Unicompartmental femoral osteotomy guide plate

Abstract

The present invention discloses a unicompartmental replacement integrated femoral osteotomy guide plate, which belongs to the technical field of medical devices. It comprises an upper guide plate and a lower pad; the shape of the upper guide plate matches the tibial osteotomy platform, the upper surface of the upper guide plate is provided with a central axis in the front-to-back direction, and a plurality of horizontal lines perpendicular to the central axis, and the lower surface of the upper guide plate is provided with at least two positioning columns; the lower pad is provided with positioning holes matching the positioning columns, and the upper guide plate and the lower pad are fixed as a whole through the positioning columns and the positioning holes, and each upper guide plate is provided with a plurality of lower pads of different thicknesses. The central axis of the upper guide plate can be marked and determined, and then the osteotome can be guided by the horizontal line, and the oscillating saw of the osteotome is kept parallel to the horizontal line, so that the femoral prosthesis force line can be accurately controlled within a reasonable range, and accurate femoral side osteotomy can be guided during the operation, and the internal and external valgus or internal and external rotation deviation during the osteotomy process can be controlled within a reasonable range.

Description

Technical Field

[0001] The invention relates to a unicompartmental replacement integrated femoral osteotomy guide plate, belonging to the technical field of medical devices. Background Art

[0002] Unicompartmental knee arthroplasty (UKA) is an effective method for treating unicompartmental knee osteoarthritis. The correct force line of the unicompartmental prosthesis is significantly correlated with the clinical efficacy and long-term survival rate after knee arthroplasty. In order to establish the correct force line of the unicompartmental prosthesis during surgery, joint surgeons need to use special auxiliary tools to accurately position it. For tibial prosthesis implantation, the existing products all have matching extramedullary osteotomy guides, and the prosthesis is accurately implanted. However, for the implantation of the femoral prosthesis in the lateral compartment, the fixed gasket prosthesis currently used still lacks corresponding auxiliary tools. The implantation process of the prosthesis mainly relies on the experience and judgment of the clinician, and the osteotomy of the femoral side is mainly performed by the surgeon's bare hands. Different doctors' operations are very likely to produce force line deviations, with poor accuracy, which affects the efficacy of the operation and the medium- and long-term survival rate of the prosthesis.

[0003] Therefore, a unicompartmental replacement integrated femoral osteotomy guide plate is designed, which can assist in establishing the correct unicompartmental prosthesis force line, accurately guide the femoral osteotomy during surgery, and control the internal and external valgus or internal and external rotation deviation during the osteotomy process within a reasonable range. More importantly, the guide plate is easy to operate, does not require the aid of complex instruments and equipment, and is more operable. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a unicompartmental replacement integrated femoral osteotomy guide plate, which solves the problem of the current lack of osteotomy guide tools in femoral prosthesis implantation.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0006] A unicompartmental replacement integrated femoral osteotomy guide plate, comprising an upper guide plate and a lower pad;

[0007] The shape of the upper guide plate matches the tibial osteotomy platform, the upper surface of the upper guide plate is provided with a central axis in the front-to-back direction, and a plurality of horizontal lines perpendicular to the central axis, and the lower surface of the upper guide plate is provided with at least two positioning columns;

[0008] The lower pad is provided with a positioning hole matching the positioning column, and the upper guide plate and the lower pad are fixed integrally through the positioning column and the positioning hole. Each upper guide plate is equipped with a plurality of lower pads of different thicknesses.

[0009] As a preferred example, the horizontal lines are multiple parallel lines with a spacing of 2-5 mm.

[0010] As a preferred example, the upper guide plate is made of medical stainless steel plate, wherein the central axis and the horizontal line are carved groove lines.

[0011] The beneficial effects of the present invention are:

[0012] (1) The centerline of the femoral condyle can be marked and determined by the central axis of the upper guide plate, and then the osteotome can be guided by the horizontal line, and the oscillating saw of the osteotome can be kept parallel to the horizontal line, so that the section is always parallel to the horizontal line, and the femoral prosthesis force line can be accurately controlled within a reasonable range, and accurate femoral osteotomy can be guided during the operation, and the internal and external rotation deviations during the osteotomy process can be controlled within a reasonable range;

[0013] (2) Convenient for testing the knee flexion gap. The osteotomy guide can be formed into different thicknesses by replacing the lower pad, which is used to test different thicknesses of joint gaps during surgery;

[0014] (3) Protect the tibial articular surface. When performing osteotomy on the femoral side, the metal upper guide of the osteotomy guide can protect the tibial articular surface and prevent fractures during surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the upper guide plate and the lower pad in a separated state;

[0017] Figure 3 It is a structural schematic diagram of the upper guide plate and the lower pad in the assembled state;

[0018] Figure 4 It is a schematic diagram of the structure of osteotomy guide plates of various sizes;

[0019] Figure 5 This is a schematic diagram of the installation structure of the present invention when used in surgery;

[0020] Figure 6 It is a schematic diagram of the structure of the present invention used in conjunction with an oscillating saw.

[0021] In the figure: upper guide plate 1, central axis 101, horizontal line 102, positioning column 103, 40mm osteotomy guide plate 104, 45mm osteotomy guide plate 105, 50mm osteotomy guide plate 106, lower pad 2, positioning hole 201, tibia 3, osteotomy platform 301, femoral condyle 4, midline 401, oscillating saw 5. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0023] Example 1

[0024] like Figure 1-Figure 3 As shown, a unicompartmental replacement integrated femoral osteotomy guide plate comprises an upper guide plate 1 and a lower pad 2;

[0025] The shape of the upper guide plate 1 matches the osteotomy platform 301 of the tibia 3. The upper surface of the upper guide plate 1 is provided with a central axis 101 in the front-to-back direction, and a plurality of horizontal lines 102 perpendicular to the central axis 101. The lower surface of the upper guide plate 1 is provided with at least two positioning columns 103.

[0026] The lower pad 2 is provided with a positioning hole 201 matching the positioning column 103. The upper guide plate 1 and the lower pad 2 are fixed integrally through the positioning column 103 and the positioning hole 201. Each upper guide plate 1 is equipped with a plurality of lower pads 2 of different thicknesses.

[0027] The horizontal lines 102 are multiple parallel lines with a spacing of 2-5 mm.

[0028] Example 2

[0029] The upper guide plate 1 is made of medical stainless steel plate, wherein the central axis 101 and the horizontal line 102 are carved groove lines. The other structures are the same as those in Example 1. The groove lines are not easy to wear.

[0030] like Figure 4 As shown, before surgery, osteotomy guides of various sizes are prepared ( Figure 4 From left to right in the figure are osteotomy guide plates 104 with an anteroposterior diameter of 40 mm, osteotomy guide plates 105 with a diameter of 45 mm, and osteotomy guide plates 106 with a diameter of 50 mm) to adapt to tibial osteotomy platforms 301 of different sizes; each size of osteotomy guide plate includes an upper guide plate 1 and multiple lower pads 2 of different thicknesses.

[0031] like Figure 5 , Figure 6 As shown in the figure, the method of using the integrated femoral osteotomy guide plate is as follows:

[0032] (1) On the basis of the correct tibial osteotomy 3, the integrated femoral osteotomy guide plate is placed, and it is important to place it snugly with the tibial osteotomy platform 301, close to the medial osteotomy surface and flush with it, and the horizontal plane of the osteotomy guide plate is not turned inside out;

[0033] (2) Using the scale mark 101 of the middle axis of the upper guide plate 1 of the osteotomy guide plate as a reference mark (the middle axis 101 of the upper guide plate 1 is the center line of the femoral prosthesis), gradually straighten the knee joint and mark the middle line 401 at the corresponding position of the femoral condyle 4 with a marker. This middle line 401 is the center line of the femoral prosthesis;

[0034] (3) Lower the height of the operating table. When the surgeon cuts the bone on the surface of the femoral condyle 4, the coronal position of the oscillating saw 5 should always be parallel to the left and right horizontal lines 102 of the osteotomy guide, and the midline 401 of the oscillating saw 5 should be kept consistent with the center line 401 to avoid internal and external rotation of the osteotomy. As the osteotomy is performed from front to back, the knee joint is further flexed until the edge of the posterior condyle is reached.

[0035] (4) When the knee joint is flexed, osteotomy guide plates of different thicknesses are inserted for testing according to the thickness of the osteotomy, and then a prosthesis of corresponding thickness and size is selected for final implantation.

[0036] It has the following advantages:

[0037] (1) The centerline 401 of the femoral condyle 4 can be marked and determined by the centerline 101 of the upper guide plate 1, and then the osteotome is guided by the horizontal line 102, and the oscillating saw 5 of the osteotome is kept parallel to the horizontal line 102, so that the section is always parallel to the horizontal line 102, and the force line of the femoral prosthesis is accurately controlled within a reasonable range, and accurate femoral osteotomy can be guided during the operation, and the deviation of internal and external rotation or internal and external rotation during the osteotomy process can be controlled within a reasonable range;

[0038] (2) It is convenient to test the knee flexion gap. The osteotomy guide can be formed into different thicknesses by replacing the lower pad 2, which is used to test the joint gaps of different thicknesses during surgery;

[0039] (3) Protecting the articular surface of the tibia 3: When performing osteotomy on the femoral side, the metal upper guide plate 1 of the osteotomy guide can protect the articular surface of the tibia 3 and prevent fractures during the operation.

[0040] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A unicompartmental femoral osteotomy guide plate, characterized in that: It includes an upper guide plate and a lower pad; The shape of the upper guide plate matches the tibial osteotomy platform, the upper surface of the upper guide plate is provided with a central axis in the front-to-back direction, and a plurality of horizontal lines perpendicular to the central axis, and the lower surface of the upper guide plate is provided with at least two positioning columns; The lower pad is provided with a positioning hole matching the positioning column, and the upper guide plate and the lower pad are fixed integrally through the positioning column and the positioning hole, and each upper guide plate is equipped with a plurality of lower pads of different thicknesses; The horizontal lines are multiple parallel lines with a spacing of 2-5 mm; The upper guide plate is made of medical stainless steel plate, wherein the central axis and the horizontal line are carved groove lines.

Images