US Patent 9849014 Medical device delivery

A stent delivery assembly can include a stent, a tube, a shaft slidably disposed within the tube, and an engagement member on the shaft. The engagement member is operable via the shaft so as to facilitate manipulation of the stent via the shaft. The engagement member can engage the stent inner wall and cooperating with the tube to grip the stent. The shaft is arranged within the tube with a close tolerance between the shaft and the tube so as to provide stability during retraction or advancement of the shaft.