KR102590340B1 - ultraviolet irradiation apparatus for surface treatment of dental implant - Google Patents

Abstract

In order to modify the surface of the implant to be hydrophilic so as to improve osseointegration with periodontal tissue, the present invention includes a case in which an inlet through which air flows in is formed along the side wall and the upper part is open; An ultraviolet light source unit disposed inside the case to surround a modification space in which the implant surface modification object is accommodated; and a blowing fan that blows air introduced into the inlet to dissipate heat from the ultraviolet light source.

Description

{ultraviolet irradiation apparatus for surface treatment of dental implant}

The present invention relates to an ultraviolet irradiation device for surface treatment of implants, and more specifically, to an ultraviolet irradiation device for surface treatment of implants for modifying the surface of an implant to be hydrophilic so as to improve osseointegration with periodontal tissue.

In general, an implant refers to a substitute that can replace human tissue when the original human tissue is lost, but in dentistry, it refers to the transplantation of artificially made teeth. In other words, it is a technology that restores the function of the tooth by implanting a fixture made of a material that is not rejected by the human body into the alveolar bone where the tooth has fallen out to replace the lost tooth root, and then fixing the artificial tooth.

In the case of general prosthetics or dentures, the surrounding teeth and bones are damaged over time, but dental implants can prevent damage to surrounding tooth tissue and can be used stably because they do not cause secondary cavities. In addition, since the dental implant has the same structure as a natural tooth, there is no pain in the gums or foreign body sensation, and it has the advantage of being able to be used semi-permanently if properly managed.

Here, the dental implant procedure involves the first procedure of installing a fixture into the alveolar bone, waiting for the time (3 to 6 months) for the fixture to be osseointegrated into the alveolar bone, and then fixing the final prosthesis (crown). It includes secondary procedures.

In detail, the first procedure includes a gum removal step in the area where the tooth is missing, a multi-step drilling step to form a hole into which the fixture will be installed, a fixture installation step, and a step of joining the temporary tooth to the installed fixture. .

After the first procedure, the temporary teeth attached to the fixture are separated after a certain recovery period for osseointegration, the regenerated gums around the temporary teeth are removed, and the final prosthesis is inserted and fixed through the second procedure. The dental implant procedure is completed.

Meanwhile, the material used for the dental implant, especially the fixture placed in the alveolar bone, must not only be made of a biocompatible material that is very stable for human biological tissue, but must also have no chemical or physiological reactivity or rejection by the human body. In addition, selecting an appropriate material is very difficult because mechanical strength must be high to prevent deformation or destruction even under repeated loads and momentary pressure.

Accordingly, attempts are being made to develop various metals and alloys as suitable materials for the fixture, but titanium metal or titanium alloy is currently mainly used. Here, the titanium or titanium alloy is not only easy to process, but also has high biocompatibility with human biological tissues, high mechanical strength, and bioinertness. However, titanium and its alloys themselves take a long time to osseointegrate when implanted in the human body, and an oxide film is created, which ensures stability compared to other metals. However, in recent years, there has been a need for further improved safety in the human body.

Accordingly, in order to compensate for these shortcomings, technologies that can improve osseointegration by appropriately treating the surface of fixtures made of the above materials are being developed and applied. In detail, the rate and quality of osseointegration are closely related to the surface properties and chemical composition of the fixture, such as surface composition, surface roughness, and hydrophilicity. In particular, fixtures with highly hydrophilic surfaces are known to be advantageous for interaction with biological solutions, cells, and tissues.

Therefore, the existing fixture with a titanium dioxide (TiO ₂ ) oxide film coated on the surface of titanium is not only stable in the body, has excellent biocompatibility, and has a positive reaction with cells, but also has a better osseointegration ability when placed than a fixture that only undergoes mechanical processing. It has been reported that there is significant improvement.

In order to coat such a titanium oxide film on the surface of a fixture, technologies such as plasma spraying, sputtering, and ion implantation have been disclosed.

However, after the surface of the fixture is treated with an oxide film, it becomes stabilized as carbon atoms are combined over time. Because of this, it is converted to a hydrophobic surface in a low-energy state, so when such a fixture is implanted as is in the alveolar bone, the osseointegration ability is reduced, and if the surface is contaminated with organic matter, there is a serious problem of causing inflammation while the fixture is implanted. there was.

Accordingly, some products including storage containers to maintain the hydrophilic properties of surface-modified fixtures for a long time have been released. However, fixtures containing such storage containers are expensive, which poses a problem as a financial burden to consumers. In addition, since products from specific companies had to be used, there was a problem that consumers had a very narrow range of choices despite their high prices.

To solve this problem, some ultraviolet irradiation devices for surface treatment have recently been disclosed that can irradiate ultraviolet rays after mounting the fixture inside to reform the surface of the fixture and remove organic contaminants attached to the surface.

However, the conventional ultraviolet ray irradiation device for surface treatment described above had a problem in that implant placement could not proceed quickly because the fixture had to be exposed to ultraviolet rays for more than 2 to 3 hours to modify the surface of the fixture. Additionally, since the fixture is heated by being exposed to ultraviolet rays for a long period of time, it takes more time to cool it. In addition, when installing a fixture that has not been properly cooled, the tissue in the treatment area of the recipient may be damaged, which further poses a problem that acts as a negative factor in stable osseointegration.

Moreover, in the conventional ultraviolet irradiation device for surface treatment, as the fixture is separated from the ampoule in which the fixture is accommodated and then mounted inside the irradiation device, the time during which the fixture is exposed to the external environment is substantially extended, causing secondary damage. There was a problem with contamination. In addition, the conventional ultraviolet irradiation device for surface treatment has the problem of exposing users to a harmful environment because the amount of ozone generated increases as the exposure time to ultraviolet rays for surface modification of the fixture increases.

Meanwhile, some packaging containers have been disclosed in which an ultraviolet irradiation lamp is provided in the container portion where the fixture is individually packaged. However, the cost of manufacturing each packaging container is high, which increases the overall cost of the implant, and if the provided lamp is defective or damaged by external factors, there is a problem in that the surface of the fixture cannot be substantially modified.

Korean Patent Publication No. 10-2018-0086967

In order to solve the above problems, the present invention aims to provide an ultraviolet irradiation device for surface treatment of implants to modify the surface of the implant to be hydrophilic so as to improve osseointegration with periodontal tissue.

In order to solve the above problem, the present invention includes a case having an inlet formed along a side wall through which air flows in and an open top; An ultraviolet light source unit disposed inside the case to surround a modification space in which the implant surface modification object is accommodated; and a blowing fan that blows air introduced into the inlet to dissipate heat from the ultraviolet light source unit, wherein a plurality of ultraviolet light source units are arranged along the circumferential direction to surround the modification space to emit ultraviolet rays for surface modification of the implant surface modification object. It includes an LED lamp that emits a wavelength, and a heat sink portion disposed outside the LED lamp and provided with a plurality of heat dissipation fins connected to the case, wherein each heat dissipation fin is spaced between the case and the ultraviolet light source unit at a predetermined distance from each other. It is provided radially and extends in the vertical direction of the case, and one side of each heat radiation fin is connected to one of the plurality of ultraviolet light source units and the other side is connected to the inner wall of the case. Provides a device.

Here, the implant surface modification object includes an implant whose surface is modified by irradiation with ultraviolet rays, and an ampoule unit including an ultraviolet ray projection window that is hollow to accommodate the implant therein and is made of a material that transmits ultraviolet rays, The implant surface modification object is preferably inserted and placed in the modification space in the longitudinal direction of the implant, and is placed so as to surround the ultraviolet light source unit along the circumferential direction.

In addition, it is preferable to further include a cover part that selectively covers the upper part of the case, and a control part that controls the operation of the blowing fan and the ultraviolet light source part.

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At this time, an outlet through which air is discharged is formed in the cover part, and the blowing fan is preferably disposed inside the cover part to discharge air flowing into the inlet towards the outlet.

Through the above solutions, the ultraviolet irradiation device for surface treatment of implants according to the present invention provides the following effects.

First, the ultraviolet light source unit surrounds the ampoule unit and is disposed with a minimum gap, and vacuum ultraviolet rays in the UV-C range with a high light intensity under vacuum pressure are irradiated to the fixture with minimal attenuation in the air, so that high-energy ultraviolet rays are The entire circumferential surface of the fixture can be quickly and uniformly modified and sterilized in a short time.

Second, the heat sink unit, which is radially disposed to increase the heat transfer area between the ultraviolet light source unit and the case, exchanges heat generated from the ultraviolet light source unit during surface modification with external air introduced through the inlet hole and discharges the ultraviolet rays to the outside. Deterioration of surface modification ability due to overheating of the light source unit and the ampoule unit can be prevented.

Third, the ampoule part is made of quartz, so the transmittance of ultraviolet rays is improved, and the outside of both ends closed by the stopper is sealed with a heat-shrinkable vinyl cover, so that it is substantially in a sealed state similar to a vacuum pressure state, so the irradiation efficiency of ultraviolet rays is high. This can be further improved.

Figure 1 is a perspective view showing an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention.
Figure 2 is an exploded perspective view showing an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention.
Figure 3 is a cross-sectional view showing an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention.
Figure 4 is an enlarged view of portion 'A' of Figure 3.
Figure 5 is a block diagram showing an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention.
Figure 6 is an exploded perspective view showing a modified example of an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention.

Hereinafter, an ultraviolet irradiation device for surface treatment of implants according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a perspective view showing an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention, and Figure 2 is an exploded perspective view showing an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention. And, Figure 3 is a cross-sectional view showing an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention, and Figure 4 is an enlarged view of portion 'A' of Figure 3. And, Figure 5 is a block diagram showing an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention. Here, the implant is preferably understood as a prosthesis installed inside the oral cavity to replace lost natural teeth, and particularly as a fixture (f) installed in the alveolar bone. In addition, the ultraviolet irradiation device 100 for surface treatment of the implant is preferably understood as a device that enables hydrophilic surface modification by irradiating ultraviolet rays to the surface of the fixture f.

As shown in Figures 1 to 5, the ultraviolet irradiation device 100 for surface treatment of implants according to an embodiment of the present invention includes an ultraviolet light source unit 20, a blowing fan 30, and an ampoule unit 50. It is provided. At this time, a case 10 is provided in which an internal space is formed to accommodate the above-mentioned components, and a cover portion 40 that can be selectively opened and closed may be provided on one side of the case 10.

Meanwhile, the case 10 is formed with an open upper part so that the ultraviolet light source unit 20 and the ampoule unit 50 are disposed inside, and a plurality of holes through which air flows along the lower side of the side wall of the case 10 An inlet portion 11 through which the inlet hole 11a penetrates may be formed.

Here, the case 10 may be provided in the shape of a cube, rectangular parallelepiped, column, etc. with one side open to accommodate the ultraviolet light source unit 20 and the ampoule unit 50 therein. At this time, the case 10 supports the upper part where the ultraviolet light source part 20 and the ampoule part 50 are disposed, and the lower part of the ampoule part 50, and has a plurality of inlet holes 11a on the side wall. It may be divided into a lower part including the formed inlet 11.

Accordingly, since the ultraviolet light source unit 20 and the ampoule unit 50 are accommodated inside the case 10, malfunction of the machine due to penetration of foreign substances, etc. can be prevented and external aesthetics can be improved.

In addition, a plurality of the inlet holes 11a are disposed along the lower side of the side of the case 10, so that external air can flow into the inlet holes 11a as the blowing fan 30 rotates. Accordingly, since the outside air discharges the heat generated by the surface modification to the outside of the case 10, heat transfer performance is improved, and the durability of the ultraviolet irradiation device 100 for surface treatment of the implant can be improved.

Of course, in some cases, the inlet portion may be disposed along the entire side wall of the case 10. At this time, a plurality of the inlet holes are arranged along the side wall of the case 10, so that external air can flow into the inlet holes as the blowing fan 30 rotates. Accordingly, since the inlet hole is formed on the entire side wall of the case 10, heat transfer performance can be improved compared to the case where the inlet hole is formed only on the lower side of the side wall.

Meanwhile, at least one ultraviolet light source unit 20 is provided and disposed on the central side of the inside of the case 10, and is preferably arranged to surround the side portion of the modification space s whose upper surface is opened to accommodate the implant surface modification object. do.

Here, the ultraviolet light source unit 20 may include a plurality of LED lamps arranged along the circumferential direction to surround the modification space s and emit ultraviolet wavelengths for surface modification of the implant surface modification object. there is.

At this time, the LED lamp can irradiate far ultraviolet rays in the UV-C range with a wavelength of 100 to 200 nm. These far-ultraviolet rays are emitted in large quantities, have a large amount of light, and have high energy of a short wavelength, so the surface of the fixture f can be quickly modified in a short time. In addition, far-ultraviolet rays in the UV-C range with a wavelength of 200 to 280 nm are irradiated to the implant surface modification object. Accordingly, the oxygen molecules present inside the ampoule portion 50 in which the fixture f is packaged are converted into ozone, a reactive generator, as the outer electrons are converted into an excited state through an energy impact exceeding the binding energy. . Through this, as the carbon atoms deposited on the surface of the fixture (f) are combined with the ozone and separated, the surface of the fixture (f) can be converted from hydrophobic in a low energy state to hydrophilic in a high energy state.

In addition, a plurality of the LED lamps may be arranged at preset intervals along the longitudinal direction of the implant surface modification object. Additionally, a plurality of LED lamps may be arranged surrounding the implant surface modification object in a circumferential direction.

Here, the conventional problem of heating the fixture (f) due to long-term exposure to near-ultraviolet rays with a relatively low energy of 400 nm or less for surface modification is solved, so a separate complicated cooling means is not required, and an ultraviolet irradiation device is used. Can be provided compactly.

Of course, in some cases, the ultraviolet light source unit 20 includes a plurality of containers 21 in a vacuum pressure state arranged to surround the reforming space s, and is disposed inside the container 21 to emit ultraviolet rays with a wavelength of 100 to 280 nm. It may also be provided as an excimer lamp including a discharge electrode 22 that emits.

In detail, the ultraviolet light source unit 20 is preferably provided inside the case 10 so that ultraviolet rays are irradiated into the reformed space s on the inner side. At this time, a seating portion extending upward from the inner bottom surface of the case 10 and having a flat upper surface may be formed on the center side of the lower end of the case 10 so that the ultraviolet light source unit 20 is seated. Accordingly, the ultraviolet light source unit 20 may be disposed on the upper side of the seating portion and at the center of the upper end of the case 10.

Here, when the ultraviolet light source unit 20 is provided as an excimer lamp, the ultraviolet light source unit 20 is provided in a vacuum pressure state in which the discharge gas is filled inside the container 21 made of quartz, and the discharge gas is inside the container 21. Electrodes 22 may be provided. In detail, the discharge gas may be a halogen gas such as fluorine or chlorine, or a gas such as xenon or krypton. Additionally, the discharge electrode 22 may be provided in the form of a rod, spring, pipe, or conductive tape. In addition, the discharge electrode 22 is made of conductive materials with excellent electrical conductivity such as aluminum, aluminum alloy, duralumin, copper and copper alloy, and conductive coating such as silver paste, ITO (Indium Tin Oxide), and ATO (Aluminum Tin Oxide). It may be formed of any selected alloy steel such as stainless steel, which has excellent solution and resilience.

In this excimer lamp, excimer molecules (molecules in an excited state) are formed as the discharge gas filled in the container 21 under vacuum pressure is discharged by the electric force formed at the discharge electrode. And, when the excimer molecule transitions to the ground state, it emits ultraviolet rays of a preset wavelength. Therefore, according to the present invention, the surface of the fixture (f) can be modified to be hydrophilic through ultraviolet rays irradiated from the excimer lamp, and sterilization and cleaning can be performed simultaneously by decomposing or removing remaining organic matter.

At this time, the excimer lamp may irradiate far ultraviolet rays, especially vacuum ultraviolet rays, in the UV-C range with a wavelength of 100 to 200 nm inside the container 21 under vacuum pressure. These vacuum ultraviolet rays are emitted in large quantities under vacuum pressure, have a large amount of light, and have high energy of a short wavelength, so the surface of the fixture f can be quickly modified in a short time.

In addition, far ultraviolet rays in the UV-C range with a wavelength of 200 to 280 nm are irradiated through the container 21. Accordingly, the oxygen molecules present inside the ampoule portion 50 in which the fixture f is packaged are converted into ozone, a reactive generator, as the outer electrons are converted into an excited state through an energy impact exceeding the binding energy. . Through this, as the carbon atoms deposited on the surface of the fixture (f) are combined with the ozone and separated, the surface of the fixture (f) can be converted from hydrophobic in a low energy state to hydrophilic in a high energy state.

Moreover, since the container 21 is made of quartz, which has a lower absorption coefficient than commonly used glass or reflective synthetic resin containers, the ultraviolet ray transmittance can be significantly increased, and the sterilizing power of ultraviolet rays can be preserved. Through this, the far-ultraviolet rays irradiated from the ultraviolet light source unit 20 are substantially transmitted into the interior of the ampoule unit 50 disposed adjacent to the outer surface 20a of the container 21, thereby providing surface modification and sterilization/cleaning. performance can be significantly improved. At this time, it is preferable that the outer surface 20a of the container 21 and the outer surface 20a of the ultraviolet light source unit 20 are understood to have substantially the same meaning.

At this time, the ultraviolet light source unit 20 is provided in plural and disposed inside the case 10, and is preferably disposed to surround a side portion of the modification space s whose one side is open to accommodate the implant surface modification object.

Here, the implant surface modification object is the ampoule including an implant whose surface is modified by irradiation of ultraviolet rays, and an ultraviolet ray projection window 51 that is hollow and made of a material that transmits ultraviolet rays so that the implant can be accommodated therein. It may include part 50. At this time, the implant surface modification object refers to the fixture (f) whose surface is modified to become hydrophilic as ultraviolet rays are irradiated on the surface, or the ampoule unit 50 that stores the fixture (f) inside, or the It is preferable to understand it as either a configuration that simultaneously encompasses the fixture (f) and the ampoule portion 50, or an implant that requires surface modification.

In addition, the implant surface modification object is preferably inserted and placed in the modification space s in the longitudinal direction of the implant, and is placed so as to be surrounded by the ultraviolet light source unit 20 along the circumferential direction. At this time, the modification space (s) is preferably understood as a space where the implant surface modification object is placed for surface modification. Here, one side of the modification space s is opened to allow the implant surface modification object to be inserted, while the other side may be blocked by the seating portion of the case 10. At this time, the seating portion supports the implant surface modification object to be seated, and one side of the seating portion is formed to penetrate, so that external air flowing in from the inlet hole 11a may flow into the modification space s. In addition, the side wall surface of the reformed space s may be blocked by the inner wall surface of each of the ultraviolet light source units 20. That is, the modification space s has one side open to accommodate the implant surface modification object, the side is blocked by the inner wall of each ultraviolet light source unit 20, and the other side is blocked by the seating portion of the case 10. It is desirable to understand it as a space blocked by

Meanwhile, each of the ultraviolet light source units 20 is provided in a shape such as a rectangular parallelepiped, and the discharge electrode 22 may be disposed at the center of the container 21 in the longitudinal direction. At this time, four ultraviolet light source units 20 may be provided so that the shape of the reformed space s is a hexahedral space, and each pair may be spaced apart from each other with the reformed space s in between. Through this, the implant surface modification object can be inserted into and placed on one side of the modification space s formed on the inner surface of the ultraviolet light source unit 20. At this time, since the distance between the implant surface modification object and the ultraviolet light source unit 20 is arranged at substantially constant intervals, the amount of ultraviolet radiation can be uniformly delivered to the outer surface of the implant surface modification object.

Therefore, unlike the prior art in which the surface modification level was non-uniform depending on the distance from the light source, in the present invention, the distance from the ultraviolet light source unit 20 to the implant surface modification object is substantially the same, so that the surface of the fixture (f) The level of modification can be uniformly adjusted. Through this, when the surface of the fixture (f) is modified using the ultraviolet irradiation device 100 of the present invention, the fixture (f) accommodated in each ampoule unit 50 is substantially modified to the corresponding level, thereby minimizing the defect rate. Therefore, the reliability of surface treatment can be improved.

Additionally, in some cases, a plurality of the implant surface modification objects may be inserted into the modification space s in the longitudinal direction to undergo surface modification. At this time, the longitudinal length of the modification space s may be formed to correspond to the length of the implant surface modification object. Through this, since a plurality of the implant surface modification objects are simultaneously surface modified to a certain level, productivity can be significantly improved as manufacturing costs and manufacturing parts are reduced.

Of course, in some cases, the container may be provided in the shape of a rectangular parallelepiped or cube with a hollow formed in the longitudinal direction, and a plurality of discharge electrodes may be arranged at predetermined intervals inside the container.

Meanwhile, the ultraviolet light source unit 20 preferably includes a heat sink unit 23 disposed outside the LED lamp and provided with a plurality of heat dissipation fins connected to the case 10. Here, each of the heat sink fins of the heat sink portion 23 is provided between the case 10 and the ultraviolet light source portion 20, and surrounds the LED lamp to increase the heat transfer area and is radially arranged at a preset distance between them. desirable. At this time, one side of each heat radiation fin may be connected to one of the plurality of ultraviolet light source units 20, and the other side may be connected to the inner wall of the case 10. Additionally, the heat sink portion 23 may be made of a metal material with high thermal conductivity.

In addition, each of the heat dissipation fins may be spaced apart from each other at a preset interval and may be provided to extend in the vertical direction of the case 10. At this time, external air introduced from the inlet hole 11a may flow into the space between each heat dissipation fin.

Accordingly, when the surface of the implant surface modification object is modified, the heat generated from the ultraviolet light source unit 20 is conducted to the heat sink unit 23 and is cooled by external air flowing in from the inlet hole 11a to the case ( 10), the heat transfer performance of the ultraviolet irradiation device 100 for surface treatment of the implant can be significantly improved. Moreover, since the heat sink unit 23 is radially disposed entirely between the outer side of the ultraviolet light source unit 20 and the inner wall surface of the case 10, the heat sink unit 23 is connected to the ultraviolet light source unit 20 and the case ( 10), the cross-sectional area is enlarged compared to the case where they are arranged at right angles to each other, so heat transfer performance can be further improved.

Therefore, the heat sink portion 23, which is radially disposed to increase the heat transfer area between the ultraviolet light source portion 20 and the case 10, transmits heat generated from the ultraviolet light source portion 20 during surface modification through the inlet hole ( Since heat is exchanged with the external air introduced through 11a) and discharged to the outside, a decrease in surface modification ability due to overheating can be prevented.

Of course, in some cases, the heat sink unit may be configured to be arranged at right angles to the outside of the ultraviolet light source unit 20 and the inner wall surface of the case 10. At this time, since each heat radiation fin is disposed at a right angle between the ultraviolet light source unit 20 and the case 10, the heat radiation fin may not be disposed between the diagonal outside of the ultraviolet light source unit 20 and the diagonal inside of the case 10. there is. Accordingly, since the heat sink portion is simply disposed at a right angle between the ultraviolet light source portion 20 and the case 10, the manufacturing process is easier than when the heat sink portion is disposed radially, thereby reducing manufacturing cost and manufacturing time.

Meanwhile, the ampoule unit 50 is a dental implant in which ultraviolet rays irradiated from the ultraviolet light source unit 20 are accommodated therein, that is, the ultraviolet ray projection window 51 through which the ultraviolet rays transmitted to modify the surface of the fixture (f) is circumferential. It is formed along a direction and can be provided with a sealed interior. Here, the ampoule unit 50 may be inserted into the reforming space s with the fixture f disposed therein.

In detail, the ultraviolet ray projection window 51 is provided in the shape of a hollow cylinder with openings at both ends, and is preferably made of a projection quartz material. That is, since the container 21 of the ultraviolet light source unit 20 and the ultraviolet projection window 51 of the ampoule unit 50 are made of quartz material with high ultraviolet transmittance, the ultraviolet rays emitted from the ultraviolet light source unit 20, especially , vacuum ultraviolet rays may be substantially transmitted and irradiated onto the surface of the fixture (f).

Additionally, stoppers 52a and 52b may be provided to cover both open ends of the ultraviolet ray projection window 51. Here, the inner end of the stopper portion 52a corresponding to the upper end of the fixture f may be provided with a binding portion into which the inner peripheral surface of the upper end of the fixture f is fitted. At this time, at least one through passage formed in the longitudinal direction may be formed on the inner periphery of the stoppers 52a and 52b to increase the amount of oxygen inside the ultraviolet ray projection window 51 required during surface modification.

In addition, the stopper portion (52b) disposed at the bottom of the fixture (f) has an edge that protrudes radially at a plurality of ultraviolet ray transmission intervals along the circumferential direction, and the end of the fixture (f) is located at the inner end. A point-contact support unit (not shown) may be provided.

Furthermore, a coupling groove (not shown) may be formed at the outer lower end of the stopper 52b to fit into a coupling protrusion (not shown) protruding from the case 10 into the reforming space s. In detail, the engaging protrusion (not shown) may be provided to extend upward and protrude from the central portion of the seating portion of the case 10. Additionally, the engaging groove (not shown) may be formed on the center side of the outer lower end of the stopper 52b, corresponding to the engaging protrusion (not shown) and recessed inward in the longitudinal direction. Accordingly, when the ampoule part 50 is inserted into the reforming space s, the coupling protrusion (not shown) is fitted with the coupling groove (not shown) formed in the stopper part 52b, thereby forming the ampoule part 50. ) can be fixed. Therefore, even if the process of inserting and withdrawing a plurality of the ampoule units 50 into the modification space s is repeated, the accuracy of surface modification can be improved because the placement position is guided at uniform intervals from the ultraviolet light source unit 20. there is.

In addition, the connecting portion of the stoppers 52a and 52b and the ultraviolet ray projection window 51 may be sealed by heat-shrinkable vinyl covers 54a and 54b that shrink by heat. Accordingly, the interior of the ampoule unit 50 may also be provided in a sealed state similar to the vacuum pressure state of the ultraviolet light source unit 20. Accordingly, when vacuum ultraviolet rays are exposed to the air, their energy is prevented from being attenuated, so that they substantially penetrate the ultraviolet light source unit 20 and the ampoule unit 50 disposed adjacent thereto and reach the surface of the fixture f. can do.

Through this, the present invention significantly improves the surface modification ability and sterilization/cleaning ability of the fixture (f) through ultraviolet rays in the UV-C range, which have excellent surface modification and sterilization/cleaning power, while shortening the processing time, thereby improving the overall process of implant placement. This can be done quickly. In addition, sanitation can be further improved because it is possible to substantially block contaminants such as organic substances from penetrating through the connecting portion of the stoppers 52a and 52b and the ultraviolet ray projection window 51.

Of course, in some cases, the ultraviolet ray projection window may be provided in the shape of a cylindrical container with at least one side open, and the coupling groove may be formed in the stopper or on one covered surface of the ultraviolet ray projection window. That is, the ampoule part may have a stopper formed only on one of the upper and lower ends, and the ultraviolet ray projection window may be formed only on one side where the stopper is formed. For example, the ampoule unit may be configured to include an ultraviolet ray projection window with an open top, and a stopper disposed at the open top of the ultraviolet ray projection window, and the lower end of the ampoule portion may be seated on the seating portion of the case 10. . At this time, it is preferable to understand that the lower part of the ampoule part is sealed by the ultraviolet ray projection window. Here, on the inner surface of the sealed lower portion of the ultraviolet ray projection window, a border is protruded radially at a plurality of ultraviolet ray transmission intervals along the circumferential direction, and a support portion (not shown) with which the end of the fixture (f) is in point contact at the inner end. ) may be provided.

Meanwhile, the ampoule unit 50 may be inserted into the open surface of the reforming space s and placed and seated in a form surrounded by the ultraviolet light source unit 20. At this time, the reforming space (s) is preferably provided in a size that substantially corresponds to the outer circumference of the ampoule unit (50).

Accordingly, the outer peripheral surface of the ampoule unit 50 and the inner surface of the ultraviolet light source unit 20 are arranged adjacent to each other with a substantially minimum gap, so that surface modification can proceed. Therefore, far ultraviolet rays, especially vacuum ultraviolet rays in the 190-230 nm wavelength range irradiated from the ultraviolet light source unit 20, penetrate the container 21 and at the same time substantially penetrate the continuously arranged ultraviolet projection window 51. It can reach the inside of the ampoule unit 50. Through this, the surface modification and sterilization/cleaning efficiency of the fixture (f) can be further increased through high-energy ultraviolet rays.

Here, the outer peripheral surface of the ampoule unit 50 and the inner surface of the ultraviolet light source unit 20 may be spaced apart at a substantially fine interval. Accordingly, the outer peripheral surface of the ampoule unit 50 is disposed as close to the inner surface of the ultraviolet light source unit 20 as possible while being spaced apart, thereby preventing frictional interference.

Meanwhile, the cover part 40 is opened so that one side of the hollow body selectively covers the upper part of the case 10, and the air flowing into the inlet hole 11a is discharged from the other side of the hollow body. It is preferable that the discharge portion is formed through the discharge hole 40a.

Here, it is preferable that the outer circumference of the cover part 40 has a shape corresponding to the outer circumference of the case 10. At this time, the lower side of the cover portion 40 may be fitted into the upper side of the case 10.

In detail, a first fitting protrusion (41b) may be formed on the outside of one edge of the cover part 40 by extending toward the case 10, and a first step may be formed on the inside of one edge of the cover part 40. (41a) can be formed. In addition, on the end edge of the case 10 opposite to the cover part 40, the inner side of the end protrudes toward the cover part 40 to form a second fitting protrusion 13a, and the outer side of the end may be formed. A second step portion 13b may be formed.

Accordingly, when the cover part 40 is coupled to the case 10, the first fitting protrusion (41b) is fitted into the second step part (13b), and the second fitting protrusion (13a) is inserted into the second step part (13b). The case 10 and the cover portion 40 may be coupled by being inserted into the first step portion 41a.

Meanwhile, it is preferable that the discharge part penetrating the discharge hole 40a through which the air introduced through the inlet hole 11a is discharged is formed on the other side of the cover part 40. Here, the discharge hole 40a may be formed in a circular shape penetrating the other surface of the cover part 40, corresponding to the maximum diameter of the blowing fan 30. Of course, in some cases, a plurality of discharge holes 40a may be formed through the entire other surface of the cover part 40 at preset intervals.

Accordingly, the air flowing into the inlet hole 11a flows upward by the blower fan 30 and exchanges heat in the process of passing through the heat sink part 23, and the heated air flows through the discharge hole 40a. ) and can be discharged to the outside of the ultraviolet irradiation device 100 for surface treatment of the implant.

Meanwhile, the blowing fan 30 is preferably provided to blow air flowing into the inlet 11 to the discharge part to discharge heat generated by the ultraviolet light source unit 20 to the outside. At this time, the blowing fan 30 preferably includes a rotation shaft disposed in the vertical direction at the inner center of the cover portion 40 and a plurality of blades provided radially outside the rotation shaft.

In addition, the blowing fan 30 is installed inside the cover part 40 to discharge the air flowing into the inlet part 11 to the discharge part when the cover part 40 is coupled to the case 10. It can be provided in . Here, it is preferable that the blade shape of the blowing fan 30 is arranged so that the air inside the case 10 and the cover part 40, which are coupled to each other, flows to the outside as the blowing fan 30 rotates.

Through this, the blowing fan 30 introduces air from the outside of the ultraviolet irradiation device 100 for surface treatment of the implant, exchanges heat generated by surface modification through the air, and discharges it to the outside, thereby preventing mechanical damage due to high temperature. Misoperation, etc. can be prevented.

Additionally, the rotation axis of the blowing fan 30 may be arranged to cover one side of the reforming space s when the case 10 and the cover part 40 are combined. At this time, a blocking member (not shown) may be further provided at the end of the rotating shaft to cover one open surface of the reforming space s. That is, the blocking member (not shown) is connected to the rotation axis of the blowing fan 30 and is disposed in the central part of one open side of the cover part 40, so that it can cover one side of the reforming space s.

Of course, in some cases, the blowing fan may be placed inside the lower part of the case 10. In detail, a seating support portion (not shown) may be formed in a cylindrical shape inside the lower portion of the case 10 so that the blower fan rotates and the ampoule portion 50 is seated on the upper surface. Here, the blowing fan may be rotated as the rotation axis of the blowing fan is fixed to the outer periphery of the seating support (not shown). Additionally, in some cases, the blowing fan may be provided to allow air to flow in from the discharge part of the cover part 40 and discharge the air to the inlet part 11 of the case 10.

Meanwhile, the engaging guide plate 12 is disposed between the ultraviolet light source unit 20 and one surface of the cover unit 40, and when the ampoule unit 50 is inserted into the reforming space s, the ampoule unit 50 A through hole 12b may be formed in the center so that the upper end of can be caught.

In detail, the engaging guide plate 12 may be provided in a shape such as a square and fixed to the upper side of the case 10 to cover a portion of the LED lamp and the heat sink portion 23. Here, a screw hole 12a may be formed on the outer side of the engaging guide plate 12 into which a screw is inserted to be coupled and fixed to the heat sink portion 23. Accordingly, the engaging guide plate 12 covers the LED lamp and can be placed and fixed on one side of the case 10. Through this, since the engaging guide plate 12 blocks the upper side of the ultraviolet light source unit 20, direct leakage of ultraviolet rays upward can be prevented.

In addition, the through hole 12b may be formed in the center of the engaging guide plate 12 to guide and insert the ampoule portion 50. At this time, the size of the through hole 12b may be substantially corresponding to the size of the ampoule unit 50, and may be provided in a shape such as a square or a circle. At this time, when the engaging guide plate 12 is placed in the case 10, the inside of the through hole 12b is preferably understood as an open surface of the reformed space s.

Accordingly, the ampoule unit 50 is inserted into the through hole 12b of the engaging guide plate 12, and the outer periphery of the stopper 52a of the ampoule unit 50 is caught, so that the ampoule unit 50 When inserted into the reforming space s, direct contact with the ultraviolet light source unit 20 is prevented and interference is minimized, so convenience of use can be significantly improved.

At this time, it is preferable to understand that the engaging guide plate 12 is fixed to the heat sink portion 23, and the ampoule portion 50 is inserted into the reformed space s through the through hole 12b. It is desirable to understand that the cover part 40 is then combined with the case 10 and surface modification proceeds.

Meanwhile, the ultraviolet irradiation device 100 for surface treatment of the implant preferably further includes a control unit 60 that controls the operation of the blowing fan 30 and the ultraviolet light source unit 20. In addition, the ultraviolet ray irradiation device 100 for surface treatment of the implant may further include a switch provided to selectively operate the blowing fan 30 and the ultraviolet light source unit 20. Here, the blowing fan 30 and the ultraviolet light source unit 20 may be connected to the control unit 60 in a circuit to be selectively turned on/off, respectively, through switch operation.

In addition, although not shown in the drawing, the case 10 may be further equipped with a display unit (not shown) that displays the elapsed time of ultraviolet rays irradiated from the ultraviolet light source unit 20. Through this, the user can visually check the elapsed time displayed on the display unit (not shown) and determine the surface modification state of the fixture (f).

Moreover, a sensor unit (not shown) that senses a preset signal when selectively contacted may be further provided on the other surface of the reforming space s where the lower surface of the ampoule unit 50 is seated. That is, when the ampoule unit 50 is inserted and seated in the reforming space s, each opposing surface touches and a contact signal can be detected from the sensor unit (not shown). Then, according to the contact signal, it is determined whether or not the ampoule unit 50 is placed in the reforming space s, and the time at which the ampoule unit 50 is coupled and irradiated with ultraviolet rays is determined to display the display unit (not shown). ) may also be displayed.

Meanwhile, Figure 6 is an exploded perspective view showing a modified example of an ultraviolet irradiation device for surface treatment of implants according to an embodiment of the present invention. Since the basic function of this modified example is the same as the above-described embodiment, detailed description of the same configuration will be omitted.

As shown in Figure 8, the ultraviolet irradiation device 200 for surface treatment of implants according to a modified example of an embodiment of the present invention includes a case 210, an ultraviolet light source unit 220, a blowing fan 230, and a cover unit ( 240). It may be provided including an ampoule unit 250.

Here, the case 210 is formed with one side open so that the ultraviolet light source unit 220 and the ampoule unit 250 are disposed inside, and a plurality of inlet holes 211a are formed along the lower side of the side wall of the case 210. ) may be formed through an inlet 211.

Additionally, the case 210 may be provided in a cylindrical shape with one side open to accommodate the ultraviolet light source unit 220 and the ampoule unit 250 therein. At this time, the case 210 supports the upper end where the ultraviolet light source unit 220 and the ampoule unit 250 are disposed, and the lower end of the ampoule unit 250, and has a plurality of inlet holes 211a on the side wall. It may be divided into a lower part including the formed inlet 211.

Accordingly, since the ultraviolet light source unit 220 and the ampoule unit 250 are accommodated inside the case 210, malfunction of the machine due to penetration of foreign substances, etc. can be prevented and external aesthetics can be improved.

In addition, a plurality of the inlet holes 211a are disposed along the lower side of the side of the case 210, so that external air can flow into the inlet holes 211a as the blowing fan 230 rotates. Accordingly, since the outside air discharges the heat generated by the surface modification to the outside of the case 210, heat transfer performance is improved, and the durability of the ultraviolet irradiation device 200 for surface treatment of the implant can be improved.

Of course, in some cases, the inlet portion may be disposed along the entire side wall of the case 20. At this time, a plurality of the inlet holes are arranged along the side wall of the case 20, so that external air can flow into the inlet holes as the blowing fan 230 rotates. Accordingly, since the inlet hole is formed on the entire side wall of the case 210, heat transfer performance can be improved compared to the case where the inlet hole is formed only on the lower side of the side wall.

Meanwhile, it is preferable that at least one ultraviolet light source unit 220 is provided and disposed at the center of the inside of the case 10. At this time, the ultraviolet light source unit 220 is preferably arranged to surround the side portion of the modification space s whose upper surface is opened to accommodate the implant surface modification object. Here, when provided in plural, the ultraviolet light source unit 220 may be provided in a semi-arc shape and arranged to have a hollow cylindrical shape when fully combined. When provided as one, the ultraviolet light source unit 220 may be provided in a hollow cylindrical shape.

Here, the ultraviolet light source unit 220 preferably includes an LED lamp including a discharge electrode that emits ultraviolet rays and is disposed inside at least one container under vacuum pressure arranged to surround the reforming space s.

In detail, the ultraviolet light source unit 220 is preferably provided inside the case 210 so that ultraviolet rays are irradiated into the reformed space s on the inner side. At this time, a seating portion extending upward from the inner bottom of the case 210 and having a flat upper surface may be formed on the center side of the lower end of the case 210 so that the ultraviolet light source unit 220 is seated. Accordingly, the ultraviolet light source unit 220 may be disposed above the seating portion and toward the upper end of the case 210.

Accordingly, the ultraviolet light source unit 220, which is disposed surrounding the side portion of the modification space s whose upper surface is opened to accommodate the implant surface modification object, is formed in a cylindrical shape and is uniformly aligned with the implant surface modification object along the circumferential direction. Precision can be improved because surface modification progresses evenly as the space is maintained.

Meanwhile, the ultraviolet light source unit 220 preferably includes a heat sink unit 223 disposed outside the LED lamp and provided with a plurality of heat dissipation fins connected to the case 210.

Here, each of the heat dissipation fins of the heat sink portion 223 is provided between the case 210 and the ultraviolet light source portion 220, and surrounds the LED lamp to increase the heat transfer area and is radially arranged at a preset distance from each other. desirable. At this time, one side of each heat radiation fin may be connected to one of the plurality of ultraviolet light source units 220, and the other side may be connected to the inner wall of the case 210. Additionally, the heat sink portion 223 may be made of a metal material with high thermal conductivity.

In addition, each of the heat dissipation fins may be spaced apart from each other at a preset interval and may be provided to extend in the vertical direction of the case 210. At this time, external air introduced from the inlet hole 211a may flow into the space between each heat dissipation fin.

Accordingly, when the surface of the implant surface modification object is modified, heat generated from the ultraviolet light source unit 220 may be heat-conducted to the heat sink unit 223 radially disposed outside the ultraviolet light source unit 220. Therefore, the heat dissipation fin is cooled by the external air flowing in from the inlet hole 211a and the heated air is discharged to the outside of the case 210, so the heat transfer performance of the ultraviolet irradiation device 200 for surface treatment of the implant is improved. It can be significantly improved.

In addition, the heat sink unit 223 is radially disposed between the case 210 and the ultraviolet light source unit 220, which are provided in a cylindrical shape, so that the case 10 is provided in a hexahedral shape as in one embodiment of the present invention. Since manufacturing is easier than in the case of conventional manufacturing, manufacturing time and manufacturing costs can be reduced, thereby improving economic efficiency.

Meanwhile, the engaging guide plate 212 is disposed between the ultraviolet light source unit 220 and one surface of the cover unit 240, and when the ampoule unit 250 is inserted into the reforming space s, the ampoule unit 250 A through hole 212b may be formed in the center so that the upper end of can be caught.

In detail, the engaging guide plate 212 may be provided in a circular shape and fixed to the upper side of the case 210 to cover a portion of the LED lamp and the heat sink portion 223. Here, a screw hole 212a may be formed on the outer side of the engaging guide plate 212 into which a screw is inserted to be coupled and fixed to the heat sink portion 223. Accordingly, the engaging guide plate 212 covers the LED lamp and can be placed and fixed on one side of the case 210. Through this, since the engaging guide plate 212 blocks the upper side of the ultraviolet light source unit 220, direct leakage of ultraviolet rays upward can be prevented.

In addition, the through hole 212b may be formed in the center of the engaging guide plate 212 to guide and insert the ampoule portion 250. At this time, the size of the through hole 212b may be substantially corresponding to the size of the ampoule unit 250, and may be provided in a shape such as a square or a circle. At this time, when the engaging guide plate 212 is placed in the case 210, the inside of the through hole 212b is preferably understood as an open surface of the reformed space s.

Accordingly, the ampoule part 250 is inserted into the through hole 212b of the engaging guide plate 212, and the upper outer periphery of the ampoule part 250 is caught, so that the ampoule part 250 is inserted into the reforming space ( When inserted into s), direct contact with the ultraviolet light source unit 220 is prevented and interference is minimized, so convenience of use can be significantly improved.

Meanwhile, the cover part 240 is opened so that one side of the hollow body selectively covers the case 210, and the other side of the hollow body has a discharge hole through which the air flowing into the inlet hole 211a is discharged. It is preferable that the discharge portion through which (240a) is formed is formed.

Here, the outer circumference of the cover part 240 is preferably provided with a cylindrical shape corresponding to the outer circumference of the case 210. At this time, the lower side of the cover portion 240 may be fitted into the upper side of the case 210.

In addition, it is preferable that the discharge part penetrating the discharge hole 240a through which the air flowing into the inlet hole 211a is discharged is formed on the other side of the cover part 240. Here, the discharge hole 240a may be formed to penetrate into a circular shape on the other surface of the cover part 240, corresponding to the maximum diameter of the blowing fan 230. Of course, in some cases, a plurality of discharge holes 240a may be formed through the entire other surface of the cover part 240 at preset intervals.

Accordingly, the air flowing into the inlet hole 211a flows upward by the blower fan 230 and exchanges heat in the process of passing through the heat sink part 223, and the heated air flows through the discharge hole 240a. ) and can be discharged to the outside of the ultraviolet irradiation device 200 for surface treatment of the implant.

Meanwhile, the ultraviolet irradiation device 200 for surface treatment of the implant further includes an inner frame portion (not shown) that covers the ultraviolet light source portion 220 and the ampoule portion 250 and has an ultraviolet reflective film (not shown) formed on the inner surface. It may be provided.

Here, the inner frame portion (not shown) may be disposed between the outside of the container of the excimer lamp and the inside of the heat dissipation fin, and the ultraviolet reflective film (not shown) may be disposed on the inner peripheral surface of the inner frame portion (not shown). You can. At this time, the inner peripheral surface of the inner frame portion (not shown) may be formed to correspond to the outer peripheral surface of the ultraviolet light source unit 220. Accordingly, ultraviolet rays radiated outward in the radial direction from the ultraviolet light source unit 220 are reflected by the reflective film (not shown) and may be indirectly irradiated to the ampoule unit 250. Through this, the entire surface of the object to be implant surface modified can be substantially modified and the time required for surface modification can be significantly shortened.

At this time, a concave or convex embossed portion may be further formed on the ultraviolet ray reflective film (not shown). Through this, ultraviolet rays are diffusely reflected through the embossed portion of the ultraviolet reflection film (not shown) and irradiated to the fine surfaces of the screw threads, steps, and bottom of the fixture, thereby further improving surface modification ability and sterilization/cleaning ability.

Meanwhile, the ultraviolet light source unit 220 may be provided to be selectively attachable and detachable from the case 210. Through this, the ultraviolet light source unit 220 can be easily separated from the case 210 and then the case 210 can be easily cleaned, thereby preventing deterioration of heat transfer performance and surface modification due to contamination by dust, etc. can do.

Accordingly, the ultraviolet irradiation device (100, 200) for surface treatment of implants according to the present invention is configured such that the implant surface modification object is disposed with a minimum gap with the inner surface of the ultraviolet light source unit (20, 220) and has a high amount of UV-light under vacuum pressure. Vacuum ultraviolet rays in the C range can be irradiated to the implant surface modification object with minimal attenuation in air. In addition, since the ampoule portion 50 is not rotated and the entire circumferential surface of the fixture (f) is uniformly modified and sterilized in a short period of time (about 3 to 10 minutes) by high-energy ultraviolet rays, periodontal tissue and The stability can be further improved.

Here, the ampoule parts (50, 250) are made of quartz to improve the transmittance of ultraviolet rays, and the outside of both ends closed by the stopper are sealed by the heat-shrinkable vinyl cover to maintain a sealed state substantially similar to a vacuum pressure state. It can be provided. Therefore, even if vacuum ultraviolet rays in the UV-C range continuously pass through the container and the ultraviolet projection window, energy attenuation is minimized, and thus the irradiation efficiency of ultraviolet rays can be further improved.

At this time, terms such as “include,” “comprise,” or “equipped” described above mean that the corresponding component may be present, unless specifically stated to the contrary, excluding other components. It should be interpreted as being able to include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

As described above, the present invention is not limited to the above-described embodiments, and modifications and implementations can be made by those skilled in the art without departing from the scope of the claims of the present invention. And such modifications fall within the scope of the present invention.

10,210: Case 20,220: Ultraviolet light source unit
30,230: Blowing fan 40,240: Cover part
50,250: Ampoule part f: Fixture
100,200: Ultraviolet irradiation device for surface treatment of implants

Claims (5)

A case having an inlet through which air flows in is formed along the side wall and the upper part is open;
An ultraviolet light source unit disposed inside the case to surround a modification space in which the implant surface modification object is accommodated; and
It includes a blowing fan that blows air introduced into the inlet to dissipate heat from the ultraviolet light source,
The ultraviolet light source unit includes a plurality of LED lamps arranged along the circumferential direction to surround the modification space and emitting ultraviolet wavelengths for surface modification of the implant surface modification object, and a plurality of ultraviolet light sources disposed outside the LED lamp and connected to the case. It includes a heat dissipation plate portion provided with two heat dissipation fins,
Each of the heat dissipating fins is provided radially at a predetermined distance between the case and the ultraviolet light source unit and extends in the vertical direction of the case, and one side of each heat dissipating fin is connected to one of the plurality of ultraviolet light source parts, and the other side is connected to one of the plurality of ultraviolet light source parts. An ultraviolet irradiation device for surface treatment of implants, characterized in that it is connected to the inner wall of the case. According to claim 1,
The implant surface modification object includes an implant whose surface is modified by irradiation of ultraviolet rays, and an ampoule portion including an ultraviolet ray projection window that is hollow so that the implant is accommodated therein and is made of a material that transmits ultraviolet rays,
The implant surface modification object is inserted and disposed in the modification space in the longitudinal direction of the implant, and is arranged to be surrounded by the ultraviolet light source along the circumferential direction. delete According to claim 1,
a cover portion that selectively covers the upper part of the case,
An ultraviolet irradiation device for surface treatment of an implant, further comprising a control unit that controls the operation of the blowing fan and the ultraviolet light source unit. According to claim 4,
A discharge portion through which air is discharged is formed in the cover portion,
The blowing fan is an ultraviolet irradiation device for surface treatment of an implant, characterized in that the blowing fan is disposed inside the cover portion to discharge air introduced into the inlet toward the discharge portion.

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