Novel wound occlusion devices (100′) and methods for the acute treatment of massively bleeding external wounds are suggested. The novel devices which are insertable into wounds W are characterised by a base element (12′) a sealing element (3) and a release mechanism of the sealing element (3). The sealing element (3) comprises a frame element (31) and a layer element (32) and is transformable between a contracted and an expanded configuration (3′) by the release mechanism. The sealing element (3) has in the expanded configuration (3′) a shape adaptable to the shape of the wound W and forms a form-locked and/or force-locked connection with the wound W thereby occluding the wound and effectively stopping blood loss.
