Visual treatment hand tool

Abstract

The invention relates to the field of laser treatment equipment, and discloses a visual laser treatment hand tool which comprises a light adjusting assembly (comprising two vertical rotating reflectors), a laser transmitter and an image acquisition assembly. And the laser emitter coaxially mixes and outputs the invisible treatment laser and the visible indication laser of the conduction optical fiber through the dichroscope. The image acquisition assembly is composed of a fixed lens group on an angle adjusting plate and a rotatable sensor, and full-field-depth imaging of an inclined laser area is realized based on the Sammer-Frasugrel theorem. According to the device, treatment laser interference is avoided through an independent imaging light path, the structure is simplified, and the imaging quality is improved. The angle adjusting plate cooperatively controls the angle of the optical assembly, breaks through the limitation of the traditional depth of field, and provides precise visual feedback for laser treatment.

Description

Technical Field

[0001] The present invention relates to the field of laser treatment equipment, and in particular to a visual treatment hand tool. Background Art

[0002] Laser therapy is a medical technique that uses high-energy-density beams of light to target human tissue for therapeutic purposes. This treatment method is widely used in various medical fields, including but not limited to dermatology, ophthalmology, surgery, and dentistry, due to its precision, controllability, and minimal side effects.

[0003] In laser treatment equipment, in order to obtain clearer real-time images of the treatment area during the quality control process so that relevant personnel can more accurately adjust the laser treatment parameters, it is usually necessary to obtain images of the laser action area to provide relevant personnel with timely and clear information about the treatment area. However, existing equipment usually adds a dichroic mirror in the laser output light path. The dichroic mirror allows the treatment laser to pass through while achieving a semi-transparent and semi-reflective effect for the indicator laser. In this way, the light reflected from the laser action area can be separated from the light path and then introduced into other imaging light paths for imaging. However, this approach often has a weakening effect on the output of the treatment laser, affecting the treatment effect. In addition, the energy of the visible light separated from the light path may be low, resulting in unsatisfactory image presentation. Summary of the Invention

[0004] In view of this, the present invention provides a visual therapeutic handpiece to at least partially solve the problems existing in the prior art.

[0005] According to one aspect of the present invention, there is provided a visualization therapy handpiece, comprising: two light adjustment components, a laser emitter, and an image acquisition component; The light adjustment assembly includes an adjustment shaft and a reflector, wherein the reflector is arranged at the rotating end of the adjustment shaft; the rotation directions of the two reflectors are perpendicular to each other; The laser transmitter includes a transmission optical fiber, an indicator laser transmitter and a dichroic mirror; The invisible laser emitted by the transmission optical fiber and the visible indicator laser emitted by the indicator laser emitter have propagation directions perpendicular to each other. A dichroic mirror is set at the intersection of the invisible laser and the visible indicator laser to coincide the optical axes of the invisible laser and the visible indicator laser to form a mixed laser. The mixed laser is reflected by two reflectors in sequence and then emitted from the laser scanning lens. The image acquisition component includes a first lens group, an angle adjustment plate and a first light sensor; The angle adjustment plate is rotatably mounted on one side of the laser scanning lens, and the first lens group is fixedly mounted on the angle adjustment plate to obtain image information of the laser action area; the first photosensor is rotatably mounted on the angle adjustment plate; The photosensitive plane of the first photosensitive sensor, the lens plane of the first lens group and the imaging plane intersect on the same straight line.

[0006] The technical solution of the present invention has at least the following beneficial effects: In this invention, by placing an image acquisition assembly on the side of the laser injection end, the tilted lens of the assembly can directly capture images of the laser's active area, eliminating the need to split visible light from the existing output optical path for imaging. This method not only improves imaging quality but also eliminates the need for optical path splitting components, without affecting the therapeutic laser.

[0007] Due to the tilted configuration of the lens relative to the imaging plane, the camera's depth of field doesn't fully cover the laser action area, resulting in blurred portions of the captured image. In the present invention, the angle between the first lens group and the first photosensor can be adjusted via an angle adjustment plate. According to the Schaum-Flager theorem, the camera lens plane, the imaging plane (i.e., the camera's photosensitive element or film plane), and the scene plane where a clear image is desired can converge on the same straight line. This maximizes the depth of field and ensures a clear image is obtained at every location in the laser action area, which is tilted relative to the lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0009] Figure 1 This is a schematic diagram of the overall structure of a visual therapeutic hand tool in one embodiment of the present application; Figure 2 This is a schematic diagram of the internal structure of a visual therapeutic handpiece according to another embodiment of the present application, wherein the double dashed line represents the propagation path of light; Figure 3 This is a structural diagram of an image acquisition component in another embodiment of the present application; Figure 4 This is a schematic diagram of the decomposed structure of an image acquisition component in another embodiment of the present application; Figure 5 This is a schematic diagram of the optical path structure when the first lens group is a telecentric lens group in another embodiment of the present application; Figure 6 This is a diagram showing the image distortion result when the first lens group is a telecentric lens group in another embodiment of the present application; Figure 7This is a diagram showing the image distortion result when the first lens group is a normal lens group in another embodiment of the present application, wherein the two red parallel dashed lines are schematic lines indicating the original spacing between the two black horizontal lines; Figure 8 This is a diagram showing the image distortion result when the first lens group is a telecentric lens group in another embodiment of the present application.

[0010] Reference numerals 1. Light adjustment assembly; 11. Adjustment shaft; 12. Reflector; 2. Laser emitter; 21. Fiber optic conduit; 22. Indicator laser emitter; 23. Dichroic mirror; 24. Collimating lens; 3. Image acquisition assembly; 31. First adjustment plate; 32. First hinged ear; 33. Second hinged ear; 34. Second adjustment plate; 35. First photosensor; 36. Angle adjustment knob; 37. First lens group; 4. Laser scanning lens; 5. Fixed ruler. DETAILED DESCRIPTION

[0011] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0012] It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments may be combined with each other; and, based on the embodiments in this disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of this disclosure.

[0013] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0014] As an embodiment of the present invention, Figures 1 to 4 As shown, a visualization treatment handpiece is provided, comprising: two light adjustment components 1, a laser emitter 2 and an image acquisition component 3.

[0015] like Figure 2 As shown, the light adjustment component 1 includes an adjustment shaft 11 and a reflector 12. The reflector 12 is arranged at the rotating end of the adjustment shaft 11. The rotation directions of the two reflectors 12 are perpendicular to each other. In this embodiment, the light adjustment component 1 can be a galvanometer.

[0016] By configuring two reflectors 12 with mutually perpendicular swing directions, the emitted laser can be swung in two orthogonal directions, allowing the mixed laser to repeatedly scan within a specific area. This structure enhances the flexibility of the laser beam and can improve the scanning efficiency within a specific area.

[0017] like Figure 2 As shown, the laser transmitter 2 includes a transmission optical fiber, an indicator laser transmitter 22 and a dichroic mirror 23 .

[0018] The transmission fiber passes through the fiber optic conduit 21 and into the corresponding light-emitting location. The invisible laser light (typically a therapeutic laser) emitted by the transmission fiber and the visible indicator laser light emitted by the indicator laser emitter 22 propagate perpendicularly. A dichroic mirror 23, positioned at the intersection of the invisible and visible indicator lasers, aligns the optical axes of the invisible and visible indicator lasers, forming a mixed laser. After being reflected by two reflectors, the mixed laser light is emitted from the laser scanning lens 4.

[0019] In this embodiment, the dichroic mirror 23 transmits the visible indicator laser light and reflects the invisible laser light. The dichroic mirror 23 is a special type of optical filter that selectively reflects or transmits light based on its wavelength. In this embodiment, the appropriate model of dichroic mirror 23 is selected based on the wavelength difference between the invisible laser light and the visible indicator laser light.

[0020] In addition, the visible indicator laser can be a red laser, which is emitted by a laser that emits red light, and generally has a wavelength between about 630 and 700 nanometers.

[0021] In this embodiment, the dichroic mirror 23 is arranged at a 45-degree angle at one end of the light output port of the red laser emitter 2. Due to the transmission and reflection effects of the dichroic mirror 23 on the visible indicator laser and the invisible laser, the invisible laser and the visible indicator laser passing through the dichroic mirror 23 can be mixed into the same optical path to form a mixed laser.

[0022] The laser emitter 2 also includes a collimating lens 24. This lens is positioned in the outgoing optical path of the mixed laser light. This lens focuses the two parallel laser beams onto a single point, further increasing the overlap between the visible indicator laser and the invisible laser light after mixing. This ensures that the red indicator area on the skin or scalp is essentially the entire laser active area.

[0023] like Figure 3 and Figure 4 As shown, the image acquisition component 3 includes a first lens group 37 , an angle adjustment plate and a first photosensor 35 .

[0024] The angle adjustment plate is rotatably mounted on one side of the laser scanning lens 4. The first lens group 37 is fixedly mounted on the angle adjustment plate to obtain image information of the laser action area. The first photosensor 35 is rotatably mounted on the angle adjustment plate.

[0025] Specifically, the angle adjustment plate includes a first adjustment plate 31 , a second adjustment plate 34 and an angle adjustment knob 36 .

[0026] The first adjustment plate 31 is provided with a first hinged lug 32 and a second hinged lug 33 . The first hinged lug 32 is hingedly connected to the housing on one side of the laser scanning lens 4 . The first lens group 37 is provided on the first adjustment plate 31 .

[0027] A second hinged lug 33 is disposed on the central axis of the first adjustment plate 31, and a second adjustment plate 34 is rotatably connected to the second hinged lug 33. An angle adjustment knob 36 is rotatably mounted on the second adjustment plate 34, with its end abutting against the first adjustment plate 31. A first light sensor 35 is disposed on the second adjustment plate 34.

[0028] The first hinged lug 32 allows the entire image acquisition assembly 3 to rotate, thereby adjusting the angle relative to the central axis of the emission port. This also allows the first lens assembly 37 to tilt and directly capture an image of the laser's active area. The first hinged lug 32 allows the second adjustment plate 34 to rotate relative to the first adjustment plate 31, thereby adjusting the angle between the two. Because the first photosensor 35 is mounted on the second adjustment plate 34 and the first lens assembly 37 is mounted on the first adjustment plate 31, the deflection angle between the first photosensor 35 and the first lens assembly 37 can be adjusted.

[0029] Thus, through the articulated arrangement of the first hinged lug 32 and the second hinged lug 33, the light-sensitive plane of the first photosensor 35, the lens plane of the first lens assembly 37, and the imaging plane can be adjusted to intersect on the same straight line. According to the Schaum-Flager theorem, the camera lens plane, the imaging plane (i.e., the camera's light-sensitive element or film plane), and the scene plane where a clear image is desired should all intersect on the same straight line, maximizing depth of field and ensuring a clear image at every position in the laser's active area, which is tilted relative to the lens assembly.

[0030] In this embodiment, the first photosensor 35 and the second photosensor may both be CCD (Charge-Coupled Device) sensors or CMOS (Complementary Metal-Oxide-Semiconductor) sensors.

[0031] In addition, the visualization treatment handpiece further comprises a fixed ruler 5 .

[0032] The fixed ruler 5 is connected to the laser scanning lens 4 and is used to fix the distance between the laser scanning lens 4 and the laser action area.

[0033] In this embodiment, although the first light sensor 35 and the lens group are tilted to each other, a clearer image of all positions in the laser action area can be obtained. However, since the distance between the first lens group 37 and the laser action area is relatively close (usually 80mm to 120mm) and the tilt angle of the first lens group 37 is relatively large, the image obtained under this structure will have a large keystone distortion. Figure 7 As shown, from left to right, the distance between the two originally parallel black straight lines gradually increases, which is H3 <H2 Figure 5 As shown, the first lens group 37 is set as a telecentric lens group.

[0034] The telecentric lens assembly in this embodiment provides an "aperture stop" in the optical path (i.e., limiting the angle of the principal ray) so that the principal ray can enter or leave the lens essentially parallel to the optical axis. This allows for a constant field of view in a specific direction (object side, image side, or both sides). Even if the object moves forward or backward, the image size remains unchanged, avoiding the "larger near, smaller far" distortion. Ultimately, this eliminates the perspective distortion (also known as keystone distortion) caused by conventional lenses when shooting at an angle.

[0035] Specifically, in order to further clearly illustrate the distortion elimination effect of the telecentric lens group in this embodiment, as an example, the telecentric lens group in this embodiment can use an existing commercially available 0.24X telecentric lens, and its corresponding relevant parameters are shown in the following Table 1: Table 1 .

[0036] In addition, when using different telecentric lenses, in order to obtain a clearer and distortion-free image, it is necessary to adaptively adjust the angle between the central axis of the first lens group 37 and the central axis of the laser scanning lens 4, and the angle between the photosensitive plane of the first photosensitive sensor 35 and the lens plane of the first lens group 37.

[0037] In this embodiment, Figure 5 As shown in FIG. 1 , when a 0.24X telecentric lens is used, the angle between the central axis of the first lens group 37 and the central axis of the laser scanning lens 4 is 45°, and the angle between the photosensitive plane of the first photosensitive sensor 35 and the lens plane of the first lens group 37 is 11°. The distortion effect of the image measured at this angle is as follows: Figure 6 ​As shown, the maximum distortion is -0.016%, which is much smaller than the conventional 10%. It can be seen that the trapezoidal distortion of the image is basically eliminated in this embodiment. The specific situation of the captured image is as follows: Figure 8 As shown, the original two parallel black lines from left to right basically coincide with the red parallel auxiliary lines, that is, H3≈H2≈H1.

[0038] As another possible embodiment of the present invention, the image acquisition component 3 is replaced by: a second lens group and a second photosensor.

[0039] The second lens group is arranged on one side of the laser scanning lens 4, and its central axis is parallel to the central axis of the laser scanning lens 4. The field of view of the second lens group covers the laser action area.

[0040] The central axis of the second light-sensitive sensor is eccentrically arranged with respect to the central axis of the second lens group, and the second light-sensitive sensor is used for receiving incident light corresponding to the laser action area.

[0041] The offset between the second photosensitive sensor and the second lens group in this embodiment can be achieved through a software solution or a hardware mechanism.

[0042] Software solution: Read data from only a specific sub-area of ​​the sensor. For example, in the programming interface, the starting pixel (x, y) and the desired width and height are set based on the position of the incident light corresponding to the laser active area, and the data within this window is read for imaging.

[0043] Hardware Solution: In this embodiment, the image acquisition assembly 3 can be installed based on the position of the incident light beam in the laser action area, so that only the corresponding CCD (or CMOS) sensor is located in that area. Specifically, a position offset plate can be provided to offset and fix the second light-sensitive sensor and the second lens group, similar to the angle adjustment plate in the above embodiment.

[0044] In this embodiment, the second lens group is set to a lens with a large field of view angle, so that even if the lens is not tilted, the field of view can cover the laser action area. Then, by biasing the second photosensitive sensor, the imaging light corresponding to the laser action area in all the acquired field of view imaging light is selectively converted and processed to obtain image information of the laser action area. In this embodiment, since the lens and the plane to be imaged are perpendicular to each other, no trapezoidal distortion will be generated, and ultimately a high-quality image of the laser action area is obtained.

[0045] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A visual therapeutic handpiece, characterized in that: include: Two light adjustment components, laser transmitter and image acquisition component; The light adjustment assembly includes an adjustment shaft and a reflector, wherein the reflector is arranged at a rotating end of the adjustment shaft; the rotation directions of the two reflectors are perpendicular to each other; The laser transmitter includes a transmission optical fiber, an indicator laser transmitter and a dichroic mirror; The invisible laser light emitted by the transmission optical fiber and the visible indicator laser light emitted by the indicator laser emitter have propagation directions perpendicular to each other; the dichroic mirror is disposed at the intersection of the invisible laser light and the visible indicator laser light, and is used to align the optical axes of the invisible laser light and the visible indicator laser light to form a mixed laser light; the mixed laser light is sequentially reflected by the two reflective mirrors and then emitted from the laser scanning lens; The image acquisition component includes a first lens group, an angle adjustment plate and a first light sensor; The angle adjustment plate is rotatably mounted on one side of the laser scanning lens, and the first lens group is fixedly mounted on the angle adjustment plate for acquiring image information of the laser action area; the first photosensor is rotatably mounted on the angle adjustment plate; The photosensitive plane of the first photosensitive sensor, the lens plane of the first lens group and the imaging plane intersect on the same straight line.

2. A visual therapy handpiece according to claim 1, characterized in that: The first lens group is a telecentric lens group; The angle between the central axis of the first lens group and the central axis of the laser scanning lens is 45°, and the angle between the photosensitive plane of the first photosensitive sensor and the lens plane of the first lens group is 11°.

3. The visualization therapy handpiece according to claim 1, characterized in that: The image acquisition component is replaced by: a second lens group and a second light-sensitive sensor; The second lens group is arranged on one side of the laser scanning lens, and the central axis is parallel to the central axis of the laser scanning lens; the field of view of the second lens group covers the laser action area; The central axis of the second light-sensitive sensor is eccentrically arranged with respect to the central axis of the second lens group, and the second light-sensitive sensor is used to receive incident light corresponding to the laser action area.

4. The visualization therapy handpiece according to claim 1, characterized in that: The angle adjustment plate includes a first adjustment plate, a second adjustment plate and an angle adjustment knob; The first adjustment plate is provided with a first hinged ear and a second hinged ear, the first hinged ear being hingedly connected to the housing on one side of the laser scanning lens; the first lens group is provided on the first adjustment plate; The second hinged ear is arranged on the central axis of the first adjustment plate, and the second adjustment plate is rotatably connected to the second hinged ear; the angle adjustment knob is rotated on the second adjustment plate, and its end is abutted against the first adjustment plate; the first photosensor is arranged on the second adjustment plate.

5. The visualization therapy handpiece according to claim 1, characterized in that: Includes fixed ruler; The fixed ruler is connected to the laser scanning lens and is used to fix the distance between the laser scanning lens and the laser action area.

6. The visualization therapy handpiece according to claim 3, characterized in that: The first photosensor and the second photosensor are CCD sensors or CMOS sensors.

7. The visualization therapy handpiece according to claim 1, characterized in that: The light adjustment component is a galvanometer.

8. The visualization therapy handpiece according to claim 1, characterized in that: The dichroic mirror has a transmitting effect on the visible indicator laser and a reflecting effect on the invisible laser.

9. The visualization therapy handpiece according to claim 8, characterized in that: The laser transmitter further includes a collimating lens; The collimating lens is arranged on the outgoing light path of the mixed laser.

10. The visualization therapy handpiece according to claim 1, characterized in that: The visible indicator laser is a red laser.

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