Breast shield

1. A method for operating a breastpump unit for expression of human breastmilk, wherein the breastpump unit has a vacuum pump for generating pressures and at least one breast shield for sealing application to a breast to be pumped,

wherein the breast shield has an inner chamber for receiving a nipple (W) of the breast and also at least one outer chamber for partially surrounding the nipple (W), wherein a first pressure is applied to the inner chamber by the vacuum pump and at least one second pressure is applied to the at least one outer chamber by the vacuum pump, wherein

a) a substantially constant pressure is used throughout a pumping session as the first pressure and a pulsating pressure is used as the at least one second pressure, or wherein

b) a pulsating pressure is used as the first pressure and a substantially constant pressure is used throughout the pumping session as the at least one second pressure, and

wherein at least one sensor determines the position of the nipple during the pumping operation,

wherein a controller varies the first pressure and the at least one second pressure in accordance with the position of the nipple determined by the at least one sensor.

2. The method as claimed in claim 1 , wherein the breast shield has a flexible inner part which subdivides the breast shield into the inner chamber and the at least one outer chamber, and wherein the flexible inner part is subjected to the first pressure from the inside and to the at least one second pressure from the outside.

3. The method as claimed in claim 2 , wherein, in order to position the breast shield on the breast, the first pressure is applied in the inner chamber in a first step, in order that the flexible inner part is pulled inward into contact with the nipple (W), and wherein the at least one second pressure is applied in a further step.

4. The method as claimed in claim 2 , wherein, in order to position the breast shield on the breast, at least one third pressure is applied in the at least one outer chamber in a first step, wherein the third pressure is substantially constant throughout the pumping session, wherein the third pressure pulls the flexible inner part outward in order to form an interior space within the flexible inner part for the purpose of receiving the nipple (W), wherein the first and the at least one second pressure are applied in a further step in order to express milk.

5. The method as claimed in claim 1 , wherein a negative pressure is used as the first pressure and a negative pressure and a positive pressure is used as the at least one second pressure.

6. The method as claimed in claim 1 , wherein the first pressure and the at least one second pressure are used independently of one another.

7. The method as claimed in claim 1 , wherein the first pressure and the at least one second pressure are applied in dependence on one another as stipulated by a control unit.

8. The method as claimed in claim 1 , wherein there are at least two second chambers, which each have a second pressure applied to them independently of one another, wherein the ratio of the at least two second pressures relative to one another is varied over time.

9. The method as claimed in claim 1 , wherein the first pressure and the at least one second pressure are applied at such a strength in the first and the at least one second chamber that the nipple (W) of the breast remains substantially unchanged in terms of length.

10. The method as claimed in claim 1 , wherein a negative pressure is used as the first pressure and a negative pressure is used as the at least one second pressure.

11. The method as claimed in claim 1 , wherein a negative pressure is used as the first pressure and a positive pressure is used as the at least one second pressure.

12. A method for operating a breastpump unit for expression of human breastmilk, wherein the breastpump unit has a vacuum pump for generating pressures and at least one breast shield for sealing application to a breast to be pumped, wherein the breast shield has a flexible inner part having an inner chamber for receiving a nipple (W) of the breast and at least one outer chamber which at least partially surrounds the nipple (W), wherein a first pressure is applied to the inner chamber by the vacuum pump and at least one second pressure is applied to the at least one outer chamber by the vacuum pump, the method including pressurizing the flexible inner part such that the latter fits on the nipple (W) in an annular manner in a first position and such that it frees the nipple (W) in the radial direction in a second position, wherein the first pressure pulsates and the at least one second pressure is substantially constant throughout a pumping session, wherein the breast shield has a flexible inner part which subdivides the breast shield into the inner chamber and the at least one outer chamber, and wherein the flexible inner part is subjected to the first pressure from the inside and to the at least one second pressure from the outside.

13. A breastpump unit for expression of human breastmilk, wherein the breastpump unit has a vacuum pump for generating pressures and at least one breast shield for sealing application to a breast to be pumped, wherein the breast shield has an inner chamber for receiving a nipple (W) of the breast and also at least one outer chamber which at least partially surrounds the nipple (W), wherein the inner chamber is configured to be subjected to a first pressure by the vacuum pump and the at least one outer chamber is configured to be subjected to at least one second pressure by the vacuum pump, wherein the first pressure is a substantially constant pressure throughout a pumping session and the at least one second pressure is a pulsating pressure, wherein at least one sensor is provided to determine the position of the nipple during the pumping operation, and wherein a controller is provided which is configured to vary the first pressure and the at least one second pressure in accordance with the determined position of the nipple.

14. The breastpump unit as claimed in claim 13 , wherein the breast shield has a flexible inner part which subdivides the breast shield into the inner chamber and the at least one outer chamber, and wherein the flexible inner part is able to be subjected to the first pressure from the inside and to the at least one second pressure from the outside.

15. The breastpump unit as claimed in claim 13 , wherein the breast shield has an outer breast shield body and a flexible inner part, wherein the flexible inner part

forms an application region for sealing application to the human breast, and

subdivides the breast shield into the inner chamber for receiving a nipple (W) of the breast and into the at least one outer chamber which at least partially surrounds the nipple (W),

wherein the flexible inner part is configured in one piece and the breast shield has a further chamber in the form of a cavity which is subdivided by the at least one outer chamber,

wherein a fixed or releasable connection between the flexible inner part and the breast shield body forms an encircling partition wall, and wherein the additional chamber is arranged in the application region of the breast shield.

16. The breastpump unit as claimed in claim 13 , wherein at least one sensor is provided to determine the position of the nipple during the pumping operation, and wherein a controller is provided which is configured to vary the first pressure in accordance with this determined position of the nipple (W).

17. The breastpump unit as claimed in claim 13 , wherein at least one sensor is provided to determine the position of the nipple during the pumping operation, and wherein a controller is provided which is configured to vary the at least one second pressure in accordance with this determined position of the nipple (W).

18. A breast shield of a breastpump unit for expression of human breastmilk, wherein the breastpump unit has a vacuum pump ( 200 ) for generating pressures, wherein the breast shield has:

an application region for sealing application to the human breast,

an inner chamber for receiving a nipple (W) of the breast, and

at least one outer chamber which at least partially surrounds the nipple (W), wherein the inner chamber is configured to be subjected to a first pressure by the vacuum pump and the at least one outer chamber is configured to be subjected to at least one second pressure by the vacuum pump, wherein the first pressure is a pulsating pressure and the at least one second pressure is a substantially constant pressure throughout a pumping session, wherein the breast shield has a flexible inner part which subdivides the breast shield into the inner chamber and the at least one outer chamber, and wherein the flexible inner part is subjected to the first pressure from the inside and to the at least one second pressure from the outside.

19. The breast shield as claimed in claim 18 , wherein the breast shield has a flexible inner part which subdivides the breast shield into the inner chamber and the at least one outer chamber, and wherein the flexible inner part is able to be subjected to the first pressure from the inside and to the at least one second pressure from the outside.

20. The breast shield as claimed in claim 19 , wherein the flexible inner part is a flexible insert which is connected fixedly or releasably to a rigid or semirigid breast shield body.