Patent ID: 7553318

Claim:
A fluid jet device for producing a fluid jet, comprising: a housing; a pump set arranged in said housing, said pump set including a differential piston pump operable to produce a high liquid pressure for removing biological tissue; a pressure supplying source separate from said pump set, and operable to be connected to said differential piston pump of said pump set via a pressure supply line; a nozzle connectable by a flexible connecting line to a high-pressure fluid outlet of said differential piston pump for emitting the fluid jet, said nozzle having a nozzle outlet with a diameter of between 20 micrometers and 120 micrometers; and a pump control system including: a control valve in said pressure supply line; a pressure relief valve at said high-pressure fluid outlet of said differential piston pump, wherein said control valve and said pressure relief valve of said pump control system are operable in unison to control an operation of said differential piston pump; and a two-way valve having an inlet line connected to said pressure supply line upstream of said control valve, said two-way valve further having an outlet line connected to said control valve and said pressure relief valve.