Law firm Shine Lawyers says the Federal Court will announce its decision on Thursday in the legal action against international medical giants Johnson & Johnson and Ethicon over their pelvic mesh and tape implants.

Vaginal mesh implants, which were given to women to treat pelvic floor damage, are believed to have adversely affected as many as 8000 women.

Many have since been treated for stress incontinence and prolapse, often after giving birth, resulting in chronic and debilitating pain and the inability to have sex.

Shine's class action began in October 2012, with a seven-month trial held in 2017.

There are 1350 women who have registered to take part in the class action.

"It has been a long journey to get here through this legal process," Shine Lawyer's Rebecca Jancauskas said in a statement.

"We have fought hard to have these women's voices heard, as they've struggled with the chronic pain and complications from their mesh and tape implants."

Australian Associated Press