CN214473882U - Electrical connection line and magnetic resonance tomography apparatus - Google Patents

Abstract

The utility model relates to an electric connecting line, it is used for connecting the sensor on magnetic resonance tomography scanner, electric connecting line includes cable, sheath current barrier and protection hose, and wherein the protection hose surrounds other subassemblies in the periphery along electric connecting line's longitudinal direction zero clearance ground. The surface of the protective hose is characterized by a biocompatible, chemically resistant surface, which is also macroscopically smooth. Furthermore, the utility model relates to a magnetic resonance tomography scanner.

Description

Electrical connection line and magnetic resonance tomography apparatus

Technical Field

The utility model relates to an electric connection line, it is used for the sensor on magnetic resonance tomography scanner, electric connection line comprises a plurality of subassemblies, and wherein the subassembly includes cable, sheath current barrier (mantelwelllensperre) and protection hose, and wherein the protection hose encircles other subassemblies around the outer ring along electric connection line's longitudinal direction.

Background

A magnetic resonance tomography scanner is an imaging device which, for the purpose of imaging an examination subject, orients the nuclear spins of the examination subject with a strong external magnetic field and is excited by an alternating magnetic field to precess around the orientation. The precession of the spins, or the return from the excited state to a state with lower energy, in turn generates an alternating magnetic field in response, also referred to as a magnetic resonance signal, which is received via an antenna.

By means of the magnetic gradient fields, a position coding is applied to the signals, which position coding can then be realized to associate the received signals with the volume elements. The received signals are then evaluated and a three-dimensional imaging representation of the object under examination is provided.

To excite spin precession, an alternating magnetic field with a frequency corresponding to the larmor frequency at the corresponding static magnetic field strength and a very high field strength or power are required. In order to improve the signal-to-noise ratio of the magnetic resonance signals received by the antennas, antennas known as local coils are often used, which are arranged directly at the patient.

For imaging, the magnetic resonance signals received by the local coils must be transmitted to a receiving device of the magnetic resonance tomography scanner.

For the transmission of signals, coaxial cables or coaxial cable bundles are usually used, on which standing waves are formed which are dependent on the field strength of the magnetic resonance tomography scanner due to the alternating magnetic field which is excited. In order to suppress standing waves, so-called sheath current barriers are arranged at certain intervals along the cable. In magnetic resonance applications, there are two conventional implementations of sheath current barriers. In a first embodiment, the sheath current barrier is pushed onto the cable straight and on the outer circumference. The best results are achieved here when the sheath current barrier has as large a diameter as possible and surrounds the cable as long as possible. The described embodiments have inefficient space utilization due to the straight line guiding of the cable along the sheath current barrier. In a second embodiment, the cable is helically wound around the winding body. The thinner the cable, the more compact the coil can be constructed. The second embodiment is shielded over by a copper plated cylinder.

The sheath current barrier is usually surrounded by two identical half-shells which are connected to one another by means of four screws or via locking elements located on the outside. These locking elements are formed by locking springs which engage into matching recesses on opposite sides of the housing, so that a form-fitting connection is achieved. In order to connect a plurality of sheath current barrier housings to each other, a flange connection device is generally used. These flange connections are located at the end of a so-called protective sleeve which surrounds the cable in the longitudinal direction, thereby ensuring protection against patient contact. The cable flange is usually inserted into the housing of the sheath current barrier in a form-fitting manner and is connected to the housing when the housing assembly is closed. This conventional construction of the sheath current barrier housing is problematic because the use of screw connections and aluminum bushings requires structural space, which prevents a compact arrangement and flexible placement of the local coil on the patient. In addition, the holes for the thread of the screws leave gaps on the surface of the sheathing current barrier housing, which gaps can only be cleaned at great expense. The same applies to the locking element which is arranged on the outer surface of the sheath current barrier housing so as to constitute a structure protruding from the surface contour of the sheath current barrier housing. The necessity of covering screws and other gaps on the surface of the electrical connection lines increases production and installation costs and thus also costs.

The cables of the electrical connection lines are fixed in the sheath current barrier. The cable must be protected from forces in the longitudinal direction of the electrical connection line in order to avoid being pulled out. In order to ensure this, a stress relief device is required which absorbs forces in the longitudinal direction of the electrical connection line and introduces them into the housing of the sheath current barrier. The strain relief means may for example be integrated in the cable flange.

The manufacture of conventional embodiments of electrical connections is cost-intensive due to the interdigitation of the different components and their specific requirements. In the event of a failure or damage to the protective sleeve, the entire electrical connection line must usually be replaced, since the protective sleeve is firmly connected to the sheath current barrier housing and can only be separated from said sheath current barrier housing with relatively high effort. In conventional embodiments, the described configuration of the interleaved components also results in a large number of gaps on the housing of the sheath current barrier, in which dirt and cleaning liquids can accumulate or penetrate into the electronic device.

SUMMERY OF THE UTILITY MODEL

Starting from the above problem, the present invention is based on the object of providing an electrical connection line and a magnetic resonance tomography scanner for a sensor according to the present invention, which are easier to operate and which are less costly.

This object is achieved by an electrical connection circuit and a magnetic resonance tomography scanner according to the present invention.

The electrical connection according to the invention is a shielded connection for connecting a sensor, for example a local coil, a magnetic field sensor or a heart rate sensor, to a magnetic resonance tomography scanner. The electrical connection line has a cable with an electrical signal conductor and a shielding device. In a preferred embodiment, the sensor is designed as a local coil and the cable as a coaxial cable, wherein a plurality of electrical signal conductors can also be combined into a bundle.

According to the utility model discloses an electrical connection circuit still has the sheath current barrier for restrain the standing wave on the cable. The sheath current barrier preferably has a housing made up of a plurality of parts, which forms a closed casing around the sheath current barrier and the cable. For this purpose, the sheath current barrier housing has an opening for threading a cable. The parts of the sheath current barrier housing are held together in a defined relative position with respect to each other by so-called latching elements. Preferably, the openings for the lead-through cables are provided at the ends of the sheath current barrier housing which are opposite in the direction of extent of the electrical connection lines.

Furthermore, the electrical connection line according to the invention has a protective hose which is composed of a biocompatible, chemically resistant material and surrounds the other components of the electrical connection line in the longitudinal direction around the outer circumference. Biocompatible materials are characterized in that they have no undesirable side effects on living examination objects. This means that biocompatible materials in particular have a high cellular and blood compatibility and are not feared in terms of histopathology. Since biocompatible materials are often used in clinical settings and are in active contact with patients, the materials must also be resistant to the effects of sterilization, cleaning and disinfection methods. Examples of suitable biocompatible materials are plastics such as silicones, polyesters and polyamides. The protective hose has a macroscopically smooth surface and is designed such that gaps on the surface of the electrical connection lines are avoided. Macroscopically smooth surfaces are characterized by an outer contour that avoids protruding or recessed structures along the contour, such as seams and fastening structures.

According to the utility model discloses an electric connection line reduces the cost that is used for producing sheath current barrier casing and protective sheath, sheath current barrier casing and protective sheath are consumedly in making because its multiple functions, as for example in daily clinical, to patient's contact protection, to the stress relief of cable and biocompatibility and to the requirement of the resistant of structure of electric connection line.

The functions listed are combined in one assembly by the protective hose. All other components of the electrical connection line can thus be selected, for example, from an economic or technical point of view, whereby the construction thereof can be simplified and costs can be reduced. One advantage results in particular from the gapless encapsulation of the electrical connection: in the gap between the protective sheath of a conventional electrical connection line and the sheath current barrier housing, pathogens can accumulate, which are the risk of infection for the patient. Furthermore, cleaning liquids may penetrate into the electronic device via these gaps and impair the functionality of the electrical connection lines and the safety of the patient. By enclosing the electrical connection lines without gaps with a protective hose, this risk can be eliminated. In addition, the protective hose can be detached from the electrical connection line with little effort in the scope of repair and maintenance work, wherein detachment of components of the electrical connection line is avoided.

Further advantageous embodiments are given in the following description.

In one possible embodiment of the electrical connection line, the cable of the electrical connection line has a protective sleeve which surrounds the cable in the longitudinal direction around the outer circumference. It is conceivable for the protective sheath to surround the cable only in the sections between the sheath current barriers. However, the protective sleeve can also be designed to surround the sheath current barrier or sheath current barrier housing in the longitudinal direction around the outer circumference. In this embodiment, the protective sleeve is preferably made of an elastically deformable material, which is flexible so that it does not interfere with the placement of the sensor at the patient. In this embodiment, the protective sleeve is surrounded by the protective hose in the longitudinal direction of the electrical connection line on the outer circumference. The protective sheath here forms a spacing of a few millimeters or less between the protective hose and other components of the electrical connection, such as, for example, sheath current barrier housings, sheath current barriers or cables. Thereby, transitions between different materials of the components of the electrical connection line are compensated and the possible movement margin of the individual components is reduced.

The described embodiments improve the tactile properties of the electrical connection and reduce the noise caused by the play of the assembly surrounded by the protective tube. This enables a comfortable therapeutic experience for the patient, which is important in the context of many patients experiencing discomfort in magnetic resonance tomography examinations.

In a related embodiment of the electrical connection line, the protective sheath is additionally an electrical insulator. This means that the protective sheath does not conduct current, thereby protecting the patient from the voltage on the electrical signal conductors of the cable.

With the described embodiments, contact protection against voltage is provided by the protective sheath. Thus, no contact protection is required for the other components of the electrical connection lines, and these components can be manufactured at lower cost.

In another related embodiment, the protective hose is an electrical insulator and provides contact protection for the patient with respect to the voltage on the electrical signal conductor.

In this embodiment, the contact protection for the patient is ensured by a protective hose. The further components of the electrical connection can thus be produced more easily and more cost-effectively.

In a possible embodiment of the electrical connection line according to the invention, the protective hose has an elastically deformable inner lining which is connected in a material-fitting manner to the protective hose. The liner has a wall thickness of several millimeters. The wall thickness is advantageously less than 5mm, and most advantageously less than 4 mm. A wall thickness of 3mm or less is particularly desirable. The inner lining forms a spacing with components of the electrical connection, such as sheath current barriers, sheath current barrier housings or cables. The deformation properties of the lining are preferably selected such that the lining does not interfere with the placement of the sensor at the patient. The lining is designed to compensate for transitions between different materials of the components of the electrical connection line and to reduce the possible range of movement of the individual components.

In this embodiment, the protective tube is designed to combine the function of reducing the movement margin of the components of the electrical connection line and the above-mentioned tactile requirements with the advantages of a surface that is free of play and macroscopically smooth. The construction of the other components can thereby be simplified and the production costs can be reduced.

In a preferred embodiment of the electrical connection line, the protective hose has an elastically deformable inner lining which is connected to the protective hose material in a form-fitting manner. In addition, one of the two layers of the protective hose is an electrical insulator and ensures contact protection for the patient.

The described embodiment is particularly advantageous because, in addition to the examples detailed above, it also combines the requirements for contact protection in the outer component of the protection hose. The requirements for enclosed components of the electrical connection lines are thereby further reduced and these components can be produced more inexpensively.

In a related embodiment, the sheath current barrier housing is connected to a tensile strand which absorbs forces in the longitudinal direction of the electrical connection line and guides said tensile strand into the sheath current barrier housing. Examples of such ropes are cut lengths of monofilament and multifilament (Zuschnitte) made of natural materials or plastics, such as hemp or aramid. In this embodiment, the tensile strand is arranged on a carrier formed for this purpose on the sheath current barrier casing. It is conceivable that the tensile strand is guided in the longitudinal direction around the outer circumference of the protective sleeve or within a recess running in the longitudinal direction of the protective sleeve. It is also conceivable that the tensile cords and/or the protective sheaths, including the cables and the sheath current barrier shells, are circumferentially surrounded in the longitudinal direction by protective hoses.

This embodiment is advantageous because the fixing of the tensile strands to the sheath current barrier shell is a particularly simple and cost-effective embodiment of the stress relief means.

In a further possible embodiment of the electrical connection line, the protective hose has a tensile material which absorbs forces in the longitudinal direction of the electrical connection line and thus provides stress relief for the cable. Examples of suitable tensile materials are fibers based on different plastics (e.g. polyaramids, polyamides), ceramics (e.g. alumina, silicon carbide) and natural materials (e.g. hemp, flax). It is conceivable that the effect of the tensile component of the protective hose extends in particular in the longitudinal direction of the electrical connection line. Thereby, a certain amount of stretchability in the transverse direction of the protective hose may still be maintained to adapt the protective hose to different cross-sections between the sheath current barrier housing and the cable. It is also conceivable for the protective hose to introduce forces into the sheath current barrier housing in the longitudinal direction of the electrical connection lines, for example by means of rough or adhesive surface properties. In addition, the inner cross section of the protective hose can also be greater than or equal to the maximum cross section of the component surrounded by the protective hose. In this case, the protective hose is fastened to a component located at the beginning and/or end of the electrical connection, for example a sensor, a sheath current barrier housing or a plug, so that only the section surrounded by the protective hose is subjected to stress relief.

In this embodiment, the protection hose absorbs forces in the longitudinal direction of the electrical connection line, thereby ensuring stress relief to the cable. Thereby, there is no need for tensile cords and brackets for tensile means on the sheath current barrier shell, and this can be manufactured more easily and at lower cost.

In a further embodiment of the electrical connection line, the protective tube is made of a particularly stretchable material and has a free inner cross section which is smaller than the maximum cross section of the component of the electrical connection line. The component with the largest cross section may be, for example, a sheath current barrier housing, but may also be a transition piece on a plug connector from the cable to the sensor or to the connection line. At a position along the electrical connection line at which the inner cross section of the protective sleeve is smaller than the cross section of the component, the protective sleeve stretches by a difference and exerts a force directed radially in the direction of the surface of the component. The force secures the protective hose along the electrical connection line and prevents undesired relative movements between the protective hose and the electrical connection line.

In this embodiment, the protective hose is particularly stretchable, so that the electrical connection lines can be advantageously positioned at the time of inspection. In addition, the elastic tensile forces of the protective hose act radially on the surface of the surrounding component, so that further devices for fastening the protective hose to the component of the electrical connection are avoided. The production costs of the electrical connection lines can thereby be reduced.

In a related embodiment of the electrical connection line, the protective hose is made of a thermoplastic material that shrinks under heat so as to match the cross section of the components of the electrical connection line. Preferred materials are thermoplastic elastomers or shrink-tubing which can also be elastically deformed in the shrunk state. The protective tube is permanently fixed to the electrical connection line in the desired position by a form fit between the protective tube and the components of the electrical connection line after the shrinking process.

In this embodiment, a particularly simple installation of the protective hose on the electrical connection line is possible. Commercially available shrink hoses also have high shrinkage rates of up to 10:1, so that a good fit to all cross sections of the components along the electrical connection lines can be achieved.

In a further embodiment of the electrical connection line, the protective tube has an element that is identical to the cuboid and that surrounds the components of the electrical connection line in a cylindrical manner in the longitudinal direction around the outer circumference in a rolled-up manner, and the opposing edges of the element overlap or partially overlap when surrounding the electrical connection line. The protective hose has a connection contour in the longitudinal direction of the electrical connection lines, which is designed, for example, as a seam, as a velcro connection or as an adhesive connection. The connection contour is preferably designed such that it seals the assembly surrounded by the protective hose against liquids from the environment of the protective hose.

This embodiment of the electrical connection line is advantageous because the assembly of the protective hose is particularly time-saving and simple. In this embodiment, a simple replacement of the hose is also possible, since the protective hose can be easily opened along the connecting contour.

In a further embodiment of the electrical connection, the protective tube has a machine-readable identifier which encodes information about the sensor to be connected or the magnetic resonance tomography scanner used. This information may include, for example, the magnetic field strength or the electrical signal conductors of the magnetic resonance tomography scanner and the required cross section of the sheath current barrier used.

The embodiment is advantageous because the fitter can assign the protective tube to the magnetic resonance tomography scanner more easily, which reduces the time expenditure for installing and maintaining and replacing the electrical connection lines or parts of the electrical connection lines. It is also conceivable that the identification is machine-detectable, so that, for example, a faulty connection can be automatically detected by the control device and interrupted.

Drawings

Other features, characteristics and advantages of the present invention will be derived from the following description with reference to the accompanying drawings. In which is schematically shown:

figure 1 shows a magnetic resonance tomography scanner according to the invention;

fig. 2 shows an electrical connection line according to the invention;

fig. 3 shows a cross-sectional view of an electrical connection line according to the invention;

FIG. 4 illustrates a stress relief device constructed by connecting a sheath current barrier shell with a tensile cord in accordance with the present invention;

fig. 5 shows a cross-sectional view of a protective sheath of an electrical connection line according to the invention;

fig. 6 illustrates a strain relief device according to the present invention positioned between the sheath current barrier housing and the latching element and applying a force acting radially on the cable;

fig. 7 shows a protective hose according to the invention, which surrounds the sheath current barrier housing at the outer circumference;

fig. 8 shows a cross-sectional view of a protective hose according to the invention, which surrounds the sheath current barrier housing at the outer circumference;

figure 9 shows a protective hose according to the invention with elements that are cogged with a cuboid;

fig. 10 shows a sectional view of a protective hose according to the invention, which has elements that are congruent with the cuboid and which surrounds the electrical connection lines.

Detailed Description

A magnetic resonance tomography scanner 10 is schematically shown in fig. 1. The magnetic resonance tomography scanner 10 comprises a magnet unit 11 with a superconducting main magnet 12 for generating a strong and in particular homogeneous main magnetic field 13. In addition, the magnetic resonance tomography scanner 10 comprises a patient accommodation region 14 for accommodating a patient 15. In the present exemplary embodiment, the patient receiving region 14 is of cylindrical design and is surrounded in the circumferential direction by the magnet unit 11. In principle, however, different configurations of the patient receiving region 14 can be considered at any time. A patient 15 can be positioned in the patient receiving region 14 by means of a patient support 16 of the magnetic resonance tomography scanner 10. For this purpose, the patient support 16 has a table 17 which is movable within the patient receiving region 14.

The magnet unit 11 also has a gradient coil unit 18 for generating magnetic field gradients for position encoding during imaging. The gradient coil unit 18 is actuated by means of a gradient control unit 19 of the magnetic resonance tomography scanner 10. The magnet unit 11 also comprises a radio-frequency antenna unit 20, which in the present exemplary embodiment is designed as a body coil that is fixedly integrated into the magnetic resonance tomography apparatus 10. The high-frequency antenna unit 20 is designed for exciting the nuclei which are present in the main magnetic field 13 generated by the main magnet 12. The high-frequency antenna unit 20 is operated by a high-frequency antenna control unit 21 of the magnetic resonance tomography scanner 10 and emits high-frequency magnetic resonance pulses into an examination space, which is essentially formed by the patient receiving region 14 of the magnetic resonance tomography scanner 10. The high-frequency antenna unit 20 is also designed to receive magnetic resonance signals.

For controlling the main magnet 12, the gradient control unit 19 and for controlling the high-frequency antenna control unit 21, the magnetic resonance tomography scanner 10 has a system control unit 22. The system control unit 22 centrally controls the magnetic resonance tomography scanner 10, for example, to execute a predetermined imaging gradient echo sequence. In addition, the system control unit 22 comprises an evaluation unit, not shown in detail, for evaluating the digitized magnetic resonance signals detected during the magnetic resonance examination. Furthermore, the magnetic resonance tomography scanner 10 comprises a user interface 23 connected to the system control unit 22. The control information, such as for example imaging parameters, and the reconstructed magnetic resonance image may be displayed for the medical staff on a display unit 24, for example on at least one monitor, i.e. a user interface 23. Furthermore, the user interface 23 has an input unit 25 by means of which information and/or parameters can be input by medical staff during the measuring process.

Furthermore, the magnetic resonance tomography apparatus 10 has a sensor, for example a local coil 26, which in this example is arranged in the chest region of the patient 15. The electrical connection 27 of the local coil 26 comprises at least one electrically conductive line configuration. As with the high-frequency antenna unit 20, the local coil 26 is designed for excitation of the nuclei and for reception of magnetic resonance signals and is operated by the high-frequency antenna control unit 21. For signal transmission, the local coil is connected to the system control unit 22 via the high-frequency antenna control unit 21 by means of an electrical connection 27.

Of course, the magnetic resonance tomography scanner 10 shown in the present embodiment may include other components that are typical of magnetic resonance tomography scanners. The general function of the magnetic resonance tomography scanner 10 is also known to the person skilled in the art, so that a detailed description of the general components is omitted.

In fig. 2, an electrical connection 27 for connecting the local coil 26 to the high-frequency antenna control unit 21 is shown. The electrical connection 27 is electrically connected to the high-frequency antenna control unit 21 via a plug connection 28. One or more sheath current barriers 29 are arranged on the electrical connection line 27, which sheath current barriers limit the occurrence of sheath currents. The sheath current barrier 29 is circumferentially surrounded by a sheath current barrier housing 30. Between the sheath current barriers 29, the cable 31 is surrounded by a so-called protective sheath 32. Contact protection is obtained over the entire extension of the electrical connection 27 up to the local coil 26 with respect to the patient 15 by using a sheath current barrier housing 30 and a protective sheath 32. The electrical connection 27 is surrounded in the longitudinal direction on the outer circumference by a protective hose 35. Due to the close contact with the patient 15 and the medical technician, the protective tube 35 must have a biocompatible, macroscopically smooth surface 33 which can be cleaned by means of measures customary in the clinical field and which provides protection against penetration of liquids. Since the sensor 26 is placed individually on the patient 15, the electrical connection 27 is designed flexibly and has good operability. The protective hose 35 and/or the protective sheath 32 compensate for possible cross-sectional differences of other components, such as the sheath current barrier 29, the sheath current barrier housing 30 and the cable 31.

Fig. 3 shows a longitudinal section of the electrical connection line 27 from fig. 2 along a section plane III of the electrical connection line 27. The cable 31 is surrounded on the outer circumference by a protective sheath 32 and a protective hose 35.

Fig. 4 shows a longitudinal section through an embodiment of the electrical connection line 27, wherein the sheath current barrier housings 30 are connected to each other by a tensile strand 34. On the sheath current barrier housing 30 there is a bracket to which a tensile strand 34 is fixed. In the embodiment shown, the ends of the tensile strands 34 are configured, for example, as knots that hang in recesses in the sheath current barrier shell 30. By means of this embodiment, forces are introduced into the sheath current barrier housing 30 in the longitudinal direction 38 of the electrical connection line 27. Thereby protecting the transition between the cable 31 and the sheath current barrier 29 from tensile forces. In the embodiment shown, the sheath current barrier housing 30, the tensile cord 34, the protective sheath 32 and the cable 31 are surrounded by a protective hose 35 in the longitudinal direction 38 of the electrical connection line 27. In contrast to the possible embodiment in which the tensile strand 34 is embedded in the integral foam of the protective sheath 32 in a complex manner, the tensile strand can be guided in a corresponding recess along the protective sheath 32 in the illustrated exemplary embodiment. The encircling protective hose 35 prevents the protective sheath 32 and the tensile cord 34 from separating when the electrical connection line 27 is bent in the case of a placement of the sensor 26 at the patient 15. The support of the protective sleeve 32 and the tensile cord 34 on the sheath current barrier casing can be constructed as simply as possible, since the protective hose 35 covers gaps and seams on the surface of these components.

Fig. 5 shows a cross section of the electrical connection line 27 of fig. 4. The tensile strand 34 is guided along a recess in the protective sheath 32 in the longitudinal direction of the electrical connection line 27.

Fig. 6 shows a preferred embodiment of the electrical connection 27, wherein the strain relief of the cable 31 is carried out via a strain relief device 40 positioned between the latching element 36 and the sheath current barrier housing 30. The strain relief device 40 has an opening for the cable 31 to be threaded through and surrounds the cable at least partially around the outer circumference on a section delimited in the longitudinal direction. The shape of the stress relief means 40 corresponds, for example, to the shape of truncated cones, which each have a conical side surface and a flat bottom surface. These faces are closed with the complementary faces of the blocking element 36 and the sheath current barrier housing 30, respectively. Sheath current barrier housing 30 has external threads for securing blocking element 36. When the two are joined, pressure is exerted on the tapered side surfaces and the bottom surface of the truncated cone. By means of said pressure, the strain relief device 40 is deformed and exerts a force 42 radially aligning the cable 31. In contrast to the embodiment according to fig. 3, only the transition region of the cable 31 to the sheath current barrier 29 is stress-relieved by a force in the longitudinal direction 38 of the electrical connection line 27. In this example, the protective hose 35 has a firmly connected and elastically deformable inner liner 37. The inner liner 37 is, for example, a foam material which is matched to the cross section of the components of the electrical connection line 27, such as, for example, the sheath current barrier housing 30 and the cable 31. The blocking element 36, close to the opening 41 for the cable 31, preferably has a sealing lip 43 which presses onto the cable 31 at the outer circumference and seals off the interior 39 of the sheath current barrier housing 30 in a sealing manner from the upstream section of the cable 31. The seal prevents liquid from possibly penetrating into sheath current barrier housing 30 in the event of damage to protective hose 35. The sealing lip 43 can be designed in any desired manner, for example as a circumferential edge or bead. In addition to the embodiment shown, variants are also conceivable in which instead of the inner liner 37 a protective sheath 32 is used which is not permanently connected to the protective hose 35.

Fig. 7 shows a possible embodiment of an electrical connection line 27 according to the invention, in which a protective hose 35 surrounds the protective sheath 32 and the sheath current barrier housing 30 with the blocking element 36 on the outer circumference.

Fig. 8 shows a longitudinal section through the protective hose 35 along the section plane VIII of the embodiment in fig. 7. The sheath current barrier housing 30 is in this example composed of two half-shells and is held together at the ends closed in the longitudinal direction by means of a blocking element 36. In the embodiment shown, a cavity 47 can be formed, in which the protective tube 35 does not rest against the surface of the surrounding component. Such a cavity 47 can be compensated for, for example, by the elastically deformable inner lining 37 or the elastically deformable protective sleeve 32 of the protective hose 35. The protective sheath 32 may also have a protective sheath flange that is form-fittingly inserted into the sheath current barrier housing 30. The sheath current barrier housing 30 is preferably designed in two parts for this purpose and has an internal or external latching element, wherein the latching element is designed, for example, as a locking spring or locking sleeve which engages into a complementary fastening system on the opposite part of the sheath current barrier housing 30 and closes it. It is also contemplated that the protective jacket has a tensile strand 34 that is flanged to the jacket and provides strain relief for the cable 31.

Fig. 9 shows a protective tube 35 which has elements that are identical to the cuboid. The opposing longitudinal edges of the elements have simple complementary recesses which, when the elements are joined together, form a connection which is as free as possible from play and a macroscopically smooth surface. The recess can have, for example, an adhesive or a velcro in order to prevent the protective hose 35 from unintentionally opening along the connecting contour 46 of the two longitudinal edges.

Fig. 10 shows a cross section through an electrical connection line 27 with a protective hose 35 according to the embodiment in fig. 9. The protective hose 35 is laid around the other components of the electrical connection 27, such as for example the cable 31, the protective sheath 32 and the sheath current barrier housing 30 and is closed along the connection contour 46. The protective hose 35 can be made of a stretchable material, for example, which is adapted to the different cross-sections of the components. Alternatively, the protective tube 35 can also be made of a tensile material, in which different cross sections of the component are taken into account due to a preformed curvature in the material. When using a tensile material, it is conceivable to facilitate stress relief of the cable 31 by the protective hose 35 or to completely relieve stress of the cable 31 by the protective hose 35.

Although the details of the invention have been shown and described in detail with reference to preferred embodiments, the invention is not limited by the examples disclosed and other variants can be derived therefrom by the person skilled in the art without departing from the scope of the invention.

Claims (13)

1. An electrical connection line (27) for connecting a sensor to a magnetic resonance tomography scanner (10), wherein the electrical connection line (27) has the following components:

a cable (31) with electrical signal conductors, a sheath current barrier (29) and a protective hose,

it is characterized in that the preparation method is characterized in that,

the outer surface of the electrical connection line is formed without a gap in the following manner: the protective hose extends in the longitudinal direction around the outer circumference around the other components of the electrical connection line,

wherein the protective hose is made of a biocompatible, chemically resistant material and has a macroscopically smooth surface.

2. Electrical connection line (27) according to claim 1,

wherein the cable has an elastic protective sheath which surrounds the cable in the longitudinal direction around the outer circumference and which is designed to provide a spacing between the electrical connection line and the protective hose, wherein the protective sheath is surrounded by the protective hose in the outer circumference in a manner extending in the longitudinal direction of the electrical connection line.

3. The electrical connection circuit (27) of claim 2,

wherein the protective sheath is an electrical insulator.

4. The electrical connection circuit (27) of claim 2,

wherein the protective hose is an electrical insulator.

5. Electrical connection line (27) according to claim 1,

wherein the protective hose has an elastically deformable inner lining which is connected to the protective hose in a material-fitting manner and is designed to provide a distance between the electrical connection line (27) and the protective hose.

6. Electrical connection line (27) according to claim 5,

wherein the protective hose is an electrical insulator.

7. The electrical connection circuit (27) according to any one of claims 1 to 6,

wherein the sheath current barrier (29) has a sheath current barrier housing (30) with a holder configured to accommodate a stress relief device, wherein the stress relief device introduces a force into the sheath current barrier housing (30) in a longitudinal direction of the electrical connection line, thereby providing stress relief for the cable.

8. The electrical connection circuit (27) according to any one of claims 1 to 6,

wherein the protection hose comprises a material that is tensile in the longitudinal direction of the electrical connection line, the material being capable of absorbing forces in the longitudinal direction of the electrical connection line.

9. The electrical connection circuit (27) according to any one of claims 1 to 6,

wherein the protective hose is made of a stretchable material and has a free inner cross-section which is smaller than the maximum outer diameter of the assembly of electrical connection lines (27).

10. The electrical connection circuit (27) according to any one of claims 1 to 6,

wherein the protective hose is composed of a thermoplastic material which shrinks under heat and thereby matches the cross section of the components of the electrical connection.

11. The electrical connection circuit (27) according to any one of claims 1 to 6,

wherein the protective tube has an element that is identical to the cuboid, wherein the element that is identical to the cuboid is rolled into a tube and has a connection contour that is sealed closed in the longitudinal direction of the electrical connection.

12. The electrical connection circuit (27) according to any one of claims 1 to 6,

wherein the protective hose has a machine-readable identifier which encodes information about the technical specification of the magnetic resonance tomography scanner (10).

13. A magnetic resonance tomography scanner (10),

wherein the magnetic resonance tomography scanner (10) has a sensor, wherein the sensor is in signal connection with the magnetic resonance tomography scanner (10) by means of an electrical connection line (27) according to one of claims 1 to 12.

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