A device for sealing an aperture in a tissue, the device comprising: a. an implant configured to seal the aperture when positioned adjacent to the aperture; and b. a delivery shaft configured to engage the implant to allow the implant to be maneuvered into sealing engagement with a distal surface of the tissue, the delivery shaft comprising: (i) a retaining sleeve comprising a locking projection engagable with a locking recess of the implant to secure the implant to the delivery shaft; (ii) a release sleeve axially slideable relative to the retaining sleeve between a first axial position in which the release sleeve is configured to maintain locking engagement between the locking recess of the implant and the locking projection of the retaining sleeve, and a second axial position in which the release sleeve permits the locking projection of the retaining sleeve to disengage the locking recess of the implant; and (iii) a handle coupled to the delivery shaft, characterized in that said handle comprises (a) a sheath cam moveable between a first position and second position relative to the handle, and (b) a sheath carriage connected to a sheath, wherein the device is configured such that movement of the sheath cam from the first position to the second position by rotation movement causes (x) movement of the sheath carriage relative to the handle, causes (y) the movement of one end of the sheath into the handle, and causes (z) exposure of the implant in the vessel in an atraumatic way. a. an implant configured to seal the aperture when positioned adjacent to the aperture; and b. a delivery shaft configured to engage the implant to allow the implant to be maneuvered into sealing engagement with a distal surface of the tissue, the delivery shaft comprising: (i) a retaining sleeve comprising a locking projection engagable with a locking recess of the implant to secure the implant to the delivery shaft; (ii) a release sleeve axially slideable relative to the retaining sleeve between a first axial position in which the release sleeve is configured to maintain locking engagement between the locking recess of the implant and the locking projection of the retaining sleeve, and a second axial position in which the release sleeve permits the locking projection of the retaining sleeve to disengage the locking recess of the implant; and (iii) a handle coupled to the delivery shaft, characterized in that said handle comprises (a) a sheath cam moveable between a first position and second position relative to the handle, and (b) a sheath carriage connected to a sheath, wherein the device is configured such that movement of the sheath cam from the first position to the second position by rotation movement causes (x) movement of the sheath carriage relative to the handle, causes (y) the movement of one end of the sheath into the handle, and causes (z) exposure of the implant in the vessel in an atraumatic way. (i) a retaining sleeve comprising a locking projection engagable with a locking recess of the implant to secure the implant to the delivery shaft; (ii) a release sleeve axially slideable relative to the retaining sleeve between a first axial position in which the release sleeve is configured to maintain locking engagement between the locking recess of the implant and the locking projection of the retaining sleeve, and a second axial position in which the release sleeve permits the locking projection of the retaining sleeve to disengage the locking recess of the implant; and (iii) a handle coupled to the delivery shaft, characterized in that said handle comprises (a) a sheath cam moveable between a first position and second position relative to the handle, and (b) a sheath carriage connected to a sheath, wherein the device is configured such that movement of the sheath cam from the first position to the second position by rotation movement causes (x) movement of the sheath carriage relative to the handle, causes (y) the movement of one end of the sheath into the handle, and causes (z) exposure of the implant in the vessel in an atraumatic way.