An atherectomy device for removing occlusive material from a subject, the atherectomy device comprising: a distal cutter assembly, comprising: a housing; a cutting element carried by the housing and comprising at least one cutting blade, the cutting element being rotatable relative to the housing to cause the at least one cutting blade to cut the occlusive material and move the occlusive material into the housing; a catheter coupled to the distal cutter assembly, the catheter comprising: a sheath configured to receive the occlusive material from the housing; a drive shaft disposed within the sheath and coupled to the cutting element, the drive shaft being rotatable relative to the sheath to rotate the cutting element relative to the housing, the drive shaft comprising: an inner coil comprising an inner lumen; an outer conveyor disposed outwardly from the inner coil, the outer conveyor configured to proximally move the occlusive material in a material removal passageway disposed between the drive shaft and the sheath upon rotation of the drive shaft relative to the sheath; and a sealing layer disposed between the inner coil and the outer conveyor, the sealing layer configured to inhibit the occlusive material in the material removal passageway from passing through the inner coil and entering the inner lumen. a distal cutter assembly, comprising: a housing; a cutting element carried by the housing and comprising at least one cutting blade, the cutting element being rotatable relative to the housing to cause the at least one cutting blade to cut the occlusive material and move the occlusive material into the housing; a housing; a cutting element carried by the housing and comprising at least one cutting blade, the cutting element being rotatable relative to the housing to cause the at least one cutting blade to cut the occlusive material and move the occlusive material into the housing; a catheter coupled to the distal cutter assembly, the catheter comprising: a sheath configured to receive the occlusive material from the housing; a drive shaft disposed within the sheath and coupled to the cutting element, the drive shaft being rotatable relative to the sheath to rotate the cutting element relative to the housing, the drive shaft comprising: an inner coil comprising an inner lumen; an outer conveyor disposed outwardly from the inner coil, the outer conveyor configured to proximally move the occlusive material in a material removal passageway disposed between the drive shaft and the sheath upon rotation of the drive shaft relative to the sheath; and a sealing layer disposed between the inner coil and the outer conveyor, the sealing layer configured to inhibit the occlusive material in the material removal passageway from passing through the inner coil and entering the inner lumen. a sheath configured to receive the occlusive material from the housing; a drive shaft disposed within the sheath and coupled to the cutting element, the drive shaft being rotatable relative to the sheath to rotate the cutting element relative to the housing, the drive shaft comprising: an inner coil comprising an inner lumen; an outer conveyor disposed outwardly from the inner coil, the outer conveyor configured to proximally move the occlusive material in a material removal passageway disposed between the drive shaft and the sheath upon rotation of the drive shaft relative to the sheath; and a sealing layer disposed between the inner coil and the outer conveyor, the sealing layer configured to inhibit the occlusive material in the material removal passageway from passing through the inner coil and entering the inner lumen. an inner coil comprising an inner lumen; an outer conveyor disposed outwardly from the inner coil, the outer conveyor configured to proximally move the occlusive material in a material removal passageway disposed between the drive shaft and the sheath upon rotation of the drive shaft relative to the sheath; and a sealing layer disposed between the inner coil and the outer conveyor, the sealing layer configured to inhibit the occlusive material in the material removal passageway from passing through the inner coil and entering the inner lumen.