Acetabular reamer connection mechanism

A reaming system for reaming the acetabulum comprising:

• a hollow handle;
• a drive shaft mounted within said hollow handle;
• a reamer coupling head mounted on said drive shaft at an end thereof, said reamer head having a body with an outwardly open groove extending thereacross for receiving a radially extending mounting rod on an acetabular reamer and a bore extending through said body in communication with said groove;
• a spring biased lock pin slidably mounted in the bore of said reamer head body, said lock pin having a recess thereon for receiving the mounting rod, a spring biasing said lock pin into a first position wherein said lock pin recess is aligned with the groove in said reamer head body, the lock pin recess having a surface thereon engagable with said mounting rod for moving said lock pin against said spring into a second position upon insertion of said rod in said outwardly open groove wherein at least a part of said recess is not aligned with said groove to lock said mounting rod within said recess and said lock pin having a stop surface extending beyond a periphery of said head portion;
• a spring biased locking collar mounted on said drive shaft surrounding said head and moveable with respect to said head in an axial direction of said shaft, said lock collar having a stop surface thereon for engaging said stop surface on said lock pin, said lock collar spring-biased into a position where said stop surface thereon engages said stop surface on said lock pin to hold said lock collar in a retracted position when said lock pin is in said first position.