In order to bring a successful product liability case based on negligence, the plaintiff must prove that the defendant breached their duty of care to the consumer, that the breach caused the plaintiff's injury, and that the plaintiff suffered damages as a result. In other words, the plaintiff must show that the defendant had a duty to make a safe product, that they failed to do so, and that the plaintiff was injured as a result.
The available defenses in a product liability case based on negligence include assumption of risk, comparative negligence, and contributory negligence. Assumption of risk means that the plaintiff knew of the potential danger of the product and chose to use it anyway. Comparative negligence means that the plaintiff's own negligence contributed to their injury, and the damages awarded will be reduced proportionally. Contributory negligence means that the plaintiff's own negligence contributed to their injury, and they will be barred from recovering damages.
It's worth noting that product liability cases can be complex and difficult to prove, as they often involve technical and scientific evidence. It's important for plaintiffs to seek out experienced legal counsel and to have a strong case before pursuing litigation.