A covered stent
Patent Information
- Application Number
- KR1020250013464
- Authority / Receiving Office
- KR · KR
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-04
- Publication Date
- 2026-08-11
Smart Images
Figure PAT00015_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to a covered stent that maintains the passage of the lumen by expanding a lesion site that is narrowed or obstructed within the body, and in particular, to a covered stent that is easy to operate along the curved lumen between the esophagus and the stomach, the curved lumen between the stomach and the duodenum, and the curved lumen of the large intestine. Background Technology
[0002] Generally, when a lesion site that is stenotic or obstructed occurs in an internal lumen of the human body, such as the bile duct, esophagus, ureter, or large intestine, a problem arises in which the lumen's inherent function as a lumen for transporting body fluids, bile, urine, and food is reduced.
[0003] Therefore, a stent was inserted by procedure into the lumen narrowed by the aforementioned stenotic or occluded lesion area to expand it.
[0004] As shown in FIGS. 1 and 2, the first stent (2) having expansion portions (2d) on both sides is an uncovered stent in which a plurality of intersection portions (2b) are formed by the intersection of wires (2a), and a plurality of space portions (2c) formed between the wires (2a) are exposed. Since the first stent (2) has a strong restoring force due to the intersection portions (2b) and attempts to maintain a straight state, it was difficult to maintain a curved state.
[0005] In this regard, since the stent (10) of Patent Document 1 was also formed by wire crossing or laser cutting, it was difficult to maintain a curved state while having strong restoring force like the first stent (2).
[0006] For this reason, as illustrated in FIGS. 3 to 5, when the first stent (2) is implanted in the curved lumen (1) between the esophagus (3) and the stomach (3a) where the lesion site (1a) occurred, the curved lumen (1) between the stomach (3a) and the duodenum (3b), and the curved lumen (1) of the large intestine (3c), it was difficult for the first stent (2) to maintain a curved state due to a strong restoring force attempting to return to a straight state.
[0007] In addition, since the curved lumen (1) was in strong contact with the first stent (2) attempting to return to a straight state, there was a risk of inflammation occurring, and as the lesion area (1a) was inserted into the space (2c), the passage of the lumen (1) was narrowed.
[0008] In addition, when the stent (10) of the above patent document 1 is implanted in a curved lumen (1), there was a problem in that it was difficult to maintain the curved state due to a strong restoring force attempting to return to a straight state.
[0009] As shown in FIGS. 6 and 7, to complement this, the second stent (4) having expansion portions (4e) on both sides forms a plurality of interlocking portions (4d) and intersecting portions (4b) by weaving or crossing wires (4a) so that they hook onto each other in a hook shape.
[0010] For this reason, the second stent (4) was able to maintain a curved state when implanted in a curved lumen (1) as the restoring force was weakened by the interlocking part (4d).
[0011] However, since the second stent (4) is an uncovered stent in which a plurality of spaces (4c) formed between the wires (4a) are exposed, as shown in FIG. 8, the passage of the lumen (1) is narrowed as the lesion area (1a) is inserted into the spaces (4c).
[0012] For this reason, the second stent (4) had to be used only in a limited way in a curved lumen (1).
[0013] As shown in FIGS. 9 and 10, unlike the first and second stents (2) (4) which are uncovered stents, there was a third stent (5) which is a covered stent to prevent the lesion area (1a) from coming inward.
[0014] The third stent (5), having expansion portions (5e) on both sides, was covered with a PTFE film (6) by PTFE heat bonding and covered the space (5c) formed between the wires (5a).
[0015] However, the intersection (5b) and the interlocking (5d) formed in the third stent (5) were fixed to the PTFE film (6) and could not move, that is, displacement could not occur, and the third stent (5) had strong restoring force due to the PTFE film (6) and tried to maintain a straight state, so it was difficult to maintain a curved state.
[0016] As illustrated in FIGS. 11 and 12, when the third stent (5) is implanted in the curved lumen (1), the third stent (5) prevents the lesion site (1a) from moving inward, but it is difficult to maintain the curved state due to a strong restoring force attempting to return to a straight state, and there is a risk of inflammation occurring because the curved lumen (1) comes into strong contact with the third stent (5) attempting to return to a straight state.
[0017] In addition, the third stent (5) coated on the PTFE film (6) was bent at a curved part of the lumen (1), and there was a risk that the wire would break and be severed at the bent part of the third stent (5) due to prolonged stress.
[0018] The third stent (5) shown in FIGS. 13 and 14 is coated with a silicone film (7) by silicone dipping instead of a PTFE film (6) and is implanted in a curved lumen (1).
[0019] However, the third stent (5) coated on the silicone film (7) also had difficulty maintaining a curved state due to a strong restoring force attempting to return to a straight state, and there was a risk of inflammation occurring because the curved lumen (1) came into strong contact with the third stent (5) attempting to return to a straight state.
[0020] In addition, the third stent (5) coated on the silicone film (7) was bent at a curved part of the lumen (1), and there was a risk that the bent part of the third stent (5) would be severed as the wire broke due to prolonged stress.
[0021] For this reason, the third stent (5), which is the covered stent mentioned above, could only be used in a limited way in a curved lumen (1).
[0022] There is a demand for covered stents that improve upon these conventional problems. Prior art literature
[0023] Patent Document 1: Korean Registered Patent No. 10-1493485 (Registered on Feb. 9, 2015) The problem to be solved
[0024] Accordingly, the present invention aims to provide a covered stent that is easier to operate along a curved lumen than conventional stents, which expands the lesion site that is narrowed or blocked within the lumen to maintain the passage of the lumen and prevents the lesion site from entering the main body of the stent with a PTFE coating.
[0025] In addition, the present invention aims to provide a covered stent that is easier to operate along a curved lumen than conventional stents, by allowing displacement to occur at the interlocking and intersecting portions through the gap space formed between the main body stent and a PTFE coating, so that the main body stent is easily deformed to fit the shape of the curved lumen by the displacement of the interlocking and intersecting portions. means of solving the problem
[0026] To achieve the above-mentioned objective, the present invention comprises a stent comprising: a cylindrical main body stent in which wires made of shape memory alloy are interwoven or crossed to interlock in a hook shape to form multiple interlocking and crossing portions and multiple spaces formed between the wires, for the purpose of expanding a stenotic or obstructed lesion site occurring in a lumen within the body to maintain a passage in the lumen; and expansion portions formed at both ends of the main body stent with a diameter larger than that of the main body stent, wherein a first coating made of PTFE is formed to cover the outer surface of the main body stent; a second coating made of PTFE is formed to cover the outer surface of the expansion portion and the outer surface of both ends of the first coating adjacent to the bend portion of the expansion portion; a third coating made of PTFE is formed to cover the inner surface of the expansion portion and the inner surface of both ends of the main body stent adjacent to the bend portion of the expansion portion, extending longer in the longitudinal direction of the main body stent than the second coating; and the first, second, and third coatings are heat-bonded such that a portion of the first coating not bonded to the second and third coatings and The present invention provides a covered stent that facilitates procedure along a curved lumen, characterized by being configured to form a gap space between the main body stents. Effects of the invention
[0027] The first embodiment of the present invention has the effect of preventing the interior of the main body stent from being blocked by the lesion site because the first coating made of PTFE material covering the outer or inner surface of the main body stent prevents the lesion site from entering the interior of the main body stent.
[0028] For this reason, the covered stent of the present invention has the effect of maintaining the passage of the lumen by expanding the lesion site that is narrowed or blocked in the lumen of the body.
[0029] The first embodiment of the present invention has the effect of causing displacement of the interlocking portion and the intersection portion through the gap space formed between a part of the first coating made of PTFE material free from the main body stent and the main body stent.
[0030] In other words, the main body stent has the effect of providing flexibility through the gap space.
[0031] For this reason, the covered stent of the present invention has the effect of easily deforming to fit the shape of the curved lumen by the displacement of the interlocking portion and the intersection portion, and also has the effect of preventing the phenomenon of bending in the curved portion of the lumen, thereby preventing wire breakage and cutting caused by bending over a long period of time.
[0032] In the first embodiment of the present invention, since the first, second, and third films made of PTFE are bonded and the gaps between the first, second, and third films are sealed, it has the effect of preventing insertion into the lesion site and maintaining the passage of the lumen, as well as the effect of preventing contamination caused by bodily fluids, bile, urine, and food particles passing through the lumen.
[0033] In the first embodiment of the present invention, the ends of the first and fourth films made of PTFE are coated with the fifth film made of silicone, thereby sealing the gap between the first, fourth, and fifth films. This has the effect of preventing insertion into the lesion site and maintaining the passage of the lumen, as well as preventing contamination caused by bodily fluids, bile, urine, and food particles passing through the lumen.
[0034] In the first embodiment of the present invention, since the first, second, and third films of PTFE material are overlapped at the bent portion of the expanded portion to form a thick thickness, it has the effect of preventing the bent portion of the expanded portion from easily bending due to external forces such as shaking of the human body.
[0035] In other words, the expanded section has the effect of continuously maintaining the state of being caught in the lumen.
[0036] For this reason, the covered stent of the present invention has the effect of not sliding out of the lumen due to external forces such as shaking of the human body.
[0037] In the first embodiment of the present invention, since the first and fourth films of PTFE material and the fifth film of silicone material are overlapped at the bent portion of the expanded portion to form a thick thickness, it has the effect of preventing the bent portion of the expanded portion from easily bending due to external forces such as shaking of the human body.
[0038] In other words, the expanded section has the effect of continuously maintaining the state of being caught in the lumen.
[0039] For this reason, the covered stent of the present invention has the effect of not sliding out of the lumen due to external forces such as shaking of the human body.
[0040] In the first embodiment of the present invention, since the expanded portion has a strong restoring force to maintain its original shape due to a fifth film made of a silicone material with good elasticity, the expanded portion has the effect of not being easily compressed by external forces such as shaking of the human body.
[0041] Since the covered stent of the first embodiment of the present invention is formed with an intersection portion of 20% to 80% and an interlocking portion of 80% to 20%, it has the effect of preventing the radial force of the covered stent of the present invention from weakening to the point where it is difficult to maintain a curved state in a curved lumen due to a strong restoring force attempting to return the covered stent of the present invention to a straight state, or being pressed against the lesion site.
[0042] For this reason, the covered stent of the first embodiment of the present invention has the effect of easily deforming to fit a curved lumen while maintaining the passage of the lumen without being compressed at the lesion site.
[0043] The second embodiment of the present invention has the effect of preventing the interior of the main body stent from being blocked by the lesion site because the sixth coating made of PTFE material, which covers the outer or inner surface of the main body stent, prevents the lesion site from entering the interior of the main body stent.
[0044] For this reason, the covered stent of the present invention has the effect of maintaining the passage of the lumen by expanding the lesion site that is narrowed or blocked in the lumen of the body.
[0045] The second embodiment of the present invention has the effect of causing displacement of the interlocking portion and the intersection portion through the gap space formed between a part of the sixth film made of PTFE material free from the main body stent and the main body stent.
[0046] In other words, the main body stent has the effect of providing flexibility through the gap space.
[0047] For this reason, the covered stent of the present invention has the effect of easily deforming to fit the shape of the curved lumen by the displacement of the interlocking portion and the intersection portion, and also has the effect of preventing the phenomenon of bending in the curved portion of the lumen, thereby preventing wire breakage and cutting caused by bending over a long period of time.
[0048] In the second embodiment of the present invention, since the gap between the 6th and 7th films made of PTFE is sealed by bonding them, it has the effect of preventing insertion into the lesion site and maintaining the passage of the lumen, as well as the effect of preventing contamination caused by bodily fluids, bile, urine, and food particles passing through the lumen.
[0049] In the second embodiment of the present invention, since the silicone film 8 and the PTFE film 9 are bonded to the PTFE film 6 and the gap between the 6, 8, and 9 films is sealed, it has the effect of preventing insertion into the lesion site and maintaining the passage of the lumen, as well as the effect of preventing contamination caused by bodily fluids, bile, urine, and food particles passing through the lumen.
[0050] In the second embodiment of the present invention, since an eighth film made of a silicone material with good elasticity is formed on the bent portion of the expanded portion and both ends of the main body stent, it has the effect of preventing the bent portion of the expanded portion from easily bending due to external force.
[0051] In other words, the expanded section has the effect of continuously maintaining the state of being caught in the lumen.
[0052] For this reason, the covered stent of the present invention has the effect of not sliding out of the lumen due to external forces such as shaking of the human body.
[0053] In the second embodiment of the present invention, since the expanded portion has a strong restoring force to maintain its original shape due to the eighth film made of a silicone material with good elasticity, the expanded portion has the effect of not being easily compressed by external forces such as shaking of the human body.
[0054] Since the covered stent of the second embodiment of the present invention is formed with an intersection portion of 20% to 80% and an overlapping portion of 80% to 20%, it has the effect of preventing the radial force of the covered stent of the present invention from weakening to the point where it is difficult to maintain a curved state in a curved lumen due to a strong restoring force attempting to return the covered stent to a straight state, or being pressed against the lesion site.
[0055] For this reason, the covered stent of the second embodiment of the present invention has the effect of easily deforming to fit a curved lumen while maintaining the passage of the lumen without being compressed at the lesion site. Brief explanation of the drawing
[0056] FIGS. 1 to 5 are a front view, enlarged view, and surgical state view of a conventional first stent, FIGS. 6 to 8 are a front view, enlarged view, and surgical state view of a conventional second stent, FIGS. 9 to 11 are a front view, enlarged view, and surgical state view of a conventional third stent coated with a PTFE film, FIG. 12 is a partial photograph of the curved state of the actual conventional third stent manufactured according to FIG. 11. FIG. 13 is a diagram of a conventional third stent procedure covered with a silicone film, FIG. 14 is a photograph of the curved state of the actual conventional third stent manufactured according to FIG. 13. FIG. 15 is a front view of a covered stent according to a first embodiment of the present invention, FIGS. 16 to 19 are partial enlarged views of a covered stent according to a first embodiment of the present invention, FIG. 20 is a cross-sectional view of a covered stent according to a first embodiment of the present invention, FIGS. 21 to 23 illustrate the process of forming the first, second, and third films of a covered stent according to the first embodiment of the present invention, FIG. 24 is a photograph of a curved state of an actual covered stent according to the first embodiment of the present invention. FIGS. 25 to 27 are surgical state diagrams in which a covered stent according to the first embodiment of the present invention is implanted in a curved lumen. FIGS. 28 to 30 are magnified views of the surgical state of a covered stent according to the first embodiment of the present invention. FIG. 31 is a surgical state diagram in which a covered stent according to the first embodiment of the present invention is implanted in a straight lumen. FIG. 32 is a front view of a covered stent according to a first modified example of a first embodiment of the present invention, FIG. 33 is a partial enlarged view of a covered stent according to a first modified example of the first embodiment of the present invention, FIGS. 34 to 36 illustrate the process of forming the first, second, and third films of a covered stent according to a first modified example of the first embodiment of the present invention, FIG. 37 is a partial enlarged view of the surgical state of a covered stent according to a first modified example of the first embodiment of the present invention, FIG. 38 is a front view of a covered stent according to a second modified example of the first embodiment of the present invention, FIG. 39 is a partial enlarged view of a covered stent according to a second modified example of the first embodiment of the present invention, FIGS. 40 and 41 illustrate the process of forming the first, fourth, and fifth films of a covered stent according to a second modified example of the first embodiment of the present invention, FIG. 42 is a surgical state diagram in which a covered stent according to a second modified example of the first embodiment of the present invention is implanted in a curved lumen. FIG. 43 is a front view of a covered stent according to a third modified example of the first embodiment of the present invention, FIGS. 44 and 45 illustrate the process of forming the first, fourth, and fifth films of a covered stent according to a third modified example of the first embodiment of the present invention, FIG. 46 is a partial enlarged view of the surgical state of a covered stent according to a third modified example of the first embodiment of the present invention, FIG. 47 is a front view of a covered stent according to a second embodiment of the present invention, FIGS. 48 to 50 are partial enlarged views of a covered stent according to a second embodiment of the present invention, FIG. 51 is a cross-sectional view of a covered stent according to a second embodiment of the present invention, FIGS. 52 and 53 illustrate the process of forming the 6th and 7th films of a covered stent according to the second embodiment of the present invention, FIGS. 54 to 56 are surgical state diagrams in which a covered stent according to a second embodiment of the present invention is implanted in a curved lumen. FIGS. 57 and 58 are magnified views of the surgical state of a covered stent according to a second embodiment of the present invention. FIG. 59 is a front view of a covered stent according to a first modified example of a second embodiment of the present invention, FIG. 60 is a partial enlarged view of a covered stent according to a first modified example of a second embodiment of the present invention, FIGS. 61 and 62 illustrate the process of forming the 6th and 7th films of a covered stent according to a first modified example of the second embodiment of the present invention, FIG. 63 is a partial enlarged view of the surgical state of a covered stent according to the first modified example of the second embodiment of the present invention, FIG. 64 is a front view of a covered stent according to a second modified example of a second embodiment of the present invention, FIG. 65 is a partial enlarged view of a covered stent according to a second modified example of a second embodiment of the present invention, FIGS. 66 and 67 illustrate the process of forming the 6th and 7th films of a covered stent according to a second modified example of the second embodiment of the present invention, FIG. 68 is a surgical state diagram in which a covered stent according to a second modified example of the second embodiment of the present invention is implanted in a curved lumen. FIG. 69 is a front view of a covered stent according to a third modified example of a second embodiment of the present invention, FIG. 70 is a partial enlarged view of a covered stent according to a third modified example of the second embodiment of the present invention, FIGS. 71 and 72 illustrate the process of forming the 6th and 7th films of a covered stent according to a third modified example of the second embodiment of the present invention, FIG. 73 is a partial enlarged view of the surgical state of a covered stent according to a third modified example of the second embodiment of the present invention. Specific details for implementing the invention
[0057] Accordingly, an embodiment of the present invention as described above will be explained in detail with reference to the attached drawings as follows.
[0058] As illustrated in FIGS. 15 to 31, a covered stent (1000) according to the first embodiment of the present invention is inserted into a lumen (1) inside the body, such as a bile duct, esophagus, ureter, or large intestine, by a stent delivery system such as a catheter, and is used to expand a lesion area (1a) that is stenotic or obstructed in the lumen (1) to maintain the passage of the lumen (1).
[0059] The above covered stent (1000) includes a main body stent (100), an expanded portion (150), first, second, and third coatings (200) (210) (220) made of PTFE (polytetrafluoroethylene) material, and a gap space (300).
[0060] The above main body stent (100) is formed in a cylinder shape in which wires (110) made of shape memory alloy are interwoven or crossed to form hooks, thereby forming a plurality of interlocking portions (120) and crossing portions (130), and a plurality of space portions (140) are formed between the wires (110).
[0061] The above-mentioned expansion portion (150) is formed at both ends of the main body stent (100) such that its diameter is larger than that of the main body stent (100).
[0062] Here, the expansion portion (150) and the main body stent (100) are connected by a bent portion (151) formed at the end of the expansion portion (150).
[0063] The first film (200) made of the above PTFE material is formed to cover the outer surface of the main body stent (100).
[0064] Here, the first film (200) may be made of PTFE tape and formed in a spiral shape or a ring shape on the outer surface of the main body stent (100) so that an overlapping portion is formed between them.
[0065] The second film (210) made of the above PTFE material is formed to cover the outer surface of the expanded portion (150) and the outer surface of both ends (201) of the first film (200) adjacent to the bent portion (151) of the expanded portion (150).
[0066] Here, the second film (210) is made of PTFE tape and can be formed in a spiral shape or a ring shape on the outer surface of the expansion portion (150) and the outer surface of both ends (201) of the first film (200) so that an overlapping portion is formed between them.
[0067] The third film (220) made of the above PTFE material is formed to cover the inner surface of the expanded portion (150) and the inner surface of both ends (160) of the main body stent (100) adjacent to the bent portion (151) of the expanded portion (150), and is extended longer in the longitudinal direction of the main body stent (100) than the second film (210).
[0068] Here, the third film (220) is made of PTFE tape and may be formed in a spiral shape or a ring shape on the inner surface of the expansion portion (150), the inner surface of both ends (160) of the main body stent (100), and on both inner surfaces of the main body stent (100) adjacent to the inner surfaces of both ends (160), so that an overlapping portion is formed between them.
[0069] The above first, second, and third films (200)(210)(220) are heat-bonded.
[0070] Here, the interlocking portion (120) and the intersection portion (130) located on the bonded first, second, and third films (200) (210) (220) are fixed to the first, second, and third films (200) (210) (220), so they are in a non-free state where displacement cannot occur.
[0071] And, the above space (140) is not exposed to the outside by the first, second, and third films (200)(210)(220).
[0072] And, in the bent portion (151) of the above-mentioned expansion portion (150), the overlapping portion of the first, second, and third films (200)(210)(220) has a thicker thickness than the non-overlapping portion of the first, second, and third films (200)(210)(220).
[0073] And, the gap between the first, second, and third films (200)(210)(220) is sealed as the first, second, and third films (200)(210)(220) adhere to each other.
[0074] The above gap space (300) is formed between a part of the first film (200) that is not adhered to the second and third films (210) (220) and the main body stent (100).
[0075] That is, the gap space (300) is formed between the part of the first film (200) that is not adhered to the second and third films (210) (220) and the outer surface of the main body stent (100) by loosening the part of the first film (200) that is not adhered to the second and third films (210) (220).
[0076] Here, the interlocking part (120) and the intersection part (130) located in the gap space (300) are not fixed to the first film (200) by the gap space (300), so they are in a free state where displacement can occur.
[0077] The above-mentioned intersection portion (130) is formed in the covered stent (1000) at 20% to 80%, and the cross-section portion (120) is formed in the covered stent (1000) at 80% to 20%.
[0078] The reason is that when the above-mentioned intersection (130) is formed at 80% or more in the covered stent (1000), that is, the main body stent (100) and the expansion portion (150), and the cross-section (120) is formed at 20% or less in the covered stent (1000), that is, the main body stent (100) and the expansion portion (150), the covered stent (1000) has a strong restoring force due to the intersection (130) formed at 80% or more and tries to maintain a straight state, so it was difficult to maintain a curved state.
[0079] Therefore, when a covered stent (1000) in which the above-mentioned intersection portion (130) is formed at 80% or more and the cross-section portion (120) is formed at 20% or less is implanted in a curved lumen (1), it was difficult to maintain the curved state because of the strong restoring force of the covered stent (1000) trying to return to a straight state.
[0080] In addition, a part of the main body stent (100) located in the curved part of the above lumen (1) was subjected to stress for a long time, and there was a risk that the wire (110) would break due to the sustained stress.
[0081] And, when the above-mentioned intersection (130) is formed in the covered stent (1000) at 20% or less and the cross-section (120) is formed in the covered stent (1000) at 80% or more, the covering stent (1000) is easier to maintain in a curved state as the restoring force attempting to return to a straight state is weakened by the cross-section (120) formed at 80% or more, but instead the radial force is weakened.
[0082] So, when a covered stent (1000) in which the above-mentioned intersection portion (130) is formed at 20% or less and the cross-section portion (120) is formed at 80% or more is implanted in a curved lumen (1), the covered stent (1000) was easy to deform to fit the curved lumen (1), but the passage of the lumen (1) was narrowed as it was pressed against the lesion site (1a) due to the weakened radial force.
[0083] For this reason, the above-mentioned intersection portion (130) is formed in the covered stent (1000) at 20% to 80%, and the cross-section portion (120) is formed in the covered stent (1000) at 80% to 20%.
[0084] Ideally, the above-mentioned intersection (130) and the cross-section (120) are each formed in 50% of the covered stent (1000).
[0085] The above expansion portion (150) may be equipped with a pull cord used when removing the covered stent (1000).
[0086] The operation of the covered stent (1000) according to the first embodiment of the present invention is described as follows.
[0087] As illustrated in FIGS. 15 to 31, the covered stent (1000) is implanted in a curved lumen (1) by means of an endoscope that confirms the location to be implanted and a stent delivery system that implants it at the location to be implanted.
[0088] That is, the covered stent (1000) is implanted in the curved lumen (1) of the portion connecting the esophagus (3) and the stomach (3a), the curved lumen (1) of the portion connecting the stomach (3a) and the duodenum (3b), and the curved lumen (1) of the portion connecting the large intestine (3c), as shown in FIGS. 25 to 27.
[0089] Then, since the interlocking part (120) and the intersection part (130) located in the gap space (300) are not fixed to the first film (200) by the gap space (300), displacement occurs in correspondence with the curved inner cavity (1).
[0090] In addition, the shape of the above space portion (140) is also deformed by the displacement of the interlocking portion (120) and the intersection portion (130).
[0091] For this reason, as illustrated in FIGS. 24 to 27, the covered stent (1000) is easily deformed into a curved shape to fit the curved lumen (1), thereby expanding the lesion area (1a) and maintaining the passage of the lumen (1).
[0092] In addition, the covered stent (1000) is not bent at the curved portion of the lumen (1) and is easily deformed into a curved shape to fit the curved lumen (1).
[0093] And, the expanded portion (150) of the covered stent (1000) is inserted into the lumen (1) and secured.
[0094] And, in the bent portion (151) of the expanded portion (150), the overlapping portion of the first, second, and third films (200) (210) (220) is thicker than the non-overlapping portion of the first, second, and third films (200) (210) (220), so the bent portion (151) of the expanded portion (150) is prevented from easily bending due to external forces such as shaking of the human body.
[0095] And, the first, second, and third coatings (200)(210)(220) made of the above PTFE material prevent the lesion area (1a) from being inserted into the interior of the covered stent (1000).
[0096] And, since the gap between the first, second, and third films (200)(210)(220) is sealed as the first, second, and third films (200)(210)(220) adhere, the lesion area (1a) is prevented from being inserted into the interior of the covered stent (1000).
[0097] As illustrated in FIG. 31, the covered stent (1000) can be implanted in a straight lumen (1) by means of an endoscope that identifies the location to be implanted and a stent delivery system that implants at the location to be implanted.
[0098] Then, the covered stent (1000) expands the lesion area (1a) in the straight lumen (1), and the expansion portion (150) is inserted into the lumen (1) and caught.
[0099] As illustrated in FIGS. 32 to 37, the first coating (200) of the covered stent (1000) according to the first modified example of the first embodiment of the present invention is formed to cover the inner surface of the main body stent (100).
[0100] The third film (220) is formed to cover the inner surface of the expanded portion (150) and the inner surface of both ends (201) of the first film (200).
[0101] The second film (210) is formed to cover the outer surface of the expansion portion (150) and the outer surface of both ends (160) of the main body stent (100), and extends longer in the longitudinal direction of the main body stent (100) than the third film (220).
[0102] Therefore, when the first, second, and third films (200)(210)(220) are heat-bonded, the gap space (300) is formed between the part of the first film (200) that is not bonded to the second and third films (210)(220) and the main body stent (100).
[0103] Here, the gap space (300) is formed between a portion of the first film (200) that is not adhered to the second and third films (210) (220) and the inner surface of the main body stent (100).
[0104] And, the space portion (140) located in the gap space (300) is exposed to the outside.
[0105] Thus, when the above-mentioned covered stent (1000) is implanted in the curved lumen (1), the lesion area (1a) is inserted into the space (140) located in the gap space (300).
[0106] For this reason, the space portion (140) of the covered stent (1000) is placed over the inserted lesion site (1a).
[0107] As illustrated in FIGS. 38 to 42, the covered stent (1000) according to the second modified embodiment of the first embodiment of the present invention excludes the second and third coatings (210) (220) and includes a fourth coating (230) made of PTFE (polytetrafluoroethylene) material and a fifth coating (400) made of silicone material.
[0108] The fourth film (230) made of the above PTFE material is heat-bonded to the first film (200) by covering the inner surfaces of both ends (160) of the main body stent (100) and the inner surfaces of the main body stent (100) adjacent thereto.
[0109] Here, the fourth film (230) is made of PTFE tape and may be formed in a spiral shape or a ring shape on the inner surface of both ends (160) of the main body stent (100) and on both sides of the inner surface of the main body stent (100) adjacent thereto, so that an overlapping portion is formed between them.
[0110] And, the above space (140) is not exposed to the outside by the first and fourth films (200) (230).
[0111] And, since the interlocking part (120) and the intersection part (130) located on the bonded first and fourth films (200) (230) are fixed to the first and fourth films (200) (230), they become in a non-free state where displacement cannot occur.
[0112] The above gap space (300) is formed between a part of the first film (200) that is not adhered to the fourth film (230) and the main body stent (100).
[0113] That is, the gap space (300) is formed between the part of the first film (200) that is not adhered to the fourth film (230) and the outer surface of the main body stent (100) by loosening the part of the first film (200) that is not adhered to the fourth film (230).
[0114] Here, the interlocking part (120) and the intersection part (130) located in the gap space (300) are not fixed to the first film (200) by the gap space (300), so they are in a free state where displacement can occur.
[0115] The above fifth film (400) covers the expanded portion (150), one end portion (231) of the fourth film (230) adjacent to the bent portion (151) of the expanded portion (150), and both ends (201) of the first film (200) with silicone dipping.
[0116] Here, the interlocking portion (120) and the intersection portion (130) of the expansion portion (150) are fixed to the fifth film (400), so they are in a restricted state where displacement cannot occur, and the space portion (140) of the expansion portion (150) is not exposed to the outside by the fifth film (400).
[0117] And, in the bent portion (151) of the above-mentioned expansion portion (150), the overlapping portion of the first, fourth, and fifth films (200)(230)(400) has a thicker thickness than the non-overlapping portion of the first, fourth, and fifth films (200)(230)(400).
[0118] And, the gap between the first, fourth, and fifth films (200)(230)(400) is sealed as the ends (201)(231) of the bonded first and fourth films (200)(230) are covered by the fifth film (400) made of silicone material.
[0119] Therefore, when the covered stent (1000) is implanted in the curved lumen (1), the interlocking portion (120) and the intersection portion (130) located in the gap space (300) are not fixed to the first membrane (200) by the gap space (300), so displacement occurs in correspondence with the curved lumen (1).
[0120] In addition, the shape of the above space portion (140) is also deformed by the displacement of the interlocking portion (120) and the intersection portion (130).
[0121] For this reason, as shown in FIG. 42, the covered stent (1000) is easily deformed into a curved shape to fit the curved lumen (1), thereby expanding the lesion area (1a) and maintaining the passage of the lumen (1).
[0122] In addition, the covered stent (1000) is not bent at the curved portion of the lumen (1) and is easily deformed into a curved shape to fit the curved lumen (1).
[0123] And, the expanded portion (150) of the covered stent (1000) is inserted into the lumen (1) and secured.
[0124] In addition, the above-mentioned expansion portion (150) is covered with a fifth film (400) made of a highly elastic silicone material and has a strong restoring force to maintain its original shape, so it is not easily compressed by external forces such as shaking of the human body.
[0125] And, in the bent portion (151) of the expanded portion (150), the overlapping portion of the first, fourth, and fifth films (200)(230)(400) is thicker than the non-overlapping portion of the first, fourth, and fifth films (200)(230)(400), so the bent portion (151) of the expanded portion (150) is prevented from easily bending due to external forces such as shaking of the human body.
[0126] And, the first and fourth films (200) (230) made of PTFE material and the fifth film (400) made of silicone material prevent the lesion area (1a) from being inserted into the interior of the covered stent (1000).
[0127] And, the gap between the first, fourth, and fifth films (200)(230)(400) is sealed as the ends (201)(231) of the bonded first and fourth films (200)(230) are covered by the fifth film (400) made of silicone material, thereby preventing the lesion area (1a) from being inserted into the interior of the covered stent (1000).
[0128] As illustrated in FIGS. 43 to 46, the covered stent (1000) according to the third variant of the first embodiment of the present invention is configured to be almost the same as the second variant, differing only in the location where the first and fourth coatings (200) (230) of the second variant are installed.
[0129] The first film (200) is formed to cover the inner surface of the main body stent (100).
[0130] The above-mentioned fourth film (230) is formed to cover the outer surface of both ends (160) of the main body stent (100) and each of the two adjacent outer surfaces of the main body stent (100).
[0131] Therefore, when the first and fourth films (200) (230) are heat-bonded, the gap space (300) is formed between the part of the first film (200) that is not bonded to the fourth film (230) and the main body stent (100).
[0132] Here, the gap space (300) is formed between a portion of the first film (200) that is not adhered to the fourth film (230) and the inner surface of the main body stent (100).
[0133] And, the space portion (140) located in the gap space (300) is exposed to the outside.
[0134] The above fifth film (400) covers the expanded portion (150), one end portion (231) of the above fourth film (230), and both ends (201) of the above first film (200) with silicone dipping.
[0135] Thus, when the above-mentioned covered stent (1000) is implanted in the curved lumen (1), the lesion area (1a) is inserted into the space (140) located in the gap space (300).
[0136] For this reason, the space portion (140) of the covered stent (1000) is placed over the inserted lesion site (1a).
[0137] As illustrated in FIGS. 47 to 58, the covered stent (1000) according to the second embodiment of the present invention is inserted into a lumen (1) inside the body, such as the bile duct, esophagus, ureter, or large intestine, by a stent delivery system such as a catheter, and is used to expand a lesion area (1a) that is stenotic or obstructed in the lumen (1) to maintain the passage of the lumen (1).
[0138] The above covered stent (1000) includes a main body stent (100), an expanded portion (150), a sixth and seventh coating (240) (250) made of PTFE (polytetrafluoroethylene) material, and a gap space (300).
[0139] The above main body stent (100) is formed in a cylinder shape in which wires (110) made of shape memory alloy are interwoven or crossed to form hooks, thereby forming a plurality of interlocking portions (120) and crossing portions (130), and a plurality of space portions (140) are formed between the wires (110).
[0140] The above-mentioned expansion portion (150) is formed at both ends of the main body stent (100) such that its diameter is larger than that of the main body stent (100).
[0141] Here, the expansion portion (150) and the main body stent (100) are connected by a bent portion (151) formed at the end of the expansion portion (150).
[0142] The sixth film (240) made of the above PTFE material is formed to cover the outer surface of the main body stent (100) and the outer surface of the expansion portion (150).
[0143] Here, the sixth film (240) is made of PTFE tape and can be formed in a spiral shape or a ring shape on the outer surface of the main body stent (100) and the outer surface of the expansion portion (150) so that an overlapping portion is formed between them.
[0144] The seventh film (250) made of the above PTFE material is formed to cover the inner surface of the expansion portion (150), the inner surface of both ends (160) of the main body stent (100) adjacent to the bend portion (151) of the expansion portion (150), and the inner surfaces of the main body stent (100) adjacent thereto.
[0145] Here, the seventh film (250) is made of PTFE tape and may be formed in a spiral shape or a ring shape on the inner surface of the expansion portion (150), the inner surface of both ends (160) of the main body stent (100), and on both sides of the inner surface of the main body stent (100) adjacent thereto, so that an overlapping portion is formed between them.
[0146] The above 6th and 7th films (240) (250) are bonded.
[0147] Here, the interlocking portion (120) and the intersection portion (130) located on the adhesive 6th and 7th films (240) (250) are fixed to the 6th and 7th films (240) (250), so they are in a non-free state where displacement cannot occur.
[0148] And, the above space (140) is not exposed to the outside by the 6th and 7th films (200)(210)(220).
[0149] And, the gap between the 6th and 7th films (240) (250) is sealed as the 6th and 7th films (240) (250) adhere to each other.
[0150] The above gap space (300) is formed between a part of the sixth film (240) that is not adhered to the seventh film (250) and the main body stent (100).
[0151] That is, the gap space (300) is formed between the part of the sixth film (240) that is not adhered to the seventh film (250) and the outer surface of the main body stent (100) by loosening the part of the sixth film (240) that is not adhered to the seventh film (250).
[0152] Here, the interlocking part (120) and the intersection part (130) located in the gap space (300) are not fixed to the sixth film (240) by the gap space (300), so they are in a free state where displacement can occur.
[0153] The above-mentioned intersection portion (130) is formed in the covered stent (1000) at 20% to 80%, and the cross-section portion (120) is formed in the covered stent (1000) at 80% to 20%.
[0154] The reason is that when the above-mentioned intersection (130) is formed at 80% or more in the covered stent (1000), that is, the main body stent (100) and the expansion portion (150), and the cross-section (120) is formed at 20% or less in the covered stent (1000), that is, the main body stent (100) and the expansion portion (150), the covered stent (1000) has a strong restoring force due to the intersection (130) formed at 80% or more and tries to maintain a straight state, so it was difficult to maintain a curved state.
[0155] Therefore, when a covered stent (1000) in which the above-mentioned intersection portion (130) is formed at 80% or more and the cross-section portion (120) is formed at 20% or less is implanted in a curved lumen (1), it was difficult to maintain the curved state because of the strong restoring force of the covered stent (1000) trying to return to a straight state.
[0156] In addition, a part of the main body stent (100) located in the curved part of the above lumen (1) was subjected to stress for a long time, and there was a risk that the wire (110) would break due to the sustained stress.
[0157] And, when the above-mentioned intersection (130) is formed in the covered stent (1000) at 20% or less and the cross-section (120) is formed in the covered stent (1000) at 80% or more, the covering stent (1000) is easier to maintain in a curved state as the restoring force attempting to return to a straight state is weakened by the cross-section (120) formed at 80% or more, but instead the radial force is weakened.
[0158] So, when a covered stent (1000) in which the above-mentioned intersection portion (130) is formed at 20% or less and the cross-section portion (120) is formed at 80% or more is implanted in a curved lumen (1), the covered stent (1000) was easy to deform to fit the curved lumen (1), but the passage of the lumen (1) was narrowed as it was pressed against the lesion site (1a) due to the weakened radial force.
[0159] For this reason, the above-mentioned intersection portion (130) is formed in the covered stent (1000) at 20% to 80%, and the cross-section portion (120) is formed in the covered stent (1000) at 80% to 20%.
[0160] Ideally, the above-mentioned intersection (130) and the cross-section (120) are each formed in 50% of the covered stent (1000).
[0161] The above expansion portion (150) may be equipped with a pull cord used when removing the covered stent (1000).
[0162] The operation of the covered stent (1000) according to the second embodiment of the present invention is described as follows.
[0163] As illustrated in FIGS. 47 to 58, the covered stent (1000) is implanted in a curved lumen (1) by means of an endoscope that confirms the location to be implanted and a stent delivery system that implants it at the location to be implanted.
[0164] That is, the covered stent (1000) is implanted in the curved lumen (1) of the portion connecting the esophagus (3) and the stomach (3a), the curved lumen (1) of the portion connecting the stomach (3a) and the duodenum (3b), and the curved lumen (1) of the portion connecting the large intestine (3c), as shown in FIGS. 54 to 56.
[0165] Then, since the interlocking part (120) and the intersection part (130) located in the gap space (300) are not fixed to the sixth film (240) by the gap space (300), displacement occurs in correspondence with the curved inner cavity (1).
[0166] In addition, the shape of the above space portion (140) is also deformed by the displacement of the interlocking portion (120) and the intersection portion (130).
[0167] For this reason, as illustrated in FIGS. 54 to 56, the covered stent (1000) is easily deformed into a curved shape to fit the curved lumen (1), thereby expanding the lesion area (1a) and maintaining the passage of the lumen (1).
[0168] In addition, the covered stent (1000) is not bent at the curved portion of the lumen (1) and is easily deformed into a curved shape to fit the curved lumen (1).
[0169] And, the expanded portion (150) of the covered stent (1000) is inserted into the lumen (1) and secured.
[0170] And, the 6th and 7th coatings (240) (250) made of the above PTFE material prevent the lesion area (1a) from being inserted into the interior of the covered stent (1000).
[0171] And, since the gap between the 6th and 7th films (240) (250) is sealed as the 6th and 7th films (240) (250) adhere, the lesion area (1a) is prevented from being inserted into the interior of the covered stent (1000).
[0172] Meanwhile, the above-mentioned covered stent (1000) can be implanted in a straight lumen (1) by means of an endoscope that confirms the location to be implanted and a stent delivery system that implants at the location to be implanted.
[0173] Then, the covered stent (1000) expands the lesion area (1a) in the straight lumen (1), and the expansion portion (150) is inserted into the lumen (1) and caught.
[0174] As illustrated in FIGS. 59 to 63, the sixth film (240) of the covered stent (1000) according to the first modified example of the second embodiment of the present invention is formed to cover the inner surface of the main body stent (100) and the inner surface of the expansion portion (150).
[0175] The above seventh film (250) is formed to cover the outer surface of the expansion portion (150), the outer surface of both ends (160) of the main body stent (100), and each of the outer surfaces of the main body stent (100) adjacent thereto.
[0176] Therefore, when the 6th and 7th films (240) (250) are bonded, the gap space (300) is formed between the part of the 6th film (240) that is not bonded to the 7th film (250) and the main body stent (100).
[0177] Here, the gap space (300) is formed between a portion of the sixth film (240) that is not adhered to the seventh film (250) and the inner surface of the main body stent (100).
[0178] And, the space portion (140) located in the gap space (300) is exposed to the outside.
[0179] Thus, when the above-mentioned covered stent (1000) is implanted in the curved lumen (1), the lesion area (1a) is inserted into the space (140) located in the gap space (300).
[0180] For this reason, the space portion (140) of the covered stent (1000) is placed over the inserted lesion site (1a).
[0181] As illustrated in FIGS. 64 to 68, the covered stent (1000) according to the second modified embodiment of the second embodiment of the present invention excludes the seventh film (250) and includes an eighth film (410) made of silicone material and a ninth film (260) made of PTFE (polytetrafluoroethylene).
[0182] The eighth film (410) made of the above silicone material covers the inner surface of the expanded portion (150) and the inner surface of both ends (160) of the main body stent (100) adjacent to the bent portion (151) of the expanded portion (150), and is adhered to the sixth film (240).
[0183] The ninth film (260) made of the above PTFE material covers both inner surfaces of the main body stent (100) adjacent to the inner surfaces of both ends (160) of the main body stent (100) and adheres to the sixth film (240).
[0184] Here, the ninth film (260) is made of PTFE tape and may be formed in a spiral shape or a ring shape on both inner surfaces of the main body stent (100) that are adjacent to the inner surfaces of both ends (160) of the main body stent (100) so that an overlapping portion is formed between them.
[0185] And, the above space (140) is not exposed to the outside by the 6th, 8th, and 9th coatings (240) (410) (260).
[0186] And, the interlocking part (120) and the intersection part (130) located on the adhesive 6th, 8th, and 9th films (240) (410) (260) are fixed to the 6th, 8th, and 9th films (240) (410) (260), so they are in a non-free state where displacement cannot occur.
[0187] The above gap space (300) is formed between a part of the 6th film (240) that is not adhered to the 8th and 9th films (410) (260) and the main body stent (100).
[0188] That is, the gap space (300) is formed between the part of the 6th film (240) that is not adhered to the 8th and 9th films (410) (260) and the outer surface of the main body stent (100) by loosening the part of the 6th film (240) that is not adhered to the 8th and 9th films (410) (260).
[0189] Here, the interlocking part (120) and the intersection part (130) located in the gap space (300) are not fixed to the sixth film (240) by the gap space (300), so they are in a free state where displacement can occur.
[0190] And, the gap between the 6th, 8th, and 9th films (240)(410)(260) is sealed by the bonded 6th, 8th, and 9th films (240)(410)(260).
[0191] Therefore, when the covered stent (1000) is implanted in the curved lumen (1), the interlocking portion (120) and the intersection portion (130) located in the gap space (300) are not fixed to the sixth membrane (240) by the gap space (300), so displacement occurs in correspondence with the curved lumen (1).
[0192] In addition, the shape of the above space portion (140) is also deformed by the displacement of the interlocking portion (120) and the intersection portion (130).
[0193] For this reason, as illustrated in FIG. 68, the covered stent (1000) is easily deformed into a curved shape to fit the curved lumen (1), thereby expanding the lesion area (1a) and maintaining the passage of the lumen (1).
[0194] In addition, the covered stent (1000) is not bent at the curved portion of the lumen (1) and is easily deformed into a curved shape to fit the curved lumen (1).
[0195] And, since the eighth film (410) made of the above silicone material is formed on the bent portion (151) of the expansion portion (150) and on both ends (160) of the main body stent (100), it prevents the bent portion (151) of the expansion portion (150) from bending due to external force.
[0196] And, the expanded portion (150) of the covered stent (1000) is inserted into the lumen (1) and secured.
[0197] Also, the above-mentioned expansion portion (150) has a strong restoring force to maintain its original shape due to the eighth film (410) made of a highly elastic silicone material, so it is not easily compressed by external forces such as shaking of the human body.
[0198] And, the 6th and 9th coatings (240) (260) made of PTFE material and the 8th coating (410) made of silicone material prevent the lesion area (1a) from being inserted into the interior of the covered stent (1000).
[0199] And, since the gap between the 6th, 8th, and 9th coatings (240)(410)(260) is sealed by the bonded 6th, 8th, and 9th coatings (240)(410)(260), the lesion area (1a) is prevented from being inserted into the interior of the covered stent (1000).
[0200] As illustrated in FIGS. 69 to 73, the covered stent (1000) according to the third variant of the second embodiment of the present invention is configured to be almost the same as the second variant, differing only in the location where the 6th, 8th, and 9th coatings (240) (410) (260) of the second variant are installed.
[0201] The above-mentioned sixth film (240) is formed to cover the inner surface of the main body stent (100) and the inner surface of the expansion portion (150).
[0202] The eighth film (410) is formed to cover the outer surface of the expanded portion (150) and the outer surface of both ends (160) of the main body stent (100) adjacent to the bent portion (151) of the expanded portion (150).
[0203] The ninth film (260) is formed to cover each of the outer surfaces of the main body stent (100) that are adjacent to each of the outer surfaces of the two end portions (160) of the main body stent (100).
[0204] Therefore, when the 6th, 8th, and 9th films (240) (410) (260) are heat-bonded, the gap space (300) is formed between the part of the 6th film (240) that is not bonded to the 8th and 9th films (410) (260) and the main body stent (100).
[0205] Here, the gap space (300) is formed between a portion of the 6th film (240) that is not adhered to the 8th and 9th films (410) (260) and the inner surface of the main body stent (100).
[0206] And, the space portion (140) located in the gap space (300) is exposed to the outside.
[0207] Thus, when the above-mentioned covered stent (1000) is implanted in the curved lumen (1), the lesion area (1a) is inserted into the space (140) located in the gap space (300).
[0208] For this reason, the space portion (140) of the covered stent (1000) is placed over the inserted lesion site (1a).
[0209] Although the present invention has been illustrated and described above with reference to specific preferred embodiments, the present invention is not limited to the embodiments described above, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the invention. Explanation of the symbols
[0210] 100: Main body stent 110: Wire 120 : Overlapping section 130 : Intersecting section 140 : Space section 150 : Expansion section 151 : Bent section 160 : End section 200: First film 201: End part 210: Second coating 220: Third coating 230: 4th film 231: End part 240: 6th Coat 250: 7th Coat 260 : 9th coating 300 : Gap space 400: 5th coating 410: 8th coating 1000 : Covered Stent
Claims
Claim 1 In order to expand a lesion area (1a) that is narrowed or blocked and to maintain the passage of the lumen (1) by expanding the lumen (1) inside the body, a cylindrical main body stent (100) in which wires (110) made of shape memory alloy are interwoven or crossed to form a plurality of interlocking portions (120) and crossing portions (130) so as to be hooked together, and a plurality of space portions (140) are formed between the wires (110), and an expansion portion (150) formed at both ends of the main body stent (100) so as to have a larger diameter than the main body stent (100), wherein a first coating (200) made of PTFE (polytetrafluoroethylene) is formed to cover the outer surface of the main body stent (100), and a second coating (210) made of PTFE (polytetrafluoroethylene) is formed on the outer surface of the expansion portion (150) and the A first film (200) is formed to cover the outer surface of both ends (201) of the first film (200) adjacent to the bent portion (151) of the expanded portion (150), and a third film (220) made of PTFE (polytetrafluoroethylene) is formed to cover the inner surface of the expanded portion (150) and the inner surface of both ends (160) of the main body stent (100) adjacent to the bent portion (151) of the expanded portion (150), extending longer in the longitudinal direction of the main body stent (100) than the second film (210), and the first, second, and third films (200) (210) (220) are heat-bonded to form a gap space (300) between the part of the first film (200) that is not bonded to the second and third films (210) (220) and the main body stent (100), thereby making it easy to perform the procedure along a curved lumen. Covered stent. Claim 2 In claim 1, the first film (200) is formed to cover the inner surface of the main body stent (100), the third film (220) is formed to cover the inner surface of the expansion portion (150) and the inner surface of both ends (201) of the first film (200), the second film (210) is formed to cover the outer surface of the expansion portion (150) and the outer surface of both ends (160) of the main body stent (100), and is extended longer in the longitudinal direction of the main body stent (100) than the third film (220), and the first, second, and third films (200) (210) (220) are heat-bonded to form a gap space (300) between the part of the first film (200) that is not bonded to the second and third films (210) (220) and the main body stent (100). Covered stent that facilitates easy procedure. Claim 3 In claim 1, excluding the second and third films (210) (220) in the covered stent, the inner surfaces of both ends (160) of the main body stent (100) and the inner surfaces of both sides of the main body stent (100) adjacent thereto are each covered with a fourth film (230) made of PTFE (polytetrafluoroethylene) material and heat-bonded to the first film (200), thereby forming a gap space (300) between the part of the first film (200) not bonded to the fourth film (230) and the main body stent (100); and the expansion portion (150), one end portion (231) of the fourth film (230) adjacent to the bend portion (151) of the expansion portion (150), and both ends (201) of the first film (200) are made of silicone material by silicone dipping. A covered stent that is easy to operate along a curved lumen, characterized by being covered with a fifth film (400). Claim 4 In claim 3, the first film (200) is formed to cover the inner surface of the main body stent (100), and the fourth film (230) is configured to heat-bond to the first film (200) by covering the outer surface of both ends (160) of the main body stent (100) and both adjacent outer surfaces of the main body stent (100), thereby forming a gap space (300) between the part of the first film (200) that is not bonded to the fourth film (230) and the main body stent (100), and the fifth film (400) is characterized by covering the expanded portion (150), one end portion (231) of the fourth film (230), and both ends (201) of the first film (200) with silicone dipping. Claim 5 A covered stent that is easy to operate along a curved lumen, characterized in that, in claim 1, the intersection portion (130) is formed at 20% to 80% of the covered stent, and the cross-linking portion (120) is formed at 80% to 20% of the covered stent. Claim 6 In order to expand a lesion area (1a) that is narrowed or blocked in a lumen (1) inside the body and maintain a passage in the lumen (1), a cylindrical main body stent (100) in which wires (110) made of shape memory alloy are interwoven or crossed to form a plurality of interlocking portions (120) and crossing portions (130) so as to be hooked together, and a plurality of space portions (140) are formed between the wires (110), and an expansion portion (150) formed at both ends of the main body stent (100) so as to have a larger diameter than the main body stent (100), a sixth coating (240) made of PTFE (polytetrafluoroethylene) material is formed to cover the outer surface of the main body stent (100) and the outer surface of the expansion portion (150), and the inner surface of the expansion portion (150) and the expansion portion (150) A covered stent that facilitates surgical procedures along a curved lumen, characterized by being configured such that the inner surfaces of both ends (160) of a main body stent (100) adjacent to a bend (151) and the inner surfaces of the main body stent (100) adjacent thereto are each covered with a seventh film (250) made of PTFE (polytetrafluoroethylene) and adhered to a sixth film (240), thereby forming a gap space (300) between the part of the sixth film (240) that is not adhered to the seventh film (250) and the main body stent (100). Claim 7 In claim 6, the sixth film (240) is formed to cover the inner surface of the main body stent (100) and the inner surface of the expansion portion (150), and the seventh film (250) is formed to cover the outer surface of the expansion portion (150), the outer surface of both ends (160) of the main body stent (100), and the outer surface of the main body stent (100) adjacent thereto, respectively, and is adhered to the sixth film (240), thereby forming a gap space (300) between the part of the sixth film (240) that is not adhered to the seventh film (250) and the main body stent (100). This characterizes a covered stent that is easy to operate along a curved lumen. Claim 8 In claim 6, the seventh film (250) is excluded from the covered stent, the inner surface of the expansion portion (150) and the inner surface of both ends (160) of the main body stent (100) adjacent to the bend portion (151) of the expansion portion (150) are covered with an eighth film (410) made of silicone material and adhered to the sixth film (240), and both inner surfaces of the main body stent (100) adjacent to the inner surfaces of both ends (160) of the main body stent (100) are covered with a ninth film (260) made of PTFE (polytetrafluoroethylene) material and adhered to the sixth film (240), thereby forming a gap space (300) between the part of the sixth film (240) that is not adhered to the eighth and ninth films (410) (260) and the main body stent (100), along the curved lumen Easy-to-procedure covered stent. Claim 9 In claim 8, the curved shape is characterized in that the sixth film (240) is formed to cover the inner surface of the main body stent (100) and the expansion portion (150), the eighth film (410) covers the outer surface of the expansion portion (150) and the outer surface of both ends (160) of the main body stent (100) adjacent to the bend portion (151) of the expansion portion (150) and adheres to the sixth film (240), and the ninth film (260) covers both outer surfaces of the main body stent (100) adjacent to each end (160) of the main body stent (100) and adheres to the sixth film (240), thereby forming a gap space (300) between the part of the sixth film (240) that is not adhered to the eighth and ninth films (410) (260) and the main body stent (100). Covered stent that facilitates easy procedure along the lumen. Claim 10 A covered stent that is easy to operate along a curved lumen, characterized in that, in claim 6, the intersection portion (130) is formed at 20% to 80% of the covered stent, and the cross-section portion (120) is formed at 80% to 20% of the covered stent.