EP4100084A1

EP4100084A1 - Device and method for administering liquids, comprising a display unit for graphically representing the filling level

Info

Publication number: EP4100084A1
Application number: EP22708106.4A
Authority: EP
Inventors: Klaus Angersbach; Christoph Erlen
Original assignee: B Braun Melsungen AG
Current assignee: B Braun Melsungen AG
Priority date: 2021-02-24
Filing date: 2022-02-22
Publication date: 2022-12-14
Also published as: WO2022180015A1; US20240207512A1; DE102021104411A1; CN115427092A

Abstract

The invention relates to a device (2) for administering medical liquids, comprising a receiving region which is suitable for accommodating a hollow body that contains the liquid to be administered, a cover (4) which is movably connected to the receiving region between an opened position and a closed position, and a drive (8) which is suitable for acting upon the hollow body accommodated in the receiving region in such a way that the liquid contained in the hollow body is conveyed, wherein the device (2) comprises a display unit (10) for graphically representing the filling level of the hollow body, which is suitable for displaying the filling level of the hollow body on the basis of one or more operating parameters of the drive, which are in particular relevant for conveying the liquid. The invention further relates to a method for administering medical liquids.

Description

DEVICE AND METHOD FOR ADMINISTRATION OF LIQUIDS WITH DISPLAY UNIT FOR GRAPHIC REPRESENTATION OF THE FLUID LEVEL

description

technical field

The present disclosure relates to a medical fluid delivery device, particularly a syringe pump. Furthermore, the present disclosure relates to a method (for operating a device) for administering medicinal liquid.

When using devices for administering medical liquid, in particular syringe pumps, it is essential that the user always knows how much liquid is still present in the flea body, in particular the syringe. In particular, it must be possible to rule out that the filling volume of the syringe falls below a critical limit, as this could lead to incorrect drug dosing and even life-threatening situations.

With known syringe pumps, this can be ensured, for example, in that a control panel of the syringe pump and an inserted syringe are freely accessible and visible at all times, so that the fill level can be read directly on the syringe and at the same time the control panel for displaying or controlling delivery-relevant data is visible . The disadvantage of this, however, is that the syringe pump does not have a compact structure due to its design, in which the control panel and the syringe are arranged one above the other or next to each other in order to be freely accessible, and it takes up a relatively large proportion of the space that is already scarce in an intensive care unit.

There are also known syringe pumps in which the syringe can only be inserted when the front panel is opened and behind the front panel during operation lies. This does have the advantage that a compact, space-saving syringe pump can be provided as a result, with the fill level of the syringe being able to be viewed directly only when the front panel is open. This has the disadvantage that the front panel for displaying or controlling data relevant to conveyance cannot be observed or adjusted at the same time as viewing the filling level.

In addition, there are syringe pumps known, for example, from DE 20209581 U1, in which the inserted syringe can only be inserted when the operating front of the syringe pump is opened and lies behind the operating front in the closed state. The fill level of the syringe can be read through a disc on the front panel. Alternatively, an area can be cut out in the front panel so that the fill level and the front panel are visible at the same time. However, this in turn has the disadvantage that the syringe pump as such requires a larger design or that, with a compact design of the syringe pump, the syringe must be visible at the expense of the size of the control panel. However, since the front panel should be as large as possible for modern, flexible and intuitive operation, i.e. in particular with a large display, the provision of a pane or a recess in the front panel for direct viewing of the syringe fill level should be avoided.

For example, an infusion system is known from EP 3266481 A1, in which a liquid-gas boundary of a drip chamber is displayed on a display unit. The liquid fill level is determined, for example, by an optical sensor or by a mass or weight measurement together with a liquid injection rate and is shown graphically on the display unit. The disadvantage of this, however, is that the fill level cannot be read directly from the liquid container, so that the display can be unintuitive for a user who is used to the known syringe pumps. In addition, there is the problem that the determination of the fill level requires an additional sensor system and/or can be inaccurate or incorrect due to the weight measurement or the optical measurement, for example when the liquid container is tilted. In addition, a syringe pump with a receiving area, a cover, a drive and a display unit is known from WO 2014/100736 A2.

It is therefore the object of the present disclosure to provide a compact device for administering medical liquid with the greatest possible functionality, in which simple and intuitive operability and precise monitoring of the level of liquid is ensured at all times.

The object of the present disclosure is achieved by a device for administering medical liquid having the features of the independent device claim and by a method having the features of the independent method claim. Advantageous developments are the subject of the subclaims.

In particular, the device for administering medical liquid is designed as a syringe pump. A syringe pump is to be understood as a dosing pump with which the medical liquid contained in a syringe can be delivered to a patient continuously by axial movement of a plunger of the syringe. Syringe pumps are often referred to by their brand name as a perfusor.

The device has an accommodation area which is suitable for at least partially accommodating a flea body containing the liquid. This means that the medical liquid to be administered is filled in the flotation body and the flotation body for administration of the medicinal liquid is accommodated in the receiving area of the device. In the case of a syringe pump, the fluid body is designed as a cylindrical fluid body of a syringe.

The device has a cover which is movably connected to the receiving area, for example pivotally, between an open position and a closed position. In the open position of the cover, the receiving area is accessible and/or visible. This means that the floating body can be inserted into the receiving area when the cover is in the open/unfolded position and/or a fill level of the liquid contained in the hollow body can be read when the cover is in the open/unfolded position (directly on the hollow body). The cover can serve to hold the hollow body in the receiving area and/or to protect it from external influences. In the closed position of the cover, the receiving area, at least the filling level of the hollow body, is covered from the outside. This means that the filling level is hidden when the cover is in the closed/folded-in position, so that it cannot be read from the outside by a user and/or cannot be removed from the device without moving or pivoting the cover, at least not without damage can be.

The device has a drive which is suitable for acting on the hollow body received in the receiving area in such a way that the liquid contained in the hollow body is conveyed. In particular, the drive is suitable for moving a piston of the syringe axially, so that the liquid contained is pressed out of the syringe.

The device has a display unit for graphically showing the fill level of the hollow body, for example in the form of a display unit. The display unit is suitable for displaying the filling level of the hollow body on the basis of one or more operating parameter(s) of the drive that are relevant in particular for the conveying of the liquid.

Due to the fact that the one or more operating parameters of the drive, which are particularly relevant to the delivery, have a direct influence on the fill level of the hollow body, it can be used to precisely indicate the current fill level. A further advantage lies in the fact that the operating parameters of the drive for the correct dosing and delivery of the liquid to be administered must be recorded and monitored anyway, so that no additional sensors are required. By visualizing the filling level on the display unit, it is no longer necessary to read the filling level directly on the hollow body, so that the hollow body can be arranged in a space-saving manner in a non-visible/accessible area of the device without negatively affecting the functionality. According to a preferred embodiment, the display unit can be arranged on an outside of the device, in particular on the cover/integrated into the cover as an operating front. When the cover is in the closed position, the display unit can preferably extend entirely on an outside of the device, in particular on a front outside in the position of use of the device. Alternatively, the display unit can also be designed separately from the cover and, for example, on a central monitor, for example for monitoring a number of devices. In addition, it is conceivable that the display unit can be coupled to an external display device, so that the graphical representation of the fill level can also be displayed on the external display device, which is not part of the device for administering the liquid.

According to a preferred embodiment, the display unit can be used to display information for the user and to enter user commands and can be designed in particular in the form of a touch-controlled/touch-sensitive touch display/touch screen.

According to a preferred embodiment, the device can have a control unit for controlling the drive. As a result, the delivery of the liquid to be administered can be precisely adjusted and controlled.

According to a preferred embodiment, the drive can be designed as a linear drive with a drive motor and a spindle coupled to the drive motor, and a translation position of the linear drive can be the operating parameters for visualizing the fill level. According to the preferred embodiment, the translational position can preferably be coupled directly to the filling level of the hollow body. For example, the receiving area can have an insertion contour that corresponds to the shape of the hollow body to be received. In particular, a delivery plunger of the hollow body, such as the syringe plunger, can be connected to a translationally movable part of the linear drive, ie the spindle. As a result, a position of the linear drive relative to the insertion contour and thus defined relative to the hollow body. This has the advantage that the translational position is linked directly to the fill level, so that the fill level can be easily determined and displayed.

According to the preferred embodiment, the drive can have a position sensor for detecting the translational position of the drive.

According to a development of the preferred embodiment, the position sensor can be suitable for detecting the translational position of the drive directly. The position sensor can preferably be designed as a potentiometer coupled to the translation position of the drive.

According to another development of the preferred embodiment, the position sensor can be suitable for detecting a reference translation position of the drive in a predetermined reference position, and the drive can have a rotation angle sensor for detecting the rotation angle position of the drive. The translational position can thus be determined indirectly by detecting the reference translational position, which corresponds to a reference position of the spindle or the syringe plunger, and detecting the change in the rotational angle of the drive motor, which corresponds to a distance covered by the spindle or the syringe plunger. For example, the drive motor can be embodied as a stepping motor and the rotation angle sensor can be suitable for detecting the motor steps covered by the stepping motor in order to detect the rotation angle position of the drive. According to one embodiment, the drive can have a rotary encoder connected to the drive motor, in particular an encoder disk, with the rotation angle sensor being suitable for detecting the rotary encoder for detecting the rotary angle position of the drive. Preferably, the control unit can be configured to calculate the translational position of the drive based on the reference translational position and the motor steps covered.

According to a preferred embodiment, a feed or a rotational speed of the drive can be the operating parameter for visualizing the filling level. According to the preferred embodiment, the feed or the Rotational speed preferably be coupled directly to a level change or a rate of flow of Flohlkörper. According to the preferred embodiment, the display unit can be configured to display the fill level change or the delivery rate dynamically. This allows the user to easily monitor the data relevant to them.

According to a preferred embodiment, the control unit can be configured to prompt a user, preferably after closing the cover and/or in response to a predetermined user input, such as pressing a start button, to enter a flea body type of the picked up flea body, in particular a syringe size and/or or a syringe manufacturer, and/or select, i.e. choose from a predetermined selection.

The control unit can have a memory.

According to a preferred embodiment, the float body data of the drive, which are particularly relevant for conveying the liquid, can be stored in the memory as a function of the float body type, such as a length of a piston rod of the hollow body. According to the preferred embodiment, the control unit can be configured to control the drive based on the hollow body data. In particular, a correlation between a feed or a rotational speed of the drive and a delivery rate of the hollow body type can be stored in the memory. A correlation between an absolute position, i.e. between a translational position in the case of a linear drive, and a residual filling volume of the hollow body type, i.e. the filling level, can preferably be defined in the memory.

According to a preferred embodiment, image data of the hollow body types can be stored in the memory. According to the preferred embodiment, the control unit can be configured to display the image of the entered and/or selected hollow body type on the display unit, in particular in a realistic depiction of the hollow body type, with the fill level visualized. A realistic representation means that a Scaling, the visualized fill level and the type of hollow body, in particular true to scale, corresponds to the hollow body recorded and its fill level. This has the advantage that the fill level is monitored in a way that is particularly intuitive and understandable, so that potentially occurring errors can be detected at an early stage.

According to a preferred embodiment, critical fill levels of the hollow body types can be stored in the memory. Alternatively, the control unit can be configured to prompt a user, preferably in response to a predetermined user input, to enter and/or select the critical filling level of the hollow body. According to the preferred embodiment, the control unit can be configured to output a preferably optical or acoustic signal when the fill level of a picked-up hollow body falls below the critical level, with the optical signal preferably appearing on the display unit, for example in the form of a color change of the visualized fill level, in the form of a flashing representation of the visualized fill level or in the form of a warning message.

According to a preferred embodiment, the control unit can be configured to display the fill level of the hollow body on the display unit permanently or in response to a predetermined user input and/or a specific operating parameter of the drive or a specific state of the hollow body, e.g. when the fill level falls below the critical level. For example, the user can choose between different outputs on the display unit, so that the data relevant to him can always be displayed. With alternating representation of fill level on the one hand and other information, the display unit (the display) can be kept small or the information can be displayed as large as possible on the existing display area (display area).

According to a preferred embodiment, the control unit may be configured to prompt a user to enter and/or select, ie from a predetermined selection to choose which liquid is accommodated in the hollow body.

According to a preferred embodiment, which liquids are critical can be stored in the memory. According to the preferred embodiment, the control unit can be configured to emit a preferably optical or acoustic signal when the liquid contained in the hollow body is critical. The optical signal can preferably be output on the display unit, for example in the form of a color change of the visualized fill level, in the form of a flashing representation of the visualized fill level or in the form of a warning message.

According to a preferred embodiment, color codes of liquids can be stored in the memory. According to the preferred embodiment, the control unit can be configured to display on the display unit a liquid designation or a background of the liquid designation and/or the level corresponding to the color code of the liquid contained in the hollow body. In this way, an operator can easily and intuitively recognize which substance is currently being administered with the device.

The present disclosure also relates to a method of operating a medical fluid delivery device. The procedure has the following steps:

- accommodating a liquid-containing hollow body, in particular a syringe, in the device,

- Operating a drive of the device in order to convey a liquid contained in the hollow body, in particular to move a plunger of the syringe,

- Detection of an operating parameter of the drive, in particular a translational position of the drive designed as a linear drive, for example by directly detecting the translational position or by indirectly detecting a reference translational position and a relative change in position or change in the angle of rotation,

- Visualization of the filling level of the hollow body on the display unit based on the operating parameters of the drive. In other words, the present disclosure relates to a device and a method for administering medical liquid, in particular a syringe pump. The syringe is shown on the display unit (pump display) instead of being directly visible in the syringe pump. The syringe plunger is displayed dynamically according to the current level in the syringe. The fill level is determined by detecting the position of the drive (pump drive, in particular linear drive) and is linked to the syringe display. This allows the user to see the level both directly on the syringe by opening the cover (front panel) to see the syringe behind it, and (indirectly) via the visualization on the display unit (especially on the front panel).

The user can thus see the fill level of the syringe and the syringe type without opening the flap, which improves ergonomics since the operating step for opening the flap can be omitted. In addition, all funding-relevant data can be viewed at any time via the display unit. Another advantage is that the device (device design) does not require a recess for viewing the syringe, which would reduce the size of the display unit. In addition, the filling level of the syringe can also be seen on the (illuminated) display unit from a greater distance, for example from the end of a patient's bed, or in poor lighting conditions.

More specifically, loading a syringe requires a syringe selection on the display unit (which doubles as a user interface/input unit) to determine the syringe size and manufacturer of the syringe. The specific, syringe-relevant data are stored in the memory of the device and have an influence on correct liquid delivery. The liquid delivery can be realized via a linear drive acting on the syringe, so that the delivery rate results from a defined rotational frequency of the drive motor (electric motor) contained in the linear drive and a spindle converting the rotation into a translation. For example, stepping motors can be used. For the correct execution of the functions of the device, the control unit must detect both the relative change in the drive position, since this defines the delivery rate, and the absolute position, as this defines the volume of liquid remaining in the syringe. For the detection of the drive position, a detection via a position sensor is possible, the signal of which indicates the drive position directly, for example by means of a potentiometer coupled to the drive position. Alternatively, it is possible to determine the drive position via one (or more) position sensor(s) in a defined position, for example as an electromechanical switch as an end stop, in combination with the motor rotation detection. For example, the steps of the stepper motor can be counted and/or an encoder disk connected to the drive motor can be evaluated. For this purpose, the control unit determines the absolute position of the drive by moving to the position sensor in a reference run and by a counter connected to the motor rotation detection.

In addition, the syringe can be inserted with its main body into a counter-contour/insertion contour of the device and the syringe plunger can be connected to the movable part of the linear drive. In this way, the device or the control unit can determine the position of the syringe plunger in the main body of the syringe and thus the filling level of the syringe, since the position of the linear drive is defined relative to the insertion contour, the absolute position of the drive is known and geometric data of the selected syringe is stored in the memory of the control unit are deposited. The device can use the available data to visualize the fill level of the syringe on the display unit, with the visualized fill level preferably being adapted according to the dynamically conveyed quantity of liquid or the change in the drive position. The representation of the syringes adapts according to the selected syringe type, so that the user can recognize the necessary syringe type-specific features, such as the type designation and scaling. By selecting a control element on the user interface, the syringe visualization can be displayed permanently or at the user's request. The liquid color displayed in the syringe display can be used as a signal for the user to increase safety and/or ergonomics, for example by highlighting a critical drug or by changing the color depending on the fill level. Brief description of the characters

1 shows an illustration of a device for administering medical liquid with a visualized fill level at a first point in time;

2 shows an illustration of the device for administering medical liquid with the visualized fill level at a second point in time;

3 shows an illustration of the device for administering medical liquid with the visualized fill level at a third point in time; and

4 shows a schematic representation of a method for operating the device.

Description of the preferred embodiment

Hereinafter, a preferred embodiment of the present disclosure will be described based on the accompanying figures.

Figs. 1 to 3 show a medical liquid administration device 2 according to the present disclosure. The device 2 is designed in particular as a syringe pump. The device 2 has a receiving area which is suitable for receiving a fluid body (not shown) containing the liquid to be administered. The device 2 has a cover 4 connected to the receiving area movably between an open position and a closed position. In the open position of the cover 4, the receiving area is accessible, for example, for inserting the flea body and/or can be seen, for example, for reading off the fill level of the liquid contained in the flea body. In the closed position of the cover 4, the receiving area, at least the fill level of the flea body, is covered from the outside. In Fig. 1 to 3, the device 2 is shown in the closed position of the cover 4, so that the receiving area and the recordable or Recorded hollow body are not shown because they are hidden behind the cover 4. For opening and closing, the device 2 has a lever 6 which, when actuated, in particular by pulling it, moves the cover 4 into the open position and the hollow body can be inserted into the receiving area or removed from the receiving area. The filling level of the hollow body can also be read directly on the hollow body when the cover 4 is in the open position.

The device 2 has a drive 8 . The drive 8 is suitable for acting on the hollow body received in the receiving area in such a way that the liquid contained in the hollow body is conveyed. The drive 8 can preferably be designed as a linear drive. For example, the linear drive can have a drive motor designed as an electric motor and a spindle, the spindle converting the rotational movement of the drive motor into a translational movement. The translational movement is preferably coupled directly to the conveyance of the liquid contained in the hollow body.

The device 2 has a display unit 10 for graphically displaying the filling level of the hollow body. In particular, the display unit 10 is designed as a display. Preferably, the display unit 10 can also serve as an input unit and can be embodied as a touch display, for example. In the embodiment shown, the display unit 10 is integrated in the cover 4 on an outside of the device 2 . As a result, when the device 2 is in the position of use, the display unit 10 is oriented forwards towards the user and is easily visible. Alternatively, it is also possible to arrange the display unit 10 in an external display device.

The display unit 10 is suitable for displaying the filling level of the hollow body on the basis of one or more operating parameter(s) of the drive 8 that are relevant in particular for the conveying of the liquid. In particular, a translational position of the drive 8 designed as a linear drive can be an operating parameter for visualizing the filling level. The translational position of the linear drive is preferably directly related to the filling level of the Coupled to the hollow body, for example by connecting a piston arranged axially displaceably within the hollow body to convey the liquid to the spindle of the drive 8 .

The drive 8 can have a position sensor for detecting the translational position of the drive. The position sensor can be suitable for directly detecting the translational position of the drive. Alternatively, the position sensor can be suitable for indirectly detecting the translational position of the drive by detecting a reference translational position of the drive in a predetermined reference position, and the drive has a rotation angle sensor for detecting the rotation angle position of the drive, on the basis of which the (absolute )Translation position of the drive and thus the fill level can be determined.

In particular, a feed and/or a rotational speed of the drive 8 can be an operating parameter for visualizing the filling level. In this case, the advance and/or the rotational speed is preferably coupled directly to a change in fill level or a (liquid) delivery rate of the hollow body. For example, the display unit can be configured to display the fill level change or the delivery rate dynamically.

According to a preferred embodiment, the device 2 can have a control unit for controlling the drive. The control unit can preferably be configured to prompt a user to enter and/or select a hollow body type of the hollow body received, in particular a size, a volume and/or a manufacturer. For example, the controller may prompt the user after closing the cover and/or in response to a predetermined user input, such as pressing a start button/pad/button 12 or a power button/pad/button 14, prompt for input.

According to a preferred embodiment, the control unit can have a memory. Hollow body data depending on the hollow body type can be stored in the memory. For example, for pumping the liquid relevant hollow body data can be stored, such as a length of a hollow body piston rod. The control unit can preferably be configured to control the drive on the basis of the hollow body data. In particular, a correlation between a feed or a rotational speed of the drive and a fill level change/conveyance rate of the hollow body type can be stored in the memory. A correlation between an absolute position, ie between a translation position in the case of a linear drive, and a residual filling volume of the hollow body type, ie the fill level, can preferably be defined in the memory.

According to a preferred embodiment, image data of the hollow body types can be stored in the memory. Preferably, the control unit can be configured to display the image of the type of hollow body entered and/or selected on the display unit 10, in particular in a realistic representation of the type of hollow body, with the fill level visualized and with the same orientation/alignment as the hollow body/syringe located behind the cover 4 to display.

In the in Figs. This can be seen in the embodiment illustrated in FIGS. A visualized syringe 16 is shown on the display unit 10, which realistically corresponds to the selected type of hollow body. A visualized fill level 18 is shown inside the syringe 16 . For this purpose, a scale 20 of the filling volume and a visualized syringe plunger position 22 are indicated on the syringe 16 . The syringe 16 is indicated on the display unit 10 with its type designation 24 and its maximum volume 26, which correspond to the entered hollow body type or the hollow body data stored in the memory.

Depending on the operating parameters of the drive 8, the fill level 18 is visualized dynamically. In Figs. 1 to 3 the fill level 18 is shown at different points in time, with the fill level 18 decreasing between the representation in FIG. 1 and FIG. 3 . In addition, a visualized delivery rate 28 , for example in ml/h, is shown on the display unit 10 .

According to a preferred embodiment, critical filling levels of the hollow body types can be stored in the memory. Preferably, the control unit can be configured to fall below the critical level, eg 5ml, the hollow body to output a preferably optical or acoustic signal. For example, the optical signal can be output on the display unit 10, for example in the form of a color change of the visualized filling level 18, in the form of a flashing representation of the visualized filling level 18 or in the form of a warning message.

According to a preferred embodiment, the control unit can be configured to permanently display the visualized fill level 18 of the hollow body on the display unit 10 . Alternatively, the control unit can be configured to display the visualized filling level 18 of the hollow body on the display unit 10 in response to a predetermined user input, for example when a display change button 30 is pressed, and/or when the filling level falls below the critical level. For example, the user can choose between different outputs on the display unit 10 using the display change button 30 .

According to a preferred embodiment, the control unit can be configured to prompt the user to input and/or select, i.e. choose from a predetermined selection, which liquid is contained in the hollow body. Preferably, the control unit is configured to visualize the selected liquid on the display unit 10 by displaying a liquid designation 32 . For example, the controller may be configured to prompt the user for input of the liquid in response to a predetermined user input, such as actuating a liquid selector button/pad 34 to select the appropriate liquid.

In particular, color codes of liquids can be stored in the memory. According to a preferred embodiment, the control unit can be configured to display on the display unit 10 the liquid designation 32 or a background of the liquid designation 32 and/or the filling level 18 according to the color code of the liquid contained in the hollow body.

Properties of the liquids can preferably be stored in the memory, for example which liquids are critical. The control unit can preferably be configured to generate a preferably optical or acoustic signal output when the liquid contained in the hollow body is critical. The optical signal can preferably be output on the display unit, for example in the form of a color change of the visualized fill level 18, in the form of a flashing representation of the visualized fill level 18 or in the form of a warning message.

The present disclosure also relates to a method of operating the device 2 illustrated in FIG. 4 . In a first step S1 of the method, a liquid-containing hollow body is accommodated in the device. In a second step S2, the drive 8 of the device 10 is operated in order to convey a liquid contained in the hollow body. In a third step S3, one or more operating parameters of the drive 8 is/are recorded. In particular, a translational position of the drive 8 designed as a linear drive and/or a feed or rotational speed of the drive 8 is detected. In a fourth step S4, the fill level of the hollow body is displayed on the display unit 10 as the visualized fill level 18 based on the one or more operating parameters.

Claims

Expectations

1. Device (2) for administering medical fluid, in particular a syringe pump, with a receiving area which is suitable for receiving a fluid containing the fluid to be administered, a cover (4) which can be moved with the receiving area between an open position and a closed position, the receiving area being accessible in the open position of the cover (4), for example for inserting the float body and/or being visible, for example for reading the fill level of the liquid contained in the float body, and with the receiving area being at least the fill level of the float body , is covered from the outside when the cover (4) is in the closed position, and a drive (8) which is suitable for acting on the float body received in the receiving area in such a way that the liquid contained in the float body is conveyed, characterized by a Display unit (10) for graphic n Representation of the fill level of the float body, which is suitable for displaying the fill level of the float body on the basis of one or more operating parameters of the drive (8) that are particularly relevant for the conveyance of the liquid.

2. Device (2) according to claim 1, characterized in that the drive (8) is designed as a linear drive and a translational position of the linear drive is an operating parameter for visualizing the fill level, the translational position of the linear drive preferably being coupled directly to the fill level of the floating body is.

3. Device (2) according to claim 2, characterized in that the drive has a position sensor for detecting the translational position of the drive (8), the position sensor being suitable for detecting the translational position of the drive (8) directly, or the position sensor is suitable for detecting a reference translational position of the drive (8) in a predetermined reference position, and the drive (8) has a rotational angle sensor for detecting the rotational angle position of the drive (8).

4. Device (2) according to one of claims 1 to 3, characterized in that a feed and / or a rotational speed of the drive (8) is an operating parameter for visualizing the level, the feed and / or the rotational speed preferably directly with a Level change of Flohlkörper is coupled.

5. Device (2) according to any one of claims 1 to 4, characterized in that the device (2) comprises a control unit which is configured to a user, preferably after closing the cover (4) and / or in response to prompting a predetermined user input to enter and/or select a type of flea body of the picked-up flea body, in particular a size, a volume and/or a size.

6. The device (2) according to claim 5, characterized in that the control unit has a memory in which the float body data relevant in particular for conveying the liquid are stored as a function of the float body type, and the control unit is configured to drive the drive (8) based on the flea body data.

7. The device (2) according to claim 6, characterized in that image data of the types of fleas are stored in the memory and the control unit is configured to display on the display unit (10) the image of the entered and/or selected type of fleas, in particular in a realistic representation of the flea body type, with visualized filling level.

8. The device (2) according to claim 6 or 7, characterized in that critical fill levels of the flea body types are stored in the memory and the control unit is configured to output a preferably optical or acoustic signal when the fill level of a picked-up flea body falls below the critical level.

9. Device (2) according to claim 8, characterized in that the control unit is configured to display the level on the display unit (10) permanently or in response to a predetermined user input and/or when the level falls below the critical level.

10. The device (2) according to any one of claims 6 to 9, characterized in that color codes of liquids are stored in the memory and the control unit is configured to show on the display unit (10) a liquid designation or a flickering background of the liquid designation and/or the Display level according to the color code of the liquid contained in the hollow body.

11. A method for operating a device (2) for administering medical liquid, characterized by the steps:

- receiving a liquid-containing hollow body in the device (2)

(S1 ),

- Operating a drive (8) of the device (2) in order to convey a liquid contained in the hollow body (S2),

- Detection of one or more operating parameters of the drive (8) (S3), in particular a translational position of the drive (8) designed as a linear drive and/or a feed and/or a rotational speed of the drive (8),

- Visualization of the fill level of the hollow body on a display unit (10) based on the one or more operating parameters of the drive (8) (S4).