WO1995022745A1 - Procede de mesure sans contact de mouvements de translation et dispositif fonctionnant selon ce procede - Google Patents

Procede de mesure sans contact de mouvements de translation et dispositif fonctionnant selon ce procede Download PDF

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Publication number
WO1995022745A1
WO1995022745A1 PCT/EP1995/000572 EP9500572W WO9522745A1 WO 1995022745 A1 WO1995022745 A1 WO 1995022745A1 EP 9500572 W EP9500572 W EP 9500572W WO 9522745 A1 WO9522745 A1 WO 9522745A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring device
translational motion
net
contact
motion measuring
Prior art date
Application number
PCT/EP1995/000572
Other languages
German (de)
English (en)
Inventor
Jörg-Roger Peters
Original Assignee
Opton Feintechnik 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 Opton Feintechnik Gmbh filed Critical Opton Feintechnik Gmbh
Priority to EP95910494A priority Critical patent/EP0699298A1/fr
Publication of WO1995022745A1 publication Critical patent/WO1995022745A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
    • A61M5/14276—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body specially adapted for implantation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/39—Scanning a visible indication of the measured value and reproducing this indication at the remote place, e.g. on the screen of a cathode ray tube
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
    • G01F23/16—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid
    • G01F23/164—Indicating, recording, or alarm devices being actuated by mechanical or fluid means, e.g. using gas, mercury, or a diaphragm as transmitting element, or by a column of liquid using a diaphragm, bellow as transmitting element

Definitions

  • the invention relates to a method for a non-contact translational motion measuring device and a motion measuring device operating according to the method.
  • a liquid level indicator is known from US Pat. No. 4,457,171, in which a moving magnet influences a display array. This arrangement of many elements is very space-intensive.
  • a rotation angle sensor is known from US Pat. No. 4,380,928. The patent specification does not show how such a sensor could be used in a translatory motion measuring device.
  • a KM 110 B H / 21 sensor module for angle measurements is known from Philips. The product description does not show how such a sensor module could be used in a translational motion measuring device.
  • the sensor is advantageously fixedly oriented relative to the second element in order to enable a clear evaluation at every position of the second element.
  • the axis of rotation of the second element should be oriented perpendicular to the translatory axis of movement of the first element in order to obtain a maximum signal level (rotational movement) on the second element. This is supported by an orientation of the field lines of the first field-generating element oriented perpendicular to the translatory direction of movement.
  • the first and the second element should each be a magnet.
  • the second magnet Since the second magnet is supposed to rotate, a circular-cylindrical or spherical shape is advantageous for it. If the second magnet is a permanent magnet, it also has no additional external energy requirement.
  • the senor is advantageously a magnetic field sensor.
  • sensors e.g. optical scanners, frequency changers, etc.
  • the measuring device is advantageously used for level measurement, particularly in spatially confined housings.
  • the first element Since the first element is lighter, it should be moved in a translatory manner. The distance between the two elements should be as small as possible in order to obtain a good coupling between them due to the field strength.
  • a preferred area of application is the installation of the measuring device in an implantable infusion pump because of the low energy requirement and the resulting long period of use, the first element advantageously being attached to the bellows.
  • Figure 1 shows an infusion pump (3) in section, in which the motion measuring device according to the invention can be used for level measurement.
  • Implantable infusion pumps (3) which are implanted in the body of a patient are already known and are used in many areas of medicine today.
  • Implantable infusion pumps (3) also called medication pumps, enable direct, continuous medication administration into the arterial or venous system, as well as into the epidual or intraspiral space of the human body.
  • This type of medication allows such a low dose (0.5 to 1.5 ml / day) that the patient's quality of life is largely preserved and stressful side effects on the organism are considerably alleviated, as is known with conventional therapies (tablets, drops, Injection, etc.).
  • the infusion pump (3) shown in Figure 1 consists of a bellows (1), the content of which forms the medicament reservoir or chamber.
  • the bellows (1) of the medication reservoir is accessible via a silicone stopper (2), which forms an essential part of the septum (11).
  • the version of the septum (11) is designed as a dome shape according to the known prior art. This makes it possible to feel the septum (11) later through the skin and the underlying fatty tissue. After the doctor has felt the septum (11), the filling syringe can be attached. The syringe is pierced through the skin, adipose tissue and silicone stopper (2) of the septum (11). A needle stop (4) serves as a stop.
  • the bellows (1) of the medicament chamber (the inside of the bellows) can be filled in this way. The bellows (1) expands.
  • the outside of the bellows (1) lies in a pressure-tight box (5), in which there is a gas (6) which generates a constant counterpressure which is independent of the volume.
  • This counterpressure in turn now tries the medication from the storage chamber Expel the bellows (1) again.
  • the flow of the outflowing medication is limited via a throttle section (7), so that a constant flow rate is established.
  • the medication is guided through a chamber (8), which is accessible via an additional bolus septum (12), and from there it passes out of the pump (3) via the catheter (10) to the site of action in the patient's body.
  • Drugs or contrast media can be injected directly into the catheter (10) and thus to the site of action, bypassing the actual pump (3), via the bolus septum (12) with its silicone stopper (9).
  • the bolus septum (12) is also dome-shaped according to the known state of the art and is palpated.
  • a suitable measuring device In order to measure the level of the bellows (1) in an implanted infusion pump (3), a suitable measuring device is required. Due to the limited space in the infusion pump (3), this device must be characterized by the smallest possible construction. In addition, the device must be characterized by the positional independence of the measured value acquisition, since accurate measurements can be made in each
  • the measuring device according to the invention essentially consists of two physically separate elements.
  • the first element is a permanent magnet (13), which creates a permanent field in its environment.
  • the permanent magnet (13) is attached below the bellows (1) on its lateral edge. When the level of the bellows (1) changes, the permanent magnet (13) moves along a line.
  • the shape of the permanent magnet (13) corresponds to a flat plate, the permanent magnet (13) with its largest surface being attached (e.g. glued) to the bellows (1).
  • the permanent magnet (13) shown in FIGS. 2a and 2b has a rectangular shape. This shape can be varied so that the shape of the permanent magnet (13) is easily adapted to the space inside the arrangement in which it is located (in this case the pressure chamber around the bellows (1) inside the infusion pump (3)) becomes. It is only necessary to ensure that the field strength emanating from the first element has a strength sufficient for the measurement conditions.
  • a partition (5) is closed, the second element of the measuring device according to the invention is arranged to the side of the partition (5) outside the pressure chamber.
  • This second element which can also be referred to as a detection element, essentially consists of two parts.
  • the first part of the detection element (15) forms a rotatably mounted second magnet (14).
  • this second magnet (14) is a permanent magnet.
  • This second permanent magnet (14) is arranged so that it can be easily rotated in a holder (15) and is aligned in such a way that the movement of the first permanent magnet (13) in the translatory direction (16a) leads to a rotary movement (16b) of the second permanent magnet (14) .
  • This rotational movement of the second permanent magnet (14) is detected by a sensor (18) which generates an electrical signal corresponding to the position of the second permanent magnet (14).
  • This electrical signal is then sent to a data line (19) which is connected to a signal evaluation device (not shown in the figures).
  • the sensor (18) is a magnetic field sensor.
  • the measuring device is thus a mechanical-electrical converter.
  • the sensor (18) is controlled by the rotatably mounted second permanent magnet (14) in such a way that the angular position of the rotatably mounted permanent magnet (14) leads to an electrical output signal of the magnetic field sensor (18).
  • the angular position of the second rotatably mounted magnet (14) is changed by the first magnet (13) attached to the bellows (1) of the infusion pump (3), each angular position of the second magnet (14) having a certain filling level in the bellows (i ) corresponds. This is because
  • the translational movement is converted into a rotational movement by changing the direction of the magnetic extraction forces.
  • the particular advantage that is obtained is that the sensor signal does not depend on the strength of the magnetic field but on the angle between the two magnets (13, 14), so that the possible influence by external fields is extremely low .
  • a particular advantage of the motion measuring device, consisting of the first magnet (13), the second, rotatably mounted magnet (14) and the magnetic field sensor (18), can be seen in the fact that, with a small construction volume, the measurement by an amagnetic partition ( The uncritical measuring distances are dependent on the magnet.
  • the magnetic flux density in the respective measuring arrangement must be selected such that the first magnet (13) causes a corresponding movement of the second magnet (14) with each movement.
  • FIGS. 3a-c show a further design variant of the second magnet with a magnetic field sensor.
  • This detection element consists of an amagnetic housing (20) in which a magnetic field sensor (25) is secured in position by an amagnetic screw (27).
  • the housing (20) also has an opening (23) in which a rotatably mounted round permanent magnet (21) is located. Inside this circular cylindrical magnet (21) there is a circular bearing spindle (22), the ends of which taper to a point. The pointed ends of the bearing spindle (22) protrude into two screws (24), each of which has a bearing body (24a). This bearing body (24a) has towards the bearing spindle (22)
  • the invention is not limited to the examples described, but encompasses all non-contact translatory motion measuring devices in which a translatory motion is converted into a rotary motion at least essentially by switching on fields and this rotary motion is then detected by a sensor.
  • the use of the invention in an infusion pump is only a very advantageous one, since the measuring device, because of its compactness and advantages, delivers very good results there.

Abstract

L'invention concerne un procédé de mesure sans contact de mouvements de translation et un dispositif de mesure de mouvement fonctionnant selon ce procédé. Ledit procédé de mesure sans contact consiste à convertir le mouvement de translation en un mouvement de rotation au moins essentiellement en générant un champ au minimum, et à utiliser ce mouvement de rotation pour générer un signal de sortie pouvant être traité ultérieurement. Il se produit ainsi, dans le dispositif de mesure selon l'invention, un mouvement relatif entre un élément générant un champ et une unité de détection. L'élément de détection de l'unité de détection est constitué d'un second élément monté rotatif, soumis à un changement d'orientation autour d'un axe de rotation, sous l'action d'un mouvement du champ du premier élément. L'unité de détection comprend en outre un capteur qui détecte la rotation du second élément et convertit le mouvement de rotation du second élément en un signal de sortie pouvant être traité ultérieurement.
PCT/EP1995/000572 1994-02-17 1995-02-16 Procede de mesure sans contact de mouvements de translation et dispositif fonctionnant selon ce procede WO1995022745A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95910494A EP0699298A1 (fr) 1994-02-17 1995-02-16 Procede de mesure sans contact de mouvements de translation et dispositif fonctionnant selon ce procede

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4405043.7 1994-02-17
DE19944405043 DE4405043A1 (de) 1994-02-17 1994-02-17 Verfahren für eine berührungslose translatorische Bewegungsmeßeinrichtung sowie eine nach dem Verfahren arbeitende Einrichtung

Publications (1)

Publication Number Publication Date
WO1995022745A1 true WO1995022745A1 (fr) 1995-08-24

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ID=6510470

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/000572 WO1995022745A1 (fr) 1994-02-17 1995-02-16 Procede de mesure sans contact de mouvements de translation et dispositif fonctionnant selon ce procede

Country Status (3)

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EP (1) EP0699298A1 (fr)
DE (1) DE4405043A1 (fr)
WO (1) WO1995022745A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5810015A (en) * 1995-09-01 1998-09-22 Strato/Infusaid, Inc. Power supply for implantable device
EP1260244B1 (fr) * 1997-12-31 2006-04-12 ALZA Corporation Mèthode de surveillance de dispositif osmotique de l'administration de medicament

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4715852A (en) * 1986-07-21 1987-12-29 Eaton Corporation Implanted medication infusion device
EP0449270A1 (fr) * 1990-03-28 1991-10-02 Fischer & Porter GmbH Dispositif de mesure du débit d'un fluide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4715852A (en) * 1986-07-21 1987-12-29 Eaton Corporation Implanted medication infusion device
EP0449270A1 (fr) * 1990-03-28 1991-10-02 Fischer & Porter GmbH Dispositif de mesure du débit d'un fluide

Also Published As

Publication number Publication date
EP0699298A1 (fr) 1996-03-06
DE4405043A1 (de) 1995-08-24

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