Figure 1

Illustration of the structure and working principle of the device. (A) The device before insertion into the tubal interstitial portion, like a folded umbrella which minimizes its size in diameter and subsequently facilitates the insertion of the device; (B) The device after the insertion into the interstitial portion, like an unfolded umbrella; (C) Coronal section view, the device is placed at the interstitial portion of the tube, The device is anchored in the right place and the passage through the tube is completely blocked. 1. A semi-soft hat; 2. A waterproof membrane; 3. Guild rod; 4. A small hole; 5. The supporter of the shape memory umbrella; 6. A thin circular rim to cut into the interstitial myometrium for fixation.