Neck hanging type breast pump

By adopting a double-sided independent air pump and solenoid valve design in the halter-type breast pump, the problem of uneven suction on both sides of the breast pump in the prior art is solved, and a more uniform suction distribution and more efficient breast pumping effect are achieved, which improves the mother's comfort and convenience of movement.

CN223126972UActive Publication Date: 2025-07-22JIANGSU XINBEI ELECTRIC CO LTD
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Patent Information

Application Number
CN202421462118.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-25
Publication Date
2025-07-22
Estimated Expiration
2034-06-25

AI Technical Summary

Technical Problem

The existing halter-type breast pump has poor breast pumping effect due to different suction forces on both sides, which affects the mother's comfort and breast pumping efficiency.

Method used

The double-sided independent air pump and solenoid valve design ensures uniform suction force of the breast pump guard on each side through closed pipe communication. Combined with the removable breast pump guard structure, it reduces weight and volume and provides more uniform suction force and comfort.

Benefits of technology

The suction force on both sides of the halter-type breast pump is achieved evenly, improving the breast pumping effect and mother's comfort in using it, and facilitating movement.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a neck hanging type breast pump, which relates to the field of breast pumps and comprises a breast pump main machine and two breast pump protective covers. The breast pump main machine comprises an air pump, an electromagnetic valve and a neck hanging structure. The two ends of the neck hanging structure are provided with a first containing shell part and a second containing shell part respectively. A first air vent is formed in the first containing shell part; a second air vent is formed in the second containing shell part; an air pump is arranged in the first containing shell part; an electromagnetic valve is arranged in the first containing shell part; an air inlet of the electromagnetic valve in the first containing shell part is hermetically communicated with an air pump in the first containing shell part through a pipeline; according to the neck-hanging type breast pump, the problems that in the prior art, the suction force of the two sides of a neck-hanging type breast pump is different, and the breast pumping effect is poor are solved, and the breast pumping effect of the neck-hanging type breast pump can be improved.
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Description

Technical Field

[0001] The utility model relates to the field of breast pumps, specifically a neck - hanging breast pump. Background Art

[0002] A breast pump is a tool used to extract breast milk accumulated in the mammary glands and is a commonly used tool for lactating mothers.

[0003] There are many types of breast pumps. To facilitate milk extraction for mothers, there are breast pumps in the prior art that free the mother's hands. This type of breast pump is called a hands - free breast pump. Due to the built - in pump body structure, the entire weight of the breast pump will be borne by the breast, and it has a large volume. It is very difficult for a bra to fasten this breast pump. When the large - volume breast pump is placed inside the bra, the mother cannot move normally during milk extraction.

[0004] To solve the above problems, in the prior art, such as a breast pump main body and a breast pump disclosed in Chinese Patent Application No. 202311361803.5, by setting a neck - hanging structure and placing structures such as an air pump and a battery inside the neck - hanging structure, the breast pump structure inside the bra only needs a three - way joint and a milk bottle structure, thereby reducing the volume and weight of the breast pump structure inside the bra, and thus facilitating the mother's movement during milk extraction.

[0005] However, in the breast pump in the above - mentioned comparative document, the air pump is set in the accommodating shell part on one side of the neck - hanging structure, and the pipeline routed through the neck - hanging structure is connected to the other accommodating shell part. This way of connecting the pipeline will cause different suction forces provided at the two accommodating shell parts. The ventilation port on one side is far from the air pump, and the increase in the pipeline length will lead to a decrease in the suction stroke and suction force provided to the breast pump shield, thereby affecting the milk extraction effect. Summary of the Utility Model

[0006] In view of the above - mentioned technical problems, the neck - hanging breast pump provided by the utility model can improve the milk extraction effect of the neck - hanging breast pump.

[0007] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0008] The neck-mounted breast pump provided by the present utility model includes a breast pump main body and two breast pump shields; the breast pump main body includes an air pump, a solenoid valve, and a neck-mounted structure; both ends of the neck-mounted structure are respectively provided with a first containment shell part and a second containment shell part; a first ventilation port is provided on the first containment shell part; a second ventilation port is provided on the second containment shell part; one of the air pumps is provided in the first containment shell part; one of the solenoid valves is provided in the first containment shell part; the intake port of the solenoid valve in the first containment shell part is hermetically connected to the air pump in the first containment shell part through a pipeline; the first ventilation port is hermetically connected to the outlet port of the solenoid valve in the first containment shell part; one of the air pumps is provided in the second containment shell part; one of the solenoid valves is provided in the second containment shell part; the intake port of the solenoid valve in the second containment shell part is hermetically connected to the air pump in the second containment shell part through a pipeline; the second ventilation port is hermetically connected to the outlet port of the solenoid valve in the second containment shell part; one of the breast pump shields is connected through a pipeline to the first ventilation port; one of the breast pump shields is connected through a pipeline to the second ventilation port.

[0009] The neck-mounted breast pump provided by the present utility model, preferably, the breast pump main body further includes a control board and a battery; the control board is arranged in the first containment shell part; one of the batteries is arranged in the first containment shell part; one of the batteries is arranged in the second containment shell part; the battery in the first containment shell part and the battery in the second containment shell part are both electrically connected to the control board; the air pump in the first containment shell part and the air pump in the second containment shell part are both electrically connected to the control board; the solenoid valve in the first containment shell part and the solenoid valve in the second containment shell part are both electrically connected to the control board.

[0010] The neck-mounted breast pump provided by the present utility model, preferably, both ends of the neck-mounted structure are respectively fixedly connected to the first containment shell part and the second containment shell part to form a C shape in combination; the outer shell parts of the neck-mounted structure are respectively fixedly connected to the outer shell part of the first containment shell part and the outer shell part of the second containment shell part; skin-friendly layers are arranged on the inner side of the neck-mounted structure, the inner side of the first containment shell part, and the inner side of the second containment shell part; a flexible abutting layer is arranged on the inner side of the neck-mounted structure.

[0011] The neck-mounted breast pump provided by the present utility model, preferably, the breast pump shield is detachably connected to the first ventilation port through a pipeline; the breast pump shield is detachably connected to the second ventilation port through a pipeline.

[0012] The neck-mounted breast pump provided by the present utility model preferably includes a funnel-shaped base, a three-way joint, and a hood-shaped outer shell for the breast pump; the outer shell is detachably fixed to the base; when the outer shell is fixed to the base, the small opening of the funnel of the base faces the inner cavity of the outer shell; the large opening of the funnel of the base is tightly and hermetically attached to the hood-shaped opening of the outer shell; the three-way joint is arranged in the space formed by the outer shell and the base; the three-way joint includes a milk inlet, a negative pressure port, and a milk outlet; the small opening of the funnel of the base is hermetically connected to the milk inlet of the three-way joint; ventilation holes are provided on the outer shell; the ventilation holes are hermetically connected to the negative pressure port; a flexible membrane is provided between the ventilation holes and the negative pressure port for isolation; a duckbill valve inlet is connected to the milk outlet; the outlet of the duckbill valve is located inside the inner cavity of the outer shell.

[0013] The above technical solution has the following advantages or beneficial effects:

[0014] The present utility model provides a neck-mounted breast pump, which relates to the field of breast pumps and includes a breast pump main body and two breast pump shields; the breast pump main body includes an air pump, a solenoid valve, and a neck-mounted structure; both ends of the neck-mounted structure are respectively provided with a first housing part and a second housing part; a first ventilation port is provided on the first housing part; a second ventilation port is provided on the second housing part; one of the air pumps is arranged in the first housing part; one of the solenoid valves is arranged in the first housing part; the air inlet of the solenoid valve in the first housing part is hermetically connected to the air pump in the first housing part through a pipeline; the first ventilation port is hermetically connected to the air outlet of the solenoid valve in the first housing part; one of the air pumps is arranged in the second housing part; one of the solenoid valves is arranged in the second housing part; the air inlet of the solenoid valve in the second housing part is hermetically connected to the air pump in the second housing part through a pipeline; the second ventilation port is hermetically connected to the air outlet of the solenoid valve in the second housing part; one of the breast pump shields is connected through a pipeline to the first ventilation port; one of the breast pump shields is connected through a pipeline to the second ventilation port. The neck-mounted breast pump provided by the present utility model solves the problem in the prior art that the suction forces on both sides of the neck-mounted breast pump are different and the milk suction effect is poor, and can improve the milk suction effect of the neck-mounted breast pump. Description of the Drawings

[0015] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, the present utility model and its features, shape, and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale, and the emphasis is on showing the gist of the present utility model.

[0016] Figure 1 It is a schematic diagram of the overall structure of the neck-mounted breast pump provided in Embodiment 1 of the present utility model.

[0017] Figure 2 It is a schematic structural diagram of a partial structure of a hidden second accommodating shell part of a neck-hanging breast pump provided in Embodiment 1 of the present utility model and after hiding the outer shell of a breast pump main body.

[0018] Figure 3 It is a schematic internal structural diagram of a first accommodating shell part of a neck-hanging breast pump provided in Embodiment 1 of the present utility model.

[0019] Figure 4 It is a schematic connection diagram of circuit wire frames of internal components of a neck-hanging breast pump provided in Embodiment 1 of the present utility model. Specific embodiments

[0020] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application may be combined with each other. It should be noted that the terms used in the present utility model are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0021] The following describes the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Therefore, the detailed descriptions of the embodiments of the present utility model provided in the following drawings are not intended to limit the scope of the present utility model to be protected, but only represent the selected embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0022] Embodiment 1:

[0023] The neck-hanging breast pump is a breast pump that hangs the main body of the breast pump around the neck in a neck-hanging form. However, the existing neck-hanging breast pumps all follow the structure of the original traditional double-sided breast pump, that is, through a single air pump, cyclically providing suction to two breast shields (such as a double-sided breast pump main body disclosed in Chinese Patent Application No. 202321029084.2, which has two air intake ports, and the opening and closing of the two air intake ports are respectively controlled by a solenoid valve, and there is only one air pump for providing suction). Since the path lengths from the two air intake ports of the breast pump main body in the prior art to the air pump are the same, when the pipelines are of equal length when connecting the breast shields to the two air intake ports of the breast pump main body in the prior art, the suction forces received by the mother's two breasts wearing the breast shields are the same. However, in the background art comparative document (a breast pump main body and a breast pump disclosed in Chinese Patent Application No. 202311361803.5), the suction force received by one side of the breast is significantly less than that of the other side (because the pipeline lengths connecting the breast shields on both sides to the breast pump main body are different, and the suction force of the air pump is related to the length of the connected pipeline). Therefore, this may cause discomfort to the mother. To solve the above problems, the neck-hanging breast pump provided in Embodiment 1 of the present utility model, as Figures 1 to 4 shown, includes a breast pump main body 1 and two breast shields 2; the breast pump main body 1 includes an air pump 11, a solenoid valve 12, and a neck-hanging structure 13; both ends of the neck-hanging structure 13 are respectively provided with a first containment shell part 131 and a second containment shell part 132; a first air vent 1311 is provided on the first containment shell part 131; a second air vent 1321 is provided on the second containment shell part 132; an air pump 11 is provided in the first containment shell part 131; a solenoid valve 12 is provided in the first containment shell part 131; the air intake port of the solenoid valve 12 in the first containment shell part 131 is hermetically connected to the air pump 11 in the first containment shell part 131 through a pipeline; the first air vent 1311 is hermetically connected to the air outlet of the solenoid valve 12 in the first containment shell part 131; an air pump 11 is provided in the second containment shell part 132; a solenoid valve 12 is provided in the second containment shell part 132; the air intake port of the solenoid valve 12 in the second containment shell part 132 is hermetically connected to the air pump 11 in the second containment shell part 132 through a pipeline; the second air vent 1321 is hermetically connected to the air outlet of the solenoid valve 12 in the second containment shell part 132; the first air vent 1311 is connected to a breast shield 2 through a pipeline; the second air vent 1321 is connected to a breast shield 2 through a pipeline.

[0024] When the neck-mounted breast pump provided in Embodiment 1 of the present utility model is in use, the neck-mounted structure 13 and the first housing portion 131 and the second housing portion 132 fixed at both ends of the neck-mounted structure are prior art (the comparative documents mentioned in the background art are already public), and their specific structures and wearing methods belong to the prior art and will not be elaborated here. After the mother completes the wearing of the neck-mounted structure 13 and stabilizes, two breast pump shields 2 are worn on the mother's two breasts respectively. Since the two breast pump shields 2 are respectively communicated with the first ventilation port 1311 and the second ventilation port 1321 at both ends of the neck-mounted structure 13, and an air pump 11 is provided in the first housing portion 131 of the first ventilation port 1311 and an electromagnetic valve 12 is provided in the second housing portion 132 of the second ventilation port 1321 to control the on-off, therefore, compared with the neck-mounted breast pumps in the prior art that provide different suction forces on both sides and have poor milk suction effect, the device provided in this embodiment can provide the same suction force to the mother's two breasts, so that the mother can breastfeed more comfortably and improve the milk suction effect.

[0025] The neck-mounted breast pump provided in the embodiment of the present utility model solves the problem that the neck-mounted breast pumps in the prior art have different suction forces on both sides and poor milk suction effect, and can improve the milk suction effect of the neck-mounted breast pump.

[0026] As a preferred solution, in this embodiment, the breast pump main body further includes a control board 3 and a battery 4; the control board 3 is disposed in the first housing portion 131; a battery 4 is disposed in the first housing portion 131; a battery 4 is disposed in the second housing portion 132; the battery 4 in the first housing portion 131 and the battery in the second housing portion 132 are both electrically connected to the control board 3; the air pump 11 in the first housing portion 131 and the air pump 11 in the second housing portion 132 are both electrically connected to the control board 3; the electromagnetic valve 12 in the first housing portion 131 and the electromagnetic valve 12 in the second housing portion 132 are both electrically connected to the control board 3. The control board 3 is prior art, and the two air pumps 11 and the two electromagnetic valves 12 are respectively and independently controlled by the control board 3; the battery 4 in the first housing portion 131 and the battery 4 in the second housing portion 132 achieve the balance of the weights on both sides of the neck-mounted structure 13 by adjusting the weight; in addition, buttons for human-computer interaction are disposed on the outer side of the first housing portion 131 provided with the control board 3, and the circuits in the first housing portion 131 and the second housing portion 132 are communicated, which have been publicly disclosed in the background art and will not be elaborated here.

[0027] As a preferred solution, in this embodiment, both ends of the neck-hanging structure 13 are fixedly connected to the first housing part 131 and the second housing part 132 through the housing parts respectively to form a C shape; the outer housing parts of the neck-hanging structure 13 are fixedly connected to the outer housing parts of the first housing part 131 and the second housing part 132 respectively; skin-friendly layers are provided on the inner sides of the neck-hanging structure 13, the first housing part 131, and the second housing part 132; a flexible abutting layer 134 is provided on the inner side of the neck-hanging structure 13. The skin-friendly layer can prevent the human skin from coming into contact with the neck-hanging structure 13 and causing discomfort, which has been disclosed in the comparative document provided in the background art. The flexible abutting layer 134 is provided on the inner side of the C shape of the neck-hanging structure 13 and is used to reduce the vibration effect of the air pump in the first housing part 131 and the second housing part 132 after the mother wears the neck-hanging structure 13, so that the mother can remain comfortable after wearing the neck-hanging structure 13.

[0028] To facilitate the mother to remove the breast pump shield 2 after finishing breast pumping, as a preferred solution, in this embodiment, the breast pump shield 2 is detachably connected to the first ventilation port 1311 through a pipeline; the breast pump shield 2 is detachably connected to the second ventilation port 1321 through a pipeline. The breast pump shield 2 bears the breast milk after the mother breastfeeds, so it is not convenient for the mother to directly remove the neck-hanging structure 13 after removing the breast pump shield 2, because during the process of removing the neck-hanging structure 13, the breast pump shield 2 connected to the neck-hanging structure 13 through the pipeline will be driven to move. Therefore, a detachable structure is provided in this embodiment, so that after the breast pump shield 2 is separated from the mother's breast, it can be separated from the neck-hanging structure 13, and finally the neck-hanging structure 13 is removed to complete breast pumping.

[0029] The specific structure of the breast pump shield 2 is not disclosed in the comparative document, and the common breast pump shields still require manual support. To demonstrate the advantages of the neck-hanging breast pump (allowing the mother to move unrestrictedly during the milk pumping process), it is necessary to reduce the volume of the breast pump structure inside the bra. As a preferred solution, in this embodiment, the breast pump shield 2 includes a funnel-shaped base 21, a tee 22, and a hood-shaped outer shell 23; the outer shell 23 is detachably fixed to the base 21; when the outer shell 23 is fixed to the base 21, the small opening of the funnel of the base 21 faces the inner cavity of the outer shell 23; the large opening of the funnel of the base 21 is tightly sealed against the hood-shaped opening of the outer shell 23; the tee 22 is arranged in the space formed by the outer shell 23 and the base 21; the tee 22 includes a milk inlet 221, a negative pressure port 222, and a milk outlet 223; the small opening of the funnel of the base 21 is hermetically connected to the milk inlet 221 of the tee 22; the outer shell 23 is provided with a ventilation hole 231; the ventilation hole 231 is hermetically connected to the negative pressure port 222; a flexible membrane is arranged between the ventilation hole 231 and the negative pressure port 222; the milk outlet 223 is connected to the inlet of a duckbill valve 24; the outlet of the duckbill valve 24 is inside the inner cavity of the outer shell 23. In this embodiment, the existing wearable breast pump is improved by removing the internal air pump, solenoid valve and other structures of the existing hood-shaped wearable breast pump, thereby reducing the weight and volume, enabling the mother to only place the structure with milk storage function inside the bra for milk pumping, thus facilitating the mother's movement; one end of the pipeline is hermetically connected to the first ventilation port 1311 or the second ventilation port 1321, and the other end of the pipeline is hermetically connected to the ventilation hole 231 on the outer shell 23. When suction is applied at the ventilation hole 231, the air pressure on one side of the ventilation hole 231 becomes smaller, and the flexible membrane between the ventilation hole 231 and the negative pressure port 222 deforms, thereby changing the air pressure inside the tee 22 (the mother's breast is tightly attached to the inner wall of the funnel of the funnel-shaped base 21, and the mother's breast, the base 21 and the tee 22 form a sealed space, and the mother's breast is inside this sealed space, and the air pressure inside the tee is the air pressure inside this sealed space). When the air pressure inside the tee 22 becomes smaller, breast milk is secreted from the mother's nipple and flows into the tee 22. When a certain amount of milk accumulates in the tee 22, the duckbill valve opens due to the gravity of the milk (the outlet of the duckbill valve faces down), and the milk flows from the tee 22 into the milk storage space between the hood-shaped outer shell 23 and the base 21; after completing milk pumping and removing the breast pump shield 2, ensure that the hood shell of the hood-shaped outer shell 23 is vertically upward, separate the base 21 from the outer shell 23, and the tee 22 will be separated together with the base 21. The flexible membrane blocks the ventilation hole 231, and the milk will remain in the hood body of the outer shell 23. The mother can pour the milk in the hood body of the outer shell 23 into a container such as a milk bottle for storage.

[0030] In summary, the present utility model provides a neck-hanging breast pump, which relates to the field of breast pumps and includes a breast pump main body and two breast pump shields; the breast pump main body includes an air pump, a solenoid valve and a neck-hanging structure; both ends of the neck-hanging structure are respectively provided with a first accommodating shell part and a second accommodating shell part; a first ventilation port is provided on the first accommodating shell part; a second ventilation port is provided on the second accommodating shell part; one of the air pumps is arranged in the first accommodating shell part; one of the solenoid valves is arranged in the first accommodating shell part; the air inlet of the solenoid valve in the first accommodating shell part is hermetically communicated with the air pump in the first accommodating shell part through a pipeline; the first ventilation port is hermetically communicated with the air outlet of the solenoid valve in the first accommodating shell part; one of the air pumps is arranged in the second accommodating shell part; one of the solenoid valves is arranged in the second accommodating shell part; the air inlet of the solenoid valve in the second accommodating shell part is hermetically communicated with the air pump in the second accommodating shell part through a pipeline; the second ventilation port is hermetically communicated with the air outlet of the solenoid valve in the second accommodating shell part; the first ventilation port is communicated with one of the breast pump shields through a pipeline; the second ventilation port is communicated with one of the breast pump shields through a pipeline. The neck-hanging breast pump provided by the present utility model solves the problem that the suction forces on both sides of the neck-hanging breast pump in the prior art are different and the milk suction effect is poor, and can improve the milk suction effect of the neck-hanging breast pump.

[0031] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the description and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A neck-hanging breast pump, comprising a breast pump main body and two breast pump shields; the breast pump main body includes an air pump, a solenoid valve and a neck-hanging structure; both ends of the neck-hanging structure are respectively provided with a first accommodating shell part and a second accommodating shell part; a first ventilation port is arranged on the first accommodating shell part; a second ventilation port is arranged on the second accommodating shell part; it is characterized in that ; One air pump is arranged in the first containment housing part; One electromagnetic valve is arranged in the first containment housing part; The air inlet of the electromagnetic valve in the first containment housing part is hermetically connected to the air pump in the first containment housing part through a pipeline; The first ventilation port is hermetically connected to the air outlet of the electromagnetic valve in the first containment housing part; One air pump is arranged in the second containment housing part; One electromagnetic valve is arranged in the second containment housing part; The air inlet of the electromagnetic valve in the second containment housing part is hermetically connected to the air pump in the second containment housing part through a pipeline; The second ventilation port is hermetically connected to the air outlet of the electromagnetic valve in the second containment housing part; The first ventilation port is connected to a breast pump shield through a pipeline; the second ventilation port is connected to a breast pump shield through a pipeline.

2. The neck-hanging breast pump according to claim 1, wherein The breast pump main body further includes a control board and a battery; the control board is arranged in the first containment housing part; One battery is arranged in the first containment housing part; one battery is arranged in the second containment housing part; The battery in the first containment housing part and the battery in the second containment housing part are both electrically connected to the control board; The air pump in the first containment housing part and the air pump in the second containment housing part are both electrically connected to the control board; The electromagnetic valve in the first containment housing part and the electromagnetic valve in the second containment housing part are both electrically connected to the control board.

3. The neck-hanging breast pump according to claim 1, characterized in that, Both ends of the neck strap structure are fixedly connected to the first containment housing part and the second containment housing part respectively through the housing parts to form a C shape; The outer shell parts of the neck strap structure are fixedly connected to the outer shell parts of the first containment housing part and the second containment housing part respectively; skin-friendly layers are arranged on the inner sides of the neck strap structure, the first containment housing part, and the second containment housing part; A flexible abutting layer is arranged on the inner side of the neck strap structure.

4. The neck-hanging breast pump according to claim 1, wherein The breast pump shield is detachably connected to the first ventilation port through a pipeline; The breast pump shield is detachably connected to the second ventilation port through a pipeline.

5. The neck-hanging breast pump according to claim 1, wherein The breast pump shield includes a funnel-shaped base, a three-way joint, and a hood-shaped outer shell; The outer shell is detachably fixed on the base; When the outer shell is fixed on the base, the small opening of the funnel of the base faces the inner cavity of the outer shell; the large opening of the funnel of the base is hermetically attached to the hood-shaped opening of the outer shell; The three-way joint is arranged in the space formed by the outer shell and the base; The three-way joint includes a milk inlet, a negative pressure port, and a milk outlet; The small opening of the funnel of the base is hermetically connected to the milk inlet of the three-way joint; Ventilation holes are arranged on the outer shell; the ventilation holes are hermetically connected to the negative pressure port; a flexible film is arranged between the ventilation holes and the negative pressure port for isolation; A duckbill valve inlet is connected to the milk outlet; the outlet of the duckbill valve is inside the inner cavity of the outer shell.

Citation Information

Patent Citations

  • Breast pump main machine and breast pump

    CN117482314A

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    CN219764107U