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WO2019198350A1 - Endoscope chirurgical - Google Patents

Endoscope chirurgical Download PDF

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Publication number
WO2019198350A1
WO2019198350A1 PCT/JP2019/006706 JP2019006706W WO2019198350A1 WO 2019198350 A1 WO2019198350 A1 WO 2019198350A1 JP 2019006706 W JP2019006706 W JP 2019006706W WO 2019198350 A1 WO2019198350 A1 WO 2019198350A1
Authority
WO
WIPO (PCT)
Prior art keywords
flat glass
objective optical
maximum length
conditional expression
longitudinal direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/006706
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English (en)
Japanese (ja)
Inventor
さや歌 西村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Corp filed Critical Olympus Corp
Publication of WO2019198350A1 publication Critical patent/WO2019198350A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/313—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for introducing through surgical openings, e.g. laparoscopes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes

Definitions

  • the present invention relates to a surgical endoscope.
  • a stereoscopic endoscope that observes a stereoscopic image of an object using two objective optical systems is used (see, for example, Patent Documents 1 and 2).
  • a front lens shared by the two objective optical systems is disposed on the distal end surface of the stereoscopic endoscopes of Patent Documents 1 and 2.
  • a stereoscopic endoscope for surgical laparoscopic surgery requires high image quality and a wide field of view.
  • the diameter of the frontmost lens on the most object side of the objective optical system is large.
  • the two objective optical systems are close to each other. Such a design that satisfies all of the high image quality, wide field of view and small diameter is difficult. That is, the frame that holds the two tip lenses may interfere with each other.
  • the viewing angle of the objective optical system is enlarged, the light rays incident on the two objective optical systems may overlap each other.
  • the frame of the tip lens is located at the portion where the light beams overlap, and the frame obstructs the field of view.
  • one objective lens is shared by two objective optical systems as described in Patent Documents 1 and 2. It is done.
  • endoscopes for surgical laparoscopic surgery need to be sterilized at high temperature and high pressure.
  • the tip lens is soldered to the frame.
  • the solder when the solder is cooled and hardened, the solder contracts, so that stress is generated in the tip lens. Therefore, the distal lens of the surgical endoscope is required to have high rigidity capable of withstanding stress.
  • the endoscopes of Patent Documents 1 and 2 are not for surgical use, and do not consider the rigidity of the tip lens necessary for solder joining.
  • the present invention has been made in view of the above-described circumstances, and in a stereoscopic surgical endoscope having two objective optical systems, it is possible to simultaneously achieve high image quality, a wide field of view, and a reduction in diameter.
  • a surgical endoscope that is durable and resistant to solder joints.
  • One aspect of the present invention is a long insertion portion that is inserted into the body, two objective optical systems that are disposed in the distal end portion of the insertion portion and have parallax with each other, and a distal end surface of the insertion portion.
  • a single flat glass covering the object side of the two objective optical systems, the object side surface and the image side surface of the flat glass are flat, and the flat glass has a Young's modulus of 335,000 MPa or more.
  • the outer surface of the flat glass is covered with a metal film, and is fixed to the distal end surface of the insertion portion with solder.
  • FIG. 3 is a longitudinal sectional view taken along line II in FIG. 2 and shows an internal structure of the insertion portion. It is a figure explaining the chamfering amount of the corner
  • the surgical endoscope 1 As shown in FIGS. 1 to 3, the surgical endoscope 1 according to the present embodiment is disposed inside a long insertion portion 2 to be inserted into the body and a distal end portion 2 a of the insertion portion 2.
  • Two objective optical systems 31, 32, a single flat glass 4 and two illumination lenses 5 arranged on the distal end surface 2 b of the insertion portion 2 are provided.
  • the surgical endoscope 1 is sterilized at high temperature and high pressure before being used for a surgical operation.
  • the flat glass 4 and the illumination lens 5 are fixed to the front end surface 2b by soldering.
  • the insertion portion 2 has a horizontal direction and a vertical direction.
  • the left-right direction and the up-down direction are orthogonal to the longitudinal axis of the insertion portion 2 and are orthogonal to each other.
  • the distal end portion 2a of the insertion portion 2 is a distal end hard portion.
  • the distal end hard portion 2a includes a cylindrical tube frame 6 and a disk-shaped tip frame 7 that closes the opening on the distal end side of the tube frame 6 and forms the distal end surface 2b.
  • the cylinder frame 6 and the front end frame 7 are formed of a hard metal material.
  • first opening 7 a in which the flat glass 4 is disposed and an opening (second opening) 7 b in which the illumination lens 5 is disposed are formed in the front end frame 7.
  • Each objective optical system 31, 32 is composed of a plurality of lenses as shown in FIG.
  • the two objective optical systems 31 and 32 have parallax in the left-right direction. That is, the two objective optical systems 31 and 32 are arranged in the left-right direction, and the optical axes A1 and A2 of the two objective optical systems 31 and 32 are arranged at intervals in the left-right direction.
  • the optical axes A1 and A2 are parallel to each other.
  • the image acquired by the image sensor 81 and the image acquired by the image sensor 82 are images in which an object is viewed from two viewpoints corresponding to a human left eye and right eye. A stereoscopic image of the object can be constructed from such a pair of images.
  • the flat glass 4 is made of sapphire glass having a Young's modulus of 335,000 MPa or more. As shown in FIGS. 2 and 3, the flat glass 4 includes an object side surface 4a and an image side surface 4b that face each other in the direction along the optical axes A1 and A2 and are orthogonal to the optical axes A1 and A2, and an object side surface 4a And an annular outer peripheral surface 4c connecting the image side surface 4b.
  • the object side surface 4a and the image side surface 4b are flat and parallel to each other.
  • the object side surface 4a and the image side surface 4b are oval having a longitudinal direction and a short direction perpendicular to each other.
  • the object side surface 4a and the image side surface 4b are two long sides that are linear and opposite each other in the short direction and two short sides that are arcuate and opposite each other in the longitudinal direction. It has the shape which consists of.
  • the longitudinal direction is parallel to the left-right direction of the insertion portion 2, and the short side direction is parallel to the vertical direction of the insertion portion 2.
  • the maximum length X in the longitudinal direction of the object side surface 4a and the image side surface 4b is larger than the maximum length Y in the short direction of the object side surface 4a and the image side surface 4b.
  • Such flat glass 4 is manufactured, for example, by so-called D-cut processing in which both sides of a circular flat plate are cut off.
  • the flat glass 4 covers the object side of the two objective optical systems 31 and 32. That is, the two long sides of the flat glass 4 are arranged outside the two objective optical systems 31 and 32 in the vertical direction, and the two short sides of the flat glass 4 are two objective optical systems 31 and 32 in the horizontal direction. 32 is arranged on the outer side.
  • the center of the flat glass 4 in the longitudinal direction coincides with the center between the optical axes A1 and A2 of the two objective optical systems 31 and 32.
  • the outer peripheral surface 4 c of the flat glass 4 is covered with a metal film in order to enable solder bonding between the flat glass 4 and the tip frame 7.
  • the outer peripheral surface 4 c of the flat glass 4 and the inner peripheral surface of the opening 7 a are fixed to each other by the solder S.
  • the flat glass 4 is disposed in the opening 7a, the solder S is poured between the inner peripheral surface of the opening 7a and the outer peripheral surface 4c of the flat glass 4, and the solder S is cooled. Harden. At this time, the solder S contracts during the cooling process, so that a compressive force is applied to the flat glass 4 and a stress is generated in the flat glass 4.
  • the illumination lens 5 emits illumination light from an illumination optical system (not shown) in the cylindrical frame 6 toward the object.
  • the illumination lens 5 is disposed on the upper side of the flat glass 4.
  • the outer peripheral surface of the illumination lens 5 is covered with a metal film in order to enable solder joining between the illumination lens 5 and the tip frame 7.
  • the outer peripheral surface of the illumination lens 5 and the inner peripheral surface of the opening 7b are fixed to each other by solder S.
  • the gap G between the opening 7a and the opening 7b is preferably 0.2 mm or more. Thereby, it is possible to prevent the solder in the opening 7a from flowing into the opening 7b or the solder in the opening 7b from flowing into the opening 7a during solder bonding.
  • the flat glass 4 has a shape that satisfies the following conditional expressions (1), (2), (3), and (4).
  • X is the maximum length (mm) of the flat glass 4 in the longitudinal direction.
  • Y is the maximum length (mm) of the flat glass 4 in the short direction.
  • EN is the length (mm) in the direction along the optical axes A1 and A2 from the object side surface 4a of the flat glass 4 to the entrance pupil position of the objective optical systems 31 and 32.
  • D is the distance (mm) between the optical axes A1 and A2 of the two objective optical systems 31 and 32.
  • ⁇ is the half angle of view (deg) of each objective optical system 31, 32.
  • T is the thickness (mm) of the flat glass 4, that is, the distance between the object side surface 4a and the image side surface 4b.
  • Conditional expression (1) defines the positional relationship between the light rays that enter the objective optical systems 31 and 32 and that pass through the outermost side in the longitudinal direction of the flat glass 4 and both ends of the flat glass 4 in the longitudinal direction. ing.
  • both ends in the longitudinal direction of the flat glass 4 are arranged outside the light beam passing through the outermost side. Therefore, it is possible to prevent the occurrence of vignetting caused by the light traveling from the object toward the objective optical systems 31 and 32 being kicked at both ends in the longitudinal direction of the flat glass 4.
  • Conditional expression (2) and conditional expression (3) define the range of the ratio of the maximum length Y to the maximum length X.
  • conditional expression (2) the durability of the flat glass 4 against solder bonding can be improved.
  • Y / X is less than 0.3, the difference between the magnitude of the stress in the longitudinal direction and the magnitude of the stress in the lateral direction, and the difference between the amount of strain in the longitudinal direction and the magnitude of the strain in the lateral direction are It becomes large and the flat glass 4 is easily broken or distorted.
  • conditional expression (3) it is possible to secure a distance between the upper end of the flat glass 4 and the illumination lens 5 and to prevent occurrence of flare due to illumination light emitted from the illumination lens 5.
  • Y / X is larger than 0.5, the upper end of the flat glass 4 and the illumination lens 5 are close to each other, and flare caused by illumination light may occur.
  • Conditional expression (4) defines the range of the ratio of the thickness T to the maximum length X.
  • T / X satisfies the conditional expression (4), resistance of the flat glass 4 to stress can be improved.
  • T / X is larger than 0.069, the stress applied to the end of the flat glass 4 exceeds 580 MPa, and the flat glass 4 is easily broken.
  • T / X is less than 0.017, the flat glass 4 is too thin to be easily broken, and the flat glass 4 is difficult to handle.
  • the insertion portion 2 is inserted into the body, and the subject inside the body is illuminated with illumination light emitted from the illumination lens 5.
  • Each objective optical system 31 and 32 forms an image of a subject illuminated with illumination light
  • each of the image sensors 81 and 82 captures an image of the subject. Since the two objective optical systems 31 and 32 have a field of view in the left-right direction, the two images generated by the image sensors 81 and 82 are images in which the subject is viewed from two viewpoints whose positions are different from each other in the left-right direction. . The subject can be stereoscopically viewed using such two images.
  • the front end lenses 31a and 32a closest to the object side of the objective optical systems 31 and 32 are lenses having a large diameter and a wide angle. Preferably there is.
  • the two objective optical systems 31 and 32 be as close as possible to each other in the left-right direction.
  • the flat glass 4 is disposed on the distal end surface 2b of the insertion portion 2, and the object sides of the two objective optical systems 31 and 32 are covered by the single flat glass 4.
  • the front end frame 7 holding the flat glass 4 interferes between the objective optical systems 31 and 32 or the objective optical systems 31 and 32. It is possible to prevent the visual field from being obstructed. Accordingly, the two tip lenses 31a and 32a having a large diameter can be disposed close to each other, and high image quality, a wide field of view, and a reduction in diameter can be achieved at the same time.
  • the flat glass 4 is made of a highly rigid sapphire glass having a Young's modulus of 335,000 MPa or more. Therefore, the flat glass 4 can withstand the compressive force and stress accompanying the hardening of the solder S. That is, the flat glass 4 has durability against solder bonding. When the shape of the flat glass 4 satisfies the conditional expressions (2) and (4), the durability of the flat glass 4 against solder bonding can be further improved.
  • the outer peripheral surface 4c of the flat glass 4 is a polished surface. More preferably, the entire outer peripheral surface 4c is a polished surface.
  • the arithmetic average roughness Ra of the outer peripheral surface 4c preferably satisfies the following conditional expression (5).
  • the outer peripheral surface 4c is a rough surface, compressive forces in various directions are intensively applied to the convex portions of the outer peripheral surface 4c, and stress is concentrated on the convex portions.
  • the outer peripheral surface 4c is a smooth polished surface, the concentration of compressive force and stress can be eliminated and the durability of the flat glass 4 against solder bonding can be improved.
  • the arithmetic average roughness Ra satisfies the conditional expression (5), the durability of the flat glass 4 against solder bonding can be further improved.
  • the corner between the object side surface 4a and the outer peripheral surface 4c and the corner between the image side surface 4b and the outer peripheral surface 4c are chamfered at least in a part in the circumferential direction. More preferably, the corner is chamfered over the entire circumference.
  • the chamfered surface formed by chamfering is also preferably a polished surface.
  • the chamfering amount M preferably satisfies the following conditional expression (6). 0.0025 ⁇ M / T ⁇ 0.25 (6)
  • the chamfering amount M satisfies the conditional expression (6), chipping and cracking of the edge of the flat glass 4 can be prevented.
  • M / T 0.25 or more
  • the portion B in the figure is sharp, so that when the outer peripheral surface 4c is subjected to metal film processing or solder bonding processing, the flat glass 4 B portion is likely to be chipped.
  • M / T is 0.0025 or less
  • the portion C of the figure is sharp, and thus when the outer peripheral surface 4c is subjected to metal film treatment or solder bonding treatment, the flat glass 4 Chipping of the C portion is likely to occur.
  • the flat glass 4 is oval, but the shape of the flat glass 4 is not limited to this, and may be other shapes such as a rectangle, a polygon, or an ellipse. Also good.
  • the flat glass 4 was formed from the sapphire glass, the flat glass 4 may be formed from the other glass which has a Young's modulus of 335000 Mpa or more.
  • One aspect of the present invention is a long insertion portion that is inserted into the body, two objective optical systems that are disposed in the distal end portion of the insertion portion and have parallax with each other, and a distal end surface of the insertion portion.
  • a single flat glass covering the object side of the two objective optical systems, the object side surface and the image side surface of the flat glass are flat, and the flat glass has a Young's modulus of 335,000 MPa or more.
  • the outer surface of the flat glass is covered with a metal film, and is fixed to the distal end surface of the insertion portion with solder.
  • the two object images formed by the two objective optical systems are planar images obtained by viewing the object from two viewpoints having different positions. Therefore, a stereoscopic image of the object can be observed using the two object images.
  • the flat glass formed from the glass having a Young's modulus of 335,000 MPa or more has high rigidity and can withstand the compressive force and stress accompanying the hardening of the solder. That is, the flat glass has durability against solder bonding.
  • a single flat glass that covers the object side of the two objective optical systems is provided on the distal end surface of the insertion portion, and a frame that holds the flat glass interferes between the two objective optical systems or two objective optical systems. It is possible to prevent the visual field of the system from being obstructed. Thereby, high image quality, a wide field of view and a narrow diameter can be achieved at the same time. That is, two objective optical systems having a large lens diameter of the tip lens can be arranged close to each other.
  • the said flat glass has a longitudinal direction parallel to the sequence direction of two said objective optical systems, and a transversal direction orthogonal to this longitudinal direction,
  • the maximum length of the said longitudinal direction of the said flat glass Is preferably larger than the maximum length of the flat glass in the lateral direction.
  • the shape of the said flat glass satisfy
  • X is the maximum length (mm) in the longitudinal direction
  • EN is the length (mm) from the object side surface of the flat glass to the entrance pupil position of the objective optical system
  • D is the two An interval (mm) between the optical axes of the objective optical system and ⁇ is a half angle of view (deg) of each objective optical system.
  • Conditional expression (1) defines the positional relationship between the light rays that enter the objective optical system and that pass through the outermost side in the longitudinal direction of the flat glass, and both ends in the longitudinal direction of the flat glass.
  • the shape of the said flat glass satisfy
  • X is the maximum length (mm) in the longitudinal direction
  • Y is the maximum length (mm) in the lateral direction.
  • Conditional expression (2) defines the range of the ratio of the maximum length Y to the maximum length X.
  • conditional expression (3) defines the range of the ratio of the maximum length Y to the maximum length X.
  • An illumination lens is often arranged next to the short direction of the flat glass.
  • the shape of the said flat glass satisfy
  • T is the thickness (mm) of the flat glass
  • X is the maximum length (mm) in the longitudinal direction.
  • Conditional expression (4) defines the range of the ratio of the thickness T to the maximum length X. The greater the thickness T, the greater the compressive force applied to the flat glass and the stress generated in the flat glass. On the other hand, the smaller the thickness T is, the more fragile the flat glass is and the more difficult it is to handle the flat glass.
  • the said outer peripheral surface of the said flat glass is a grinding
  • Ra is the arithmetic average roughness ( ⁇ m) of the polished surface. Ra ⁇ 0.06 (5)
  • conditional expression (5) When the outer peripheral surface of the flat glass is rough, the flat glass is easily cracked due to the concentration of compressive force and stress on the convex portions. By satisfying conditional expression (5), the concentration of compressive force and stress can be eliminated, and the durability of the flat glass against solder bonding can be improved.
  • the corner portion between the object side surface and the outer peripheral surface of the flat glass and the corner portion between the image side surface and the outer peripheral surface are chamfered, and the chamfer amount of the corner portion is chamfered.
  • M is the chamfering amount (mm) of the corner
  • T is the thickness (mm) of the flat glass. 0.0025 ⁇ M / T ⁇ 0.25 (6)
  • emits illumination light is provided,

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Surgery (AREA)
  • Optics & Photonics (AREA)
  • Biomedical Technology (AREA)
  • Public Health (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Medical Informatics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Endoscopes (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)

Abstract

L'invention porte sur un endoscope chirurgical qui est pourvu d'une unité d'insertion allongée qui est insérée dans le corps, de deux systèmes optiques d'objectif (31, 32) qui sont agencés dans la pointe de l'unité d'insertion et qui ont une parallaxe l'un par rapport à l'autre, et d'une seule plaque de verre plate (4) qui est agencée sur la surface de la pointe (2b) de l'unité d'insertion et qui recouvre le côté objet des deux systèmes optiques d'objectif (31, 32). La surface côté objet (4a) et la surface côté image (4b) de la plaque de verre plate (4) sont toutes deux plates, la plaque de verre plate (4) est constituée de verre ayant un module de Young supérieur ou égal à 335 000 MPa, la surface périphérique externe (4c) de la plaque de verre plate (4) est recouverte d'un film métallique, et est fixée par soudure (S) à la surface de la pointe (2b).
PCT/JP2019/006706 2018-04-13 2019-02-22 Endoscope chirurgical Ceased WO2019198350A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018077281 2018-04-13
JP2018-077281 2018-04-13

Publications (1)

Publication Number Publication Date
WO2019198350A1 true WO2019198350A1 (fr) 2019-10-17

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PCT/JP2019/006706 Ceased WO2019198350A1 (fr) 2018-04-13 2019-02-22 Endoscope chirurgical

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09265047A (ja) * 1996-03-27 1997-10-07 Matsushita Electric Ind Co Ltd 電子内視鏡装置
JP2000010022A (ja) * 1998-06-19 2000-01-14 Fuji Photo Optical Co Ltd 立体内視鏡の先端構造
JP2004016410A (ja) * 2002-06-14 2004-01-22 Fuji Photo Optical Co Ltd 立体電子内視鏡装置
JP2007143580A (ja) * 2005-11-24 2007-06-14 Olympus Medical Systems Corp 内視鏡装置
US20130102846A1 (en) * 2011-10-21 2013-04-25 Viking Systems, Inc. Steerable electronic stereoscopic endoscope
JP2016160162A (ja) * 2015-03-04 2016-09-05 国立大学法人 東京大学 ガラス材及びその製造方法
US20170172394A1 (en) * 2006-12-21 2017-06-22 Intuitive Surgical Operations, Inc. Endoscope with Distal Hermetically Sealed Sensor
JP2017215586A (ja) * 2016-06-01 2017-12-07 ゼネラル・エレクトリック・カンパニイ 立体画像化システム

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09265047A (ja) * 1996-03-27 1997-10-07 Matsushita Electric Ind Co Ltd 電子内視鏡装置
JP2000010022A (ja) * 1998-06-19 2000-01-14 Fuji Photo Optical Co Ltd 立体内視鏡の先端構造
JP2004016410A (ja) * 2002-06-14 2004-01-22 Fuji Photo Optical Co Ltd 立体電子内視鏡装置
JP2007143580A (ja) * 2005-11-24 2007-06-14 Olympus Medical Systems Corp 内視鏡装置
US20170172394A1 (en) * 2006-12-21 2017-06-22 Intuitive Surgical Operations, Inc. Endoscope with Distal Hermetically Sealed Sensor
US20130102846A1 (en) * 2011-10-21 2013-04-25 Viking Systems, Inc. Steerable electronic stereoscopic endoscope
JP2016160162A (ja) * 2015-03-04 2016-09-05 国立大学法人 東京大学 ガラス材及びその製造方法
JP2017215586A (ja) * 2016-06-01 2017-12-07 ゼネラル・エレクトリック・カンパニイ 立体画像化システム

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