Abstract:
Improvements in apparatus for performing an assay to determine the presence or amount of a substance in a test sample, which apparatus comprises means for dispensing one or more reagents from containment means therefor into a reaction vessel and means for dispensing the sample from a sample container into said vessel for reaction with the reagents during performance of the assay are disclosed. The improvements reside in the apparatus further comprising containment means for the reagents integral and in combination with the sample container and the reaction vessel.
Abstract:
For use in testing a large volume of blood samples, portions of which are to be aspirated and then dispensed into one or more reaction wells, a pneumatic sensing system is characterized by an air pressure/vacuum source which is automatically coupled to a disposable pipette tip when the tip is picked up by a programmed gantry to provide a low pressure air flow through the pipette tip as it approaches the surface of the sample to be aspirated. A back pressure developed in the system as the pipette tip closely approaches and contacts the surface of the sample is detected by a pressure transducer which feeds the detected data to the gantry controller which instantaneously raises the pipette tip for purging and then moves it downwardly into the sample a distance equal to the sensed surface level plus a constant distance appropriate for the amount of the sample to be aspirated. Verification of the integrity of the system during both aspiration and dispensing of the samples is provided by the pressure transducer and the controller with a display screen of the controller providing a visual indicator.
Abstract:
For use in testing a large volume of blood samples, portions of which are to be aspirated and then dispensed into one or more reaction wells, a pneumatic sensing system is characterized by an air pressure/vacuum source which is automatically coupled to a disposable pipette tip when the tip is picked up by a programmed gantry to provide a low pressure air flow through the pipette tip as it approaches the surface of the sample to be aspirated. A back pressure developed in the system as the pipette tip closely approaches and contacts the surface of the sample is detected by a pressure transducer which feeds the detected data to the gantry controller which instantaneously raises the pipette tip for purging and then moves it downwardly into the sample a distance equal to the sensed surface level plus a constant distance appropriate for the amount of the sample to be aspirated. Verification of the integrity of the system during both aspiration and dispensing of the samples is provided by the pressure transducer and the controller with a display screen of the controller providing a visual indicator.
Abstract:
Improvements in apparatus for performing an assay to determine the presence or amount of a substance in a test sample, which apparatus comprises means for dispensing one or more reagents from containment means therefor into a reaction vessel and means for dispensing the sample from a sample container into said vessel for reaction with the reagents during performance of the assay are disclosed. The improvements reside in the apparatus further comprising containment means for the reagents integral and in combination with the sample container and the reaction vessel.