An aspirator configured to move air from a proximal end of the aspirator to a distal end of the aspirator, the aspirator comprising: an aspirator body defining: an annular cavity; a central channel; and an annular slit; wherein fluid communication between the annular cavity and the central channel is via the annular slit, and wherein the aspirator body defines an entrainment opening, and wherein the annular slit circumscribes and is substantially disposed about the entrainment opening, and wherein the annular cavity circumscribes and is substantially disposed about the annular slit, wherein the aspirator body immediately downstream of the annular slit diverges radially outward, and wherein the aspirator body comprises an entrainment section having a radially inward surface that faces and defines the entrainment opening, and wherein a radially outward surface of the entrainment section faces and at least partially defines the annular slit, and wherein: the aspirator body comprises an outer cavity housing; the outer cavity housing transitions to the entrainment section such that a radially inward surface of the outer cavity housing transitions to the radially outward surface of the entrainment section and a radially outward surface of the outer cavity housing transitions to the radially inward surface of the entrainment section; and the radially inward surface of the outer cavity housing faces and at least partially defines the annular cavity. an aspirator body defining: an annular cavity; a central channel; and an annular slit; an annular cavity; a central channel; and an annular slit; wherein fluid communication between the annular cavity and the central channel is via the annular slit, and wherein the aspirator body defines an entrainment opening, and wherein the annular slit circumscribes and is substantially disposed about the entrainment opening, and wherein the annular cavity circumscribes and is substantially disposed about the annular slit, wherein the aspirator body immediately downstream of the annular slit diverges radially outward, and wherein the aspirator body comprises an entrainment section having a radially inward surface that faces and defines the entrainment opening, and wherein a radially outward surface of the entrainment section faces and at least partially defines the annular slit, and wherein: the aspirator body comprises an outer cavity housing; the outer cavity housing transitions to the entrainment section such that a radially inward surface of the outer cavity housing transitions to the radially outward surface of the entrainment section and a radially outward surface of the outer cavity housing transitions to the radially inward surface of the entrainment section; and the radially inward surface of the outer cavity housing faces and at least partially defines the annular cavity. the aspirator body comprises an outer cavity housing; the outer cavity housing transitions to the entrainment section such that a radially inward surface of the outer cavity housing transitions to the radially outward surface of the entrainment section and a radially outward surface of the outer cavity housing transitions to the radially inward surface of the entrainment section; and the radially inward surface of the outer cavity housing faces and at least partially defines the annular cavity.