A femoral tendon fixation anchor

Abstract

The present application relates to the technical field of medical devices, and provides a femoral tendon fixation anchor, which includes an anchor inner core and an anchor outer sheath. The anchor inner core includes a connecting core rod and a driving core head that are connected to each other. An operation hole is formed in the connecting core rod, and the cross-section of the driving core head gradually increases in a direction away from the connecting core rod; the anchor outer sheath includes an anchoring sheath section and an expandable sheath head fixed to one end of the anchoring sheath section. The expandable sheath head includes a plurality of elastic fixing anchors arranged circumferentially along the end of the anchoring sheath section; after one end of the driving core head passes through the expandable sheath head, it is threadedly connected inside the anchoring sheath section; two tendon perforations are formed in the anchoring sheath section, and the two tendon perforations are arranged oppositely; tendon guiding grooves are arranged on both sides of the anchoring sheath section, and the tendon guiding grooves correspond to the tendon perforations one by one. The present application can weaken the damage caused to the femur during the operation and reduce the damage to the tendon by the suture.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a femoral tendon fixation anchor. Background Art

[0002] Total internal cruciate tendon reconstruction is a minimally invasive surgical procedure specifically for anterior cruciate tendon injuries of the knee. In this procedure, in order to achieve stable fixation of the new tendon structure, bone tunnels are usually created on the femur and tibia, and the grafted tissue is placed in place through these bone tunnels.

[0003] In traditional fixation methods, titanium plates are often used to fix the femoral tendon. Although this method can provide initial stability, it requires the establishment of a penetrating bone tunnel on the femur to accommodate the titanium plate and ensure its firmness. This operation causes great damage to the bone structure because the establishment of the femoral tunnel must penetrate the entire femur, which not only affects the integrity of the bone, but may also cause postoperative pain and prolong recovery time.

[0004] In addition to the problem of bone tunnel destruction, there are other potential risks when using titanium plates for fixation. During the fixation process, the tendon needs to be folded and connected to the titanium plate with sutures. The sutures pass directly through the tendon. When the patient starts to move or exercise, the tendon will be stretched, resulting in tension. Because the sutures are relatively thin, they will generate higher pressure when they are under force. This high pressure may cause damage to the tendon tissue, especially at the contact point between the tendon and the sutures. Long-term traction may cause damage to the tendon surface or even cuts. Such damage will not only affect the healing quality of the tendon, but may also reduce the long-term stability of the new tendon and increase the risk of re-injury. Summary of the invention

[0005] In order to reduce the damage to the femur caused by surgery and reduce the damage to the tendon caused by sutures, the present application provides a femoral tendon fixation anchor.

[0006] The present application provides a femoral tendon fixation anchor, which adopts the following technical solution:

[0007] A femoral tendon fixation anchor, comprising:

[0008] The anchor core comprises a connecting core rod and a driving core head connected to each other, wherein the connecting core rod is provided with an operation hole, and the cross section of the driving core head gradually increases in a direction away from the connecting core rod;

[0009] The outer sheath of the anchor screw includes an anchoring sheath section and an expandable sheath head fixed to one end of the anchoring sheath section. The expandable sheath head includes a plurality of elastic fixing anchors circumferentially arranged at the end of the anchoring sheath section. After one end of the driving core head passes through the expandable sheath head, it is threadedly connected inside the anchoring sheath section. Two tendon perforations are provided on the anchoring sheath section, and the two tendon perforations are arranged oppositely. Tendon guiding grooves are provided on both sides of the anchoring sheath section, and the tendon guiding grooves correspond to the tendon perforations one by one.

[0010] By adopting the above technical solution, the threaded connection between the inner core and the outer sheath of the anchor screw enables the inner core to push the fixing anchor outwards to expand, so that the inner core and the outer sheath of the anchor screw can be firmly fixed in the femoral canal. The damage to the femur is reduced, and only a bone canal with a certain depth needs to be drilled to complete the fixation. At the same time, the tendon perforations at the bottom of the outer sheath of the anchor screw are used to place tendons, providing a large tendon contact area for the installation of tendons on the outer sheath of the anchor screw, effectively reducing the pressure when stressed, and avoiding tendon damage caused by high pressure. In addition, the tendon guiding grooves on both sides ensure the uniform distribution of tendons and promote the good healing of tendons and bones.

[0011] Optionally, the anchoring sheath section includes a connecting cylinder and two sheath plates fixed to one end of the connecting cylinder. The two sheath plates are arranged oppositely, and the tendon perforations are provided on the sheath plates;

[0012] One end of the driving core head is threadedly connected inside the connecting cylinder, and the tendon guiding grooves are provided on the side walls of the sheath plates.

[0013] By adopting the above technical solution, the design of the anchoring sheath section includes a connecting cylinder and two oppositely arranged sheath plates, which increases the overall stability, and also ensures the reasonable distribution of the positions of the tendon perforations, improving the fixing effect. One end of the driving core head is threadedly connected inside the connecting cylinder, ensuring that when the inserter is rotated, the inner core can move stably towards the tendon direction, squeezing the elastic fixing anchor, so that the expandable sheath head expands. The tendon guiding grooves are provided on the side walls of the sheath plates, enabling the tendon to enter the inside of the anchor screw along a predetermined path, avoiding problems such as fixation failure or damage caused by improper tendon position, and at the same time promoting the good contact between the tendon and the femoral canal and accelerating the healing process.

[0014] Optionally, the elastic fixing anchor includes an elastic rib plate and an anchor tip fixed to one side of the elastic rib plate. The anchor tip is located at one end of the elastic rib plate away from the anchoring sheath section, and the cross-section of the anchor tip gradually shrinks in the direction away from the elastic rib plate.

[0015] By adopting the above technical solutions, the combination of the elastic rib plate and the anchor tip enables the fixing anchor to expand and bulge outwards after being inserted into the bone tunnel, so as to closely fit the bone tunnel and ensure the fixing stability. In addition, the design of the gradually shrinking cross-section of the anchor tip makes it easier to cut into the bone surface, further improving the reliability and firmness of the expandable sheath head in the bone tunnel fixation.

[0016] Optionally, the elastic fixing anchor further includes a reinforcing rib, the reinforcing rib extends along the side wall of the anchor tip to the elastic rib plate, and the cross-section of the reinforcing rib is triangular.

[0017] By adopting the above technical solutions, the design of the reinforcing rib can significantly enhance the anti-deformation ability of the elastic fixing anchor, ensuring that it will not easily deform or be damaged even under a large external force during the fixing process. In addition, the triangular cross-section of the reinforcing rib further improves the overall strength and stability of the elastic fixing anchor, making the fixation more firm and reliable.

[0018] Optionally, the side wall at the connection between the elastic fixing anchor and the connecting cylinder is set as a smooth curved surface, and the edge of the tendon perforation is set as an arc transition surface.

[0019] By adopting the above technical solutions, the setting of the smooth curved surface can effectively avoid the stress concentration phenomenon at the connection between the elastic fixing anchor and the connecting cylinder, thereby improving the anti-fatigue performance and service life of this part. At the same time, the design of the smooth curved surface enables the fixing anchor to expand outwards more smoothly during the expansion process, reducing the risk of excessive local stress caused by sudden shape changes, and ensuring the safety and reliability of the fixing process. The arc transition surface at the edge of the tendon perforation can effectively reduce the risk of cutting the tendon by the edge of the tendon perforation, ensuring that the tendon will not be damaged by the sharp edge during the fixing process.

[0020] Optionally, the sheath plate is made of an elastic material, and the distance between the two sheath plates gradually increases in the direction away from the connecting cylinder.

[0021] By adopting the above technical solutions, the sheath plate made of an elastic material can produce certain deformation during the installation process to ensure close contact between the tendon, the sheath plate and the inner wall of the bone tunnel, thereby enhancing the fixing stability. The distance between the two sheath plates gradually increases in the direction away from the connecting cylinder, which helps to guide the tendon into the inside of the anchor during the implantation process. In addition, after the anchoring sheath section is placed into the bone tunnel together with the tendon, the inner wall of the bone tunnel will squeeze the two sheath plates, so that the two sheath plates can squeeze the tendon against the bone tunnel, promoting the healing of the tendon and the bone.

[0022] Optionally, before the connecting core rod is threadedly connected to the connecting cylinder, the outer diameter of the expandable sheath head is 0.8 - 1 mm smaller than the outer diameter of the connecting cylinder.

[0023] By adopting the above technical solution, during the fixation of the femoral tendon, the expandable sheath head can be expanded outward by the extrusion of the inner core after entering the bone tunnel, so as to closely fit the inside of the bone tunnel, ensuring the fixation effect while reducing the damage to the bone mass. Before the connecting core rod is threadedly connected to the connecting cylinder, the expandable sheath head is in a non-expanded state. At this time, the outer diameter of the expandable sheath head is 0.8 - 1 mm smaller than the outer diameter of the connecting cylinder, and a bone tunnel with a smaller diameter can be established before the operation, reducing the damage to the femur and being beneficial to postoperative recovery.

[0024] Optionally, the length of the expandable sheath head accounts for 1 / 3 - 2 / 5 of the total length of the outer sheath of the anchor.

[0025] By adopting the above technical solution, the length of the expandable sheath head accounts for 1 / 3 - 2 / 5 of the total length of the outer sheath of the anchor. While meeting the fixation strength, the overall size of the anchor is minimized to further reduce the damage to the bone during the operation.

[0026] Optionally, the length of the connecting cylinder accounts for 1 / 5 - 1 / 3 of the total length of the outer sheath of the anchor.

[0027] By adopting the above technical solution, the length of the connecting cylinder is reasonably designed, which can ensure the effective threaded connection between the inner core and the outer sheath of the anchor, and at the same time maintain sufficient mechanical strength. On the premise of meeting the expansion distance of the fixed anchor, the overall length of the anchor is reduced, thereby reducing the damage to the femur, lowering the surgical risk and postoperative recovery time.

[0028] Optionally, the length of the sheath plate accounts for 1 / 2 - 3 / 5 of the total length of the outer sheath of the anchor.

[0029] By adopting the above technical solution, the length of the sheath plate accounts for 1 / 2 - 3 / 5 of the total length of the outer sheath of the anchor, which can ensure that the tendon guiding groove has sufficient length, so that the tendon is evenly distributed on both sides of the anchor, fully contacts the femoral canal, and promotes the healing of the tendon and the bone. At the same time, the longer sheath plate can also provide sufficient supporting force to prevent the tendon from slipping out from the bottom when stressed, increasing the stability of the fixation.

[0030] In summary, the present application includes at least one of the following beneficial effects:

[0031] 1. The present application includes an inner core of the anchor and an outer sheath of the anchor, and the two are connected by threads. By extruding the expandable sheath head at the upper end of the outer sheath with the inner core of the anchor, the fixation function of the tendon and the outer sheath of the anchor in the bone tunnel is realized; during use, only a bone tunnel with a certain depth needs to be drilled in the femur to complete the fixation, without penetrating the femur, significantly reducing the damage to the femur;

[0032] 2. In this application, the elastic fixing anchor includes an elastic rib plate and an anchor tip. The cross-section of the anchor tip gradually narrows towards the direction away from the elastic rib plate to form a tip, which can easily cut into the inner bone surface of the bone tunnel for better fixation.

[0033] 3. A tendon perforation is provided on the anchoring sheath section of the outer sheath of the anchor screw for the tendon to penetrate, connect, and fix the tendon. The edge of the tendon perforation is rounded to prevent cutting the tendon, greatly reducing the damage to the tendon during the operation. Brief Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the overall structure of the femoral tendon fixing anchor screw in Embodiment 1 of this application;

[0035] Figure 2 It is an exploded structure schematic diagram of the femoral tendon fixing anchor screw in Embodiment 1 of this application;

[0036] Figure 3 It is a schematic diagram of the side view structure of the femoral tendon fixing anchor screw in Embodiment 1 of this application;

[0037] Figure 4 It is an exploded structure schematic diagram of the femoral tendon fixing anchor screw in Embodiment 2 of this application;

[0038] Figure 5 It is a schematic diagram of the overall structure of the femoral tendon fixing anchor screw in Embodiment 3 of this application;

[0039] Description of the reference numerals: 1. Inner core of the anchor screw; 11. Connecting core rod; 111. Operation hole; 12. Driving core head; 2. Outer sheath of the anchor screw; 21. Anchoring sheath section; 211. Connecting cylinder; 212. Sheath plate; 2121. Tendon perforation; 2122. Tendon guiding groove; 2123. Accommodating groove; 213. Belt through cylinder; 22. Elastic fixing anchor; 221. Elastic rib plate; 222. Anchor tip; 223. Reinforcing rib. Detailed Description of the Embodiments

[0040] The following further elaborates on this application in conjunction with the attached Figures 1-5 for a more detailed description.

[0041] Embodiment 1

[0042] Embodiment 1 of this application provides a femoral tendon fixing anchor screw.

[0043] Refer to Figure 1 and Figure 2, the femoral tendon fixation anchor includes an anchor inner core 1 and an anchor outer sheath 2. Among them, the anchor inner core 1 includes an integrally formed connecting core rod 11 and a driving core head 12. An operation hole 111 is provided on the connecting core rod 11, and the operation hole 111 is set as a polygonal hole, which is convenient for using tools to drive the connecting core rod 11 to move during the operation. In this embodiment, the operation hole 111 is specifically set as a hexagonal hole, and one end of the operation hole 111 extends into the driving core head 12. The cross-section of the driving core head 12 gradually increases in the direction away from the connecting core rod 11. In this embodiment, the driving core head 12 is specifically set as a frustum of a cone; the surface of the driving core head 12 is smooth, reducing the friction with the surrounding tissues during use.

[0044] Refer to Figure 2 and Figure 3 , the anchor outer sheath 2 is set as a cylindrical shape, and the anchor outer sheath 2 includes an anchoring sheath section 21 and an expandable sheath head fixed to one end of the anchoring sheath section 21. The anchoring sheath section 21 includes an integrally formed connecting cylinder 211 and a tendon-passing cylinder 213. Two tendon perforations 2121 are provided on the tendon-passing cylinder 213, and the two tendon perforations 2121 are arranged oppositely. Two tendon guiding grooves 2122 are also provided on the outer side wall of the tendon-passing cylinder 213. The tendon guiding grooves 2122 are arranged in one-to-one correspondence with the tendon perforations 2121. The setting of the tendon guiding grooves 2122 makes the tendons evenly distributed on both sides of the anchor, fully contacting the bone tunnel, and promoting the healing of the tendon and the bone. The edges of the tendon perforations 2121 are chamfered to form an arc transition surface to prevent the tendon from being cut during the installation process.

[0045] Refer to Figure 2, the expandable sheath head includes a plurality of elastic fixing anchors 22. One end of the connecting cylinder 211 away from the tape passing cylinder 213 tapers away from the tape passing cylinder 213, forming a frustum-shaped structure. The plurality of elastic fixing anchors 22 are arranged at intervals in the circumferential direction and are fixed on the end of the connecting cylinder 211. In this embodiment, specifically four elastic fixing anchors 22 are provided. The elastic fixing anchor 22 includes an elastic rib plate 221, an anchor tip 222 and a reinforcing rib 223. The elastic rib plate 221 is fixed on the connecting cylinder 211, and the side wall at the connection between the elastic rib plate 221 and the connecting cylinder 211 is processed into a smooth curved surface. The wall thickness of the elastic rib plate 221 is relatively thin, so that it can be deformed and expanded under a relatively small extrusion force. The anchor tip 222 is located at one end of the elastic rib plate 221 away from the connecting cylinder 211 and is fixedly connected to the side wall of the elastic rib plate 221. The cross-section of the anchor tip 222 gradually decreases in the direction away from the elastic rib plate 221, and the cross-section angle of the anchor tip 222 is 60°. Through the design of the anchor tip 222, the elastic fixing anchor 22 can be easily cut into the inner wall of the bone tunnel during use for better fixation. The reinforcing rib 223 extends along the side wall of the anchor tip 222 to the elastic rib plate 221, and the reinforcing rib 223 is fixedly connected to both the anchor tip 222 and the elastic rib plate 221. The cross-section of the reinforcing rib 223 also tapers in the direction away from the elastic rib plate 221, forming a cone shape. The cross-section of the reinforcing rib 223 is triangular, having better resistance to deformation and improving the strength of the fixing anchor. The width of the reinforcing rib 223 is smaller than that of the elastic rib plate 221, and the length is about half of that of the elastic rib plate 221. Before the connecting core rod 11 is threadedly connected to the connecting cylinder 211, the expandable sheath head is in a non-expanded state. At this time, the maximum outer diameter of the expandable sheath head is 0.8 - 1 mm smaller than the outer diameter of the connecting cylinder 211. In this embodiment, specifically it is 0.8 mm smaller. During use, the bone tunnel in the front-end area can be set to a smaller diameter to reduce the damage to the femur and be beneficial to postoperative recovery.

[0046] In other embodiments, the reinforcing rib 223 can also be set as a mesh structure to provide better anti-deformation ability and can also disperse stress during the fixing process.

[0047] Referring to Figure 1 , after one end of the driving core head 12 passes through the expandable sheath head, it is threadedly connected inside the connecting cylinder 211; it can minimize the damage to the femur and effectively avoid the damage of the suture to the tendon. The frustum-shaped setting of the driving core head 12 enables the driving core head 12 to better push each elastic fixing anchor 22 to expand outwards when the connecting core rod 11 rotates the connecting cylinder 211, so that the anchor tip 222 is firmly embedded in the bone tunnel.

[0048] The implementation principle of the femoral tendon fixation anchor in Embodiment 1 is as follows: Drill a bone tunnel with a certain depth in the femur. During the operation, fold the tendon formed by folding the gracilis and semitendinosus muscles in half and pass it through the two tendon perforations 2121 in sequence. After the tendon passes through the tendon perforations 2121, use a suture to sew the end of the tendon passing through the tendon perforations 2121 to the other end of the tendon. Then, use a tool to pass through the gap between the gracilis and semitendinosus muscles and insert it into the operation hole 111. The operating tool places the anchor core 1 with the tendon and the anchor sheath 2 into the bone tunnel. After the anchor core 1 and the anchor sheath 2 reach the designated position in the bone tunnel by tapping, rotate the tool to drive the anchor core 1 to move towards the tendon direction to squeeze each elastic fixation anchor 22, so that the expandable sheath head expands, and the elastic fixation anchor 22 opens to squeeze the bone tunnel to achieve fixation in the bone tunnel. The tendon is partially located in the tendon guiding grooves 2122 on both sides of the belt through-tube 213 and is fixedly contacted in the bone tunnel by the extrusion between the belt through-tube 213, the tendon and the inner wall of the bone tunnel. Finally, remove the tool. Compared with the traditional titanium plate fixation method, the anchor structure of the present invention is more compact, the installation is simpler, and the fixation effect is more reliable.

[0049] Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is as follows:

[0051] Refer to Figure 4 In this embodiment, the belt through-tube 213 is replaced by two oppositely arranged sheath plates 212. The tendon perforations 2121 and the tendon guiding grooves 2122 are also opened on the sheath plates 212, and the tendon perforations 2121 and the tendon guiding grooves 2122 are arranged in one-to-one correspondence with the sheath plates 212. The sheath plates 212 are made of elastic materials, and the distance between the inner walls of the two sheath plates 212 gradually increases in the direction away from the connecting tube 211. In this embodiment, at the end of the two sheath plates 212 away from the connecting tube 211, the distance between the outer walls of the two sheath plates 212 is smaller than the outer diameter of the connecting tube 211. The gradually increasing distance between the two sheath plates 212 helps to guide the tendon into the inner part of the bone tunnel during the implantation process. In addition, after the anchoring sheath section 21 is placed into the bone tunnel together with the tendon, the inner wall of the bone tunnel will squeeze the two sheath plates 212, so that the two sheath plates 212 can squeeze the tendon against the bone tunnel, promoting the healing of the tendon and the bone.

[0052] Among them, the length of the inflatable sheath head accounts for 1 / 3 - 2 / 5 of the total length of the outer sheath 2 of the anchor bolt, which can enable the elastic fixing anchor 22 to expand to a sufficient size for fixation while meeting the minimum nail size. The length of the connecting cylinder 211 accounts for 1 / 5 - 1 / 3 of the total length of the outer sheath 2 of the anchor bolt, ensuring a tight connection between the inner core 1 of the anchor bolt and the outer sheath 2 of the anchor bolt. The length of the sheath plate 212 accounts for 1 / 2 - 3 / 5 of the total length of the outer sheath 2 of the anchor bolt, ensuring the stability of the tendon and the fixation effect. In this embodiment, the length of the inflatable sheath head specifically accounts for 1 / 3 of the total length of the outer sheath 2 of the anchor bolt, the length of the connecting cylinder 211 accounts for 1 / 6 of the total length of the outer sheath 2 of the anchor bolt, and the length of the sheath plate 212 accounts for 1 / 2 of the total length of the outer sheath 2 of the anchor bolt.

[0053] Embodiment 3

[0054] The difference between this embodiment and Embodiment 2 is as follows:

[0055] Referring to Figure 5 , in this embodiment, at one end of the two sheath plates 212 away from the connecting cylinder 211, the distance between the outer side walls of the two sheath plates 212 is greater than the outer diameter of the connecting cylinder 211. And a receiving groove 2123 is also formed at one end of the sheath plate 212 away from the connecting cylinder 211. During use, the part of the tendon sheath near the bottom end of the sheath plate 212 is located in the receiving groove 2123. After placing the inner core 1 of the anchor bolt and the outer sheath 2 of the anchor bolt into the bone tunnel, the outer sheath 2 of the anchor bolt is completely moved into the bone tunnel by knocking. Since the distance between the outer side walls at the bottom ends of the two sheath plates 212 is slightly greater than the size of the bone tunnel, the bottom ends of the two sheath plates 212 are in a contracted state under the extrusion of the bone tunnel; the bottom ends of the sheath plates 212 are pressed against the inner side wall of the bone tunnel, further improving the fixing stability of the outer sheath 2 of the anchor bolt in the bone tunnel and making it difficult for the tendon to break away from the bone tunnel. The edge of the receiving groove 2123 is also processed into a smooth curved surface, so that when the patient starts to move or exercise and the tendon is stretched, the tendon is not easily cut.

[0056] The above are all preferred embodiments of this application. Without restricting the protection scope of this application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A femoral tendon fixation anchor, characterized in that: include The anchor inner core (1) comprises a connecting core rod (11) and a driving core head (12) which are connected to each other, wherein the connecting core rod (11) is provided with an operation hole (111), and the cross section of the driving core head (12) gradually increases in a direction away from the connecting core rod (11); The anchor sheath (2) comprises an anchor sheath segment (21) and an expandable sheath head fixed to one end of the anchor sheath segment (21), wherein the expandable sheath head comprises a plurality of elastic fixing anchors (22) arranged circumferentially at the end of the anchor sheath segment (21); one end of the driving core head (12) passes through the expandable sheath head and is threadedly connected to the anchor sheath segment (21); the anchor sheath segment (21) is provided with two tendon perforations (2121), and the two tendon perforations (2121) are provided with a plurality of elastic fixing anchors (22) arranged circumferentially at the end of the anchor sheath segment (21); 121); tendon guide grooves (2122) are arranged on both sides of the anchoring sheath section (21), and the tendon guide grooves (2122) correspond to the tendon perforations (2121) one by one; the anchoring sheath section (21) comprises a connecting tube (211) and two sheath plates (212) fixed at one end of the connecting tube (211), the two sheath plates (212) are arranged opposite to each other, and the tendon perforations (2121) are opened on the sheath plates (212); One end of the driving core head (12) is threadedly connected to the connecting tube (211), and the tendon guide groove (2122) is arranged on the side wall of the sheath plate (212); The sheath plates (212) are made of elastic material, and the distance between the two sheath plates (212) gradually increases in a direction away from the connecting tube (211).

2. A femoral tendon fixation anchor according to claim 1, characterized in that: The elastic fixing anchor (22) comprises an elastic rib (221) and an anchor tip (222) fixed to one side of the elastic rib (221); the anchor tip (222) is located at an end of the elastic rib (221) away from the anchoring sheath section (21); and a cross section of the anchor tip (222) gradually decreases in a direction away from the elastic rib (221).

3. A femoral tendon fixation anchor according to claim 2, characterized in that: The elastic fixing anchor (22) further comprises a reinforcing rib (223), wherein the reinforcing rib (223) extends along the side wall of the anchor tip (222) to the elastic rib plate (221), and the cross section of the reinforcing rib (223) is triangular.

4. A femoral tendon fixation anchor according to claim 1, characterized in that: The side wall of the connection between the elastic fixing anchor (22) and the connecting tube (211) is configured as a smooth curved surface, and the edge of the tendon perforation (2121) is configured as an arc transition surface.

5. The femoral tendon fixation anchor according to claim 1, characterized in that: Before the connecting core rod (11) is threadedly connected to the connecting tube (211), the outer diameter of the expandable sheath head is 0.8-1 mm smaller than the outer diameter of the connecting tube (211).

6. A femoral tendon fixation anchor according to claim 1, characterized in that: The length of the expandable sheath head accounts for 1 / 3 to 2 / 5 of the total length of the anchor outer sheath (2).

7. A femoral tendon fixation anchor according to claim 1, characterized in that: The length of the connecting tube (211) accounts for 1 / 5 to 1 / 3 of the total length of the anchor outer sheath (2).

8. The femoral tendon fixation anchor according to claim 1, characterized in that: The length of the sheath plate (212) accounts for 1 / 2 to 3 / 5 of the total length of the anchor outer sheath (2).

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