Patent Application
20050251089
This invention relates to express kits and cup liners for human milking apparatus, and more particularly, to express kits that do not require a separate pad between a breast cup and a cup liner. The invention also relates to cup liners having a honeycomb or the like as part of the underside of the liner, and cup liners that are fixed in a rigid manner inside the throat of the cup or associated manifold.
Conventional breast pumps generally include a pump and one or more flanges or collection kits. A typical collection kit includes a manifold, a flange for the breast and a vessel for milk collection. The output of the pump is connected to the manifold such that when vacuum is applied by the pump, milk is drawn from a breast in the flange. The milk is collected in the collection vessel.
Other milking devices have a liner in a cup, and apply pulsation or pulsating pressure to a space or chamber formed between the liner and the cup, as in Whittlestone U.S. Pat. No. 4,607,596. The pulsating action around the outside of the breast stimulates milk production, and increases comfort. However, a pad is used between the cup and the liner. In addition to the expense added by the pad, the pad creates cleaning problems. Thus, there is a need for cups for breast milking devices that eliminate the need for a pad between the liner and the breast cup.
The ends of the liner in Whittlestone et al. are wrapped around the ends of the cup, and a bung is inserted in the small end of the cup for connection to the vacuum source. Among other things, wrapping the liner around the small end of the cup in this manner seals the end of the liner for operating purposes. However, assembly is fairly complicated. Moreover, while the vacuum applied to the breast draws milk from the breast, it also tends to collapse the cup liner around the nipple, which can reduce milk production and cause discomfort. Thus, there is also a need for cups for breast milking devices that have cup liners that are rigidly held along the inside of the throat of the cup, for support and sealing purposes.
In keeping with one aspect of this invention, a breast milking device includes a pump that produces both vacuum and pulsating pressure, at least one express kit, and hoses or the like for connecting the pump to the express kit. The express kit includes a manifold, a milk collection vessel, a rigid cup and a flexible liner. It does not have a separate pad between the cup and the liner.
The liner is made of a pliable material, and includes a funnel, a throat, and a transitional portion between the funnel and the throat. The surface of the funnel between the liner and the cup when the liner is installed has a honeycomb structure that creates a forced space between the liner and the cup, while maintaining some degree of flexibility. At the end of the liner inside the throat, a rigid insert or suitable bond maintains some rigidity inside the throat, supports the liner and creates a seal between the liner and the cup at the throat end of the liner.
The above mentioned and other features of this invention and the manner of obtaining them will become more apparent, and the invention itself will be best understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, in which:
a is a perspective view of the cup liner used in the express kit of
b is another perspective view of the liner of
c is a cutaway view of the liner of
As seen in
The pump 16 can be a diaphragm pump, piston pump, or any other suitable type of pump. The pump 16 typically produces an intermittent vacuum or negative pressure. The vacuum output of the pump provides an input to the adapter 17, which in turn produces fairly constant vacuum outputs 18 and pulsating or alternating pressure at outputs 20. The pulsating or alternating pressure is separately provided to massage the breast and relieve congestion brought to the front of the breast by the application of the vacuum. Hoses 22 connect the outputs 18 to the express kits 12, 14, and hoses 24 (shown in broken lines for illustrative purposes) connect the outputs 20 to the express kits 12, 14.
The pump itself could produce both outputs 18, 20 directly, as in Whittlestone U.S. Pat. No. 4,607,596, the contents of which are incorporated by reference in their entirety, or the adapter kit 17 can be used to produce the outputs 18, 20 from a pump that only produces vacuum, as shown in
Shown schematically in
The input 26 also produces the outputs 20, the airflow being as shown by arrows 40 through the chamber 44. The chamber 30 has a one-way check valve 46 that exhausts positive pressure from the chambers 30 and 44.
Pressure at the input 26 is bi-directional, i.e., both positive (pressure) and negative (vacuum), or intermittently negative, and it is transmitted directly to the outputs 20 when two breast cup assemblies are used. A single breast cup configuration would only need one output 20. The valve 28 converts the bi-directional or intermittent pressure at the input 26 into a uni-directional vacuum. A vacuum reserve chamber 48 can be provided, if desired, as can a vacuum control valve 50. The valve 50 can be a needle valve or other suitable device that provides vacuum adjustment.
The express kits 12, 14 (
The milk collection vessel 56 is typically removable. A washer 58 may be provided between the manifold 52 and the milk collection vessel 56, if desired, or the washer 58 may be over-molded in the manifold at manufacture.
A filter 60 may be provided between the vacuum introduced by the hose 22 and a vacuum inlet 62 of the manifold 52, if desired. If the filter 60 is used, a cap 64 can be provided for the manifold 52. The cap 64 can be press fit to the manifold input 62, or connected in any other suitable way. The cap 64 also includes appropriate fittings to pass the pressurized air in the tube 24 to a pressure input 66 in the manifold 52.
Generally speaking, the manifold 52 and breast cup 54 form a funnel 68 and an interior throat 70. The transition from the funnel 68 to the throat 70 can be gradual. The funnel 68 can include an interior raised portion 72, if desired. In addition, an outer lip or rim 74 is provided near the outer edge of the funnel portion 68, with an indentation or groove 76.
A liner 80 is also provided for each express kit 12, 14. The liner 80 has a liner funnel 82 and a liner throat 84, and a transitional portion 86 between the funnel 82 and the throat 84. The liner has generally uniform thickness, to produce a non-peristaltic action when the liner is moved under pressure.
The vacuum applied to the breast in the liner throat 84 (through a vacuum input 85 shown in
The liner releases or moves away from the breast when the pulsating pressure is more negative than the vacuum at the breast. In other words, liner wall movement occurs when the difference or differential between the vacuum at the breast and the vacuum produced by the pulsation source is such that the pulsation source vacuum is greater, (i.e., more negative) than the vacuum at the breast.
The inside or back of the liner 80 is shown in
The liner 80 can have a rigid insert 92 at the outer end of the liner throat 84. The insert 92 can be plastic or any other suitable material, and it can be bonded or molded into the liner when the liner is molded. The insert 92 can be wholly within the liner, or it can extend beyond the open end of the liner.
Among other things,
An alternate embodiment of the cup liner is shown in
Another embodiment of the cup liner is shown in
The cup liner can be manufactured by any suitable process, such as liquid injection molding if silicone is used, or injection molding with the use of TPE, for example.
The liner 80 (
Returning now to
The pulsating pressure is preferably applied at 41-65 cycles per minute, with a pressure differential of about 0.5-2.0 Hg. The relationship of time between the open and closed positions can be expressed as a ratio. The pulsation ratio is preferably between about 20% and 80% open of the total of each pulsation cycle (i.e., time open/total time of each cycle).
While the liners described have a honeycomb structure of some kind, an express kit can be made with a liner that does not have a honeycomb structure, a pad or other structure between the liner and the cup.
The advantages of the invention are now apparent. The honeycomb inside the liner maintains a flexible cushion between the liner and the cup, without the need for additional parts, such as pads or the like. In fact, the pad can be eliminated without having a honeycomb in the liner. In addition, the plastic insert or suitable bond at the throat end of the liner sufficiently seals the end of the liner without wrapping it around another part, and provides rigidity to the liner so that it does not collapse in use, pinching the nipple.
While the principles of the invention have been described above in connection with specific apparatus and applications, it is to be understood that this description is made only by way of example and not as a limitation on the scope of the invention.
