A device for removing a stone, a stone fragment or a foreign body from a patient comprising: (i) a suction evacuation assembly which includes a sheath and one or more side arms (50, 60); said sheath having a proximal end and a distal end; (ii) an obturator having a straight or tapered distal end which is inserted into a proximal end of the sheath and which extends beyond the distal end of the sheath and is releasably secured to the proximal end of said sheath; (iii) a side arm emanating from the outer surface of said sheath, wherein said side arm further comprises a pressure regulating mechanism in the form of a longitudinal slit in respect of the axis of the side arm which allows a person using the suction evacuation assembly to increase the negative pressure within the suction evacuation assembly by covering the pressure regulating mechanism or decrease the negative pressure within the suction evacuation assembly by uncovering the pressure regulating mechanism; (iv) optionally, an accessory side arm emanating from the outer surface of said sheath; (v) said sheath having a lumen which is the same diameter as a lumen of said side arm and if present as a lumen of said accessory side arm; (vi) a flexible cap releasably secured to the proximal end of the sheath; (vii) a proximal end of a primary tube releasably secured to said side arm or if present said accessory side arm and a distal end of said primary tube releasably secured to a collection container; and (viii) a proximal end of a secondary tube releasably secured to said collection container and a distal end of said secondary tube releasably secured to a negative pressure system; (ix) wherein said obturator can be withdrawn from said sheath and a scope can be inserted into the sheath through the flexible cap and into said patient in order to visualize said stone or foreign body using said scope; and (x) wherein the negative pressure system can be activated in order to remove said stone or foreign body from said cavity if a diameter of said stone or foreign body is narrower than an inside diameter of said sheath and said side arm, or lithotripsy can be performed on said stone or said foreign body in order to create fragments with a decreased diameter which allow the passage of said fragments within the inside diameter of said sheath and said side arm; and the stone, foreign body and/or fragments can be collected in said collection container. (i) a suction evacuation assembly which includes a sheath and one or more side arms (50, 60); said sheath having a proximal end and a distal end; (ii) an obturator having a straight or tapered distal end which is inserted into a proximal end of the sheath and which extends beyond the distal end of the sheath and is releasably secured to the proximal end of said sheath; (iii) a side arm emanating from the outer surface of said sheath, wherein said side arm further comprises a pressure regulating mechanism in the form of a longitudinal slit in respect of the axis of the side arm which allows a person using the suction evacuation assembly to increase the negative pressure within the suction evacuation assembly by covering the pressure regulating mechanism or decrease the negative pressure within the suction evacuation assembly by uncovering the pressure regulating mechanism; (iv) optionally, an accessory side arm emanating from the outer surface of said sheath; (v) said sheath having a lumen which is the same diameter as a lumen of said side arm and if present as a lumen of said accessory side arm; (vi) a flexible cap releasably secured to the proximal end of the sheath; (vii) a proximal end of a primary tube releasably secured to said side arm or if present said accessory side arm and a distal end of said primary tube releasably secured to a collection container; and (viii) a proximal end of a secondary tube releasably secured to said collection container and a distal end of said secondary tube releasably secured to a negative pressure system; (ix) wherein said obturator can be withdrawn from said sheath and a scope can be inserted into the sheath through the flexible cap and into said patient in order to visualize said stone or foreign body using said scope; and (x) wherein the negative pressure system can be activated in order to remove said stone or foreign body from said cavity if a diameter of said stone or foreign body is narrower than an inside diameter of said sheath and said side arm, or lithotripsy can be performed on said stone or said foreign body in order to create fragments with a decreased diameter which allow the passage of said fragments within the inside diameter of said sheath and said side arm; and the stone, foreign body and/or fragments can be collected in said collection container.