Uni-directional driving system

Abstract

The present invention relates to a driving system for a dental implant. The driving system comprises a dental insertion tool (2), which comprises an insertion tool shaft (4) extending along a longitudinal axis L from a coronal end (6) to an apical end (8) and comprising, in its apical end region, a dental implant engagement section (18), which comprises a first torque applying means (20) adapted for engaging the dental implant in a torque transmitting manner, the insertion tool shaft (4) further comprising, in its coronal end region, a drive tool engagement section (10), which comprises a primary torque receiving means (12) adapted for engaging a primary drive tool in a torque transmitting manner, the insertion tool shaft (4) further comprising a break zone (32) arranged between the drive tool engagement section (10) and the dental implant engagement section (18), said break zone being designed to break upon application of a predetermined amount of torque, the insertion tool shaft (4) further comprising, between the break zone (32) and the first torque applying means (20), an auxiliary torque receiving means (36), the primary torque receiving means (12) and the auxiliary torque receiving means (36) each having a cross-section in a plane perpendicular to the longitudinal axis L, the cross-sections being different to one another in shape and / or in size. The driving system further comprises an auxiliary drive tool (52), which comprises a drive tool shaft (54) extending along a longitudinal axis L' from a proximal end (56) to a distal end (58) and comprising, in its distal end region, a second torque applying means (60) adapted to engage with the auxiliary torque receiving means (36) of the insertion tool (2) in a torque transmitting manner but not the primary torque receiving means (12) of the insertion tool (2). In its proximal end region, the drive tool shaft (54) further comprises a uni-directional drive means (70) which enables torque to be transmitted to the auxiliary drive tool (52) in a single rotational direction.

Description

[0001] Uni -Directional Driving System

[0002] The present invention relates to a driving system for a dental implant , and further relates to a dental insertion tool and to an auxiliary drive tool for the driving system .

[0003] Dental implants are well-known in the art and are used for some decades to replace individual teeth or for anchoring more complex structures , such as bridges . The maj ority of commercially available implants comprise a threaded shank which is screwed into a prepared implantation site in the bone . The threads provide the implant with primary stability until the implant is incorporated ( osseointegrated) into the bone structure .

[0004] Insertion tools are used for screwing the implant into the bone by means of a drive tool , such as a ratchet , wrench or motorised dental handpiece . In addition, insertion tools often also serve the function of a " trans fer piece" , i . e . to transport a dental implant from its packaging to the implant site .

[0005] To ful fil its primary purpose , the insertion tool must be capable of trans ferring torque from the drive tool to the implant . Insertion tools therefore comprise a torque applying means shaped to engage the implant in a torque transmitting manner . Torque can for example be transmitted via a friction fit between the tool and the implant , e . g. using complementary conical tapers .

[0006] A23885WO / 2 9 . 09 . 2025 However, in many implant systems the main bul k of torque trans fer occurs via a geometrical fit between the two components .

[0007] In such systems , the implant comprises either an internal or external anti-rotation means . An external anti-rotation means is usually formed at the coronal most end of the implant , whereas an internal anti-rotation means is usually located within an axial bore which extends apically into the implant from its coronal end . The anti-rotation means has a non- circular-symmetric cross-section in a plane perpendicular to the longitudinal axis of the implant . This means that the antirotation means has a cross-section which is not circular about the longitudinal axis i . e . , it does not have a uni form radial length . For example , the anti-rotation means may have a crosssection in the form of a polygon, which provides a number of planar sides angularly spaced about the longitudinal axis of the implant . Alternatively, the anti-rotation means may comprise a number of radially extending grooves or protrusions , which can be curved or planar . These non-circular-symmetric surfaces of the anti-rotation means are referred to herein as " anti-rotation surfaces" .

[0008] The co-operating insertion tools of such systems usually comprise a torque applying means having a non-circular- symmetric cross-section in a plane perpendicular to the longitudinal axis of the insertion tool , which forms at least one non-circular-symmetric torque applying surface . This at least one surface complements an anti-rotation surface of the implant anti-rotation means . When the tool is inserted into or over the anti-rotation means of the implant therefore , these

[0009] A23885WO / 2 9 . 09 . 2025 surfaces align in a rotationally fixed manner, which enables torque to be transmitted to the implant .

[0010] The insertion tool acts to indirectly connect the implant to a drive tool and can thus also be viewed as an adapter, enabling various drive tools to be used to apply torque to a speci fic implant design .

[0011] At their coronal end therefore insertion tools generally comprise a torque receiving means which is shaped to engage and cooperate in a torque transmitting manner with a drive tool . In a similar manner to the torque applying means , the torque receiving means usually comprises a non-circular- symmetric cross-section, resulting in the creation of at least one non-circular-symmetric torque receiving surface . The shape of the cross-section is designed to complement a torque applying means of the drive tool . This torque applying means is usually located at the distal most end of the drive tool and has the form of either a hollow sleeve with an internal wall having a non-circular-symmetric cross-section or a bolt having an external non-circular-symmetric cross-section, resulting in the creation of at least one non-circular- symmetric torque applying surface . The torque receiving means of the insertion tool is complementary to the drive tool torque applying means such that it can be inserted into or over the torque applying means of the drive tool so that the non- circular-symmetric surfaces align in a rotationally locked manner . This means that when the distal end of the drive tool is rotated the insertion tool is similarly rotated, allowing torque to be transmitted to the implant .

[0012] A23885WO / 2 9 . 09 . 2025 Throughout this speci fication, all references to a "non- circular-symmetric" cross-section or surface refer to symmetry with respect to the longitudinal axis of the component to which the cross-section or surface belongs .

[0013] During insertion of the implant into the bone , it i s possible that the surgeon will apply too much torque , which can lead to damage of the implant and - more severely - of the bone . Such damage may include distortion of the implant anti-rotation means , which can lead to j amming of the insertion tool and can also prevent or loosen the connection between the implant and secondary components , such as abutments or prostheses , which often utilise the same anti-rotation means to form a rotationally fixed connection to the implant . In severe cases the implant can break, causing damage to the surrounding bone tissue and making it di f ficult to remove the implant from the bone . In order to avoid this , it is important that the insertion tool breaks before damage to the implant or bone occurs .

[0014] For this reason, insertion tools comprising a break zone have been suggested . The break zone is a zone of weakness on the tool shaft , such as a section of reduced diameter, which will break upon application of a pre-determined amount of torque and thus prevent any further transmittal of torque to the implant . A tool for transmitting torque to a dental implant which has a zone of weakness , at which location the tool deforms above a predetermined torque , is e . g. disclosed in US- A- 2011 / 0143315 .

[0015] Further, EP-A- 1004284 discloses a modular torque-applying surgical tool comprising a driver member and a torque-applying

[0016] A23885WO / 2 9 . 09 . 2025 insert attachable to the driver member, the insert being deformable when subj ected to a torque at or above a predetermined magnitude .

[0017] An alternative insertion tool for use with a dental implant is disclosed in WO 2014 / 053218 . The insertion tool according to WO 2014 / 053218 comprises a break zone , which is designed to break upon application of a predetermined amount of torque , and apical of the break zone comprises an auxiliary torque receiving means adapted for engaging a drive tool in a torque transmitting manner .

[0018] As the break zone of WO 2014 / 053218 is positioned coronal of the auxiliary torque receiving means , this auxiliary means will , after breaking of the insertion tool , be located on the part of the insertion tool still connected to the implant . A drive tool can thus be engaged with this auxiliary torque receiving means in order to remove the implant from the bone . There is no need to replace the broken insertion tool and to use an additional intact insertion tool for this further manipulation . This increases the speed and simplicity of removing a dental implant from the bone in the event of an over-application of torque .

[0019] According to WO 2014 / 053218 , the auxiliary torque receiving means is preferably adapted to receive torque from the same drive tool as the primary torque receiving means . Thus , WO 2014 / 053218 teaches the primary and auxiliary torque receiving means to have identical cross-sections . This can be advantageous from the point of view that no additional drive tool is needed, which further contributes to the speed and simplicity of removing the dental implant from the bone .

[0020] A23885WO / 2 9 . 09 . 2025 However, the primary and auxiliary torque receiving means having the same shape leaves the insertion tool liable to misuse , since it is possible for a user to continue to screw the implant into the bone using the auxiliary torque receiving means . This results in a higher risk of implant breakage during insertion . Not only does this result in the destruction of a valuable medical device and require a new part to be ordered, resulting in additional costs and a delay in treatment , but also the removal of a broken implant from the bone can be complicated and require the removal of additional bone mass .

[0021] This concern is particularly acute in relation to implants formed of a ceramic material , such as zirconia or alumina . Such implants are preferred by some patients due to their white colouring and metal- free composition . However, ceramic materials are more brittle than metals and thus more prone to breaking when subj ected to stress .

[0022] In consideration of these shortcomings , the obj ect of the present invention is to provide a system for inserting a dental implant into bone , which protects the implant from excessive torque loads after breakage of a break zone .

[0023] The obj ect of the present invention is solved by the drive system as defined in independent claim 1 comprising a dental insertion tool and an auxiliary drive tool . Preferred embodiments of the combination are defined in the dependent claims .

[0024] According to the invention, a driving system for a dental implant is provided, the system comprising a dental insertion tool . The dental insertion tool comprises an insertion tool shaft extending along a longitudinal axis L from a coronal end

[0025] A23885WO / 2 9 . 09 . 2025 to an apical end and comprising, in its apical end region, a dental implant engagement section, which comprises a first torque applying means adapted for engaging the dental implant in a torque transmitting manner . The insertion tool shaft further comprises , in its coronal end region, a drive tool engagement section, which comprises a primary torque receiving means adapted for engaging a primary drive tool in a torque transmitting manner . The insertion tool shaft further comprises a break zone arranged between the drive tool engagement section and the dental implant engagement section and designed to break upon application of a predetermined amount of torque . Between the break zone and the first torque applying means , the insertion tool shaft further comprises an auxiliary torque receiving means . The primary torque receiving means and the auxiliary torque receiving means each have a cross-section in a plane perpendicular to the longitudinal axis L, the cross-sections being di f ferent to one another in shape and / or in si ze .

[0026] The driving system of the invention further comprises an auxiliary drive tool . The auxiliary drive tool comprises a drive tool shaft extending along a longitudinal axis L' from a proximal end to a distal end and comprising, in its distal end region, a second torque applying means adapted to engage with the auxiliary torque receiving means of the insertion tool in a torque transmitting manner but not the primary torque receiving means of the insertion tool . In its proximal end region, the drive tool shaft further comprises a unidirectional drive means which enables torque to be transmitted to the auxiliary drive tool in a single rotational direction .

[0027] According to this invention therefore , after breakage of the

[0028] A23885WO / 2 9 . 09 . 2025 insertion tool at the break zone , the original (primary) drive tool can no longer be connected to the insertion tool due to the di f ference in si ze and / or shape between the cross-sections of the primary and auxiliary torque receiving means . Instead, the auxiliary torque receiving means allows connection to a uni-directional drive tool that enables the implant to be removed from, but not further inserted into , the bone .

[0029] The driving system of the invention thus allows the dental implant to be better protected from excessive torque loads , and hence from a potential damage of the implant and / or the bone .

[0030] In accordance with conventional dental terminology, "apical" refers to the direction towards the bone and "coronal" to the direction towards the occlusal surface of the teeth . Therefore , the "apical end" of a component is the end which, in use , is directed towards or into the j awbone and the "coronal end" is the end which, in use , is directed towards or into the oral cavity . In the context of an insertion tool , the coronal end thus corresponds to the end which, in use , is remote from the dental implant whereas the apical end corresponds to the end which is facing the dental implant .

[0031] In the context of this application the term "distal" refers to the end of the drive tool which, in use , is brought into engagement with the insertion tool while the term "proximal" refers to the opposing end of the tool which is furthest , in use , from the insertion tool and which is conversely closest to the hand of the user .

[0032] According to the present invention, the dental implant engagement section comprises a first torque applying means

[0033] A23885WO / 2 9 . 09 . 2025 adapted for engaging a dental implant in a torque transmitting manner . Preferably the first torque applying means has a non- circular-symmetric cross-section in a plane perpendicular to the longitudinal axis of the insertion tool , which forms at least one non-circular-symmetric first torque applying surface . The first torque applying means can have any shape known in the art , e . g . polygonal or hexalobular .

[0034] According to the present invention, the auxiliary drive tool comprises a second torque applying means adapted for engaging the auxiliary torque receiving means in a torque transmitting manner . Preferably the second torque applying means has a non- circular-symmetric cross-section in a plane perpendicular to the longitudinal axis of the auxil iary drive tool , which forms at least one non-circular-symmetric second torque applying surface .

[0035] According to a preferred embodiment , the second torque applying means , in other words the torque applying means of the auxiliary drive tool , is formed by an internal surface , e . g . a hollow sleeve , of the drive tool shaft , the internal surface having a non-circular-symmetric cross-section in a plane perpendicular to the longitudinal axis L' which forms at least one non-circular-symmetric second torque applying surface . Correspondingly, the auxiliary torque receiving means of the insertion tool is preferably formed by a section of insertion tool shaft having a non-circular-symmetric external crosssection forming at least one non-circular-symmetric auxiliary torque receiving surface , the cross section of the auxiliary torque receiving means being complementary to the crosssection of the second torque applying means .

[0036] A23885WO / 2 9 . 09 . 2025 The term "complementary" as used in this context is not to be interpreted as requiring that the second torque applying means and auxiliary torque receiving means necessarily have identically shaped cross-sections , or even identical torque applying and torque receiving surfaces , but only that these can engage one another in a rotationally locked manner such that rotation of the auxiliary drive tool results in rotation of the insertion tool .

[0037] In one example , either the second torque applying means or the auxiliary torque receiving means may comprise radially extending grooves while the other component may comprise radially extending protrusions shaped for accommodation in the grooves .

[0038] In an alternative embodiment the second torque applying means comprises a number of planar torque applying surfaces angularly spaced about the longitudinal axis L ' in a uni form manner to form a polygonal cross-sectional shape and the auxiliary torque receiving means comprises a number of planar torque receiving surfaces angularly spaced about the longitudinal axis L in a uni form manner to form a polygonal cross-sectional shape .

[0039] According to a preferred embodiment , the second torque applying means of the auxiliary drive tool and the auxiliary torque receiving means of the insertion tool have matching crosssections . By "matching" it is meant that the second torque applying means and the auxiliary torque receiving means have the same cross-sectional layout of torque applying surfaces and torque receiving surfaces respectively .

[0040] A23885WO / 2 9 . 09 . 2025 In a particularly preferred embodiment , the auxiliary torque receiving means is formed by a section of the insertion tool shaft comprising a number of external planar torque receiving surfaces angularly spaced about the longitudinal axis L in a uni form manner to form a polygonal cross-sectional shape and the second torque applying means has the form of a hollow sleeve comprising a number of internal planar torque applying surfaces angularly spaced about the longitudinal axis L' in a uni form manner to form a polygonal cross-sectional shape having an equal number of sides to the polygonal cross-sectional shape of the auxiliary torque receiving means .

[0041] In one preferred embodiment , the planar torque receiving surfaces of the auxiliary torque receiving means form a pentagonal cross-sectional shape . The use of an odd-sided polygon is unusual in the dental field and thus provides a relatively simple design which will not cooperate with the maj ority of dental drive tools .

[0042] Additionally or alternatively, the auxiliary torque receiving means may be formed by a section of the insertion tool shaft having a plurality of external non-circular-symmetric torque receiving surfaces which are equal in number and angular orientation to the torque applying surfaces of the first torque applying means , in other words the torque applying means of the insertion tool . This allows the auxiliary torque receiving means to act as a visual aid to the user during normal use of the insertion tool , i . e . , when torque is applied to the tool via the primary torque receiving means . As the first torque applying means aligns during use with the anti-rotation means of the implant , the auxiliary torque receiving means of this embodiment provides an indication to the user of the angular

[0043] A23885WO / 2 9 . 09 . 2025 orientation of the anti-rotation means of the implant during insertion . This can help with the correct positioning of the implant . In such embodiments the auxiliary torque receiving surfaces and first torque applying surfaces may have the same shape , e . g . both may be planar, or they can di f fer from one another . For example , the auxil iary torque receiving means may have planar torque receiving surfaces arranged in a hexagonal layout while the first torque applying means may comprise six grooves or protrusions in the shaft surface , each groove or protrusion being angularly aligned with one of the planar surfaces of the auxiliary torque receiving means .

[0044] According to the present invention the insertion tool comprises a break zone designed to break upon application of a predetermined amount of torque , as mentioned above . In particular, the break zone is located between the primary torque receiving means and the first torque applying means and preferably comprises the section of the insertion tool shaft which has the smallest diameter of the part of the shaft extending between these two means . More preferably the break zone has the smallest diameter of the entire insertion tool .

[0045] In such embodiments , the narrow diameter of the break zone , in comparison to the primary torque receiving means and the first torque applying means , creates a weak point in the shaft which will thus break before other areas of the shaft .

[0046] According to a preferred embodiment the auxiliary torque receiving means is located apically adj acent to the break zone , most preferably directly apically adj acent . This ensures that , after breakage of the insertion tool at the break zone , the auxiliary torque receiving means is easily accessible .

[0047] A23885WO / 2 9 . 09 . 2025 According to the present invention, the primary torque receiving means and the auxiliary torque receiving means of the insertion tool have cross-sections in a plane perpendicular to the longitudinal axis L, which are di f ferent to one another in shape and / or in si ze .

[0048] For example , both torque receiving means may comprise a plurality of radially extending grooves or protrusions , the grooves or protrusions of the primary torque receiving means being di f ferent in shape to the grooves or protrusions of the auxiliary torque receiving means . Alternatively or additionally, the number and angular spacing of the grooves or protrusions of each torque receiving means may di f fer from one another . Alternatively, one of the torque receiving means may comprise a plurality of radially extending grooves and the other torque receiving means a plurality of radially extending protrusions .

[0049] In a preferred embodiment , the primary torque receiving means is formed by a section of insertion tool shaft having a non- circular-symmetric cross-section forming a plurality of external non-circular-symmetric primary torque receiving surfaces and the auxiliary torque receiving means is formed by a section of insertion tool shaft having a non-circular- symmetric cross-section forming a plurality of external non- circular-symmetric auxiliary torque receiving surfaces , wherein the number of primary torque receiving surfaces is di f ferent to the number of auxiliary torque receiving surfaces .

[0050] Preferably the primary and auxiliary torque receiving surfaces are planar and angularly spaced about the longitudinal axis

[0051] A23885WO / 2 9 . 09 . 2025 in a uni form manner to form polygonal cross-sectional shapes with a di f fering number of sides . Such polygonal shapes are preferred as they are simple to manufacture . For example , the auxiliary torque receiving surfaces may form a pentagonal cross-sectional shape , whereas the primary torque receiving surfaces may form a hexagonal cross-sectional shape , or the auxiliary torque receiving surfaces may form a hexagonal cross- sectional shape , whereas the primary torque receiving surfaces may form an octagonal cross-sectional shape . Such di f ferences in shape ensure that the auxiliary drive tool can interact with the auxiliary torque receiving means , but not with the primary torque receiving means . Incorrect use of the components of the present invention can thus be easily and ef fectively avoided .

[0052] Alternatively or additionally to the primary torque receiving means and the auxiliary torque receiving means having crosssections of di f ferent shapes , the cross-sections can also di f fer in their si ze . In other words , the maximum radial distance of the primary torque receiving surfaces from the longitudinal axis can be di f ferent from the maximum radial distance of the auxiliary torque receiving surfaces . In particular, the auxiliary torque receiving means can have a greater cross-sectional si ze than the primary torque receiving means , thereby preventing the primary drive tool from fitting onto and cooperating with the auxiliary torque receiving means .

[0053] According to the present invention, the dental implant engagement section comprises a first torque applying means adapted for engaging a dental implant in a torque transmitting manner, as described above .

[0054] A23885WO / 2 9 . 09 . 2025 According to a preferred embodiment , the dental implant engagement section of the insertion tool further comprises , in addition to the first torque applying means , a dental implant retention element adapted for releasably holding the dental implant . The dental implant retention element thus provides axial retention and enables the dental implant to be carried on the insertion tool .

[0055] Preferably the dental implant retention element is located apical of the first torque applying means .

[0056] In preferred embodiments the dental implant retention element is a resilient member that can be connected to the implant via a snap or press fit . This improves the ease of connection and disconnection as this can be achieved solely through axial movement of the insertion tool relative to the implant .

[0057] The resilient member can be designed to connect to the interior or exterior of the implant , depending on implant design and user wishes . Preferably the resilient member is arranged for insertion into an internal bore of the implant . In this way, contact is avoided with the external surfaces of the implant .

[0058] In one embodiment the resilient member comprises an annular ring . This ring can be open ( a spl it or c-ring) or closed ( an o-ring) and is usually made of an elastomeric material , such as PEEK, or metal , such as TAN . The ring is si zed such that , upon insertion into the implant bore or over the coronal end of the implant , it forms a press or snap fit with the implant .

[0059] In other embodiments the resilient member is an integral part of the dental implant engagement section . This increases the

[0060] A23885WO / 2 9 . 09 . 2025 ease of production and prevents disconnection of the member during use .

[0061] In one embodiment , the resilient member comprises at least one , more preferably at least two , longitudinally extending retention arm which is resiliently deflectable towards and / or away from the longitudinal axis for engaging in a press or snap fit with the implant .

[0062] In preferred embodiments the one or more arm is arranged to engage the internal bore of an implant .

[0063] According to the present invention, the drive tool engagement section of the insertion tool comprises a primary torque receiving means adapted for engaging a primary drive tool in a torque transmitting manner, as described above . In preferred embodiments , the drive tool engagement section may further comprise a drive tool retention element for releasably holding the primary drive tool . The drive tool retention element thus provides axial retention and enables the insertion tool to be carried on the primary drive tool .

[0064] Preferably the drive tool retention element is a resilient member that can be connected to the primary drive tool via a snap or press fit , and thus connection and disconnection can be achieved solely through axial movement of the insertion tool relative to the primary drive tool . Analogous to the resilient member described above in relation to the dental implant retention element , the resilient member of the drive tool retention element can comprise a PEEK or TAN ring which provides a snap or press fit when inserted into or over the primary drive tool .

[0065] A23885WO / 2 9 . 09 . 2025 Alternatively, the drive tool retention element may comprise an annular groove for housing a resilient element , such as an elastomeric or metal ring, that is located on the primary drive tool .

[0066] Preferably the drive tool retention element is located coronal of the primary torque receiving means .

[0067] As mentioned above , the auxiliary drive tool of the present invention comprises a uni-directional drive means which enables torque to be transmitted to the auxiliary drive tool in a single rotational direction only . Hence , torque can only be transmitted in the direction for screwing the dental implant out of the implantation site , thereby preventing maloperation of the insertion tool and, thus , potential implant breakage and bone damage . In this regard, it is preferred that the unidirectional drive means enables torque to be transmitted to the auxiliary drive tool in a counter-clockwise direction only .

[0068] According to a preferred embodiment , the uni-directional drive means has a larger diameter than the second torque applying means . Thus , the drive means al lows a torque lever to be applied on the auxiliary drive tool .

[0069] Additionally or alternatively, the uni-directional drive means of the auxiliary drive tool may take the form of a ratchet wheel . Hence , the concept of enabling torque to be transmitted to the auxiliary drive tool in a single rotational direction can be reali zed by a common wrench, as will be explained in detail in the context of the figures below .

[0070] A23885WO / 2 9 . 09 . 2025 In a particularly preferred embodiment , the uni-directional drive means comprises a plurality of circumferentially spaced drive surfaces , each drive surface extending substantially in or parallel to a radial plane ( i . e . a plane extending radially from and containing the longitudinal axis ) , the plurality of drive surfaces facing in a single rotational direction, in particular the clockwise direction . The term " substantially" as used in this context means that any angular deviation of the drive surfaces from the radial plane is less than 10 ° , preferably less than 5 ° . Further, the term " facing in a ... direction" is to be understood as meaning that the respective surface " faces" in the direction of the outwardly pointing normal to the surface . As used in the context of the present invention, the terms " clockwise" and " counter-clockwise" refer to the rotational direction as viewed from the coronal end of the component , which is equivalent to the viewpoint of the user . In this embodiment , the uni-directional drive means further comprises a plurality of release surfaces interposed between the drive surfaces , wherein each release surface faces one of the plurality of drive surfaces to form a pair , the release surfaces therefore facing in the opposite rotational direction to the drive surfaces , in particular in the counterclockwise direction, the release surface of each pair tapering away from its paired drive surface in a radially outwards direction . In other words , the release surfaces are angled or curved relative to a radial line extending from the longitudinal axis L' to the radially inner end of the release surface such that the circumferential distance between the release surface and its paired drive surface increases as the distance from the longitudinal axis increases . Preferably, the angle enclosed by the release surface and the radial line is

[0071] A23885WO / 2 9 . 09 . 2025 more than 10 ° , preferably more than 30 ° , most preferably between 45 ° and 75 ° . As will be explained in detail in the context of the working examples and the figures , the unidirectional application of torque can by this embodiment be achieved in an ef ficient and straightforward manner .

[0072] In this regard, it is further preferred that each drive surface has a length and each release surface has a length, the length of the release surfaces being greater than their paired drive surfaces .

[0073] In this context , the term " length" relates to the distance along the surface from the radially innermost end of the surface to its radially outermost end . The length of the release surfaces being greater than that of the drive surfaces reflects the fact that the release surfaces are tilted or curved with respect to a radial plane , and thus have a greater circumferential dimension than the drive surfaces .

[0074] As will be described further in the context of the figures , the preferred configuration of the auxiliary drive tool ensures that when using a common wrench comprising a pawl , torque can be applied in one direction of rotation only, typically in the counter-clockwise direction : When the wrench is rotated in counter-clockwise direction, the pawl is locked against a respective drive surface , thus enabling torque to be transmitted to the drive tool in this direction . However, when the wrench is rotated in a clockwi se direction, the pawl slides up the release surface and, after having reached the end of the release surface , is owing to a spring force pushed back towards the shaft of the drive tool in the initial position, from which it again slides up the following release surface

[0075] A23885WO / 2 9 . 09 . 2025 and so on . Hence , no torque is applied by rotating the wrench in a clockwise direction .

[0076] By this mechanism, torque is transmitted to the auxiliary drive tool in a counter-clockwise direction only . Hence , maloperation of the insertion tool , which might lead to further insertion of the dental implant and ultimately to breakage of the implant and damage of the bone , can be ef ficiently prevented .

[0077] Preferably, each pair of drive and release surfaces are formed as grooves or notches recessed in the auxiliary drive tool shaft . In particular, the uni-directional drive means preferably comprises a circular cylindrical section of the auxiliary drive tool shaft in which a plurality of notches are formed, each notch forming a drive surface and a release surface . Preferably this circular cylindrical section has a diameter greater than the diameter of the distal end region of the shaft , and hence the second torque applying means . Alternatively, it is also conceivable that each pair of drive and release surfaces are formed by protrusions , e . g. prongs , extending outwards from the drive tool shaft .

[0078] According to a preferred embodiment , the driving system of the present invention additionally comprises a wrench for applying torque to the uni-directional drive means of the auxiliary drive tool , in particular a socket wrench, more particularly a socket wrench comprising a pawl , as will also be explained in the context of the figures . With regard to this embodiment , it is in particular conceivable that the driving system constitutes a kit of parts comprising the wrench .

[0079] A23885WO / 2 9 . 09 . 2025 Additionally or alternatively, the driving system further comprises a primary drive tool . The primary drive tool has a drive tool shaft extending along a longitudinal axis L' ’ from a proximal end to a distal end and comprises in its distal end region a third torque applying means , the third torque applying means being adapted to engage with the primary torque receiving means of the insertion tool in a torque transmitting manner but not the auxiliary torque receiving means of the insertion tool . In its proximal end region, the primary drive tool shaft further comprises a drive means which enables torque to be transmitted to the primary drive tool . Preferably the drive means is a bi-directional drive means , such that torque can be transmitted to the primary drive tool in both clockwise and counter-clockwise directions .

[0080] According to a particularly preferred embodiment , the third torque applying means , in other words the torque applying means of the primary drive tool , is formed by an internal surface , e . g . a hollow sleeve , of the primary drive tool shaft , the internal surface having a non-circular-symmetric cross-section in a plane perpendicular to the longitudinal axis L' ’ , which forms at least one non-circular-symmetric third torque applying surface , the cross-section being complementary to the cross-section of the primary torque receiving means , such that torque can be trans ferred between the primary drive tool and primary torque receiving means , and not complementary to the cross-section of the auxiliary torque receiving means , such that torque cannot be transmitted between the primary drive tool and the auxiliary torque receiving means .

[0081] Alternatively, it is also conceivable that the primary torque receiving means of the insertion tool is formed by a recess in

[0082] A23885WO / 2 9 . 09 . 2025 the insertion tool shaft having a non-circular-symmetric internal cross-section forming at least one non-circular- symmetric primary torque receiving surface . In such embodiments the third torque applying means preferably comprises a bolt having an external non-circular-symmetric cross-section complementary to the cross-section of the primary torque receiving means .

[0083] Hence , the third torque applying means is designed such that it can be inserted into or over the primary torque receiving means of the insertion tool such that the non-circular- symmetric cross-sections align in a rotationally locked manner .

[0084] As above , the term "complementary" is not to be interpreted as requiring that the third torque applying means and the primary torque receiving means necessarily have identically shaped cross-sections , or even identical torque applying and torque receiving surfaces , but only that these can engage one another in a rotationally locked manner such that rotation of the primary drive tool results in rotation of the insertion tool .

[0085] According to a preferred embodiment , the third torque applying means and the primary torque receiving means have matching cross-sections . Again, by "matching" it is meant that the third torque applying means and the primary torque receiving means have the same cross-sectional layout of torque applying surfaces and torque receiving surfaces respectively .

[0086] In a particular embodiment , the primary torque receiving means is formed by a section of the insertion tool shaft comprising a plurality of external planar primary torque receiving surfaces angularly spaced about the longitudinal axis L in a

[0087] A23885WO / 2 9 . 09 . 2025 uni form manner to form a polygonal cross-sectional shape and the third torque applying means is formed by a hollow sleeve in the primary drive tool shaft comprising a plurality of internal planar torque applying surfaces angularly spaced about the longitudinal axis L' ' in a uni form manner to form a polygonal cross-sectional shape having an equal number of sides to the polygonal cross-sectional shape of the primary torque receiving means . Preferably the number of sides of the primary torque receiving means and third torque applying means is di f ferent to the number of sides of a polygonal cross-sectional shape of the auxiliary torque receiving means . In a particularly preferred embodiment , the polygonal cross- sectional shapes of the primary torque receiving means and the third torque applying means have an even number of sides , most preferably 6 or 8 , while the polygonal cross-sectional shape of the auxiliary torque receiving means has an odd number of sides , most preferably 5 .

[0088] According to a further aspect , for which protection is sought individually, the present invention also relates to a dental insertion tool for use in the system disclosed above , for transmitting torque from a drive tool to a dental implant .

[0089] As described above in the context of the driving system, the insertion tool of the present invention ensures that the auxiliary torque receiving means can interact with the auxiliary drive tool , but not with the primary drive tool . Hence the risk o f the user continuing to apply an insertion torque to the implant after breaking of the insertion tool at the break zone , which might lead to damage of the implant or bone , is mitigated .

[0090] A23885WO / 2 9 . 09 . 2025 The preferred features of the dental insertion tool disclosed in the context o f the system described above , likewise are preferred features of the insertion tool in isolation .

[0091] In addition to the driving system and the insertion tool described above , the present invention relates , according to a still further aspect , to an auxiliary drive tool for use in said system for transmitting torque to a dental insertion tool in a single rotational direction .

[0092] As described above , the auxiliary drive tool comprises a drive tool shaft extending along a longitudinal axis L' from a proximal end to a distal end, and comprises , in its distal end region, a second torque applying means adapted to engage with an auxiliary torque receiving means of the insertion tool .

[0093] The preferred features of the auxiliary drive tool disclosed in the context o f the system described above , likewise are preferred features of the auxiliary drive tool in isolation .

[0094] The invention is further illustrated by way of example only with reference to the attached figures , of which :

[0095] Fig . 1 shows a perspective view of an insertion tool of a driving system according to a preferred embodiment of the present invention;

[0096] Fig . 2 shows a perspective view of an auxiliary drive tool of the driving system according to a preferred embodiment of the present invention adapted to engage with the insertion tool of Fig . 1 ;

[0097] A23885WO / 2 9 . 09 . 2025 Fig. 3 shows a side view of the insertion tool shown in Fig. 1 (Fig. 3A) together with cross-sections through section plane A-A (Fig. 3B) and section plane B-B (Fig. 3C) ;

[0098] Fig. 4 shows a side view of the auxiliary drive tool shown in Fig. 2 (Fig. 4A) together with cross-sections through section plane A-A (Fig. 4B) and section plane B-B (Fig. 4C) ;

[0099] Fig. 5 shows the combination of the insertion tool of Fig.

[0100] 1 and a primary drive tool in further combination with a dental implant to be inserted and a wrench for applying torque to the primary drive tool (Fig. 5A) , together with the primary drive tool acting on the insertion tool being shown in cross-section through section plane A-A (Fig. 5B) and the wrench acting on the primary drive tool being shown in cross-section through section plane B-B (Fig. 5C) ; and

[0101] Fig. 6 shows the combination of the insertion tool and the dental implant shown in Fig. 5 after breakage of the insertion tool, in further combination with the auxiliary drive tool of Fig. 2 and a wrench for applying torque to the auxiliary drive tool (Fig. 6A) , together with the auxiliary drive tool acting on the broken insertion tool being shown in crosssection through section plane C-C (Fig. 6B) and the wrench acting on the auxiliary drive tool being shown

[0102] A23885WO / 29.09.2025 in cross-section through section plane D-D ( Fig .

[0103] 6C ) .

[0104] As shown in Fig . 1 , the insertion tool 2 of the driving system of the present invention comprises an insertion tool shaft 4 extending along a longitudinal axis L from a coronal end 6 to an apical end 8 . In the coronal end region of the shaft 4 , a drive tool engagement section 10 is formed, which comprises a primary torque receiving means 12 adapted for engaging a primary drive tool ( as e . g. the one shown in Fig . 5 ) in a torque transmitting manner .

[0105] In the speci fic embodiment shown in Fig . 1 , the primary torque receiving means 12 is formed by a section of insertion tool shaft 4 having a non-circular-symmetric cross-section forming a plurality of external non-circular-symmetric primary torque receiving surfaces 14 which are planar and angularly spaced about the longitudinal axis L in a uni form manner to form a polygonal cross-sectional shape 121 , more speci fically a hexagonal shape , as is particularly shown in Fig . 3C and 5B . As can be seen in Fig . 3C and 5B, although the primary torque receiving surfaces 14 together form a hexagonal shape , the overall cross-section of the primary torque receiving means 12 deviates from a pure hexagon as the corners of the hexagon are beveled to prevent sharp edges .

[0106] Coronal of the primary torque receiving means 12 , the drive tool engagement section 10 further comprises a drive tool retention element 16 for releasably holding a primary drive tool . In this embodiment the drive tool retention element 16 comprises an annular groove 13 for housing a resilient element , e . g . an o-ring, located on the primary drive tool , or other

[0107] A23885WO / 2 9 . 09 . 2025 co-operating device .

[0108] In the apical end region of the insertion tool shaft 4 , a dental implant engagement section 18 is formed which comprises a first torque applying means 20 adapted for engaging a dental implant in a torque transmitting manner, and thus applying torque to the dental implant .

[0109] In the embodiment shown, the first torque applying means 20 has a non-circular-symmetric cross-section in a plane perpendicular to the longitudinal axis L, which forms a plurality of non-circular-symmetric first torque applying surfaces 26 . In this embodiment , the first torque applying surfaces 26 take the form of longitudinally extending grooves 24 formed in a circular cylindrical section 21 of the shaft 4 , which are angularly spaced around the longitudinal axis L in a uni form manner . Each groove 24 is curved, such that the cross-section of the grooves in a plane perpendicular to the longitudinal axis L is arc-shaped .

[0110] Between the drive tool engagement section 10 and the dental implant engagement section 18 , the insertion tool shaft 4 comprises a break zone 32 , which is designed to break upon application of a predetermined amount of torque Tbreak .

[0111] As can be clearly seen in Fig . 5A, the break zone 32 comprises the section of the insertion tool shaft 4 having the smallest diameter between the primary torque receiving means 12 and the first torque applying means 20 .

[0112] Between the first torque applying means 20 and the break zone

[0113] 32 , the insertion tool shaft 4 further comprises an auxiliary torque receiving means 36 , which is adapted for receiving

[0114] A23885WO / 2 9 . 09 . 2025 torque from an auxiliary drive tool . In the embodiment shown, the auxiliary torque receiving means 36 is located directly apically adj acent to the break zone 32 .

[0115] The auxiliary torque receiving means 36 is formed by a section of insertion tool shaft 4 having a non-circular-symmetric external cross-section forming a plurality of non-circular- symmetric auxiliary torque receiving surfaces 37 which are planar and angularly spaced about the longitudinal axis L in a uni form manner to form a polygonal cross-sectional shape , more speci fically a pentagonal shape , as is particularly shown in Fig . 3B and 6B . Although the auxiliary torque receiving surfaces 37 together form a pentagonal shape , the overall cross-section of the auxiliary torque receiving means 36 deviates slightly from a pure pentagon as the corners of the pentagon are beveled to prevent sharp edges .

[0116] The dental implant engagement section 18 further comprises , apical of the first torque applying means 20 , a dental implant retention element 39 for releasably holding a dental implant . In this embodiment , the dental implant retention element 39 is a resilient member designed to connect to the interior of the implant via a press fit . The resilient member is an integral part of the dental implant engagement section 18 and comprises two identically formed longitudinally extending retention arms 40a, 40b which are resiliently deflectable towards and away from the longitudinal axis L . The retention arms 40a, 40b extend to the apical end 8 of the insertion tool 2 , as in particularly shown in Fig . 3A. The dental implant retention arms 40a, 40b are separated from each other by a longitudinal slit 42 having an axis coinciding with the longitudinal axis L of the insertion tool 2 ; they are thus arranged symmetrically

[0117] A23885WO / 2 9 . 09 . 2025 about the longitudinal axis L of the insertion tool 2 .

[0118] In use the retention arms 40a, 40b lock into a respective cavity of the dental implant and thus prevent axial displacement of the insertion tool when connected with the dental implant ( see Fig . 5A) .

[0119] Fig . 2 shows an auxiliary drive tool 52 adapted for transmitting torque to the insertion tool 2 shown in Fig . 1 . The auxiliary drive tool 52 comprises a drive tool shaft 54 extending along a longitudinal axis L' from a proximal end 56 to a distal end 58 . The drive tool shaft 54 comprises , in its distal end region, a second torque applying means 60 adapted to engage with the auxiliary torque receiving means 36 of insertion tool 2 in a torque transmitting manner but not the primary torque receiving means 12 . In the speci fic embodiment shown, the second torque applying means 60 is formed by a hollow sleeve 62 of the drive tool shaft 54 . As in particular shown in Fig . 4B, the internal surface of the sleeve 62 has a non-circular-symmetric cross-section in a plane perpendicular to the longitudinal axis L ' which forms a plural ity of non- circular-symmetric second torque applying surfaces 64 which are planar and angularly spaced about the longitudinal axis 1 / in a uni form manner to form a polygonal cross-sectional shape , more speci fically a pentagonal shape . As can be seen in Fig . 4B and 6B, although the second torque applying surfaces 64 together form a pentagonal shape , the overall cross-section of the torque applying means 60 deviates from a pure pentagon as convex recesses 66 are formed in a centre region of the planar surfaces 64 in order to assist with manufacturing .

[0120] The cross-section of the second torque applying means 60 is

[0121] A23885WO / 2 9 . 09 . 2025 complementary to the cross-section of the auxiliary torque receiving means 36 . Speci fically, in the present embodiment the second torque applying surfaces 64 have the same cross- sectional layout , i . e . pentagonal , as the auxiliary torque receiving surfaces 37 and thus the second torque applying means 60 and auxiliary torque receiving means 36 have matching crosssections .

[0122] In use , the auxiliary torque receiving means 36 fits closely into the second torque applying means 60 of the auxiliary drive tool 52 , i . e . the hollow sleeve 62 , as shown in Fig . 6A and 6B . Speci fically, the torque applying surfaces 64 directly abut on the respective auxiliary torque receiving surfaces 37 of the auxiliary torque receiving means 36 , thereby enabling engagement of the auxiliary torque receiving means 36 with the second torque applying means 60 in a torque transmitting manner .

[0123] In its proximal end region, the drive tool shaft 54 of the auxiliary drive tool 52 comprises a uni-directional drive means 70 , which enables torque to be transmitted in a single rotational direction . In the speci fic embodiment shown the uni-directional drive means 70 has a larger diameter than the second torque applying means 60 . Hence , the uni-directional drive means 70 allows a torque lever to be applied on the auxiliary drive tool 52 .

[0124] In the speci fic embodiment shown in Fig . 2 , the uni-directional drive means 70 has a plurality of circumferentially spaced drive surfaces 74 , each of which extends substantially parallel to a radial plane , as in particular shown by Fig . 4C . The plurality of drive surfaces 74 face in a single rotational

[0125] A23885WO / 2 9 . 09 . 2025 direction, namely the clockwise direction indicated by an arrow in Fig . 4C .

[0126] The uni-directional drive means 70 further comprises a plurality of release surfaces 76 interposed between the drive surfaces 74 . Each release surface 76 faces one of the drive surfaces 74 to form a pair, the release surfaces 76 therefore facing in the opposite direction to the drive surfaces 74 , namely the counter-clockwise direction . The release surface 76 of each pair tapers away from its paired drive surface 74 in a radially outwards direction . Consequently, each release surface 76 is angled relative to a radial line extending from the longitudinal axis L' to the radially inner end of the release surface 76 , as can be seen in Fig . 4C . The circumferential distance between the release surface 76 and its paired drive surface 74 therefore increases as the distance from the longitudinal axis increases .

[0127] In the speci fic embodiment shown, each pair of drive surfaces 74 and release surfaces 76 are formed by the lateral surfaces of a notch 78 recessed in a circular cylindrical section of the auxiliary drive tool shaft 54 , each release surface 76 having a greater length than its paired drive surface 74 . As the drive surfaces 74 extend substantially parallel to a radial plane whereas the release surfaces 76 are angled relative to such a plane , the release surfaces 76 extend in a direction of fset from the direction of the drive surfaces 74 , thus enclosing an angle a with their paired drive surface . In the present embodiment this angle is 60 ° .

[0128] The concept of the present invention is further explained by means of Fig . 5 and 6 , where di f ferent situations during the

[0129] A23885WO / 2 9 . 09 . 2025 insertion of a dental implant by means of the insertion tool

[0130] 2 are shown :

[0131] For inserting the dental implant 80 into the implantation site of the bone , torque is applied from a primary drive tool 82 to the insertion tool 2 , which transmits torque to the dental implant 80 ; this situation is shown in Fig . 5A. In the speci fic situation shown, torque is applied to the primary drive tool 82 via a handpiece comprising a wrench 84 .

[0132] The primary drive tool 82 has a drive tool shaft 83 extending along a longitudinal axis L' ’ from a proximal end 81 to a distal end 92 . In its distal end region the primary drive tool shaft 83 comprises a third torque applying means 88 which is adapted to engage with the primary torque receiving means 12 of the insertion tool 2 in a torque transmitting manner but not the auxiliary torque receiving means 36 of the insertion tool 2 . In the speci fic embodiment shown, the third torque applying means 88 of the primary drive tool 82 is formed by a hollow sleeve 90 of the primary drive tool shaft 83 . The internal surface of the hollow sleeve 90 has a non-circular symmetric cross-section in a plane perpendicular to the longitudinal axis L' ’ which forms a plurality of non-circular symmetric third torque applying surfaces 94 . The cross-section of the hollow sleeve 90 is complementary to the cross-section of the primary torque receiving means 12 , such that torque can be trans ferred between the components . In the speci fic embodiment shown, the primary torque receiving means 12 and third torque applying means 88 have matching cross-sections , in that the torque applying surfaces 94 have the same cross- sectional layout , i . e . , hexagonal , as the primary torque receiving surfaces 14 .

[0133] A23885WO / 2 9 . 09 . 2025 In its proximal end region, the primary drive tool shaft 83 comprises a bi-directional drive means 100 , which comprises a plurality of notches 102 , each of which comprising a ground surface 104 and two lateral surfaces 106a, 106b on either side of the ground surface and extending essentially parallel to one another and to a radial plane , as best seen in Fig . 5C .

[0134] As shown in Fig . 5C, the wrench 84 comprises a pawl 108 in the form of a spring-loaded finger, which at its tip forms a lateral surface 110 .

[0135] When engaged with the bi-directional drive means 100 of the primary drive tool 82 , the lateral surface 110 of the pawl 108 can act on both of the lateral surfaces 106a, 106b of the notch 102 , thus allowing torque to be applied in both directions of rotation . In other words , both the lateral surfaces 106a, 106b of the drive means 100 of the primary drive tool 82 can act as drive surfaces .

[0136] I f , during insertion of a dental implant 80 , too much torque is applied via the primary drive tool 82 ( i . e . by application of a predetermined amount of torque Tbreak) , the insertion tool 2 breaks at the break zone 32 , which safeguards that neither the dental implant 80 nor the bone is damaged .

[0137] Due to the provision of a break zone 32 , the insertion tool 2 breaks at a well-defined point . The user can then remove the coronal part of the broken insertion tool 2 via the primary drive tool 82 ( if it is still engaged with the primary drive tool ) or by hand . After removal of the coronal part of the broken insertion tool 2 , the auxil iary torque receiving means 36 is exposed at the coronal end region of the part of the broken insertion tool 2 still connected to the implant 80 . It

[0138] A23885WO / 2 9 . 09 . 2025 can thus be easily accessed by the auxiliary drive tool 52 for further manipulation of the dental implant 80 , which situation is shown in Fig . 6A.

[0139] Speci fically, the hollow sleeve 62 of the auxiliary drive tool 52 is now put over the auxiliary torque receiving means 36 in a closely fitting engagement , shown in Fig . 6A and 6B . This engagement is only possible with the auxiliary torque receiving means 36 due to the complementary nature of the cross-sections . In contrast , the cross-section o f the third torque applying means 88 of the primary drive tool 82 is not complementary to the cross-section of the auxiliary torque receiving means 36 , such that these components cannot be engaged in a torque transmitting manner . Similarly, torque trans fer between the auxiliary drive tool 52 and the primary torque receiving means 12 is also prevented .

[0140] When the wrench 84 is engaged with the uni-directional drive means 70 of the auxiliary drive tool 52 , torque can be applied in the counter-clockwise direction only :

[0141] When rotated in counter-clockwise direction, the pawl 108 is locked against a drive surface 74 , thus enabling torque to be transmitted to the auxiliary drive tool 52 in this direction .

[0142] However, when the wrench 84 is flipped about its longitudinal axis for clockwise driving, the lateral surface 110 of the pawl 108 slides up the release surface 76 and, after having reached the end of the release surface , is owed to the spring force pushed back towards the shaft 54 of the drive tool 52 in the initial position, from which it again slides up the following release surface 76 and so on . Hence , no torque is applied by rotating the wrench 84 in a clockwise direction .

[0143] A23885WO / 2 9 . 09 . 2025 By this mechanism, torque is transmitted to the auxiliary drive tool 52 in a counter-clockwise direction only . Hence , maloperation of the insertion tool 2 , which might lead to further insertion of the dental implant 80 and ultimately to breakage of the implant and damage of the bone , can be ef ficiently prevented .

[0144] The above embodiments are described by way of example only and other variations are possible which fall within the scope of the claims . For example , di f ferent cross-sections of the torque applying and torque receiving means are possible , e . g . di f ferent polygonal shapes or a number of grooves and / or protrusions . In one alternative the auxiliary torque receiving means 36 could comprise torque receiving surfaces 37 arranged in a hexagonal shape , orientated such that each surface is in angular alignment with a groove 24 of the first torque applying means 20 . In this way the auxiliary torque receiving means 36 can act as a visual aid to the user during use of the primary torque receiving means 12 and primary drive tool 82 . In such embodiments the primary torque receiving surfaces can be arranged in, e . g, an octagonal shape , or a hexagonal shape with larger dimensions than the auxiliary torque receiving means . In this way, the di f ference between the cross-sections of the primary torque receiving means and the auxil iary torque receiving means is maintained .

[0145] A23885WO / 2 9 . 09 . 2025 List of reference numerals

[0146] (2) Insertion tool

[0147] (4) Insertion tool shaft

[0148] (L) Longitudinal axis

[0149] (6) Coronal end

[0150] (8) Apical end

[0151] (10) Drive tool engagement section

[0152] (12) Primary torque receiving means

[0153] (121) Polygonal cylinder

[0154] (13) Annular groove

[0155] (14) Primary torque receiving surface

[0156] (16) Drive tool retention element

[0157] (18) Dental implant engagement section

[0158] (20) First torque applying means

[0159] (21) Circular cylindrical section

[0160] (24) Longitudinal groove

[0161] (26) Torque applying surface

[0162] (32) Break zone

[0163] (36) Auxiliary torque receiving means

[0164] (37) Auxiliary torque receiving surface

[0165] (39) Dental implant retention element

[0166] (40a, 40b) Longitudinal dental implant retention arms

[0167] (42) Longitudinal slit

[0168] (52) Auxiliary drive tool

[0169] (54) Drive tool shaft

[0170] (L' ) Longitudinal axis

[0171] (56) Proximal end

[0172] (58) Distal end

[0173] (60) Second torque applying means

[0174] (62) Hollow sleeve

[0175] (64) Second torque applying surfaces

[0176] A23885WO / 29.09.2025 (70) Uni-directional drive means

[0177] (74) Drive surfaces

[0178] (76) Release surfaces

[0179] (78) Notch

[0180] (a) Angle a

[0181] (80) Dental implant

[0182] (81) Proximal end

[0183] (82) Primary drive tool

[0184] (83) Primary drive tool shaft

[0185] (84) Wrench

[0186] (88) Third torque applying means

[0187] (90) Hollow sleeve

[0188] (94) Torque applying surfaces

[0189] (100) Bi-directional drive means

[0190] (102) Notches

[0191] (104) Ground surface

[0192] (106a, 106b) Lateral surfaces

[0193] (108) Pawl

[0194] (110) Lateral surface of pawl

[0195] A23885WO / 29.09.2025

Claims

38Claims1. A driving system for a dental implant, the driving system comprising a dental insertion tool (2) , which comprises an insertion tool shaft (4) extending along a longitudinal axis L from a coronal end (6) to an apical end (8) and comprising, in its apical end region, a dental implant engagement section (18) , which comprises a first torque applying means (20) adapted for engaging the dental implant in a torque transmitting manner, the insertion tool shaft (4) further comprising, in its coronal end region, a drive tool engagement section (10) , which comprises a primary torque receiving means (12) adapted for engaging a primary drive tool in a torque transmitting manner, the insertion tool shaft (4) further comprising a break zone (32) arranged between the drive tool engagement section (10) and the dental implant engagement section (18) , said break zone being designed to break upon application of a predetermined amount of torque, the insertion tool shaft (4) further comprising, between the break zone (32) and the first torque applying means (20) , an auxiliary torque receiving means (36) , the primary torque receiving means (12) and the auxiliary torque receiving means (36) each having a cross-section in a plane perpendicular to the longitudinal axis L, the crosssections being different to one another in shape and / or in size, wherein the driving system further comprises an auxiliary drive tool (52) , which comprises a drive tool shaft (54) extending along a longitudinal axis L' from a proximal end (56) to a distal end (58) and comprising, in itsA23885WO / 29.09.202539 distal end region, a second torque applying means (60) adapted to engage with the auxiliary torque receiving means (36) of the insertion tool (2) in a torque transmitting manner but not the primary torque receiving means (12) of the insertion tool (2) , and the drive tool shaft (54) further comprising, in its proximal end region, a uni-directional drive means (70) which enables torque to be transmitted to the auxiliary drive tool (52) in a single rotational direction.

2. The driving system according to claim 1, wherein the second torque applying means (60) is formed by a hollow sleeve (62) of the drive tool shaft (54) , the internal surface of the sleeve having a non-circular-symmetric cross-section in a plane perpendicular to the longitudinal axis L' which forms at least one non- circular-symmetric second torque applying surface (64) , and wherein the auxiliary torque receiving means (36) is formed by a section of insertion tool shaft (4) having a non-circular-symmetric external cross-section forming at least one non-circular-symmetric auxiliary torque receiving surface (37) , the cross section of the auxiliary torque receiving means (36) being complementary to the cross-section of the second torque applying means (60) .

3. The driving system according to claim 2, wherein the second torque applying means (60) and the auxiliary torque receiving means (36) have matching cross-sections.

4. The driving system according to any of the preceding claims, wherein the auxiliary torque receiving means (36) is formed by a section of the insertion tool shaft (4)A23885WO / 29.09.202540 comprising a number of external planar torque receiving surfaces (14) angularly spaced about the longitudinal axis L in a uniform manner to form a polygonal cross- sectional shape and the second torque applying means (60) has the form of a hollow sleeve (62) comprising a number of internal planar torque applying surfaces (64) angularly spaced about the longitudinal axis L' in a uniform manner to form a polygonal cross-sectional shape having an equal number of sides to the polygonal cross- sectional shape of the auxiliary torque receiving means (36) .

5. The driving system according to any of the preceding claims, wherein the primary torque receiving means (12) is formed by a section of insertion tool shaft (4) having a non-circular-symmetric cross-section forming a plurality of external non-circular-symmetric primary torque receiving surfaces (14) and the auxiliary torque receiving means (36) is formed by a section of insertion tool shaft (4) having a non-circular-symmetric crosssection forming a plurality of external non-circular- symmetric auxiliary torque receiving surfaces (37) , wherein the number of primary torque receiving surfaces is different to the number of auxiliary torque receiving surfaces .

6. The driving system according to claim 5, wherein the primary and auxiliary torque receiving surfaces (14, 37) are planar and angularly spaced about the longitudinal axis in a uniform manner to form polygonal cross- sectional shapes with a differing number of sides.A23885WO / 29.09.20257. The driving system according to any preceding claim, wherein the uni-directional drive means (70) enables torque to be transmitted to the auxiliary drive tool (52) in a counter-clockwise direction only.

8. The driving system according to any preceding claim, wherein the uni-directional drive means (70) of the auxiliary drive tool (52) forms a ratchet wheel.

9. The driving system according to any preceding claim, wherein the uni-directional drive means (70) comprises a plurality of circumferentially spaced drive surfaces (74) , each drive surface extending substantially in or parallel to a radial plane, the plurality of drive surfaces facing in a single rotational direction, the uni-directional drive means (70) further comprising a plurality of release surfaces (76) interposed between the drive surfaces (74) , wherein each release surface (76) faces one of the plurality of drive surfaces (74) to form a pair, the release surfaces (76) therefore facing in the opposite rotational direction to the drive surfaces (74) , the release surface (76) of each pair tapering away from its paired drive surface (74) in a radially outwards direction .

10. The driving system according to claim 9, wherein each pair of drive and release surfaces (74, 76) are formed as grooves or notches recessed in the auxiliary drive tool shaft .

11. The driving system according to any preceding claim, further comprising a primary drive tool (82) , the primaryA23885WO / 29.09.2025drive tool having a drive tool shaft (83) extending along a longitudinal axis L' ' from a proximal end (81) to a distal end and comprising in its distal end region a third torque applying means (88) , the third torque applying means being adapted to engage with the primary torque receiving means (12) of the insertion tool (4) in a torque transmitting manner but not the auxiliary torque receiving means (36) of the insertion tool (4) , the drive tool shaft (83) further comprising, in its proximal end region, a drive means (100) which enables torque to be transmitted to the primary drive tool (82) .

12. The driving system according to claim 11, wherein the primary torque receiving means (12) is formed by a section of the insertion tool shaft (4) comprising a plurality of external planar primary torque receiving surfaces (14) angularly spaced about the longitudinal axis in a uniform manner to form a polygonal cross-sectional shape and the third torque applying means (88) is formed by a hollow sleeve (90) in the primary drive tool shaft (83) comprising a plurality of internal planar torque applying surfaces (94) angularly spaced about the longitudinal axis in a uniform manner to form a polygonal cross- sectional shape having an equal number of sides to the polygonal cross-sectional shape of the primary torque receiving means (12) .

13. A dental insertion tool (2) for the system according to any of claims 1 to 12, for transmitting torque from a drive tool to a dental implant (80) , the dental insertion tool (2) comprising an insertion tool shaft (4) extending along a longitudinal axis L from a coronal end (6) to anA23885WO / 29.09.202543 apical end (8) and comprising, in its apical end region, a dental implant engagement section (18) , which comprises a first torque applying means (20) adapted for engaging the dental implant in a torque transmitting manner, the insertion tool shaft (4) further comprising, in its coronal end region, a drive tool engagement section (10) , which comprises a primary torque receiving means (12) adapted for engaging a primary drive tool in a torque transmitting manner, the insertion tool shaft (4) further comprising a break zone (32) arranged between the drive tool engagement section (10) and the dental implant engagement section (18) , said break zone being designed to break upon application of a predetermined amount of torque, the insertion tool shaft (4) further comprising, between the break zone (32) and the first torque applying means (20) , an auxiliary torque receiving means (36) adapted for engaging an auxiliary drive tool (52) in a torque transmitting manner, wherein the primary torque receiving means (12) and the auxiliary torque receiving means (36) have cross-sections in a plane perpendicular to the longitudinal axis L, which are different to one another in shape and / or in size.

14. An auxiliary drive tool (52) for the system according to any of claims 1 to 12 for transmitting torque to a dental insertion tool (2) in a single rotational direction, the auxiliary drive tool (52) comprising a drive tool shaft (54) extending along a longitudinal axis L' from a proximal end (56) to a distal end (58) , and comprising, in its distal end region, a second torque applying means (60) adapted to engage with an auxiliary torque receivingA23885WO / 29.09.202544 means (36) of the insertion tool (2) in a torque transmitting manner, the second torque applying means (60) being formed by a hollow sleeve (62) of the drive tool shaft (54) , the internal surface of the sleeve having a non-circular-symmetric cross-section in a plane perpendicular to the longitudinal axis L' which forms at least one non-circular symmetric torque applying surface (64) , wherein the drive tool shaft (54) further comprises, in its proximal end region, a uni-directional drive means (70) which enables torque to be transmitted to the auxiliary drive tool (52) in a single rotational direction, the uni-directional drive means (70) comprising a plurality of circumferentially spaced drive surfaces (74) , each drive surface (74) extending substantially in or parallel to a radial plane, the plurality of drive surfaces (74) facing in a single rotational direction, the uni-directional drive means (70) further comprising a plurality of release surfaces (76) interposed between the drive surfaces (74) , wherein each release surface (76) faces one of the plurality of drive surfaces (74) to form a pair, the release surfaces (76) therefore facing in the opposite rotational direction to the drive surfaces (74) , the release surface (76) of each pair tapering away from its paired drive surface (74) in a radially outwards direction.A23885WO / 29.09.2025

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