Adjustable anterior cruciate ligament protection drag hook for knee joint unicompartmental knee arthroplasty

Abstract

The invention relates to the technical field of medical instruments, and discloses an adjustable anterior cruciate ligament protection drag hook for knee joint unicompartmental knee arthroplasty, which comprises a cross rod, a connecting rod is movably arranged on the upper surface of the cross rod, a protection head is fixedly connected to one end, far away from the cross rod, of the connecting rod, and a fixing bolt is movably inserted into the lower surface of the cross rod. Free 360-degree rotation is achieved through the connection characteristic of the ball head between the transverse rod and the connecting rod, the large-range rotation facilitates flexible adjustment of the positions of the connecting rod and the protection head according to the anatomical structure of the knee joint of a patient, the protection head accurately corresponds to the anterior cruciate ligament, and the protection head of a semicircular cylinder structure slowly extends between the femoral bone and the tibia. And the inclination angle of the anterior cruciate ligament is matched with the actual shape of the ligament, so that the protection fitting degree and effect are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an adjustable anterior cruciate ligament protection retractor for unicondylar replacement of the knee joint. Background Art

[0002] Unicompartmental knee arthroplasty is a minimally invasive surgery for unicompartmental knee lesions. It only replaces the worn articular surface on the inner or outer side of the knee joint, retaining healthy cartilage, ligaments and other structures. It has the advantages of small incision, less bleeding and fast recovery. It can effectively relieve pain and restore joint function. It is suitable for patients with unicompartmental osteoarthritis and is a treatment option that retains more of the body's own joint structure.

[0003] During unicompartmental knee arthroplasty, protection of the anterior cruciate ligament (ACL) is crucial. Currently, conventional retractors and related devices have significant drawbacks: First, most retractors are fixed in structure, unable to adapt to individual patient anatomy and the actual intraoperative requirements. During surgery, the non-adjustable angle makes it difficult for the retractor to precisely fit the ligament, which can cause compression and friction, increasing the risk of ligament injury. Second, the fixed position of the retractor obscures the critical surgical field of view and limits the operating space for surgical instruments, increasing surgical difficulty, prolonging the operation, and compromising efficiency and precision. Furthermore, some retractors with adjustable functions have complex adjustment mechanisms, making intraoperative manipulation time-consuming and labor-intensive. Furthermore, the adjusted retractors lack structural stability, making them prone to displacement during surgery and failing to provide long-term and reliable protection for the ACL. These technical bottlenecks not only affect surgical success rates but can also lead to increased postoperative complications, severely hampering the clinical effectiveness and patient outcomes of unicompartmental knee arthroplasty. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that during unicompartmental knee replacement surgery, traditional anterior cruciate ligament protection retractors are fixed with multiple structures, and the angle and position are difficult to adjust, which can easily cause ligament damage, block the field of vision, and affect the operation. Some adjustable retractors are complex and unstable to adjust, which restricts the surgical effect. For this reason, we propose an adjustable anterior cruciate ligament protection retractor for unicompartmental knee replacement.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: an adjustable anterior cruciate ligament protection hook for unicompartmental knee replacement, comprising a cross bar, a connecting rod movably provided on the upper surface of the cross bar, a protective head fixedly connected to the end of the connecting rod away from the cross bar, and a fixing bolt movably inserted into the lower surface of the cross bar.

[0006] Preferably, an extension rod is fixedly connected to the side of the cross bar, and an end of the extension rod away from the cross bar is fixedly connected to a handle.

[0007] Preferably, a groove is provided on the upper surface of the crossbar, and the groove is in the shape of a sphere with an upper opening.

[0008] Preferably, the spherical head is movably engaged inside the groove.

[0009] Preferably, the protective head is configured as a semi-cylindrical structure.

[0010] Preferably, the protective head and the connecting rod are arranged at an angle, and the angle of ... anterior cruciate ligament is the same as the angle of the angle of the anterior cruciate ligament.

[0011] Preferably, a threaded channel is provided on the lower surface of the crossbar, and the top end of the threaded channel is connected to the groove.

[0012] Preferably, the fixing bolt is threadedly connected to the inside of the threaded channel.

[0013] Preferably, hexagonal notches are provided at both upper and lower ends of the fixing bolt.

[0014] Preferably, the bottom end of the fixing bolt extends out of the lower surface of the cross bar, and the top end of the fixing bolt abuts against the outer surface of the spherical head.

[0015] The technical effects and advantages of the present invention are as follows: The present invention utilizes the spherical head connection between the crossbar and the connecting rod to achieve 360-degree free rotation. This wide range of rotation allows for flexible adjustment of the connecting rod and the protective head according to the patient's knee anatomy, ensuring the head precisely aligns with the anterior cruciate ligament. The semi-cylindrical protective head slowly extends between the femur and tibia, wrapping around the anterior cruciate ligament. Its tilt angle matches the actual shape of the ligament, significantly improving the fit and effectiveness of the protection. In the present invention, a tool is used to tighten the fixing bolt so that it slides along the threaded channel toward the inside of the cross bar. The top of the fixing bolt slides into the bottom of the groove and fits with the spherical head. The hexagonal notch design at the top of the threaded channel enhances the stability of the connection between the fixing bolt and the spherical head, thereby achieving a firm locking of the spherical head, thereby stabilizing the connecting rod and the protective head, and ensuring that the protective head continues to protect the anterior cruciate ligament until the end of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components: Figure 1 This is a schematic diagram of the overall structure of the present invention from a first viewing angle; Figure 2 This is a schematic structural diagram of the overall structure of the present invention from a second viewing angle; Figure 3 This is a structural schematic diagram of the cross bar and the connecting rod in the connection state of the present invention; Figure 4 This is a structural schematic diagram of the cross bar and the connecting rod of the present invention in a disassembled state; Figure 5 Schematic diagram of the internal structure of the crossbar of the present invention; Figure 6 It is a schematic diagram of the fixing bolt structure of the present invention.

[0017] Legend: 1. Crossbar; 2. Connecting rod; 3. Protective head; 4. Extension rod; 5. Handle; 6. Ball head; 7. Groove; 8. Fixing bolt; 9. Threaded channel; 10. Hexagonal notch. DETAILED DESCRIPTION

[0018] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0019] Reference Figures 1 to 4 As shown, the present invention provides a technical solution: an adjustable anterior cruciate ligament protection hook for unicompartmental knee replacement, comprising a cross bar 1, a connecting rod 2 movably provided on the upper surface of the cross bar 1, the length of the cross bar 1 is five centimeters, and the overall height of the cross bar 1 and the connecting rod 2 is also five centimeters, and a protective head 3 is fixedly connected to the end of the connecting rod 2 away from the cross bar 1, the length of the protective head 3 is two centimeters and the width is one centimeter, which meets the limited operating space of the operation, a groove 7 is provided on the upper surface of the cross bar 1, and the groove 7 is a spherical shape with an upper opening, and the spherical head 6 is movably clamped in the inside of the groove 7, the protective head 3 is arranged to be a semi-cylindrical structure, and the protective head 3 is inclined to the connecting rod 2, and the inclination angle is the same as the inclination angle of the anterior cruciate ligament.

[0020] Since the cross bar 1 and the connecting rod 2 are connected by the spherical head 6, the characteristics of the spherical head 6 can achieve 360-degree free rotation. The large range of rotation makes it easy to adjust the position of the connecting rod 2 and the protective head 3, so that the protective head 3 corresponds to the position of the anterior cruciate ligament. The protective head 3 is slowly extended between the femur and the tibia, so that the protective head is placed outside the anterior cruciate ligament. The unique semi-cylindrical structure of the protective head 3 can be used to wrap the anterior cruciate ligament inside for protection, and the inclination angle set by the protective head is completely consistent with the actual inclination angle of the anterior cruciate ligament, which can improve the fit effect of the wrapping, thereby improving the protection effect.

[0021] Reference Figures 3 to 6As shown, a fixing bolt 8 is movably inserted into the lower surface of the cross bar 1, and a threaded channel 9 is opened on the lower surface of the cross bar 1. The top of the threaded channel 9 is connected to the groove 7. The fixing bolt 8 is threadedly connected to the inside of the threaded channel 9. The upper and lower ends of the fixing bolt 8 are provided with hexagonal recesses 10. The bottom end of the fixing bolt 8 extends out of the lower surface of the cross bar 1, and the top of the fixing bolt 8 abuts against the outer surface of the spherical head 6. The hexagonal recess 10 on the lower surface is for facilitating the docking of the tool with the fixing bolt 8 to twist the fixing bolt 8 for rotation. The hexagonal recess 10 on the upper surface is for improving the fit with the spherical head 6 and increasing the friction, thereby improving the locking effect.

[0022] Then use a tool to tighten the fixing bolt 8, so that the fixing bolt 8 slides in the threaded channel 9 and moves toward the inside of the cross bar 1. The top of the fixing bolt 8 slides from the threaded channel 9 into the bottom of the groove 7 and gradually fits with the spherical head 6. The hexagonal recess 10 at the top of the threaded channel 9 can ensure the stability of the clamping between the fixing bolt 8 and the spherical head 6, thereby achieving the effect of locking the spherical head 6, thereby achieving the locking of the connecting rod 2 and the protective head 3, so that the protective head 3 remains in a state of protecting the anterior cruciate ligament.

[0023] Reference Figures 1 to 2 As shown, the side of the crossbar 1 is fixedly connected to an extension rod 4, and the end of the extension rod 4 away from the crossbar 1 is fixedly connected to a handle 5. The overall length of the handle 5 and the extension rod 4 is fifteen centimeters.

[0024] When operating the device, medical staff hold the handle 5. The spiral design on the outer surface of the handle can improve the fit of the grip and avoid slipping. The design of the extension rod 4 allows a buffer distance between the handle 5 and the cross bar 1 to avoid being too close and interfering with other surgical operations.

[0025] Working principle: During unicompartmental knee replacement surgery, according to the specific anatomical structure of the patient's knee joint, the medical staff holds the handle 5, maintains a labor-saving and comfortable holding posture, and rotates the connecting rod 2. Since the crossbar 1 and the connecting rod 2 are connected by a spherical head 6, the characteristics of the spherical head 6 can achieve 360-degree free rotation. The large range of rotation makes it easy to adjust the position of the connecting rod 2 and the protective head 3, so that the protective head 3 corresponds to the position of the anterior cruciate ligament. The protective head 3 is slowly extended between the femur and the tibia, so that the protective head is placed outside the anterior cruciate ligament. The unique semi-cylindrical structure of the protective head 3 can be used to wrap the anterior cruciate ligament inside for protection, and the tilt angle set by the protective head is completely consistent with the actual tilt angle of the anterior cruciate ligament, which can improve the fit effect of the wrapping, thereby improving Protective effect. Next, while ensuring the stability of the connecting rod 2 and the protective head, determine the placement of the cross bar 1, and then use a tool to tighten the fixing bolt 8, so that the fixing bolt 8 slides in the threaded channel 9 and moves toward the inside of the cross bar 1. The top of the fixing bolt 8 slides from the threaded channel 9 into the bottom of the groove 7 and gradually fits with the spherical head 6. The hexagonal recess 10 at the top of the threaded channel 9 can ensure the stability of the card connection between the fixing bolt 8 and the spherical head 6, thereby achieving the effect of locking the spherical head 6, thereby achieving the locking of the connecting rod 2 and the protective head 3, so that the protective head 3 remains in a state of protecting the anterior cruciate ligament until the operation is completed. Rotate the fixing bolt 8 in the opposite direction to separate it from the spherical head 6, and then rotate the cross bar 1 again to remove the protective head 3 from the patient's body.

[0026] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. An adjustable anterior cruciate ligament protection hook for unicompartmental knee replacement, characterized in that: The invention comprises a cross bar (1), wherein a connecting rod (2) is movably provided on the upper surface of the cross bar (1), a protective head (3) is fixedly connected to one end of the connecting rod (2) away from the cross bar (1), and a fixing bolt (8) is movably inserted through the lower surface of the cross bar (1).

2. The adjustable anterior cruciate ligament protection retractor for unicompartmental knee replacement according to claim 1, characterized in that: An extension rod (4) is fixedly connected to the side of the cross bar (1), and an end of the extension rod (4) away from the cross bar (1) is fixedly connected to a handle (5).

3. The adjustable anterior cruciate ligament protection retractor for unicondylar knee replacement according to claim 1, characterized in that: A groove (7) is provided on the upper surface of the crossbar (1), and the groove (7) is in the shape of a sphere with an upper opening.

4. The adjustable anterior cruciate ligament protection retractor for unicondylar knee replacement according to claim 1, characterized in that: The spherical head (6) is movably engaged in the interior of the groove (7).

5. The adjustable anterior cruciate ligament protection retractor for unicompartmental knee replacement according to claim 3, characterized in that: The protective head (3) is configured as a semi-cylindrical structure.

6. The adjustable anterior cruciate ligament protection retractor for unicondylar knee replacement according to claim 1, characterized in that: The protection head (3) and the connecting rod (2) are arranged at an angle, and the angle of inclination is the same as the angle of inclination of the anterior cruciate ligament.

7. The adjustable anterior cruciate ligament protection retractor for unicondylar knee replacement according to claim 1, characterized in that: A threaded channel (9) is provided on the lower surface of the crossbar (1), and the top end of the threaded channel (9) is connected to the groove (7).

8. The adjustable anterior cruciate ligament protection retractor for unicompartmental knee replacement according to claim 7, characterized in that: The fixing bolt (8) is threadedly connected to the interior of the threaded channel (9).

9. The adjustable anterior cruciate ligament protection retractor for unicondylar knee replacement according to claim 8, characterized in that: The fixing bolt (8) is provided with hexagonal notches (10) at both upper and lower ends.

10. The adjustable anterior cruciate ligament protection retractor for unicompartmental knee replacement according to claim 9, characterized in that: The bottom end of the fixing bolt (8) extends out of the lower surface of the cross bar (1), and the top end of the fixing bolt (8) abuts against the outer surface of the spherical head (6).

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