In contrast to the popular dolls of the day, which were often too heavy for small children and too fragile for play, Chase believed that softer, more durable dolls made of fabric would encourage a greater range of childhood play.
A revised model was used at Hartford Hospital Training School in Connecticut, and was the first to feature an arm injection site, and an internal reservoir for urethral, vaginal, and rectal treatments.
[5] The Chase Hospital Doll became a standard teaching method for health professionals, not only in the U.S., but also in Europe, Asia, and Latin America.
During World War II, the United States Army commissioned the Chase Company to make male mannequins for training medical corps personnel in hospital techniques.
[6] Some of the original Chase Hospital Dolls can be found in medical and nursing museums.