Abstract: Medical devices and methods for making and using medical devices are disclosed. An example medical device may include a guide extension catheter. The guide extension catheter may include an elongate tubular member having a proximal region, a distal region, and a slot formed in the tubular member between the proximal region and the distal region. The proximal region of the tubular member may be configured to shift between a first configuration and a collapsed configuration. The guide extension catheter may also include an elongate shaft for shifting the proximal region between the first configuration and the collapsed configuration.

Abstract: An implantable medical lead including a proximal end portion and a distal end portion and an electrical conductor electrically connected to the proximal end portion of the lead body. Also, the lead has at least one electrode connected to the distal end portion of the lead body and connected to the electrical conductor. The electrode includes a conductive base structure, a first set of pores formed on an outer surface of the conductive base structure, the first set of pores having an average first pore dimension of between about ¼th and about 1/100th an electrode dimension, and a second set of pores formed on at least a portion of the first set of pores, the second set of pores having an average second pore dimension of between about ¼th and about 1/100th average first pore dimension.