System and method for determining an updated drug dosage

Abstract

A control system (1) for an infusion pump (2) comprises: a processor assembly (10); and memory (11), the memory (11) storing instructions (12) that, when executed by the processor assembly (10), cause the processor assembly (10) to perform the following steps: receive a drug dosage and a drug type; read a drug data structure (130) corresponding to the received drug type from a drug library (13), the drug library (13) being adapted to store a plurality of drug data structures (130), each drug data structure (130) comprising a drug type entry (131) indicating a drug type and a dosage evolution entry (132) adapted to indicate whether a dose rate or a flow rate is to be maintained constant over time; and determine an updated drug dosage for the received drug type based on the dosage evolution entry (132).

Description

[0001] System and Method for Determining an Updated Drug Dosage

[0002] Description

[0003] The invention relates to a control system for an infusion pump, to an infusion pump with such a control system and to a method for determining an updated drug dosage.

[0004] For administering a drug to a patient in many situations a defined amount of the drug has to be provided to the patient in a defined time period. Commonly, a drug dosage is initially defined by a doctor and then set up, e.g., programmed into an infusion device.

[0005] Some therapies extend over weeks or even months. During such a time period, the patient’s body physique, such as the patient’s weight, may change. As an example, the patient’s weight may strongly change during the course of a cancer therapy.

[0006] A challenge in this regard is that therapeutic effects of some kinds of drugs (e.g., for antibiotics) rely on a dose rate being normalized to a body physique parameter such as the patient’s weight, while for other kinds of drugs (e.g., catecholamine drugs), a flow rate of a drug with a stable concentration in the fluid needs to be kept constant, irrespective of a possible change of the patient’s weight or other body physique parameter. Therefore, the doctor typically needs to determine the correct drug dosage every time the patient receives the drug over the course of the therapy. Notably, for many drugs it is very important to apply the correct drug dosage with a high precision, so care needs to be taken when determining and setting up the drug dosage for each administration. This has been found to be cumbersome and time consuming. It is an object of the instant invention to simplify the administration of drugs.

[0007] This object is achieved by means of a control system comprising the features of claim 1 .

[0008] Accordingly, a control system for an infusion pump comprises a processor assembly and memory. The memory stores instructions that, when executed by the processor assembly, cause the processor assembly to perform the following steps: receive a drug dosage and a drug type; read a drug data structure corresponding to the received drug type from a drug library, the drug library being adapted to store a plurality of drug data structures, each drug data structure comprising a drug type entry indicating a drug type and a dosage evolution entry adapted to indicate whether a dose rate or a flow rate is to be maintained constant over time; and determine an updated drug dosage for the received drug type based on the dosage evolution entry.

[0009] This is based on the idea to use a drug library stored in the memory and / or accessible to the control system to automatically determine the way how to calculate the updated drug dosage, so this does not have to be manually set up for every administration of the drug. As a result, for example when administering a given drug to a patient for the first time, a drug dosage and a drug type is determined once and provided to the control system, which then controls the infusion pump to provide the drug in accordance with the drug dosage. At a later point in time, when the patient returns to a second or further administration of the drug, the control system automatically determines whether a dose rate or a flow rate is to be maintained constant over time to determine the updated dose rate without a necessary intervention of a doctor. Here, the drug dosage (and the updated drug dosage) is either a dose rate or a flow rate. Using the dosage evolution entry, the control system thus can either calculate the updated drug dosage as a dose rate (e.g., by normalizing a given dose using a patient body physique parameter), or as a flow rate (e.g., by maintaining a flow rate determined at an earlier point in time unchanged).

[0010] Determining the updated drug dosage for the received drug type may be further based on patient data evolution. The patient data evolution may be indicative of a change of data of the patient from a first point in time to a later, second point in time. Therefore, the updated drug dosage can be determined using the patient data evolution. For example, the patient data evolution may be used for normalizing the updated drug dosage as a dose rate. Thus, it can be sufficient that caregiver personnel provide new patient data to the control system which then automatically determines the correct updated drug dosage, thereby further simplifying the administration of drugs. The memory may further store instructions that, when executed by the processor assembly, cause the processor assembly to perform the following step(s): receive a patient’s body physique (parameter(s)) at a first point of time; and / or receive a patient’s body physique (parameter(s)) at a second point of time after the first point of time. By this, the control system may determine the correct updated drug dosage precisely and in a particularly simple manner. The control system may determine the patient data evolution based on the patient’s body physique at the first point of time and the patient’s body physique at the second point of time.

[0011] As an example, the patient’s body physique (parameter(s)) may be or comprise one or more of the patient’s weight, the patient’s body surface area and the patient’s height. Several drugs need to be dosed based on one or more of such parameters. By providing this / these parameter(s) to the control system, the control system can automatically determine the correct updated drug dosage in a precise manner.

[0012] For example, when the dosage evolution entry indicates that the dose rate is to be maintained constant over time, the determination of the updated drug dosage may include an adaption of the flow rate to a change of the patient’s body physique between the first and second points of time. Alternatively, or in addition, when the dosage evolution entry indicates that the flow rate is to be maintained constant over time, the determination of the updated drug dosage may include maintaining the flow rate unchanged (e.g., even when resulting in a changed dose rate in accordance with the change of the patient’s body physique between the first and second points of time). This can further simplify the administration of drugs.

[0013] For example, the dose rate indicates a drug amount per unit of time normalized by the patient’s body physique (parameter(s)), e.g., the patient’s weight, the patient’s body surface area or the patient’s height.

[0014] Optionally, the patient’s body physique is received from another device via a communicative connection and / or via a user-actuable interface. This allows a simple and user-friendly control. The communicative connection may be via a wireless (e.g., RF or IR) or wired communication interface to name some examples.

[0015] Optionally, determining the updated drug dosage for the received drug type further comprises restricting the updated drug dosage to at least one of a predefined upper limit and a predefined lower limit. This allows to ensure a minimal drug dosage or to avoid exceeding a maximal drug dosage, e.g., in cases of strong variations of a patient’s body physique. The drug dosage and / or the updated drug dosage may indicate a dose rate and / or a flow rate.

[0016] The flow rate may indicate a drug volume per unit of time.

[0017] Optionally, the memory further stores instructions that, when executed by the processor assembly, cause the processor assembly to perform the following step(s): calculate a flow rate based on the updated drug dosage; and / or control the infusion pump to operate with a / the calculated flow rate. This allows a simple administration of drugs even in case when the updated drug dosage indicates an updated dose rate, e.g., by a change of the patient’s body physique.

[0018] The dosage evolution entries of the drug library may be further adapted to indicate that whether the dose rate or the flow rate is to be maintained constant over time is selectable by a user. For some or all drugs listed in the drug library, the control system may thus allow a user to overwrite an entry in the drug library. This provides flexibility while maintaining the simplified control in standard situations.

[0019] According to an aspect, an infusion pump is provided, characterized by the control system according to any aspect or embodiment described herein. The infusion pump may comprise an interface for receiving the drug dosage and / or the drug type. Regarding the advantages of the infusion pump, reference is made to the discussion of the control system above.

[0020] According to an aspect, a method for determining an updated drug dosage is provided. The method comprises receiving, by a processor assembly of a control system of an infusion pump, a drug dosage and a drug type; reading, by the processor assembly, a drug data structure corresponding to the received drug type from a drug library, the drug library storing a plurality of drug data structures, each drug data structure comprising a drug type entry indicating a drug type, and a dosage evolution entry adapted to indicate whether a dose rate or a flow rate is to be maintained constant over time; and determining, by the processor assembly, the updated drug dosage for the received drug type based on the dosage evolution entry. Regarding the advantages of the method, reference is made to the discussion of the control system above.

[0021] According to an aspect, a computer-readable storage medium is provided, comprising instructions that, when executed by a processor assembly of a control system for an infusion pump (e.g., by the processor assembly of the control system of any aspect or embodiment described herein), cause the processor assembly to perform the method described above. Regarding the advantages of this computer-readable storage medium, reference is made to the discussion of the control system above.

[0022] According to an aspect, a computer readable storage medium is provided, comprising a drug library, the drug library storing a plurality of drug data structures, each drug data structure comprising a drug type entry indicating a drug type and a dosage evolution entry indicating whether a dose rate or a flow rate is to be maintained constant over time. Regarding the advantages of this computer-readable storage medium, reference is made to the discussion of the control system above.

[0023] The idea underlying the invention shall subsequently be described in more detail by referring to the embodiments shown in the figures. Herein:

[0024] Fig. 1 shows an infusion pump for administering a fluid to a patient, the infusion pump comprising a control system;

[0025] Fig. 2 shows the control system of the infusion pump of Fig. 1 ; and

[0026] Fig. 3 shows a method for determining an updated drug dosage.

[0027] Subsequently, particularly an infusion pump, a control system and a method for determining an updated drug dosage shall be described. The embodiments described herein shall not be construed as limiting for the scope of the invention.

[0028] Fig. 1 illustrates an infusion pump 2. The infusion pump 2 comprises a housing 20 and a receptacle 22 arranged on the housing 20 to receive a syringe 3 (or other device for storing and / or conducting a fluid) therein.

[0029] A fluid container 30 of the syringe 3 is connected, via a connector 32, to a delivery line 4. In the present example, the fluid container 30 has the shape of a cylindrical barrel. The delivery line 4 is or may be connected to a patient for administering a fluid to the patient, e.g., via a catheter.

[0030] For installing the syringe 3 on the receptacle 22 of the infusion pump 2, the fluid container 30 of the syringe 3 is placed in the receptacle 22 and is mechanically connected to the housing 20 by means of a fixation device 23 of the infusion pump 2. By means of the fixation device 23, for example constituted by a releasable clamp element, the syringe 3 is secured within the receptacle 22 such that the fluid container 30 of the syringe 3 is held in position on the receptacle 22.

[0031] For delivering (medical) fluid F contained in the fluid container 30, a piston 31 of the syringe 3 can be pushed into the fluid container 30 in a pushing direction D. For this, the infusion pump 2 comprises a pusher device 21 movably arranged on the housing 20 of the infusion pump 2 and operatively connected to an electric drive device of the infusion pump 2.

[0032] To set up an operation of the infusion pump 2, the syringe 3 is installed and the pusher device 21 is (manually and / or electrically) moved towards a piston head of the piston 31 until the pusher device 21 comes into abutment with the piston head. For performing an infusion process the pusher device 21 is then moved (electrically, using the electric drive device) in the pushing direction D to move the piston 31 into the fluid container 30 for delivering the fluid F contained in the fluid container 30 via the delivery line 4 towards the patient.

[0033] Notably, the infusion pump 2 of Fig. 1 is a syringe pump; however, this is merely exemplary, and the infusion pump could also be, e.g., a volumetric pump or the like.

[0034] The infusion pump 2 further comprises a user interface 24 for inputting commands and, optionally, for outputting information. In the present example, the user interface 24 is a humanmachine interface (HMI). Here, the user interface 24 comprises a display 240 for outputting information, and at least one input means. In the example of Fig. 1 , the infusion pump 2 comprises a plurality of buttons 241 as input means. However, various other means for outputting and / or for inputting information are conceivable, such as a touchscreen, a communicatively connected device, e.g., a keyboard or a mouse, or the like.

[0035] The infusion pump 2 in the example of Fig. 1 also comprises a communication interface 25 for (e.g., electronic and / or optical) communication with another device. Here, the communication interface 25 comprises a socket with electric contacts. The communication interface 25 enables the infusion pump 1 to set up a communicative connection C with another (electronic) device. Therefore, a plug 5 is plugged into the socket. The communicative connection C is a wired network connection; however, other communicative connections are also conceivable. Alternatively or in addition, the infusion pump 1 may comprise a wireless communication interface (e.g., Wi-Fi, Bluetooth or the like) for optical or radio-frequency communications.

[0036] The infusion pump 2 of Fig. 1 further comprises a control system 1. The control system 1 is communicatively coupled with the user interface 24 and the communication interface 25. Fig. 2 schematically illustrates further details of the control system 1. The control system 1 comprises a processor assembly 10 and memory 11. The processor assembly 10 comprises one or more processors. The processor assembly 10 is configured to receive data provided via the user interface 24 and / or via the communication interface 25. The processor assembly 10 is also configured to provide data via the user interface 24 and / or via the communication interface 25.

[0037] The memory 11 is a computer-readable medium. The memory 11 of the present example is non-volatile. The memory 11 may comprise one or more memory chips. The memory 11 of the control system 1 optionally also comprise volatile memory. The memory 11 stores instructions 12. In the present example, the memory 11 also stores a drug library 13; however, the drug library 13 could also be stored in a memory of another device communicatively coupled with the control system 1 via the (wired or wireless) communicative connection C, and accessible to the control system 1 via the communicative connection C.

[0038] The instructions 12 are executable by the processor assembly 10. When executed by the processor assembly 10, the instructions 12 cause the processor assembly 10 to perform steps of a method that will be described in more detail below with reference to Fig. 3.

[0039] The drug library 13 is adapted to store a plurality of drug data structures 130. Each drug data structure 130 is associated with one of a plurality of drugs. Each drug data structure 130 comprises a drug type entry 131. The drug type entry 131 indicates a drug type. For example, the drug type entry 131 comprises a serial number, a name or another kind of a unique identifier.

[0040] Each drug data structure 130 further comprises a dosage evolution entry 132. The dosage evolution entry 132 is adapted to indicate whether a dose rate or a flow rate is to be maintained constant over time. The dosage evolution entry 132 may be a 1 -bit information field, wherein “0” indicates that the dose rate is to be maintained constant over time, and “1” indicates that the flow rate is to be maintained constant over time (or vice versa). That is, each drug data structure 130 associates each of a plurality of different drugs with an information about the drug dosage of the respective drug.

[0041] The drug dosage may either be a dose rate or a flow rate. The dose rate indicates a drug amount (e.g., a value measured in ml, mg, microgram or the like) per unit of time (e.g., second, minute, hour or the like) normalized by the patient’s body physique, such as weight (e.g., in kg) or body surface area (e.g., in cm2or m2). Thus, a dose rate may specify an amount of a given drug per unit of time and per unit of the body physique. As an example, the dose rate could be calculated (by the control system 1) as follows: dose rate = amount of drug I (unit of time * unit of body physique).

[0042] On the other hand, the flow rate indicates a drug amount, e.g., volume, per unit of time. As an example, the flow rate could be calculated (by the control system 1) as follows: flow rate = amount of drug I unit of time.

[0043] For the purpose of illustration, in the following a specific example shall be described. Traditionally, infusion pumps are regularly programmed in ml / h units, i.e. , using a flow rate. For example, an infusion pump could be programmed to provide a flow rate of 2.5 ml / h for an exemplary patient with a weight of 75 kg. The drug to be administered exemplarily has a concentration of 500 mg 140 ml, i.e., 12,5 mg / ml.

[0044] To be well adapted to patient characteristics, one could provide an infusion pump that can be programmed in units normalized by the weight (or by the body surface area) of the patient. For example, the dose rate corresponding to 2.5 ml / h could correspond to 7 pg / kg / min. Therefore, an infusion pump could be programmed at a dose rate of 7 pg / kg / min (or a different value in that unit depending on the drug type and patient weight). This allows users to avoid a manual conversion into ml / h, avoiding potential computation mistakes. The body physique parameter such as the weight may also be provided to the infusion pump.

[0045] When the patient happens to change in weight (as an example), then the question arises whether the flow rate shall be adapted to the change of the weight, or whether the flow rate shall remain unchanged.

[0046] If the infusion was programmed with a normalized dose rate, e.g., 7 pg / kg / min, and the patient changed (e.g., lost) weight since this first setup, then the flow rate at which the infusion pump provides the drug would have to be changed, e.g., to 2.4 ml / h.

[0047] However, in some case, the value of the dose rate (e.g., 7 pg / kg / min) has been obtained after a fine tuning based on physiological signs of the patient. In such cases and for various specific drugs, the flow rate should not be changed and, in this example, maintained at 2.5 ml / h. The new setting of the dose rate would then change to, e.g., 7.29 pg / kg / min. The choice between maintaining the dose rate or the flow rate constant typically depends on the kind of drug being infused, and usually has to be made by a doctor. Other caregiver personnel are often not even authorized to make this decision. In addition, programming the correct dosage often needs double checking to avoid accidental mistakes and is therefore cumbersome.

[0048] Each drug data structure 130 further comprises one or more optional entries 133 for storing additional drug-specific data.

[0049] To provide an example, a first drug data structure 130 may indicate a specific antibiotic in the drug type entry 131 and indicate that the dose rate is to be maintained constant over time. Further, a second drug data structure 130 may indicate a specific catecholamine in the drug type entry 131 and indicate that the flow rate is to be maintained constant over time. When reading the drug data structure 130 corresponding to a received drug type, the drug data structure 130 comprising the drug type entry 131 corresponding to the received drug type is read. For example, when the received drug type is the specific antibiotic, the first drug data structure 130 is read.

[0050] Turning now to Fig. 3, a method for determining an updated drug dosage will be described. The control system 1 in accordance with Fig. 2 is adapted to perform the steps of the method. More specifically, the memory 11 of the control system 1 stores instructions 12 that when executed by the processor assembly 10 of the control system 1 , cause the processor assembly 10 to perform the steps of the method.

[0051] At step S1 , a drug dosage and a drug type are received, e.g., by the processor assembly 10 of the control system 1 of the infusion pump 2. The drug dosage may be provided to the processor assembly 10 via the user interface 24 and / or via the communication interface 25. Also, the drug type may be provided to the processor assembly 10 via the user interface 24 and / or via the communication interface 25. For example, drug dosage and drug type may be stored in a database (in the memory 11 or in a communicatively connected device) and associated with a patient. Then, e.g., an identification of the patient can be provided to the processor assembly 10, and the processor assembly 10 receives the drug dosage and drug type by querying the database with the patient identification.

[0052] At step S2 the drug data structure 130 corresponding to the received drug type is received from the drug library 13, e.g., by the processor assembly 10. As described above, the drug library 13 stores a plurality of drug data structures 130, each drug data structure 130 comprising a drug type entry 131 indicating a drug type and a dosage evolution entry 132 adapted to indicate whether a dose rate or a flow rate is to be maintained constant over time.

[0053] At step S3 and at a first point of time, a patient’s body physique is received, e.g., by the processor assembly 10, in particular via at least one of the interfaces 24, 25. Based on the patient’s body physique, a patient data evolution may be determined by the processor assembly 10. The patient’s body physique is a parameter indicating one of the patient’s weight, the patient’s body surface area and the patient’s height. The patient data evolution, e.g., is an indication of a change of the patient’s body physique.

[0054] Notably, step S3 may be performed in an arbitrary order with regards to steps S1 and S2, e.g., before step S1 or between steps S1 and S2.

[0055] Optionally, when the dosage evolution entry 132 drug data structure 130 read from the drug library 13 is further adapted to indicate that whether the dose rate or the flow rate is to be maintained constant over time is selectable by a user, at step S4, the processor assembly 10 causes the user interface 24 to prompt the user to select whether the dose rate or the flow rate is to be maintained constant over time. Alternatively, the processor assembly 10 may send a request for such a prompt via the communication interface 25.

[0056] At step S5, the updated drug dosage for the received drug type is determined, e.g., by the processor assembly 10, based on the read or received dosage evolution entry. Optionally, step S5 further comprises restricting the updated drug dosage to at least one of a predefined upper limit and a predefined lower limit. Such a restriction may be performed based on an additional entry 133 of the drug data structure 130, or it may be based on a user input. The drug dosage and the updated drug dosage indicate a dose rate or a flow rate. Determining the updated drug dosage for the received drug type may comprise calculating a flow rate, by the processor assembly 10, based on the updated drug dosage. In case that the updated drug dosage comprises a flow rate, this may be omitted. In case that the updated drug dosage is a dose rate, the processor assembly 10 may calculate the flow rate corresponding to the dose rate, e.g., as described further above.

[0057] Further, the instructions 12 cause the processor assembly 10 to control the infusion pump 2 to operate with the (determined or calculated) flow rate. For example, the piston 31 is driven with a corresponding speed. At step S6 it is determined whether a new administration of the drug shall be performed. This may happen at a second point of time later than the first point of time. If this is the case (“Y”), the method returns to step S3, where the processor assembly 10 receives the patient’s body physique at the second point of time.

[0058] Then, at step S5, when the dose rate is to be maintained constant over time, the determination of the updated drug dosage includes an adaption of the flow rate to a change of the patient’s body physique between the first and second points of time, and when the dosage evolution entry 132 indicates that the flow rate is to be maintained constant over time, the determination of the updated drug dosage includes maintaining the flow rate resulting in a changed dose rate in accordance with the change of the patient’s body physique between the first and second points of time.

[0059] The method stops at step S7 if no further administration of the drug to the patient shall be performed.

[0060] The dosage evolution entry 132 may be adapted to assume one of at least (or exactly) two different states, or one of at least (or exactly) three different states. The two different states may (1.) indicate that the dose rate is to be maintained constant over time, and (2.) indicate that the flow rate is to be maintained constant over time. The three different states may (1.) indicate that the dose rate is to be maintained constant over time, (2.) indicate that the flow rate is to be maintained constant over time, and (3.) indicate that the user shall be prompted to input whether the dose rate or the flow rate is to be maintained constant over time.

[0061] The idea of the invention is not limited to the embodiments described above but may be implemented in a different fashion.

[0062] List of Reference Numerals

[0063] I Control system

[0064] 10 Processor assembly

[0065] I I Memory

[0066] 12 Instructions

[0067] 13 Drug library

[0068] 130 Drug data structure

[0069] 131 Drug type entry

[0070] 132 Dosage evolution entry

[0071] 133 Entry

[0072] 2 Infusion pump

[0073] 20 Housing

[0074] 21 Pusher device

[0075] 22 Receptacle

[0076] 23 Fixation device

[0077] 24 User interface

[0078] 240 Display

[0079] 241 Button

[0080] 25 Communication interface

[0081] 3 Syringe

[0082] 30 Fluid container

[0083] 31 Piston

[0084] 32 Connector

[0085] 4 Delivery line

[0086] 5 Plug

[0087] C Communicative connection

[0088] D Pushing direction

[0089] F Fluid

Claims

Claims:

1. A control system (1) for an infusion pump (2), comprising: a processor assembly (10); and memory (11), the memory (11) storing instructions (12) that, when executed by the processor assembly (10), cause the processor assembly (10) to perform the following steps: o receive a drug dosage and a drug type; o read a drug data structure (130) corresponding to the received drug type from a drug library (13), the drug library (13) being adapted to store a plurality of drug data structures (130), each drug data structure (130) comprising a drug type entry (131) indicating a drug type and a dosage evolution entry (132) adapted to indicate whether a dose rate or a flow rate is to be maintained constant over time; and o determine an updated drug dosage for the received drug type based on the dosage evolution entry (132).

2. The control system (1) according to claim 1 , characterized in that determining the updated drug dosage for the received drug type is further based on patient data evolution.

3. The control system (1) according to any of the preceding claims, characterized in that the memory (11) further stores instructions (12) that, when executed by the processor assembly (10), cause the processor assembly (10) to perform the following steps: o receive a patient’s body physique at a first point of time; and o receive a patient’s body physique at a second point of time after the first point of time.

4. The control system (1) according to claim 3, characterized in that the patient’s body physique is one of the patient’s weight, the patient’s body surface area and the patient’s height.

5. The control system (1) according to claim 3 or 4, characterized in that when the dosage evolution entry (132) indicates that the dose rate is to be maintained constant over time,the determination of the updated drug dosage includes an adaption of the flow rate to a change of the patient’s body physique between the first and second points of time, and when the dosage evolution entry (132) indicates that the flow rate is to be maintained constant overtime, the determination of the updated drug dosage includes maintaining the flow rate resulting in a changed dose rate in accordance with the change of the patient’s body physique between the first and second points of time.

6. The control system (1) according to any of claims 3 to 5, characterized in that the dose rate indicates a drug amount per unit of time normalized by the patient’s body physique.

7. The control system (1) according to any of claims 3 to 6, characterized in that the patient’s body physique is received from another device via a communicative connection (C), or via a user-actuable interface (24).

8. The control system (1) according to any of the preceding claims, characterized in that determining the updated drug dosage for the received drug type further comprises restricting the updated drug dosage to at least one of a predefined upper limit and a predefined lower limit.

9. The control system (1) according to any of the preceding claims, characterized in that the drug dosage and / or the updated drug dosage indicates a dose rate and / or a flow rate, wherein the flow rate indicates a drug volume per unit of time.

10. The control system (1) according to any of the preceding claims, characterized in that the memory (11) further stores instructions (12) that, when executed by the processor assembly (10), cause the processor assembly (10) to perform the following steps: o calculate a flow rate based on the updated drug dosage; and o control the infusion pump (2) to operate with the calculated flow rate.11 . The control system (1) according to any of the preceding claims, characterized in that the dosage evolution entries (132) of the drug library (13) are further adapted to indicate thatwhether the dose rate or the flow rate is to be maintained constant over time is selectable by a user.

12. An infusion pump (2), characterized by the control system (1) according to any of the preceding claims and an interface (24, 25) for receiving the drug dosage and / or the drug type.

13. A method for determining an updated drug dosage, comprising: receiving (S1), by a processor assembly (10) of a control system (1) of an infusion pump (2), a drug dosage and a drug type; reading (S2), by the processor assembly (10), a drug data structure (130) corresponding to the received drug type from a drug library (13), the drug library (13) storing a plurality of drug data structures (130), each drug data structure (130) comprising a drug type entry (131) indicating a drug type and a dosage evolution entry (132) adapted to indicate whether a dose rate or a flow rate is to be maintained constant over time; and determining (S5), by the processor assembly (10), the updated drug dosage for the received drug type based on the dosage evolution entry.

14. A computer readable storage medium (11), comprising instructions (12) that, when executed by a processor assembly (10) of a control system (1) for an infusion pump (2), cause the processor assembly (10) to perform the method of claim 13.

15. A computer-readable storage medium (11), comprising a drug library (13), the drug library (13) storing a plurality of drug data structures (130), each drug data structure (130) comprising a drug type entry (131) indicating a drug type and a dosage evolution entry (132) indicating whether a dose rate or a flow rate is to be maintained constant over time.

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