[Neuroscience] Square section capillaries

[Trevor Lewis]

I've got a picture in my head of square section borosilicate 
capillaries, arranged in a fused array of three or four tubes, that 
would be useful for a drug application system. I've checked WPI and 
Harvard Apparatus, but they don't have such a thing. Hilgenberg does 
supply single square section capillaries but not arrays.
Does anyone know if there is such a thing available, or am I making things up?

Thanks,

Trevor Lewis