Bilumen guide catheters for accessing cardiac sites

A bilumen guide catheter for introducing a cardiac lead to a desired implantation site, comprising:

• an elongated delivery tube, formed from a first polymeric material having a first durometer, extending from a delivery tube proximal end to a delivery tube distal end and having a delivery tube inner wall spaced a first distance from a delivery tube outer wall, the delivery tube inner wall forming a delivery tube lumen and the delivery tube lumen having an exit port at the delivery tube distal end;
• and
• an elongated guide tube having a length, the length of the guide tube formed from a second polymeric material different from the first polymeric material and having a second durometer greater than the first durometer of the first polymeric material, extending from a guide tube proximal end to a guide tube distal end and having a guide lumen inner wall spaced a second distance from a guide tube outer wall, the guide tube inner wall forming a guide tube lumen having a guide tube lumen exit port at the guide tube distal end, the guide tube outer wall fixedly bonded against the delivery tube outer wall, wherein the distal end of the guide tube is positioned distally from the distal end of the delivery tube,
• the guide tube having a harder surface than the delivery tube.