Sample collection and testing system having a displacement member causing reagent to come into contact with a sample collection surface
Methods and apparatus for evaluating the quality of a sample of a product, an ingredient, an environment or process by measuring multiple parameters thereof, including light emitted from a reacting sample containing ATP, ADP, alkaline phosphatase or other parameters such as pH, temperature, conductivity, reduction potential, dissolved gases, specific ions, and microbiological count. The apparatus comprises an integrated sample testing device used to collect a sample, mix reagents, react the sample, and collect it in a measurement chamber. The apparatus also comprises an instrument having a photon detection assembly for use with the sample testing device. The instrument can also comprise one or more sensing probes and a communication port to facilitate data collection, transfer and analysis.
1. A sample testing device, comprising:
a displacement member configured to be manually actuated;
a chamber configured to release a reagent when the displacement member is actuated;
a channel through which the reagent is propelled by actuation of the displacement member, the channel also being disposed to receive liquid to facilitate mixing of the reagent with the liquid and to direct the reagent and liquid in a flow path toward a measurement portion of the sample testing device;
a sample collection surface disposed in the flow path of the reagent such that actuation of the displacement member causes the reagent to come into contact with the sample collection surface to release a sample into the reagent; and
a measurement chamber of the test device into which the reagent is delivered by the actuation of the displacement member, the measurement chamber providing a chamber in the sample testing device in which to hold the reagent while a parameter thereof is being measured.
2. The sample testing device of claim 1 wherein the measurement chamber extends beyond an end of the sample collection surface so that the sample collection surface is not disposed in a measurement path of a detector used to measure a parameter of the sample within the measurement chamber.
3. The sample testing device of claim 2 wherein the sample collection surface is configured to remain in contact with reagent delivered into the measurement chamber by the displacement member, such that the reagent can continuously liberate sample from the sample collection surface while the parameter of the sample is being measured.
4. The sample testing device of claim 1 wherein there are a plurality of reagents and a plurality of chambers configured to release the plurality of reagents when the displacement member is actuated.
5. The sample testing device of claim 4 wherein the measurement chamber is continuous and optically uniform.
6. The sample testing device of claim 4 wherein the measurement chamber is clear.
7. The sample testing device of claim 4 is translucent and allows photon passage.
8. The sample testing device of claim 4 wherein at least one of the reagents is in dry form.
9. The sample testing device of claim 1 wherein the chamber configured to release the reagent is sealed and displacement of the displacement member releases reagent from the chamber configured to release the reagent.
10. The sample testing device of claim 9 wherein displacement of the displacement member causes reagent to be released by forcing a piercing member through a portion of the chamber configured to release the reagent.
11. The sample testing device of claim 1 further comprising a piercing tip, wherein displacement of the displacement member causes the chamber configured to release the reagent to be displaced and to come into contact with the piercing tip thereby releasing reagent.