Thread trimming device for foramen ovale suturing instrument

The utility model provides a thread trimming device for a foramen ovale suturing instrument, and belongs to the technical field of foramen ovale suturing operations. Thread trimming is inconvenient in the prior art. Comprising a sewing head and a thread cutter, the sewing head comprises an outer tube, a swing rod and two needle tubes, a driving rod is arranged in the outer tube, two penetrating channels are symmetrically formed in the two ends of the swing rod, sewing buckles are arranged in the two penetrating channels, a pull thread is connected to the middle of a connecting line, and push rods are arranged in the two needle tubes. The ends, away from the inserting tip ends, of the two needle tubes are connected with first push rods used for pushing the two needle tubes into the two penetrating channels correspondingly, and the two push rods are connected with second push rods used for driving the two push rods to stretch out of the two needle tubes correspondingly. The thread trimmer comprises a thread tri