MEDICAL AND SURGICAL APPARATUS, NAMELY, FLUIDJET DEVICES COMPRISING HYDROSURGERY HANDPIECES, CONNECTING TUBING, FLUID PUMPS, AND CONTROL AND POWER CONSOLES, AND STRUCTURAL PARTS THEREFOR, USED FOR TOPICAL OR INVASIVE USE, NAMELY, FOR THE TREATMENT OF THE SPINE, CUTTING, RESECTING, AND ABLATING HARD AND SOFT TISSUE