Double-nail type nailing control assembly and annulus repair system

Abstract

The invention discloses a double-nail type nailing control assembly and a valve ring repair system, and relates to the technical field of medical instruments, and the double-nail type nailing control assembly comprises a mounting shell, a nailing bending adjusting pipe, a nailing spring pipe and a positioning needle; the positioning needle is arranged in the nailing spring tube, the nailing spring tube is arranged in the nailing bending adjusting tube, the nailing bending adjusting tube is in circumferential limiting connection with the mounting shell, the positioning needle axially penetrates through the mounting shell, and the positioning needle is used for positioning a nailing position; two first through holes axially penetrating through the mounting shell are formed in the mounting shell, the nailing devices pass through the first through holes, and the nailing bourdon tube is in transmission connection with the nailing devices and used for controlling the two nailing devices to synchronously and axially move. According to the device, through one-time operation of rotating the nailing bourdon tube, the two nailing devices are simultaneously controlled to nail the valve ring tissue, and the nailing efficiency is improved; meanwhile, the multiple nailing control devices are close to one another in the circumferential direction in the mode that the locking wires are tensioned at the two ends at the same time through the wire locking assemblies, and the annulus tissue contraction is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a double - nail type nail - driving control assembly and an annulus repair system. Background Art

[0002] Currently, mitral insufficiency mainly has two treatment methods: drug treatment and surgical treatment. In surgical treatment, it is divided into edge - to - edge repair, annulus repair, and chordae tendineae repair. For annulus repair, doctors implant multiple anchor nails on the annulus one by one, and achieve annulus repair by tightening the anchor nails. However, the environment for implanting anchor nails is relatively harsh, and multiple implantations require doctors to spend a lot of energy, increasing the doctor's burden. Moreover, the operation time is relatively long, affecting the overall operation efficiency. Therefore, there is an urgent need to provide an efficient nail - driving structure. Summary of the Invention

[0003] In view of the above - mentioned defects or deficiencies in the prior art, the present invention provides a double - nail type nail - driving control assembly and an annulus repair system.

[0004] To achieve the above object, a double - nail type nail - driving control assembly of the present invention includes: An installation housing, a nail - driving bending tube, a nail - driving spring tube, and a positioning pin; The positioning pin is arranged in the nail - driving spring tube, the nail - driving spring tube is arranged in the nail - driving bending tube, the nail - driving bending tube is circumferentially and limit - connected with the installation housing, the positioning pin axially penetrates through the installation housing, and the positioning pin is used for positioning the nail - driving position; Two first through - holes axially penetrating are arranged on the installation housing, the first through - holes are used for the nail - driver to pass through, the nail - driving spring tube is in transmission connection with the nail - driver, and the nail - driving spring tube is used for controlling the synchronous axial movement of the two nail - drivers.

[0005] Preferably, a first driving structure and a first limiting structure are arranged on the installation housing. The first driving structure and the first limiting structure are respectively located at two ends of the axial direction of the installation housing, and the first driving structure and the first limiting structure are located between the two first through - holes; The first driving structure is circumferentially and limit - connected with the nail - driving spring tube, the first driving structure is respectively in transmission connection with the two nail - drivers, the nail - driving spring tube is used for controlling the first driving structure to rotate so that the two nail - drivers rotate synchronously, and the first limiting structure is used for converting the rotational movement of the nail - driver into axial movement.

[0006] Preferably, the nail - driver includes an anchor nail and a second driving structure. The anchor nail is fixedly connected with the second driving structure, and the second driving structure is meshed and connected with the first driving structure; A second through hole is provided in the first limiting structure. The second through hole is for the spiral part of the anchor pin to pass through. When the anchor pin rotates, the second through hole is used to guide the spiral part of the anchor pin to pass through, so that the anchor pin moves axially.

[0007] Preferably, one first driving structure is provided, and the displacement difference between the centers of the two second through holes in the axial direction is half of the pitch of the anchor pin.

[0008] Preferably, a second limiting structure is provided between the first driving structure and the nail driving spring tube. The second limiting structure includes a first limiting member provided on the first driving structure and a second limiting member provided at the end of the nail driving spring tube. When the first driving structure is connected to the nail driving spring tube, the first limiting member and the second limiting member are cooperatively connected to circumferentially limit the first driving structure and the nail driving spring tube.

[0009] Preferably, a third limiting structure is provided between the installation housing and the nail driving and bending tube. The third limiting structure includes a third limiting member and a fourth limiting member. The third limiting member and the fourth limiting member are provided at the end of the nail driving and bending tube and extend away from the nail driving and bending tube. The third limiting member and the fourth limiting member are arranged at intervals. When the installation housing is connected to the nail driving and bending tube, the installation housing is located in the interval space between the third limiting member and the fourth limiting member, and the third limiting member and the fourth limiting member respectively fit on both sides of the installation housing to circumferentially limit the installation housing and the nail driving and bending tube.

[0010] Preferably, a wire threading member is provided on the side wall of the installation housing, and the wire threading member protrudes from the installation surface. A third through hole is provided in the wire threading member. The third through hole is for the locking wire to pass through.

[0011] Preferably, a first end cover is further provided on the installation housing. The first end cover is installed on the side of the first driving structure away from the installation housing, and the first end cover is used to prevent pollutants from entering the rack on the circumferential side wall of the first driving structure.

[0012] Preferably, a fourth through hole is provided on the installation housing. The fourth through hole is located between the two first through holes. The fourth through hole axially penetrates the installation housing and the first driving structure, and the fourth through hole is for the positioning pin to pass through.

[0013] To achieve the above object, the present invention further provides a mitral annulus repair system, including a double - nail type nail driving control assembly and a wire locking assembly as described above. The double-nail nailing control assembly is used to control two nailers to nail into the valve ring tissue synchronously; The locking wire assembly is installed on the double-nail nailing control assemblies at the two ends of the multiple double-nail nailing control assemblies. The two locking wire assemblies are used to simultaneously tighten the locking wires so that the multiple double-nail nailing control assemblies are close to each other along the circumferential direction of the valve ring tissue, so as to contract the valve ring tissue.

[0014] Based on this, the beneficial effects of the present invention are: According to the solution of the present invention, two first through holes are arranged on the mounting shell, each of which is respectively used for a nail driver to pass through, and at the same time, the nailing spring tube is respectively connected to the two nail drivers in a transmission manner, so that when the nailing spring tube is controlled to rotate, the two nail drivers can be simultaneously controlled to move axially to realize the nailing operation, and two groups of nails can be controlled at one time. Compared with the solution of controlling one group of nails at a time in the prior art, the nailing efficiency can be effectively improved, and the surgical efficiency can be improved; BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram schematically shows the structure of a nailing control assembly according to an embodiment of the present invention; Figure 2 A schematic diagram schematically showing the structure of a mounting housing from a first viewing angle according to an embodiment of the present invention; Figure 3 A schematic diagram schematically showing the structure of a second viewing angle of an installation housing according to an embodiment of the present invention; Figure 4 A schematic diagram schematically showing the structure of a second limiting structure in one embodiment of the present invention; Figure 5 A schematic diagram schematically showing the structure of a third limiting structure according to an embodiment of the present invention; Figure 6 A schematic diagram schematically shows the structure of a valve ring repair system according to an embodiment of the present invention; Explanation of the accompanying drawings: 10-installing shell, 101-first through hole, 102-nail driver, 1021-anchor nail, 1022-second driving structure, 103-first driving structure, 104-first limiting structure, 1041-second through hole, 105-threading piece, 1051-third through hole, 106-first end cover, 107-fourth through hole, 20-nailing and bending tube, 30-nailing spring tube, 40-positioning needle, 50-second limiting structure, 501-first limiting piece, 502-second limiting piece, 60-third limiting structure, 601-third limiting piece, 602-fourth limiting piece, 70-wire locking assembly. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0017] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms "a", "the", and "said" used in the embodiments of this application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0018] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of this application to describe related structures, these related structures should not be limited to these terms. These terms are only used to distinguish the related structures from each other.

[0019] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while". Similarly, depending on the context, the phrase "if determined" can be interpreted as "when determined" or "when detecting (the stated condition or event)".

[0020] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of this application are described from the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that an element is formed "on" or "under" another element, it can not only be directly formed "on" or "under" another element, but also be indirectly formed "on" or "under" another element through an intermediate element.

[0021] Figure 1 Schematic structural diagram of a nail driving control assembly showing an embodiment of the present invention, Figure 2 Schematic structural diagram of a first perspective of an installation housing showing an embodiment of the present invention, Figure 3 Schematic structural diagram of a second perspective of an installation housing showing an embodiment of the present invention, as Figures 1-3 shown, a double-nail type nail driving control assembly of the present invention includes: An installation housing 10, a nail driving bending tube 20, a nail driving spring tube 30, and a positioning pin 40; The positioning pin 40 is arranged inside the nail driving spring tube 30, the nail driving spring tube 30 is arranged inside the nail driving bending tube 20, the nail driving bending tube 20 is circumferentially and limit-connected with the installation housing 10, the positioning pin 40 axially penetrates through the installation housing 10, and the positioning pin 40 is used for positioning the nail driving position; Two first through holes 101 axially penetrating are arranged on the installation housing 10, the first through holes 101 are used for the nail driver 102 to pass through, the nail driving spring tube 30 is in transmission connection with the nail driver 102, and the nail driving spring tube 30 is used for controlling the synchronous axial movement of the two nail drivers 102.

[0022] With such an arrangement, in the present invention, by arranging two first through holes 101 on the installation housing 10, the two nail drivers 102 can be installed on the installation housing 10. At the same time, through the transmission connection of the nail driving spring tube 30 with the two nail drivers 102, when the doctor manipulates the nail driving spring tube 30 to rotate, the synchronous axial movement of the two nail drivers 102 can be controlled to realize the nail driving operation. Compared with the conventional technology where only one group of nails is driven in one operation, the nail driving efficiency of the device of the present invention is higher, and the surgical efficiency can be further improved.

[0023] Furthermore, as Figure 2 、 3 shown, a first driving structure 103 and a first limiting structure 104 are arranged on the installation housing 10. The first driving structure 103 and the first limiting structure 104 are respectively located at both ends of the installation housing 10 in the axial direction, and the first driving structure 103 and the first limiting structure 104 are located between the two first through holes 101; The first driving structure 103 is circumferentially and limit-connected with the nail driving spring tube 30, the first driving structure 103 is respectively in transmission connection with the two nail drivers 102, the nail driving spring tube 30 is used for controlling the rotation of the first driving structure 103 to make the two nail drivers 102 rotate synchronously, and the first limiting structure 104 is used for converting the rotational movement of the nail driver 102 into axial movement.

[0024] The nail driver 102 includes an anchor nail 1021 and a second driving structure 1022. The anchor nail 1021 is fixedly connected with the second driving structure 1022, the second driving structure 1022 is in transmission connection with the first driving structure 103, and a second through hole 1041 is arranged on the first limiting structure 104. The second through hole 1041 is used for the spiral part of the anchor nail 1021 to pass through so that the anchor nail 1021 moves axially.

[0025] Specifically, the first driving structure 103 can be a first gear, and the second driving structure 1022 can be a second gear. A second groove (not shown in the figure) is provided on the installation housing 10. The second groove is located between two first through holes 101. The first driving structure 103 is movably installed in the second groove. The first driving structure 103 is meshed and connected with two second driving structures 1022 on both sides. When the nail driving spring tube 30 controls the first driving structure 103 to rotate, the two second driving structures 1022 on both sides rotate synchronously.

[0026] Meanwhile, the spiral part of the anchor nail 1021 passes through the second through hole 1041 of the first limiting structure 104. When the second driving structure 1022 drives the anchor nail 1021 to rotate circumferentially synchronously, the second through hole 1041 limits the circumferential rotation of the anchor nail 1021. Due to the structural setting of the spiral part, the spiral part of the anchor nail 1021 can pass through the second through hole 1041 in sequence, realizing the movement of the anchor nail 1021 rotating while moving axially, and further realizing the screwing of the anchor nail 1021 into the annulus tissue to complete the nailing operation.

[0027] Furthermore, in the solution of the present invention, the first driving structure 103 is set to one. At this time, when it is meshed and connected with the second driving structures 1022 on both sides, the rotation angles of the two second driving structures 1022 differ by 180° when they rotate. Corresponding to the anchor nail 1021, the spiral parts of the two anchor nails 1021 differ by half a pitch. Therefore, when the second through holes 1041 are provided on the first limiting structure 104, the centers of the two second through holes 1041 need to differ by a distance of half a pitch in the axial direction, so as to ensure that both spiral parts can smoothly pass through the second through holes 1041.

[0028] Further, Figure 4 The structural schematic diagram of the second limiting structure showing an embodiment of the present invention is Figure 5 The structural schematic diagram of the third limiting structure showing an embodiment of the present invention is as Figure 4 、 5 shown: A second limiting structure 50 is provided between the first driving structure 103 and the nail driving spring tube 30. The second limiting structure 50 includes a first limiting member 501 provided on the first driving structure 103 and a second limiting member 502 provided at the end of the nail driving spring tube 30; When the first driving structure 103 is connected to the nail driving spring tube 30, the first limiting member 501 is cooperatively connected with the second limiting member 502 to circumferentially limit the first driving structure 103 and the nail driving spring tube 30.

[0029] Specifically, the first limiting member 501 can be set as a first groove, and the second limiting member 502 can be set as a first protrusion. When the first driving structure 103 is connected to the nail driving spring tube 30, the first protrusion is inserted into the first groove.

[0030] Through the setting of the second limiting structure 50, it is possible to achieve the circumferential rotation of the first driving structure 103 by the nail driving spring tube 30. At the same time, since the two are only circumferentially limited, when driving a nail, the second limiting member 502 is located in the first limiting member 501 to realize the rotation control of the first driving structure 103. After driving the nail, the nail driving spring tube 30 can be directly withdrawn, and the second limiting member 502 and the first limiting member 501 can be disassembled to realize the separation operation of the two, and the disassembly and assembly of the two are simple.

[0031] It can be understood that the second limiting structure 50 can also be other structures that can realize the mutual circumferential limitation of the two.

[0032] Further, a third limiting structure 60 is provided between the installation housing 10 and the nail driving and bending tube 20. The third limiting structure 60 includes a third limiting member 601 and a fourth limiting member 602. The third limiting member 601 and the fourth limiting member 602 are provided at the end of the nail driving and bending tube 20 and extend in a direction away from the nail driving and bending tube 20; The third limiting member 601 and the fourth limiting member 602 are arranged at intervals. When the installation housing is connected to the nail driving and bending tube 20, the installation housing 10 is located in the interval space between the third limiting member 601 and the fourth limiting member 602, and the third limiting member 601 and the fourth limiting member 602 respectively fit on both sides of the installation housing 10 to circumferentially limit the installation housing 10 and the nail driving and bending tube 20.

[0033] Specifically, the side wall of the installation housing 10 is a plane or can also be set as a wavy shape. When the side wall of the installation housing 10 can be set as a wavy shape, there are two or more recesses, and the third limiting member 601 and the fourth limiting member 602 can be limiting cylinders, which respectively lap on the four recesses on both sides of the installation housing 10 to realize the circumferential limiting function, and at the same time, it can further save the manufacturing material of the third limiting structure and realize the light weight of the device.

[0034] The setting of the third limiting structure 60 can ensure that when the nail driving spring tube 30 drives the first driving structure 103 to rotate, by fixing the nail driving and bending tube 20, it is avoided that the installation housing 10 rotates synchronously with the first driving structure 103 due to friction, thereby ensuring that the nail driver 102 can smoothly perform axial movement.

[0035] Further, a wire threading member 105 is provided on the side wall of the installation housing 10, and the wire threading member 105 protrudes from the set surface; A third through hole 1051 is provided on the wire threading member 105 for the locking wire to pass through.

[0036] With such a setting, after the anchor pin 1021 is screwed into the annulus tissue, the installation housing 10 is fixed to the annulus tissue. By implanting a plurality of nail driving control devices in the annulus tissue and passing the locking wires through the wire threading members 105 in sequence, and tightening the locking wires by pulling at both ends or fixing one side and pulling the other side, the plurality of installation housings 10 are made to approach each other to contract the annulus tissue, thereby realizing the repair operation of the annulus tissue.

[0037] Furthermore, a first end cover 106 is also provided on the installation housing 10. The first end cover 106 is installed on the side of the first driving structure 103 away from the installation housing 10. The first end cover 106 is used to prevent contaminants from entering the rack on the circumferential side wall of the first driving structure 103, so as to avoid affecting the rotation of the first driving structure 103.

[0038] Furthermore, a fourth through hole 107 is provided on the installation housing 10. The fourth through hole 107 is located between the two first through holes 101. The fourth through hole 107 axially penetrates the installation housing 10 and the first driving structure 103. The fourth through hole 107 is for the positioning needle 40 to pass through.

[0039] Furthermore, the installation housing 10 can be set as a hollow structure, so that the first through hole 101 not only penetrates the installation housing 10 in the axial direction, but also penetrates part of the side wall of the installation housing 10, realizing the light weight of the device by reducing the overall material.

[0040] With such a setting, before the anchor pin 1021 is nailed into the annulus tissue, the positioning needle 40 passes through the installation housing 10, and the doctor controls the positioning needle 40 to be nailed into the annulus tissue at the surgical position to realize the pre - fixation of the installation housing 10, preventing the problem of inaccurate positioning caused by the shaking of the device when the anchor pin 1021 is screwed in.

[0041] Furthermore, Figure 6 Schematically showing the structural schematic diagram of an annulus repair system according to an embodiment of the present invention, as Figure 6 shown, the present invention also provides an annulus repair system, including a double - nail type nail driving control assembly as described above, and further including a wire locking assembly 70; Specifically, during the annulus repair surgery, a plurality of double - nail type nail driving control assemblies are implanted in the annulus tissue in sequence, and by synchronously controlling the two nail drivers 102 to be nailed into the annulus tissue, efficient nailing is realized; The locking wire assembly 70 is installed on the double-nail nailing control assembly at the two ends of the multiple double-nail nailing control assemblies. Specifically, it is fixedly connected to the mounting shell 10 and connected to the locking wire. The locking wire passes through the threading pieces 105 on the multiple mounting shells 10 in sequence. When the nailing is completed, the locking wire is tightened simultaneously by controlling the two locking wire assemblies 70 located at both ends, so that the multiple double-nail nailing control devices are close to each other along the circumferential direction of the valve ring tissue, thereby contracting the valve ring tissue and realizing the valve ring repair surgery.

[0042] To sum up, by setting two first through holes 101 on the mounting shell 10, two nailers 102 can be installed therein respectively, and at the same time, the two nailers 102 are transmission connected with the nailing spring tube 30, so that when the nailing spring tube 30 is controlled to rotate, the two nailers 102 can be controlled to move axially at the same time to achieve nailing into the valve ring tissue, and two nailing can be completed in one operation, which greatly reduces the operation time of completing one nailing in one operation in traditional technology, reduces the burden on doctors, and improves surgical efficiency.

[0043] The above description is only a preferred embodiment of the present application. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A double-nail type nailing control component, characterized in that, Comprising: An installation housing, a nail driving and bending pipe, a nail driving spring pipe, and a positioning pin; The positioning pin is arranged inside the nail driving spring pipe, the nail driving spring pipe is arranged inside the nail driving and bending pipe, the nail driving and bending pipe is circumferentially and limit-connected to the installation housing, the positioning pin axially penetrates through the installation housing, and the positioning pin is used for positioning the nail driving position; Two first through holes axially penetrating are arranged on the installation housing, the first through holes are used for the nail driver to pass through, the nail driving spring pipe is in driving connection with the nail driver, and the nail driving spring pipe is used for controlling the synchronous axial movement of the two nail drivers.

2. The double-nail type nailing control component according to claim 1, characterized in that, A first driving structure and a first limiting structure are arranged on the installation housing, the first driving structure and the first limiting structure are respectively located at two ends of the installation housing in the axial direction, and the first driving structure and the first limiting structure are located between the two first through holes; The first driving structure is circumferentially and limit-connected to the nail driving spring pipe, the first driving structure is respectively in driving connection with the two nail drivers, the nail driving spring pipe is used for controlling the rotation of the first driving structure so that the two nail drivers rotate synchronously, and the first limiting structure is used for converting the rotational movement of the nail driver into an axial movement.

3. The double-nail type nail driving control assembly according to claim 2, wherein The nail driver comprises an anchor nail and a second driving structure, the anchor nail is fixedly connected to the second driving structure, and the second driving structure is in driving connection with the first driving structure; A second through hole is arranged on the first limiting structure, the second through hole is used for the spiral part of the anchor nail to pass through, and when the anchor nail rotates, the second through hole is used for guiding the spiral part of the anchor nail to pass through so that the anchor nail moves axially.

4. A double-nail type nail driving control assembly according to claim 3, characterized in that, The first driving structure is arranged as one, and the displacement difference between the centers of the two second through holes in the axial direction is half of the pitch of the anchor nail.

5. The double-nail type nailing control assembly according to claim 2, wherein A second limiting structure is arranged between the first driving structure and the nail driving spring pipe, the second limiting structure comprises a first limiting member arranged on the first driving structure and a second limiting member arranged at the end of the nail driving spring pipe; When the first driving structure is connected to the nail driving spring pipe, the first limiting member and the second limiting member are cooperatively connected to circumferentially limit the first driving structure and the nail driving spring pipe.

6. The double-nail type nailing control assembly according to claim 1, characterized in that, A third limiting structure is arranged between the installation housing and the nail driving and bending pipe, the third limiting structure comprises a third limiting member and a fourth limiting member, the third limiting member and the fourth limiting member are arranged at the end of the nail driving and bending pipe and extend in a direction away from the nail driving and bending pipe; The third limiting member and the fourth limiting member are arranged at intervals, when the installation housing is connected to the nail driving and bending pipe, the installation housing is located in the interval space between the third limiting member and the fourth limiting member, and the third limiting member and the fourth limiting member respectively fit on both sides of the installation housing to circumferentially limit the installation housing and the nail driving and bending pipe.

7. A double-nail type nail driving control assembly according to claim 2, characterized in that, A wire threading member is arranged on the side wall of the installation housing, and the wire threading member protrudes from the set surface; A third through hole is arranged on the wire threading member, and the third through hole is used for a locking wire to pass through.

8. A double-nail type nailing control assembly according to claim 2, characterized in that, A first end cap is further provided on the installation housing. The first end cap is installed on a side of the first driving structure away from the installation housing, and the first end cap is used to prevent contaminants from entering the rack on the circumferential side wall of the first driving structure.

9. The double-nail type nail driving control assembly according to claim 2, wherein, A fourth through hole is provided in the installation housing. The fourth through hole is located between the two first through holes. The fourth through hole axially penetrates the installation housing and the first driving structure, and the fourth through hole is for a positioning pin to pass through.

10. An annulus repair system, characterized in that, Comprising a double-nail type stapling control assembly and a wire-locking assembly according to any one of claims 1-9; The double-nail type stapling control assembly is used to control two staplers to simultaneously staple into the annulus tissue; The wire-locking assembly is installed on the double-nail type stapling control assemblies at the two outermost ends among the plurality of double-nail type stapling control assemblies. The two wire-locking assemblies are used to simultaneously tighten the locking wire so that the plurality of double-nail type stapling control assemblies approach each other in the circumferential direction of the annulus tissue, so as to contract the annulus tissue.

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