The Heyer-Schulte breast implants were the first United States manufactured saline implants back in 1968. Heyer-Schulte Breast implants initially manufactured the polyurethane silicone gel prosthesis with an internal Y-shape baffle called the Natural Y Prosthesis. Heyer-Schulte later introduced multiple single lumen gel implants in the early 70s. These implants notably had a thinner shell.
The Heyer-Schulte Breast implants have had data on shell thickness and gel characteristics that were not initially available by the company. Dorne reported weights of average silicone gel molecular weight to be 83,500, significantly higher than the modern Silastic II silicone gels of 55,000 molecular weight.