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
  • A61B1/00064—Constructional details of the endoscope body
  • A61B1/00071—Insertion part of the endoscope body
  • A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
  • A61B1/00096—Optical elements
• • 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
  • A61B1/00064—Constructional details of the endoscope body
  • A61B1/0011—Manufacturing of endoscope parts
• • 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
  • A61B1/00112—Connection or coupling means
  • A61B1/00121—Connectors, fasteners and adapters, e.g. on the endoscope handle
  • A61B1/00128—Connectors, fasteners and adapters, e.g. on the endoscope handle mechanical, e.g. for tubes or pipes
• • 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
  • G02B23/2407—Optical details
  • G02B23/2423—Optical details of the distal end
  • G02B23/243—Objectives for endoscopes
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
  • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
  • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens

Definitions

• Imaging unit for a surgical instrument and method for making an imaging unit
• the invention relates to an imaging unit for a surgical instrument, in particular endoscope. Moreover, the invention relates to a surgical instrument, in particular endoscope. Furthermore, the invention also relates to a method for producing an imaging unit for a surgical instrument, in particular an endoscope.
• optical components used in surgical instruments, for example in endoscopes, are constantly increasing. So far, it is sufficient to polish the optical components and adjust their outer diameter with a relatively large tolerance.
• the optical components are arranged in a system tube, for example in a lens tube. There is a clearance fit between the optical elements and the system tube. Towards an optical Axis of the system are located between the optical elements so-called. Blend tubes, which fix the optical components spaced apart in the system tube.
• the provided clearance allows a certain play of the individual optical components in the radial direction of the system pipe.
• the optical components may shift slightly axially or tilt with respect to the optical axis of the system. Such deviations from the ideal jus- tage can have a negative effect on the image quality of the optical system.
• the objective is focused by transversal displacement, that is to say by a displacement along its optical axis, relative to a plane in which a sharp image is desired and in which, for example, an image sensor is located.
• the lens such as the endoscope objective, permanently fixed by this z. B. is glued.
• cylindrical fits are used to align the optical components. Despite small tolerances in the fit, it is possible for the optical element or optical unit to tilt slightly.
• DE 1 0 201 5 205 457 A1 discloses an imaging unit for an endoscope.
• an imaging unit for a surgical instrument in particular an endoscope
• an optical element in particular an optical lens
• the optical element is accommodated in a lens tube
• the optical element in the objective tube is further developed by a) the optical element in the objective tube b) the optical element is received in a socket and the socket of the optical element in the objective tube is clamped gap-free and / or that the optical element is received in a centered socket.
• the invention is based on the idea that after insertion of the socket with the optical element, in particular optical lens, the socket is held in the objective tube by a tension between the socket and the lens barrel and is aligned, wherein due to the tension of the socket in the objective tube the socket is arranged without gaps in the objective tube, whereby the optical lens is or is aligned as an optical element without tilting to the optical axis in the objective tube.
• the optical element is in one centered socket, so that the socket for the lens as an optical element has an exact outside diameter and the optical axis of the lens is collinearly aligned with the mechanical axis of the socket, i. e. lying one above the other.
• the socket is replaced with a e.g. Glued lens is clamped in a Justierfutter so that then the position of the optical axis of the lens to the spindle axis is detected and measured.
• the adjustment lens then aligns the lens with the holder so that its two centers of curvature lie as precisely as possible on the axis of rotation of the spindle.
• the alignment spindle is rotated and the outer surface of the e.g. made of stainless steel, e.g. worked with a turning tool. This results in a precisely machined surface of the socket, which is aligned parallel to the spindle axis.
• a centered socket with a lens is formed or provided.
• the lens is processed in the socket prior to machining. fixed by means of low-stress adhesives.
• the arranged in the version lenses are crimped or held by screw rings.
• the, preferably centered, socket has an exact diameter which is smaller than the diameter of the objective tube during insertion or insertion of the socket.
• the inner diameter of the objective tube is narrowed, so that the socket is clamped or becomes free of gaps due to the (inner) diameter constriction of the objective tube.
• the objective tube is made of stainless steel and formed prior to insertion of the centered socket with a running in the longitudinal direction of the lens barrel gap, wherein the inner diameter of the objective tube is greater than the outer diameter of the socket.
• the gap is at least partially, for example by welding or a weld, closed, whereby the inner diameter of the objective tube is reduced and thus the socket is clamped in the objective tube.
• the optical element is held and aligned without a holder after introduction of the optical element, in particular optical lens, by a direct tension between the optical element and the objective tube, wherein due to the distortion of the optical element in the objective tube without interposition of a socket for the optical element, the optical element, in particular lens, is arranged gap-free in the objective tube, whereby the optical lens is aligned as an optical element without tilting to the optical axis in the objective tube or is.
• the objective tube in the region of the optical element has an opening, wherein in particular in the arrangement of the optical element in the objective tube in the region of the aperture, the optical element with an inner circumferential surface of the objective tube facing the optical element is, is not brought into contact or can be brought, or that the objective tube in the region of the optical element and / or in the region of the socket has an opening, wherein in particular when the socket is arranged with the optical element in the objective tube in the rich of the aperture the socket of the optical element with an inner circumferential surface of the objective tube, which faces the socket with the optical element, is not brought into contact or can be brought.
• the inner diameter of the objective tube is preferably at least equal to or smaller than the outer diameter of the centered socket, so that the socket is clamped gap-free.
• the opening in the objective tube is formed as a gap or slit, wherein in particular the gap or the slit extends in the longitudinal direction of the objective tube relative to the longitudinal extent of the objective tube.
• the gap or slot is in one embodiment using a laser, e.g. Nd-YAG laser, cut into the lens tube made of stainless steel.
• the gap or slit may be formed by an erosion process or the like in the objective tube.
• the width of the gap or slot is between 30 to 100 ⁇ .
• the imaging unit is further distinguished by the fact that the opening in the objective tube for the optical element is formed with respect to the longitudinal extent of the objective tube between two slit connection areas of the objective tube.
• At least one of the two sliding connection areas is in each case designed as a welded seam.
• the gap in the objective tube by a, preferably pulsed laser, eg Nd-YAG laser, up to the aperture after insertion of the centered version welded into the objective tube and thereby partially closed, wherein the inner diameter of the objective tube is narrowed or reduced during welding of the gap.
• the weld is interrupted by the opening in the region of the socket, it is possible to introduce or give in the opening adhesives, thereby in the arrangement of the objective tube in a sleeve tube for the lens tube, arranged in the sleeve tube lens tube with the sleeve tube to stick together.
• the sleeve tube is connected to an image sensor, e.g. CMOS chip, formed on a head side and as a guide tube for the objective tube.
• the sleeve tube is arranged in an endoscope shaft of an endoscope so that images are captured by the image sensor and displayed on a monitor or the like.
• the weld or the welds are formed by laser welding.
• an imaging unit for a surgical instrument in particular endoscope, with a two-head end sleeve tube for receiving a at least one optical element, in particular optical lens, receiving objective tube, which is further developed in that the head ends of the sleeve tube are formed tubular and the two head ends of the sleeve tube are interconnected by means of at least one, in particular bendable, connecting web.
• the sleeve tube is preferably at a head end or in the area with an image sensor, such as CMOS-Ch ip, CCD chip or the like, provided to the transferred images of an optics capture .
• an image sensor such as CMOS-Ch ip, CCD chip or the like
• the sleeve tube is formed with one or more connecting webs between the two rohrformigen head ends, it is possible Igl, with the arrangement of a lens tube, which may be formed as described above, in the sleeve tube by bending the connecting bars or the lens tube to adjust and / / or to fix.
• the or the connecting webs are brought into contact with the peripheral surface of the objective tube.
• the sleeve tube is designed as a guide tube for the objective tube.
• the head ends of the sleeve tube are connected to each other by means of several, in particular bendable, connecting webs, wherein in particular the connecting webs are arranged uniformly and / or symmetrically in the circumferential direction of the sleeve tube.
• the connecting webs surrounds the objective tube inserted into the sleeve tube.
• a free space or a recess is formed in the circumferential direction of the sleeve tube between two adjacent connecting webs. It is possible that between the two end pipe sections or the rohrformigen head ends of the sleeve tube, the connecting webs are formed or arranged and connect the end-side pipe sections or rohrformigen head ends together.
• An image sensor is arranged on or in a head end of the sleeve tube, while the other tubular head end is open, so that the objective tube can be introduced into the sleeve tube via this second head end.
• the imaging unit is characterized in that in the circumferential direction of the sleeve tube, the width of one or the connecting webs is greater than the width of the free space or the width of the recess between two adjacent connecting webs.
• the one or more connecting webs in the radial direction with respect to the longitudinal axis of the sleeve tube, preferably to the longitudinal axis, are bendable or bent.
• a lens barrel with an optical element, in particular optical lens is accommodated, in particular the optical element in a, preferably centered, socket is arranged and in particular the socket in the objective tube gap-free is tense.
• the object is achieved by a surgical instrument, in particular endoscope, which is formed with a preceding imaging unit.
• the imaging unit is provided with an objective tube according to the invention with a socket accommodated therein for an optical element, in particular an optical lens, and / or with a sleeve tube according to the invention for a lens tube arranged or to be arranged therein.
• an optical element in particular an optical lens
• a sleeve tube according to the invention for a lens tube arranged or to be arranged therein.
• the object is further achieved by a method for producing an imaging unit for a surgical instrument, in particular dere endoscope, wherein the imaging unit comprises a sleeve tube, a lens tube arranged in the objective tube, wherein in the objective tube an optical element, in particular optical lens, is received, characterized by the following steps:
• the optical element is inserted into the objective tube provided with a longitudinal slit or the optical element is accommodated in a socket and is inserted with the socket into the objective tube provided with a longitudinal slit,
• the diameter, in particular the inner diameter, of the objective tube is reduced and / or the optical element or the holder of the optical element, preferably gap-free, in clamped the objective tube and
• the objective tube is inserted into the sleeve tube, in particular inserted.
• the imaging unit produced is preferably provided with the above-described objective tube and possibly sleeve tube, which are described above in detail. After the imaging unit has been produced, it is arranged, for example, in an endoscope shaft of an endoscope.
• an optical measuring device By means of an optical measuring device, the optical axis of the optical element is detected, so that bending of the or the connecting webs depending on the measurement results, the tilting of the optical axis of the optical element to the optical axis of the image sensor or with respect to the longitudinal axis of the sleeve tube is eliminated.
• the longitudinal slot of the objective tube is partially closed by welding in the longitudinal direction, in particular welded, so that in particular the diameter, in particular the inner diameter, of the objective tube is reduced, and / or the optical element or the socket of the optical element is braced.
• the method is characterized in that the L Lucassschl itz of the objective tube in the region of the optical element is not welded or is welded or outside the region of the optical element or is or that the longitudinal slot of the objective tube in the region of the socket of the optical element not welded is or will be and will be welded outside the scope of the socket.
• the objective tube is introduced into the sleeve tube, wherein the sleeve tube for the objective tube has two tubular head ends and the two head ends of the sleeve tube are interconnected by means of at least one, in particular bendable, connecting web or by means of several, in particular bendable, connecting webs.
• the imaging unit is formed with a lens tube and sleeve tube described above.
• a lens tube and sleeve tube described above.
• Fig. 1 an endoscope in a schematically simplified side view
• Fig. 2a schematically shows a simplified longitudinal section through a lens tube for an imaging unit of an endoscope
• Fig. 2b shows schematically an imaging unit of an endoscope with the imaging device shown in FIG. 2a lens tube shown in a longitudinal section;
• FIG. 2 c schematically shows a simplified longitudinal section through a lens tube for an imaging unit of an endoscope according to a further embodiment
• Fig. 3a schematically shows a simplified longitudinal section through a guide tube of an imaging unit of an endoscope for a lens tube
• Fig. 3b schematically shows a simplified cross-sectional view along the section line BB in FIG. 3a.
• the same or similar elements and / or parts are provided with the same reference numerals, so that apart from a new idea each.
• Fig. 1 shows, in a schematic and simplified side view, a preferably rigid endoscope 2, for example a video endoscope.
• the endoscope 2 comprises a tubular shaft 4, in which an optical element, for example an endoscope objective, is arranged.
• an operation and examination area which lies distally in front of a free end of the shaft 4, is observed or imaged.
• the image is relayed optically or electronically by the shaft 4, which opens into a housing 6.
• a housing 6 with an ocular funnel 8 is used to handle the endoscope 2.
• the side of the housing 6 is a light source 1 0, for example, an LED light source. This is connected via a connecting cable 1 2 with a suitable power supply.
• a handle and a video unit are preferably provided.
• a camera head 14 is arranged with an eyepiece adapter, not shown.
• the camera head 14 detects the light emerging from the endoscope 2 with an image sensor.
• the camera head 14 is supplied with power.
• a video endoscope corresponding optics and, for example, a CCD sensor as an image sensor.
• Fig. 2b shows an imaging unit 20 in a schematically simplified longitudinal sectional view with a lens tube 28 which is accommodated in a guide tube 22.
• the object tube 28 is shown in a schematic longitudinal section.
• the in Fig. 1 shown endoscope 2, the imaging unit 20.
• the imaging unit 20 comprises an optional image sensor 24 and at least one or more optical elements, in particular lenses.
• a plurality of optical lenses 38 are arranged one behind the other in the longitudinal direction (see Fig. 2a).
• Each of the lenses 38 is received in a centered socket 36 so that the lenses 38 are circumferentially surrounded by the respective socket 36.
• the centered socket 36 ensures that when the lenses 38 are arranged in the objective tube 28, the optical axis of the respective lens 38 is aligned collinear with the longitudinal axis 34 or center longitudinal axis of the objective tube 28.
• the centered sockets 36 are produced, for example, by an ultra-precision centering turning method and have an exact outside diameter.
• the objective tube 28 has an inner circumferential surface 32, so that when the sockets 36 with the centered lenses 38 are introduced into the objective tube 28, the sockets 36 are brought into contact with the inner lateral surface 32.
• the objective tube 28 also has a longitudinal slot 30, which extends in the longitudinal direction of the objective tube 28.
• the longitudinal slot 30 is welded in the objective tube 28 at different locations, for example using a high-energy laser, eg Nd-YAG laser.
• the longitudinal slot 30 welded in the areas between the contact surfaces of the sockets 38 with the inner circumferential surface 32, so that the longitudinal slot 30 has a plurality of spaced welds 40 in the longitudinal direction, wherein the welds in the sockets 36 are interrupted.
• the inner diameter of the objective tube 28 is reduced so that the lenses 38 and their respective socket 36 are braced without gaps in the objective tube 28.
• the welds 40 are interrupted in the region of the sockets 36 and lenses 38, so that the longitudinal slot 30 has slot-like openings 42.
• an adhesive e.g. a gap-passing screw locking lacquer are introduced to connect the socket 36 with the object ear 28.
• the imaging unit 20 has a sleeve tube guide tube 22 which is in a fixed spatial relationship to the image sensor 24, in particular a flat image sensor, for example a CCD or CMOS sensor.
• the image sensor 24 is arranged in the guide tube 22 in the illustrated embodiment.
• the objective tube 28 is at least partially accommodated or receivable in an interior space enclosed by the guide tube 22.
• the guide tube 22 and the lens tube 28 made of metal, in particular stainless steel.
• an adhesive gap is formed between the objective tube 28 and guide tube 22, so that the guide tube 22 and the objective tube 28 are connected to one another by introducing adhesive into the adhesive gap after an adjustment of the objective tube 28.
• the optical axes of the lenses 38 are aligned and aligned collinear to the longitudinal axis 34 and optionally preferably to the optical axis of the image sensor.
• the object tube 28 according to a further exemplary embodiment is shown in a schematic longitudinal section.
• a plurality of optical lenses 38 are arranged one behind the other in the objective tube 28 in the longitudinal direction, each lens 38 being or being brought into direct contact with the inner circumferential surface 32 of the objective tube 28 in the circumferential direction.
• the lenses 38 without socket 36 see FIG. 2c embodiment used in the objective tube 28.
• the objective tube 28 also has a longitudinal slot 30, which extends in the longitudinal direction of the objective tube 28.
• the longitudinal slot 30 in the objective tube 28 at various locations, for example using a laser, e.g. Nd-YAG laser, welded.
• the longitudinal slot 30 is welded in the areas between the lenses 38, so that the longitudinal slot 30 has a plurality of spaced-apart welds 40 in the longitudinal direction, wherein the welds 40 in the region of the lenses 38 are interrupted.
• the inner diameter of the objective tube 28 is reduced, so that the lenses 38 are clamped gap-free and without interposition of a socket or the like in the objective tube 28, whereby the lenses 38 in the circumferential direction in direct contact with the inner circumferential surface 32 are.
• the weld seams 40 are interrupted in the area of the lenses 38, so that the longitudinal slot 30 has slot-like apertures 42 and the lenses 38 are not in contact with the inner circumferential surface 32 in this region of the apertures 42.
• Fig. 3a is a longitudinal section through a guide tube 22 for receiving an object tube shown schematically.
• the guide tube 22 has two tubular head ends 52.1, 52.2. At the head end 52.2 of the image sensor 24 is received.
• the head end 52.1 is formed on the front side with an opening 54, so that via the opening 54 a lens tube is inserted or inserted into the guide tube 22.
• the guide tube 22 has between the head ends 52.1, 52.2 an undercut 56, so that the inner diameter of the opening 54 of the head end 52.1 is smaller than the inner diameter of the undercut 56th
• Fig. 3b is a schematic cross section through the guide tube 22 according to the embodiment shown in FIG. 3a drawn section line B-B shown.
• the bendable connection webs 60 by means of which the tubular head ends 52.1, 52.2 of the guide tube 22 are or are connected to one another, are arranged uniformly in the circumferential direction of the guide tube 22.
• the connecting webs 60 are in particular formed in this case as bending webs.
• the connecting webs 60 In order to bend or bend the connecting webs 60 radially inwards, as shown in FIG. 3a is indicated for the lower connecting web 60, during the adjustment of a (not shown here) objective tube, which is received in the interior of the guide tube 2 men, the connecting webs 60, for example, with a high-energy beam of a laser, such as Nd-YAG laser, acted upon, so that the connecting webs 60 are bent due to the heating by the radiation energy of the laser. As a result, the connecting webs are brought into contact with the outer peripheral surface of the objective tube disposed inside the guide tube 22.
• a laser such as Nd-YAG laser
• a tilting of the optical axis of the optics is eliminated using a corresponding measuring device in the adjustment of the objective tube and preferably the optical axis of the lenses inoll aligned to the optical axis 62 of the image sensor 24.

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

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Citations (2)

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• 2017
  • 2017-07-24 DE DE102017116652.1A patent/DE102017116652A1/de not_active Ceased
• 2018
  • 2018-07-10 WO PCT/EP2018/068614 patent/WO2019020359A1/de not_active Ceased
  • 2018-07-10 EP EP18743427.9A patent/EP3658001A1/de not_active Withdrawn
  • 2018-07-10 JP JP2020503950A patent/JP2020528318A/ja not_active Ceased
• 2020
  • 2020-01-03 US US16/733,827 patent/US20200146532A1/en not_active Abandoned

Patent Citations (2)

Non-Patent Citations (1)

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