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Standard scopes have a diameter <=10mm with an instrument channel of 2.8mm
Austin has the Olympus GIF-HQ190, which is diameter 9.9mm, working channel 2.8mm, working length 1.03m
Therapeutic gastroscopes have a 3.8-4.2mm instrument channel
Slim-calibre gastroscopes are available with diameters 4.9-5.9mm. The size of the working channel depends on the specific instrument
Austin's slim scope is Olympus GIF-XP190N which is diameter 5.4mm, working channel 2.2mm (too small for CRE balloons or NJ tubes), working length 1.1m Forceps with a central spike can be helpful in taking biopsy specimens from a lesion that can only be approached tangentially
Hot biopsy forceps can be used to destroy small polyp up to 3-4mm. However, this can lead to surprisingly large delayed bleeds, and has therefore been mostly abandoned in favour of cold snare.
I think the width of open biopsy forceps is 6mm 1% acetic acid (Barrett's assessment)
0.5% methylene blue (intestinal metaplasia in stomach, adenomatous polyps, Barrett's)
2% Lugol's iodine (Squamous oesophageal dysplasia or cancer)
0.2% indigo carmine (Barrett's oesophagus or adenocarcinoma) Small (2-7mm) polyps can usually be snared with a 10mm loop Low-power settings are generally used (15-50W)
Pure coagulating current alone is probably safer and more predictable
