Near-infrared fluorescent endoscope optical imaging lens group with novel design

Abstract

The utility model belongs to the technical field of optical imaging, and particularly relates to a novel designed optical imaging lens group of a near-infrared fluorescent endoscope, which comprises a handle main body, an outer lens tube is fixedly arranged on the handle main body, and an eyepiece module for eyepiece imaging and an optical module for optical imaging are respectively arranged on the handle main body. An emission optical filter limited and fixed through an anti-falling optical filtering module is further arranged in the outer lens tube, a negative lens body telescopically adjusted through an imaging adjusting module is further arranged at the end, away from the handle body, of the outer lens tube, the anti-falling optical filtering module comprises a first lens sleeve and a first shading cylinder, a step groove is formed in the first lens sleeve, and an elastic pressing ring is further arranged in the step groove in a sleeved mode; and one end of the first lens sleeve is in threaded fit connection with a locking screw ring. According to the optical imaging lens group of the near-infrared fluorescence endoscope, the first lens sleeve, the step groove, the elastic pressing ring, the locking screw ring and the second lens sleeve of the anti-falling light filtering module are cooperated and matched, so that accurate positioning and tight fixing of the emission light filter are realized.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging technology, and in particular to a novel design of a near-infrared fluorescence endoscope optical imaging lens assembly. Background Technology

[0002] Infrared fluorescence endoscopy is a minimally invasive medical diagnostic and treatment device that integrates near-infrared fluorescence imaging technology with traditional endoscopic technology. Its working wavelength typically extends to the visible-near-infrared light band (around 400-900 nm). It can be combined with fluorescent agents (such as indocyanine green) to achieve fluorescence imaging of in vivo tissues, while also being compatible with standard white light imaging. With the advantages of stronger tissue penetration and lower biological autofluorescence interference from near-infrared light, it can clearly display key anatomical structures, tumor boundaries, and lymph nodes that are difficult to observe under white light. It plays an important role in the early diagnosis, intraoperative navigation, and postoperative evaluation of diseases such as gastrointestinal tumors, significantly improving the safety and precision of minimally invasive surgery, and has become one of the important tools in the field of modern minimally invasive diagnosis and treatment.

[0003] As the core component of a near-infrared fluorescence endoscope, the optical imaging endoscope assembly is responsible for receiving, transmitting, and imaging fluorescence and visible light signals. Its performance directly determines the endoscope's imaging clarity, signal-to-noise ratio, and diagnostic reliability. The filter, a key optical element in the imaging endoscope assembly, separates near-infrared fluorescence signals from excitation and stray light. Its installation precision and stability directly affect the filtering effect, thus determining image quality—the filter's film thickness must be controlled at the nanometer level; any minute deviation will cause center wavelength drift, directly affecting diagnostic accuracy. Furthermore, because medical endoscopes need to directly enter human cavities, they must undergo high-temperature, high-pressure sterilization after use to prevent cross-infection.

[0004] Existing filters are often fixed using traditional adhesive methods. However, during repeated high-temperature and high-pressure sterilization, the adhesive will age and soften due to temperature changes, resulting in a decrease in the connection strength between the filter and the lens assembly base. This can lead to filter displacement and tilting. Furthermore, most of the negative lenses in existing near-infrared fluorescence endoscopes are designed with a fixed focal length. Since surgical scenarios are complex and varied, the working distance of the endoscope will constantly change with the surgical operation and the position of the cavity. This requires the doctor to frequently move the entire endoscope back and forth, which can easily cause discomfort to the patient. Utility Model Content

[0005] In order to overcome the defects of the prior art mentioned above, the inventors conducted in-depth research and, after a great deal of creative work, completed this utility model.

[0006] Specifically, the technical problem to be solved by this utility model is to provide a novel near-infrared fluorescence endoscope optical imaging lens assembly to solve the technical problems of the current traditional use of adhesive to fix the filter, which causes the filter to shift and tilt after repeated high temperature and high pressure sterilization due to the aging and softening of the adhesive, and the negative lens is a fixed design with a fixed focal length, which requires doctors to frequently move the endoscope, causing discomfort to the patient.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A novel near-infrared fluorescence endoscope optical imaging assembly includes a handle body, an outer endoscope tube fixedly mounted on the handle body, an eyepiece module for eyepiece imaging and an optical imaging module respectively provided on the handle body, an emission filter fixed by an anti-detachment filter module in the outer endoscope tube, and a negative lens body that is telescopically adjustable by an imaging adjustment module at the end of the outer endoscope tube away from the handle body.

[0009] An endoscope tube is fitted inside the outer endoscope tube and distributed along the axial direction of the outer endoscope tube. Objective lens bodies for objective lens imaging are arranged inside the endoscope tube, and the anti-detachment filter module is located between the two sets of objective lens bodies.

[0010] The anti-detachment filter module includes a first lens sleeve and a first light shield that fit with the endoscope tube. The first lens sleeve has a stepped groove adapted to the emission filter. An elastic pressure ring is also fitted in the stepped groove. One end of the first lens sleeve is threadedly connected to a locking screw ring. The two ends of the elastic pressure ring are respectively abutted and connected to the emission filter and the locking screw ring.

[0011] As an improved technical solution, the first lens sleeve is provided with symmetrically distributed docking blocks, and the end of the first lens sleeve away from the first light shield is provided with a second lens sleeve that is in clearance fit with the locking screw ring. The second lens sleeve is provided with a docking groove that matches the docking blocks, and the locking screw ring is provided with a pin hole that corresponds to the docking groove. The locking screw ring is fixedly installed between the first lens sleeve and the second lens sleeve by a pin passing through the docking blocks, the docking groove and the pin hole in sequence.

[0012] As an improved technical solution, a second light-shielding tube is fixedly installed at the end of the second lens cover away from the first lens cover, and both the second and first light-shielding tubes are provided with light-shielding ring grooves for absorbing stray light. The light-shielding ring grooves are arranged corresponding to the imaging optical path in the endoscope tube, and the light-shielding ring grooves are coated with an ultra-black light-absorbing coating.

[0013] As an improved technical solution, the inner diameter of the light-shielding ring groove on the side of the first lens cover facing the emission filter is gradually reduced, and the inner diameter of the light-shielding ring groove on the side of the second light-shielding tube away from the emission filter is gradually reduced.

[0014] As an improved technical solution, the eyepiece module includes an eyepiece body fixedly installed inside the handle body. An eyepiece cover is fixedly installed on the end of the eyepiece body away from the outer endpiece tube and on the handle body. An eyepiece window for protecting the eyepiece body is provided at the end of the eyepiece cover near the eyepiece body.

[0015] As an improved technical solution, the optical module includes a light cone fixedly mounted on the handle body, an excitation filter is provided at one end of the light cone extending into the imaging optical path in the handle body, an illuminance fiber for optical illumination is also provided on the light cone, and the illumination optical path in the external lens tube is distributed along the axial direction of the illuminance fiber.

[0016] As an improved technical solution, the imaging adjustment module includes a guide sleeve, and a sealing rubber ring that fits the clearance of the objective lens body is provided on the guide sleeve. The sealing rubber ring is also provided with an optical fiber hole corresponding to the illumination optical fiber, and the optical fiber hole is eccentrically set with respect to the negative lens body.

[0017] The guide sleeve is also slidably connected to a guide shaft along its axial direction. The guide sleeve is provided with a reset air injection port. A reset piston chamber communicating with the reset air injection port is opened in the guide sleeve. An end head is fixedly installed at one end of the guide sleeve away from the negative lens body. A propulsion piston chamber is opened in the end head. A propulsion air injection port communicating with the propulsion piston chamber is provided on the end head.

[0018] As an improved technical solution, a first piston that is clearance-fitted with the propulsion piston chamber is fixedly installed at one end of the guide shaft cylinder. The propulsion piston chamber is separated from the reset piston chamber by the first piston. A lens cylinder is slidably connected to the guide shaft cylinder along its axial direction. The negative lens body is fixedly installed at one end of the lens cylinder that protrudes from the guide shaft cylinder. A lens cylinder piston chamber that communicates with the propulsion piston chamber is opened in the guide shaft cylinder. A second piston that is clearance-fitted with the lens cylinder piston chamber is fixedly installed at one end of the lens cylinder in the guide shaft cylinder, and the lens cylinder piston chamber is separated from the propulsion piston chamber by the second piston.

[0019] As an improved technical solution, the handle body is also provided with symmetrically distributed air tube interfaces, which are connected to the reset air injection port and the propulsion air injection port through air tubes respectively.

[0020] After adopting the above technical solution, the beneficial effects of this utility model are:

[0021] 1. This utility model achieves precise positioning and tight fixation of the emission filter through the coordinated cooperation of the first lens sleeve, stepped groove, elastic pressure ring, locking screw ring and second lens sleeve of the anti-detachment filter module.

[0022] 2. This utility model, through the cooperation of the first light-shielding tube, the second light-shielding tube and the light-shielding ring groove, combined with the ultra-black light-absorbing coating in the light-shielding ring groove and the step-like structure of gradual miniaturization, can block stray light from different angles in layers, efficiently absorb stray light and reduce its reflection interference.

[0023] 3. This utility model, through the guide sleeve, guide shaft, lens tube and piston structure of the imaging adjustment module, combined with the air pressure driving action of the tracheal interface, reset air inlet and advance air inlet, realizes the coarse and fine adjustment of the negative lens body, without the need for doctors to frequently move the endoscope. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0025] Figure 1 This is a three-dimensional structural diagram of the optical imaging lens assembly of the novel near-infrared fluorescence endoscope designed according to this utility model.

[0026] Figure 2 This is a cross-sectional structural diagram of the optical imaging lens assembly of the novel near-infrared fluorescence endoscope designed according to this utility model.

[0027] Figure 3 This is a schematic diagram of the installation structure of the anti-detachment filter module and the emission filter of this utility model.

[0028] Figure 4 This is an exploded view of the assembly structure of the anti-detachment filter module and the emission filter of this utility model.

[0029] Figure 5 This is a schematic diagram of the installation structure of the first lens cover and the first light shield of this utility model.

[0030] Figure 6 This is a three-dimensional structural diagram of the imaging adjustment module and the negative lens body of this utility model.

[0031] Figure 7 This is a side view diagram of the imaging adjustment module and the negative lens body of this utility model.

[0032] Figure 8 This is a cross-sectional view of the imaging adjustment module and the negative lens body of this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Handle body; 11. Tracheal inlet; 2. External endoscope tube; 21. Internal endoscope tube; 22. Objective lens body; 3. Eyepiece module; 31. Eyepiece body; 32. Eyepiece cover; 33. Eyepiece window; 4. Optical module; 41. Optical cone; 411. Excitation filter; 412. Illumination fiber; 5. Anti-detachment filter module; 51. First lens sleeve; 511. Step groove; 5111. Elastic retaining ring; 512. Connecting block; 52. First light shield; 53. Locking screw ring; 531. Pin hole; 54. 541. Docking slot; 55. Second light-shielding tube; 56. Light-shielding ring groove; 6. Emission filter; 7. Imaging adjustment module; 71. Guide sleeve; 711. Sealing ring; 7111. Fiber optic hole; 712. Reset gas injection port; 713. Reset piston chamber; 72. End; 721. Advance piston chamber; 722. Advance gas injection port; 73. Guide shaft tube; 731. Lens tube piston chamber; 732. First piston; 74. Lens tube; 741. Second piston; 8. Negative lens body. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0036] Examples, such as Figures 1-8As shown in the figure, this embodiment provides a novel near-infrared fluorescence endoscope optical imaging assembly. This novel near-infrared fluorescence endoscope optical imaging assembly includes a handle body 1, an outer endoscope tube 2 fixedly mounted on the handle body 1, an eyepiece module 3 for eyepiece imaging, and an optical module 4 for optical imaging, respectively. The outer endoscope tube 2 also contains an emission filter 6 fixed by an anti-detachment filter module 5. The end of the outer endoscope tube 2 away from the handle body 1 also has an imaging adjustment... The module 7 is a telescopically adjustable negative lens body 8. An inner endoscope tube 21, distributed along the axial direction of the outer endoscope tube 2, is fitted inside the outer endoscope tube 2. Objective lens bodies 22 for objective lens imaging are arranged within the inner endoscope tube 21. An anti-detachment filter module 5 is located between the two sets of objective lens bodies 22. The anti-detachment filter module 5 includes a first lens sleeve 51 and a first light-shielding tube 52 that fit with the inner endoscope tube 21. A stepped groove 511, adapted to the emission filter 6, is formed inside the first lens sleeve 511. An elastic pressure ring 511 is also fitted within the stepped groove 511. 1. One end of the first lens sleeve 51 is threadedly connected to a locking ring 53. The two ends of the elastic pressure ring 5111 are respectively connected to the emission filter 6 and the locking ring 53. The handle body 1 serves as the base for holding and installing the entire lens assembly. The outer lens tube 2 is used to protect the internal endoscope tube 21 and various optical components. The endoscope tube 21 provides a mounting carrier for the objective lens body 22 and the anti-detachment filter module 5. The two objective lens bodies 22 work together to transmit imaging light. The anti-detachment filter module 5 is used to stabilize the emission filter 6. Limiting and preventing displacement, the stepped groove 511 is used to accurately position the emission filter 6, the elastic pressure ring 5111 provides elastic buffering, the locking screw ring 53 is threadedly engaged with the first lens sleeve 51, and the emission filter 6 is tightly fixed by squeezing the elastic pressure ring 5111, which effectively alleviates the problem of easy aging and displacement of the emission filter 6 by the traditional method of fixing it with adhesive. In addition, the external endoscope tube 2 and the internal endoscope tube 21 in this device are rigid straight tubes, which can also be replaced by medical tubing. The angle can be adjusted by bending the tubing.

[0037] The first lens sleeve 51 is provided with symmetrically distributed mating blocks 512. At the end of the first lens sleeve 51 away from the first light-shielding tube 52, there is a second lens sleeve 54 that fits with a locking screw ring 53. The second lens sleeve 54 has a mating groove 541 that matches the mating blocks 512, and the locking screw ring 53 has a pin hole 531 corresponding to the mating groove 541. The locking screw ring 53 is fixedly installed on the first lens sleeve 51 and the second lens sleeve 52 by a pin passing through the mating blocks 512, the mating groove 541, and the pin hole 531 in sequence. Between the two lens sleeves 54, the insertion and engagement of the docking block 512 and the docking slot 541 achieves precise docking and positioning of the first lens sleeve 51 and the second lens sleeve 54, preventing relative rotation between the two from affecting the installation accuracy of the filter. The pin passes through the docking block 512, the docking slot 541 and the pin hole 531 in sequence, fixing the locking ring 53, the first lens sleeve 51 and the second lens sleeve 54 into one unit, further improving the overall structural stability of the anti-detachment filter module 5 and meeting the structural reliability requirements after repeated high temperature and high pressure sterilization.

[0038] A second light-shielding tube 55 is fixedly installed at the end of the second lens sleeve 54 away from the first lens sleeve 51. Both the second light-shielding tube 55 and the first light-shielding tube 52 are provided with light-shielding ring grooves 56 for absorbing stray light. The light-shielding ring grooves 56 are correspondingly arranged in the imaging optical path in the endoscope tube 21. The light-shielding ring grooves 56 are coated with an ultra-black light-absorbing coating. The first light-shielding tube 52 and the second light-shielding tube 55 are used to block stray light outside the imaging optical path to avoid stray light interfering with the imaging quality. The light-shielding ring grooves 56 increase the contact area of ​​stray light. With the ultra-black light-absorbing coating inside, stray light can be absorbed efficiently, reducing the impact of stray light reflection on the filtering effect of the emission filter 6.

[0039] The inner diameter of the light-shielding ring groove 56 on the side of the first lens cover 51 facing the emission filter 6 is gradually reduced, and the inner diameter of the light-shielding ring groove 56 on the side away from the emission filter 6 is gradually reduced. The light-shielding ring groove 56 adopts a step-by-step reduction structure design to form a stepped light-shielding structure, which can block stray light from different angles in layers, prevent stray light from propagating along the optical path to the emission filter 6 and the objective lens body 22, and further optimize the light-shielding effect.

[0040] The eyepiece module 3 includes an eyepiece body 31 fixedly installed inside the handle body 1. An eyepiece cover 32 is fixedly installed on the end of the eyepiece body 31 away from the outer endpiece tube 2 and on the handle body 1. An eyepiece window 33 is provided on the end of the eyepiece cover 32 near the eyepiece body 31 to protect the eyepiece body 31. The eyepiece body 31 is used to magnify the imaging light transmitted by the objective lens body 22, making it easier for doctors to observe the condition of internal tissues. The eyepiece cover 32 is used to fit the doctor's eyes, reduce external light interference, and improve observation comfort. The eyepiece window 33 is made of transparent protective material, which can effectively protect the optical surface of the eyepiece body 31 and prevent dust, liquid and other contaminants from adhering.

[0041] The optical module 4 includes a light cone 41 fixedly mounted on the handle body 1. One end of the light cone 41 extending into the imaging optical path in the handle body 1 is provided with an excitation filter 411. The light cone 41 is also provided with an illuminance fiber 412 for optical illumination. The illumination optical path in the external lens tube 2 is distributed along the axis of the illuminance fiber 412. The light cone 41 is used to conduct excitation light and imaging light, realize the convergence and conduction of light, and improve the light utilization rate. The excitation filter 411 is used to filter stray light in the excitation light, ensure the purity of the excitation light, and avoid interference with fluorescence imaging. The illuminance fiber 412 is used to transmit illumination light. Its distribution along the axis of the external lens tube 2 can ensure that the illumination light uniformly covers the observation area, providing sufficient and uniform light source for imaging and ensuring clear imaging in dim environments such as internal cavities.

[0042] The imaging adjustment module 7 includes a guide sleeve 71, on which a sealing rubber ring 711 is fitted with a clearance fit to the objective lens body 22. The sealing rubber ring 711 also has a fiber optic hole 7111 corresponding to the illumination fiber optic cable 412. The fiber optic hole 7111 is eccentrically positioned with respect to the negative lens body 8. A guide shaft cylinder 73 is slidably connected to the guide sleeve 71 along its axial direction. The guide sleeve 71 has a reset gas injection port 712. A reset piston chamber 713 communicating with the reset gas injection port 712 is opened in the guide sleeve 71. An end head 72 is fixedly installed at the end of the guide sleeve 71 away from the negative lens body 8. A push piston chamber 721 is opened in the end head 72. The 2 is provided with a propulsion air injection port 722 connected to the propulsion piston chamber 721. The guide sleeve 71 is the basic mounting carrier of the imaging adjustment module 7. The sealing rubber ring 711 is used to seal the gap between the guide sleeve 71 and the objective lens body 22 to prevent steam from seeping in during high temperature and high pressure sterilization, and at the same time to avoid light leakage in the optical path. The fiber optic hole 7111 is used to avoid the illumination fiber 412. The eccentric setting can avoid the interference between the illumination light and the imaging light. The reset air injection port 712 and the reset piston chamber 713 cooperate with the propulsion air injection port 722 and the propulsion piston chamber 721 to realize the axial sliding of the guide shaft cylinder 73 through air pressure drive, thereby driving the negative lens body 8 to extend and retract.

[0043] A first piston 732, which is clearance-fitted with the push piston chamber 721, is fixedly installed at one end of the guide shaft cylinder 73 located in the end 72. The push piston chamber 721 is separated from the reset piston chamber 713 by the first piston 732. A lens cylinder 74 is slidably connected to the guide shaft cylinder 73 along its axial direction. The negative lens body 8 is fixedly installed at one end of the lens cylinder 74 that protrudes from the guide shaft cylinder 73. A lens cylinder piston chamber 731, which communicates with the push piston chamber 721, is opened in the guide shaft cylinder 73. A second piston 741, which is clearance-fitted with the lens cylinder piston chamber 731, is fixedly installed at one end of the lens cylinder 74 located in the guide shaft cylinder 73. The piston chamber 731 is separated from the propulsion piston chamber 721 by the second piston 741. The first piston 732 cooperates with the propulsion piston chamber 721 and the reset piston chamber 713, and drives the guide shaft cylinder 73 to slide axially along the guide sleeve 71 through the air pressure difference, thereby realizing the coarse adjustment of the negative lens body 8. The second piston 741 cooperates with the endoscope barrel piston chamber 731 to realize the fine adjustment of the lens barrel 74, thereby realizing the precise extension and retraction adjustment of the negative lens body 8, meeting the imaging needs of different working distances during the operation, without requiring the doctor to frequently move the endoscope. When the negative lens body 8 needs to be extended, the external air supply device is connected through the air tube interface 1 on the handle body 1. 1. Gas is continuously injected into the propulsion air inlet 722 through the air tube. The gas enters the propulsion piston chamber 721, increasing the gas pressure inside the chamber and pushing the first piston 732 forward. The first piston 732 drives the guide shaft cylinder 73, which is fixed to it, to slide forward along the axial direction of the guide sleeve 71, realizing the extension action of the guide shaft cylinder 73. During this process, gas enters the lens barrel piston chamber 731 through the end hole of the first piston 732, causing the gas pressure in the cavity of the lens barrel piston chamber 731 near the first piston 732 to increase, thereby pushing the second piston 741 forward. The second piston 741 drives the lens fixed to it. The lens cylinder 74 slides forward along the axial direction of the guide shaft cylinder 73, thereby extending the negative lens body 8. The guide shaft cylinder 73 can only extend after the lens cylinder 74 is fully extended. During the reset operation, the external air supply device injects gas into the reset air injection port 712 through another air pipe interface 11. The gas enters the reset piston chamber 713, the gas pressure in the chamber increases and pushes the first piston 732 to move backward. At the same time, the gas in the push piston chamber 721 is extracted, so that a pressure difference appears between the two chambers. The first piston 732 drives the guide shaft cylinder 73 to slide backward along the axial direction of the guide sleeve 71, thereby realizing the reset and retraction of the guide shaft cylinder 73.Simultaneously, the gas entering the reset piston chamber 713 enters the lens barrel piston chamber 731 through the shaft hole of the guide shaft cylinder 73, pushing the second piston 741 to drive the lens barrel 74 to slide axially along the guide shaft cylinder 73, thereby causing the negative lens body 8 to retract. The lens barrel 74 can only retract after the guide shaft cylinder 73 is fully retracted. The outer wall of the second piston 741 and the inner wall of the lens barrel piston chamber 731 are in a clearance-sealed fit. When the second piston 741 moves within the lens barrel piston chamber 731, it divides the lens barrel piston chamber 731 into two independent pressure chambers. By changing the pressure difference between the two pressure chambers, the direction of movement of the second piston 741 can be precisely adjusted, thereby achieving flexible extension and retraction adjustment of the negative lens body 8.

[0044] The handle body 1 is also provided with symmetrically distributed air pipe interfaces 11. The air pipe interfaces 11 are connected to the reset air injection port 712 and the propulsion air injection port 722 through air pipes respectively. The air pipe interfaces 11 are used to connect to external air pressure control equipment. Gas is input or discharged to the reset air injection port 712 and the propulsion air injection port 722 through air pipes respectively, so as to realize the movement control of the first piston 732 and the second piston 741, thereby adjusting the position of the negative lens body 8.

[0045] During the use of this device, in the imaging infrastructure and light transmission stages: the main body 1 is held by the doctor for operation, the external endoscope tube 2 works with the internal endoscope tube 21 to protect the internal endoscope tube 21 and various optical components, and provides a stable mounting carrier for the objective lens body 22 and the anti-detachment filter module 5. The two sets of objective lens bodies 22 work together to transmit imaging light. In the optical module 4, the light cone 41 is responsible for transmitting the excitation light and imaging light, realizing the convergence and efficient utilization of light. The excitation filter 411 filters stray light in the excitation light to ensure the purity of the excitation light. At the same time, the illumination fiber 412 transmits illumination light. The illumination light path in the external endoscope tube 2 ensures that the observation area of ​​the internal cavity receives sufficient and uniform illumination, laying the foundation for clear imaging in the future.

[0046] Secondly, during the assembly stage, the anti-detachment filter module 5 can be used to securely limit the position of the emission filter 6. The emission filter 6 is precisely positioned by the stepped groove 511 opened in the first lens sleeve 51. The elastic pressure ring 5111 fitted in the stepped groove 511 provides elastic cushioning, and the emission filter 6 is tightly fixed by tightening the threaded locking ring 53 and squeezing the elastic pressure ring 5111. This effectively alleviates the problems of aging and displacement caused by traditional single adhesive fixation. At the same time, the symmetrical docking blocks 512 on the first lens sleeve 51 and the docking slots 541 on the second lens sleeve 54 are connected. The positioning process achieves precise docking between the first lens sleeve 51 and the second lens sleeve 54. By aligning the pin hole 531 on the locking screw ring 53 with the docking slot 541, and with the pins passing through the docking block 512, docking slot 541, and pin hole 531 in sequence, the locking screw ring 53, the first lens sleeve 51, and the second lens sleeve 54 are fixed together as one unit. This further improves the overall structural stability of the anti-detachment filter module 5 and meets the structural reliability requirements after repeated high-temperature and high-pressure sterilization. At the same time, the emission filter 6 accurately separates near-infrared fluorescence signals and stray light, ensuring the purity of the imaging signal.

[0047] Furthermore, during the optical imaging stage, the first light-shielding tube 52 and the second light-shielding tube 55 work together to block stray light outside the imaging optical path. The light-shielding ring grooves 56 inside both tubes can increase the contact area of ​​stray light, and the grooves are coated with an ultra-black light-absorbing coating, which can efficiently absorb stray light and reduce the impact of stray light reflection on the filtering effect of the emission filter 6. At the same time, the inner diameter of the light-shielding ring grooves 56 on the first lens sleeve 51 and the light-shielding ring grooves 56 on the second light-shielding tube 55 are both designed with progressively smaller diameters. This stepped light-shielding structure can block stray light at different angles in layers, preventing stray light from propagating along the optical path to the emission filter 6 and the objective lens body 22, further optimizing the light-shielding effect, reducing optical path loss, and improving imaging clarity and signal-to-noise ratio.

[0048] Then, the focal length can be flexibly adjusted to suit the needs of the procedure. This can be achieved through the imaging adjustment module 7, eliminating the need for frequent endoscope movement by the doctor. During this process, the guide sleeve 71 serves as the base mounting carrier, and a sealing ring 711 outside the guide sleeve 71 seals the gap between them, preventing steam infiltration during high-temperature, high-pressure sterilization. The illumination fiber 412, passing through the fiber optic hole 7111 on the sealing ring 711, is offset from the negative lens body 8, avoiding interference between the illumination fiber 412 and the imaging light. Symmetrically distributed tracheal interfaces 11 on the handle body 1 are connected to the reset air inlet 712 and the advance air inlet 722 via trachea, respectively, for connecting to external air pressure control equipment. By inputting or venting gas, the first piston 732 and the second piston 741 are moved. The first piston 732 cooperates with the advance piston chamber 721 and the reset piston chamber 713. The guide shaft cylinder 73 is driven to slide axially along the guide sleeve 71 through the air pressure difference, thereby realizing the coarse adjustment of the negative lens body 8. The lens cylinder 74, which is axially connected to the guide shaft cylinder 73, changes the position of the second piston 741 in the lens cylinder piston chamber 731 and the advance piston chamber 721 through the air pressure difference. By moving the second piston 741 in the lens cylinder piston chamber 731, the lens cylinder 74 can be finely adjusted, thereby realizing the precise extension and retraction adjustment of the negative lens body 8, meeting the varying working distances during surgery, and ensuring clear imaging at different depths and angles.

[0049] During this process, the objective lens body 22 receives fluorescence and visible light signals from the tissue inside the body. After the anti-detachment filter module 5 filters out stray light, the light is transmitted to the eyepiece module 3. The eyepiece body 31 amplifies the imaging light transmitted by the objective lens body 22. The eyepiece cover 32 fits the doctor's eye, reducing external light interference and improving observation comfort. The eyepiece window 33 uses a transparent protective material to effectively protect the optical surface of the eyepiece body 31, preventing dust, liquid and other contaminants from adhering, ensuring the long-term stable operation of the eyepiece body 31, and ensuring that the doctor can clearly observe the details of the tissue inside the body, providing an accurate basis for clinical diagnosis and treatment.

[0050] All electrical components mentioned in the text are electrically connected to the main controller and power supply. The main controller can be a conventional known device such as a computer that performs control functions, and the existing publicly available power connection technologies will not be elaborated in the text.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A novel near-infrared fluorescence endoscope optical imaging assembly, characterized in that: Includes a handle body (1), on which an external lens tube (2) is fixedly installed. The handle body (1) is also provided with an eyepiece module (3) for eyepiece imaging and an optical module (4) for optical imaging. The external lens tube (2) is also provided with an emission filter (6) that is fixed by an anti-detachment filter module (5). The end of the external lens tube (2) away from the handle body (1) is also provided with a negative lens body (8) that is telescopically adjustable by an imaging adjustment module (7). The outer endoscope tube (2) is fitted with an inner endoscope tube (21) distributed along the axial direction of the outer endoscope tube (2). The inner endoscope tube (21) contains an objective lens body (22) for objective lens imaging, and the anti-detachment filter module (5) is located between the two objective lens bodies (22). The anti-detachment filter module (5) includes a first lens sleeve (51) and a first light shield (52) that are gap-fitted with the endoscope tube (21). The first lens sleeve (51) has a stepped groove (511) adapted to the emission filter (6). An elastic pressure ring (5111) is also fitted in the stepped groove (511). One end of the first lens sleeve (51) is threadedly connected to a locking screw ring (53). The two ends of the elastic pressure ring (5111) are respectively abutted and connected to the emission filter (6) and the locking screw ring (53).

2. The novel near-infrared fluorescence endoscope optical imaging assembly according to claim 1, characterized in that: The first lens sleeve (51) is provided with symmetrically distributed docking blocks (512). The end of the first lens sleeve (51) away from the first light shield (52) is provided with a second lens sleeve (54) that is in clearance fit with the locking screw ring (53). The second lens sleeve (54) is provided with a docking groove (541) that is adapted to the docking block (512), and the locking screw ring (53) is provided with a pin hole (531) that corresponds to the docking groove (541). The locking screw ring (53) is fixedly installed between the first lens sleeve (51) and the second lens sleeve (54) by passing through the docking block (512), the docking groove (541) and the pin hole (531) in sequence by a pin.

3. The novel near-infrared fluorescence endoscope optical imaging assembly according to claim 2, characterized in that: The second lens cover (54) is fixedly installed with a second light shield tube (55) at the end away from the first lens cover (51). Both the second light shield tube (55) and the first light shield tube (52) are provided with light shielding ring grooves (56) for absorbing stray light. The light shielding ring grooves (56) are set in accordance with the imaging optical path in the endoscope tube (21). The light shielding ring grooves (56) are coated with an ultra-black light-absorbing coating.

4. The novel near-infrared fluorescence endoscope optical imaging assembly according to claim 3, characterized in that: The inner diameter of the light-shielding ring groove (56) on the first lens cover (51) facing the emission filter (6) is gradually reduced, and the inner diameter of the light-shielding ring groove (56) on the second light-shielding tube (55) away from the emission filter (6) is gradually reduced.

5. The novel near-infrared fluorescence endoscope optical imaging assembly according to claim 1, characterized in that: The eyepiece module (3) includes an eyepiece body (31) fixedly installed in the handle body (1). An eyepiece cover (32) is fixedly installed on the end of the eyepiece body (31) away from the outer tube (2) and on the handle body (1). An eyepiece window (33) for protecting the eyepiece body (31) is provided at the end of the eyepiece cover (32) near the eyepiece body (31).

6. The novel near-infrared fluorescence endoscope optical imaging assembly according to claim 1, characterized in that: The optical module (4) includes a light cone (41) fixedly mounted on the handle body (1). The light cone (41) extends to one end of the imaging optical path in the handle body (1) and is provided with an excitation filter (411). The light cone (41) is also provided with an illuminance fiber (412) for optical illumination, and the illumination optical path in the external lens tube (2) is distributed along the axial direction of the illuminance fiber (412).

7. The novel near-infrared fluorescence endoscope optical imaging assembly according to claim 1, characterized in that: The imaging adjustment module (7) includes a guide sleeve (71), and the guide sleeve (71) is fitted with a sealing rubber ring (711) that is gap-fitted with the objective lens body (22). The sealing rubber ring (711) is also provided with a fiber hole (7111) corresponding to the illumination fiber (412). The fiber hole (7111) is eccentrically set with the negative lens body (8). The guide sleeve (71) is also slidably connected to the guide shaft sleeve (73) along its axial direction. The guide sleeve (71) is provided with a reset air injection port (712). The guide sleeve (71) is provided with a reset piston chamber (713) that communicates with the reset air injection port (712). The end of the guide sleeve (71) away from the negative lens body (8) is fixedly installed with an end head (72). The end head (72) is provided with a thrust piston chamber (721). The end head (72) is provided with a thrust air injection port (722) that communicates with the thrust piston chamber (721).

8. The novel near-infrared fluorescence endoscope optical imaging assembly according to claim 7, characterized in that: The guide shaft cylinder (73) is fixedly installed at one end of the end (72) with a first piston (732) that is in clearance fit with the thrust piston chamber (721). The thrust piston chamber (721) is separated from the reset piston chamber (713) by the first piston (732). The guide shaft cylinder (73) is slidably connected to a lens cylinder (74) along its axial direction. The negative lens body (8) is fixedly installed at one end of the lens cylinder (74) that protrudes from the guide shaft cylinder (73). The guide shaft cylinder (73) has a lens cylinder piston chamber (731) that communicates with the thrust piston chamber (721). The lens cylinder (74) is fixedly installed at one end of the guide shaft cylinder (73) with a second piston (741) that is in clearance fit with the lens cylinder piston chamber (731). The lens cylinder piston chamber (731) is separated from the thrust piston chamber (721) by the second piston (741).

9. The novel near-infrared fluorescence endoscope optical imaging assembly according to claim 1, characterized in that: The handle body (1) is also provided with symmetrically distributed air pipe interfaces (11), which are connected to the reset air injection port (712) and the propulsion air injection port (722) respectively through air pipes.

Images