DE59610558D1 - Stativ - Google Patents

Stativ

Info

Publication number
DE59610558D1
DE59610558D1 DE59610558T DE59610558T DE59610558D1 DE 59610558 D1 DE59610558 D1 DE 59610558D1 DE 59610558 T DE59610558 T DE 59610558T DE 59610558 T DE59610558 T DE 59610558T DE 59610558 D1 DE59610558 D1 DE 59610558D1
Authority
DE
Germany
Prior art keywords
tripod
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.)
Expired - Lifetime
Application number
DE59610558T
Other languages
German (de)
English (en)
Inventor
Andreas Metelski
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.)
Leica Instruments Singapore Pte Ltd
Original Assignee
Leica AG Switzerland
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4245876&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE59610558(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Leica AG Switzerland filed Critical Leica AG Switzerland
Application granted granted Critical
Publication of DE59610558D1 publication Critical patent/DE59610558D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/001Counterbalanced structures, e.g. surgical microscopes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/02Heads
    • F16M11/04Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/06Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
    • F16M11/10Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/20Undercarriages with or without wheels
    • F16M11/2007Undercarriages with or without wheels comprising means allowing pivoting adjustment
    • F16M11/2035Undercarriages with or without wheels comprising means allowing pivoting adjustment in more than one direction
    • F16M11/2064Undercarriages with or without wheels comprising means allowing pivoting adjustment in more than one direction for tilting and panning
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/42Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters with arrangement for propelling the support stands on wheels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21LLIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L14/00Electric lighting devices without a self-contained power source, e.g. for mains connection
    • F21L14/04Electric lighting devices without a self-contained power source, e.g. for mains connection carried on wheeled supports
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/06Bases for movable standing lamps; Fixing standards to the bases
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/50Supports for surgical instruments, e.g. articulated arms
    • A61B2090/5025Supports for surgical instruments, e.g. articulated arms with a counter-balancing mechanism
    • A61B2090/504Supports for surgical instruments, e.g. articulated arms with a counter-balancing mechanism with a counterweight
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/50Supports for surgical instruments, e.g. articulated arms
    • A61B2090/506Supports for surgical instruments, e.g. articulated arms using a parallelogram linkage, e.g. panthograph
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/20Surgical microscopes characterised by non-optical aspects
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M2200/00Details of stands or supports
    • F16M2200/04Balancing means
    • F16M2200/041Balancing means for balancing rotational movement of the head
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M2200/00Details of stands or supports
    • F16M2200/04Balancing means
    • F16M2200/044Balancing means for balancing rotational movement of the undercarriage
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/20Lighting for medical use

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microscoopes, Condenser (AREA)
  • Manipulator (AREA)
DE59610558T 1995-10-12 1996-10-12 Stativ Expired - Lifetime DE59610558D1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH297695 1995-10-12
PCT/EP1996/004454 WO1997013997A1 (de) 1995-10-12 1996-10-12 Stativ

Publications (1)

Publication Number Publication Date
DE59610558D1 true DE59610558D1 (de) 2003-07-31

Family

ID=4245876

Family Applications (2)

Application Number Title Priority Date Filing Date
DE59610558T Expired - Lifetime DE59610558D1 (de) 1995-10-12 1996-10-12 Stativ
DE29624639U Expired - Lifetime DE29624639U1 (de) 1995-10-12 1996-10-12 Stativ

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE29624639U Expired - Lifetime DE29624639U1 (de) 1995-10-12 1996-10-12 Stativ

Country Status (5)

Country Link
US (1) US6129319A (enExample)
EP (1) EP0855002B2 (enExample)
JP (1) JP4041536B2 (enExample)
DE (2) DE59610558D1 (enExample)
WO (1) WO1997013997A1 (enExample)

Families Citing this family (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19751781C2 (de) * 1996-11-22 2002-02-14 Leica Mikroskopie Systeme Ag H Mikroskop mit Positionsüberwachung
EP0983468B1 (de) * 1997-05-20 2003-11-05 Leica Mikroskopie Systeme AG Mikroskopstativ, insbesondere für ein operationsmikroskop
JP4145360B2 (ja) 1997-05-20 2008-09-03 ライカ ミクロスコピー ズュステーメ アーゲー 特に、手術顕微鏡のための台架
FR2775245A1 (fr) * 1998-02-25 1999-08-27 Vernay Etudes Conception Dispositif et procede de correction de l'assiette d'un sous-ensemble mobile par rapport a un chassis de vehicule "terrestre"
DE19809022A1 (de) * 1998-03-04 1999-09-09 Krieter Halterung für ein Operationsmikroskop
DE10042272B4 (de) 2000-08-29 2012-10-31 Leica Instruments (Singapore) Pte. Ltd. Stativanordnung
EP1193438B1 (de) 2000-09-28 2006-11-15 Leica Microsystems Schweiz AG Stativ
DE10142564A1 (de) 2000-09-30 2002-04-11 Zeiss Carl Stativ
DE20019106U1 (de) 2000-11-12 2001-02-22 Leica Microsystems Ag, Heerbrugg Stativ mit Parallelogrammträger und Balanciermechanismus
DE20019109U1 (de) 2000-11-12 2001-02-22 Leica Microsystems Ag, Heerbrugg Stativ, insbesondere für Operationsmikroskope
DE20019107U1 (de) 2000-11-12 2001-01-25 Leica Microsystems Ag, Heerbrugg Stativ
DE20019105U1 (de) 2000-11-12 2001-05-23 Leica Microsystems Ag, Heerbrugg Stativ
DE10123166A1 (de) * 2001-03-31 2002-10-10 Leica Microsystems Stativ. insbesondere für ein Operationsmikroskop
JP4754738B2 (ja) * 2001-08-30 2011-08-24 オリンパス株式会社 医療用保持装置及び医療装置
EP1295568A1 (en) 2001-09-20 2003-03-26 Carl Zeiss Instrument having a drape
DE10155719A1 (de) 2001-11-13 2003-05-22 Leica Microsystems Schweiz Ag Operations-Mikroskop
EP1326115B1 (de) * 2002-01-04 2007-02-21 Leica Microsystems (Schweiz) AG Stativ mit einer automatischen Balanciereinrichtung
DE10300620B4 (de) * 2002-05-18 2017-04-13 Carl Zeiss Meditec Ag Trägervorrichtung für ein medizinisch-optisches Gerät
US7170250B2 (en) * 2003-06-30 2007-01-30 Carl Zeiss Surgical Gmbh Holding arrangement having a device for actively damping vibration
DE102004008381B4 (de) * 2003-06-30 2014-09-25 Carl Zeiss Meditec Ag Haltevorrichtung, insbesondere für ein medizinisch-optisches Instrument, mit Mitteln zum Ausgleich eines Last-Drehmoments sowie ein Verfahren zum Einstellen eines Gleichgewichtszustandes in einer Haltevorrichtung
US7109678B2 (en) * 2003-06-30 2006-09-19 Carl-Zeiss-Stiftung Holding arrangement having an apparatus for balancing a load torque
US7594188B2 (en) * 2003-08-21 2009-09-22 Carl Zeiss Ag Operating menu for a surgical microscope
DE102004005094A1 (de) 2004-01-27 2005-08-18 Carl Zeiss Gerätehaltevorrichtung
DE102004004678B4 (de) * 2004-01-29 2005-12-29 Otto Bock Healthcare Gmbh Drehmomentsensor
US7172105B2 (en) * 2004-04-01 2007-02-06 Amaesing Tools Mfg. Inc. Apparatus for positioning pipe and tubing
US7543791B2 (en) * 2005-10-19 2009-06-09 Brown University Tunable inverse pendulum vibration isolation system
DE102007019363B4 (de) * 2007-04-23 2009-06-25 Jürgen Michael Knapp Operations-Assistenz-System
DE102007030892A1 (de) * 2007-05-09 2008-11-20 Schaeffler Kg Verfahren zum Messen von Beugemomenten an einem Gelenk und Messanordnung zur Durchführung des Verfahrens
US7677129B2 (en) 2007-09-28 2010-03-16 Intuitive Surgical, Inc. Multiaxis counterbalance and positioning system using a spatial linkage
JP2010149195A (ja) * 2008-12-24 2010-07-08 Iwao Yuasa 工具等重量軽減、作業支援装置
US9366378B2 (en) * 2009-02-11 2016-06-14 Siemens Medical Solutions Usa, Inc. Support arm for ultrasound scanning
DE102010051633A1 (de) 2010-11-17 2012-05-24 Ondal Medical Systems Gmbh Tragesystem mit Bedienungshilfe
DE202011110285U1 (de) * 2011-04-01 2013-10-31 Aevum Mechatronik Gmbh Einrichtung zur Erzeugung von Drehbewegungen, Vorrichtung sowie medizinische Leuchte
US8602612B2 (en) 2011-05-12 2013-12-10 Peter Stathis Electrically conductive ball joints and lighting fixtures using the joints
DE102011114525B4 (de) * 2011-09-29 2015-10-15 Carl Zeiss Meditec Ag Operationsmikroskop mit Wärme erzeugender Komponente und mit Kühlvorrichtung
DE102011056086A1 (de) * 2011-12-06 2013-06-06 Leica Microsystems (Schweiz) Ag Stativ zum Halten von mindestens einem medizinischen Gerät, insbesondere einem Mikroskop
DE102012100179B4 (de) * 2012-01-11 2013-07-18 Leica Microsystems (Schweiz) Ag Stativ zum Halten von mindestens einem medizinischen Gerät, insbesondere einem Mikroskop, sowie Anordnung aus einem solchen Stativ und mindestens einem daran befestigten medizinischen Gerät
DE102012202222B3 (de) * 2012-02-14 2013-06-06 Leica Microsystems (Schweiz) Ag Verstellbares Stativ
USD689644S1 (en) 2012-05-11 2013-09-10 Peter Stathis Lighting fixture
USD689645S1 (en) 2012-05-11 2013-09-10 Peter Stathis Lighting fixture
JP5961102B2 (ja) * 2012-11-30 2016-08-02 三鷹光器株式会社 医療用バランシングスタンドの自動バランス調整構造
JP5977659B2 (ja) * 2012-12-06 2016-08-24 三鷹光器株式会社 医療用バランシングスタンドの自動バランス調整構造
JP5953215B2 (ja) * 2012-12-07 2016-07-20 三鷹光器株式会社 医療用バランシングスタンドの自動バランス調整構造
DE102013201783B4 (de) * 2013-02-04 2019-03-07 Leica Microsystems (Schweiz) Ag Lageausgleichsvorrichtung für Stative für medizinische Geräte
DE102013005999A1 (de) * 2013-04-09 2014-10-09 Carl Zeiss Microscopy Gmbh Schwenkarmstativ für Digitalmikroskope
DE102014114478B3 (de) * 2014-10-06 2016-02-25 Leica Microsystems (Schweiz) Ag Digitales Mikroskop mit federgelagerter schwenkbarer Einheit
DE102014114479B3 (de) * 2014-10-06 2016-02-25 Leica Microsystems (Schweiz) Ag Digitales mikroskop mit klickstopp
DE102014114477B3 (de) * 2014-10-06 2016-02-25 Leica Microsystems (Schweiz) Ag Digitales Mikroskop mit einem Radialkolbenbremssystem
EP3130305B1 (de) 2015-08-12 2021-01-13 medineering GmbH Medizinischer haltearm
US9945715B2 (en) * 2015-09-30 2018-04-17 The Boeing Company Weight loader for moving at least two loads
JP6769600B2 (ja) * 2016-07-14 2020-10-14 三鷹光器株式会社 手術顕微鏡装置
CN108071922A (zh) * 2016-11-11 2018-05-25 四川炜麒科技股份有限公司 一种流速监测仪用挂架
US10767807B2 (en) 2017-02-15 2020-09-08 II Thomas Kulesia Appliance stand
EP3518014B1 (en) * 2018-01-30 2020-11-18 Leica Instruments (Singapore) Pte. Ltd. Balancing device and method for balancing a microscope
DE102019208287B4 (de) 2019-06-06 2023-04-20 Carl Zeiss Meditec Ag Verfahren zum Betreiben eines Operationsmikroskopiesystems sowie Operationsmikroskopiesystem
CN110805817B (zh) * 2019-11-13 2021-01-26 电子科技大学 基于粗精分离原理的下置悬挂式三自由度手机拍摄稳定器
US20210236228A1 (en) * 2020-01-31 2021-08-05 Globus Medical, Inc. Patient stabilization system
DE102020211130A1 (de) 2020-09-03 2022-03-03 Carl Zeiss Meditec Ag Verfahren und Vorrichtung zur Balancierung eines Mikroskopiesystems
US12329685B2 (en) * 2021-06-30 2025-06-17 Amo Development, Llc Counterbalance mechanism in ophthalmic laser system employing a variable beam balance to provide a variable net load
DE102023119417A1 (de) * 2023-07-21 2025-01-23 HAW Hochschule für Angewandte Wissenschaften Hamburg, Körperschaft des öffentlichen Rechts Haltevorrichtung für eine Komponente, System umfassend eine Haltevorrichtung und Verfahren zum Betreiben eines Systems
PL131853U1 (pl) * 2023-12-15 2025-06-16 Tech4Stars Spółka Z Ograniczoną Odpowiedzialnością Statyw

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH548568A (de) * 1972-08-18 1974-04-30 Contraves Ag Tragvorrichtung mit einem optischen beobachtungsgeraet.
US3891301A (en) * 1972-08-18 1975-06-24 Contraves Ag Adjustable support or stand for an optical observation instrument
DE8400384U1 (de) * 1983-03-01 1984-04-05 Jenoptik Jena Gmbh, Ddr 6900 Jena Vorrichtung zur Bewegung und Arretierung von Bodenstativen
DE9013260U1 (de) * 1990-09-19 1990-11-22 Fa. Carl Zeiss, 7920 Heidenheim Tragvorrichtung mit Gewichtsausgleich für ein Operationsmikroskop
JP3040806B2 (ja) 1990-10-03 2000-05-15 株式会社トプコン 顕微鏡装置
JPH066136B2 (ja) * 1991-12-25 1994-01-26 佐原 今朝徳 医療用光学機器のスタンド装置
JP2825721B2 (ja) * 1992-12-28 1998-11-18 三鷹光器株式会社 医療用光学機器のスタンド装置
JPH0773587B2 (ja) * 1993-03-18 1995-08-09 三鷹光器株式会社 医療用スタンド装置の2軸バランス調整構造
WO1994028815A1 (en) * 1993-06-15 1994-12-22 Mitaka Kohki Co., Ltd. Stand for optical device
DE4334069A1 (de) * 1993-06-21 1995-04-13 Zeiss Carl Fa Ausbalancierbares Stativ
DE4320443C2 (de) * 1993-06-21 2001-08-02 Zeiss Carl Ausbalancierbares Stativ
US5713545A (en) * 1995-12-13 1998-02-03 Mitaka Kohki Co. Ltd. Stand apparatus for medical optical equipments

Also Published As

Publication number Publication date
EP0855002B1 (de) 2003-06-25
US6129319A (en) 2000-10-10
DE29624639U1 (de) 2006-06-08
EP0855002B2 (de) 2011-12-21
WO1997013997A1 (de) 1997-04-17
EP0855002A1 (de) 1998-07-29
JP4041536B2 (ja) 2008-01-30
JP2001509861A (ja) 2001-07-24

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Legal Events

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Owner name: LEICA INSTRUMENTS (SINGAPORE) PTE. LTD., SINGA, SG

R102 Epo decision maintaining patent in amended form now final

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