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CN-224206809-U - Near infrared fluorescence endoscope optical imaging lens group with novel design

CN224206809UCN 224206809 UCN224206809 UCN 224206809UCN-224206809-U

Abstract

The utility model belongs to the technical field of optical imaging, and particularly relates to a novel designed near infrared fluorescence endoscope optical imaging lens group, which comprises a handle main body, wherein an outer lens tube is fixedly arranged on the handle main body, an eyepiece module for eyepiece imaging and an optical module for optical imaging are also respectively arranged on the handle main body, an emission filter which is limited and fixed through an anti-drop filter module is also arranged in the outer lens tube, one end of the outer lens tube, which is far away from the handle main body, is also provided with a negative lens main body which is telescopically regulated through an imaging regulating module, the anti-drop filter module comprises a first lens sleeve and a first shading cylinder, a step groove is formed in the first lens sleeve, an elastic compression ring is also sleeved in the step groove, and one end of the first lens sleeve is in threaded fit connection with a locking spiral ring. The optical imaging lens group of the near infrared fluorescence endoscope with the novel design realizes the accurate positioning and the tight fixation of the emission filter through the cooperation of the first lens sleeve, the step groove, the elastic compression ring, the locking spiral ring and the second lens sleeve of the anti-drop filter module.

Inventors

  • ZHANG YUEYING

Assignees

  • 上海理工大学

Dates

Publication Date
20260508
Application Date
20260408

Claims (9)

  1. 1. The novel designed near infrared fluorescence endoscope optical imaging lens group is characterized by comprising a handle main body (1), wherein an outer lens tube (2) is fixedly arranged on the handle main body (1), an eyepiece module (3) for eyepiece imaging and an optical module (4) for optical imaging are further arranged on the handle main body (1), an emission filter (6) which is limited and fixed through an anti-drop filter module (5) is further arranged in the outer lens tube (2), and a negative lens main body (8) which is telescopically regulated through an imaging regulating module (7) is further arranged at one end of the outer lens tube (2) far away from the handle main body (1); An inner lens tube (21) which is axially distributed along the outer lens tube (2) is sleeved in the outer lens tube (2), objective lens bodies (22) for objective lens imaging are arranged and distributed in the inner lens tube (21), and the anti-drop optical filtering module (5) is positioned between the two groups of objective lens bodies (22); The anti-drop optical filtering module (5) comprises a first mirror sleeve (51) and a first shading barrel (52) which are in clearance fit with the endoscope tube (21), a step groove (511) which is matched with the emission optical filter (6) is formed in the first mirror sleeve (51), an elastic compression ring (5111) is further sleeved in the step groove (511), one end of the first mirror sleeve (51) is connected with a locking spiral ring (53) in a threaded fit manner, and two ends of the elastic compression ring (5111) are respectively connected with the emission optical filter (6) and the locking spiral ring (53) in a butt mode.
  2. 2. The novel near infrared fluorescence endoscope optical imaging lens group of design according to claim 1, wherein symmetrically distributed butt joint blocks (512) are arranged on the first lens sleeve (51), a second lens sleeve (54) in clearance fit with the locking spiral ring (53) is arranged at one end, far away from the first shading cylinder (52), of the first lens sleeve (51), a butt joint clamping groove (541) matched with the butt joint blocks (512) is formed in the second lens sleeve (54), a pin shaft hole (531) corresponding to the butt joint clamping groove (541) is formed in the locking spiral ring (53), and the locking spiral ring (53) sequentially penetrates through the butt joint blocks (512) and the butt joint clamping grooves (541) through pins and is fixedly arranged between the first lens sleeve (51) and the second lens sleeve (54).
  3. 3. The optical imaging lens set of the near infrared fluorescence endoscope with the novel design as set forth in claim 2, wherein a second shading cylinder (55) is fixedly arranged at one end, far away from the first lens sleeve (51), of the second lens sleeve (54), shading ring grooves (56) for absorbing stray light are formed in the second shading cylinder (55) and the first shading cylinder (52), the shading ring grooves (56) are arranged corresponding to imaging light paths in the endoscope tube (21), and ultra-black light absorption coatings are coated in the shading ring grooves (56).
  4. 4. The optical imaging lens set of the near infrared fluorescence endoscope of novel design as set forth in claim 3, wherein the inner diameter of the shading ring groove (56) on the first lens sleeve (51) towards one side of the emission filter (6) is gradually reduced, and the inner diameter of the shading ring groove (56) on the second shading cylinder (55) away from one side of the emission filter (6) is gradually reduced.
  5. 5. The optical imaging lens set of the near infrared fluorescence endoscope with the novel design according to claim 1, wherein the eyepiece module (3) comprises an eyepiece body (31) fixedly installed in the handle body (1), an eyepiece cover (32) is fixedly installed on one end, far away from the outer lens tube (2), of the eyepiece body (31) and positioned on the handle body (1), and an eyepiece window (33) used for protecting the eyepiece body (31) is arranged on one end, close to the eyepiece body (31), of the eyepiece cover (32).
  6. 6. The optical imaging lens set of the near infrared fluorescence endoscope with the novel design as claimed in claim 1, wherein the optical module (4) comprises a light cone (41) fixedly installed on the handle main body (1), an excitation filter (411) is arranged at one end of an imaging light path extending to the handle main body (1), an illumination optical fiber (412) for optical illumination is further arranged on the light cone (41), and the illumination light paths in the outer lens tube (2) are axially distributed along the illumination optical fiber (412).
  7. 7. The novel near infrared fluorescence endoscope optical imaging lens group according to claim 1, wherein the imaging adjusting module (7) comprises a guide sleeve (71), a sealing rubber ring (711) in clearance fit with the objective main body (22) is sleeved outside the guide sleeve (71), an optical fiber hole (7111) corresponding to an illumination optical fiber (412) is further formed in the sealing rubber ring (711), and the optical fiber hole (7111) and the negative lens main body (8) are eccentrically arranged; The guide sleeve (71) is further connected with the guide shaft cylinder (73) in a sliding mode along the axial direction of the guide sleeve, a reset air injection port (712) is formed in the guide sleeve (71), a reset piston cavity (713) communicated with the reset air injection port (712) is formed in the guide sleeve (71), an end head (72) is fixedly arranged at one end, far away from the negative lens main body (8), of the guide sleeve (71), a propelling piston cavity (721) is formed in the end head (72), and a propelling air injection port (722) communicated with the propelling piston cavity (721) is formed in the end head (72).
  8. 8. The optical imaging lens group of the near infrared fluorescence endoscope with the novel design according to claim 7, wherein a first piston (732) in clearance fit with a pushing piston cavity (721) is fixedly arranged at one end of the guiding shaft cylinder (73) in the end head (72), the pushing piston cavity (721) is separated from the resetting piston cavity (713) through the first piston (732), the guiding shaft cylinder (73) is connected with a lens cylinder (74) in a sliding manner along the axial direction of the guiding shaft cylinder, the negative lens main body (8) is fixedly arranged at one end of the lens cylinder (74) protruding out of the guiding shaft cylinder (73), a piston cavity (731) communicated with the pushing piston cavity (721) is formed in the guiding shaft cylinder (73), a second piston (741) in clearance fit with the pushing piston cavity (721) is fixedly arranged at one end of the guiding shaft cylinder (73), and the pushing piston cavity (731) is separated from the pushing piston cavity (721) through the second piston (741).
  9. 9. The optical imaging lens set of the near infrared fluorescence endoscope with the novel design as claimed in claim 1, wherein the handle main body (1) is further provided with symmetrically distributed air pipe interfaces (11), and the air pipe interfaces (11) are respectively communicated with the reset air injection port (712) and the pushing air injection port (722) through air pipes.

Description

Near infrared fluorescence endoscope optical imaging lens group with novel design Technical Field The utility model relates to the technical field of optical imaging, in particular to a novel designed optical imaging lens group of a near infrared fluorescence endoscope. Background The infrared fluorescence endoscope is medical minimally invasive diagnosis and treatment equipment which integrates a near infrared fluorescence imaging technology and a traditional endoscope technology, the working wave band of the medical minimally invasive diagnosis and treatment equipment is usually expanded to a visible-near infrared light wave band (about 400-900 nm), fluorescence imaging of in-vivo tissues can be realized by combining a fluorescent agent (such as indocyanine green and the like), standard white light imaging can be compatible, by means of stronger tissue penetrability of near infrared light and lower biological autofluorescence interference advantages, key anatomical structures, tumor boundaries and lymph nodes which are difficult to observe under white light can be clearly displayed, an important role is played in early diagnosis, navigation in operation and postoperative evaluation of diseases such as gastrointestinal tumors, safety and accuracy of minimally invasive surgery are remarkably improved, and the infrared fluorescence endoscope becomes one of important tools in the modern minimally invasive diagnosis and treatment field. The optical imaging lens group is used as a core component of the near infrared fluorescence endoscope, bears the functions of receiving, transmitting and imaging fluorescent signals and visible light signals, and the performance of the optical imaging lens group directly determines the imaging definition, signal to noise ratio and diagnosis and treatment reliability of the endoscope. The optical filter is used as a key optical element in the optical imaging lens group and is used for separating near infrared fluorescent signals, excitation light and stray light, the installation accuracy and stability of the optical filter directly influence the filtering effect, and further the imaging quality is determined, the thickness of a film layer of the optical filter needs to be controlled at a nanometer level, and any small deviation can lead to center wavelength drift and directly influence the diagnosis accuracy. Meanwhile, as the medical endoscope needs to directly enter the human body cavity, the medical endoscope needs to be sterilized at high temperature and high pressure after being used to avoid cross infection. The existing optical filter is usually fixed in a traditional gluing mode, but in the repeated high-temperature and high-pressure sterilization process, the adhesive can age and soften due to temperature change, so that the connection strength between the optical filter and a lens group base is reduced, further optical filter displacement and inclination occur, the negative lens of the existing near infrared fluorescent endoscope is mostly fixedly designed, the focal length parameter of the negative lens is fixedly set when leaving a factory, the working distance of the endoscope can be continuously changed along with operation and cavity channel position change due to complex and changeable operation scene, a doctor is required to frequently move the whole endoscope back and forth, and a patient is easy to generate discomfort. Disclosure of utility model The present inventors have conducted intensive studies to overcome the above-mentioned drawbacks of the prior art, and have completed the present utility model after a great deal of creative effort. Specifically, the utility model aims to solve the technical problems that the optical imaging lens set of the near infrared fluorescence endoscope is provided with a novel design, so that the technical problems that the current optical filter is fixed by gluing in the traditional method, the optical filter is inclined due to ageing and softening of the gluing agent after repeated high-temperature and high-pressure sterilization, and the negative lens is fixed in design and focal length, and a doctor is required to frequently move the endoscope, so that a patient is uncomfortable are solved. In order to solve the technical problems, the utility model provides the following technical scheme: The novel designed near infrared fluorescence endoscope optical imaging lens group comprises a handle main body, wherein an outer lens tube is fixedly arranged on the handle main body, an eyepiece module for eyepiece imaging and an optical module for optical imaging are further arranged on the handle main body respectively, an emission filter which is fixed through limiting of an anti-drop filter module is further arranged in the outer lens tube, and a negative lens main body which is adjusted through telescopic adjustment of an imaging adjusting module is further arranged at one end of the outer lens tube far away from the handle main