Very practical issue..... We use Vygon UVC as routinely. In case of nonavailability of non affording patient, w use NG tube, same as you do. Practically it is encountered vry often that UVC is not advancing or have resistance. In that case we follow 2 techniques. 1. If we are using Vygon UVC and not advancing, we sometimes switch over to NG tube. Bcs Conventional UVC, including Vygon has opening at tip, while NG tube has blunt tip with side openings. This BLUNT TIP of NG tubes helps to pass through the resistence in LIVER. 2. IF we still have issues with advancing the NG tube, while inserting NG slowly with one hand, we give slight pressure on liver with another hand. The pressure is being given on the skin overlying Liver in downward direction while slowly advancing the NG as UVC. Most of the times, this proves helpful, even with Vygon UVC. Another technique is slowly advancing UVC in cork screw manner, if resistence is felt. But somehow, I have not fount this working. Pressure over Liver, many times has solved problem for us. Hope this proves useful to you. Do let me know for anything else, at manan179@yahoo.com