Margo MacDonald, MSP, outlined her revised bill to legalise assisted dying at an event held in Glasgow on end of life care.
Among the changes, would be the right for patients, including those who are healthy, to record their wishes with a GP.
The age at which patients could do this has not yet been decided but could be as young as 16, according to the MSP.
She said the change was brought in to allay fears that a patient has not been coerced into their decision for assisted suicide and is of sound mind.
Among those at yesterday's conference was Dr Ian Kerr, the East Renfrewshire GP who is under investigation by police after he admitted helping three patients to end their lives.
The bill to legalise assisted dying is expected to go before the Scottish Parliament in the summer. The MSPs previous bill fell in a free vote at Holyrood two years ago.
She said: "I get quite emotional about it, because there are a lot of people depending on it.
"There are some people here today who it might apply to. I'm much more confident now. I think opinion has moved on."
On the right of patients to record their wishes with a GP, she said: "It's making sure first and foremost, that the patient has not been coerced. I think that's what people are frightened of.
"A record would be kept in a GP's file that you have expressed a desire to be able to have assistance to end your life when if you find yourself in the position of being terminal or suffering from an degenerative condition.
"Anyone over 16 or 18 would have that right."
Another change to the last, unsuccessful bill, is the involvement of two 'facilitators' or 'friends at the end' who would assist the patient.
Estimates suggest that around 50 each year in Scotland might opt for assisted death.
Ms MacDonald faced opposition from Councillor Jeremy Balfour, of the Scottish Council of Bioethics, over the apparent loss of dignity suffered by patients with terminal illness.
He said dignity was "inherent" and could not be lost, even when the body is in decline.
The Lothians MSP, who has Parkinson's Disease, said her next campaign would be to ensure everyone who works in a care home is required to have a qualification to help drive up standards.