EP0139118B2 - Operationstisch - Google Patents

Operationstisch Download PDF

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Publication number
EP0139118B2
EP0139118B2 EP84108941A EP84108941A EP0139118B2 EP 0139118 B2 EP0139118 B2 EP 0139118B2 EP 84108941 A EP84108941 A EP 84108941A EP 84108941 A EP84108941 A EP 84108941A EP 0139118 B2 EP0139118 B2 EP 0139118B2
Authority
EP
European Patent Office
Prior art keywords
bearing surface
piston
pressure
cylinders
operating table
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
EP84108941A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0139118A1 (de
EP0139118B1 (de
Inventor
Eberhard Dr. Ing. Schnelle
Rüdiger Dipl.-Ing. Mussler
Hans-Ulrich Dipl.-Ing. Jung
Reinhard Dipl.-Ing. Pfeuffer
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.)
Stierlen Maquet AG
Original Assignee
Stierlen Maquet AG
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
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Application filed by Stierlen Maquet AG filed Critical Stierlen Maquet AG
Publication of EP0139118A1 publication Critical patent/EP0139118A1/de
Application granted granted Critical
Publication of EP0139118B1 publication Critical patent/EP0139118B1/de
Publication of EP0139118B2 publication Critical patent/EP0139118B2/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
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/02—Adjustable operating tables; 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
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/02—Adjustable operating tables; Controls therefor
    • A61G13/06—Adjustable operating tables; Controls therefor raising or lowering of the whole table surface
    • 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
    • A61G2203/00—General characteristics of devices
    • A61G2203/10—General characteristics of devices characterised by specific control means, e.g. for adjustment or steering
    • A61G2203/12—Remote controls

Definitions

  • the invention relates to an operating table, comprising a bearing surface with a plurality of bearing surface sections which can be adjusted relative to one another by means of hydraulic working cylinders, a support column for the bearing surface with a column head on which the bearing surface is pivotably mounted about its longitudinal axis and / or its transverse axis and by means of hydraulic Working cylinder is adjustable, and with a column base, which is connected to the column head by a hydraulic lifting device, and a hydraulic unit for actuating the working cylinder and the lifting device with a hydraulic pump, a pump motor and a pressure medium tank.
  • a hydraulically adjustable treatment table which differs from the operating table mentioned at the outset in that the bearing surface is mounted on the column head so as to be adjustable only about a horizontal transverse axis.
  • the column head is formed in one piece with a height-adjustable column jacket on which the hydraulic unit for actuating the hydraulic lifting device and the working cylinder for adjusting the bearing surface sections are arranged.
  • This has the advantage that all pressure medium lines between the hydraulic unit and the working cylinders acting on the column casing or on the bearing surface sections are essentially fixed in length and only have to be flexible to a certain extent in order to be able to follow a pivoting movement of the bearing surface relative to the column casing. Pressure fluid lines between the column head and the column base are eliminated.
  • the lifting device In order to be able to adjust the height of the bearing surface of a hydraulically driven operating table over the necessary large area, the lifting device usually comprises a double telescopic working cylinder, in which a first piston is displaceably guided in a cylinder and a second piston is guided coaxially in this cylinder.
  • the first piston When the bearing surface is raised, the first piston is first extended to a stop and then the second piston is moved.
  • the second piston With constant pressure medium inflow per unit of time, the second piston is displaced at a higher speed than the first piston, so that when the bearing surface is adjusted in height there is a significant jump in speed, which is uncomfortable for the person lying on the operating table and with height adjustments that occur during an operation may be necessary to obstruct the surgeon.
  • the invention has for its object to provide an operating table of the type mentioned in such a way that while maintaining a large adjustment range and with a very compact design of the lifting device, a height adjustment of the bearing surface can be achieved over the entire area at a uniform speed.
  • the hydraulic unit is arranged directly on the column head, that the lifting device comprises two reciprocating cylinder cylinders of equal internal cross section, one piston rod of which is connected to the column head and the other piston rod of which is connected to the column base, the two lifting cylinders being connected in series are and the pressure medium inflow and outflow to and from the lifting cylinders through the piston rod connected to the column head, and that the lifting cylinders are clamped between two blocks connected by tie rods, in which connecting holes for pressure medium connection of the two working cylinders are formed, the piston-side ends of the two lifting cylinders on the one hand and the piston rods the ends of the lifting cylinders on the other hand are each connected via a pressure medium line connecting the blocks.
  • the pressure medium connections between the hydraulic unit and the cylinders remain fixed, while the unit consisting of the two cylinders moves when the two piston rods are extended and retracted.
  • the pressure medium first flows through the piston rod connected to the column head into the lower-lying cylinder chamber of this lifting cylinder and from there through the above-mentioned pressure medium line to the above-lying piston-side cylinder chamber of the other lifting cylinder, while the pressure medium displaced from the annulus at the bottom Leaves the end of the second lifting cylinder, is guided via the second pressure medium line to the upper end of the annular space of the first lifting cylinder and flows back to the hydraulic unit via a radial bore in the piston of the first lifting cylinder and a second line in the piston rod of the first lifting cylinder.
  • a simple to produce, stable and compact guidance of the bearing surface of the operating table is obtained by a guide device comprising a first guide rod connected to the column head and a second vertical guide rod directed parallel to this and connected to the column base, each in one of two in a guide block sliding guides formed parallel to one another are displaceable and non-rotatably guided relative to the guide block, the guide block being able to be coupled to the lifting cylinders of the lifting device for movement in the vertical direction.
  • the guide rods preferably have a rectangular cross section, so that the guide rods cannot be rotated relative to the guide block.
  • the guide block can be manufactured in a simple manner by having a U-profile with a rectangular cross-section, which is divided into two guide chambers for the guide rods by a partition wall parallel to the U-legs and closed by a cover plate parallel to the U-crosspiece.
  • the rectangular cross-section of the guide rods enables exact adjustment of the play of the guide rods in the guide chambers even in the case of larger tolerances.
  • wedge surfaces are formed on both sides of the dividing wall, which cooperate with wedges that can be adjusted parallel to the dividing wall in order to adjust the rod play.
  • a simple pressure plate is sufficient to set the rod play in the second direction, both the latter and the wedges being adjustable by means of adjusting screws arranged in the guide block.
  • the hydraulic unit have a high-pressure circuit for actuating the working cylinders and the lifting device and a low-pressure circuit for controlling the valves connecting the working cylinders to the hydraulic pump or the pressure medium tank.
  • the low-pressure circuit can be branched off from the high-pressure circuit of the hydraulic unit and enables the use of a portable manual register that contains all the control valves and is connected to the valves of the working cylinders by flexible control lines.
  • the control valves preferably each comprise a control piston which is arranged displaceably in a bore of a valve housing which is closed by a flexible membrane and is displaceable from a closed position against a restoring force into an open position.
  • This control piston can be moved from its closed position into its open position by direct pressure on the flexible membrane.
  • the restoring force must be selected to be relatively high in order to ensure that the control piston returns to its closed position as soon as the membrane is released.
  • a high restoring force would mean that the operator may have to depress the control piston for a relatively long time with a relatively high force.
  • the control valves are designed Made according to the invention such that in the open position the piston area acted upon by the control pressure in the sense of a valve opening is larger than the piston area acted on in the sense of a valve closure, the area difference being selected such that the force resulting from the control pressure and acting in the opening direction is less than the restoring force .
  • the full restoring force must be overcome when the control valve is opened, but only a relatively small holding force then needs to be applied when the control piston is held in the open position.
  • the bearing surface generally comprises a central section which is connected to the column head via a joint arrangement which enables the central section to pivot about a horizontal axis directed parallel to the longitudinal bearing surface direction and an axis transverse to the longitudinal bearing surface direction and parallel to the bearing surface, each of which Bearing surface section has two side rails, each of which is pivotally connected to the side rails of adjacent bearing surface sections about axes directed transversely to the longitudinal bearing surface direction and are adjustable by means of the double-acting working cylinders.
  • the side members of a bearing surface section are usually rigidly connected by a cross member. However, these cross bars have the disadvantage that they hinder the use of X-ray devices.
  • each bearing surface section are mechanically independent of one another and that the working cylinders assigned to the two side rails of each bearing surface section are connected in series such that the annular space surrounding the piston rod of one working cylinder is connected to the piston-side cylinder space of the other working cylinder , wherein the cross-sectional areas of the annular space of one working cylinder and the piston-side cylinder space of the other working cylinder are the same size.
  • the two working cylinders, which move the two spars of a bearing surface section are synchronized, so that the mechanically rigid connection between the two side rails of a bearing surface section can be dispensed with.
  • the vent connection of the vent valve is connected to the pressure medium tank via a pressure relief valve. If, for example, the liquid column between the two pistons of the working cylinders connected in series is too large, excess pressure medium can be discharged via the pressure relief valve to the pressure medium tank when the vent valve is opened and the working pressure is applied to the piston. In the opposite case, i.e. If the liquid column between the two pistons is too small, it can be provided that the vent connection of the vent valve is connected to the high pressure circuit via a pressure control valve, the pressure set at the pressure control valve being less than the pressure set at the pressure relief valve. In this way it is possible, for example, to fully extend the first piston and to refill pressure medium from the high pressure circuit via the pressure control valve in this position of the two pistons without the pressure medium being able to flow off to the pressure medium tank via the pressure limiting valve.
  • each bearing surface section are usually screwed to a support plate, on each of which a cushion is placed or buttoned.
  • Liquids e.g. blood
  • the pads have to be removed after each operation and cleaned and disinfected as well as the support plates.
  • the upholstery in each case comprise a plate that can be connected to the side rails by releasable locking means.
  • the upholstery can be removed from the side rails together with the panels and cleaned easily.
  • the plate is preferably foamed into the pad made of integral foam.
  • the column 12 comprises a column base 14 and a column head 16, which are connected to one another by a lifting device 18 and a guide device 20.
  • the column head 16 comprises a rectangular base plate 22, on the underside of which a hydraulic unit 24 is fastened in a closed cuboid housing, the construction of which will be explained in more detail later.
  • the structure of the lifting device 18 will be described in more detail below with reference to FIGS. 3, 6 and 7. It comprises two lifting cylinders 26 and 28 which are arranged antiparallel to one another such that the piston rod 30 of the lifting cylinder 26 is rigidly connected to the base plate 22 of the column head 16 and the piston rod 32 of the lifting cylinder 28 is rigidly connected to a base plate 34 of the column base 14.
  • the cylinder sleeves 36 of the lifting cylinders 26 and 28, which are open at both ends, are each inserted into a bore 38 of a block 40, the two blocks 40 being rigidly connected to one another by means of tie rods 42, so that the cylinder sleeves 36 are clamped between the blocks 40.
  • the two blocks 40 are of identical design and each contain connecting bores 44 and 46 which each connect the receiving bores 38 for the ends of the cylinder liners 36 to a pressure medium line 48 which connect the two blocks 40 to one another. Contrary to the representation in FIG. 6, these connecting bores 44 and 46 do not lie in the plane containing the cylinder axes, but on both sides thereof, as can be seen from FIG. 7.
  • the arrangement of the connecting bores 44 and 46 and the connecting lines 48 between the blocks 40 is made such that the lower end of the lifting cylinder 26, i.e. its piston-side cylinder space 50 with the upper end, i.e. is in turn connected to the piston-side cylinder space 52 of the lifting cylinder 28, while the lower end of the annular space 54 of the lifting cylinder 28 is connected to the upper end of the annular space 56 of the lifting cylinder 26.
  • the piston rod 30 of the reciprocating piston 26 is formed by a tube which is closed at its lower end by the piston 58 and at its upper end by a stopper 60, on which two pressure medium connections 62 and 64 are located.
  • the pressure medium connection 62 is connected to the interior 66 of the tubular piston rod 30, this interior 66 in turn being connected to the annular space 56 of the lifting cylinder 26 via an axially parallel bore 68 and a radial bore 70 in the piston 58.
  • a further tube 72 is arranged, which is screwed into the plug 60 at its upper end and communicates with the pressure medium connection 64, while it is screwed into the piston 58 with its lower end and via a coaxial one Bore 74 in the piston 58 communicates with the piston-side cylinder space 50.
  • pressure medium flows via the pressure medium connection 64, the tube 72, the bore 74 in the piston 58 into the piston-side cylinder space 50 of the lifting cylinder 26 and presses the piston 58 upward.
  • the pressure medium flows via the connecting lines 44 and 48 into the upper block 40 and there through the corresponding connecting bore 44 into the piston-side cylinder space 52 of the lifting cylinder 28 and presses the piston 76 of the lifting cylinder 28 downward.
  • the pressure medium displaced from the annular space 54 flows through the connecting bore 46 and the pressure medium line 48 to the upper end of the annular space 56 of the lifting cylinder 26 and from there through the bores 70 and 68 in the piston 58 into the interior 66 of the piston rod 30 and from there over the Pressure medium connection 62 back to the hydraulic unit 24.
  • the piston rods 30 and 32 are retracted, the pressure medium flows in the opposite direction.
  • the piston 58 first moves to its upper stop before the piston 76 moves.
  • the pistons have the same cross section, the piston rods 30 and 32 are extended at the same speed, so that there is no jump in speed when the second piston starts to run.
  • the pressure medium connections 62 and 64 are permanently installed on the column head 16, so that the connecting lines between the lifting device 18 and the hydraulic unit 24 are not moved when the piston rods 30 and 32 are extended and retracted.
  • the guide device 20 in the height-adjustable column 12 serves to introduce the horizontal forces acting on the bearing surface 10 and the moments exerted by the bearing surface 10, which will now be explained in more detail below with reference to FIGS. 4 and 5.
  • the guide device 20 comprises a first guide rod 78, which is rigidly connected to the base plate 22 of the column head 16, and a second guide rod 80, which is rigidly connected to the base plate 34 of the column base 14. Both guide rods 78 and 80 have a rectangular cross section and are displaceably guided parallel to one another in two guide chambers 82 of a guide block 84.
  • the guide block 84 consists of a U-shaped rail 86 with a rectangular cross-section, the interior of which is divided into the two guide chambers 82 by a partition 88 parallel to the U-legs.
  • the U-profile rail 86 is closed by a cover plate 90 which is screwed to the U-profile rail 86.
  • the partition 88 has on both sides a wedge surface 92, which cooperates with a wedge 94, which is displaceable by means of an actuating screw 96 which can be actuated through the cover plate 90, and thereby the play of the guide rods 78 and 80 changed in a direction perpendicular to the partition 88, as can be seen in particular in FIG. 5.
  • a setting plate 98 is arranged on the inside of the cover plate 90, which can be screwed through the cover plate 90 perpendicular to the cover plate 90 by means of screws 100.
  • the setting plates 98 and the wedges 94 offer the possibility of ensuring that the guide rods 78 and 80 are properly guided in the guide block 84 even with relatively large tolerances.
  • a plate 102 is fastened to the outside of the guide block 84 facing the lifting device 18 and engages in the space between the blocks 40 of the lifting device 18 without the lifting device and the guide device being connected to one another. As a result, the guide block 84 is carried along when the cylinder block of the lifting device 80 is raised.
  • the bearing surface 10 is mounted on the column head 16 in a manner known per se such that it can be inclined about an axis directed transversely to its longitudinal direction and tilted about an axis running parallel to its longitudinal direction.
  • a first frame 106 is mounted on a bearing block 104 rigidly connected to the base plate 22 of the column head 16 so as to be pivotable about an inclination axis 108 directed transversely to the longitudinal direction of the bearing surface.
  • the first frame 106 has a fork 110 which is connected in an articulated manner to the piston rod 112 of an inclination cylinder 114.
  • the tilt cylinder 114 is pivotally mounted below the base plate 22 of the column head 16 on two struts 116 rigidly connected to the base plate, the piston rod 112 passing through an opening (not shown) in the base plate 22.
  • the inclination cylinder 114 is connected to the hydraulic unit 24 via pressure medium lines, of which only one pressure medium line 118 is shown.
  • a second frame 124 is pivotally mounted about a canting axis 122 running perpendicular to the inclination axis and parallel to the longitudinal direction of the bearing surface, with which a central section 126 of the bearing surface 10 is rigidly connected.
  • the second frame 124 is adjustable with the aid of a hydraulic working cylinder 128, which is articulated in a fork 130 connected to the first frame 106 and engages with its piston rod on a U-shaped bracket 132, which is articulated with the second frame 124 via connecting struts 134 connected is.
  • the pressure medium lines of the actuating cylinder 128 with the hydraulics 124 are not shown in FIGS. 2 and 3.
  • the bearing surface 10 consists, in addition to the already mentioned middle section 126 rigidly connected to the second frame 124, of two back sections 136 and 138 (FIG. 1) and a leg section 140 adjoining the other side of the middle section 26.
  • Each bearing surface section consists of two side rails 142 (see FIG. 12), which can be formed by U-profiles or box profiles and on which support pads 144 are arranged.
  • the adjacent side rails 142 on each side of the bearing surface 10 are each articulated in a manner known per se about an axis 146 directed transversely to the longitudinal direction of the bearing surface and adjustable relative to the respectively adjacent side rail 142 by a working cylinder 148, the cylinder of which is supported on the one side rail and its piston rod engages the adjacent side rail.
  • the support pad 144 shows the connection of a support pad 14 with two side rails 142.
  • the support pad 144 consists of a foam layer 150 into which a rigid plate 152 forming the underside of the pad 144 is foamed. This has undercut latch openings 154, into which the side rails 142 connected locking heads 156 can snap.
  • the support pads 144 can thus be connected to or detached from the side rails 142 without the aid of tools. This makes it easier to clean the support pads 144.
  • the hydraulic unit 24 comprises a pressure medium tank 164 and a pump 166 which is driven by an electric motor 168.
  • the pump generates a pressure P1 at its outlet.
  • T1 is the return line to the pressure medium tank 164.
  • a first valve control block 170 which contains a pressure limiting valve 172, which in the present case sets the pressure P1 generated by the pump to 100 bar. This is the working pressure to operate the working cylinders used on the operating table.
  • the valve control block 170 also contains the actuation valves 174 and 176 for the lifting device 18 and the tilt cylinder 114. The positions of the valves and thus the connection of the lifting cylinders of the lifting device 18 and the tilt cylinder 114 result directly from the usual hydraulic symbols.
  • the valves 174 and 176 are actuated via control lines X1, Y1 and X2, Y2 by the control register 178 shown in FIG. 10, which will be explained in more detail below.
  • the first valve control block 170 is followed by a second valve control block 180, at the input of which the pressure P1 is also present.
  • the valve control block 180 initially contains the actuation valves 182, 184, 186 and 188 for the working cylinder 128 for tilting the bearing surface 10 and the actuating cylinders 148 of the leg section 140, the first back section 136 and the second back section 138 of the bearing surface 10.
  • the valves 182 to 188 become each controlled by control register 178 via control lines X3, Y3, X4, Y4, X5, Y5, and X6, Y6. They connect either the piston-side cylinder space and the annular space of the working cylinders assigned to them with the pressure line carrying the working pressure of 100 bar or the return line to the pressure medium tank 164, as is readily apparent from the usual hydraulic symbols.
  • the actuating cylinders 148 of each individual section of the bearing surface 10 are each connected in series, the annular space of the first actuating cylinder 148 being connected to the piston-side cylinder space of the downstream actuating cylinder 148 via a pressure medium line 190.
  • the cross-sectional dimensions of the two actuating cylinders of each section connected in series are selected such that the cross-sectional area of the annular space of the first actuating cylinder is equal to the cross-sectional area of the piston-side cylinder space of the downstream second actuating cylinder, so that when the actuating cylinder 148 of a bearing surface section is pressurized with oil, the pistons of both Actuating cylinders are shifted by the same amount.
  • a valve 192 is switched on in the pressure medium line 190, the connection of which is connected on the one hand via a pressure control valve 194 to the pressure side of the pump 166 and on the other hand via a pressure relief valve 196 to the pressure medium tank 164 .
  • the pressure at the pressure control valve is set to a value below the working pressure, 30 bar in the present example.
  • the pressure at the pressure relief valve is set to a value between the working pressure and the pressure at the pressure control valve 196, 40 bar in the present example.
  • the two actuating cylinders 148 of the pair are pressurized via the connection A4 or B4 until one of the pistons has reached its end position. If the pressure medium column between the two pistons is too large, the piston connected downstream in the flow direction of the pressure medium first reaches its end position, while the first piston cannot reach this end position. In this case, after opening the valve 192, the first piston continues to be subjected to the working pressure, the excess pressure medium being able to flow out of the pressure medium column between the two pistons via the pressure limiting valve 196 to the pressure medium tank 164 until the first piston has likewise reached its end position . Now both pistons are in the same basic position. The valve 192 is closed and a subsequent actuation of the pair of cylinders ensures that the two pistons run in synchronism.
  • the method described above has the advantage that the synchronization of the pistons of a pair of cylinders can be set by the hydraulic system itself without having to be opened at any point. This is of the utmost importance with regard to the cleanliness of the operating table. The hydraulic system itself always remains locked. The procedure described above can be repeated at any time.
  • the actuation valves 174, 176 and 182 to 188 are also controlled hydraulically in a low-pressure circuit, which is branched off from the high-pressure circuit at the working pressure via a pressure control valve 198 in the second valve control block 180.
  • a pressure of 12 bar is used for the control circuit.
  • the control register 178 which is designed as a portable manual register, can be connected to the actuating valves 174, 176 and 182 to 188 via thin control lines X1 to X6 and Y1 to Y6, these thin control lines being able to be combined to form a flexible line 200 (FIG. 1), so that the operating table can be controlled from any location, restrictions being imposed only by the length of the strand 200.
  • the control register 178 contains a number of control valve pairs corresponding to the number of actuating valves, each control valve 202 of a pair controlling a working direction of the double-acting hydraulic cylinders.
  • FIG. 11 The structure of a control valve 202 is shown in more detail in FIG. 11.
  • Each comprises a housing 204 with a connection 206 for the low-pressure line (P2 in FIG. 10), a connection 208 for the line to the pressure medium tank 164 (T2 in FIG. 10) and a control connection 210 for the respective control line.
  • the connections 206 to 210 can be connected through a central bore 212 in the housing 204, in which the shaft part 214 of a control piston 216 is slidably guided and which is sealed off at its end opposite the connection 208 by a flexible membrane 218.
  • the central bore 212 widens to a chamber 220, which is delimited by two annular valve seats 222 and 224, which in turn can be sealed off by the actual piston section 226 of the control piston 216.
  • the control piston 216 is biased by a helical compression spring 228 in the direction of the flexible membrane 218 and thus in the direction of the valve seat 222.
  • the helical compression spring 228 is supported on the one hand on the piston section 226 of the control piston 216 and on the other hand on a shoulder 230 of the valve housing in the region of the connection 208. Pressure on the flexible membrane 218 allows the control piston 216 to be displaced between the two valve seats 222 and 224.
  • control piston 216 In its rest position, the control piston 216 rests on the valve seat 222 and thus closes the connection between the pressure connection 206 and the control connection 210. In the section lying between the two connections 206 and 210, the shaft section of the control piston 216 has a smaller one than the wall of the bore 212 Diameter, but the hydraulically effective areas are the same size, so that the incoming pressure cannot move the control piston in any direction. This position of the control piston 216 is shown in the right half of FIG. 11.
  • the restoring force of the spring 228 must be selected to be relatively high in order to ensure a safe return of the control piston 216 into its position shown in the right half of FIG. 11.
  • the present design of the control valve 202 will provide the holding force required to hold the spool 216 in its down position by hydraulic servo action versus the force initially required to overcome the restoring force of the spring 228 reduced.
  • the difference between the initially required actuating force and the holding force results from the fact that the valve seat 224 has a larger diameter than the valve seat 222.
  • the column base 14 and the column head 16 are not connected to one another by hydraulic lines.
  • the arrangements required for feeding the electric motor 168 of the hydraulic unit 24 can be accommodated, which are connected to the Electric motor 168 are connected via an electrical cable 232.
  • batteries 234 are arranged in the column base, which allow the operating table to be operated independently of the mains.
  • the column base 14 can contain a battery charger (not shown) and a power supply unit (also not shown), which enables the electric motor 168 to be driven directly via the network and to charge the batteries 234.
  • a cable drum 236 for a power cable 238 is arranged in the column base 14.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)
EP84108941A 1983-08-10 1984-07-27 Operationstisch Expired - Lifetime EP0139118B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833328908 DE3328908A1 (de) 1983-08-10 1983-08-10 Operationstisch
DE3328908 1983-08-10

Publications (3)

Publication Number Publication Date
EP0139118A1 EP0139118A1 (de) 1985-05-02
EP0139118B1 EP0139118B1 (de) 1988-03-30
EP0139118B2 true EP0139118B2 (de) 1992-08-12

Family

ID=6206254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84108941A Expired - Lifetime EP0139118B2 (de) 1983-08-10 1984-07-27 Operationstisch

Country Status (6)

Country Link
US (1) US4589642A (enrdf_load_stackoverflow)
EP (1) EP0139118B2 (enrdf_load_stackoverflow)
JP (1) JPS60122562A (enrdf_load_stackoverflow)
DE (2) DE3328908A1 (enrdf_load_stackoverflow)
HU (1) HU189925B (enrdf_load_stackoverflow)
RU (1) RU1787028C (enrdf_load_stackoverflow)

Families Citing this family (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0406462B1 (de) 1989-07-05 1993-10-06 BRUMABA U. Brustmann Behandlungstisch, insbesondere für physikalische Therapie
JPH04183448A (ja) * 1990-11-20 1992-06-30 Toshiba Corp 循環器診断用患者保持台
DE4138318C2 (de) * 1991-11-21 1997-07-10 Stierlen Maquet Ag Operationstisch mit abnehmbarer Patientenlagerfläche
DE4321251A1 (de) * 1993-06-25 1995-01-05 Siemens Ag Medizinisches Gerät mit einer Hydraulikeinheit
DE4341779C2 (de) * 1993-12-08 1995-12-07 Knapp Juergen Michael Hubsäule für ein heb- und senkbares Tragelement, insbesondere für eine Lagerfläche einer Patientenliege oder für industrielle Anwendungen sowie eine Patientenliege mit einer solchen Hubsäule
FR2739093B1 (fr) * 1995-09-21 1999-11-26 Jurgen Michael Knapp Colonne de levage
DE19733177C2 (de) * 1997-07-31 2001-08-09 Siemens Ag Betätigungseinrichtung für einen Patientenlagerungstisch
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Publication number Publication date
HUT35170A (en) 1985-06-28
RU1787028C (ru) 1993-01-07
DE3470117D1 (en) 1988-05-05
DE3328908C2 (enrdf_load_stackoverflow) 1991-01-17
JPH0443670B2 (enrdf_load_stackoverflow) 1992-07-17
DE3328908A1 (de) 1985-02-28
EP0139118A1 (de) 1985-05-02
EP0139118B1 (de) 1988-03-30
JPS60122562A (ja) 1985-07-01
US4589642A (en) 1986-05-20
HU189925B (en) 1986-08-28

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