More than 1,350 women who suffered devastating side effects from a pelvic mesh implant used to treat issues from childbirth have won a class action suit against global giant Johnson & Johnson.

Key points: The pelvic mesh implant was first promoted to women more than a decade ago

The pelvic mesh implant was first promoted to women more than a decade ago During the case, the court heard of a "tidal wave" of aggressive marketing to surgeons and patients that suggested implanting the mesh was a "quick and easy operation"

During the case, the court heard of a "tidal wave" of aggressive marketing to surgeons and patients that suggested implanting the mesh was a "quick and easy operation" The mesh implant resulted in acute and chronic pain for thousands of women as well as severe mental health issues

In what lawyers said was the largest women's health class action in Australia's history, Federal Court Justice Anna Katzmann said the evidence in the case was "overwhelming" and found the creator of the devices "negligent".

She said the devices, which were banned in 2017, were not tested properly, and that the companies responsible knew they did not have sufficient data to show they were safe.

Speaking outside court, Julie Davis, one of the applicants involved directly in the case, said the judgement was "a great step forward".

"We were treated like guinea pigs," she said. "They lied about it and did nothing to help.

"It was despicable."

Julie Davis (centre) surrounded by other women involved in the class action suit outside court in Sydney today. ( ABC News: Brendan Esposito )

Justice Katzmann said compensation — expected to be in the multi-millions — would be determined in February.

In an hour-long judgement, she said the maker of the device engaged in misleading or deceptive conduct, was driven by commercial interests and failed to give appropriate or sufficient remedial action once it knew of the problems.

Justice Katzmann said the risk assessment of the device was a "box-ticking exercise" and when harm was identified it was not rectified.

A number of women involved in the suit were present in court. They ranged in age from their early 30s to their 80s and were accompanied by friends and family.

Some of the applicants reacting outside court. ( ABC News: Brendan Esposito )

Some came with canes and others had to shift uncomfortably during the judgment, which they said was because of chronic pain associated with their mesh implants.

Others were visibly emotional, patting down their eyes, overcome after coming to the end of the case.

A number of women shook their heads as Justice Katzmann described how designers took mesh products "from their existing bag of tricks".

The device was created by medical company Ethicon and its subsidiaries, which is owned by global giant Johnson & Johnson.

Johnson & Johnson has sold more than 100,000 mesh and tape implants but said that did not equate to the number of women affected.

A vaginal mesh implant. ( ABC News: Jerry Rickard )

Shine Lawyers brought the class action on behalf of the women.

Speaking outside court, special counsel Rebecca Jancauskas said she understood there were about 8,000 people affected by the implants and encouraged more to come forward.

"The court didn't make a finding today in terms of the amount of damages," she said.

"But given the years of suffering these women have endured, the fact that their lives have been turned upside down and they can no longer function as women, as mothers and as employees, we would expect that compensation to be significant."

Holding someone accountable

For Louise King, the decision to head to court was never about the money.

Louise King has ongoing pain from pelvic mesh and it stopped her being intimate with her late husband. ( ABC News: Scott Kyle )

The mother-of-two had mesh implanted in 2006 following major prolapses in her vagina and bowel.

Speaking to the ABC before today's judgement, Ms King said she did not know there was a problem with mesh at the time.

"There was no option to choose anything else," she said.

Afterwards, she found having intercourse with her husband of nearly 40 years excruciating.

"I went back to the doctor three times and he told me I was imagining it," she said.

"He was quite rude."

Ms King eventually had a breakdown from her pain and discovered the class action.

Finding out there were other women in a similar situation was a turning point.

"I didn't feel so alone."

For her, the case has been about having her day in court and holding someone accountable.