Femoral sighting device

Abstract

The utility model provides a femur sighting device, which relates to the technical field of medical instruments and comprises a front end body and a positioning rod connected with the front end body, positioning tips protruding out of the front end body are respectively arranged on the upper surface and the lower surface of the front end of the front end body, and positioning notches are concavely arranged at the tail end of the front end body at intervals. The distances from any positioning notch to the vertical line of the top end of the positioning tip are equal, the distances from any positioning notch to the same point of the positioning rod are unequal, and an observation window penetrating through the upper face and the lower face of the front end body and located between the positioning notch and the positioning tip is formed in the front end body. The device is wide in observation surface and accurate in positioning.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a femoral aiming device. Background Technology

[0002] Currently, arthroscopic anterior cruciate ligament (ACL) reconstruction is the primary method for treating ACL injuries. The goal of ACL reconstruction is to restore the normal biomechanical function of the ACL and ultimately achieve a return to sports. The effectiveness of ACL reconstruction is influenced by factors such as bone tunnel positioning, graft type, and graft fixation method. Studies have shown that 47.6% of ACL revision patients have improper femoral bone tunnel positioning. Therefore, proper femoral and tibial bone tunnel positioning is crucial for restoring ACL function and ultimately determines the success or failure of ACL reconstruction. The ACL consists of the anteromedial band (AMB) and posterolateral band (PLB). The AMB primarily maintains anteroposterior knee stability, while the PLB primarily controls rotational knee stability. Based on this, some researchers have proposed positioning the femoral end at the original anatomical attachment point of the ACL to restore its normal physiological function.

[0003] Traditional femoral aiming devices have a central through-hole for inserting a positioning pin. The front end of the aiming device has a positioning upturned plate. When in use, the upturned plate is placed on the edge of the cortical bone of the medial wall of the lateral femoral condyle. However, in actual operation, the medial wall of the lateral femoral condyle, especially the posterior wall, is difficult to observe through the normal approach, which easily leads to positioning deviation. Utility Model Content

[0004] The purpose of this invention is to provide a femoral aiming device to solve the technical problems of narrow observation area and inaccurate positioning in the prior art.

[0005] To solve the above problems, the femoral aiming device involved in this utility model adopts the following technical solution:

[0006] The present invention provides a femoral aiming device, including a front end body and a positioning rod connected to the front end body. The front end body has positioning tips protruding from its upper and lower front ends, and positioning notches are recessed at intervals at the rear end of the front end body. The vertical distance from any positioning notch to the top of the positioning tip is equal, and the distance from any positioning notch to the same point of the positioning rod is unequal. An observation window is provided on the front end body, penetrating its upper and lower ends and located between the positioning notch and the positioning tip.

[0007] Preferably, the front end of the front body is set as a pointed tip.

[0008] Preferably, the front end body is configured as a fan-shaped structure, with multiple positioning notches spaced apart sequentially along the circumferential direction of the arc edge of the front end body.

[0009] Preferably, the positioning tip is configured as a conical structure with a diameter that gradually decreases along its axial direction, or the peripheral wall of the positioning tip is configured as a sloping surface on the side facing the tip of the front body.

[0010] Preferably, the positioning rod is located on the same side as the positioning notch.

[0011] Preferably, the centerline of the positioning rod along its length intersects with the tip of the positioning tip.

[0012] The beneficial effects of this utility model are as follows:

[0013] This utility model provides a femoral aiming device, which differs from existing technologies in that it includes a front-end body and a positioning rod connected to the front-end body. The front-end body has protruding positioning tips on its upper and lower front surfaces, and positioning notches are recessed at intervals at its rear end. The perpendicular distance from any positioning notch to the tip of the positioning tip is equal, while the distance from any positioning notch to the same point on the positioning rod is unequal. An observation window is provided on the front-end body, penetrating its upper and lower surfaces and located between the positioning notches and positioning tips. This device facilitates observation of the medial and posterior walls of the lateral femoral condyle, and provides precise positioning. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below:

[0015] Figure 1 This is a structural diagram of the positioning front end;

[0016] Figure 2 This is an intentional design for a femoral aiming device.

[0017] In the diagram: 1. Positioning tip; 2. Observation window; 3. Positioning notch; 4. Positioning rod; 5. Handle. Detailed Implementation

[0018] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] This utility model provides a femoral aiming device, as shown in the figure, including a front body and a positioning rod 4. The front end of the positioning rod 4 is connected to the front body, and the rear end of the positioning rod 4 is connected to the handle 5. The front end of the front body is set as a pointed tip to facilitate insertion into the femur. The upper and lower surfaces of the front end of the front body are respectively provided with positioning tips 1 protruding from the front body. The two positioning tips 1 are symmetrically arranged with respect to the front body. The tail end of the front body is recessed with positioning notches 3 at intervals. The vertical distance from any positioning notch 3 to the top of the positioning tip 1 is equal. Since there are multiple positioning notches 3 and their vertical distances to the top of the positioning tip 1 are equal, this is equivalent to forming multiple equidistant operating reference points around the positioning tip 1. These equidistant positioning notches 3 can provide suitable notches for surgical operation from different angles. The distance from any positioning notch 3 to the same point of the positioning rod 4 is not equal. An observation window 2 is opened on the front body, penetrating its upper and lower surfaces and located between the positioning notches 3 and the positioning tips 1.

[0020] Furthermore, the front end body is designed as a fan-shaped structure, with multiple positioning notches 3 recessed at equal intervals along the circumferential direction of the arc edge of the front end body. The front end of the fan-shaped structure can better conform to the physiological curve of the femur for easy insertion, while the positioning notches 3 set along the circumferential direction of the arc edge provide positioning references from multiple angles. Medical staff can flexibly select the appropriate positioning notch 3 to determine the specific surgical operation site according to the needs of different surgical sites and operating angles.

[0021] Furthermore, the positioning notch 3 on the front-end body is set to two.

[0022] For ease of guidance, the positioning tip 1 is configured as a conical structure with a diameter that gradually decreases along its axial direction, or the peripheral wall of the positioning tip 1 is configured as a sloping surface on the side facing the tip of the front body.

[0023] Positioning rod 4 is positioned on the same side as positioning notch 3. The centerline of positioning rod 4 along its length intersects the tip of positioning tip 1. In femoral-related surgeries, when the femoral aiming device is placed on the femur, after the initial contact position with the femur is determined by positioning tip 1, positioning rod 4, because its centerline intersects with the tip of positioning tip 1, acts like an extended "aiming line." Medical staff can visually determine the spatial relationship between subsequent operating points and the initial positioning point along the direction of positioning rod 4. For example, when determining the drilling position and angle for implanting a fixation device, the direction of positioning rod 4 allows for accurate alignment of the drill bit with the preset position, ensuring that the drilling direction matches the expected femoral anatomy, improving positioning accuracy, and reducing surgical risks caused by positioning deviations.

[0024] To facilitate understanding, this embodiment provides specific data to aid comprehension: The radius of the fan-shaped notch varies from 5-8 mm (0.5 mm intervals) depending on the diameter of the bone tunnel during surgery. The distance between the notch and the axis closer to the aiming rod is 2-3 mm, and the distance between the notch and the axis farther from the aiming rod is 4-6 mm. During surgery, the tip is positioned at the posterior edge of the anterior cruciate ligament attachment point on the femur, at the highest point of the posterior edge of the lateral femoral condyle cartilage. The obstructed position is observed through observation window 2 to aid accurate positioning. Based on the specific surgical situation, an optimal position is selected from the two notches, and the femoral bone tunnel location is marked using a cartilage cone.

[0025] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of this utility model. Any equivalent substitutions and modifications or partial substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A femoral aiming device, comprising: The front end body, the positioning rod connected with the front end body, the positioning tips protruding from the upper and lower surfaces of the front end of the front end body, the positioning notches recessed at intervals at the tail end of the front end body, the vertical distance from any positioning notch to the top end of the positioning tip being equal, the distance from any positioning notch to the same point on the positioning rod being unequal, and the observation window being provided on the front end body and penetrating the upper and lower surfaces of the front end body and being located between the positioning notches and the positioning tips.

2. A femoral aiming device according to claim 1, wherein, The front end of the front end body is provided as a pointed end.

3. A femoral aiming device according to claim 2, wherein, The front end body is provided as a fan-shaped structure, and the plurality of positioning notches are recessed at intervals along the circumferential direction of the arc edge of the front end body.

4. A femoral aiming device according to claim 3, wherein, The positioning tips are provided as conical structures with diameters gradually decreasing along the axial direction thereof.

5. A femoral aiming device according to claim 3, wherein, The peripheral wall of the positioning tip is provided as a slope surface facing the pointed end direction of the front end body.

6. A femoral aiming device according to claim 4 or 5, wherein, The positioning rod is provided on the same side of the positioning notch.

7. The femoral aiming device of claim 1, wherein, The center line of the positioning rod along the length direction thereof intersects with the pointed end of the positioning tip.

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