Splashguard and cassette assembly for sterility testing
Membrane filtration is a technique for performing sterility testing on products, in which a sample is introduced to a sterile environment (such as a cassette) through an inlet port and then passed through one or more filters. The samples may be pumped into the cassette at a relatively high pressure, which can cause the sample to spray, mist, or foam. When the sample sprays in this manner, it can cause inconsistent results and can obscure the view through the lid of the cassette, which makes it difficult to analyze the incubated media. Exemplary embodiments provide a unique splash guard sized and shaped to transition the incoming sample fluids from a high-pressure state to a lower pressure flow. Consequently, the fluid flows more smoothly into the cassette which yields more consistent and accurate results.
1 . An apparatus, comprising:
a cassette assembly comprising a lid, a mid-body assembly including an inlet configured to receive one or more fluids at a first pressure and direct the one or more fluids into an internal space of the cassette assembly, a membrane filter, and an outlet configured to release the one or more fluids from the cassette assembly after the one or more fluids pass through the membrane filter; and
a splashguard separate from the mid-body assembly and configured to interrupt a fluid flow between the inlet and the membrane filter, wherein the splashguard comprises a cover that extends between the inlet and the lid and a groove configured to change a direction of a flow of the one or more fluids, wherein the groove is provided on an underside of the cover of the splashguard.
2 . The apparatus of claim 1 , wherein the splashguard is configured to reduce the pressure of the one or more fluids from the first pressure to a second pressure lower than the first pressure.
3 . The apparatus of claim 1 , wherein the cassette assembly comprises a base assembly comprising the outlet.
4 . The apparatus of claim 3 , wherein the splashguard is provided between the lid and the mid-body assembly.
5 . The apparatus of claim 3 , wherein the splashguard is provided on the mid-body assembly or on a foil cutter that is configured to be disposed between the lid and the mid-body assembly.
6 . The apparatus of claim 1 , wherein the splashguard comprises a through-hole configured to receive a fastener to attach the splashguard to the cassette assembly.
7 . The apparatus of claim 6 , wherein the fastener is built into the cassette assembly.
8 . The apparatus of claim 1 , wherein the splashguard redirects the one or more fluids that enter the inlet in a radial direction of the cassette to a circumferential direction of the cassette.
9 . The apparatus of claim 1 , wherein the splashguard and cassette assembly comprise mating alignment elements.
10 . A method comprising:
assembling the cassette assembly and splashguard of claim 1 ;
inserting a fluid delivery device into the inlet; and
causing a fluid to be delivered to the inlet, wherein the fluid is redirected by the splashguard.
11 . The method of claim 10 , wherein:
the inlet comprises a rubber septum,
inserting the fluid delivery device into the inlet comprises piercing the rubber septum with a needle, and
causing the fluid to be delivered to the inlet comprises delivering the fluid through the needle.
12 . The method of claim 10 , wherein assembling the cassette assembly and splashguard comprises inserting one or more fasteners attached to the cassette assembly into one or more through-holes of the splashguard.
13 . The method of claim 10 , wherein assembling the cassette assembly and splashguard comprises aligning the splashguard to the cassette assembly using one or more mating alignment elements provided on the cassette assembly and the splashguard.
14 . The method of claim 10 , further comprising using the splashguard to reduce a pressure of the fluid between the inlet and a membrane.
15 . The method of claim 10 , wherein the cassette assembly comprises a base assembly comprising the outlet and assembling the cassette assembly comprises:
attaching the splashguard above the mid-body assembly;
placing the mid-body assembly on the base assembly; and
placing the lid over the splashguard and mid-body assembly.
16 . The method of claim 15 , further comprising providing a foil cutter on the mid-body assembly, wherein the splashguard is attached to the foil cutter.
17 . The method of claim 15 , further comprising providing a seal between the mid-body assembly and the base assembly.
18 . The method of claim 15 , further comprising providing a seal between the mid-body assembly and the lid.