The present invention is a filter bag comprising: an annular body that can be sewn to the lower half of the cardia for receiving a food group entering the cardia； a bag body located below the annular body and having a funnel shape The food group is taken over； and a sticky opening is located at the end of the bag for the group to enter the esophagus.本案係一種濾袋，其包括：一環形體，可縫合於賁門之下半部上，可供承接進入該賁門之食團；一袋身，係位於該環形體之下方且呈漏斗狀，可供承接該食團；以及一沾黏式開口，係位於該袋身之末端，可供該食團進入食道中。
