Patent ID: 6863658

Claim:
In a system comprising a microprocessor-controlled transfer device and a separate catheter for intraluminal treatment of a selected site in a body of a patient by at least one treating element advanced from a removable treating element cartridge received in the transfer device into a lumen of the separate catheter by means of pressurized fluid controlled by a fluid control switch moveable between send and return positions, a safety interlock for preventing both the disassembly of the system unless the treating element resides in the treating element cartridge and the actuation of the fluid control switch unless the system is assembled, the safety interlock comprising: a first lock removeable from a first position to a second position only if both the catheter and treating element cartridge are secured to the transfer device, the first lock blocking movement of the fluid control switch to the send position when in the first position and preventing disassembly of either the catheter or the treating element cartridge from the transfer device when in the second position, the fluid control switch further locking the first lock in its second position when the fluid control switch is in the send position.