Breault and Hedgewick's Palm N Turn cap cut child poisonings

By the early 1960s, accidental child poisonings from swallowing household medicines were a leading cause of pediatric emergency visits and deaths across North America; Henri Breault, chief of pediatrics and director of the poison control centre at Windsor, Ontario's Hotel Dieu Hospital, treated the cases firsthand and pushed to found the Ontario Association for the Control of Accidental Poisoning in 1962 to do something about it.

The available approach to child-proofing anything was to make it physically harder to open — a tighter cap, more torque required, a harder surface to grip. That was the wrong axis entirely: a lid difficult enough to defeat a determined toddler was also difficult for the arthritic, elderly and physically weak adults who needed easy daily access to their own medication, and manufacturers who tried simple hard-to-open designs got complaints and returns rather than adoption.

Replaced strength with coordination: press the cap's outer edge, then rotate — a sequence a toddler can't manage but any adult can, regardless of grip.

The cap required pressing the outer edge and then rotating, a sequenced action toddlers' motor planning couldn't reproduce.

Adults with ordinary or weak grip could open it easily, so it didn't exclude the elderly or arthritic.

The design exploited a developmental gap, not a strength gap, so it separated children from adults.

Field trials showed a 91% drop in accidental poisonings, proving the mechanism worked in practice.

When a simple barrier would exclude a vulnerable group you want to admit, design the barrier around a developmental gap between the groups, not raw effort.

Endorsed by the Ontario College of Pharmacy and trialed in Essex County starting in 1967, the "Palm N Turn" cap was credited with a 91 percent drop in accidental child poisonings from prescription medicine during the years the trial ran. In 1974, Ontario became the first jurisdiction in Canada to mandate child-resistant closures on medicine containers, and the design was adopted nationally across Canada and then internationally.