Dental surgery step guide device

Abstract

The invention relates to a dental surgery step guide device (1), comprising a lower base (2) provided with a front face (20) provided with wells (21) for drilling and securing said base (2) and a removable part bearing on said base (2), as well as means (6) for locking said removable part in fitting onto said base (2) provided with a locking member provided with a lower ring (7) secured to said base (2) with a lower orifice (70), as well as an upper ring (8) secured to said removable part with an upper orifice (80), and also a key (9) shaped to be inserted through said upper orifice (80) within said lower orifice (70) in an axial direction; said key (9) comprising a lower lug (95) projecting laterally; said lower ring (7) comprising a lower groove (73) shaped complementary to said lower lug (95). Figure for the abstract: Fig.1.

Description

Title of the invention: Dental surgery step guide device Technical field of the invention

[0001] The present invention falls within the medical field of dental surgery.

[0002] As is known, a dental surgeon or "dentist" performs endodontic procedures for the treatment of teeth, but also extractions, as well as implantology of dental prostheses, to replace extracted teeth, and also in the case of partial or total edentulism.

[0003] In this context, the implantation of dental prostheses is carried out by means of a dental surgery guide device. Such a guide allows the practitioner to correctly implant and fix each dental prosthesis during surgery.

[0004] To do this, such a guide device is configured to cover and rest on the dentition to be operated on, then is secured to the dentition or trans-fixed in the bony parts when there are no more teeth. In particular, on the front face of the guide device, wells are provided, in the form of sleeves, serving as a guide for drilling the bone through the gum, with a view to introducing screws, which will hold the guide device throughout the surgery.

[0005] It will be noted that such a guide device is made to measure for the dentition to be treated, by molding or by medical imaging, then a manufacturing step, in particular by injection or computer-assisted three-dimensional printing known as “3D printing”. State of the art

[0006] A known guide device is called "stepped" and comprises a base, intended to rest on the dentition or trans-fixed, securing it with the jaw, as well as a removable part, intended to rest on said base and be secured with the latter. Said removable part has two types, used successively during the surgical operation.

[0007] A first removable part is a dental support positioning guide, used to correctly position the base on the dentition or the jaw. Such a positioning guide corresponds to a molding of the dentition and, once secured to the base, allows the guide device to be fitted onto the dentition or the jaw. In place, the base can then be secured or trans-fixed. The positioning guide is then detached from the base and replaced by another removable part, dedicated to the implant surgery to be performed.

[0008] This second type of removable part, called “surgical guide” or “surgical guide” implant surgery”, is provided with a sleeve positioned opposite the implant to be positioned within the dentition and allowing drilling in the jaw, as well as the implantation of the dental prosthesis. Once the insertion holes for the implants have been made, the surgical guide is removed.

[0009] Then, the base is removed or preferably remains in place during the implantation of the dental prostheses, to facilitate the introduction of said prostheses. Finally, the base is removed, in particular by cutting it or breaking it.

[0010] Further on, each removable part is held in position on the base by interlocking, for example by means of complementary male / female parts arranged in alignment on the base and on the removable part, or even by magnetization between them.

[0011] Another solution consists of locking means in the form of upper and lower orifices, arranged in mutual alignment through the removable part and the base. These orifices are intended to cooperate by inserting a fixing key.

[0012] In particular, the insertion of the key into the orifices is carried out by force, in particular by notching grooves provided on the periphery of said key with complementary grooves hollowed out in the wall of the orifices.

[0013] Furthermore, in order to facilitate the insertion and notching of the key, it may comprise a generally conical or truncated conical shape, while the sections of the orifices are provided to converge in the direction of insertion.

[0014] Such a keyed attachment has several drawbacks, making the attachment precarious. Poor alignment of one of the keys is likely to modify the position of the removable part on the base, in particular by applying the force required for inserting the keys into the holes. Similarly, a poorly inserted key does not ensure the hold between the base and the removable part, so that it is not uncommon for the latter to become detached during surgery.

[0015] Furthermore, in the case of the implantation of several dental prostheses, the step guide may comprise several removable parts, corresponding according to the implants to be positioned. It is therefore necessary to replace the removable part with another during the surgery. In this case, the forced insertion, especially by notching, complicates the task of the practitioner to remove each key.

[0016] In addition, the complementary grooves of the orifices are liable to deteriorate, making the fixing of the other removable part on the same base even more precarious. Presentation of the invention

[0017] The invention aims to overcome the drawbacks of the state of the art by proposing a stage guide device for dental surgery with a locking improved of each removable part on the base, by means of a rotational locking of one or more keys within holes. In particular, once turned, each key is blocked in its axial direction of insertion and fully ensures the support of said removable part on the base.

[0018] To remove the removable part, it is sufficient to turn the key, in particular in the opposite direction, until it is again allowed to move freely in said axial direction and to be extracted from the corresponding orifice.

[0019] To do this, the dental surgery step guide device, shaped to cooperate in support and fixation on a dentition to be treated, comprises - a lower base provided with a front face provided with drilling wells and securing said base; - at least one removable part, shaped additionally to rest on said base; - said base comprising interlocking means and said removable part comprising complementary interlocking means; - means for locking said removable part into position on said base. Such a guide device is characterized in that said locking means comprise at least one locking member provided - a lower ring secured to said base, a lower orifice being provided within said lower ring; - at least one upper ring secured to said removable part, an upper orifice being provided passing through said upper ring; the lower hole being aligned with the upper hole by fitting the removable part onto the base; - at least one key having a body surmounted by a head, said body being generally cylindrical and complementary shaped to cooperate and come into the insertion position through said upper orifice within said lower orifice in an axial direction.

[0020] Such a guide device is also characterized in that - said key comprises at least one lower lug projecting laterally; - said lower ring comprises a lower groove shaped complementary to said lower lug; - from the insertion position of said key, said lower lug is rotatable along said lower groove to a locking position of said upper ring on said lower ring, and vice versa; - in the locking position, said lower lug is blocked within said groove lower in said axial direction.

[0021] According to additional, non-limiting characteristics, - the upper orifice comprises an upper recess arranged in the axial direction and provided to pass through, said upper recess being shaped complementary to at least said lower lug; - the lower orifice comprises a lower recess formed in the axial direction and shaped complementary to at least said lower lug; allowing the insertion of said key in said axial direction through said upper ring within said lower ring.

[0022] According to one embodiment, said key comprises - an upper lug projecting laterally and aligned with said lower lug; - said upper ring comprises an upper groove shaped complementary to said upper lug; - from the insertion position of said key to the locking position, and vice versa, said upper lug is locked within said upper groove in said axial direction.

[0023] According to one embodiment, at least said lower groove extends angularly around said lower orifice, preferably at an angle of at least 30°, preferably at an angle of approximately 90°.

[0024] According to one embodiment, the axial direction of insertion of said key is oriented relative to the vertical.

[0025] According to one embodiment, said lower ring and said upper ring are oriented according to a determined angular position in a median plane of said guide device and orthogonal to said axial direction.

[0026] According to one embodiment, at least said lower ring comprises an oblong shape having an offset attachment zone on said base.

[0027] According to one embodiment, said lower orifice has a bottom pierced with a hole for extracting said key.

[0028] According to one embodiment, said head is provided with gripping means in the form of at least one bore, preferably two bores provided through.

[0029] According to one embodiment, said gripping means comprise at least two flares arranged opposite each other in the upper part of said body.

[0030] According to one embodiment, said body comprises a distal end provided with a chamfer.

[0031] According to one embodiment, said key comprises between the body and the head a locking means by pressing on the upper ring, preferably in the form of a disc extending transversely relative to said body.

[0032] According to one embodiment, said locking means comprise - at least two locking members distributed around said guide device, preferably in opposition on either side of said guide device.

[0033] According to one embodiment, said locking means comprise - three locking members distributed frontally and on each side of said guide device.

[0034] Thus, such a step guide device makes it possible to ensure that the removable part is held on the base and that it can be replaced safely and repeatedly during surgery if necessary.

[0035] Furthermore, the orientation of the key makes it possible in particular to visually check the locking of the elements between them. Presentation of the drawings

[0036] Other characteristics and advantages of the invention will emerge from the detailed description which follows of the non-limiting embodiments of the invention, with reference to the appended figures, in which:

[0037] [Fig.l] schematically represents an exploded perspective view of an embodiment of the guide device, showing in particular the base intended to receive in nesting removable parts of the dental support positioning guide type and of the implant surgery guide type, highlighting the locking of the positioning guide on said base by means of three keys;

[0038] [Fig.2] schematically represents a front view of an embodiment of a dental surgery step guide device, showing in particular a base intended to rest and be fixed on a jaw, with a removable part of the positioning guide type attached to cover said base;

[0039] [Fig.3] schematically represents a top view of the embodiment of the [Fig.l], showing in particular two locking members on either side of said guide device, intended to receive keys, and highlighting an angular inclination relative to the horizontal of said two locking members;

[0040] [Fig.4] schematically represents a side view of another embodiment of the guide device, in the position of support of the removable part on the base, highlighting locking housings with angular inclinations relative to the vertical;

[0041] [Fig.5] schematically represents a perspective view of an embodiment of a key provided with a single locking lug, showing in particular a locking means in the form of a disc between the body and the head;

[0042] [Fig.6] schematically represents a perspective view of another mode of realization of a key provided with two locking lugs, showing in particular one of the flares and orifices intended for gripping said key;

[0043] [Fig.7] schematically represents a perspective view of an embodiment of a lower ring, of hollow cylindrical shape, showing in particular a lower blind introduction channel and opening onto a lower internal groove;

[0044] [Fig.8] schematically represents a view along a vertical median section of the [Fig.7], showing in particular the beveled section of said lower internal groove;

[0045] [Fig.9] schematically represents a perspective view of an embodiment of an upper ring, showing in particular an upper channel passing through and opening into an upper internal groove;

[0046] [Fig. 10] schematically represents a view along a vertical median section of [Fig.9], showing in particular the upper channel communicating with the upper face and the lower face of said upper ring, as well as the section of said upper internal groove;

[0047] [Fig. 11] schematically represents a view along a horizontal median section of [Fig.9], showing in particular the upper internal groove extending over half of said upper ring;

[0048] [Fig. 12] schematically represents a perspective view of another embodiment of a key and the lower and upper rings, of oblong shape, showing in particular the support of the upper ring on the lower ring, then the vertical insertion of the key through the upper and lower channels, before its locking by rotation;

[0049] [Fig. 13] schematically represents a view along a vertical median section of a key in the insertion position within an upper ring and a lower ring, in the support position, showing in particular the freedom of vertical movement of said key; and

[0050] [Fig. 14] schematically represents a view similar to [Fig. 13] in the locking position of said key within the upper ring and the lower ring, showing in particular the cooperation of the lugs in vertical abutment within the lower and upper internal grooves. Detailed description

[0051] The present invention relates to a guide device 1 for dental surgery.

[0052] Such a guide device 1 is shaped to cooperate in support and fixing on a dentition to be treated. In other words, during a preliminary step, a practitioner makes said device 1 custom-made with regard to the dentition to be treated, by molding or by medical imaging, then a manufacturing step, in particular by injection or three-dimensional printing, or by machining, in a computer-assisted manner known as “3D printing”. The resulting guide device 1 is therefore perfectly conformed to the morphology of each patient to be treated.

[0053] This preliminary step can be reproduced for each patient, for each dentition, lower or upper, to be treated.

[0054] It will be noted that, according to the examples of embodiments shown, the guide device 1 is envisaged for the treatment of a lower dentition. The terms lower and upper are then understood with regard to the direction from said lower jaw, from the bottom to the top. Naturally, the guide device 1 is suitable for the treatment of the upper jaw, by reversing the direction and the corresponding terms.

[0055] Advantageously, said guide device 1 is provided in stages, namely that it has several distinct and removable parts which are attached to each other during the dental surgery operation. In particular, the different parts are superimposed and fit together, and are secured to each other in the fitting position, in particular through a removable attachment.

[0056] Further, according to the invention, the guide device 1 firstly comprises a base 2.

[0057] Such a base 2 is located inferiorly during an intervention on the lower jaw. Conversely, it can be positioned superiorly for an intervention targeting the upper jaw.

[0058] Said base 2 is provided with a front or vestibular face 20 comprising wells 21 for drilling and securing said base 2. These wells 21 are arranged through said front face 20 of the base 2, opening out on either side.

[0059] Such wells 21 generally have a cylindrical and tubular shape. The wells 21 may be formed in the thickness of said base 2 or protrude relative to said front face 20, so as to form a tube of a length adapted to facilitate the introduction of the tool by the practitioner, such as a drill, and to ensure its guidance along each of said wells 21, namely along the longitudinal median axis of each of said wells 21.

[0060] Once the drilling has been carried out, the wells 21 can receive suitable fixing means, such as screws called “pins”, which cooperate within the previously carried out drillings. Once in place, the screws ensure the fixing and maintenance of said base 2 on the jaw.

[0061] It will be noted that the internal periphery of each of the wells 21 may incorporate a metal tube, providing rigidity and strength suitable for the drilling operation. Such a metal tube may be incorporated within the wells 21 during the manufacturing step of said guide device 1, at the time of molding, machining, or 3D printing.

[0062] Furthermore, the number and positioning of the wells 21 relative to said base 2 are determined based on certain characteristics related to the surgical operation, such as the patient's morphology or the number of implants.

[0063] From then on, the base 2 serves as a base, which is fixed on the jaw, and allows other parts of said guide device 1 to be received from above, in overlapping fashion.

[0064] Thus, the guide device 1 also comprises at least one part, shaped complementary to bear on said base 2. Such a part is designed to be removable, namely that it can be positioned and fixed temporarily on the base 2, then replaced during the surgical operation.

[0065] In this respect, as mentioned previously, this removable part can be of different types, preferably of two distinct types, sometimes of three different types.

[0066] A first type of removable part comprises a dental support positioning guide 3. Such a guide 3 is used to correctly position the base 2 on the dentition or the jaw. To do this, the positioning guide 3 corresponds to a molding of the dentition, in particular of the upper or coronal part, like a molding of the teeth. In addition, the base 2 corresponds to a molding of the lower part of the dentition. The upper face of the base 2 then corresponds to the lower face of the positioning guide 3, allowing them to come into contact with each other, to form the molding of the two lower and upper parts of the dentition.

[0067] Thus, once secured to the base 2, the positioning guide 3 allows the guide device 1 to be fitted onto the teeth or jaw. In place, the base 2 can then be secured or trans-fixed, as mentioned above, in particular through the step of drilling via the wells 21 and fixing the screws. The positioning guide 3 can then be detached from the base 2 and replaced by another removable part, of another type, dedicated to the implant surgery to be performed.

[0068] In this respect, a second type of removable part, called a “surgery guide 4”, is used for implant surgery and comprises at least one implantology sleeve 40 of a dental prosthesis, preferably several. Such a sleeve 40 functions in a similar manner to the wells 21, allowing the practitioner's tool to be guided during the procedure, in particular to create the cavities in the jaw that will receive the future implants. Similarly, the sleeve 40 may be in the form of a metal insert, generally in the shape of a flattened tube, incorporated during the manufacture of this removable part.

[0069] Furthermore, as for the positioning guide 3, the surgical guide 4 comprises a lower face coming into contact with the upper face of said base 2.

[0070] Thus, during the surgical operation, the guide device 1 is placed on the dentition with its base 2 surmounted by the positioning guide 3, then the base 2 is fixed. Said positioning guide 3 is then removed, to position the guide 4 chi surgical, with each of the sockets 40 positioned opposite the dental prosthesis to be implanted within the dentition, thus allowing drilling in the jaw. The surgical guide 4 can then be removed (as well as possibly the base 2), in order to carry out the implantation of the corresponding dental prostheses.

[0071] It will be noted that the base 2 can be kept in place during implantation, to facilitate the introduction of said prostheses, then extracted at the end of the operation, in particular by cutting it or breaking it.

[0072] In this respect, a third type of removable part is called a “temporary stage” and serves as a support for one or more temporary teeth, constituting the patient’s new dentition. Such a temporary stage cooperates with the base 2, in the same way as the other types of removable parts. Once secured in the mouth, the attachments with the base 2 will be cut, in order to extract said base 2.

[0073] Other types of removable part can be envisaged, corresponding to an intermediate or additional dental surgery step and which cooperates on the base 2, in the same way as the other types of removable parts.

[0074] [Fig.l] shows two removable parts in the form of a positioning guide 3 and a surgical guide 4, which can be interchanged and mounted on the base 2. In this example, the surgical guide 4 comprises six sockets 40.

[0075] Further on, each removable part is made integral on the base 2 by fitting and locking.

[0076] On the one hand, said base 2 comprises interlocking means 5 and said removable part comprises complementary interlocking means 50. In other words, the means 5, 50 are shaped and dimensioned to cooperate in interlocking with each other. Furthermore, this interlocking is provided in a vertical or substantially vertical direction, from top to bottom, until the removable part comes into contact and bears on the base 2. Furthermore, in the interlocking position, the base 2 and the removable part are secured, limiting their freedom of movement relative to each other, in particular preventing lateral displacements, in a horizontal or substantially horizontal direction. Thus, in the interlocking position, the means 5, 50 only allow vertical displacement of the removable part relative to the base 2, from bottom to top.

[0077] According to one embodiment, as shown in Figures 1 to 4, the interlocking means 5, 50 comprise interlocking members, operating in pairs, with a lower part of the interlocking means 5 arranged on the base 2 and an upper part of the complementary interlocking means 50 arranged on the removable part.

[0078] In addition, each pair of interlocking members comprises a housing 51, intended to internally receive a removable pin 52, or a pair of magnets so- lines of each of said housings 51.

[0079] According to the exemplary embodiment shown in [Fig. 1], said pin 52 generally has a cylindrical shape.

[0080] According to one embodiment, the pin 52 extends in projection from the base 2 or from the removable part, to cooperate within a corresponding housing 51, in the manner of a male part inserted within a female part.

[0081] According to another embodiment, the pin 52 can be removable, being inserted into two housings 51 each provided on the base 2 and on the removable part.

[0082] Furthermore, such a pin 52 may have a height less than or equal to (or even greater in the removable case) the depth of the housings 51, in the form of blind holes, projecting to ensure fitting by being introduced into each of them.

[0083] It will be noted that the pin 52 has dimensions that are complementary to the housings 51, with the clearance allowing its introduction and extraction. Furthermore, the introduction and extraction of the pin 52 can be done in an adjusted manner within the housings 51, by penetrating with force, in order to ensure sufficient friction between the periphery of the pin 52 and the internal wall of the housings 51, to prevent the base 2 and the removable part from becoming separated during handling.

[0084] According to another embodiment, the nesting means 5, 50 may comprise centering lugs, of any shape, preferably in the form of a truncated cone, extending from the base 2 or from the lower face of the removable part, to cooperate respectively by insertion within a housing 51 provided on the lower face of the removable part or on the upper face of said base 2. In addition, the housings 51 may have an inclined wall which cooperates to perfectly center the parts between them when inserting the cones within the housings 51.

[0085] Furthermore, each pair of interlocking members may have different dimensions, in particular pairs of members of small dimensions and pairs of members of larger dimensions. The members of larger dimensions make it possible to engage the interlocking, while the members of smaller dimensions make it possible to refine and finalize the interlocking of the removable part on the base 2.

[0086] It will also be noted that one of the housings 51 located lowermost is integral with the base 2, while the other of the housings 51 is integral in the corresponding case with the positioning guide 3 and the surgical guide 4, or even with the temporary stage. These two housings 51 located uppermost are similar, namely that they have identical dimensions, positions and orientations to ensure the positioning opposite or in alignment of said housings 51, in order to introduce said pin 52 (or the magnets) therein, when the corresponding removable part is added for its fitting.

[0087] Thus, once the base 2 and the removable part are fitted together, it is possible to manipulate the guide device 1 thus formed, for example to place the base 2 and the positioning guide 3 on the dentition to be treated. Similarly, once the base 2 is fixed to the dentition, it is possible to remove the positioning guide 3, to fit the surgical guide 4.

[0088] On the other hand, the guide device 1 comprises means 6 for locking said removable part in fitting onto said base 2. In other words, once the removable part is fitted onto the base 2, the two can be blocked together, temporarily. In short, the locking limits the degree of freedom of movement in the vertical or substantially vertical direction allowing the fitting between the base 2 and the removable part.

[0089] According to one embodiment, the locking means 6 can replace the interlocking means 5, 50, or can be included within the interlocking means 5, 50.

[0090] Advantageously, said locking means 6 comprise at least one locking member, preferably several, distributed around the guide device 1, on the side of the frontal or vestibular face, on the opposite side towards the inside or lingual or palatal, on the right side and / or on the left side.

[0091] According to one embodiment, said locking means 6 comprise at least two locking members distributed around said guide device 1, preferably in opposition on either side of said guide device 1.

[0092] According to a preferred embodiment, as visible in Figures 1 to 4, said locking means 6 comprise three locking members distributed frontally and on each side of said guide device 1.

[0093] Said locking member is provided with several elements intended to cooperate with each other through a mechanical assembly, in particular by keying, namely that two of the elements are fixed and made integral with each other by a third element, namely a key 9.

[0094] More precisely, each member of the locking means 6 comprises a lower ring 7 secured to said base 2.

[0095] Said lower ring 7 can have any geometric shape, with straight or rounded edges.

[0096] According to a preferred embodiment, as visible in Figures 1 to 4, at least said lower ring 7 comprises an oblong shape having an offset attachment zone on said base 2.

[0097] In addition, a lower orifice 70 is provided within said lower ring 7. Said lower orifice 70 has a round or circular section.

[0098] Such a lower orifice 70 may be provided as a through orifice, but preferably as a blind orifice, namely that it has a bottom 71. This bottom 71 can then serve as a stop when inserting the element provided to ensure keying (i.e. via said key 9).

[0099] According to one embodiment, said lower orifice 71 has a bottom 71 pierced with a hole 72 for extracting said key 9. This hole 72 makes it possible to introduce the end of a jaw of a specific clamp, in order to push said key 9 from below, when it is introduced into the lower orifice 70.

[0100] Each member of the locking means 6 also comprises at least one upper ring 8 secured to said removable part.

[0101] Depending on the type of the removable part, an upper ring 8 is therefore mounted on the positioning guide 3 and another is mounted on the surgical guide 4, or even another on the temporary stage. These upper rings 8 of the same locking member are similar, namely that they have identical dimensions, positions and orientations to cooperate in coupling with the lower ring 7 equipping said base 2, when the removable part of the corresponding type is fitted in a nested manner on said base 2.

[0102] Said lower ring 7 can have any geometric shape, with straight or rounded edges.

[0103] According to the corresponding preferred embodiment, as visible in Figures 1 to 4, said upper ring also comprises an oblong shape, provided complementary to the oblong shape of said lower ring 7. In addition, this oblong shape of the upper ring 8 has an offset attachment zone on the corresponding removable part.

[0104] In addition, an upper orifice 80 is provided passing through said upper ring 8. Said upper orifice 80 has a round or circular section, with a diameter identical or substantially identical to the diameter of the lower ring 7.

[0105] Each member of the locking means 6 also comprises at least one key 9. This key 9 serves to ensure the holding and blocking of the rings 7, 8 between them, by cooperating by introduction within the orifices 70, 80, thus ensuring their keying.

[0106] As mentioned previously, this keying is possible because the lower orifice 70 is aligned with the upper orifice 80 when the removable part fits onto the base 2 (or at the time of fitting, the successive introduction of the keys 9 then makes it possible to center the removable part on the base 2, with a view to gradually obtaining an alignment of the orifices 70, 80, to ensure the desired fitting).

[0107] To do this, said key 9 is provided with a body 90 surmounted by a head 91.

[0108] Such a head 91 may have any geometric shape. According to a preferred embodiment, said head 91 generally has a rectangular parallelepiped shape, in particular with rounded corners and / or upper edges.

[0109] According to one embodiment, said head 91 is provided with gripping means in the form of at least one bore 93, preferably two bores 93 provided to pass through, or even three bores 93. Such bores 93 are internally dimensioned to allow the insertion of the ends of the jaws of a clamp, in particular a hemostatic type clamp, also called “Kocher”, preferably with said curved jaws or tips.

[0110] Figures 5 and 6 show an exemplary embodiment with a head 91 provided with two bores 93, while Figures 13 and 14 show an exemplary embodiment of a head 92 provided with three bores 93.

[0111] According to one embodiment, said gripping means comprise at least two flares 94 arranged opposite each other in the upper part of said body 90. Such flares 94 are therefore arranged in the upper part of the body 90, on either side of the head 91, preferably symmetrically. These flares 94 form cavities or notches facilitating the gripping of the key 9 on each side of the head 91, in particular by pinching.

[0112] The flares 94 can have any concave geometric shape, preferably a rounded shape.

[0113] [Fig.6] shows an exemplary embodiment showing one of the two flares 94 in the shape of an arc of a circle, formed in a hollow in the upper part of said body 90, under the head 91.

[0114] Said body 90 is generally cylindrical. It has an external diameter identical or substantially identical to the internal diameter of the orifices 70, 80, with the clearance allowing the key 9 to be inserted and extracted.

[0115] According to one embodiment, said body 90 comprises a distal end provided with a chamfer 92, namely that the peripheral edges of said lower end are inclined. Such a chamfer 92 makes it easier to insert the key 9 into the orifices 70, 80, as well as possibly centering them relative to each other.

[0116] In addition, said body 90 of the key 9 is shaped complementary to cooperate and come into the insertion position through said upper orifice 80 within said lower orifice 70 in an axial direction.

[0117] It will be noted that said axial direction extends parallel to the longitudinal median axis of the body of each key 9. This axial direction may correspond to the direction of the fitting, namely in a vertical or substantially vertical direction of the fitting, or in a direction inclined relative to said vertical direction, depending on the corresponding embodiment.

[0118] According to one embodiment, the axial direction of insertion of said key 9 is oriented relative to the vertical. In other words, the median axis of each key 9 has an angle relative to a horizontal or substantially horizontal plane. rhizontal, or with respect to the median plane of said guide device 1, in particular the plane extending along the contact surface of the base 2 and the removable part.

[0119] Such a vertical orientation of the rings 7, 8 is configured and produced during the manufacture of said guide device 1.

[0120] An example of orientation relative to the vertical is notably represented in [Fig.4], where the rings 7,8 located on the left have a greater angle of inclination than the rings 7,8 located on the right.

[0121] According to one embodiment, said lower ring 7 and said upper ring 8 are oriented according to a determined angular position in a median plane of said guide device 1 and orthogonal to said axial direction. In other words, the rings 7, 8 can be rotated in a horizontal or substantially horizontal plane, in order to adapt to the morphology of the patient and facilitate the fitting, but also the insertion and extraction of the key 9.

[0122] Such an angular orientation of the rings 7, 8 is configured and produced during the manufacture of said guide device 1.

[0123] An example of angular orientation in the median plane is notably represented in [Fig.3], where the rings 7,8 located on the left have a slightly greater angle in the median plane than the rings 7,8 located on the right.

[0124] According to one embodiment, said key 9 is made from a durable material of quality suitable for the dental field, preferably from a ceramic material, preferably of the technical ceramic type, such as a ceramic based on zirconium dioxide, commonly called “zirconia”, or from a metal-based material, such as surgical steel, titanium or a chrome-cobalt alloy. In addition, zirconia is sterilizable, allowing it to be reused from one surgery to another.

[0125] Advantageously, the locking of the removable part on the base 2 is achieved by the key 9, once inserted within said rings 7, 8. In other words, each key 9 cooperates mechanically within its member in order to ensure the locking of the rings 7, 8 between them.

[0126] To do this, said key 9 comprises at least one lower lug 95 projecting laterally. In particular, said lower lug 95 projects relative to the periphery of the body 90 of said key 9, forming a step or a tooth in the mechanical sense of the term.

[0127] According to a preferred embodiment, said lower lug 95 has a prism shape, with two inclined sides and a distal face parallel or substantially parallel to the periphery of said body 90.

[0128] In addition, said lower ring 7 comprises a lower groove 73. In short, the inner wall of the lower orifice 70 is hollowed out or forms a projection on a part of its periphery, constituting said lower groove 73. In addition, the rest of the periphery is free, allowing said lower lug 95 to pass, in particular during its insertion or extraction in the axial direction.

[0129] Said lower groove 73 is shaped complementary to said lower lug 95. In other words, the lower groove 73 has a profile or a section corresponding to the profile or to the section of the tooth formed by said lower lug 95.

[0130] Therefore, from the insertion position of said key 9 (i.e. in the axial direction), said lower lug 95 is rotatable along said lower groove 73 to a locking position of said upper ring 8 on said lower ring 7. Indeed, when the lower lug 95 cooperates by rotating within the lower groove 73, the head of the key 9 presses on the upper ring 8, locking the rings 7, 8 together. In other words, only the key 9 can rotate on itself, blocked by the rings 7, 8 according to any other freedom of movement, such as translations. Thus, in the locking position, said lower lug 95 is blocked within said lower groove 73 in said axial direction.

[0131] Conversely, from the locking position, in which the key 9 is turned so that the lower lug 95 is in an angular position within said lower groove 73, by applying a rotation of said key 9 until said lower lug 95 comes out of said lower groove 73, releasing the movement of the key 9 which can be extracted from the lower orifice 70 of said lower ring 7.

[0132] According to one embodiment, in particular in the case of a single lower lug 95 provided on the key 9, the latter comprises between the body 90 and the head 91 a means of locking by pressing on the upper ring 8, preferably in the form of a disc 96 extending transversely with respect to said body 90, namely with a radius extending orthogonally or substantially orthogonally with respect to the longitudinal axis of said body 90. Such a disc 96 makes it possible in particular to stiffen all of the nested and locked parts, in particular the rings 7, 8 gripped by the key 9.

[0133] [Fig.5] shows an example of a key 9 equipped with a locking disc 96, the lower face of which comes to bear against the upper face of the upper ring 8, in the insertion position, but especially in the locking position.

[0134] According to one embodiment, in order to allow the lower lug 95 to pass through the upper ring 8, the upper orifice 80 comprises an upper recess 81 arranged in the axial direction and provided to pass through. Such an upper recess 81 is shaped complementary to at least said lower lug 95.

[0135] Similarly, the lower orifice 70 comprises a lower recess 74 arranged in the axial direction and shaped complementary to at least said lower lug 95, allowing the insertion of said key 9 in said axial direction through said upper ring 8 within said lower ring 7.

[0136] It will be noted that the lower recess 74 is closed at the bottom by the bottom 71.

[0137] Figures 7 and 9 show examples of the recesses 74, 81.

[0138] According to one embodiment, the upper ring 8 is shaped in a similar manner to the lower ring 7.

[0139] For this purpose, said key 9 comprises an upper lug 97 projecting laterally and aligned with said lower lug 95.

[0140] It will be noted that the upper lug 97 can be offset relative to the lower lug 95, with corresponding offset recesses 74, 81, to allow the insertion of the key 9 in two stages, with successive rotations for its insertion through the upper ring 8 until it cooperates in locking within the lower ring 7 (and vice versa during its extraction).

[0141] In addition, said upper ring 8 comprises an upper groove 82 shaped complementary to said upper lug 97.

[0142] Therefore, like the lower lug 95, from the insertion position of said key 9 to the locking position, and vice versa, said upper lug 97 is blocked within said upper groove 82 in said axial direction. In other words, during rotation of the key 9, the lugs 95, 97 rotate within the corresponding grooves 73, 82, blocking the freedom of vertical movement or along the axis of said key 9.

[0143] Furthermore, in this configuration with two lugs 95,97 the clamped holding of the rings 7,8 is provided directly by said lugs 95,97 cooperating within the grooves 73,82.

[0144] A disk 96 may also be added in this embodiment.

[0145] According to one embodiment, at least said lower groove 73 extends angularly around said lower orifice 70, preferably at an angle of at least 30°, in particular up to 180° (i.e. in opposition from the lower recess 74), preferably at an angle of approximately 90°. Therefore, the lower groove 73 formed angularly only on one side of the lower ring 7, serves as a foolproof device, giving a direction of rotation to the key 9 for its locking and a reverse direction for its unlocking.

[0146] According to another embodiment, said lower groove 73 can also go all the way around the lower orifice 70.

[0147] According to one embodiment, said upper groove 82 also extends angularly around said upper orifice 80, at an angle identical to the angle of the lower groove 73, or at a different angle.

[0148] Furthermore, in the case of grooves 73, 82 extending at a determined angle, the upper groove 82 extends in the same direction (clockwise or counterclockwise) from the recess 81 than the lower groove 73 from the recess 74.

[0149] Thus, the guide device 1 according to the invention, equipped with key locking members, as previously described, makes it possible to save space in the mouth, facilitating access to the different anatomical parts of the patient. Dental surgery is all the easier, in particular allowing better blood drainage.

[0150] Furthermore, the keys 9 made of a suitable material can be reused, while respecting the restrictions of the surgical field.

[0151] In particular, the possible inclinations of the locking members, in or relative to the plane, offer freedom of design and manufacture of the guide device 1, which was not possible until now.

Claims

Claims

1. Device (1) for a dental surgery stage guide, shaped to cooperate in support and fixation on a dentition to be treated, comprising - a lower base (2) provided with a front face (20) provided with drilling wells (21) and securing said base (2); - at least one removable part, shaped complementary to come to bear on said base (2); - said base (2) comprising interlocking means (5) and said removable part comprising complementary interlocking means (50); - means (6) for locking said removable part into position on said base (2); characterized in that said locking means (6) comprise at least one locking member provided - a lower ring (7) secured to said base (2), a lower orifice (70) being provided within said lower ring (7); - at least one upper ring (8) secured to said removable part, an upper orifice (80) being provided passing through said upper ring (8); the lower orifice (70) being aligned with the upper orifice (80) by fitting the removable part onto the base (2); - at least one key (9) having a body (90) surmounted by a head (91), said body (90) being generally cylindrical and shaped complementary to cooperate and come into the insertion position through said upper orifice (80) within said lower orifice (70) in an axial direction; and in that - said key (9) comprises at least one lower lug (95) projecting laterally; - said lower ring (7) comprises a lower groove (73) shaped complementary to said lower lug (95); - from the insertion position of said key (9), said lower lug (95) is rotatable along said lower groove (73) towards a locking position of said upper ring (8) on said lower ring (7), and vice versa; - in the locking position, said lower lug (95) is blocked within said lower groove (73) in said axial direction.

2. Guide device (1) according to the preceding claim, characterized in that - the upper orifice (80) comprises an upper recess (81) arranged in the axial direction and provided to pass through, said upper recess (81) being shaped complementary to at least said lower lug (95); - the lower orifice (70) comprises a lower recess (74) arranged in the axial direction and shaped complementary to at least said lower lug (95); allowing the insertion of said key (9) in said axial direction through said upper ring (8) within said lower ring (7).

3. Guide device (1) according to any one of the preceding claims, characterized in that said key (9) comprises - an upper lug (97) projecting laterally and aligned with said lower lug (95); - said upper ring (8) comprises an upper groove (82) shaped complementary to said upper lug (97); - from the insertion position of said key (9) to the locking position, and vice versa, said upper lug (97) is locked within said upper groove (82) in said axial direction.

4. Guide device (1) according to any one of the preceding claims, characterized in that - at least said lower groove (73) extends angularly around said lower orifice (70), preferably at an angle of at least 30°, preferably at an angle of approximately 90°.

5. Guide device (1) according to any one of the preceding claims, characterized in that - the axial direction of insertion of said key (9) is oriented relative to the vertical.

6. Guide device (1) according to any one of the preceding claims, characterized in that - said lower ring (7) and said upper ring (8) are oriented according to a determined angular position in a median plane of said guide device (1) and orthogonal to said axial direction.

7. Guide device (1) according to any one of the preceding claims- preceding, characterized in that - at least said lower ring (7) comprises an oblong shape having an offset attachment zone on said base (2).

8. Guide device (1) according to any one of the preceding claims, characterized in that - said lower orifice (70) has a bottom (71) pierced with a hole (72) for extracting said key (9).

9. Guide device (1) according to any one of the preceding claims, characterized in that - said head (91) is provided with gripping means in the form of at least one bore (93), preferably two bores (93) provided through.

10. Guide device (1) according to the preceding claim, characterized in that - said gripping means comprise at least two flares (94) arranged in opposition in the upper part of said body (90).

11. Guide device (1) according to any one of the preceding claims, characterized in that - said body (90) comprises a distal end provided with a chamfer (92).

12. Guide device (1) according to any one of claims 9 to 11, characterized in that - said key (9) comprises between the body (90) and the head (91) a locking means by pressing on the upper ring (8), preferably in the form of a disc (96) extending transversely relative to said body (90).

13. Guide device (1) according to any one of the preceding claims, characterized in that said locking means (6) comprise - at least two locking members distributed around said guide device (1), preferably in opposition on either side of said guide device (1).

14. Guide device (1) according to the preceding claim, characterized in that said locking means (6) comprise - three locking members distributed frontally and on each side of said guide device (1).

Images