Know your rights
I believe you have both options.
The Manufacture is liable, and the rental company. That would be a negligence suite.
Your company's workman's compensation company is liable as well for your injury. In addition to paying for your lost work wages 70% in New Jersey, you are entitled to sue for the damage done to you. With workman's comp. you are viewed as a piece of machinery. You are now a damaged piece of machinery (how they view it).
I was injured last Feb (06). Workman's comp. delayed my treatment, treated me for the wrong thing, and only delayed the necessary surgery for a year. I am currently out of work after having my C5 C6 C7 vert fused. I now have a titanium bracket screwed into my spine after they removed the two bulging disks, and inserted cadaver bone where the disk's used to be.
My lawyer tells me work comp will end paying aprox $50,000 to me in a lump sum, and be responsible FOREVER for any future problems. In New Jersey the lawyer gets 20%, but 10% comes from the insurance company.
Workman's Comp does not care about you. They will tell you anything to get you back to work and off their books. By law you are entitled to a second opinion. See a lawyer first and then take it from there.
It might be a injury you can live with right now, but (like mine) it may become much worst. Now is the time to take action, and don't let them bully you around. Once they know you have a lawyer you will get much better treatment.
My opinion from my experience.
PS: I used to sell commercial insurance, workman's comp as well and got out of the industry because they are a bunch of scumbags with no honor, and only care about $$$$.
If you need more info let me know and I will do what I can.