A transfer sleeve for use with a delivery system for an implantable medical device, the transfer sleeve comprising: a proximal portion defining a proximal channel, wherein: a portion of the proximal portion extends from a central axis of the proximal portion to engage with an edge of an introducer sheath when the delivery system is inserted into the introducer sheath, and the proximal channel has a cross-sectional area that allows a shaft (108, 110) of the delivery system to fit within the proximal channel of the proximal portion; a distal portion defining a distal channel, wherein the distal channel has a cross-section area that allows the shaft of the delivery system to fit within the distal channel of the distal portion; and a body portion coupled between the proximal portion and the distal portion and defining a body channel, wherein: the distal portion and the body portion have exterior diameters that enable the distal portion and the body portion to enter a lumen of the introducer sheath, and the body channel, proximal channel, and distal channel form a fluid tight cavity when the proximal portion is engaged with the shaft of the delivery system and the distal portion is engaged with a capsule. a proximal portion defining a proximal channel, wherein: a portion of the proximal portion extends from a central axis of the proximal portion to engage with an edge of an introducer sheath when the delivery system is inserted into the introducer sheath, and the proximal channel has a cross-sectional area that allows a shaft (108, 110) of the delivery system to fit within the proximal channel of the proximal portion; a distal portion defining a distal channel, wherein the distal channel has a cross-section area that allows the shaft of the delivery system to fit within the distal channel of the distal portion; and a portion of the proximal portion extends from a central axis of the proximal portion to engage with an edge of an introducer sheath when the delivery system is inserted into the introducer sheath, and the proximal channel has a cross-sectional area that allows a shaft (108, 110) of the delivery system to fit within the proximal channel of the proximal portion; a distal portion defining a distal channel, wherein the distal channel has a cross-section area that allows the shaft of the delivery system to fit within the distal channel of the distal portion; and a body portion coupled between the proximal portion and the distal portion and defining a body channel, wherein: the distal portion and the body portion have exterior diameters that enable the distal portion and the body portion to enter a lumen of the introducer sheath, and the body channel, proximal channel, and distal channel form a fluid tight cavity when the proximal portion is engaged with the shaft of the delivery system and the distal portion is engaged with a capsule. the distal portion and the body portion have exterior diameters that enable the distal portion and the body portion to enter a lumen of the introducer sheath, and the body channel, proximal channel, and distal channel form a fluid tight cavity when the proximal portion is engaged with the shaft of the delivery system and the distal portion is engaged with a capsule.