Seal for use with medical device and system

A permanently implantable intravenous lead capable of pacing the heart, comprising:

• a permanently implantable elongated, flexible body member made of an electrically insulative material, said body member having a proximal end portion and a distal end portion;
• a lumen extending through the body member from the proximal end portion to the distal end portion of the body member;
• a conductive member extending through the body member from the proximal end portion toward the distal end portion;
• and
• a sealing assembly located at a distal end portion of the lead, the sealing assembly including
• a seal coupling element having a passage coaxial with the lumen and extending through the seal coupling element, the passage and lumen configured to allow for implantation of the lead over a guidewire and having a proximal portion received within the body member, and
• a sealing element coupled to the seal coupling element.

A permanently implantable intravenous lead capable of pacing the heart, comprising:

• a permanently implantable elongated, flexible body member made of an electrically insulative material, said body member having a proximal end portion and a distal end portion;
• a lumen extending through the body member from the proximal end portion to the distal end portion of the body member;
• a conductive member extending through the body member from the proximal end portion toward the distal end portion, said conductive member comprising a helical coil portion;
• and
• a sealing assembly coupled to a distal end portion of the lead, the sealing assembly including a proximal portion located within an inner diameter of the helical coil portion, a distal portion, a passage coaxial with the lumen and extending through the sealing assembly, the passage and lumen configured to allow for implantation of the lead over a guidewire, and a sealing element located at the distal portion of the sealing assembly and configured to limit bodily fluid from entering the lumen.