Microcirculation imaging device and imaging method

Abstract

The invention discloses a microcirculation imaging device and method. The microcirculation imaging device comprises a polarizer, a polarization analyzer, a linkage mechanism, a light source mechanism, a spectroscope, a light guide pipe and an imaging system. Wherein the linkage mechanism comprises a first linkage piece and a second linkage piece, the first linkage piece drives the polarizer to rotate, the second linkage piece drives the polarization analyzer to rotate, and the first linkage piece and the second linkage piece are in transmission connection and keep the polarizer and the polarization analyzer to rotate at the same angle; a light-transmitting hole is formed in the center of the spectroscope; a through hole is formed in the center of the light guide pipe, and an inclined reflective mirror is arranged in the light guide pipe to focus a light path. The polarizer and the analyzer are linked through the linkage mechanism, so that the relative angles of the polarizer and the analyzer are kept consistent, even if the polarizer rotates, the analyzer can be matched with the polarizer to filter polarized light in the corresponding polarization direction, and the imaging precision is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of microcirculation blood vessel imaging, and in particular to a microcirculation imaging device and an imaging method. Background Art

[0002] Microcirculatory vessels refer to the smallest blood vessel network in the human body, including capillaries, arterioles, and venules, which are only a few microns in diameter and cannot be observed with the naked eye. These blood vessels are mainly distributed in tissues such as the skin, mucous membranes, muscles, and internal organs, and play an important role in transporting oxygen and nutrients, and excreting metabolic waste and carbon dioxide. The blood flow rate in microcirculatory vessels is relatively slow, and the blood vessel walls are thinner, allowing them to better exchange substances with surrounding tissues and maintain normal tissue metabolism. The patency of microcirculatory vessels is related to many diseases and health problems, such as hypertension, diabetes, and blood circulation disorders.

[0003] Monitoring microcirculatory vascular function is an important means of saving critically ill patients. By analyzing the imaging of subcutaneous microcirculatory blood vessels, it is helpful for medical staff to detect abnormal conditions of patients in advance and take corresponding measures. At present, the microcirculation imaging method based on orthogonal polarization is a relatively mature solution for subcutaneous microcirculatory vascular imaging. The core idea is to use a polarizer to generate polarized light in a certain direction. After being reflected by vascular tissue, the polarized light enters the analyzer. The analyzer filters out the polarized light in the original direction, and the non-polarized light scattered by the vascular tissue is captured by the imaging system to generate an image.

[0004] However, when the polarization direction of the polarized light generated by the polarizer needs to be adjusted, the relative angle between it and the analyzer will also change, so that the analyzer cannot filter the polarized light in the corresponding direction. Therefore, the user needs to fine-tune the direction of the analyzer synchronously to correspond to the polarizer, which is cumbersome to operate and has low adjustment accuracy, affecting the quality of the final film. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a microcirculation imaging device, which can synchronize the analyzer with the polarizer, so that the analyzer does not need to be adjusted separately after the direction of the polarizer is adjusted.

[0006] The present invention also proposes an imaging method based on the above-mentioned microcirculation imaging device, which can improve the efficiency of microcirculation imaging.

[0007] The microcirculation imaging device according to the first embodiment of the present invention comprises a polarizer, an analyzer, a linkage mechanism, a light source mechanism, a beam splitter, a light guide and an imaging system;

[0008] The linkage mechanism comprises a first linkage member and a second linkage member, wherein the first linkage member drives the polarizer to rotate, and the second linkage member drives the analyzer to rotate, and the first linkage member and the second linkage member are connected in driving manner and keep the polarizer and the analyzer rotating at the same angle;

[0009] A light-transmitting hole is provided in the center of the beam splitter;

[0010] A through hole is provided in the center of the light guide tube, and an inclined reflector is arranged inside the light guide tube to focus the light path;

[0011] The light generated by the light source mechanism sequentially passes through the polarizer, the beam splitter, and the light guide tube and is focused onto the skin of the person being tested. The reflected light sequentially passes through the through hole of the light guide tube, the light-transmitting hole of the beam splitter, and the analyzer and enters the imaging system.

[0012] The microcirculation imaging device according to the embodiment of the present invention has at least the following beneficial effects: the polarizer and the analyzer are linked by a linkage mechanism, so as to keep the relative angles of the polarizer and the analyzer consistent; even if the polarizer rotates, the analyzer can adapt to the polarizer to filter the polarized light of the corresponding polarization direction, thereby ensuring imaging accuracy.

[0013] According to some embodiments of the present invention, the first linkage includes a first bevel gear and a first gear connected in series with an axis, the second linkage includes a second bevel gear and a second gear connected in series with an axis, the first bevel gear is meshed with the second bevel gear, the outer sides of the polarizer and the analyzer are both provided with gear rings, the polarizer is meshed with the first gear, and the analyzer is meshed with the second gear.

[0014] According to some embodiments of the present invention, the first linkage further includes a knob, and the knob drives the first bevel gear and the first gear to rotate.

[0015] According to some embodiments of the present invention, the first linkage also includes a third gear and a fourth gear, the third gear is coaxially connected in series with the first bevel gear and the first gear, the fourth gear is meshed with the third gear, and the knob is connected to the fourth gear.

[0016] According to some embodiments of the present invention, the first linkage member is specifically a first rotating sleeve and is sleeved on the outside of the polarizer, the second linkage member is specifically a second rotating sleeve and is sleeved on the outside of the analyzer, and gear rings are provided at the ends of the first rotating sleeve and the second rotating sleeve, and the first rotating sleeve and the second rotating sleeve are meshed with each other through the gear rings.

[0017] According to some embodiments of the present invention, the gear ring is specifically a bevel gear ring.

[0018] According to some embodiments of the present invention, the microcirculation imaging device also includes a focusing mechanism, which includes a motor, a retractable drum and a rope. The reflector is hinged in the light guide tube, and the rope is wound around the retractable drum. Both ends of the rope are respectively connected to two symmetrical sides of the reflector. The motor drives the retractable drum to rotate so as to pull the reflector to flip through the rope.

[0019] According to some embodiments of the present invention, the focusing mechanism further includes a spring, two ends of which are respectively connected to the reflector and the light guide, and the spring is used to drive the reflector to reset.

[0020] According to some embodiments of the present invention, the microcirculation imaging device also includes a negative pressure stabilization mechanism, which includes a shell and a negative pressure pump. The light guide tube is installed in the shell, and the end of the shell is provided with at least one of a negative pressure hole and a negative pressure groove, and the negative pressure hole and / or the negative pressure groove are both connected to the negative pressure pump through a trachea; the end of the shell is pressed against the skin of the person being tested and adsorption is performed using negative pressure.

[0021] The imaging method according to the second aspect of the present invention is performed based on the above-mentioned microcirculation imaging device, and comprises the following steps:

[0022] Placing the microcirculation imaging device close to the skin of the subject and aiming it at the skin surface;

[0023] Turning on the light source mechanism, so that light is emitted from the light source mechanism;

[0024] The light passes through the polarizer, which filters the light and makes it polarized;

[0025] Rotating the first linkage member so that the polarization direction of the polarizer changes to obtain the required polarized light, and at the same time the second linkage member is driven to drive the analyzer to rotate synchronously to adapt to the polarization direction of the polarizer;

[0026] The light is reflected by the beam splitter and enters the light guide tube, and the reflector in the light guide tube focuses the light onto the skin surface;

[0027] The light is reflected by the skin surface and passes through the through hole of the light guide tube and the light transmission hole of the beam splitter;

[0028] The light passes through the polarizer, and the polarizer filters the polarized light in the light;

[0029] The light from which the corresponding polarized light has been removed enters the imaging system and forms an image.

[0030] The imaging method according to the embodiment of the present invention has at least the following beneficial effects: the analyzer maintains the same relative angle with the polarizer through a linkage mechanism, so that after adjusting the polarizer, there is no need to adjust the analyzer separately, thereby improving detection efficiency and avoiding angle deviation caused by multiple manual adjustments, and the imaging quality is more guaranteed.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] Figure 1 It is a structural schematic diagram of a first embodiment of a microcirculation imaging device of the present invention;

[0034] Figure 2 It is a structural schematic diagram of a second embodiment of the microcirculation imaging device of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the focusing mechanism in the microcirculation imaging device of the present invention;

[0036] Figure 4 It is a partial enlarged view of the negative pressure stabilization mechanism in the microcirculation imaging device of the present invention;

[0037] Figure 5 It is a schematic structural diagram of the negative pressure stabilization mechanism in the microcirculation imaging device of the present invention.

[0038] Figure numerals: 100 - polarizer, 200 - analyzer, 310 - first linkage, 311 - first bevel gear, 312 - first gear, 313 - knob, 314 - third gear, 315 - fourth gear, 316 - first rotating sleeve, 320 - second linkage, 321 - second bevel gear, 322 - second gear, 323 - second rotating sleeve, 400 - light source mechanism, 500 - spectrometer, 510 - light transmission hole, 600 - light guide tube, 610 - through hole, 620 - reflector, 700 - imaging system, 810 - motor, 820 - retractable reel, 830 - rope, 840 - spring, 910 - housing, 911 - negative pressure hole, 912 - negative pressure groove, 920 - negative pressure pump. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0044] Monitoring microcirculatory vascular function is an important means of saving critically ill patients. By analyzing the imaging of subcutaneous microcirculatory blood vessels, it is helpful for medical staff to detect abnormal conditions of patients in advance and take corresponding measures. At present, the microcirculation imaging method based on orthogonal polarization is a relatively mature solution for subcutaneous microcirculatory vascular imaging. The core idea is to use a polarizer to generate polarized light in a certain direction. After being reflected by vascular tissue, the polarized light enters the analyzer. The analyzer filters out the polarized light in the original direction, and the non-polarized light scattered by the vascular tissue is captured by the imaging system to generate an image.

[0045] However, when the polarization direction of the polarized light generated by the polarizer needs to be adjusted, the relative angle between it and the analyzer will also change, so that the analyzer cannot filter the polarized light in the corresponding direction. Therefore, the user needs to fine-tune the direction of the analyzer synchronously to correspond to the polarizer, which is cumbersome to operate and has low adjustment accuracy, affecting the quality of the final film.

[0046] In this regard, the present application proposes a microcirculation imaging device, wherein the polarizer 100 and the analyzer 200 are linked by a linkage mechanism, so as to keep the relative angles of the polarizer 100 and the analyzer 200 consistent, and even if the polarizer 100 rotates, the analyzer 200 can adapt to the polarizer 100 to filter the polarized light of the corresponding polarization direction, thereby ensuring the imaging accuracy. In addition, the present application also proposes an imaging method using the above-mentioned microcirculation imaging device.

[0047] Reference Figure 1 The microcirculation imaging device includes a polarizer 100, an analyzer 200, a linkage mechanism, a light source mechanism 400, a spectroscope 500, a light pipe 600 and an imaging system 700. The polarizer 100 is used to convert ordinary light into polarized light, and the analyzer 200 is used to filter the polarized light emitted by the polarizer 100 so that the non-polarized light reflected by the subcutaneous tissue of the subject is captured by the imaging system 700. The linkage mechanism is used to keep the polarization angle of the analyzer 200 corresponding to the polarization angle of the polarizer 100. The light source mechanism 400 is used to emit light, and the spectroscope 500 is used to reflect the light emitted by the light source mechanism 400 into the light pipe 600, and the light pipe 600 is used to focus the light on the skin surface of the subject.

[0048] Specifically, the linkage mechanism includes a first linkage member 310 and a second linkage member 320. The first linkage member 310 drives the polarizer 100 to rotate, and the second linkage member 320 drives the analyzer 200 to rotate. The first linkage member 310 and the second linkage member 320 are connected in transmission, and keep the polarizer 100 and the analyzer 200 rotating at the same angle, so that the polarization angle of the polarizer 100 corresponds to the polarization angle of the analyzer 200. In the present application, the polarization angle of the polarizer 100 is always kept perpendicular to the polarization angle of the analyzer 200.

[0049] A light-transmitting hole 510 is provided in the center of the beam splitter 500 , a through hole 610 is provided in the center of the light guide 600 , and an inclined reflector 620 is provided in the light guide 600 to focus the light path.

[0050] The light propagation path in the present microcirculation imaging device is as follows: the light generated by the light source mechanism 400 passes through the polarizer 100, the beam splitter 500, and the light guide 600 in sequence, and then is focused on the skin of the subject. The reflected light passes through the through hole 610 of the light guide 600, the light transmission hole 510 of the beam splitter 500, and the analyzer 200 in sequence, and then enters the imaging system 700. Among them, since the polarization angles of the polarizer 100 and the analyzer 200 are perpendicular, the polarized light cannot pass through the analyzer 200, and only the non-polarized light scattered in the subcutaneous tissue of the subject passes through the analyzer 200, so that the imaging system 700 can display the image of the subcutaneous tissue of the subject.

[0051] The present application proposes two possible embodiments for the transmission connection between the first linkage member 310 and the second linkage member 320. It is easy to understand that the present invention is not limited to the embodiments, and various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

[0052] First embodiment:

[0053] Reference Figure 1 The first linkage member 310 includes a first bevel gear 311 and a first gear 312 connected in series by an axis, and the second linkage member 320 includes a second bevel gear 321 and a second gear 322 connected in series by an axis, and the first bevel gear 311 meshes with the second bevel gear 321 to achieve linkage. The outer sides of the polarizer 100 and the analyzer 200 are both sleeved with a gear ring, and the polarizer 100 meshes with the first gear 312 through the gear ring thereon, and the analyzer 200 meshes with the second gear 322 through the gear thereon. Therefore, when the polarizer 100 rotates, the gear ring thereon drives the first gear 312 to rotate, and then transmits the rotational force to the second gear 322 through the linkage of the first bevel gear 311 and the second bevel gear 321, and finally drives the analyzer 200 to rotate. It is worth noting that the gear ratio between the polarizer 100 and the first gear 312 is equal to the gear ratio between the analyzer 200 and the second gear 322 , and the first bevel gear 311 and the second bevel gear 321 also maintain a transmission ratio of 1:1, ensuring that the rotation angles of the polarizer 100 and the analyzer 200 are consistent.

[0054] Further, the first linkage 310 further includes a knob 313, which is used to be held by a user to drive the first bevel gear 311 and the first gear 312 to rotate. Specifically, the first linkage 310 further includes a third gear 314 and a fourth gear 315, the third gear 314 is coaxially connected in series with the first bevel gear 311 and the first gear 312, the fourth gear 315 is meshed with the third gear 314, and the knob 313 is connected with the fourth gear 315. Thus, when the knob 313 is turned, the rotational force is transmitted from the meshed fourth gear 315 and the third gear 314 to the first gear 312 and the first bevel gear 311, respectively driving the polarizer 100 and the analyzer 200 to rotate.

[0055] Second embodiment:

[0056] Reference Figure 2 The first linkage member 310 is specifically a first rotating sleeve 316 and is sleeved on the outer side of the polarizer 100, and the second linkage member 320 is specifically a second rotating sleeve 323 and is sleeved on the outer side of the analyzer 200. The ends of the first rotating sleeve 316 and the second rotating sleeve 323 are both provided with gear rings, and the first rotating sleeve 316 and the second rotating sleeve 323 are meshed with each other through the gear rings. When the first rotating sleeve 316 is rotated, the polarizer 100 therein rotates accordingly, and at the same time, since the first rotating sleeve 316 is meshed with the second rotating sleeve 323, the second rotating sleeve 323 and the analyzer 200 therein are further driven to rotate, completing the linkage action.

[0057] Furthermore, the gear ring may specifically be a spur gear ring or a bevel gear ring.

[0058] The microcirculation imaging device also includes a focusing mechanism. Figure 3 The focusing mechanism includes a motor 810, a retractable drum 820 and a rope 830. The reflector 620 is hinged in the light guide 600 and can be flipped around the hinge axis to adjust the reflection angle. The rope 830 is wound around the retractable drum 820, and the two ends of the rope 830 are respectively connected to the symmetrical sides of the reflector 620. The motor 810 drives the retractable drum 820 to rotate so as to pull the reflector 620 through the rope 830 to flip.

[0059] Furthermore, the focusing mechanism further includes a spring 840, the two ends of which are respectively connected to the reflector 620 and the light guide 600, and the spring 840 is used to drive the reflector 620 to reset. Therefore, when the pulling force of the rope 830 on the reflector 620 is reduced, the spring 840 can timely push the reflector 620 to reset, so that the position of the reflector 620 can be controlled.

[0060] Furthermore, the microcirculation imaging device also includes a negative pressure stabilization mechanism. Figure 4 and Figure 5, the negative pressure stabilization mechanism includes a shell 910 and a negative pressure pump 920, and the light guide 600 is installed in the shell 910. The end of the shell 910 is provided with at least one of a negative pressure hole 911 and a negative pressure groove 912, and the negative pressure hole 911 and / or the negative pressure groove 912 are connected to the negative pressure pump 920 through an air tube. When in use, the end of the shell 910 is pressed against the skin of the person being tested. After the negative pressure pump 920 is started, negative pressure is generated in the negative pressure hole 911 and / or the negative pressure groove 912 at the end of the shell 910, and the skin of the person being tested is adsorbed. Thus, the end of the shell 910 is closely attached to the skin of the person being tested, which can further ensure the stability of the detection process on the one hand, and can make the skin surface smoother and the imaging clearer during detection on the other hand.

[0061] An imaging method in an embodiment of the second aspect of the present application is performed based on the above-mentioned microcirculation imaging device, comprising the following steps:

[0062] S100. Bring the microcirculation imaging device close to the skin of the subject and align it with the skin surface;

[0063] S200. Turn on the light source mechanism 400, and light is emitted from the light source mechanism 400;

[0064] S300. The light passes through the polarizer 100, and the polarizer 100 filters the light and makes it polarized light;

[0065] S400. Rotate the first linkage member 310 so that the polarization direction of the polarizer 100 changes to obtain the desired polarized light, and at the same time the second linkage member 320 is driven and drives the analyzer 200 to rotate synchronously to adapt the polarization direction of the polarizer 100;

[0066] S500. The light is reflected by the beam splitter 500 and enters the light guide 600. The reflector 620 in the light guide 600 focuses the light onto the skin surface;

[0067] S600. The light is reflected by the skin surface and passes through the through hole 610 of the light guide 600 and the light transmission hole 510 of the beam splitter 500;

[0068] S700. The light passes through the analyzer 200, and the analyzer 200 filters the polarized light in the light;

[0069] S800. The light from which the corresponding polarized light has been removed enters the imaging system 700 and forms an image.

[0070] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A microcirculation imaging device, characterized in that: It includes a polarizer, an analyzer, a linkage mechanism, a light source mechanism, a beam splitter, a light guide and an imaging system; The linkage mechanism comprises a first linkage member and a second linkage member, wherein the first linkage member drives the polarizer to rotate, and the second linkage member drives the analyzer to rotate, and the first linkage member and the second linkage member are connected in driving manner and keep the polarizer and the analyzer rotating at the same angle; A light-transmitting hole is provided in the center of the beam splitter; A through hole is provided in the center of the light guide tube, and an inclined reflector is arranged inside the light guide tube to focus the light path; The light generated by the light source mechanism sequentially passes through the polarizer, the beam splitter, and the light guide tube and is focused onto the skin of the person being tested. The reflected light sequentially passes through the through hole of the light guide tube, the light-transmitting hole of the beam splitter, and the analyzer and enters the imaging system.

2. The microcirculation imaging device according to claim 1, characterized in that: The first linkage member includes a first bevel gear and a first gear connected in series by an axis, the second linkage member includes a second bevel gear and a second gear connected in series by an axis, the first bevel gear is meshed with the second bevel gear, the outer sides of the polarizer and the analyzer are both provided with gear rings, the polarizer is meshed with the first gear, and the analyzer is meshed with the second gear.

3. The microcirculation imaging device according to claim 2, characterized in that: The first linkage also includes a knob, and the knob drives the first bevel gear and the first gear to rotate.

4. The microcirculation imaging device according to claim 3, characterized in that: The first linkage also includes a third gear and a fourth gear, the third gear is coaxially connected in series with the first bevel gear and the first gear, the fourth gear is meshed with the third gear, and the knob is connected to the fourth gear.

5. The microcirculation imaging device according to claim 1, characterized in that: The first linkage member is specifically a first rotating sleeve and is sleeved on the outside of the polarizer. The second linkage member is specifically a second rotating sleeve and is sleeved on the outside of the analyzer. Gear rings are provided at the ends of the first rotating sleeve and the second rotating sleeve, and the first rotating sleeve and the second rotating sleeve are meshed with each other through the gear rings.

6. The microcirculation imaging device according to claim 5, characterized in that: The gear ring is specifically a bevel gear ring.

7. The microcirculation imaging device according to any one of claims 1 to 6, characterized in that: The microcirculation imaging device also includes a focusing mechanism, which includes a motor, a retractable drum and a rope. The reflector is hinged in the light guide tube. The rope is wound around the retractable drum. Both ends of the rope are respectively connected to two symmetrical sides of the reflector. The motor drives the retractable drum to rotate so as to pull the reflector to flip through the rope.

8. The microcirculation imaging device according to claim 7, characterized in that: The focusing mechanism further comprises a spring, two ends of which are respectively connected to the reflector and the light guide, and the spring is used for driving the reflector to reset.

9. The microcirculation imaging device according to any one of claims 1 to 6, characterized in that: The microcirculation imaging device also includes a negative pressure stabilization mechanism, which includes a shell and a negative pressure pump. The light guide tube is installed in the shell, and at least one of a negative pressure hole and a negative pressure groove is opened at the end of the shell. The negative pressure hole and / or the negative pressure groove are both connected to the negative pressure pump through an air tube; the end of the shell is pressed against the skin of the person being tested and adsorption is performed using negative pressure.

10. An imaging method, performed based on the microcirculation imaging device according to any one of claims 1 to 9, characterized in that: include: Placing the microcirculation imaging device close to the skin of the subject and aiming it at the skin surface; Turning on the light source mechanism, so that light is emitted from the light source mechanism; The light passes through the polarizer, which filters the light and makes it polarized; Rotating the first linkage member so that the polarization direction of the polarizer changes to obtain the required polarized light, and at the same time the second linkage member is driven to drive the analyzer to rotate synchronously to adapt to the polarization direction of the polarizer; The light is reflected by the beam splitter and enters the light guide tube, and the reflector in the light guide tube focuses the light onto the skin surface; The light is reflected by the skin surface and passes through the through hole of the light guide tube and the light transmission hole of the beam splitter; The light passes through the polarizer, and the polarizer filters the polarized light in the light; The light from which the corresponding polarized light has been removed enters the imaging system and forms an image.

Images