Conduction system pacing leads and methods of manufacturing (snap-fit)

A distal assembly for a lead body, the distal assembly comprising:

• an outer shell having a proximal shell component and a distal shell component;
• a coupler made of an electrically conductive material disposed within the outer shell and comprising a proximal portion having a proximal end and a first channel extending distally from the proximal end and configured to receive a first electrical conductor, and a distal portion opposite the proximal portion, wherein the proximal shell component is mechanically coupled to the proximal portion of the coupler by a first snap-fit connection, and the distal shell component is mechanically coupled to the proximal portion of the coupler by a second snap-fit connection;
• a helical electrode having a proximal portion disposed about the distal portion of the coupler, and a distal portion extending distally from the distal portion of the shell;
• and
• a ring electrode disposed partially over and mechanically coupled to the proximal shell component by a third snap-fit connection.

An implantable lead for use with an implantable medical device (IMD), the implantable lead comprising:

• a tubular lead body having proximal end, a distal end opposite the proximal end, a first lead body lumen extending from the proximal end through the distal end, and a second lead body lumen extending from the proximal end through the distal end;
• a proximal connector at the proximal end of the lead body configured for mechanically and electrically coupling the lead to the IMD;
• a distal assembly extending from the distal end of the lead body, the distal assembly comprising:
• an outer shell having a proximal shell component and a distal shell component;
• a coupler made of an electrically conductive material disposed within the outer shell and comprising a proximal portion and a distal portion opposite the proximal portion, the proximal portion having a proximal end, a first channel extending distally from the proximal end, and a second channel extending distally from the proximal end, wherein the proximal shell component is mechanically coupled to the proximal portion of the coupler by a first snap-fit connection, and the distal shell component is mechanically coupled to the proximal portion of the coupler by a second snap-fit connection;
• and
• a helical electrode having a proximal portion disposed about the distal portion of the coupler, and a distal portion extending distally from the distal portion of the shell;
• a coiled first electrical conductor extending through the first lead body lumen and mechanically and electrically coupled to the coupler within the first channel;
• and
• a stranded cable second conductor extending through the second lead body lumen and mechanically and electrically coupled to the coupler within the second channel.