A system comprising: a catheter assembly sized and configured to be introduced into a blood vessel, the catheter assembly including: a tissue cutting assembly at or near a distal end of the catheter assembly, the tissue cutting assembly including a rotatable cutter for debulking tissue from the blood vessel; and a deflection segment at or near a distal portion of the catheter assembly, the deflection segment having a length L, a straight axis S, and a deflected axis D; a deflection member coupled to the catheter assembly and adapted to manipulate the deflection segment of the catheter assembly so as to deflect the length L of the deflection segment from the straight axis S to the deflected axis D to create an angle A between the straight axis S and the deflected axis D, the angle having a range between zero degrees and ninety degrees; a control handle coupled to the catheter assembly, the control handle including steering means comprising a deflection control device, coupled to the deflection segment, for steering the tissue cutting assembly, rotating means for rotating the rotatable cutter, power means for providing power to the rotating means, the rotating means adapted to rotate the rotatable cutter, and on/off means for controlling the power to the rotating means; and a torque shaft extending from the rotating means to the rotatable cutter, the torque shaft including aspiration means to move cut tissue from the rotatable cutter through the catheter assembly and through at least a portion of the control handle to a receptacle. a catheter assembly sized and configured to be introduced into a blood vessel, the catheter assembly including: a tissue cutting assembly at or near a distal end of the catheter assembly, the tissue cutting assembly including a rotatable cutter for debulking tissue from the blood vessel; and a deflection segment at or near a distal portion of the catheter assembly, the deflection segment having a length L, a straight axis S, and a deflected axis D; a tissue cutting assembly at or near a distal end of the catheter assembly, the tissue cutting assembly including a rotatable cutter for debulking tissue from the blood vessel; and a deflection segment at or near a distal portion of the catheter assembly, the deflection segment having a length L, a straight axis S, and a deflected axis D; a deflection member coupled to the catheter assembly and adapted to manipulate the deflection segment of the catheter assembly so as to deflect the length L of the deflection segment from the straight axis S to the deflected axis D to create an angle A between the straight axis S and the deflected axis D, the angle having a range between zero degrees and ninety degrees; a control handle coupled to the catheter assembly, the control handle including steering means comprising a deflection control device, coupled to the deflection segment, for steering the tissue cutting assembly, rotating means for rotating the rotatable cutter, power means for providing power to the rotating means, the rotating means adapted to rotate the rotatable cutter, and on/off means for controlling the power to the rotating means; and a torque shaft extending from the rotating means to the rotatable cutter, the torque shaft including aspiration means to move cut tissue from the rotatable cutter through the catheter assembly and through at least a portion of the control handle to a receptacle.