Disposable diagnostic device with vented priming fluid passage for volumetric control of sample and reagents and method of performing a diagnosis therewith
A diagnostic cartridge and method of performing a diagnostic test are provided. The cartridge includes a body having a sample chamber for receipt of a sample, an analysis chamber, and a reagent-containing dispensing member. A valve member is coupled to the body for selective movement between first and second states. The valve member has a fluid passage with a hydroscopic, gas permeable vent. In the first state, the fluid passage is out of fluid communication with the sample chamber and is registered for fluid communication with the reagent-containing dispensing member. The vent prevents fluid from passing therethrough and allows air to vent therefrom as reagent flows into and fills the fluid passage. In the second state, the fluid passage remains in fluid communication with the reagent-containing dispensing member and is brought into fluid communication with the sample chamber to facilitate transporting the sample to the analysis chamber.
1. A method of performing a diagnostic test on a fluid sample via a disposable diagnostic cartridge, comprising:
introducing a sample into a sample receiving chamber of the disposable diagnostic cartridge;
rupturing a fluid-containing blister of the disposable diagnostic cartridge;
urging fluid to flow from the fluid-containing blister into a fluid passage of a translatable valve member while the translatable valve member is in a first state and causing air to evacuate the fluid passage;
translating the valve member to a second state and bringing the fluid within the fluid passage into fluid communication with the sample; and
urging the fluid within the fluid passage to transport the sample to an analysis chamber of the disposable diagnostic cartridge.
2. The method of claim 1 , further including automatically forming a controlled volume meniscus of the sample at a sample outlet of the sample receiving chamber upon introducing the sample into the sample receiving chamber.
3. The method of claim 1 , further including translating the valve member linearly from the first state to the second state along an outer periphery of the disposable diagnostic cartridge.
4. The method of claim 1 , further including filling the fluid passage of the translatable valve member entirely with the fluid from the fluid-containing blister prior to translating the valve member to the second state.
5. The method of claim 4 , further including venting any air from the fluid passage of the valve member prior to translating the valve member to the second state.