Cytosponge is the 'pill on a string' device that one swallows in a GP surgery. It is then pulled up and the sponge scrapes off samples from the lining of the oesophagus which can then be sent off for analysis.
youtube.com/watch?v=iGqBu4C...
It has the potential to screen many patients who would otherwise need a full endoscopy and may be a key way of dealing with the workload faced by endoscopy units when many more people need checking for persistent heartburn.
There is a motion before the Scottish Parliament about it, so if any of you are in a Scottish consttiuency, please contact your MSP and ask for their support if they have not already signed the motion:
Lanzoprazole and side effects
Diabetes and oesophagectomy 
