Rotary instrument for dental implantology or endodontology comprising flexible portion
By introducing flexible devices such as universal joints and bending springs into dental rotary instruments, the contradiction between rigidity and flexibility is solved, stress during use is reduced, and the stability and safety of the instrument is ensured.
Patent Information
- Application Number
- CN202380037304.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-05-13
- Filing Date
- 2023-03-07
- Publication Date
- 2024-12-13
AI Technical Summary
There is a contradiction between the need for rigidity and flexibility, which is suitable for drilling and other operations, but flexibility helps avoid excessive guidance and bone damage, especially the implant retainer has undeniable advantages in flexibility.
Design a rotating device including a flexible device, which can be permanent or variable, located at the proximal or distal part, with components such as universal joints, bending springs and wires to ensure that the device is appropriate during use flexibility and strength.
Through flexible devices, stress on bone and implant during use of the instrument is reduced, excessive guidance and potential bone damage or implant breakage are avoided, while maintaining sufficient torsional rigidity and torque transfer capability.
Smart Images
Figure CN119136761A_ABST
Abstract
Description
[0001] Corresponding application
[0002] This application claims priority to an earlier PCT international application No. PCT / IB2022 / 054490 filed on May 13, 2022 in the name of Frédéric WEHRLI, and the entire contents of that earlier PCT application are incorporated into this application by reference. Technical Field
[0003] The present invention relates to dental implantology and endodontics and, more precisely, to instruments for such purposes. Background Art
[0004] Rotary instruments for dental implantology and endodontics are surgical instruments which, when used in a well-defined sequence, allow the dentist to perform dental treatments using motorized devices. In implantology, these instruments are used to prepare dental implants and place them in the patient's jawbone. In endodontics, corresponding rotary instruments allow the removal of pulp from nerve-damaged teeth (root-root therapy). Rotary instruments for implantology and endodontics consist in particular of two functionally distinct parts, such as Figure 1 For example, that is:
[0005] a proximal portion (also called “standard portion”), for example in the form of a rod provided with standardized ends, for example of the ISO 1797-1 type, allowing the instrument to be connected by contra-angle to a motor so as to be driven in rotation;
[0006] - A distal portion (also called "specific portion"), the design of which (eg its shape and / or size) derives from the main function of the instrument in question (drilling, boring, tapping, threading, filing, etc.).
[0007] exist Figure 1 , examples of rotary instruments for implantology or endodontics with functionally different parts (standard or proximal part 10 at the top, special or distal part 20 at the bottom) are illustrated from left to right: drill, reamer, tap, implant holder, screwdriver for prosthetic screws, extension and endodontic file. Of course, these are examples of instruments, and the use of the present invention is not limited to these examples. It can be understood from the following description that the present invention is also applicable to other equivalent instruments.
[0008] These instruments are completely rigid in their design, or at least completely rigid in their proximal part, which is ideal for drilling or reaming drills, but may become a major disadvantage for tapping, screwdrivers for prosthetic screws, endodontic files and especially for implant holders (instruments for clamping implants and inserting them into bones). In fact, for the latter, a certain flexibility of bending may be an undeniable advantage in practice. This flexibility will make it possible to avoid overguiding in particular, which is usually a considerable stress source in the instrument itself and in the bone and / or implant. In some cases, these stresses may even lead to bone damage (necrosis) or even fracture of the implant.
[0009] Therefore, in practice, while maintaining standardization of such instruments, there are conflicting requirements regarding said instruments: on the one hand, rigidity for certain operations, and on the other hand, the need for a more flexible instrument for other operations. Summary of the invention
[0010] The object of the present invention is to improve the known apparatus and to overcome the above-mentioned problems.
[0011] Another object of the invention is to propose a standardized instrument which can nevertheless be adapted to the wishes of the user, in particular the dentist or surgeon concerned.
[0012] The present invention relates to a rotary instrument for dental implantology or endodontics, comprising:
[0013] - a proximal portion configured to be connected to a drive device, such as a rotary motor, via a contra-angle (or other equivalent means);
[0014] - A distal portion, the shape of which is specific to the use of the instrument.
[0015] The invention is particularly characterized in that the instrument comprises means allowing flexibility of said instrument.
[0016] In some embodiments, the flexible device is permanently flexible. In other embodiments, the flexible device can have at least two states: one is rigid and the other is flexible. Other states are also possible, such as semi-rigid (or semi-flexible).
[0017] In some embodiments, the flexible device is located on the proximal portion of the instrument.
[0018] In some embodiments, a flexible device is located (eg, added) between the proximal portion and the distal portion of the instrument.
[0019] In other embodiments, the flexible means is located (eg, added) between the proximal portion and the means for connecting the instrument to a drive means (such as a motor).
[0020] In some embodiments, the flexible device comprises a joint.
[0021] In some embodiments, the proximal portion is formed of or includes a flexible member that has sufficient torsional rigidity for the intended use of the device, such as Nitinol (an alloy of nickel and titanium) or other equivalent materials (e.g., metals, metal alloys, etc.).
[0022] In some embodiments, the joint comprises a universal joint formed by at least two prongs and a generally spherical central yoke.
[0023] In some embodiments, the universal joint includes a pin and a pair of pin halves, and the central yoke is traversed by two perpendicular passages sized to receive the pin and the pair of pin halves.
[0024] In some embodiments, the center yoke includes two perpendicular grooves, and the fork includes a guide dimensioned to slide in the grooves.
[0025] In some embodiments, the flexible device comprises a coil spring and / or a wire spring.
[0026] In some embodiments, the instrument (eg, a proximal portion thereof) includes a plurality of flexible devices.
[0027] In some embodiments, the instrument can be a drill, a reamer, a tap, an implant holder, a screwdriver, a file, an adapter, or an extension that can be connected to one or more other instruments.
[0028] Further embodiments and features of the invention are described in the claims and the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In the remainder of the description, the invention is explained in more detail, in particular by means of several examples and embodiments, all of which must be considered as illustrative and non-restrictive.
[0030] Figure 1 Examples of rotary instruments for implantology or endodontics are illustrated.
[0031] Figure 2 An embodiment of the invention is illustrated in an assembled state.
[0032] Figure 3 The decomposition form is shown Figure 2 implementation method.
[0033] Figures 4 to 7 Another embodiment of the present invention is illustrated.
[0034] Figure 8Another embodiment of the present invention is illustrated.
[0035] Fig. 9 and Fig.10 The use of embodiments of the present invention for an implant holder is illustrated (as a non-limiting example). DETAILED DESCRIPTION
[0036] Figure 2 In this embodiment, the proximal portion 10 of the instrument 1 comprises a flexible device having a joint 11 comprising a universal joint 12 coupled to a bending spring 13 .
[0037] like Figure 3 As shown, Figure 2 The universal joint 12 comprises a central yoke 14 to which two forks 15, 15' are connected by means of a pin 16 and two half-pins 16', 16". The pins 16, 16', 16" are inserted into channels 14', 14" in the yoke 14 so as to form the joint. Of course, fastening means are provided so that the pins, once inserted, remain in place.
[0038] The axis of the pin 16 and the axes of the two half-pins 16', 16" are preferably perpendicular in order to avoid any oscillations during rotation of the instrument. This is desirable since oscillations could induce stresses in the instrument 1, the bone or the implant, which would be exactly the opposite of what the invention seeks.
[0039] The universal joint 11 may be located on the proximal portion 10, or between the proximal portion 10 and the distal portion 20, which allows the joint to be completely free in flexion while having good torsional stiffness, a property necessary for good torque transmission in the instrument.
[0040] The bending spring 13 itself imparts semi-rigidity in bending to the entire joint, thereby ensuring a certain strength of the instrument 1. The spring 13 also allows the instrument 1 to be reversibly folded.
[0041] Figures 4 to 7 Another embodiment of the invention using a fork and a slotted ball is illustrated.
[0042] exist Figure 4 In FIG. 1 , a fork 30 is illustrated, which is fixed to the proximal portion 10 of the instrument. Figure 5 A slotted ball 31 is illustrated, on which the fork 30 will engage (e.g., by applying a force), such as Figure 6 By way of example, a guide 35 engages on the ball by means of which it engages in the groove 33 .
[0043] Figure 7The attachment of the second prong 32 to the ball 31 (for example by applying a force, by means of a guide 36 sliding in a groove 34) is illustrated, the second prong facing the fork 30 and placed at 90° so as to form a contact with the ball 31. Figure 2 and Figure 3 A joint similar to a universal joint.
[0044] In this embodiment, in a variation, a spring 13 may be added to Figure 2 The same is true in the implementation method of .
[0045] To this end, a shoulder is preferably added to hold the spring in place around the joint.
[0046] Figure 8 Another embodiment of the invention is illustrated. In this embodiment, a metal wire 40, for example made of NiTi or steel (or another equivalent material), is inserted through the forks 30, 32 and the ball 31 in order to ensure bending rigidity.
[0047] Figures 4 to 8 The flexible means may be located on the proximal portion 10 of the instrument, or between the proximal portion 10 and the distal portion 20 of the instrument, or between the proximal portion 10 and a device connected to a motor 50 (as a means for driving the instrument), see Fig. 9 .
[0048] For example, Fig.10 exemplifies an embodiment in which the proximal portion 10 is formed of or comprises a flexible member that is sufficiently rigid in torsion for the intended use of the instrument, wherein the proximal portion 10 is partially or completely formed of the flexible member.
[0049] In the case of the implant holder 51, by means of the flexible means exemplified in the above embodiment, even when the available space is as Fig. 9 The functionality of the instrument (insertion of the implant into the bone) is ensured even when the insertion is restricted.
[0050] In this case, the instrument holder (contra-angle 50) is held by the surgeon at an angle (e.g. up to 30°). Fig. 9 and Fig.10 By way of example, by means of a flexible joint, the implant holder 51 connected to the contra-angle can perform its function even when the interocclusal height is small.
[0051] It goes without saying that the invention is not limited to the examples and uses described above, and that the invention and its advantages can be used in various applications.
[0052] Embodiments have been described to provide a comprehensive understanding of the structural principles, functions, manufacture and use of the systems and methods described in this application. One or more of these embodiments are illustrated in the accompanying drawings. The systems and methods specifically described in this application and illustrated in the accompanying drawings are non-limiting embodiments, and the scope of the invention is not limited only by the claims. The features illustrated or described with respect to one embodiment may be combined with the features of other embodiments. These modifications and variations are intended to be included within the scope of the present invention. Many problems with conventional methods and systems are pointed out herein, and the methods and systems described herein can solve one or more of these problems. Moreover, although the present invention has been described in conjunction with a certain number of embodiments, the present application also encompasses substitutions, modifications, equivalents and variations within the spirit and scope of the present invention.
Claims
1. A rotary instrument (1) for dental implantology or endodontics, comprising at least: - a proximal portion (10) configured to be connected to a rotary drive; - a distal portion (20) whose shape is determined by the purpose of the device, Characterized in that the device comprises flexible means allowing flexibility of the device (1).
2. The device according to claim 1, characterized in that The flexible device has two states: a flexible state and a rigid state.
3. The device according to any one of the preceding claims, characterized in that The flexible means is located on the proximal portion (10) of the instrument (1).
4. The device according to any one of claims 1 and 2, characterized in that The flexible means is located between the proximal portion (10) and the distal portion (20) of the instrument (1).
5. The device according to any one of claims 1 and 2, characterized in that The flexible means are located between the proximal portion (10) and the means for connecting to the drive means (50).
6. Apparatus according to any one of the preceding claims, characterized in that The flexible device includes a joint.
7. Device according to the preceding claim, characterized in that The joint comprises a universal joint formed by at least two forks (15, 15'; 30, 32) and a substantially spherical central yoke (14; 31).
8. Device according to the preceding claim, characterized in that The universal joint comprises a pin (16) and a pair of half pins (16', 16"), and the central yoke (14) is traversed by two perpendicular passages (14', 14") sized to receive the pin and the pair of half pins (16, 16', 16").
9. The device according to any one of claims 1 to 7, characterized in that The central yoke (31) comprises two vertical grooves (33, 34), and the forks (30, 32) comprise guides (35, 36) dimensioned to slide in the grooves.
10. Apparatus according to any one of the preceding claims, characterized in that The flexible means comprises a helical spring (13).
11. The device according to any one of claims 1 to 9, characterized in that The flexible means comprises a wire spring (40).
12. The device according to any one of claims 1 to 11, characterized in that The proximal portion (10) comprises a plurality of flexible means.
13. Apparatus according to any one of the preceding claims, characterized in that The instrument is a drill, a reamer, a tap, an implant holder, a screwdriver, a file, an adapter or an extension that can be connected to one or more other instruments.