Abstract: In certain examples, aspects are directed to an ablation tool or other procedure-specific tool to treat or assess biological tissue (e.g., ablate cardiac tissue) having a first tissue side and a second, opposite tissue side at which a magnetic-draw element is to be located. In a specific example, a first magnetic element is associated with or coupled to a catheter tool having an expandable portion to transition from a first state towards a second state for providing an expanded girth, so that the expandable portion surrounds the first magnetic element and moves the procedure-specific tool, in part by the first magnetic element moving via magnetic attraction. While the first magnetic element and the magnetic-draw element align on either side of the biological tissue, the procedure-specific tool may be used for the procedure.

Abstract: In specific examples, aspects are directed towards an inner lumen which is at least partially moveable and/or slidable relative an outer lumen. The inner lumen is allowed to extend outside the outer lumen while the outer lumen remains stationary in a relative position to or outside the target tissue site. The inner lumen may then use a gas or liquid to cause a decrease in temperature as it expands with a sudden drop in pressure. This cools the target tissue sufficiently to cryoablate portions of the tissue at various depth.