Stent

Abstract

A stent having an improved anti-sliding function is proposed. The stent includes an inner stent and a pair of outer stents that have undergone heat treatment and have several spaces formed by weaving or crossing wires made of a superelastic shape memory alloy in a hollow cylindrical net shape, in which each of the outer stents is shorter than the inner stent and has an enlarged section having a diameter larger than the inner stent and a bending section formed by bending inward a side of the enlarged section; and the pair of outer stents are fitted on both ends of the inner stent such that the enlarged sections of the outer stents face each other, and spaces of the inner stent and spaces of the bending sections of the outer stents are connected by a connection thread, whereby a space section is defined between the inner stent and the outer stents.

Claims

1. A stent having an improved anti-sliding function, the stent comprising an inner stent and a pair of outer stents that have undergone heat treatment and have several spaces formed by weaving or crossing wires made of a superelastic shape memory alloy in a hollow cylindrical net shape, wherein each of the outer stents is shorter than the inner stent and has an enlarged section having a diameter larger than the inner stent and a bending section formed by bending inward a side of the enlarged section, and the pair of outer stents are fitted on both ends of the inner stent such that the enlarged sections of the pair of outer stents face each other, and spaces of the inner stent and spaces of the bending sections of the pair of outer stents are connected by a connection thread, whereby a space section is defined between the inner stent and the outer stents.

2. The stent of claim 1, wherein a pulling string is threaded to the spaces at an end of the inner stent exposed through the bending section of each of the outer stents.

3. The stent of claim 1, wherein a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed on the inner stent to cover the spaces of the inner stent.

4. The stent of claim 1, wherein a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed at a predetermined portion or positions with predetermined gaps on the inner stent to cover only some of the spaces of the inner stent.

5. A stent having an improved anti-sliding function, the stent comprising an inner stent and a pair of outer stents that have undergone heat treatment and have several spaces formed by weaving or crossing wires made of a superelastic shape memory alloy in a hollow cylindrical net shape, wherein each of the outer stents is shorter than the inner stent and has an enlarged section having a diameter larger than the inner stent and a bending section formed by bending inward a side of the enlarged section, a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed on each of the outer stents to cover the spaces of the outer stents, and the pair of outer stents are fitted on both ends of the inner stent such that the enlarged sections of the pair of outer stents face each other, and spaces of the inner stent and spaces of the bending sections of the pair of outer stents are connected by a connection thread, whereby a space section is defined between the inner stent and the outer stents.

6. The stent of claim 5, wherein a pulling string is threaded to the spaces at an end of the inner stent exposed through the bending section of each of the outer stents.

7. The stent of claim 5, wherein a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed at a predetermined portion or positions with predetermined gaps on each of the outer stents to cover only some of the spaces of the outer stents.

8. A stent having an improved anti-sliding function, the stent comprising an inner stent and a pair of outer stents that have undergone heat treatment and have several spaces formed by weaving or crossing wires made of a superelastic shape memory alloy in a hollow cylindrical net shape, wherein each of the outer stents is shorter than the inner stent and has an enlarged section having a diameter larger than the inner stent and a bending section formed by bending inward a side of the enlarged section, a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed on the inner stent to cover the spaces of the inner stent and a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed on each of the outer stents to cover the spaces of the outer stents, and the pair of outer stents are fitted on both ends of the inner stent such that the enlarged sections of the pair of outer stents face each other, and spaces of the inner stent and spaces of the bending sections of the pair of outer stents are connected by a connection thread, whereby a space section is defined between the inner stent and the outer stents.

9. The stent of claim 8, wherein a pulling string is threaded to the spaces at an end of the inner stent exposed through the bending section of each of the outer stents.

10. The stent of claim 8, wherein a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed at a predetermined portion or positions with predetermined gaps on the inner stent to cover only some of the spaces of the inner stent and a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed at a predetermined portion or positions with predetermined gaps on each of the outer stents to cover only some of the spaces of the outer stents.

11. The stent of claim 8, wherein a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed at a predetermined portion or positions with predetermined gaps on each of the outer stents to cover only some of the spaces of the outer stents.

12. The stent of claim 8, wherein a membrane made of silicon or Polytetrafluoroethylene (PTFE) is disposed at a predetermined portion or positions with predetermined gaps on the inner stent to cover only some of the spaces of the inner stent.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:

(2) FIGS. 1 to 3B are views showing the details and the using state of a stent having an improved anti-sliding function according to a first embodiment of the present invention;

(3) FIGS. 4A to 5C are views showing the details and the using state of a stent having an improved anti-sliding function according to a second embodiment of the present invention;

(4) FIGS. 6A to 7C are views showing the details and the using state of a stent having an improved anti-sliding function according to a third embodiment of the present invention;

(5) FIGS. 8A to 9C are views showing the details and the using state of a stent having an improved anti-sliding function according to a fourth embodiment of the present invention;

(6) FIGS. 10A to 11C are views showing the details and the using state of a stent having an improved anti-sliding function according to a fifth embodiment of the present invention;

(7) FIGS. 12A to 13B are views showing the details and the using state of a stent having an improved anti-sliding function according to sixth embodiment of the present invention;

(8) FIGS. 14A to 15C are views showing the details and the using state of a stent having an improved anti-sliding function according to a seventh embodiment of the present invention;

(9) FIGS. 16A to 17C are views showing the details and the using state of a stent having an improved anti-sliding function according to an eighth embodiment of the present invention;

(10) FIGS. 18A to 19C are views showing the details and the using state of a stent having an improved anti-sliding function according to a ninth embodiment of the present invention; and

(11) FIGS. 20A to 23B are views showing the using state of a stent having an improved anti-sliding function according to various embodiments of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(12) Hereafter, various embodiments of the present invention are described in detail with reference to the accompanying drawings.

(13) As shown in FIGS. 1 to 23B, a stent 100 having an improved anti-sliding function according to various embodiments of the present invention is used to expand a narrowed or occluded lesion in a lumen 2 in a human body by being inserted into the lumen 2 of the human body such as the respiratory tract and the esophagus.

(14) As shown in FIGS. 1 to 3B, a stent 100 according to a first embodiment of the present invention includes inner and outer stents 10 and 20 that have undergone heat treatment and have several spaces 11 and 22 formed by weaving or crossing wires 1 made of a superelastic shape memory alloy in a hollow cylindrical net shape.

(15) The outer stent 20 is shorter in longitudinal direction than the inner stent 10.

(16) The outer stent has a cylindrical enlarged section 22 having a larger diameter than the inner stent 10 and a conical bending section 23 formed by bending inward a side of the enlarged section 22.

(17) In the stent 100, a pair of outer stents 20 are fitted on both ends of the inner stent 10 such that a pair of enlarged sections 22 face each other.

(18) The pair of enlarged sections 22 of the pair of outer stents 20 face each other with an end of each of a bending sections 23 in close contact with the inner stent 10.

(19) The pair of outer stents 20 are positioned at both ends of the inner stent 10 farthest from the center of the inner stent 10.

(20) An end of the inner stent 10 is exposed through the bending section 23 of one outer stent 20.

(21) In the stent 10, spaces 11 being in close contact with each other of the inner stent 10 and spaces 21 of the pair of bending sections 23 are connected by connection threads that are not harmful to a human body.

(22) A space 40 is defined between the inner stent 10 and the outer stents 20.

(23) In the stent 100, a pulling string 50 that is not harmful to a human body is threaded to the spaces 11 at an end of the inner stent exposed through the outer stent 20, and protrudes out of the inner stent 10.

(24) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen 2 in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(25) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(26) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(27) The lumen 2 and the lesion 3 in the human body are partially inserted in the spaces 11 and 21 of the inner stent 10 and the pair of outer stents 20.

(28) That is, the spaces 11 and 21 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(29) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(30) Further, as shown in FIGS. 4A to 5C, a stent 100 according to a second embodiment that has the almost the same configuration as the first embodiment of the present invention has a membrane 12 made of silicon or Polytetrafluoroethylene (PTFE) on the inner stent 10, so the spaces 11 are covered.

(31) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen 2 in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(32) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(33) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(34) The lumen 2 and the lesion in the human body partially inserted in the spaces 21 of the pair of outer stents 20.

(35) That is, the spaces 21 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(36) The spaces 11 of the inner stent 10 are covered by the membrane 12, so the lumen 2 and the lesion 3 in the human body are not inserted therein.

(37) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(38) Further, as shown in FIGS. 6A to 7C, a stent 100 according to a third embodiment that has the almost the same configuration as the first embodiment of the present invention has a membrane 12 made of silicon or Polytetrafluoroethylene (PTFE) at a predetermined portion or at positions with predetermined gaps on the inner stent 10, so only some of the spaces 11 are covered.

(39) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen 2 in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(40) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(41) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(42) The lumen 2 and the lesion in the human body partially inserted in the spaces 21 of the pair of outer stents 20.

(43) That is, the spaces 21 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(44) Some of the spaces 11 of the inner stent 10 are not covered by the membrane 12, so the lumen 2 and the lesion 3 in the human body are inserted therein.

(45) That is, the spaces 11 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(46) The others of the spaces 11 of the inner stent 10 are covered by the membrane 12, so the lumen 2 and the lesion 3 in the human body are not inserted therein.

(47) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(48) Further, as shown in FIGS. 8A to 9C, a stent 100 according to a fourth embodiment that has the almost the same configuration as the first embodiment of the present invention has a membrane 24 made of silicon or Polytetrafluoroethylene (PTFE) on the outer stent 20, so the spaces 21 are covered.

(49) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(50) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(51) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(52) The lumen 2 and the lesion in the human body partially inserted in the spaces 11 of the inner stent 10.

(53) That is, the spaces 11 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(54) The spaces 21 of the outer stent 20 are covered by the membrane 24, so the lumen 2 and the lesion 3 in the human body are not inserted therein.

(55) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(56) Further, as shown in FIGS. 10A to 11C, a stent 100 according to a fifth embodiment that has the almost the same configuration as the first embodiment of the present invention has a membrane 24 made of silicon or Polytetrafluoroethylene (PTFE) at a predetermined portion or at positions with predetermined gaps on the outer stent 20, so only some of the spaces 21 are covered.

(57) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen 2 in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(58) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(59) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(60) The lumen 2 and the lesion in the human body partially inserted in the spaces 11 of the inner stent 10.

(61) That is, the spaces 11 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(62) Some of the spaces 21 of the outer stent 20 are not covered by the membrane 24, so the lumen 2 and the lesion 3 in the human body are inserted therein.

(63) That is, the spaces 21 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(64) The others of the spaces 21 of the outer stent 20 are covered by the membrane 24, so the lumen 2 and the lesion 3 in the human body are not inserted therein.

(65) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(66) Further, as shown in FIGS. 12A to 13B, a stent 100 according to a sixth embodiment that has the almost the same configuration as the first embodiment of the present invention has membranes 12 and 24 made of silicon or Polytetrafluoroethylene (PTFE) on the inner and outer stents 10 and 20, so the spaces 11 and 21 are covered.

(67) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(68) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(69) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(70) The spaces 11 and 21 of the inner and outer stents 10 and 20 are covered by the membranes 12 and 24, so the lumen 2 and the lesion 3 in the human body are not inserted therein.

(71) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(72) Further, as shown in FIGS. 14A to 15C, a stent 100 according to a seventh embodiment that has the almost the same configuration as the first embodiment of the present invention has membranes 12 and 24 made of silicon or Polytetrafluoroethylene (PTFE) at a predetermined portion or at positions with predetermined gaps on inner and outer stent 10 and 20, so only some of the spaces 11 and 21 are covered.

(73) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen 2 in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(74) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(75) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(76) Some of the spaces 11 and 21 of the inner and outer stent 10 and 20 are not covered by the membranes 12 and 24, so the lumen 2 and the lesion 3 in the human body are inserted therein.

(77) That is, the spaces 11 and 21 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(78) The others of the spaces 11 and 21 of the inner and outer stents 10 and 20 are covered by the membranes 12 and 24, so the lumen 2 and the lesion 3 in the human body are not inserted therein.

(79) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(80) Further, as shown in FIGS. 16A to 17C, a stent 100 according to an eighth embodiment that has the almost the same configuration as the first embodiment of the present invention has a membrane 12 made of silicon or Polytetrafluoroethylene (PTFE) on the inner stent 10, so the spaces 11 and 21 are covered.

(81) Further, in the stent 100, a membrane 24 made of silicon or Polytetrafluoroethylene (PTFE) is formed only at a predetermined portion or positions with predetermined gaps on the outer stent 20, so only some of the spaces 21 are covered.

(82) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(83) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(84) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(85) Some of the spaces 21 of the outer stent 20 are not covered by the membrane 24, so the lumen 2 and the lesion 3 in the human body are inserted therein.

(86) That is, the spaces 21 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(87) The others of the spaces 11 of the inner stent 10 and the spaces 21 of the outer stent 20 are covered by the membranes 12 and 24, so the lumen 2 and the lesion 3 in the human body are not inserted therein.

(88) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(89) Further, as shown in FIGS. 18A to 19C, a stent 100 according to a ninth embodiment that has the almost the same configuration as the first embodiment of the present invention has a membrane 12 made of silicon or Polytetrafluoroethylene (PTFE) at a predetermined portion or at positions with predetermined gaps on the inner stent 10, so only some of the spaces 11 are covered.

(90) Further, in the stent 100, a membrane 24 made of silicon or Polytetrafluoroethylene (PTFE) is formed on the outer stent 20, so the spaces 21 are covered.

(91) Accordingly, the stent 100 is inserted into a narrowed or occluded lesion 3 in a lumen in a human body such as the respiratory tract and the esophagus for an operation by a stent operation device such as a catheter.

(92) Accordingly, the inner stent 10 and the pair of outer stents 20 expand the narrowed or occluded lesion 3.

(93) Further, the pair of outer stents 20 are further inserted into the lumen 2 and the lesion 3 in the human body than the inner stent 10 and then stuck thereto.

(94) Some of the spaces 11 of the inner stent 10 are not covered by the membrane 12, so the lumen 2 and the lesion 3 in the human body are inserted therein.

(95) That is, the spaces 11 are stuck to portions of the lumen 2 and the lesion 3 in the human body.

(96) The others of the spaces 21 of the outer stent 20 and the spaces 11 of the inner stent 10 are covered by the membranes 12 and 24, so the lumen 2 and the lesion 3 in the human body are not inserted therein.

(97) Accordingly, the stent 10 is fixed in the lumen 2 and the lesion 3 in the human body.

(98) Further, as shown in FIGS. 20A and 20B, the pair of outer stents 20 of the stent 100 according to various embodiments of the present invention are stuck to the lumen 2 and the lesion 3 in the human body when the outer stents 20 receive shaking of the human body and external force applied to the human in perpendicular direction of the human body.

(99) That is, when the pair of outer stents 20 of the stent 100 strongly receive shaking of the human body and external force applied to the human in any one or both of perpendicular directions of the human body, the outer stents 20 can slide in the lesion 3, but the pair of enlarged sections 22 face each other, so one or both of the enlarged sections 22 are stuck to the lumen 2 and the lesion 3.

(100) In other words, the stent 100 does not slide in the lesion 3.

(101) Further, as shown in FIG. 21, the pair of outer stents 2 of the stent 100 according to various embodiments of the present invention are pressed in the same direction to the lumen 2 and the lesion 3 in the human body when the outer stents 20 receive shaking of the human body and external force applied to the human in any one of horizontal directions of the human body.

(102) Then, the space 40 defined between the inner stent 10 and the pair of outer stents 20 is deformed and the pair of outer stents 20 are inclined together in any one direction with respect to the inner stent 10.

(103) The inclined outer stents 20 are stuck while being inserted deeper in the lumen 2 and lesion 3 in the human body.

(104) That is, the stent 100 does not slide in the lesion 3.

(105) Further, as shown in FIG. 22, the pair of outer stents 20 of the stent 100 according to various embodiments of the present invention are pressed in different directions to the lumen 2 and the lesion 3 in the human body when the outer stents 20 receive shaking of the human body and external force applied to the human in different horizontal directions of the human body.

(106) Then, the space 40 defined between the inner stent 10 and the pair of outer stents 20 is deformed and the pair of outer stents 20 are inclined different directions with respect to the inner stent 10.

(107) The inclined outer stents 20 are stuck while being inserted deeper in the lumen 2 and lesion 3 in the human body.

(108) That is, the stent 100 does not slide in the lesion 3.

(109) Further, as shown in FIG. 23, the pair of outer stents 21 of the stent 100 according to various embodiments of the present invention are pressed in the same direction to the lumen 2 and the lesion 3 in the human body when the outer stents 21 receive together shaking of the human body and external force applied to the human in any one of horizontal directions of the human body.

(110) Then, the space 40 defined between the inner stent 10 and the pair of outer stents 20 is deformed and both non-pressed sides of the pair of outer stents 20 protrude toward the lumen 2 and the lesion 3 in the human body with respect to the inner stent 10.

(111) The both protruding sides of the pair of outer stents 20 are stuck while being inserted deeper in the lumen 2 and lesion 3 in the human body.

(112) That is, the stent 100 does not slide in the lesion 3.

(113) Accordingly, when the narrowed or occluded lesion 3 in the lumen 2 of the human body is cured, a user pulls the pulling string suing a stent operation device such as a catheter.

(114) Then, the entire stent 100 of the present invention stretches and the volume decreases, so the stent 10 is easily taken out of the lumen 2 and the human body by a stent operation device such as a catheter.

(115) Although the present invention was described above with reference to specific embodiments, the present invention is not limited to the embodiments and may be changed and modified in various ways by those skilled in the art without departing from the scope of the present invention.