In the U.S. Medicare and/or other insurance pay a daily rate for the patient to use a machine that is either owned or rented by the patient’s dialysis clinic. Medicare and insurance also pays for supplies that are needed for treatment prescribed by his/her kidney doctor. It may be difficult to find an individual who legally owns a machine that he/she can sell.
Some companies do business in used refurbished equipment. Here are a couple of such companies:
GIA Medical - http://www.giamedical.com/index.html
Wil-Med - www.wilmedglobal.com
Here’s information on Baxter in Vietnam (See G43 on page 20 for the contact in Singapore):
Here’s an article from 2007 on dialysis and transplant in Vietnam. At that time CAPD (manual exchanges) were more common. You may want to contact the author whose email is at the bottom of the first page.
Finally, if your uncle requires dialysis and he wants to do peritoneal dialysis, he will not only need to get the machine, but he will need to be trained how to use it, have a way to get the PD solution and supplies, and have a doctor to prescribe all that he needs and to provide medical care.