BONE MILL WITH AN ACCESSIBLE MILLING ELEMENT

A modular bone mill system (30) for converting bone stock into bone chips comprises a base module (32) and a milling module (60). The milling module comprises a shell (34) adapted for releasable attachment to a base module (32) that includes a motor (38) and a sensor (54). The shell (34) has an inlet opening (152) through which bone stock is introduced into the shell (34), an outlet opening (96) through which bone chips are discharged from the shell (34), and a milling element (170) disposed in the shell (34) between the inlet opening (152) and the outlet opening (96) for converting bone stock into bone chips. The shell (34) includes a lid (126) that is removably attached to a foundation (62), the lid (126) including the inlet opening (152) of the shell (34) and a first detection component (140) positioned to be detectable by the sensor (54) in the base module (32). The foundation (62) is adapted for releasable attachment to the base module (32). The foundation (62) includes the outlet opening (96) and a second detection component (236) and a catch tray (220) removably seated in the foundation (62) adjacent the outlet opening (96) to receive bone chips discharged therethrough. The base module is configured to selectively power the milling element (170) of the milling module (60) based on whether the sensor (54) in the base module (32) detects that the first and second detection components (140, 236) are arranged relative to each other indicating that the lid (126) is correctly attached to the foundation (62), the catch tray (220) is correctly seated in the foundation (62), and the foundation (62) is correctly attached to the base module (32).