Unicompartmental femoral prosthesis positioning guide

Abstract

The utility model relates to the technical field of positioning guides, and discloses a positioning guide for a unicompartmental replacement femoral prosthesis, comprising: a base, a first hole is provided on one side of the rear end of the base, a second hole is provided on one side of the front end of the base, the first hole is higher than the second hole, and Kirschner wires are installed inside the first hole and the second hole; an arc panel is provided on the left side of the lower end of the base, a fixing plate is provided on the left end of the arc panel, and the fixing plate is fixedly connected to the arc panel. The utility model provides two holes, and two Kirschner wires pass through the holes to puncture inward to form a staggered positioning, so that the positioning is more stable and accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of positioning guides, in particular to a positioning guide for a unicompartmental replacement femoral prosthesis. Background Art

[0002] Unicompartmental knee replacement is an important part of the step-by-step treatment of knee osteoarthritis. It is a surgery for the lesions of the unicompartment of the knee joint, with the purpose of preserving the normal structure of the patient's knee joint as much as possible. Compared with traditional total knee replacement surgery, unicompartmental knee replacement surgery is more minimally invasive, with a more natural gait, faster functional recovery, and higher satisfaction after surgery; and later revision is relatively easy. Therefore, unicompartmental knee replacement surgery represented by Oxford is widely used in clinical practice. One of the difficulties of unicompartmental knee replacement is to accurately place the femoral prosthesis in the middle of the medial femoral condyle. If the prosthesis is biased to the medial side, it may cause harassment to the medial collateral ligament, while if it is biased to the lateral side, it may cause intercondylar filling and cruciate ligament wear. At present, the midline of the medial femoral condyle is determined by measuring with a soft ruler or visually, and then the femoral osteotomy template is installed for osteotomy. There are defects such as operation errors and inability to repeatedly confirm and check during the operation. Therefore, a positioning structure is needed.

[0003] For example, the Chinese authorized patent document with the publication number CN 212234577 U (midline positioning guide for femoral condyle in knee replacement): comprising a base, the base is provided with a first guide hole and a second guide hole for passing through the base, the axis of the first guide hole is parallel to the axis of the second guide hole, and also comprises a positioning center column inserted in the first guide hole, the first center column is provided with a coaxial alignment center hole for passing the Kirschner wire, and the positioning center column cooperates with the first guide hole. The utility model achieves the effect of being able to drill more accurately.

[0004] When this device is drilling, the hole diameter is larger and the drill bit is also larger. When the diameter of the drill bit is larger, the end face of the hole will be relatively flat and rough. This drill bit is prone to slipping during the drilling process, resulting in drilling positioning failure; when an error is found during installation, the position needs to be changed for secondary drilling positioning. The device needs to be pre-positioned for both the initial and secondary drilling. When fine-tuning is required, the horizontal position of the secondary drilling remains unchanged, only the longitudinal angle is slightly adjusted. When the drill bit is relatively thick, the end face of the hole is prone to slipping. Once the patient's femur is strong, the path of the secondary drilling is very close to the path of the original hole. In this way, in actual operation, the secondary drilling will return to the original hole of the initial drilling, and it is difficult to make fine adjustments. The above-mentioned comparative document only used a Kirschner wire to overlap the positioning hole for nailing positioning, and the positioning was inaccurate. Most of them did not perform positioning, but just held it steady and drilled directly after measurement. After the patient's skin and bones are incised, the positioning guide is prone to slipping, which can easily lead to positioning failure. Therefore, a positioning guide for a unicompartmental femoral replacement is proposed. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies of the prior art, the utility model provides a positioning guide for a unicompartmental femoral prosthesis replacement to solve the problems raised in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a positioning guide for a unicompartmental femoral prosthesis, comprising:

[0009] A substrate, wherein a first hole is disposed on one side of the rear end of the substrate, and a second hole is disposed on one side of the front end of the substrate, the first hole is higher than the second hole, and Kirschner wires are installed inside the first hole and the second hole;

[0010] The arc panel is arranged on the left side of the lower end of the base body. A fixing plate is arranged on the left end of the arc panel, and the fixing plate is fixedly connected to the arc panel.

[0011] Preferably, a fixed block is provided at the lower end of the base body, and a movable plate is provided on one side of the lower end of the fixed plate outside the fixed block, and the movable plate is fixedly connected to the fixed block.

[0012] Preferably, a sliding block is provided on the right side of the exterior of the fixed block, and the sliding block is fixedly connected to the fixed block; an inner cavity is provided on the right side of the interior of the base body, and the sliding block is slidably connected to the inner cavity.

[0013] Preferably, a transmission screw is rotatably installed inside the inner cavity, and the transmission screw is connected to the slider through threaded cooperation, and a transmission bevel gear is arranged on the upper end of the transmission screw, and the transmission screw is used to control the lifting and lowering of the slider.

[0014] Preferably, a driving bevel gear is rotatably installed on the right side of the upper end of the inner cavity, and the driving bevel gear is meshingly connected with the transmission bevel gear. A fixed gear is provided on the right side of the driving bevel gear located outside the base body, and a turntable is fixedly provided on the right side outside the fixed gear, and the turntable is used to control the rotation of the driving bevel gear.

[0015] Preferably, a fixing platform is provided on the right side of the outside of the base at the lower end of the fixed gear, a spring sheet is fixedly installed on the upper end of the fixing platform, a limit strip is fixedly provided on the upper end of the spring sheet, and the spring sheet enables the limit strip to have a reset function, thereby facilitating the limiting of the fixed gear.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a positioning guide for a unicompartmental femoral prosthesis replacement, which has the following beneficial effects:

[0018] The utility model respectively passes two Kirschner wires through the first hole and the second hole. The two Kirschner wires are at different heights and puncture inward to form a staggered positioning. The positioning is more stable and accurate, and the positioning guide is effectively prevented from sliding during drilling. The positioning guide is ensured to be accurately positioned when drilling the prosthesis positioning hole, thereby solving the problems raised in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0020] Figure 2 It is a cross-sectional view of the overall structure of the utility model;

[0021] Figure 3 For the utility model Figure 2 A partial enlarged view of area A.

[0022] In the figure: 1. base; 2. arc panel; 3. fixed plate; 4. movable plate; 5. fixed block; 6. first hole; 7. second hole; 8. Kirschner wire; 9. slider; 10. inner cavity; 11. transmission screw; 12. transmission bevel gear; 13. driving bevel gear; 14. fixed gear; 15. turntable; 16. fixed table; 17. spring; 18. limit strip. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The utility model provides a technical solution, a positioning guide for a unicompartmental femoral prosthesis, see Figure 1 , Figure 2 and Figure 3 ,include:

[0025] A substrate 1, a first hole 6 is provided on one side of the rear end of the substrate 1, a second hole 7 is provided on one side of the front end of the substrate 1, the first hole 6 is higher than the second hole 7, and Kirschner wires 8 are installed inside the first hole 6 and the second hole 7;

[0026] The curved panel 2 is arranged on the left side of the lower end of the base body 1 . A fixing plate 3 is arranged on the left end of the curved panel 2 , and the fixing plate 3 is fixedly connected to the curved panel 2 .

[0027] See also Figure 1 A fixed block 5 is arranged at the lower end of the base body 1 , and a movable plate 4 is arranged on one side of the lower end of the fixed plate 3 outside the fixed block 5 , and the movable plate 4 is fixedly connected to the fixed block 5 .

[0028] See also Figure 2 and Figure 3 A slider 9 is provided on the right side outside the fixed block 5 , and the slider 9 is fixedly connected to the fixed block 5 ; an inner cavity 10 is provided on the right side inside the base body 1 , and the slider 9 is slidably connected to the inner cavity 10 .

[0029] See also Figure 2 and Figure 3 A transmission screw 11 is rotatably installed inside the inner cavity 10, and the transmission screw 11 is connected to the slider 9 through threaded cooperation. A transmission bevel gear 12 is provided at the upper end of the transmission screw 11, and the transmission screw 11 is used to control the lifting and lowering of the slider 9.

[0030] See also Figure 2 and Figure 3 A driving bevel gear 13 is rotatably installed on the right side of the upper end of the inner cavity 10, and the driving bevel gear 13 is meshed and connected with the transmission bevel gear 12. A fixed gear 14 is provided on the right side of the driving bevel gear 13 located outside the base 1, and a turntable 15 is fixedly provided on the right side outside the fixed gear 14. The turntable 15 is used to control the rotation of the driving bevel gear 13.

[0031] See also Figure 2 and Figure 3 A fixing platform 16 is provided on the right side of the outside of the base 1 at the lower end of the fixed gear 14, a spring piece 17 is fixedly installed on the upper end of the fixing platform 16, and a limit strip 18 is fixedly provided on the upper end of the spring piece 17. The spring piece 17 enables the limit strip 18 to have a reset function, thereby facilitating the limiting of the fixed gear 14.

[0032] This solution: by passing two Kirschner wires 8 through the first hole 6 and the second hole 7 respectively, the two Kirschner wires 8 are at different height positions and are pierced inward to form a staggered positioning, the positioning is more stable and accurate, and the positioning guide is effectively prevented from sliding during drilling, ensuring that the positioning guide is accurately positioned when drilling the prosthesis positioning hole. The movable plate 4 is used to abut against the end of the tibia, and the fixed plate 3 is used to abut against the end of the femur. When the position of the movable plate 4 needs to be adjusted, the turntable 15 is rotated, and the driving bevel gear 13 at one end of the turntable 15 rotates, and the transmission bevel gear 12 engages and transmits the transmission screw 11 to rotate, and the slider 9 and the transmission screw 11 convert the rotational motion of the transmission screw 11 into the linear motion of the slider 9 under the threaded cooperation, thereby driving the fixed block 5 and the movable plate 4 to rise and fall.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning guide for a unicompartmental femoral prosthesis, characterized in that: include: A base body (1), wherein a first hole (6) is provided on one side of the rear end of the base body (1), and a second hole (7) is provided on one side of the front end of the base body (1), the first hole (6) is higher than the second hole (7), and Kirschner wires (8) are installed inside the first hole (6) and the second hole (7); The arc panel (2) is arranged on the left side of the lower end of the base (1), and a fixing plate (3) is arranged on the left end of the arc panel (2), and the fixing plate (3) is fixedly connected to the arc panel (2).

2. The unicompartmental femoral prosthesis positioning guide according to claim 1, characterized in that: A fixed block (5) is provided at the lower end of the base (1), and a movable plate (4) is provided on one side of the lower end of the fixed plate (3) outside the fixed block (5), and the movable plate (4) is fixedly connected to the fixed block (5).

3. The positioning guide for a unicompartmental femoral prosthesis according to claim 2, characterized in that: A sliding block (9) is provided on the right side of the exterior of the fixed block (5), and the sliding block (9) is fixedly connected to the fixed block (5); an inner cavity (10) is provided on the right side of the interior of the base body (1), and the sliding block (9) is slidably connected to the inner cavity (10).

4. The positioning guide for a unicompartmental femoral prosthesis according to claim 3, characterized in that: A transmission screw (11) is rotatably mounted inside the inner cavity (10), and the transmission screw (11) is connected to the slider (9) through threaded matching, and a transmission bevel gear (12) is arranged at the upper end of the transmission screw (11).

5. The positioning guide for a unicompartmental femoral prosthesis according to claim 4, characterized in that: A driving bevel gear (13) is rotatably mounted on the right side of the upper end of the inner cavity (10), and the driving bevel gear (13) is meshingly connected with the transmission bevel gear (12); a fixed gear (14) is arranged on the right side of the driving bevel gear (13) and located outside the base (1); a rotating disk (15) is fixedly arranged on the right side outside the fixed gear (14).

6. The positioning guide for a unicompartmental femoral prosthesis according to claim 5, characterized in that: A fixing platform (16) is provided on the right side of the outside of the base body (1) at the lower end of the fixing gear (14), a spring sheet (17) is fixedly mounted on the upper end of the fixing platform (16), and a limiting strip (18) is fixedly provided on the upper end of the spring sheet (17).

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