Illumination structure for a surgical microscope

Abstract

The utility model provides a kind of illumination structure of surgical microscope, including illuminating mirror body, be set to the lens inside of surgical microscope;Coaxial illumination light path, be set to inside illuminating mirror body, including coaxial illumination light source and coaxial illumination reflector, the light emitted by coaxial illumination light source is after reflection by the coaxial illumination reflector and is directed to the large objective lens of surgical microscope;Main illumination light path, be set to inside illuminating mirror body, including main illumination light source, the light emitted by main illumination light source is directed to large objective lens;Coaxial illumination light path is relative to the oblique arrangement of main illumination light path, the deflection angle of coaxial illumination reflector and the inclination angle of coaxial illumination light path cooperate, to make after the illumination light reflected by coaxial illumination reflector and the observation light path of surgical microscope keep coaxial;Two light sources are LED cold light source, coaxial illumination light path and main illumination light path are mutually independent control. According to different surgical procedure and the clinical needs of different stages of operation, the brightness ratio of two light sources is adjusted.

Description

Technical Field

[0001] This utility model mainly relates to the field of ophthalmic medical equipment technology, specifically to an illumination structure for a surgical microscope. Background Technology

[0002] Ophthalmic surgical microscopes are essential instruments in ophthalmic clinical surgery. Ophthalmic surgery demands high precision, and the anatomical structures of the eye are minute in size, requiring microscopic magnification for clear observation of ocular tissues. In the continuous circular capsulorhexis process of cataract surgery, the illumination and observation light paths must be kept coaxial. The illumination light enters the eye along the observation light path within the microscope, and the light reflects off the retina, creating an orange-red reflection. Against this orange-red background, the capsule appears as a translucent gray line, allowing the surgeon to clearly distinguish the anterior capsule edge and observe the outline and direction of the capsulorhexis tear. Different surgical procedures and stages require varying levels of observation and light safety protection for ocular tissues, necessitating the use of multiple functional filters. The light path typically incorporates filters such as anti-red filters, blue light filters, and black spot filters to filter or block unwanted wavelengths of light, switching between them as needed during the surgery.

[0003] Most existing ophthalmic surgical microscopes use halogen lamps as their illumination source. Halogen lamp light source components are bulky and cannot be integrated into the microscope head; they must be externally mounted on the instrument stand, relying on optical fibers to guide the light to the lens, resulting in a complex overall structure. Halogen lamps are heat sources, releasing significant amounts of infrared heat radiation during operation. Furthermore, halogen lamps have a short effective lifespan, requiring frequent bulb replacements during clinical use, leading to high consumable and maintenance costs. Based on these considerations, a novel illumination structure for surgical microscopes is proposed. Utility Model Content

[0004] This invention provides an illumination structure for a surgical microscope to solve the technical problems existing in the background art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: An illumination structure for a surgical microscope includes: The illumination scope is located inside the lens of the surgical microscope; A coaxial illumination optical path is set inside the illumination mirror body, including a coaxial illumination source and a coaxial illumination reflector. The light emitted by the coaxial illumination source is reflected by the coaxial illumination reflector and then directed to the large objective lens of the surgical microscope. The main illumination path is located inside the illumination lens body and includes a main illumination source. The light emitted by the main illumination source is directed toward the large objective lens. The coaxial illumination optical path is inclined relative to the main illumination optical path, and the deflection angle of the coaxial illumination reflector is matched with the tilt angle of the coaxial illumination optical path so that the illumination light reflected by the coaxial illumination reflector remains coaxial with the observation optical path of the surgical microscope. Both the coaxial lighting source and the main lighting source are LED cold light sources, and the coaxial lighting optical path and the main lighting optical path are controlled independently.

[0006] Preferably, the coaxial illumination optical path further includes a coaxial illumination condenser lens group, a coaxial illumination aperture, a coaxial illumination filter, and a coaxial illumination projection lens group. The light emitted by the coaxial illumination source is converged by the coaxial illumination condenser lens group, passes through the coaxial illumination aperture and the coaxial illumination filter, and is then projected onto the coaxial illumination reflector by the coaxial illumination projection lens group.

[0007] Preferably, the coaxial illumination source is equipped with two LED light-emitting devices, which respectively form two illumination beams. Each illumination beam is coaxial with the observation light path on the corresponding side, and the angle between the two illumination beams matches the stereoscopic angle of the surgical microscope.

[0008] Preferably, the main illumination optical path further includes a main illumination condenser lens group, a main illumination filter assembly, a main illumination aperture, a main illumination projection lens, and a main illumination reflector. The light emitted by the main illumination source is converged by the main illumination condenser lens group, passes through the main illumination filter assembly and the main illumination aperture, and is then projected by the main illumination projection lens to the main illumination reflector, and is reflected by the main illumination reflector into the large objective lens.

[0009] Preferably, the main illumination filter assembly includes one set of main illumination filter discs and two sets of main illumination filter discs. Each set of filter discs has multiple filter holes, and filters with different functions are installed in each filter hole. The different filters can be switched by rotating the filter disc.

[0010] Preferably, the main illumination filter set includes: The filter disc has multiple filter holes; Filter holder; A filter disc spindle passes through the filter base and is fixedly connected to the filter disc. One end of the filter disc spindle is provided with a connecting ring, and the outer surface of the connecting ring is provided with positioning grooves equal in number to the holes of the filter disc. A spring plunger is installed in a plunger seat, which is fixedly connected to the filter seat. The ball head of the spring plunger abuts against the outer circular surface of the connecting ring and can be engaged in the positioning groove during rotation. A bevel gear meshes with bevel teeth on the optical disc shaft of the filter. The bevel gear shaft passes through the bevel gear seat and is fixedly connected to the bevel gear.

[0011] Preferably, the second set of main illumination filter discs has the same structure as the first set of main illumination filter discs.

[0012] Preferably, the coaxial illumination filter is disposed in a two-pass filter switching mechanism, the two-pass filter switching mechanism comprising: The adjustment base is fixed to the body of the illumination mirror; The filter holder has a through circular hole; The rotating shaft passes through the through circular hole and is fixedly connected to the adjusting seat, and the filter plate seat can rotate around the rotating shaft; A filter is fixedly installed at one end of the filter holder; A lever is fixedly installed at the other end of the filter holder; The upper limit screw and the lower limit screw are installed on the adjusting seat to constrain the rotational stroke of the filter holder.

[0013] Preferably, the upper limit screw and the lower limit screw are magnets, and the filter holder is made of a magnetically conductive material.

[0014] Preferably, it also includes an extinction stop disposed at the end of the coaxial illumination projection lens assembly to block non-imaging stray light.

[0015] Compared with the prior art, the technical solution provided by this utility model has the following advantages: This invention employs an LED cold light source as the illumination source inside the microscope head, integrating the main illumination optical path and the coaxial illumination optical path within the microscope head cavity, eliminating the need for long-distance optical fiber transmission. Utilizing the low heat generation of the LED cold light source, it reduces the damage to eye tissues caused by heat radiation.

[0016] The main illumination and coaxial illumination support independent control. The on / off state and brightness adjustment of the two light sources are not linked. The brightness ratio of the two light sources can be adjusted according to the clinical needs of different surgical procedures and different stages of surgery.

[0017] Meanwhile, filter elements with different functions and filter switching mechanisms are set in the main illumination path and the coaxial illumination path respectively, so that doctors can switch flexibly according to the surgical conditions.

[0018] To address the red light reflection requirements of cataract surgery, coaxial illumination employs a three-dimensional coaxial illumination architecture, ensuring that the illumination optical path and the observation optical path are coaxial, thereby obtaining high-quality three-dimensional red light reflection images and meeting the clinical needs of delicate procedures such as capsulorhexis. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 A sectional view; Figure 3 This is a schematic diagram of the overall structure of the main lighting filter disc of this utility model; Figure 4 This utility model Figure 3 A diagram illustrating the split state; Figure 5 This is a cross-sectional view of the spring plunger of this utility model; Figure 6 This is a schematic diagram of the coaxial lighting filter structure of this utility model.

[0020] Among them, 1-coaxial illumination source, 2-coaxial illumination condenser lens group, 3-coaxial illumination aperture, 4-coaxial illumination filter, 41-filter, 42-filter holder, 43-lower limit screw, 44-adjustment seat, 45-upper limit screw, 46-rotating shaft, 47-lever, 5-coaxial illumination projection lens group, 6-extinction aperture, 7-coaxial illumination reflector, 8-illumination mirror body, 9-main illumination source, 10-main illumination condenser lens group, 11-main illumination filter disc group 111-Filter disc, 1111-Filter hole, 112-Spring plunger, 1121-Ball head, 1122-Spring, 113-Plunger seat, 114-Bevel gear seat, 115-Bevel gear shaft, 116-Filter seat, 117-Filter disc shaft, 118-Bevel gear, 119-Connecting ring; 1191-Positioning groove, 12-Two sets of main illumination filter discs, 13-Main illumination aperture, 14-Main illumination projection mirror, 15-Main illumination reflector, 16-Large objective lens. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Reference Figure 1-6This embodiment provides an illumination structure for a surgical microscope, the main components of which are: 1-coaxial illumination source, 2-coaxial illumination condenser lens group, 3-coaxial illumination aperture, 4-coaxial illumination filter, 5-coaxial illumination projection lens group, 6-extinction aperture, 7-coaxial illumination reflector, 8-illumination body, 9-main illumination source, 10-main illumination condenser lens group, 11-main illumination filter group 1, 12-main illumination filter group 2, 13-main illumination aperture, 14-main illumination projection lens, 15-main illumination reflector, 16-large objective lens.

[0024] The optical path in this invention is divided into two parts: a coaxial illumination optical path and a main illumination optical path, both of which are independently controlled. The coaxial illumination optical path structure is as follows: the coaxial illumination source 1 is equipped with two LED light-emitting devices. The light emitted by the source is collected and focused by the coaxial illumination condenser lens group 2, then passes through the coaxial illumination aperture 3, and is projected by the coaxial illumination projection lens group 5. After being reflected by the coaxial illumination reflector 7, it enters the large objective lens 16 and finally illuminates the eye. To prevent light damage to the eye during surgery, a coaxial illumination filter 4 is provided in this optical path to filter out harmful light. The extinction aperture 6, located at the end of the coaxial illumination projection lens group 5, is used to block stray light from entering the imaging optical path, ensuring image quality.

[0025] The optical path structure of the main illumination light path is as follows: the light emitted by the main illumination source 9 is converged by the main illumination condenser lens group 10, and then passes through the first group of main illumination filter discs 11 and the second group of main illumination filter discs 12 for filtering. After passing through the main illumination aperture 13, the light enters the main illumination projection lens 14. After being projected by the main illumination projection lens 14 and reflected by the main illumination reflector 15, the light also enters the large objective lens 16. The first group of main illumination filter discs 11 and the second group of main illumination filter discs 12 are respectively equipped with filters with different functions, and the filter switching is completed by rotation.

[0026] Rotating filter discs occupy significant installation space. If the coaxial illumination path and main illumination path are arranged parallel, the overall height of the illumination component increases, leading to a larger lens size. To reduce the overall height of the illumination component and compress the eye-to-object distance of the surgical microscope lens to a reasonable range, this invention arranges the coaxial illumination path at an angle. The deflection angle of the coaxial illumination reflector 7 is calibrated and fixed during the assembly of the illumination structure and remains unchanged during use. In this embodiment, the tilt angle of the coaxial illumination path relative to the main illumination path is 37°. This angle matches the installation tilt angle of the coaxial illumination reflector 7, ensuring that the reflected illumination light remains coaxial with the observation path. It should be noted that 37° is only a preferred value in this embodiment. Depending on different lens structure sizes and eye-to-object distance requirements, this tilt angle can also be other values; simply adjusting the installation angle of the reflector 7 accordingly will achieve coaxial illumination. Two LEDs of the coaxial illumination source 1 emit light, which is transmitted through the lens assembly to form two light paths. Each illumination path is coaxial with the observation light path on the corresponding side. The angle between the two illumination paths matches the stereoscopic angle of the microscope, so that the doctor's left and right eyes receive the fundus red light reflection with parallax, forming a three-dimensional red light reflection image.

[0027] The two sets of filter discs (main illumination filter disc group 11 and main illumination filter disc group 2) are equipped with filters with different functions, and different filters can be switched by rotating them.

[0028] Taking the main illumination filter disc group 11 as an example, the switching structure and working principle of the multi-pass filter are explained. The filter disc 111 has multiple filter holes 1111, allowing different functional filters to be installed in the filter holes 1111 as needed. The filter disc shaft 117 passes through the filter base 116 and is fixedly connected to the filter disc 111. The other end of the filter disc shaft 117 is provided with a connecting ring 119. The outer surface of the connecting ring 119 has a number of fixed holes equal to the number of filter holes on the filter disc 111. The positioning groove 1191 is used to stably position the filter in operation. A spring plunger 112 works in conjunction with the positioning groove 1191 to fix the working position of the filter. The spring plunger 112 is installed in the plunger seat 113, which is fixed to the filter seat 116. The ball head 1121 of the spring plunger 112 rests in the positioning groove 1191. Rotating the filter disc shaft 117 switches the filter position. The ball head 1121 of the spring plunger 112 always maintains contact with the outer circle of the connecting ring 119. During rotation, the outer circle pushes the ball head 1121 inward, compressing the spring 1122. When rotating to the corresponding filter, the ball head springs into the positioning groove 1191 under the elastic force of the spring 1122, producing a clear tactile feel of the position and simultaneously achieving circumferential positioning, indicating that the filter has rotated to the preset working position. The bevel gear 118 meshes with the bevel teeth on the filter disc shaft 117. The bevel gear shaft 115 passes through the bevel gear seat 114 and is fixed to the bevel gear 118. When the bevel gear shaft 115 rotates (via the knob), the power changes the direction of motion through the meshing transmission between the bevel gear 118 and the bevel teeth of the filter disc shaft 117, thereby driving the filter disc 111 to rotate.

[0029] Taking the coaxial illumination filter 4 as an example, the switching structure and working principle of the two-way filter are explained. The adjusting seat 44 is fixed to the illumination mirror body 8, and an upper limit screw 45 and a lower limit screw 43 are installed on the adjusting seat 44. A through-hole is machined on the filter holder 42. The rotating shaft 46 passes through this hole and is fixed to the adjusting seat 44. The filter holder 42 can rotate around the rotating shaft 46 as the center, and the rotation range is constrained by the upper limit screw 45 and the lower limit screw 43. One end of the filter holder 42 is fixedly fitted with the filter 41, and the other end is fixed to the lever 47. Moving the lever 47 up and down will rotate the entire filter holder 42, causing the filter 41 to enter or exit the optical path working position. The upper limit screw 45 and the lower limit screw 43 can be magnets, and the filter holder 42 is made of magnetically conductive material, improving the positioning accuracy and working stability of the filter holder 42 after rotational limitation.

[0030] This invention arranges the main illumination optical path and the coaxial illumination optical path inside the lens, eliminating the need for an external light-guiding fiber optic transmission structure. To reduce the lens height and avoid spatial interference between the two illumination optical paths, the coaxial illumination optical path is arranged at a preset tilt angle. This, combined with the installation tilt angle of the coaxial illumination reflector, ensures that the coaxial illumination optical path and the observation imaging optical path remain coaxial.

[0031] The lighting source of this invention uses a cold LED light source, which generates low heat during operation, effectively reducing heat production and heat absorption in the surgical area, thus mitigating the risk of thermal damage to eye tissues. Simultaneously, the long lifespan of the LED light source reduces the frequency of replacement. The main lighting path and the coaxial lighting path are independent of each other, allowing them to operate independently or synchronously, thereby adapting to the different lighting needs of various ophthalmic surgeries.

[0032] The multi-channel filter of this invention is installed on the filter disc, and the filter is switched cyclically by rotating the filter disc. The spring plunger ensures the reliable positioning of the filter.

[0033] The two-position filter of this utility model can switch the working position of the filter by a lever, which is convenient to operate and can quickly control the filter to enter or exit the optical path.

[0034] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An illumination structure for a surgical microscope, characterized in that, include: The illumination mirror (8) is located inside the lens of the surgical microscope; The coaxial illumination optical path is set inside the illumination mirror body (8) and includes a coaxial illumination source (1) and a coaxial illumination reflector (7). The light emitted by the coaxial illumination source (1) is reflected by the coaxial illumination reflector (7) and then directed to the large objective lens (16) of the surgical microscope. The main illumination path is located inside the illumination lens body (8) and includes a main illumination source (9). The light emitted by the main illumination source (9) is directed toward the large objective lens (16). The coaxial illumination optical path is arranged at an angle relative to the main illumination optical path. The deflection angle of the coaxial illumination reflector (7) is matched with the tilt angle of the coaxial illumination optical path so that the illumination light reflected by the coaxial illumination reflector (7) remains coaxial with the observation optical path of the surgical microscope. Both the coaxial lighting source (1) and the main lighting source (9) are LED cold light sources, and the coaxial lighting optical path and the main lighting optical path are controlled independently.

2. The illumination structure of a surgical microscope according to claim 1, characterized in that, The coaxial illumination optical path also includes a coaxial illumination condenser lens group (2), a coaxial illumination aperture (3), a coaxial illumination filter (4), and a coaxial illumination projection lens group (5). The light emitted by the coaxial illumination light source (1) is converged by the coaxial illumination condenser lens group (2), passes through the coaxial illumination aperture (3) and the coaxial illumination filter (4), and is then projected onto the coaxial illumination reflector (7) by the coaxial illumination projection lens group (5).

3. The illumination structure of a surgical microscope according to claim 1, characterized in that, The coaxial illumination source (1) is equipped with two LED light-emitting devices. The two LED light-emitting devices form two illumination beams respectively. Each illumination beam is coaxial with the observation beam on the corresponding side. The angle between the two illumination beams matches the stereoscopic angle of the surgical microscope.

4. The illumination structure of a surgical microscope according to claim 1, characterized in that, The main illumination optical path also includes a main illumination condenser lens group (10), a main illumination filter assembly, a main illumination aperture (13), a main illumination projection lens (14), and a main illumination reflector (15). The light emitted by the main illumination source (9) is converged by the main illumination condenser lens group (10), passes through the main illumination filter assembly and the main illumination aperture (13), and is then projected by the main illumination projection lens (14) to the main illumination reflector (15). After being reflected by the main illumination reflector (15), the light enters the large objective lens (16).

5. The illumination structure of a surgical microscope according to claim 4, characterized in that, The main illumination filter assembly includes a main illumination filter disc group (11) and a main illumination filter disc group (12). Each filter disc group has multiple filter holes (1111), and each filter hole (1111) is equipped with a filter with a different function. The different filters can be switched by rotating the filter disc.

6. The illumination structure of a surgical microscope according to claim 5, characterized in that, The main illumination filter set (11) includes: The filter disc (111) has multiple filter holes (1111). Filter mount (116); The filter disc spindle (117) passes through the filter base (116) and is fixedly connected to the filter disc (111). One end of the filter disc spindle (117) is provided with a connecting ring (119). The outer surface of the connecting ring (119) is provided with positioning grooves (1191) equal in number to the filter holes (1111). A spring plunger (112) is installed in a plunger seat (113), which is fixedly connected to the filter seat (116). The ball head (1121) of the spring plunger (112) abuts against the outer circular surface of the connecting ring (119) and can be inserted into the positioning groove (1191) during rotation. A bevel gear (118) meshes with a bevel tooth on the filter disc shaft (117); The bevel gear shaft (115) passes through the bevel gear seat (114) and is fixedly connected to the bevel gear (118).

7. The illumination structure of a surgical microscope according to claim 5, characterized in that, The second set (12) of the main illumination filter discs has the same structure as the first set (11) of the main illumination filter discs.

8. The illumination structure of a surgical microscope according to claim 2, characterized in that, The coaxial illumination filter (4) is disposed in the two-pass filter switching mechanism, which includes: Adjustment seat (44) is fixed to the illumination mirror body (8); The filter holder (42) has a through hole; The rotating shaft (46) passes through the through hole and is fixedly connected to the adjusting seat (44). The filter plate seat (42) can rotate around the rotating shaft (46). A filter (41) is fixedly installed at one end of the filter holder (42); A lever (47) is fixedly installed at the other end of the filter plate holder (42); The upper limit screw (45) and the lower limit screw (43) are installed on the adjusting seat (44) to constrain the rotation stroke of the filter plate seat (42).

9. The illumination structure of a surgical microscope according to claim 8, characterized in that, The upper limit screw (45) and the lower limit screw (43) are magnets, and the filter holder (42) is made of magnetic material.

10. The illumination structure of a surgical microscope according to claim 2, characterized in that, It also includes an extinction stop (6) located at the end of the coaxial illumination projection lens group (5) to block non-imaging stray light.

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