodiment of the thermometer 1.
- a microprocessor 41 such as an E0C60L05 produced by EPSON, Japan is used to measure the resistance of the thermistor 10, preferably through a resistance to frequency circuit, which is included in the microprocessor 41.
- the microprocessor 41 calculates the temperature based on the resistance of the thermistor 10 and displays the calculated temperature on the LCD 14.
- the microprocessor 41 preferably includes memory 43 for storing previously measured temperatures.
- the electrical circuit preferably has a low power consumption.
- Figure 5 illustrates a preferred method 500 of calibrating the thermometer.
- a thermometer bias is calculated at a first temperature.
- the bias is preferably calibrated by two resistors 44 ( Figure 4).
- thermometer slope is calibrated at a second temperature.
- the slope is preferably calibrated by a digital four-bit calibration 45, which is provided by four switches ( Figure 4).
- the two calibrations give an accuracy of 0.05°F (0.028°C) in the temperature range from 32.0° (89.6°F) to 42.6°C (108.7°F). This accuracy is four times better than the accuracy of a regular medical digital thermometer.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001506462A JP2003503694A (en) | 1999-06-23 | 2000-06-23 | Fast response thermometer |
EP00939005A EP1188037A1 (en) | 1999-06-23 | 2000-06-23 | Fast response thermometer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL130626 | 1999-06-23 | ||
IL13062699A IL130626A0 (en) | 1999-06-23 | 1999-06-23 | Fast response thermometer |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001001094A1 true WO2001001094A1 (en) | 2001-01-04 |
Family
ID=11072958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2000/000931 WO2001001094A1 (en) | 1999-06-23 | 2000-06-23 | Fast response thermometer |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1188037A1 (en) |
JP (1) | JP2003503694A (en) |
IL (1) | IL130626A0 (en) |
WO (1) | WO2001001094A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003044477A1 (en) * | 2001-11-20 | 2003-05-30 | Citizen Watch Co., Ltd. | Thermometer |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106092371B (en) * | 2016-06-06 | 2019-05-14 | 广州视源电子科技股份有限公司 | The method and device thereof of predicted temperature |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60259920A (en) * | 1984-06-06 | 1985-12-23 | Toshiba Glass Co Ltd | Clinical electronic thermometer |
US4771791A (en) * | 1986-02-25 | 1988-09-20 | Benytone Corporation | Apparatus for storing and displaying body temperature |
-
1999
- 1999-06-23 IL IL13062699A patent/IL130626A0/en unknown
-
2000
- 2000-06-23 WO PCT/IB2000/000931 patent/WO2001001094A1/en not_active Application Discontinuation
- 2000-06-23 EP EP00939005A patent/EP1188037A1/en not_active Withdrawn
- 2000-06-23 JP JP2001506462A patent/JP2003503694A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60259920A (en) * | 1984-06-06 | 1985-12-23 | Toshiba Glass Co Ltd | Clinical electronic thermometer |
US4771791A (en) * | 1986-02-25 | 1988-09-20 | Benytone Corporation | Apparatus for storing and displaying body temperature |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 010, no. 140 (P - 458) 23 May 1986 (1986-05-23) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003044477A1 (en) * | 2001-11-20 | 2003-05-30 | Citizen Watch Co., Ltd. | Thermometer |
CN100442033C (en) * | 2001-11-20 | 2008-12-10 | 西铁城控股株式会社 | Thermometer |
Also Published As
Publication number | Publication date |
---|---|
EP1188037A1 (en) | 2002-03-20 |
JP2003503694A (en) | 2003-01-28 |
IL130626A0 (en) | 2000-06-01 |
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