WO2005026683A1 - リークテスタ - Google Patents
リークテスタ Download PDFInfo
- Publication number
- WO2005026683A1 WO2005026683A1 PCT/JP2004/013025 JP2004013025W WO2005026683A1 WO 2005026683 A1 WO2005026683 A1 WO 2005026683A1 JP 2004013025 W JP2004013025 W JP 2004013025W WO 2005026683 A1 WO2005026683 A1 WO 2005026683A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- leak
- endoscope
- measured
- leak tester
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2846—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00002—Operational features of endoscopes
- A61B1/00057—Operational features of endoscopes provided with means for testing or calibration
Definitions
- the present invention relates to a leak tester for detecting leaks of an airtight article, for example, an endoscope.
- Japanese Patent Application Laid-Open No. Hei 4 221733 and Japanese Patent No. 3186438 disclose a method of measuring the pressure of a gas in an object to be measured and a pressurized gas source using a differential pressure sensor. There is disclosed a technique for determining the presence or absence of a leak by detecting a pressure difference from the pressure of a supplied pressurized gas. Further, as a simpler leak test method, Japanese Patent Application Laid-Open No. 5-220110 discloses a method of detecting the internal pressure of an endoscope with a gauge pressure sensor.
- the present invention has been made in view of the above circumstances, and has as its object to provide a leak tester that is inexpensive, small, and capable of automatically and accurately determining a leak of an object to be measured.
- a leak tester of the present invention includes a pressurizing means for pressurizing an object to be measured by introducing a gas, a pressure detecting means for measuring a pressure in the object to be measured, and a pressure detecting means using the pressurizing means.
- Volume estimating means for supplying a certain amount of gas or a certain amount of gas into the object to stop the pressurization, estimating the volume of the object to be measured from the pressure detected at the time of stopping the pressurization, and After estimating the volume of the object to be measured by the estimating means, the pressure in the object to be measured after the elapse of a predetermined time is detected by the pressure detecting means, and the volume of the object to be measured and the elapse of the predetermined time Leak determination means for determining a leak state of the measured object based on a later pressure in the measured object.
- FIG. 1 is a block diagram showing a basic configuration of a leak tester.
- FIG. 2 is a time chart for explaining the operation of the air pump and the on-off valve throughout.
- FIG. 3 is a transition diagram of an output of a pressure sensor when the endoscope is pressurized.
- FIG. 4 is a time chart for explaining the operation of the air pump and the on-off valve at the time of volume measurement when the leak on the leak tester side can be ignored.
- FIG. 5 is a transition diagram of pressure sensor output during volume measurement.
- FIG. 6 is a time chart for explaining the operation of the air pump and the on-off valve at the time of volume measurement when the leak on the leak tester side cannot be ignored.
- FIG. 7 is a schematic configuration diagram of an air pump.
- FIG. 8 is an explanatory diagram of a pressure transition according to a difference in pressurization time of an endoscope without a leak.
- FIG. 9 is an explanatory diagram of input / output characteristics of a general gauge pressure sensor.
- FIG. 10 is a conceptual diagram of a signal amplification circuit.
- FIG. 11 is an explanatory diagram of a signal amplification method in a signal amplification region.
- FIG. 12 is a diagram showing how to determine VI in FIG. 10 and R1 and R2.
- FIG. 13 is an explanatory diagram of an example of an area for determining the presence or absence of a leak.
- FIG. 14 is an explanatory diagram of an example of an area for determining the presence / absence of a leak different from FIG.
- FIG. 15 is an explanatory diagram of an example of an area for judging the presence / absence of a leak which is different from FIG. 13 and FIG.
- FIG. 16 is an explanatory diagram of an example of an area for judging the presence or absence of a leak, which is different from FIG. 13, FIG. 14, and FIG.
- FIG. 17 is an explanatory diagram of an example of an area for judging the presence / absence of leak, which is different from FIG. 13, FIG. 14, FIG. 15, and FIG.
- FIG. 18 is an external view of a leak tester for an endoscope.
- FIG. 19 is an overall block diagram of FIG. 18.
- FIG. 1 to FIG. 18 show an embodiment of the present invention.
- FIG. 1 is a block diagram showing a basic configuration of a leak tester.
- FIG. 2 is a time chart for explaining the operation of the air pump and the on-off valve throughout.
- FIG. 3 is a transition diagram of the pressure sensor output when the endoscope is pressurized.
- FIG. 4 is a time chart for explaining the operation of the air pump and the on-off valve at the time of volume measurement when the leak on the leak tester side can be ignored.
- FIG. 5 is a transition diagram of the pressure sensor output at the time of volume measurement.
- FIG. 6 is a time chart for explaining the operation of the air pump and the on-off valve at the time of capacity measurement when the leak on the leak tester side cannot be ignored.
- FIG. 1 is a block diagram showing a basic configuration of a leak tester.
- FIG. 2 is a time chart for explaining the operation of the air pump and the on-off valve throughout.
- FIG. 3 is a transition diagram of the pressure sensor
- FIG. 7 is a schematic configuration diagram of an air pump.
- FIG. 8 is an explanatory diagram of a pressure transition according to a difference in pressurization time of an endoscope without a leak.
- FIG. 9 is an explanatory diagram of input / output characteristics of a general gauge pressure sensor.
- FIG. 10 is a conceptual diagram of a signal amplifier circuit.
- FIG. 11 is an explanatory diagram of a signal amplification method in a signal amplification region.
- FIG. 12 shows VI and R1 and R in FIG. It is a figure showing how to determine 2.
- FIG. 13 is an explanatory diagram of an example of an area for determining the presence or absence of a leak.
- FIG. 13 is an explanatory diagram of an example of an area for determining the presence or absence of a leak.
- FIG. 14 is an explanatory diagram of an example of a region for determining the presence or absence of a leak different from that in FIG.
- FIG. 15 is an explanatory diagram of an example of an area for judging the presence / absence of leakage, which is different from FIGS. 13 and 14.
- FIG. 16 is an explanatory diagram of an example of a region for judging the presence or absence of a leak, which is different from those in FIGS. 13, 14, and 15.
- FIG. 17 is an explanatory diagram of an example of an area for judging the presence / absence of leakage, which is different from FIGS. 13, 14, 15, and 16.
- FIG. 18 is an external view of a leak tester for an endoscope.
- FIG. 19 is an overall block diagram of FIG.
- reference numeral 1 denotes a leak tester
- the leak tester 1 includes an air pump 11, pipes 12, 13, on-off valves 14, 15, a relief valve 16, a gauge pressure sensor 17, and a control unit 20. It is mainly composed.
- the air pump 11 is, for example, a diaphragm type air pump, serving as a pressurizing unit, and is connected to the on-off valve 15 via a pipe 12. Further, a pipe 13 is connected to the on-off valve 15.
- the piping 12 is connected to an on-off valve 14 and a relief valve 16, one of which is open to the atmosphere.
- the pipe 13 is connected to the endoscope 2 as an object to be measured, and further connected to a gauge pressure sensor 17 as pressure detecting means for measuring the pressure in the endoscope 2.
- control unit 20 has functions as a volume estimating unit and a leak determining unit, and controls the air pump 11 and the on-off valves 14 and 15 according to the time chart shown in FIG.
- a step of pressurizing the inside of the endoscope 2 which is an object to be measured starts.
- the control unit 20 opens the on-off valve 15, closes the on-off valve 14, and drives the air pump 11.
- the pressurized pressure rises to a certain pressure determined by the relief valve 16.
- the control unit 20 closes the on-off valve 15 and shifts to the balance process.
- the no-lance step is a step for the purpose of increasing the time until the pressure distribution inside the endoscope 2 and inside the pipe 13 becomes uniform.
- the operating states of the air pump 11 and the on-off valve 14 may be arbitrary, but the air pump 11 is preferably stopped.
- the process proceeds to the measurement process. There is no change in the state of the on-off valve at the time of transition from the Norance process force to the measurement process.
- control unit 20 monitors the output value of gauge pressure sensor 17. The details of this monitoring will be described later. After the completion of the measurement process, the process shifts to an exhaust process for removing air from the endoscope 2.
- control unit 20 opens the on-off valves 14 and 15, stops the air pump 11, and discharges the pressurized air inside the endoscope 2 to the atmosphere.
- the measurement operation ends when the evacuation process ends.
- the pressure change in the container depends on the volume of the container. If the volume is small, the pressure drop per time will be large.
- One purpose of the present application is to prevent a failure of an endoscope, so that a leak tester with higher precision can be realized by detecting a hole of a certain size, that is, a leak of a certain amount or more.
- the volume of the endoscope can be estimated based on how the pressure rises.
- the endoscope is long and thin, and various components are disposed inside. It is a complicated device.
- the connection port for pressurizing the inside of the endoscope is located at the end of the endoscope. For this reason, the configuration of the leak tester 1 shown in FIG. 1 is such that a pressure sensor and a pressurizing pump are connected to the end of a long, thin and air-resistant pipe.
- the output of the gauge pressure sensor 17 is non-linear as shown in FIG. 3, for example.
- This phenomenon peculiar to the endoscope 2 also complicates the estimation of the volume of the pressure rising force seen by the gauge pressure sensor 17. Therefore, in the transient state of the rise of pressurization, pressurization is temporarily stopped, and after the pressure in the endoscope 2 and the pipe 13 including the gauge pressure sensor 17 become substantially uniform, the gauge By measuring the pressure with the pressure sensor 17, the volume of the object to be measured, including the endoscope 2, is estimated.
- the control unit 20 performs an operation as shown in FIG. That is, after the start of pressurization, pressurization is performed for the time TA, and then the air pump 11 is stopped for the time TB.
- the output of the gauge pressure sensor 17 at that time makes a transition as shown in FIG.
- the value when the pressure becomes substantially constant during the time TB is stored as the volume data of the endoscope 2, and after the time of TB, the air pump 11 is driven again to resume pressurization.
- the control unit 20 implements the measurement by closing the on-off valve 15.
- the control unit 20 performs an operation as shown in FIG. That is, after pressurizing for TA, the on-off valve 15 is closed for TB. During this TB time, the operating conditions of the air pump 11 and the on-off valve 14 may be arbitrary. Then, after a lapse of time TB, the on-off valve 15 is opened to resume pressurization.
- the TA time may be any time as long as it satisfies the condition that the amount of air introduced into the endoscope 2 becomes constant. The easiest is to set a fixed time. However, considering the characteristics of the air pump 11 and the system, that is, the deterioration of the motor of the air pump 11, the fluctuation of the power supply voltage, and the like, the pump head rotation speed may be a constant rotation speed.
- the air pump 11 when the air pump 11 is of a diaphragm type, the amount of atmospheric air sucked by the pump, that is, the amount of air pumped out is determined by the number of reciprocations of the piston of the diaphragm pump head. Therefore, the rotation of the motor driving the pump head is counted, After constant rotation, stop pressurization.
- the air pump 11 is configured by attaching a pulse generator 33 to a motor 32 that drives a pump head 31. Then, the control unit 20 also counts the output pulse of the pulse generator 33 for the pressurization start force, and stops the air pump 11 when the count value reaches a constant value.
- the time of TB may be a fixed time. The time varies depending on the type of the endoscope 2, that is, its size and length, but even with the experimental force, even if the endoscope 2 has a large volume, stopping it for about 1.5 to 2 seconds will affect the measurement results. It has been found that the pressure is stable to a lesser extent.
- the control unit 20 reads the output of the gauge pressure sensor 17 and stores it as volume data of the endoscope 2 which is the object to be measured.
- the pressurizing time in the pressurizing step will be described.
- the endoscope 2 since the endoscope 2 has an air resistance inside the long and narrow area, if the pressure is immediately stopped by reaching the pressure by the relief valve 16 as viewed from the gauge pressure sensor 17, the endoscope without any leak is observed. Even with the mirror 2, a pressure drop occurs because the internal pressure tends to be constant. This phenomenon is a phenomenon that must be avoided because it is not possible to judge whether the pressure drops due to the pressure drop force during measurement or the force due to insufficient pressurization.
- FIG. 8 is an explanatory diagram of pressure transfer according to the difference in pressurization time of the endoscope without a leak in FIG. 8, where the stop is at point A and the stop at point B is C.
- the endoscope 2 is uniformly pressurized to every corner, so that the pressure drop due to the above-mentioned phenomenon is less likely to occur.
- the gauge pressure method In the case of using the gauge pressure method, a change in sensor output due to a decrease in pressure is reduced. Therefore, the influence of the power supply voltage fluctuation of the sensing circuit, the offset error of the sensor, the temperature characteristic, and the like cannot be ignored.
- the characteristics are as shown in FIG. 9, but even if it moves up, down, left, and right, the inclination itself is stable ( (Typically about ⁇ 1%). Therefore, if an arbitrary time force during the balance process and the gauge pressure output value at the start of the measurement are set as the initial values, and the pressure drop value is determined only from the change amount per unit time, the slope can be stabilized. Therefore, the effect of the vertical offset can be ignored.
- the control unit 20 generally converts the sensor output into a digital signal by an AD converter. However, by inputting the reference voltage Vref of the AD converter and the power supply of the sensor, the sensor output is changed due to voltage fluctuation. Even if the voltage fluctuates, the reference voltage of the AD converter also fluctuates at the same time, so that the obtained digital value is stabilized, so that the voltage fluctuation can be ignored.
- the power supply Vcc of the gauge pressure sensor 17 is input to the reference voltage Vref of the AD converter 42, and is connected so that the power supply fluctuation can be ignored.
- the output (voltage output type) of the gauge pressure sensor 17 is processed by an analog signal using an amplifier circuit centered on an OP amplifier 41, and the output is input to an AD converter 42.
- An amplifier circuit centered on the OP amplifier 41 has a very simple configuration, and performs signal conversion represented by the following equation.
- Vout (R2 (Vin-Vl)) / Rl
- Vin is the output of the gauge pressure sensor 17
- Vout is the output of the amplifier circuit
- VI is a reference voltage that can be adjusted and fixed by a trimmer, and each unit is volt (V).
- FIG. 11 is a conceptual diagram of what is performed in the circuit of FIG. That is, the inside of the endoscope 2 is normally pressurized to the pressure of the relief valve 16 by pressurization, and after the shutoff of the on-off valve 15, if there is a leak, the pressure is also reduced. If the pressure drop is enlarged and input to the AD converter, the above-mentioned error in digital conversion can be absorbed. Therefore, as shown in Fig. 11, only the pressure range to be measured is converted with the full scale of the AD converter.
- a reference value for judging the presence or absence of a leak is separately determined, but an area (a thick line area in the left figure) in which a margin is taken into account in the vertical direction with respect to the pressure drop at the time of the reference leak is determined. If you enlarge it and input it to the AD converter.
- the gauge pressure sensor is 0.5 kg / cm 2 full scale
- the area corresponding to 30% of the full scale will be subjected to the full scale conversion of the AD converter.
- the same effect can be obtained as if an AD converter with a resolution obtained by adding approximately 3.3 bits to the AD converter used was used.
- the output of the gauge pressure sensor with an amplifier is often provided with an offset (approximately 0.5 V) above and below 0-Vcc, the resolution is further improved in this case.
- an approximate 8-bit AD converter can be converted to 12-bit equivalent.
- the amount of leak depends on the size of the hole, a certain amount of leak is preferably used as a criterion.
- the pressure change is simply proportional to lZV (V: volume).
- V volume
- the data is based on the volume measurement described above, if the pressure rise value is volume data, it is proportional to 1 / V (V: volume). Therefore, the relationship between the volume measurement data and the pressure drop data due to the leak is a proportional relationship.
- the solid line in FIG. 14 may be used as a criterion.
- the reference leak rate to 11 lOml / min, and to set the Vol point in Fig. 14 when the volume is 400-800 ml.
- the applied pressure is in the range of 0.2-0.5 kg / cm 2 .
- criterion for determining the presence or absence of a leak is, for example, 10 ml
- a certain pressure drop can be used as the criterion as shown in FIG.
- an uncertain area may be provided as shown in FIG.
- the determination criterion for the leaked area Z uncertainty area is set to 4 ml / min
- the determination criterion for the uncertainty area Z no leaking area is set to 2 ml / min.
- an uncertain area may be set as shown in FIG. 17, for example. That is, the uncertainty area may be set between the upper part of the non-leak area and the leak area when the volume data is relatively large.
- FIG. 18 is an external view of a leak tester for an endoscope.
- the main body 51 includes a power switch 52, a stop switch 53, a start switch 54, an air supply switch 55, a display unit 56, and a scope connector 57.
- the endoscope leak tester is mainly configured based on the configuration shown in FIG. 1 described above.
- reference numeral 58 denotes an air filter, which is disposed downstream of the discharge port of the air pump 11 for the purpose of dust prevention.
- the control unit 20 includes a gauge pressure sensor 17 based on FIG.
- AD converter 42 that is, part of the pressure detection means
- the output of the gauge pressure sensor 17 is directly input to another input port of the AD converter 42.
- one gauge pressure sensor 17 can detect both the volume measurement and the pressure drop due to the leak.
- the AD converter 42 is connected to a control unit 58 in the control unit 20. Further, the control unit 20 is connected to a display unit 56 and switches 52-55. Furthermore, a leak connector 101 connected to the internal space of the endoscope 2 is connected to the scope connection connector 57.
- the air supply switch 55 is used to carry out a leak test of a system that is normally performed and submerged in water to visually check bubbles when the determination result has a mark or is uncertain. Is provided.
- the pressurized pressure may be the pressure determined by the relief valve 16. If the pressurized pressure is desired to be lower than that, the output of the gauge pressure sensor 17 is read into the CHO of the AD converter 42 and read to obtain an arbitrary pressure.
- the motor 32 for driving the pump head 31 of the air pump 11 may be operated. This makes it possible to confirm the leak again, and it is also possible to use the present leak tester for an object other than the endoscope 2 that performs a leak check by visual confirmation of bubbles.
- the above-mentioned volume measurement is performed.
- the output of the gauge pressure sensor 17 is captured by the CHO of the AD converter 42. If the pressurization is not performed, stop the operation because the endoscope 2 may have a large leak force or a failure inside the leak tester (such as disconnection of the pipe or the pump does not operate). Then, a warning is displayed.
- the pressurization is continued for a while, and the process proceeds to the next step, for example, after 40 to 90 seconds from the start of pressurization.
- the volume data of the endoscope 2 is obtained as described above.
- the pressure in the endoscope 2 is also monitored to confirm whether or not there is a sudden pressure drop due to a relatively large leak. This confirmation is performed by monitoring either or both of the value of CHO to which the output of the gauge pressure sensor 17 is input as it is and the value of CH1 via the amplifier circuit.
- the output data CH1 of the gauge pressure sensor 17 via the amplifier circuit is monitored. Since the pressure change in the endoscope 2 does not change linearly, measurement is performed for a certain period of time, and the average value of the force is determined as the pressure drop value. From this result and the volume data obtained in the pressurization step, the result is determined according to the above-mentioned determination criteria. After the measurement of the leak determination, the process proceeds to the next step.
- the criterion for determining the presence or absence of a leak in the norance process is to detect a relatively large hole, while the criterion after a predetermined time in this measurement process is to detect a small hole. . Therefore, it is possible to determine a hole between a relatively large hole and a small hole (a medium hole for convenience) more quickly. That is, the pressure drop value per unit time when determining the medium hole is determined in advance. Specifically small Perforated reference pressure force A simple method is to determine the pressure drop per unit time and add an arbitrary number to it and use that as the medium criterion for perforation (per unit time). If there is a larger drop than the reference pressure drop per unit time, it is determined that there is a leak at that stage, and the process proceeds to the next step.
- the operation After exhausting for a predetermined time, the operation returns to the standby state.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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AU2004272864A AU2004272864B2 (en) | 2003-09-12 | 2004-09-08 | Leak tester |
EP04787708A EP1666864A4 (en) | 2003-09-12 | 2004-09-08 | LEAK TESTER |
US11/369,569 US7353692B2 (en) | 2003-09-12 | 2006-03-07 | Leakage tester |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003322131A JP2005091042A (ja) | 2003-09-12 | 2003-09-12 | リークテスタ |
JP2003-322131 | 2003-09-12 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/369,569 Continuation US7353692B2 (en) | 2003-09-12 | 2006-03-07 | Leakage tester |
Publications (1)
Publication Number | Publication Date |
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WO2005026683A1 true WO2005026683A1 (ja) | 2005-03-24 |
Family
ID=34308665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/013025 WO2005026683A1 (ja) | 2003-09-12 | 2004-09-08 | リークテスタ |
Country Status (7)
Country | Link |
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US (1) | US7353692B2 (ja) |
EP (1) | EP1666864A4 (ja) |
JP (1) | JP2005091042A (ja) |
KR (1) | KR100839279B1 (ja) |
CN (1) | CN1849505A (ja) |
AU (1) | AU2004272864B2 (ja) |
WO (1) | WO2005026683A1 (ja) |
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US8109871B2 (en) | 2005-05-06 | 2012-02-07 | Minntech Corporation | Endoscope integrity tester including context-sensitive compensation and methods of context-sensitive integrity testing |
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Also Published As
Publication number | Publication date |
---|---|
CN1849505A (zh) | 2006-10-18 |
EP1666864A1 (en) | 2006-06-07 |
US7353692B2 (en) | 2008-04-08 |
JP2005091042A (ja) | 2005-04-07 |
KR100839279B1 (ko) | 2008-06-17 |
AU2004272864B2 (en) | 2008-05-01 |
AU2004272864A1 (en) | 2005-03-24 |
US20060196250A1 (en) | 2006-09-07 |
KR20060069492A (ko) | 2006-06-21 |
EP1666864A4 (en) | 2007-08-08 |
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