What You Would Have to Show in a Product Liability Claim
A product liability claim generally asks three things: was there a defect, did the defect cause the injury, and was there real harm. In practical terms, the defect question asks which of three stories fits what happened to you. If the claim is that the product was unreasonably dangerous even when built exactly as intended, that is a design-defect claim. If the claim is that your particular unit departed from its design, that is a manufacturing-defect claim. If the claim is that the warnings or instructions you received did not adequately convey a risk, that is a failure-to-warn claim.
The federal reporting regulation shows how broad the idea of a defect can be, though it governs what companies report to the CPSC rather than what a state court requires. Under 16 C.F.R. § 1115.4, a defect is "a fault, flaw, or irregularity that causes weakness, failure, or inadequacy in form or function." The regulation says a defect may result from a manufacturing or production error, from the design of or the materials used in a product, and may also occur in a product's contents, construction, finish, packaging, warnings or instructions. State courts apply their own definitions.
Causation is the second element. The defect has to have caused the injury, not merely been present. Damages are the third: physical injury, property loss or death. The law generally does not compensate a frightening near-miss that caused no injury or loss.
Negligence approaches the same events from a different angle. It asks whether the company owed you a duty of care, breached that duty, and whether the breach caused your harm. Many states also allow strict liability for defective products, which means an injured person does not have to prove that the company was careless, only that the product was defective and caused the harm. The availability and shape of strict liability differ by state.
Whether any of these elements is met depends on the facts. An injury does not by itself prove a defect, and an accident does not by itself prove causation. If you are trying to judge whether what happened could fit one of these theories, that is a question a conversation with an attorney can help sort out, using the product, the records and the state's law.