I think the demise of the Double Balloon Nozzle is a result of the realization that the use of the Nozzle could result in perforation of the bowel. This caused the recommendation to stop using the Nozzles in the medical field.
@weewetone Very interesting. Do you have any references to that recommendations? I didn't manage to find any by myself. Thanks!
Currently i see a plenty of inflatable nozzles on the market:
Like this (found in just about several minutes):
https://www.amazon.com/CleanStream-Double-Silicone-Enema-Catheter/dp/B003CU684W
https://www.amazon.com/Cleanstream-DE720-Inflatable-Enema-Plug/dp/B005HZR3FS
https://www.medtech3000.de/Ballondarmrohr-Ballon-Darmrohr-mit-Silikonballon::6.html
https://www.optimalhealthnetwork.com/Inflatable-Double-Bulb-Enema-Nozzle-p/532.htm
https://www.optimalhealthnetwork.com/Flexible-Inflatable-Enema-Nozzle-No-Pillow-p/522.htm
https://www.optimalhealthnetwork.com/Enema-Retention-Inflatable-Silicone-Single-Nozzle-p/529.htm
https://www.dudea-latexshop.de/pt/produto/enema-plug-infl%C3%A1vel/
https://heltisdiffusion.com/en/barium-enema-tips-and-bags/11882-rectal-enema-tip-double-contrast-with-balloon-adult-size
https://www.boenmedical.com/?products=double-balloon-enema
https://www.amazon.com/Inflatable-Enema-Kit-Efficient-Digestion/dp/B0CP2S3576
https://www.amazon.com/Inflatable-Congestion-Cleaning-Expansion-Beginner/dp/B0CZRLPLQC/139-0846510-6980257?psc=1
Some of those are obvious sex-toys from china, some are more-or-less medical. Some of them are relatively new (first seen in a last year or two), others are there for at least a decade.
So there is a market for this kind of things.
The issue is that, at least in my taste, all of them are barely usable due to design defects and (or) bad production.