Patent ID: 7625354

Claim:
A medication infusion system comprising: a drive unit having a receptacle and being configured to apply pressure in a range of 200 psi to 650 psi, to a hand piece assembly for delivering medication to a body; a disposable handpiece assembly detachably connected to the drive unit, the handpiece assembly comprising: a cartridge holder being configured for disposal of a medication cartridge, the cartridge holder having an end for receiving a medication cartridge, the end of the cartridge holder having a plurality of wings and being connected with the receptacle of the medication infusion system by an interference fit of the wings inside the receptacle; microbore tubing having a first end and a second end, the first end being fixedly sealed by bonding that is impermeable to leakage with the cartridge holder such that the cartridge holder facilitates communication between the tubing and the medication cartridge; a needle assembly with a needle for injecting a patient's tissue; a handpiece being fixedly sealed by bonding that is impermeable to leakage with the needle assembly and by bonding that is impermeable to leakage with the second end of the tubing such that the tubing and the needle assembly are in communication; the wings of the cartridge holder being connected to the end of the cartridge holder at wing junctions that have a reduced wall thickness configured for structural failure, such that the wing junctions break at a predetermined threshold in the range of 450 to 550 psi, as applied to the handpiece assembly from the medication infusion system, such that the interference fit between the wings and the receptacle fails at the predetermined pressure threshold and thereby disconnects the cartridge holder from the drive unit so that the drive unit can no longer apply any pressure to the handpiece assembly.