A POSA prior to October 13, 2008, would include someone who had, through education or experience, the equivalent of a bachelor’s degree in mechanical engineering, or a related field, and an additional two years of work in, or at least an understanding of, the basics of medical-device design and manufacturing techniques.
As explained in detail in section IX.C, a POSA would have found it obvious to replace the stop illustrated in Bitdinger with a spring washer, like those De Gennes taught, to provide the same securing function for the cartridge.
As also explained more in section IX.C, a POSA would have understood the legs taught by De Gennes was a form of “fixing elements” that would successfully fix the spring washer to the housing in order to exert its biasing force on the cartridge.
As illustrated below in partial, annotated views of FIGS. 2 (left) and 3 (right), like Bitdinger’s stop, Schofield’s resilient cushion 14 also includes a low profile and a uniform base for applying a biasing force on the cartridge to secure it against movement within the device.
Finally, while Bitdinger has an overall aim to reduce the likelihood that an incorrect cartridge is installed in the injection pen, see, e.g., EX1009, 2:46-52, 2:58-63, 2:66-3:2, the POSA would have predictably implemented a spring-washer system that still minimized the risk of cross-installation by fine-tuning the washer such that it compensated for tolerance ranges associated with a specific cartridge- type.