BRUSTHAUBE

Description

TECHNICAL FIELD

[0001] The present invention relates to a breast shield for pumping human breast milk. STATE OF THE ART

[0002] Manually and motorized breast pump units for pumping human breast milk are known. They feature one or two breast shields for sealingly applying to the mother's breast. This at least one breast shield is connected directly or via a suction line to a manually or motorized breast pump. The breast pump generates a cyclically changing vacuum, which is transmitted to the breast shield to pump milk from the mother's breast.

[0003] Breast pump units are designed to enable pumping of breast milk that is as close as possible to a baby's natural sucking action. Special pumping sequences with varying vacuum pressure and pumping frequency are used. Breast shields are also available in a wide variety of designs, with soft inserts called liners designed to ensure a comfortable fit. Breast shields are also available that are designed to stimulate the mother's breast through massage.

[0004] Classic breast shields feature a funnel for sealing and accommodating the mother's breast. The funnel ends in a tubular nozzle, which can be connected via an adapter either directly or via a suction line to the breast pump or to a milk collection container. During use, the nipple protrudes into this nozzle and is drawn into the nozzle when the cyclically changing vacuum is applied. The nozzle should be large enough not to restrict nipple movement.

[0005] To ensure optimal use of the applied vacuum, the volume to be evacuated is kept as small as possible. This minimizes the dead volume.

[0006] US 4,607,596 discloses a device whose basic principle is intended to be applicable in a milking machine for cattle as well as for pumping human breast milk. The associated breast shield comprises a rigid base body with a flexible insert. Two chambers are provided that can be subjected to a pulsating negative pressure, with the negative pressure being generated by the same breast pump. The first chamber is formed by the interior space in which the mother's breast is held. The second chamber is located between the flexible insert and the base body.

[0007] In US 7 988 661 B2, the breast shield also has two chambers, which can be pressurized with different and independent pressures. In particular, negative pressure and positive pressure can be applied. This publication shows a variety of different breast shields. Figures 16A and 16 show a breast shield with three chambers, which are intended to simulate a baby's sucking. The nipple is pulled out when the negative pressure is applied. The three chambers can be pressurized independently of one another, so that a rotational movement around the longitudinal axis of the breast shield can also be simulated. In the embodiment according to Figure 17, the flexible insert has inward-facing ribs in a hollow cylindrical area, which massage and stimulate the nipple and the adjacent tissue of the mother's breast.In the embodiments according to Figures 18 and 19, the chambers form indentations towards the nipple in order to massage it.

[0008] WO 2014 / 094186 A2 and WO 2014 / 094186 A1 describe breast shield units with a flexible insert for accommodating the mother's breast and nipple, as well as a separate media separation membrane to protect the vacuum source. The movement of the media separation membrane is such that it does not contact the nipple and thus does not impede nipple movement.

[0009] WO 2014 / 063261 A1 discloses a breast shield with a flexible insert that also serves as a media separation membrane. This flexible insert is held in a twisted position in a hollow cylindrical receptacle and accommodates the nipple. When a negative pressure is applied between the receptacle and the insert, the insert increases its milk flow.

[0010] WO 2011 / 037841 A2 shows a breast shield which has inflatable cushions in the transition between the funnel and the tubular nozzle.

[0011] US 9 248 223 B2 describes a breast shield with a soft insert which uses negative pressure to exert peristaltic pressure on the nipple in order to pump milk.

[0012] WO 2016 / 007561 A1 shows a breast shield insert which is provided with grooves in the area of the nipple in order to increase the surface area.

[0013] US 2016 / 0058928 A1 discloses a breast shield designed to resemble a baby's mouth. The nipple is held in a flexible breast shield portion that can collapse asymmetrically to mimic the baby's mouth movement. The negative pressure is directed to the breast shield via the milk collection container. US 2016 / 206794 A1 discloses a breast shield with a nipple-receiving area, which is tapered. The inner wall of the receiving area is designed to tightly accommodate the nipple.

[0014] Although these newer breast shells show some good approaches to achieving a close approximation of natural sucking, an optimal imitation of nature and thus the optimal shape and pressure application of a breast shell has not yet been found. PRESENTATION OF THE INVENTION

[0015] It is therefore an object of the invention to provide a breast shield which enables a maximized pumping performance and a minimized pumping time per pumping session.

[0016] This object is achieved by a breast shield having the features of patent claim 1. Advantageous embodiments are the subject of the subclaims.

[0017] The breast shield can be used in a method for operating a breast pump unit for pumping human breast milk, wherein the breast pump unit has a vacuum pump for generating pressure and at least one breast shield for sealingly applying to a mother's breast to be pumped. The breast shield has an inner chamber for receiving a nipple of the mother's breast and at least one outer chamber which at least partially surrounds the nipple. The inner chamber is provided with a first pressure from the vacuum pump and the at least one outer chamber is provided with at least a second pressure from the vacuum pump. An approximately temporally constant pressure is used for the first pressure and a pulsating pressure is used for the at least one second pressure. Alternatively, a pulsating pressure is used for the first pressure and an approximately temporally constant pressure is used for the at least one second pressure.

[0018] The approximately time-constant pressure is a pressure which either remains constant over the entire period of the pumping process or which changes over time several times more slowly than the second pulsating pressure.

[0019] "Pulsating pressure" refers to a changing pressure that preferably changes cyclically. The pressure preferably changes evenly, e.g., sinusoidally. However, it can also change unevenly within a cycle and / or there can be regular or irregular pauses between cycles.

[0020] In the prior art, a pulsating, i.e., changing, pressure is applied to the cavity of the breast shell, which accommodates the nipple, to simulate the sucking action of an infant. The applied negative pressure stretches and elongates the nipple during pumping. In contrast, the nipple is not stretched or hardly stretched when using the method used here, hereinafter referred to as the first method. By applying the external, changing pressure, the natural milk ducts running through the nipple are kept open, opened regularly, and / or further expanded radially, allowing the milk to flow freely.

[0021] The constant negative pressure applied in the cavity of the breast shield, i.e. directly to the nipple, hardly influences the shape of the nipple and mainly serves to hold the position of the breast shield and to drain the expressed breast milk.

[0022] Preferably, the values of the first pressure and the at least one second pressure are in a range in which the nipple of the mother's breast remains substantially unchanged in its length.

[0023] This first method thus allows for maximized pumping performance. Because the diameter of the nipple milk ducts is maximized, a minimized pumping time per pumping session is also possible.

[0024] In a preferred variant of the first method, the breast shield has a flexible inner part, a so-called liner. This flexible inner part divides the breast shield into the inner chamber and at least one outer chamber. The flexible inner part is subjected to the first pressure from the inside and to the at least one second pressure from the outside.

[0025] To position the breast shield on the mother's breast, the first pressure is preferably applied in the first chamber in a first step, so that the flexible inner part is drawn inward to contact the nipple. In a subsequent step, at least one second pressure is applied. This minimizes the dead volume. The nipple is massaged, and the external, changing pressure can be optimally applied to the nipple.

[0026] In an alternative variant, to position the breast shield on the mother's breast, in a first step, at least a third pressure is applied in the at least one second chamber, wherein the third pressure is constant over time. The flexible inner part is pulled outwards by this third pressure to form an interior space for accommodating the nipple. In a further step, the first and at least one second pressure are applied to pump out milk. This optimally protects the nipple tissue when placed inside the breast shield, and the flexible inner part can then fit snugly against the nipple over its entire circumference.

[0027] Preferably, a negative pressure is used for the first pressure, and a negative pressure and / or a positive pressure is used for the at least one second pressure. By having the second pressure be a changing negative pressure that temporarily changes to a positive pressure, a wide range of options for activating and massaging the nipple is provided.

[0028] Preferably, the first print and the at least one second print are used independently of each other. This also increases the range of the above-mentioned possibilities.

[0029] Preferably, the first pressure and the at least one second pressure are applied in dependence on one another according to a control unit.

[0030] Exactly one second chamber can be provided. This type of breast shell is simple and inexpensive to manufacture. In another embodiment, at least two second chambers are provided, each independently supplied with a second pressure. Preferably, the ratio of the at least two second pressures relative to each other is varied over time. This allows for the most natural massage of the nipple during pumping, i.e., a stress on the nipple similar to the situation in the infant's mouth.

[0031] The breast shield preferably comprises a flexible inner part with an inner chamber for receiving a nipple of the mother's breast and at least one outer chamber that at least partially surrounds the nipple. The inner chamber is supplied with a first pressure from the vacuum pump, and the at least one outer chamber is supplied with at least a second pressure from the vacuum pump. The flexible inner part is pressurized such that, in a first position, it rests annularly against the nipple and, in a second position, it releases the nipple in a radial direction.

[0032] This also allows for pumping breast milk without stretching the nipple or reducing the diameter of the natural milk ducts. Depending on the type of pressure applied, the clear width of the natural milk ducts can also be increased.

[0033] In the current state of the art, the nipple is enclosed in the breast shield without contact. The breast shield typically rests exclusively on the adjacent breast tissue. These breast shields massage the breast tissue. In the procedure described here, however, the nipple is contacted, preferably tightly enclosed, and massaged depending on the variant of the second procedure. Preferably, only the nipple or at most part or all of the areola is contacted.

[0034] In a preferred variant, the first pressure is pulsating and the at least one second pressure is constant. In another variant, this is reversed.

[0035] The methods, in particular the first method described above, can be optimally used, for example, with the breast pump units and breast shields described below. However, the breast pump units and breast shields described below can also be operated with other methods.

[0036] A breast pump unit for pumping human breast milk comprises a vacuum pump for generating pressure and at least one breast shield for sealingly contacting a breast to be pumped. The breast shield has an inner chamber for receiving a nipple of the breast and at least one outer chamber that at least partially surrounds the nipple. The inner chamber is designed to receive a first pressure from the vacuum pump, and the at least one outer chamber is designed to receive at least a second pressure from the vacuum pump. The first pressure is an approximately constant pressure over time, and the at least one second pressure is a pulsating pressure.

[0037] The breast shield of this first breast pump unit preferably has a flexible inner part that divides the breast shield into the inner chamber and the at least one outer chamber. The flexible inner part can be subjected to the first pressure from the inside and to the at least one second pressure from the outside. Such flexible inner parts are often called liners. The liner can be detachably held in a rigid or semi-rigid breast shield body, or it can be manufactured together with the breast shield body and cannot be removed from it without causing damage.

[0038] This first breast pump unit preferably has at least one sensor for determining the position of the nipple during the pumping process. This makes it possible to determine whether and, if so, to what extent the nipple is stretched or compressed by the applied pressure. The control system is preferably designed to vary the first pressure and / or the at least one second pressure in accordance with this specific position of the nipple. This allows the breast pump to be individually adapted to the mother's needs. This makes it possible for every mother to pump without her nipple being overstretched or the nipple's milk ducts becoming too small. The at least one sensor can be used additionally or alternatively to determine the point, relative to the longitudinal axis of the breast shell, at which the inner chamber collapses or the flexible inner part closes the chamber.

[0039] Below, various designs of breast shields are mentioned, which can be used in particular in the above-mentioned methods and in the breast pump units described in this text. These breast shields each have a support area for sealingly contacting the human breast and an inner chamber for accommodating a nipple of the mother's breast.

[0040] The breast shield preferably has at least one outer chamber that at least partially surrounds the nipple. The inner chamber is designed to accommodate a first pressure from the vacuum pump, and the at least one outer chamber is designed to accommodate at least a second pressure from the vacuum pump. The first pressure is an approximately constant pressure over time, and the at least one second pressure is a pulsating pressure.

[0041] Since the breast shield only needs to cover the nipple, it can be made relatively small. It can also be used discreetly and hands-free under clothing. Furthermore, the dead volume is minimized, allowing the breast pump unit that generates the two pressures to be made correspondingly small. This minimizes costs and optimizes performance.

[0042] This breast shield preferably has a flexible inner part that divides the breast shield into the inner chamber and the at least one outer chamber. The flexible inner part can be subjected to the first pressure from the inside and to the at least one second pressure from the outside. The flexible inner part is preferably a flexible insert that is permanently or detachably connected to a breast shield body. The flexible inner part simplifies the production of the breast shield. It also enables a tight fit around the nipple, providing a pleasant and effective massage and optimal stimulation of the nipple.

[0043] The inner chamber of the breast shield according to the invention is conical across its entire receiving area. This conical shape prevents the nipple from being over-elongated by the applied negative pressure, which would otherwise reduce the diameter of the natural milk ducts. Furthermore, the conical shape allows for optimal snug coverage of the nipple over its entire length.

[0044] The inner chamber of the breast shield according to the invention has an inner wall which, in addition to its conical shape, is equipped with retaining means to hold the nipple during the pumping process. These retaining means prevent the nipple from being stretched during pumping.

[0045] A breast shield described is equipped with at least one sensor to determine the position of the nipple during the pumping process. As already mentioned above, the pressure can be adjusted according to this measurement signal so that the change in nipple length is optimized. In particular, the change is minimized.

[0046] The inner chamber of the breast shield has a longitudinal axis. The inner chamber collapses according to the applied pressure. The breast shield is equipped with at least one sensor to determine the position at which the inner chamber collapses. This collapse also holds the nipple back, thus preventing unwanted stretching. The sensor allows you to determine whether the inner chamber collapses at the desired location. If not, the applied pressure(s) can be adjusted and / or the placement of the breast shield on the nipple can be adjusted.

[0047] The contact area of a breast shield ends at the breast end in a soft, airtight cushion. The cushion preferably has a circumferential inflatable cavity. This cushion allows for a pressure-free yet tight fit against the nipple or areola. This is comfortable for the mother with sensitive or already inflamed breasts. Furthermore, the breast shield does not create a kink in the breast, even if the mother presses too hard on it. Milk flow is not impaired or affected.

[0048] A breast shield also described has a circumferential pocket on the breast side to collect drops of breast milk when the breast shield is removed. This ensures that no drops are lost when the breast shield is removed from the breast. All of the breast milk can be used, down to the last drop. This is especially important in premature babies, when the mother is barely able to produce milk herself in the early stages.

[0049] Preferably, this sixth breast shield comprises a flexible inner part, which forms the support area for sealingly contacting the human breast and an inner chamber for receiving a nipple of the mother's breast, with the circumferential pocket formed in the flexible inner part. Preferably, the flexible inner part can be folded outward so that the collected milk drops can be more easily removed from the breast shield.

[0050] A breast shield also described comprises an outer breast shield body and a flexible inner part, wherein the flexible inner part forms the support area for sealingly resting on the human breast. The flexible inner part divides the breast shield into the inner chamber for receiving a nipple of the mother's breast and into at least one outer chamber which at least partially surrounds the nipple. The inner chamber is designed to absorb a first pressure from the vacuum pump, and the at least one outer chamber is designed to absorb at least a second pressure from the vacuum pump. The flexible inner part is formed in one piece. The breast shield has a further chamber in the form of a hollow space, which is divided from the at least one outer chamber by a fixed or detachable connection between the flexible inner part and the outer breast shield body forming a circumferential partition.The hollow chamber is located in the contact area of the breast shield. This creates an inflatable cushion for optimal placement of the breast shield on the nipple. The same division principle can also be used to create more than one outer chamber, which can be subjected to different pressures to massage and stimulate the nipple differently in different areas.

[0051] A breast shield also described defines a longitudinal axis. The inner chamber is delimited by an outer region, which is asymmetrically designed. At least a portion of the outer region has an outer chamber, the inside of which can be subjected to pressure. Preferably, a portion of the outer region is variable in its stiffness and / or hardness, for example, by means of a rigid adjustment element. This breast shield imitates the mouth of an infant with palate and tongue.

[0052] A breast shield unit for pumping human breast milk has a vacuum pump for generating pressure. The breast shield unit comprises a breast shield with an interior space for accommodating a nipple and a flexible milk collection container. The interior space has a first opening for accommodating the nipple and, as the only further opening, a connection opening to the milk collection container, wherein the breast shield is hermetically connected to the milk collection container via this opening. Means are provided which cyclically enlarge the interior space for the purpose of generating a negative pressure in the interior space for pumping the breast milk. This second breast shield unit can be a further development of the first breast shield unit described above. This breast shield unit minimizes contact of the milk with the ambient air, so that contamination of the milk can be largely avoided. This is particularly important in the neonatology field.

[0053] The means of this second breast shield unit are preferably spring tongues and cords that actuate the spring tongues. Such a breast shield unit is inexpensive and easy to manufacture. Its use is also relatively simple. It is, in turn, ideal for use in neonatology.

[0054] A breast shield also described has a fan that blows air toward the mother's breast. This air mimics the baby's breathing and thus promotes the mother's milk production.

[0055] The features of all the above-mentioned breast shields can be optionally combined with one another to create further breast shields in the sense of the invention.

[0056] Further embodiments are specified in the dependent claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Preferred embodiments of the invention are described below with reference to the drawings, which are for illustrative purposes only and are not to be construed as limiting. In the drawings: Figure 1 shows a schematic representation of a human breast with possible shapes of the nipple; Figure 2a shows a schematic representation of a breast shield according to the invention in a first embodiment before pressure is applied; Figure 2b shows the breast shield according to Figure 2a with pressure applied in an inner chamber, e.g. vacuum; Figure 2c the breast shield according to Figure 2a with pressures applied in the inner and in an outer chamber; Figure 3a a schematic representation of a breast shield with sensors, in a starting position; Figure 3b the breast shield according to Figure 3a with pressure applied in an inner chamber; Figure 4a a schematic representation of a breast shield before application to the mother's breast; Figure 4b the breast shield according to Figure 4awhen placed on the mother's breast; Figure 4c the breast shield according to Figure 4a with pressure applied in an inner chamber; Figure 4d the breast shield according to Figure 4a with pressures applied in the inner and outer chambers; Figure 5a a schematic representation of a breast shield when applied to the mother's breast; Figure 5b the breast shield according to Figure 5a with the lid removed; Figure 6a a schematic representation of a breast shield before application to the mother's breast; Figure 6b the breast shield according to Figure 6a in the fully opened state after application to the mother's breast; Figure 6c the breast shield according to Figure 6a in the closed state after application to the mother's breast; Figure 6d the breast shield according to Figure 6a during pumping of breast milk; Figure 7a a schematic representation of a breast shield before application to the mother's breast; Figure 7b the breast shield according to Figure 7a when applying to the mother's breast; Figure 7c the breast shield according to Figure 7aafter applying to the mother's breast; Figure 7dthe breast shield according to Figure 7a during pumping of breast milk; Figure 8a a schematic representation of a breast shield before application to the mother's breast; Figure 8b the breast shield according to Figure 8a when applying to the mother's breast; Figure 8c the breast shield according to Figure 8a during the pumping of breast milk in a first situation; Figure 8d the breast shield according to Figure 8a during the pumping of breast milk in a second situation; Figure 8e a cross-section through the breast shield according to Figure 8a ; Figure 8fine perspective schematic representation of an adjustment element of the breast shield according to Figure 8a; Figure 9 a schematic representation of the forces acting on a nipple during pumping, seen from the front towards the breast; Figure 10a a perspective schematic representation of a breast pump unit with breast shield and milk collection container; Figure 10b a perspective schematic representation of part of the breast shield according to Figure 10a ; Figure 10c shows a schematic cross-section through the breast shield with milk collection container according to Figure 10a before use; Figure 10 shows a schematic cross-section through the breast pump unit according to Figure 10a before use; Figure 10ethe breast pump unit according to Figure 10d when pumping in a first position; Figure 10f the breast pump unit according to Figure 10dwhen pumping in a second position; Figure 10g shows a variant of the breast pump unit according to Figure 10d; Figure 11 shows a perspective schematic representation of a breast shield with a milk collection container; Figure 12a shows a schematic representation of a breast shield with a milk collection container and Figure 12b shows a variant of the breast shield according to Figure 12a and Figure 13 a schematic representation of a breast pump unit.

[0058] Identical or similar elements are provided with the same reference symbols. DESCRIPTION OF PREFERRED EMBODIMENTS

[0059] Figure 1shows a schematic representation of a human breast B with an average-sized nipple (WN), a small nipple (WK), and a large nipple (WG). The diameter of the nipples of different mothers ranges from approximately 10 mm to approximately 24 mm, with an average value of approximately 16 mm. The length of the nipple without external influence varies from mother to mother from approximately 3 mm to approximately 20 mm, with an average value of approximately 7 mm.

[0060] Prior art breast shells typically do not contact the nipples, allowing the variation in nipple size between mothers to be ignored. However, the areolas are preferably positioned against the nipples and are intended to stimulate them through tight contact and radial release to extract milk. Preferably, the breast shells are positioned exclusively against the nipple or only additionally against the areola, but not against the surrounding breast tissue. The breast shells described below are ideally suited for use across the entire range of nipples mentioned above, either by being offered in different sizes or, even more preferably, by adapting to the shape and size of the respective nipple through their shape and, if present, their flexible inner part.

[0061] In the Figures 2a to 2cAn embodiment of a breast shield according to the invention is shown. It comprises a rigid or semi-rigid breast shield body 1, which is preferably made of plastic. In this example, the breast shield body 1 is designed in two parts. It comprises a base 10 and a cover 11.

[0062] The cover 11 has a first vacuum connection 2 for connection to a vacuum pump. The vacuum pump has at least one vacuum unit for generating a negative pressure. The vacuum pump is in Figure 13 and will be described later in this text.

[0063] In this example, the base 10 is essentially frustoconical. It can also have a different shape, for example, it can be hollow-cylindrical. In this example, it has a mounting flange on the chest side and a pump side. A second vacuum connection 3 is provided on the base 10, which enables a connection to preferably the same pump unit or to a different pump unit of the vacuum pump.

[0064] The base 10 and the lid 11 enclose a cavity which is divided into an inner chamber 5 and an outer chamber 6 by a flexible inner part 4, also called liner.

[0065] The inner chamber 5 has an opening on the breast side through which the nipple W is inserted into the breast shield during use. On the pump side, the first vacuum connection 2 ends in the inner chamber 5 and thus connects it to the vacuum pump. The inner chamber 5 preferably has only these two openings. In other embodiments, the inner chamber 5 also has a milk connection.

[0066] The outer chamber 6 is preferably completely closed except for the second vacuum connection 3. The walls of the outer chamber 6 are preferably formed by the rigid or semi-rigid breast shield body 1 and the flexible insert element 4.

[0067] The flexible inner part 4 is slipped over the base 10 and held in place by it. It can also be molded on. It is preferably made of a soft plastic, preferably silicone. If it is a loose part, it is preferably clamped in place by the cover 11.

[0068] The flexible inner part 4 has a base body 40, a circumferential support area 41, and a circumferential fastening flange 42. The fastening flange 42 is clamped between the cover 11 and the base 10. With the support area 41, the breast shield rests tightly on or against the nipple W and / or the areola surrounding it during intended use. In this example, the support area 41 is the underside of the thickened flange, which is slipped over the base 10. This makes it soft on the breast side, but stabilized on its back by the base 10, so that the mother can exert sufficient contact pressure for a tight fit by hand or using a hands-free bra. The thickened area is designed, for example, as a circumferential hollow or solid cushion.

[0069] The base body 40 can move between these two flanges relative to the longitudinal center axis L of the breast shield, as can be seen from the Figures 2a , ab and 2c.

[0070] The base body 40 has retaining elements 43 for the nipple W. The nipple W cannot expand too much even when negative pressure is applied in the inner chamber 5, since its expansion is limited by the retaining elements 43.

[0071] The retaining elements 43 are formed by circumferential ribs which extend over at least part of the length of the base body. The ribs are preferably directed towards the breast side. However, they can also project radially inwards towards the longitudinal central axis L of the breast shield. The ribs preferably taper towards their free end. However, they can also have a different shape, e.g., rounded free ends. The ribs are preferably relatively soft so as not to irritate or even injure the nipple W. However, they are preferably stiff enough to prevent excessive extension of the nipple W during milk pumping.

[0072] In the situation according to Figure 2aThe breast shield is placed on the nipple W and seals it. No vacuum has yet been applied. The base body 40 of the flexible inner part 4 is spaced from the nipple W or lightly touches it without exerting significant pressure on it. The nipple W has its natural shape, unaffected by external forces.

[0073] In the situation according to Figure 2b A nearly constant negative pressure is applied via the first vacuum port 2 by means of the vacuum pump. It can remain constant throughout the entire subsequent pumping process or be adjusted according to the nut or a vacuum pump control, but can remain constant again for a subsequent period until the next adjustment. However, it can also change cyclically, with the cycle duration being very long, e.g., one or more minutes. Alternatively or additionally, the average value of the cycle can also change.

[0074] As in Figure 2b As can be clearly seen, the base body 40 of the flexible inner part 4 is drawn inward toward the longitudinal center axis L due to the negative pressure prevailing in the inner chamber 5. The nipple W is contacted and firmly enclosed. However, the retaining means 43 prevent the nipple W from being excessively elongated at the same time. Preferably, the possible extension of the nipple W is only a few percent, preferably less than 20%.

[0075] In the situation according to Figure 2cThe constant negative pressure in the inner chamber 5 is maintained. A pulsating negative pressure, which may also include a positive pressure component, is simultaneously applied to the outer chamber 6 via the second vacuum connection 3. Preferably, however, the applied negative pressure fluctuates between a maximum negative pressure and atmospheric pressure or even has a constantly present base vacuum. The second maximum negative pressure is preferably greater in absolute value than the first maximum negative pressure, i.e., the outer chamber 6 is evacuated more strongly than the inner chamber 5.

[0076] By applying the pulsating negative pressure in the outer chamber 6, the base body 40 of the flexible inner part 4 is pulled outward again and away from the longitudinal center axis L of the breast shield. The base body can relax again and bulges outward again. This massage effect causes the nipple W to relax again and the natural milk ducts of the nipple W to expand.

[0077] In this third situation, milk flows from the nipple W into the inner chamber 5. Depending on the design of the breast shield, an additional connection may be present, which is connected directly or via a line to a milk collection container. In this design, the milk flows through the first vacuum connection 2 to the breast pump and from there into the milk collection container. This means that the vacuum line for the constant negative pressure also serves as the milk line.

[0078] By applying constant pressure to the inner chamber 5 and pulsating pressure to the outer chamber 6, the procedure can be performed that relaxes the nipple W and preferably draws it outward, thereby opening the natural milk ducts. However, this breast shield can also be used in other procedures, e.g., by applying a pulsating, i.e., cyclically changing, negative pressure to the inner chamber 5 and, depending on the variant, applying a pulsating and / or constant pressure to the outer chamber 6. This results in a massage effect. The same applies to the breast shields described below.

[0079] In the Figures 3a and 3bA breast shield is shown. The basic structure of the breast shield is the same as in the exemplary embodiment according to the invention and is therefore not explained in detail here. The rigid or semi-rigid breast shield body 1 is again present, in which the flexible inner part 4 is arranged. The first vacuum connection leads into the inner chamber 5 and the second vacuum connection 3 into the outer chamber 6. The outer chamber 6 surrounds the outside of the flexible inner part 4. The inner wall of the base body 40 is smooth in this illustration. In other variants, it is also provided with retaining elements 43, for example with ribs. In the inner chamber 5, a constant negative pressure is preferably applied, and in the outer chamber 6, a pulsating negative pressure exceeding this negative pressure is present. This meansHere, too, a method can be used in which the extension of the nipple W is limited, and the nipple W is massaged and, if necessary, radially stretched by the negative pressure in the outer chamber 6 by means of the flexible inner part 4.

[0080] Figure 3a shows the situation in which no negative pressure or a negative pressure is applied in both chambers 5, 6. Figure 3b shows the situation when a negative pressure is applied only in the inner chamber 5 or when this pressure at least predominates in terms of amount.

[0081] In Figure 3b It can be seen how the base body 40 is drawn inwards towards the longitudinal central axis L of the breast shield, whereby the base body 40 partially or completely closes the passage formed between the breast end of the breast shield and the pump end of the breast shield. Figure 3bit is not yet completely closed. The closure 44 preferably takes place immediately in front of the free end of the nipple W, so that the closure 44 prevents it from further expanding in the longitudinal direction. The closure 44 thus forms a retaining means for the nipple W.

[0082] The inside of the base body 40 can be provided either with a smooth surface or with additional retaining means.

[0083] This embodiment preferably has at least one, preferably two sensors 7, 7'. The first sensor 7 is arranged in the extension of the nipple W, here in the cover 11, and measures along the longitudinal center axis L of the breast shield. It detects the position of the tip of the nipple W as well as the closure 44. The second

[0084] Sensor 7' is arranged radially relative to the base body 40 of the flexible inner part 4 and detects the radial movement of the base body 40. Both sensors 7, 7' are preferably optical sensors. Instead of a single second sensor 7', several sensors 7' distributed around the circumference of the breast shield can also be used.

[0085] With the help of these two sensors 7, 7', the position of the closure 40 and the change in the nipple W can be determined. These sensors 7, 7' are preferably connected to a visual and / or acoustic display and / or to a control unit of the breast pump. Based on these measurement signals, the pumping parameters, such as the pumping frequency and / or the vacuum level, can be adjusted so that the closure 44 is positioned at an optimal location for the respective size of the nipple W and can thus optimally limit the nipple W's longitudinal expansion.

[0086] In the Figures 4a to 4d A third embodiment of the breast shield according to the invention is shown. The breast shield body 1 is formed in one piece and again has the two connections 2 and 3 and the inner chamber 5 and the outer chamber 6. The flexible inner part 4 is slipped over both end surfaces of the breast shield body 1 and thus held in place. The base body 40 of the flexible inner part is essentially hollow-cylindrical in shape, with its breast-side end merging into an outwardly directed, circumferential, and self-contained arc 400. This arc 400 can have the same wall thickness as the cylindrical part of the base body 40. However, it can also be thickened. The base body 40 can be manufactured using a multi-component, particularly two-component, injection molding process.

[0087] The circumferential breast-side flange of the flexible inner part 4 is directed outward and, in turn, forms the circumferential, self-contained support area 41 for resting on the nipple W or the adjacent areola. The support area 41 is preferably thickened. It is preferably relatively soft, similar to a circumferential cushion.

[0088] The inner chamber 5 is in turn subjected to a constant vacuum, the outer chamber 6 to a pulsating, in particular a cyclically changing vacuum.

[0089] In Figure 4a The breastplate is shown in its grand state before it is placed on the chest. In Figure 4b The breast shield is placed on the nipple W and encloses it. The free end of the nipple W is accommodated in the hollow cylindrical portion of the base body 40. This portion can also have a different shape. For example, it can be truncated cone-shaped.

[0090] In Figure 4c the inner chamber 5 is subjected to constant pressure. The base body 40 of the flexible inner part is pulled towards the longitudinal central axis L of the breast shield, the arch 400 changes its shape and the base body 40 in turn forms a closure 44. This in turn restricts the nipple W in its longitudinal expansion without it being subjected to excessive external forces. If the interior of the outer chamber 6 is now provided with the pulsating vacuum, the base body 40 moves at least partially radially outwards again and at least partially releases the nipple W. The arch 400 changes its shape in the process, but preferably lies against the nipple W and surrounds it during the entire pumping process. The arch 400 is preferably designed to be so soft and flexible that it does not create any pressure points on the nipple W. This means that the flow of milk is not impeded.

[0091] The movement of the arch 400 on the nipple W and / or areola leads to massage and stimulation of the nipple W and thus to increased milk ejection. The constant application of the arch 400 can be ensured, for example, by maintaining a higher level of constant vacuum applied than the level of pulsating vacuum throughout the entire cycle.

[0092] The embodiment according to the Figures 5a and 5bis particularly ideal for mothers with very low milk production, especially mothers with premature babies. Here, too, the parts already explained above are not described in detail. The applied pressures are preferably as described above. In addition to the arch 400, which preferably always rests against the nipple W, there is a pocket 46 for collecting individual drops of milk. The pocket 46 is preferably designed to surround the breast shell so that it has no influence on the rotational position of the breast shell on the nipple W. Expressed milk that is not sucked out through the milk duct, or depending on the embodiment, through the first vacuum connection 2, is collected in this pocket 46. When the breast shell is removed from the nipple W after pumping, this additional milk is held in the pocket 46 and can also be collected and used.In this way, not a drop of precious breast milk is lost.

[0093] The Figures 6a to 6d show a further embodiment of the breast shield according to the invention, which is preferably operated with a constant internal pressure and a pulsating external pressure.

[0094] In In this embodiment, the flexible inner part 4 is slipped at its pump-side end over a connecting piece 12, which forms the first vacuum connection 2. Here, too, the base body 40 transitions into a curve on the breast side, which forms a contact area 45. This contact area 45 preferably contacts the nipple W during the entire pumping process, with the contact area 45 preferably resting against the nipple W over its entire circumference, as in the previous example.

[0095] In Figure 6aThe breast shield is shown in its basic state. The inner diameter of the base body 40 is preferably equal to or smaller than the diameter of a smallest or potential nipple W.

[0096] In Figure 6b The breast shield is placed on the nipple W, with a constant negative pressure being applied in the outer chamber 6, but not in the inner chamber 5. As a result, the base body 40 of the flexible inner part 4 has moved radially outward. The inner chamber 5, which accommodates the nipple W, has reached its maximum volume. The breast shield can then be easily slipped over the nipple W. This is particularly advantageous for sensitive or inflamed nipples W.

[0097] Then, as in Figure 6cAs shown, a negative pressure is generated in the inner chamber 5 and preferably the absolute value of the negative pressure in the outer chamber 6 is reduced, set to atmospheric pressure, or even raised to a positive pressure. As a result, the base body 40 is drawn toward the longitudinal center axis L of the breast shield and toward the nipple W. The support area 45 surrounds the nipple W and rests against it over its entire circumference. The closure 44 is formed in the end area of the nipple W. The effective pumping process can now begin.

[0098] This is in Figure 6d shown. A constant vacuum is applied to the inner chamber 5 via the first connection 2, and a pulsating, preferably higher-pressure vacuum is applied via connection 3.

[0099] During the pumping process, the shape of the flexible inner part 4 changes from the shape according to Figure 6d to the form according to Figure 6c and back. At Figure 6dis pumped, at Figure 6c is massaged and stimulated.

[0100] The breast shield can be removed easily and painlessly after the pumping process has been completed, if the situation is again adjusted according to the pressure applied. Figure 6b is brought about.

[0101] This embodiment has the further advantage that the flexible inner part 4 has no hulls or folds and that the flexible inner part 4 can be brought into the optimal fit with respect to the individual nipple W merely by changing the pressure when placing the breast shield on the mother's breast.

[0102] The embodiment according to the Figures 7a to 7ddiffers from the above essentially in that, in addition to the outer chamber 6, a further circumferential outer closed cavity 410 is formed, which can also be pressurized. Accordingly, two second connections 3, 30 are provided. This is achieved in this embodiment in that the flexible inner part 4 has a circumferential partition 47, which divides the area between the rigid or semi-rigid breast shield body 1 and the flexible inner part 4 into two areas.

[0103] Preferably, this partition wall 47 is designed such that it is or can be connected over its entire circumference to a corresponding projecting or recessed counterpart of the inner wall of the breast shield body 1.

[0104] The outer chamber 6, located farther from the chest, is used to move the base body 40 of the flexible inner part 4, analogous to the examples already described above. The inflatable cavity 410, located near the chest, forms a circumferential inflatable cushion for the support area 41.

[0105] In Figure 7a The breast shield is shown in its basic state. The inner diameter of the breast-receiving area of the flexible inner part 4 is preferably equal to or larger than the diameter of a nipple W.

[0106] In Figure 7b It is placed on the nipple W. A constant positive pressure is applied to the cavity 410 near the breast via the second connection 30, so that the cavity 410 expands and forms an inflated, circumferential cushion that rests against the nipple W and / or the areola. The nipple W is thereby received in the flexible inner part 4, whereby it is slightly compressed.

[0107] According to Figure 7b The overpressure in the cushion, ie, in the cavity 410, is now reduced. Preferably, atmospheric pressure or a negative pressure is generated in this cavity 410. The nipple W can thus relax again and shorten in length. However, it is still held in the flexible inner part 4 such that the inner part contacts the nipple W over its entire circumference.

[0108] The pumping process then begins, which Figure 7d A constant negative pressure is generated via the first vacuum port 2 in the inner chamber 5. A pulsating negative pressure is generated via the second vacuum port 3 in the outer chamber 6, which is close to the pump and thus far from the breast. This, in turn, leads to the massage and stimulation of the nipple W and to milk ejection.

[0109] In the Figures 8a to 8f Another embodiment of a breast shield according to the invention is shown. This simulates the conditions in an infant's mouth.

[0110] The rigid or semi-rigid breast shield body is again designated by reference numeral 1. It has a first vacuum port 2 for applying a constant pressure, in particular a vacuum, to an inner chamber 5. A second vacuum port 3 for applying a pulsating negative pressure leads to an outer chamber 6. The nipple W is accommodated in the inner chamber 5, as in the embodiments described above.

[0111] A flexible inner part 8 is arranged in the breast shield body 1, which is no longer formed in one piece, as in the previous examples. Rather, it has an upper part 80, 81, 82, which imitates the palate of the infant, and a lower part 84, which imitates the infant's tongue and thus forms a tongue part. Both parts 80, 81, 82, 84 are preferably firmly connected to the breast shield body 1, while being movable relative thereto in order to change the size of the inner and outer chambers 5, 6. The lower part 84, together with an adjacent region of the breast shield body 1, delimits the outer chamber 6. The upper part 80, 81, 82, together with an adjacent region of the breast shield body 1 and the lower part 84, delimits the inner chamber 5.

[0112] The upper part has a frontal surface 82 directed toward the breast, which serves as a support area for sealing against the nipple W or the areola. The lower part 84 has a corresponding counterpart, which bears the reference numeral 41 as the support area.

[0113] The upper region 80, 81, 82 can consist of regions of different hardness by selecting the materials accordingly. It can be formed in one or more pieces. In this example, it is formed in two pieces, with the support region 82 closest to the chest and the adjacent first region 81 being harder than the second region 80 furthest from the chest. The second region 80 forms the posterior palate part, and the first region 81 the anterior palate part. The posterior palate part 80 is correspondingly curved downwards and, depending on its position, delimits or closes the inner chamber 5 toward the first vacuum connection 2. The anterior and posterior palate parts 81, 80 are adjacent to one another and are connected to one another.

[0114] In the upper area between the breast shield body 1 and the two palate parts 80, 81, an adjustment element 83 is held so as to be movable in the longitudinal direction of the breast shield. Using this adjustment element 83, the hardness of the palate can be varied by changing its position relative to the two palate parts 80, 81. Figure 8a In the area far from the breast, it is located exclusively over the softer posterior palate 80 and influences the behavior of the breast shield during the pumping process. In the other figures, the adjustment part 83 is moved closer to the breast and also covers part of the anterior palate 81. The covered area is thus stiffened and its movement is restricted. The behavior of the flexible inner part 8 during the pumping process is influenced. The vertically downward-pointing arrows in the Figures 8a to 8e show the position of the adjusting element 83.

[0115] In Figure 8fA possible embodiment of such an adjustment element 83 is shown. It is a partial section of a rigid hollow cylinder. Other shapes are possible. Furthermore, the adjustment part 83 can be moved into the appropriate position by other types of movement instead of displacement. Instead of a mechanical adjustment element 83, the palate parts can also be hollow, and their rigidity can be varied by applying excess pressure.

[0116] In Figure 8a The breast shield is shown in its basic state when not in use. Figure 8b The breast shield is placed over the nipple W so that the nipple W is held between the two palate parts 80, 81 and the tongue part 84. According to Figure 8c A constant negative pressure is then applied to the inner chamber 5 and a pulsating negative pressure is applied under the tension part 84, ie in the outer chamber 6.

[0117] The nipple W is massaged and stimulated similarly to the way it is massaged in an infant's mouth, whereby the longitudinal expansion of the nipple W toward the second vacuum port 2 also occurs, but is limited. The limitation is essentially achieved by the downwardly curved shape of the posterior palate 80. The milk flowing from the nipple W is shown in the figures with dots and an arrow. This embodiment, like those already described, can be combined with one or more of the sensors 7, 7' described above for detecting the nipple W and the occlusion.

[0118] In Figure 9 A variant of the pressure application is shown. This involves a breast shield in which the negative pressure in the outer chamber 6 is applied in such a way that it rotates 360° in time. In the situation according to Figure 9The pressure of the flexible inner part 4 is currently acting from below on the nipple W. This is illustrated by the straight arrow shown in solid lines. The dashed arrows show that the pressure acting on the nipple W rotates around the longitudinal central axis L of the breast shield, thus resulting in a rotating massage and stimulation of the nipple W. This can be easily achieved by appropriate design, e.g., by subdividing the outer chamber 6.

[0119] In the Figures 10a to 10e A breast pump unit according to the invention is shown. It has, as shown in Figure 10aAs can be clearly seen, it comprises a rigid base body, a flexible breast shield 4', and a milk collection container 9. The breast shield 4' and the milk collection container 9 are formed as a single piece and together form a flexible element. The flexible element is made of a soft material, for example, silicone. The wall thickness of the flexible element is relatively thin; preferably, it is membrane- or film-like.

[0120] The flexible element forms a bag with an opening whose shape is suitable for fitting tightly and without forming folds on the mother's breast. The opening is preferably round, elliptical or oval. The edge of the opening is preferably reinforced, e.g. with an interlining cord or by a thickened formation. This reinforced edge forms the support area 41 of the breast shield 4', which fits tightly against the breast during use. The front part, the area of the bag closest to the breast, thus forms the breast shield 4' with the flexible base body 40 and the support area 41. The rear area, far from the breast, forms the milk collection container 9. At least one, preferably several pockets 49 are formed in the central area of the flexible element. A rigid or elastic ring 90 is preferably present, which encloses the ends of the pockets 49 far from the breast.

[0121] In Figure 10aThe base body 1' is clearly visible. It is ring-shaped and has a central through-opening 14. Distributed around this central through-opening 14 are several spring tongues 15 in the form of leaf springs, the free ends of which are directed towards the central through-opening 14 and which pass through the central through-opening 14. The spring tongues 15 are fastened to the base body by bolts 18. In the area near the bolts, the spring tongues 15 are supported by means of spiral springs 16 on the inner wall of the base body remote from the chest. This is shown in Figure 10e clearly visible. On each spring tongue 15, a line 17 or cord is also attached, which also passes through the central through-opening 14 or, as shown here, through a separate opening 14' (see Figure 10d ) is carried out. There may be a separate opening 14' for each line 17. These lines 17 and separate openings 14' are in the Figure 10a not shown.

[0122] The spiral springs 16 can be arranged between the lines 17 and the bolts 18, as shown in the Figures 10d to 10f However, it is also possible to arrange the lines 17 between the bolts 18 and the spiral springs 16, as shown in Figure 10g is the case.

[0123] The assembly of this breast pump unit according to the invention and its mode of operation can be explained by means of the Figures 10c to 10f explain well. In the Figure 10cThe one-piece flexible element is shown, which forms the breast shield 4' with the milk collection bag 9. In practice, it is not used on its own or placed on the breast. However, the figure facilitates understanding of the invention. The breast shield preferably surrounds not only the nipple W but also the surrounding breast tissue B. It preferably lies sealingly on the breast tissue B. The flexible element is placed on the nipple W such that the pockets 49 are located in the area of the nipple. Preferably, they project beyond the end of the nipple W.

[0124] In Figure 10dThe entire breast shield unit can now be seen as it is placed on the nipple W in practice. The flexible element passes through the base body 1', with the spring tongues 15 being pushed into the pockets 49 of the flexible element and held therein. The lines 17 are shown in abbreviated form. They usually end together in a pulling device (not shown here), which is preferably manually operated. The pulling device is, for example, a button or rod to which all lines 17 are attached and which can be held in the hand. Alternatively, it can be designed, for example, in the form of a slider, part of a housing (also not shown here).

[0125] In the position according to Figure 10dThe nipple W is enclosed by the spring tongues 15 and lightly compressed. Since the spring tongues 15 lean toward each other toward the free end of the nipple W, the longitudinal expansion of the nipple W is limited. In this initial state, before the milk is pumped out, the milk collection container 9 is compressed. There is no air in the milk collection container 9. The area in front of the nipple W, formed by the spring tongues 15, is the inner chamber 5.

[0126] In Figure 10ethe pumping process has begun. By pulling on the lines 17, the spring tongues 15 can be raised against the force of the coil springs 16. The nipple W is released in its circumference and can expand and relax. Milk therefore flows from the nipple W into the inner chamber 5. The milk is shown in the figures with dots and is provided with the reference symbol M. By reducing the tension on the lines 17, the spring tongues 15 are lowered again and massage the nipple W. This also presses the extracted milk M into the milk collection container 9. By repeatedly tensing and releasing the lines 17, i.e. by repeatedly raising and lowering the spring tongues 15, the nipple W is massaged and stimulated. When released, the natural milk ducts expand and milk can be extracted optimally and without an external suction source.

[0127] The milk collection container 9 can be supplied as an empty tube from the manufacturer. Figure 10g A possibility is shown how to ensure that the milk collection container 9 is empty of air before use. The base body is provided with a lid 11, which on the one hand receives the lines 17. On the other hand, a pressing lever 19 is movable therein. The pressing lever 19 is connected via a hinge 190 to an extension 111 of the base body. The extension 111 as well as the

[0128] Press levers 19 together form a receptacle for the milk collection container 9. If the press lever 19 is now pressed toward the extension 111, the milk collection container 9 is compressed and any remaining air is expelled via the breast shield 4'. During the extraction of the breast milk, the press lever 19 is subsequently released again.

[0129] In Figure 11A further embodiment of the breast shield according to the invention is shown. One of the breast shields described above or a breast shield of a known type can be used for this purpose. The breast shield body 1 is shown only schematically here. It can have a different shape and size. In particular, like the known classic breast shields, it can also accommodate a larger area of breast tissue.

[0130] According to the invention, the breast shield is provided with air outlet openings 110 through which air actively flows toward the breast. This means that the breast is blown through the breast shield. For example, an exhaust from the breast pump unit can be used as a corresponding fan, or the fan can be a blower or ventilator arranged on or in the breast shield body. Other fan designs for generating an airflow are possible.

[0131] In Figure 11In purely schematic form, an attachment 100 is placed on the breast shield body 1, wherein the attachment 100 has air outlet openings 110 for supplying air to the mother's breast. Preferably, the air outlet openings are located only in a portion of the circumference of the breast shield to simulate the infant's nose.

[0132] In the Figures 12a and 12b A further embodiment of the breast shield according to the invention is shown in two variants. It again comprises a breast shield body 1 and a flexible inner part 4 with a support area 41. The breast shield again surrounds the nipple W and the areola at most. The nipple W is tightly enclosed by the base body 40 of the flexible inner part 4.

[0133] In the embodiment according to Figure 12aA constant or nearly constant vacuum is applied to the inner chamber 5, into which the milk flows, via the first vacuum port 2. A pulsating vacuum is applied to the outer chamber 6, which surrounds the nipple W, via the second vacuum port 3. The nipple W is massaged, and the natural milk ducts open and close during the pumping process.

[0134] In the embodiment according to Figure 12b A pulsating vacuum is applied via the first vacuum connection 2 and a temporally constant or nearly constant vacuum is applied via the second vacuum connection 3. In this way, the natural milk ducts are kept open during the entire pumping process, since the nipple W is pulled radially outwards due to the negative pressure in the outer chamber 6. The base body 40 of the inner part 4 in the embodiment according to Figure 12b has one or more interruptions 40'.

[0135] In both embodiments according to the Figures 12a and 12b the nipple W is enclosed in a ring-like manner by the base body 40 of the flexible inner part, which tightly encloses the nipple W like the mouth of an infant.

[0136] In Figure 13 A breast pump unit is shown schematically, as it is, with the exception of the embodiment according to the Figures 10a to 10g can be used with the aforementioned breast shields. It comprises the breast shield, here with the breast shield body 1. The first vacuum connection 2 of the breast shield body 1 is connected to a vacuum pump 200 via a first vacuum line 21. The vacuum pump 200 can have one or more pump units and a control unit 201. If sensors are present in the breast shield, the control unit receives the data from the sensors and controls the at least one pump unit accordingly.

[0137] The second vacuum connection 3 is also connected to the vacuum pump 200 via a second vacuum line 31. A milk line 91 leads from the vacuum pump to the milk collection container 9. As explained above, with all the breast shields described, with the exception of the embodiment according to the Figures 10a to 10g , either a separate milk connection from the inner chamber 5 directly or via a pipe to a milk collection container. However, it is also possible, as shown here, to use the first vacuum connection 2 as a milk connection and to feed the milk through the first

[0138] Vacuum line to the breast pump or an upstream chamber and from there directly or via a milk line 91 into the milk collection container 9. Alternative routes for the extracted milk are also possible.

[0139] The inventive concepts are not limited to the embodiments described above. These should be viewed purely schematically in order to understand the basic principles of the invention. These basic principles can also be implemented using other mechanical means. Most of the breast shells presented here fit snugly around the nipple over their entire circumference and, thanks to the selected pressure application, can be actively collapsed at a well-defined point. This prevents longitudinal expansion of the nipple. However, radial expansion of the nipple is encouraged. In virtually all of the breast shells presented here, nipple stimulation occurs mechanically through friction and thrust forces. The milk ducts are kept open for as long as possible. The breast shells themselves can be made relatively small, so they can also be used as free-hand solutions.They also do not irritate the breast as they only cover the nipple and at most the areola.

[0140] The method according to the invention, the breast pump units according to the invention and the breast shields according to the invention enable a maximized pumping performance and a minimized pumping time per pumping session. LIST OF REFERENCE SYMBOLS 1 Breast shield body 41 Support area 1' Basic body 410 cavity 10 base 42 Mounting flange 100 Essay 43 Retaining element 110 Air outlet openings 44 closure 111 extension 440 bow 11 Lid 45 Contact area 12 connecting piece 46 Bag 14 passage opening 47 partition 14' separate opening 49 Recording pocket 15 spring tongue 16 spiral spring 5 inner chamber 17 leash 18 bolt 6 outer chamber 19 Press lever 190 hinge 7 first sensor 7' second sensor 2 first vacuum connection 21 first vacuum line 8 flexible inner part 200 vacuum pump 80 posterior palate 201 Control unit 81 anterior palate 82 Support area 3 second vacuum connection 83 Adjustment element 30 third vacuum connection 84 tongue part 31 second vacuum line 9 Milk collection container 4 flexible inner part 90 ring 4' Breast shield 91 Milk line 40 Basic body 40' Interruption B Breast 400 bow M Milk W nipple shared apartment large nipple WN average nipple L Longitudinal center axis WK small nipple

Claims

1. Breast shield of a breast pump unit for expressing human breast milk, wherein the breast pump unit comprises a vacuum pump (200) for generating pressures, wherein the breast shield comprises a support area (41) for sealingly supporting it on the human breast and an inner chamber (5) with a receiving area for receiving a nipple (W) of the breast, wherein the inner chamber (5) is conically shaped over an entire receiving area, characterized in that the inner chamber (5) has an inner wall (40) which is equipped with retaining elements (43) designed as circumferential ribs for retaining the nipple (W) during the pumping process.

2. Breast shield according to claim 1, wherein the breast shield has at least one outer chamber (6) which at least partially surrounds the nipple (W), wherein the inner chamber (5) is designed to receive an approximately constant first pressure from a vacuum pump (200) and the at least one outer chamber (6) is designed to receive at least one pulsating second pressure from the vacuum pump (200).

3. Breast shield according to claim 2, wherein the breast shield has a flexible inner part (4) which divides the breast shield into the inner chamber (5) and the at least one outer chamber (6), and wherein the flexible inner part (4) can be pressurized from the inside with the first pressure and from the outside with the at least one second pressure.

4. Breast shield according to one of the preceding claims, wherein the ribs are turned toward the breast side or extend radially inward toward a longitudinal center axis (L) of the breast shield.

5. Breast shield according to one of the preceding claims, wherein the ribs taper toward their free ends or have rounded free ends.