A femoral head rotation navigator

Abstract

The application relates to a femoral head rotation navigator, belonging to the technical field of medical instruments, which comprises a bone-adhesion guide plate, the bone-adhesion guide plate is fixedly provided with a rotating guide needle groove, a fixed guide needle groove 1 and a fixed guide needle groove 2, the rotating guide needle groove is internally provided with a rotating guide needle, an annular scale is arranged on the outer side of the bone-adhesion guide plate and surrounds the rotating guide needle groove, and the fixed guide needle groove 1 and the fixed guide needle groove 2 are both respectively provided with the same fixed guide needle. The navigator is provided with the structure capable of fixing the femur to rotate and the corresponding rotation angle visualized scale dial structure, so that the femoral head rotation is simple and easy to realize under the navigation of the navigator, the femoral head rotation angle can be accurately navigated and controlled, the experience level requirement for the operator is greatly reduced, the success rate of accurate femoral head rotation is greatly improved, and the revision risk is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a femoral head rotation navigator. Background Technology

[0002] Avascular necrosis of the femoral head occurs when the blood supply to the femoral head is damaged or interrupted, leading to the death of bone marrow components and bone cells, followed by tissue repair. This results in structural changes and collapse of the femoral head, causing hip pain and functional impairment. Avascular necrosis of the femoral head can cause difficulty walking, limited hip joint movement, stiffness, or painful limping. If the femoral head collapses, it can be accompanied by lower limb shortening deformity, compensatory pelvic tilt, and the need for crutches. These symptoms severely impact a patient's normal life and work, causing significant physical and psychological harm. Furthermore, avascular necrosis of the femoral head is one of the common diseases causing hip joint disability in young adults; therefore, efficient and precise treatment is crucial.

[0003] Currently, surgical treatments for avascular necrosis of the femoral head include hip replacement surgery and hip-preserving surgery. Due to the limited lifespan and need for periodic revision of artificial hip joints used in hip replacement surgery, hip-preserving surgery is generally preferred when the condition allows. Hip osteotomy in hip-preserving surgery involves rotating and fixing a designated area of ​​the femur to remove the necrotic area from the weight-bearing zone, allowing the non-necrotic area to bear weight, preventing femoral head collapse, and thus maintaining hip joint function. Therefore, highly precise and easily achievable femoral head rotation and stable subsequent fixation are extremely important.

[0004] Currently, femoral head rotation is primarily achieved through the surgeon's experience in bone rotation. The surgeon first identifies and selects the area to be rotated, then makes a cut at the femoral neck. Using their experience, the surgeon rotates the femur to the target position and finally fixes the bones on both sides of the cut to complete the procedure. However, rotating the femur to the target position solely through the surgeon's experience makes it difficult to guarantee precision. Furthermore, there is no other readily available visual data to ensure that the femoral head has been accurately rotated to the target position, leading to a high surgical error rate. Additionally, the inability to quantitatively control the rotation angle results in low precision and frequent incomplete rotation, causing numerous postoperative recovery problems and increasing the risk of revision surgery. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a femoral head rotation navigator to solve the problems in the prior art where there is no navigation structure for precise navigation and positioning of the femoral head rotation, which leads to the inability to accurately control the femoral head rotation angle, requires a high level of surgeon experience, has a high surgical error rate, and a high risk of revision.

[0006] This invention is achieved through the following technical solution:

[0007] A femoral head rotation navigator includes a bone-attaching guide plate, a rotating guide needle groove fixedly disposed on the bone-attaching guide plate, a rotating guide needle disposed inside the rotating guide needle groove, an annular scale surrounding the rotating guide needle groove on the outer side of the bone-attaching guide plate, a dual-purpose pointer for indicating angle scale and assisting rotation disposed on the side wall of the rotating guide needle groove, a fixing groove I fixedly disposed on the left side of the annular scale, and a fixing groove II fixedly disposed on the upper end of the annular scale, and the same fixing needles are disposed in both fixing groove I and fixing groove II.

[0008] Furthermore, the rotating guide needle groove includes a fixed base and a rotating guide groove. The fixed base is rotatably connected to the rotating guide groove. The side wall of the rotating guide groove is provided with a pointer hole for assembling the dual-purpose pointer. The rotating guide needle is provided with a pointer fixing through hole corresponding to the dual-purpose pointer. A clamping element for clamping the femur is fixedly provided at the front end of the rotating guide needle near the needle tip.

[0009] Furthermore, the clamping component includes an inflatable airbag fixedly mounted on the rotating guide needle and a telescopic steel wire mesh mounted on the surface of the inflatable airbag to increase the roughness of the contact surface. The inflatable airbag is connected to an external inflation / deflation device through an air pipe fixedly mounted on the side wall of the rotating guide needle.

[0010] Furthermore, the fixed base and the rotating guide groove are connected by threads.

[0011] Furthermore, the shape of the bone guide plate is the same as the shape of the bone surface at the location where the navigator is to be fixed on the patient, and the positions of the rotating guide needle groove, fixation groove I, and fixation groove II all correspond to the femur.

[0012] Furthermore, the inner side of the bone-attaching guide surface is set as a rough surface.

[0013] Furthermore, the length of the dual-purpose pointer corresponds to the radius of the annular scale.

[0014] Furthermore, the pointer hole is positioned higher than the top of the fixing groove II.

[0015] Furthermore, the center of the annular scale coincides with the center of the rotating guide needle groove.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention, by setting up a navigator that simultaneously has a structure for rotating and fixing the femoral head and a corresponding visual scale dial for the rotation angle, makes the femoral head rotation operation simple and easy to perform under the action of the navigator. The rotation angle of the femoral head is visualized and the rotation angle value can be precisely controlled by navigation, which greatly reduces the requirements for the operator's experience level, greatly improves the success rate of accurate rotation of the femoral head, and greatly reduces the risk of revision surgery. Attached Figure Description

[0018] Figure 1 An overall view of the navigator during operation.

[0019] Figure 2 An overall diagram of the navigator;

[0020] Figure 3 This is a sectional view of the navigator section;

[0021] Figure 4 Enlarged view of the clamping component;

[0022] Figure 5 A schematic diagram of the rotation area of ​​the lesion region;

[0023] Figure 6 This is a schematic diagram of the rotation axis of the femoral head.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Bone guide plate; 2. Rotating guide needle groove; 3. Fixing groove I; 4. Fixing groove II; 5. Fixing base; 6. Rotating guide groove; 7. Pointer hole; 8. Dual-purpose pointer; 9. Greater trochanter surface; 10. Femur; 11. Rotating guide needle; 12. Clamping device; 13. Needle; 14. Inflatable airbag; 15. Telescopic wire mesh; 16. Air tube; 17. Circular scale; 18. Fixing guide needle. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0031] like Figure 1-6 As shown, one embodiment of the present invention provides a navigator including a bone-attaching guide plate 1. A rotating guide pin groove 2, a fixing groove I 3, and a fixing groove II 4 are fixedly disposed on the bone-attaching guide plate. The bone-attaching guide plate, the rotating guide pin groove, the fixing groove I, and the fixing groove II are all manufactured by 3D printing. The inner surface of the bone-attaching guide plate completely matches the bone surface of the area to be attached. The rotating guide pin groove includes a fixing base 5 and a rotating guide groove 6 that are threaded together and rotatable. A pointer hole 7 is provided on the side wall of the rotating guide groove, and a dual-purpose pointer 8 is disposed in the pointer hole. After the bone-attaching guide plate is attached to the surface 9 of the greater trochanter, a rotating guide pin 11 that can penetrate the greater trochanter and the cross-section and then be inserted into the femur 10 is nailed into the rotating guide pin groove. A dual-purpose pointer 8 is provided on the side wall of the rotating guide pin. A through hole adapted to the pointer allows the dual-purpose pointer to pass through the pointer hole and be inserted into the through hole to fix the dual-purpose pointer and the rotating guide needle. A clamping member 12 is fixedly installed at the front end of the rotating guide needle, and a needle head 13 is fixedly installed at the top of the clamping member. The needle head is fixedly connected to the rotating guide needle. The clamping member includes an inflatable airbag 14 fixedly installed on the rotating guide needle and a telescopic steel wire mesh 15 installed on the surface of the inflatable airbag to increase the roughness of the contact surface. The inflatable airbag is connected to an external inflation and deflation device through an air tube 16 fixedly installed on the side wall of the rotating guide needle. An annular scale 17 is provided around the rotating guide needle groove on the outside of the bone guide plate. Fixing groove I is located on the left side of the annular scale, and fixing groove II is located at the upper end of the annular scale. The same fixing guide needle 18 is respectively arranged in fixing groove I and fixing groove II.

[0032] In this embodiment, the bone guide plate on the navigator is first attached to the surface of the greater trochanter of the femoral neck that has been cut by medical personnel. After attachment, Kirschner wires are driven into the bone along the groove of the rotating guide wire, so that the Kirschner wires are driven through the cut surfaces at the greater trochanter and the femoral neck in sequence and finally driven into the femur to form an initial channel. Then, the initial channel is widened to form a widened channel using a hole-expanding screw. Then, the rotating guide wire is driven through the widened channel and finally driven into the femur. At the same time, a small gap is maintained between the cut surfaces on both sides of the greater trochanter and the femur to facilitate subsequent rotation. After the driving is completed, the air bladder of the clamping part is inflated by an inflator. The expansion of the air bladder causes the telescopic wire mesh on its outer side to expand as well, thereby pressing the wire mesh against the wall of the widened channel hole, greatly increasing the friction, so as to drive the rotating guide wire into the widened channel and complete the clamping.

[0033] The dual-purpose pointer is passed through the pointer hole and inserted into the through hole on the rotating guide pin to fix the dual-purpose pointer and the rotating guide pin. Then, the navigator is rotated according to the femoral rotation angle obtained from the analysis of 3D reconstructed medical images. The dual-purpose pointer is manually rotated to point to the target angle value. When the dual-purpose pointer is manually rotated, it simultaneously drives the rotating guide pin and the rotating guide groove to rotate. Because the rotating guide pin is clamped inside the femur, it also drives the femoral head to rotate at the same rotation angle. During this process, the rotating guide groove rotates through the threaded connection to the fixed base. Finally, the dual-purpose pointer stops rotating when it points to the target angle. At this time, the femoral head has also completed the target angle rotation task. Then, the two fixing guide pins are nailed in along fixing groove I and fixing groove II. Finally, the greater trochanter and the femoral neck are connected and fixed at the cross section to complete the precise femoral rotation operation with visualized angle. Then, the air inside the airbag is deflated using an inflator to eliminate the clamping force of the rotating guide pin. Then, the dual-purpose pointer and the rotating guide pin are pulled out to complete the entire femoral rotation operation.

[0034] This embodiment sets up a navigator that simultaneously has a structure for rotating and fixing the femur and a corresponding visual scale dial for the rotation angle. This makes the femoral head rotation operation simple and easy to perform under the navigator's function. The femoral head rotation angle is visualized and the rotation angle value can be precisely controlled by navigation. This greatly reduces the skill level required of the operator, significantly improves the success rate of accurate femoral head rotation, and greatly reduces the risk of revision surgery.

[0035] In this embodiment, the shape of the bone guide plate is the same as the shape of the bone surface where the navigator is to be fixed. The positions of the rotating guide needle groove, the fixed guide needle groove I, and the fixed guide needle groove II are all designed based on the precise data obtained from the 3D reconstructed medical images, and correspond to the femur to be rotated.

[0036] In this embodiment, the inner side of the bone-attaching guide surface is set as a rough surface to ensure that the femoral guide surface will not slip when it is attached to the surface of the greater trochanter femur, thus maintaining stability.

[0037] In this embodiment, the pointer hole is positioned higher than the top of the fixing slot II to prevent motion interference, ensuring that the dual-purpose pointer will not be interfered with by the fixing slot and will not be unable to rotate normally when it rotates.

[0038] In this embodiment, the length of the dual-purpose pointer corresponds to the radius of the circular scale, which makes it easier and clearer to read the angle value. The dual-purpose pointer serves as both an angle dial pointer and a handle for rotating the angle, simplifying operation and structure and improving efficiency.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A femoral head rotation navigator, comprising: The navigator includes an osteophyte guide plate, on which a rotating guide needle groove is fixedly mounted. A rotating guide needle is disposed inside the rotating guide needle groove. An annular scale is arranged around the rotating guide needle groove on the outer side of the osteophyte guide plate. A dual-purpose pointer for indicating angle and assisting rotation is provided on the side wall of the rotating guide needle groove. A fixing groove I is fixedly mounted on the left side of the annular scale, and a fixing groove II is fixedly mounted on the upper end of the annular scale. Identical fixing needles are respectively disposed in fixing groove I and fixing groove II. The rotating guide needle groove includes a fixed base and a rotating guide groove. The fixed base is rotatably connected to the rotating guide groove. A pointer hole for assembling the dual-purpose pointer is opened on the side wall of the rotating guide groove. A pointer fixing through hole corresponding to the dual-purpose pointer is opened on the rotating guide needle. The front end of the rotating guide needle is near... A clamping element for securing the femur is fixedly installed near the needle tip; the clamping element includes an inflatable airbag fixedly installed on the rotating guide needle and a telescopic steel wire mesh installed on the surface of the inflatable airbag to increase the roughness of the contact surface. The inflatable airbag is connected to an external inflation / deflation device through an air tube fixedly installed on the side wall of the rotating guide needle; the fixed base is threadedly connected to the rotating guide groove; the shape of the bone-attaching guide plate is the same as the shape of the bone surface at the location where the navigator is to be fixed on the patient; the positions of the rotating guide needle groove, fixing groove I, and fixing groove II all correspond to the femur; the inner side of the bone-attaching guide plate is set as a rough surface; the length of the dual-purpose pointer corresponds to the radius of the annular scale; the position of the pointer hole is higher than the top of the fixing groove II; the center of the annular scale coincides with the center of the rotating guide needle groove.

Images