Right. That's the next stage up, pumps, plumbing, and instrumentation. The "cartridge" mentioned is the hard part.

Here's a company which makes the "chips" which go in such cartridges.[1] And here are some chips.[2] Making those involves etching tiny patterns in glass, lining the channels with various coatings, and assembling the layers of glass into devices. All this has to be done in a very clean environment. Note the similarity to the processes in a wafer fab.

The point here is that the semiconductor industry has many processes and tools which might be helpful if there's a need to manufacture microfluidic components in quantity.

[1] https://www.dolomite-microfluidics.com/

[2] https://www.dolomite-microfluidics.com/product-category/micr...