Patent ID: 8007740

Claim:
A reaction cuvette wash unit, comprising: a cleaning needle assembly which comprises at least one cleaning needle for cleaning its respective reaction cuvette, wherein the cleaning needle assembly comprises: a plurality of cleaning needles and one or more needle sheaths, each of which encloses at least a part of one of one of the plurality of cleaning needles; a supporter including an upper supporting plate and a lower supporting plate, each of which defines a plurality of respective mounting holes that are correspondingly provided for movably mounting the plurality of cleaning needles; one or more sheath holders, each of which is secured to one of the one or more needle sheaths defines at least one pinhole and at least one locating pin to prevent the plurality of cleaning needles from rotating; and one or more elastic members which enclose at least part of each of the one or more needle sheaths and is located between each of the one or more sheath holders and the upper supporting plate; a straight guide pair which comprises a sliding block and a guide, wherein the sliding block is connected to the cleaning needle assembly to cause the cleaning needle assembly to move; a driving device which is connected to the sliding block so as to cause the sliding block to move along an axis of the guide; a motor, an output shaft of which is connected to a lead screw in the driving device so as to drive the lead screw to move at least one of a plurality of cleaning needles in the cleaning needle assembly to or from a cleaning position to clean a respective cuvette; a trigger component, which is associated with the at least one cleaning needle in a manner to move with the at least one cleaning needle; a sensor for sensing the position of the trigger component, wherein the motor is operatively coupled to the sensor, and when the trigger component moves or is caused to move to a position, the sensor is triggered and sends a trigger signal to stop the motor from driving the driving device of the reaction cuvette wash unit to prevent the at least one cleaning needle from being further driven into the respective cuvette in the reaction cuvette wash unit.