Hey,

I came across a study online of the inner diameter size(drainage channel) of different catheter sizes for 4 different brands http://www3.ha.org.hk/haconvention/h...ral/SPP3.3.pdf

It doesn't mention what the brands are, just labels them A, B, C and D.

There was quite a lot of variation between inner diameter size(drainage channel) of the different brands of the same fr size. For 4 different brands of size fr16 they had different sizes of inner diameter size(drainage channel) even though their outside diameter was the same. So basically the different brands had different catheter wall thicknesses.

It would be interesting to know which brands have the largest inner diameter size(drainage channel) for each size because they would probably take longer to block vs the same fr size of a different brand.

If people measured it and posted the measurement here with what the brand, model and fr size is it would be easy to figure out and would probably be useful.