Device for measuring stability of implant in alveolar bone and preparation method thereof

Abstract

The invention discloses a device for measuring the stability of an implant in an alveolar bone and a preparation method of the device. The device comprises a connecting part, a supporting part and a magnetic part, the connecting part is used for fixing the device with an implant; one end of the supporting part is connected with the connecting part, and the other end of the supporting part is connected with the magnetic part; the magnetic part comprises a cylindrical magnetic part and a shell; the shell comprises a bottom surface and a side wall; the lower end part of the side wall is connected with the periphery of the bottom surface, and the side wall and the bottom surface form a cavity; the magnetic component is arranged in a cavity formed by the bottom surface and the side wall; a groove is formed in the upper end of the side wall and arranged in the length direction of the side wall. The magnetic component in the device is not easy to fall off, and the magnetic field distribution is relatively uniform.

Description

Technical Field

[0001] The invention relates to a device for measuring the stability of an implant in an alveolar bone and a preparation method thereof. Background Art

[0002] With the development of society and the continuous improvement of living standards, people have also put forward higher requirements for the chewing ability of teeth. Patients with tooth defects or dental diseases usually implant implants on the alveolar bone, and then cooperate with abutments and dentures to achieve the effect of repairing the chewing function of teeth. However, the implants will become loose over time, and how to reasonably evaluate the looseness of the implants has become a problem. X-rays of the alveolar bone in the mouth can judge the stability of the implants in the alveolar bone, but the accuracy of the results is poor. Because X-rays can only be used for frontal imaging, if the implant moves back and forth or tilts and sways, it is difficult to accurately judge the looseness of the implant based on the X-rays.

[0003] CN114948314A discloses a sensor device for detecting the stability of an implant in an alveolar bone, which consists of an implant, a resonance body and a threaded connection section. The top of the implant is connected to the resonance body, and the bottom of the implant is connected to the threaded connection section. The implant is in the shape of a Morse cone, and the top of the resonance body wraps a spherical permanent magnet material. The resonance frequency of the resonance body varies with the stiffness of bone healing, ranging from 3500Hz to 8500Hz. There are defects in the magnetic field distribution around the device, which affects the accuracy of judging the stability of the implant.

[0004] CN220404163U discloses a three-in-one temporary implant base, including an upper connecting part for connecting a dental crown and a lower connecting part for connecting an implant. A rough area is provided on the outer surface of the upper connecting part, and the rough area is used for bonding the crown. A magnetic part is provided at the upper end of the upper connecting part, and the magnetic part is used to cooperate with an ISQ measuring instrument to measure the stability of the implant. At least two asymmetrically arranged scanning identification surfaces are provided on the outer surface of the upper connecting part. The magnetic part is in an annular shape. The magnetic part on the temporary base is easy to fall off, posing a safety hazard. In addition, the magnetic field distribution uniformity of the annular magnetic part is poor, which affects the accuracy of the measurement.

[0005] CN220385207U discloses a three-in-one implant carrier, including a rod body, a clamping groove is arranged on the upper end side of the rod body, a connecting part is arranged at the lower end, the connecting part is detachably connected to the implant, a magnetic part is arranged at the upper end of the rod body, the magnetic part is used to cooperate with the ISQ measuring instrument to measure the stable phase of the implant, and at least two asymmetrically arranged scanning and identification parts are arranged on the side of the upper end of the rod body, and the scanning and identification parts are used to cooperate with the intraoral scanner to scan and take molds. A card slot is arranged on the upper end surface of the rod body, and the magnetic part is fixedly installed in the card slot. The card slot is annular or circular, and the shape of the magnetic part is the same as that of the card slot. The device covers the magnetic part in the card slot, which will weaken the magnetic field strength of the magnetic part and reduce the sensitivity and accuracy of the measurement. Summary of the invention

[0006] In view of this, one object of the present invention is to provide a device for measuring the stability of an implant in the alveolar bone, in which the magnetic components are not easy to fall off, reducing the hidden dangers to patients during use, and the magnetic field distribution is relatively uniform, which improves the accuracy of measurement. Furthermore, the exposed area of ​​the magnetic components of the device is large, which improves the sensitivity and measurement accuracy. Furthermore, the magnetic field distribution of the device is relatively moderate, which can not only meet the measurement needs, but also reduce the damage of radiation to the user. Another object of the present invention is to provide a preparation method for a device for measuring the stability of an implant in the alveolar bone, which has high precision and high raw material utilization.

[0007] The above purpose is achieved through the following technical solutions.

[0008] The present invention provides a device for measuring the stability of an implant in an alveolar bone, comprising a connecting portion, a supporting portion and a magnetic portion;

[0009] The connecting portion is configured to fix the device to the implant;

[0010] One end of the support portion is connected to the connecting portion, and the other end of the support portion is connected to the magnetic portion;

[0011] The magnetic part includes a cylindrical magnetic component and a shell;

[0012] The housing comprises a bottom surface and a side wall; the lower end of the side wall is connected to the outer periphery of the bottom surface, and the side wall and the bottom surface form a cavity;

[0013] The magnetic component is arranged in a cavity formed by the bottom surface and the side wall;

[0014] A groove is formed at the upper end of the side wall, and the groove is arranged along the length direction of the side wall.

[0015] According to the device of the present invention, preferably, the number of the grooves is at least 6, and the plurality of grooves are evenly arranged around the axial direction of the housing.

[0016] According to the device of the present invention, preferably, the shells of the connecting part, the supporting part and the magnetic part are formed of a titanium alloy, and the titanium alloy includes 85 to 93 parts by weight of titanium, 3 to 9 parts by weight of aluminum and 1 to 6 parts by weight of vanadium;

[0017] The magnetic component is a neodymium iron boron magnet, which includes 25 to 37 parts by weight of neodymium, 60 to 75 parts by weight of iron and 0.7 to 1.8 parts by weight of boron.

[0018] According to the device of the present invention, preferably, the height of the magnetic component is 2.5-8 mm, and the diameter is 0.8-3.5 mm; the shape of the cavity matches the shape of the magnetic component.

[0019] According to the device of the present invention, preferably, r1-r0 is 0.2-0.8 mm, H1-H0 is 0.1-0.5 mm;

[0020] Among them, r1 represents the outer diameter of the shell, r0 represents the diameter of the magnetic component, H1 represents the height of the shell, and H0 represents the height of the magnetic component.

[0021] According to the device of the present invention, preferably, the groove has a length of 0.5-3 mm and a depth of 0.1-1 mm.

[0022] According to the device of the present invention, preferably, the supporting part includes a supporting rod and a connecting cone, one end of the supporting rod is connected to the bottom surface of the outer shell, the other end of the supporting rod is connected to a bottom surface of the connecting cone, and the other bottom surface of the connecting cone is connected to the connecting part.

[0023] According to the device of the present invention, preferably, the support rod is a cylinder; the diameter of the connecting portion is smaller than the diameter of the support rod; the bottom surface of the connecting cone with a smaller surface area is connected to the connecting portion, and the bottom surface of the connecting cone with a larger surface area is connected to the support rod.

[0024] According to the device of the present invention, preferably, the connecting portion is provided with threads, and the connecting portion is fixed to the implant by means of threaded connection.

[0025] In another aspect, the present invention provides a method for preparing the above device, comprising the following steps:

[0026] (1) Mixing raw materials containing titanium powder, aluminum powder, vanadium powder and a plasticizer to obtain alloy powder; wherein the average particle size of the titanium powder is 80 to 120 μm, the average particle size of the aluminum powder is 80 to 120 μm, and the average particle size of the vanadium powder is 80 to 120 μm;

[0027] (2) placing the alloy powder into a mold and pressing it at a pressure of 450 to 750 MPa to obtain a pressed body;

[0028] (3) sintering the pressed green body under the protection of an inert gas to obtain a sintered body;

[0029] (4) post-processing the sintered body to obtain an integrally formed shell of a connecting portion, a supporting portion, and a magnetic portion;

[0030] (5) The magnetic component is installed in the housing to obtain a device for measuring the stability of an implant in an alveolar bone.

[0031] The magnetic component of the present invention can be stably embedded in the cavity of the housing and has a large exposed area, which not only reduces the potential safety hazard to the user caused by the accidental fall of the magnetic component, but also improves the sensitivity of the measurement, generates induction within an appropriate range, and reduces radiation to the user. The device of the present invention can resonate with a scanning square wave of 1Hz to 2MHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The invention relates to a device for measuring the stability of an implant in an alveolar bone.

[0033] Figure 2 Schematic diagram of different positions of the magnetic field.

[0034] The reference numerals are as follows:

[0035] 11-connecting body; 12-connecting head; 21-support rod; 22-connecting truncated cone; 311-side wall; 313-groove; 32-magnetic component;

[0036] 1-directly above; 2-upper side position; 3-middle position; 4-lower side position. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0038] <Device for measuring the stability of implants in alveolar bone>

[0039] The device for measuring the stability of an implant in an alveolar bone of the present invention comprises a connecting part, a supporting part and a magnetic part. Each part is described in detail below.

[0040] Connection

[0041] The connection part of the present invention is configured to fix the device of the present invention to the implant. The shape of the connection part can match the shape of the groove body provided in the implant. The connection part can be provided with a thread. The groove body of the implant can be provided with a thread matched therewith, so that the device of the present invention can be fixed to the implant by means of a threaded connection.

[0042] In certain embodiments, the connector includes a connector body and a connector head.

[0043] One end of the connecting part body is connected to the connecting head. The other end of the connecting part body is connected to the supporting part. The connecting part body can be a cylinder. The thread is arranged on the connecting part body. The thread can be arranged close to the connecting head.

[0044] The outer surface of the connector may be a convex curved surface. The connector may be in a semi-spherical shape.

[0045] The connecting part may be formed of a titanium alloy. The titanium alloy may include titanium, aluminum and vanadium. Preferably, the titanium alloy consists of titanium, aluminum and vanadium.

[0046] The content of titanium may be 85 to 93 parts by weight, preferably 87 to 92 parts by weight, and more preferably 89 to 90 parts by weight.

[0047] The content of aluminum may be 3 to 9 parts by weight, preferably 4 to 8 parts by weight, and more preferably 6 to 7 parts by weight.

[0048] The content of vanadium may be 1 to 6 parts by weight, preferably 2 to 5 parts by weight, and more preferably 3 to 4 parts by weight.

[0049] Support

[0050] One end of the supporting part of the present invention is connected to the connecting part, and the other end of the supporting part is connected to the magnetic part.

[0051] In certain embodiments, the support portion includes a support rod and a connecting frustum.

[0052] One end of the support rod is connected to the connecting truncated cone, and the other end of the support rod is connected to the magnetic part. Specifically, the other end of the support rod is connected to the bottom surface of the shell. The support rod can be a cylinder. The diameter of the support rod can be greater than the diameter of the connecting part body.

[0053] The connecting truncated cone has a small end face and a large end face. The small end face refers to the bottom face of the connecting truncated cone with a smaller surface area. The large end face refers to the bottom face of the connecting truncated cone with a larger surface area. The large end face of the connecting truncated cone is connected to one end of the support rod. The small end face of the connecting truncated cone is connected to the connecting part. Specifically, the small end face is connected to the connecting part body.

[0054] The support part may be formed of a titanium alloy. The titanium alloy may include titanium, aluminum and vanadium. Preferably, the titanium alloy consists of titanium, aluminum and vanadium.

[0055] The content of titanium may be 85 to 93 parts by weight, preferably 87 to 92 parts by weight, and more preferably 89 to 90 parts by weight.

[0056] The content of aluminum may be 3 to 9 parts by weight, preferably 4 to 8 parts by weight, and more preferably 6 to 7 parts by weight.

[0057] The content of vanadium may be 1 to 6 parts by weight, preferably 2 to 5 parts by weight, and more preferably 3 to 4 parts by weight.

[0058] Magnetics

[0059] The magnetic part of the present invention comprises a housing and a cylindrical magnetic component.

[0060] The housing includes a side wall and a bottom surface. The lower end of the side wall is connected to the outer periphery of the bottom surface. The side wall and the bottom surface form a cavity. The projection of the bottom surface on the horizontal plane can be circular. The diameter of the bottom surface is greater than the diameter of the support rod.

[0061] At least 4 grooves are provided at the upper end of the side wall; preferably, at least 6 grooves are provided. In some embodiments, 6 grooves are provided. The grooves are arranged along the length direction of the side wall. The length direction of the side wall refers to the direction from the upper end of the side wall to the bottom surface. Multiple grooves are evenly arranged around the axial direction of the shell. The length of the groove can be 0.5 to 3 mm; preferably 1 to 2 mm; more preferably 1.5 to 1.8 mm. The depth of the groove can be 0.1 to 1 mm; preferably 0.3 to 0.8 mm; more preferably 0.5 to 0.6 mm. The groove does not penetrate the side wall. In this way, the magnetic component can be firmly embedded in the cavity of the shell, and the magnetic component can have a larger exposure area to emit a uniformly distributed magnetic field.

[0062] The shape of the cavity matches the shape of the magnetic component. The diameter of the cavity can be 0.8 to 3.5 mm, preferably 1.5 to 3 mm, and more preferably 2.05 to 2.3 mm. The height of the cavity can be 2.5 to 8 mm, preferably 3 to 7 mm, and more preferably 5 to 6 mm.

[0063] The height of the shell can be 3 to 9 mm, preferably 4 to 8 mm, and more preferably 5.35 to 6.5 mm. The outer diameter of the shell can be 1 to 4 mm, preferably 2 to 3.5 mm, and more preferably 2.56 to 2.8 mm.

[0064] r1-r0 is 0.2-0.8 mm, preferably 0.3-0.6 mm, and more preferably 0.5-0.55 mm. r1 represents the outer diameter of the housing. r0 represents the diameter of the magnetic component.

[0065] H1-H0 is 0.1-0.5 mm, preferably 0.2-0.4 mm, and more preferably 0.3-0.35 mm. H1 represents the height of the housing, and H0 represents the height of the magnetic component.

[0066] The housing may be formed of a titanium alloy. The titanium alloy may include titanium, aluminum and vanadium. Preferably, the titanium alloy consists of titanium, aluminum and vanadium.

[0067] The content of titanium may be 85 to 93 parts by weight, preferably 87 to 92 parts by weight, and more preferably 89 to 90 parts by weight.

[0068] The content of aluminum may be 3 to 9 parts by weight, preferably 4 to 8 parts by weight, and more preferably 6 to 7 parts by weight.

[0069] The content of vanadium may be 1 to 6 parts by weight, preferably 2 to 5 parts by weight, and more preferably 3 to 4 parts by weight.

[0070] The magnetic component of the present invention is a cylinder, which can be stably and firmly embedded in the cavity of the shell to reduce the risk of falling off, and can maximize the uniformity of the magnetic field.

[0071] The magnetic component is arranged in a cavity formed by the bottom surface and the side wall of the housing. The diameter of the magnetic component can be 0.8 to 3.5 mm, preferably 1.5 to 3 mm, and more preferably 2.05 to 2.3 mm. The height of the magnetic component can be 2.5 to 8 mm, preferably 3 to 7 mm, and more preferably 5 to 6 mm. An adhesive layer can be arranged between the magnetic component and the bottom surface of the cavity. The magnetic component can be fixedly bonded in the cavity by glue.

[0072] The magnetic component may be a neodymium iron boron magnet. The neodymium iron boron magnet includes neodymium, iron and boron elements. The content of neodymium may be 25 to 37 parts by weight; preferably 30 to 35 parts by weight; more preferably 31 to 33 parts by weight. According to one embodiment of the present invention, the content of neodymium is 31.7 parts by weight. The content of iron may be 60 to 75 parts by weight; preferably 62 to 70 parts by weight; more preferably 65 to 68 parts by weight. According to one embodiment of the present invention, the content of iron is 67.1 parts by weight. The content of boron may be 0.7 to 1.8 parts by weight; preferably 0.9 to 1.5 parts by weight; more preferably 1.2 to 1.3 parts by weight. This can ensure a higher magnetic field strength, a more uniform magnetic field distribution and an appropriate magnetic field space.

[0073] The magnetic component of the present invention can be stably and firmly embedded in the cavity of the housing, and has a high exposure area, which reduces the risk of the magnetic component falling off to the user and improves the accuracy of measurement. The magnetic component of the present invention is a cylinder, which can generate a uniformly distributed magnetic field and improve the accuracy of measurement. The magnetic part of the present invention has a small volume, and the magnetic field space generated is small, about 3 to 5 mm around the magnetic component, which not only meets the detection needs, but also reduces the damage of magnet radiation to the human body.

[0074] <Preparation method>

[0075] The preparation method of the present invention comprises the following steps: (1) a step of mixing raw materials; (2) a step of pressing; (3) a step of sintering; (4) a step of post-processing; and (5) a step of assembling magnetic components. Each step is introduced below.

[0076] Steps for mixing raw materials

[0077] The present invention mixes raw materials containing titanium powder, aluminum powder, vanadium powder and plasticizer to obtain alloy powder. Preferably, the raw materials are composed of titanium powder, aluminum powder, vanadium powder and plasticizer.

[0078] The amount of titanium powder used can be 85 to 93 parts by weight, preferably 87 to 92 parts by weight, and more preferably 89 to 90 parts by weight. The average particle size of the titanium powder is 80 to 120 μm, preferably 90 to 110 μm, and more preferably 100 to 105 μm.

[0079] The amount of aluminum powder used can be 3 to 9 parts by weight, preferably 4 to 8 parts by weight, and more preferably 6 to 7 parts by weight. The average particle size of the aluminum powder is 80 to 120 μm, preferably 90 to 110 μm, and more preferably 100 to 105 μm.

[0080] The amount of vanadium powder used can be 1 to 6 parts by weight, preferably 2 to 5 parts by weight, and more preferably 3 to 4 parts by weight. The average particle size of the vanadium powder is 80 to 120 μm, preferably 90 to 110 μm, and more preferably 100 to 105 μm.

[0081] The plasticizer is preferably paraffin wax. The amount of the plasticizer used can be 0.5-1% of the total mass of the titanium powder, aluminum powder and vanadium powder.

[0082] Steps of Suppression

[0083] The present invention puts alloy powder into a mold and compresses it at a pressure of 450-750 MPa to obtain a pressed body. The shells of the connecting part, the supporting part and the magnetic part of the present invention are made in an integrated manner, and the mold is determined by the shapes of the shells of the connecting part, the supporting part and the magnetic part.

[0084] Preferably, the pressing pressure is 500-700 MPa; more preferably, the pressing pressure is 550-600 MPa.

[0085] Sintering steps

[0086] The present invention sintered the pressed green body under the protection of inert gas to obtain a sintered body.

[0087] The inert gas can be selected from one or more of nitrogen, helium, neon and argon. Preferably, the inert gas is nitrogen.

[0088] The sintering temperature may be 1120 to 1250° C. The sintering time may be 0.5 to 2 hours.

[0089] Under the pressing and sintering conditions of the present invention, a titanium alloy with appropriate porosity can be obtained.

[0090] Post-processing steps

[0091] The present invention performs post-processing on the sintered body to obtain an outer shell of an integrally formed connection part, a supporting part and a magnetic part.

[0092] The post-treatment process may be selected from one or more of coining, rolling, extrusion, quenching, surface quenching, oil immersion and infiltration. According to one embodiment of the present invention, the sintered body is sequentially coined, quenched, surface quenched and oil immersion.

[0093] The coining may be performed at a pressure of 600 to 1000 MPa; preferably, at a pressure of 700 to 900 MPa.

[0094] The quenching temperature may be 850-1100° C., preferably 900-1000° C. The quenching medium may be water.

[0095] The surface quenching temperature may be 850 to 1100° C., preferably 900 to 1000° C. Water may be used for quenching.

[0096] No. 20 engine oil can be used for oil immersion. The oil immersion can be carried out at a temperature of 80 to 120° C. The oil immersion time can be 0.5 to 2 hours, preferably 1 to 1.5 hours.

[0097] Steps for assembling magnetic components

[0098] The invention installs the magnetic component into the shell to obtain a device for measuring the stability of the implant in the alveolar bone.

[0099] Example 1

[0100] like Figure 1As shown, the device for measuring the stability of an implant in an alveolar bone of this embodiment includes a connecting portion, a supporting portion and a magnetic portion.

[0101] The connection part is used to fix the device to the implant. The shape of the connection part matches the shape of the groove body provided in the implant. The connection part includes a connection part body 11 and a connection head 12. The connection head 12 is connected to one end of the connection part body 11. A thread is provided on the connection part body 11. The thread is provided close to the connection head 12. The thread matches the thread provided in the groove body in the implant, thereby fixing the connection part to the implant. The connection part body 11 is a cylinder. The outer surface of the connection head 12 is an outwardly convex arc surface. The connection head 12 is in a hemispherical shape.

[0102] The support portion includes a support rod 21 and a connecting cone 22. The support rod 21 is a cylinder. The diameter of the support rod 21 is larger than the diameter of the connecting portion body 11. The small end face of the connecting cone 22 is connected to an end of the connecting portion body 11 away from the connecting head 12. The large end face of the connecting cone 22 is connected to one end of the support rod 21. The small end face refers to the bottom face of the connecting cone 22 with a smaller surface area. The large end face refers to the bottom face of the connecting cone 22 with a larger surface area.

[0103] The magnetic part includes a housing and a cylindrical magnetic component 32 .

[0104] The shell includes a bottom surface (not shown) and a side wall 311. The lower end of the side wall 311 is connected to the periphery of the bottom surface. The side wall 311 and the bottom surface form a cavity. Six grooves 313 are provided at the upper end of the side wall 311. The grooves 313 are arranged along the length direction of the side wall 311. A plurality of grooves 313 are evenly arranged around the axial direction of the shell. The length direction of the side wall 311 refers to the direction from the upper end of the side wall 311 to the bottom surface. The height of the shell is 5.35 mm, and the outer diameter of the shell is 2.56 mm. The length of the groove 313 is 1.50 mm and the depth is 0.50 mm. The projection of the bottom surface on the horizontal plane is circular. The diameter of the bottom surface is larger than the diameter of the support rod 21.

[0105] The magnetic component 32 is arranged in a cavity formed by the bottom surface and the side wall 311 of the housing. The height of the magnetic component 32 is 5.00 mm and the diameter is 2.05 mm. The shape of the cavity matches the shape of the magnetic component 32. In this way, part of the magnetic component 32 can be exposed outside the housing, thereby improving the sensitivity of the test. The magnetic component 32 can be a neodymium iron boron magnet. The chemical composition of the magnetic component 32 of this embodiment is 31.7wt% neodymium, 67.1wt% iron and 1.2wt% boron.

[0106] The chemical composition of the outer shells of the connection part, the support part and the magnetic part of this embodiment is 90wt% titanium, 6wt% aluminum and 4wt% vanadium.

[0107] The device of this embodiment is prepared by the following method:

[0108] (1) Titanium powder, aluminum powder and vanadium powder are uniformly mixed in a mass ratio of 90:6:4, and paraffin is added thereto to obtain alloy powder. The average particle size of the titanium powder is 100 μm, the average particle size of the aluminum powder is 100 μm, the average particle size of the vanadium powder is 100 μm, and the amount of the paraffin is 0.7% of the total mass of the titanium powder, the aluminum powder and the vanadium powder.

[0109] (2) The alloy powder is placed in a mold and pressed at a pressure of 600 MPa to obtain a pressed body.

[0110] (3) The compacted body was sintered in a high temperature furnace at 1210° C. for 1.5 h with nitrogen as a protective gas to obtain a sintered body.

[0111] (4) The sintered body is sequentially subjected to precision pressing, quenching, surface quenching and oil immersion to obtain a housing having an integrally formed connection portion, a supporting portion and a magnetic portion.

[0112] The coining was performed at a pressure of 800 MPa.

[0113] When the sintered body after precision pressing reaches the quenching temperature of 980°C, it is quickly put into water for quenching to obtain a quenched sintered body. During the quenching process, it is necessary to ensure that the sintered body is completely immersed in water.

[0114] The quenched sintered body is placed in an oxygen-acetylene flame, its surface is heated to a quenching temperature of 980° C., and then quenched by spraying water to obtain a surface quenched sintered body.

[0115] The surface-quenched sintered body was immersed in No. 20 engine oil at 80 to 120°C for 1 hour.

[0116] (5) The magnetic component 32 is installed in the housing, and the bottom of the magnetic component 32 is fixed to the bottom of the housing by glue, thereby obtaining a device for measuring the stability of an implant in an alveolar bone.

[0117] Experimental example

[0118] The Tesla meter is used to measure the magnetic field distribution around the device (such as Figure 2 The magnetic field distribution close to the magnetic part of the device is as follows: the magnetic field size at the top position is 74.12mT, the magnetic field size at the top side position is 21.21mT, the magnetic field size at the middle position is 34.58mT, and the magnetic field size at the bottom side position is 22.23mT. The magnetic field sizes at the top position, top side position, middle position, and bottom side position at a distance of 4mm from the magnetic part of the device are 7.33mT, 3.09mT, 3.42mT, and 3.16mT, respectively. This value is just within the sensing range of the detector and will not produce excessive radiation effects on the human body.

[0119] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement and substitution that can be conceived by those skilled in the art shall fall within the scope of the present invention.

Claims

1. A device for measuring the stability of an implant in an alveolar bone, characterized in that: The device comprises a connecting portion, a supporting portion and a magnetic portion; The connecting portion is configured to fix the device to the implant; One end of the support portion is connected to the connecting portion, and the other end of the support portion is connected to the magnetic portion; The magnetic part includes a cylindrical magnetic component and a shell; The housing comprises a bottom surface and a side wall; the lower end of the side wall is connected to the outer periphery of the bottom surface, and the side wall and the bottom surface form a cavity; The magnetic component is arranged in a cavity formed by the bottom surface and the side wall; A groove is formed at the upper end of the side wall, and the groove is arranged along the length direction of the side wall.

2. The device according to claim 1, characterized in that The number of the grooves is at least 6, and the plurality of grooves are evenly arranged around the axial direction of the shell.

3. The device according to claim 1, characterized in that The outer shells of the connecting part, the supporting part and the magnetic part are formed of a titanium alloy, wherein the titanium alloy includes 85 to 93 parts by weight of titanium, 3 to 9 parts by weight of aluminum and 1 to 6 parts by weight of vanadium; The magnetic component is a neodymium iron boron magnet, which includes 25 to 37 parts by weight of neodymium, 60 to 75 parts by weight of iron and 0.7 to 1.8 parts by weight of boron.

4. The device according to claim 1, characterized in that The height of the magnetic component is 2.5-8 mm, and the diameter is 0.8-3.5 mm; the shape of the cavity matches the shape of the magnetic component.

5. The device according to claim 1, characterized in that r1-r0 is 0.2~0.8mm, H1-H0 is 0.1~0.5mm; Among them, r1 represents the outer diameter of the shell, r0 represents the diameter of the magnetic component, H1 represents the height of the shell, and H0 represents the height of the magnetic component.

6. The device according to claim 1, characterized in that The length of the groove is 0.5-3 mm, and the depth is 0.1-1 mm.

7. The device according to claim 1, characterized in that The support portion includes a support rod and a connecting truncated cone, one end of the support rod is connected to the bottom surface of the shell, the other end of the support rod is connected to a bottom surface of the connecting truncated cone, and the other bottom surface of the connecting truncated cone is connected to the connecting portion.

8. The device according to claim 7, characterized in that The support rod is a cylinder; the diameter of the connecting portion is smaller than the diameter of the support rod; the bottom surface of the connecting cone with a smaller surface area is connected to the connecting portion, and the bottom surface of the connecting cone with a larger surface area is connected to the support rod.

9. The device according to any one of claims 1 to 8, characterized in that: The connection part is provided with a thread, and the connection part is fixed to the implant by means of a threaded connection.

10. The method for preparing the device according to any one of claims 1 to 9, characterized in that: The steps include: (1) Mixing raw materials containing titanium powder, aluminum powder, vanadium powder and a plasticizer to obtain alloy powder; wherein the average particle size of the titanium powder is 80 to 120 μm, the average particle size of the aluminum powder is 80 to 120 μm, and the average particle size of the vanadium powder is 80 to 120 μm; (2) placing the alloy powder into a mold and pressing it at a pressure of 450 to 750 MPa to obtain a pressed body; (3) sintering the pressed green body under the protection of an inert gas to obtain a sintered body; (4) post-processing the sintered body to obtain an integrally formed shell of a connecting portion, a supporting portion, and a magnetic portion; (5) The magnetic component is installed in the housing to obtain a device for measuring the stability of an implant in an alveolar bone.

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