An induction coil device for detecting dental implant stability

Abstract

This invention discloses an induction coil device for detecting the stability of dental implants. The induction coil device has a dumbbell-shaped body and mainly includes: a shell, an outer ring secondary coil, an inner ring primary coil, and an iron core. The outer ring secondary coil is the excitation output; the inner ring primary coil is the feedback input. This device is used in conjunction with a sensing device installed on the dental implant. Utilizing the resonant frequency analysis method (RFA), it outputs alternating magnetic pulses with fixed power and a set frequency range through electromagnetic conversion. The leakage magnetic field and the external magnetic field stimulate the sensor installed on the implant to generate resonance, and the resonance frequency is ultimately fed back to the induction coil device. This resonance frequency can directly reflect the stability of the dental implant. This invention has high practical value in the early and late stages of dental implant repositioning.

Description

Technical Field

[0001] This invention belongs to the field of dental medical equipment technology, and specifically relates to an induction coil device for detecting the stability of dental implants. Background Technology

[0002] Since the application of titanium dental implants in the treatment of missing teeth in the 1960s, dental implantology has been widely accepted. Looking back at the development of dental implantology in dentistry, it has evolved from initially focusing on material biocompatibility and success rates to now prioritizing aesthetics and timeliness in implant restorations. In recent years, the evaluation of dental implant treatment has also gradually shifted towards shortening treatment time, aiming for a simpler, more convenient, and faster implantation process. Since the establishment of modern implant systems, the stability of dental implants has been a crucial factor in implant success, ensuring successful osseointegration. Clinicians often rely on experience or literature reports when assessing the stability of dental implants for superstructure restoration. Whether based on occlusal forces or X-rays, this involves subjective judgment and cannot be continuously tracked and measured. Because the superstructure can only be fabricated after bone healing and good osseointegration are confirmed, this subjectively judged safety timeframe may force patients to wait longer or result in premature superstructure restoration, leading to incomplete or damaged osseointegration. Therefore, before proceeding with the second stage of repair, it is essential to have a suitable method to measure the stability of the implant at this stage in order to determine whether osseointegration of the implant is complete.

[0003] Currently, the commonly used clinical methods for testing the stability of dental implants are the torque test and the periodic test. The former is only used during implant placement and cannot measure later stability. It is invasive when used in the second stage. The latter is a mechanical percussion method, which is easily affected by the testing angle and position, and therefore reflects certain deviations in actual biomechanical parameters, with lower sensitivity. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an induction coil device for detecting the stability of dental implants.

[0005] To achieve the above objectives, this invention introduces a resonance frequency analysis method to measure the changes in resonance frequency caused by changes in bone boundaries during the healing process of dental implants, serving as a reference for judging the fit between dental implants and surrounding bone.

[0006] This invention provides the following technical solution: an induction coil device for detecting the stability of dental implants. The induction coil body is dumbbell-shaped and includes: a shell, an outer ring secondary coil, an inner ring primary coil, and an iron core; the inner ring primary coil is wrapped around the iron core and located in the middle section inside the dumbbell-shaped shell, and is also wrapped around the outer wall of the iron core; the outer ring secondary coil is wrapped around the middle section of the dumbbell-shaped shell; the outer ring secondary coil is the excitation output; and the inner ring primary coil is the feedback input.

[0007] The main body of the induction coil device serves as a transducer probe module and is installed in the head of the handheld detection device using an interference fit. Two symmetrical fan-shaped ear plates are also fixedly installed on the side wall of the outer shell. A slot is opened on the center line of the ear plates, and the slot is interference fitted into two symmetrical fixing plates inside the head of the handheld detection device. The fixing plates are integrally formed with the inner wall of the handheld detection device.

[0008] As a preferred embodiment of the present invention, the induction coil device for detecting the stability of dental implants is characterized in that the length of the induction coil device is about 8 mm to 10 mm, the diameter of the head and tail is about 5.5 to 6.5 mm, and the diameter of the middle is about 4 mm to 5 mm.

[0009] As a preferred embodiment of the present invention, the outer ring secondary coil has approximately 250 to 300 turns, and the inner ring primary coil has approximately 85 to 100 turns.

[0010] As a preferred embodiment of the present invention, the outer ring secondary coil has a diameter of approximately 0.05~0.7 mm and a total length of approximately 15 mm~17 mm, and the inner ring primary coil has a diameter of approximately 0.15 mm~0.2 mm and a total length of approximately 6 mm~8 mm.

[0011] As a preferred embodiment of the present invention, the iron core has a diameter of about 3.0 mm to 4.0 mm, an inner ring diameter of about 4 mm to 5 mm, and an outer ring diameter of 5.0 mm to 6 mm.

[0012] As a preferred embodiment of the present invention, the alternating magnetic field generated by the outer ring secondary coil excites the sensing device mounted on the dental implant to resonate, and the resonance frequency varies with the bone healing stiffness, ranging from 3500 Hz to 8500 Hz.

[0013] The beneficial effects of this invention are as follows: 1. It adopts an original dumbbell-shaped structure design, reducing the coil volume and production costs. 2. The dumbbell-shaped structure can reduce the cross-coupling between the inner and outer loop coils. 3. The dumbbell-shaped structure facilitates fixed installation in a dental implant stability testing instrument. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. The accompanying drawings are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of an induction coil device used for detecting the stability of dental implants.

[0016] Figure 2 This is a perspective view of an induction coil device used for detecting the stability of dental implants.

[0017] Figure 3 This is a schematic diagram of the outer ring secondary coil and the inner ring primary coil.

[0018] Figure 4 This is an induction coil device installed in a dental implant stability testing device.

[0019] Figure 5 This diagram illustrates the process of testing the stability of a dental implant.

[0020] 1-Outer shell, 11-Ear plate, slot 111, 2-Outer ring secondary coil, 3-Inner ring primary coil, 4-Iron core, 5-Fixing plate, 10-Body of induction coil, 20-Handheld detection device, 30-Sensing device. Detailed Implementation

[0021] To make the advantages of the invention more readily understood, the invention briefly described above will be described in more detail with reference to the specific embodiments shown in the accompanying drawings.

[0022] Reference Appendix Figure 1 The present invention provides a preferred embodiment of an induction coil device for detecting the stability of dental implants.

[0023] Reference Appendix Figure 2 , 3 4 and 5, the inventive device is dumbbell-shaped. The induction coil device includes: a housing, an outer ring secondary coil, an inner ring primary coil, and an iron core. The outer ring secondary coil is the excitation output; the inner ring primary coil is the feedback input.

[0024] To explain the principle of the device of the present invention for detecting the stability of dental implants, the following description is provided:

[0025] The resonant frequency of a rod-shaped structure of fixed length changes depending on the stability of its boundaries. For example, when the tension of a violin string is adjusted, the frequency of the sound produced by the string changes; the tighter the string is bound, the higher its resonant frequency. Similarly, the better the stability of an implant, the higher its resonant frequency. In this invention, the outer ring secondary coil of the device outputs an alternating magnetic field with fixed power and a set frequency range through electromagnetic conversion. The inner ring primary coil interacts with the external magnetic field of the sensing device 30 installed on the dental implant through leakage magnetic field, generating an induced electromotive force through electromagnetic induction and feeding it back to the main control chip.

[0026] Because the external magnetic field of the sensing device 30 dampens the alternating magnetic field actively generated by the secondary coil of the outer ring, it induces a small change (Δu) in the electromotive force of the primary coil of the inner ring. The main control chip quantizes this Δu and corresponds it to a stability value for display.

[0027] The present invention includes a handheld detection device 20 and a sensing device 30. The body 10 of the induction coil device is disposed at the head of the handheld detection device 20. The body 10 of the induction coil device is dumbbell-shaped. The body 10 of the induction coil device mainly includes: a shell 1, an outer ring secondary coil 2, an inner ring primary coil 3 and an iron core 4.

[0028] The inner ring primary coil 3 is wrapped around the iron core 4 and located in the middle section inside the dumbbell-shaped outer shell 1. The inner ring primary coil 3 is wrapped around the outer wall of the iron core 4. The outer ring secondary coil 2 is wrapped around the middle section of the dumbbell-shaped outer shell 1.

[0029] The outer ring secondary coil 2 is the excitation output, and the inner ring primary coil 3 is the feedback input.

[0030] In designing the coil structure, to reduce the cross-coupling between the inner and outer loop coils and improve the accuracy of dental implant stability detection, the traditional symmetrical coil structure was technically innovated by designing the coil as a dumbbell shape, which can reduce the impact of cross-coupling on detection to a certain extent.

[0031] The main body 10 of the induction coil device serves as a transducer probe module and is installed on the head of the handheld detection device 20 using an interference fit. Two symmetrical fan-shaped ear plates 11 are also fixedly installed on the side wall of the outer shell 1. A slot 111 is opened on the center line of the ear plate 11. The slot 111 is interference fitted onto two symmetrical fixing plates 5 inside the head of the handheld detection device 20. The fixing plates 5 are integrally formed with the inner wall of the handheld detection device 20.

[0032] The body 10 of the induction coil device has a length of approximately 8 mm to 10 mm, a head and tail diameter of approximately 5.5 to 6.5 mm, and a middle diameter of approximately 4 mm to 5 mm.

[0033] The outer ring secondary coil 2 has approximately 250 to 300 turns, and the inner ring primary coil 3 has approximately 85 to 100 turns.

[0034] The outer ring secondary coil 2 has a diameter of approximately 0.05~0.7 mm and a total length of approximately 15mm~17 mm, while the inner ring primary coil 3 has a diameter of approximately 0.15 mm~0.2 mm and a total length of approximately 6mm~8 mm.

[0035] The iron core 4 has a diameter of approximately 3.0 mm to 4.0 mm, an inner ring diameter of approximately 4 mm to 5 mm, and an outer ring diameter of 5.0 mm to 6 mm.

[0036] The alternating magnetic field generated by the outer ring secondary coil 2 excites the sensing device 30 installed on the dental implant to resonate. The resonance frequency varies with the bone healing stiffness, ranging from 3500 Hz to 8500 Hz.

[0037] To determine the relationship between bone boundary stiffness and the resonant frequency of the device, and to adjust the coil parameters, the following in vitro experiment was conducted: The sensing device 30 of the dental implant was implanted into the central cavity (diameter: 5.0 mm, depth: 17 mm) of the resin block, with white plaster filling the space between the device and the resin block. As the white plaster gradually hardened, the resonant frequency values ​​of the device were measured at 10, 15, 20, 25, 30, 35, 40, and 45 minutes. This experiment was repeated multiple times to adjust the design parameters of the device to achieve optimal measurement results.

[0038] To verify the practicality of the present invention, the following embodiments are provided:

[0039] Preferably, the medical personnel install the sensing device 30 of the dental implant onto the dental implant using specialized medical tools. During use, the medical personnel move one end of the body 10 of the handheld detector 20, which has an induction coil, inside the patient's oral cavity to a position less than a first distance from the sensing device 30 of the implant. Preferably, to ensure testing accuracy, the first distance is less than 2 mm.

[0040] Generally, implant stability is consistent across different orientations. However, sometimes variations in the bone boundary around the implant can affect its stability in different locations. Preferably, to more accurately measure implant stability, medical personnel need to take average values ​​from different angles and positions. Preferably, the technical solution of this invention improves the work efficiency of medical personnel. Therefore, this invention can improve the ease of operation, efficiency, and accuracy of implant stability testing.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. An induction coil device for detecting the stability of dental implants, comprising a handheld detection device (20) and a sensing device (30), characterized in that, The main body (10) of the induction coil device is located at the head of the handheld detection device (20); the main body (10) of the induction coil device is dumbbell-shaped; the main body (10) of the induction coil device mainly includes: a shell (1), an outer ring secondary coil (2), an inner ring primary coil (3) and an iron core (4); the inner ring primary coil (3) is wrapped around the iron core (4) and is located in the middle section inside the dumbbell-shaped shell (1), and the inner ring primary coil (3) is wrapped around the outer wall of the iron core (4); the outer ring secondary coil (2) is wrapped around the middle section of the dumbbell-shaped shell (1); the outer ring secondary coil (2) is the excitation output and the inner ring primary coil (3) is the feedback input; The body (10) of the induction coil device has a length of 8 mm to 10 mm, a head and tail diameter of 5.5 mm to 6.5 mm, and a middle diameter of 4 mm to 5 mm; The alternating magnetic field generated by the outer ring secondary coil (2) excites the sensing device (30) installed on the dental implant to resonate. The resonance frequency varies with the bone healing stiffness, ranging from 3500 Hz to 8500 Hz.

2. The induction coil device for detecting dental implant stability as described in claim 1, characterized in that, The main body (10) of the induction coil device serves as a transducer probe module and is installed on the head of the handheld detection device (20) using an interference fit slot. Two symmetrical fan-shaped ear plates (11) are also fixedly installed on the side wall of the outer shell (1). A slot (111) is opened on the center line of the ear plate (11). The slot (111) is interference fitted on two symmetrical fixing plates (5) inside the head of the handheld detection device (20). The fixing plate (5) is integrally formed with the inner wall of the handheld detection device (20).

3. The induction coil device for detecting dental implant stability as described in claim 1, characterized in that, The outer ring secondary coil (2) has 250 to 300 turns, and the inner ring primary coil (3) has 85 to 100 turns.

4. The induction coil device for detecting dental implant stability as described in claim 1, characterized in that, The outer ring secondary coil (2) has a diameter of 0.05 mm to 0.7 mm and a total length of 15 mm to 17 mm, and the inner ring primary coil (3) has a diameter of 0.15 mm to 0.2 mm and a total length of 6 mm to 8 mm.

5. The induction coil device for detecting dental implant stability as described in claim 1, characterized in that, The iron core (4) has a diameter of 3.0 mm to 4.0 mm, an inner ring diameter of 4 mm to 5 mm, and an outer ring diameter of 5 mm to 6 mm.

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