CLAMP

Description

background

[0001] In many areas of medical technology, clamps are used to switch the flow through a fluid-carrying channel, such as a hose or a channel embedded in a cassette, which is limited by a flexible wall.

[0002] For example, devices for monitoring and regulating fluid flow are known from US patent application US 2014 / 318639 A1 and EP 1 132 108 A1. The device also features a safety valve with a mechanically sophisticated design.

[0003] These switchable terminals comprise a clamping element, a spring element, and a current-controlled holding element. The spring element provides a closing force to lock the terminal when the holding element is de-energized. In this state, the clamping element seals off the fluid-carrying channel in a closed position, thus preventing fluid flow.

[0004] In this case, "fluid" can be either a liquid or a gas.

[0005] In particular, the locking position in a power-off state is advantageous, as it should prevent, for example, any further (uncontrolled) supply of substances to a human or animal body in the event of a power failure.

[0006] The holding element, e.g., an electromagnet, is energized when the terminals are in the open position. The holding element thus provides a holding force that counteracts the spring force and keeps the clamping element in the open position.

[0007] A disadvantage of this arrangement is that, due to the linear force-displacement relationship, the holding force must generally be higher than the closing force provided by the spring element, see Figure 6 .

[0008] Furthermore, a higher closing force requires a correspondingly higher holding force.

[0009] A higher closing force requires a larger and therefore heavier spring element, and consequently also a heavier electromagnet, higher holding currents, and higher energy consumption.

[0010] This increases both the production costs and the operating costs. Task

[0011] It is therefore an object of the invention to provide a terminal that is more cost-effective to manufacture and has lower operating costs. It is a further object of the invention to provide terminals whose operation requires significantly less electrical energy compared to known terminals. Brief description of the invention

[0012] The problem is solved by a clamp which is designed such that the clamp can accommodate a fluid-carrying channel, that the clamp can compress the fluid-carrying channel in a rest state, and that the clamp can accommodate the fluid-carrying channel in a working state in such a way that the fluid-carrying channel is not compressed, wherein the clamp has a first permanent magnet and a second permanent magnet, wherein the permanent magnets are arranged at a distance from each other such that the permanent magnets are rotatable relative to each other by at least one angle, wherein the relative rotation of the permanent magnets relative to each other leads to a reduction of the distance, wherein the rest state is provided at a first angle and the working state at a second angle.

[0013] In particular, the permanent magnets can be arranged to be movable relative to each other, wherein the permanent magnets are rotatable relative to each other by at least an angle and wherein the permanent magnets are linearly movable relative to each other so that the distance between the permanent magnets can vary, wherein a rotation of the permanent magnets relative to each other leads to a change in the relative arrangement of the poles of the permanent magnets relative to each other, which in turn causes a change in the magnetic attraction forces between the magnets, resulting in a change in the distance between the permanent magnets, wherein the clamp assumes a rest state in a first relative rotation position of the permanent magnets relative to each other and a working state in a second relative rotation position of the permanent magnets relative to each other.

[0014] A fluid-carrying channel can be, for example, a hose or a channel embedded in a cassette, which is bounded by a flexible wall.

[0015] The invention makes it possible to provide a clamp that allows for a simple mechanical design while simultaneously reducing holding currents.

[0016] In one embodiment of the clamp (1) proposed herein, the clamp (1) blocks the flow in a rest state by compressing a fluid-carrying channel (L) and allows the flow in an operating state by releasing the compression. The clamp (1) comprises a first magnet (M1) and a second magnet (M2), wherein the magnets (M1, M2) are arranged at a distance from each other such that they are rotatable relative to each other by at least one angle, the relative rotation of the magnets (M1, M2) reducing the distance (d), with the rest state being provided at a first angle and the operating state at a second angle.

[0017] In one embodiment of the invention, the fluid is a liquid, i.e., the invention allows, for example, the controlled supply of dialysate or other substances.

[0018] In a further embodiment of the invention, a (recessed) fluid-carrying channel is arranged between the permanent magnets.

[0019] According to a further embodiment of the invention, the first permanent magnet and / or the second permanent magnet is a so-called polymagnetized magnet, wherein such a permanent magnet has a first number of sectors of a first magnetization and a second number of sectors of a second, opposite magnetization.

[0020] Using polymagnetized magnets, it is particularly easy to create elements that can be rotated and / or moved relative to each other in a small installation space.

[0021] In a further embodiment of the invention, the absolute difference between the first angle and the second angle is less than or equal to 360° divided by the number of sectors, i.e., the necessary forces can be applied even with a rotation of less than 180°.

[0022] In yet another embodiment of the invention, a lever is provided for opening the clamp, so that a fluid-carrying channel can be inserted into the clamp.

[0023] The lever allows the clamp to be opened even when the power is off, so that a fluid-carrying channel can be inserted.

[0024] According to a further embodiment of the invention, an electromagnet is further provided which, in the event of activation, acts on at least one of the permanent magnets in such a way that the operating state is maintained, i.e., the electromagnet is designed in such a way that the flow through the fluid-carrying channel is enabled.

[0025] According to a further development of the invention, in the event of activation, the electromagnet acts on at least one of the permanent magnets in such a way that the operating state is reached, i.e., the electromagnet is designed in such a way that it can be switched from the rest state to the operating state.

[0026] This embodiment is particularly suitable for clamps on channels through which medical fluids such as blood or infusion fluids are conveyed to or from a patient. The clamp can be part of, for example, a blood treatment machine, a peritoneal dialysis machine, or an infusion pump. In the event of a malfunction in such devices, especially an interruption of the device's power supply, a safe state must generally be established in which the fluid connection to the patient is interrupted. A holding element designed as an electromagnet, which switches from the resting state to the operating state by means of current activation, would inevitably switch from the operating state to the resting state in the event of a power failure and interrupt the flow through the channel.

[0027] According to a further development of the invention, the first permanent magnet is guided on a helical path relative to the second permanent magnet during the transition from the rest state to the working state.

[0028] This allows for the provision of different route profiles.

[0029] In another embodiment, a plunger-like shape provides the closing force, wherein the force characteristic of the magnet pair, formed from the first permanent magnet and the second permanent magnet, in which the attraction force is large when the permanent magnets are close together, is converted into a force characteristic of the closing force, which is large when the clamp is closed.

[0030] Further advantageous embodiments are the subject of the dependent claims and the detailed description. Brief description of the characters

[0031] The invention will now be explained in more detail with reference to the figures. These show: Fig. 1 an exemplary orientation of polymagnetized permanent magnets in a first state according to embodiments of the invention, Fig. 2 an exemplary orientation of polymagnetized permanent magnets in a second state according to embodiments of the invention, Fig. 3 an exemplary sectional view of elements of a clamp according to the invention in a first state, Fig. 4 an exemplary sectional view of elements of a clamp according to the invention in a second state, Fig. 5 an exemplary exploded view of elements of a clamp according to the invention, and Fig. 6 a force-displacement diagram of screw terminals from the prior art as well as according to embodiments of the invention. Detailed description

[0032] The invention will now be described in more detail with reference to the figures. It should be noted that different aspects are described, each of which can be used individually or in combination; that is, each aspect can be used with different embodiments of the invention, unless explicitly presented as a pure alternative.

[0033] Furthermore, for the sake of simplicity, reference will generally be made to only one entity at a time. Unless explicitly stated otherwise, the invention may also include several of the entities concerned. Therefore, the use of the words "a", "an", and "a" should only be understood as an indication that at least one entity is used in a simple embodiment.

[0034] According to the invention, a terminal 1 is provided.

[0035] In its resting state, terminal 1 blocks the flow by compressing an inserted fluid-carrying channel L. In its operating state, however, the flow through the inserted fluid-carrying channel L is enabled by releasing the compression.

[0036] That is, the terminal 1 can be designed such that the terminal 1 can accommodate a fluid-carrying channel L, wherein the terminal 1 can compress the accommodated fluid-carrying channel L in a rest state, and that the terminal 1 can accommodate a fluid-carrying channel in such a way that it is not compressed in a working state.

[0037] For this purpose, terminal 1 has a first magnet, i.e. a permanent magnet, M1 and a second magnet, i.e. a permanent magnet, M2, wherein the magnets M1, M2 are arranged at a distance from each other such that the magnets M1, M2 can be rotated relative to each other by at least an angle, wherein the relative rotation of the magnets M1, M2 relative to each other leads to a reduction of the distance d, wherein the rest state is provided in a first angle and the working state in a second angle.

[0038] In particular, in one embodiment the permanent magnets M1, M2 can also be arranged so that they are movable relative to each other such that they are rotatable relative to each other by at least an angle and that they are linearly movable relative to each other, so that the distance d between the permanent magnets M1, M2 can vary, wherein a rotation of the permanent magnets M1, M2 relative to each other leads to a change in the relative arrangement of the poles of the permanent magnets M1, M2 relative to each other, which in turn causes a change in the magnetic attraction forces between the permanent magnets M1, M2, resulting in a change in the distance d between the permanent magnets M1, M2, wherein the terminal 1 assumes a rest state in a first relative rotational position of the permanent magnets M1, M2 relative to each other and an operating state in a second relative rotational position of the permanent magnets M1, M2 relative to each other.

[0039] In other words, a clamp of this design is such that that it can accommodate a fluid-carrying channel, that it can compress a accommodated fluid-carrying channel (L) in a rest state, and that it can accommodate a fluid-carrying channel in a working state in such a way that it is not compressed, wherein the clamp (1) has a first permanent magnet (M1) and a second permanent magnet (M2), wherein the magnets M1, M2 are arranged to be movable relative to each other, such that the magnets (M1, M2) are rotatable relative to each other by at least an angle, and that the magnets (M1, M2) are linearly movable relative to each other, such that the distance between the magnets can vary, wherein a rotation of the magnets (M1, M2) relative to each other leads to a change in the relative arrangement of the poles of the magnets to each other, which in turn causes a change in the magnetic attraction forces between the magnets, as a result of which a change in the distance (d) of the magnets occurs.wherein the clamp assumes a rest state in a first relative rotational position of the magnets relative to each other and an operating state in a second relative rotational position of the magnets relative to each other.

[0040] A fluid-carrying channel L can be, for example, a hose or a channel embedded in a cassette, which is bounded by a flexible wall.

[0041] This will now be demonstrated using the Figures 1-5 These will be explained in more detail. An exemplary embodiment of the terminal 1 according to the invention is shown in these figures, although not all elements are visible or depicted.

[0042] In Figure 3 and Figure 4 Figure 1 shows a section view of a clamp 1 according to the invention. The corresponding exploded view is shown in Figure 2. Figure 5 shown. In the Figure 3 The image shows a version with polymagnetized permanent magnets.

[0043] Polymagnetized permanent magnets are available in various designs. These magnets feature an even number of sectors with different magnetizations (north / south). That is, next to a sector with a magnetic north pole (N) there is a sector with a magnetic south pole (S). Such polymagnetized magnets are available, for example, from Correlated Magnetics Research LLC, Huntsville, AL 35806 USA.

[0044] As is generally known, opposite magnetic poles attract each other, while like magnetic poles repel each other.

[0045] In the use of the invention, for example, two disc-shaped permanent magnets M1, M2 are installed, each disc having at least one south pole S and one north pole N. In the example of the Figures 1 and 2 The permanent magnets M1 and M2 each have two south poles and two north poles.

[0046] Is the permanent magnet M1 now as in Figure 1shown directly above the in Figure 1 When the permanent magnets M2 shown are arranged, their respective poles attract each other, and the permanent magnets M1, M2 tend to reduce their distance d.

[0047] However, if the permanent magnet M1 is used as in Figure 2 shown directly above the in Figure 2 When the permanent magnets M2 shown are arranged, their respective poles repel each other, and the permanent magnets M1 and M2 tend to increase their distance d.

[0048] If the permanent magnets M1 and M2 are positioned between these extremes of the Figure 1 and Figure 2 If the arrangement is such that either the repulsion effect or the attraction effect predominates, or at a certain point the effects cancel each other out with respect to the arrangement.

[0049] Although in the Figures 1-5 The invention is not limited to rotationally symmetric permanent magnets M1, M2 shown.

[0050] A forced path can now be prescribed through suitable support and guidance.

[0051] This involves Figure 3 A rest state is shown in which the distance becomes small due to the attraction of the permanent magnets M1, M2, and the inserted fluid-carrying channel L is compressed, thus preventing the flow.

[0052] In Figure 4 In contrast, the permanent magnets M1 and M2 are rotated relative to their resting state, and the distance d between them is increased by their guidance along a fixed path. Since the force between the two permanent magnets M1 and M2 decreases with increasing rotation towards the operating state, the force required to maintain this separation also decreases.

[0053] In the illustrated embodiment, for example, the permanent magnet M1 is held in a groove so that it can only perform a translational movement in the vertical direction. The permanent magnet M2 is also held in a groove N so that it can only perform a rotational movement, with the axis of rotation of the second permanent magnet M2 coinciding with the vertical direction of the translational movement of the first permanent magnet M1. This prescribes an exemplary constrained path.

[0054] The figures show an embodiment in which the spring element is provided by a pair of (preferably polymagnetized) permanent magnets. The permanent magnets M1 and M2 are mounted or guided such that one of the permanent magnets—here, permanent magnet M1—can move in the z-direction, and at least one of the permanent magnets—here, permanent magnet M2—can rotate. The mounting / guiding of the permanent magnets M1 and M2 does not permit any other movement components or paths. That is, in the illustrated embodiment, the first permanent magnet M1 can move in the z-direction but not rotate, and the second permanent magnet M2 can rotate but not move in the z-direction.

[0055] In an alternative embodiment, the first permanent magnet M1 is mounted / guided in such a way that it can perform a rotational movement and a movement in the z-direction. In this embodiment, the second permanent magnet M2 can be fixed in such a way that neither a rotational movement nor a movement in the z-direction is possible.

[0056] Both embodiments have in common that the movement of the permanent magnets M1, M2 relative to each other has both a z-component and a rotational component.

[0057] It should be noted that such a constraint path does not necessarily have to be "linear". Rather, the constraint path can have any suitable shape to provide holding forces.

[0058] In particular, the forced path can also be designed in such a way that not only working state and rest state are formed, but that one or more intermediate states are also made possible in order to realize an adjustable valve function.

[0059] Without limiting the generality, the fluid in the fluid-carrying channel L can be a liquid, such as dialysate, (arterial or venous) blood, or a gas.

[0060] The figures show an embodiment with a plunger-like projection. In this embodiment, the plunger-like projection S, which is vertically movable (with respect to the illustration), is actuated by the vertically movable magnet M1. The plunger-like projection S passes through an opening O in the second magnet M2. The plunger-like projection S can transmit the closing force, for example, to a clamping edge; that is, the mutual (attractive) forces of the first magnet M1 and the second magnet M2 are converted into a closing force. The closing force is no longer provided by a (fatigable) spring. The force characteristic of the magnet pair formed by the first magnet M1 and the second magnet M2, in which the attractive force is high to maximum at a small to minimal distance between the magnets, is converted into a force characteristic of the closing force, which is high to maximum when the clamp is closed.This effect is based on the transmission of the closing force via the plunger.

[0061] Although an arrangement has been described above in which the fluid-carrying channel L is not located between the magnets, but rather a plunger-like projection S is pressed by magnet M1 towards a stop, thereby compressing the fluid-carrying channel L inserted between them, this is not the only possible embodiment. The fluid-carrying channel can also be arranged between magnets M1 and M2. Furthermore, it should be noted that the assignment of the rest state and the operating state can also be chosen differently, such that the rest state releases the fluid-carrying channel L and the operating state interrupts the fluid flow in the fluid-carrying channel L. In other words, the invention is not limited to a specific form but can be used in any application.

[0062] In one embodiment of the invention, the first magnet M1 and / or the second magnet M2 is a polymagnetized magnet, wherein a polymagnetized magnet has a first number nN of sectors of a first magnetization N and a second number nS of sectors of a second magnetization S. Typically, the number of sectors is equal, i.e., n = nS = nN. In one embodiment, the magnetization pattern is imprinted using the polymagnetized magnet (www.polymagnet.com) method.

[0063] The angle range is generally usefully situated between the two extreme positions (analogous to Figure 1 and Figure 2 ) located. However, it can also be useful to make the area smaller. As a rule, the angular range of the rotation, i.e., the absolute difference of the first angle, is α Max and the second angle α Min is less than or equal to 360° divided by the number of sectors n, i.e. δ ≤ α Max − α Min n .

[0064] In the embodiment of the Figure 5 A lever H is also provided for mechanically opening terminal 1, so that a fluid-carrying channel L can be inserted into terminal 1. The lever H can, for example, be located on one of the magnets M1, M2, or their holder. In the example of the Figure 5 The lever H is integrally formed on the holder of the magnet M2 and moves in a groove N, i.e. the lever H also has the function of guiding it on the forced path.

[0065] Even when de-energized, the terminal can be opened and a fluid-carrying channel L can be inserted or removed.

[0066] An electromagnet can now be provided, which is arranged at a suitable location on or in terminal 1, which, in the event of activation, acts on at least one of the magnets M1, M2 in such a way that the operating state is maintained, i.e., the activated electromagnet counteracts the attractive force and keeps the fluid-carrying channel L open.

[0067] The electromagnet can easily be dimensioned so that, in the event of activation, it exerts sufficient force on at least one of the magnets M1 or M2 for the switching time required to open the terminal, thus achieving the operating state. Once the operating state is reached, the current through the electromagnet can be reduced, as less force is now required. For example, microswitches can be used to reduce the current when a terminal element reaches a specific position, and / or the current can be reduced after a certain time has elapsed. It is also possible to monitor whether a specific position has been reached after a certain time. If the position is not reached, a malfunction can be assumed, which could, for example, be signaled.

[0068] As previously described, the forced path can be designed in different ways. However, the simplest forced path is characterized by the fact that the relative path of the first magnet M1 with respect to the second magnet M2 during the transition from the rest state to the operating state can be mapped onto a helical path.

[0069] In the exemplary arrangement, the attractive force between the two magnets M1 and M2 provides a closing force for terminal 1. The imprinted magnetization pattern causes the remaining degree of freedom of movement between magnets M1 and M2 to acquire a helical component.

[0070] Magnet M1, which allows movement in the z-direction, is connected to the clamping element, which enables the fluid-carrying channel L to be clamped. Magnet M2, which allows rotational movement, can be connected to the holding element.

[0071] Both degrees of freedom of movement, in combination, result in a helical relative motion. Due to the helical nature of the relationship between the z-component of the clamping element's movement and the angular movement of magnet M2, or the holding element connected to it, the holding forces on the holding element in the open position are significantly lower than the clamping forces in the closed position.

[0072] Fig. 6Figure 1 shows the force-displacement diagram of a conventional clamp tensioned by a mechanical spring (solid line) and a clamp 1 according to embodiments of the invention (dashed line). At a displacement of s = 0 mm, the clamp 1 releases the fluid-carrying channel L. In the conventional clamp, a spring is held under tension in this position by a retaining element. When the retaining element releases the spring, the spring relaxes until the fluid-carrying channel is completely closed (here at s = 6 mm), with the residual tension of the spring ensuring sufficient closure in the closed position. In the embodiment with polymagnetized magnets M1, M2, a comparable closing force is achieved in the closed position, while a significantly smaller force is required from the retaining element to maintain the holding force in the open position.Since less force is now required to keep the fluid-carrying channel L open, the energy consumption of terminal 1 is also reduced compared to conventional terminals.

[0073] The fluid-carrying channel L can be inserted by manually opening the clamp 1 using a lever H connected to the holding element. In the open position, the holding element is held, for example, by an electromagnet. Due to the low holding forces, the electromagnet can be smaller and lighter, and require a lower holding current, resulting in lower energy consumption.

[0074] When the holding current is switched off, the two magnets follow an attractive movement towards each other along the helical path of movement and the clamping element goes into the closed position.

[0075] This embodiment is particularly suitable for terminals 1 for fluid-carrying channels L through which medical fluids such as blood or infusion fluids are conveyed to or from a patient. The terminal 1 can be part of, for example, a blood treatment machine, a peritoneal dialysis machine, or an infusion pump. Should a fault occur in such devices, especially an interruption of the electrical supply to the device or the terminal 1, a safe state must generally be established in which the fluid connection to the patient is interrupted. A holding element designed as an electromagnet, which switches from the standby state to the operating state by means of current activation, would inevitably switch from the operating state to the standby state in the event of a power failure, thereby interrupting the flow through the fluid-carrying channel L and achieving the safe state.

[0076] In further embodiments, a clamp 1 according to the invention has friction-reducing elements such as one or more sliding bushings O. Such a sliding bushing O could, for example, be arranged around a plunger-like projection S, e.g., around a pin or plunger S, which is guided through this bushing O, and whose movement is accompanied by a rotation of the two permanent magnets M1, M2 relative to each other and a change in the distance between the permanent magnets. Material pairings between the sliding bushing O and the plunger / pin / plunger S mounted therein are particularly advantageous if they exhibit the lowest possible static friction at rest, i.e., they do not exhibit a so-called stick-slip effect, and thus have the lowest possible breakaway torque. An example of such a material pairing is, for example, a plunger / pin / plunger S which is arranged in a sliding bushing O made of plastic.Particularly advantageous in this pairing are plastics with admixtures of PTFE, graphite, or boron nitride. Steels, especially stainless steels, are suitable. Furthermore, ceramics and silicon carbide are suitable materials for sliding bushings O. Such a sliding bushing O advantageously enables lower-friction movement of a plunger / pin / punch S mounted within it, which can be directly connected to a locking element / clamping element of the clamp 1. This results in significantly faster closing times, less wear, and a longer service life for such a clamp 1.

[0077] In a further embodiment, a clamp 1 according to the invention has, instead of a sliding bushing O, one or more sliding elements arranged around a movable part. It can be particularly advantageous not to arrange sliding elements around the entire circumference of, for example, a movable plunger / pin / punch S, but only in circular segments that cover less than 360 degrees. This allows for a particularly advantageous reduction in the required sliding element material by equipping segments of a circumference around a movable part capable of sliding therein with sliding elements.

[0078] The permanent magnets M1, M2 of terminal 1 are particularly advantageous when arranged in a housing made of a non-magnetic material such as aluminium or plastic.

[0079] The invention can be summarized as follows: A rotational movement of the pair of relative movable permanent magnets M1 and M2 triggers an additional linear movement – ​​e.g., perpendicular to the plane of rotation. Due to the magnetic coupling of the permanent magnets M1 and M2, this relative rotational movement results in a relative stroke movement; that is, the linear distance between the permanent magnets M1 and M2 changes as a result of the relative rotational movement.

[0080] This process is reversible. A relative rotational movement in a first direction leads to a decrease in the distance between the permanent magnets M1 and M2, and a relative rotational movement in a second (opposite) direction leads to an increase in the distance.

[0081] According to the invention, a rotary motion can be converted into an additional linear motion by designing, movably mounting, and arranging the permanent magnets M1 and M2 such that, in a first rotary position, the total attraction between the permanent magnets M1 and M2 is lower than in a second rotary position. This can be achieved, for example, by making the average distance between the attracting poles greater in the first rotary position than in the second. Alternatively, or additionally, this can be achieved by adjusting the number, shape, and design of the poles. Significantly less electrical energy is required for such a relative rotary motion and for maintaining a specific rotary position than was previously required for known clamps to hold a clamp in the open position.

Claims

1. A clamp (1), which is arranged such • that the clamp (1) can accommodate a fluid-carrying channel (L) in between a clamp element and a holding element, whereby the fluid-carrying channel (L) is arranged as a flexible line for medical fluids, • that the clamp (1) can compress the accommodated fluid-carrying channel in a resting state • and that in a working state the clamp (1) can accommodate the fluid-carrying channel (L) so that the fluid-carrying channel (L) is not compressed, • whereby the clamp (1) has a first permanent magnet (M1) and a second permanent magnet (M2), • whereby the permanent magnets (M1, M2) being arranged at a distance (d) from one another, such that the permanent magnets can be rotated at least about an angle relative to one another, the relative rotation of the permanent magnets (M1, M2) to one another resulting in a reduction in the distance (d), the resting state being made available at a first angle, and the working state being made available at a second angle • whereby a first of the permanent magnets (M1) is connected with the clamp element und whereby a second of the permanent magnets (M1) is connected with the holding element.

2. The clamp (1) according to claim 1, characterized in that the fluid is a liquid.

3. The clamp (1) according to claim 1 or 2, characterized in that the first permanent magnet (M1) and / or the second permanent magnet (M2) is a polymagnetized magnet, wherein a polymagnetized magnet has a first number of sectors of a first magnetization (N) and a second number of sectors of a second magnetization (S).

4. The clamp (1) according to claim 3, wherein the difference in amount between the first angle and the second angle is less than or equal to 360° divided by the number of sectors.

5. The clamp (1) according to one of the preceding claims, characterized in that a lever (H) is additionally provided for opening the clamp so that a fluid-carrying channel (L) can be inserted into the clamp, whereby the lever (H) is connected to the holding element.

6. The clamp (1) according to one of the preceding claims, characterized in that an electromagnet is additionally provided, acting on at least one of the permanent magnets (M1, M2) in the event of activation, so that the working state is maintained.

7. The clamp (1) according to claim 6, characterized in that the electromagnet acts on at least one of the permanent magnets in the event of activation, so that the working state is achieved.

8. The clamp (1) according to one of the preceding claims, characterized in that the first permanent magnet (M1) is guided on a helical path relative to the second permanent magnet (M2) in the transition from the resting state to the working state, whereby the second permanent magnet (M2) allows for a rotary motion and the first permanent magnet (M1) allows for a motion perpendicular to the rotary motion, whereby both degrees of freedom of the motions allow in combination a relative helical movement.

9. The clamp (1) according to one of the preceding claims, characterized in that a rod-type design (S) makes available the closing force of the clamp (1), wherein the force characteristic of the pair of magnets formed by the first permanent magnet (M1) and the second permanent magnet (M2), in which the attractive force is great when the distance between the magnets is small, is converted into a force characteristic of the closing force, which great when the clamp is closed, whereby the rod-type design is guided through an opening (O) within the second permanent magnet (M2).

10. The clamp (1) according to one of the preceding claims 1, characterized in that the fluid-carrying channel (L) is arranged between the permanent magnets (M1, M2).