Universal extraction device for implant fracture abutment

Abstract

This application provides a universal removal device for fractured implant abutments, relating to the field of dental implants. It includes: a mounting base; a clamping assembly disposed on the mounting base for clamping the fractured abutment; and a push-back screw threaded to the mounting base, one end of which passes through the mounting base and can pass through the middle of the fractured abutment to abut against the implant, and the other end is fixedly provided with a hexagonal nut. By rotating the push-back screw, the clamping assembly pulls the fractured abutment out of the implant under the push-back force of the screw. This application facilitates the removal of fractured abutments from implants and reduces the risk of damage to the patient's gingiva during the removal process.

Description

Technical Field

[0001] This application relates to the field of dental implant technology, and in particular to a universal device for removing a fractured implant abutment. Background Technology

[0002] In clinical practice of dental implant restoration, implant abutments frequently fracture due to prolonged masticatory forces, fatigue stress, or material defects. The fractured abutment fragments often remain inside the implant and must be safely removed before restoration or replacement can be performed. Currently, the common clinical approach is to use clamping instruments (such as hemostatic forceps or specialized removal forceps) to grasp the fractured surface and remove the fragments by rotation or pull. Alternatively, ultrasonic vibration or micro-drills can be used to assist in loosening, but the core removal procedure still relies on the mechanical manipulation of the clamping instruments.

[0003] However, existing technologies have significant limitations: First, clamp-type instruments struggle to apply precise axial force within the oral cavity, and the direction of force application is prone to deviation, potentially causing damage to the implant's internal threads or even implant displacement. Second, non-axial forces can easily lead to further fragmentation of the abutment's broken ends, increasing the difficulty of removal. More importantly, the clamp beaks are prone to slipping during operation, causing compression or tearing of the patient's gingival soft tissue, posing a risk of trauma. Therefore, there is an urgent need for a specialized tool that can achieve axial force application, protect soft tissue, and provide stable operation to address these issues. Utility Model Content

[0004] To address the aforementioned technical issues, this application provides a universal device for removing fractured implant abutments.

[0005] The universal device for removing fractured implant abutments provided in this application adopts the following technical solution: A universal device for removing a fractured implant abutment, comprising: Mounting base; A clamping assembly, disposed on the mounting base, is used to clamp the fractured base. The reverse screw is threaded to the mounting base. One end of the screw passes through the mounting base and can pass through the middle of the fractured abutment to abut against the implant. The other end is fixedly equipped with a hexagonal nut. When the reverse screw is rotated, the clamping assembly pulls the fractured abutment out of the implant under the reverse thrust of the reverse screw.

[0006] Furthermore, the clamping assembly includes grippers and a clamping drive. Two grippers are provided, both of which are slidably connected to the mounting base. The reverse screw is disposed between the two grippers. The clamping drive is disposed on the mounting base and is used to drive the two grippers to slide closer to or further away from each other.

[0007] Furthermore, the gripper is L-shaped, with a through hole at one end near the mounting base that matches the size of the mounting base. The gripper slides onto the mounting base through the through hole.

[0008] Furthermore, an elastic pad is provided on the side of the gripper away from the mounting base and close to the reverse screw, and the end of the elastic pad away from the gripper has an arc-shaped structure.

[0009] Furthermore, the clamping drive includes: The rotating seat is fixedly connected to the side wall of the mounting base; A rotating bearing is installed inside the rotating seat; A bidirectional screw has threads with opposite directions at both ends, which are arranged along the sliding direction of the gripper and are rotatably connected to the rotating seat through a rotating bearing. A rotating handle, located at one end of the bidirectional screw, is used to drive the bidirectional screw to rotate. The jaws are fixed with ear plates on the side near the bidirectional screw, and the ear plates on the two jaws are threaded to both ends of the bidirectional screw.

[0010] Furthermore, the end of the thrust screw away from the mounting base is detachably provided with an end head, the shape and diameter of which can be selected according to usage requirements.

[0011] Furthermore, the end includes a cylindrical section and a stud section. The diameter of the cylindrical section is not greater than the diameter of the reverse screw. The stud section is coaxially and fixedly connected to the cylindrical section. The cylindrical section is threadedly connected to the reverse screw through the stud section. A flat groove is formed on the side wall of the cylindrical section away from the stud section.

[0012] Furthermore, the end portion includes a tap section and a stud section. The tap section is an inverted conical tap, and the maximum diameter of the tap section is greater than the inner diameter of the fractured base. The stud section is coaxially and fixedly connected to the tap section, and the tap section is threadedly connected to the push screw through the stud section.

[0013] Furthermore, a cylindrical transition section is provided between the tap section and the stud section, and the transition section has planar cuts on opposite sides of its sidewall.

[0014] Furthermore, a handle is fixed to one end of the mounting base, and during use, the handle extends from inside the patient's mouth to the outside of the mouth.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. When it is necessary to remove the fractured abutment, remove the central screw, clamp and fix the fractured abutment with the clamping assembly, and then use a torque wrench to turn the hexagonal nut at the end of the push screw. The push screw forms a push force by pressing against the inner wall of the implant, thereby pushing the fractured abutment out of the implant axially, improving the stability of the removal force and reducing the risk of trauma to the patient's gums during the removal process; 2. The clamping assembly uses two L-shaped jaws, which work in conjunction with the bidirectional threads at both ends of the bidirectional screw, to achieve synchronous movement of the two jaws. The conical inclined surface at the bottom of the abutment is used to clamp the fractured abutment. The anti-loosening effect of the threads can keep the jaws stable and make it easy to remove the fractured abutment from the implant with the help of the counter-thrust force. 3. When the fracture of the abutment is deep and the exposed length of its tapered bevel is insufficient for the clamping assembly, the end of the push screw can be replaced with an inverted tapered tap. Then, the push screw can be rotated to move the inverted tapered tap toward the fractured abutment and embed it into the fractured abutment. This creates a stable threaded mechanical fit between the tap and the inner wall of the fractured abutment. By slightly shaking the push screw to loosen the fractured abutment, a small axial force can be applied to pull the fractured abutment out of the implant. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the assembly of the implant and abutment, where (a) is a complete abutment, (b) is an abutment with a shallow fracture, and (c) is an abutment with a deep fracture.

[0018] Figure 2 yes Figure 1 Front sectional view of part (a).

[0019] Figure 3 This is a usage illustration of Embodiment 1 of this application.

[0020] Figure 4 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0021] Figure 5 This is a schematic diagram of the structure from another perspective of Embodiment 1 of this application.

[0022] Figure 6 This is an exploded view of the reverse thrust screw and end of Embodiment 1 of this application.

[0023] Figure 7This is an exploded view of the reverse thrust screw and end of Embodiment 2 of this application.

[0024] Figure 8 This is a schematic diagram of the usage state of Embodiment 2 of this application.

[0025] Reference numerals: 1. Implant; 2. Abutment; 3. Central screw; 4. Mounting base; 5. Clamping assembly; 51. Gripper; 511. Perforation; 512. Elastic pad; 513. Ear plate; 52. Rotating seat; 53. Rotating bearing; 54. Double-acting screw; 55. Rotating handle; 6. Reverse screw; 61. Hex nut; 62. End; 621. Stud section; 622. Cylindrical section; 623. Flat groove; 624. Tap section; 625. Transition section; 626. Flat cut; 7. Handle; 71. Elastic sleeve. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] like Figure 1 and Figure 2 As shown, the abutment 2 is locked in the inner hole of the implant 1 by the central screw 3. When the abutment breaks (e.g. Figure 1 (b) or (c) requires the central screw 3 to be removed first. The bottom of the fractured abutment 2 is in close contact with the implant 1. In particular, when the connection of the abutment 2 is set to a Morse taper, it is more difficult to pull it out. Therefore, the device of this application is designed to stably remove the fractured abutment 2.

[0028] Example 1 Reference Figure 3-6 A universal device for removing fractured implant abutments includes a mounting base 4, a clamping assembly 5, and a reverse screw 6. The mounting base 4, a rectangular strip, serves as the overall support structure, with an operating handle 7 fixedly connected to one end. During operation, the handle 7 extends from inside the patient's mouth to the outside, allowing for stable gripping by the operator. An elastic sleeve 71 is fitted onto the outer surface of the handle 7 for easier gripping and improved ease of operation.

[0029] The clamping assembly 5 is mounted on the mounting base 4 and includes two L-shaped grippers 51 arranged opposite each other. The end of the gripper 51 closest to the mounting base 4 is slidably connected to the mounting base 4 through a through hole 511. The through hole 511 has the same cross-sectional shape and size as the mounting base 4, allowing it to move stably back and forth along the mounting base direction. The end of the gripper 51 furthest from the mounting base is provided with an elastic pad 512, and the outer surface of the elastic pad 512 is arc-shaped to adapt to the bottom slope of the fractured abutment 2, ensuring stable clamping and avoiding damage to the inner wall of the implant 1.

[0030] To drive the synchronous clamping and releasing of the grippers 51, the clamping assembly 5 also includes a rotating seat 52, a rotating bearing 53, a bidirectional screw 54, and a rotating handle 55. The bidirectional screw 54 has threads with opposite directions at both ends, which are threadedly connected to the lugs 513 on the two grippers 51. The rotating handle 55 extends from the bidirectional screw 54 to near the elastic sleeve 71 of the handle 7. It is cylindrical and has anti-slip textures on its surface to facilitate the operation of rotating the bidirectional screw 54. When the rotating handle 55 drives the bidirectional screw 54 to rotate, the two grippers 51 can simultaneously move closer or further apart, achieving reliable clamping or releasing of the fractured base 2.

[0031] The mounting base 4 has a threaded hole in the middle. The push screw 6 is connected to the mounting base 4 via the thread. One end of the push screw 6 passes through the mounting base 4 and can extend into the central through hole of the implant 1, while the other end is fixed with a hexagonal nut 61. When the operator turns the hexagonal nut 61 with a torque wrench, the torque wrench can prevent excessive torque from damaging the patient's gums. The push screw 6 is gradually pushed towards the abutment 2, forming contact with the inner wall of the implant 1, thereby generating a stable push force. Under the action of this push force, the fractured abutment 2 fixed by the clamping assembly 5 can be pulled out axially, realizing the removal operation.

[0032] To adapt to different clinical environments, the end of the push-back screw 6 furthest from the mounting base 4 is detachably equipped with an end head 62. The end head 62 includes a cylindrical section 622 and a stud section 621. The diameter of the cylindrical section 622 is no larger than the diameter of the push-back screw 6, and it is coaxially threaded to the push-back screw 6 via the stud section 621. A flat groove 623 is formed on the outer wall of the cylindrical section 622 to facilitate installation and removal using tools such as wrenches.

[0033] During use, if the fracture of the fractured abutment 2 is shallow and its bottom bevel is sufficient to expose it, the operator first removes the central screw 3, then uses the bidirectional screw 54 to drive the two jaws 51 to clamp the bottom of the fractured abutment 2, and then rotates the hexagonal nut 61 to push the push screw 6 into the implant 1 and generate a counter-pushing force, finally pulling out the fractured abutment 2 smoothly. Throughout the entire operation, the force direction is always kept axial to avoid damage to the internal threads of the implant 1 and the surrounding gingival tissue caused by skewed force.

[0034] Example 2 Reference Figure 7 and Figure 8 The difference between this embodiment and Embodiment 1 lies in the structure of the end cap 62 at the end of the thrust screw 6. In Embodiment 2, the end cap 62 includes a tap section 624, a transition section 625, and a stud section 621. The tap section 624 is an inverted conical tap. The stud section 621 is coaxially welded and fixed to the tap section 624. The maximum diameter of the tap section 624 is larger than the inner diameter of the fractured base 2, allowing it to gradually cut into the interior of the fractured base 2 during rotational propulsion and form a reliable threaded engagement. The tap section 624 is coaxially threaded to the thrust screw 6 via the stud section 621.

[0035] To facilitate the installation of the tap section 624, a cylindrical transition section 625 is provided between the tap section 624 and the stud section 621. Two pairs of planar cuts 626 are provided on the outer side wall of the transition section 625 to facilitate the fastening and disassembly of the end 62.

[0036] During use, when the fracture of the fractured base 2 is deep and its tapered slope is not fully exposed, making it difficult for the clamping assembly 5 to directly clamp it, the operator can replace the end 62 with an inverted tapered tap structure and remove the jaws 51 from the mounting base. Then, rotate the reverse screw 6 to gradually screw the tap section 624 into the internal cavity of the fractured base 2, forming a mechanical engagement with the inner wall of the base 2. Once the tap section 624 is tightly engaged with the base 2, repeatedly and slightly shaking the reverse screw 6 can gradually loosen the fractured base 2. At this point, the operator can apply a small axial force while holding the handle 7 to easily pull out the deeply fractured base 2.

[0037] This improved structure effectively solves the problem of excessively deep fractures and difficulty in utilizing the clamping component 5, further enhancing the applicability of the device and the reliability of clinical operations.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A universal device for removing a fractured implant abutment, characterized in that, include: Mounting base; A clamping assembly, disposed on the mounting base, is used to clamp the fractured base. The reverse screw is threaded to the mounting base. One end of the screw passes through the mounting base and can pass through the middle of the fractured abutment to abut against the implant. The other end is fixedly equipped with a hexagonal nut. When the reverse screw is rotated, the clamping assembly pulls the fractured abutment out of the implant under the reverse thrust of the reverse screw.

2. The universal removal device for a fractured implant abutment according to claim 1, characterized in that, The clamping assembly includes two jaws and a clamping drive. The jaws are provided and are slidably connected to the mounting base. The push screw is located between the two jaws. The clamping drive is located on the mounting base and is used to drive the two jaws to slide closer to or further away from each other.

3. The universal removal device for a fractured implant abutment according to claim 2, characterized in that, The gripper is L-shaped, and one end of it near the mounting base has a through hole that matches the size of the mounting base. The gripper slides onto the mounting base through the through hole.

4. A universal device for removing a fractured implant abutment according to claim 3, characterized in that, An elastic pad is provided on the side of the gripper away from the mounting base and close to the reverse screw, and the end of the elastic pad away from the gripper has an arc-shaped structure.

5. A universal removal device for a fractured implant abutment according to any one of claims 2-4, characterized in that, The clamping drive includes: The rotating seat is fixedly connected to the side wall of the mounting base; A rotating bearing is installed inside the rotating seat; A bidirectional screw has threads with opposite directions at both ends, which are arranged along the sliding direction of the gripper and are rotatably connected to the rotating seat through a rotating bearing. A rotating handle, located at one end of the bidirectional screw, is used to drive the bidirectional screw to rotate. The jaws are fixed with ear plates on the side near the bidirectional screw, and the ear plates on the two jaws are threaded to both ends of the bidirectional screw.

6. A universal device for removing a fractured implant abutment according to claim 1, characterized in that, The end of the thrust screw away from the mounting base is detachably provided with an end head, the shape and diameter of which can be selected according to the usage requirements.

7. A universal device for removing a fractured implant abutment according to claim 6, characterized in that, The end includes a cylindrical section and a stud section. The diameter of the cylindrical section is not greater than the diameter of the reverse screw. The stud section is coaxially and fixedly connected to the cylindrical section. The cylindrical section is threadedly connected to the reverse screw through the stud section. A flat groove is formed on the side wall of the cylindrical section away from the stud section.

8. A universal removal device for a fractured implant abutment according to claim 6, characterized in that, The end portion includes a tap section and a stud section. The tap section is an inverted tapered tap, and the maximum diameter of the tap section is greater than the inner diameter of the fractured base. The stud section is coaxially and fixedly connected to the tap section, and the tap section is threadedly connected to the push screw through the stud section.

9. A universal device for removing a fractured implant abutment according to claim 8, characterized in that, A cylindrical transition section is provided between the tap section and the stud section, and the transition section has planar cuts on opposite sides of its sidewall.

10. A universal device for removing a fractured implant abutment according to claim 1, characterized in that, One end of the mounting base is fixed with a handle, which extends from inside the patient's mouth to the outside of the mouth during use.

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