A kind of port wine stain treatment instrument and its operation method

Abstract

The present application discloses a port-wine stain treatment device and an operation method thereof, and relates to the technical field of cosmetic medical devices, a light source emitting unit, a treatment head and a host computer, wherein the light source emitting unit is used to selectively emit a first laser source of a first wavelength band and a second laser source of a second wavelength band, wherein the first laser source is used for photothermal therapy, and the second laser source is used for photodynamic therapy and distance measurement; the treatment head comprises a housing and a plastic lens disposed in the housing, wherein the plastic lens can move along the central axis of the plastic lens, and the plastic lens is used to receive the first laser source and project therapeutic light to the lesion tissue, or receive the second laser source and project therapeutic light spot or distance measurement light spot to the lesion tissue; the host computer comprises an image acquisition unit, a data processing unit and a controller, wherein the image acquisition unit receives the distance measurement light spot reflected by the lesion tissue and determines the area size of the distance measurement light spot, and when the area of ​​the distance measurement light spot is the smallest, the image acquisition unit feeds back the position of the plastic lens to the data processing unit; the data processing unit acquires the distance H between the light output end of the treatment head and the affected part according to the position of the plastic lens, and the controller can control the output optical power of the therapeutic light according to the distance H. The present application has the effect of improving the convenience of physicians in adjusting and operating the photodynamic therapy device.

Description

Technical Field

[0001] The present application relates to the technical field of cosmetic medical devices, and in particular to a port wine stain treatment device and an operating method thereof. Background Art

[0002] Port wine stains are usually a vascular lesion caused by the dilation of local blood vessels. Currently, there are two laser treatments for port wine stains: using the photothermal effect of laser on tissues and using the photodynamic effect of drugs.

[0003] The photothermal effect treatment uses pulsed dye laser. The emitted laser can be absorbed by the hemoglobin in the blood vessels to the maximum extent, causing the blood vessels to shrink and collapse. However, the photothermal effect treatment of port-wine stains has high requirements on the blood vessel conditions. Only blood vessels of appropriate thickness can achieve the ideal treatment effect.

[0004] Photodynamic therapy involves injecting photosensitizers into the diseased tissues. After a specific period of time, the diseased tissues are irradiated with lasers. The photosensitizers produce photochemical reactions, and cytotoxic free radicals kill vascular endothelial cells, causing the abnormal blood vessels to be destroyed and then causing the color to change. Photodynamic therapy combines the advantages of high selectivity, low trauma, safety, repeatable treatment, and no drug resistance, but the price of photodynamic therapy is more expensive than photothermal therapy.

[0005] Whether it is the photothermal effect or the photodynamic effect, the optical power density determines the outcome of laser treatment, which is achieved by adjusting the treatment spot size and the output optical power. Before treatment, the physician needs to determine the optical power density requirements based on the patient's condition, and then manually adjust the distance between the treatment head and the lesion tissue to adjust the treatment spot size and optical power density, which is cumbersome to implement and the adjustment accuracy is not fine enough. Summary of the invention

[0006] In order to improve the problem that doctors have to use a port-wine stain treatment device that is cumbersome and inconvenient to adjust, the present application provides a port-wine stain treatment device and an operating method thereof.

[0007] In the first aspect, the present application provides a port wine stain treatment device, which adopts the following technical solution:

[0008] A port wine stain treatment device, comprising:

[0009] A light source emitting unit, used for selectively emitting a first laser source of a first wavelength band and a second laser source of a second wavelength band, wherein the first laser source is used for photothermal therapy, and the second laser source is used for photodynamic therapy and distance measurement;

[0010] A treatment head, comprising a shell and a shaping lens disposed in the shell, wherein the shaping lens can move along its central axis and is used to receive lasers of different wavelength bands and project a treatment spot or a distance-measuring spot to the diseased tissue; and

[0011] The host computer includes an image acquisition unit, a data processing unit and a controller, wherein the controller is electrically connected to the data processing unit and the light source emitting unit, the image acquisition unit receives the ranging light spot reflected by the diseased tissue and determines the size of the ranging light spot, and when the ranging light spot area is the smallest, the image acquisition unit feeds back the position of the plastic lens to the data processing unit;

[0012] The data processing unit obtains the distance H between the light output end of the treatment head and the affected part according to the position of the plastic lens, and the controller can adjust the output light power of the treatment spot according to the distance H.

[0013] By adopting the above technical solution, the therapeutic device realizes the emission of laser through the first laser source or the second laser source, and the laser emitted by the first laser source or the second laser source is irradiated to the surface of the diseased tissue through the treatment head, so that the therapeutic device of the present application has the dual functions of distance measurement and treatment;

[0014] The second laser source emits laser to form a ranging spot on the surface of the diseased tissue. The ranging spot is received by the image acquisition unit after being reflected by the diseased tissue, and the position of the plastic lens is continuously moved until the image acquisition unit determines that the minimum ranging spot is obtained. At this time, the image acquisition unit feeds back the position of the plastic lens to the data processing unit, and then calculates the distance H through the position of the plastic lens. The distance H can be used to determine the size of the treatment spot formed on the surface of the diseased tissue after the therapeutic laser is emitted from the light source emitting part and passes through the plastic lens. The optical power density is equal to the ratio between the output optical power and the treatment spot area. The output optical power is thus calculated based on the physician's ideal treatment optical power density and the treatment spot area, and the output optical power is controlled by the controller.

[0015] Optionally, a motion guide rail and a driving source are also provided in the shell, the shaping lens is connected to the motion guide rail, the driving source is electrically connected to the central processing module, and the driving source drives the shaping lens to slide along the motion guide rail to achieve shaping of the laser.

[0016] By adopting the above technical solution, when the measuring light spot is formed by the laser emitted by the second laser source, the shaping lens can be moved along the moving guide rail to form measuring light spots of different sizes, so that the image acquisition unit acquires measuring light spots of different sizes and identifies the position of the moving shaping lens on the moving guide rail when the minimum measuring light spot is formed;

[0017] When the treatment spot is formed by using the laser emitted by the first laser source, the area of ​​the treatment spot can be adjusted by moving the shaping lens along the motion guide rail;

[0018] When the laser light emitted by the second laser source is used to form a treatment spot, the position of the shaping lens is moved so that the laser light passes through the shaping lens to form a parallel laser beam, thereby satisfying the conditions for forming the treatment spot.

[0019] Optionally, a light uniformity structure is further configured at the light outlet of the treatment head, and the light uniformity structure is detachably connected to the shell, or the light uniformity structure is rotatably connected to the shell;

[0020] When the first laser source is working, the light homogenizing structure avoids the laser beam, and when the second laser source is working, the light homogenizing structure is located in the light emitting direction of the shaping lens.

[0021] By adopting the above technical solution, when the laser emitted by the second laser source is used to form a therapeutic spot, a uniform therapeutic spot is formed by using the light homogenizing structure, which can achieve a better therapeutic effect; the premise for the laser to form a uniform therapeutic spot through the light homogenizing structure is that the laser irradiated to the light homogenizing structure is parallel light, so by adjusting the position of the shaping lens, the laser emitted by the second laser source forms parallel light after passing through the shaping lens, and then passes through the light homogenizing structure to finally form a uniform therapeutic spot, thereby realizing photodynamic therapy of the diseased tissue.

[0022] Optionally, the light source emitting part is arranged separately from the treatment head;

[0023] The port wine stain treatment device also includes a fiber optic connector, which is connected to the housing. The first laser source and the second laser source included in the light source emitting part both output light beams to the fiber optic connector through optical fibers.

[0024] By adopting the above technical solution, the light source emitting part and the treatment head are separated, so that the doctor can treat the diseased tissue in different parts only by moving the treatment head. The movement is more convenient and efficient, and at the same time, the stable emission of the first laser source and the second laser source can be achieved.

[0025] Optionally, the image acquisition unit includes a photoelectric CCD detector arranged at the light output end of the treatment head, and the light receiving end of the photoelectric CCD detector is provided with a filter and an attenuation plate.

[0026] By adopting the above technical solution, the filter is used to reduce the influence of stray light of other wavelengths on the image acquisition unit receiving the ranging light spot; the attenuation plate is used to reduce the energy of the reflected light reflected back to the image acquisition unit by the diseased tissue, so that the photoelectric CCD detector can work normally and reduce the occurrence of threshold saturation.

[0027] Optionally, the wavelength of the first band is between 585-595 nm, the wavelength of the second band is 510 nm, and the output optical power of the second laser source when used for ranging is lower than 5 mW.

[0028] By adopting the above technical solution, the first laser achieves treatment through photothermal effect. When the wavelength of the first band is in the range of 585-595nm, the treatment effect is better. The second laser achieves treatment through photodynamic effect. When the wavelength of the second band is 510nm, the photodynamic treatment effect is better. When the light power of the second laser source is lower than 5mW, it is used to form a ranging spot.

[0029] In a second aspect, the present application provides an operating method of a port wine stain treatment device, comprising the following operating steps:

[0030] S1: The second laser source emits laser, which is focused by the shaping lens to form a ranging spot on the tissue surface;

[0031] S2: The image acquisition unit receives the ranging light spot and moves the shaping lens until the smallest ranging light spot is formed on the surface of the lesion tissue; S3: Calculate the distance H between the end face of the treatment probe and the lesion tissue;

[0032] S4: The treatment spot area is calculated according to the distance H, and the physician inputs the ideal treatment power density to obtain the output light power of the first laser source or the second laser source.

[0033] According to the above operation method, first move the position of the shaping lens until the smallest ranging spot is formed. After the smallest ranging spot is formed, it means that the focusing point of the shaping lens is unique. At this time, the distance H between the end face of the treatment head and the lesion tissue can be measured by the position of the shaping lens.

[0034] Then, through the distance H and the structural parameters of the shaping lens, the area of ​​the treatment spot formed on the surface of the diseased tissue can be calculated, and the output light power of the laser can be calculated through the treatment spot area and the physician's ideal treatment power density; since the shaping lens used for distance measurement and the shaping lens used for forming the treatment spot have the same structure, the distance detection accuracy is relatively high, which can facilitate the physician to adjust the treatment power more accurately and improve the treatment accuracy of the therapeutic device.

[0035] Optionally, after the output optical power is adjusted in step S4, the first laser source or the second laser source emits laser light to achieve treatment of the diseased tissue;

[0036] If the second laser source is selected to emit laser for treatment, the shaping lens is moved until the laser forms collimated parallel light after passing through the shaping lens, and the homogenizing structure is moved so that the laser passes through the homogenizing structure and irradiates the surface of the diseased tissue.

[0037] By adopting the above technical solution, when the photodynamic effect is used to treat diseased tissue, the laser needs to pass through the light-homogenizing structure to form a uniform treatment spot to achieve a better treatment effect. The premise for the laser to pass through the light-homogenizing structure is that the laser incident on the light-homogenizing structure is parallel collimated light. Therefore, by moving the position of the plastic lens, the laser can be collimated, so that the plastic lens has multiple functions for realizing the formation of treatment spots for different treatment schemes.

[0038] Optionally, after forming the ranging light spot, the method further includes:

[0039] After being reflected by the diseased tissue, the ranging light spot is received by the image acquisition unit and processed to form a ranging light spot size map;

[0040] Moving the shaping lens along the motion guide rail until the image acquisition unit receives the minimum reflected light spot;

[0041] The central processing module determines the calculation parameters and realizes the calculation of the distance H according to the position of the moving guide rail where the shaping lens is located when the image acquisition unit receives the minimum reflected light spot.

[0042] By adopting the above technical solution, the mobile shaping lens can form ranging light spots of different sizes, and the image acquisition unit can acquire the ranging light spots reflected by the diseased tissue in real time.

[0043] Optionally, calculating the distance H specifically includes:

[0044] The straight-line distance between the laser emission point in the housing and the first end face of the moving guide is set to L1, the distance between the first end face of the moving guide and the center line of the shaping lens is set to L2, and the straight-line distance between the shaping lens and the end face of the treatment head is set to L3, and the values ​​of L1 and L2+L3 are constant;

[0045] The functional relationship between the distance H and L2 can be obtained according to the shaping lens parameters and the object-image distance formula.

[0046] By adopting the above technical solution and according to the above calculation method, the distance H between the treatment head and the diseased tissue can be realized by the position of the plastic surgery lens.

[0047] In summary, the present application includes at least one of the following beneficial effects:

[0048] 1. The present application is provided with a light source emitting unit including a first laser source and a second laser source, so that the therapeutic apparatus of the present application can not only realize the distance measurement between the treatment head and the lesion tissue, but also realize the photothermal treatment or photodynamic treatment of the port wine stain by using the therapeutic apparatus of the present application, so that the therapeutic apparatus of the present application has multifunctionality and improves the treatment efficiency of the therapeutic apparatus; at the same time, through the accurate distance measurement between the treatment head and the lesion tissue, the treatment power density can be more accurately controlled to achieve better treatment effect;

[0049] 2. This application only sets one shaping lens in the treatment head, that is, the treatment spot required by different treatment plans can be formed through the shaping lens, so that the treatment device can use different treatment methods to achieve the treatment of port wine stains;

[0050] 3. An image acquisition unit is set up so that when a minimum ranging spot is formed on the surface of the diseased tissue, the image acquisition unit can determine the size of the ranging spot area and feedback the position of the shaping lens on the moving guide rail to the data processing unit, thereby being able to more accurately measure the distance between the end face of the treatment head and the diseased tissue, so as to achieve more accurate output light power adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application using photothermal effect to achieve treatment;

[0052] Figure 2 This is a schematic diagram of the structure of an embodiment of the present application using photodynamic effect to achieve treatment;

[0053] Figure 3 is a schematic diagram of the principle of measuring the distance H in an embodiment of the present application;

[0054] Figure 4 It is a schematic diagram of the principle of measuring the treatment spot area S in the embodiment of the present application.

[0055] Explanation of the reference numerals: 1. light source emitting part; 11. first laser source; 12. second laser source; 2. treatment head; 21. housing; 22. shaping lens; 23. motion guide rail; 24. light homogenizing structure; 3. photoelectric CCD detector; 4. optical fiber connector. DETAILED DESCRIPTION

[0056] The present invention discloses a port wine stain treatment device, referring to Figure 1 , including a light source emitting part 1, a treatment head 2 and a host computer.

[0057] The treatment head 2 includes a shell 21 and a shaping lens 22. The shaping lens 22 is disposed in the shell 21 and can move along its central axis.

[0058] The light source emitting unit 1 can selectively emit a first laser source 11 of a first wavelength band and a second laser source 12 of a second wavelength band. The first laser source 11 is used to achieve photothermal therapy, and the second laser source 12 is used to achieve photodynamic therapy or distance measurement.

[0059] The host computer includes an image acquisition unit, a data processing unit and a controller. The controller is electrically connected to the data processing unit and the light source emitting unit 1. When the second laser source 12 emits a laser and forms a ranging light spot on the surface of the diseased tissue, the image acquisition unit is used to receive the ranging light spot reflected by the diseased tissue. Continuously moving the position of the shaping lens 22 can form ranging light spots of different sizes on the surface of the diseased tissue. The image acquisition unit determines the size of the received ranging light spot until the image acquisition unit receives the smallest ranging light spot. At this time, the image acquisition unit feeds back the position of the shaping lens 22 to the data processing unit.

[0060] The data processing unit calculates the distance H between the light-emitting end face of the treatment head 2 and the surface of the diseased tissue according to the position of the plastic lens 22 and the structural parameters of the plastic lens 22, and can calculate the area of ​​the treatment spot formed on the surface of the diseased tissue after the therapeutic laser passes through the plastic lens 22 according to the distance H.

[0061] Specifically, the physician determines the optimal therapeutic light power density based on the patient's injury. Since the light power density is equal to the ratio of the output light power to the therapeutic spot area, the physician can calculate the output light power based on the preset therapeutic light power density and the therapeutic spot area calculated by the data processing unit, and input the output light power through the controller to adjust the output light power.

[0062] The therapeutic device of the present application can not only realize automatic measurement of the treatment spot area, but also realize diseased tissue treatment through photothermal effect, and also realize diseased tissue treatment through photodynamic effect, so that the therapeutic device of the present application can adopt different treatment methods for port-wine stains.

[0063] The second laser source 12 is used as a photodynamic therapy light source and a ranging light source at the same time. At the same time, the first laser source 11 also reaches the surface of the diseased tissue through the plastic lens 22, so that the optical transmission paths of the ranging light source and the two treatment light sources are the same, thereby improving the accuracy of the treatment device's ranging, and then improving the accuracy of the treatment device's optical power density, thereby improving the treatment effect from the treatment device side.

[0064] When the shaping lens 22 moves to form the minimum ranging spot on the surface of the diseased tissue, it means that after the shaping lens 22 converges the laser light emitted by the second laser source 12, only one focusing point is formed, that is, the focusing effect is better, and the distance H measured at this time is more accurate.

[0065] Further, see Figure 1and Figure 2 A motion guide rail 23 and a driving source are also provided in the shell 21. The shaping lens 22 is slidably set on the motion guide rail 23, and the extension direction of the motion guide rail 23 is parallel to the central axis direction of the shaping lens 22. The driving source is used to drive the shaping lens 22 to slide along the motion guide rail 23, so as to realize the shaping effect of the shaping lens 22 on the laser propagation path emitted by the first laser source 11 or the second laser source 12.

[0066] Furthermore, the driving source may specifically be a servo motor and a lead screw, and the shaping lens 22 is mounted and connected to the lead screw, and the servo motor drives the lead screw to rotate to realize the movement of the shaping lens 22 along the motion guide rail 23. The smaller the pitch of the lead screw, the higher the zoom accuracy of the shaping lens 22 for the laser. According to the lead screw provided by the prior art, the measurement distance between the treatment head 2 and the lesion tissue can be controlled within a variation of 1 mm.

[0067] Further, see Figure 2 The light output end of the treatment head 2 is also provided with a light homogenizing structure 24, which can be a light homogenizing diverging sheet. The light homogenizing structure 24 can be detachably mounted on the light output end of the treatment head 2 or rotatably mounted on the light output end of the treatment head 2. When the first laser source 11 emits a laser, the light homogenizing structure 24 moves and avoids the laser beam; when the second laser source 12 works as a treatment laser, the light homogenizing structure 24 is located in the light output direction of the shaping lens 22. When the second laser source 12 is used to implement photodynamic therapy, the shaping lens 22 needs to be moved first, so that the laser forms a parallel laser beam after passing through the shaping lens 22, and the parallel laser beam forms a uniform photodynamic therapy spot after passing through the light homogenizing structure 24, which is irradiated to the surface of the diseased tissue to achieve the treatment of port wine stains.

[0068] Furthermore, the image acquisition unit may include a photoelectric CCD detector 3 and an image processor. The photoelectric CCD detector 3 is fixed in the shell 21 and arranged close to the light emitting end of the shell 21. The port for receiving light of the photoelectric CCD detector 3 is coplanar with the light emitting end of the shell 21.

[0069] When the first laser source 11 is used as a ranging laser, the first laser source 11 forms a ranging spot on the surface of the diseased tissue after passing through the shaping lens 22. The ranging spot is reflected or scattered by the diseased tissue and received by the photoelectric CCD detector 3, and is converted into an electrical signal by the photoelectric CCD detector 3 and transmitted to the image processor. The ranging spot size map is obtained through calculation by the image processor program. Since the program for the image processor to obtain the ranging spot size map is a prior art, it will not be described in detail here.

[0070] By continuously adjusting the position of the shaping lens 22 until a ranging light spot with the smallest area is formed on the surface of the diseased tissue, the image acquisition unit then feeds back a signal to the data processing unit, which can calculate the distance H between the end face of the treatment head 2 and the surface of the diseased tissue based on the position of the shaping lens 22 on the motion track and the structural parameters of the shaping lens 22.

[0071] Furthermore, the laser wavelength of the first band emitted by the first laser source 11 is 595nm, and the laser wavelength of the second band emitted by the second laser source 12 is 510nm. When the second laser source 12 is used as a measuring light source, the power of the second laser source 12 is adjusted so that the optical power of the second laser source 12 is less than 5mW. Among them, the laser with a wavelength of 595nm can achieve sufficient tissue penetration, while also ensuring the absorption of hemoglobin and sealing blood vessels to achieve better photothermal therapy. Since the 510nm laser is the main absorption peak of the photosensitizer used to treat port wine stains, compared with the 532nm laser used on the market, the photodynamic therapy effect of the 510nm laser is better than that of the 532nm laser in terms of penetration depth and treatment duration. Therefore, using the second laser source 12 that can emit a 510nm wavelength as a photodynamic therapy laser source can enable the laser to better react with the photosensitizer implanted in the patient's diseased tissue, resulting in a better treatment effect.

[0072] Furthermore, the receiving end of the photoelectric CCD detector 3 is installed with a filter and a light attenuation plate. The filter can specifically be a 510nm narrow-band filter for eliminating the influence of stray light of other wavelengths on the ranging light spot received by the photoelectric CCD detector 3; the light attenuation plate is set to a 510nm light attenuation plate for reducing the energy of the reflected light of the ranging light spot reflected back to the photoelectric CCD detector 3 by the diseased tissue, so that the photoelectric CCD detector 3 can work normally and reduce the occurrence of threshold saturation.

[0073] Furthermore, the light source emitting part 1 and the treatment head 2 are separately arranged, and the port-wine stain treatment device also includes a fiber optic connector 4, one end of the fiber optic connector 4 is connected to the shell 21, and the other end is connected to the light source emitting part 1. The light source emitting part 1 and the treatment head 2 are separated by the fiber optic connector 4, so that the treatment head 2 is more portable, and it is easier for the doctor to move the treatment head 2 to achieve the treatment of port-wine stains.

[0074] In other embodiments, the PWS treatment device may further include a support arm, on which the treatment head 2 and the light source emitting unit 1 are fixed, and the position of the treatment head 2 can be moved by moving the support arm. The support arm can be manually controlled by a physician to move the treatment head 2; it can also be electrically controlled to move the treatment head 2, and electrically controlling the movement of the treatment head 2 makes the movement of the treatment head 2 more stable and less prone to rebound.

[0075] An operating method of a port wine stain treatment device provided in an embodiment of the present application comprises the following steps:

[0076] S1: First, the doctor chooses to use the photodynamic effect or the photothermal effect for treatment according to the patient's condition. If the photodynamic effect is used for treatment, a photosensitizer needs to be injected into the patient's diseased tissue. After the treatment head 2 is moved to aim at the patient's diseased tissue, the optical power of the second laser source 12 is adjusted to less than 5mW, and the second laser source 12 emits laser light. The laser light emitted by the second laser source 12 is focused by the shaping lens 22 to form a ranging light spot on the surface of the diseased tissue;

[0077] S2: The image acquisition unit receives the ranging light spot reflected by the surface of the diseased tissue, and at this time, the shaping lens 22 is continuously moved until the smallest ranging light spot is formed on the surface of the diseased tissue, and the image acquisition unit can determine the size of the acquired ranging light spot. When the smallest ranging light spot is formed, the image acquisition unit sends the position information of the shaping lens 22 on the motion guide rail 23 to the data processing unit.

[0078] Furthermore, the ranging light spot is received by the photoelectric CCD detector 3 after being reflected by the diseased tissue, and the lead screw is driven to rotate by the driving source, thereby driving the shaping lens 22 to move along the moving guide rail 23. The position of the shaping lens 22 changes so that the shaping lens 22 focuses the laser emitted by the second laser source 12 to different degrees. The shaping lens 22 is moved until the photoelectric CCD detector 3 receives the minimum reflected light spot, and the ranging light spot is processed to form a ranging light spot size map. When the photoelectric CCD detector 3 receives the minimum ranging light spot, it sends a signal to the data processing unit, and at this time the data processing unit can obtain the position of the moving guide rail 23 where the shaping lens 22 is located according to the number of turns of the lead screw.

[0079] S3: The data processing unit measures the distance H between the treatment probe tip and the diseased tissue according to the position of the shaping lens 22 .

[0080] Specifically, refer to Figure 3 , set the straight-line distance between the laser emission point in the shell 21 and the first end face of the moving guide rail 23 as L1, define the plane where the closest point of the moving guide rail 23 to the laser emission point is located as the first end face, and according to the position information of the plastic lens 22, it can be obtained that the distance L2 between the first end face of the moving guide rail 23 and the center line of the plastic lens 22, the straight-line distance L3 between the plastic lens 22 and the end face of the treatment head 2, and the values ​​of L1 and L2+L3 are constant; according to the structural parameters of the plastic lens 22 and the object-image distance formula, the functional relationship between the distance H and L2 can be obtained, so that the distance H can be calculated through L2.

[0081] According to the lens imaging distance formula: L1+L2 is the object distance, L3+H is the image distance, and f is the equivalent focal length of the shaping lens 22. L1 and L2+L3 are known for a specific system, so it is easy to derive the functional relationship between L2 and H according to the lens imaging distance formula, expressed as L2=f(H), and then calculate H through L2.

[0082] S4: Since the structural parameters of the shaping lens 22 are certain, a calculation program is pre-set in the therapeutic device so that the area of ​​the therapeutic spot formed on the surface of the diseased tissue after the laser passes through the shaping lens 22 can be calculated according to the distance H. The physician inputs the ideal power density of the therapeutic laser into the controller. The power density is equal to the ratio of the laser output light power to the treatment spot area, so that the output light power of the first laser source 11 or the second laser source 12 can be obtained. At this time, the physician can adjust the output light power through the controller.

[0083] Specifically, refer to Figure 4 Assuming that the area of ​​the collimated laser output from the shaping lens 22 is S1, since the structural parameters of the shaping lens 22 are fixed, the laser area of ​​the laser emitted by the second laser source 12 after passing through the shaping lens 22 can be measured. The radius is r, then S1 = πr 2 The collimated laser diverges after passing through the homogenizing structure. Assuming the divergence angle of the homogenizing structure is θ, the treatment spot area formed on the surface of the lesion tissue is S = π[r+Htan(θ)] 2 .

[0084] S5: after determining the output optical power of the first laser source 11 or the second laser source 12, using the laser light emitted by the first laser source 11 or the second laser source 12 to treat the diseased tissue;

[0085] If the photothermal effect is used to treat the diseased tissue, that is, the first laser source 11 emits laser light, and the light homogenizing structure 24 is moved so that the light homogenizing structure 24 is not located on the emission path of the first laser source 11, then the shaping component directly converges the laser light emitted by the first laser source 11 to form a treatment spot on the surface of the diseased tissue for treatment. Usually, the photothermal effect is used to achieve treatment requiring a laser with a wavelength of 595nm, a treatment spot with a width of 1-5mm, a single pulse energy in the range of 1-3J, and a single pulse width of 3ms.

[0086] If the photodynamic effect is used to treat the diseased tissue, that is, the second laser source 12 is used to emit laser light, and the shaping lens 22 is moved until the laser light emitted by the second laser source 12 passes through the shaping lens 22 to form collimated light, and the light homogenizing structure 24 is moved at the same time, so that the formed collimated light passes through the light homogenizing structure 24 to form a uniform treatment spot that is irradiated to the surface of the diseased tissue to achieve treatment. Usually, the photodynamic effect is used to achieve treatment, which requires a laser with a wavelength of 510nm to form a treatment spot with a width of 3-10cm on the surface of the diseased tissue, a continuous output power of 1-10W, and an optical power density range of 80mW / cm 2 -120mW / cm 2 between.

[0087] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A port wine stain treatment device, characterized in that: include: A light source emitting unit (1) is used to selectively emit a first laser source (11) of a first wavelength band and a second laser source (12) of a second wavelength band, wherein the first laser source (11) is used for photothermal therapy, and the second laser source (12) is used for photodynamic therapy and distance measurement; A treatment head (2), comprising a housing (21) and a shaping lens (22) arranged in the housing (21), wherein the shaping lens (22) is movable along its central axis, and is used to receive lasers of different wavelength bands and project a treatment light spot or a distance-measuring light spot onto a diseased tissue; and A host computer comprises an image acquisition unit, a data processing unit and a controller, wherein the controller is electrically connected to the data processing unit and the light source emitting unit (1), the image acquisition unit receives the ranging light spot reflected by the diseased tissue and determines the size of the ranging light spot, and when the ranging light spot area is the smallest, the image acquisition unit feeds back the position of the shaping lens (22) to the data processing unit; The data processing unit obtains the distance H between the light output end of the treatment head (2) and the affected part according to the position of the shaping lens (22), and the controller can adjust the output light power of the treatment spot according to the distance H.

2. A port wine stain treatment device according to claim 1, characterized in that: A motion guide rail (23) and a driving source are also provided in the housing (21); the shaping lens (22) is connected to the motion guide rail (23); the driving source is electrically connected to a central processing module; and the driving source drives the shaping lens (22) to slide along the motion guide rail (23) to achieve shaping of the laser.

3. A port wine stain treatment device according to claim 1, characterized in that: The treatment head (2) is also provided with a light homogenizing structure (24) at the light outlet, and the light homogenizing structure (24) is detachably connected to the housing (21), or the light homogenizing structure (24) is rotatably connected to the housing (21); When the first laser source (11) is working, the light homogenizing structure (24) avoids the laser beam emitted by the first laser source (11); and when the second laser source (12) is working, the light homogenizing structure (24) is located in the light emitting direction of the shaping lens (22).

4. A port wine stain treatment device according to claim 1, characterized in that: The light source emitting part (1) and the treatment head (2) are arranged separately; The port wine stain treatment device further comprises an optical fiber connector (4), wherein the optical fiber connector (4) is connected to the housing (21), and the first laser source (11) and the second laser source (12) included in the light source emitting unit (1) both output light beams to the optical fiber connector (4) via optical fibers.

5. A port wine stain treatment device according to any one of claims 1 to 4, characterized in that: The image acquisition unit comprises a photoelectric CCD detector (3) arranged at the light output end of the treatment head (2); a filter and an attenuation plate are arranged at the light receiving end of the photoelectric CCD detector (3).

6. A port wine stain treatment device according to any one of claims 1 to 4, characterized in that: The wavelength of the first waveband is between 585-595 nm, the wavelength of the second waveband is 510 nm, and the output optical power of the second laser source (12) when used for distance measurement is lower than 5 mW.

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