Dispensing apparatus and automatic analyzer
View Patent ↗A dispensing apparatus includes a probe that sucks or discharges a liquid; a pressure generating unit that generates a pressure necessary for the probe to suck or discharge the liquid; and a pressure measuring unit that measures the pressure generated by the pressure generating unit and applied to the probe. The apparatus also includes a setting unit that sets a correction coefficient used when correcting a physical amount based on characteristics of the dispensing apparatus using a result of the measuring by the pressure measuring unit; a storage unit that stores therein information including the correction coefficient set by the setting unit; and a correcting unit that corrects the physical amount using the correction coefficient stored in the storage unit.
1. A dispensing apparatus comprising:
a probe that sucks or discharges a liquid;
a pressure generating unit that generates a pressure necessary for the probe to suck or discharge the liquid;
a pressure measuring unit that measures the pressure generated by the pressure generating unit and applied to the probe;
a first processor, the first processor configured to set a correction coefficient used when correcting a physical amount based on characteristics of the dispensing apparatus;
a storage unit that stores therein information including a reference pressure of a standard pressure measuring unit and the correction coefficient set by the first processor, the first processor configured to set the correction coefficient; and
a second processor, the second processor configured to correct the physical amount using the correction coefficient stored in the storage unit, the corrected physical amount being used for detecting abnormality,
wherein the first processor is configured to set the correction coefficient using the reference pressure stored in the storage unit and a result measured by the pressure measuring unit when sucking or discharging a reference liquid, the correction coefficient representing a difference between the pressure measuring unit and the standard pressure measuring unit.
2. The dispensing apparatus according to claim 1 , wherein the first processor and the second processor comprise a central processor.
3. The dispensing apparatus according to claim 1 , wherein the pressure measuring unit includes
a pressure sensor that detects a variation in the pressure applied to the probe and converts the variation into an electric signal; and
a signal processing circuit that performs signal processing including amplification and A/D conversion on an output of the pressure sensor.
4. The dispensing apparatus according to claim 3 , wherein the physical amount includes the output of the pressure sensor.
5. The dispensing apparatus according to claim 3 , wherein the physical amount includes a factor with which a signal is amplified by the signal processing circuit.
6. The dispensing apparatus according to claim 3 , wherein the physical amount includes a digital value output after the A/D conversion by the signal processing circuit.
7. The dispensing apparatus according to claim 1 , further comprising a third processor, the third processor configured to detect abnormalities that detects a dispensing abnormality of the dispensing apparatus by use of the physical amount corrected by the second processor, the second processor configured to correct.
8. The dispensing apparatus according to claim 7 , wherein the third processor, the third processor configured to detect abnormalities determines whether there is a clog in the probe by comparing a maximum value of a discharge pressure applied to the probe with a predetermined threshold, and
the third processor, the third processor configured to detect abnormalities determines whether a dispensing amount of the probe is small or large by comparing the dispensing amount with a predetermined normal range.
9. The dispensing apparatus according to claim 8 , wherein the physical amount includes the threshold and the normal range.
10. The dispensing apparatus according to claim 7 , wherein the first processor and second processor and the third processor comprise a central processor.
11. An automatic analyzer for analyzing a specimen by reacting the specimen with a reagent, the automatic analyzer comprising a dispensing apparatus as a specimen dispensing unit for dispensing the specimen, the dispensing apparatus including:
a probe that sucks or discharges a liquid;
a pressure generating unit that generates a pressure necessary for the probe to suck or discharge the liquid;
a pressure measuring unit that measures the pressure generated by the pressure generating unit and applied to the probe;
a first processor, the first processor configured to set a correction coefficient used when correcting a physical amount based on characteristics of the dispensing apparatus;
a storage unit that stores therein information including a reference pressure of a standard pressure measuring unit and the correction coefficient set by the first processor, the first processor configured to set the correction coefficient; and
a second processor, the second processor configured to correct the physical amount using the correction coefficient stored in the storage unit, the corrected physical amount being used for detecting abnormality,
wherein the first processor is configured to set the correction using the reference pressure stored in the storage unit and a result, measured by the pressure measuring unit when sucking or discharging a reference liquid, the correction coefficient representing a difference between the pressure measuring unit and the standard pressure measuring unit.
12. The dispensing apparatus according to claim 11 , wherein the first processor and the second processor comprise a central processor.