EP0194206A1 - Vorrichtung zum Anzeigen und zur Überwachung der am Zugarm eines orthopädischen Tisches angreifenden Kraft - Google Patents

Vorrichtung zum Anzeigen und zur Überwachung der am Zugarm eines orthopädischen Tisches angreifenden Kraft Download PDF

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Publication number
EP0194206A1
EP0194206A1 EP86400481A EP86400481A EP0194206A1 EP 0194206 A1 EP0194206 A1 EP 0194206A1 EP 86400481 A EP86400481 A EP 86400481A EP 86400481 A EP86400481 A EP 86400481A EP 0194206 A1 EP0194206 A1 EP 0194206A1
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EP
European Patent Office
Prior art keywords
force
screw
recorded
rotation
electric motor
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.)
Granted
Application number
EP86400481A
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English (en)
French (fr)
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EP0194206B1 (de
Inventor
Georges Gazuit
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.)
MARZET-AUBRY SA
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MARZET-AUBRY SA
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Application filed by MARZET-AUBRY SA filed Critical MARZET-AUBRY SA
Publication of EP0194206A1 publication Critical patent/EP0194206A1/de
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Publication of EP0194206B1 publication Critical patent/EP0194206B1/de
Expired legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H1/00—Apparatus for passive exercising; Vibrating apparatus; Chiropractic devices, e.g. body impacting devices, external devices for briefly extending or aligning unbroken bones
    • A61H1/02—Stretching or bending or torsioning apparatus for exercising
    • A61H1/0218—Drawing-out devices

Definitions

  • the present invention relates to a device for displaying and controlling the force applied to the extension arm of an orthopedic table, allowing the direct reading of the force applied to the extension arm and the constant maintenance of this force whatever the angular position in space of this extension arm, or the dynamic maneuver causing the angular modification of the position of the arm.
  • Orthopedic tables are generally made up of a horizontal or tilting table on which the patient rests, and extendable articulated arms on which his feet are fixed.
  • the articulated arms generally consist of a deformable parallelogram system allowing angular modification in the horizontal and vertical planes.
  • the extension is ensured by a telescopic tube maneuvered by a screw-nut system and a crank.
  • this device has drawbacks which reside in its exclusively manual function, and in the absence of control of the intensity of the force which leads to manual adjustment remaining entirely subjective. Furthermore, there is a variation in the intensity of the applied force, more or less, during the angular maneuver of the arm in the horizontal or vertical planes, this being due to the fact that the axis of articulation of the deformable parallelogram mechanical device does not coincide with the patient's hip joint axis, and it is difficult to constantly readjust the applied force. Furthermore, the implementation of a fully automatic and preprogrammed system is costly and does not allow the practitioner to control and measure the rate of progression of the effort exerted.
  • the object of the device according to the invention is to remedy these drawbacks and to allow operation with manual and automatic phases.
  • a device for displaying and controlling the force applied to the extension arm of an orthopedic table said arm comprising a telescopic tube actuated by a screw and nut system, the screws being able to be driven.
  • an operating member characterized in that a force sensor member is interposed between the tube control screw and a fixed point on the arm, said sensor member being connected to a means for displaying the force F recorded by the sensor member, in that switching means are provided to allow the screw to be driven either manually from said operating member, or automatically from a motor electric and in that it further comprises an electronic circuit ensuring, in the automatic operating position, the comparison of two forces, one of which is the force F recorded by the sensor member and the other is a reference force Fo chosen cbte previously bare in a manual control position of the screw by storing the force recorded by the sensor member before switching to the automatic operating position, said electronic circuit reacting in the automatic operating position to any variation in the force F recorded by the sensor member with respect to the reference force Fo and emitting
  • the electronic circuit is connected to a means for displaying a reference force Fo and to a means for displaying the real force F recorded by the real force sensor member.
  • the electronic circuit comprises a comparator, one of the inputs of which is connected by an amplifier to the sensor element of force and the other input of which is connected to an adjustment potentiometer, said comparator having its output connected on the one hand to a meter and on the other hand to the bases of two transistors which supply respectively two relay coils controlling the selective supply of the electric motor for its rotation in one direction or the other, when the electric motor is put into service by a switch.
  • the circuit advantageously further comprises two transistors oscillating at predetermined frequencies by an adjustment and connected on optocouplers giving a breakdown of the voltage which is applied (in CD and EF) on the base-emitter space of the transistors for modify the reaction time of these transistors.
  • the device comprises a housing on which is fixed, at one of its ends an element of the telescopic tube and in which is rotatably mounted one of the ends of the worm which is connected to a inner sleeve integral in rotation with an outer sleeve but mounted to slide axially relative to the latter, and connected by rolling stops to one end of the force sensor member, the other end of which is fixed to the case, said outer sleeve being rotatably mounted in the case and integral in rotation with a pinion slidably mounted axially on said outer sleeve in order to selectively mesh with a pinion driven in rotation by the electric motor and with a pinion driven in rotation by a manual control unit.
  • the function of supplying the initial traction force to the desired traction force remains manual, but the function of conservation of the desired traction force is made automatic.
  • a sensor measures the intensity of the force which is displayed in direct reading, thus allowing objective adjustment of the desired force, while helping to ensure automatic maintenance of the desired force.
  • the intensity of the force measured by the sensor is slaved to a predetermined reference force so that the control motor of the screw-nut system of the telescopic tube of the extension arm is biased in one direction of rotation or the other according to the comparison of the force indicated by the sensor and the predetermined force, which has been chosen beforehand by the operator.
  • the system automatically regulating the length of the telescopic tube to the length necessary to maintain the force. , and thus compensates for the variation in parallax between the articulation of the extension arm and the articulation of the patient during the operation of the extension arm.
  • FIG. 1 shows a device 10 for displaying and controlling the force applied to the extension arm of an orthopedic table, said arm comprising a telescopic tube 2, 2a composed of an external element 2 and d an internal element 2a actuated by an endless screw 3 which is engaged in a nut 8 integral with the internal part 2a of the telescopic tube which is connected to a part 9 fixed to the patient's foot on which a traction force F is exerted
  • At one end of the endless screw 3 is fixed one of the ends of a force-sensing member 1 or strain gauge, the other end of which is fixed to a fixed point of the extension arm, such that the housing 17 of the control device 10.
  • the force sensor member 1 transmits to a recording member 6 information corresponding to the intensity of the force F.
  • the recording member 6 is connected on the one hand to a first display member 11 of the real force and on the other hand to an electronic circuit 7.
  • the device 10 comprises a control member 5 making it possible to store a reference force value which can be displayed on a second display member 12.
  • the pressure sensor member 1 transmits at any time to the recording member 6 the intensity of the force F acting on the patient's limb.
  • the practitioner can manually pull the patient's leg until the desired force is obtained.
  • the actual force exerted on the patient's leg is displayed at all times on the display member 11 and the practitioner can constantly know the importance of the force exerted.
  • the operator can permanently control and dose the force exerted as well as the speed with which an effort must be gradually exerted.
  • the device according to the invention is placed in an automatic operating position and an automatic control then makes it possible to guarantee that, whatever the patient's movements, the tractive effort chosen by the practitioner will continue to be exercised automatically without modification and without manual intervention.
  • the value of the real force exerted which is recorded at this instant in the recording member 6 and displayed in the display member 11, is recorded in the second recording member 5 and displayed on the second display member 12.
  • the pinion 116 is disengaged so as no longer to be engaged with the pinion 115 secured to the shaft 43 driven by the flywheel 44, and a pinion 16, integral in rotation with the extension of the worm 3 is engaged with a pinion 15 integral with the output shaft of an electric motor 4 which can be rotated in one direction or the other from conductors 13, 14 of motor power control 4.
  • the electronic circuit 7 comprises a comparator circuit to which are applied during the automatic operation of the device, on the one hand a signal emitted by the recording member 5 and representing the value of a reference force corresponding to the value of the force exerted at the level of the sensor 1 when switching from manual operation to automatic operation and on the other hand, a signal enis by the recording member 6 and representing the value of the real force exerted at the instant considered at the level of sensor 1.
  • the pressure sensor member 1 stores in memory 6 the intensity of the force F acting on the patient's limb. Said intensity of the force which appears on the display member 11 is also transmitted to the comparator circuit of the electronic circuit 7, in order to be compared with the value of the reference force stored in memory 5 and displayed in the member 12 display of the reference force. According to the imbalance recorded between the real force and the reference force, the circuit 7 transmits information to the supply circuit of the motor 4 by the line 13 or 14 so that the motor 4 is driven in rotation in one direction or in the other.
  • the motor 4 drives in rotation, by the pinions 15 and 16 the screw 3 which, by acting through the nut 8, causes the telescopic tube 2, 2a to shorten or lengthen.
  • the actual force exerted at point 9 on the patient's limb is increased or decreased.
  • the electronic circuit 7 gives information leading to a rotation of the motor 4 causing a rotation of the control screw 3 in one direction or the other such that the length L is increased or reduced in the direction where the real force tends to become equal to the reference force Fo.
  • FIG. 2 schematically shows the mechanical design of an orthopedic traction device equipped with an electronic tension controller according to the invention.
  • the actual pulling device comprises a support tube 2 which can itself be mounted on another orientable support member, not shown in FIG. 2, and a tube 2a telescopically sliding inside the support tube 2.
  • a control screw 3 is engaged in a nut 8 integral with the inner tube 2a and is extended by a non-threaded part which is engaged in a bearing 33 fitted at the end of the outer tube 2 opposite point 9 of application of the tensile force on the patient's limb.
  • the inner tube 2a which carries the nut 8 and surrounds the screw 3 over part of its length, is moved axially in one direction or the other by sliding in the outer tube 2 to modify the position of point 9 and consequently the traction force.
  • the tension control and display device 10 comprises a molded housing 17 which fits onto the end of the external support tube 2, around the bearing 33 inside which the non-threaded end of the screw 3 journals. .
  • a drive shaft for the screw 3 is mounted on a ball bearing 30 inside a non-rotating frame 127 which receives the axial forces exerted on the screw 3 and supports the end 23 of a strain gauge 1 , or an equivalent force-measuring device, the other end of which is fixed to the housing 17 of the device 10.
  • a pinion 115 is mounted on a sleeve 126 coaxial with the shaft 43 of a flywheel 44, to be driven in rotation with the shaft 43.
  • the sleeve 126 is connected by a member d adaptation 117 to one end of a lever 37 which can pivot around a fixed point 137.
  • a first position of the lever 37 the pinion 115 is engaged with a pinion 16 mounted on a non-threaded part of the screw 3.
  • the screw 3 can be rotated by the flywheel 44.
  • a second position of the lever 37 which corresponds to the position shown in FIG. 4, the pinion 115 is no longer engaged with the pinion 16 and a contact 107 makes it possible to energize a gear motor 4 which then controls the rotation of the screw 3 by means of a set of pinions 15, 16.
  • the electric motor 4 is controlled by electronic circuits 7 incorporated in the housing 17 and the device is set to the automatic display voltage maintenance position.
  • the members 11, 12 for displaying the real force applied to the patient's limb and the reference force chosen when switching from the manual position to the automatic position can be arranged for example on a side face of the housing 17, or on the upper face of the housing 17.
  • the control device makes it possible to carry out a direct reading of the force exerted during the entire manual phase during which traction is carried out on the patient's leg up to the desired force.
  • the handle 37 Once the traction force has been reached, the handle 37 being placed in the automatic position, the electronic controller is in action and the traction force exerted is controlled to remain constant even if the position of the patient undergoes certain modifications.
  • the display members 11, 12 make it possible to read at all times the reference value and the real measured force which is adapted using the control device to be brought back to the reference value.
  • FIG. 5 shows a particular embodiment of the mechanical arrangement of a control device according to the invention.
  • the end 18 of the fixed element 2 of the telescopic tube 2, 2a is fitted and fixed by locking screws 19 on the casing 17 of cast aluminum.
  • the pressure sensor member 1 Inside the housing 17 is arranged the pressure sensor member 1, one of the ends of which is fixed by a pin 20 in two housings 21, 21a of a washer 22 secured to the housing.
  • the sensor member 1 is provided with a rod 23 which has a head 23a resting against two thrust ball bearings 24, 24a separated by a spacer 25 and kept tight by a nut 26 screwed onto the threaded part 23b of the rod 23, the stops 24, 24a thus being made integral with an inner sleeve 27 integral in rotation with an outer sleeve 28 by a key 29 allowing the axial sliding of the sleeve 27 in the sleeve 28.
  • the outer sleeve 28 is rotatably mounted by means of a ball bearing 30 and a needle bearing 31 in the housing 17.
  • the inner sleeve 27 is made integral in rotation with the extension 3a of the screw 3 by a key 32, said screw 3 being engaged in a bearing 33 fitted at one of the ends of the fixed element 2 of the telescopic tube 2, 2a.
  • a pinion 34 which is integral in rotation with said sleeve in particular by a key, said pinion being subjected to the action of a helical spring 35 bearing against a shoulder of the sleeve 28 and being capable of sliding against the action of the spring under the action of a finger 36 of a selector rotatably mounted on one of the side covers 38, 38a closing the housing 17.
  • the selector 36 is actuated from the outside by a lever 37 (fig 6).
  • the pinion 34 is capable of meshing either with a pinion 39 keyed onto the output shaft 40 of the motor 4 fixed inside the housing 17 by means of a fixing bracket 41, or with a pinion 42 fixed to the end of a shaft 43 rotatably mounted in the housing 17 and provided at one of its ends with an operating wheel 44.
  • the electric control circuit for controlling the motor 4 or motor-reducer and the electronic circuit 7 for measuring the intensity of the force.
  • FIG. 7 A possible embodiment of the electronic circuit 7 is shown in FIG. 7.
  • the force sensor or gauge member 1 is connected via an amplifier 45 and a resistor 71, connected in series to the output of the amplifier 45, to one of the inputs 46 of a comparator circuit 47, the other input 48 of which is connected, via a resistor 72, to an adjustment potentiometer 49.
  • Resistors 75, 76, 77 allow the parameters of the comparator circuit 47 to be adjusted.
  • Two diodes 73, 74 are furthermore mounted in parallel between the inputs 46 and 48 of comparator 47, the cathode of each of the diodes being connected to the anode of the other diode.
  • the output 50 of the comparator 47 is connected, via the series circuit composed of a zener diode 78 and a resistor 79, to the base of a transistor 51, the collector of which is mounted in series with a contact b 2 of a second relay 54 and with the coil B 1 of a first relay 53, it itself mounted in parallel with a protective diode 82.
  • the output of the comparator 47 is connected, by means of the circuit series composed of a Zener diode 80 and a resistor 81, at the base of a second transistor 52, of a type complementary to that of transistor 51 and the collector of which is mounted in series with a contact bl of the first relay 53 and with the coil B 2 of the second relay 54, itself mounted in parallel with a protection diode 83.
  • the actual force applied by means of the screw 3 to the patient's leg is determined by the force sensor member 1 which delivers at the output of the amplifier 45 a voltage proportional to the actual force exerted. This voltage is applied to the first input 46 of the comparator 47, the second input of which is connected to the potentiometer 49.
  • the voltage supplied on the input 46 of the comparator represents the real force gradually exerted manually on the patient's leg.
  • This voltage makes it possible to display a value of actual force exerted on a display member, such as the display member 11 in FIG. 1.
  • the potentiometer 49 is adjusted so as to indicate a zero value on the voltmeter or vumeter 55 with high impedance placed between the output of the comparator 47 and the cursor of the potentiometer 49.
  • the vumeter 55 is at zero, there is a balance of the voltages on the inputs 46 and 48 of the comparator 47. This means that the reference voltage has been chosen equal to the value of the real force reached at the end of the manual phase.
  • the flywheel 44 After switching to automatic operation using the lever 37 of Figure 6, the flywheel 44 is disengaged, the motor 4 is engaged with the screw 3, and the switch 92 is closed.
  • the force sensor member 1 delivers a new voltage such that the balance between the two voltages at the terminals of the meter 55 is broken.
  • the new value of the voltage on the input 46 of the comparator 47 modifies the output voltage of the comparator 47 which supplies a voltage by tilting either on the transistor 51 or on the transistor 52, thus causing a supply of the motor 4 by the relay. 53 or the relay 54 and consequently a rotation of the motor in one direction or the other.
  • the direction of rotation of the motor is such that the voltage recorded by the gauge 1 tends to return to its initial position such that the meter 55 returns to its equilibrium position indicating zero.
  • an electrical device for adjusting the reaction speed of the transistors 51 and 52 of FIG. 7 is used.
  • Transistors 56, 57 the collectors of which are connected by polarization resistors 89, 90 to the + V supply line, oscillate at predetermined frequencies by a circuit comprising a potentiometer 58 and capacitors 61, 62.
  • the capacitor 61 is connected between the collector of transistor 57 and the collector of transistor 56 while the capacitor 62 is connected between the base of transistor 57 and the collector of transistor 56.
  • the potentiometer 58 mounted between the bases of the transistors 56, 57 has its cursor connected to a divider bridge formed by resistors 87, 88 connected between the supply + V and the ground.
  • the collector of transistor 57 is connected to two optocouplers 59, 60 connected in series with a resistor 91.
  • the optocouplers carry out a voltage cutting between on the one hand the terminals c and d and on the other hand the terminals e and f of the circuit of FIG. 7, which modifies the reaction times of the transistors 51 and 52.
  • the potentiometer 58 allows manual adjustment of the reaction speed of the transistors 51, 52.

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  • Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Pain & Pain Management (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Rehabilitation Therapy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Rehabilitation Tools (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Transmission Devices (AREA)
EP19860400481 1985-03-08 1986-03-07 Vorrichtung zum Anzeigen und zur Überwachung der am Zugarm eines orthopädischen Tisches angreifenden Kraft Expired EP0194206B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8503460A FR2578418B1 (fr) 1985-03-08 1985-03-08 Dispositif d'affichage et de controle de la force appliquee sur le bras d'extension d'une table orthopedique
FR8503460 1985-03-08

Publications (2)

Publication Number Publication Date
EP0194206A1 true EP0194206A1 (de) 1986-09-10
EP0194206B1 EP0194206B1 (de) 1989-02-01

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Application Number Title Priority Date Filing Date
EP19860400481 Expired EP0194206B1 (de) 1985-03-08 1986-03-07 Vorrichtung zum Anzeigen und zur Überwachung der am Zugarm eines orthopädischen Tisches angreifenden Kraft

Country Status (4)

Country Link
EP (1) EP0194206B1 (de)
DE (1) DE3661984D1 (de)
ES (1) ES8706025A1 (de)
FR (1) FR2578418B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1626320A1 (de) * 2003-05-22 2006-02-15 Mamoru Mitsuishi Servohilfesteuereinrichtung und -verfahren und umpositionierungseinrichtung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107412909B (zh) * 2017-09-05 2020-10-02 马鞍山欧格萨斯机械科技有限公司 一种肌无力病人用辅助输液器具

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB537653A (en) * 1939-11-28 1941-07-01 James Wolfe Alexander Improvements relating to metal testing machines
FR2210287A5 (de) * 1972-12-07 1974-07-05 Creusot Loire
US3952235A (en) * 1974-06-10 1976-04-20 Tru-Eze Manufacturing Co., Inc. Control system for electrodynamic mechanism
FR2367483A1 (fr) * 1976-10-15 1978-05-12 Enraf Nonius Appareil de traction pour applications medicales
US4365623A (en) * 1980-03-06 1982-12-28 Tru-Eze Manufacturing Co. Apparatus to exert traction in traction therapy

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB537653A (en) * 1939-11-28 1941-07-01 James Wolfe Alexander Improvements relating to metal testing machines
FR2210287A5 (de) * 1972-12-07 1974-07-05 Creusot Loire
US3952235A (en) * 1974-06-10 1976-04-20 Tru-Eze Manufacturing Co., Inc. Control system for electrodynamic mechanism
FR2367483A1 (fr) * 1976-10-15 1978-05-12 Enraf Nonius Appareil de traction pour applications medicales
US4365623A (en) * 1980-03-06 1982-12-28 Tru-Eze Manufacturing Co. Apparatus to exert traction in traction therapy

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1626320A1 (de) * 2003-05-22 2006-02-15 Mamoru Mitsuishi Servohilfesteuereinrichtung und -verfahren und umpositionierungseinrichtung
EP1626320A4 (de) * 2003-05-22 2009-07-08 Mamoru Mitsuishi Servohilfesteuereinrichtung und -verfahren und umpositionierungseinrichtung
US7878992B2 (en) 2003-05-22 2011-02-01 Mamoru Mitsuishi Power assistance controlling apparatus, power assistance controlling method, and physiotherapy apparatus

Also Published As

Publication number Publication date
FR2578418A1 (fr) 1986-09-12
FR2578418B1 (fr) 1989-04-21
ES8706025A1 (es) 1987-06-01
ES552795A0 (es) 1987-06-01
EP0194206B1 (de) 1989-02-01
DE3661984D1 (en) 1989-03-09

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