A delivery system for delivering an implantable device can include a delivery catheter, a sleeve, and a guide catheter. The delivery catheter can have a tubular body having a proximal end and a distal end, such that the distal end of the delivery catheter is configured to couple to the implantable device. The sleeve can define a lumen configured to receive the delivery catheter and the implantable device coupled thereto. A first fluid delivery port can be positioned on the delivery catheter or the sleeve. A mechanical seal can be coupled to the sleeve and configured to form a liquid-tight seal with the delivery catheter. A guide catheter can have a tubular body having a proximal end, a distal end, and a second fluid delivery port positioned thereon, wherein the proximal end of the guide catheter is configured to be connected to a distal end of the sleeve.