Osteotomy surface grooving tool

Abstract

The present invention relates to an osteotomy surface grooving tool. The osteotomy surface grooving tool includes a body. The body is provided with a contour surface for matching the edge of the tibial osteotomy surface. A fixing hole is formed on the body. The fixing hole is used for inserting a fixing member to fix the osteotomy surface grooving tool to the tibial osteotomy surface. The body is further provided with a column guiding hole for assisting in opening a column hole, and a keel guiding groove for assisting in opening a keel groove. The above osteotomy surface grooving tool improves the efficiency and accuracy of opening and closing the column hole and the keel groove on the tibial osteotomy surface.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an osteotomy surface grooving tool. Background Art

[0002] Unicompartmental knee arthroplasty uses a minimally invasive incision and can retain the anterior and posterior cruciate ligaments of the patient's knee joint at the same time. It has the advantages of small trauma, fast recovery, and good physiological mobility of the patient after surgery. Therefore, unicompartmental knee arthroplasty is widely used in the treatment of unicompartmental osteoarthritis. The unicompartmental knee prosthesis generally includes a tibial tray prosthesis, a liner prosthesis, and a femoral condyle prosthesis. The tibial tray prosthesis is installed on the tibial osteotomy surface. In order to increase the anti-rotation stability of the tibial tray prosthesis, two columns and a keel wing are generally provided at the bottom of the tibial tray prosthesis. Before installing the tibial tray prosthesis, a column hole for accommodating the column and a keel groove for accommodating the keel wing need to be cleared on the tibial osteotomy surface.

[0003] In traditional unicompartmental knee arthroplasty, the column hole and the keel groove on the tibial osteotomy surface are mainly completed through a tibial tray trial mold. Specifically, the doctor uses a tibial size measuring device to measure the size of the tibial osteotomy surface, and then determines the size of the tibial tray prosthesis. Then, by hitting the tibial tray trial mold with the same keel wing characteristics as the tibial tray prosthesis, the keel wing on the tibial tray trial mold squeezes the cancellous bone on the tibial osteotomy surface to form a keel groove for accommodating the keel wing. Then, a drilling tool is used to drill a column hole on the tibial osteotomy surface through the column guiding hole on the tibial tray trial mold. However, the unicompartmental operation space is small, and the bone mass hardness on both sides of the tibial osteotomy surface varies greatly. During the process of hitting the tibial tray trial mold, the tibial tray trial mold is prone to deflect to the side with softer bone mass, resulting in the keel groove and the column hole deviating from the predetermined position, and then the tibial tray prosthesis cannot be installed. Summary of the Invention

[0004] Based on this, it is necessary to provide an osteotomy surface grooving tool for the problem of how to quickly and accurately open a column hole and a keel groove on the tibial osteotomy surface.

[0005] An osteotomy surface grooving tool includes:

[0006] A body, the body is provided with a contour surface for matching the edge of the osteotomy surface, and the body is provided with a fixing hole for inserting a fixing member, a column guiding hole for assisting in opening a column hole, and a keel guiding groove for assisting in opening a keel groove.

[0007] In one embodiment, the body includes an opposite first surface and a second surface, the contour surface connects the first surface and the second surface, and an observation hole penetrating the first surface and the second surface is provided on the contour surface.

[0008] In one embodiment, the number of the observation holes is at least two, and the at least two observation holes are spaced apart and formed on the profile surface.

[0009] In one embodiment, the body further has a first profile groove and a second profile groove. The first profile groove is located on a side of the profile surface close to the keel guiding groove, and the second profile groove is located on a side of the profile surface away from the keel guiding groove.

[0010] In one embodiment, the body includes opposite first and second surfaces, and the first profile groove and the second profile groove are provided on both the first surface and the second surface.

[0011] In one embodiment, a stop surface and an opposing surface are provided in the keel guiding groove; the stop surface and the opposing surface are inclined surfaces approaching each other in the depth direction.

[0012] In one embodiment, the body includes opposite first and second surfaces, and the keel guiding groove includes a first guiding groove provided on the first surface and a second guiding groove provided on the second surface; the first guiding groove communicates with the second guiding groove, and the first guiding groove and the second guiding groove are symmetric with respect to the central cross-section of the body.

[0013] In one embodiment, the fixing holes include a first fixing hole and a second fixing hole, the first fixing hole and the second fixing hole are respectively inclined in opposite directions, and the first fixing hole communicates with the second fixing hole.

[0014] In one embodiment, the body includes at least two column guiding holes, and the at least two column guiding holes are spaced apart.

[0015] In one embodiment, the connection between the fixing hole and the first surface of the body is an inclined surface or a rounded corner; and / or the connection between the column guiding hole and the first surface of the body is an inclined surface or a rounded corner. In one embodiment, the osteotomy surface grooving tool further includes a handle, and the handle is connected to the body.

[0016] The above osteotomy surface grooving tool can be stably fixed to the tibial osteotomy surface through the fixing holes, preventing the osteotomy surface grooving tool from shifting during the grooving process. And by observing whether the contour surface of the body matches the edge of the tibial osteotomy surface of the unicompartmental knee joint, the size of the tibia can be inferred, and then a suitable model of tibial tray prosthesis can be selected. When the contour surface of the body matches the edge of the tibial osteotomy surface of the unicompartmental knee joint, the positions of the stud holes and the keel grooves can be quickly determined on the tibial osteotomy surface through the stud guiding holes and the keel guiding grooves on the body. Compared with the traditional scheme of first measuring the tibia size with a tibia size measuring device and then replacing the tibial tray test mold for grooving, the osteotomy surface grooving tool of the present application combines the characteristics of the traditional tibia size measuring device and the tibial tray test mold. While accurately measuring the size of the tibia, it can quickly and accurately determine the positions of the stud holes and the keel grooves on the tibial osteotomy surface, avoiding frequent replacement of instruments during the operation, improving the operation efficiency, and thus reducing the risk of surgical infection. At the same time, it also avoids the positioning error caused by replacing instruments, further improving the accuracy of grooving positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a schematic structural diagram of the osteotomy surface grooving tool of an embodiment;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the body of the osteotomy surface grooving tool shown in

[0021] Figure 3 is a schematic diagram of the cooperation relationship between the osteotomy surface grooving tool of an embodiment and the tibial osteotomy surface;

[0022] Figure 4 is a schematic structural diagram of the cooperation between the osteotomy surface grooving tool of an embodiment and a cutting tool;

[0023] Figure 5 is a cross-sectional view of the cooperation relationship between the osteotomy surface grooving tool of an embodiment and the tibia and the cutting tool;

[0024] Figure 6Structural sectional view of the keel guiding groove of an osteotomy surface grooving tool according to an embodiment.

[0025] Explanation of reference numerals:

[0026] 10. Body; 101. First surface; 102. Second surface; 11. Contour surface; 111. Observation hole; 12. Fixing hole; 121. First fixing hole; 122. Second fixing hole; 13. Column guiding hole; 14. Keel guiding groove; 141. Stop surface; 142. Opposing surface; 143. First guiding groove; 144. Second guiding groove; 151. First contour groove; 152. Second contour groove; 16. Central cross-section; 20. Handle; 30. Tool; 31. Part of tool 30 passing through keel guiding groove 14; 40. Tibia; 41. Tibial osteotomy surface; 42. Posterior cortical bone. Detailed implementation manners

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] An embodiment of the present application provides an osteotomy surface grooving tool, which is used in cooperation with a tool to open a column hole for accommodating the column of a tibial tray prosthesis and a keel groove for accommodating the keel flank of the tibial tray prosthesis on the tibial osteotomy surface 41 of a unicompartmental knee joint. Among them, the column hole is a blind hole, and the keel groove is a groove with both ends closed. The keel (or keel flank) of the tibial tray prosthesis refers to a sheet-like structure vertically arranged on the distal end surface of the tibial tray prosthesis (the surface in contact with the tibial osteotomy surface), which is used to insert into the tibia from the tibial osteotomy surface to provide support and anchoring force for the tibial tray prosthesis.

[0029] Refer to Figures 1-3 , Figures 1-3 shows the structure of the osteotomy surface grooving tool in an embodiment of the present invention. Specifically, the osteotomy surface grooving tool in an embodiment includes a body 10, the body 10 is provided with a contour surface 11 for matching the edge of the tibial osteotomy surface 41, a fixing hole 12 is opened on the body 10, the fixing hole 12 is used to insert a fixing member to fix the osteotomy surface grooving tool on the tibial osteotomy surface 41, the body 10 is further provided with a column guiding hole 13 for assisting in opening the column hole, and a keel guiding groove 14 for assisting in opening the keel groove. The column guiding hole 13 is a through hole penetrating through two opposite surfaces of the body 10, and the keel guiding groove 14 is a slit penetrating through two opposite surfaces of the body 10.

[0030] Specifically, multiple models of osteotomy surface grooving tools can be set with sizes ranging from small to large. Each model of osteotomy surface grooving tool has a tibial tray prosthesis of the corresponding model. The contour surface 11 of the body 10 is consistent with the outer contour surface of the tibial tray prosthesis of the corresponding model. That is, when the contour surface 11 of the body 10 of the osteotomy surface grooving tool coincides with the edge of the tibial osteotomy surface 41, the tibial tray prosthesis corresponding to the model of this osteotomy surface grooving tool also matches the edge of the tibial osteotomy surface 41. Thus, by observing whether the contour surface 11 of the body 10 matches the edge of the tibial osteotomy surface 41 of the unicompartmental knee joint, the size of the tibia 40 can be inferred, and then a suitable model of tibial tray prosthesis can be selected.

[0031] Furthermore, the fixing member can be a fixing post. The osteotomy surface grooving tool is connected to the tibial osteotomy surface 41 through the fixing member, thereby preventing the osteotomy surface grooving tool from shifting during the grooving process.

[0032] Furthermore, the column guide hole 13 is used for angle guiding and position positioning of opening tools such as drills. Further, at least two column guide holes 13 are provided on the body 10, and the number and position of the column guide holes 13 are consistent with the number and position of the columns on the tibial tray prosthesis. Thus, the opening tool 30 can determine the position of opening the column holes through the column guide holes 13, and then quickly and accurately open the column holes on the tibial osteotomy surface 41. In a preferred embodiment, the connection between the column guide hole 13 and the first surface 101 has an inclined surface or a rounded corner, which is used to enable the columns on the tibial tray prosthesis to quickly and accurately enter the column guide holes 13.

[0033] Furthermore, the keel guide groove 14 is used for angle guiding and position positioning of tools 30 such as saw blades. Further, the position of the keel guide groove 14 is consistent with the position of the keel flanks on the tibial tray prosthesis, and as Figure 4 shown, the part 31 of the tool 30 passing through the keel guide groove 14 has the same shape as the keel flanks. Thus, the position of opening the keel groove on the tibial osteotomy surface 41 can be determined through the keel guide groove 14, and then the keel groove can be quickly and accurately opened on the tibial osteotomy surface 41.

[0034] The above osteotomy surface grooving tool can be firmly fixed on the tibial osteotomy surface 41 through the fixing hole 12, preventing the osteotomy surface grooving tool from shifting during the grooving process. And by observing whether the contour surface 11 of the body 10 matches the edge of the tibial osteotomy surface 41 of the unicompartmental knee joint, the size of the tibia 40 can be inferred, and then a suitable model of tibial tray prosthesis can be selected. When the contour surface 11 of the body 10 coincides with the edge of the tibial osteotomy surface 41 of the unicompartmental knee joint, the positions of the pillar hole and the keel groove can be quickly determined on the tibial osteotomy surface 41 through the pillar guiding hole 13 and the keel guiding groove 14 on the body 10. Compared with the traditional scheme of first measuring the size of the tibia 40 with a tibia size measuring device and then replacing the tibial tray test mold for grooving, the osteotomy surface grooving tool of the present application combines the characteristics of the traditional tibia size measuring device and the tibial tray test mold. While accurately measuring the size of the tibia 40, it can quickly and accurately determine the positions of the pillar hole and the keel groove on the tibial osteotomy surface 41, avoiding frequent replacement of instruments during the operation, improving the operation efficiency, and thus reducing the risk of surgical infection. At the same time, it also avoids the positioning error caused by replacing instruments, further improving the accuracy of grooving positioning.

[0035] Further, referring to Figure 2 , the body 10 includes opposite first surface 101 and second surface 102, the contour surface 11 connects the first surface 101 and the second surface 102, and an observation hole 111 penetrating the first surface 101 and the second surface 102 is provided on the contour surface 11. Specifically, the observation hole 111 is used to conveniently observe whether the contour surface 11 of the body 10 coincides with the edge of the tibial osteotomy surface 41. Specifically, when the edge of the tibial osteotomy surface 41 is larger than the contour surface 11 of the body 10, the edge of the tibial osteotomy surface 41 will protrude from the contour surface 11 of the body 10. At this time, it can be relatively easily observed that the contour surface 11 of the body 10 does not coincide with the edge of the tibial osteotomy surface 41. When the edge of the tibial osteotomy surface 41 is smaller than or coincides with the contour surface 11 of the body 10, due to the obstruction of the body 10 itself, it is not easy to observe whether the contour surface 11 of the body 10 coincides with the edge of the tibial osteotomy surface 41. By providing an observation hole 111 penetrating the first surface 101 and the second surface 102 on the contour surface 11, it is possible to quickly observe whether the contour surface 11 of the body 10 coincides with the edge of the tibial osteotomy surface 41 through the observation hole 111.

[0036] Further, the number of the observation holes 111 is at least two, and at least two observation holes 111 are spaced apart and provided on the contour surface 11. By providing at least two observation holes 111 on the contour surface 11, the observation accuracy can be improved.

[0037] Further, the body 10 is further provided with a first contour groove 151 and a second contour groove 152. The first contour groove 151 is located on the side of the contour surface 11 close to the keel guide groove 14 (i.e., the inner circle of the contour surface 11), and the second contour groove 152 is located on the side of the contour surface 11 away from the keel guide groove 14 (i.e., the outer circle of the contour surface 11). Specifically, the contour surface 11 is used to match the outer contour of the first preselected tibial tray prosthesis. The first contour groove 151 is used to match the outer contour line of the second preselected tibial tray prosthesis; the second contour groove 152 is used to match the outer contour line of the third preselected tibial tray prosthesis; wherein, the model of the second preselected tibial tray prosthesis is smaller than that of the first preselected tibial tray prosthesis; the model of the third preselected tibial tray prosthesis is larger than that of the first preselected tibial tray prosthesis. Preferably, the first preselected tibial tray prosthesis is a tibial tray prosthesis preselected by a doctor according to experience as being suitable for the patient's tibial osteotomy surface 41. The second preselected tibial tray prosthesis is a tibial tray prosthesis one size smaller than the first preselected tibial tray prosthesis, and the third preselected tibial tray prosthesis is a tibial tray prosthesis one size larger than the first preselected tibial tray prosthesis. Thus, by comparing the positional relationship between the tibial osteotomy surface 41 and the contour surface 11, the first contour groove 151, and the second contour groove 152 of the body 10, the model of the tibial tray prosthesis that actually matches the patient's tibial osteotomy surface is determined.

[0038] Further, the first surface 101 and the second surface 102 of the body 10 are both provided with a first contour groove 151 and a second contour groove 152. Since the structure of the lateral tibial tray prosthesis of the knee joint is approximately symmetric with respect to the central sagittal plane of the knee joint compared to the structure of the medial tibial tray prosthesis, the osteotomy surface grooving tool can be flipped over for grooving operations on the symmetric tibial tray prosthesis. Thus, by providing a first contour groove 151 and a second contour groove 152 on both the first surface 101 and the second surface 102, the osteotomy surface grooving tool can be made suitable for opening the column holes and keel grooves of both the lateral tibial tray prosthesis and the medial tibial tray prosthesis. For example, when the first surface 101 abuts against the tibial osteotomy surface 41, the osteotomy surface grooving tool is used to open the column holes and keel grooves of the lateral tibial tray prosthesis. By flipping the osteotomy surface grooving tool so that the second surface 102 abuts against the tibial osteotomy surface 41, at this time the osteotomy surface grooving tool is used to open the column holes and keel grooves of the medial tibial tray prosthesis, thereby improving the versatility of the osteotomy surface grooving tool.

[0039] The first contour groove 151 and the second contour groove 152 can be continuous or discontinuous, and can be as Figures 1-3 shown, not penetrate the first surface 101 and the second surface 102, or can penetrate the first surface 101 and the second surface 102, as long as the mechanical strength of this grooving tool is sufficient. The first contour groove 151 and the second contour groove 152 can also be replaced by contour lines printed on the surface of the grooving tool.

[0040] Refer to Figures 4-5 , in the keel guiding groove 14, there are opposite stopping surfaces 141 and aligning surfaces 142; the stopping surface 141 is used to limit the tool 30; the aligning surface 142 is used to guide the angle of the tool 30. Specifically, the stopping surface 141 and the aligning surface 142 are inclined surfaces approaching each other in the depth direction, where the depth direction refers to the direction perpendicular to the surface and extending from the surface to the depth. During use, the stopping surface 141 is closer to the posterior cortical bone 42 of the tibia 40 than the aligning surface 142. By providing the stopping surface 141 in the keel guiding groove 14, the continuous advancement of the tool 30 after it reaches the position can be restricted, thereby avoiding damage to the posterior cortical bone 42 by the tool 30. Further, the inclination angle of the aligning surface 142 coincides with the side inclination angle of the keel side wall of the tibial tray, so that the aligning surface 142 can provide an accurate advancing inclination angle for the tool 30 and prevent damage to the cruciate ligament.

[0041] Further, refer to Figure 6 , the keel guiding groove 14 includes a first guiding groove 143 provided on the first surface 101 and a second guiding groove 144 provided on the second surface 102; the first guiding groove 143 communicates with the second guiding groove 144, and the first guiding groove 143 and the second guiding groove 144 are symmetric with respect to the central cross-section 16 of the body 10. Here, the central cross-section 16 refers to the plane parallel to the first surface 101 and the second surface 102 and passing through the midpoint in the thickness direction of the osteotomy surface grooving tool, that is, the plane that divides the osteotomy surface grooving tool into two upper and lower pieces with equal thickness. Specifically, the above-mentioned stopping surface 141 and aligning surface 142 are provided in both the first guiding groove 143 and the second guiding groove 144. The stopping surface 141 of the first guiding groove 143 is symmetric with respect to the central cross-section 16 of the body 10 to the stopping surface 141 of the second guiding groove 144. The aligning surface 142 of the first guiding groove 143 is symmetric with respect to the central cross-section 16 of the body 10 to the aligning surface 142 of the second guiding groove 144, so that the first guiding groove 143 and the second guiding groove 144 are respectively applicable to opening the keel groove of the lateral tibial tray prosthesis and the keel groove of the medial tibial tray prosthesis. Furthermore, by flipping the osteotomy surface grooving tool so that the first surface 101 of the osteotomy surface grooving tool abuts against the tibial osteotomy surface 41 or the second surface 102 abuts against the tibial osteotomy surface 41, the keel groove of the lateral tibial tray prosthesis or the keel groove of the medial tibial tray prosthesis can be opened on the tibial osteotomy surface 41, improving the versatility of the osteotomy surface grooving tool.

[0042] The fixing holes 12 include a first fixing hole 121 for fixing the osteotomy surface grooving tool tibia 40 to the outside of the tibial osteotomy surface 41 and a second fixing hole 122 for fixing the osteotomy surface grooving tool to the inside of the tibial osteotomy surface 41. Specifically, the outside of the tibial osteotomy surface 41 is used for installing the lateral tibial tray prosthesis, and the inside of the tibial osteotomy surface 41 is used for installing the medial tibial tray prosthesis. By respectively arranging the first fixing hole 121 and the second fixing hole 122 on the osteotomy surface grooving tool, the osteotomy surface grooving tool can be respectively fixed to the outside and the inside of the tibial osteotomy surface 41, so that the osteotomy surface grooving tool is respectively applicable to opening the column holes and keel grooves of the lateral tibial tray prosthesis and opening the column holes and keel grooves of the medial tibial tray prosthesis.

[0043] Further, the first fixing hole 121 and the second fixing hole 122 are respectively inclined in opposite directions and are communicated with each other. The fact that both the first fixing hole 121 and the second fixing hole 122 are inclined can improve the connection stability between the fixing member inserted into the first fixing hole 121 or the second fixing hole 122 and the tibial osteotomy surface 41. And because the osteotomy surface grooving tool realizes the measurement and grooving of the inside and outside of the tibial osteotomy surface 41 by flipping, by respectively arranging the first fixing hole 121 and the second fixing hole 122 in opposite directions, it can be ensured that after the osteotomy surface grooving tool is flipped, the orientations of the fixing member for fixing the osteotomy surface grooving tool to the outside of the tibial osteotomy surface 41 and the fixing member for fixing the osteotomy surface grooving tool to the inside of the tibial osteotomy surface 41 are the same, which is convenient for surgical operation. In addition, by communicating the first fixing hole 121 and the second fixing hole 122, the space occupied by the fixing hole 12 on the osteotomy surface grooving tool is reduced. In a preferred embodiment, the connection between the fixing hole 12 and the first surface 101 has an inclined surface or a fillet for facilitating the insertion of the fixing member.

[0044] Further, the osteotomy surface grooving tool further includes a handle 20, and the handle 20 is connected to the body 10. The handle 20 is used for a doctor to hold and fix the osteotomy surface grooving tool, which is convenient for surgical operation.

[0045] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0046] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0049] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. It may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0051] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

Claims

1. An osteotomy surface grooving tool for cooperating with a cutting tool to form a column hole for accommodating the column of a tibial tray prosthesis and a keel groove for accommodating the keel wing of the tibial tray prosthesis on the tibial osteotomy surface of a unicompartmental knee joint. Characterized in that, Comprising: A body provided with a contour surface for matching the edge of the osteotomy surface, and a fixing hole for inserting a fixing member, a column guiding hole for assisting in forming the column hole, and a keel guiding groove for assisting in forming the keel groove are formed on the body; The body includes an opposite first surface and a second surface, and the keel guiding groove includes a first guiding groove provided on the first surface and a second guiding groove provided on the second surface; the first guiding groove communicates with the second guiding groove, and the first guiding groove and the second guiding groove are symmetric with respect to the central cross-section of the body. The first guiding groove is used for forming a keel groove suitable for an outer tibial tray prosthesis, and the second guiding groove is used for forming a keel groove suitable for an inner tibial tray prosthesis; A stop surface and an opposing surface are provided in the keel guiding groove; the stop surface and the opposing surface are inclined surfaces approaching each other in the depth direction.

2. The osteotomy surface grooving tool according to claim 1, Characterized in that, The body includes an opposite first surface and a second surface, the contour surface connects the first surface and the second surface, and an observation hole penetrating through the first surface and the second surface is provided on the contour surface.

3. The osteotomy surface grooving tool according to claim 2, Characterized in that, The number of the observation holes is at least two, and at least two of the observation holes are spaced apart and formed on the contour surface.

4. The osteotomy surface grooving tool according to claim 1, Characterized in that, The body is further provided with a first contour groove and a second contour groove, the first contour groove is located on one side of the contour surface close to the keel guiding groove, and the second contour groove is located on one side of the contour surface far from the keel guiding groove.

5. The osteotomy surface grooving tool according to claim 4, Characterized in that, The body includes an opposite first surface and a second surface, and the first contour groove and the second contour groove are provided on both the first surface and the second surface.

6. The osteotomy surface grooving tool according to claim 1, Characterized in that, The fixing hole includes a first fixing hole and a second fixing hole, the first fixing hole and the second fixing hole are respectively inclined in opposite directions, and the first fixing hole communicates with the second fixing hole.

7. The osteotomy surface grooving tool according to claim 1, Characterized in that, The body includes at least two of the column guiding holes, and at least two of the column guiding holes are spaced apart.

8. The osteotomy surface grooving tool according to claim 2, Characterized in that, The connection between the fixing hole and the first surface of the body is a bevel or a fillet; and / or the connection between the column guiding hole and the first surface of the body is a bevel or a fillet.

9. The osteotomy surface grooving tool according to any one of claims 1-8, Characterized in that, The osteotomy surface grooving tool further includes a handle, and the handle is connected to the body.

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