in fig1 , an endoscope and a suture unit used in this embodiment are shown . an endoscope 1 ( flexible endoscope ) has an endoscope operation unit 2 which is operated by an operator . the endoscope operation unit 2 is connected to a control device via a universal cable 3 and equipped with various switches 4 and angle knobs 5 . at the tip of the endoscope operation unit 2 , an endoscope insertion part 6 that is flexible and long is extendedly formed . at the tip of the endoscope insertion part 6 , an observation device 7 for obtaining an image of the internal body , a lighting unit 8 , and a tip opening of a channel 9 are provided . as the observation device 7 , an imaging device having a ccd ( charge coupled device ) or an optical fiber can be used . the lighting unit 8 has an optical fiber that conducts light from a light source . the channel 9 opens at a lateral part 2 a of the endoscope operation unit 2 through the endoscope insertion part 6 . at an opening of the lateral part 2 a , a cap 10 is provided . in the cap 10 , an insertion hole is formed , and a treatment instrument such as a suture unit 11 is inserted into the channel 9 through this insertion hole . as shown in fig1 to 3 , in the suture unit 11 , a flexible inner sheath 13 is passed through the inside of a flexible outer sheath 12 so as to be able to freely move . to the tip of the inner sheath 13 , a needle 14 is fixed . the needle 14 has a slit 15 formed in a longitudinal direction from the tip thereof . a suture instrument 16 is contained inside of the needle 14 . each of the lengths of the outer sheath 12 and the inner sheath 13 is longer than that of the channel 9 of the endoscope 1 . at a proximal end of the inner sheath 13 , an operation unit 17 is provided . the operation unit 17 has a handle 19 which can freely slide with respect to a main body 18 of the operation unit . to the handle 19 , a proximal end of a pusher 20 is fixed . the pusher 20 extends through the inside of the inner sheath 13 to the inside of the needle 14 . a distal end portion 21 of the pusher 20 is pressed against the suture instrument 16 . as shown in fig4 , the suture instrument 16 has a suture thread 25 . the suture thread 25 is folded approximately in two and a knot 31 is formed in the vicinity of its turn - around point . moreover , the suture thread 25 is bundled at both end portions ( a first end portion and a second end portion ) thereof and passed through a stopper 26 that is substantially triangular . to each of the first end portion and the second end portion of the suture thread 25 , an anchor 27 is fixed . the anchor 27 has a cylindrical shape and the suture thread 25 is fixed at an approximately center portion in a longitudinal direction of the anchor 27 . both end portions of two anchors 27 in their longitudinal direction are respectively polarized . one end portion 27 a of the anchor 27 becomes a south pole of a magnet , and the other end portion 27 b becomes a north pole of the magnet . in fig4 , the end portion 27 a of the south pole and the end portion 27 b of the north pole are distinguished by using different colors so as to allow visual distinction . however , the end portions 27 a and 27 b and other portions may not be distinguished by using different colors . the stopper 26 includes a long , thin plate member in which a hole 28 is formed at the center portion in a longitudinal direction thereof , through which the suture thread 25 is passed . both end portions 29 in a longitudinal direction of the stopper 26 are diagonally folded back to hold the suture thread 25 therebetween . both end portions 29 in a longitudinal direction of the stopper 26 are cut to form triangular sections 30 . both end portions 29 of the stopper 26 are diagonally folded back so that the sections 30 intersect with each other to hold the suture thread 25 therebetween . as a result , the suture thread 25 is prevented from passing through a space formed between end portions 29 . when the knot 31 of the suture thread 25 is pulled in a direction away from the stopper 26 , both end portions 29 of the stopper 26 are slightly opened . accordingly , the stopper 26 allows the suture thread 26 to move in the same direction . on the other hand , when end portions of the suture thread 25 at the side of the anchors 27 are pulled , the suture thread 25 is ready to move in a direction shown by an arrow in fig4 . at this time , however , the suture thread 25 does not move , since both end portions 29 of the stopper 26 are closed and secure the suture thread 25 . as shown in fig3 , the suture instrument 16 sequentially holds two anchors 27 in an inner hole of the needle 14 . the suture thread 25 is drawn out from the slit 15 of the needle 14 . as shown in fig2 , the stopper 26 is held at a more distal end portion than the needle 14 in the outer sheath 12 . the number of the anchors 27 and the shape of the stopper 26 are not limited to the embodiment shown in the figures . next , a suturing method of this embodiment will be explained mainly with reference to fig5 to 14 . fig5 to 12 are pattern diagrams illustrating manipulation and show the stomach as an example of a hollow organ . as shown in fig5 , the endoscope insertion part 6 is inserted from the mouth ( a natural opening of a living body , such as the anus , nose , or ear ) of a patient 41 prepared with a mouthpiece 40 . the tip of the endoscope insertion part 6 is bent by the angle knob 5 . a needle - like knife that is a high - frequency incision tool is passed through the channel 9 of the endoscope insertion part 6 , and a perforation is formed by incising the tissue of the wall of the stomach 43 . as shown in fig6 , the endoscope insertion part 6 is directed to the abdominal cavity 53 through the perforation 52 formed in the stomach 43 . a forceps 54 is passed through the channel 9 , and the treatment in the abdominal cavity 53 is carried out by using the forceps 54 . after finishing the treatment , the endoscope insertion part 6 is drawn back to the inside of the stomach 43 . when the perforation 52 is sutured , the suture unit 11 is passed through the channel 9 of the endoscope insertion part 6 , and the needle 14 of the suture unit 11 is projected from the outer sheath 12 . at this time , the stopper 26 falls to the stomach 43 . when the suture unit 11 is moved forward , the needle 14 is thrust into the tissue around the perforation 52 ( inside of the stomach 43 ). when the tip portion of the needle 14 penetrates the tissue and projects to the abdominal cavity 53 side , the forward movement of the suture unit 11 is stopped . the handle 19 ( see fig1 ) of the operation unit 17 is manipulated to move the pusher 20 forward . as shown in fig7 , the first anchor 27 ( the first connection member ) is pushed out to the abdominal cavity 53 . when the needle 14 is pulled out from the tissue , the anchor 27 is placed in the abdominal cavity 53 . the suture thread 25 penetrates the tissue in the wall of the stomach 43 . next , the needle 14 is thrust again in the same direction ( direction toward the abdominal cavity 43 from the inside of the stomach 43 ) at an approximately symmetrical position across the perforation 52 with respect to the position at which the needle 14 is thrust to place the first anchor 27 . when the tip of the needle 14 penetrates the tissue and projects to the abdominal cavity 53 side , the second anchor 27 the second connection member ) is pushed out . as shown in fig8 , the second anchor 27 ( the second connection member ) is placed at an approximately symmetrical position across the perforation 52 with respect to the position at which the first anchor 27 is placed . since the two anchors 27 have the end portions 27 a and 27 b which are polarized , one end portion 27 a of the first anchor 27 and the other end portion 27 b of the second anchor 27 attract each other . in the same way , one end portion 27 b of the first anchor 27 and the other end portion 27 a of the second anchor 27 attract each other . accordingly , as shown in fig9 , the two anchors 27 attach to each other before closing the perforation 52 . since the thrust positions are near , the two anchors 27 adhere parallel to each other . by attachment of the two anchors 27 , both end portions of the suture thread 25 are connected via these anchors 27 . after the suture instrument 16 is mounted on the wall so as to cross the perforation 52 , the suture instrument 16 is tightened up . in order to tighten up the suture instrument 16 , a forceps 62 shown in fig1 , for example , is used . the forceps 60 includes an outer sheath 61 having an external diameter larger than the anchor 27 and an inner sheath 62 passing through the inside of the outer sheath 61 so as to be able to freely move forward or backward . at the tip of the inner sheath 62 , a supporting member 63 is provided , and a pair of grip segments 64 are supported on the supporting member 63 so as to be able to freely open or close . after the knot 31 of the suture thread 25 of the suture instrument 16 is gripped by the grip segments 64 , the outer sheath 61 is moved forward to press the tip of the outer sheath 61 against the stopper 26 . as shown in fig1 , when the outer sheath 61 is moved further forward , the stopper 26 is pushed into the wall of the stomach 43 . since the stopper 26 is constructed to be able to move in this direction , the stopper 26 moves toward the wall . since the position of the pair of the grip segments 64 does not change , the stopper 26 moves relatively forward with respect to the suture thread 25 . as a result , the distance between the stopper 26 and the anchor 27 decreases , and the suture thread 25 is gathered . this pulls together the tissue around the perforation 52 as shown in fig1 and 13 , and the perforation 52 is sutured by the suture thread 25 . after the perforation 52 is sutured by the suture instrument 16 , the outer sheath 61 is moved backward , and then the grip segments 64 are opened to release the suture thread 25 . although the tip of the stopper 26 can move in a direction in which the tissue is tightened up by the suture thread 25 , it acts to tighten up the suture thread 25 in a direction for loosening the suture thread 25 . as a result , the suture thread 25 is not loosened , even if the suture instrument 16 is placed inside of the stomach 43 . as shown in fig1 , when the two anchors 27 attach parallel to each other , the tissue around the perforation 52 is collapsed , and the diameter of a loop of the suture thread 25 decreases . on the contrary , as shown in fig1 , when one end portion 27 a of the first anchor 27 and the other end portion 27 b of the second anchor 27 serially and attach to each other , the distance between the suture thread 25 penetrating the tissue increases . the diameter of the loop of the suture thread 25 formed via the anchor 27 increases . in this embodiment , since a pair of the anchors 27 of the suture instrument 16 are polarized so as to pull together , the anchors 27 approach each other , and attach to each other when suturing the perforation 52 . since anchors of a suture instrument of the prior art are completely independent and attitude or position thereof cannot be controlled , the tissue around the perforation is unevenly pulled and tends to leave a gap . according to this embodiment , since the anchors 27 attach to each other , the unevenness of the tissue is prevented and the tissue around the perforation formed in the stomach 43 can close neatly . thus , the perforation 52 is properly closed . when the anchors 27 attach parallel to each other , the attached area is large , and thereby a high engagement strength can be achieved . moreover , since the anchors 27 are parallel to a line of closure formed due to the close contact with the inner edges of the perforation 52 , the perforation 52 can be more properly closed . since the suture thread 25 forms a closed loop via the anchors 27 that attach to each other due to a magnetic force , it is possible to bring the inside and the outside of both sides of the tissue across the perforation 52 closely . accordingly , as in the case of surgical suturing , suturing can be properly carried out . the diameter of the loop of the suture thread 25 can be controlled in accordance with a way of attaching the anchors 27 . when the diameter of the loop is desired to be enlarged , the anchors 27 may be attached parallel to each other . when the diameter of the loop of the suture thread 25 is desired to be diminished , the anchors 27 may be closely and linearly attached to each other . another aspect of the anchor 27 is shown in fig1 to 17 . anchors 70 as shown in fig1 are connection members respectively provided at the first and the second end portions of the suture thread 25 and divided in two perpendicularly in a longitudinal direction . one portion 70 a of the connection member divided in two becomes a south pole and the other portion 70 b becomes a north pole . since the attached area due to a magnetic force is large , it becomes easy for the anchors to attach to each other . the anchors 71 as shown in fig1 are connection members respectively provided at the first and the second end portions of the suture thread 25 and divided in two parallel to a longitudinal direction . one portion 71 a of the connection member divided in two becomes a south pole and the other portion 71 b becomes a north pole . as shown in fig1 , a first anchor 72 is a first connection member provided at the first end portion of the suture thread 25 and produced from a magnet . a second anchor 73 is a second connection member provided at the second end portion of the suture thread 25 and produced from a ferromagnet . as the ferromagnet , pure iron , permalloy , or the like is used . the anchor 73 attaches to the anchor 72 due to the magnetic force of the anchor 72 , and both end portions of the suture thread 25 are connected via these anchors 72 and 73 . when only the anchor 72 is a magnet , the same effect as described above can be achieved . these anchors 27 , 70 , 71 , 72 , and 73 may have a cross section of which the shape is a circle or an oval , or a cross section of which the shape is a polygon such as a tetragon . in this embodiment , the same endoscope 1 and suture unit 11 as in the first embodiment are used . descriptions that overlap with the first embodiment will be omitted . as shown in fig1 , a suture instrument 80 is equipped with a ring 81 at the first end portion of the suture thread 25 . the ring 81 is a first connection member having a hole . at the second end portion of the suture thread 25 , a tag 82 that is a second connection member is provided . the thickness of the tag 82 is of a size which allows it to be inserted into the inside of the ring 81 . the length of the tag 82 is larger than the external diameter of the ring 81 . the ring 81 and the tag 82 can be contained inside of the needle 14 . for this reason , the ring 81 and the tag 82 are made from a material having flexibility and are held in the needle 14 in a folded form . the ring 81 and the tag 82 may be produced so as to be in a size smaller than the inner diameter of the needle 14 . as shown in fig5 , the endoscope i is directed to the stomach 43 . as shown in fig6 , the endoscope insertion part 6 enters the abdominal cavity 53 through the perforation 52 . by using the forceps 54 passed through the endoscope insertion part 6 , the treatment is carried out in the abdominal cavity 53 . when the perforation 52 is sutured , the suture unit 11 is used . as shown in fig1 , after the needle 14 of the suture unit 11 penetrates the tissue around the perforation 52 from the inside of the stomach 43 toward the abdominal cavity 53 , the pusher 20 is moved forward , and the ring 81 is pushed out from the needle 14 . when the ring 82 is pushed out , the needle 14 is drawn back to be pulled out from the tissue . moreover , the needle 14 penetrates at an approximately symmetrical position across the perforation 52 in the same direction as for placing the ring 81 , that is , from the inside of the stomach 43 toward the abdominal cavity 53 . the pusher 20 is moved further forward . from the needle 14 , the tag 82 is pushed out to the abdominal cavity 53 side . when the tag 82 is pushed out , the needle 14 is pulled out from the wall . as shown in fig2 , the forceps 54 is passed through the channel 9 of the endoscope 1 . the forceps 54 is directed through the perforation 52 to the abdominal cavity 53 , and grips the tag 82 in the abdominal cavity 53 . this tag 82 is inserted inside of the ring 81 . as shown in fig2 , the ring 81 is engaged with the tag 82 , and both end portions of the suture thread 25 are connected to each other via the ring 81 and the tag 82 . after the forceps 54 is pulled back from the perforation 52 to the stomach 43 , the suture instrument 80 is tightened up . the tightening method is the same as in the first embodiment . a loop of the suture thread 25 is formed to close the perforation 52 . according to this embodiment , since the ring 81 and the tag 82 are respectively provided at the end portion of the suture thread 25 , the loop of the suture thread 25 can be properly formed by engaging the ring 81 with the tag 82 , and thereby the perforation can be properly sutured . next , another embodiment of the suture instrument is shown in fig2 . a suture instrument 85 is equipped with the ring 81 at the first end portion of the suture thread 25 . at the second end portion of the suture thread 25 , a hook 86 is provided as a second connection member . the hook 86 is thinner than the internal diameter of the ring 81 and the tip portion thereof is folded back so as to be able to be engaged with the ring 81 . as shown in fig2 , the ring 81 and the hook 86 of the suture instrument 85 are engaged with each other at the abdominal cavity 53 side . by the ring 81 and the hook 86 , the end portions of the suture thread 25 are connected with each other to form a loop . by this suture instrument 85 , the perforation 52 can be closed in the same manner as with the suture instrument 80 shown in fig2 . moreover , this invention can be widely applied without being limited to the above - mentioned embodiments . the form of the end portion of the suture thread 25 is not limited to a magnet , ring , tag , hook , or the like . after bundling the end portions of the suture thread 25 , the end portions may be engaged with each other by a treatment tool such as a clip , high - frequency forceps , or the like , followed by tightening up the suture thread 25 . the suture thread 25 may be tightened up after the end portions of the suture thread 25 are adhered to each other by using an adhesive agent . the anchors 27 of the first embodiment may be gripped by a treatment tool to force them to attach to each other , followed by tightening up the suture thread 25 . as shown in fig2 , when the endoscope insertion part 6 has two channels 9 , the suture units 11 may be passed individually through respective channels 9 . in this case , the anchors 27 of the suture instrument 16 are individually held in the needle 14 of the respective suture unit 11 . the same can be applied to other types of the anchor .
a method for suturing a perforation formed in a hollow organ comprises the steps of : causing plural end portions of the suture thread to puncture a tissue around the perforation in the same direction as each other ; connecting the end portions of the suture thread to each other ; and tightening up the suture thread after connecting the end portions of the suture thread with each other .