Gradient coil unit and magnetic resonance apparatus

Abstract

The utility model relates to a gradient coil unit, which comprises a conductor structure unit, at least two cooling loops, an interface unit, a leading-in unit, a potting material and a connecting unit, each cooling loop in the at least two cooling loops is respectively provided with a cooling input end, the interface unit is provided with at least two passages, and the leading-in unit is connected with the conductor structure unit. The at least two passages each have a first end and a second end and are formed between the first end and the second end, one of the at least two first ends and one of the at least two cooling inputs being connected to each other via a first connection. The lead-in unit and the interface unit can be connected via the connection unit such that a flow of a cooling medium from the lead-in unit via the at least two channels of the interface unit into the at least two cooling circuits is possible, and the conductor structure unit, the at least two cooling circuits, the first connection and the interface unit are at least partially potting one another by means of a potting compound, the introduction unit has no permanent connection to the potting compound.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gradient coil unit, which comprises a cooling circuit and an interface unit, and the interface unit constitutes a cooling circuit for supplying a cooling medium, and a magnetic resonance apparatus comprising such a gradient coil unit. BACKGROUND

[0002] In a magnetic resonance apparatus, the body part to be examined of the examination subject, in particular a patient, is usually subjected to a relatively high main magnetic field, for example 1.5 Tesla or 3 Tesla, by means of a main magnet. In the case of magnetic resonance imaging (MR imaging), gradient pulses are applied by means of a gradient coil unit. In addition, high-frequency radio frequency pulses (HF pulses), in particular excitation pulses, are emitted by means of suitable antenna devices via a radio frequency antenna unit, which cause the nuclear spins of the specific atoms resonantly excited by these radio frequency pulses to flip through a defined flip angle relative to the magnetic field lines of the main magnetic field. Upon relaxation of the nuclear spins, radio frequency signals, so-called magnetic resonance signals, are emitted, which are received by means of a suitable radio frequency antenna and then further processed. Finally, the desired image data can be reconstructed from the raw data thus acquired.

[0003] Therefore, for a specific measurement, a specific magnetic resonance control sequence (MR control sequence), also called pulse sequence, is to be emitted, which consists of a series of radio frequency pulses, for example excitation pulses and refocusing pulses, and gradient pulses to be emitted in a coordinated manner along different spatial directions on different gradient axes in matching time. A readout window is set in matching time, which presets a time period for detecting the inductively caused magnetic resonance signals.

[0004] The gradient coil unit usually comprises three primary coils and three secondary coils corresponding thereto. The primary coils are usually designed for generating magnetic field gradients in spatial directions, in particular within a patient receiving region. The magnetic field gradients are usually first-order and / or linear-order magnetic fields, in particular magnetic fields whose amplitudes linearly increase along the spatial directions. The primary coils are usually arranged on a cylinder surface. The primary coils usually comprise four conductor structures. The four conductor structures are usually arranged symmetrically to each other and / or respectively in a quarter of the cylinder surface. Each of the four conductor structures is usually designed saddle-shaped. The conductor structures usually define a geometric arrangement of electrical conductors, in particular arranged on a cylinder lateral surface, which is preferably designed at least partially helically. The conductor structures comprised by the gradient coil unit are usually collectively referred to as a conductor structure unit.

[0005] By operating the primary coil with an electric current, which has an amplitude of several hundred A and is subjected to frequent and rapid changes in the direction of the current together with rise and fall rates of several hundred kA / s, a magnetic field gradient is generated. The magnetic field gradient is thus a magnetic field which changes over time. Stronger magnetic field gradients and / or rise and fall rates generally enable faster recording of raw data and / or higher-resolution image data. Particularly when examining the head of an examination object, particularly when recording diffusion-weighted and / or when using a magnetic resonance device with a main magnetic field of more than 3 Tesla, particularly strong magnetic field gradients of up to 200 mT / m with rise and fall rates of up to 200 T / s / m, in special cases up to 500 T / s / m, are desirable. Here, the loss power is generated in the form of heat, which must be particularly effectively dissipated in order to guarantee the continuous operation of the gradient coil unit.

[0006] To this end, the gradient coil unit generally comprises one or more cooling circuits. A cooling circuit is understood in the context of the present disclosure to be a conduction system which has a cooling input and a cooling output and constitutes a directed transport of a cooling medium from the cooling input to the cooling output and / or vice versa. The cooling circuit can also constitute a hollow region of an electrical conductor which is constituted by a hollow conductor of the conductor structure unit. If the cooling circuit is traversed by a cooling medium, heat can be dissipated from the gradient coil unit. The use of multiple cooling circuits generally increases the cooling power. The multiple cooling circuits can be supplied with cooling medium from a single cooling medium reservoir. To this end, a junction of the cooling medium reservoir to the multiple cooling circuits is necessary. The cooling circuit, the cooling medium and the cooling medium reservoir can together be referred to as a cooling device. Utility model content

[0007] The object underlying the present utility model is to propose a gradient coil unit with a robust and flexibly usable cooling circuit. The object is achieved by the features of the present invention. Advantageous design variants are described herein.

[0008] The gradient coil unit according to the present utility model comprises a conductor structure unit, at least two cooling circuits, an interface unit, an introduction unit, a potting compound and a connection unit. Each of the at least two cooling circuits has a cooling input.

[0009] The interface unit has at least two passages which each have a first end and a second end and are each channelled and / or ducted between the first end and the second end. The at least two passages preferably each enable a cooling medium to flow through the interface unit from a respective one of the first ends, in particular to a respective one of the second ends and / or vice versa. A respective one of the at least two first ends and a respective one of the at least two cooling inputs are connected to one another via a respective first connection, in particular a connector. The first connection is preferably comprised by the gradient coil unit. The introduction unit can be connected to the interface unit, in particular to the second end of the interface unit, via the connection unit, such that it is possible for the cooling medium to flow from the introduction unit via the at least two passages of the interface unit into the at least two cooling circuits.

[0010] The conductor structure unit, the at least two cooling circuits, the first connection and the interface unit are at least partially potted with a potting compound. The introduction unit does not have a permanent connection to the potting compound. In particular, the introduction unit is not potted with the interface unit and / or the conductor structure unit and / or the at least two cooling circuits. The interface unit generally has a permanent connection to the at least two cooling circuits. The first connection is preferably designed to be permanent. The potting compound can comprise a thermosetting plastic and / or an epoxy resin. The first end and / or the second end is generally designed as an opening and / or does not have an obstacle. The passage is generally open at the first end and at the second end, such that the passage is a cavity which penetrates the interface unit and / or an opening which penetrates the interface unit.

[0011] The gradient coil unit according to the application is designed in such a way that the plurality of cooling circuits can be individually conducted outwards via the passages of the interface unit, in particular into a region outside the potting compound. In this way, the at least two cooling circuits are individually accessible from outside the potting compound via the individual openings, in particular the second ends, such that after manufacture, in particular after potting the gradient coil unit, the at least two cooling circuits are individually accessible and can be individually maintained. However, the interface unit enables the aggregation of the at least two cooling circuits which can be compactly conducted outwards via the interface unit, in particular into a region outside the potting compound.

[0012] The introduction unit which can be joined to the interface unit via the connection unit enables a robust and at the same time flexible application of the cooling circuits. Depending on the design of the introduction unit, the wiring of the individual cooling circuits can be matched afterwards, for example in order to optimize the fluid mechanics or the heat distribution. Furthermore, after potting, the at least two cooling circuits can be individually checked, for example in terms of tightness. Additionally, the individual cooling circuits can be individually repaired.

[0013] The introduction unit is preferably provided at the interface unit and / or connected with the interface unit in time after the potting interface unit, the conductor structure unit and / or the at least two cooling circuits in the scope of the production process. Instead of the introduction unit, a functional unit as a placeholder for the introduction unit can be provided at the interface unit and / or connected with the interface unit in the production process, in particular when potting the interface unit, the conductor structure unit and / or the at least two cooling circuits. This enables a quick and robust production of such a gradient coil unit.

[0014] One embodiment of the gradient coil unit proposes that the region of the interface unit comprising the second end portion and / or the second end portion is provided outside the potting compound. The interface unit can hereby be a raised portion and / or a bump of the surface of the gradient coil unit, in particular outside the potting compound. According to this embodiment, the interface unit is hereby only partially surrounded by the potting compound. According to this, the interface unit and in particular the second end portion is particularly easily accessible. Furthermore, this enables a simple positioning of the introduction unit at the interface unit and a robust assembly.

[0015] One embodiment of the gradient coil unit proposes that the first connection, in particular the connector, comprises a sealing element. The sealing element can comprise an O-ring. The sealing element can prevent a leakage in the region of the first connection and / or ensure that the cooling medium can be conducted from the interface unit, in particular from the passage, into the cooling circuit.

[0016] One embodiment of the gradient coil unit proposes that the first connection, in particular the connector, comprises a quick connection, in particular a push-in connection. This enables a particularly robust first connection, which is stable in particular also when potting and when hardening of the potting compound.

[0017] One embodiment of the gradient coil unit proposes that the connection unit is reversibly detachably configured. According to this, the introduction unit and the interface unit can be connected with each other in a reversible manner. According to this, the form and / or type of the introduction unit can also be selected after potting in correspondence with the required use of the cooling circuit and in association with the connection unit. According to this embodiment, the introduction unit can be flexibly replaced. This enables a flexible use of the cooling circuit.

[0018] One embodiment of the gradient coil unit proposes that the connection unit has at least two connection points. The connection unit with at least two connection points enables a particularly robust and stable connection between the introduction unit and the interface unit.

[0019] One embodiment of the gradient coil unit proposes that the connection unit comprises a threaded connection. The threaded connection is low-cost and at the same time enables a stable connection between the introduction unit and the interface unit.

[0020] One embodiment of the gradient coil unit proposes that the introduction unit has a distributor unit with at least two outlets and one main inlet, wherein each of the at least two outlets engages with each of the at least two second end portions when the connection unit is closed. The connection unit can be referred to as closed when the introduction unit and the interface unit are fastened to each other. In this way, the distributor unit enables the distribution of the cooling medium to the at least two outlets and thus to the at least two channels and the at least two cooling circuits in dependence on the direction of flow of the cooling medium through the distributor unit and / or the collection of the cooling medium for the outflow via the main inlet in a collected manner. The distributor unit can also comprise more than one main inlet. The distributor unit can connect the plurality of outlets and the main inlet to each other. In dependence on the design and selection of the distributor unit, the described embodiment of the gradient coil unit enables a particularly good and individualized handling of the individual cooling circuits.

[0021] One embodiment of the gradient coil unit proposes that the at least two outlets and the main inlet form a common cavity, which can be traversed by the cooling medium. The cooling medium can preferably completely traverse the cavity. The described embodiment enables a low-cost and functionally normal distributor unit.

[0022] One embodiment of the gradient coil unit proposes that the connection unit comprises a sealing element, which is arranged in particular in the closed state of the connection unit between each outlet and each second end portion. The sealing element can comprise an O-ring. The sealing element can prevent leaks in the region of the connection unit and / or ensure that the cooling medium can be conducted from the interface unit into the introduction unit.

[0023] One embodiment of the gradient coil unit proposes that the gradient coil unit additionally comprises an introduction hose, which can be reversibly engaged with the main inlet. The introduction hose can connect the gradient coil unit with a cooling medium reservoir. In this way, the introduction hose can be fitted separately after the fastening of the introduction unit at the interface unit. The reversible engagement of the introduction hose enables a particularly flexible positioning and installation of the gradient coil unit.

[0024] One embodiment of the gradient coil unit proposes that the gradient coil unit, in particular the interface unit and the introduction unit, are designed in such a way that the cooling medium flowing in through the main inlet is conducted in such a way that a first cooling circuit of the at least two cooling circuits is supplied by the cooling medium via a first channel of the at least two channels and a second cooling circuit of the at least two cooling circuits is supplied by the cooling medium via a second channel of the at least two channels.

[0025] One embodiment of the gradient coil unit proposes that the cooling medium can be conducted from the at least two cooling circuits via the interface unit and the introduction unit when the flow direction of the cooling medium is reversed. In this way, the introduction unit is flexibly usable.

[0026] One embodiment of the gradient coil unit proposes that the interface unit and / or the introduction unit comprises an electrically insulating material, in particular plastic and / or ceramic. This material effects an electrical insulation of the cooling medium in the cooling circuit with respect to the electric current in the conductor structure unit. This ensures a safe functionality of the gradient coil unit.

[0027] Furthermore, the utility model discloses a magnetic resonance device with a main magnet, a radio frequency antenna unit, a cooling medium reservoir and a gradient coil unit according to the utility model connected with the cooling medium reservoir.

[0028] The cooling medium reservoir usually comprises a container and a cooling medium. The cooling medium reservoir can comprise a pump for generating a flow of cooling medium. The at least two cooling circuits are usually connected with the cooling medium reservoir, in particular connected in such a way that a flow of cooling medium from the cooling medium reservoir through the at least two cooling circuits is possible. The magnetic resonance device can also comprise a plurality of cooling medium reservoirs and the gradient coil unit can comprise at least four cooling circuits, wherein the plurality of cooling medium reservoirs supplies the same cooling circuit of the at least four cooling circuits with cooling medium or each cooling medium reservoir supplies two cooling circuits of the at least four cooling circuits.

[0029] Embodiments of the magnetic resonance device according to the utility model are constituted analogously to the embodiments of the gradient coil unit according to the utility model. The advantages of the magnetic resonance device according to the utility model basically correspond to the previously described advantages of the gradient coil unit according to the utility model. The features, advantages or alternative embodiments mentioned here can also be transferred to the other claimed subject matters and vice versa. BRIEF DESCRIPTION OF DRAWINGS

[0030] Further advantages, features and details of the utility model are derived from the embodiments described below and from the attached drawings. The drawings show:

[0031] Figure 1 a first perspective view of a first embodiment of a gradient coil unit according to the utility model,

[0032] Figure 2 a first perspective view of a second embodiment of an interface unit and an introduction unit of a gradient coil unit according to the utility model,

[0033] Figure 3 a second perspective view of a third embodiment of an interface unit and an introduction unit of a gradient coil unit according to the utility model, and

[0034] Figure 4 a schematic view of a magnetic resonance device according to the utility model. DETAILED DESCRIPTION

[0035] Figure 1 A first perspective schematic view of a first embodiment of a gradient coil unit according to the application is shown. The gradient coil unit comprises a conductor structure unit 30, which in the shown embodiment comprises electrical conductors 29. The gradient coil unit comprises two cooling circuits 31a, 31b, an interface unit 40, a lead-in unit 50, a potting 60 and in Figure 1 the connection unit 45, which is not shown in detail. Each of the two cooling circuits 31a, 31b has a cooling input 32a, 32b, respectively. In the shown case, each of the two cooling circuits 31a, 31b has a cooling output 33a, 33b, respectively. A cooling medium can flow within the cooling circuits 31a, 31b generally from the respective cooling input 32a, 32b to the respective cooling output 33a, 33b.

[0036] The interface unit 40 has two passages 44a, 44b, which are channelled and / or ducted and which each enable a flow of cooling medium through the interface unit 40. The conductor structure unit 30 and the two cooling circuits 31a, 31b are completely surrounded by the potting 60, in particular are potted with the potting 60 from one another. The interface unit 40 is at least partially surrounded by the potting 60. The lead-in unit 50 is arranged outside the potting 60 and / or is not potted with the potting 60.

[0037] Figure 2 A first perspective schematic view of a second embodiment of the interface unit 40 and the lead-in unit 50 of a gradient coil unit according to the application is shown. Figure 2 A region of the gradient coil unit is shown in detail, which comprises the interface unit 40 and the lead-in unit 50 of the first embodiment shown in Figure 1 In this figure, in particular the illustration of the conductor structure unit 30 and the cooling circuits 31a, 31b is omitted. This is in line with the illustration in Figure 2 the connection and / or arrangement of the components shown in Figure 1 The shown interface unit 40 has more than two passages 44a, 44b, namely six passages, wherein for better visibility only two passages 44a, 44b with corresponding properties are more precisely designated.

[0038] It is shown that the two passages 44a, 44b each have a first end 41a, 41b and a second end 42a, 42b and each enable a flow of cooling medium through the interface unit 40 from the respective one first end 41a, 41b towards the respective one second end 42a, 42b and / or vice versa. The respective one first end 41a, 41b and the respective one cooling input 32a, 32b are connected to one another via a first connection 35. For the sake of visibility, in Figure 2Only one first connection 35 is shown in the middle.

[0039] Furthermore, a connection unit 45 is shown, which connects the introduction unit 50 with the interface unit 40, in particular with its second end portions 42a, 42b, in such a way that a flow of cooling medium from the introduction unit 50 into the at least two cooling circuits 31a, 31b via the two passages 44a, 44b of the interface unit 40 is possible. In the case shown, the connection unit 45 has two connection points 46a, 46b at which the connection unit 45 is reversibly detachable. The interface unit 40 and the introduction unit 50 are hereby generally reversibly detachably connected to one another. To this end, the connection unit 45 can have, for example, a threaded connection at the connection points 46a, 46b.

[0040] The region of the connection unit 45 and the interface unit 40, which comprises the first end portions 42a, 42b, in particular the second end portions 42a, 42b, is arranged outside the potting 60 and in particular is not potted with the introduction unit 50. The introduction unit 50 also has no permanent connection with the potting 60 and in particular is not potted with the interface unit 40 and / or the connection unit 45. The first connection 35 is generally potted with further components, for example the interface unit 40 and the cooling circuits 31a, 31b, by means of the potting 60. The first connection 35, in particular the connector, comprises a sealing element and in the case shown is configured as a quick connection, in particular a push-in connection.

[0041] The introduction unit 50 comprises a distributor unit 51 having two outlets 52a, 52b and a main inlet 53. When the connection unit 45 is closed, one outlet 52a, 52b engages in each case with one second end portion 42a, 42b. Furthermore, the connection unit 45 comprises a sealing element 47, which in particular in the closed state of the connection unit 45 is arranged between one outlet 52a, 52b and one second end portion 42a, 42b. The two outlets 52a, 52b and the main inlet 53 form a common cavity, which is flowable through by cooling medium. The interface unit 40 and the introduction unit 50 are designed in such a way that cooling medium flowing in through the main inlet 53 is conducted in such a way that the first cooling circuit 31a is supplied with cooling medium via the first passage 44a and the second cooling circuit 31b is supplied with cooling medium via the second passage 44b. In particular, cooling medium can be conducted out of the two cooling circuits 31a, 31b via the interface unit 40 and the introduction unit 50 when the flow direction of the cooling medium is reversed. The gradient coil unit can additionally comprise an introduction hose, which is reversibly engageable with the main inlet, not shown in detail. Figure 2 The interface unit 40 and / or the introduction unit 50 comprise an electrically insulating material, in particular plastic and / or ceramic.

[0042] Figure 3A second perspective view of the third embodiment of the interface unit and the lead-in unit of the gradient coil unit according to the utility model is shown. The third embodiment corresponds to the second embodiment shown in Figure 2 the second embodiment shown in, wherein the second perspective is perpendicular to the first perspective and shows, in particular, the Figure 2 top view of the second embodiment shown in, wherein the plane of the cross section is defined by the second end portions 42a, 42b and the arrangement perpendicular to the first perspective.

[0043] Figure 4 A schematic view of a magnetic resonance apparatus 11 according to the utility model is shown. The magnetic resonance apparatus 11 comprises a detector unit 13 having a main magnet 17 for generating a strong and in particular constant main magnetic field 18 parallel to a longitudinal direction, in particular parallel to a column axis. Furthermore, the magnetic resonance apparatus 11 has a column-shaped patient receiving region 14 for accommodating a patient 15, wherein the patient receiving region 14 is column-shapedly surrounded in a circumferential direction by the detector unit 13. The patient 15 can be pushed into the patient receiving region 14 by means of a patient support device 16 of the magnetic resonance apparatus 11. The detector unit 13 further has a radio frequency antenna unit 20, which in the case shown is embodied as a body coil fixedly integrated into the magnetic resonance apparatus 11, and a radio frequency antenna control unit 29 for exciting a polarization occurring in the main magnetic field 18 generated by the main magnet 17. The radio frequency antenna control unit 20 is actuated by the radio frequency antenna control unit 29 and emits high-frequency radio frequency pulses into an examination space, which is essentially formed by the patient receiving region 14.

[0044] Furthermore, the detector unit 13 has a gradient coil unit 19 according to the utility model for position encoding during imaging. The gradient coil unit 19 is actuated by means of a gradient control unit 28. The magnetic resonance apparatus 11 further comprises a cooling medium reservoir 12, which is connected to the gradient coil unit 19. In order to show the gradient coil unit 19 in detail, reference is made in particular to Figures 1 to 3 .

[0045] In order to control the main magnet 17, the gradient control unit 28 and the radio frequency antenna control unit 29, the magnetic resonance apparatus 11 has a control unit 24. The control unit 24 centrally controls the magnetic resonance apparatus 11, for example, executes a magnetic resonance control sequence. The magnetic resonance apparatus 11 has a display unit 25. Furthermore, the magnetic resonance apparatus 11 has an input unit 26 by means of which information and / or control parameters can be input by a user during a measurement process. The control unit 24 can comprise the gradient control unit 28 and / or the radio frequency antenna control unit 29 and / or the display unit 25 and / or the input unit 26.

[0046] It goes without saying that the shown magnetic resonance apparatus 11 can comprise other components which a magnetic resonance apparatus 11 generally has. The general working principle of a magnetic resonance apparatus 11 is also known to the person skilled in the art, so that a detailed description of said other components is dispensed with.

[0047] Although the details of the application are described and illustrated by preferred embodiments, the application is not limited to the disclosed examples and other variants can be derived therefrom by the person skilled in the art without departing from the scope of the application. Irrespective of the grammatical gender of the specific terms, persons with a male, female gender identity are included.

Claims

1. Gradient coil unit, comprising a conductor structure unit, at least two cooling circuits, an interface unit, a lead-in unit, a potting and a connection unit, wherein - each of the at least two cooling circuits has a cooling input, respectively, - the interface unit has at least two passages, which have a first end and a second end, respectively, and which are channelled and / or ducted between the first and the second end, respectively, - each of at least two first ends and each of at least two cooling inputs are connected to each other via a first connection, respectively, - the lead-in unit is connectable to the interface unit via the connection unit, such that a flow of a cooling medium from the lead-in unit into the at least two cooling circuits via the at least two passages of the interface unit is possible, - the conductor structure unit, the at least two cooling circuits, the first connection and the interface unit are at least partially potted with the potting from each other, and - the lead-in unit has no permanent connection to the potting.

2. Gradient coil unit according to claim 1, wherein the second end is arranged outside the potting.

3. Gradient coil unit according to claim 1 or 2, wherein the first connection comprises a sealing element.

4. Gradient coil unit according to claim 1 or 2, wherein the first connection comprises a quick connection.

5. Gradient coil unit according to claim 1 or 2, wherein the connection unit is reversibly detachably configured.

6. Gradient coil unit according to claim 1 or 2, wherein the connection unit has at least two connection points.

7. Gradient coil unit according to claim 1 or 2, wherein the connection unit comprises a screw connection.

8. Gradient coil unit according to claim 1, wherein the lead-in unit has a distributor unit with at least two outlets and one main inlet, wherein each of the at least two outlets engages in each of at least two second ends when the connection unit is closed.

9. Gradient coil unit according to claim 8, wherein the at least two outlets and the main inlet form a common cavity, which is flowable by a cooling medium.

10. Gradient coil unit according to any one of claims 8 to 9, wherein the connection unit comprises a sealing element.

11. Gradient coil unit according to any one of claims 8 to 9, the gradient coil unit additionally comprises a lead-in hose, which is reversibly engageable in the main inlet.

12. Gradient coil unit according to any one of claims 8 to 9, wherein the gradient coil unit is designed such that a cooling medium flowing in through the main inlet is conducted such that a first cooling circuit of the at least two cooling circuits is supplied with the cooling medium via a first passage of the at least two passages and a second cooling circuit of the at least two cooling circuits is supplied with the cooling medium via a second passage of the at least two passages.

13. The gradient coil unit of claim 12, wherein the cooling medium is able to be conducted from the at least two cooling circuits via the interface unit and the lead-in unit when the flow direction of the cooling medium is reversed.

14. The gradient coil unit of claim 1 or 2, wherein the interface unit and / or the lead-in unit comprises an electrically insulating material.

15. The gradient coil unit of claim 1, wherein the first connection is a connector.

16. The gradient coil unit of claim 1, wherein the lead-in unit is connectable with the second end of the interface unit via the connection unit such that it is possible for cooling medium to flow from the lead-in unit into the at least two cooling circuits via the at least two passages of the interface unit.

17. The gradient coil unit of claim 4, wherein the first connection comprises a push-on connection barrel.

18. The gradient coil unit of claim 10, wherein the sealing element is arranged between the one outlet and the one second end in the closed state of the connection unit.

19. The gradient coil unit of claim 12, wherein the interface unit and the lead-in unit are designed such that a cooling medium flowing in through the main inlet is conducted such that a first cooling circuit of the at least two cooling circuits is supplied with the cooling medium via a first passage of the at least two passages and a second cooling circuit of the at least two cooling circuits is supplied with the cooling medium via a second passage of the at least two passages.

20. The gradient coil unit of claim 14, wherein the interface unit and / or the lead-in unit comprises plastic and / or ceramic.

21. A magnetic resonance device comprising a main magnet, a radio frequency antenna unit, a cooling medium reservoir and a gradient coil unit according to any one of claims 1 to 20 connected with the cooling medium reservoir.

Images