To produce the medical apparatus and the medical apparatus, a method of using are disclosed. An example of a medical device includes a guide extension catheter. The guide extension catheter includes a proximal member having a proximal outer diameter. Removable stiffening member is disposed in proximity to the proximal member. The distal sheath member is attached to the proximal member. The distal sheath member has a distal outer diameter greater than the proximal outer diameter.医療装置及びこの医療装置を製造し、利用する方法が開示される。医療装置の一例はガイド拡張カテーテルを含む。前記ガイド拡張カテーテルは近位外径を有する近位部材を含む。取外し可能な補強部材は前記近位部材に近接するように配置される。遠位シース部材は前記近位部材に取り付けられる。前記遠位シース部材は前記近位外径より大きい遠位外径を有する。
