A loading device for loading a medical device into a catheter, the medical device having a nonexpandable portion and an expandable portion, the latter having an expanded configuration and a collapsed configuration, the loading device (500, 600, 700) comprising: a body (502, 602, 702) having a lumen (504, 604, 704) configured to receive the expandable portion of the medical device, the lumen (504, 604, 704) having a length at least as long as the expandable portion of the medical device when the expandable portion is in the collapsed configuration, the lumen (504, 604, 704) having a diameter that is greater than the collapsed configuration of the medical device, the body (502, 602, 702) comprising a first portion (506, 606, 706) and a second portion (508, 608, 708) that are reversibly separable to expose the lumen (504, 604, 704) in an open configuration and enclose the lumen (504, 604, 704) in a closed configuration, the first portion (506, 606, 706) comprising an inner face (510, 610, 710), and the second portion (508, 608, 708) comprising an inner face (512, 612, 712), wherein the inner face (510, 610, 710) of the first portion (506, 606, 706) has a first groove (514, 614, 714) that defines a first portion of the lumen (504, 604, 704) and the inner face (512, 612, 712) of the second portion (508, 608, 708) has a second groove (516, 616, 716) that defines a second portion of the lumen (504, 604, 704); wherein the body (502, 602, 702) has a distal tip portion (520, 620, 720) that is sized, shaped, and configured to reversibly couple with a hemostatic valve of the catheter such that the lumen (504, 604, 704) of the loading device (500, 600, 700) is aligned with a lumen of the catheter when the distal tip portion (520, 620, 720) is coupled with the hemostatic valve of the catheter, wherein the lumen (504, 604, 704) of the loading device (500, 600, 700) extends through the distal tip portion (520, 620, 720). a body (502, 602, 702) having a lumen (504, 604, 704) configured to receive the expandable portion of the medical device, the lumen (504, 604, 704) having a length at least as long as the expandable portion of the medical device when the expandable portion is in the collapsed configuration, the lumen (504, 604, 704) having a diameter that is greater than the collapsed configuration of the medical device, the body (502, 602, 702) comprising a first portion (506, 606, 706) and a second portion (508, 608, 708) that are reversibly separable to expose the lumen (504, 604, 704) in an open configuration and enclose the lumen (504, 604, 704) in a closed configuration, the first portion (506, 606, 706) comprising an inner face (510, 610, 710), and the second portion (508, 608, 708) comprising an inner face (512, 612, 712), wherein the inner face (510, 610, 710) of the first portion (506, 606, 706) has a first groove (514, 614, 714) that defines a first portion of the lumen (504, 604, 704) and the inner face (512, 612, 712) of the second portion (508, 608, 708) has a second groove (516, 616, 716) that defines a second portion of the lumen (504, 604, 704); wherein the body (502, 602, 702) has a distal tip portion (520, 620, 720) that is sized, shaped, and configured to reversibly couple with a hemostatic valve of the catheter such that the lumen (504, 604, 704) of the loading device (500, 600, 700) is aligned with a lumen of the catheter when the distal tip portion (520, 620, 720) is coupled with the hemostatic valve of the catheter, wherein the lumen (504, 604, 704) of the loading device (500, 600, 700) extends through the distal tip portion (520, 620, 720).