Patent ID: 11950836
Assignee: TERUMO KABUSHIKI KAISHA
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 10:
11. A treatment method of enlarging a through-hole of an atrial septum by using a medical device having an expansion body that is configured to expand and contract in a radial direction and includes a distal side expansion portion and a proximal side expansion portion, the method comprising:
expanding the distal side expansion portion of the expansion body in a radial direction inside a left atrium;
positioning a distal side holding portion of the distal side expansion portion to face a surface on a left atrium side of the atrial septum so as to dispose a movable portion of the expansion body in the through-hole of the atrial septum, the movable portion of the expansion body linking the distal side holding portion and a proximal side holding portion of the proximal side expansion portion and forming a recessed portion with the proximal side holding portion and the distal side holding portion;
expanding the proximal side holding portion in the radial direction inside a right atrium so as to hold the atrial septum from both sides of the through-hole by the recessed portion;
expanding the movable portion, the distal side expansion portion and the proximal side expansion portion in the radial direction with holding the atrial septum from both sides of the through-hole by the recessed portion so as to enlarge a diameter of the through-hole by expanding the expansion body; and
performing a maintenance treatment to the atrial septum held by the recessed portion by using a maintenance treatment element disposed on the recessed portion while the through-hole has been enlarged.