You might find this useful. The Green Power or Green Star(both names refer to the same juicer). There is some info at the bottom on the Green Power juicer, and why although it is a top quality juicer, it may not be the best for a cancer patient.
Why liquefiers (blenders) and centrifugal juicers don’t work for cancer patients
From the Gerson Institute: “Dr. Gerson said in his address to a group assembled in Escondido, California in 1956 (Appendix II, p. 406, A Cancer Therapy): ‘At first I thought that liquefiers would be the most wonderful thing. All the material was there, nothing was lost. But it didn't work.’ The rotating blade gives rise to a ‘dynamo effect’, causing electricity to be generated, thus killing enzymes. The same is true of centrifugal juicers. Juices must be made by grinding the vegetables first, mixing them, and then pressing them in a press. We have come across cancer patients who tried to heal themselves on the Gerson Therapy using a centrifugal juicer, but they experienced no improvement [but compare Anecdotal Case History: exclusive Gerson diet/therapy using centrifugal juicer leading to full recovery from terminal pancreatic cancer]. When they tried the Therapy with a Champion juicer, they did well. More seriously ill patients still need the grinding plus pressing type of juicer to properly heal. In response to a question from a patient about the two-step juicing process, Dr. Gerson wrote that ‘the malic acid (contained in the apples) mixed with the ground carrots helps to release the minerals from the carrots.’ In other words, it is necessary to first grind the apples and carrots together into a bowl, using a grinder. Norwalk, K&K or Champion juicers can all be used as grinders, but the Champion cannot be used as a press. The ground materials are mixed and then the mixture is placed in a press cloth and put under pressure in the Norwalk or K&K press. This process produces the best extraction, that is richest in minerals, and best in taste. Juice produced by the Champion juicer alone separates into a transparent liquid at the bottom and mush on top after a very short time. This juice is also harder for the patient to drink because of the particles, and is not as rich and homogeneous in nutrients. More recently the Green Power juicer was introduced. It does a better job of extraction than the Champion when used as a juicer, but it offers no way (as the Champion does) to block the juicing action. It is impossible to use the Green Power juicer solely as a grinder, as it does the grinding and juicing in one operation. While it extracts juice quite efficiently, it does not fulfill Dr. Gerson's requirement of mixing the ground apples and carrots thoroughly before pressing.” (The Gerson Institute also maintains a list of individuals with used juicers for sale.)