CN115836926A - Oral implant detection and positioning device and positioning method - Google Patents

Abstract

The invention discloses an oral implant detection and positioning device and an oral implant positioning method. The detection and positioning coil comprises 6-10 layers of detection and positioning coils arranged in the PCB; the size of the coil is gradually reduced. The detection and positioning coils are powered by electrodes connected with a power supply and are connected in parallel. Two shapes are designed and can be selected according to actual conditions. The invention has the beneficial effects that: 1. convenient manufacture and low cost. 2. The disposable probe and positioning coil can avoid the infection of bacteria in the oral cavity to the probe and positioning coil, thereby preventing the propagation of bacteria. 3. The current in the coil is only about 20mA, and the generated alternating magnetic field intensity can not damage the biological tissues in the oral cavity. 4. The detection and positioning structure of the involute runway-shaped copper coil based on the PCB substrate and having a multilayer structure ensures portability and improves detection and positioning accuracy.

Description

Dental implant detection and positioning device and positioning method

technical field

The invention belongs to the field of anti-interference and high-sensitivity gum implant detection and positioning, in particular to a dental implant detection and positioning device and a positioning method.

Background technique

When people's teeth fall out, it is usually necessary to fix dental implants on the gums, and then fix the crowns on the implants, so that the newly filled teeth can play the role of chewing food normally. However, the service life of the crown fixed on the implant is usually about five years. After the time is up, the crown will loosen and fall off; with the growth of the muscles on the gum bed, the implant will be covered after a period of time. When the tooth is treated again Sometimes, it often happens that the dental implant buried in the gum bed cannot be found; therefore, it is very important to determine the upper and lower positions and specific positions of the dental implant accurately, conveniently and quickly for timely treatment of the tooth.

The traditional detection and positioning head is connected in series with the upper and lower layers, that is, the current flows out through the central part of the upper coil, and then flows in the central part of the lower coil as the beginning. The defect is that the magnetic fields generated by the instantaneous current in the two coils cancel each other out. It not only causes energy waste, but also increases the detection and positioning time; it cannot form a strong magnetic field, resulting in low detection and positioning accuracy.

Contents of the invention

The purpose of the present invention is to make a dental implant detection and positioning head that is easy to make and has high sensitivity, specifically a device and a manufacturing method that improves the sensitivity and accuracy of detecting and positioning oral implants, thereby ensuring portability while Improved detection and location accuracy.

The present invention is realized through the following technical solutions, including a base composed of 6 to 10 layers of PCB boards, and a plastic shell, and correspondingly set 6 to 10 layers of slots in the shell, and the PCB boards are inserted into the slots;

The detection and positioning coils are set on each layer of PCB board, and the detection and positioning coils on each layer of PCB board are reduced step by step from the top surface to the bottom surface, and the reserved sockets of each level of detection and positioning coil are on the PCB board Formed plug-in terminals;

It also includes a copper ring connected to both ends of the detection and positioning coil; it also includes a power supply circuit that uses the copper ring as a bridge to connect with the copper ring and lead to the plug-in terminal; the power supply circuit is covered with a casing and connected to the power supply; the casing can prevent its interference Detection and positioning; all levels of detection and positioning coils are connected in this way, so that a sufficiently strong magnetic field can be generated under alternating current; the generated magnetic field distribution is concave.

The detection and positioning coils on each layer of PCB board are connected in parallel step by step. The power supply of each detection and positioning level coil does not interfere with each other. It is only regulated by the general power supply. The current flows into the coil through the power supply circuit, and then flows out of the coil.

The detection and positioning coils are involute runway coils;

The horizontal and vertical dimensions of the involute racetrack-shaped coil are reduced by 0.1mm step by step from the top surface to the bottom surface, that is, the horizontal dimension of the coil is gradually: 6.6mm, 6.5mm, 6.4mm, 6.3mm, 6.2mm, 6.1mm , 6.0mm, 5.9mm, 5.8mm, 5.7mm; the longitudinal dimensions are: 5.0mm, 4.9mm, 4.8mm, 4.7mm, 4.6mm, 4.5mm, 4.4mm, 4.3mm, 4.2mm, 4.1mm;

The length of the straight portion of the involute racetrack coil is 2 mm to 3 mm.

The base is made of glass fiber cloth-based FR-4 material, and the thickness of each layer of PCB board is 0.1 mm; and the space between each layer is 0.04 to 0.01 mm.

The copper material of the detection and positioning coil has a thickness of 35um and a width of 0.2mm to 0.25mm. The involute racetrack coil gradually shrinks from the outside to the inside, with a total of 6 turns, and the distance between each turn is 0.1mm to 0.15mm.

The diameter of the copper ring is 500um.

The frequency of the sinusoidal alternating current passing through the detection and positioning coil is 2300kHz to 2600kHz, and the peak voltage in normal operation is 450mV. The size of the shell is greater than the sum of the detection and positioning coils of each layer, and the size of the shell is 1.4mm high, 3cm long, and 2cm wide.

The plug-in end of the PCB board is also set to be L-shaped, the length of the bent section at the end of the L-shaped plug-in end is 33 mm, and the connecting section in the middle of the plug-in end is 10 mm.

The invention includes the following manufacturing method: when assembling, 6 to 10 layers of PCB boards are used, and the PCB boards of each layer are pushed into the corresponding slots in the shell from top to bottom according to the order of coil size from large to small, and the Each layer of PCB board is fixed.

The detection and positioning method of the present invention comprises the following steps:

Step 1. Insert the PCB substrate wound with the detection and positioning coil into the probe of the detection and positioning device, and then extend the probe into the vicinity of the teeth in the oral cavity;

Step 2 Start the power supply of the detection and positioning device, and high-frequency current will pass through the detection and positioning coil, thereby generating a periodically oscillating magnetic field around the detection and positioning coil;

Step 3. When the magnetic field interacts with the metal dental implant buried in the gum, an induced electromotive force will be generated in the metal dental implant, and then an induced current will be generated, and the magnetic field generated by the induced current will hinder the change of the original magnetic field. Therefore, it will cause changes in the current in the detection and positioning coils, and finally the detection device on the detection and positioning device will send an alarm signal according to the change in current; due to the asymmetry of the 6-layer to 10 detection and positioning coils in the PCB substrate, thus The strength of the magnetic field at the top and bottom is also different. When the probe is in the middle of the upper and lower teeth, the probe can also quickly distinguish the metal dental implant, and then move the probe to achieve accurate positioning.

In the step 3, the calculation formula of the magnetic induction of the involute runway-shaped detection and positioning coil is:

Taking the front coil as the xoy plane, the coordinate origin is located at the center of the central hole, so the distribution of the magnetic field above the xoy plane on the central axis is obtained as:

On the central axis, the distribution of the magnetic field below the xoy plane is:

Finally, on the central axis, the total magnetic field distribution is:

。

.

The beneficial effects of the present invention are as follows: 1. The production is convenient and the cost is low. 2. One-time use, avoiding the infection of the detection and positioning coil by bacteria in the oral cavity, thereby preventing the spread of bacteria. 3. The magnitude of the current in the coil is only about 20mA, and the strength of the generated alternating magnetic field will not damage the biological tissues in the oral cavity. 4. The detection and positioning structure of the involute racetrack-shaped copper coil based on the PCB substrate with 6-10 layers of structure ensures portability while improving the detection and positioning accuracy.

Description of drawings

Figure 1 is a schematic diagram of the structure of the detection and positioning head.

Figure 2 is a schematic diagram of the assembly of coils at all levels.

Figure 3 is a disassembled view of the coils at all levels.

Figure 4 is a simulated assembly diagram of any two-stage coil.

Figure 5 is a single-stage coil current flow diagram (in a single cycle).

Figure 6 is a schematic diagram of the housing.

Fig. 7 is a schematic diagram of an L-shaped plug-in terminal.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessarily confusing the concept of the present invention; in addition, as long as the technical features involved in different embodiments of the present invention described below Conflicts can be combined with each other. Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For clarity, various parts in the drawings are not drawn to scale;

The preferred embodiments of the present invention will be further described below in conjunction with accompanying drawings 1 to 7. The present invention is realized through the following technical solutions, including a base 1 composed of 6 to 10 layers of PCB boards 11, and a plastic shell 12, and the shell 12 is correspondingly provided with 6 To the 10-layer slot 121, the PCB board 11 is inserted in the slot 121;

The detection and positioning coils 2 are arranged on each layer of PCB board 11, and the detection and positioning coils 2 on each layer of PCB board 11 are gradually reduced in proportion from the top surface to the bottom surface, and the detection and positioning coil 2 of each level is reserved The socket is formed on the socket end 111 on the PCB board 11;

It also includes a copper ring 3 connected to both ends of the detection and positioning coil 2; it also includes a power supply circuit 4 that uses the copper ring 3 as a bridge to connect with the copper ring 3 and leads to the plug-in terminal 111; the power supply circuit 4 is covered with a shell and is connected to the Power supply connection; shell 12 can prevent it from interfering with detection and positioning; all levels of detection and positioning coils 2 are connected in this way, so that a sufficiently strong magnetic field can be generated under alternating current; the generated magnetic field is distributed in a concave shape.

The detection and positioning coils 2 on each layer of PCB board 11 are connected in parallel step by step, and the power supply of each detection and positioning level coil 2 does not interfere with each other, and is only regulated by the total power supply. The current flows into the coil through the power supply circuit 4, and then flows out of the coil.

The detection and positioning coil 2 is an involute racetrack coil;

The horizontal and vertical dimensions of the involute racetrack-shaped coil are reduced by 0.1mm step by step from the top surface to the bottom surface, that is, the horizontal dimension of the coil is gradually: 6.6mm, 6.5mm, 6.4mm, 6.3mm, 6.2mm, 6.1mm , 6.0mm, 5.9mm, 5.8mm, 5.7mm; the longitudinal dimensions are: 5.0mm, 4.9mm, 4.8mm, 4.7mm, 4.6mm, 4.5mm, 4.4mm, 4.3mm, 4.2mm, 4.1mm;

The length of the straight portion of the involute racetrack coil is 2 mm to 3 mm.

The base 1 is made of glass fiber cloth-based FR-4 material, and the thickness of each layer of PCB board 11 is 0.1mm; and the space between each layer is 0.04~0.01mm.

The copper material of the detection and positioning coil 2 has a thickness of 35um and a width of 0.2mm to 0.25mm. The involute racetrack coil gradually shrinks from the outside to the inside, with a total of 6 turns, and the distance between each turn is 0.1mm to 0.15mm.

The diameter of the copper ring 3 is 500um.

The frequency of the sinusoidal alternating current passing through the detection and positioning coil 2 is 2300kHz to 2600kHz, and the peak voltage in normal operation is 450mV.

The size of the casing 12 is greater than the sum of the detection and positioning coils 2 of each layer. The size of the casing 12 is 1.4mm high, 3cm long, and 2cm wide.

The insertion end 111 of the PCB board 11 is also set to be L-shaped, the length of the bent section at the tail of the L-shaped insertion end 111 is 33 mm, and the connecting section in the middle of the insertion end 111 is 10 mm. The insertion end 111 can be selected according to the usage habits of the operator or the specific situation of the patient: one is flat; the other is L-shaped. The L-shaped device is designed with a corner, allowing the operator to place his hand on the patient's posterior molars for operation. Compared with the straight-line type, it is more conducive to areas with poor visibility of the posterior molars, which is convenient for detection and positioning. The linear type is more suitable for the detection and positioning of the full-mouth and half-mouth areas with a relatively open field of vision.

The present invention includes the following manufacturing methods:

6 to 10 layers of PCB boards are used, and the PCB boards 11 of each layer are pushed into the corresponding slots 121 in the shell from top to bottom according to the order of coil size from large to small, and the PCB boards 11 of each layer are fixed through the slots 121 .

The detection and positioning method of the present invention comprises the following steps:

Step 1. Insert the PCB base 1 wound with the detection and positioning coil 2 into the probe of the detection and positioning device, and then extend the probe into the vicinity of the teeth in the oral cavity;

Step 2 starts the power supply of the detection and positioning device, and a high-frequency current will pass through the detection and positioning coil 2, thereby generating a periodically oscillating magnetic field around the detection and positioning coil 2;

Step 3. When the magnetic field interacts with the metal dental implant buried in the gum, an induced electromotive force will be generated in the metal dental implant, and then an induced current will be generated, and the magnetic field generated by the induced current will hinder the change of the original magnetic field. Therefore, it will cause the change of the current in the detection and positioning coil 2, and finally the detection device on the detection and positioning device will send an alarm signal according to the change of the current; because the 6~10 detection and positioning coils 2 in the PCB substrate 1 have asymmetry , so that the strength of the magnetic field is different up and down. When the probe is in the middle of the upper and lower teeth, the probe can also quickly distinguish the metal dental implant, and then move the probe to achieve accurate positioning.

In described step 3, the magnetic induction intensity calculation formula of the detection and positioning coil (2) of involute runway shape is:

Taking the front coil as the xoy plane, the coordinate origin is located at the center of the central hole, so the distribution of the magnetic field above the xoy plane on the central axis is obtained as:

On the central axis, the distribution of the magnetic field below the xoy plane is:

Finally, on the central axis, the total magnetic field distribution is:

。

.

The present invention is a device based on PCB to improve the sensitivity and accuracy of detecting and locating oral implants, which can not only quickly identify whether the implant is in the upper jaw or the lower jaw, but also determine its specific position. Compared with the detection and positioning of the upper and lower coils used by the traditional detection and positioning head, this patent uses 6-layer to 10-layer coils, which can not only increase the accuracy and speed of detection and positioning, but also solve the problem of energizing the multi-layer coils.

In this patent, the coils at all levels are connected in parallel, and the magnetic fields generated by each coil do not cancel each other, so a strong enough magnetic field can be generated when the same alternating current is used, thereby speeding up the speed and accuracy of detection and positioning.

Apparently, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Claims (10)

1. An oral implant detects and positioner which characterized in that:

the PCB packaging structure comprises a substrate (1) consisting of 6 to 10 layers of PCB boards (11) and a plastic shell (12), wherein 6 to 10 layers of slots (121) are correspondingly arranged in the shell (12), and the PCB boards (11) are inserted into the slots (121);

each layer of PCB (11) is provided with a detection and positioning coil (2), the detection and positioning coil (2) on each layer of PCB (11) is gradually reduced in equal proportion from the top surface to the bottom surface, and a reserved socket of each detection and positioning coil (2) is arranged at a plug-in end (111) formed on the PCB (11);

the device also comprises a copper ring (3) connected with the two ends of the detection and positioning coil (2); the power supply circuit (4) is connected with the copper ring (3) and led out to the plug-in end (111) by taking the copper ring (3) as a bridge; the power supply loop (4) is wrapped in the shell (12) and is connected with a power supply; all levels of detection and positioning coils (2) are connected in this way, so that a sufficiently strong magnetic field can be generated under alternating current; the generated magnetic field distribution is concave;

the detection and positioning coils (2) on each layer of PCB (11) are connected in parallel step by step, the power supply of the detection and positioning coils (2) is not interfered with each other and is only regulated and controlled by a main power supply, and current flows into the coils through the power supply loop (4) and then flows out of the coils.

2. The oral implant detection and positioning device of claim 1, wherein: the detection and positioning coil (2) is an involute runway-shaped coil;

the transverse dimension and the longitudinal dimension of the involute racetrack coil are gradually reduced by 0.1mm from the top surface to the bottom surface in an equal proportion, namely the transverse dimension of the coil is gradually: 6.6mm, 6.5mm, 6.4mm, 6.3mm, 6.2mm, 6.1mm, 6.0mm, 5.9mm, 5.8mm, 5.7mm,5.6mm, 5.5mm; the longitudinal dimension of the steel plate is as follows: 5.0mm, 4.9mm, 4.8mm, 4.7mm, 4.6mm, 4.5mm, 4.4mm, 4.3mm, 4.2mm, 4.1mm,4.0mm,3.9mm;

the length of the linear portion of the involute racetrack coil is 2mm to 3mm.

3. The oral implant detection and positioning device of claim 1, wherein:

the substrate (1) is made of glass fiber cloth-based FR-4 material, and the thickness of each layer of PCB (11) is 0.1mm; and the spacing of the layers is 0.04 to 0.01mm.

4. The oral implant detection and positioning device of claim 1, wherein:

the thickness of the copper material of the detection and positioning coil (2) is 35um, the width is 0.2mm to 0.25mm, the gradually-opened racetrack-shaped coil is gradually reduced from outside to inside for 6 circles, and the distance between every two circles is 0.1mm to 0.15mm;

the diameter of the copper ring (3) is 500um.

5. The oral implant detection and positioning device of claim 1, wherein:

the frequency of the sine alternating current passing through the detection and positioning coil (2) is 2300kHz to 2600kHz, and the peak voltage in normal operation is 450mV.

6. The oral implant detection and positioning device of claim 1, wherein:

the size of the shell (12) is larger than the sum of all layers of detection and positioning coils (2), and the height of the shell (12) is 1.4mm, the length of the shell is 3cm, and the width of the shell is 2cm.

7. The oral implant detection and positioning device of claim 1, wherein:

the plug end (111) of the PCB (11) is also L-shaped, the bent section of the tail part of the L-shaped plug end (111) is 33mm in length, and the connecting section of the middle part of the plug end (111) is 10mm.

8. The oral implant detection and positioning device according to any one of claims 1 to 7, comprising the following manufacturing method:

adopt 6 to 10 layers of PCB board (11), each layer of PCB board (11) is according to the order that the coil size is from big to little, pushes in corresponding slot (121) in the shell from top to bottom, fixes each layer of PCB board (11) through slot (121).

9. A detection and positioning method of an oral implant detection and positioning device is characterized in that:

step 1, inserting a PCB substrate (1) wound with a detection and positioning coil (2) into a probe of a detection and positioning device, and extending the probe to the vicinity of teeth in an oral cavity;

step 2, starting a power supply of the detection and positioning device, wherein high-frequency current can pass through the detection and positioning coil (2), and further a periodically oscillating magnetic field is generated around the detection and positioning coil (2);

step 3, after the magnetic field interacts with the metal dental implant embedded in the gum, induced electromotive force is generated in the metal dental implant, so that induced current is generated, the magnetic field generated by the induced current can block the change of the original magnetic field, so that the change of the current in the detection and positioning coil (2) can be caused, and finally, a detection device on the detection and positioning device can send out an alarm signal according to the change of the current; because 6 to 10 detection and positioning coils (2) in the PCB substrate (1) have asymmetry, the magnetic field intensity of the upper part and the lower part of the PCB substrate are different, when the probe is positioned at the middle position of the upper jaw teeth and the lower jaw teeth, the probe can also quickly distinguish the metal tooth implant, and then the accurate positioning effect is achieved by moving the probe.

10. The detecting and positioning method of an oral implant detecting and positioning device according to claim 9, characterized in that in step 3, the magnetic induction calculation formula of the involute runway-shaped detecting and positioning coil (2) is:

the front coil is used as an xoy plane, and the origin of coordinates is located at the center of a center hole, so that the distribution of a magnetic field above the xoy plane on a central axis is as follows:

on the central axis, the distribution of the magnetic field below the xoy plane is:

finally, the total magnetic field distribution on the central shaft is obtained as follows:

。

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