KR20170109964A - A light treatment apparatus - Google Patents

Abstract

The present invention relates to a phototherapy apparatus, which comprises a light source for generating therapeutic light to be irradiated to a treatment position, a light-transmissive material which is in contact with the treatment position during treatment and at least part of which is passed through the treatment position, A first cooling element arranged to be spaced apart from a rear side of the contact portion and configured to cool the contact portion, and a second cooling element configured to cool the contact portion when the first cooling element is driven, And a heat transfer portion for thermally connecting the contact portion. According to the present invention, there is an advantage that the cooling performance can be improved by constituting the contact type cooling mechanism by using at least two cooling elements.

Description

[0001] The present invention relates to a light treatment apparatus,

The present invention relates to a phototherapy apparatus, and more particularly, to a phototherapy apparatus that irradiates light while cooling a treatment position to perform treatment.

A technique of treating a tissue by modifying the state of tissue or removing it by transferring energy to various target positions of a patient by using electromagnetic waves or the like is widely applied. In this therapeutic field, it is used as various energy sources such as visible light, RF radio frequency wave, microwave and ultrasound.

The dual phototherapy device uses energy to transfer energy to the target area to be treated. For example, when a therapeutic light is irradiated to the skin using a phototherapy device, light having a specific wavelength penetrates into the skin, and is absorbed into various tissues such as collagen, hair follicle, hemoglobin, do. The absorbed light is converted into heat energy in the tissue, which changes the state of the tissue in such a way as to cause thermal damage to the tissue or to activate a specific substance. Such a phototherapy apparatus is also disclosed in Korean Patent Laid-Open Publication No. 10-2012-0127564.

When light is irradiated to a target position using such a phototherapy apparatus, thermal damage may occur even to tissues other than the target position due to energy transmitted by the light. For example, when light is irradiated to the subcutaneous tissue located on the inner side of the skin, thermal damage may occur to the skin surface at the corresponding position. Therefore, when the treatment is performed using the phototherapy apparatus, it is common to cool the surface of the target site before or during the treatment. For example, a method of cooling by bringing a thermally conductive member that maintains a low temperature into contact with a coolant or a thermoelectric element or cooling it by spraying a cryogenic gas at a very low temperature, or the like is mainly used.

However, in the method of injecting the cryogenic cooling gas, it is difficult to construct the optical therapy apparatus compactly because the cooling gas storage unit and the injection unit must be separately provided. Further, there is a disadvantage in that the method of cooling by bringing the thermally conductive member into contact is difficult to miniaturize the contact portion or the cooling efficiency is low.

Korean Patent Publication No. 10-2012-0127564

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a phototherapy apparatus capable of maintaining excellent cooling performance while a contact portion of a phototherapy apparatus is constituted by a compact structure.

In order to achieve the above-mentioned object, the present invention provides a light source for generating therapeutic light to be irradiated to a treatment position, a light source for irradiating the treatment light, A first cooling element arranged to be spaced apart from a rear side of the contact portion and configured to cool the contact portion, and a second cooling element configured to cool the contact portion when the first cooling element is driven, And a heat transfer portion for thermally connecting the contact portion with the heat transfer portion.

The phototherapy apparatus may further include a second cooling element provided at a position adjacent to the contact portion to cool the contact portion. Here, the first cooling element and the second cooling element may each be constituted by a thermoelectric element including a cooling part and a heating part.

The heat transfer part may include a heat pipe including a volatile fluid therein, and may be configured to thermally connect the cooling part of the first cooling element and the contact part. Furthermore, one end of the heat transfer part may be connected to the cooling part of the first cooling element, and the other end of the heat transfer part may be configured to be connected to the heating part of the second cooling element and the rest to the contact part.

Here, the contact portion may include a window made of a light-transmitting material through which the treatment light passes, forming a portion in contact with the treatment position, and a tip mount for fixing the window, the window being made of a thermally conductive material, The heat transfer unit or the second cooling element may be installed in contact with the tip mount.

Specifically, the tip mount includes a body portion having an opening in which the window is disposed, and a coupling portion provided at one side of the body portion and having a contact surface for contacting the heat transfer portion or the second cooling element, .

The coupling portion is configured to extend from one side of the body portion toward the light source so as to widen a surface contacting the heat transfer portion or the second cooling element, and a recess for seating the second cooling element is formed . The depth of the recess may be shallower than the thickness of the second cooling element.

Further, the tip mount may be configured to include at least one hole so that a sensor for sensing the temperature of the treatment position or for detecting whether or not the treatment position is contacted is disposed.

The phototherapy apparatus further includes a housing which forms an outer appearance and in which the light source is disposed and the contact portion is provided at an end portion to which the light is irradiated, May be configured to be narrower than the cross section of the installed position.

Here, the second cooling element is installed to be disposed at a position closer to the treatment position during treatment than the first cooling element, and the second cooling element is installed so as to be compactly installed at a position adjacent to the contact portion And may be configured to have a smaller size than the first cooling element.

The first cooling element and the second cooling element are each composed of a thermoelectric element including a cooling part and a heat generating part, the heat transfer part thermally connecting the cooling part of the first cooling element and the contact part, The heat generating portion of the first cooling element may be configured to be cooled by a separate cooling passage.

The cooling passage for cooling the heat generating portion of the first cooling element may be configured to cool the heat generated in the light source through a position adjacent to the light source. Further, it is possible to further include a third cooling element for cooling the refrigerant circulating through the cooling passage.

It is another object of the present invention to provide a light source that is installed inside the housing and generates therapeutic light to be irradiated to a treatment position, a light source provided at an end of the housing where the therapeutic light is irradiated, Permeable material and a contact portion in contact with the treatment position so that at least part of the treatment light can pass therethrough and be irradiated to the treatment position, and the contact portion is connected to the thermoelectric element and the thermoelectric element And a cooling section that is configured to include a heat transfer section for performing heat treatment.

According to the present invention, there is an advantage that the cooling performance can be improved by constituting the contact type cooling mechanism by using at least two cooling elements.

Further, according to the present invention, two cooling elements are connected by using a heat transfer part, and the cooling device and the light source are simultaneously radiated by using one cooling flow path, so that the optical therapy device can be configured compactly There are advantages.

1 is a perspective view of a phototherapy apparatus according to an embodiment of the present invention,
Fig. 2 is a sectional view showing the internal structure of the handpiece of Fig. 1,
Fig. 3 is a perspective view showing the tip mount structure of Fig. 1,
Fig. 4 is a view schematically showing the path of the cooling passage in Fig. 2,
5 is a cross-sectional view illustrating an internal structure of a handpiece according to another exemplary embodiment of the present invention.

Hereinafter, a phototherapy apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the positional relationship of each component is principally described based on the drawings. The drawings may be simplified or exaggerated for ease of explanation. It is to be understood that the following description and drawings are for the purpose of describing the technical concept of the present invention and that the present invention is not limited thereto and various devices may be added, changed or omitted.

1 is a perspective view of a phototherapy apparatus according to an embodiment of the present invention. The phototherapy apparatus 1 of the present embodiment is an apparatus for treating various lesions using the skin as a treatment position and can be used for various treatments such as wrinkle improvement, pigmentation improvement, scar removal, hair removal, hair growth, have. However, it should be noted that the present invention is not limited to such a phototherapy apparatus, and can be widely applied to an apparatus for proceeding phototherapy while cooling a treatment position (wherein the treatment position is a state in which the treatment light passes Which may mean the surface position of the human tissue). 1, a phototherapy apparatus 1 according to the present invention comprises a main body 10, a handpiece 30, and a connection unit 20. As shown in FIG.

The main body 10 constitutes a main appearance of the phototherapy apparatus. The main body 10 may be provided on the outer surface thereof with a control panel 11 for manipulating the contents of the treatment and a display 12 for displaying the status of the treatment. Inside the main body 10, a power supply unit (not shown) for driving the phototherapy apparatus and various control apparatuses (not shown) for controlling the phototherapy apparatus may be provided.

The connection unit 20 is configured to connect the main body 10 and the handpiece 30. The connection unit 20 may be formed in a flexible form so that the position of the handpiece 30 can be adjusted by a practitioner, or in a link form. Various power lines (not shown) or signal lines (not shown) for transmitting power or control signals from the main body 10 to the handpiece 30 may be provided in the connection unit 20.

The handpiece 30 is movable from a state held by a practitioner to a treatment position, and irradiates treatment light to a treatment position. As shown in FIG. 1, one side of the handpiece 30 is connected to the main body 10 by a connecting unit 20. The other side of the handpiece 30 forms a light irradiating part 32 to which the therapeutic light is irradiated. Therefore, the treatment light is irradiated while the light irradiation part is positioned at the treatment position to proceed the treatment.

The handpiece 30 includes a housing 31 forming an outer appearance and various components installed inside the housing. The housing 31 is formed in a size capable of being held by a practitioner, and an operation button 33 for controlling the operation of the handpiece during treatment by a practitioner may be provided on the outer surface of the housing. Various components for generating treatment light and cooling the treatment position are disposed inside the housing 31, which will be described with reference to FIG.

Fig. 2 is a sectional view showing the internal structure of the handpiece of Fig. 1. Fig. In the interior of the handpiece 30, a light source 110 for generating therapeutic light, a light guide 120 for forming a path through which the therapeutic light travels, a contact portion for contacting the treatment position and forming a portion to which the therapeutic light is externally irradiated (130) and a contact cooling portion (200) for cooling the contact portion.

The light source 110 is a module for generating treatment light, and in this embodiment, it is formed of a module for generating a laser as treatment light. Specifically, the light source 110 may be composed of a laser diode array including a plurality of laser diodes and a module packaged with a heat sink. 2, the light source 110 is provided inside the handpiece 30, but the present invention is not limited thereto. In addition, it is also possible that the light source is provided in the main body so that the therapeutic light is transmitted to the handpiece through the optical fiber, or it is possible to use other light than the laser as the therapeutic light.

The light guide 120 is disposed in front of the light source 110 to form a light path through which the treatment light advances (hereinafter, for convenience of explanation, And the direction opposite to the traveling direction of the therapeutic light is set to the rear). The light guide 120 may include an optical element through which light can pass, and may have a shape in which a cross section is narrowed toward the contact portion 130 from the light source 110.

The contact portion 130 is disposed in front of the light guide 120 and constitutes a light irradiation portion 32 in which light is emitted to the outside from the handpiece 30 (see FIG. 1). Therapeutic light generated in the light source 110 passes through the light guide 120 and the contact portion 130 and is irradiated to the treatment position. Therefore, a part of the contact portion 130 is made of a light-transmitting material through which the therapeutic light can pass.

In addition, contact portion 130 forms a portion in contact with the treatment location of the patient during treatment. The contact portion 130 is made of a material having a high thermal conductivity in whole or in part, and can be configured to be selectively cooled by the contact cooling portion 200. Accordingly, the contact portion 130 can cool the treatment position that is contacted during the treatment, thereby preventing the treatment position from being overheated and damaged by the treatment light.

Specifically, the contact portion 130 includes a window 140 and a tip mount 150 on which a window is installed.

The window 140 is disposed on a path along which the therapeutic light irradiated from the light source 110 travels, and corresponds to a portion where the therapeutic light passes and is emitted to the outside. Accordingly, the window 140 is made of a transparent material having excellent light transmittance. The front surface of the window is formed so as to form or protrude in the same plane as the front surface of the housing or tip mount so that the window 140 can contact the treatment position during treatment. The window 140 is made of a material having a high thermal conductivity, so that the above-described contact cooling portion 200 cools while the tip mount 150 is cooled to cool the contacted treatment position. In this embodiment, a window is formed by using a sapphire-made element having a rectangular shape, but various other structures can be changed.

The tip mount 150 is a structure for fixing the window and can be cooled by the contact cooling unit 200. Accordingly, the tip mount 150 is made of a material such as copper, aluminum, etc., which is solid and has excellent thermal conductivity. The tip mount 150 includes a body portion 160 on which a window is installed and an engaging portion 170 that is thermally coupled to the contact cooling portion.

The body portion 160 of the tip mount is configured to include an opening 162 in which the window 140 is disposed. In this embodiment, the body portion 160 has a frame 161 of a rectangular shape corresponding to the shape of the above-described window, and an opening 162 of a rectangular structure is provided therein. A stepped structure is formed inside the frame, whereby the window can be seated and fixed. In this embodiment, the opening of the body portion is defined by a closed loop boundary (frame) (see FIG. 3), but the opening may be configured to have an open boundary.

Further, the body part 160 may further include a fastening structure (not shown) so as to be fixedly installed in a housing of the handpiece 30 or a separate bracket structure. The body portion 160 may further include at least one hole 163 through which the sensor module 40 is installed. Here, the sensor module 40 may be a contact sensor that detects whether or not the contact portion has contacted the treatment position, and may be a temperature sensor that measures the temperature of the treatment position.

On the other hand, a coupling portion 170 is formed on one side of the tip mount 150. The joining portion constitutes a portion to be thermally coupled to a contact cooling portion to be described later and is configured to be cooled to the body portion 160 and the window 140 disposed in the body portion when the joining portion 170 is cooled. The structure of this coupling portion will be described in more detail below.

The contact cooling unit 200 is provided at one side of the tip mount 150 and cools the contact unit 130 to cool the treatment position in contact with the contact portion during treatment. This makes it possible to prevent the treatment position from being damaged by heat during treatment. Such a contact cooling part can be constructed using various cooling methods.

For example, the cooling passage may be formed at a portion adjacent to the contact portion 130, and the refrigerant may be circulated through the cooling passage to cool the contact portion. However, such a water-cooled structure has a drawback that the cooling efficiency is relatively low and the cooling passage passing through the contact portion must be formed, so that the light irradiation portion can not be constructed compactly.

It is also possible to provide a thermoelectric element at a position adjacent to the contact portion 130 to cool the contact portion with the thermoelectric element. In this case, the size of the thermoelectric element is inevitably increased in order to improve the cooling performance at the treatment position. Therefore, there is a limitation in improving the cooling performance without modifying the design of the light irradiating portion.

Accordingly, the contact cooling unit 200 of this embodiment includes the cooling device 210 and the heat transfer unit 220. The cooling element 210 performing the main cooling function may be disposed at a position spaced apart from the contact portion 130 and the cooling element 210 and the contact portion 130 may be thermally connected using the heat transfer portion 220 have.

Generally, the light irradiating portion 32 (i.e., the contact portion) of the handpiece needs to minimize the size of the component except for the window where the therapeutic light is irradiated, so that it is easy to treat while confirming the treatment position. Therefore, there is a limit in securing a space for the cooling function in the contact portion. In contrast, the central portion (or the rear portion) of the handpiece on which the light source 110 is installed may have a structure having a relatively wide cross section (cross section having a vertical direction to the optical path) as compared with the light irradiation portion, Since the constraint is less, it is also advantageous to secure a space for contact cooling. Accordingly, the contact cooling unit 200 of the present embodiment is configured to cool the contact unit 130 through the heat transfer unit 220 connected to the contact unit, . In this case, since it is possible to secure a sufficient space for the cooling element, the cooling performance can be improved by designing to arrange a cooling element of a large size when necessary.

Here, the cooling element 210 may be composed of a thermoelectric element having a cooling part 211 and a heat generating part 212, respectively. Such a thermoelectric element generates a temperature difference between the cooling part and the heating part due to the Peltier effect as electricity is applied, and cooling is performed using the cooling phenomenon of the cooling part.

Meanwhile, the heat transfer unit 220 may be a heat pipe having a long shape. The heat pipe has a structure in which a porous structure is formed inside the body and a volatile liquid is accommodated therein, and the heat conduction characteristics are superior to those of a general metal. One end of the heat transfer 220 is coupled to the cooling part of the primary cooling element 210 and the other end is coupled to the contact part 130 to cool the contact part 130. As described above, by connecting a cooling element and a contact portion which are spaced apart from each other using a heat pipe having excellent thermal conductivity, it is possible to significantly improve cooling efficiency and speed as compared with heat transfer using another metal material.

As described above, the phototherapy apparatus of the present invention can be configured so as not to have a separate cooling element in the contact portion but to be cooled by the heat transfer portion (see FIG. 5). However, the present embodiment may further include an auxiliary cooling element 230 that is in contact with the contact portion 130. The auxiliary cooling element 230 may be formed in a small size that does not affect the structure of the light irradiation portion using the structure of the tip mount 150 of the contact portion 130.

When the heat transfer part 220 is coupled to the contact part and the auxiliary cooling element 230 is separately provided, the contact part 130 is cooled by the main cooling element 210 and the auxiliary cooling element 230, The cooling performance can be improved.

When one end of the heat transfer part 220 is coupled to the heat generating part 232 of the auxiliary cooling element 230, the temperature of the cooling part of the auxiliary cooling element 230 is lowered, Can be improved.

Accordingly, when a part of the heat transfer part 220 is coupled to the heat generating part of the auxiliary cooling element and the remainder is coupled to the contact part, there is an advantage that both of the above-mentioned two effects can be seen. Also, as shown in FIG. 5, there is an advantage that the cooling function can be performed at a faster reaction speed as compared with the structure in which no auxiliary cooling element is provided.

2, the contact cooling portion 200 includes a first cooling element 210 (the main cooling element described above), a heat transfer portion 220, and a second cooling element 230 , Auxiliary cooling element). A coupling portion 170 is formed on one side of the tip mount 150 of the contact portion. The coupling portion 170 is thermally coupled to the heat transfer portion 220 and the second cooling element 230 connected to the first cooling element. Therefore, the contact portion 130 and the treatment position can be cooled by the driving of the contact cooling portion 200. [

3, the coupling part 170 of the tip mount 150 is provided on one side of the body part 160 and forms a structure extending in the backward direction do. One surface of the engaging portion 170 forms a contact surface that is in thermal contact with the contact cooling portion 200, and the area of the contact surface contacting the contact cooling portion 200 is increased by this elongated structure.

Meanwhile, the coupling part 170 is provided with a recess 171 for installing the second cooling element 230 thereon. Here, the depth of the recess 171 is formed shallower than the thickness of the second cooling element 230 so that the heat generating part 232 of the second cooling element 230 can be configured not to be accommodated in the recess 171 have. The contact surface 172 on both sides where the recess 171 is not formed may form a portion where the end portion of the heat transfer portion 220 is contactably engaged.

The structure of the contact cooling unit 200 installed in the tip mount 150 is as follows. 2, the first cooling element 210 is spaced rearward from the contact part 130, and the cooling part 211 of the first cooling element 210 is connected to one end of the heat transfer part 220 . The heat transfer part 220 extends in the direction of the contact part 130 in a bent shape and a part of the heat transfer part 220 is thermally coupled to the coupling part 170 of the tip mount 150 to cool the contact part 130 .

The second cooling element 230 includes a thermoelectric element including a cooling part 231 and a heat generating part 232 like the first cooling element 210. The second cooling element 230 has a smaller size than the first cooling element 210 And can have a small capacity. In this second cooling element 230, the cooling part is received and engaged in the recess 171 of the coupling part 231. Accordingly, the second cooling element 230 may be configured to cool the contact portion 130 separately from the first cooling element 210. [ At this time, a part of the heat transfer part 220 is connected to the heat generating part 232 of the second cooling element 230 to cool the heat generating part, thereby further improving the cooling performance by the second cooling element 230 .

Here, the direction in which the engaging portion 170 of the tip mount 150 extends and the extending direction of the heat transfer portion 220 correspond to each other so that the structure of the contact portion corresponding to the light irradiating portion can be made more compact . The cable 233 connected from the second cooling element 230 may also be arranged in a direction corresponding to the extending direction of the heat transfer part 220.

As described above, since the light source 110 is formed using a laser diode array, the light source 110 may be further provided with a separate light source cooling unit 300 for cooling the heat generated from the light source 110. The light source cooling unit 300 may include a first cooling block 310 disposed at a position adjacent to the light source 110 and a cooling channel 340 passing through the first cooling block. Therefore, the refrigerant circulates along the cooling flow path 340 and can dissipate heat generated in the light source 110.

As the first cooling element 210 is also driven, the temperature of the heat generating part 212 rises, and cooling is required. Therefore, in this embodiment, the cooling passage 340 of the light source cooling unit 300 is used to cool the heat generating part 212 of the first cooling element 210. [

Fig. 4 is a view schematically showing the path of the cooling passage in Fig. 2. Fig. As shown in FIG. 4, the coolant circulates through the cooling passage 340 by the pump 350. At this time, the cooling passage 340 can dissipate heat generated in the light source while passing through the first cooling block 310 disposed at a position adjacent to the light source 110. The cooling passage 340 can dissipate heat generated in the first cooling element 210 while passing through the second cooling block 320 disposed at a position adjacent to the heating part 212 of the first cooling element . The cooling channel 340 is configured to be able to lower the temperature of the refrigerant in the cooling channel while passing through the third cooling block 330 disposed at a position adjacent to the cooling part 361 of the third cooling module 360 . Here, the third cooling element 360 is provided at the edge of the handpiece housing, and the heat generating part 362 of the third cooling element 360 is cooled and air-cooled using a structure of a cooling pin (not shown) .

As described above, the contact cooling unit 200 according to the present embodiment uses the first cooling element 210 spaced apart from the contact portion to cool the contact portion 130 using the heat pipe 220, The cooling efficiency can be improved while maintaining a compact structure of the heat exchanger 130. [ In addition, the second cooling element 230 is additionally provided on the contact portion 130 to add a separate cooling function to the first cooling element 210, and combined with the first cooling element to perform cooling at a lower temperature So that the contact cooling performance can be improved.

The light source cooling unit 300 of the present embodiment also uses a common cooling channel 340 to simultaneously heat the heat generated when the light source 110 is driven and the heat generated when the contact cooling unit 200 is driven So that a cooling channel can be formed more simply.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the present invention as defined by the appended claims. Leave.

110: light source 120: light guide
130: contact part 210: first cooling element
220: heat transferring part 230: second cooling element
340: cooling channel

Claims (15)

A light source for generating therapeutic light irradiated to the treatment position;
A contact portion that is in contact with the treatment position during treatment and at least part of which is made of a light transmitting material so that the treatment light can pass therethrough and be irradiated to the treatment position;
A first cooling element arranged to be spaced apart from a rear side of the contact portion and configured to cool the contact portion; And
And a heat transfer portion for thermally connecting the first cooling element and the contact portion so as to cool the contact portion when the first cooling element is driven. The method according to claim 1,
And a second cooling element provided at a position adjacent to the contact portion to cool the contact portion. 3. The method of claim 2,
Wherein the first cooling element and the second cooling element are each composed of a thermoelectric element including a cooling part and a heat generating part,
Wherein the heat transfer part comprises a heat pipe including a volatile fluid therein, and thermally connects the cooling part of the first cooling element and the contact part. The method of claim 3,
One end of the heat transfer portion is connected to a cooling part of the first cooling element,
Wherein a part of the other end of the heat transfer part is connected to a heating part of the second cooling element, and the other part is connected to the contact part. 3. The method of claim 2,
Wherein the contact portion comprises a window made of a light transmissive material through which the treatment light passes and a tip mount configured to fix the window, the window being made of a thermally conductive material,
Wherein the heat transfer portion or the second cooling element is installed in contact with the tip mount. The tip mount according to claim 5,
A body having an opening in which the window is disposed; And
And a coupling part provided at one side of the body part and having a contact surface for contacting the heat transfer part or the second cooling element. The method according to claim 6,
The coupling portion is configured to extend from one side of the body portion toward the light source so as to widen a surface contacting the heat transfer portion or the second cooling element, and a recess for seating the second cooling element is formed Wherein the light source is a light source. 8. The method of claim 7,
Wherein a depth of the recess is formed shallower than a thickness of the second cooling element. The method according to claim 6,
Wherein the tip mount comprises at least one hole so that a sensor is positioned to sense the temperature of the treatment position or to detect whether it is in contact with the treatment position. 3. The method of claim 2,
Further comprising a housing which forms an outer appearance and in which the light source is disposed and the contact portion is provided at an end portion to which the light is irradiated,
Wherein the housing has a cross section at a position where the contact portion is provided is narrower than a cross section at a position where the light source is installed. 11. The method of claim 10,
Wherein the second cooling element is installed to be disposed at a position closer to the treatment position during treatment than the first cooling element,
Wherein the second cooling element is configured to be smaller in size than the first cooling element so as to be compactly installed at a position adjacent to the contact portion. 11. The method of claim 10,
Wherein the first cooling element and the second cooling element are each composed of a thermoelectric element including a cooling part and a heat generating part,
Wherein the heat transfer part thermally connects the cooling part of the first cooling element and the contact part and the heating part of the first cooling element is cooled by a separate cooling flow path. 13. The method of claim 12,
Wherein the cooling passage for cooling the heat generating portion of the first cooling element passes through a position adjacent to the light source to cool the heat generated in the light source. 14. The method of claim 13,
And a third cooling element for cooling the refrigerant circulating through the cooling passage. housing;
A light source installed inside the housing to generate therapeutic light to be irradiated to the treatment position;
A contact portion provided at an end portion of the housing to which the treatment light is irradiated, the contact portion being made of a light transmitting material so as to be in contact with the treatment position during treatment and at least part of the treatment light can be irradiated to the treatment position; And
And a cooling part including a thermoelectric element arranged to be spaced apart from the contact part and configured to cool the contact part in contact with the treatment position and a heat transfer part for thermally connecting the cooling part of the thermoelectric element and the contact part, Device.

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