A medical device including, e.g., an implantable medical lead or drug pump catheter, a guide member, or a sheath is delivered to a target location within a patient via a catheter capable of subselecting vessels or other cavities, passages, or the like within the patient's body. The catheter employs an inflatable member that, when actuated, acts to deflect a medical device to direct the device into a vessel or other cavity, passage, or the like branching off of, e.g., a vessel in which the catheter is arranged. In some examples, the inflatable member acts to deflect the delivery catheter, which in turn necessarily deflects the implantable medical device arranged therein. In other examples, the inflatable member acts to deflect the medical device to turn the device into a vessel or other cavity, passage, or the like branching off of the vessel in which the catheter is arranged.