Patent ID: 8480632

Claim:
A cartridge assembly for delivering a quantity of medication to bone marrow of a bone comprising: a fluid reservoir having a first end and a second end; a hollow, bone penetrating needle engaged with the first end of the fluid reservoir; a plunger assembly including a piston and a plunger shaft attached to the piston; the piston slidably disposed in the fluid reservoir; a portion of the plunger shaft extending from the second end of the fluid reservoir; a drive connector attached to the second end of the fluid reservoir opposite from the bone penetrating needle; and the drive connector operable to rotate the cartridge assembly in response to rotation of the drive connector by an associated drive housing; where the cartridge assembly is configured to be removably coupled to a driver such that if the needle is disposed in a bone of a patient: (i) the cartridge assembly can be removed from the driver, and (ii) the needle can be disengaged from the reservoir.