Jamie O'Brien, chief executive of The Rayware Group which owns Viners, said: "Knife crime is obviously a very complex issue and a complex societal issue.
"Our product won't change that but what we believe is [that] design can make simple steps to dramatically improve safety, just as with seatbelts or with safety lids on kids' medicines."
When challenged on why his company still sold pointed-knives, Mr O'Brien said: "For us, it's about the legislation from the government.
"We don't believe in necessarily banning retailers – that is not our decision.
"We believe in legislation that improves the effectiveness of safer options."
Ms Lucas also compared the Let's Be Blunt campaign to previous widespread shifts in public behaviour like the ban on smoking indoors.
"I don't think it's something that would happen overnight," she said.
"There are barriers there – I'm very aware of that.
"But we just want to form that education. We want to bring that awareness to light."
'Form of epidemic'
According to figures from the Office for National Statistics (ONS), there were about 50,000 offences involving a sharp instrument in the year ending March 2024.
That is about 4.4% higher than the previous 12-month period, although just under 3% lower than in 2019-20.
"What worries me is we're in this form of epidemic, and we're not seeing it as an epidemic," Ms Lucas said.
"Knife crime is increasing year on year, and I don't see how we're going to get hold of it if we don't all work together."
Ms Lucas has been invited to a Parliamentary reception on behalf of knife crime charity the Ben Kinsella Trust.
Its CEO Patrick Green said hearing the voices of people like Leanne, who have been directly affected, is critical.
"It brings two things, it brings passion and determination to tackle knife crime, but it also brings something particularly when talking to young people about lived experience and the authenticity of those messages which cuts through statistics, which explains the horror of knife crime in a way nothing else can".
Ms Lucas is also hoping her story will have an impact when making her case later to MPs in Westminster.
"We need to all get on board as a member of the general public and say we're not OK with the increase in knife crime, and we want to play a tiny part towards preventing future knife crime," she said.
"I can't now 'unsee' what's in the kitchen, so I've got to do something about that.
"And I think that's the movement we're trying to create."
