Tandem knotting-free suture anchor

Abstract

The invention provides a tandem knotting-free suture anchor which comprises an operating rod and a suture, and a first anchor, a second anchor and a third anchor are sequentially arranged on the operating rod from bottom to top in a penetrating manner; the operating rod is of a hollow pipe structure and is opened up and down, the front end of the first anchor extends out of the operating rod, and the middle of the suture is fixed inside the front end of the first anchor; the first end of the suture penetrates out of the operating rod from the position, located between the first anchor and the second anchor, of the operating rod, penetrates into the operating rod from the position, located between the second anchor and the third anchor, of the operating rod and penetrates out of the top end of the operating rod. The second end of the suture penetrates out of the operating rod from the position, located between the second anchor and the third anchor, of the operating rod and penetrates into the operating rod from the position, located above the third anchor, of the operating rod. And an anchor limiting device is arranged in the operating rod. The anchor and the suture are pre-assembled on the same operating rod in series, so that the number of wounds on the surface of the skin can be reduced, and the operation steps of performing an operation by using the suture anchor can be greatly simplified.

Description

Technical Field

[0001] The invention relates to the technical field of medical anchor nails, in particular to a series-type knot-free suture anchor nail. Background Art

[0002] In the field of modern orthopedic minimally invasive surgery, especially in the field of sports medicine, suture anchors are widely used. Due to their advantages such as minimally invasiveness and good prognosis, they are playing an increasingly important role in the repair of avulsion fractures and soft tissue tears.

[0003] Surgeons use suture anchors to fix tissues or fractured bones. Usually, surgeons use one implant device for one suture anchor. First, they implant a suture anchor (with sutures fixed inside the anchor, and the two ends (tails) of the sutures are free), remove the implant device, enter the wire guide, pass the tail through the tissue to be fixed, tighten it, and then tie a knot to fix the tissue.

[0004] In order to further fix the avulsed tissue (tendon) to the bone, double-row anchor technology is currently used more frequently. Usually, there are two rows of four anchors, which are distributed on the inner and outer sides of the end point of the tissue to be fixed. In this process, the same operation of implanting the anchor - passing through the tissue - tying the knot to fix it needs to be performed separately four times.

[0005] The latest research currently recommends the double-row anchor suture bridge technology, which has been maturely applied. The two inner row anchors are suture anchors, and the two outer row anchors are sutureless. After the inner row tail wire is passed through the tendon, the tail wire is squeezed between the anchor and the bone during the implantation of the outer row anchor, so that the inner row anchor and the outer row anchor form a bridge connected by sutures, and the sutures are pressed on the surface of the tendon to form a fixed structure. This technology is also used to cover the surface of the fracture fragment to fix the fracture fragment.

[0006] However, most of the current suture anchors are assembled in a split type, with one anchor assembled on an operating rod. The surgeon holds the operating rod and implants the anchor at the target position, then removes the operating rod and replaces it for the next operation. Each time the anchor is implanted, a separate process of entering, implanting, and withdrawing the operating rod is required. The suture anchor requires a wire guide to guide the tail wire and tie a knot.

[0007] When the fracture fragment to be fixed is small, the fixation method of double-row 4 anchor suture bridge is difficult to implement due to the small diameter of the fracture fragment. If there is also a small operating space, a small surgical field of view, and the operator is unskilled in operation, the fixation effect of the anchor and the prognosis of the human body will be adversely affected, which is not conducive to the patient's subsequent functional rehabilitation.

[0008] Chinese patent CN202321291391.8 discloses a prefabricated locking sliding knot anchor with a thread, which consists of an operating rod and two anchors. The suture is tightened and fixed by a preset sliding knot. However, the two anchors can only form a fixed structure shaped like a "line segment", which is difficult to firmly fix tissues and fracture fragments; at the same time, it is not a true "knot-free" setting; in addition, it does not propose a clear solution to the problem of how to avoid the second anchor from loosening freely on the operating rod due to the force when the first anchor is implanted. Summary of the invention

[0009] In order to solve the above problems in the prior art, the present invention provides a serial knot-free suture anchor.

[0010] The present invention is achieved through the following technical solutions:

[0011] A serial knot-free suture anchor comprises an operating rod and a suture, wherein a first anchor, a second anchor and a third anchor are sequentially penetrated on the operating rod from bottom to top; the operating rod is a hollow tube structure with upper and lower openings, the front end of the first anchor extends out of the operating rod, and the middle part of the suture is fixed inside the front end of the first anchor; the first end of the suture passes through the outside of the operating rod from a position where the operating rod is located between the first anchor and the second anchor, and passes into the operating rod from a position where the operating rod is located between the second anchor and the third anchor, and passes out from the top end of the operating rod; the second end of the suture passes through the outside of the operating rod from a position where the operating rod is located between the second anchor and the third anchor, and passes into the operating rod from a position where the operating rod is located above the third anchor; an anchor limiting device is arranged inside the operating rod, and the anchor limiting device is used to control the locking and movement of the second anchor and the third anchor.

[0012] Preferably, the anchor limiting device comprises: a first anchor limiting device and a second anchor limiting device; the first anchor limiting device is used to control the locking and movement of the second anchor, and the second anchor limiting device is used to control the locking and movement of the third anchor;

[0013] The first anchor limiting device includes a first straight rod located in an operating rod, two pins are connected to the lower end of the first straight rod, a first platform is fixed in the operating rod, a first slider is slidably arranged on the first platform, a first limiting spring is arranged between the first side surface of the first slider and the inner wall of the operating rod, a first positioning pin is connected to the second side surface of the first slider opposite to the first side surface, and a pin hole matching the first positioning pin is arranged at a corresponding position on the operating rod; sliding grooves corresponding to the two pins are arranged on the third side surface and the fourth side surface of the first slider, the sliding grooves are arranged at an acute angle to the first side surface, and each pin is slidably inserted into a corresponding sliding groove; the third side surface and the fourth side surface are perpendicular to the first side surface; the structure of the second anchor limiting device is the same as that of the first anchor limiting device.

[0014] Furthermore, a connecting plate is connected to the lower end of the first straight rod, and the bottom of the connecting plate is connected to two latches via two vertical arms.

[0015] Furthermore, the first anchor limiting device includes a pressing mechanism located at the rear end of the operating rod, and the upper end of the first straight rod is connected to the pressing mechanism.

[0016] Furthermore, the pressing mechanism includes a limit plate, a pressing spring and a pressing plate, the limit plate is fixed on the inner wall of the operating rod, the pressing spring is located between the limit plate and the pressing plate, and one end of the first straight rod passes through the limit plate and the pressing spring and is connected to the pressing plate.

[0017] Preferably, the anchor limiting device comprises: a first spring sheet and a second spring sheet, the first spring sheet is used to control the locking and movement of the second anchor, and the second spring sheet is used to control the locking and movement of the third anchor;

[0018] A spring sheet receiving opening is provided at the position of the operating rod corresponding to the first spring sheet, one end of the first spring sheet is connected to the top of the spring sheet receiving opening, and the other end of the first spring sheet extends out of the spring sheet receiving opening; the structure of the second spring sheet is the same as that of the first spring sheet.

[0019] Furthermore, the first spring sheet includes a first section of spring sheet and a second section of spring sheet; one end of the first section of spring sheet is connected to the top of the spring sheet receiving opening, and the other end is connected to one end of the second section of spring sheet through a circular arc transition section, and the bending directions of the first section of spring sheet and the second section of spring sheet are the same.

[0020] Furthermore, two first spring sheets are provided, and the two first spring sheets are arranged opposite to each other.

[0021] Furthermore, a fixing rod perpendicular to the axis of the first anchor is provided inside the front end of the first anchor, both ends of the fixing rod are connected to the inner wall of the first anchor, and the middle part of the suture is hung on the fixing rod.

[0022] Furthermore, a handle is provided at the tail end of the operating rod.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention improves the suture anchor and its assembly tool in current surgical operations, assembles three anchors on an operating rod to form a serial anchor structure, and the sutures run alternately in the operating rod. Only one wound is needed to implant the three anchors at one time in the preset position. The sutures running alternately in the operating rod and outside the anchor can be squeezed between the anchor and the tissue in a preset manner, and the three anchors are fixed in a triangle, effectively resetting and fixing small fracture fragments. The present invention allows the two ends of the suture starting from the first anchor to be squeezed between the other two anchors and the implanted bone interface respectively by the suture running alternately inside the operating rod and outside the anchor, so as to achieve knot-free fixation of the suture. In the field of fixing small fracture fragments, the present invention changes the split structure of the traditional anchor, suture anchor and implant device, and pre-assembles the anchor and suture in series on the same operating rod, which can not only reduce the number of wounds on the skin surface, but also greatly simplify the operation steps of using suture anchors for surgery.

[0025] Furthermore, the anchor limiting device of the present invention presses the straight rod to squeeze the spring to retract the first positioning pin, thereby allowing the anchor to fall. This structure is easy to use and operate, and the implantation of three anchors can be achieved without withdrawing the operating rod.

[0026] Furthermore, the present invention provides a pressing mechanism to facilitate control of the anchor limiting device, and a limiting plate and a pressing spring are provided in the pressing mechanism to limit excessive pressing and avoid damage to the anchor limiting device caused by excessive pressing.

[0027] Furthermore, the first spring sheet of the present invention includes a first section of spring sheet and a second section of spring sheet; one end of the first section of spring sheet is connected to the top of the spring sheet receiving opening, and the other end is connected to one end of the second section of spring sheet through an arc transition section, so that the front end of the anchor can be placed on the arc transition section, thereby stabilizing the anchor.

[0028] Furthermore, the present invention hangs the suture on the fixing rod, which can play a good role in fixing the suture and prevent the suture from falling off during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 4 is a cross-sectional view of a tandem knot-free suture anchor according to an embodiment of the present invention.

[0031] Figure 2 It is a front view of a tandem knot-free suture anchor in one embodiment of the present invention.

[0032] Figure 3 1 is a side view of a tandem knot-free suture anchor according to an embodiment of the present invention.

[0033] Figure 4 It is a stereoscopic diagram of a tandem knot-free suture anchor in one embodiment of the present invention.

[0034] Figure 5 1 is a top view of a tandem knot-free suture anchor according to an embodiment of the present invention.

[0035] Figure 6 It is a schematic diagram of an internal anchor limiting device of a tandem knot-free suture anchor in one embodiment of the present invention.

[0036] Figure 7 4 is a cross-sectional view of a tandem knot-free suture anchor in another embodiment of the present invention.

[0037] Figure 8 It is a front view of a tandem knot-free suture anchor in another embodiment of the present invention.

[0038] Fig. 9 1 is a side view of a tandem knot-free suture anchor according to another embodiment of the present invention.

[0039] Fig.10 It is a stereoscopic view of a tandem knot-free suture anchor in another embodiment of the present invention.

[0040] Fig.11 1 is a top view of a tandem knot-free suture anchor in another embodiment of the present invention.

[0041] In the figure: handle 1, operating rod 2, first anchor 3-1, second anchor 3-2, third anchor 3-3, first spring sheet 4-2, second spring sheet 4-1, first limit spring 4, suture 5, fixing rod 6, first platform 7, first slider 8, first straight rod 9, second straight rod 10, limit plate 11, pressing spring 12, pressing plate 13, first positioning pin 14, second slider 15, second platform 16, second limit spring 17, second positioning pin 18. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0043] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.

[0044] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0045] In addition, it should be noted that the terms "first", "second", etc. of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. The orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements.

[0046] like Figure 1-4 and Figure 7-10The serial knot-free suture anchor of the present invention comprises an operating rod 2 and a suture 5, wherein the operating rod 2 is provided with a first anchor 3-1, a second anchor 3-2 and a third anchor 3-3 in sequence from bottom to top; the operating rod 2 is a hollow tube structure with upper and lower openings, the front end of the first anchor extends out of the operating rod 2, and the middle part of the suture 5 is fixed inside the front end of the first anchor 3-1; the first end of the suture 5 passes through the operating rod 2 from a position between the first anchor and the second anchor. The suture 5 is inserted into the operating rod 2 from the position where the operating rod 2 is located between the second anchor 3-2 and the third anchor 3-3, and comes out from the top end of the operating rod 2; the second end of the suture 5 passes out of the operating rod 2 from the position where the operating rod 2 is located between the second anchor 3-2 and the third anchor 3-3, and enters the operating rod 2 from the position where the operating rod 2 is located above the third anchor 3-3; an anchor limiting device is provided inside the operating rod 2, and the anchor limiting device is used to lock the second anchor 3-2 and the third anchor 3-3.

[0047] In a specific embodiment of the present invention, a fixing rod 6 ( Figure 1 ), both ends of the fixing rod 6 are connected to the inner wall of the first anchor 3 - 1 , and the middle part of the suture 5 is hung on the fixing rod 6 , thereby playing a good role in fixing the suture 5 .

[0048] In a specific embodiment of the present invention, the anchor limiting device includes: a first anchor limiting device and a second anchor limiting device; the first anchor limiting device is used to lock the second anchor 3-2, and the second anchor limiting device is used to lock the third anchor 3-3.

[0049] like Figure 1 and Figure 6 As shown, the first anchor limit device includes a first straight rod 9 located in the operating rod 2, and two latches are connected to the lower end of the first straight rod 9. A first platform 7 is fixed in the operating rod 2, and a first slider 8 is slidably arranged on the first platform 7. A first limit spring 4 is arranged between the first side surface of the first slider 8 and the inner wall of the operating rod 2, and a first positioning pin 14 is connected to the second side surface of the first slider 8 opposite to the first side surface, and a pin hole matching the first positioning pin 14 is arranged at a corresponding position on the operating rod 2; sliding grooves corresponding to the two latches are arranged on the third and fourth side surfaces of the first slider 8, and the sliding grooves are arranged at an acute angle to the first side surface, and each latch is slidably inserted into a corresponding sliding groove; the first side surface is parallel to the second side surface, the third side surface is perpendicular to the first side surface, the fourth side surface is perpendicular to the first side surface, and the third side surface is parallel to the fourth side surface.

[0050] In one embodiment of the present invention, a connecting plate is connected to the lower end of the first straight rod 9, and the bottom of the connecting plate is connected to two latches via two vertical arms.

[0051] In one embodiment of the present invention, the first anchor limiting device further includes a pressing mechanism located at the rear end of the operating rod 2, and the upper end of the first straight rod 9 is connected to the pressing mechanism.

[0052] like Figure 1 and Figure 6 As shown, the pressing mechanism includes a limit plate 11, a pressing spring 12 and a pressing plate 13, the limit plate 11 is fixed on the inner wall of the operating rod 2, the pressing spring 12 is located between the limit plate 11 and the pressing plate 13, and one end of the first straight rod 9 passes through the limit plate 11 and the pressing spring 12 and is connected to the pressing plate 13. The function of the limit plate 11 and the pressing spring 12 is to limit excessive pressing to avoid damage to the anchor limit device caused by excessive pressing.

[0053] When the pressing mechanism is pressed down, the first straight rod 9 drives the pin to move downward, and the first slider 8 moves toward the direction of the first limit spring 4, thereby compressing the first limit spring 4. When the first positioning pin 14 retracts from the pin hole into the operating rod 2, the second anchor 3-2 can descend along the operating rod 2; when the pressing mechanism is released, under the action of the first limit spring 4, the first slider moves toward the direction of the first positioning pin 14, driving the first positioning pin 14 to extend out of the pin hole, limiting the second anchor 3-2, and the second anchor 3-2 cannot descend along the operating rod 2, thereby achieving the locking of the second anchor 3-2.

[0054] The structure of the second anchor limit device is the same as that of the first anchor limit device. The second anchor limit device includes a second straight rod 10 located in the operating rod 2, two latches are connected to the lower end of the second straight rod 10, a second platform 16 is fixed in the operating rod 2, a second slider 15 is slidably arranged on the second platform 16, a second limit spring 4 is arranged between the second side surface of the second slider 15 and the inner wall of the operating rod 2, a second positioning pin 14 is connected to the second side surface of the second slider 15 opposite to the second side surface, and a pin hole matching the second positioning pin 14 is arranged at a corresponding position on the operating rod 2; a slide groove corresponding to the two latches is arranged on the third side surface and the fourth side surface of the second slider 15, the slide groove is arranged at an acute angle with the second side surface, and each latch is slidably inserted into a corresponding slide groove; the second side surface is parallel to the second side surface, the third side surface is perpendicular to the second side surface, the fourth side surface is perpendicular to the second side surface, and the third side surface is parallel to the fourth side surface.

[0055] In one embodiment of the present invention, a handle 1 is provided at the tail end of the operating rod 2 to facilitate the pressing operation of the pressing mechanism.

[0056] like Figure 7-11As shown, in a specific embodiment of the present invention, the anchor limiting device includes: a first spring sheet and a second spring sheet, the first spring sheet is used to lock the second anchor 3-2, and the second spring sheet is used to lock the third anchor 3-3. A spring sheet receiving port is provided at a position of the operating rod 2 corresponding to the first spring sheet, one end of the first spring sheet is connected to the top of the spring sheet receiving port, and the other end of the first spring sheet extends out of the spring sheet receiving port. When the first spring sheet is compressed, the first spring sheet can be retracted into the spring sheet receiving port, thereby allowing the second anchor 3-2 to move toward the head end of the operating rod 2. In the initial state, the first spring sheet and the second spring sheet are open to support the anchor thereon. When the anchor needs to be lowered, the spring sheet is pressed to enter the spring sheet receiving port, and the anchor can be lowered.

[0057] like Figure 7-11 As shown, in a specific embodiment of the present invention, the first spring sheet includes a first section spring sheet 4-2 and a second section spring sheet 4-1; one end of the first section spring sheet 4-2 is connected to the top of the spring sheet receiving opening, and the other end is connected to one end of the second section spring sheet 4-1 through an arc transition section, and the first section spring sheet 4-2 and the second section spring sheet 4-1 have the same bending direction. In this embodiment, the front end of the second anchor 3-2 can be placed on the arc transition section to stabilize the second anchor 3-2.

[0058] In the present invention, two first spring sheets can be provided, and the two first spring sheets are arranged opposite to each other.

[0059] In the present invention, the structure of the second spring piece is the same as that of the first spring piece.

[0060] The types and sizes of sutures and anchors used in the device can also be replaced according to different surgical requirements, ensuring the applicability of the system.

[0061] The method for using the serial knot-free suture anchor of the present invention is as follows: first, the first anchor 3-1 is implanted at the target position, at which time, the two ends of the suture 5 fixed inside the front end of the first anchor 3-1 run in the operating rod, the first end of the suture 5 passes through the operating rod 2 at the front end of the second anchor 3-2, bypasses the outside of the second anchor 3-2, and passes through the operating rod at the front end of the third anchor 3-3 and runs in the operating rod; the second end of the suture 5 passes through the operating rod 2 at the front end of the third anchor 3-3, bypasses the outside of the third anchor 3-3, and passes through the operating rod at the rear end of the third anchor 3-3 and runs in the operating rod. The second anchor 3-2 is released by the anchor limit device, and the second anchor 3-2 can be lowered to the head end of the operating rod, and the second anchor 3-2 is implanted at the target position, at which time the first end of the suture 5 running outside the second anchor 3-2 is squeezed between the second anchor 3-2 and the bone tissue and fixed. The third anchor 3-3 is released by the anchor limiting device, and the third anchor 3-3 descends to the head end of the operating rod, and the third anchor 3-3 is implanted at the target position. At this time, the second end of the suture 5 running outside the third anchor 3-3 is squeezed between the third anchor 3-3 and the bone tissue and fixed, forming a triangular suture bridge fixing method with the first anchor 3-1 as the vertex of the triangle, the second anchor 3-2 and the third anchor 3-3 as the two corners, and the first end and the second end of the suture 5 as the two sides.

[0062] The three anchors of the present invention are assembled on an operating rod to form a serial anchor structure. The sutures are alternately run in the operating rod with a hollow tube structure. Only one incision is needed to implant the three anchors at one time in the preset positions. The sutures alternately run in the operating rod and outside the anchors can be squeezed between the anchors and the tissue in a preset manner, and a triangular fixation is formed for the three anchors, thereby effectively reducing and fixing small bone fragments.

Claims

1. A series of knot-free suture anchors, characterized in that: The invention comprises an operating rod (2) and a suture (5), wherein the operating rod (2) is provided with a first anchor (3-1), a second anchor (3-2) and a third anchor (3-3) in sequence from bottom to top; the operating rod (2) is a hollow tube structure with upper and lower openings, the front end of the first anchor protrudes out of the operating rod (2), and the middle part of the suture (5) is fixed inside the front end of the first anchor (3-1); the first end of the suture (5) passes through the operating rod (2) from a position between the first anchor and the second anchor, and is inserted into the operating rod (2) from a position between the second anchor ( The suture (5) is inserted into the operating rod (2) at a position between the second anchor (3-2) and the third anchor (3-3), and comes out from the top end of the operating rod (2); the second end of the suture (5) passes out of the operating rod (2) from a position where the operating rod (2) is located between the second anchor (3-2) and the third anchor (3-3), and enters the operating rod (2) from a position where the operating rod (2) is located above the third anchor (3-3); an anchor limit device is provided inside the operating rod (2), and the anchor limit device is used to control the locking and movement of the second anchor (3-2) and the third anchor (3-3).

2. The tandem knot-free suture anchor according to claim 1, characterized in that: The anchor limiting device comprises: a first anchor limiting device and a second anchor limiting device; the first anchor limiting device is used to control the locking and movement of the second anchor (3-2), and the second anchor limiting device is used to control the locking and movement of the third anchor (3-3); The first anchor limit device comprises a first straight rod (9) located in the operating rod (2), the lower end of the first straight rod (9) is connected to two latches, a first platform (7) is fixed in the operating rod (2), a first slider (8) is slidably arranged on the first platform (7), a first limit spring (4) is arranged between the first side surface of the first slider (8) and the inner wall of the operating rod (2), a first positioning pin (14) is connected to the second side surface of the first slider (8) opposite to the first side surface, and a pin hole matching the first positioning pin (14) is arranged at a corresponding position on the operating rod (2); a sliding groove corresponding to the two latches is arranged on the third side surface and the fourth side surface of the first slider (8), the sliding groove is arranged at an acute angle with the first side surface, and each latch is slidably inserted into a corresponding sliding groove; the third side surface and the fourth side surface are perpendicular to the first side surface; the structure of the second anchor limit device is the same as that of the first anchor limit device.

3. The tandem knot-free suture anchor according to claim 2, characterized in that: The lower end of the first straight rod (9) is connected to a connecting plate, and the bottom of the connecting plate is connected to two latches via two vertical arms.

4. The tandem knot-free suture anchor according to claim 2, characterized in that: The first anchor limiting device comprises a pressing mechanism located at the rear end of the operating rod (2), and the upper end of the first straight rod (9) is connected to the pressing mechanism.

5. The tandem knot-free suture anchor according to claim 4, characterized in that: The pressing mechanism comprises a limit plate (11), a pressing spring (12) and a pressing plate (13); the limit plate (11) is fixed on the inner wall of the operating rod (2); the pressing spring (12) is located between the limit plate (11) and the pressing plate (13); one end of the first straight rod (9) passes through the limit plate (11) and the pressing spring (12) and is connected to the pressing plate (13).

6. The tandem knot-free suture anchor according to claim 1, characterized in that: The anchor limiting device comprises: a first spring sheet and a second spring sheet, the first spring sheet is used to control the locking and movement of the second anchor (3-2), and the second spring sheet is used to control the locking and movement of the third anchor (3-3); A spring sheet receiving opening is provided at a position of the operating rod (2) corresponding to the first spring sheet, one end of the first spring sheet is connected to the top of the spring sheet receiving opening, and the other end of the first spring sheet extends out of the spring sheet receiving opening; the structure of the second spring sheet is the same as that of the first spring sheet.

7. The tandem knot-free suture anchor according to claim 6, characterized in that: The first spring sheet includes a first section of spring sheet and a second section of spring sheet; one end of the first section of spring sheet is connected to the top of the spring sheet receiving opening, and the other end is connected to one end of the second section of spring sheet through an arc transition section, and the bending directions of the first section of spring sheet and the second section of spring sheet are the same.

8. The tandem knot-free suture anchor according to claim 6, characterized in that: Two first spring sheets are provided, and the two first spring sheets are arranged opposite to each other.

9. The tandem knot-free suture anchor according to claim 1, characterized in that: A fixing rod (6) perpendicular to the axis of the first anchor (3-1) is arranged inside the front end of the first anchor (3-1), both ends of the fixing rod (6) are connected to the inner wall of the first anchor (3-1), and the middle part of the suture (5) is hung on the fixing rod (6).

10. The tandem knot-free suture anchor according to claim 1, characterized in that: A handle (1) is provided at the rear end of the operating rod (2).

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