Thank you for your consult at DoctorSpring.com.
I will answer point to point.
1.All the tubes are same. They are commonly called as Ryles tube.But, the method of placing is different. Gastric feeding tube is passed through nose . gastrostomy tube is passed through open incision over the abdomen. Percutaneous tube is passed under Endoscope guidance.
2.PEG is the latest procedure which is done by Endoscope. Under the video guidance, the tube is kept in the stomach.The tube,i. e.Ryles tube is the same tube that is used here also.
3.It all depends on the general condition of the patient, whether Ryles tube can be placed directly into the stomach after cutting the abdomen or by Endoscope approach.
Hope I answered your queries.
If you have any questions, I will clarify further.