Sensor-monitored pump

Abstract

This document discloses a medical pump system (20) for moving fluid through tubing, which may include a machine having a motor (24) and a drive mechanism (25), and a pump head configured to be removably coupled to the drive mechanism of the machine. The machine may include an inductive sensor (26) and at least one processor (28) connected to the motor and the inductive sensor. The pump head may include a metal element (32) intended to cooperate with the inductive sensor of the machine.

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE

[0001] The present disclosure relates to medical systems comprising pumping devices intended to move fluids in a controlled manner, for example in the field of dialysis therapy. [Background technology]

[0002]

[0002] In many medical treatments, pump flow rate is a critical parameter and uncontrolled variations in this parameter can pose significant risks to the patient.

[0003]

[0003] Accurate measurement of the rotational speed of a medical pump can be essential for certain types of treatment, not only to ensure medical effectiveness but also for patient safety. For example, in hemodialysis treatment, the pump flow rate is very important because it can induce more or less ultrafiltration (UF) during treatment and also affect the removal of toxins. Therefore, the speed of the pump head is a very important data that must be accurately controlled. If the pump is a peristaltic pump, the rotation of the roller support should be controlled.

[0004]

[0004] Furthermore, when peristaltic pumps are used with a drive mechanism that drives the pump head by friction, slippage can occur, and therefore the drive needs to be monitored.

[0005]

[0005] However, the accuracy of this monitoring may depend on the sensors used. Various solutions have been tested, the main drawbacks of which are (for example): An optical sensor and a white label printed on the roller support. This solution had several drawbacks, notably the optical sensor becoming dirty over time and being sensitive to possible reflections and other light emitters (e.g., ambient light, other sensors, etc.). The optical sensor could only detect one revolution (low resolution), did not provide rotation direction information, and ultimately required factory calibration. Galvanic sensors: Risk of oxidation of contacts over time due to dialysate and mechanical wear. Magnetic sensors: Magnets in disposable cartridges are too expensive. Capacitive sensors: Too sensitive to the relative position of the cartridge and to EMI. Summary of the Invention

[0006]

[0006] This general description is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This general description is not necessarily intended to identify key features or essential features of the claimed subject matter, nor is it intended to aid in determining the scope of the claimed subject matter.

[0007]

[0007] A first aspect of the present disclosure is a machine which may include at least one of a motor and a drive mechanism; a pump head that may be configured to be removably coupled to a drive mechanism of the machine; The present invention provides a medical pump system for moving fluid through a tube, which may include or comprise:

[0008] The machine may include an inductive sensor and at least one processor (or processing device) connected to the motor and the inductive sensor. The pump head may include a metal element (e.g., the only element containing metal) intended to cooperate with the inductive sensor of the machine. The at least one processor may be configured to determine (or process or monitor or detect) a faulty drive or speed of the pump head based on data received from the inductive sensor.

[0009]

[0009] When the drive mechanism and the pump head are operably coupled, the motor may be configured or adapted to drive rotational movement of the pump head via the drive mechanism.

[0010]

[0010] The at least one processor may be configured to monitor data regarding the speed of movement of the pump head by using the inductive sensor and the metallic element. The at least one processor may be configured to monitor that the pump head is being driven at a required speed by using the inductive sensor and the metallic element. The at least one processor may be configured to control the motor in response to the data regarding the speed of the pump head.

[0011] At least one processor is in the following state: the angular position of the pump head relative to the flexible tubing (e.g., the roller position relative to the flexible tubing in a peristaltic pump); Defective drive of the pump head, Angular velocity of the pump head, Slippage of the pump head relative to the drive mechanism, or Position of metal elements relative to the pump head may be configured to detect at least one of:

[0012] The at least one processor can be configured to control the position of the pump head (e.g., the angular position of the pump head relative to the flexible tubing). The at least one processor can be configured to monitor the position of the pump head (e.g., the angular position of the pump head relative to the flexible tubing) to move the pump head to a predetermined position (e.g., the angular position of the pump head relative to the flexible tubing). These features can be useful for improving pumping accuracy.

[0013] The pump head may be driven by friction with the drive mechanism. The at least one processor may be configured to determine slippage of the pump head relative to the drive mechanism. The at least one processor may be configured to control the motor in response to the slippage. The at least one processor may be configured to control the motor to avoid any slippage of the pump head relative to the drive mechanism.

[0014]

[0014] The pump head may include at least one roller configured to compress the tube.

[0015] The metal element may include at least one of metallic paint (conductive), a label, a sticker, a PCB (printed circuit board), any metallic highly conductive element, aluminum, and copper. The metal element may have a strip shape, a square shape, a portion of an angle, or some other curved shape. The inductive sensor may include an absolute encoder or an incremental encoder.

[0016]

[0016] A second aspect of the present disclosure provides a dialysis system including the medical pump system disclosed above.

[0017] A third aspect of the present disclosure is a reusable machine having a motor with a drive mechanism and controlled by a processor; a disposable cartridge having a pump head configured to be removably coupled to a drive mechanism of the machine and operably coupled to the fluid pathway to move fluid therethrough; The present invention provides a medical system that may include or comprise:

[0018]

[0018] The reusable machine may comprise an inductive sensor connected to a processing device, and the pump head may comprise a metallic element intended to cooperate with the inductive sensor of the machine. The processing device may be configured to detect a faulty actuation of the pump head based on data received from the inductive sensor.

[0019] A fourth aspect of the present disclosure is a machine that may include a motor and a drive mechanism operably coupled to the motor; a pump unit that may include at least one of a frame, a tube, and a pump head; A medical pump system is provided that may include:

[0020]

[0020] The pump head may be configured to be rotatably driven by a drive mechanism, while the frame may remain stationary relative to the machine in use. The pump unit may further be configured to be removably coupled to the machine.

[0021]

[0021] The machine may further comprise an inductive sensor and at least one processor connected to the motor and the inductive sensor 5. The pump head may further comprise a metal element (e.g. the only element comprising metal) intended to cooperate with the inductive sensor of the machine.

[0022] A fifth aspect of the present disclosure is a machine having a motor and a drive mechanism; a pump head configured to be removably coupled to a drive mechanism of the machine and configured to be operably coupled to the tubing; The present invention provides a medical pump system for moving fluid through a tube, which may include or comprise:

[0023]

[0023] The machine may include an inductive sensor and at least one processor (or processing device) connected to the motor and the inductive sensor. The pump head may include a metal element (e.g., the only element containing metal) intended to cooperate with the inductive sensor of the machine.

[0024]

[0024] The pump head may be configured to rotate relative to the tubing, and the at least one processor may be configured to detect the angular position of the pump head relative to the tubing.

[0025] A sixth aspect of the present disclosure is a reusable part, which may include a drive mechanism; and A disposable part that may include tubing and a pump head The present invention provides a medical pump that may include at least one of the following:

[0026] The pump head may be arranged to be operatively coupled to the tubing and may be configured to rotate relative to the tubing during use. The disposable portion may be configured to be removably coupled to the reusable portion. The reusable portion may be configured to be used sequentially with several disposable portions.

[0027] The reusable part may include an inductive sensor and a processor (or processing unit) operably coupled to at least one of the drive mechanism and the inductive sensor. The pump head may include a metal element (e.g., the only element including metal) intended to cooperate with the inductive sensor of the reusable part.

[0028] The reusable portion may further include a pressure sensor configured to measure the pressure of the fluid downstream or upstream of the pump head. The pressure sensor may be operably coupled to the processor to detect at least one of the aforementioned conditions using the pressure data in addition to the inductive sensor data.

[0029] The main advantages of this solution are: No problems with clogging or deterioration over time Low sensitivity to EMI (electromagnetic interference), Fewer mechanical constraints (distance between the inductive sensor and the metal element or their position) is. [Brief explanation of the drawings]

[0030]

[0030] The present invention will be better understood in light of the following detailed description, including non-limiting examples illustrated by the following figures. [Figure 1] FIG. 1 illustrates an embodiment of the present disclosure. [Figure 2] FIG. 1 is a diagram showing a first flowchart. [Figure 3] FIG. 10 is a diagram showing a second flowchart. [Figure 4] FIG. 1 illustrates an embodiment of the present disclosure. [Figure 5] FIG. 1 illustrates an embodiment of the present disclosure. [Figure 6] FIG. 1 illustrates an embodiment of the present disclosure.

[0031] a list of elements 1 System 2 processors 3 motors 4 Drive mechanism 5 Inductive Sensors 6 pump head 7 Fluid Path 10 Dialysis Systems 11 Reusable devices 12 Disposable Cartridges 13 Rotating part 14 Motor 15 shaft 16 Inductive Sensor 17 Metal Element 18 Processing equipment 20 Medical Systems 21 Reusable parts 22 Disposable Part 24 Electric Motor 25 Drive mechanism 26 Inductive Sensor 28 Processing equipment 29 Support 30 Laura 31 Holder 32 Target / Metal Element 33 Holder 100 Run the motor 101 Pump Head Data 102 Data Processing 103 OK 104 Not OK -1 105 Adapting the operation of the motor 106 Not OK-2 107 Stop the motor 110 Start the motor 111 Motor Data 112 Pump Head Data 113 Data Processing 114 within range 115 Adapting the operation of motors 116 Out of Range 117 Stop the motor DETAILED DESCRIPTION OF THE INVENTION

[0032]

[0031] In the following detailed description, reference is made to the accompanying drawings which form a part hereof, and which show, by way of illustration, several embodiments of devices, systems, and methods. It is to be understood that other embodiments are contemplated and may be made without departing from the scope or spirit of the present disclosure. Therefore, the following detailed description is not to be taken in a limiting sense.

[0033]

[0032] All scientific and technical terms used herein have the meanings commonly used in the art unless otherwise specified. The definitions provided herein are intended to facilitate understanding of certain terms used frequently herein and are not intended to limit the scope of the present disclosure.

[0034]

[0033] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include embodiments having plural referents unless the content clearly dictates otherwise.

[0035] As used in this specification and the appended claims, any directions referred to herein, such as "top," "bottom," "left," "right," "upper," "lower," and other directions or orientations, are provided herein for clarity with respect to the figures and are not intended to limit the actual device or system. The devices and systems described herein can be used in several directions and orientations.

[0036]

[0035] As used in this specification, the words "have," "having," "include," "including," "comprise," "comprising," and the like are used in their open-ended sense and generally mean "including but not limited to."

[0037]

[0036] As used herein, "at least one of A, B, and C," "at least one of A, B, or C," "selected from the group consisting of A, B, C, and combinations thereof," etc., are used in their open-ended sense, including or comprising "A only, or B only, or C only, or any combination of A, B, and C," unless the context clearly dictates otherwise.

[0038]

[0037] As used in this specification and the appended claims, the term "or" is generally used in its sense including or comprising "and / or" unless the content clearly dictates otherwise.

[0039]

[0038] This application claims the benefit of priority from European Patent Specification No. 22198816.5, filed on September 29, 2022 in the name of Nextkidney SA, the entire disclosure of which is incorporated herein by reference.

[0040] According to one embodiment (as illustrated by FIG. 1), the system (1) disclosed in this document comprises: machine, a processor or processing unit (2); Motor (3), Drive mechanism (4), Inductive sensor (5), Pump head (6), and Fluid path (7) The present invention includes or comprises at least one of the following:

[0041]

[0040] The motor is coupled (e.g., mechanically) to a drive mechanism (4). At least one of the motor and the drive mechanism may be disposed within a machine (e.g., a reusable machine). The pump head (6) is configured to be removably coupled to the drive mechanism (4). When the pump head and the drive mechanism are operably coupled, the drive mechanism may be configured to drive the pump head according to parameters (which may be therapy-defined or predetermined). In a possible embodiment, the pump head is frictionally driven by the drive mechanism.

[0042]

[0041] Where the motor is a rotary motor, a drive mechanism may be fixedly or operably coupled to the shaft (rotor) of the rotary motor, and the drive mechanism may drive the rotational movement of the pump head.

[0043] The pump head may comprise at least one roller (e.g., two, three, or more) configured to compress a (flexible) tube (which may comprise a tube) to move fluid through the fluid path (7), as a peristaltic pump does. The rollers may contact a drive mechanism to drive the pump head by friction.

[0044]

[0043] The motor may comprise an electric motor (eg, a brushless motor). The motor may be controlled by a processor to control the operation of the motor (eg, the rotational speed of the motor).

[0045]

[0044] The pump head (6) may comprise a metallic element intended to cooperate with the inductive sensor (5). To monitor the pump head, the inductive sensor may be connected to a processor (and / or to another processor, but for simplicity of explanation, only one processor will be described herein unless the context clearly indicates otherwise). For example, the processor may monitor the state of the pump head, such as the presence of the pump head, the position of the pump head, the angular position of the pump head relative to the tubing or frame, the position relative to the inductive sensor, rotational movement, speed of movement, acceleration, slippage (e.g., relative to the drive mechanism), etc.

[0046]

[0045] For ease of explanation, this document may also use the terms "processing device" or "control module," which may be located within the system and may include one or more processors.

[0047] In one embodiment, the processing unit may control the motor speed and / or monitor data related to the pump head speed. The processing unit may also monitor the motor speed. The processing unit may be configured to process (e.g., calculate, compare) data related to the speed motor and data related to the pump head speed and to determine an action based on this data processing.

[0048]

[0047] In one embodiment, to monitor pump head speed, the processing device may be configured to receive two angle measurements (e.g., angular positions) separated by a predetermined time, in which case the pump head speed can be calculated by the processing device based on these angle measurements.

[0049] In one embodiment, to monitor pump head speed, the processor may be configured to monitor the motor RPM and pump head RPM (either over a defined period of time or during one pump head revolution), where the processor may compare the data. The processor may also take into account the motor reduction ratio.

[0050] In one embodiment, the system may include two separate processors: a first processor configured to control the motor and a second processor configured to receive inductive sensor measurements (pump head speed). The first processor may also receive inductive sensor measurements. In one embodiment, both processors receive the same data, and each processor (first and second) processes the data itself, each capable of alerting the patient or triggering an action (alarm, correction, etc.).

[0051]

[0050] The motor may further include its own sensor configured to monitor the operation of the motor. This sensor may transmit data to a processing unit to monitor the proper operation of the motor itself. The processing unit may also be configured to compare the motor sensor data with the inductive sensor (5) data. The motor sensor may be located with or within the motor and may be connected to the processing unit.

[0052] The processor may be configured to initiate or execute an action in response to one or more conditions (e.g., thresholds, operating ranges, etc.). For example, if pump head slippage (e.g., a difference between pump head speed and motor speed, or a difference between expected / required pump head speed and measured pump head speed) occurs within a first operating range (due to a slight change in roller geometry or roller surface condition), the motor speed may be adapted to maintain the required pump head speed (e.g., without notifying the patient). For example, if slippage reaches a first threshold, the processor may adapt the motor speed to allow the pump head speed to reach the required speed. Also, if pump head slippage occurs within a second operating range, the processor may generate an alert (via a GUI or alarm), send a notification to the patient, and / or stop therapy. For example, if slippage reaches a second threshold (different from the first threshold), the processor may stop the motor.

[0053]

[0052] If the motor speed differs from the pump head speed and / or if the pump head speed differs from the required or expected speed, the processor may act on the system. For example, the processor may stop the motor, increase or decrease the operation of the motor (e.g., speed of rotation), adapt the motor speed (e.g., to reach the required pump head speed), or act on other elements of the system (other motors, pumps, valves, etc.). If the system is a hemodialysis treatment system including a blood pump, one or more dialysate pumps, and one or more valves, a failure of the pump head of a blood pump may stop all pumps and close the valves, and a failure of one dialysate pump may stop only the dialysate pump.

[0054] For example, as shown in Figure 2, a processing device may operate a motor (100) and receive data regarding pump head speed (101). The processing device may process the data (102) and determine whether no problem is detected (103), whether a first fault (104) is detected, or whether a second fault (106) is detected. In the case of a first fault (104), the processing device may adapt the operation of the motor (105), and in the case of a second fault (106), the processing device may stop the motor (107).

[0055] For example, as shown in Figure 3, a processor may operate the motor (110) and receive or acquire data regarding the motor (111) (Sm) and pump head speed (112) (Sph). The processor may process the data (113) and determine whether the data is within range (114) or out of range (116). If the data is within range (114), the processor may adapt the motor speed (115) (if necessary), but if the data is out of range (116), the processor may stop the motor (117).

[0056] In one embodiment, the system may have a reusable machine (or reusable part) and a disposable device (e.g., cartridge) (or disposable part). The disposable device comprises elements that must be discarded after a predetermined number of uses, e.g., after one treatment. The operational life of the disposable device may directly depend on the number of treatments. These elements may be elements wetted by medical fluids (e.g., dialysis fluid) or by the patient's body fluids (e.g., blood).

[0057]

[0056] The disposable device may include at least one of a tube, a connector, a port, a shell, a frame, or a valve.

[0058]

[0057] Preferably, the reusable machine comprises expensive elements, such as sensors, electronic components, screens, valve or pump actuators, processors, or memories. The reusable machine is used continuously with several disposable devices. The reusable machine may comprise parts that can be replaced when they become too worn, when they break, or after a predetermined period of time that is much longer than one treatment. Replacement of the reusable machine may depend on the wear of the parts.

[0059]

[0058] Example of application to a dialysis system According to the embodiment shown in Figure 4, the dialysis system (10) comprises a reusable device or machine (11) and at least one disposable cartridge (12). Preferably, the reusable device (11) comprises the expensive elements (such as actuators, motors, sensors, etc.), and the disposable cartridge (12) includes or comprises the fluid pathways, such as tubing and / or connectors. The dialysis system may be configured to removably receive the disposable cartridge (12).

[0060] The pump device of the system may be a peristaltic pump comprising a stationary part disposed within the reusable device (11) and a rotating part (13) disposed within the disposable cartridge (12). The stationary part may include or comprise a motor (14) (e.g., an electric brushless motor) having a shaft (15) configured to drive the rotating part (13), which includes or comprises at least one (e.g., three) rollers held by a support having a hole configured to allow passage of the shaft (15) (e.g., a floating shaft).

[0061]

[0060] For further details regarding floating shafts, reference may be made to US Pat. No. 11,092,148 or European Patent Application No. 22186084.4, the contents of which are incorporated herein by reference.

[0062]

[0061] As the aim of the system is to be as quiet as possible, a direct mechanical linkage between the shaft and the rollers (e.g. gears) may not be as advantageous as a friction drive. Therefore, the rollers may be friction driven with the shaft (15) and the system may monitor that the pump head is being driven at the required speed and avoid any potential slippage.

[0063]

[0062] As explained above, several types of sensors are being investigated. The use of inductive sensors is particularly advantageous.

[0064]

[0063] In a preferred embodiment, the reusable device further includes or comprises an inductive sensor (16), and the cartridge (12) includes or comprises a metal element (17) fixed to the rotating pump head (13) and configured to cooperate with the inductive sensor (16).

[0065]

[0064] The metal element (17) may be a metallic paint (conductive), a label / sticker, or a PCB (printed circuit board), and may comprise any metallic highly conductive element, such as aluminum or copper, with a thickness comprised between 1 and 100 μm, or between 15 and 50 μm (e.g., 35 μm). In one embodiment, the shape of the metal element is a copper semicircle / ring on a PCB. However, depending on the type of encoding (absolute vs. incremental), the metal element may have various shapes, such as a stripe, a square, a part of an angle, or some other curve.

[0066]

[0065] The metal element must or can be rigidly fixed on the rotating piece of the rotating part, for example on the pump head (roller support) (13).

[0067] In one embodiment, due to the small dimensions of the pump head, the inductive sensor and metal element can form an absolute encoder. For example, a first PCB with a copper semicircle / ring (used as the metal element) is glued to the pump head. The absolute encoder can be implemented by using a second PCB on the fixed part, on which an integrated circuit is mounted and connected to three coils. These coils may consist of a transmit coil, and the other two are a sine and cosine receive coil. Since the metal semicircle on the second part (first PCB) faces the second PCB, the absolute angular position is obtained by calculating the arctangent of the sine / cosine signals. Separating the two sine and cosine signals has the advantage that it cancels out most of the signal noise and gain, thereby eliminating the need for calibration and reducing sensitivity to distance and relative position with respect to the pump head.

[0068] In another embodiment, an incremental inductive encoder may use two striped areas on the rotating part and two coils or a pair of coils (depending on the sensor used) on the stationary part, each of which may have generated an A signal and a B signal, respectively, as an incremental encoder would.

[0069]

[0068] The inductive sensor may be positioned so that it faces the metal element when the disposable cartridge is fully inserted into the reusable device.

[0070] The absolute inductive encoder may be connected to a processing unit (18). The processing unit may include a first processor (called a main or control processor) configured to control the pump and a second processor (called a protection processor) configured to monitor the rotation of the pump head. The absolute angular position may be periodically obtained by the processing unit (18) and used in combination with a fixed pump motor encoder to control the pump and monitor possible slippage between the pump motor shaft and the roller (pump head).

[0071] Another example 5 and 6, the medical system (20) may include a reusable portion (21) and a disposable portion (22). The reusable portion (21) may include an electric motor (24) having a drive mechanism (25), and an inductive sensor (26) that may be fixed to a support (29) of the reusable portion (21). The motor (24) and the inductive sensor may be electronically coupled to a processing unit (28) that may include at least one processor.

[0072] The disposable part (22) may be configured to be removably inserted into the reusable part (21). The disposable part (22) may comprise a rotatable part having a roller assembly with one or more rollers (30) and a holder (31). The disposable part may further comprise a target (32) having a metallic element intended to cooperate with an inductive sensor (26) to provide information from the rotatable part to a processing device (28). The disposable part (22) may further comprise a rotatable part holder (33) (e.g., the rotatable part may have rotational motion relative to the holder (33) or the reusable part), which may comprise a flexible tube for compression by at least one roller (30). The drive mechanism (25) may be configured to drive the rollers by friction (due to contact between the rollers and the drive mechanism (e.g., the shaft and / or rotor of a motor)).

Claims

1. a. A machine comprising a motor (3) and a drive mechanism (4); b. a pump head (6) configured to be removably coupled to the drive mechanism of the machine; A medical pump system (1) for moving fluids through flexible tubing, comprising: the machine further comprises an inductive sensor (5) and at least one processor (2) connected to the motor (3) and the inductive sensor (5); A medical pump system (1), wherein the pump head (6) further comprises a metal element intended to cooperate with the inductive sensor (5) of the machine, and wherein the at least one processor is configured to determine a faulty drive or speed or position of the pump head based on data received from the inductive sensor (5).

2. 2. The medical pump system of claim 1, wherein the motor (3) is configured to drive rotational movement of the pump head (6) via the drive mechanism (4) when the drive mechanism and the pump head are operatively coupled.

3. 3. The medical pump system of claim 1, wherein the at least one processor is configured to monitor data relating to the speed of movement of the pump head by using the inductive sensor and the metallic element.

4. 4. The medical pump system of claim 1, wherein the at least one processor is configured to monitor that the pump head is driven at a required speed by using the inductive sensor and the metallic element.

5. The medical pump system of any one of claims 1 to 4, wherein the at least one processor (2) is configured to control the motor in response to data relating to the pump head speed.

6. The medical pump system according to any one of claims 1 to 5, wherein the pump head (6) is driven by friction with the drive mechanism (4).

7. The medical pump system of claim 6, wherein the at least one processor (2) is configured to determine slippage of the pump head (6) relative to the drive mechanism (4).

8. 8. The medical pump system of claim 7, wherein the at least one processor (2) is configured to control the motor (3) in response to the slippage.

9. 9. The medical pump system of claim 6, 7, or 8, wherein the at least one processor (2) is configured to control the motor to avoid any slippage of the pump head relative to the drive mechanism.

10. The medical pump system according to any one of the preceding claims, wherein the pump head (6) comprises at least one roller configured to compress the flexible tubing.

11. The medical pump system of any one of claims 1 to 10, wherein the metal element comprises at least one of metallic paint (conductive), a label, a sticker, a PCB (printed circuit board), any metallic highly conductive element, aluminum, and copper.

12. The medical pump system according to any one of claims 1 to 11, wherein the metal element has a strip shape, a square shape, a part of an angle, or any other curved shape.

13. The medical pump system of any one of claims 1 to 12, wherein the inductive sensor comprises an absolute encoder or an incremental encoder.

14. 14. The medical pump system of claim 1, wherein the at least one processor is configured to determine an angular position of the pump head relative to the flexible tubing and to control the motor to move the pump head to a particular angular position relative to the flexible tubing.

15. A dialysis system (10) comprising a medical pump system (1) according to any one of claims 1 to 14.

16. a. a reusable machine (11) having a motor (14) with a drive mechanism and controlled by a processor (18); b. a disposable cartridge (12) having a pump head configured to be removably coupled to the drive mechanism of the machine and operably coupled to a fluid pathway to move fluid therethrough; A medical system (10) comprising: the reusable machine (11) further comprises an inductive sensor (16) connected to the processing device (18); A medical system (10) in which the pump head further comprises a metal element intended to cooperate with the inductive sensor of the machine, and the processing device (18) is configured to determine a faulty drive or speed or position of the pump head based on the data received from the inductive sensor (5).

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