Breast pump and breast pump valve assembly

Abstract

The present invention relates to a breast pump, in particular a breast pump and a breast pump valve assembly, each for squeezing milk. A breast pump valve assembly includes a first chamber for fluidly connecting to a negative pressure source; a second chamber defined between the first one-way valve and the second one-way valve, where the first one-way valve is configured to allow fluid to flow into the second chamber and the second one-way valve is configured to allow fluid to flow out of the second chamber; a fluid flow path between the second chamber and ambient atmosphere, the fluid flow path including a selectively openable third valve; and a displacement member fluidly separating the first chamber from the second chamber. The displacement member is configured such that application of negative pressure to the first chamber causes a first movement of the displacement member, thereby increasing the volume of the second chamber and drawing fluid into the second chamber through the first one-way valve. The displacement member is further configured such that when the pressure in the first chamber is equal to or greater than the pressure in the second chamber, the pressure in the first chamber causes a second movement of the displacement member, thereby reducing the volume of the second chamber. The third valve is configured to selectively open in response to the second movement of the displacement member such that the second movement of the displacement member directs fluid from the second chamber through the third valve.

Description

[0001] The present invention relates to a breast pump, in particular to a breast pump and a breast pump valve assembly, each of which is used for expressing milk. introduction

[0002] A breast pump, which is commonly used by mothers to express breast milk, generally comprises a breast receiving part for receiving the breast and nipple, also known as a breast shield or horn, and a pump for generating and applying suction. The breast receiving part is shaped so that the surface can contact the breast and form an airtight seal against the skin to ensure that suction is applied to the nipple within the breast receiving part.

[0003] Suction, also known as vacuum pressure, vacuum or negative pressure, is provided by a negative pressure source, such as a manual or electric pump. Manual breast pumps require the user to manually actuate a membrane or piston using a handle mounted to or on the breast receiving part. Electric breast pumps use an electric pump unit that is mounted to the breast receiving part, or remote from the breast receiving part, and is fluidly connected to the breast receiving part via a vacuum tube and connector.

[0004] The suction generated by both the manual pump and the electric pump is provided in pulses so that the suction is applied to the nipple in a cyclical manner. The suction stimulates breast milk to be expressed from the nipple, which flows out of the breast receiving part and is collected in a suitable container arranged in fluid communication.

[0005] A one-way valve is disposed between the breast receiving part and the container to control the flow of fluid (usually breast milk) into the container while preventing suction from the pump from being applied to the container. Within one suction cycle, the pump generates a pulse of suction within the breast receiving part before releasing or venting the suction to atmospheric pressure so that expressed breast milk can pass through the one-way valve to the container. Subsequent cycles repeat the pulsing and releasing process. In manual pumps, the rate and intensity of each cycle is controlled by the user, while electric pumps are electronically controlled using pre-programmed or manually adjusted settings.

[0006] A known problem with such breast pumps is that pumping efficiency is low due to the release of suction after each cycle, which requires repeated generation of suction from atmospheric pressure within the breast receiving part. Another disadvantage is that the release of suction causes stimulation of the nipple to cease, slowing down the overall rate of milk expression. A further disadvantage is that the release of suction may cause the airtight seal between the breast receiving part and the breast to fail, resulting in leakage, and requiring the user to maintain the breast pump positioned against the breast by applying pressure, which causes discomfort.

[0007] Another problem with some known breast pumps is that the collection of expressed milk is slow. The pulsating suction provided by the pump to provide effective expression of breast milk inhibits the expressed milk from flowing forward into the collection container. As a result, breast milk accumulates within the breast pump assembly because the breast milk is not transferred to the container within the suction cycle. A further disadvantage is that the accumulated breast milk may return to the breast receiving part, which also causes leakage and requires the user to keep the breast pump positioned against the breast by applying pressure, which causes discomfort.

[0008] Another problem with known breast pumps is that they require large pumping means capable of pumping large volumes of fluid. In particular, if the breast pump has a large residual volume between the breast receiving part and the container, the large volume of residual air must be pumped out to generate sufficient suction to initiate milk expression. This requires the pump to be a separate remote pump or, if integrated with the breast receiving part, to add considerable weight and bulk to the breast receiving part.

[0009] Therefore, it would be useful to provide a breast pump with improved efficiency. In particular, it would be useful to provide a breast pump that provides effective suction and improves the rate of milk expression. It would be useful to provide a breast pump that is easy for the user to wear.

[0010] It would also be useful to provide a breast pump that can effectively collect expressed breast milk. In particular, it would be useful to provide a breast pump that effectively collects breast milk while maintaining suction on the user's nipple.

[0011] Another object of the present invention is to provide a breast pump with improved comfort and reduced leakage for the user. SUMMARY OF THE INVENTION

[0012] As used herein, the term "fluid" refers to a gas, typically air, or a liquid, typically breast milk, or a mixture of gas and liquid. Unless expressly stated otherwise, a breast pump, valve assembly, or any component or part thereof described as being suitable for acting on a fluid is suitable for acting on gas, liquid, and a mixture of gas and liquid.

[0013] According to a first aspect of the present invention, there is provided a breast pump valve assembly, the breast pump valve assembly comprising: a first chamber, the first chamber being configured to be fluidly connected to a negative pressure source; a second chamber, the second chamber being defined between a first one-way valve and a second one-way valve, wherein the first one-way valve is configured to allow fluid to flow into the second chamber and the second one-way valve is configured to allow fluid to flow out of the second chamber, a fluid flow path between the second chamber and ambient atmosphere, the fluid flow path including a selectively openable third valve; and a displacement member fluidly separating the first chamber from the second chamber, wherein the displacement member is configured such that application of negative pressure to the first chamber causes a first movement of the displacement member, thereby increasing the volume of the second chamber and drawing fluid into the second chamber through the first one-way valve, wherein the displacement member is further configured such that when the pressure in the first chamber is equal to or greater than the pressure in the second chamber, the pressure in the first chamber causes a second movement of the displacement member, thereby reducing the volume of the second chamber; and Wherein the third valve is configured to selectively open in response to the second movement of the displacement member, such that the second movement of the displacement member directs fluid from the second chamber through the third valve.

[0014] Suitably, the displacement member is configured such that the second movement of the displacement member also directs fluid from the second chamber through the second non-return valve.

[0015] Suitably, the third valve is further configured to be selectively openable in response to the first movement of the displacement member, thereby drawing fluid into the second chamber through the third valve.

[0016] Suitably, the displacement member is configured to move between a neutral position when the first chamber is at atmospheric pressure and a displaced position when the first chamber is at a negative pressure.

[0017] Suitably, in the neutral position the displacement member substantially closes at least a portion of the second chamber.

[0018] Suitably, in the neutral position the displacement member blocks the fluid flow path.

[0019] Suitably, the displacement member is integrally formed with one or more of the first non-return valve, the second non-return valve or the third valve.

[0020] Suitably, the displacement member comprises a flexible diaphragm configured to deform upon application of negative pressure to the first chamber.

[0021] Suitably, at least one of the first non-return valve and the second non-return valve is a duckbill valve.

[0022] Suitably, the third valve is a slit valve, and preferably a domed cross-slit valve.

[0023] Suitably, the breast pump valve assembly further comprises a housing comprising a first housing member defining the second chamber and a second housing member defining the first chamber. More suitably, the displacement member is positioned between the first housing member and the second housing member.

[0024] Suitably, the breast pump valve assembly further comprises a fluid inlet, wherein the first one-way valve is configured to allow fluid to flow from the fluid inlet to the second chamber, and preferably the breast pump valve assembly further comprises an inlet port for fluidly coupling the inlet to a breast receiving part of a breast pump.

[0025] Suitably, the breast pump valve assembly further comprises a fluid outlet, wherein the second one-way valve is configured to allow fluid to flow from the second chamber to the outlet. More suitably, the valve assembly further comprises an outlet port for fluidly coupling the outlet to a fluid collection container.

[0026] Suitably, the breast pump valve assembly is further configured such that in response to a second movement of the displacement member, the fluid flow path directs air from the second chamber through the third valve.

[0027] Suitably, the fluid flow path is a recessed channel.

[0028] According to another aspect of the present invention, there is provided a breast pump valve assembly, the breast pump valve assembly comprising: a second chamber of variable volume, the second chamber defined between a first one-way valve and a second one-way valve, wherein the first one-way valve is configured to allow fluid to flow into the second chamber and the second one-way valve is configured to allow fluid to flow out of the second chamber; a third valve configured to provide a selectively openable fluid flow path between the second chamber and ambient atmosphere; and a displacement member configured to change the volume of the second chamber, wherein the displacement member is configured such that a first movement of the displacement member increases the volume of the second chamber to draw fluid into the second chamber through the first one-way valve; Therein, the third valve is configured to selectively open in response to the second movement of the displacement member to direct fluid from the chamber through the third valve.

[0029] Suitably, the displacement member is further configured such that the second movement of the displacement member reduces the volume of the second chamber.

[0030] Suitably, the breast pump valve assembly further comprises a first chamber, wherein the displacement member fluidly separates the first chamber from the second chamber.

[0031] Suitably, the breast pump valve assembly further comprises a vacuum port for fluidly connecting the first chamber to a source of negative pressure.

[0032] Suitably, the displacement member is configured such that application of negative pressure to the first chamber causes a first movement of the displacement member, thereby increasing the volume of the second chamber and drawing fluid into the second chamber through the first one-way valve.

[0033] Suitably, the displacement member is further configured such that when the pressure in the first chamber is equal to or greater than the pressure in the second chamber, the pressure in the first chamber causes the second movement of the displacement member.

[0034] Suitably, the breast pump valve assembly further comprises an actuator configured to operably move the displacement member to thereby vary the volume of the second chamber.

[0035] According to another aspect of the present invention, there is provided a breast pump, the breast pump comprising: a first chamber and a vacuum port for fluidly connecting the first chamber to a source of negative pressure; a breast receiving member, a fluid collection container, and a fluid flow path extending between the breast receiving member and the fluid collection container; a second chamber defined between the first one-way valve and the second one-way valve in the fluid flow path, wherein the first one-way valve is configured to allow fluid to flow from the breast receiving member into the second chamber and the second one-way valve is configured to allow fluid to flow from the second chamber to the fluid collection container, a fluid flow path between the second chamber and ambient atmosphere, the fluid flow path comprising a selectively openable third valve; and a displacement member fluidly separating the first chamber from the second chamber, wherein the displacement member is configured such that applying negative pressure to the first chamber causes a first movement of the displacement member, thereby increasing the volume of the second chamber and drawing fluid from the breast receiving part into the second chamber through the first one-way valve, wherein the displacement member is configured such that increasing the pressure in the first chamber toward atmospheric pressure causes a second movement of the displacement member, thereby decreasing the volume of the second chamber; and Therein, the third valve is configured to be selectively openable in response to the second movement of the displacement member to direct fluid from the second chamber through the third one-way valve.

[0036] Suitably, the displacement member is configured such that the second movement of the displacement member also directs fluid from the second chamber through the second one-way valve to the fluid collection container.

[0037] Suitably, the breast pump further comprises a source of negative pressure fluidly connected to the vacuum port.

[0038] It should be understood that any features described above with respect to the first aspect of the present invention may also be applicable to the second and third aspects of the present invention.

[0039] Certain examples provide a breast pump valve assembly that can improve breast pump efficiency compared to known breast pumps.

[0040] In particular, certain examples enable providing a breast pump having improved efficiency for expressing breast milk from a nipple because the breast pump can continuously apply suction to a nipple of a user.

[0041] In particular, certain examples enable a breast pump to have improved efficiency in collecting expressed breast milk in a container. This is because the breast pump is able to expel or displace a substantial portion or substantially all of the breast milk drawn into the breast pump valve assembly into the collection container. More specifically, the breast pump is able to expel or displace a substantial portion or substantially all of the breast milk drawn into the breast pump valve assembly into the collection container during each suction cycle.

[0042] Certain examples provide a breast pump valve assembly that offers improved user comfort compared to known breast pumps.

[0043] Certain examples provide a breast pump valve assembly capable of reducing leakage from a breast pump. In particular, certain examples provide a breast pump assembly that reduces leakage between the breast pump and a user's breast. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows a schematic diagram of a first known breast pump valve assembly of the prior art; Figure 2 Shown according to Figure 1 An exploded bottom perspective view of components of a breast pump valve assembly of a known configuration of an illustrative device; Figure 3 Shows Figure 2 An exploded perspective top view of components of a known breast pump valve assembly; Figure 4 Shows Figure 2 A cross-sectional view of a known breast pump valve assembly; Figure 5 Shown include Figure 2 A cross-sectional view of a breast pump with a known breast pump valve assembly; Figure 6 shows a perspective view of a second known breast pump valve; Figure 7 shows Figure 6 (a) top view and (b) bottom view of a cutaway perspective view of a known breast pump valve; Figure 8 The breast receiving member is shown mounted to the Figure 6 A perspective view of a known breast pump valve; Fig. 9 A third known example of a breast pump valve assembly comprising an alternative displacement member is shown; Fig.10 shows an exploded view of a fourth known breast pump valve assembly; Fig.11 Shows Fig.10 The lower member of a known breast pump valve assembly; Fig.12 Shows Fig.10 the underside of an upper member of a known breast pump valve assembly; Fig.13 Shows Fig.10 the underside of a support member of a known breast pump valve assembly; Fig.14 shows an exploded perspective top view of an exemplary breast pump valve assembly according to the present invention; Fig.15 Shows Fig.14 an exploded bottom perspective view of an exemplary breast pump valve assembly of; and Fig.16 Shown in assembled configuration Fig.14 A cross-sectional view of an exemplary breast pump assembly.

[0045] In the drawings, like reference numerals refer to like parts. Detailed Description

[0046] Certain terms are used in the following description for convenience only and are not limiting. The words "lower" and "upper" indicate directions referenced in the drawings with respect to the components described when assembled and installed. The words "inward", "inwardly" and "outwardly", "outwardly" refer to directions toward and away from, respectively, a designated centerline or geometric center (e.g., central axis) of the described elements, and their specific meanings are readily apparent from the context of the description.

[0047] Furthermore, unless otherwise indicated, the use of ordinal adjectives, such as "first," "second," "third," etc., merely indicates that different instances of similar objects are referenced and does not imply that the objects so described are necessarily in a given order temporally, spatially, sequentially, or in any other manner.

[0048] Prior art breast pump valve assembly Reference now Figure 1 , shows a schematic diagram of a known breast pump valve assembly 100, which includes: a suction chamber 104, the suction chamber 104 is used to be fluidly connected to a negative pressure source 103; and a fluid chamber 108, the fluid chamber 108 is defined between a first one-way valve 162 and a second one-way valve 164. The first one-way valve 162 is configured to allow fluid to flow into the fluid chamber 108. The second one-way valve 164 is configured to allow fluid to flow out of the fluid chamber 108.

[0049] The valve assembly 100 also includes a fluid inlet 120 and a fluid outlet 122. A first one-way valve 162 is positioned between the fluid inlet 120 and the fluid chamber 108 and is configured to allow fluid to flow from the fluid inlet 120 into the fluid chamber 108.

[0050] The valve assembly 100 also includes a displacement member 170 that is arranged to fluidly separate the suction chamber 104 from the fluid chamber 108. The displacement member 170 is configured such that applying negative pressure to the suction chamber 104 causes the displacement member 170 to move and thereby increase the volume of the fluid chamber 108, thereby drawing fluid (e.g., breast milk) into the fluid chamber 108 through the first one-way valve 162.

[0051] When the pressure in the suction chamber 104 becomes equal to or greater than the pressure in the fluid chamber 108, the displacement member 170 moves to reduce the volume of the fluid chamber 108. Therefore, the fluid in the fluid chamber 108 is directed out of the fluid chamber 108 through the second one-way valve 164, for example, toward a fluid collection container (not shown).

[0052] The displacement member 170 is configured to assume a neutral position when the pressure in the suction chamber 104 is substantially equal to or greater than the pressure in the fluid chamber 108. For example, when the suction chamber 104 is approximately at atmospheric pressure, the displacement member 170 assumes a neutral position. Then, when the suction chamber is under negative pressure, the displacement member 170 moves to the displacement position. When the pressure in the suction chamber 104 increases to be equal to or greater than the pressure in the fluid chamber, the displacement member 170 attempts to assume, i.e., return to, the neutral position.

[0053] The suction chamber 104 includes a vacuum port 124 configured for fluid connection to the negative pressure source 103. The vacuum port 124 is positioned such that the displacement member 170 moves toward the vacuum port 124 when negative pressure is applied to the suction chamber 104.

[0054] In this way, it is expected that when the pressure in the suction chamber 104 increases to equal or greater than the pressure in the fluid chamber, the displacement member 170 of the known valve assembly will return to the neutral position. This is to ensure that most or substantially all of the fluid is removed from the fluid chamber 108 via the second one-way valve 164.

[0055] However, the inventors of the present invention have found that, in practice, it is difficult to ensure that most or substantially all of the fluid is removed from the fluid chamber 108. The second one-way valve 164 is configured to allow fluid to flow from the fluid chamber 108 to the fluid outlet 122. In this example, the second one-way valve is positioned between the fluid chamber 108 and the fluid outlet 122.

[0056] Figures 2 to 5 Shows Figure 1 1 is a first known example configuration of a valve assembly 100. In this example, the valve assembly 100 includes a housing having a first housing member 130 and a second housing member 110. In this example, the first housing member is an upper member 130 and the second housing member is a lower member 110. The upper member 130 generally defines a fluid chamber 108. The lower member 110 generally defines a suction chamber 104. A displacement member 170 is positioned between the upper member 130 and the lower member 110, thereby fluidically separating the suction chamber 104 from the fluid chamber 108.

[0057] In this example, the first and second one-way valves 162 , 164 and the displacement member 170 are arranged along the longitudinal axis of the support member 150 .

[0058] In this example, the lower member 110 includes a first opening defining a fluid inlet 120 , a second opening defining a fluid outlet 122 , and a third opening defining a vacuum port 124 .

[0059] In this example, the lower member 110 is provided as a plate-like member having an upper surface 111 and a lower surface 112 (or an inner surface and an outer surface).

[0060] The fluid inlet 120 , the fluid outlet 122 , and the vacuum port are disposed through the lower member 110 and are arranged along the longitudinal axis of the lower member 110 .

[0061] The inlet 120 comprises an inlet port for fluidly coupling the inlet to a breast receiving part of a breast pump.

[0062] The outlet 122 includes an outlet port for fluidly coupling the outlet to a fluid collection container, and the outlet is configured for attachment to a tube or other fluid pathway extending to the fluid collection container.

[0063] The vacuum port 124 is configured for fluid connection to a vacuum source or negative pressure source (eg, a pump).

[0064] In this example, the upper member 130 is provided as a plate-like member having an upper surface 131 and a lower surface 132 (or an outer surface and an inner surface). The cavity 137 defines at least a portion of the fluid chamber 108 between the first and second one-way valves 162 and 164 .

[0065] A recess 144 is provided in the lower surface 132 of the first end portion 134. The recess 144 is sized and shaped to accommodate a first one-way valve 162 (eg, Figure 3 as shown).

[0066] In this example, the support member 150 is positioned between the upper member 130 and the lower member 110. The support member 150 includes a displacement member 170, a first check valve 162, and a second check valve 164. In this way, the displacement member 170 is integrally formed with the first check valve 162 and the second check valve 164.

[0067] The support member 150 includes a first surface 151 facing the upper member 130 and a second surface 152 facing the lower member. An edge portion 159 extends around the support member 150, and the support member 150 can be sandwiched between the inner surface 132 of the upper member 130 and the inner surface 111 of the lower member 110.

[0068] The support member 150 includes a first opening 161 configured to be aligned with the fluid inlet 120. The first opening 161 is provided with a first one-way valve 162 adapted to selectively allow fluid to pass through the first opening 161.

[0069] In this example, the first one-way valve 162 is a duckbill valve that includes a pair of mutually opposing inclined walls extending from the first surface 151 of the displacement member 150 , the pair of inclined walls being angled to meet at a first ridge parallel to and away from the first surface 151 .

[0070] As is known in the art, a slit is provided along and through the first ridge, the slit being adapted to move between an open position and a closed position in response to a pressure differential across the mutually opposing inclined walls. In this manner, the first one-way valve 162 is configured to allow fluid to pass through the first opening 161 in a direction from the second surface 152 to the first surface 151, while preventing fluid from passing in the opposite direction.

[0071] The support member 150 includes a second opening 163 configured to be aligned with the fluid outlet 122. The second opening 163 is provided with a second one-way valve 164 adapted to selectively allow fluid to pass through the second opening 163.

[0072] In this example, the second one-way valve 164 is a duckbill valve.

[0073] The support member 150 also includes a displacement member 170 , which in this example is a flexible membrane. The flexible membrane 170 is configured to deform when negative pressure is applied to the suction chamber 104 .

[0074] Diaphragm 170 is positioned so that it aligns with recess 119 on lower member 110 and cavity 137 in upper member 136. In this manner, diaphragm 170 is configured to fluidly separate recess 119 (forming suction chamber 104) from cavity 137 (forming at least a portion of fluid chamber 108).

[0075] The diaphragm 170 is shaped to correspond to the cavity 137 in the upper member 130. In this way, in the neutral position, the diaphragm 170 is intended to abut against the inner surface of the cavity, thereby minimizing the volume of the fluid chamber 108 as much as possible and ensuring that substantially all of the fluid can be discharged from the fluid chamber 108. However, in practice, it is difficult to ensure that most or substantially all of the fluid is discharged from the fluid chamber 108.

[0076] The diaphragm 170 is disposed in the central portion 158 of the support member 150. The diaphragm 170 can include a base 172 that is recessed from the second surface 152 by an angled wall 174 that extends therearound.

[0077] Features of the support member 150 are configured to engage with corresponding features of the upper member 110 and the lower member 130 .

[0078] The outer edge portion 159 and the inner edge portion 182 of the support member 150 are shaped to be clamped between the upper member 130 and the lower member 110 when coupled to form the housing. When clamped, the support member 150 divides the housing to form a fluid chamber 108 between the support member 150 and the upper member 130, and a suction chamber 104 between the displacement member 170 of the support member 150 and the lower member 110.

[0079] The first check valve 162 covers the inlet 120 and selectively allows fluid to enter the housing from the fluid inlet 120 .

[0080] The second check valve 164 covers the outlet 122 and selectively allows fluid to exit the housing through the fluid outlet 122 .

[0081] The diaphragm 170 abuts against the lower surface 132 of the upper member 130 .

[0082] The fluid chamber 108 is provided by a volume defined between the upper member 130 and the first side 151 of the support member 150 , which is defined by the outer edge portion 159 being sandwiched between the upper member 130 and the lower member 110 .

[0083] As long as the pressures in the fluid chamber 108 and the suction chamber 104 are equal, the diaphragm 170 is intended to remain in the neutral position.

[0084] The diaphragm 170 is configured to respond to negative pressure provided to the suction chamber 104. In use, negative pressure may be introduced into the suction chamber 104 via the vacuum port 124 using any suitable source of negative pressure, such as a manual or electric pump.

[0085] In a first cycle, negative pressure is applied within the suction chamber 104 to deform the diaphragm 170 , thereby reducing the volume of the suction chamber 104 and expanding the volume of the fluid chamber 108 .

[0086] As the volume of the fluid chamber 108 increases, the pressure in the fluid chamber 108 decreases, thereby generating a pressure differential across the first check valve 162. Due to the pressure differential, the first check valve 162 opens to draw fluid from the fluid inlet 120 into the fluid chamber 108.

[0087] As the negative pressure increases, the diaphragm 170 further deforms, moving further away from the central portion 138 of the upper housing 130. The negative pressure in the suction chamber 104 increases until the first cycle reaches a maximum negative pressure. At the maximum negative pressure, the diaphragm 170 is in a displaced position. In the displaced position, the volume of the fluid chamber 108 is at a maximum value and the volume of the suction chamber 104 is at a minimum value.

[0088] To complete the first cycle, the negative pressure in the suction chamber 104 is released, allowing the diaphragm 170 to attempt to return to its undeformed neutral shape. Thus, the diaphragm 170 attempts to move back to its neutral position, in which a portion of the fluid chamber 108 is substantially closed. Referring now to Figure 5 , showing a breast pump 190 suitable for expressing breast milk, the breast pump 190 comprising Figures 2 to 4 A valve assembly 100 of an example is shown.

[0089] The breast pump 190 also includes a breast receiving part 192 (e.g., a breast horn), a fluid collection container (not shown), and a fluid flow path extending between the breast receiving part 192 and the fluid collection container. The fluid flow path extends through the valve assembly 100, wherein the first one-way valve 162 and the second one-way valve 164 are disposed in the fluid flow path. The valve assembly 100 is configured substantially the same as the valve assembly 100 described above, wherein the fluid chamber 108 is defined between the first one-way valve 162 and the second one-way valve 164.

[0090] Thus, the first one-way valve 162 is configured to allow fluid (e.g., breast milk) to flow from the breast receiving member 192 into the fluid chamber 108, and the second one-way valve 164 is configured to allow fluid (e.g., breast milk) to flow from the fluid chamber 108 to the fluid collection container. In this way, a fluid flow path is provided from the nipple receiving portion 194 via the fluid chamber 108 of the valve assembly to the fluid collection container.

[0091] The breast receiving member 192 includes a nipple receiving portion 194 and a breast contacting portion 195 configured to engage with a user's breast. The nipple receiving portion 194 is configured as a substantially cylindrical cup, appropriately sized to receive a user's nipple. The breast contacting portion 192 is configured as a substantially spherical dome, appropriately sized to contact the skin around the user's nipple when the nipple is placed in the nipple receiving portion 194. A first end of the nipple receiving portion 194 opens into the center of the breast contacting portion 192 to receive the nipple. A second end of the nipple receiving portion 194 includes an opening 196 adapted to allow fluid (such as air or expressed milk) to flow out therefrom.

[0092] To use the breast pump 190, the user places the breast horn 192 against the user's breast so that the user's nipple is received in the nipple receiving portion 194. The nipple is received until the breast contacting portion 192 engages the skin around the nipple, thereby forming a substantially airtight seal around the open end of the nipple receiving portion 194.

[0093] The user activates the negative pressure source, so that the first negative pressure cycle begins as described above. The negative pressure in the fluid chamber 108 provides a pressure difference across the first one-way valve 162, allowing the first one-way valve 162 to open and draw fluid from the nipple receiving portion 194 and apply negative pressure to the user's nipple, thereby stimulating the expression of breast milk.

[0094] Fluid, including expressed breast milk, is drawn into the valve assembly 100 from the nipple receiving portion 194 by the negative pressure of the fluid chamber 108. When the diaphragm 170 reaches its displaced position, the negative pressure in the suction chamber 104 is released, allowing the pressure in the suction chamber 104 to return to atmospheric pressure, thereby allowing the diaphragm to return to its neutral position.

[0095] The initial pressure release in the suction chamber 104 causes the diaphragm 170 to attempt to return to its undeformed shape. As a result, the diaphragm 170 attempts to move toward its neutral position and reduce the volume of the fluid chamber 108. However, in practice, only a portion of the fluid can be discharged from the fluid chamber 108 through the outlet 122 before the negative pressure in the suction chamber 104 returns to atmospheric pressure.

[0096] Reference now Figures 6 to 8 , a second known example breast pump valve assembly 200 is shown. Figures 6 to 8 The example shown is similar to Figures 1 to 5 The first known example is shown, except that the first check valve 262 and the displacement member 270 are arranged along a first axis, and the second check valve 264 and the displacement member 270 are arranged along a second axis arranged perpendicular to the first axis.

[0097] In this example, the assembly 200 includes a suction chamber and a fluid chamber defined between a first one-way valve 262 and a second one-way valve 264. The valve assembly 200 also includes a displacement member 270, which is arranged to fluidically separate the suction chamber from the fluid chamber and is configured such that applying negative pressure at the beginning of a first cycle of negative pressure causes the displacement member 270 to move, thereby increasing the volume of the fluid chamber and sucking liquid into the fluid chamber through the first one-way valve 262.

[0098] To complete the first cycle, the negative pressure in the suction chamber is released, allowing the displacement member 170 to attempt to return to its undeformed neutral shape.

[0099] The valve assembly 200 includes a housing including an upper member 230 and a lower member 210, and a support member 250 positioned between the upper member 230 and the lower member 210. Compared with the first example, the lower member 210 is provided as an L-shaped plate-like piece having an upper surface and a lower surface.

[0100] The fluid inlet 220 and the vacuum port 224 are arranged along a first axis, and the fluid outlet 222 and the vacuum port are arranged along a second axis arranged perpendicular to the first axis.

[0101] Reference now Figure 8 , shows a known arrangement of a second known valve assembly 200 mounted to a breast trumpet 292. The breast trumpet 292 includes a nipple receiving portion 296 and a breast contacting portion 295 that is shaped and configured to engage with a nipple. Figure 5 The breast horn 192 of the nipple receiving portion engages the user's breast in the same manner. The first end of the nipple receiving portion includes an opening adapted to allow fluid (such as air or expressed milk) to flow therefrom.

[0102] The valve assembly 200 and breast horn may be included in a breast pump (not shown) that includes a source of negative pressure and used in the same manner as the breast pump 290 described above.

[0103] Reference now Fig. 9 , a third known example valve assembly 300 is shown. The example shown is similar to reference Figure 1 The example described above differs in that the displacement member includes a reciprocating member that is biased to substantially close the fluid chamber 308. The reciprocating member may be in the form of a piston 370 that is configured to reciprocate within the fluid chamber 308 in the direction of arrow A. A spring 390 or other suitable biasing element biases the piston to substantially close the fluid chamber 308.

[0104] When negative pressure is applied to the suction chamber 304 via the vacuum port or inlet 324, the piston 370 slides to reduce the volume of the suction chamber 304 and increase the volume of the fluid chamber 308. The pressure in the fluid chamber 308 is thereby reduced, thereby opening the first one-way valve 362 to draw fluid from the fluid inlet 320 into the fluid chamber 308.

[0105] When the negative pressure in the suction chamber 304 is released, the suction chamber returns to atmospheric pressure and the biasing element 390 acts to attempt to move the piston 370 to increase the volume of the suction chamber 304 and decrease the volume of the fluid chamber 308 .

[0106] Figures 10 to 13 Shows Figure 1 A fourth known example configuration of a valve assembly 100 of FIG. Where features are identical to the first example, the reference numerals are identical except that the initial numeral is "13". Figures 10 to 12 The example shown is similar to Figures 1 to 5 The first known example is shown, but the first one-way valve 1362 is positioned adjacent to the second one-way valve 1364. The fluid chamber 108 includes a first fluid flow channel 1339 between the first one-way valve 1262 and the cavity 1337. The fluid chamber 108 also includes a second fluid flow channel 1340 between the cavity 1337 and the second one-way valve 1364.

[0107] In this example, the valve assembly 1300 includes a housing having a first housing member 1330 and a second housing member 1310. The second housing member is an upper member 1310, and the first housing member is a lower member 1330. The lower member 1330 generally defines a fluid chamber 108. The upper member 1310 generally defines a suction chamber 104. A displacement member 1370 is positioned between the upper member 1310 and the lower member 1330, thereby fluidly separating the suction chamber 104 from the fluid chamber 108.

[0108] In this example, upper member 1310 includes a first opening defining a fluid inlet 1320 and a second opening defining a vacuum port 1324. Vacuum port 1324 may be fluidly coupled to any suitable vacuum source as described herein.

[0109] The fluid inlet 1320 may suitably comprise an inlet port for fluidly coupling the inlet to a breast receiving part of a breast pump.

[0110] In this example, support member 1350 is positioned between upper member 1310 and lower member 1330 .

[0111] The support member 1350 includes a first opening 1361 configured to align with the fluid inlet 1320 in the upper member 1310. The first opening 1361 is provided with a first one-way valve 1362 adapted to selectively allow fluid to enter the fluid chamber 108 through the first opening 1361.

[0112] In this example, the first check valve 1362 (see Fig.13 ) is a duckbill valve extending from the second surface 1352 of the displacement member 1350. The duckbill valve functions the same as the other duckbill valves described herein.

[0113] The support member 1350 includes a second opening 1363 configured to align with the fluid outlet 1322 in the lower member 1330. The second opening 1363 is provided with a second one-way valve 1364 adapted to selectively allow fluid to pass through the fluid outlet 1322.

[0114] In this example, the second one-way valve 1364 is a duckbill valve extending from the second surface 1352 of the support member 1350. The duckbill valve functions the same as the other duckbill valves described herein. In this example, both the first one-way valve and the second one-way valve extend in the same direction.

[0115] The support member 1350 also includes a displacement member 1370 , which in this example is a flexible diaphragm configured to deform when negative pressure is applied to the suction chamber 104 .

[0116] Features of support member 1350 are configured to engage with corresponding features of upper member 1310 and lower member 1330 .

[0117] Fig.11 A detailed perspective view of the lower member 1330 is shown, also showing in detail the fluid chamber 1337 and the flow channel. The lower member 1330 includes a first fluid well 1338. The first fluid well 1338 is configured to align with and accommodate at least a portion of the fluid inlet valve 1362 of the support member 1350. Thus, in use, fluid enters the fluid well 1338 from the fluid inlet valve 1362.

[0118] Lower member 1330 also includes a first fluid flow channel 1339 extending from fluid well 1338 to fluid cavity 1337. In this manner, fluid well 1338 is fluidly coupled to fluid cavity 1337 via first fluid flow channel 1339. Second fluid flow channel 1340 extends from fluid cavity 1337 toward fluid outlet 1322.

[0119] In use, at the beginning of a first cycle of negative pressure, the diaphragm 1370 is displaced (by a suitable vacuum source) toward the upper member 1310, causing fluid (i.e., breast milk) to be drawn into the main fluid chamber 108 via the first one-way valve 1362, into the fluid well 1338, and into the fluid chamber 1337 along the first fluid flow channel 1339. To complete the first cycle, the negative pressure in the suction chamber is released, allowing the diaphragm 1370 to attempt to return to its undeformed neutral shape. As a result, the diaphragm 1370 attempts to move back to its neutral position, in which a portion of the fluid chamber is substantially closed.

[0120] Breast pump valve assembly of the present invention Reference now Figures 14 to 16 , shows an example configuration of a breast pump valve assembly 1400 according to the present invention. The valve assembly 1400 comprises a housing having a first housing member and a second housing member. The first housing member is an upper member 1410 and the second housing member is a lower member 1430.

[0121] The upper member 1410 generally defines a first chamber 1404. The first chamber 1404 is substantially as described herein with reference to Figures 1 to 13 In this manner, the first chamber 1404 is configured to be fluidly connected to a negative pressure source, such as any of the negative pressure sources described herein.

[0122] Lower member 1430 generally defines second chamber 1408. Second chamber 1408 is substantially as described herein with reference to Figures 1 to 13 In this manner, the second chamber 1408 is defined between the first one-way valve 1462 and the second one-way valve 1464, wherein the first one-way valve 1462 is configured to allow fluid to flow into the second chamber 1408 and the second one-way valve 1464 is configured to allow fluid to flow out of the second chamber 1408.

[0123] The displacement member 1470 is positioned between the upper member 1410 and the lower member 1430 to fluidly separate the first chamber 1404 from the second chamber 1408. That is, the displacement member 1470 ensures that the first chamber 1404 is isolated from the second chamber 1408 so that in use, fluid cannot move between the first chamber 1404 and the second chamber 1408.

[0124] The displacement member 1470 is configured such that application of negative pressure to the first chamber 1404 causes a first movement of the displacement member 1470 , thereby increasing the volume of the second chamber 1408 and drawing fluid into the second chamber 1408 through the first one-way valve 1462 .

[0125] The displacement member 1470 is also configured such that when the pressure in the first chamber 1404 is equal to or greater than the pressure in the second chamber 1408 , the pressure in the first chamber 1404 causes a second movement of the displacement member 1470 , thereby reducing the volume of the second chamber 1408 .

[0126] The breast pump valve assembly 1400 further comprises a fluid flow path between the second chamber 1408 and the ambient atmosphere. The fluid flow path comprises a selectively openable third valve 1466. Suitably, the ambient atmosphere is the atmosphere surrounding the breast pump.

[0127] In this example, upper member 1410 includes a first opening defining a fluid inlet 1420 and a second opening defining a vacuum port 1424. Vacuum port 1424 may be fluidly coupled to any suitable vacuum source as described herein.

[0128] The fluid inlet 1420 may suitably comprise an inlet port for fluidly coupling the fluid inlet 1420 to a breast receiving part of a breast pump.

[0129] In this example, the lower member 1430 is configured as a cover for coupling to an opening of a fluid collection container (not shown). Although various cover configurations are possible, in this example, the lower member 1430 includes an annular wall 1402 that includes a threaded radial inner surface 1428. In this manner, the lower member 1430 can be directly coupled to the open neck of the fluid collection container via a threaded interface to form a fluid tight connection. This configuration allows fluid to enter the fluid collection container directly from the fluid outlet 1422 without the need for an intermediate fluid path or tube, which may be difficult for the user to clean.

[0130] The lower member 1430 includes a third opening defining a vent port 1481. When the lower member 1430 is coupled to the fluid collection container, the vent port 1481 vents air from the fluid collection container to the ambient atmosphere. In this way, when expressed breast milk is collected in the fluid collection container, any excess pressure is released through the secondary vent port 1481.

[0131] In this example, the lower member 1430 includes a cavity 1437 that defines at least a portion of the second chamber 1408 between the first one-way valve 1462 and the second one-way valve 1464. In this example, the cross-section of the cavity 1437 is circular. However, it should be understood that other cavity shapes may also be suitable.

[0132] The lower member 1430 includes a first fluid well 1438. The first fluid well 1438 is configured to align with and receive at least a portion of a fluid inlet valve 1462 of the support member 1450. Thus, in use, fluid enters the first fluid well 1438 from the fluid inlet valve 1462.

[0133] The lower member 1430 also includes a first fluid flow channel 1439 extending from the first fluid well 1438 to the fluid cavity 1437. In this manner, the first fluid well 1438 is fluidly connected to the fluid cavity 1437 via the first fluid flow channel 1439.

[0134] The second fluid flow channel extends from the fluid cavity 1437 through the lower member 1430 toward the fluid outlet 1422. In this example, the fluid outlet 1422 is a tube portion extending from the lower side of the lower member 1430. A valve element 1465 including a second one-way valve 1464 is mounted to the fluid outlet 1422. The second one-way valve 1464 is a duckbill valve disposed on the fluid outlet 1422 of the support member 1450. The function of the duckbill valve is the same as the other duckbill valves described herein. The valve element 1465 can be mounted to the lower member and can be removed from the lower member. This allows the valve element to be easily cleaned.

[0135] Special reference Fig.16 , showing the Fig.14 14. A cross-sectional view of the lower member 1430 of plane XX shown in FIG. The lower member 1430 includes a third fluid well 1488. The third fluid well 1488 is configured to align with and accommodate at least a portion of the third valve 1466 of the support member 1450.

[0136] The lower member 1430 also includes a third fluid flow channel 1489 extending from the fluid chamber 1437 to the third fluid well 1488. In this manner, the third fluid well 1488 is fluidly connected to the fluid chamber 1437 via the third fluid flow channel 1489. The third valve 1466, the third fluid well 1488, and the third fluid flow channel 1489 together form a fluid flow path from the second chamber 1408 and the ambient atmosphere.

[0137] Suitably, the third fluid flow channel 1489 is a recessed channel provided in the wall of the fluid cavity 1437 of the lower member 1430 .

[0138] Suitably, the third fluid flow channel 1489 is configured to restrict or constrain the flow of liquid therethrough. For example, when formed as a recessed channel, the width of the recessed channel may be narrow enough so that the flow of liquid (e.g., breast milk) is restricted or constrained due to friction between the liquid and the inner wall of the channel. Thus, these dimensions may selectively allow air to be directed along the third fluid flow channel.

[0139] In this example, the support member 1450 is positioned between the upper member 1410 and the lower member 1430. The support member 1450 includes a displacement member 1470 and a first one-way valve 1462. In this way, the displacement member 1470 and the first one-way valve 1462 are integrally formed.

[0140] The support member 1450 includes a first surface 1451 facing the upper member 1410 and a second surface 1452 facing the lower member 1430. The support member 1450 includes a first opening 1461 configured to align with the fluid inlet 1420 in the upper member 1410. The first opening 1461 is provided with a first one-way valve 1462, which is adapted to selectively allow fluid to enter the second chamber 1408 through the first opening 1461.

[0141] In this example, the first one-way valve 1462 is a duckbill valve that extends from the second surface 1452 of the displacement member 1450. The duckbill valve functions the same as the other duckbill valves described herein.

[0142] The support member 1450 includes a third valve 1466 that is configured to align with the exhaust port 1429 in the upper member 1410. In this example, the third valve 1466 is fluidly connected to the second chamber 108 through the third fluid well 1488 and the third fluid flow channel 1489. Therefore, the third valve 1466 is configured to be selectively openable to allow fluid to pass from the second chamber 108 to the ambient atmosphere. In addition, the third valve 1466 is configured to be selectively openable to allow fluid from the ambient atmosphere to be drawn into the second chamber 108.

[0143] In the example shown, the third valve 1466 is a slit through the support member 1450. The third valve 1466 is configured to selectively open in response to a pressure differential between the first surface 1451 and the second surface 1452 near the third valve 1466. That is, the third valve 1466 is biased closed and opened by a pressure differential between opposing surfaces of the third valve 1466. The third valve 1466 is configured to open when the pressure differential between the opposing surfaces provides a greater pressure on the surface of the third valve 1466 adjacent to the first surface 1451 of the support member 1450. Suitably, the third valve 1466 can be configured to open when the pressure differential between the opposing surfaces of the third valve 1466 provides a greater pressure on the surface of the third valve adjacent to the second surface 1452 of the support member 1450.

[0144] In this example, the third valve 1466 includes a slit in a recessed dome that is recessed away from the first surface 1451. In this manner, the pressure differential required to open the third valve 1466 to allow fluid to pass from the second chamber 108 to the ambient atmosphere is less than the pressure differential required to open the third valve 1466 to allow fluid to pass from the ambient atmosphere to the second chamber 108. However, it should be understood that the third valve 1466 can be configured such that the pressure differential required to open the third valve is equal to the pressure differential at which it opens to allow fluid to pass in either direction. Alternatively, the third valve can be configured such that the pressure differential required to open the third valve 1466 to allow fluid to pass from the second chamber 108 to the ambient atmosphere is greater than the pressure differential required to open the third valve 1466 to allow fluid to pass from the ambient atmosphere to the second chamber 108.

[0145] The support member 1450 also includes a displacement member 1470 , which in this example is a flexible membrane. The displacement member 1470 is configured to deform when negative pressure is applied to the first chamber 104 .

[0146] The displacement member 1470 is positioned so that the displacement member 1470 is aligned with the cavity 1437 in the lower member 1430 and the vacuum port 1424 in the upper member 1410. In this manner, the displacement member 1470 is configured to fluidly separate the first chamber 1404 defined between the displacement member 1470 and the upper member 1410 from the second chamber 108 defined between the cavity 1437 and the displacement member 1470. The upper member 1410 includes an annular sealing ring or abutment ring 1412 that is configured to provide a fluid-tight seal around the edge of the displacement member 1470. In this manner, a substantially fluid-tightly sealed first chamber 104 is provided between the upper member 1410 and the displacement member 1470.

[0147] The displacement member 1470 can be appropriately shaped to correspond to the cavity 1437 in the lower member 1430. In this way, in the neutral position, the displacement member 1470 can abut against the inner surface of the cavity 1437, thereby minimizing the volume of the second chamber 1408 as much as possible and ensuring that substantially all fluid can be discharged therefrom.

[0148] Suitably, in the neutral position, the displacement member blocks the fluid flow path. That is, in the neutral position, the displacement member 1470 covers the opening to the third fluid flow channel. Fluid cannot flow from the second chamber 1408 to the third valve 1466, or vice versa.

[0149] The lower member includes a sealing abutment or sealing ring 1425 extending around the fluid cavity 1437, the first fluid well 1438, the third fluid well 1488, and the first fluid flow channel 1439 and the third fluid flow channel 1489. The sealing abutment or sealing ring 1425 is configured to releasably couple the support member 1450 and the upper member 1410 to the lower member 1430 to form a complete valve housing, wherein the support member 1450 is positioned between the upper member 1410 and the lower member 1430. Each of the upper member 1410 and the lower member 1430 is adapted to be releasably coupled together to form a complete housing.

[0150] When formed into a complete housing, the second surface of the support member 1450 is held against the lower member 1410 by the upper member 1410 to provide a seal between the second surface 1452 of the support member 1450 and the lower member 1430. Optionally, a cover member (not shown) can be releasably coupled to the lower member 1410 to bear against the upper surface of the upper member 1410 and lock the support member 1450 against the lower member 1430 in its sealed position.

[0151] In use, any suitable source of negative pressure (e.g., a manual or electric pump) may be used to introduce negative pressure into the first chamber 1404 via the vacuum port 1424. As is known in the art, the negative pressure source may provide pulses or cycles of negative pressure. Thus, the breast pump valve assembly 1400 provides pulses or cycles of negative pressure to the breast receiving part of the breast pump.

[0152] The negative pressure cycle includes a first part and a second part.

[0153] During the first portion of the negative pressure cycle, the application of negative pressure within the first chamber 1404 deforms the displacement member 1470, thereby reducing the volume of the first chamber 1404. That is, when negative pressure is applied to the first chamber 1404, the volume of the second chamber 1408 is thereby increased by the first movement of the displacement member 1470. The displacement member 1470 moves away from the lower member 1410.

[0154] As the volume of the second chamber 1408 increases, the pressure in the second chamber 1408 decreases, thereby generating a pressure differential across the first one-way valve 1462. Due to the pressure differential, the first one-way valve 1462 opens to draw fluid from the fluid inlet 1420 into the second chamber 1408.

[0155] As the negative pressure increases, the displacement member 1470 further deforms and moves further away from the lower housing 1410. The negative pressure in the first chamber 1404 increases until the first cycle reaches a maximum negative pressure. At the maximum negative pressure, the displacement member 1470 is in a displaced position. In the displaced position, the volume of the second chamber 1408 is at a maximum value, and the volume of the first chamber 1404 is at a minimum value.

[0156] During the second part of the negative pressure cycle, the negative pressure in the first chamber 1404 is released, causing the pressure in the first chamber 1404 to return to ambient pressure. Air from the ambient atmosphere is exhausted into the first chamber 1404 through the vacuum port 1424, balancing the pressure between the first chamber and the ambient atmosphere. Therefore, the pressure in the first chamber 1404 is greater than the pressure in the second chamber 1408. The displacement member 1470 thereby attempts to return to its undeformed neutral shape, increasing the pressure of the fluid that has been drawn into the second chamber 1408.

[0157] Thus, releasing the negative pressure from the first chamber 1404 initiates a second movement of the displacement member 1470 from its displacement position toward its neutral position. Thus, the displacement member 1470 attempts to move back to its neutral position, in which a portion of the second chamber 1408 is substantially closed.

[0158] In the absence of negative pressure in the first chamber 1404, the displacement member 1470 is biased toward the neutral position. Thus, the second movement increases the pressure applied to the fluid that has been drawn into the second chamber 1408. Typically, the release of the negative pressure results in a sudden pressure increase, and the increased pressure is applied to the fluid that has been drawn into the second chamber 1408.

[0159] The third valve 1466 is configured to selectively open in response to the second movement of the displacement member 1470. That is, the third valve opens in response to an increase in the pressure applied to the fluid drawn into the second chamber 1408. Therefore, the fluid from the second chamber 1408 is guided through the third valve 1466 via the third fluid flow channel 1489 and the third fluid well 1488. In this way, the initial pressure applied to the fluid in the second chamber 1408 is released by the fluid passing through the third valve 1466. Thus, the displacement member 1470 moves toward the neutral position with the resistance of the fluid in the second chamber 1408 reduced.

[0160] In this example, in the neutral position, the lower surface of the displacement member 1470 abuts a portion of the wall of the cavity 1437. The fluid outlet 1422 of the lower member includes a longitudinal axis. The base 1472 of the displacement member 1470 is aligned with the longitudinal axis of the fluid outlet 1422. Therefore, movement of the displacement member 1470 moves the base 1472 in the direction of the longitudinal axis.

[0161] When moving from the displaced position to the neutral position, the second chamber 1408 contracts to its minimum volume. As a result, the base 1472 of the displacement member 1470 moves in the direction of the longitudinal axis and toward the fluid outlet 1422. In this way, the fluid is guided to the second one-way valve 1464 with reduced friction. As a result, the fluid is more easily guided to the second one-way valve 1464 and is displaced to the collection container in an effective manner.

[0162] Thus, the initial release of fluid through the third valve 1466 ensures that substantially all of the fluid can be expelled from the second chamber 1408. The second movement of the displacement member 1470 encounters reduced resistance, thereby directing substantially all of the fluid from the second chamber 1408.

[0163] Typically, the fluid directed through the third valve 1466 is air. In particular, as described above, the third fluid flow channel 1489 has a size that limits or restricts the flow of liquid therethrough. In this manner, in response to the second movement, air is initially directed through the third valve 1466. The resistance to the second movement decreases, allowing the displacement member 1470 to continue moving toward the neutral position and directing substantially all of the remaining fluid (typically breast milk) through the second one-way valve 1464 and into the fluid collection container.

[0164] exist Figures 14 to 16 In the example shown, the upper member 1410 and the lower member 1430 are formed of a rigid material, such as a plastic, such as polypropylene. Polypropylene (PP) may be particularly advantageous because it is food-contact safe, suitable for sterilization, and inert to cleaning chemicals. In some examples, the upper member and the lower member may be formed of filled PP, such as PP plus CaCO3 to provide greater strength.

[0165] The support member 1450 including the displacement member 1470 and the first and second one-way valves 1462, 1464 is formed of a fluid-impermeable flexible material. The material can be appropriately elastically deformed. For example, a suitable material can include an elastomeric polymer, such as silicone rubber. The material can suitably have a Shore A hardness of 30 Shore A to 70 Shore A, or suitably have a Shore A hardness of 50 Shore A.

[0166] Various modifications to the detailed arrangements described above are possible. For example, the support member may be omitted and the displacement member may be provided as a separate component from the first one-way valve and / or the second one-way valve. In another example, the support member may include the first one-way valve and the second one-way valve, and the displacement member may be a separate component. The displacement member may be mounted to the lower member to form a first chamber, and the second chamber may be formed by releasably coupling the upper member and the lower member.

[0167] Suitably, in use, fluid may be drawn into the second chamber 1408 through the third valve 1466. The first part of the negative pressure cycle creates suction in the second chamber 1408, which in turn provides a pressure differential across the third valve 1466. The pressure from the ambient atmosphere is greater than the pressure within the third fluid well 1488. The third valve 1466 opens to allow fluid (typically air) to be drawn into the second chamber 1408 along the third fluid flow path 1489.

[0168] Additionally or alternatively, one or more of the one-way valves may be separate components mounted to or within the respective fluid inlet or fluid outlet.Although duckbill valves are described, other types of valves may be suitably employed, such as dome valves or slit membrane valves.

[0169] Although in the above examples, the fluid inlet, fluid outlet and vacuum port are positioned in the lower member, one or more of the fluid inlet, fluid outlet and vacuum port may be positioned in other suitable positions. As long as the variable volume second chamber is positioned between the first one-way valve and the second one-way valve, the first one-way valve and the second one-way valve and the corresponding inlet and outlet may be positioned in any suitable position in the valve assembly.

[0170] Similarly, the vacuum port may be positioned anywhere as long as the vacuum port is in fluid communication with the first chamber.

[0171] The displacement member may be any member suitable for changing the volume of the second chamber. For example, the displacement member may include a reciprocating member that is biased to substantially close the second chamber. The reciprocating member may be in the form of a piston that is configured to reciprocate within the second chamber. A spring or other suitable biasing element biases the piston to substantially close the second chamber.

[0172] When negative pressure is applied to the first chamber via the vacuum port or inlet, the piston slides to reduce the volume of the first chamber and increase the volume of the second chamber, thereby reducing the pressure in the second chamber to open the first one-way valve and then draw fluid from the fluid inlet into the second chamber.

[0173] When the negative pressure in the first chamber is released, the first chamber returns to atmospheric pressure, and the biasing element is used to move the piston to increase the volume of the first chamber and decrease the volume of the second chamber. In doing so, the first one-way valve 362 closes to prevent fluid backflow, and the third valve opens to allow fluid to leave the second chamber. Subsequently, the second one-way valve opens to allow fluid to leave the second chamber through the outlet. The second one-way valve 362 can then be used in the same manner as above. Figures 14 to 16 The cycle is repeated in the same manner as described.

[0174] Reciprocating movement of the piston may alternatively be achieved by manual actuation of a piston rod, for example, alleviating the need for a first chamber, a biasing element and a negative pressure source.

[0175] Any suitable pump may be used with the above described breast pump valve assembly, including but not limited to a negative pressure source such as a piezoelectric pump, a diaphragm pump, a reciprocating pump or a peristaltic pump. Alternatively, a manually actuated pump such as a membrane pump or a piston pump may provide the negative pressure.

[0176] Still alternatively, the negative pressure source may be replaced by a manually or electrically actuated device to move the displacement member to vary the volume of the second chamber. The negative pressure source and actuation device may be provided in a unit integral to the breast pump valve assembly, or may be provided remote from the breast pump assembly and operatively connected via a suitable conduit.

[0177] The valve assembly described herein provides a breast pump that advantageously does not release negative pressure between the breast pump and the user's breast between negative pressure cycles or pulses. As a result, the user is able to use the breast pump without having to apply pressure to the breast, thereby reducing fatigue and discomfort. In addition, the risk of breast milk leaking from the breast pump during expression is reduced.

[0178] The valve assembly described herein also provides the advantage of generating negative pressure at the nipple using reduced movement of the displacement member. Thus, when moving from the neutral position to the displacement position, the displacement member only needs to move a short distance, resulting in a valve assembly and breast pump of reduced size and weight.

[0179] The valve assembly described herein advantageously provides suction with increased efficiency because the suction applied by the breast pump is not repeatedly released and regenerated with each suction cycle. Stimulation of expression of breast milk is effectively provided in an uninterrupted, continuous manner.

[0180] With the arrangement of the present invention, the operational performance of the pump assembly is improved. The fluid flow of breast milk within the fluid chamber is improved so that it flows directly to the collection chamber.

[0181] The breast pump described herein provides improved breast milk collection. The breast pump is capable of expelling or displacing most or substantially all of the breast milk drawn into the breast pump valve assembly into a collection container. More specifically, the breast pump is capable of expelling or displacing most or substantially all of the breast milk drawn into the breast pump valve assembly into the collection container during each suction cycle. Any fluid drawn into the valve assembly is actively pushed out of the valve assembly outlet to the fluid collection container.

[0182] Leakage of breast milk from the assembly is also avoided.Providing a two-part housing and support member as described above allows for simplified assembly and disassembly of the valve assembly to allow the user to easily clean the valve assembly.

[0183] The valve assembly described herein can be compatible with a range of different negative pressure sources or actuating devices. In addition, the valve assembly can be used in various breast pump configurations including manual pumps and electric pumps, and form part of a wearable or non-wearable breast pump assembly.

[0184] It will be clear to a person skilled in the art that features described in relation to any of the above embodiments may be applied interchangeably between the different embodiments.The above embodiments are examples illustrating various features of the present invention.

[0185] Throughout the description and claims of this specification, the words "comprise" and "include" and their variations mean "including but not limited to", and they are not intended to (and do not) exclude other parts, additives, components, integral bodies or steps. Throughout the description and claims of this specification, the singular encompasses the plural, unless the context requires otherwise. In particular, where the indefinite article is used, this specification should be understood to contemplate the plural as well as the singular, unless the context requires otherwise.

[0186] Features, integers, characteristics or groups described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith. All features disclosed in this specification (including any accompanying claims, abstract and drawings) and / or all steps of any method or process so disclosed may be combined in any combination, except combinations where at least some of such features and / or steps are mutually exclusive. The invention is not limited to the details of any foregoing embodiments. The invention extends to any novel one feature or any novel combination of features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one step or any novel combination of steps of any method or process so disclosed.

[0187] The reader's attention is directed to all papers and documents which are filed concurrently with or before the present specification in connection with the present application and which are open to public inspection with the present specification, and the contents of all such papers and documents are incorporated herein by reference.

Claims

1. A breast pump valve assembly, comprising: a first chamber for fluidly connecting to a negative pressure source; a second chamber defined between a first one-way valve and a second one-way valve, wherein the first one-way valve is configured to allow fluid to flow into the second chamber and the second one-way valve is configured to allow fluid to flow out of the second chamber; a fluid flow path between the second chamber and ambient atmosphere, the fluid flow path comprising a selectively openable third valve; and a displacement member fluidly separating the first chamber from the second chamber, wherein the displacement member is configured such that application of negative pressure to the first chamber causes a first movement of the displacement member, thereby increasing the volume of the second chamber and drawing fluid into the second chamber through the first one-way valve; wherein the displacement member is further configured such that when the pressure in the first chamber is equal to or greater than the pressure in the second chamber, the pressure in the first chamber causes a second movement of the displacement member, thereby reducing the volume of the second chamber; and Wherein the third valve is configured to selectively open in response to the second movement of the displacement member, such that the second movement of the displacement member directs fluid from the second chamber through the third valve.

2. A breast pump valve assembly according to claim 1, wherein: The displacement member is configured such that the second movement of the displacement member also directs fluid from the second chamber through the second one-way valve.

3. A breast pump valve assembly according to any preceding claim, wherein: The third valve is further configured to be selectively openable in response to the first movement of the displacement member, thereby drawing fluid into the second chamber through the third valve.

4. A breast pump valve assembly according to any preceding claim, wherein: The displacement member is configured to move between a neutral position when the first chamber is at atmospheric pressure and a displacement position when the first chamber is at a negative pressure.

5. A breast pump valve assembly according to claim 4, wherein: In the neutral position, the displacement member substantially closes at least a portion of the second chamber.

6. A breast pump valve assembly according to claim 5, wherein: In the neutral position, the displacement member blocks the fluid flow path.

7. A breast pump valve assembly according to any preceding claim, wherein: The displacement member is integrally formed with one or more of the first one-way valve, the second one-way valve, or the third valve.

8. A breast pump valve assembly according to any preceding claim, wherein: The displacement member includes a flexible diaphragm configured to deform when negative pressure is applied to the first chamber.

9. A breast pump valve assembly according to any preceding claim, wherein: At least one of the first one-way valve and the second one-way valve is a duckbill valve.

10. A breast pump valve assembly according to any preceding claim, wherein: The third valve is a slit valve, and preferably a dome cross-cut slit valve.

11. A breast pump valve assembly according to any preceding claim, further comprising a housing comprising a first housing member defining the second chamber and a second housing member defining the first chamber, and preferably wherein: The displacement member is positioned between the first housing member and the second housing member.

12. A breast pump valve assembly according to any preceding claim, further comprising a fluid inlet, wherein: The first one-way valve is configured to allow fluid to flow from the fluid inlet to the second chamber and preferably the breast pump valve assembly further comprises an inlet port for fluidly coupling the inlet to a breast receiving part of a breast pump.

13. A breast pump valve assembly according to any preceding claim, further comprising a fluid outlet, wherein: The second one-way valve is configured to allow fluid to flow from the second chamber to the outlet and preferably the breast pump valve assembly further comprises an outlet port for fluidly coupling the outlet to a fluid collection container.

14. A breast pump valve assembly according to any preceding claim, further configured such that in response to the second movement of the displacement member, the fluid flow path directs air from the second chamber through the third valve.

15. A breast pump valve assembly according to claim 14, wherein: The fluid flow path is a recessed channel.

16. A breast pump valve assembly, comprising: a second chamber of variable volume, the second chamber defined between a first one-way valve and a second one-way valve, wherein the first one-way valve is configured to allow fluid to flow into the second chamber and the second one-way valve is configured to allow fluid to flow out of the second chamber; a third valve configured to provide a selectively openable fluid flow path between the second chamber and ambient atmosphere; and a displacement member configured to change the volume of the second chamber, wherein the displacement member is configured such that a first movement of the displacement member increases the volume of the second chamber to draw fluid into the second chamber through the first one-way valve; Wherein the third valve is configured to selectively open in response to a second movement of the displacement member to direct fluid from the chamber through the third valve.

17. A breast pump valve assembly according to claim 16, wherein: The displacement member is further configured such that the second movement of the displacement member reduces a volume of the second chamber.

18. A breast pump valve assembly according to claim 16 or claim 17, further comprising a first chamber, wherein: The displacement member fluidly separates the first chamber from the second chamber.

19. A breast pump valve assembly according to claim 18, further comprising a vacuum port for fluidly connecting the first chamber to a source of negative pressure.

20. A breast pump valve assembly according to claim 19, wherein: The displacement member is configured such that application of negative pressure to the first chamber causes the first movement of the displacement member, thereby increasing the volume of the second chamber and drawing fluid into the second chamber through the first one-way valve.

21. A breast pump valve assembly according to any one of claims 16 to 20, wherein: The displacement member is further configured such that when the pressure in the first chamber is equal to or greater than the pressure in the second chamber, the pressure in the first chamber causes the second movement of the displacement member.

22. A breast pump valve assembly according to any one of claims 16 to 21 further comprising an actuator configured to operably move the displacement member to thereby vary the volume of the second chamber.

23. A breast pump comprising: a first chamber and a vacuum port for fluidly connecting the first chamber to a source of negative pressure; a breast receiving member, a fluid collection container, and a fluid flow path extending between the breast receiving member and the fluid collection container; a second chamber defined between a first one-way valve and a second one-way valve in the fluid flow path, wherein the first one-way valve is configured to allow fluid to flow from the breast receiving member into the second chamber and the second one-way valve is configured to allow fluid to flow from the second chamber to the fluid collection container, a fluid flow path between the second chamber and ambient atmosphere, the fluid flow path comprising a selectively openable third valve; and a displacement member fluidly separating the first chamber from the second chamber, wherein the displacement member is configured such that application of negative pressure to the first chamber causes a first movement of the displacement member, thereby increasing the volume of the second chamber and drawing fluid from the breast receiving part into the second chamber through the first one-way valve, wherein the displacement member is configured such that an increase in pressure in the first chamber toward atmospheric pressure causes a second movement of the displacement member, thereby decreasing the volume of the second chamber; and Wherein, the third valve is configured to be selectively opened in response to the second movement of the displacement member to direct fluid from the second chamber through the third one-way valve.

24. A breast pump according to claim 23, wherein: The displacement member is configured such that the second movement of the displacement member also directs fluid from the second chamber through the second one-way valve to the fluid collection container.

25. A breast pump according to claim 23 or claim 24, further comprising a source of negative pressure fluidly connected to the vacuum port.

Images