Dental orthodontic device

Abstract

The orthodontic appliance (100) comprises a biasing member (105) configured to bias the appliance (100) in a contracted configuration; a first anchor (101) configured to couple at a distal end (121) to a first attachment member or to a first location within a patient's mouth; and a second anchor (102) configured to couple at a distal end (141) to a second attachment member or to a second location within a patient's mouth. The first and second anchors each have a first or proximal portion (110), (130) and a second or distal portion (120), (140). The first or proximal portion of the first anchor extends in a first longitudinal direction at least when the biasing device is in a relaxed or contracted configuration, and the first or proximal portion of the second anchor extends in a third longitudinal direction at least when the biasing device is in a relaxed or contracted configuration.

Description

【Technical Field】 【0001】 Embodiments of the present invention relate to an orthodontic device, and more particularly, but not limited to, an orthodontic device and a corresponding method for applying a biasing force between two ends of the device. 【Background Art】 【0002】 The correction of malocclusion typically involves the use of one or more types of orthodontic devices. Many of these devices are designed to apply forces between multiple locations in the oral cavity where the device is fixed, typically between teeth. 【0003】 Orthodontic devices using elastic materials such as rubber bands are widely used to apply forces between teeth. However, such elastic materials have the disadvantage of being prone to deformation over time, and therefore these devices need to be replaced relatively frequently, sometimes daily. And the replacement often relies on the patient, and the amount of control that an orthodontist can exercise throughout the treatment is small. Furthermore, elastic materials lose their elastic properties if stretched beyond their limits. 【0004】 An example of an orthodontic device that exerts a biasing force and does not tend to lose its elastic properties through permanent deformation is described in International Publication No. 2016 / 169881 (Abels et al.), which is hereby incorporated by reference in its entirety. 【0005】 As other examples of orthodontic devices that use inelastic biasing means to impart a biasing force, U.S. Patent No. 5,312,247 (Sachdeva et al.), U.S. Patent No. 3,772,789 (De Weoskin), and U.S. Patent Application Publication No. 2012 / 058444 (Allesee) are mentioned, and the entireties of them are incorporated herein by reference. However, these devices have a number of drawbacks. For example, the movement during extension and pressurization of the device is typically only permitted or designed to act in only one direction. However, the movement between anchor points during opening and closing of the patient's mouth typically does not act in only one direction, especially when the anchor points are located on different mandibular teeth, for example, between an upper molar and a mandibular canine, or vice versa. This subjects the device to stress and often leads to damage or malfunction of the device. In addition, when adjustment of the device is required, for example, when the length of the device, or the force imparted by the device, needs to be adjusted by an orthodontist during treatment. Typically, achieving an appropriate level of adjustment depends on the orthodontist's expertise. This can be accomplished by reducing the length of the wire and tightening a part of the device, such as a screw. In this subjective approach, it is difficult to provide an accurate and reliable means of adjusting the length of the device or the force imparted by the device during adjustment. 【0006】 Additional examples of orthodontic devices include International Publication No. 03 / 009769 (Cleary), International Publication No. 2014 / 130870 (Radmall et al.), U.S. Patent Application Publication No. 2013 / 130190 (Lewis), and U.S. Patent No. 4,708,646 (Jasper). 【0007】 Furthermore, dental devices are typically designed to be positioned such that the patient can normally open and close their mouth. Typically, the dental device is positioned such that, for example, during biting, the patient's lower jaw can close without interference between the device and the patient's teeth at the occlusal position. This typically means that the device is placed sufficiently far from the patient's teeth when the patient's mouth is closed. However, when the patient opens their mouth, their cheek typically moves closer to the teeth and thus to the device, causing discomfort and, in some cases, potential injury. 【0008】 Generally, such devices are distinguished into push-type devices and pull-type devices. The device of the present invention belongs to the group of pull-type devices. 【0009】 An object of the present invention is to reduce or alleviate one or more of the drawbacks associated with the prior art. 【Summary of the Invention】 【0010】 According to a first aspect of the present invention, there is provided an orthodontic device comprising a biasing device, the biasing device being configured to bias the device in a contracted form, the biasing device being at a distal end, a first anchor configured to connect to a first attachment member or to a first position within the patient's mouth, the first anchor having a first or proximal portion including a proximal end and a second or distal portion including a distal end; at a distal end, a second anchor configured to connect to a second attachment member or to a second position within the patient's mouth, the first anchor having a first or proximal portion including a proximal end and a second or distal portion including a distal end; a biasing member provided between the proximal end of the first anchor and the proximal end of the second anchor such that the first or proximal portion of the first anchor and the first or proximal portion of the second anchor overlap; and The first or proximal portion of the first anchor extends in a first longitudinal direction, at least when the biasing device is in a relaxed or contracted configuration, and the first or proximal portion of the second anchor extends in a third longitudinal direction, at least when the biasing device is in a relaxed or contracted configuration. The second or distal portion of the first anchor is substantially planar and extends in a second direction different from the first longitudinal direction of its respective first or proximal portion in a second plane, and the second or distal portion of the second anchor is substantially planar and extends in a fourth direction different from the third longitudinal direction of its respective first or proximal portion in a fourth plane. A device is provided where the second plane is different from the fourth plane. 【0011】 The second plane and the fourth plane may not be parallel to each other. 【0012】 The second plane and the fourth plane may be, at least when the device is in a relaxed or contracted configuration, about 10 to 90°, for example, about 45 to 90°, for example, about 60 to 90°, typically about 90° with respect to each other. 【0013】 By having the second or distal portions of the first and second anchors extending in different planes, the likelihood of contact between the device, e.g., the second or distal end, and each point of contact within the patient's mouth, e.g., the first attachment member or the first position and / or the second attachment member or the second position, is reduced. This can assist in positioning the device within the patient's mouth and / or reducing contact between the device, e.g., the first and / or second anchors, and their respective first attachment members or first positions and / or second attachment members or second positions, for example during positioning. In particular, during use, this configuration causes the first distal portion (e.g., connected to the maxillary canine) to be substantially horizontal or parallel to the occlusal plane, such that the area at risk of contact with orthodontic brackets and other devices is reduced, the labial position of the device is lowered, and contact with the patient's cheek can be reduced. Also, this configuration causes the second distal portion (e.g., connected to the mandibular molar) to be oriented substantially vertically or substantially perpendicular to the occlusal plane, reducing the risk of cheek contact and / or inflammation. 【0014】 By having the second or distal portion of the first anchor extending in a first direction different from the direction of its respective first or proximal portion, and the second or distal portion of the second anchor extending in a second direction different from the direction of its respective first or proximal portion, during use, e.g., in a closed or contracted configuration, when the second or distal portion of the first anchor and / or the second or distal portion of the second anchor are attached to their respective attachment members or to respective positions within the patient's mouth, the biasing device, e.g., its central region, may be provided away from the patient's teeth, gingiva, and / or mandible. Such a configuration enables the device to be directly attachable to the patient's dental brackets, i.e., the connector between the device, e.g., the anchor, and the patient's dental bracket or wire may be unnecessary. 【0015】 The term "relaxed or contracted configuration" means that the biasing device is in an inactive configuration, i.e., the biasing member is not under stress, e.g., not under pressure. In such a configuration, the device does not have to exert a tensile force between the second or distal portion of the first anchor and the second or distal portion of the second anchor. Thus, the device may be considered to be "contracted" in the sense that the second or distal portions are closer together, i.e., the overall length of the device is shorter than the overall length in the "active or extended configuration". 【0016】 The term "active or extended configuration" means that the biasing device is in an active configuration, i.e., the biasing member is under stress, e.g., under pressure. In such a configuration, typically when the patient opens their mouth, the device may exert a tensile force between the second or distal portion of the first anchor and the second or distal portion of the second anchor. Thus, the device may be considered to be "extended" in the sense that the second or distal portions are further apart, i.e., the overall length of the device is longer than the overall length in the "relaxed or contracted configuration". 【0017】 At least a portion of the first anchor and / or at least a portion of the second anchor may be substantially planar and / or flat, at least in the relaxed or contracted configuration. 【0018】 As used herein, the term "substantially planar and / or flat" is understood to include both a geometric (flat) plane and a slightly curved plane, e.g., a plane having a curved surface within the range of 0 to 5°, e.g., 0 to 3°. Thus, the functional plane may be a geometric (flat) plane or a slightly curved plane, e.g., a plane having a curved surface within the range of 0 to 5°, e.g., 0 to 3°. 【0019】 As described above, the second or distal portion of the first anchor extends in a second plane. The second or distal portion of the first anchor may be substantially planar and / or flat. 【0020】 The first or proximal portion of the first anchor may extend in a first plane. At least one side surface of the first or proximal portion of the first anchor may be substantially planar and / or flat. One side surface of the first or proximal portion of the first anchor facing the second anchor may be substantially planar and / or flat. 【0021】 The first plane and the second plane may be parallel and / or identical in the final relaxed or contracted configuration. In such a case, the first or proximal portion and the second or distal portion of the first anchor may extend in a common plane, at least in the relaxed or contracted configuration. 【0022】 As described above, the second or distal portion of the second anchor extends in a fourth plane. The second or distal portion of the second anchor may be substantially planar and / or flat. 【0023】 At least one side surface of the first or proximal portion of the second anchor may be substantially planar and / or flat and / or may extend in a third plane. One side surface of the first or proximal portion of the second anchor facing the first anchor may be substantially planar and / or flat. 【0024】 In use, when the device is in the relaxed or contracted configuration, the first direction and the third direction may be substantially aligned and / or parallel. In other words, when the device is in the relaxed or contracted configuration, the first or proximal portion of the first anchor and the first or proximal portion of the second anchor may be substantially aligned. 【0025】 The first plane and the third plane may be parallel and / or may be identical, at least in a relaxed or contracted configuration. In such a case, the first or proximal portion of the first anchor and the first or proximal portion of the second anchor may each, for example, extend in the first plane and the third plane, respectively, by stretching the plane. The first plane and the third plane may be parallel and / or may be adjacent to each other, typically parallel and adjacent to each other. 【0026】 The first or proximal portion of the first anchor and the first or proximal portion of the second anchor may be configured to contact each other and / or slide parallel to each other longitudinally, for example, along a flat surface. 【0027】 The third plane and the fourth plane may not be parallel and / or may not be identical in a finally relaxed or contracted configuration. In such a case, the first or proximal portion and the second or distal portion of the second anchor may extend in different planes in a finally relaxed or contracted configuration. The third plane and the fourth plane may be at an angle of about 10 - 90°, for example, about 45 - 90°, for example, about 60 - 90°, typically about 90° with respect to each other, at least when the device is in a relaxed or contracted configuration. 【0028】 Advantageously, the present configuration enables the second or distal portions of the first and second anchors that extend in different planes (which, as described above, can reduce unwanted contacts and / or assist in the installation of the device), while engaging the respective first or proximal portions with each other, and / or sliding them parallel to each other, for example, via their flat surfaces. This allows at least a central region of the device or the biasing device, for example, a part of the device in the region of the biasing member, to be bent, curved, or deformed when the device is in an active or extended configuration. During use, this allows the movement of the proximal end of the first anchor and / or the proximal end of the second anchor inwardly and / or towards the patient's dental arch when in an active or extended configuration. Such a provision reduces the likelihood of interference between the patient's cheek and the device in its active form, for example, when the patient opens their mouth, since the device is configured to move inwardly, for example, away from the patient's cheek. Further, by enabling such deformation, the device, for example, the biasing device, can deform in the general direction of the tensile force between the second or distal portions or between the first and second anchors, reducing the risk of damage or breakage of the device. 【0029】 The first and third planes need not be parallel and / or need not be the same, at least in a relaxed or contracted configuration. In such a case, the first or proximal portions of the first and second anchors may each extend in a plurality of planes, for example, in the first and third planes respectively. The first and third planes need not be parallel to each other and may, for example, be perpendicular to each other. 【0030】 The first or proximal portion of the first anchor and the first or proximal portion of the second anchor may be configured to engage with each other, for example, by complementary or interlocking configurations. For example, the first or proximal portion of the first anchor may comprise a groove configured to receive at least a portion of the first or proximal portion of the second anchor. Alternatively, or additionally, the first or proximal portion of the second anchor may comprise a groove configured to receive at least a portion of the first or proximal portion of the first anchor. Such a configuration may increase the rigidity of the device in the region of the proximal portions of the first and second anchors, for example, in a portion of the device in the region of the biasing member when in the active or extended form. 【0031】 The third and fourth planes may be parallel and / or identical, at least in the relaxed or contracted form. In such a case, the first or proximal portion and the second or distal portion of the second anchor may extend in the same plane, at least in the relaxed or contracted form. 【0032】 Advantageously, the present configuration enables the second or distal portions of the first and second anchors to extend in different planes (which, as described above, may reduce unwanted contact and / or assist in the installation of the device), while allowing the respective first or proximal portions to engage with each other, for example, via complementary or interlocking mechanisms. The region of the device or biasing device, for example, one or more distal portions of the device, may be configured to bend, curve, or deform when the device is in the active or extended form. 【0033】 As described above, since the distal ends of the first anchor and the second anchor are not aligned with the first or proximal portion of the first anchor and the second anchor, when activated, for example, when the biasing member is pressurized, the tensile force brought about between the distal end of the first anchor and the distal end of the second anchor causes one or more parts of the device, such as the proximal and / or distal portions of the anchor, to move such that the central part of the device moves towards a line extending between the first distal end and the second distal end and / or towards a line representing the tensile force applied to the device. 【0034】 Advantageously, at least the first or proximal portion of the first anchor and the second anchor may be made of a flexible material. The flexible material may be a shape memory material, such as a shape memory metal like nitinol. This allows, when the device is in the active or extended form, a part of the device in the central region of the device or the biasing device, such as the region of the biasing member, to be bent, curved, or deformed. In use, this allows the movement of the proximal end of the first anchor and / or the proximal end of the second anchor towards the inside and / or towards the patient's dental arch when in the active or extended form. Such a provision reduces the likelihood of interference between the patient's cheek and the device in the active form, for example, when the patient opens their mouth, since the device is configured to move towards the inside, for example, away from the patient's cheek. Furthermore, by enabling such deformation, the device, such as the biasing device, can deform in the general direction of the tensile force between the second or distal parts or between the first anchor and the second anchor, reducing the risk of damage or breakage of the device. This also allows the movement of the central region of the device away from the parts of the patient's mouth when activated. 【0035】 One or more of the second or distal portions of the first anchor and the second or distal portions of the second anchor, typically, the second or distal portions of the first anchor and the second or distal portions of the second anchor, may be made of a flexible material. The flexible material may be a shape memory material, such as a shape memory metal like nitinol. This allows the distal portions of the first and second anchors to be bent, curved, or deformed when the device is in an active or extended configuration. This can be particularly advantageous when the first or proximal portions of the first anchor and the first or proximal portions of the second anchor are configured to engage with each other, for example, by complementary or interlocking mechanisms, as the flexibility or bending ability of the central region of the device may then be reduced. 【0036】 Accordingly, in an embodiment of the first aspect, an orthodontic device comprising a biasing device, the biasing device being configured to bias the device in a contracted configuration, the biasing device a biasing member, and a first anchor configured to connect at a distal end to a first attachment member or at a first location within a patient's mouth, and a second anchor configured to connect at a distal end to a second attachment member or at a second location within a patient's mouth wherein the first anchor and the second anchor each have a first or proximal portion and a second or distal portion, the first or proximal portion of the first anchor extends in a first longitudinal direction at least when the biasing device is in a relaxed or contracted configuration, and the first or proximal portion of the second anchor extends in a third longitudinal direction at least when the biasing device is in a relaxed or contracted configuration, the second or distal portion of the first anchor extends in a second direction different from the first longitudinal direction of its respective first or proximal portion in a second plane, and the second or distal portion of the second anchor extends in a fourth direction different from the third longitudinal direction of its respective first or proximal portion in a fourth plane, the second plane is different from the fourth plane, ​An apparatus is provided in which the first or proximal portion of the first anchor and the first or proximal portion of the second anchor are made of a flexible material. 【0037】 The second or distal portion of the first anchor and the second or distal portion of the second anchor may be made of a flexible material. 【0038】 The flexible material may be a shape memory material, such as a shape memory metal or alloy like nitinol, or a combination of a shape memory metal and a resin. By such a provision, when an orthodontic device, such as an actuating device, moves to an open or extended configuration, the first anchor and / or the second anchor may receive a force that aligns the first anchor and / or the second anchor along the direction of the force in the direction between the first attachment member and the second attachment member. By using a deformable and / or shape memory material, the first anchor and / or the second anchor can return to their initial, bent shape in a closed or contracted configuration, thereby avoiding interference with the patient's soft tissue even after the patient's mouth has been opened and closed for a number of cycles. This can be particularly advantageous when the first attachment member is defined by the first position or its components and / or when the second attachment member is defined by the second position or a part of its components, for example, when the first attachment member and / or the second attachment member are not provided as separate or distinct parts. In such cases, the stress applied to the device while the subject's mouth is open can be compensated, for example, by a temporary deformation of the elastic material of the first anchor and / or the second anchor. This can help to minimize damage to the device and / or extend the life of the device. 【0039】 According to a second aspect, there is provided an orthodontic device comprising an actuating device, the actuating device being configured to actuate the device in a contracted configuration, the actuating device comprising an actuating member, and a first anchor configured to connect at a distal end to the first attachment member or to a first position within the patient's mouth, and At the distal end, a second anchor configured to connect to a second attachment member or to a second location within the patient's mouth, and comprising The first and second anchors each have a first or proximal portion and a second or distal portion, The first or proximal portion of the first anchor extends in a first longitudinal direction, at least when the biasing device is in a relaxed or contracted configuration, and the first or proximal portion of the second anchor extends in a third longitudinal direction, at least when the biasing device is in a relaxed or contracted configuration, The second or distal portion of the first anchor extends in a second direction different from the first longitudinal direction of its respective first or proximal portion in a second plane, and the second or distal portion of the second anchor extends in a fourth direction different from the third longitudinal direction of its respective first or proximal portion in a fourth plane, There is provided an apparatus in which the first or proximal portion of the first anchor and the first or proximal portion of the second anchor are made of a flexible material. 【0040】 The second or distal portion of the first anchor and the second or distal portion of the second anchor may be made of a flexible material. 【0041】 The flexible material may be a shape memory material, such as a shape memory metal or alloy, e.g., nitinol, or a combination of a shape memory metal and a resin. 【0042】 The second plane may be different from the fourth plane. 【0043】 The features described in connection with the apparatus of the first aspect may be equally applicable to the apparatus of the second aspect and are not repeated here for the sake of brevity. 【0044】 The following features may be applicable to any aspect of the present invention. 【0045】 The first anchor may have a first or proximal portion extending from a first end towards a second or distal end, and a second or distal portion extending from the second or distal end towards the first or proximal end. The first or proximal portion of the first anchor extends in a first longitudinal direction. 【0046】 The first direction may be a substantially linear direction. As used herein, the term "substantially linear" is understood to include both a geometric (straight line) direction and a slightly curved direction, e.g., a direction extending along a curved surface within a range of 0 to 5°, e.g., 0 to 3° from a straight line. 【0047】 The second or distal portion of the first anchor extends in a second direction. The second direction may be a substantially linear direction. The second or distal portion may be curved. The second or distal portion of the first anchor may extend in the second direction substantially linearly, curved, or stepped. 【0048】 As described above, the first direction and the second direction are different. 【0049】 The first direction and the second direction may extend at an angle to each other, e.g., at an angle of about 5 to 90°, e.g., about 10 to 80°, typically about 20 to 70°. 【0050】 The first anchor may have an intermediate portion between the first or proximal portion and the second or distal portion. The intermediate portion may provide a transition region between the first or proximal portion and the second or distal portion. For example, the intermediate portion may be curved. The intermediate portion may be provided in a first plane, a second plane, or an intermediate plane. Alternatively, the first or proximal portion may be directly integrated with the second or distal portion. 【0051】 The second anchor may have a first or proximal portion extending from its first or proximal end towards its second or distal end, and a second or distal portion extending from its second or distal end towards its first or proximal end. The first or proximal portion of the second anchor extends in a third direction. 【0052】 The third direction may be a substantially linear direction. As used herein, the term "substantially linear" is understood to include a geometric (straight-line) direction and a slightly curved direction, e.g., a direction extending along a curved surface within a range of 0 to 5°, e.g., 0 to 3° from a straight line. 【0053】 The second or distal portion of the second anchor extends in a fourth direction. The fourth direction may be a substantially linear direction. The second or distal portion of the second anchor may be curved. The second or distal portion of the second anchor may extend in a substantially linear, curved, or stepped manner in a second direction. 【0054】 The third direction and the fourth direction may extend obliquely to each other, e.g., at an angle of about 5 to 90°, e.g., about 10 to 80°, typically about 20 to 70°. 【0055】 The second anchor may have an intermediate portion between the first or proximal portion and the second or distal portion. The intermediate portion may provide a transition region between the first or proximal portion and the second or distal portion. For example, the intermediate portion may be curved. The intermediate portion may be provided in a third plane, a fourth plane, or an intermediate plane. Alternatively, the first or proximal portion may be directly integrated with the second or distal portion. 【0056】 The first or proximal end of the first anchor may extend beyond the first or proximal end of the second anchor. The first or proximal end of the second anchor may extend beyond the first or proximal end of the first anchor. In other words, the device may include a region where the first or proximal portion of the first anchor and the first or proximal portion of the second anchor overlap, e.g., a central region thereof. 【0057】 The first or proximal end of the first anchor may extend beyond the biasing member. 【0058】 The first or proximal end of the second anchor may extend beyond the biasing member. 【0059】 The biasing member may be provided between the first or proximal end of the first anchor and the first or proximal end of the second anchor. 【0060】 The device may include a first catch configured to engage a first end of the biasing member. The device may include a second catch configured to engage a second end of the biasing member. The biasing member may be provided between the first catch and the second catch. 【0061】 The first catch and / or the second catch may be provided in the form of a hook, shoulder, protrusion, or the like. 【0062】 The biasing member may be provided between the first or proximal portion of the first anchor and the first or proximal portion of the second anchor, for example, between the first catch and the second catch. 【0063】 Thus, the biasing member may function as a guide to maintain the first or proximal portion of the first anchor and the first or proximal portion of the second anchor in contact with each other, engaged with each other, or in very close proximity to each other, for example. 【0064】 The first or proximal portion of the first anchor may extend through the biasing member. 【0065】 The first or proximal portion of the second anchor may extend through the biasing member. 【0066】 In use, during extension, for example, when pulling the distal ends of the first anchor and the second anchor, the first or proximal end of the first anchor, for example, the first catch, and the first or proximal end of the second anchor, for example, the second catch, may apply forces to both ends of the biasing member therebetween, applying a compressive force to the biasing member. 【0067】 Typically, the biasing member may comprise a spring or may be a spring. 【0068】 The biasing member may include a helical spring or may be a helical spring. 【0069】 The biasing member may be made of metal. 【0070】 The biasing member may include a metal spring or may be a metal spring. The biasing member may be made of a shape memory material, such as a shape memory metal or alloy like nitinol, or a combination of a shape memory metal and a resin. 【0071】 The biasing member may exert a biasing force under pressure. 【0072】 The first anchor may be inelastic. The first anchor may be made of metal. 【0073】 The second anchor may be inelastic. The second anchor may be made of metal. 【0074】 The biasing member may include a limiter for preventing movement of the biasing member beyond a predetermined limit. 【0075】 The biasing member may exert a biasing force in a linear direction. 【0076】 The limiter may be defined by the maximum pressure of the biasing member. The limiter may be the biasing member, such as a helical spring. 【0077】 The biasing member may generally extend in the longitudinal direction, for example, generally along its longitudinal axis. The biasing member may have a first end and a second end. 【0078】 The first anchor, for example, its first or proximal portion, may extend along, for example, through the biasing member. The second anchor, for example, its first or proximal portion, may extend along, for example, through the biasing member. By such a provision, during use, the first anchor and / or the second anchor may exert a pressing force on the biasing member. The biasing device may thus be capable of applying or exerting a tensile force when the biasing member is under pressure. The tensile force is necessary for the treatment of certain types of malocclusion. 【0079】 Specific and alternative features of such biasing members, biasing devices, and / or limiters are described in International Publication No. WO 2016 / 169881 (Abels et al.), which is hereby incorporated by reference in its entirety. 【0080】 The biasing member may comprise a helical spring having a plurality of coils. 【0081】 The limiter may comprise coils of the spring that are arranged in contact with each other when the helical spring is pressurized, or may be defined by the coils of the spring. 【0082】 The device may comprise a first attachment member for attaching the biasing device to a first position within the patient's mouth, and / or a second attachment member for attaching the biasing device to a second position within the patient's mouth. 【0083】 The first anchor may comprise a plurality of connection elements for connecting to the first attachment member. The second anchor may comprise a plurality of connection elements for connecting to the second attachment member. 【0084】 Typically, the first position and / or the second position may include the first tooth and / or the second tooth. However, depending on the type of tooth in question, the first position and / or the second position may include conventional means for attaching the orthodontic device to a patient's tooth or a portion of the patient's tooth tissue, such as brackets, molar bands, dental wires extending between brackets or bands, bracket tools such as pins, and the like, which will be understood to include dental appliances. 【0085】 By means of the connection element, the length of the first anchor and / or the length of the second anchor can be adjusted, for example, with respect to their respective attachment members. For example, the first anchor may be connected to the first attachment member via one of a plurality of connection elements in a first configuration, and the first anchor may be connected to the first attachment member via a different connection element in a second, tighter, configuration. Similarly, the second anchor may be connected to the second attachment member via one of a plurality of connection elements in a first configuration, and the second anchor may be connected to the second attachment member via a different connection element in a second, shorter, configuration. 【0086】 The connection element may comprise one or more of an opening, a hole, a groove, a tooth, a notch, a scale, an interlocking ring, or a combination thereof. In one embodiment, the connection element may comprise a plurality of holes in the first anchor and / or in the second anchor. 【0087】 In use, the first anchor may be connected to the first attachment member via one of a plurality of connection elements. Typically, the first anchor may be connected to the first attachment member, for example, with respect to a biasing member and / or with respect to the second anchor, via the most distal connection element, for example, a connection element located at the distal end of the first anchor or a connection element near the distal end of the first anchor. This can avoid a portion of the first anchor extending beyond or protruding beyond the first attachment member, for example, towards the patient's tooth or gingiva, and can minimize the risk of patient discomfort or injury. 【0088】 In use, the second anchor may be connected to the second attachment member via one of a plurality of connection elements. Typically, the second anchor may be connected to the second attachment member via, for example, the most distal connection element with respect to the biasing member and / or with respect to the first anchor, such as a connection element located at the distal end of the second anchor or a connection element near the distal end of the second anchor. This may prevent a portion of the second anchor from extending or protruding beyond the second attachment member, for example, towards the patient's tooth or gingiva, minimizing the risk of patient discomfort or injury. 【0089】 The connection elements may be spaced apart, for example, in the first anchor and / or in the second anchor, such as in its second or distal portion, and may be spaced apart longitudinally. The connection elements may be longitudinally aligned, for example, spaced apart along the longitudinal direction of the first anchor and / or along the longitudinal direction of the second anchor. Advantageously, the connection elements may be spaced apart at a predetermined interval. Such a provision may improve the adjustment of the length of the orthodontic device and / or the biasing device, for example, by adjusting the length of one or both of the first anchor and the second anchor. In particular, this configuration enables the user to reliably adjust the length of the first anchor and / or the second anchor by a known distance, thereby improving the speed of the adjustment procedure, the reliability, accuracy, and / or the quality of the treatment, and reducing the need for expert knowledge in tension adjustment. 【0090】 The connection elements may be equally spaced. The connection elements may be spaced at irregular intervals, for example, at progressive intervals (such as decreasing or increasing). It will be understood that the specific pattern defined by the connection elements and the way the connection elements are specifically provided are determined by the specific treatment required for a particular patient or subject and the intended level of adjustment. Conveniently, the connection elements may be equally spaced. 【0091】 The first attachment member for attaching the biasing device to a first position within the patient's oral cavity may be configured to allow movement of the first anchor relative to the first position. 【0092】 The second attachment member for attaching the biasing device to a second position within the patient's oral cavity may be configured to allow movement of the second anchor relative to the second position. 【0093】 The first attachment member may be configured to allow movement of the first anchor relative to the first position in at least two degrees of freedom. 【0094】 The second attachment member may be configured to allow movement of the second anchor relative to the second position in at least two degrees of freedom. 【0095】 The first attachment member may include a first body that is arranged to connect to the first anchor and to the first position. 【0096】 The first attachment member may allow, for example, rotation and / or pivoting movement about an axis extending along a distal medial direction or about an axis extending tangentially to the distal medial direction, relative to their respective first positions. By such provisions, the orthodontic device and / or the biasing device may be movable, during use, for example, when the subject closes or opens their mouth, towards or away from the first position. 【0097】 During use, the first body may be connected to the first position via a movable connection, such as a pivot or hinge. Typically, during use, the body may be pivotally or hingedly connected to the first position about an axis extending along a distal medial direction or about an axis extending tangentially to the distal medial direction. Advantageously, the first attachment member, for example, its first body, may be pivotally or hingedly connectable to an archwire. 【0098】 The first attachment member may, for example, enable rotation and / or pivoting movement relative to the first anchor about an axis perpendicular to the longitudinal axis of the first anchor. Such a provision may enable the orthodontic device and / or the biasing device to be pivotable during use, for example, when the subject closes or opens their mouth. This can help reduce the risk of malfunction or breakage of the device, for example, of the biasing device, due to reduced bending and stress in the device. 【0099】 The first body may be connected to the first anchor via a movable connection, such as a pivot. Typically, the body may be pivotally connected to the first anchor about an axis perpendicular to the longitudinal axis of the first anchor. 【0100】 The second attachment member may comprise a body arranged to connect to the second anchor and at the second position. 【0101】 The second attachment member may, for example, enable rotation and / or pivoting movement relative to its respective second position about an axis extending in the distal medial direction or about an axis tangent to the distal medial direction. Such a provision may enable the orthodontic device and / or the biasing device to be movable closer to or away from the second position during use, for example, when the subject closes or opens their mouth. 【0102】 The second body may be connected to the second position via a movable connection, such as a pivot or a hinge. Typically, the body may be pivotally or hingedly connected to the second position about an axis extending in the distal medial direction or about an axis tangent to the distal medial direction. Advantageously, the second attachment member, for example, its second body, may be pivotally or hingedly connectable to the archwire. 【0103】 The second attachment member may, for example, enable rotation and / or pivoting movement relative to the second anchor about an axis perpendicular to the longitudinal axis of the second anchor. Such a provision may enable the orthodontic device and / or the biasing device to be pivotable during use, for example, when the subject closes or opens their mouth. This can help reduce the risk of malfunction or breakage of the device, for example, of the biasing device, due to reduced bending and stress in the device. 【0104】 The second body may be connected to the second anchor via a movable connection, such as a pivot. Typically, the body may be pivotally connected to the second anchor about an axis perpendicular to the longitudinal axis of the second anchor. 【0105】 In this way, the first body and / or the second body may function as a spacer movable to its first position or second position, for example, relative to their respective first anchor or second anchor. 【0106】 In an alternative embodiment, the first attachment member may form the first position or a part of that component, and / or the second attachment member may form the second position or a part of that component. In such a case, the first anchor may be directly connected to a dental appliance at the first position, such as a bracket, molar band, dental wire extending between brackets or bands, bracket tool such as a pin, etc., and / or the second anchor may be directly connected to a dental appliance at the second position, such as a bracket, molar band, dental wire extending between brackets or bands, bracket tool such as a pin, etc. 【0107】 The first position and / or the second position, e.g., brackets, molar bands, dental wires extending between brackets or bands, bracket tools, e.g., pins, etc., may each comprise a first attachment member and / or a second attachment member. The first position and / or the second position, e.g., brackets, may comprise a pivot, e.g., a vertical pivot and any associated fastening means, which may provide one or more functions related to the first attachment member or the second attachment member described above. 【0108】 Embodiments of the present invention will be described with reference to the accompanying drawings. 【Brief Description of the Drawings】 【0109】 【Figure 1】 Shows an orthodontic device according to a first embodiment. 【Figure 2】 Shows an orthodontic device according to a first embodiment. 【Figure 3】 Shows an orthodontic device according to a first embodiment. 【Figure 4】 Shows an orthodontic device according to a first embodiment. 【Figure 5】 Shows an orthodontic device according to a first embodiment. 【Figure 6】 Shows an orthodontic device according to a first embodiment. 【Figure 7】 Shows an orthodontic device according to a second embodiment. 【Figure 8】 Shows an orthodontic device according to a second embodiment. 【Figure 9】 Shows an orthodontic device according to a second embodiment. 【Figure 10】 Shows an orthodontic device according to a second embodiment. 【Figure 11】 Shows an orthodontic device according to a second embodiment. 【Figure 12】 Shows an orthodontic device according to a third embodiment. 【Figure 13】 Shows an orthodontic device according to a third embodiment. 【Figure 14】Shows an orthodontic device according to the fourth embodiment. 【Figure 15】 Shows an orthodontic device according to the fourth embodiment. 【Figure 16】 Shows an orthodontic device according to the fourth embodiment. 【Mode for Carrying Out the Invention】 【0110】 Figs. 1 to 6 show an orthodontic device 100 according to the first embodiment. 【0111】 The device 100 includes a biasing member 105 configured to bias the device 100 in a contracted form. The device 100 has, at its distal end 121, a first anchor 101 arranged to be connected to a first position in the patient's mouth or to a first attachment member (not shown), and, at its distal end 141, a second anchor 102 configured to be connected to a second position in the patient's mouth or to a second attachment member. 【0112】 The manner in which the biasing member 105 exerts a biasing force on the orthodontic device 100 can take many forms and can follow a number of principles, such as those described in International Publication No. WO 2016 / 169881 (Abels et al.), which is hereby incorporated by reference in its entirety. 【0113】 Fig. 1 shows a perspective view of the device 100 according to the first embodiment, while Figs. 2 and 3 show side and top views thereof, respectively. Fig. 4 shows a perspective view of the device 100 with the biasing member 105 removed for clarity. Figs. 5 and 6 show side and perspective views, respectively, of each of the first anchor 101 and the second anchor 102 to better understand their respective configurations. 【0114】 In the present embodiment, the biasing member 105 is a coil spring. 【0115】 The first anchor 101 has a proximal portion 110 and a distal portion 120. The second anchor 102 has a proximal portion 130 and a distal portion 140. 【0116】 The proximal portion 110 of the first anchor 101 has a proximal end 111, and the distal portion 120 of the first anchor 101 has a distal end 121. The proximal portion 130 of the second anchor 102 has a proximal end 131, and the distal portion 140 of the second anchor 102 has a distal end 141. 【0117】 The first anchor 101 has a proximal portion 110 extending from the proximal end 111 to the distal end 121 and a distal portion 120 extending from the distal end 121 to the proximal end 111. 【0118】 The second anchor 102 has a proximal portion 130 extending from the proximal end 131 to the distal end 141 and a distal portion 140 extending from the distal end 141 to the proximal end 131. 【0119】 The proximal portion 110 of the first anchor 101 extends in a first longitudinal direction, and the distal portion 120 of the first anchor 101 extends in a second direction different from the (first) direction of the proximal portion 110. 【0120】 Similarly, the proximal portion 130 of the second anchor 102 extends in a third longitudinal direction, and the distal portion 140 of the second anchor 102 extends in a fourth direction different from the (third) direction of the proximal portion 130. 【0121】 With such a provision, during use, for example, when the distal portion 120 of the first anchor 101 and the distal portion 140 of the second anchor 102 are attached to their respective attachment members or to their respective positions within the patient's mouth in a closed or contracted form, the central region of the device 100, particularly in the region of the biasing member 105, is provided away from the patient's teeth, gingiva, and / or mandible. With such a configuration, the device 100 can also be directly attached to the patient's dental bracket, that is, the connector between the device 100 and the patient's dental bracket or wire may not be required. 【0122】 As best shown in FIGS. 5 and 6, the proximal portion 110 of the first anchor 101 extends in a first plane, and the distal portion 120 of the first anchor 101 extends in a second plane. In the present embodiment, the first plane and the second plane are the same, and each of the proximal portion 110 and the distal portion 120 of the first anchor 101 is substantially flat / plane. The thickness of the proximal portion 110 and the distal portion 120 of the first portion 101 is about 0.4 mm. The width of the proximal portion 110 of the first portion 101 is about 0.9 mm, and the width of the distal portion 120 of the first portion 101 is about 1 mm. 【0123】 As best shown in FIGS. 5 and 6, the proximal portion 130 of the second anchor 102 extends in a third plane, and the distal portion 140 of the second anchor 102 extends in a fourth plane. Each of the proximal portion 130 and the distal portion 140 of the second anchor 102 is substantially flat / plane. The thickness of the proximal portion 130 of the second portion 102 is about 0.4 mm, and the width is about 0.8 or 0.9 mm. The thickness of the distal portion 140 of the second portion 102 is about 0.8 or 0.9 mm, and the width is about 1 mm. 【0124】 However, in the present embodiment, the third plane and the fourth plane are substantially perpendicular. 【0125】 As a result, during use, that is, when the proximal portions 110, 130 are in contact with each other (as best shown in FIG. 4), the second plane (of the distal portion 120 of the first anchor 101) is different from the fourth plane (of the distal portion 140 of the second anchor 102). In the present embodiment, in the relaxed configuration (as shown in FIGS. 1-3), the second plane and the fourth plane are substantially perpendicular. 【0126】 By having distal portions 120, 140 of a first anchor 101 and a second anchor 102 that extend in different planes, the possibility of contact between the device 100, e.g., the distal ends 120, 140, and respective contact points within the patient's mouth, e.g., a first attachment member or a first position and / or a second attachment member or a second position, is reduced. This can also assist in positioning the device 100 in the patient's mouth and / or reducing contact between the device, e.g., the first anchor 101 and / or the second anchor 102, and their respective first attachment members or first positions and / or second attachment members or second positions, e.g., during positioning. 【0127】 Note that the widths of the proximal portions 110, 130 of the first anchor 101 and the second anchor 102 are substantially equal. The widths of the proximal portions 110, 130 of the first anchor 101 and the second anchor 102 are substantially the same as the thickness of the distal portion 140 of the second anchor 102. This allows the second anchor 102 to be manufactured, e.g., machined, from a single sheet of material, e.g., metal, e.g., nitinol. For example, in this embodiment, the first anchor 101 is machined from a metal sheet having a thickness of 0.4 mm, and the second anchor 102 is machined from a metal sheet having a thickness of 0.9 mm. It will be understood that the precise dimensions described in this example are for illustrative purposes only and are not limiting. 【0128】 The proximal end 111 of the proximal portion 110 of the first anchor 110 extends along the proximal end 131 of the proximal portion 130 of the second anchor 120, beyond the proximal end 131, and beyond the spring 105 (through the spring 105 in this embodiment). The proximal end 135 of the proximal portion 130 of the second anchor 102 extends along the proximal end 111 of the proximal portion 110 of the first anchor 101, beyond the proximal end 111, and beyond the spring 105 (through the spring 105 in this embodiment). In other words, the spring 105 is provided between the proximal end 111 of the proximal portion 110 of the first anchor 101 and the proximal end 131 of the proximal portion 130 of the second anchor 102. 【0129】 In use, when a tensile force is applied to the distal ends 121, 141 of the first anchor 101 and the second anchor 102, the proximal ends 111, 131 of the anchors 101, 102 exert a compressive force on the spring 105. 【0130】 A number of mechanisms may be provided for fixing the proximal ends 111, 131 of the first anchors 101, 102 to the biasing member 105 and / or for ensuring that the proximal ends 111, 131 of the anchors 101, 102 exert a compressive force on the biasing member 105 when a tensile force is applied to their respective distal ends 120, 140. 【0131】 The proximal end 111 of the first anchor 101 and the proximal end 131 of the second anchor 102 may be sized to have a width greater than the width and / or diameter of the spring 105. As shown in FIGS. 1-6, in the present embodiment, the proximal ends 111, 131 of the first anchor 101 and the second anchor 102 each have a hook or enlarged profile 115, 135 that engages with the biasing member 105, for example, at its end. By such a provision, when a tensile force is applied to the first anchor 101 and / or the second anchor 102, a compressive force is brought about on the spring 105. 【0132】 The distal portion 120 of the first anchor 101 has a plurality of connection elements 122 for connecting to a first location within the patient's mouth or to an attachment member. The distal portion 140 of the second anchor 102 has a plurality of connection elements 142 for connecting to a second location within the patient's mouth or to an attachment member. 【0133】 Here, the connection elements 122, 142 are provided in the form of circular openings or holes, but may also be rectangular, rounded square, star-shaped, or of any suitable shape. 【0134】 It will be understood that the connection elements 122, 142 may be provided in other suitable forms and configurations, such as teeth and / or notches, corrugated grooves, interlocking rings, or ratchet mechanisms. 【0135】 In the present embodiment, the connecting elements 122, 142 are provided at longitudinally spaced positions on the distal portions 120, 140 of the respective first anchor 101 and second anchor 102. 【0136】 Advantageously, the connecting elements 122, 142 are provided at a predetermined, constant spacing, which can assist in adjusting the length of the orthodontic device 100. It will be appreciated that in alternative embodiments, the connecting elements 122, 142 may be provided at irregular spacings. The specific pattern defined by the connecting elements 122, 142 and the manner in which the connecting elements 122, 142 are specifically provided will be determined by the specific treatment required for a particular patient or subject and the level of adjustment intended. 【0137】 In use, to adjust the length of the first anchor 101 and / or the second anchor 102, for example, to adjust the tension of the device 100, the first anchor 101 and / or the second anchor 102 are separated from their respective first attachment member and / or second attachment member (not shown) and reconnected to the first attachment member and / or the second attachment member via different, more proximal connecting elements 122, 142. Advantageously, the length of the first anchor 101 and / or the second anchor 102 may be shortened by cutting the first anchor 101 and / or the second anchor 102, for example, extending centrifugally beyond the newly selected connecting elements 122, 142, either before or after reconnecting to their respective first attachment member and / or second attachment member. The device 100 can then be fitted in the patient's mouth by attaching the first attachment member and / or the second attachment member to a desired location in the patient's mouth, such as an archwire. 【0138】 Figures 7 to 11 show the orthodontic appliance 200 according to the second embodiment. The orthodontic appliance 200 in Figures 7 to 11 is generally similar to the appliance 100 of the first embodiment, and similar parts are indicated by numbers incremented by "100" while being similar. In this embodiment, the shapes of the distal portions 220 and 240 are slightly different from those in Figures 1 to 6. 【0139】 Figure 7 shows a top view of the appliance 200, and Figure 8 shows a side view thereof. Figures 9 and 10 show views from the same side as in Figures 7 to 8, but when the appliance 200 is in the extended configuration, that is, when the biasing member 205 is under pressure due to the tensile force applied to the distal ends of the distal portions 220 and 240 as indicated by line L1. Figure 11 is a perspective view of the appliance 200 in the extended configuration. 【0140】 As in the apparatus 100 of the first embodiment, in this second embodiment, the proximal portions 210, 230 of the first anchor 201 and the second anchor 202 are flat, engage with each other, and can slide longitudinally relative to each other. As a result, a portion of the device 200 in the central region of the device 200, for example, the region of the biasing member 205, can bend, flex, or deform when the device is in an active or extended configuration, as best shown in FIGS. 9-11. In use, this allows movement of the proximal ends 210, 230 of the first anchor 201 and the second anchor 202 inwardly and / or toward the patient's dental arch when in an active or extended configuration. Such a provision allows the device to be configured to move inwardly, for example, away from the patient's cheek, thereby reducing the potential for interference between the patient's cheek and the device 200 in its active configuration, for example, when the patient opens their mouth. Further, by allowing such deformation, the device 200 can deform in the general direction of the tensile force between the second or distal portions or between the first and second anchors, reducing the risk of damage or breakage of the device 200. The distal portions 220, 240 can also bend, flex, or deform, allowing the device 200 to deform in the general direction of the tensile force between the second or distal portions or between the first and second anchors, reducing the risk of damage or breakage of the device 200. 【0141】 To permit such movement during extension of the device, at least the proximal portions 210, 230 of the first anchor 201 and the second anchor 202, and optionally their distal portions 220, 240, are made of a flexible material, typically a shape memory material, such as a shape memory metal like nitinol. 【0142】 FIGS. 12 and 13 show an orthodontic device 300 according to a third embodiment. The orthodontic device 300 of FIGS. 12 and 13 is generally similar to the device 100 of the first embodiment, with similar parts being indicated by numbers incremented by "200". 【0143】 As in the apparatus 100 of the first embodiment (as best shown in FIG. 13), in the apparatus 300 of the third embodiment, the proximal portion 310 of the first anchor 301 extends in a first plane, the distal portion 320 of the first anchor 301 extends in a second plane, and the first plane and the second plane are the same. The proximal portion 330 of the second anchor 302 extends in a third plane, and the distal portion 340 of the second anchor 302 extends in a fourth plane. Each of the proximal portion 330 and the distal portion 340 of the second anchor 302 is substantially flat. 【0144】 However, in the present embodiment, the third plane and the fourth plane are substantially parallel, that is, the proximal portion 330 and the distal portion 340 of the second anchor extend in a substantially common plane. 【0145】 As a result, the first plane and the third plane are not parallel and not the same in the relaxed or contracted form finally, so that the proximal portions 310, 330 of the first anchor 301 and the second anchor 302 engage with each other. In the present embodiment, the first plane and the third plane are substantially perpendicular to each other. 【0146】 In the present embodiment, as shown in FIGS. 12 and 13, the proximal portion 310 of the first anchor 301 and the first or proximal portion 330 of the second anchor 302 are configured to engage with each other by a complementary or interlocking configuration, where the complementary or interlocking configuration consists of a groove or slot in the proximal portion 330 of the second anchor 302 configured to receive the proximal portion 310 of the first anchor. Such a configuration can increase the rigidity of the device 300 in the region of the proximal portions 310, 330 of the first anchor 301 and the second anchor 302 when in the active or extended form. 【0147】 Figures 14 to 16 show an orthodontic appliance 400 according to the fourth embodiment. The orthodontic appliance 400 of Figures 14 to 16 is generally similar to the appliance 200 of the second embodiment, and similar parts are indicated by numbers incremented by "200" while being similar. In the first, second, and third embodiments, the first anchor is machined from a metal sheet with a thickness of 0.4 mm, and the second anchor 102 is machined from a metal sheet with a thickness of 0.9 mm. On the other hand, in the appliance 400 of the fourth embodiment, the first anchor 401 and the second anchor 402 are not made from their respective flat metal sheets but are instead formed. 【0148】 By forming the first anchor 401 and the second anchor 402, the respective proximal portions 410, 430 can be made into more complex shapes. For example, in the present embodiment, the side surfaces of the proximal portions 410, 430 facing each other are flat, and during use, the proximal portions 410, 430 can be easily slid. However, the outsides of the proximal portions 410, 430 (facing away from each other) are curved, and each of the first proximal portion 410 and the second proximal portion 430 defines a hemispherical shape. As a result, the outsides of the proximal portions 410, 430 can more closely conform to the generally tubular internal space defined by the spring 405, enabling a more complementary fit between the spring 405 and the proximal portions 410, 430. Therefore, in the present embodiment, the combined width or diameter of the proximal portions 410, 430 can be substantially equal to the inner diameter of the spring 405 or can be slightly smaller than the inner diameter of the spring 405. 【0149】 It will be understood that the present embodiment is provided as just an example and that various modifications are possible to the present embodiment without departing from the scope of the invention.

Claims

[Claim 1] An orthodontic appliance comprising a biasing device, wherein the biasing device is configured to bias the appliance in a contracted state, and the biasing device is A first anchor configured to connect at its distal end to a first mounting member or to a first location in the patient's mouth, the first anchor having a first or proximal portion including a proximal end and a second or distal portion including a distal end, A second anchor configured to connect at its distal end to a second mounting member or to a second location in the patient's mouth, comprising a first anchor having a first or proximal portion including a proximal end and a second or distal portion including a distal end, A biasing member is provided between the proximal end of the first anchor and the proximal end of the second anchor such that the first or proximal portion of the first anchor and the first or proximal portion of the second anchor overlap. Equipped with, The first or proximal portion of the first anchor extends in a first longitudinal direction at least when the biasing device is in a relaxed or contracted state, and the first or proximal portion of the second anchor extends in a third longitudinal direction at least when the biasing device is in a relaxed or contracted state. The second or distal portion of the first anchor is substantially planar and extends in a second direction in the second plane that is different from the first longitudinal direction of each of its first or proximal portions, and the second or distal portion of the second anchor is substantially planar and extends in a fourth direction in the fourth plane that is different from the third longitudinal direction of each of its first or proximal portions, The second plane is different from the fourth plane in the apparatus. [Claim 2] The apparatus according to claim 1, wherein the second plane and the fourth plane are not parallel to each other. [Claim 3] The apparatus according to claim 1 or 2, wherein the second plane and the fourth plane are at least about 10 to 90 degrees relative to each other when the device is in a relaxed or contracted state. [Claim 4] The apparatus according to claim 3, wherein the second plane and the fourth plane are at least about 45 to 90 degrees relative to each other when the device is in a relaxed or contracted state. [Claim 5] The apparatus according to claim 3, wherein the second plane and the fourth plane are at least about 90° relative to each other when the device is in a relaxed or contracted state. [Claim 6] The apparatus according to claim 1, wherein the first or proximal portion of the first anchor is substantially planar and extends in the first plane. [Claim 7] The apparatus according to claim 6, wherein at least one side surface of the first or proximal portion of the first anchor facing the second anchor is substantially planar and / or flat. [Claim 8] The apparatus according to claim 6, wherein the first plane and the second plane are parallel when at least in a relaxed or contracted state. [Claim 9] The apparatus according to claim 1, wherein the first or proximal portion of the second anchor extends in a third plane. [Claim 10] The apparatus according to claim 9, wherein at least one side surface of the first or proximal portion of the second anchor facing the first anchor is substantially planar and / or flat. [Claim 11] The apparatus according to claim 9, wherein the first plane and the third plane are parallel when at least in a relaxed or contracted state. [Claim 12] The apparatus according to claim 11, wherein the first or proximal portion of the first anchor and the first or proximal portion of the second anchor are configured to contact each other along a flat surface and / or to slide parallel to each other in the longitudinal direction. [Claim 13] The apparatus according to claim 6, wherein the first plane and the second plane are not parallel when they are at least in a relaxed or contracted state. [Claim 14] The apparatus according to claim 13, wherein the first or proximal portion of the first anchor and the first or proximal portion of the second anchor are configured to engage with each other by a complementary or interlocking mechanism. [Claim 15] The apparatus according to claim 1 or 2, wherein at least the first or proximal portion of the first anchor and the second anchor is made of a shape memory material. [Claim 16] The apparatus according to claim 1 or 2, wherein the first anchor and the second or distal portion of the second anchor are made of a shape memory material. [Claim 17] An orthodontic appliance comprising a biasing device, wherein the biasing device is configured to bias the appliance in a contracted state, and the biasing device is A biasing member and At the distal end, a first anchor is configured to connect to a first mounting member or to a first position inside the patient's mouth, At the distal end, a second anchor is configured to connect to a second mounting member or to a second location in the patient's mouth. Equipped with, The first anchor and the second anchor each have a first or proximal portion and a second or distal portion. The first or proximal portion of the first anchor extends in a first longitudinal direction at least when the biasing device is in a relaxed or contracted state, and the first or proximal portion of the second anchor extends in a third longitudinal direction at least when the biasing device is in a relaxed or contracted state. The second or distal portion of the first anchor extends in a second plane in a second direction different from the first longitudinal direction of its respective first or proximal portion, and the second or distal portion of the second anchor extends in a fourth plane in a fourth direction different from the third longitudinal direction of its respective first or proximal portion. An apparatus in which the first or proximal portion of the first anchor and the first or proximal portion of the second anchor are made of a flexible material. [Claim 18] The apparatus according to claim 17, wherein the second or distal portion of the first anchor and the second or distal portion of the second anchor are made of a flexible material. [Claim 19] The apparatus according to claim 17 or claim 18, wherein the flexible material is a shape memory material. [Claim 20] The apparatus according to claim 1 or 2, wherein the biasing member is made of a shape memory material.

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