![]() Bone anchor for an upper or lower jaw with a corresponding drilling jig
专利摘要:
The invention relates to a set with a bone anchor (2) for an upper or lower jaw (1.17) and a corresponding drilling jig (10) for drilling holes in the jaw (1.17), the drilling jig (10) being contains anchor plate (3 ') the shape and dimensions of which are substantially the same as those of at least the bone side (8) of the anchor plate (3) of the bone anchor (2), the drilling template (10) having a connecting element (6') rigidly connected to the anchor plate (3 ') and the shape and dimensions of which are substantially the same as those of the connecting element (6) of the bone anchor (2), a drill guide (12) connecting to each of said recesses (11) provided on the drilling jig (10) allowing to properly guide a drill to drill holes in the jaw (1,17). 公开号:BE1026696B1 申请号:E20180124 申请日:2018-10-08 公开日:2020-05-13 发明作者:Clerck Hugo De 申请人:Tita Link B V B A; IPC主号:
专利说明:
Bone anchor for an upper or lower jaw with a corresponding drilling jig The invention relates to a bone anchor for an upper or lower jaw and an associated drilling jig for drilled holes in the jaw for screw mounting the bone anchor against the bone of the jaw. This bone anchor includes an anchor plate provided with openings for said screws, a fastener for mounting aids and has an elongated connecting member extending between the fastener and the anchor plate. The connecting element is rigidly connected to the anchor plate and should extend through gingiva or mucosa into the oral cavity so that the fastener is located in the oral cavity. The anchor plate has a bone side, which is to adjoin said bone of the jaw, and an opposite free side. The drilling template has recesses whose mutual position corresponds to the mutual position of said openings in the bone anchor. Connected to each of said recesses of the drilling jig is a drill guide allowing to properly guide a drill through the drill guide and through the corresponding recess to provide said drill holes in the jaw. According to the prior art, in order to prepare the jaw for placing a bone anchor, a drilling jig is placed against the jaw. This drilling template allows a drill to be guided to drill holes in predetermined positions in the jaw. After removing the drilling template, the bone anchor is attached to the jaw with screws, these screws being fastened in said drill holes. Such bone anchors are attached, for example, in the upper jaw to the bone on or in the vicinity of the transition between the Maxilla and the Arcus Zygomati. Taking into account the presence of muscle and other tissues, the space to place a drilling template here in the oral cavity is very limited. In particular, it is difficult to place the drill jig in a correct position, which has been predetermined, against the bone of the jaw. Even if the drilling template is correctly positioned, it remains difficult to keep the drilling template in the correct position when performing the drillings. In addition, the space in the oral cavity is relatively small to one BE2018 / 0124 easy way to use a drilling tool in the oral cavity to make the desired holes in the bone. The invention aims to overcome these drawbacks by proposing a drilling jig that allows to drill holes in a jaw for mounting the associated bone anchor, whereby this drilling jig can be easily positioned in a correct position within the limited space which is available in the oral cavity. In addition, the invention aims to propose a drilling template that can be designed in an extremely simple manner and this for a relatively limited cost. For this purpose, the drilling template, according to the invention, includes an anchor plate with a bone side, at least the shape and dimensions of this bone side being substantially the same as those of the bone side of the anchor plate of the bone anchor. The drilling template furthermore has a connecting element which is rigidly connected to the anchor plate of the drilling template and whose shape and dimensions are substantially the same as those of the connecting element of the bone anchor, whereby a drilling guide is provided adjacent to each of said recesses of the drilling template. to appropriately guide a drill to drill holes in the jaw. Advantageously, said drilling template connecting element has the same orientation and position with respect to the anchor plate of the drilling template as the connecting element of the bone anchor with respect to the anchor plate of the drilling template. Advantageously, one end of the connecting element of the drilling jig, which is opposite the end connected to the anchor plate of the drilling jig, has a reference member whose shape and dimensions correspond substantially to that of said fastening member, the relative position of the reference relative to the anchor plate of the drilling template corresponds to the relative position of the fastener relative to the anchor plate of the bone anchor. According to an interesting embodiment of the invention, said drill guides are removable from said drilling jig to convert the latter into said bone anchor. The invention also relates to a method for manufacturing at least a bone anchor and a corresponding drilling jig for an upper or lower jaw, wherein the bone anchor has an anchor plate which must be fixed with one or more screws against the surface of the bone of the jaw in question. . The BE2018 / 0124 bone anchor anchor plate exhibits a bone side which is to adjoin the surface of the bone and has a free side opposite to said bone side. Furthermore, this bone anchor has an elongated connecting element which extends between a fastening member and the anchor plate and is rigidly connected to the latter. This connecting element should extend through gingiva or mucosa into the oral cavity so that the fastener is located in the oral cavity. In the method according to the invention, a model of the bone anchor is designed starting from a three-dimensional digital model of the bone of the jaw and on the basis of this model of the jaw, a position and orientation for each of said one or more screws is chosen depending on the structure and density of the bone. Thus, a borehole with a borehole axis is defined for said screws, and corresponding openings for these screws are provided in the bone anchor model. This method is characterized in that said drilling template is designed from the model of said bone anchor to which drilling guides are added which have a cylindrical recess with a central axis coinciding with said drill hole axis for guiding a drill. The bone anchor and / or the drilling template are then, preferably, made from, for example, titanium by an additive manufacturing technique. Other details and advantages of the invention will become apparent from the following description of some specific embodiments of the bone anchor and the associated drilling jig and of the method of manufacturing them, according to the invention. This description is given as an example only and does not limit the scope of the protection sought; the reference numbers used hereinafter refer to the attached figures. Figure 1 is a schematic front view of a three-dimensional image or model of a portion of an upper jaw. Figure 2 represents the view of Figure 1 with a bone anchor model added on the left and right sides of the maxilla. Figure 3 represents the view of Figure 1, with a model of a drilling template added on the left and on the right side of the upper jaw. BE2018 / 0124 Figure 4 is a schematic perspective view of a bone anchor of Figure 2 viewed along the free side of the anchor plate. Figure 5 is a schematic perspective view of the bone anchor of Figure 4 viewed along the bone side of the anchor plate. Figure 6 is a schematic perspective view of a drilling jig of Figure 2 viewed along the free side of its anchor plate. Figure 7 is a schematic perspective view of the drilling jig of Figure 6 viewed along the bone side of the anchor plate. Figure 8 is a schematic front view of a three-dimensional image or model of a portion of a lower jaw. Figure 9 represents the view of Figure 8 with a bone anchor model added on the left and right sides of the lower jaw. Figure 10 represents the view of Figure 8, with a model of a drilling template added on the left and on the right side of the lower jaw. Figure 11 is a schematic perspective view of a bone anchor of Figure 9 viewed along the free side of the anchor plate. Figure 12 is a schematic perspective view of the bone anchor of Figure 9 viewed along the bone side of the anchor plate. Figure 13 is a schematic perspective view of a drilling jig of Figure 10 viewed along the free side of its anchor plate. Figure 14 is a schematic perspective view of the drilling jig of Figure 6 viewed along the bone side of the anchor plate. In the different figures, like reference numerals refer to like or analogous elements. The invention generally relates to a bone anchor and a drilling jig associated with this bone anchor. The drill jig allows to drill holes in the jaw at predetermined positions and according to predetermined orientations so that the bone anchor can be attached to the jaw at a planned position with screws thus extending into the bone of the jaw in a predetermined orientation stretch out. Such a bone anchor is already known per se to the skilled person and has a fastening member which must extend in the oral cavity and to which orthodontic or orthopedic aids can be mounted. BE2018 / 0124 In recent applications of such bone anchors, they should absorb relatively large forces. This is the case, for example, when these are used to move a lower jaw relative to an upper jaw, with relatively large loads being exerted on the bone anchors. In order to attach it to the jaw as tightly as possible, these are individually designed for a patient, designed to allow an anchor plate of the bone anchor to fit snugly to the surface of the bone of the jaw. The bone anchor is attached to the jaw with screws. Thus, an orientation and position for these screws is also chosen such that they extend in as strong a bone as possible. Figures 4 and 5 show an example of a bone anchor 2. This bone anchor 2 contains an anchor plate 3 provided with openings 4 through which screws have to be screwed into the bone of the jaw to fix the bone anchor 2 against the jaw. Furthermore, this bone anchor 2 has a fastening member 5 for mounting aids, wherein elongated connecting element 6 extends between the fastening member 5 and the anchor plate 3. This connecting element 6 also preferably fits closely against the bone of the jaw 1 and is rigidly connected to the anchor plate 2. When the bone anchor 2 is fastened to the jaw 1, the connecting element 6 should extend through the gingiva or mucosa into the oral cavity so that the fastener 5 is located in the oral cavity. Preferably, the connecting element 6 extends through solid gums, showing a circular cross section 7 at the location where it passes through the gums. Furthermore, the anchor plate 2 has a bone side 8 which is to adjoin the bone of the jaw 1 and an opposite free side 9. The bone anchor 2 is individually designed for each patient, ensuring that the bone side 8 of the anchor plate 3 fits snugly against the bone of the patient's jaw. Not only does this allow the bone anchor to be firmly anchored to the jaw, but it also has the advantage of positioning the bone anchor on the bone of the jaw more precisely and is simplified for the surgeon. BE2018 / 0124 In order to drill holes for said screws in a correct position and according to a correct orientation in the bone of the jaw 1, a corresponding drilling template is designed and manufactured for the bone anchor 2. The drilling template 10 for the bone anchor 2 of Figures 4 and 5 is shown in Figures 6 and 7. This drilling template 10 has recesses 11 whose mutual position corresponds to the mutual position of said openings 4 in the bone anchor 2. In addition, this drilling template 10 from figures 6 and 7 has at least on the bone side 8 'thereof the same shape and dimensions as the bone anchor 2. Thus, this bone side 8' of the drilling template 10 also fits snugly on the bone of the jaw 1. This allows to position the jig on the jaw with high accuracy, this jig 10 assuming substantially the same position as the planned position for the bone anchor 2. Moreover, this offers the important advantage that the drilling template 10 takes up almost as much space as the bone anchor 2 to be placed. This drilling template 10 further has a connecting element 6 'similar to that of the bone anchor 2 and a reference member 5' corresponding to the fixing member 5 of the bone anchor 2. Thus, the presence of the connecting element 6 'and the reference member 5' bear extends into the oral cavity, contributing to a correct positioning of the drilling template 10 against the jaw. In order to allow to guide a drill, the drilling jig 10, adjacent to each of said recesses 11, has a drill guide 12. These drill guides 12 include a cylindrical recess through which a drill can be suitably guided to drill holes in the jaw 1. To design such a bone anchor, a three-dimensional digital model or a three-dimensional image of the jaw where the bone anchor is to be placed is generated. Such a model or image is obtained, for example, by performing a CT scan. Figure 1 schematically shows such an image of an upper jaw 1. For the design of the bone anchor 2, based on this three-dimensional image, a position and orientation for each of the screws with which the bone anchor is to be attached to the jaw is selected. This position and orientation is chosen in function of the structure and the density of the bone BE2018 / 0124 of the jaw 1, whereby one chooses to place the screws in solid bone with a high density without, for example, touching nerve pathways. Thus, based on this choice of position and orientation for the screws to be placed, a borehole for these screws is defined with a borehole shaft 14, as shown schematically in Figure 2. Based on this three-dimensional digital image and the chosen position and orientation for said screws, a digital model for the bone anchor 2 is designed. Figure 2 thus shows a model for the bone anchor 2. Hereby, for each of said screws, an opening 4 in the anchor plate 3 of the model is provided with a shaft which coincides with said borehole shaft 14 in order to allow the anchor plate 3 to be fastened through said opening 4 with said screws to the bone of the jaw 1 so that the bone side 8 thereof abuts the surface of the bone. The screws thus extend into the bone according to the selected position and orientation. In addition, a connecting element 6 with the fastening member 5 is also provided on the model of the bone anchor 2 so that the fastening member 5 is located in the oral cavity when the anchor plate 3 is fastened to the bone of the jaw. The bone anchor 2 model generated in this way can then be fed into a machine for additive manufacturing of the bone anchor 2 itself, for example by selective laser melting. As shown schematically in figure 3, a digital model of the drilling template 10 associated with the bone anchor 2 is designed by, starting from the model of the bone anchor 2, a drill guide 12 for each of the openings 4 provided on the model of the bone anchor 2. to the model. This drill guide 12 is provided with a cylindrical recess 13 with a central axis for guiding a drill or a milling cutter. The borehole shaft 14 for each of the screws coincides with the central axis of the corresponding cylindrical recess 13. After designing the model of the drilling template 10, this can be produced in the same way as the bone anchor 2. The invention thus has the advantage that a relatively compact drilling jig 10 is obtained which takes up a negligible amount of extra space relative to the bone anchor 2, so that the placement of the drilling jig in the limited space BE2018 / 0124 of the oral cavity against the jaw is no more complex than the placement of the bone anchor itself. In addition, the design of the drilling template requires virtually no additional effort or cost beyond that of the design of the bone anchor itself. Also the production itself of the drilling template 10 and the bone anchor 2 can be done simultaneously by means of an additive manufacturing technique. In order to limit design and / or production costs, the bone anchor 2 and the drilling template 10 are preferably manufactured from the same material, such as, for example, titanium, and this preferably by the same production technique. According to an interesting embodiment of the invention, the cylindrical recesses 13 in the drilling jig 10 are provided with a stop for a drill to allow to drill holes in said bone with a predetermined depth. This stop is formed, for example, by the flat end 15 of the drill guides 12. According to an alternative embodiment of the bone anchor 2, according to the invention, it is manufactured from the drilling jig 10. More specifically, said drilling guides 12 are removed from the drilling jig 10 to obtain the bone anchor 2. Preferably, the free side 9 of the bone anchor 2 has conical recessions 16 opening onto said openings 4. The dimensions of these conical recessions 16 are chosen such that, when the bone anchor 2 is fastened to the bone of the jaw, heads of the screws at least partially, preferably completely, countersink in these recessions 16 relative to the free surface 9 of the anchor plate 3. According to an interesting embodiment of the drilling jig 10, according to the invention, it exhibits the same recessions 16 as the bone anchor 2, the heads of the screws to be fully countersunk in these recessions 16 when attaching the bone anchor 2. The recessions 16 of the bone anchor therefore has a free part which is located above the screw head and which connects to the free side 9 of the anchor plate 3. At the drilling template 10, the drilling guide 13 is attached to this corresponding free part. Thus, after the drilling guides 13 have been removed from the drilling jig 10, they can be used as a bone anchor. Thus, any burrs or unevenness resulting from the removal of the drill guides are contained in the conical recessions 16 so that they are not disturbing. BE2018 / 0124 Figures 8 to 14 show a lower jaw 17 and a bone anchor 2 and a drilling jig 10 for a lower jaw 17. This bone anchor and this jig are similar to those for the upper jaw of Figures 1 to 7 except that they are specifically designed and modified for the proposed lower jaw 17. The invention is of course not limited to the embodiments of the bone anchor and the associated drilling jig or the method for manufacturing these, which are presented above and which are presented in the accompanying figures. Several alternatives can be considered within the scope of the invention.
权利要求:
Claims (14) [1] Conclusions 1. Set with a bone anchor (2) for an upper or lower jaw (1.17) and a corresponding drilling jig (10) for drilling holes in the jaw (1.17) for screw mounting the bone anchor (2 ) against the bone of the jaw (1,17), this bone anchor (2) containing an anchor plate (3) provided with openings (4) for said screws, an attachment member (5) for mounting aids, an elongated connecting element ( 6) that extends between the fastener (5) and the anchor plate (3) and is rigidly connected to the latter, while this connecting element (6) should extend through gingiva or mucosa into the oral cavity so that the fastener (5) is located in the oral cavity, the anchor plate (3) having a bone side (8) to abut against said bone of the jaw (1,17) and an opposite free side (9), while said jig (10) recesses (11) whose mutual position corresponds to the mutual position of said openings (4) in the bone anchor (2), characterized in that said drilling template (10) contains an anchor plate (3 ') whose shape and dimensions are substantially the same as those of at least the bone side (8) of the anchor plate ( 3) of the bone anchor (2), the drilling template (10) having a connecting element (6 ') rigidly connected to the anchor plate (3'), the shape and dimensions of which are substantially the same as those of the connecting element (6) of the bone anchor (2), in which connection to each of said recesses (11) a drilling guide (12) is provided on the drilling jig (10) which allows to guide a drill appropriately in order to drill holes in the jaw (1,17) bring. [2] Set according to claim 1, wherein said connecting element (6 ') of the drilling template (10) has the same orientation and position with respect to the anchor plate (3') of the drilling template (10) as the connecting element (6) of the bone anchor ( 2) to the anchor plate (3) of the drilling template (2). [3] Set according to claim 1 or 2, wherein one end of the connecting element (6 ') of the drilling template (10), which is opposite the end connected to the anchor plate (3') of the drilling template (10), is a reference member ( 5 ') whose shape and dimensions correspond substantially to that of said fastener (5), the relative position of the reference member BE2018 / 0124 (5 ') with respect to the anchor plate (3') of the drilling template (10) corresponds to the relative position of the fastening member (5) with respect to the anchor plate (3) of the bone anchor (2). [4] Set according to any one of claims 1 to 3, wherein said free side (9) of the bone anchor (2) has conical recessions (16) opening onto said openings (4) such that, when attaching the bone anchor (2) ) against said bone, heads of said screws at least partially in these recessions (16) can be countersunk relative to the free surface (9) of the anchor plate (3). [5] Set according to any one of claims 1 to 4, wherein said recesses (11) of the drilling template (10) have a circular cross section and said drill guide (12) has a cylindrical recess (13) for guiding a drill, the central axis of said recesses (11) coincides with the central axis (13) of said cylindrical recesses. [6] Set according to claim 5, wherein said cylindrical recess (13) in the drilling jig (10) has a stop (15) for a drill to allow a bore to be drilled in said bone with a predetermined depth. [7] The kit according to any of claims 1 to 5, wherein said drill guides (12) are removable from said drilling jig (10) to convert the latter into said bone anchor (2). [8] 8. Method for manufacturing at least a bone anchor (2) and a corresponding drilling jig (10) for an upper or lower jaw (1,17), the bone anchor (2) having an anchor plate (3) which is secured with one or more screws to be attached to the surface of the bone of the respective jaw (1,17), the anchor plate (3) having a bone side (8) to adhere to the surface of the bone and a free side (9) opposite to said bone side (8), said bone anchor (2) further having an elongated connecting element (6) extending between a fastener (5) and the anchor plate (3) and rigidly connected to the latter, while this connecting element ( 6) extends through gingiva or mucosa into the oral cavity so that the fastener (5) is located in the oral cavity, according to this method, designing a model of the bone anchor (2) from a three-dimensional digital model of the bone of the BE2018 / 0124 jaw (1,17) and on the basis of this model of the jaw (1,17) a position and orientation for each of said one or more screws is chosen in function of the structure and the density of the bone, whereby thus a borehole with a borehole shaft (14) is defined for said screws and corresponding openings (4) for these screws are provided in the bone anchor model (2), characterized in that said drilling template (10) is designed starting from the model of said bone anchor (2) so that the drilling template contains an anchor plate (3 ') whose shape and dimensions are substantially the same as those of at least the bone side (8) of the anchor plate (3) of the bone anchor (2) and so that it connecting element (6 ') which is rigidly connected to the anchor plate (3') and whose shape and dimensions are substantially the same as those of the connecting element (6) of the bone anchor (2), to which drilling guides (12) are added which cylindrical recess (13) with a central axis coinciding with said borehole shaft (14) for guiding a drill. [9] The method of claim 8, wherein - a three-dimensional digital image of the bone of the jaw (1,17) is generated; - on the basis of this three-dimensional image, a position and orientation for each of said one or more screws is chosen in function of the structure and the density of the bone, thus defining a borehole with a borehole axis (14) for said screws relative to relative to said bone; - based on said three-dimensional digital image and the selected position and orientation for said one or more screws, a digital model for the bone anchor (2) is designed, wherein for each of said screws, an opening (4) in the anchor plate (3) this model is provided with a shaft that coincides with said borehole shaft (14) to allow the anchor plate (3) to be secured to said bone through said opening (4) with said screws so that the bone side (8) of it connects to the surface of the bone, said screws extending into the bone according to the selected position and orientation, - said connecting element (6) with the fastening member (5) is provided on the model of the bone anchor (2) so that the fastening member (5) is in the BE2018 / 0124 oral cavity is located when the anchor plate (3) is attached to the bone of the jaw (1,17), whereby a digital model of said drilling template (10) is designed by, starting from the model of the bone anchor (2), for each of said apertures (4) provided on the bone anchor model (2) add a drill guide (12) to the model, this drill guide (12) including a cylindrical recess (13) with a central axis for guiding of a drill or a mill, said bore axis (14) for each of the screws coinciding with said central axis of the corresponding cylindrical recess (13), wherein, after design, the model of the drilling template (10) and the model for the bone anchor (2), these are produced from these models. [10] The method of claim 8 or 9, wherein said cylindrical recesses (13) in the drilling jig (10) are provided with a drill stop (15) to allow drilling holes in said bone with a predetermined depth. [11] The method of any one of claims 8 to 10, wherein a cone beam CT scan is performed from said jaw (1.17) to generate said three-dimensional digital image or model of the bone of the jaw (1.17). [12] The method of any one of claims 8 to 11, wherein said bone anchor (2) is manufactured by an additive manufacturing technique starting from said model of the bone anchor (2). [13] The method of any one of claims 8 to 11, wherein said drilling template (10) is manufactured by an additive manufacturing technique starting from said model of the drilling template (10). [14] The method of claim 13, wherein said bone anchor (2) is manufactured by removing said drill guides (13) from the drilling jig (10).
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同族专利:
公开号 | 公开日 BR112021006734A2|2021-07-13| EP3863553A1|2021-08-18| BE1026696A9|2020-05-14| WO2020075065A1|2020-04-16| US20210378787A1|2021-12-09| BE1026696A1|2020-05-06|
引用文献:
公开号 | 申请日 | 公开日 | 申请人 | 专利标题 WO2002091942A1|2001-05-16|2002-11-21|Adriano Guidi|Device for controlling the dispensing of wax for the creation of tracings and moulds in dentistry| WO2016034973A1|2014-09-02|2016-03-10|Maino Dott. Bortolo Giuliano|Surgical template for dental and/or orthodontic implants and method for designing a surgical template| WO2016181286A1|2015-05-08|2016-11-17|Tita-Link B.V.B.A.|Bone anchor with a drilling template connecting to this bone anchor and method for manufacturing the bone anchor and the drilling template|
法律状态:
2020-08-03| FG| Patent granted|Effective date: 20200513 |
优先权:
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申请号 | 申请日 | 专利标题 BE20180124A|BE1026696A9|2018-10-08|2018-10-08|Bone anchor for an upper or lower jaw with a corresponding drilling jig|BE20180124A| BE1026696A9|2018-10-08|2018-10-08|Bone anchor for an upper or lower jaw with a corresponding drilling jig| EP19798719.1A| EP3863553A1|2018-10-08|2019-10-08|Bone anchor for an upper or lower jaw with a corresponding drilling template| US17/283,788| US20210378787A1|2018-10-08|2019-10-08|Bone anchor for an upper or lower jaw with a corresponding drilling template| PCT/IB2019/058555| WO2020075065A1|2018-10-08|2019-10-08|Bone anchor for an upper or lower jaw with a corresponding drilling template| BR112021006734-5A| BR112021006734A2|2018-10-08|2019-10-08|assembly with a bone anchor for an upper or lower jaw and a corresponding drilling template for making holes in the jaw, and method for making at least one bone anchor and a corresponding drilling template for an upper or lower jaw| 相关专利
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