As politicians prepare to grill medical and legal experts on the divisive bill in special health committee hearings over the next three days, Mr Kenny insisted the legislation was about providing clarity and saving lives.
"The bill that we proposed here obviously doesn't change the legislation on abortion," the Taoiseach said.
"This is about saving lives and clearly fundamental to any assessment of any person with difficulty in pregnancy is the requirement to do everything that's possible, practicable in the sense of saving the life of the unborn as well as that of the mother."
Mr Kenny said he had read a letter from Archbishop Diarmuid Martin in which he made his first public intervention in the abortion debate.
The archbishop said he was concerned by the Government's plans to legislate for abortion on the grounds of suicide.
In the letter, he said his "anxiety" related to instances when an unborn child is viable yet doctors consider an abortion to save the mother's life.
The changes to the abortion rules, if enacted, will legislate for the 1992 X case judgment from Ireland's Supreme Court , which found abortion is legal if there is a real and substantial risk to the life of the mother, including the threat of suicide.
The case was taken by a 14-year-old rape victim who became pregnant and was refused permission to travel for an abortion.
The loosening of the rules is also intended to meet requirements from a European court decision that found a woman in remission from cancer should not have been forced to travel oversees for a termination.
In
his letter to the newspaper, the archbishop said a "destructive
abortion" of an unborn child where there is a threat of suicide was
contrary to the Constitution.
He added:
"There is a growing impression that the judgment of the X case 'is the
Constitution'. I believe it is an interpretation given in a specific
case which does not supersede or relativise the clear constitutional
right to equal protection for unborn life in the circumstances which I
have outlined.
"Indeed, under head four
(of the bill) it would give the life of such an unborn child less
protection than is guaranteed in liberal abortion laws in other
countries."
The Taoiseach insisted the
legislation would make clear the need for doctors to do their utmost to
save the life of an unborn child.
This,
he insisted, would become clear when the bill is produced following
three days of Joint Oireachtas Health Committee hearings - on Friday,
Monday and Tuesday.
"It's about saving
lives, giving clarity to the protection of the life of the mother and
the requirement to do everything that is possible and practicable in the
sense of saving the life of the unborn child as well," Mr Kenny said.
More than 50 medical and legal experts will give evidence during the hearings into the heads of the Protection of Life During Pregnancy Bill 2013.
The hearings, which will be conducted by the all-party health committee and chaired by Fine Gael TD Jerry Buttimer, will begin in the Seanad chamber on Friday.
The Taoiseach was challenged on the abortion legislation as he launched Eircom's new fibre broadband network at the company's headquarters in Dublin.
The first committee hearing, which is expected to last 10 hours, will include statements from Health Minister James Reilly, secretary general at the Department of Health Ambrose McLoughlin and chief medical officer Tony Holohan.
The
Institute of Obstetricians and Gynaecologists, Irish College of General
Practitioners, Irish Medical Council and Royal College of Physicians of
Ireland will also be represented.
The
masters of the three main maternity hospitals will give evidence in the
afternoon, including Peter Boylan of the National Maternity Hospital,
Sam Coulter Smyth of the Rotunda Hospital and Rhona Mahony from the National Maternity Hospital.
Doctors
from obstetric care facilities in other hospitals from across the
country will also be called to the first day of the hearings.