EP3165207B1 - Zahnarztpatientenstuhl - Google Patents

Zahnarztpatientenstuhl Download PDF

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Publication number
EP3165207B1
EP3165207B1 EP16197167.6A EP16197167A EP3165207B1 EP 3165207 B1 EP3165207 B1 EP 3165207B1 EP 16197167 A EP16197167 A EP 16197167A EP 3165207 B1 EP3165207 B1 EP 3165207B1
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EP
European Patent Office
Prior art keywords
backrest
seat
patient
chair
arc
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EP16197167.6A
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English (en)
French (fr)
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EP3165207A1 (de
Inventor
Maurizio TROMBETTI
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Cefla SCARL
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Cefla SCARL
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Publication of EP3165207A1 publication Critical patent/EP3165207A1/de
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G15/00—Operating chairs; Dental chairs; Accessories specially adapted therefor, e.g. work stands
    • A61G15/02—Chairs with means to adjust position of patient; Controls therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G15/00—Operating chairs; Dental chairs; Accessories specially adapted therefor, e.g. work stands
    • A61G15/10—Parts, details or accessories
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G2200/00—Information related to the kind of patient or his position
    • A61G2200/30—Specific positions of the patient
    • A61G2200/32—Specific positions of the patient lying
    • A61G2200/327—Specific positions of the patient lying supine

Definitions

  • the present invention relates to the technical field of patient chairs used in dentistry. More particularly, the invention relates to an apparatus according to the preamble of claim 1 and a method according to the preamble of claim 9 allowing patient chair's movements.
  • Trendelenburg position or anti-shock position
  • the patient is supine, lying so that her/his head is lower than her/his knees and pelvis, to help maintain blood flow to the brain.
  • Trendelenburg position reclines patient's head allowing chest and legs to form an angle, instead of having chest and legs aligned in a position that can be uncomfortable for the patient.
  • Trendelenburg position eases dentist's work in performing some kind of therapies.
  • a problem linked to the reclining of backrest is that while the backrest reclines, patient's head, on which the dentist operates, progressively relocates in space, from a position substantially aligned with her/his hip joint, to a position wherein patient's head is at a marked distance from patient's hip, say in the order of 50-70 cm. This forces the dentist, normally positioned on patient's side or behind the patient, to replace with respect to the room and the dental treatment unit along with backrest reclining.
  • Figures, particularly Figures 3 and 4 will help to better clarify this effect.
  • Aim of the present invention is providing a mechanism allowing to bring the backrest from the upright position to the reclined position and vice versa, which is efficient and cost-effective to manufacture.
  • a second aim of the present invention consists in limiting the dentist's relocation connected to chair reclining.
  • the mechanism of the present invention allows a backrest movement that is coordinated with the seat, which shifts until it reaches an ergonomically correct position for the patient, in case of need until the maximal extension in Trendelenburg position.
  • This has the aim of maintaining as much as possible patient's head in the same position as when patients seats upright (longitudinal compensation movement). This movement allows to maintain the relative patient's head position with respect to water group, instruments table and operating lamp and with respect to the room (furniture and walls of the dental practice).
  • a further aim is obtaining a chair structure having a manufacturing modularity:
  • the present invention consists in obtaining the backrest movement through a combined arc prismatic guide system, through which the backrest is pivoted from the substantially vertical position or upright position to the substantially horizontal position or Trendelenburg position and vice versa.
  • the backrest is contextually translated along the chair longitudinal axis, in the direction of the seat and in the opposite direction, respectively, progressively and according to the tilting of the backrest itself, while said oscillation/translation is combined with a corresponding simultaneous translation of the seat, thanks to a four-bar linkage that moves said seat.
  • the arc prismatic guide system is dynamically connected to said four-bar linkage, the assembly being actuated by an actuator only.
  • a third mechanism is connected, which angularly moves the leg-rest with respect to the fixed seat.
  • the arc prismatic guide is centrally positioned, symmetrically with respect to the longitudinal chair axis, and it allows the articulation between the backrest and the fixed seat around an axis of rotation corresponding with patient's hip.
  • a lateral prismatic guide can be used (positioned either on the right or on the left side of the chair, or on both sides); nonetheless, this configuration has the disadvantage of being more cumbersome, hindering the access of the dentist to the patient in comparison to the preferred embodiment.
  • the backrest has at least an arc bracket supporting on one end the support of backrest upholstery, while its opposing end engages with a carriage in an arc guide.
  • Said arc guide is integral with the mobile structure with respect to the turret, which is in turn hinged with the pantograph arm, while said end supporting said at least one carriage is dynamically connected to at least one element of the four-bar linkage to which the seat supporting frame is connected.
  • the dynamic connection between arc guide system, or particularly between the backrest bracket and the four-bar linkage to which the seat is fastened, can be realized according to different modalities, which can be chosen from the different motion transmission system known by the skilled person.
  • a unique motorized actuator is dynamically linked to an element of the prismatic guide system, and moves correspondingly the four-bar linkage, and optionally the leg-rest moving mechanism, when this last is present.
  • the four-bar linkage, the prismatic guide system, the connecting transmission system between said prismatic guide system and four-bar linkage, and also the mechanism moving the leg-rest and the dynamically connecting transmission system between leg-rest and arc prismatic guide system, or the transmission between said system and the four-bar linkage are produced as modular subassemblies which can be assembled as desired on the structure of the chair, in particular on chair turret.
  • a first advantage of the present invention is the standardization of parts; with a minimal number of additional, modular components, the chair can be provided with more and more refined performances, going from a basic chair to a premium chair.
  • a further advantage is linked to the presence of a longitudinal compensation movement, in that the position of the water group and of the dental treatment unit remains about the same on the dentist's side, with any position of the backrest.
  • Figure 1 shows a typical dental patient chair 1 comprising a backrest 2, a fixed part 3 of the seat hinged with a leg-rest 13, a base 4 and a pantograph arm 5.
  • the chair 1 is shown with an upright backrest, about perpendicular to the floor.
  • a two-part seat chair having two articulations, one at the level of patient's hip and one at the level of patient's knees: therefore, the mobile leg-rest 13 can be hinged with the fixed part 3 of the seat.
  • the operation remains the same even for a chair having a unique part seat 3.
  • the pantograph arm 5 allows the lifting and lowering of the seat 3, indicatively from a height of 460 to 840 mm with respect to the floor.
  • the top end of the pantograph arm forms a sort of turret 14 supporting the reclining mechanism of the backrest and coordinated movement of the seat.
  • the structure of turret 14, base 4 and pantograph arm 5 is known, and is not the object of the present invention.
  • Figure 2 shows the same chair 1 in Trendelenburg position, with completely reclined backrest 2, about parallel to the floor.
  • the reclining of backrest 2 from the upright position shown in Figure 1 to the reclined position shown in Figure 2 occurs through an arc prismatic guide. Comparing Figure 3 and 4 one can appreciate how, while reclining the backrest 2, there is a longitudinal compensation movement, i.e. along the longitudinal axis of the (not shown) patient, towards her/his feet.
  • an arc of a circle simulates the movement of the head-rest and of the backrest 2; in the absence of the compensation movement that is the object of the present invention, patient's head would be in point K.
  • Drawing the (dotted) vertical extension of the K point, in Figure 4 it is shown that, with reclined chair, the distance q from point K projected in point B, with respect to reference point P on the fixed base of the chair is reduced thanks to the longitudinal compensation movement.
  • patient's head travels along an arc of circle and ends in point K, which is at a distance k from the fixed reference point P; said distance k corresponds to the cosine ( Figure 3 ).
  • seat 3 is instead translated towards patient's feet, which compensates in the desired quantity, reducing the distance k, which becomes the distance q shown in Figure 4 .
  • Figures 5 and 6 allow to appreciate both the arc guide system moving the leg-rest and the four-bar linkage in its entirety.
  • the backrest 2 at its end oriented towards the seat 3, has an arc-shaped bracket 102 connecting the backrest to the under seat 15 mobile with respect to the turret 14 hinged on the pantograph arm 5.
  • the end of said arc bracket 102 is engaged through e.g. a slide or a carriage in at least an arc guide integral to the turret and not visible in the Figures.
  • a transmission connects the end of said arc bracket 102 provided with the carriage with an element of the four-bar linkage controlling the movement of the seat, e.g. with one of piston rods 6, 7 or with a shaft coinciding with one of the articulation axis of the four-bar linkage.
  • the shifting of backrest 2 is dynamically connected to the shifting of the seat, and thanks to the arc guide system, the backrest not only modifies its tilting, but contextually progressively moves forward toward the seat with the progressive increase in reclining, from substantially upright to substantially horizontal and back with the tilting from substantially horizontal to substantially upright, while the seat follows according to a pre-set relative law of motion the shifting of the backrest in the chair longitudinal direction.
  • leg-rest 13 When a leg-rest 13 is present, it performs a combined pivoting and translating movement, synchronised with the movement of backrest 2 and seat 3.
  • said four-bar linkage or parallelogram comprises two piston rods 6 and 7, the fixed member turret 14 and mobile member under seat 15 (visible in Figure 6 only).
  • the four-bar linkage articulates on the pivot pins 8, 9, 10, 11 positioned on piston rods 6 and 7.
  • pivot pins 8 and 9 are hinged on turret 14, while pivot pins 10 and 11 are hinged on under seat 15, to which seat 3 is connected.
  • piston rods 6 and 7 being of different length, are about vertical, while piston rod 7 is in a higher position than piston rod 6, so that the seat is inclined with its part towards patient's feet higher than the part toward patient's head: this allows to obtain Trendelenburg position.
  • the basic version can be obtained with the seat 3 components in use today, which are fixed to the turret 14, in its turn hinged with the pantograph arm 5 through a simpler kit of leverages.
  • Adding a further leverage 12 the movement of the terminal part of the seat (leg-rest 13) with respect to the fixed seat 3.
  • actuators e.g. hydraulic, pneumatic, or electric actuators.
  • electromechanical actuators were used (endless screw, direct current or alternating current motor).

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Claims (9)

  1. Patientenstuhl (1), vorzugsweise für die Zahnheilkunde, umfassend:
    - eine Hebegruppe mit einer Basis (4), an der ein Pantograph-Arm (5) angelenkt ist, und einen am gegenüberliegenden Ende des Pantograph-Arms (5) angelenkten zu verschiebenden Turm (14),
    - eine Bewegungsgruppe zum relativen Bewegen eines Sitzes (3), umfassend ein Untersitzteil (15), das seinerseits über zwei Kolbenstangen (6, 7) mit dem Turm (14) gelenkig verbunden ist,
    und eine entlang eines Kreisbogens zurücklehnbare Rückenlehne (2), wobei der Stuhl (1) ferner einen Längsausgleichsmechanismus aufweist, der beim Zurücklehnen die Verstellung der Rückenlehne in Richtung der Längsachse des Patienten bewirkt,
    dadurch gekennzeichnet, dass ein prismatisches Bogenführungssystem für Zurücklehnbewegungen und Längsausgleichsbewegungen der Rückenlehne (2) vorgesehen ist und mit einem Gelenkviereck zur Bewegung des Untersitzelementes (15) und des Sitzes (3) dynamisch zusammenwirkt, wobei das Gelenkviereck die beiden Kolbenstangen (6, 7), den Turm (14) und das Untersitzteil (15), das den Sitz (3) mit dem Turm (14) verbindet, umfasst, und dadurch, dass
    - nur ein Aktuator vorgesehen ist, der mit einem Element des prismatischen Führungssystems dynamisch verbunden ist und entsprechend das Viergelenk bewegt und
    - und dass das Bogenführungssystem einen Stütz-Bogenbügel (102) der Rückenlehne (2) umfasst, wobei der Bogenbügel (102) mit seinem der Rückenlehne (2) gegenüberliegenden Ende in eine Bogenführung verschieblich eingreift, welche ebenfalls gegenüber dem relativ zu dem Drehturm (14) beweglichen Untersitzteil (15) ortsfest angeordnet ist, wobei das Verschieben des Bogenbügels (102) eine Veränderung der Rückenlehnenneigung und eine gleichzeitige Vefahrbewegung der Rückenlehne (2) in Richtung der Stuhllängsachse und entsprechend dem Kippwinkel und der Kipprichtung bewirkt.
  2. Patientenstuhl (1) nach Anspruch 1 oder 2, wobei der Aktuator ausgewählt ist aus der Gruppe bestehend aus: hydraulischen, pneumatischen, elektrischen oder elektromechanischen Aktuatoren.
  3. Patientenstuhl (1) nach einem oder mehreren der vorhergehenden Ansprüche, wobei der Sitz (3) fixiert ist und durch eine Hebelanordnung (12) eine Gelenkverbindung auf Höhe des Patientenknies mit einer Beinauflage (13) vorgesehen ist.
  4. Patientenstuhl (1) nach einem oder mehreren der vorhergehenden Ansprüche, wobei das Gelenkviereck zwei Kolbenstangen (6, 7) unterschiedlicher Länge umfasst.
  5. Patientenstuhl (1) nach Anspruch 5, wobei die kürzeste Kolbenstange (6) zum Patientenkopf hin positioniert ist, während die längste Kolbenstange (7) zu den Patientenfüssen hin positioniert ist.
  6. Patientenstuhl (1) nach einem oder mehreren der vorhergehenden Ansprüche, wobei die die Gelenkverbindung zwischen Rückenlehne (2) und Sitz (3) erlaubende prismatische Bogenführung symmetrisch zur Längsachse des Patienten mittig positioniert ist.
  7. Patientenstuhl (1) nach einem der Ansprüche 1 -6, wobei die die Gelenkverbindung zwischen Rückenlehne (2) und Sitz (3) erlaubende prismatische Bogenführung seitlich auf der rechten oder linken Seite bezüglich der Längsachse des Patienten positioniert ist.
  8. Patientenstuhl (1) nach einem der Ansprüche 1 -6, wobei zwei die Gelenkverbindung zwischen Rückenlehne (2) und Sitz (3) erlaubende prismatischen Bogenführungen vorgesehen sind, die seitlich auf der rechten und linken Seite in Bezug auf die Längsachse des Patienten angeordnet sind.
  9. Verfahren zum jeweiligen Bewegen einer Rückenlehne (2) und eines Sitzes (3) und optional einer Beinauflage (13) eines Stuhls (1) nach den Ansprüchen 1 bis 9, wobei das Verfahren eine Änderung der Rückenlehnenneigung und eine gleichzeitige Verfahrbewegung der Rückenlehne (2) in Richtung der Stuhllängsachse und entsprechend dem Kippwinkel und der Kipprichtung vorsieht, unter Verwendung mindestens eines prismatischen Bogenführungssystems und eines Gelenkvierecks (6, 7), das aus zwei Kolbenstangen besteht, die an einem festen Element, d. h. dem Turm (14), und einem beweglichen Element, d. h. dem mit dem Sitz (3) verbundenen Untersitzteil (15) angelenkt sind, wobei Zapfen (8, 9, 10, 11) an den Kolbenstangen (6, 7) als Drehpunkte vorgesehen sind, dadurch gekennzeichnet, dass es einen Stütz-Bogenbügel (102) der Rückenlehne (2) verwendet, wobei der Bogenbügel mit seinem der Rückenlehne (2) gegenüberliegenden Ende in einer Bogenführung verschieblich eingreift und gegenüber dem relativ zu dem Turm (14) beweglichen Untersitzteil (15) ortsfest ist und nur einen Aktuator verwendet.
EP16197167.6A 2015-11-05 2016-11-03 Zahnarztpatientenstuhl Active EP3165207B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2015A004959A ITUB20154959A1 (it) 2015-11-05 2015-11-05 Poltrona odontoiatrica

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EP3165207A1 EP3165207A1 (de) 2017-05-10
EP3165207B1 true EP3165207B1 (de) 2018-09-26

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CN (1) CN106667713B (de)
IT (1) ITUB20154959A1 (de)

Cited By (1)

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WO2023208286A1 (de) * 2022-04-27 2023-11-02 Krause Ruediger Behandlungsliege

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CN112353621A (zh) * 2020-11-27 2021-02-12 马梅伍 一种用于耳鼻喉科的可调节手术椅

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US3934929A (en) 1974-09-03 1976-01-27 Sybron Corporation Adjustable dental chair
FR2598911B1 (fr) * 1986-05-22 1990-06-08 Direct Usine Salons Fauteuil medical dont le deploiement et la hauteur sont commandes automatiquement de facons independantes
IT1200176B (it) 1986-07-18 1989-01-05 Castellini Spa Struttura per poltrone con sedile e schienale mobili, in particolare per uso odontoiatrico
US5790997A (en) * 1995-08-04 1998-08-11 Hill-Rom Inc. Table/chair egress device
CN2664484Y (zh) * 2003-10-28 2004-12-22 胡柱根 一种可实现倒立的按摩椅
DE102004052924A1 (de) * 2004-10-29 2006-05-04 Kaltenbach & Voigt Gmbh & Co. Kg Behandlungsstuhl, insbesondere dentalmedizinischer Behandlungsstuhl
CN103735385A (zh) * 2014-01-16 2014-04-23 咸阳西北医疗器械(集团)有限公司 用于牙科椅的水平补偿机构
CN206198240U (zh) * 2016-07-10 2017-05-31 鄢兰元 一种脚蹬式伸缩型舒适牙科椅

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Publication number Priority date Publication date Assignee Title
WO2023208286A1 (de) * 2022-04-27 2023-11-02 Krause Ruediger Behandlungsliege

Also Published As

Publication number Publication date
EP3165207A1 (de) 2017-05-10
CN106667713B (zh) 2020-05-05
ITUB20154959A1 (it) 2017-05-05
CN106667713A (zh) 2017-05-17

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