Expandable suture anchor and expandable suture anchor system

Abstract

The application provides an expansion type suture anchor and an expansion type suture anchor system, the expansion type suture anchor is used for anchoring on a bone, and comprises a first screw, a second screw and an expansion member; the first screw and the second screw are threadedly connected in the direction of an axis, the first screw is used for rotating around the axis under the driving of an operating tool; when the first screw is driven to rotate relative to the second screw, the relative movement of the first screw and the second screw in the direction of the axis is converted into the relative movement in the direction perpendicular to the axis through thread conversion, and the relative movement of the first screw and the second screw in the direction of the axis causes the expansion member to expand outward in the direction perpendicular to the axis, so as to be anchored on the bone; wherein the expansion type suture anchor has an initial circumferential envelope contour, and the expansion member does not exceed the initial circumferential envelope contour when being in an initial state without outward expansion. In this way, the expansion member can be caused to expand and embedded in the bone by driving the first screw to rotate, and the problems of easy loosening and easy pulling out existing in the threaded fixing mode are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an inflatable suture anchor and an inflatable suture anchor system. BACKGROUND

[0002] Tendon and ligament injuries around joints are common in orthopedics. In clinical practice, suture anchors are often used to fix the residual ends of damaged tendons to bone tissue to restore the normal structure of tendons and joint function, and to achieve the purpose of final fixation through tendon-bone healing. The process of tendon-bone healing requires a certain contact area and firm contact stability between the tendon and the rough surface of the bone end. Therefore, the fixation strength of the suture anchor in the bone is the key and basis for the success of the operation.

[0003] Most of the existing suture anchors on the market have a threaded structure on the anchor body of the suture anchor. A channel with a diameter slightly smaller than the anchor body is pre-drilled, and then the anchor body is screwed into or directly driven into the bone to achieve fixation. However, the compression stability generated by the threaded connection between the anchor body and the bone tissue is limited. In clinical practice, the anchor body often becomes loose and is pulled out after being fixed, resulting in fixation failure and surgical failure. This phenomenon often occurs, especially in cases of bone loss or osteoporosis, and in joint parts such as shoulders and elbows with large joint movement ranges and strong tendon strength. SUMMARY

[0004] The purpose of the present application is to provide an inflatable suture anchor and an inflatable suture anchor system to solve the problem of easy loosening and pulling out of the existing suture anchor.

[0005] To solve the above technical problems, the present application provides an inflatable suture anchor for anchoring on a bone, comprising: a first threaded member, a second threaded member, and an expansion member.

[0006] The first threaded member and the second threaded member are threadedly connected along the direction of an axis, and the first threaded member is used to rotate around the axis under the drive of an operating tool.

[0007] When the first threaded member is driven to rotate relative to the second threaded member, the rotation is converted into relative movement along the direction of the axis by threads, and the relative movement of the first threaded member and the second threaded member along the direction of the axis causes the expansion member to expand outwardly in a direction perpendicular to the axis to anchor on the bone.

[0008] The inflatable suture anchor has an initial circumferential envelope profile, and when the expansion member is not expanded outwardly and is in an initial state, it does not exceed the initial circumferential envelope profile.

[0009] Optionally, the inflatable suture anchor comprises at least two of the inflatable members, which are distributed circumferentially around the axis.

[0010] The inflatable member is in an initial state when it is not inflated outwardly, and in the initial state, the inflatable member does not exceed the initial circumferential envelope profile.

[0011] Optionally, the second threaded member has a pointed end away from the first threaded member; and / or, the outer periphery of the second threaded member has a limited rotation structure.

[0012] Optionally, when the first threaded member is driven to rotate reversely relative to the second threaded member, the relative reverse movement of the first threaded member and the second threaded member along the direction of the axis causes the inflatable member to contract inwardly along a direction perpendicular to the axis.

[0013] Optionally, the first threaded member has a connecting portion adapted to the operating tool, which extends along the direction of the axis and has a threading hole penetrating along a direction at an angle to the axis.

[0014] Optionally, the connecting portion has a receiving cavity extending along the direction of the axis, which communicates with the threading hole, and the receiving cavity has a cross-sectional dimension perpendicular to the axis not less than that of the suture to allow the suture to be accommodated therein.

[0015] Optionally, one of the first threaded member and the second threaded member has an axial limiting platform, and the other of the first threaded member and the second threaded member has a pressing portion; the inflatable member has opposite first and second ends along the axis, the first end is in abutting connection with the axial limiting platform, and the second end is a free end; when the first threaded member and the second threaded member move relatively along the direction of the axis, the pressing portion causes the inflatable member to inflate outwardly by pressing the second end and / or the inner wall of the inflatable member.

[0016] Optionally, at least one of the pressing portion and the second end has an inclined surface, which inclines inwardly toward the pressing direction.

[0017] Optionally, the inflatable suture anchor further comprises a limiting expansion member for limiting the first end from expanding away from the axis.

[0018] Optionally, the inflatable suture anchor comprises first and second hinge portions arranged along a direction perpendicular to the axis, the first hinge portion is rotatably arranged on the first threaded member around the axis, the second hinge portion is arranged on the second threaded member, and the two ends of the inflatable member along the axis are rotatably connected with the first and second hinge portions, respectively.

[0019] Optionally, the first hinge part and / or the second hinge part comprises a hinge shaft curved around the axis, the expansion member has a hinge hole matched with the hinge shaft, and the expansion member is rotatably sleeved on the hinge shaft through the hinge hole.

[0020] Optionally, the first hinge part and / or the second hinge part has a circumferential limiting part, the expansion member comprises a hinge joint, and the hinge hole is arranged on the hinge joint; the circumferential limiting part is used for limiting the circumferential position of the hinge joint relative to the first hinge part and / or the second hinge part around the axis.

[0021] Optionally, the first screw part has a circumferential groove, the first hinge part is rotatably clamped in the groove around the axis and is limited in position by the groove along the direction of the axis.

[0022] Optionally, the outer surface of the expansion member away from the axis has an anti-skid structure.

[0023] In summary, in the expansion type suture anchor and the expansion type suture anchor system provided by the application, the expansion type suture anchor is used for anchoring on a bone, which comprises a first screw part, a second screw part and an expansion member; the first screw part and the second screw part are threadedly connected along the direction of an axis, the first screw part is used for rotating around the axis under the driving of an operating tool; when the first screw part is driven to rotate relative to the second screw part, the rotation is converted into relative movement along the direction of the axis through the thread, and the relative movement of the first screw part and the second screw part along the direction of the axis causes the expansion member to expand outwardly along a direction perpendicular to the axis to anchor on the bone; wherein the expansion type suture anchor has an initial circumferential envelope contour, and the expansion member does not exceed the initial circumferential envelope contour when it is in an initial state without outward expansion.

[0024] With such a configuration, by driving the first threaded member to rotate, the expansion member can be caused to expand to embed into the bone, avoiding the problems of easy loosening and easy pulling out existing in the threaded fixing mode. Further, by adjusting the rotation amount of the first threaded member, the expansion amount of the expansion member can be controlled, so as to be suitable for patients with different bone conditions. Still further, if the anchor appears to be loose, the fixing strength is reduced, etc., the expansion member can be further expanded by driving the first threaded member to rotate again to realize re-fixing, which is convenient and fast for revision surgery. In addition, when the expansion member is in the initial state without expanding outward and within the initial circumferential envelope contour, it can be ensured that the expansion type suture anchor will not be hindered by the expansion member to cause jamming during being nailed into the bone, and it is convenient to nail in. In the scene where the expansion type suture anchor needs to be removed, the expansion member will not hinder the expansion type suture anchor from being smoothly pulled out of the bone. BRIEF DESCRIPTION OF DRAWINGS

[0025] Those skilled in the art will understand that the provided drawings are for the purpose of better illustrating the present application and do not constitute any limitation on the scope of the present application. Among them:

[0026] Figure 1 is a schematic diagram of an expansion type suture anchor system of an embodiment of the present application, wherein the expansion member is not expanded;

[0027] Figure 2 is a schematic diagram of an expansion type suture anchor system of an embodiment of the present application, wherein the expansion member is expanded;

[0028] Figure 3 is an axial cross-sectional schematic diagram of an operating tool of an embodiment of the present application;

[0029] Figure 4 is a schematic diagram of an expansion type suture anchor of an embodiment of the present application, wherein the expansion member is not expanded;

[0030] Figure 5 is Figure 4 an axial cross-sectional schematic diagram of the expansion type suture anchor shown in;

[0031] Figure 6 is Figure 4 a schematic diagram of the expansion member of the expansion type suture anchor shown in after expansion;

[0032] Figure 7 is a schematic diagram of an expansion type suture anchor of another example of an embodiment of the present application, wherein the expansion member is not expanded;

[0033] Figure 8 is Figure 7 an axial cross-sectional schematic diagram of the expansion type suture anchor shown in;

[0034] Figure 9 isFigure 7 a schematic view of the expansion member of the expansion suture anchor after expansion;

[0035] Figure 10 is Figure 9 a schematic view of the axial section of the expansion suture anchor;

[0036] Figure 11 is a schematic view of the expansion suture anchor of another example of the present application, wherein the expansion member is not expanded;

[0037] Figure 12 is Figure 11 a schematic view of the axial section of the expansion suture anchor;

[0038] Figure 13 is Figure 11 a schematic view of the expansion member of the expansion suture anchor after expansion;

[0039] Figure 14 is Figure 13 a schematic view of the axial section of the expansion suture anchor;

[0040] Figure 15 is Figure 11 a schematic view of the second threaded member and the second articulation in the expansion suture anchor;

[0041] Figure 16 is Figure 11 a schematic view of the expansion member in the expansion suture anchor;

[0042] Figure 17 is Figure 11 a schematic view of the first threaded member in the expansion suture anchor;

[0043] Figure 18 is Figure 11 a schematic view of the first articulation in the expansion suture anchor.

[0044] In the drawings:

[0045] 1 - expansion suture anchor; 11 - first threaded member; 111 - connecting portion; 112 - threading hole; 113 - accommodating cavity; 114 - recess; 12 - second threaded member; 121 - rotation limiting structure; 13 - expansion member; 131 - first end; 132 - second end; 133 - inclined surface; 134 - hinge hole; 135 - hinge; 136 - anti-skid structure; 14 - axial position limiting platform; 15 - extrusion portion; 16 - expansion limiting member; 17 - first articulation; 171 - rotation shaft; 172 - circumferential position limiting portion; 18 - second articulation; 2 - operating tool; 20 - through hole; 21 - sleeve; 22 - handle; 23 - scale; 3 - suture. DETAILED DESCRIPTION

[0046] To make the objectives, advantages, and features of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the embodiments of this invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may emphasize different aspects and may sometimes use different scales.

[0047] As used herein, the singular forms “a,” “an,” and “the” include plural objects; the term “or” is generally used to mean “and / or”; the term “a number” is generally used to mean “at least one”; and the term “at least two” is generally used to mean “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature; “one end” and “the other end,” and “proximal end” and “distal end” generally refer to two corresponding parts, which include not only endpoints. The terms “proximal end” and “distal end” are defined herein in relation to an expansion-stretched wire anchor having an end for insertion into the human body and a driving end for connection to an operating tool. The term "proximal" refers to the position of the element closer to the operating tool, and the term "distal" refers to the position of the element closer to the end inserted into the human body and therefore further away from the operating tool. Optionally, in manual or hand-operated applications, the terms "proximal" and "distal" are defined herein relative to the operator, such as a surgeon or clinician. The term "proximal" refers to the position of the element closer to the operator, and the term "distal" refers to the position of the element closer to the expansion anchor and therefore further away from the operator. Furthermore, as used in this invention, "installed," "connected," "attached," and "set" of one element on another should be interpreted broadly, generally indicating only a connection, coupling, mating, or transmission relationship between the two elements, which can be direct or indirect through an intermediate element, and should not be construed as indicating or implying a spatial positional relationship between the two elements, i.e., one element can be located inside, outside, above, below, or to one side of the other element, unless otherwise expressly stated. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, directional terms such as above, below, up, down, upward, downward, left, right, etc., are used relative to exemplary embodiments as they are shown in the figures, with upward or up direction pointing towards the top of the corresponding figure, and downward or down direction pointing towards the bottom of the corresponding figure.

[0048] The present application aims to provide an inflatable suture anchor and an inflatable suture anchor system to solve the problem of the existing suture anchor being prone to loosening and dislodging. The following description is made with reference to the accompanying drawings.

[0049] Please refer to Figures 1 to 3 , the present application provides an inflatable suture anchor system, which comprises an inflatable suture anchor 1, an operating tool 2 and a suture 3. The inflatable suture anchor 1 is capable of radial expansion or contraction, so as to be used for anchoring on a bone. The distal end of the operating tool 2 (the lower left end in the figure) Figure 1 、 Figure 2 is detachably connected with the inflatable suture anchor 1 and is used for driving the inflatable suture anchor 1 to expand or contract radially. The distal end of the suture 3 is movably connected with the inflatable suture anchor 1 (for example, movably threaded on the first threaded member 11, which will be described below), and the proximal end of the suture 3 extends through the operating tool 2. For this purpose, as shown in the figure, the operating tool 2 has a through hole 20 penetrating through the axial direction of the operating tool 2, which allows the suture 3 to pass through. Optionally, the operating tool 2 further comprises a handle 22, which facilitates the operator to hold and operate. The operating tool 2 further comprises a scale 23, which is used for the operator to observe the implantation depth of the inflatable suture anchor 1. Figure 3

[0050] Please refer to Figures 4 to 6 , in order to realize the driving of the inflatable suture anchor 1 by the operating tool 2 to expand or contract radially, the present application provides the inflatable suture anchor 1, which comprises a first threaded member 11, a second threaded member 12 and an expansion member 13; the first threaded member 11 and the second threaded member 12 are threadedly connected along the direction of an axis A, the first threaded member 11 is used to rotate around the axis A under the driving of the operating tool 2; when the first threaded member 11 is driven to rotate relative to the second threaded member 12, it is converted into relative movement along the direction of the axis A through the thread, and the relative movement of the first threaded member 11 and the second threaded member 12 along the direction of the axis A causes the expansion member 13 to expand outwardly along a direction perpendicular to the axis A, so as to be anchored on a bone.

[0051] One of the first threaded member 11 and the second threaded member 12 has external threads, and the other has matching internal threads, so that the first threaded member 11 and the second threaded member 12 can be threadedly connected. In the exemplary embodiment shown in the figure, the first threaded member 11 has external threads, and the second threaded member 12 has internal threads. Of course, in some other embodiments, the first threaded member 11 can have internal threads, and the second threaded member 12 can have external threads, which is not limited in the present application. Figures 4 to 6

[0052] ​​Understandably, when the first threaded component 11 is driven to rotate relative to the second threaded component 12, based on their threaded connection, they will produce relative movement along axis A. Of course, depending on the direction of rotation, this relative movement can be either closer together or further apart. For ease of description, this paper uses the second threaded component 12 as the reference point. When the first threaded component 11 rotates in the forward direction, its movement relative to the second threaded component 12 is called forward movement, such as moving closer together. When the first threaded component 11 rotates in the reverse direction, its movement relative to the second threaded component 12 is called reverse movement, such as moving further apart. Of course, forward and reverse rotation here only represent a set of opposite rotation directions and do not necessarily require either to be clockwise or counterclockwise. Similarly, forward and reverse movement only represent a set of opposite movement directions along axis A and do not necessarily require either to be closer together or further apart.

[0053] It should be further clarified that the relative movement of the first threaded member 11 and the second threaded member 12 causes the expansion member 13 to expand. The word "causes" here only expresses a causal relationship and does not imply that the expansion of the expansion member 13 is driven by the first threaded member 11 and the second threaded member 12. In some embodiments, the expansion member 13 does not expand when not driven by an external force; the relative movement of the first threaded member 11 and the second threaded member 12 causes the expansion member 13 to expand through a mechanically connected force (such as compression or tension). In other embodiments, the expansion member 13 has self-expanding characteristics, and the relative movement of the first threaded member 11 and the second threaded member 12 can release its self-expanding limitation. In this case, the self-expanding of the expansion member 13 should also be considered as expansion caused by the relative movement of the first threaded member 11 and the second threaded member 12. Optionally, at least some or all of the components in the entire expandable wire anchor 1 may be made of materials such as stainless steel, titanium alloy, or nickel-titanium shape memory alloy.

[0054] like Figures 4 to 6 As shown, in an alternative example, the first threaded member 11 rotates in the forward direction. When the first threaded member 11 moves relatively closer to the second threaded member 12, the expansion member 13 is compressed and bends outward, expanding to achieve expansion. It is understood that in other embodiments, depending on the different positions and arrangements of the expansion member 13, the first threaded member 11 may rotate in the reverse direction. When the first threaded member 11 moves relatively away from the second threaded member 12, the expansion member 13 may be compressed and expand. This invention is not limited to this.

[0055] Optionally, the expandable anchor 1 includes at least two expansion members 13, which are circumferentially distributed around the axis A, preferably evenly distributed, to provide uniform fixation in the circumferential direction. Figures 4 to 6In the shown example, the expandable suture anchor 1 comprises four expanders 13. In other embodiments, the expanders 13 can also be three or more. Of course, in some application scenarios, the expanders 13 can also be only one, and the present application is not limited thereto.

[0056] Optionally, the second threaded member 12 has a pointed end distal to the first threaded member 11. The distal end of the second threaded member 12 is pointed, and the expandable suture anchor 1 can be directly hammered into the bone without the need to pre-drill a hole in the bone surface, thereby reducing the operation steps and shortening the operation time.

[0057] Optionally, the second threaded member 12 has a rotation limiting structure 121 on the outer periphery. In use, the distal end of the second threaded member 12 is first hammered into the bone, and then the first threaded member 11 is rotated to cause the expansion of the expanders 13. It can be understood that the first threaded member 11 needs to be relatively rotated with the second threaded member 12 in the circumferential direction. The rotation limiting structure 121 can limit the circumferential rotation of the second threaded member 12, so as to avoid the second threaded member 12 from rotating and failing to cause the expansion of the expanders 13. The rotation limiting structure 121 can be, for example, a groove or a protrusion provided on the outer surface of the second threaded member 12, and can be configured by those skilled in the art according to actual needs. Preferably, in combination with the hammering and hammering mode of the second threaded member 12, the rotation limiting structure 121 comprises a plurality of anti-skid grooves opened in a direction parallel to the axis A, and the plurality of anti-skid grooves are preferably evenly distributed in the circumferential direction around the axis A.

[0058] Further, the expandable suture anchor 1 has an initial circumferential envelope contour, which is the combination of the maximum outer contour of the first threaded member 11 along the axis A and the maximum outer contour of the second threaded member 12 along the axis A. The expanders 13 are in an initial state when not expanded, and the expanders 13 do not exceed the initial circumferential envelope contour when in the initial state. It should be noted that, in the case where the maximum outer contour of the first threaded member 11 (referring to the maximum outer contour in the circumferential direction) is the same as the maximum outer contour of the second threaded member 12, the initial circumferential envelope contour is the extension shape of the maximum outer contour of the first threaded member 11 (or the second threaded member 12) along the axis A, for example Figures 4 to 6In the shown example, the maximum outer contour of the first threaded member 11 is identical to the maximum outer contour of the second threaded member 12, both are circular, and the initial circumferential envelope contour is a cylinder obtained by extending the circle along the axis A. In the case where the maximum outer contour of the first threaded member 11 is not identical to the maximum outer contour of the second threaded member 12, the initial circumferential envelope contour is the shape obtained by extending the larger one of the two contours along the axis A. When the expansion member 13 is in the initial state, it does not exceed the initial circumferential envelope contour, which ensures that the expansion suture anchor 1 will not be blocked by the expansion member 13 during the process of being driven into the bone, and thus facilitates the driving. In addition, in the case where the expansion suture anchor 1 needs to be removed, the expansion member 13 will not block the expansion suture anchor 1 from being removed from the bone.

[0059] In some embodiments, the expansion suture anchor 1 can be configured to be used once and then expanded, and after the expansion, the expansion member 13 cannot be restored to the initial state, so that the expansion suture anchor 1 is permanently implanted in the bone. In other embodiments, the expansion suture anchor 1 can be configured to be adjustable or removable, i.e. after the expansion, the expansion member 13 can be retracted under certain conditions, and even restored to the initial state. Optionally, when the first threaded member 11 is driven to rotate in the opposite direction relative to the second threaded member 12, the relative opposite movement of the first threaded member 11 and the second threaded member 12 along the axis A causes the expansion member 13 to retract inwardly along a direction perpendicular to the axis A. It should be noted that, as described above, the opposite rotation of the first threaded member 11 relative to the second threaded member 12 is the opposite rotation direction relative to the positive rotation, i.e. rotating the first threaded member 11 in the opposite direction to the direction that causes the expansion member 13 to expand, which can cause the expansion member 13 to retract.

[0060] Please continue to refer to Figures 4 to 6 , and in combination with Figure 3 Optionally, the first threaded member 11 has a connecting portion 111 adapted to the operation tool 2, the connecting portion 111 extends along the axis A and has a threading hole 112 penetrating in a direction at an angle to the axis A. Since the expansion suture anchor 1 is mainly used to be driven into the bone along the axis A, for the convenience of operation and driving, the connecting portion 111 is preferably arranged at the proximal end surface of the first threaded member 11 and extends towards the proximal end, so as to facilitate the connection of the operation tool 2 thereto. Optionally, the cross-sectional shape of the connecting portion 111 in the direction perpendicular to the axis A is non-circular, so as to facilitate the transmission of torque. In Figures 4 to 6In the shown example, the cross-sectional shape of the connecting portion 111 is substantially hexagonal. Correspondingly, the distal end of the operating tool 2 is provided with a sleeve 21, for example a hexagonal socket, which matches the cross-sectional shape of the connecting portion 111. In this way, after the sleeve 21 is sleeved on the connecting portion 111, rotating the operating tool 2 can drive the first threaded member 11 to rotate around the axis A. It can be understood that the above-mentioned hexagonal connecting portion 111 and sleeve 21 are only an example and not a limitation on the shape of the connecting portion 111 and the sleeve 21. In other embodiments, the cross-section of the connecting portion 111 and the sleeve 21 can also be other shapes, such as triangular, quadrilateral, etc. regular polygon, one character type, cross type, plum blossom type, star type, etc. common shapes that can be used for torque transmission.

[0061] Further, the threading hole 112 is provided on the connecting portion 111 in a direction at an angle to the axis A, for threading the suture 3. Preferably, the through direction of the threading hole 112 is perpendicular to the axis A. It can be understood that based on the application requirements of the inflatable suture anchor 1, on the one hand it needs to be able to be anchored stably on the bone, and on the other hand the inflatable suture anchor 1 also needs to be able to be reliably connected with the suture 3. Threading the suture 3 in the threading hole 112 can simply achieve the connection of the suture 3 with the inflatable suture anchor 1.

[0062] Further, the connecting portion 111 has a receiving cavity 113 extending in the direction of the axis A, the receiving cavity 113 communicates with the threading hole 112, and the cross-sectional dimension of the receiving cavity 113 in the direction perpendicular to the axis A is not less than the cross-sectional dimension of the suture 3, so as to allow the suture 3 to be accommodated therein. For ease of operation, the suture 3 is often threaded in the threading hole 112 before the inflatable suture anchor 1 is driven into the bone. Therefore, the connection of the operating tool 2 with the connecting portion 111 occurs after the suture 3 is threaded. The provision of the receiving cavity 113 allows the suture 3 to be accommodated in the parallel section of the connecting portion 111, so that the suture 3 can be avoided from being squeezed and cut off when the sleeve 21 is sleeved on the connecting portion 111 due to the shape matching of the two. As shown in Figure 4 and Figure 6 In a preferred example, the receiving cavity 113 is a groove recessed in the connecting portion 111. Of course, in some other embodiments, the receiving cavity 113 can also be a blind hole opened in the direction parallel to the axis A, with the proximal end being open and the distal end communicating with the threading hole 112.

[0063] The inflatable suture anchor 1 provided by the present embodiment will be further described below in combination with several examples.

[0064] Please continue to refer to Figures 4 to 10In some embodiments, one of the first threaded member 11 and the second threaded member 12 has an axial limiting platform 14, and the other of the first threaded member 11 and the second threaded member 12 has a pressing portion 15; the expansion member 13 has a first end 131 and a second end 132 opposite to each other along the axis A, the first end 131 abutting against the axial limiting platform 14, and the second end 132 being a free end; when the first threaded member 11 and the second threaded member 12 move relative to each other along the direction of the axis A, the pressing portion 15 causes the expansion member 13 to expand outward by pressing the second end 132 and / or the inner wall of the expansion member 13. Optionally, the expansion member 13 itself does not have self-expanding properties, and its expansion is achieved based on the pressing of the first threaded member 11 and the second threaded member 12.

[0065] exist Figures 4 to 6 In the illustrated example, the first threaded member 11 has an axial limiting platform 14, and the second threaded member 12 has a pressing portion 15. Figures 7 to 10 In another example shown, with Figures 4 to 6 In contrast to the example shown, the first threaded member 11 has a pressing portion 15, and the second threaded member 12 has an axial limiting platform 14. It is understood that, due to the different pressing directions in the two examples, the first end 131 and the second end 132 of the expansion member 13 are also opposite.

[0066] The axial limiting platform 14 and the pressing part 15 are respectively arranged to protrude outward in a direction perpendicular to axis A, and the expansion member 13 is disposed between the axial limiting platform 14 and the pressing part 15. The axial limiting platform 14 can restrict the position of the expansion member 13 along axis A by abutting against it. When the pressing part 15 moves toward the axial limiting platform 14, it first abuts against and presses the second end 132, and then can continue to press the inner wall of the expansion member 13, thus pushing the expansion member 13 outward and causing it to expand. In this way, when the first threaded member 11 rotates in the forward direction, the first threaded member 11 moves relatively closer to the second threaded member 12, the distance between the axial limiting platform 14 and the pressing part 15 decreases, causing the expansion member 13 to be pressed and bend outward, thus achieving expansion. Figures 4 to 6 The illustrated example is merely one illustration of the positional relationship between the extrusion part 15 and the expansion member 13. In other embodiments, the extrusion part 15 may only extrude the second end 132 of the expansion member 13 from beginning to end without entering the interior of the expansion member 13. In this case, the expansion member 13 preferably has a predetermined curved shape, and when the second end 132 is extruded, the expansion member 13 bends outward along the predetermined curved shape to achieve expansion. Of course, in other embodiments, the extrusion part 15 may also extrude the inner wall of the expansion member 13 from beginning to end; this embodiment is not limited to this.

[0067] Preferably, the inflatable suture anchor 1 further comprises a limiting expansion member 16 for limiting the expansion of the first end 131 away from the axis A. The limiting expansion member 16 is configured to prevent the first end 131 of the expansion member 13 from being completely extruded and dropped off. In one embodiment, the limiting expansion member 16 is a sleeve, and the first end 131 of the expansion member 13 is fixed to the sleeve, so that the first end 131 of the expansion member 13 is indirectly abutted against the axial limiting stop 14 via the sleeve. Preferably, the limiting expansion member 16 is integrally formed with the expansion member 13. Figures 4 to 6 In the illustrated exemplary embodiment, the expansion member 13 and the limiting expansion member 16 are integrally formed, for example, by cutting a raw tube to form the expansion member 13 and leaving a section uncut to form the limiting expansion member 16. This integral forming method is convenient to manufacture. Of course, in other embodiments, the limiting expansion member 16 can be an additional separate member, such as a wire ring, which is sleeved outside the expansion member 13 and which also has the effect of limiting expansion.

[0068] Optionally, at least one of the extruding portion 15 and the second end 132 has an inclined surface 133 which is inclined inwardly towards the extruding direction. It should be noted that the extruding direction herein refers to the moving direction of the first screw member 11 which can extrude and cause the expansion member 13 to expand. Specifically, in the illustrated exemplary embodiment, the extruding direction of the extruding portion 15 is the proximal direction, and the extruding direction of the second end 132 is the distal direction. Figure 5 In the illustrated exemplary embodiment of the inflatable suture anchor 1, when the extruding portion 15 moves towards the proximal direction (i.e. the right direction in the middle of the figure), the extruding portion 15 can extrude and cause the expansion member 13 to expand, so that the extruding direction of the extruding portion 15 is the proximal direction, and the inclined surface 133 is inclined inwardly towards the proximal direction, i.e. towards the axis A. Figure 5 It should be understood that the inclined surface 133 can be provided on either the extruding portion 15 or the second end 132, or on both. The provision of the inclined surface 133 can reduce the resistance of extrusion and expansion, and facilitate the expansion of the second end 132.

[0069] Further, the inclined surface 133 of the second end 132 has an additional effect. Due to the provision of the inclined surface 133, the second end 132 forms a sharp angle, which can facilitate the penetration of the second end 132 into the bone when the second end 132 is extruded and expanded outwardly.

[0070] Please refer to Figures 11 to 18In some embodiments, the expandable suture anchor 1 comprises a first hinge 17 and a second hinge 18, the first hinge 17 is rotatably arranged on the first screw 11 along the axis A, the second hinge 18 is arranged on the second screw 12, and the expansion member 13 is rotatably connected to the first hinge 17 and the second hinge 18 at two ends thereof along the axis A. Further, the first hinge 17 is limited in position along the axis A relative to the first screw 11, and the second hinge 18 is limited in position along the axis A relative to the second screw 12. As can be understood, since the expansion member 13 is connected to the first hinge 17 and the second hinge 18 at two ends thereof along the axis A, the relative movement between the first screw 11 and the second screw 12 will drive the middle portion of the expansion member 13 to bend outwardly to form expansion, as shown in Figure 13 and Figure 14 .

[0071] Further, since the first hinge 17 is rotatable relative to the first screw 11, when the first screw 11 rotates, the first hinge 17 can not follow the rotation, thereby decoupling the rotational freedom between the first hinge 17 and the first screw 11. Please refer to Figure 17 , Figure 18 , and in combination with Figure 13 , in an alternative exemplary embodiment, the first screw 11 has a circumferential groove 114, the first hinge 17 is rotatably engaged in the groove 114 along the axis A and is limited in position along the axis A by the groove 114. Of course, in other embodiments, the rotational connection between the first hinge 17 and the first screw 11 is not limited to the engagement by the groove 114, and those skilled in the art can configure it according to the actual situation.

[0072] Please continue to refer to Figure 15 , Figure 16 and Figure 18 . Optionally, the first hinge 17 and / or the second hinge 18 comprises a hinge shaft 171 curved around the axis A, the expansion member 13 has a hinge hole 134 matched with the hinge shaft 171, and the expansion member 13 is rotatably sleeved on the hinge shaft 171 through the hinge hole 134. Preferably, the expansion member 13 has a certain arc in the circumferential direction around the axis A, and the hinge shaft 171 also has a certain arc to present a curved shape, as shown in Figure 15 and Figure 18 . It should be noted that although the hinge shaft 171 has a certain arc, it is still perpendicular to the axis A as a whole. In matching, as shown in Figure 16As shown, the hinge hole 134 also has a certain curvature in the circumferential direction around axis A.

[0073] Please continue to refer to this. Figure 15 , Figure 16 and Figure 18 Optionally, the first hinge portion 17 and / or the second hinge portion 18 have a circumferential limiting portion 172, and the expansion member 13 includes a hinge joint 135, with the hinge hole 134 formed on the hinge joint 135; the circumferential limiting portion 172 is used to limit the circumferential position of the hinge joint 135 about the axis A relative to the first hinge portion 17 and / or the second hinge portion 18. The provision of the circumferential limiting portion 172 can limit the relative circumferential position of the expansion member 13 relative to the second threaded member 12, thereby reducing or preventing the expansion member 13 from rotating with the first threaded member 11.

[0074] In one example, the expandable anchor 1 includes four expanders 13, which are evenly distributed circumferentially around axis A. Correspondingly, the first hinge portion 17 includes four pivots 171 and four circumferential limiting portions 172, which are arranged alternately and evenly in sequence.

[0075] Furthermore, the outer surface of the expansion member 13 away from the axis A has an anti-slip structure 136. Figures 4 to 10 The examples shown are different because Figures 11 to 18 In the illustrated embodiment, the expansion member 13 is connected to the second threaded member 12 via the second hinge member 18, and their circumferential rotation is further restricted by the circumferential limiting part 172. Therefore, the rotation of the second threaded member 12 can be restricted by limiting the rotation of the expansion member 13. Furthermore, an anti-slip structure 136 is provided on the outer surface of the expansion member 13, which effectively restricts the circumferential rotation of the expansion member 13 after it is inserted into the bone. This is equivalent to restricting the rotation of the second threaded member 12, at which point rotating the first threaded member 11 can easily drive the expansion member 13 to expand or contract. Thus, Figures 11 to 18 In the illustrated embodiment, the rotation limiting structure 121 may not be provided on the second threaded component 12.

[0076] In summary, the expansion type suture anchor and the expansion type suture anchor system provided by the application, the expansion type suture anchor is used for anchoring on a bone, and comprises a first threaded member, a second threaded member and an expansion member; the first threaded member is threadedly connected with the second threaded member in the direction of an axis, the first threaded member is used for rotating around the axis under the driving of an operating tool; when the first threaded member is driven to rotate relative to the second threaded member, the relative movement of the first threaded member and the second threaded member in the direction of the axis is caused by the thread conversion into the relative movement in the direction perpendicular to the axis, so that the expansion member is expanded outward in the direction perpendicular to the axis to be anchored on the bone; wherein the expansion type suture anchor has an initial circumferential envelope contour, and when the expansion member is not expanded outward and is in an initial state, does not exceed the initial circumferential envelope contour. In this way, by driving the first threaded member to rotate, the expansion member can be expanded to be embedded in the bone, so that the problems of easy loosening and easy pulling out existing in the threaded fixing mode are avoided. Further, by adjusting the rotation amount of the first threaded member, the expansion amount of the expansion member can be controlled, so that the patients with different bone conditions can be adapted. Still further, if the anchor appears loosening, the fixing strength is reduced and the like, the expansion member can be further expanded by driving the first threaded member to rotate again to realize refixing, so that the revision operation is convenient and fast. In addition, since when the expansion member is not expanded outward and is in the initial state, does not exceed the initial circumferential envelope contour, it can be ensured that the expansion type suture anchor will not be hindered by the expansion member to cause jamming in the process of being nailed into the bone, and is convenient to nail. In the scene where the expansion type suture anchor needs to be removed, the expansion type suture anchor will not be hindered by the expansion member and can be smoothly pulled out from the bone.

[0077] It should be noted that the above several embodiments can be combined with each other. The above description is only a description of the preferred embodiments of the application, and does not limit the scope of the application in any way. Any modification and change made by a person skilled in the art according to the above disclosure is within the protection scope of the claims.

Claims

1. An expandable suture anchor for anchoring to bone, characterized in that, include: First threaded component, second threaded component, and expansion component; The first threaded component and the second threaded component are threadedly connected along an axis, and the first threaded component is used to rotate around the axis under the drive of the operating tool; When the first threaded member is driven to rotate relative to the second threaded member, the rotation is converted into relative movement along the axis direction by the thread. The relative movement of the first threaded member and the second threaded member along the axis direction causes the expansion member to expand outward in a direction perpendicular to the axis direction to anchor it to the bone. The expandable anchor with wire has an initial circumferential envelope profile, and when the expandable part is in its initial state without expanding outward, it does not exceed the initial circumferential envelope profile. The end of the second threaded member away from the first threaded member is a sharp end, which is configured to be driven into the bone by a hammering motion; the outer periphery of the second threaded member has a rotation-limiting structure.

2. The expansion-type anchor with wire as described in claim 1, characterized in that, The expandable anchor bolt includes at least two expansion members, which are circumferentially distributed around the axis.

3. The expansion-type anchor bolt with wire as described in claim 1, characterized in that, When the first threaded component is driven to rotate in the opposite direction to the second threaded component, the relative opposite movement of the first threaded component and the second threaded component along the axis causes the expansion component to contract inward in a direction perpendicular to the axis.

4. The expansion-type anchor bolt with wire as described in claim 1, characterized in that, The first threaded component has a connecting portion adapted to the operating tool, the connecting portion extending along the axis and having a through hole extending in a direction at an angle to the axis.

5. The expansion-type anchor bolt with wire according to claim 4, characterized in that, The connecting portion has a receiving cavity extending along the axis, the receiving cavity communicating with the thread hole, and the cross-sectional dimension of the receiving cavity perpendicular to the axis is not less than the cross-sectional dimension of the suture, so as to allow the suture to be received therein.

6. The expansion-type anchor bolt with wire as described in claim 1, characterized in that, One of the first threaded component and the second threaded component has an axial limiting platform, and the other of the first threaded component and the second threaded component has a pressing portion; the expansion component has a first end and a second end opposite to each other along the axis, the first end abutting against the axial limiting platform, and the second end being a free end; when the first threaded component and the second threaded component move relative to each other along the axis, the pressing portion causes the expansion component to expand outward by pressing the second end and / or the inner wall of the expansion component.

7. The expansion-type anchor bolt with wire according to claim 6, characterized in that, At least one of the extrusion section and the second end has an inclined surface, which is inclined inward toward the extrusion direction.

8. The expansion-type anchor bolt with wire according to claim 6, characterized in that, The expandable anchor also includes a limiting element for restricting the expansion of the first end in a direction away from the axis.

9. The expansion-type anchor bolt with wire according to claim 1, characterized in that, The expandable anchor with a strip includes a first hinge portion and a second hinge portion arranged in a direction perpendicular to the axis. The first hinge portion is rotatably disposed on the first threaded member around the axis, and the second hinge portion is disposed on the second threaded member. The expansion member is rotatably connected to the first hinge portion and the second hinge portion at both ends along the axis, respectively.

10. The expansion-type anchor bolt with wire according to claim 9, characterized in that, The first hinge portion and / or the second hinge portion includes a pivot bending about the axis, the expansion member having a hinge hole adapted to the pivot, and the expansion member being rotatably fitted onto the pivot through the hinge hole.

11. The expansion-type anchor bolt with wire according to claim 10, characterized in that, The first hinge portion and / or the second hinge portion have a circumferential limiting portion, the expansion member includes a hinge joint, and the hinge hole is formed on the hinge joint; the circumferential limiting portion is used to limit the circumferential position of the hinge joint relative to the first hinge portion and / or the second hinge portion around the axis.

12. The expansion-type anchor bolt with wire according to claim 9, characterized in that, The first threaded part has a circumferential groove, and the first hinge portion is rotatably engaged in the groove about the axis and is restricted by the groove to position along the axis.

13. The expansion-type anchor bolt with wire according to claim 9, characterized in that, The outer surface of the expansion member away from the axis has an anti-slip structure.

14. An expansion-type wire anchor system, characterized in that, The device includes an expandable anchor with thread according to any one of claims 1 to 13, and further includes a thread and an operating tool, the thread being movably threaded through the first threaded member, the operating tool having a through hole extending along its own axial direction, the through hole allowing the thread to pass through.

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