An individualized femoral intramedullary canal positioning device

Abstract

The application relates to an individual femoral intramedullary positioning device and belongs to the technical field of medical instruments, which comprises an individual femoral bottom fixing support, a conversion table rotatably arranged at the upper end of the individual femoral bottom fixing support through an electric rotating shaft, a laser indicator and an electric osteotome arranged on the conversion table, and a central controller arranged outside the conversion table and connected with the electric rotating shaft, the laser indicator and the electric osteotome through wireless signals. The positioning osteotomy device simultaneously has a femoral external force line virtual display positioning structure and an automatic osteotomy structure through integrated arrangement, the positions of the virtual force line and the osteotomy line are directly displayed on the femur through the laser indicator, and the accurate osteotomy position can be directly obtained in combination with the basic positioning of the intramedullary cavity adhering fixing surface, so that the osteotomy can be directly and accurately performed along the laser mark, the problem that the femur is damaged due to too deep drilling and the surgery fails due to inaccurate positioning is solved, the operation steps are simplified, and the surgery efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a personalized femoral intramedullary positioning device. Background Technology

[0002] In clinical practice, artificial knee joint prostheses are used to replace severely damaged knee joint surfaces. The procedure usually involves osteotomizing the tibia and femur perpendicular to the force line to form a rectangular space. Then, the corresponding prosthesis is fitted at the osteotomy site of the tibia and femur to restore and correct the force line. Since the tibial axis coincides with the force line, while the femoral axis has a certain angle with the force line, more precise positioning and osteotomy are required when osteotomizing the femur to ensure successful correction.

[0003] Currently, when performing osteotomy correction of the femur, an electric drill is first used to drill into the lower end face of the femur. After drilling into the medullary canal to a depth of 5-7 cm, a long intramedullary rod is used to continue drilling deeper into the medullary canal. Once the target depth is reached, the intramedullary rod is nailed into the medullary canal. Then, a femoral indicator with a locked angle is fixed to the intramedullary rod. The femoral indicator is then tapped into the designated position to complete the fixation. Next, an osteotomy guide is assembled onto the femoral indicator, ensuring that its osteotomy guidance is perpendicular to the force line of the femoral indicator. Then, osteotomy is performed along the osteotomy guide.

[0004] Currently, existing osteotomy techniques require drilling deep into the intramedullary cavity, which can damage the patient's bones. Furthermore, when drilling deep into the femur with an electric drill, the accuracy of the drilling direction cannot be guaranteed. As a result, the femoral indicator, which uses the intramedullary rod fixed in the drill hole as a reference, cannot accurately indicate the position of the force line, leading to inaccurate osteotomy and failure of the corrective surgery. In addition, the entire positioning and osteotomy operation in existing techniques is very complicated and time-consuming, greatly increasing the difficulty of osteotomy surgery. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose an individualized femoral intramedullary positioning device, which integrates a positioning and osteotomy device that simultaneously features a virtual display positioning structure for the femoral external force line and an automated osteotomy structure, in order to solve the problems of excessive drilling that damages the femur, inaccurate positioning leading to surgical failure, and complicated and time-consuming positioning, assembly, and osteotomy steps in the prior art.

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

[0007] A personalized femoral medullary cavity positioning device includes a personalized femoral base fixation bracket. A conversion platform is rotatably mounted on the upper end of the personalized femoral base fixation bracket via an electric rotating shaft. A laser pointer is fixedly mounted on the lower end of the conversion platform, and an electric osteotomer is fixedly mounted on the upper end of the conversion platform. A central controller is mounted outside the conversion platform, and the central controller is connected to the electric rotating shaft, the laser pointer, and the electric osteotomer via a wireless signal.

[0008] Furthermore, the individualized femoral base fixation bracket includes a medullary canal fitting and fixation surface, a fixation needle guide hole, and a femoral side limiting arc plate. The fixation needle guide hole is fixedly disposed on the top of the medullary canal fitting and fixation surface, and the femoral side limiting arc plate is fixedly connected to the fixation needle guide hole.

[0009] Furthermore, the medullary cavity fitting and fixing surface includes a bone-fitting surface and an outer surface, wherein the bone-fitting surface is fitted to the surface of the distal femoral articular surface.

[0010] Furthermore, side limiting screw guide holes are fixedly provided on both sides of the femoral side limiting arc plate.

[0011] Furthermore, a connector is fixedly provided on the outside of the fixed needle guide hole, one end of the connector is fixedly connected to the connecting groove, and the electric rotating shaft is rotatably disposed between the connecting groove and the conversion table.

[0012] Furthermore, the laser indicator includes an indicator body, with a virtual force line laser irradiator fixedly installed at the lower end of the indicator body, and an ankle line indicator and an osteotomy line indicator respectively connected to the side wall of the indicator via an electric rotating rod.

[0013] Furthermore, the electric osteotomy device includes an electric telescopic rod, a transverse sliding table, a longitudinal depth rod, and an osteotomy saw. The transverse sliding table is connected to the conversion table via the electric telescopic rod. The longitudinal depth rod is fixedly installed on the top of the transverse sliding table, and the front end of the longitudinal depth rod is fixedly connected to the osteotomy saw.

[0014] Furthermore, the transverse sliding platform includes a fixed base and a sliding sleeve. A slide rail is fixedly provided on the upper end of the fixed base, and a slide groove is fixedly provided on the bottom of the sliding sleeve. The slide rail and the slide groove cooperate with each other.

[0015] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

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

[0017] This invention utilizes an integrated positioning and osteotomy device that combines a virtual display and positioning structure for the femoral external force line with an automated osteotomy structure. A laser indicator directly displays the positions of the virtual force line and the osteotomy line on the femur. Combined with the basic positioning of the medullary canal fitting and fixing surface, the accurate position of the femoral joint can be directly determined. This allows for precise osteotomy along the laser-marked area, solving the problems of femoral damage due to excessive drilling and surgical failure due to inaccurate positioning in existing technologies. The integrated positioning and osteotomy device greatly simplifies the assembly and osteotomy procedures, improving surgical efficiency. Attached Figure Description

[0018] Figure 1 For the overall assembly drawing;

[0019] Figure 2 This is a diagram of the overall structure.

[0020] Figure 3 This is a front view of the overall structure;

[0021] Figure 4 This is a side view of the overall structure;

[0022] Figure 5 This is a top view of the overall structure;

[0023] Figure 6 Front view of an individualized femoral base fixation device;

[0024] Figure 7 Top view of an individualized femoral base fixation device;

[0025] Figure 8 Diagram of the overall structure of an individualized femoral base fixation frame;

[0026] Figure 9 This is a control relationship diagram.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Individualized femoral base fixation frame; 2. Medullary canal fitting fixation surface; 3. Central controller; 4. Femoral lateral limiting arc plate; 5. Bone-fitting surface; 6. Lateral surface; 7. Fixation pin guide hole; 8. Connector head; 9. Lateral limiting screw guide hole; 10. Connecting groove; 11. Electric rotating shaft; 12. Converter platform; 13. Laser indicator; 14. Indicator body; 15. Virtual force line laser irradiator; 16. Ankle line indicator; 17. Osteotomy line indicator; 18. Electric osteotomer; 19. Electric telescopic rod; 20. Lateral sliding platform; 21. Longitudinal depth rod; 22. Osteotomy electric saw; 23. Fixation base; 24. Sliding sleeve. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] like Figure 1-9As shown, one embodiment of the present invention provides: a personalized femoral medullary cavity positioning device, including a personalized femoral base fixation bracket 1, the personalized femoral base fixation bracket including a medullary cavity fitting and fixation surface 2, a fixation pin guide hole and a femoral lateral limiting arc plate 4, the medullary cavity fitting and fixation surface including a bone-fitting surface 5 and a lateral surface 6, the personalized femoral base fixation bracket is designed according to the patient's femoral structure obtained by scanning and the force line position in the force line correction plan, wherein the bone-fitting surface is the same as the surface of the distal femoral articular surface and can completely fit the bone. The device comprises a fixing pin guide hole 7 fixedly provided at the upper end of the outer side surface, the hole of which penetrates the entire medullary cavity and fits the fixing surface. A connector head 8 is fixedly provided on the outer side of the fixing pin guide hole. A femoral lateral limiting arc plate is fixedly provided on the outer wall of the fixing pin guide hole below the connector head. The femoral lateral limiting arc plate is fixedly connected to the fixing pin guide hole. Lateral limiting nail guide holes 9 are fixedly provided on both sides of the femoral lateral limiting arc plate for inserting fixing nails to laterally limit the femur. A connecting groove 10 is fixedly sleeved on the connector head. The other end of the connecting groove... An electric rotating shaft 11 is fixedly connected to the system. A conversion platform 12 is fixedly mounted at the other end of the electric rotating shaft. A laser pointer 13 is fixedly mounted at the lower end of the conversion platform. The laser pointer includes a pointer body 14. A virtual force line laser irradiator 15 is fixedly mounted at the lower end of the pointer body. An ankle line pointer 16 and an osteotomy line pointer 17 are respectively connected to the side wall of the pointer via an electric rotating rod. An electric osteotomer 18 is fixedly mounted at the upper end of the conversion platform. The electric osteotomer includes an electric telescopic rod 19 and a transverse... The device comprises a sliding table 20, a longitudinal depth rod 21, and an osteotomy saw 22. An electric telescopic rod is fixedly mounted on the upper end of the conversion table. The upper end of the electric telescopic rod is fixedly connected to a transverse sliding table, which includes a fixed base 23 and a sliding sleeve 24. A slide rail is fixedly mounted on the upper end of the fixed base, and a slide groove is fixedly mounted on the bottom of the sliding sleeve. The slide rail and slide groove cooperate with each other. The upper end of the electric telescopic rod is fixedly connected to the fixed base. A longitudinal depth rod is fixedly mounted on the top of the sliding sleeve, and an osteotomy saw is fixedly mounted at the front end of the longitudinal depth rod. A central controller 3 is installed outside the entire device. The central controller 3 is connected wirelessly to the electric rotating shaft, laser pointer, and electric osteotomy device, and provides remote control functionality for the device.

[0035] In this embodiment, the medullary canal fitting and fixation surface is first fitted to the distal femoral articular surface at a position where it fits tightly. Then, the fixation pin is inserted into the femoral medullary canal along the pin guide hole. After initial fixation, the laser indicator is activated via the central controller. The laser indicator will be adjusted according to the positional relationship between the force line, osteotomy line, and ankle-to-hip line in the corrective treatment plan. The electric rotating rod is controlled to rotate, driving the ankle-to-hip line indicator and osteotomy line indicator so that their emitted light rays align with the force line in the treatment plan. Once the indicator light is determined, the patient's femur is moved so that the femoral ankle is positioned where the simulated ankle-to-hip line can pass through. Then, the fixation... The fixed screw is driven into the femur along the guide hole of the side limiting screw to fix the device. The reason for setting the ankle line is to ensure that the femur is in a normal position during osteotomy, so as to ensure that the normal standard leg shape can still be maintained after the osteotomy prosthesis is installed. After the device fixing base is fixed, the osteotomy line is marked with a marker pen. Then, the electric rotating shaft is controlled by the central controller to drive the conversion table to rotate, so that the position of the laser pointer and the electric osteotomer are swapped. Then, the electric telescopic rod, the transverse sliding table, the longitudinal depth rod and the osteotomy saw are controlled by the central controller, so that they can move to the marked position and perform osteotomy operation along the marked line.

[0036] This embodiment integrates a positioning and osteotomy device that combines a virtual display and positioning structure for the femoral external force line with an automated osteotomy structure. A laser pointer directly displays the positions of the virtual force line and the osteotomy line on the femur. Combined with the basic positioning of the medullary canal fitting and fixing surface, the accurate osteotomy position can be directly determined. This allows for precise osteotomy along the laser-marked area, solving the problems of femoral damage due to excessive drilling and surgical failure due to inaccurate positioning in existing technologies. The integrated positioning and osteotomy device greatly simplifies the osteotomy assembly process and improves surgical efficiency.

[0037] In this embodiment, the positional relationship data of the entire device are all derived from the specific treatment plan obtained by the preoperative femoral scan modeling analysis of the patient. Therefore, in actual operation, it is only necessary to input the positional data through the central controller to control the device to reach the designated position for positioning and osteotomy.

[0038] In this embodiment, the individualized femoral base fixation bracket is modeled using the femoral information of the replacement patient and then 3D printed in one piece, which is conducive to realizing the individualization of the device and ensuring the accuracy of the positioning osteotomy.

[0039] In this embodiment, the electric rotating shaft, laser pointer, and electric osteotomy device are all equipped with rechargeable batteries and signal transceiver processors, which facilitates the reception of control signals from an external central controller.

[0040] In this embodiment, all instruments are coated with a waterproof layer to help prevent infection by bodily fluids during surgery, which could cause instrument malfunction.

[0041] 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 personalized intramedullary femoral medullary positioning device, characterized in that: The device includes an individualized femoral base fixation frame. A conversion platform is rotatably mounted on the upper end of the individualized femoral base fixation frame via an electric rotating shaft. A laser pointer is fixedly mounted on the lower end of the conversion platform, and an electric osteotomer is fixedly mounted on the upper end of the conversion platform. A central controller is located outside the conversion platform and is connected to the electric rotating shaft, laser pointer, and electric osteotomer via a wireless signal. The individualized femoral base fixation frame includes a medullary canal fitting and fixation surface, a fixation pin guide hole, and a femoral lateral limiting arc plate. The fixation pin guide hole is fixedly mounted on the top of the medullary canal fitting and fixation surface. The femoral lateral limiting arc plate is fixedly connected to the fixation pin guide hole. A connector is fixedly mounted on the outside of the fixation pin guide hole, and one end of the connector is fixedly connected to a connecting groove. The electric rotating shaft is rotatably mounted between the connecting groove and the conversion platform.

2. The personalized femoral medullary cavity positioning device according to claim 1, characterized in that: The medullary cavity fitting and fixing surface includes a bone-fitting surface and an outer surface, wherein the bone-fitting surface is fitted to the surface of the distal femoral articular surface.

3. The personalized femoral medullary cavity positioning device according to claim 1, characterized in that: The laser indicator includes an indicator body, with a virtual force line laser irradiator fixedly installed at the lower end of the indicator body. Ankle line indicator and osteotomy line indicator are respectively connected to the side wall of the indicator via an electric rotating rod.

4. The personalized femoral medullary cavity positioning device according to claim 1, characterized in that: The electric osteotomy device includes an electric telescopic rod, a transverse sliding table, a longitudinal depth rod, and an osteotomy saw. The transverse sliding table is connected to the conversion table via the electric telescopic rod. The longitudinal depth rod is fixedly installed on the top of the transverse sliding table, and the front end of the longitudinal depth rod is fixedly connected to the osteotomy saw.

5. The personalized femoral medullary cavity positioning device according to claim 1, characterized in that... The femoral side limiting arc plate is fixedly provided with side limiting nail guide holes on both sides.

6. The personalized femoral medullary cavity positioning device according to claim 4, characterized in that... The horizontal sliding platform includes a fixed base and a sliding sleeve. A slide rail is fixedly provided on the upper end of the fixed base, and a slide groove is fixedly provided on the bottom of the sliding sleeve. The slide rail and the slide groove cooperate with each other.

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