EP2536952B1 - Safety device for a peristaltic pump - Google Patents

Description

Field of the invention:

The invention relates to a hose roller pump with interchangeable rotors, in particular for a dialysis.

State of the art:

Hose roller pumps are used for the occlusive conveying of liquids and are frequently used, for example, in laboratories, small-scale production plants, analyzers, infusion pumps and in particular also in dialysis facilities. They have a stator and a rotor revolving therein with at least two squeezing rollers, which occlude a delivery hose inserted between the stator and the rotor and thus drive a liquid present in the delivery hose.

In such hose roller pumps, it is usually possible to separate the rotor, for example, for the purpose of cleaning, repair or replacement of the rotor to adapt to different tube materials, diameters and / or wall thicknesses of the rotor mount, for example, the pressure springs for the squeezing rollers of the rotor or to replace the rotor with another rotor design. In addition, many hose reel pumps - especially those used in laboratories, small-scale production facilities, analyzers and dialyzers - have multiple conveyors with interchangeable rotors, however can have different properties. These properties may depend, for example, on the delivery hoses used, other components in the delivery flow of the hose roller pump, the viscosity of the medium to be delivered, the desired delivery pressures and other parameters.

With a closure of the tube or an increase in the volume resistance downstream of the pump, the pressure in the hose increases very rapidly with further operation of the hose roller pump and would inevitably without further security precautions to damage the hose or other components connected to the hose, such as filters, membranes, Dialyzers or drip chambers lead.

In order to counteract such damage, for example, the pinch rollers of the rotor can be mounted resiliently perpendicular to the direction of rotation, so that they yield to a pressure building up in the hose. The spring constant of the storage determines the maximum occlusion pressure and thus limits the delivery pressure of the hose roller pump. This can be technically realized, for example, by virtue of the fact that the rotor has two arms which can be displaced parallel to one another in a spring-like manner, at the ends of which the pinch rollers are rotatably mounted.

The spring constant of the rotors can be different, for example, in hose roller pumps for dialyzers for the pumped liquid, the inserted hose set with the delivery hose, other components used (such as filters, membranes, dialyzers, membranes and / or drip chambers) and the type of treatment. Thus, for example, the rotor of the hose roller pump of a dialysis device for the substituate solution can be equipped with a lower spring force, that is also with a lower maximum occlusion pressure, than, for example, the rotor of the blood pump. Constructively, the conveyors of the tube roller pumps are otherwise identical, so that each rotor can be inserted into each stator.

During the cleaning and disinfection of the dialysis device, the rotors of the pumps are now removed from the stators to better the dialyzer and the rotors to be able to disinfect. In order to identify the stators and to install the right rotor in the respective conveyor, the rotors are usually provided in the prior art with stickers, but which can peel off over time. Even if the sticker is intact, there is a risk of human error when upgrading, if the label or marking on the stickers is not read correctly and therefore not on the inserted tube set, the components used (such as filters, membranes, dialyzers and / or drip chambers) and the type of treatment is adjusted. There is thus the risk that after disinfection of the device rotors are confused, so for example rotors are loaded with wrong roller spring force in the respective conveyor, or forgotten, for example, when changing the type of treatment, the replacement of the rotors. This can lead not only to the damage of components of the dialysis, but also to poor treatment results and endangerment of health or life of the patient. Please refer DE3726452 A1 , with the next state of the art.

Disclosure of the invention:

It is therefore an object of the present invention to ensure the correct placement of the dialysis with rotors of the right type and in particular the correct spring force in the respective conveyor and reliably exclude a Fehlaufrüstung the dialyzer under all circumstances.

This object is achieved by a hose reel pump according to claim 1. Preferred embodiments are specified in the subclaims.

According to the present invention, a hose reel pump, preferably for a dialysis device, is provided with a rotor receptacle, a rotor which can be connected to the rotor receptacle and preferably has a plurality of marking devices, by the nature and / or arrangement of which at least one property of the rotor is coded , and a safety device with at least one detection device, by means of which the at least one characteristic of the rotor coded by the marking device (s) can be controlled, wherein the Safety device can be activated depending on at least one of these properties of the rotor.

By such a hose reel pump as set forth in claim 1, it is possible to automatically control, for example, the rotor type or setting of the rotor or at least one property of the rotor mounted in a conveyor of the hose roller pump by means of the at least one detecting device of the safety device and in case a faulty upgrade to activate the safety device and thus trigger a suitable action. In addition, it is technically easy to integrate such detection devices firmly in the rotor or to connect captive with this. Another conceivable possibility would be to attach, for example, such a detection device to an adjusting element of the pressure spring, wherein the detection of the position of this detection device, the bias and thus the pressing force of the adjusting spring and thus the occlusion pressure can be controlled automatically. Even in routine operation by poorly trained personnel or in hectic hospital situations can be reliably ruled out a misadministration of the conveyors.

In a preferred embodiment, when the tube roller pump is put into operation with a rotor having incorrect or unsuitable properties, the tube roller pump can be deactivated by the safety device and / or a warning signal can be triggered. This makes it immediately possible - in addition to, for example, a limitation of the operating conditions of the hose reel pump to safe values (eg only commissioning of the engine in creep mode for venting or testing of the system) or a likewise conceivable logging of the rotor assembly - any operation of the hose reel pump, for example after one or to prevent a few revolutions of the rotor. In this case, a rotor with incorrect or unsuitable properties is understood to mean a rotor which does not comply with the requirements of the particular application with regard to its type, its setting (in the case of a rotor with adjustable pressure force, for example) or at least one rotor characteristic. For example, it is possible that the actual value of the at least one property of the rotor does not match that for the operating conditions required or optimal setpoint coincides, or that the actual value of the at least one property of the rotor is not within a predetermined value range for the operating conditions. It is conceivable, for example, in the case of a hose roller pump for a dialysis, that in view of the operating conditions in addition also other factors, such as the mode of the hose roller pump, the properties of used components - especially of hoses, filters, membrane devices and / or other rotors - Work programs and / or other data - especially treatment and / or patient data - be considered. As a result, a maximum of security can be ensured.

In a further preferred embodiment, the marking device (s) may be arranged with respect to the rotor so that it is guided past the at least one detection device during rotation of the rotor and thereby a signal pattern is generated by the at least one detection device, through which the at least one property of the rotor can be detected. This represents a technically particularly advantageous development of the tube roller pump, in which, with recourse to a few simple, reliable sensors (without, for example, the use of imaging methods or pattern recognition), the at least one property of the rotor can be detected. After just one or a few revolutions of the rotor, the safety device can be triggered in the event of incorrect assembly and the continued operation of the hose roller pump can be prevented as early as possible.

In a further preferred embodiment, the signal pattern of the at least one detection device can be evaluated with reference to a rotational speed signal of a hose roller pump drive. In this case, a drive signal of a stepping motor, a motor-own speed signal generated by the commutator, for example, or generated by a separate speed sensor, a generator signal or any other rotational speed signal can be used as the rotational speed signal. This makes it possible, for example, the angular distance between two marking devices independent of speed to detect precisely or the extension of a To detect marking device and to differentiate between different dimensions of marking devices.

In a further preferred embodiment, each of the marking devices may be detected by at least two detection devices each revolution. This represents a further possibility, for example, to determine the rotational speed of the rotor and thereby, for example, to precisely detect the angular distance between two marking devices independently of the rotational speed or to detect the extent of a marking device and thus to differentiate between different dimensions of marking devices.

In a further preferred embodiment, the speed and / or direction of rotation of the rotor can also be determined from the signal pattern of the at least one detection device. If, for example, only one marking device or only one marking device of a certain type or several marking devices is distributed over a rotation angle range of less than 180 ° at a certain distance from the rotation axis, then the same detection devices are used for the detection and control of the at least one property of the rotor are responsible, at the same time also include the rotational speed and, if appropriate arrangement of the marking devices also the direction of rotation of the rotor.

In a further preferred embodiment, the marking device (s) can be detected without contact magnetically, electromagnetically and / or optically. This ensures a particularly reliable and trouble-free operation and a similar detection of the marking devices.

In a further preferred embodiment, at least one of the detection devices may comprise a magnetic field sensor, preferably a Hall sensor. This represents a particularly advantageous and reliable embodiment for a detection device that operates moisture and pollution independent and it for example, allows to mount small permanent magnets on or in the rotor as marking devices.

In a further preferred embodiment, at least one of the detection devices may have a preferably electromagnetic or inductive proximity sensor. For example, by induction of eddy currents, tuning circuit by changing the inductance, but also by capacitance change or optical measurements (IR reflectivity changes), the marking devices can be detected easily and reliably.

In a further preferred embodiment, at least one marking device may comprise a transponder device. In this transponder device may be preferably an RFID transponder ( "R adio- F requency ID entification" transponder) or RFID act chip. As a result, a plurality or a multiplicity of information of the rotor can be reliably and inexpensively transmitted by a single marking device. Thus, it is possible, for example, to store and read out several properties (eg occlusion pressure, properties of the pressure roller (such as width, shape, material), number of pressure rollers), but also in addition an individual rotor ID or manufacturing data or operating times of the rotor.

In a further preferred embodiment, the marking device (s) can be arranged at different distances from the axis of rotation of the rotor receptacle. As a result, the number of coding options, for example, for properties of the rotor or other information such as speed and / or direction of rotation can be easily expanded. In addition, so the marking devices can be arranged more advantageous even with narrow rotor arms and the detection accuracy can be increased even with simple and inexpensive detection devices.

In a further preferred embodiment, by the safety device, the at least one property of the rotor taking into account properties of other components - in particular of hoses, filter, membrane devices, dialyzers and / or further rotors and / or work programs and / or other data - in particular treatment and / or patient data - are evaluated. In this way, a large number of parameters relevant to the correct selection of the rotor can be taken into account, thus ensuring maximum safety and flexibility. For example, it is technically possible to identify and automatically detect other components which are arranged in the fluid circuit of the dialysis system, likewise by means of suitable marking devices; likewise, the operating mode of the dialysis device can be taken into account. Treatment and / or patient data could, for example, be read out and transferred from a computer system, possibly in alignment with a patient chip card or another identification or storage system. It would also be conceivable to read data from a barcode of a patient file or index card in order to take into account, for example, patient data, information about the course of treatment, type of dialysis, replacement membranes used, ultrafiltration fluid, substituate solution, flow rates, treatment durations. This could possibly lead to the entire programming and control of the dialysis machine being made automatable.

The invention is not limited by the specific embodiments; the features of all the aforementioned embodiments are - as far as they do not exclude each other technically or adversely affect freely combined with each other.

Description of the figures:

• Fig. 1 die schematische Darstellung eines in einem Stator umlaufenden Rotors einer Fördereinrichtung einer Schlauchrollenpumpe,
• Fig. 2 die schematische Darstellung der Signalverläufe von Näherungssensor 1, Näherungssensor 2 und Näherungssensor 3,
• Fig. 3 die schematische Darstellung der Signalverläufe des Hall-Sensors in einem zweiten Ausführungsbeispiel,

With reference to the drawings, two embodiments of the invention are explained in detail below. Show it:

• Fig. 1 1 is a schematic representation of a rotor revolving in a stator of a conveyor of a hose reel pump,
• Fig. 2 the schematic representation of the waveforms of proximity sensor 1, proximity sensor 2 and proximity sensor 3,
• Fig. 3 the schematic representation of the waveforms of the Hall sensor in a second embodiment,

FIG. 1 shows the schematic representation of a rotating in a stator (1) rotor (2) of a conveyor of a hose roller pump. The rotor (2) sits (releasably connected) on the rotor (2) bearing rotor receptacle which rotates about the axis of rotation (3) and drives the rotor (2). The rotor (2) has two substantially radially displaceable rotor rolls (5) provided with pinch rollers (or pressure rollers) on one side and having a defined spring force of a spring (not shown here) in the direction of the pinch rollers (4). The conveying hose, which is likewise not shown here, lies against the inside of the wall of the stator (1) and is occluded by the spring-loaded squeezing rollers (4), thus driving and conveying a liquid in the conveying hose in a known manner.

At three different distances from the axis of rotation (3) are on both sides thereof on both sections of the two rotor arms (4) a total of 2 x 2 x 3 = 12 marking holes or Markseintiefungen (6, 7), which can accommodate marking devices and by casting with a potting compound permanently hermetically sealed. Some of these marking indentations (6) contain as marking devices electrically conductive metal plates or inlays (e.g., copper, iron or aluminum plates; black filled circles), other marking indentations (7) contain no marking devices (open circles). S1, S2 and S3 (S = sensor) symbolize inductive proximity sensors (8, 9, 10), which are arranged in the rear wall of the stator (1) near the stator surface.

Due to the rotation of the pump rotor, the metal plates are periodically brought into the magnetic field of the proximity sensors (8, 9, 10). In this case, eddy currents are induced in the metal plates moving in the magnetic field, energy being withdrawn from the magnetic field, which in turn can be detected in the power consumption of the proximity sensors (8, 9, 10).

The number and the geometric distribution of the electrically conductive plates can now code different features of the rotor (2). In addition, it is possible to use a transient sensor signal to detect a full revolution and thus to detect the rotational speed and the time in which the remaining sensor signals are completely applied. In FIG. 2 For example, the signal S3 in the transient signal waveform shown below serves to detect the rotor revolutions, wherein FIG. 2 is triggered on the rising edge of the sensor signals. S1 and S2 encode in their transient course a relevant feature of the rotor. The number of sensors and metal plates in FIG. 1 are chosen arbitrarily.

In another embodiment, not shown, each rotor is equipped with at least one magnet for detecting the direction of rotation. By two Hall sensors connected in series in the rear wall of the stator and the temporal evaluation, which detects the two Hall sensor first the magnet, the direction of rotation is detected. At constant rotation speed, the width of the magnet can be determined by a Hall sensor.

A specific simplified embodiment results if the pump drive has a tachometer output that generates a fixed number of pulses per rotor revolution. In the case of magnets of different widths, changes take place here - as in FIG. 3 shown - the number of tacho pulses when moving over the magnet and can thus be used to detect the magnet width.

In that FIG. 3 underlying embodiment, the rotor 1 has a wider magnet in the rotor than the rotor 2 and can be detected by detecting the number of Tachopulse when driving over the magnet.

The monitoring of the rotors can be active during the entire running time of the machine, depending on the selected treatment method. It makes sense, however, immediately after the upgrade, ie, for example, when filling the hose system, the test is performed. In this way, the user can then on time before the start of treatment on be pointed out a loading of the conveyor with a wrong or unsuitable rotor.

LIST OF REFERENCE NUMBERS

1.

stator

Second

rotor

Third

axis of rotation

4th

squeegee

5th

rotor arm

6th

Marker recess with marker device

7th

Marking recess without marking device

8th.

Proximity sensor S1

9th

Proximity sensor S2

10th

Proximity sensor S3

Claims (14)

1. Peristaltic pump, preferably for a dialysis device, having
   a rotor mount,
   a rotor (2) connectable to the rotor mount, characterised in that the rotor (2) has one or more marking devices (6, 7), the type and/or arrangement of which serves to encode at least one characteristic of the rotor (2), and
   a safety device with at least one detection device (8, 9, 10), by means of which the at least one characteristic of the rotor (2) coded by the marking device(s) (6, 7) can be controlled, wherein the safety device is activatable according to at least one of the characteristics of the rotor (2).
2. Peristaltic pump according to claim 1, characterised in that when starting up the peristaltic pump with a rotor (2) with incorrect or unsuitable characteristics the peristaltic pump can be deactivated by the safety device and/or a warning signal can be triggered.
3. Peristaltic pump according to any of the preceding claims, characterised in that the marking device(s) (6, 7) is/are arranged relative to the rotor (2) so as to be guided past the at least one detection device (8, 9, 10) upon the rotation of the rotor (2) and in this way a signal pattern is produced by the at least one detection device (8, 9, 10), by means of which the at least one characteristic of the rotor (2) is detectable.
4. Peristaltic pump according to any of the preceding claims, characterised in that the signal pattern of the at least one detection device (8, 9, 10) is evaluable by offsetting with a speed signal of a peristaltic pump drive.
5. Peristaltic pump according to any of the preceding claims, characterised in that each of the marking devices (6, 7) detectable with each rotation by at least two detection devices (8, 9, 10).
6. Peristaltic pump according to any of the preceding claims, characterised in that from the signal pattern of the at least one detection device (8, 9, 10) also the speed and/or direction of rotation of the rotor (2) can be determined.
7. Peristaltic pump according to any of the preceding claims, characterised in that the marking device(s) (6, 7) is/are detectable without contact magnetically, electromagnetically and/or optically.
8. Peristaltic pump according to any of the preceding claims, characterised in that at least one of the detection devices (8, 9, 10) has a magnetic field sensor, preferably a Hall sensor.
9. Peristaltic pump according to any of the preceding claims, characterised in that at least one of the detection devices (8, 9, 10) has a preferably electromagnetic or inductive proximity sensor.
10. Peristaltic pump according to any of the preceding claims, characterised in that at least one marking device (8, 9, 10) has a transponder device.
11. Peristaltic pump according to any of the preceding claims, characterised in that the marking device(s) (8, 9, 10) is/are arranged at varying distances from the rotary axis of the rotor mount.
12. Peristaltic pump according to any of the preceding claims, characterised in that by means of the safety device the at least one characteristic of the rotor (2) is evaluable taking into consideration characteristics of additional components - in particular hoses, filter devices, membrane devices, dialysis machines and/or additional rotors - and/or work programmes and/or additional data - in particular treatment and/or patient data.
13. Peristaltic pump according to any of the preceding claims, characterised in that the characteristic of the rotor (2) is the type of rotor (2).
14. Dialysis machine having at least one peristaltic pump according to any of the preceding claims.

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