EP1565121A1 - Piece a main medicale ou dentaire pourvue d'un ensemble d'engrenages multietage - Google Patents

Piece a main medicale ou dentaire pourvue d'un ensemble d'engrenages multietage

Info

Publication number
EP1565121A1
EP1565121A1 EP03775383A EP03775383A EP1565121A1 EP 1565121 A1 EP1565121 A1 EP 1565121A1 EP 03775383 A EP03775383 A EP 03775383A EP 03775383 A EP03775383 A EP 03775383A EP 1565121 A1 EP1565121 A1 EP 1565121A1
Authority
EP
European Patent Office
Prior art keywords
gear
planet
medical
carrier
dental handpiece
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.)
Withdrawn
Application number
EP03775383A
Other languages
German (de)
English (en)
Inventor
Bernhard Kuhn
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.)
Kaltenbach and Voigt GmbH
Original Assignee
Kaltenbach and Voigt GmbH
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 Kaltenbach and Voigt GmbH filed Critical Kaltenbach and Voigt GmbH
Publication of EP1565121A1 publication Critical patent/EP1565121A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
    • A61B17/1613—Component parts
    • A61B17/1622—Drill handpieces
    • A61B17/1624—Drive mechanisms therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/18—Flexible shafts; Clutches or the like; Bearings or lubricating arrangements; Drives or transmissions
    • A61C1/185—Drives or transmissions

Definitions

  • the present invention relates to a medical or dental handpiece which has a multi-stage gear arrangement with at least two planetary gears connected in series, in particular a dental surgical handpiece for placing and loosening implants.
  • handpieces In order to be able to use the electric or air motors usually provided at dental workplaces for these types of treatment, handpieces are used which have a gear arrangement to reduce the drive speed on the motor side. These so-called. Reduction gear can- ⁇ be realized in various ways, preferred for this purpose, however. Planetary gears are called used which enable a particularly good transfer of power flow.
  • a dental handpiece with a planetary gear is known, for example, from DE 42 21 403 C2 of the applicant.
  • the individual gear stages are each formed by identical components, the planet gear carrier protruding at the output end of a component and carrying the sun gear on the outside for the next gear stage.
  • one gear stage is then placed on the other, the projecting planet gear carrier of one stage engaging in the rear end of the next stage.
  • the present invention is based on the object of specifying a medical or dental handpiece with a gear arrangement having a plurality of planetary gears, the gear arrangement having improved properties with regard to its smoothness and stability. Furthermore, a particularly compact and space-saving arrangement should be made possible.
  • the handpiece according to the invention initially has a gear arrangement which contains at least two planetary gears connected in series, each planetary gear each having a sun gear mounted on a drive shaft, a planet gear carrier with several evenly distributed planet gears interacting with the sun gear, and a ring gear fixed to the housing and surrounding the planet gears Has internal toothing and wherein the planet gear carrier serves at least one gear stage as the drive shaft and carrier of the sun gear for the subsequent gear stage.
  • the drive shaft for each gear stage is extended beyond the sun gear driven by it and the planet gear carrier associated with this sun gear is rotatably arranged on the extension.
  • the interleaved arrangement of the planetary gear carriers obtained in this way enables, on the one hand, a more compact arrangement of the gear stages, and on the other hand increases the axial stability of the gear arrangement and thus its smoothness.
  • the planet gear carriers of all gear stages are designed as hollow shafts, the extension of the drive shaft for the first gear stage extending essentially centrally over the entire length of the gear arrangement through the openings of the planet gear carriers.
  • the drive shaft forms the first gear stage a central support element which forms a holder for the gear stages in the axial direction over the entire gear arrangement, whereby the axial stability of the gear arrangement is further improved.
  • the planet gear carriers are preferably slidably mounted with respect to the drive shafts engaging in them.
  • the ring gears for all gear stages are formed by a single sleeve-shaped component with an appropriately designed internal toothing.
  • This solution forms a common outer holder, which extends at least beyond the positions of the various planet gears, which in turn enables improved axial stability of the gear arrangement.
  • This inventive idea also leads to an improvement in the running properties of the arrangement.
  • This second solution is particularly useful when the sun gears and the planet gears of the individual gear stages each have identical dimensions.
  • the common ring gear can be formed using a simple cylindrical component.
  • the components of a planetary gear are at least partially made of a ceramic material, which is preferably silicon nitride (Si 3 N 4 ).
  • This material is characterized by its high stability and favorable friction properties - which enables a particularly effective but wear-free power transmission.
  • the drive shafts or the planetary gear carriers of the gear stages and the gearwheels arranged therein can consist of this ceramic material.
  • the gear arrangement preferably consists of two planetary gears connected in series, each gear stage each having a gear ratio of 3: 1.
  • Figure 1 shows an embodiment of a dental handpiece with a two-stage planetary gear arrangement according to the invention in section.
  • Fig. 2 is an enlarged view of the gear arrangement; and Fig. 3 shows the arrangement of the components of a gear stage in section.
  • the handpiece 1 shown in FIG. 1 consists of an elongated grip sleeve 2
  • the front end of a head piece can be arranged with a treatment tool rotatably mounted therein.
  • a treatment tool rotatably mounted therein.
  • Embodiment is a so-called elbow, i.e. the grip sleeve 2 has a rear and a front grip sleeve section 2a, 2b, the front grip sleeve section 2b being arranged somewhat angled with respect to the rear and both grip sleeve sections 2a and 2b being connected to one another in one piece.
  • the gear arrangement according to the invention could also be used in the same way for a straight handpiece.
  • the treatment tool mounted in the headpiece is driven by a drive shaft train which consists of a rear drive shaft section 3 arranged in the rear grip sleeve section 2a and a front drive shaft section 4 arranged in the front grip sleeve section 2b.
  • the power transmission between the rear drive shaft section 3 and the front drive shaft section 4 takes place via a gear arrangement 5 which is mounted by means of three roller bearings 6, 7 and 8 in a sleeve-like gear housing 9 which is located in the front region of the rear grip sleeve section 2a.
  • the gear arrangement 5 serves on the one hand to reduce the rotational speed of the rear drive shaft section 3 and on the other hand to deflect the force onto the angled front drive shaft section 4.
  • the force deflection takes place with the aid of a transmission element 10 arranged at the front end of the transmission arrangement 5, which is connected to the rear end of the front Drive shaft section 4 cooperates and forms a so-called angular gear.
  • This can be achieved, for example, by appropriately designed bevel gears on the transmission element 10 and the rear end of the front drive shaft train 4, as is known, for example, from DE 42 21 403 C2.
  • the grip sleeve 2 of the handpiece 1 can be connected to a drive part 11, which is only indicated and which contains the motor, for example an electric motor.
  • the coupling between the motor or the motor shaft of the drive part 11 and the rear drive shaft section 3 takes place via an elongated coupling sleeve 12 which has at its rear end an interlocking rotary element in the form of a slip-on slot 13, which at Joining handle sleeve 2 and drive member 11 is brought into drive connection with the motor or the motor shaft.
  • the gear arrangement 5 responsible for reducing the engine speed consists in the example shown of two series-connected planetary gears 20 and 30, the structure and arrangement of which will now be explained in more detail with reference to FIGS. 2 and 3.
  • Each gear stage 20 or 30 forms a complete planetary gear and consequently consists of a so-called sun gear 22 or 32 mounted on a drive shaft 21 or 31, a planet gear carrier 23 or 33 with three evenly distributed and interacting with the sun gear 22 or 32 Planetary gears 24 and 34 and a ring gear 25 and 35 surrounding the planet gears 24 and 34, respectively.
  • the basic functioning of a planetary gear is well known and is therefore only to be briefly summarized below with reference to the first gear stage 20.
  • This sun gear 22 is surrounded by three planet gears 24, which are also designed as gear wheels and are supported with their axes on the planet gear carrier 23 and interact with the sun gear 22.
  • the planet gear carrier 23 itself is rotatably supported with respect to the sun gear 22 or the drive shaft 21, the axes of rotation of the drive shaft 21 and the planet gear carrier 23 matching.
  • the planet gears 24 are mounted in a sleeve-shaped ring gear 25 which has an internal toothing 26 which interacts with the teeth of the planet gears 24.
  • the ring gear 25 itself is arranged fixed to the housing, so that when the drive shaft 21 and thus the sun gear 22 rotate, the planet gears 24 run around the outside around the sun gear 22, which results in an axial rotation of the planet gear carrier 23.
  • a corresponding selection of the toothing results in a reduction in the rotational speed of the planet gear carrier 23 in comparison with the rotational speed of the input-side drive shaft 21 and the sun gear 22.
  • the toothing is selected such that the speed of the planet carrier 23 is reduced to one third of the speed of the drive shaft 21, ie the gear ratio of this gear is 3: 1. Since the Torque transmission via a variety of interventions between the teeth of the sun gear 22 and the planet gears 24, the individual tooth flanks of the gears are less stressed in comparison to other gear types.
  • the arrangement of the various components of the first gear stage with respect to one another is shown in FIG. 3 with the exception of the planetary carrier 23.
  • the first gear stage 20 just described is followed by a second gear stage 30.
  • the planet gear carrier 23 of the first gear stage 20 also serves as the drive shaft 31 for the second gear stage 30 and consequently carries the second sun gear 32.
  • This in turn is in operative connection with three further planet gears 34 mounted on a second planet gear carrier 33, which in turn have an external one Interacting ring gear 35 with internal teeth 36.
  • the second gear stage 30 in turn causes the speed to be reduced to a third, so that the final speed of the planet carrier 33 of the second gear stage 30 corresponds to a ninth of the rotational speed of the input drive shaft 3. For example, if the drive speed on the motor side is 40,000 revolutions per minute, a rotational speed of 4,444 revolutions per minute is obtained on the output side of the gear arrangement shown.
  • the gear arrangement according to the invention is characterized by two special features which are to be explained below.
  • the two drive shafts 21, 31 for each gearbox 20, 30 - that is, the first drive shaft 21 and the first planet gear carrier 23, which also represents the drive shaft 31 for the second gear stage 30 - via the sun gear 22, 32 driven by it extended, the planet gear carrier 23, 33 belonging to a sun gear 22, 32 being rotatably arranged on the corresponding extension.
  • the two planetary gear carriers 23 and 33 are designed as hollow shafts with an increasing opening diameter, the extensions of the drive shafts 21 and 31 each extending into the axial openings of the planetary gear carriers 22 and 32, respectively.
  • the two planetary gear carriers 22 and 32 are hereby arranged partially nested, which enables an improved axial connection of the two gear stages 20 and 30 and thus an increased stability of the gear arrangement 5.
  • the overall arrangement can be kept very compact. Since the drive shafts 21 and 31 must be able to rotate with respect to the planet carrier 22 and 23, they are each slidably supported against each other. In the present case, the first drive shaft 21 is even extended forward so far that it extends centrally over the entire length of the gear arrangement 5 through the openings of the planet gear carriers 23, 33. The first drive shaft 21 thus forms a forwardly projecting bearing journal for the entire gear arrangement 5, as a result of which even further improved axial stability is achieved.
  • the two sun gears 22 and 32 have the same size due to the same transmission ratio of the two gear stages 20, 30. Since the respective planet gears 24 and 34 also have the same dimensions, a common ring gear can be used for both gear stages 20 and 30 according to the second inventive concept.
  • the ring gears are formed by a common sleeve-shaped component 40 with a correspondingly designed internal toothing 41. This common ring gear also increases the stability of the overall arrangement, which in turn results in increased smoothness of the transmission arrangement.
  • the gear arrangement 5 is designed to be very compact due to the measures according to the invention, it can also be designed as a structural unit which can be inserted into or removed from the handpiece as a whole. The maintenance of the handpiece will. thereby considerably simplified
  • a ceramic material in particular silicon nitride (Si 3 N 4 ), is used at least partially as materials for the components of the two gear stages 20 and 30.
  • This material is characterized by its high stability and insensitivity to external influences, especially its chemical resistance. Furthermore, since it has excellent sliding and friction properties compared to steel, the wear properties of the gears are improved with an optimal power transmission.
  • the arrangement according to the invention is accordingly distinguished by a compact design, which at the same time results in improved axial stability of the overall arrangement. Since this avoids undesirable vibrations, the service life of the gear arrangement is also increased.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Dentistry (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Epidemiology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Retarders (AREA)

Abstract

L'invention concerne une pièce à main médicale ou dentaire (1) équipée d'un outil de traitement entraîné par un mécanisme d'entraînement (11) par l'intermédiaire d'un ensemble d'engrenages (5). Cet ensemble d'engrenages (5) comprend au moins deux engrenages planétaires (20, 30) montés en série. Ces engrenages planétaires présentent chacun une roue solaire (22, 32) montée sur un arbre d'entraînement (21, 31), un porte-satellites (23, 33), pourvu de plusieurs satellites (24, 34) répartis de façon régulière et coopérant avec la roue solaire (22, 32), ainsi qu'une couronne (25, 35) à denture intérieure (26, 36), fixée au boîtier et entourant les satellites (24, 34), le porte-satellites (23) d'au moins un étage d'engrenage (20) servant d'arbre d'entraînement (31) et de support de roue solaire (32) pour l'étage d'engrenage suivant (30). L'objectif de cette invention est d'augmenter la stabilité de l'ensemble. A cet effet, l'arbre d'entraînement (21, 31) pour chaque étage d'engrenage (20, 30) est prolongé par l'intermédiaire de la roue solaire (22, 32) entraînée par cet arbre et le porte-satellites (23, 33) associé à cette roue solaire (22, 32) est monté de façon à pouvoir tourner sur le prolongement.
EP03775383A 2002-11-26 2003-11-21 Piece a main medicale ou dentaire pourvue d'un ensemble d'engrenages multietage Withdrawn EP1565121A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10255120 2002-11-26
DE10255120A DE10255120A1 (de) 2002-11-26 2002-11-26 Ärztlichees oder zahnärztliches Handstück mit mehrstufiger Getriebeanordnung
PCT/EP2003/013089 WO2004047664A1 (fr) 2002-11-26 2003-11-21 Piece a main medicale ou dentaire pourvue d'un ensemble d'engrenages multietage

Publications (1)

Publication Number Publication Date
EP1565121A1 true EP1565121A1 (fr) 2005-08-24

Family

ID=32240438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03775383A Withdrawn EP1565121A1 (fr) 2002-11-26 2003-11-21 Piece a main medicale ou dentaire pourvue d'un ensemble d'engrenages multietage

Country Status (5)

Country Link
US (1) US7448869B2 (fr)
EP (1) EP1565121A1 (fr)
JP (1) JP4398870B2 (fr)
DE (1) DE10255120A1 (fr)
WO (1) WO2004047664A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007030019A1 (de) 2007-06-29 2009-02-26 Kaltenbach & Voigt Gmbh Dentales Gerät oder Werkzeug
FR2955243B1 (fr) * 2010-01-19 2013-01-18 Micro Mega Int Mfg Sa Appareil pour entrainer en mouvement des outils utilises en chirurgie
US8696511B2 (en) * 2010-10-29 2014-04-15 Warsaw Orthopedic, Inc. Surgical instrument with plantary gear system
US9295815B2 (en) 2012-05-09 2016-03-29 Merit Medical Systems, Inc. Torquer device and methods related thereto
USD726376S1 (en) 2012-11-28 2015-04-07 Joseph A Stofko Dental floss holder
KR101370933B1 (ko) 2013-03-26 2014-03-25 (주)세신정밀 유성기어 동력전달 구조의 핸드피스용 앵글
CN103705312A (zh) * 2013-06-21 2014-04-09 佛山市彤鑫医疗器材有限公司 能输出大扭矩的植牙弯机
DE102014226325A1 (de) * 2014-12-17 2016-06-23 Sirona Dental Systems Gmbh Zahnärztliches Instrument mit einem Getriebe zum Antrieb eines Werkzeugs
CN106821521A (zh) * 2015-12-04 2017-06-13 太成男 内置减速齿轮的整体型牙科用机头手机
CN210077893U (zh) * 2018-12-28 2020-02-18 雅客智慧（北京）科技有限公司 牙科种植手机

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
DE1294591B (de) * 1967-04-27 1969-05-08 Austenal Europa Inc Zweigniede Handmotor fuer den Antrieb chirurgischer Werkzeuge mit verschiedenem Drehzahlbedarf
DE2717013C2 (de) * 1977-04-18 1986-08-14 Kaltenbach & Voigt Gmbh & Co, 7950 Biberach Zahnärztliches Handstück
FR2530454A1 (fr) 1982-07-22 1984-01-27 Micro Mega Sa Moteur a air a deux plages de vitesse distinctes pour l'entrainement de pieces rotatives de dentisterie
DE4221403C2 (de) 1992-06-30 1995-08-31 Kaltenbach & Voigt Ärztliches oder zahnärztliches Behandlungsinstrument mit einem angetriebenem Behandlungswerkzeug
JP3538452B2 (ja) * 1994-06-27 2004-06-14 株式会社ナカニシ 歯科治療装置
US5569034B1 (en) * 1995-01-04 1999-06-15 Mti Precision Prod Inc Dental handpiece providing low speed high torque rotary output using plural stage planetary gear reduction
DE19843951C2 (de) * 1998-05-26 2002-03-14 Kaltenbach & Voigt Antriebssystem für zahnärztliche Handstücke
US5993454A (en) * 1998-09-29 1999-11-30 Stryker Corporation Drill attachment for a surgical drill
US6846261B2 (en) * 2002-09-06 2005-01-25 General Motors Corporation Planetary gearset with multi-layer coated sun gear

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004047664A1 *

Also Published As

Publication number Publication date
JP4398870B2 (ja) 2010-01-13
WO2004047664A1 (fr) 2004-06-10
DE10255120A1 (de) 2004-06-03
JP2006507069A (ja) 2006-03-02
US7448869B2 (en) 2008-11-11
US20060121412A1 (en) 2006-06-08

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