Wearable breast pump

Abstract

The invention relates to the technical field of mother and baby products, in particular to a wearable breast pump which comprises a shell, a breast pumping cover and a milk bowl, a negative pressure mechanism is arranged in the shell, the breast pumping cover comprises an attaching cover and a suction bowl which are integrally formed, and a breast pumping cavity is defined by the attaching cover and the suction bowl; an air pressure cover is arranged in the milk bowl and connected with the milk sucking cover in a sealed mode. The periphery of the breast is wrapped by the attaching cover and the suction bowl, the suction bowl extends into the air pressure cover, the suction bowl and the air pressure cover are coaxially arranged, the suction bowl and the air pressure cover define a negative pressure cavity, and the negative pressure mechanism drives the first elastic structure and the second elastic structure of the suction bowl to generate expansion and contraction elastic deformation in the negative pressure cavity. The elastic deformation efficiency of the suction bowl is improved through the first elastic structure and the second elastic structure, so that the efficiency of generating negative pressure in the breast suction cavity is improved, the simulation action of sucking the breast by an infant is achieved, the breast is stimulated to secrete milk, the breast suction effect is improved, and the comfort of a mother in the lactation period when using the breast pump is improved.

Description

Technical Field

[0001] This invention relates to the technical field of maternal and infant products, and more particularly to a wearable breast pump. Background Technology

[0002] Wearable breast pumps are devices that can be worn on the body, allowing for breastfeeding without the need for hand support, providing breastfeeding mothers with a more convenient and free tool for expressing milk. In some existing wearable breast pumps, the inner cavity of the pump is axially designed, and the negative pressure pump directly draws air into the inner cavity of the pump. If the negative pressure is not properly adjusted or used for too long, the nipples may be subjected to excessive pressure for an extended period, easily leading to nipple edema, pain, or even damage. Furthermore, excessive or inappropriate negative pressure stimulation may interfere with the normal milk ejection reflex mechanism of the mammary glands, resulting in decreased milk expression efficiency with long-term use.

[0003] To address the aforementioned issues, Chinese patent application number 202322616139.6 discloses a wearable breast pump with an elastic airbag. This breast pump has a through-cavity breast pump chamber that extends axially, and an mounting cavity on the upper side of the breast shield that communicates with the breast shield chamber. The elastic airbag is located within this mounting cavity and is connected to a negative pressure pump. The negative pressure pump causes the elastic airbag to expand or contract elastically, creating negative pressure in the mounting cavity. This negative pressure, in turn, drives the breast shield chamber to generate negative pressure, allowing milk to be pumped out of the breast. While this patent improves the negative pressure structure of the breast pump, the elastic airbag is independently positioned on the upper part of the breast shield, and the airway between the mounting cavity and the breast shield chamber is relatively long. This results in low efficiency in generating negative pressure within the breast shield chamber, leading to still relatively low pumping efficiency.

[0004] This invention was proposed in response to the shortcomings of existing technologies. Summary of the Invention

[0005] This invention addresses the problem mentioned above regarding the low efficiency of generating negative pressure within the breast shield cavity of existing wearable breast pumps, resulting in limited milk extraction efficiency, and proposes a wearable breast pump.

[0006] The technical solution adopted by this invention to solve its technical problem is: Wearable breast pumps include: A housing, wherein a negative pressure mechanism is provided inside the housing; A breast suction shield, comprising an integrally molded cover and a suction cup, wherein the cover and the suction cup together form a breast suction cavity; A milk bowl, wherein an air pressure cover is provided inside the milk bowl, the breast suction cover is sealed to the air pressure cover, and the suction bowl extends into the air pressure cover and forms a negative pressure chamber with the air pressure cover; The suction bowl includes a first elastic structure and a second elastic structure disposed between the fitting cover and the first elastic structure. The first elastic structure elastically deforms in the negative pressure cavity along the axial direction, and the second elastic structure elastically deforms in the negative pressure cavity along the radial direction.

[0007] As described above, in the wearable breast pump, the first elastic structure includes a plurality of elastic peak layers, any two of the elastic peak layers are connected by an arc, and the outer diameter of each elastic peak layer gradually decreases along the axial direction of the breast pump in the direction away from the fitting cover.

[0008] As described above, in the wearable breast pump, the second elastic structure includes a second elastic groove, and the bottom wall of the second elastic groove undergoes elastic deformation radially within the negative pressure chamber; the bottom wall of the second elastic groove includes a first connecting wall connected to the fitting cover and a second connecting wall disposed between the first connecting wall and the first elastic structure, and there is a preset angle between the first connecting wall and the second connecting wall.

[0009] As described above, the second elastic structure of the wearable breast pump further includes several arched walls, each of which is distributed circumferentially on the peripheral wall of the suction bowl, and the second elastic groove is provided between two adjacent arched walls.

[0010] As described above, each of the arched walls of the wearable breast pump is provided with a first elastic groove that is recessed toward the milk suction cavity.

[0011] The wearable breast pump described above has a negative pressure chamber volume of 12 to 24 cubic centimeters.

[0012] In the wearable breast pump described above, the ratio of the outer circumference of the suction bowl to the inner circumference of the air pressure cover in the axial section of the suction bowl and the air pressure cover is 90% to 99%.

[0013] As described above, the wearable breast pump further includes a mounting portion disposed between the fitting cover and the suction bowl, and a one-way milk outlet structure disposed between the mounting portion and the fitting cover. The milk bowl and the breast pump form a milk storage chamber isolated from the negative pressure chamber. The breast pump is sealed to the air pressure cover through the mounting portion. The one-way milk outlet structure has a one-way milk outlet channel from the milk suction chamber to the milk storage chamber.

[0014] As described above, the wearable breast pump includes an outer cover and an inner cover. The inner cover is integrally formed with the suction bowl. The outer cover is located on the outer periphery of the inner cover, and a deformation gap is provided between the inner cover and the outer cover. The outer cover includes a hard plastic body integrally formed with the inner cover, a first soft plastic component and a second soft plastic component integrally formed with the hard plastic body. The periphery of the hard plastic body has a flange facing the breast bowl. The first soft plastic component is located on the outer side of the flange, and the second soft plastic component is located on the inner side of the flange and forms a groove with the flange. The breast bowl has a retaining ring that engages with the groove, and the retaining ring is sealed within the groove.

[0015] As described above, in the wearable breast pump, the milk bowl is provided with an air inlet tube communicating with the negative pressure chamber. A connector is provided between the negative pressure mechanism and the air inlet tube. The connector has an air passage that can conduct air between the negative pressure mechanism and the air inlet tube. The connector is made of a flexible material. The housing is provided with a connecting part that connects to the connector. One end of the connector passes through the connecting part and is sealed to the air inlet tube, so that the negative pressure mechanism communicates with the negative pressure chamber.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting a suction bowl that can produce elastic deformation in the breast pump, when the negative pressure mechanism draws air into the negative pressure chamber at a certain frequency, a pressure difference is generated in the negative pressure chamber. This causes the first and second elastic structures of the suction bowl to expand and contract elastically within the negative pressure chamber. By improving the elastic deformation efficiency of the suction bowl through the first and second elastic structures, the efficiency of generating negative pressure in the breast pump chamber is improved, realizing the simulated action of a baby sucking the breast, stimulating the breast to secrete milk, thereby improving the milk extraction effect and enhancing the comfort of breastfeeding mothers when using the breast pump. 2. During breast pumping, the first elastic structure can stretch and deform axially within the negative pressure chamber, and through the first elastic structure, it drives the second elastic structure to stretch and deform axially, thereby improving the elastic deformation efficiency of the suction bowl, thus increasing the efficiency of generating negative pressure in the breast pumping chamber, promoting milk secretion, and improving the breast pumping efficiency and effect. At the same time, the negative pressure chamber extends to one side of the second elastic structure, and the second elastic structure can expand and deform radially towards the negative pressure chamber under the action of negative pressure, thereby increasing the internal space of the breast pumping chamber, improving the comfort of breastfeeding mothers during breast pumping, and thus achieving the purpose of protecting the breasts. 3. The increased pressure within the negative pressure chamber causes the first elastic structure to contract and deform axially within the chamber. This, in turn, drives the second elastic structure to contract and deform axially, restoring the suction bowl to its original shape. Simultaneously, the second elastic structure contracts and deforms radially towards the milk-suction chamber, further squeezing the breast and enhancing the massage effect of the suction bowl. This further stimulates milk secretion. Compared to traditional breast pumps that only promote milk output when the negative pressure mechanism is inhaling, the wearable breast pump in this embodiment can also squeeze and stimulate the breast through the second elastic structure even when the negative pressure mechanism is not inhaling, thereby improving the milk-suction effect, reducing milk residue in the breast, promoting milk emptying, and improving the milk ejection reflex. 4. The suction cup and air pressure cover wrap around the breast. The suction cup and air pressure cover are coaxially set. By wrapping the breast around the suction cup and making the whole body elastically deform, the pressure inside the milk suction cavity can be evenly distributed. This makes the breast periphery experience uniform pressure changes, which helps to improve the milk suction effect and avoids damage to the breast caused by excessively high or low local pressure.

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a perspective view of the wearable breast pump of the present invention; Figure 2 Disassembly of the wearable breast pump of the present invention Figure 1 ; Figure 3 Disassembly of the wearable breast pump of the present invention Figure 2 ; Figure 4 This is a front view of the wearable breast pump of the present invention; Figure 5 for Figure 4 F-F section view in the middle; Figure 6 This is a perspective view of the suction bowl of the present invention; Figure 7 This is a side view of the suction bowl of the present invention; Figure 8 for Figure 7 The B-B section view in the diagram; Figure 9 for Figure 7 C-C section view in the middle; Figure 10 for Figure 9 Enlarged view of part D in the image; Figure 11 for Figure 5 Enlarged view of part E in the image; Figure 12 This is a diagram showing the internal structure of the milk bowl of the present invention; Figure 13 The suction bowl and air pressure cover of the present invention are in Figure 4 Exploded view from section A-A; Figure 14 This is a schematic diagram of the unidirectional milk outlet structure of the present invention in the interception state; Figure 15 This is a schematic diagram of the unidirectional milk outlet structure of the present invention in the open state. Detailed Implementation

[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0022] like Figure 1As shown in Figure 15, this invention provides a wearable breast pump, including a housing 4, a breast shield 1, a milk bowl 2, and a negative pressure mechanism 3. The housing 4 is located on the upper side of the milk bowl 2, and the negative pressure mechanism 3 is located inside the housing 4. The breast shield 1 includes an integrally formed fitting cover 11 and a suction bowl 12, which together form a breast pump cavity 14. The fitting cover 11 is used to fit the human breast. An air pressure cover 21 is located inside the milk bowl 2, and the breast shield 1 is sealed to the air pressure cover 21. The bowl 12 extends into the air pressure cover 21 and surrounds the air pressure cover 21 to form a negative pressure cavity 211, and the axial direction of the breast suction cover 1 is on the same straight line as the axial direction of the air pressure cover 21; the suction bowl 12 includes a first elastic structure 121 and a second elastic structure 122 disposed between the fitting cover 11 and the first elastic structure 121, the first elastic structure 121 elastically deforms axially within the negative pressure cavity 211, and the second elastic structure 122 elastically deforms radially within the negative pressure cavity 211; Figure 5 Arrow H2 indicates the axial stretching direction of the suction bowl 12 in the negative pressure chamber 211 when the negative pressure mechanism 3 draws in air, and arrow H1 indicates the radial expansion direction of the suction bowl 12 in the negative pressure chamber 211 when the negative pressure mechanism 3 draws in air, and the suction bowl 12 returns to its original shape in the opposite direction of the above arrows H2 and H1.

[0023] In practical applications, the fitting cover 11 fits tightly against the outside of the human breast. The breast can extend into the suction cup 12 along the axial direction of the breast cover 14, with one end of the nipple positioned above the one-way milk outlet structure 15. At this time, the breast, the fitting cover 11, and the suction cup 12 enclose the suction cup 14, preventing milk leakage through the fitting cover 11 by ensuring a tight fit between the breast and the breast. The negative pressure chamber 211 is formed by the fitting cover 11, the suction cup 12, and the air pressure cover 21. The breast cover 1 and the air pressure cover 21 are sealed together to prevent air leakage from the negative pressure chamber 211. The negative pressure mechanism 3 can be a common air pump. The negative pressure mechanism 3 draws air into the negative pressure chamber 211 at a certain frequency, creating a pressure difference within the negative pressure chamber 211. This causes the first elastic structure 121 and the second elastic structure 122 of the suction cup 12 to generate pressure within the negative pressure chamber. The first elastic structure 121 and the second elastic structure 122 enhance the elastic deformation efficiency of the suction bowl 12, thereby improving the efficiency of generating negative pressure within the breast pump cavity 14. This simulates the sucking action of an infant, stimulating milk secretion and improving the milk extraction effect, as well as enhancing the comfort of breastfeeding mothers using the breast pump. Secondly, the fitting cover 11 and the suction bowl 12 wrap around the outer periphery of the breast. The suction bowl 12 and the air pressure cover 21 are coaxially arranged. By wrapping the outer periphery of the breast with the suction bowl 12 and generating elastic deformation as a whole, the pressure inside the breast pump cavity 14 can be evenly distributed, thus ensuring uniform pressure changes around the breast. This is beneficial for improving the milk extraction effect and preventing damage to the breast from excessively high or low local pressure. In addition, during milk extraction, the suction bowl 12 can drive the fitting cover 11 to expand and contract, further squeezing and stimulating the breast and improving the milk extraction effect.

[0024] The specific working process of the wearable breast pump is as follows: when the negative pressure mechanism 3 draws in air, negative pressure is generated in the negative pressure chamber 211, causing the first elastic structure 121 to move axially (e.g., ...). Figure 5 Arrow H2 in the diagram stretches and deforms within the negative pressure chamber 211, and through the first elastic structure 121, drives the second elastic structure 122 to stretch and deform axially, thereby improving the elastic deformation efficiency of the suction bowl 12, thus enhancing the efficiency of the negative pressure generated by the milk suction chamber 14, promoting milk secretion from the breast, and further improving the milk suction efficiency and effect of the breast pump; simultaneously, the negative pressure chamber 211 extends to one side of the second elastic structure 122, and the second elastic structure 122 is subjected to negative pressure radially (e.g., Figure 5Arrow H1) expands and deforms towards the negative pressure chamber 211 to increase the internal space of the milk suction chamber 14, improving the comfort of breastfeeding mothers and thus protecting the breasts. When the negative pressure mechanism 3 is not drawing air, the pressure inside the negative pressure chamber 211 increases, causing the first elastic structure 121 to contract and deform axially within the negative pressure chamber 211. The first elastic structure 121 then drives the second elastic structure 122 to contract and deform axially, thus restoring the suction bowl to its original shape. Simultaneously, the second elastic structure 122 contracts and deforms radially towards the milk suction chamber 14, further squeezing the breast and enhancing the massage effect of the suction bowl 12 on the breast, further stimulating milk secretion. Compared to traditional breast pumps that only promote milk output when the negative pressure mechanism 3 is drawing air, the wearable breast pump in this embodiment can also squeeze and stimulate the breast through the second elastic structure when the negative pressure mechanism 3 is not drawing air, thereby improving the milk suction effect, reducing milk residue in the breast, promoting milk emptying, and improving the milk ejection reflex.

[0025] Furthermore, such as Figure 5As shown in Figures 7 and 9, the first elastic structure 121 is located at the end of the suction bowl 12 away from the fitting cover 11. The first elastic structure 121 includes a plurality of elastic peak layers 1211. Any two elastic peak layers 1211 are connected by an arc, and the arc connection between two adjacent elastic peak layers 1211 forms a trough structure. The outer diameter of each elastic peak layer 1211 gradually decreases along the axial direction of the breast shield 1 in the direction away from the fitting cover 11. In this embodiment, the end of the suction bowl 12 forms a wave-shaped annular elastic wall through each elastic peak layer 1211. During breastfeeding, each elastic peak layer 1211 expands and contracts layer by layer in the negative pressure chamber 211 along the axial direction of the air pressure cover 21. This process is closer to the dynamic process of a baby naturally sucking on the breast, which can more effectively trigger the milk ejection reflex of the breast and improve the milk extraction efficiency. The peak and trough structure between each elastic peak layer 1211 makes the suction bowl 12 and the breast... Multiple spatial regions of different sizes and shapes are formed between the layers, allowing the negative pressure to be distributed more evenly on the surface of the breast during breast pumping. This avoids situations where the breast experiences excessively high or low local negative pressure, preventing breast damage and protecting the breast, thus improving user comfort. It ensures that all parts of the breast receive appropriate and even negative pressure stimulation, comprehensively promoting milk secretion and drainage. Furthermore, the peak and trough structures between the elastic peak layers 1211 increase the spatial variation of the breast pump cavity 14. Compared to traditional breast shield structures, under the same negative pressure value, the first elastic structure 121 exhibits a greater range of negative pressure changes in the breast pump cavity 14 during the elastic expansion and contraction process, providing a stronger stimulation to the breast, simulating a baby's powerful sucking action, and thus more effectively promoting milk drainage. Additionally, the peak and trough structures of the elastic peak layers 1211 also improve the elastic deformation stability of the first elastic structure 121, extending the service life of the breast shield 1. It should be noted that along... Figure 5 In the direction of arrow H2, the crest structure is the structure that bulges out toward the air pressure shroud 21, and the trough structure is the structure that is recessed relative to the air pressure shroud 21.

[0026] In another optional embodiment of the invention, such as Figure 5As shown in Figure 11, the second elastic structure 122 includes a second elastic groove 1223, which is located on the periphery of the suction bowl 12. The second elastic groove 1223 is obliquely downward toward the breast pump cavity 14, and the bottom wall 1224 of the second elastic groove undergoes elastic deformation radially within the negative pressure cavity 211. The bottom wall 1224 of the second elastic groove is the peripheral wall of the suction bowl 12. When the user wears the wearable breast pump and the breast is placed in the breast pump cavity 14, the bottom wall 1224 of the second elastic groove exerts a certain squeezing force on the breast due to its own elasticity. When the negative pressure mechanism 3 draws air into the negative pressure cavity 211, a negative pressure is generated within the negative pressure cavity 211, and the bottom wall 1224 of the second elastic groove moves toward the negative pressure cavity 211. 1. Expansion: The bottom wall 1224 of the second elastic groove expands outward relative to the milk suction cavity 14 to increase the internal space of the milk suction cavity 14, thereby improving the user's comfort during milk suction without affecting the milk suction effect. When the negative pressure mechanism 3 does not draw air from the negative pressure cavity 211, the pressure inside the negative pressure cavity 211 increases, and the bottom wall 1224 of the second elastic groove returns to its original shape, thereby enhancing the squeezing and stimulation of the breast and further promoting milk secretion. Compared with traditional breast pumps that only stimulate the breast when the negative pressure mechanism 3 draws air, the breast pump in this embodiment can squeeze and stimulate the breast through each of the second elastic grooves 1223 even when the negative pressure mechanism 3 does not draw air, thereby improving the milk suction effect, reducing milk residue in the breast, promoting milk emptying from the breast, and improving the milk ejection reflex.

[0027] Further optional, such as Figure 11 As shown, the bottom wall 1224 of the second elastic groove includes a first connecting wall 12241 connected to the fitting cover 11 and a second connecting wall 12242 disposed between the first connecting wall 12241 and the first elastic structure 121. A preset included angle 1225 exists between the first connecting wall 12241 and the second connecting wall 12242, and the connection point between the first connecting wall 12241 and the second connecting wall 12242 is preferably an arc angle to improve user comfort. Furthermore, the first connecting wall 12241 and the breast shield 1 are axially (e.g., ...) Figure 11 There is also a first angle S1 between the dotted line L0 in the diagram, that is, the first connecting wall 12241 extends obliquely downward relative to the axial direction of the breast shield 1, and the second connecting wall 12242 extends obliquely downward relative to the axial direction of the breast shield 1 (e.g., ...). Figure 11There is also a second angle S2 between the dotted line L0 in the diagram, that is, the second connecting wall 12242 extends obliquely upward relative to the axial direction of the breast suction cup 1; the end of the first connecting wall 12241 away from the second connecting wall 12242 is connected to the fitting cover 11, and the end of the second connecting wall 12242 away from the first connecting wall 12241 is arc-shaped connected to the first elastic structure 121; by setting the second elastic groove 1223 obliquely downward toward the breast suction cavity 14, the bottom wall 1224 of the second elastic groove can squeeze the breast, so as to further enhance the massage stimulation effect of the suction bowl 12 on the breast, thereby improving the milk suction effect; and there is a preset angle 1225 between the first connecting wall 12241 and the second connecting wall 12242, so as to further enhance the elastic deformation efficiency and deformation stability of the second elastic structure 122, and extend the service life of the suction bowl 12.

[0028] Preferably, the second elastic groove 1223 is provided in a plurality of portions and is evenly distributed along the circumference of the suction bowl 12, so that the second elastic structure wraps around the outer periphery of the breast, further enhancing the massage stimulation effect of the suction bowl 12 on the breast, thereby improving the milk suction effect, and the breast is subjected to uniform force, thereby achieving the purpose of protecting the breast on the basis of improving the milk suction effect.

[0029] In another optional embodiment of the invention, such as Figure 6 As shown in Figure 9, the second elastic structure 122 further includes a plurality of arched walls 1221, each of which is distributed circumferentially on the peripheral wall of the suction bowl 12, and a second elastic groove 1223 is provided between two adjacent arched walls; as shown in Figure 9. Figure 6 As shown, each of the arched walls 1221 arches outward along the radial direction of the breast shield 1, and each of the arched walls 1221 extends axially along the breast shield 1. The negative pressure mechanism 3 causes each of the arched walls 1221 to elastically deform within the negative pressure cavity 211; from Figure 8From a cross-sectional perspective, the arched wall 1221 forms a U-shaped structure with its opening facing the milk suction cavity 14. During milk suction, a negative pressure is generated in the negative pressure cavity 211. The first elastic structure 121 undergoes axial tensile deformation within the negative pressure cavity 211, simultaneously causing each of the arched walls 1221 to stretch in the same direction. Furthermore, as the bottom wall 1224 of the second elastic groove expands towards the negative pressure cavity 211, each of the arched walls 1221 is also subjected to the tension of the bottom wall 1224 of the second elastic groove located on both sides, reducing the arch height of the arched wall 1221 and increasing the radial dimension of the two sides of the arched wall 1221. The increased size of the suction bowl 12 allows it to fit the breast more closely, applying even pressure to the breast surface and promoting milk flow while preventing milk residue. During the elastic deformation of the arched walls 1221, the internal space and pressure of the breast shield 1 change regularly, providing a massage effect on the breast, improving user comfort, promoting milk secretion, and increasing milk volume. Furthermore, the arched walls 1221 enhance the structural strength of the suction bowl 12, improving its elastic deformation stability and extending its service life. In other embodiments, the arched walls 1221 are connected to the first elastic structure 121 via an arc segment, further enhancing the overall elasticity of the suction bowl 12 and improving milk extraction.

[0030] Furthermore, such as Figure 10 As shown, each of the arched walls 1221 is provided with a first elastic groove 1222 recessed towards the milk suction cavity 14. The first elastic groove 1222 is obliquely recessed from the arch top of the arched wall 1221 towards the milk suction cavity 14 to further enhance the structural strength and elastic performance of the arched wall 1221, thereby further improving the elastic deformation capability of the suction bowl 12. Under the same negative pressure value, the milk suction effect of the suction bowl 12 is stronger, and the structure of the suction bowl 12 is more stable and has a longer service life under long-term use of the breast pump. Optionally, the specific structure of the first elastic groove 1222 is similar to that of the second elastic groove 1223, which will not be described in detail here, and the first elastic groove 1222 is preferably an arc-shaped groove.

[0031] On the other hand, as another optional embodiment of the present invention, such as Figure 5As shown, the negative pressure chamber 211 has a volume of 12-24 cubic centimeters. In the breast pump, the negative pressure chamber 211 is formed by the air pressure cover 21, the suction bowl 12, and the fitting cover 11. The negative pressure chamber 211 provides sufficient space for the elastic deformation of the suction bowl 12 to improve the milk expression effect. During the actual milk expression process, the suction bowl 12 undergoes elastic deformation due to the pressure difference of the negative pressure chamber 211. Correspondingly, the volume of the suction bowl 12 changes before and after the elastic deformation. In this embodiment, the volume of the negative pressure chamber 211 is the volume of the suction bowl 12 in its natural state. The natural state of the suction bowl 12 is the volume of the suction bowl 12 when the negative pressure mechanism 3 is not running. The suction bowl 12 is in a state where it has not undergone elastic deformation. The volume of the suction bowl 12 in its natural state is set as V0. At this time, the volume of the negative pressure chamber 211 is equal to the volume of the inner cavity of the air pressure cover 21 minus the volume of the suction bowl 12 in its natural state, V0. When negative pressure is generated in the negative pressure chamber 211, the suction bowl 12 undergoes elastic deformation. The volume formed after the elastic deformation of the suction bowl 12 is set as V1. At this time, the absolute value of the volume difference before and after the elastic deformation of the suction bowl 12 (i.e., |V0-V1|) is less than or equal to the volume of the negative pressure chamber 211. It should be noted that in the finished breast pump, the volume of the negative pressure chamber 211 and the inner cavity volume of the air pressure cover 21 are both fixed values.

[0032] Furthermore, such as Figure 5As shown, based on the assembly relationship between the breast suction cup 1 and the air pressure cup 21, the negative pressure chamber 211 includes a first deformation region 211a and a second deformation region 211b. The first deformation region 211a is located on the front side of the first elastic structure 121 along the stretching direction of the suction cup 12, and the second deformation region 211b is located on the periphery of the second elastic structure 122. The negative pressure chamber 211 is mainly distributed in the first deformation region 211a to ensure that the first elastic structure 121 has good expansion and contraction deformation. The second deformation region 211b is the gap between the second elastic structure 122 and the air pressure cup 21. The first deformation region 211a and the second deformation region 211b are connected during the deformation of the suction cup 12. That is, when the negative pressure mechanism 3 is not running, the first deformation region 211a and the second deformation region 211b can be connected, or they can be separated due to the deformation of the suction cup. The suction bowl 12 is isolated by contacting the inner side of the air pressure cover 21, but when the suction bowl 12 undergoes elastic deformation, the first deformation area 211a and the second deformation area 211b can communicate with each other to ensure normal milk expression. Compared with traditional wearable breast pumps, on the one hand, the deformable space of the suction bowl 12 in the air pressure cover 21 is increased, while the volume of the wearable breast pump remains relatively stable or increases slightly. On the other hand, the combination of the first elastic structure 121 and the second elastic structure 122 in the suction bowl 12 enhances the elastic deformation efficiency of the suction bowl 12. In this embodiment, the air pressure cover 21 can provide sufficient deformation space for the extension and contraction deformation of the suction bowl 12, which is conducive to improving the amplitude and speed of the elastic deformation of the suction bowl 12, making the deformation of the suction bowl 12 in the negative pressure chamber 211 more uniform, avoiding reducing the elastic deformation effect of the suction bowl 12, thereby optimizing the milk expression effect and improving the milk expression efficiency. Further optionally, the air pressure shroud 21 can be configured as a cylindrical structure with a radial cross-section of polygonal, circular, or near-circular, for example, as shown in the figure. Figure 12 and Figure 13 The radial cross-section of the air pressure cover 21 shown is circular. The inner wall of the air pressure cover 21 facing the opening of its inner cavity can be set as a plane or a slightly convex arc surface to facilitate precise control of the volume of the inner cavity of the air pressure cover 21 and reduce the difficulty of processing.

[0033] Due to the limited size of wearable breast pumps in practical applications, the volume of the negative pressure chamber 211 is restricted. The volume of the negative pressure chamber 211 is closely related to the elastic deformation efficiency of the suction bowl 12. If the volume of the negative pressure chamber is too large, it means that a large amount of air will be extracted when negative pressure is generated, resulting in a larger negative pressure value. This will subject the suction bowl to greater tension, easily leading to excessive elastic deformation of the suction bowl, increasing the difficulty of elastic recovery, and causing uneven elastic deformation. For example, the edge of the suction bowl may be overstretched due to excessive negative pressure, while the deformation of the center may be relatively small, resulting in uneven elastic deformation. Alternatively, under the same negative pressure value, the suction bowl may not deform sufficiently, leading to insufficient negative pressure generated by the milk suction chamber 14, thus affecting the milk suction effect. If the volume of the negative pressure chamber is too small, the generated negative pressure is relatively small, and the external force on the suction bowl is insufficient to allow it to deform fully. The suction bowl deforms slowly, affecting the suction power and milk extraction efficiency of the breast pump. To improve the milk extraction effect of the wearable breast pump while maintaining a small overall size, this embodiment improves the volume of the negative pressure chamber 211. Through multiple tests, it has been verified that the volume of the negative pressure chamber 211 is set to 12-24 cubic centimeters. The wearable breast pump can be customized according to the different breast shapes and sizes of breastfeeding mothers, allowing the volume of the negative pressure chamber 211 to be adjusted to 12, 14, 18, 19, 21, or 24 cubic centimeters to ensure a negative pressure value of not less than 260 mm / Hg. Within the size limitations of wearable breast pumps, this maximizes the conversion of the flow rate of the negative pressure mechanism 3 into the optimal negative pressure range required for milk extraction, improving the milk extraction effect. Simultaneously, the user receives the best and most comfortable milk extraction pressure, enhancing the user experience.

[0034] In some alternative embodiments of the present invention, the volume of the negative pressure chamber 211 is 18 to 21 cubic centimeters.

[0035] On the other hand, as another optional embodiment of the present invention, such as Figure 13 As shown, in the axial section of the suction bowl 12 and the air pressure cover, the ratio of the outer wall circumference M1 of the suction bowl 12 to the inner wall circumference M2 of the air pressure cover 21 is 90% to 99%. In this embodiment, the breast pump cover 1 is provided with a mounting surface 16 that connects to the first connecting wall 12241 of the suction bowl 12. During assembly, the mounting surface 16 abuts against the air pressure cover 21 to close the opening of the negative pressure chamber 211. Along the longitudinal section of the wearable breast pump, the two ends of the outer wall circumference of the suction bowl 12 are set as follows: Figure 13The connection points of the suction bowl 12 on its upper and lower opposite sides to the mounting surface 16 are shown. The two ends of the inner wall circumference of the air pressure cover 21 are the two opposite ends of the air pressure cover 21 as shown in the figure. Based on the assembly relationship of the breast suction cover 1 and the air pressure cover 21, the suction bowl 12 extends into the inner cavity of the air pressure cover 21, and the opening of the inner cavity of the air pressure cover 21 is closed by the mounting surface 16. The negative pressure cavity 211 is formed by the mounting surface 16, the suction bowl 12, and the air pressure cover 21. It can be seen that the ratio of the outer wall circumference of the suction bowl 12 to the inner wall circumference of the air pressure cover 21 has a certain relationship with the volume of the negative pressure cavity 211. The relationship between the suction bowl 12 and the air pressure cover 21 is crucial. If the ratio of the outer circumference of the suction bowl 12 to the inner circumference of the air pressure cover 21 is too small, the suction bowl 12 is relatively small compared to the air pressure cover 21. When negative pressure is generated in the negative pressure chamber 211, the deformation of the suction bowl 12 is insufficient, resulting in a small negative pressure in the milk suction chamber 14 and insufficient milk suction power, thus affecting the milk suction efficiency of the breast pump. Conversely, if the ratio of the outer circumference of the suction bowl 12 to the inner circumference of the air pressure cover 21 is too large, the suction bowl 12 is relatively large compared to the air pressure cover 21. The air pressure cover 21 will restrict the elastic deformation of the suction bowl 12, making it unable to effectively suction the milk in the negative pressure chamber 211. Negative pressure is transmitted into the milk suction chamber 14, resulting in insufficient negative pressure within the chamber, which fails to effectively stimulate milk secretion and thus affects milk suction efficiency. Therefore, the volume of the negative pressure chamber 211 can be adjusted by improving the ratio of the outer circumference of the suction bowl 12 to the inner circumference of the air pressure cover 21, thereby improving the milk suction effect. Based on multiple tests of the breast pump during production, it was found that when the ratio of the outer circumference M1 of the suction bowl 12 to the inner circumference M2 of the air pressure cover 21 is 90% to 99%, the optimal negative pressure chamber volume can be achieved by adjusting the ratio of the outer circumference M1 of the suction bowl 12 to the inner circumference M2 of the air pressure cover 21. The ratio of the inner wall circumference M2 of 1 to 90%, 92%, 95%, 98%, 99%, etc., can improve the stretchability of the suction bowl 12. When the negative pressure mechanism 3 sucks air, the suction bowl 12 can stretch in the best state and is not easily broken due to excessive stretching, thereby improving the structural stability and service life of the suction bowl 12. Moreover, under the same negative pressure value, the elastic deformation efficiency of the suction bowl 12 is improved, so that the negative pressure between the negative pressure chamber 211 and the milk suction chamber 14 can be effectively transmitted, which can better simulate the force and stimulation of a baby sucking the breast, promote milk secretion, and thus improve milk suction efficiency. It should be noted that, as Figure 13 As shown, the portion of the outer wall circumference of the suction bowl 12 relating to the second elastic structure 122 can be either the outer wall circumference of the arched wall 1221 or the outer wall circumference of the bottom wall 1224 of the second elastic groove.

[0036] In some alternative embodiments of the present invention, the ratio of the outer circumference of the suction bowl 12 to the inner circumference of the air pressure cover 21 is 92% to 98%.

[0037] In actual production, the following testing methods are typically used to verify the impact of the structural improvements to the breast shield 1 and air pressure shield 21 on the milk expression effect. The main steps include: S1. Create a simulated breast; Specifically, simulated breasts can be made of silicone or other polymer materials that are similar to the material, elasticity, and lactation characteristics of real breasts, ensuring that their internal mammary gland structure and nipple sensitivity are as close to reality as possible, thus providing a reliable subject for testing.

[0038] S2. Set the lactation mode and lactation parameters, and the milk expression mode and milk expression parameters for the comprehensive testing instrument for the breast pump; For example, in the lactation testing mode, the initial settings are low negative pressure (e.g., 150 mmHg) and low-frequency stimulation (e.g., once per second), set to level 1. The level parameters are then increased in a certain gradient, with each increase in level adding 20 mmHg to the negative pressure and 0.5 times per second to the frequency, until high negative pressure (e.g., 300 mmHg) and high-frequency stimulation (e.g., three times per second) are achieved. At each level, the new structure of the breast pump is used to simulate lactation on the simulated breast for a certain duration (e.g., 5 minutes). The "milk secretion" initiation time and initial milk volume of the simulated breast are observed and recorded. It should be noted that the gradient of the above level parameters can be adjusted according to the actual test.

[0039] For example, in the breast pumping test mode, start with a lower negative pressure (e.g., 200 mmHg) and a moderate flow rate (e.g., 50 ml per minute), set to level 1; gradually increase the level parameters, with each level increasing the negative pressure by 30 mmHg and the flow rate by 10 ml per minute, until a higher negative pressure (e.g., 350 mmHg) and a higher flow rate (e.g., 100 ml per minute) are reached; at each level, breast pumping simulation is performed, each lasting 10 minutes, and data such as the total amount of breast milk pumped, pumping efficiency (amount of breast milk pumped per unit time), and the amount of residual milk in the simulated breast are recorded; it should be noted that the above-mentioned increment gradient of level parameters can be adjusted according to the actual test.

[0040] S3. Record test data for each gear in different modes. The test data shall include at least the negative pressure value, frequency, flow rate, lactation start time, milk volume, and residual milk volume. S4. Compare and analyze the test data; for example, compare the lactation initiation time and initial milk volume under different lactation modes and settings to find the parameter combination that can initiate lactation the fastest and produce the highest milk volume; analyze the total milk volume, milk expression efficiency, and residual milk volume under different milk expression modes and settings to determine the parameter combination with the best milk expression effect; comprehensively consider the best parameters for both lactation initiation and milk expression stages, screen out the parameter combination of negative pressure, frequency, flow rate, etc. that can achieve the best milk expression effect throughout the entire milk expression process, and determine the optimal negative pressure chamber volume.

[0041] The volume of the negative pressure chamber 211 can be controlled by adjusting the ratio of the circumference of the outer wall of the suction bowl 12 to the circumference of the inner wall of the air pressure hood 21. Based on this, the above test method also includes: Customized suction bowls 12 and air pressure hoods 21 with different perimeter ratios in their longitudinal sections were designed. For combinations of suction bowls 12 and air pressure hoods 21 with different perimeter ratios, under the same negative pressure chamber volume and the same ratio or equivalent negative pressure value between the outer wall perimeter of the suction bowl 12 and the inner wall perimeter of the air pressure hood 21, the above steps S1 to S4 were repeated to obtain different test data under different combination structures of suction bowls 12 and air pressure hoods 21 with different perimeter ratios. The optimal outer wall perimeter of the suction bowl 12 and the optimal air pressure hood 21 were determined by comprehensively considering these factors. The volume of the negative pressure chamber 211 is derived from the ratio of the inner wall circumference to the volume of the suction bowl 12 and the volume of the air pressure hood 21, calculated based on the circumference. For example, in actual testing, the volume of the suction bowl 12 in its natural state can be estimated from the outer wall circumference, and the volume of the air pressure hood 21 can be estimated from the inner wall circumference. Therefore, the volume of the negative pressure chamber 211 is the difference between the volume of the air pressure hood 21 and the volume of the suction bowl 12 in its natural state. Figure 5 As shown, along the longitudinal section of the wearable breast pump, the cross-sectional shape of the suction bowl 12 and the cross-sectional shape of the inner cavity of the air pressure cover 21 are similar to those of a cylindrical cross-section. Therefore, the volume of the suction bowl 12 in its natural state and the volume of the air pressure cover 21 can be estimated by combining the volume formula of a cylindrical structure. Alternatively, the volume of the suction bowl 12 in its natural state can be accurately calculated by methods such as the water displacement method or computer image analysis. Thus, the volume of the negative pressure chamber 211 can be calculated.

[0042] On the other hand, in order to prevent milk backflow during milk extraction from the milk suction chamber 14 and thus affect milk extraction efficiency, and to improve milk extraction efficiency, such as... Figure 10As shown in Figure 15, the breast shield 1 further includes a mounting portion 13 disposed between the fitting cover 11 and the suction bowl 12, and a one-way milk outlet structure 15 disposed between the mounting portion 13 and the fitting cover 11. The milk bowl 2 and the breast shield 1 enclose a milk storage chamber 22 isolated from the negative pressure chamber 211. The mounting portion 13 is integrally formed with the breast shield 1, and the breast shield 1 is sealed to the air pressure cover 21 through the mounting portion 13. The one-way milk outlet structure 15 provides milk outlet from the milk suction chamber 14 to the milk storage chamber. The breast pump 22 has a one-way milk outlet. During actual milk pumping, the breast secretes and outputs milk under the negative pressure environment of the milk pumping chamber 14. The milk flows from the breast into the suction bowl 12 and is guided by the one-way milk outlet structure 15 into the milk storage chamber 22. As the breast pump is used continuously, the milk level in the milk storage chamber 22 gradually rises. When a certain amount of milk accumulates in the milk storage chamber 22, the user can remove the breast pump and invert it to pour the milk out from the milk outlet 20 at the top of the breast pump for the infant to consume. Optionally, the one-way milk outlet structure 15 includes a milk outlet tube 151 connecting the milk suction chamber 14 and the milk storage chamber 22, a valve 152 located on one side of the milk outlet tube 151 and away from the suction bowl 12, and a limiting member 153 located between the valve 152 and the milk outlet tube 151. The milk outlet tube 151 extends downward from the bottom of the breast shield 1. The valve 152 is located on one side of the milk outlet tube 151 and close to the fitting cover 11. The limiting member 153 has an installation port 154. During assembly, one side of the valve 152 is connected to the breast shield 1, and the other side can be bent through the installation port 154 and abut against the breast shield 1 when subjected to force. At the port of the milk outlet tube 151, the valve 152 has an open state and a shut-off state corresponding to opening and closing the milk outlet tube 151, respectively. During actual milk expression, the milk in the milk expression chamber 14 flows through the milk outlet tube 151 to the milk storage chamber 22. At this time, the valve 152 can elastically deform under the impact of the milk, causing the end of the valve 152 covering the port of the milk outlet tube 151 to move away from the port of the milk outlet tube 151, thereby connecting the milk expression chamber 14, the milk outlet tube 151, and the milk storage chamber 22, thus achieving the open state of the valve 152 (e.g., Figure 15 As shown), at this time, the one-way milk outlet structure 15 can guide the milk from the milk suction chamber 14 to the milk storage chamber 22; due to the elastic deformation of the valve 152, it has the ability to automatically return to its original shape. When the valve 152 is not subjected to sufficient downward milk impact force, the end of the valve 152 is elastically closed again to seal the port of the milk outlet tube 151. At this time, the valve 152 is in the interception state (as shown). Figure 14As shown, this design restricts the flow of milk in the milk storage chamber 22 back into the milk suction chamber 14 via the milk outlet tube 151, thereby achieving one-way milk discharge from the breast pump and ensuring the pump's efficiency and the hygiene of the milk. Furthermore, the one-way milk discharge structure 15 and the breast shield 1 are integrally molded, which helps reduce the number of parts and assembly, lowers assembly costs and the risk of leakage due to assembly gaps, improves the sealing between the breast shield 1 and the one-way milk discharge structure 15, and enhances the durability of the one-way milk discharge structure 15.

[0043] Furthermore, both the limiting member 153 and the valve 152 are located on the side of the milk outlet pipe 151 away from the suction bowl 12. By setting the one-way milk outlet structure 15 away from the suction bowl 12, it is beneficial to reduce the pulling force of the negative pressure mechanism 3 on the one-way milk outlet structure 15 when it sucks air, and to prevent the one-way milk outlet structure 15 from easily deforming and failing, thereby extending the service life of the one-way milk outlet structure 15.

[0044] In other alternative embodiments, to reduce the assembly difficulty between the breast suction shield 1 and the air pressure shield 21, and to improve the sealing performance between the breast suction shield 1 and the air pressure shield 21, such as... Figure 10 and Figure 11 As shown, the mounting part 13 is located on the outer periphery of the breast shield 1 and along the axial direction of the breast shield 1 (e.g., Figure 11 The dashed line L0 in the figure extends away from the fitting cover 11. The mounting part 13 and the suction bowl 12 form a clamping groove 130 facing the air pressure cover 21. The mounting surface 16 is provided on the side of the clamping groove 130 facing the air pressure cover 21. The air pressure cover 21 extends along its axial direction towards the fitting cover 11. The mounting part 13 is engaged with the air pressure cover 21, that is, the air pressure cover 21 extends into the clamping groove 130 and is connected to the mounting part 13. The mounting part 13 and the breast shield 1 are integrally molded from the same material, so the mounting part 13 is elastic. The mounting part 13 wraps around the port of the air pressure cover 21 and has an elastic pre-tightening force to achieve a sealed connection between the breast shield 1 and the air pressure cover 21, preventing air and liquid leakage between the breast shield 1 and the air pressure cover 21, ensuring that the negative pressure chamber 211 and the milk storage chamber 22 in the milk bowl 2 are isolated from each other, and improving the airtightness of the negative pressure chamber 211.

[0045] Furthermore, a first sealing ring 131 is provided between the mounting part 13 and the air pressure cover 21. Optionally, the first sealing ring 131 is located on the side of the mounting part 13 facing the suction bowl 12, and the first sealing ring 131 and the mounting part 13 are integrally formed of the same material. The first sealing ring 131 further seals the assembly gap between the mounting part 13 and the air pressure cover 21, thereby further enhancing the sealing between the breast pump 1 and the air pressure cover 21, ensuring normal breast pumping, and thus improving the breast pumping effect. Preferably, a plurality of first sealing rings 131 can be provided, and each first sealing ring 131 is distributed at intervals along the axial direction of the breast pump 1 in the mounting part 13.

[0046] On the other hand, in order to improve the sealing between the fitting cover 11 and the milk bowl 2, and to improve the fit between the fitting cover 11 and the human breast, such as Figure 5 As shown, the fitting cover 11 includes an integrally formed fitting outer cover 111 and a fitting inner cover 112. The fitting inner cover 112 is integrally formed with the suction bowl 12. The fitting outer cover 111 is located on the outer periphery of the fitting inner cover 112, and a deformation gap 113 is provided between the fitting inner cover 112 and the fitting outer cover 111. The opening diameter of the fitting inner cover 112 is smaller than the opening diameter of the fitting outer cover 111. When the user wears the breast pump, the fitting outer cover 111 fits against the chest wall and the base of the breast, and the fitting inner cover 112 fits against the tip of the breast, allowing the nipple to extend into the milk suction chamber 14 and be positioned within the suction chamber. The upper side of the unidirectional milk outlet structure 15 is designed to facilitate milk output. Furthermore, the inner cover 112, the mounting part 13, and the suction bowl 12 are integrally molded from the same material. In practical applications, the inner cover 112 fits snugly against the breast. The breast expands and contracts due to pressure differences within the milk suction chamber 14. The inner cover 112 expands or contracts under the force of the breast's expansion and contraction. By providing a deformation gap 113 between the inner cover 112 and the outer cover 111, the deformation gap 113 provides space for the expansion and deformation of the inner cover 112, thereby improving the user's comfort during milk expression.

[0047] Furthermore, such as Figure 3 and Figure 5As shown, the outer cover 111 includes a hard plastic cover 1111 integrally formed with the inner cover 112, a first soft plastic component 1112 integrally formed with the hard plastic cover 1111, and a second soft plastic component 1113 integrally formed with the hard plastic cover 1111. In the production process of the outer cover 111 in this embodiment, the inner cover 112 is integrally formed with the suction bowl 12. Then, the hard plastic cover 1111 is integrally formed with the inner cover 112. The hard plastic cover 1111 has a higher hardness than the inner cover 112, and provides support for the overall structure of the outer cover 111. Next, the first soft plastic component 1112 and the second soft plastic component 1113 are integrally formed with the hard plastic cover 1111. The hard plastic cover 1111 has a higher hardness than the first soft plastic component 1112 and the second soft plastic component 1113.

[0048] Furthermore, the hard plastic cover 1111 has a flange 1115 around its periphery facing the milk bowl 2, and the first soft plastic part 1112 is located on the outside of the flange 1115, such as... Figure 5 As shown, when worn by a user, the first soft rubber component 1112 conforms to the human chest wall and covers the flange 1115 and its surrounding area to improve the user's wearing comfort. The elastic pre-tightening force of the first soft rubber component 1112 also increases the friction between the fitting cover 11 and the human chest wall, thereby improving the wearing stability of the breast pump. The second soft rubber component 1113 is located on the inner side of the flange 1115 and forms a groove 1114 with the flange 1115. The milk bowl 2 has a retaining ring 25 that engages with the groove 1114. This snap-fit ​​structure enables a detachable connection between the fitting cover 11 and the milk bowl 2, facilitating cleaning of the milk bowl 2 and the assembly / disassembly of the breast pump 1 and the milk bowl 2. Furthermore, the elastic pre-tightening force of the second soft rubber component 1113 enhances the sealing connection between the air pressure cover 21 and the milk bowl 2, preventing milk leakage.

[0049] Optionally, the second soft rubber part 1113 has one or more second sealing rings 1116 on the side facing the slot 1114. The second sealing rings 1116 abut against the retaining ring 25. During assembly, the second sealing rings 1116 can close the assembly gap between the second soft rubber part 1113 and the milk bowl 2, and the elastic pre-tightening force of the second sealing rings 1116 applies a pushing force towards the flange 1115 to the milk bowl 2, thereby further improving the sealing connection between the fitting cover 11 and the milk bowl 2 and preventing milk leakage from the milk storage chamber 22. Optionally, the retaining ring 25 can be configured as a straight cylindrical structure or as an outwardly extending hook-shaped structure. The slot 1114 is correspondingly provided with the retaining ring 25 to facilitate improving the sealing connection between the fitting cover 11 and the milk bowl 2.

[0050] Optionally, the fitting inner cover 112, the mounting part 13, and the suction bowl 12 are integrally molded structures of the same material, which can be made of flexible materials such as food-grade liquid silicone or TPE. The hard plastic cover 1111 can be made of materials such as PP, PPSU, or PC. The first soft plastic part 1112 and the second soft plastic part 1113 can be made of the same material as the fitting inner cover 112.

[0051] On the other hand, in order to improve the suction efficiency of the negative pressure mechanism 3, the present invention also improves the connection structure between the negative pressure mechanism 3 and the air pressure hood 21, such as... Figure 2 As shown in Figure 5, the milk bowl 2 is provided with an air inlet pipe 23 communicating with the negative pressure chamber 211. A connector 24 is provided between the negative pressure mechanism 3 and the air inlet pipe 23. The connector 24 is provided with an air passage 241 that can conduct air between the negative pressure mechanism 3 and the air inlet pipe 23, so that the negative pressure mechanism 3 communicates with the negative pressure chamber 211. The connector 24 is made of a flexible material to make it elastic. The housing 4 is provided with a connecting part 41 that connects to the connector 24. One end of the connector 24 passes through the connecting part 41 and is sealed to the air inlet pipe 23, so that the negative pressure mechanism 3 communicates with the negative pressure chamber 211. Optionally, the connector 24 is made of a flexible material such as liquid silicone or TPE. The connector 24 is sealed to the air inlet pipe 23 by its own elastic pre-tightening force to prevent air leakage, thereby improving the suction efficiency of the negative pressure mechanism 3 and improving the milk suction effect.

[0052] Optional, such as Figure 3As shown, the milk bowl 2 has a mounting position 26 located on the upper side of the air pressure cover 21. The bottom wall 261 of the mounting position is located on the upper part of the air pressure cover 21. The side wall 262 of the mounting position is connected to the side of the bottom wall 261 of the mounting position near the hard plastic cover 1111. The side wall 262 of the mounting position and the hard plastic cover 1111 enclose each other to form a milk outlet channel communicating with the milk storage chamber 22. The top of the side wall 262 of the mounting position is provided with an outlet that communicates with the milk storage chamber 22. The milk inlet 20, the housing 4 is disposed at the mounting position 26, the negative pressure mechanism 3 can be disposed inside the housing 4 and located on the upper part of the bottom wall 261 of the mounting position, the air inlet pipe 23 is disposed on the upper part of the bottom wall 261 of the mounting position and communicates with the negative pressure chamber 211, the housing 4 is provided with a connecting part 41 through which the air inlet pipe 23 and the connecting member 24 can pass; further optionally, the connecting part 41 is provided with a through hole 411 through which the connecting member 24 passes and communicates with the... The lower part of the through hole 411 has a relief groove 412. The inner diameter of the through hole 411 is smaller than the inner diameter of the relief groove 412. A step portion 413 is formed around the periphery of the through hole 411 and the relief groove 412. The end of the connector 24 is provided with a mating portion 243 corresponding to the step portion 413 and an assembly hole 244 located inside the mating portion 243 and adapted to the air inlet pipe 23. During assembly, the connector 24 is detachably connected to the negative pressure mechanism 3 and the... Between the air inlet pipes 23, the connector 24 is detachably snapped into the connecting part 41 of the housing 4 through its mating part 243. The air inlet pipe 23 extends into the assembly hole 244 and connects to the air passage 241 to realize the connection between the negative pressure mechanism 3 and the negative pressure chamber 211. Since the connector 24 is elastic, the connector 24 and the connecting part 41 of the housing 4 are directly connected during assembly without the need for other tools. The structure is simple and easy to disassemble and assemble.

[0053] Optionally, one or more third sealing rings 245 are provided between the connector 24 and the air inlet pipe 23. The third sealing rings 245 are integrally formed with the connector 24 to further improve the airtightness between the connector 24 and the air inlet pipe 23.

[0054] In other embodiments, to improve the stability of the negative pressure environment inside the breast pump, a pressure relief branch pipe 242 is provided on one side of the connector 24. The air passage 241 extends into the pressure relief branch pipe 242, and the pressure relief branch pipe 242 is connected to a pressure relief valve 5. The pressure relief valve 5 helps to balance the pressure changes in the negative pressure chamber 211 and maintain the stability of the negative pressure in the negative pressure chamber 211, so as to ensure a smooth and efficient milk expression process. Preferably, the pressure relief branch pipe and the connector 24 are integrally formed to improve the overall airtightness of the connector 24 and simplify the assembly of the connector 24.

[0055] In other embodiments, the mounting portion 13 is located on the outer periphery of the suction cup 12. The mounting portion 13 extends away from the fitting cover 11, and the air pressure cover 21 extends towards the fitting cover 11 and is opposite to the bottom wall 261 of the mounting position. The air pressure cover 21 and the bottom wall 261 of the mounting position enclose a clamping space adapted to the mounting portion 13. During assembly, the breast suction cover 1 is sealed and snapped into the air pressure cover 21 through the mounting portion 13, and the mounting portion 13 is further clamped and fixed to the outer periphery of the air pressure cover 21 through the bottom wall 261 of the mounting position, so as to further improve the airtightness between the breast suction cover 1 and the air pressure cover 21.

[0056] The above examples are merely illustrative of the technical content of the present invention to facilitate easier understanding by the reader, but do not imply that the implementation of the present invention is limited to these examples. Any technical extensions or re-creations made based on the present invention are protected by the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A wearable breast pump, characterized in that, include: The housing (4) is provided with a negative pressure mechanism (3). The breast shield (1) includes an integrally formed fitting cover (11) and a suction bowl (12), which together form a breast suction cavity (14). Milk bowl (2), the milk bowl (2) is provided with an air pressure cover (21), the breast suction cover (1) is sealed to the air pressure cover (21), the suction bowl (12) extends into the air pressure cover (21) and surrounds the air pressure cover (21) to form a negative pressure chamber (211). The suction bowl (12) includes a first elastic structure (121) and a second elastic structure (122) disposed between the fitting cover (11) and the first elastic structure (121). The first elastic structure (121) elastically deforms in the negative pressure cavity (211) along the axial direction, and the second elastic structure (122) elastically deforms in the negative pressure cavity (211) along the radial direction.

2. The wearable breast pump of claim 1, wherein, The first elastic structure (121) includes a plurality of elastic peak layers (1211), any two elastic peak layers (1211) are connected by an arc, and the outer diameter of each elastic peak layer (1211) gradually decreases along the axial direction of the breast shield (1) away from the fitting shield (11).

3. The wearable breast pump of claim 1, wherein, The second elastic structure (122) includes a second elastic groove (1223), and the bottom wall (1224) of the second elastic groove undergoes elastic deformation radially within the negative pressure cavity (211); The bottom wall (1224) of the second elastic groove includes a first connecting wall (12241) connected to the fitting cover (11) and a second connecting wall (12242) disposed between the first connecting wall (12241) and the first elastic structure (121). There is a preset angle (1225) between the first connecting wall (12241) and the second connecting wall (12242).

4. The wearable breast pump of claim 3, wherein, The second elastic structure (122) also includes a plurality of arched walls (1221), each of the arched walls (1221) being distributed circumferentially on the periphery of the suction bowl (12), and the second elastic groove (1223) being provided between two adjacent arched walls.

5. The wearable breast pump of claim 4, wherein, Each of the arched walls (1221) is provided with a first elastic groove (1222) that is recessed toward the breast suction cavity (14).

6. The wearable breast pump of any one of claims 1-5, wherein, The negative pressure chamber (211) has a volume of 12 to 24 cubic centimeters.

7. The wearable breast pump of any one of claims 1-5, wherein, In the axial section of the suction bowl (12) and the air pressure hood (21), the ratio of the outer wall circumference of the suction bowl (12) to the inner wall circumference of the air pressure hood (21) is 90% to 99%.

8. The wearable breast pump of claim 1, wherein, The breast cup (1) further comprises a mounting portion (13) arranged between the fit cover (11) and the suction bowl (12), a one-way milk outlet structure (15) arranged between the mounting portion (13) and the fit cover (11), and a milk storage cavity (22) enclosed between the breast cup (1) and the milk bowl (2) and isolated from the negative pressure cavity (211), wherein the breast cup (1) is sealingly connected to the air pressure cover (21) through the mounting portion (13); and the one-way milk outlet structure (15) is provided with a one-way milk outlet channel from the breast cavity (14) to the milk storage cavity (22).

9. The wearable breast pump of claim 1, wherein, The fit cover (11) comprises a fit outer cover (111) and a fit inner cover (112), wherein the fit inner cover (112) is integrally formed with the suction bowl (12), the fit outer cover (111) is arranged on the outer circumferential side of the fit inner cover (112), and a deformation gap (113) is arranged between the fit inner cover (112) and the fit outer cover (111). The fit outer cover (111) comprises a hard rubber cover body (1111) integrally formed with the fit inner cover (112), a first soft rubber part (1112) integrally formed with the hard rubber cover body (1111), and a second soft rubber part (1113) integrally formed with the hard rubber cover body (1111), wherein the hard rubber cover body (1111) is provided with a flange (1115) facing the milk bowl (2) on the periphery, the first soft rubber part (1112) is arranged on the outer side of the flange (1115), the second soft rubber part (1113) is arranged on the inner side of the flange (1115) and forms a clamping groove (1114) with the flange (1115), the milk bowl (2) is provided with a clamping ring (25) matched with the clamping groove (1114), and the clamping ring (25) is sealingly connected in the clamping groove (1114).

10. The wearable breast pump of claim 1, wherein, The milk bowl (2) is provided with an air connection pipe (23) in communication with the negative pressure cavity (211), a connecting piece (24) is arranged between the negative pressure mechanism (3) and the air connection pipe (23), the connecting piece (24) is internally provided with an air passage (241) capable of conducting the negative pressure mechanism (3) and the air connection pipe (23), and the connecting piece (24) is made of flexible material. The shell (4) is provided with a connecting portion (41) connected with the connecting piece (24), one end of the connecting piece (24) penetrates through the connecting portion (41) and is sealingly connected with the air connection pipe (23), so that the negative pressure mechanism (3) is in communication with the negative pressure cavity (211).

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