The distal half (the distal 30-35 cm) of coronary<unk> s are coated with slippery (lubricious) materials to reduce the friction of the<unk>  as it crosses the blockage in the coronary artery and to also facilitate the passage and delivery of intracoronary devices down the artery.  As the<unk> becomes more slippery or lubricious, the tactile sensation may be reduced.  The reduction in the tactile sensation associated with more lubricious<unk>  may limit the operator's  awareness that the wire has perforated the vessel wall.
Guidewire coatings
Median sternotomy
Balloon catheter
Guidewire prowater
Stent
Surgical suture
Pericardial window
TAVR imaging