[DIYbio] automated liquid delivery to a petri dish

Hey DIYBio-ers,

I am hoping you can offer advice for a project I am working on.

I need to deliver liquid nutrients to a culture of c. elegans nematodes via an Arduino-controlled syringe pump. This syringe pump part is actually done. What I need is some stable hardware to connect the tubing from the syringe (via a luer-locked dispensing needle or similar connector) to different areas of a petri dish. Perhaps something like a perfusion chamber systems like this one:
http://www.biosciencetools.com/catalog/Fitting_Kit.htm

I've also been looking at building a simple microfluidic chamber.

I also need to be able to monitor all this via a digital microscope, so it must be unobstructed for the top.

I have a rough set-up that I created for testing by simply drilling a small hole into the petri dish to put the dispensing needle through. But I said I need something more stable.

Any ideas or suggestions as to how to proceed?

Thanks
Carlos

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