Luis Prieto, a laser-cutting system operator, was killed when a descending steel beam trapped him between components of a machine he was operating. The system included a material handler, a load frame, and a main frame, with a narrow gap between the handler and the load frame creating a pinch point. Prieto's estate sued Cincinnati Incorporated, the entity responsible for designing, selling, installing, and maintaining the system, alleging negligent design, negligent installation, and negligent failure to maintain or warn of dangers. The district court granted Cincinnati's motion for summary judgment on all claims, concluding that the system was adequately designed because a wall-side barrier had been installed at some point, and that there was no evidence the victim entered the gap through the unguarded wall-side entrance. The estate appealed, arguing that the system lacked reasonable alternative safety features and that the missing barrier was the cause of the accident.
The First Circuit applied Massachusetts law, which requires a plaintiff in a design defect case to show an available design modification that would reduce risk without undue cost or interference with performance. The court found that the estate's expert provided sufficient evidence to create a triable issue on this point. The expert testified that a safety mat and an E-stop mechanism would have prevented the injury and that these additions were feasible without impairing the machine's utility. The court rejected the district court's reliance on the expert's statement that a wall-side barrier was 'reasonable on its face,' noting that this did not address the overall system design or the existence of other unguarded entry points. The court emphasized that the expert's opinion was not conclusory but based on a reasoned inference that the additional safety mechanisms would have stopped the machine while Prieto was in the gap. Regarding the maintenance and installation claims, the court affirmed the lower court's decision. These claims required the estate to prove causation, specifically that the absence of the wall-side barrier caused the injury because Prieto likely entered through that opening. The record showed at least two other ways Prieto could have reached the pinch point, and the estate offered no evidence beyond the testimony of a predecessor who preferred that entry route. The court held that this was insufficient to elevate surmise to probability, as the predecessor never met Prieto and their preferences could not be assumed to be identical.
The case is remanded to the district court for trial on the design defect and warranty of merchantability claims. The estate must now prove to a jury that a reasonable alternative design existed and that its omission rendered the product unreasonably dangerous. The manufacturing defect, negligent installation, and negligent maintenance claims remain dismissed, closing those avenues of liability for the estate. This decision reinforces the requirement for plaintiffs to provide specific, probative evidence of causation when challenging maintenance claims based on the absence of a specific safety feature.
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