阅读说明：本技术 第一连接部件和第二连接部件 (First and second connection parts ) 是由 T·韦伯 R·伯里奇 G·马杰 于 2014-11-04 设计创作，主要内容包括：本发明涉及一种第一连接部件和一种第二连接部件。所述连接部件能够以液密方式彼此连接并能够通过至少一个锁定元件彼此锁定。所述连接部件中的一个具有至少一个在闭合状态下阻挡流动的可开通的密封元件,特别是隔膜或密封盘,且另一个连接部件具有至少一个用于开通所述密封元件的开通元件。所述连接部件中的一个具有至少一个突起,且另一个连接部件具有至少一个容纳区,所述开通元件和所述密封元件相对于彼此设置成使得只有当所述突起插入所述容纳区时所述开通元件才开通所述密封元件。(The present invention relates to a first connecting part and a second connecting part. The connecting parts can be connected to one another in a fluid-tight manner and can be locked to one another by means of at least one locking element. One of the connecting parts has at least one openable sealing element, in particular a diaphragm or a sealing disk, which blocks a flow in the closed state, and the other connecting part has at least one opening element for opening the sealing element. One of the connecting parts has at least one projection and the other connecting part has at least one receiving region, the opening element and the sealing element being arranged relative to one another such that the opening element opens the sealing element only when the projection is inserted into the receiving region.)

1. A first connecting component configured for use with a second connecting component to form a connector, comprising:

the body is provided with a plurality of grooves,

a bayonet pin is arranged on the upper surface of the shell,

a projection, and

a sealing element.

2. The first connecting member as recited in claim 1, including a gripping portion at the body for allowing a user to grip the connecting member.

3. A first connecting part according to claim 1 or 2, characterised by comprising a cone and a hose base.

4. A first connecting part according to claim 1 or 2, characterised by comprising a sealing surface for a sealing element of the connecting part.

5. A first connecting part according to claim 1 or 2, characterized in that it comprises a peripheral latching projection to which an additional part, in particular a marking ring, can be attached.

6. A first connection part according to claim 1 or 2, comprising a marker ring comprising the protrusion as at least one marker pin extending in a longitudinal direction and in a circumferential direction of the marker ring, wherein at least one of the bayonet pins is provided on the marker ring and is configured to mate with a groove present on a second connector part.

7. A second connection component configured for use with a first connection component to form a connector, comprising:

the body is provided with a plurality of grooves,

a bayonet groove is arranged on the upper surface of the shell,

an accommodation area, and

the element is switched on.

8. Second connection part according to claim 7, wherein the receiving area is configured to receive a protrusion, in particular a marking pin of the first connection part.

9. Second connection part according to claim 7 or 8, wherein the bayonet groove is configured to receive a bayonet pin of the first connection part, wherein the bayonet groove extends in a longitudinal direction of the body in a first part and in a radial direction of the body in a second part.

10. The second connection part according to claim 7 or 8, wherein the opening element is formed as a stopper of a sealing element configured to pierce the first connection part in a state where the first connection part and the second connection part are connected to each other to form the connector.

11. The second connection part of claim 7 or 8, further comprising a latch element configured to secure the first connection part to the second connection part.

Technical Field

The invention relates to a connector comprising at least one first connecting part and at least one second connecting part, wherein the connecting parts can be connected to one another in a fluid-tight manner and can be locked to one another by means of at least one locking element, wherein one of the connecting parts has at least one openable sealing element, in particular a membrane or a sealing disc, which blocks through-flow in the closed state, and the other connecting part has at least one opening element for opening the sealing element, and wherein one of the connecting parts has at least one projection and the other connecting part has at least one receiving region.

Background

In extracorporeal blood treatment, the treatment liquid is usually provided in a bag. Wherein a plurality of therapeutic solutions having different compositions and concentrations of individual solution components may be provided depending on the type of treatment and the needs of the patient.

The bag generally has a connecting part which can be connected with a complementary connecting part, i.e. a connecting part which can be connected with a bag connecting part, in order to remove the treatment liquid from the bag for treatment and transport thereof, for example, into a hose system in which the complementary connecting part is arranged.

In particular, in the case of simultaneous use of a plurality of treatment liquids in a treatment, there is a risk that individual bags are not connected to the connection of the hose system provided for this purpose due to confusion. This can lead to incorrect liquids being used for blood treatment or for another treatment and in the worst case being delivered to the patient, which can be accompanied by considerable health risks.

It is therefore desirable to provide a connector such that a bag of treatment fluid can only be associated with the correct one of the connection sites provided for this purpose, thereby eliminating confusion. It is known from the prior art to provide a connector comprising two connecting parts, wherein a locking protrusion is provided at one connecting part and a complementary protrusion is provided at the other connecting part, which in the connected state cooperate and in this way "signal" the connection, according to WO 09/024807a 1. Furthermore, it is known from WO 11/131783a2 to connect a medical container to an injection device by means of a connector. The connection of complementary connection components of a marker (code) is disclosed. A coding protrusion is used which snaps into a recess.

Disclosure of Invention

The object underlying the invention is to further develop a connector of the above-mentioned kind such that it is possible to avoid particularly reliably the supply of incorrect treatment liquid to the patient by mistake.

This object is achieved by a connector having the features of claim 1, wherein an opening element and a sealing element (in particular a membrane, a sealing disc or the like) are respectively provided, which blocks through-flow and can be opened, the opening element and the sealing element being arranged relative to each other such that the opening element opens the sealing element, in particular the membrane or the like, only when the projection has been introduced into the receiving region.

The two connecting parts are preferably connecting parts which can be connected to one another in a snap-on connection.

The receiving area and the projection are preferably located at the periphery of the connector part.

Furthermore, it is conceivable for a connecting part to have an opening element (e.g. a cone) which cooperates with a diaphragm or the like (e.g. a slit seal) in a specific position of the connecting part relative to one another, so that the opening element opens the diaphragm. However, this is only possible if the projection has been introduced into the receiving area, and then only if the two connecting parts are matched to one another, i.e. complementary, and not if the two connecting parts are not matched to one another. In this way, it is avoided that opening of the membrane occurs in the event that the two connecting parts are not complementary, since in this case the projection cannot be introduced into the receiving region or at least cannot be introduced into the receiving region to such an extent that the opening element opens the membrane.

This means that the membrane or the like remains closed in this case and incorrect administration of liquid to the patient is precluded.

Thus, the projection and the receiving region as a marking element have the purpose of holding the two connecting parts relative to one another, for example in a form-fitting manner, or not only as a marking element, but also for safety reasons a solution is to be provided according to which administration of incorrect treatment liquids is reliably avoided when incorrectly connected (i.e. when non-complementary connecting parts are connected).

Thus, according to the invention, it is provided that the opening element of one connecting part can break or pierce a membrane or the like, preferably a slit-type membrane of one connecting part, when the projections and the receiving areas of the connecting parts are complementary to one another, i.e. when the connecting parts are mated to one another. If this is not the case, the opening member cannot break or open the septum, thereby reliably avoiding incorrect infusion or administration of the therapeutic fluid.

The opening element can preferably serve as a liquid channel for one of the connecting parts.

The invention further relates to a connector comprising at least one first connecting part and at least one second connecting part, wherein the connecting parts can be connected to one another in a fluid-tight manner and can be locked to one another by means of at least one locking element, wherein one of the connecting parts has at least one sealing element, in particular a sealing ring, having an opening, and the other connecting part has at least one contact surface for the sealing element, and wherein one of the connecting parts has at least one projection and the other connecting part has at least one receiving region, wherein the sealing element and the contact surface are arranged relative to one another such that a fluid-tight connection exists between the first and second connecting parts only when the projection is introduced into the receiving region.

If the connection between the two connecting parts is not performed correctly, this may be indicated by leakage, since in this state there is no liquid-tight connection between the two connecting parts. In this embodiment of the invention, there is a liquid-tight connection in which no outward leakage occurs only when the connection has been established correctly, i.e. when the projection has been introduced into the receiving region.

Instead of a sealing ring, any other suitable sealing element can also be used, so that the term "sealing ring" represents not only a sealing ring but also a peripheral sealing element (e.g. a sealing sleeve, a perforated disc, a square ring, etc.) having an opening for receiving a connection stop (stub).

The invention further relates to a connector comprising at least one first connecting part and at least one second connecting part, wherein the connecting parts can be connected to one another in a fluid-tight manner and can be locked to one another by means of at least one locking element, wherein one of the connecting parts has at least one projection and the other connecting part has at least one receiving region, wherein, in the case of complementary connecting parts, the projection can be introduced into the receiving region.

In this respect, it is provided according to the invention that the projection and/or the receiving area are provided at least one additional component, preferably at an annular or cylindrical additional component, which is guided onto a part of the connecting component and preferably onto its body. In this case, the projection and/or the receiving area are provided at a separate part pushed out of the body. This design is particularly advantageous for economic reasons, since only one single body type needs to be manufactured, which can be combined with a plurality of marking means and closing means.

Combinations of two or all of the three concepts according to claims 1 to 3 are also conceivable according to the invention and are covered by the invention. It is therefore conceivable that the connector is configured on the basis of the configuration according to claim 3, according to the features of claim 1 or 2, or according to the features of claim 1 in addition to the features of claim 2. It is also conceivable that the connector is configured according to the features of claim 1 in addition to the features of claim 2.

A further embodiment of the invention provides that the locking element is formed by at least one pin and by at least one groove-like receiving region for the pin, preferably in that the groove is configured such that it extends over a partial region of the connecting part in the axial direction and over a partial region of the connecting part in the circumferential direction, so that for locking a sliding movement and a rotational movement of the connecting parts relative to one another is required. In this case, the connection of the two connection parts thus takes place in a manner comparable to a snap connection.

One or more latching elements are provided at the recess which come into contact with the pin when both connecting parts reach the locking position. These latching elements can act as a secure lock and can also make a sound when the pin passes over so that the user can perceive that the locked position has been reached. Alternatively or additionally, a tactile feedback can also be envisaged and is also covered by the invention when the locking position is reached, i.e. when the pin snaps over the latching element.

It is preferably provided that the pin is visible when the locking position is reached, so that a visual control of the locking position is possible.

In a further embodiment of the invention, it is provided that an additional component or a further color marking on the connecting part is color-matched to the second connecting part. The same components can also be applied correspondingly to the second connecting part. It can thus be indicated that the two connecting parts are complementary, i.e. can be connected to each other, by means of their color design or by means of an accessory element such as a ring or the like.

It is preferably provided that the additional parts or other marking elements are arranged such that they are visible in the connected state of the connector, so that a visual control of the locking position is possible.

In a further embodiment of the invention it is preferably provided that the additional part has a pressing surface for a sealing element, such as a sealing ring or a membrane, and that the connecting part on which the additional part is arranged has a sealing surface which is contacted by a sealing means, such as a sealing ring or a membrane. In this case, the additional component fulfills not only the function of bearing the projection or the receiving region, but also additionally the function of fixing the sealing device, in particular the sealing ring or the diaphragm, to the connecting component.

The term "sealing element" used hereinafter is to be understood in a broad sense. It represents not only a sealing disk in the form of a diaphragm but also any and all required sealing elements which can be opened in a sealing manner or which already have an opening for receiving the sealing surface of the stop.

In a further embodiment of the invention it is preferably provided that the first and second connecting parts have a body to which the additional part is applied, wherein the body has one or more latching projections which snap into at least one opening in the additional part, wherein the connection between the latching projections and the opening is preferably configured such that it cannot be manually released. It is thus conceivable, for example, to place the additional part on the body or on a part of the body and to lock it, for example by means of a latching connection, and it is preferably provided that the additional part cannot be released from the body or only with considerable effort after the latching connection has been established.

It may furthermore be provided that the at least one projection is provided as a raised portion which extends in the longitudinal direction and in the circumferential direction of the connecting part; and/or the receiving area extends in the longitudinal direction and in the circumferential direction of the further connecting part.

It is preferably provided that the projection or the receiving area in the complementary connecting part is dimensioned such that the at least one projection can be received in the receiving area, so that this is not the case for connecting parts that are not complementary to one another. It is thus conceivable, for example, for complementary connecting parts, that the projection can be pushed completely into the receiving region, which is not the case for non-complementary connecting parts. The result of this is that, for non-complementary connecting parts, as already described in more detail above, a push-in of the connecting parts is possible (where it is entirely possible) only to the extent that the opening element does not open the diaphragm.

In a further embodiment of the invention, it is provided that the opening element is preferably configured as a conical stop which forms a region through which the liquid flows in the connected state of the connecting part. The stop member serves as a contact protection member and is disposed rearwardly with respect to the open end region of the connector where connection with another connecting member is effected.

It may furthermore be provided that both connecting parts have gripping surfaces which lie on a common plane in the locked state of the connecting parts and which do not lie on a common plane in the unlocked state of the connecting parts. Thus, visual control can also be easily performed as to whether the two connecting members have been locked in the desired positions or not. In this case, a haptic control when the connecting part reaches the desired position can also be performed alternatively or additionally, which is likewise covered by the invention.

Drawings

Further details and advantages of the invention will be described in more detail with reference to embodiments shown in the drawings. There are shown:

FIG. 1: a perspective view of the body of the connecting member;

FIG. 2: a perspective view of the septum;

FIG. 3: a perspective illustration of an additional component;

FIG. 4: a different view of the second connecting member;

FIG. 5: different views of the protective cover as a single component in the placed state;

FIG. 6: a perspective view of a second attachment member having a color-coded ring;

FIG. 7: different views of the connector in the locked and unlocked states;

FIG. 8: a cross-sectional illustration through the connector in a locked condition;

FIG. 9: a perspective illustration of two connecting members that are not complementary;

FIG. 10: illustration of connecting parts complementary to each other.

Detailed Description

Fig. 1 shows a body 10 which, together with the additional part shown in fig. 3 (hereinafter: the marking ring), forms a first connecting part.

The second connecting part is formed by a hose connector 40 shown in fig. 4.

The body shown in fig. 1 remains unchanged in all variants of the connector.

This has the following advantages: there is always only one member that has the potential to come into contact with the medical solution or drug.

Since the color marking is performed by other connector members, i.e. by the marking ring 30 and the hose nipple 40, any and all input of elutable or contact-active colored particles can be avoided in the body 10 according to fig. 1. In this way, because no material variable is in contact with the pharmaceutical agent or solution, interaction between any colored particulate matter and the pharmaceutical solution is minimized.

In fig. 1, reference numeral 12 shows the cone in a non-operating state and reference numeral 13 shows a hose seat (solution side) for inserting a hose. These two components form the solvent contacting side.

Reference numeral 14 indicates a gripping surface of the first connector element or body, which is flat and which intuitively predefines the correct connection position by its haptics and optics.

A preferred peripheral latch projection for the marker ring is shown by reference numeral 15 in fig. 3. Alternatively, a welded connection is also possible.

Reference numeral 16 indicates a sealing surface of a sealing element such as that shown in fig. 2.

The sealing element according to fig. 2 with the reference numeral 20 can be, for example, a silicone sealing disk with a slit opening 22. Alternative sealing elements are O-rings, sealing rings or elements of different elasticity.

Different designs of the sealing element can generally also be achieved, or double sealing can also be achieved by introducing further sealing elements, which, however, is accompanied by increased effort and increased costs.

Reference numeral 30 in fig. 3 denotes a marker ring which is placed on the portion of the body shown on the left side of the drawing.

The marker ring satisfies the following functions: the hose connector shown in fig. 4 is mechanically marked, color-marked and the sealing element is retained and sealed, preferably without welding or bonding.

The security against rotation of the marker ring 30 is given by the geometry of the latching projections 15 or the welding projections and the openings 32 of the marker ring. The marker ring is preferably non-releasably snapped onto the body 10 or welded or otherwise secured thereto by a corresponding shape of the latch projection at the body.

In fig. 3, reference numeral 31 shows a marking pin, i.e. a projection in the sense of the invention, the position of which can be changed from connector to connector.

As can be seen from fig. 3, the marking pins extend on the one hand in the longitudinal direction of the marking ring 30 and, on the other hand, in the circumferential direction.

Reference numeral 32 indicates an opening for the latching projection 15 of the body 10 and at the same time serves as a fixing against the rotation of the marking ring 30.

A pin for a bayonet coupling is designated by reference numeral 33 which cooperates with a groove of the hose coupling 40 according to fig. 4 to form a locking element.

The ring of the marking ring 30, which is also visible in the connected state, serves as a color marking indicated by reference numeral 34. The entire marker ring 30 is preferably colored.

The reference numeral 35 finally indicates an inwardly arranged pressing surface and which serves to press the sealing element, which in turn contacts the sealing surface 16 of the body 10 according to fig. 1. Thus, the sealing element is pressed between the body and the marker ring.

The recess serving as contact protection for the sealing element is indicated by reference numeral 36.

Due to the coloring and due to the mechanical marking, the connection is clear and cannot be confused.

As mentioned above, fig. 4 shows a hose coupling forming a counterpart to the body 10 and to the marker ring 30.

Only the respectively correct hose connector is preferably mounted on the correspondingly matched marking ring 30. The feedback of the firm connection made can occur visually and acoustically as well as tactilely.

As can be seen in fig. 4, the marker ring has a flat gripping surface 41, which intuitively predefines the correct connection position. In the coupled condition, these gripping surfaces are in the same plane as the corresponding surfaces 14 of the body 10.

Reference numeral 42 designates a receiving region in the sense of the present invention, which is configured as an inwardly arranged opening extending in the circumferential direction.

The opening is intended to receive a marking pin 31 of the marking ring 30. Their position can vary from connector to connector.

The holes for the pins 33 of the bayonet connection at the marking ring 30 are indicated by reference numeral 43. As can be seen from fig. 4, the groove for receiving the pin 33 extends, on the one hand, in the longitudinal direction of the hose connector and, on the other hand, in the radial direction.

The latching element is designated by reference numeral 44 for connection assurance against self-release and for visual and tactile feedback. Thus, the user may be able to easily detect that latching and thus sufficient locking has occurred.

The color marking providing a clear association between the hose connector and the body or the marking ring 30 can occur, for example, by a fully colored hose connector that can have the same color as the marking ring 30 or by a snap-in or colored ring at one location. What is important is the color correlation between the hose connector on the one hand and the first connecting part, i.e. the body or the marking ring 30, on the other hand.

The cone, i.e. the opening element in the sense of the present invention, is indicated by reference numeral 46. This cone is used for sealing at the body by means of the elastic sealing element according to fig. 2.

The recess of the cone as a contact protection is designated by reference numeral 47 and the bevel for easier accurate positioning is designated by reference numeral 48.

Reference numeral 50 in fig. 5 indicates a protective cover that can be placed on the body 10 with the marker ring 30. As can be seen from fig. 5, the protective cover 50 has peripheral marking openings 51 so that the protective cover 50 can be placed on any desired marking ring 30 and is therefore universal. The use of a universal adapter, for example with the possibility of providing a standard luer connection on all connectors, would also be possible using this principle.

The right hand illustration of fig. 5 shows a cross sectional illustration and illustrates the seal disk support according to fig. 2 in place at location 52 to hold the seal disk sealed and thus not leaking when not in use.

The hose connector, i.e. the second connector according to the invention, is indicated in fig. 6. As can be seen from fig. 6, a snap-on connected marker ring 60 is provided, which may have a different color than the hose connector itself. If the monochrome markings or the coloring of the hose coupler itself is not sufficient, the color range can be extended by one or more such marking rings 60 as desired. This naturally does not apply only to the hose connector side but also to the body side of the marker ring.

By this color marking in the form of a ring, it is possible to dispense with coloring of the plastic at all in the solution contact area of the entire connector.

The connection principle of the two connecting parts can be seen from fig. 7.

According to the left-hand illustration of fig. 7, the latch connection or locking is open; whereas in the right-hand illustration of fig. 7, he is closed.

As can be seen from fig. 7, in the right-hand illustration, in the locked or closed position, the gripping area of the first connector and the gripping area of the second connector are in one plane. The gripping area of the connector is designed such that a preferred position in the finger when gripping can be produced with maximum efficiency, i.e. a pre-positioning according to the illustration on the right hand side of fig. 7. The right-hand illustration in fig. 7 is then achieved by a rotational movement.

The pre-positioning is very advantageous for the positioning of the latching element.

As can also be seen from fig. 7, the first and second connection parts each have a bulging region, the radius of which with respect to the connector shaft is larger than the distance of the gripping region to the connector shaft and which is designed to be circular. Furthermore, the connecting members each have one or more almost flat or planar regions which form the gripping region and which are set back with respect to the outer periphery of the bending region. The slots in the gripping area also provide a grip for the wet connector. Introducing a ramp at this point facilitates accurate positioning.

As can be seen from fig. 7, in the right-hand illustration, in the locked position the pin 33 of the marking ring 30 is received in the end region of the recess of the hose connector 40 and is secured there by a designated latching element. In this way, a fully locked visual control is also possible.

Fig. 8 shows in a sectional illustration that the cone 46 penetrates the sealing disk 20 and, in the connected and locked state, opens it at position a, so that throughflow of the connector is possible.

The connectors are properly connected.

Fig. 9 shows a situation in which two non-complementary connecting parts, i.e. "wrong" connecting parts, cannot be connected to each other.

As can be seen from fig. 9a, in this case there is a gap at point B and rotation is prevented due to the fact that the pin 33 is not yet accommodated in the part of the groove extending in the circumferential direction.

As can be seen from fig. 9b, in this case the cone cannot pass through the sealing disk (see reference character C), so that throughflow is not possible.

The connection is prevented because, according to fig. 9c, the marking pin, i.e. the projection, is wider than the receptacle, so that introduction is not possible.

In contrast, fig. 10 shows an embodiment with complementary connecting parts, in which the marking pin 31 just fits into the opening 42, so that the gap B can be overcome and the two connecting parts can be pushed together completely and then be rotated.

Further preferred properties and advantages of the connector according to the invention will be described in more detail below:

for reasons of confusion, the invention provides the greatest mechanical safety that incorrect connecting parts cannot be connected and through-flow cannot occur because the cone or the opening element is located only in front of the sealing disk or the diaphragm.

Safe operation is possible due to the colour marking and due to intuitive operation (known to be common to bayonet fittings) and positioning by means of the gripping surface.

As is known from bayonet fittings, there is preferably no elastic element which snaps directly at the pin. In this sense, the spring back by the membrane is not to be understood as an elastic element.

When disconnected, there is drip protection and a through flow barrier due to the use of the sealing disk.

Due to the sealing surface arranged behind, there is contact protection.

The color markings can be variable and can be formed, for example, by rings or other markings.

In the long term, only the unchanged components can be designed to contact the article, without said components having color and material variations.

Since the latching element and the sealing element prevent the only retraction, an accidental disconnection is avoided. The maximum safety against disconnection is ensured by the bayonet connection principle when tensile stresses suddenly occur. In contrast to the screwing movement, no engagement around is preferably required when the connector is closed. A lesser degree of rotation is sufficient.

This is also advantageous for the fact that the hose is thus only slightly twisted.

An end position of the latching connection is defined, a latching position and a latching force with respect to the sealing element inside the connector are defined.

The connection cannot be too loose or too tight. The following settings should be set: it does not release itself and is not so tight as to be substantially impossible to release.

Feedback of the closing connector can be fed back visually through the position of the gripping surface and through the visible bayonet joint. Audible and tactile feedback is also conceivable and advantageous with a closed latch.

The connector can also be manipulated to a large extent "blindly" by visually impaired persons, since there is no need at all to use colour markings for correct connection. These persons can orient themselves, for example, according to the orientation of the gripping surface or also according to a fully locked audible or tactile feedback.

The body according to fig. 1 and the universal protective cover according to fig. 5 are preferably identical in all connectors; it is thus possible to reduce costs with a very high unit area without compromising on safety.

Preferably, the same components are always contacted with the solution.

The principle of the universal protective cover according to fig. 5 can also be reused for universal adapters adapted to be mounted on all connectors.

The marking ring according to fig. 3 and the sealing element according to fig. 2 are preferably fixed in their position only by means of non-releasable snap-in elements, without gluing or welding. Nevertheless, welding and bonding are alternatively possible.

Due to the free number and positionability of the marking pins, the number of alignable is theoretically unlimited and is limited only by the currently available space of the connector, which is ultimately limited by the size of the connector.

Higher-ranking schemes that fit into multiple subgroups, but not all subgroups, are also conceivable by inserting, for example, third marking pins. It is thus conceivable, for example, that connector a and connector B are incompatible with each other, but that the "primary key C" is adapted to be mounted on both connector a and connector B. The "universal key D" can then be fitted back to the counterpart.

Embodiments and preferred aspects of the present invention relate to bayonet-like closure units without the need for resilient elements and to mechanical marking by connection of a marking pin.

In contrast to confusion, the operation of the connector is non-illustrated, intuitive and safe, and has multiple feedback options to the user whether the connection is closed or not. Incorrect operation is also largely precluded for untrained technicians. Operability can be achieved intuitively for non-professionals and blind persons, but also for self-connected patients, e.g. dialysis at home.

As mentioned above, the number of possible markings is limited only by the size of the connector. Connectors can be used as generic keys to implement multiple primary keys with subgroups labeled with this type.

The range of dialysis uses is described above. However, the present invention is not limited to this range of use. Nor does it completely provide a limitation on medical indications. The connection according to the invention is conceivable and has safety against confusion and contact, whether or not a connection of a line through which fluid and/or gas flows in the low-pressure range is necessary. It is not important in this respect whether the principle is applied by a single-use connector or a connector that is used several times.

According to an embodiment, the advantages of the connector can be described as follows:

maximum mechanical exchangeability, i.e. the incorrect connecting part cannot be connected and no throughflow is possible because the cone ends before the sealing disk

-colour marking

Intuitive operation (the principle of bayonet fittings is familiar to everyone and visible at a glance. user-accessible positioning aid by means of a predefined gripping surface)

No need for a separately designed elastic element (in relation to the use of a sealing disc, however, a slight elastic action takes place, which of course facilitates the operation of the connector)

Drip protection and block through-flow when disconnected (in relation to the use of a sealing disk)

Contact protection due to a sealing surface arranged behind (with respect to a standard luer connection)

Variable colour marking (optional)

There is only one member with long-term product contact and it can always have the same design for different connectors with different colors and/or material variations

Accidental disconnection is not possible because the latch protrusion and the sealing element prevent the only retraction. Due to the principle of the snap connection, the maximum firmness against disconnection is ensured when tensile stress suddenly occurs

In contrast to the screwing movement, no engagement is required around the connector when it is closed

Twisting the hose only to a small extent

-end positions defining a latching connection, latching positions and latching forces with respect to a sealing element inside the connector

Visual feedback of the closing connector by the aligned position of the gripping surface and due to the visible bayonet connection

-acoustic feedback; closed audible latch

-tactile feedback; closed touchable latch

The connector can also be operated "blindly" by people with poor eyesight. Since there is no need to identify the color markings of the connector at all for a correct connection.

The base and the universal protective cover or the additional component are identical for all connectors, so that costs can be reduced with high unit volumes without compromising safety

The design of a universal protective cover or universal adapter is feasible for all color and indicia variants

The marking ring and the sealing element can be fixed in their position by means of non-releasable snap-in elements without gluing and welding (however, for the connection welding and gluing are still optionally possible).