Note: Descriptions are shown in the official language in which they were submitted.
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SYSTEM FOR A PORTABLE HANDS-FREE BREAST PUMP AND METHOD
OF USING THE SAME
This application is a divisional application of Canadian Patent File No.
2,451,171
filed June 19, 2002.
BACKGROUND OF THE INVENTION
Field of the Invention
(i) The invention generally relates to a portable, hands-free, and visually
friendly
breast pump system and method for collecting milk from a breast of a nursing
mother
which may be hidden from view when in use. In particular, the invention may be
hidden underneath the clothing of a nursing mother, which provides privacy and
avoids any attention and the awkwardness experienced by the nursing mother
using
existing breast pumps.
Description of the Related Art
[2] Breastfeeding is the best source of nutrition for a baby, and it also
offers health
benefits to the nursing mother. Often, the nursing mother needs to use a
breast pump
to collect milk. A variety of breast pumps are available. The basic types of
breast
pumps include manual (hand operated) pumps and electric pumps. The electric
pumps
may be battery and/or AC powered. Further, the electric pumps may be self-
cycling or
require some manual user control. U.S. Pat. No. 6,213,840 combines a manual
hand
pump with a breast pump support bra which supports the weight of the breast.
While
most hand pumps are inexpensive and portable, they are typically
uncomfortable,
inefficient, and difficult to clean.
[3] Some electric pumps are not ba#tery-operated such that the nursing mother
has
to be near a power outlet. Other electric pumps, such as the diaphragm pump
disclosed in U.S. Pat. Nos. 6,257,847 and 6,090,065, are assembled from many
parts
(hoses, gaskets, valves, etc.) which are difficult to clean, wash and carry.
Figure 27
illustrates such a prior art system from the'065 patent having many parts
which makes
it cumbersome and difficult to use. In particular, in such a.traditional
breast pump, the
milk has to pass through a plurality of components, such as a funnel P20, a
cylindrical
guiding means P22, a cap assembly P30, a reservoir P40, an inlet P62 connected
to
the suction assembly, etc., just to get to a container.
[41 The website at ho://www.gpinions-com/kifin-Health-Nurging_ and Feedin&-
Breast Pumps-All/tk PR001.1.5 lists many commercially available breast pumps.
Most of the electric breast pumps, such as Hollister's Purely YoursTM Kit, are
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cumbersome and noisy, and thus very stressful for the nursing mother to use.
In
addition, while the nursing mother is using these breast pumps to collect
milk, she
cannot take care of the baby or do anything else.
[5] Even more, these pumps share the disadvantage that the mother's breast is
exposed during use (lack of privacy) and that their motors are noisy. The
breast pump
vest described in U.S. Pat. No. 5,571,084, although covering most of the
breast, is
heavy and inconvenient to wear.
[6] Currently, there are no portable and user-friendly breast pumps capable of
achieving private, quiet, easy, efficient, and effective breast-feeding.
SUMMARY OF THE INVENTION
[7] It is a purpose of this invention to provide a portable and hands-free
breast
pump system that facilitates hands-free, private, quiet, easy, efficient, and
effective
breast-pumping. [8] It is another purpose of this invention to allow a nursing
mother to collect milk
via a breast pump hidden from view beneath clothing.
[9] It is another purpose of this invention to allow a nursing mother to
collect milk
via a breast pump while nursing a baby or doing something else at the same
time.
[10] It is another purpose of this invention to provide a breast pump that has
very
few parts, and is easy to assemble and clean.
[111 It is another purpose of this invention to provide a breast pump that is
cost-
effective and easy to transport.
[12) It is another purpose of this invention to provide a breast pump with a
vacuum
chamber which also functions as a part of the vacuum mechanism.
(13] It is still another purpose of this invention to reduce the contamination
of the
milk during the processing, such as collection and storage, by a breast pump
system.
[14] It is still another purpose of this invention to accurately emulate the
suckling
action of a baby when breast-feeding so as to facilitate the numerous benefits
of
breast-feeding to the mother and to the baby.
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4a] The invention in one broad aspect provides a breast pump comprising a
housing
carrying a self-contained power source and a pump mechanism, a breast
interface flange
supported by the housing and defining an outlet for expelling breast milk
received from a
breast interfaced with the flange, and the housing and flange being sized and
configured to
be supported between an adult human breast and a brazier, without the aid of
hands or other
body-worn supporting devices other than the brazier, while the breast pump is
actively
pumping milk from the breast and expelling the milk through the outlet.
[14b] Another aspect of the invention pertains to a breast interface flange
for a breast
pump comprising a pliable breast interface body portion configured to form an
air tight seal
between the flange and a human breast, a flange top positioned away from the
breast when
the breast is in operable contact with the flange, and at least one sidewall
extending from the
flange top and faired into the breast interface body portion, the flange top
and sidewall
defining a vacuum chamber in communication with the breast. An outlet is
through the
vacuum chamber, and a one-way valve is coupled to the outlet and operable for
allowing milk
to pass through the outlet when a compression force is applied to the flange
top to create
positive pressure within the vacuum chamber, and further operable for sealing
the flange to
allow resilience of the flange to create negative pressure within the vacuum
chamber when
the compression force is removed from the flange top. The negative pressure
creates a
milking action for causing milk to be expressed by the breast.
[14c] Still further the invention provides a splint configured for removable
attachment
to a breast pump, comprising a coupling end, a milk delivery end, and an
elongate, narrow
conduit between the coupling end and the milk delivery end. The coupling end
is configured
for fluid communication with a breast pump outlet, and the milk delivery end
is configured
for fluid communication with a collection bag. The narrow conduit of the
splint defining a
wave shape across its narrow dimension, and the conduit, when received within
an elongated
neck of the collection bag, is operative to convey milk from the outlet of the
breast pump into
the collection bag while the bag neck and conduit are captured and supported
between a lower
edge of a brazier and the brazier wearer's body.
[14d] Yet further the invention comprehends a collection bag for breast milk,
comprising a bag body defining a side and a top adjacent to the side, an
elongated neck
extending from the bag top, and seams formed into the bag body approximately
extending the
elongated neck into the bag body. The bag body, when substantially filled with
milk, will
not leak milk through the neck when laid on its side.
2A
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BRIEF DESCRmION OF THE DRAWINGS
(i51 The foregoing and additional features and characteristics of the present
invention will become more apparent from the following detailed description
considered with reference to the accompanying drawings in which like reference
numerals designate like elements and wherein;
Figure 1A is a perspective view showing the front side of the breast pump
according to a preferred embodiment of the invention; and Figure 1B is a
perspective
view showing the rear side of the breast pump according to the first
embodiment of
the invention.
Figure 2 is a rear view of a top housing cover of the breast pump according to
the first embodiment of the invention shown in Figure 1.
Figure 3 is side view showing the breast pump according to a second
embodiment of the invention.
Figure 4 shows the details of the slide button according to the second
embodiment of the invention.
Figure 5 is an exploded view showing the breast pump of the first embodiment
of the invention.
Figare 6 is an exploded view showing the breast pump of the second
embodiment in conjunction with a one-way valve and a splint.
Figure 7 is an enldrged inset view of a positive connect pin of the breast
pump
according to the second embodiment of the present invention.
Figure 8A shows an adapter for connecting a positive contacting pin to an
external power supply of the invention, while Figure 8B shows an example of a
tethered drive configuration of the present invention.
Figure 9 is an enlarged inset view showing the connection between the
external power supply of Figure 8A and a positive contacting pin.
Figures 10A and lOB show cross-sectional views of different embodiments of
the flange of the invention.
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Figures 11A-C show a rear-piston lever-arm system of the breast pump
according to the second embodiment that communicates with the servomotor
mechanism so as to move linearly.
Figure 12 shows a second embodiment of a rear-piston lever-arm system in
conjunction with a servomotor mechanism of the breast pump according to the
first
embodiment.
Figure 13 show a third embodiment of the rear-piston lever-arm system in
conjunction with another embodiment of the servomotor mechanism according to
the
invention.
Figure 14 is an exploded view showing the servomotor mechanism illustrated
in Figure 13.
Figure 15 shows a second embodiment of the linear movement mechanism
according to the present invention.
Figure 16 shows a third embodiment of the linear mdvement mechanism
according to the present invention.
Figure 17 shows a one-way valve for use with the breast pump of the
=invention.
Figure 18A shows a splint for use with the breast pump of the invention, while
Figure 18B shows an outer sleeve according to the present invention
Figures 19A and 19B show a collection bag for use with the breast pump of
the invention.
Figures 20A and 20B show cross-sectional views of the pump along with
splint and the bag bent to conform with the contour of the user's breast and
body.
Figures 21A-C depict the actual suckling profiles of a seven-month-old baby
boy.
Figures 22A and 22 B depict the suckling profiles of the present invention.
Figure 23 depict the suckling profiles of a conventional, mass-retail double
putnp set.
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Figures 24A and 24B depict the suckling profiles of a conventional high-end
double pump set.
Figures 25A and 25B depict the suckling profiles of a conventional battery
powered portable pump.
Figure 26 shows a carrying case for a breast pump system according to the
present invention.
Figure 27 is an exploded view showing the breast pump of the prior art (U.S.
Pat. No. 6,090,065).
DE3CRIPTION OF THE PREFERRED EMBODIIVIENTS
[161 With reference to the figures, like reference characters will be used to
indicate
like elements throughout the several embodiments and views thereof. In
particular,
referring to Figures 1A and 1B, the breast pump 10 of the invention is
embodied as a
volume-displacement-type pump. Figure 1A is a perspective view of a preferred
embodiment of the present invention showing the front side of the breast pump
10,
with a dome-shaped housing shell 12. The housing shell 12 gives a natural
appearance of the shape of a breast when the pump 10 is concealed underneath
the
user's clothing. Figure 1B is a perspective view showing the rear side of the
breast
pump 10.
[17) The pumping action generated by the breast pump 10 depends upon a cycle
rate and a vacuum level which are controlled via an adjusting means 14. In one
implementation, a user may use one finger to slide button 16 in an axial
direction
along the groove 18 so as to adjust the vacuum level (or range). Figure 2
depicts the
open top housing cover 12a of breast pump showing the rear side of the slide
button
16 shown in Figure 1.
1181 In a second embodiment shown in Figure 3, the slide button 16 is
configured
to slide in a circumferential direction along the groove 18 so as to adjust
the pumping
action to continuously vary the vacuum level. A push button 20 is used to
control the
cycling rate by incrementally increasing the rate with each push of the button
20 up to
the fastest cycling rate designed into the pump. A fiuther push of the button
20 then
rolls the increment back to the slowest cycling rate for a continuous loop
operation.
Figure 4 depicts that the slide button 16 is connected to an electrical
contacting base
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21 with an arm 16a so as to slide the electrical contacting base 21 and vary
the
vacuum level.
(19) Referring to Figure 5, each breast pump 10 includes a housing shell 12, a
central deck 22 with a servomotor mechaYUsm 24 integrated therewith, and a
straw-hat
shaped breast "flange" 30 having a flange top 35. The servomotor mechanism 24
is a
servomotor mechanism powered by at least one power source 26, such as two AA
batteries. The central deck 22 includes a pump seat 28 for receiving the
servomotor
mechanism 24, two battery seats 32, 32' for receiving the batteries 26, and a
tunnel 34
extending toward the housing shell 12 for guiding and receiving a piston
cylinder 25
of a rear-piston lever-arm system 100 (See Figures 11A - 11C). A central deck
cover
22' is used to fixedly encase the servomotor mechanism 24 and the two
batteries 26 in
the central deck 22.
[20) A second embodiment of the breast pump 10 as shown in Figure 6 is
'designed
for a breast larger than that to which the first embodiment shown in Figure 5
is
applied. Therefore, the central deck 22 of this second embodiment of the
breast pump
has a larger space that allows the two batteries 26 to be positibned parallel
to one
another. In addition, the central deck 22 of the second embodiment
incorporates other
parts for other parts, such as motor cover 40, rather than the fewer integral
pieces as in.
the f rst embodiment.
[21] Specifically, the breast pump 10 of the second embodiment includes the
housing shell 12, the cycling rate button 20, the vacuum level slide button
16, the
central deck 22, the flange 30, the servomotor mechanism 24, and the batteries
26. In
addition, the second embodiment includes a flange support 36 placed between
the
flange top 35 and the.piston cylinder 25, a servomotor cover 40, a battery
cover 38, a
printed circuit assembly("PCA")/microprocessor 90, a PCA compartment 41, a DC
power jack pin 42 (positive), a DC power jack tab 43 (negative), a battery
contact 52,
and a pair of screws 49 (Figure 6).
[22] The first embodiment of the breast pump uses traditional positive and
negative
contact plates with springs for receiving each battery. In the second
embodiment of
the breast pump, one positive contact pin 42 (Figure 7 inset view) is used
instead.
Both of these configurations would be known in the art for purposes of
connecting to
batteries held in small compartments.
[23] The second embodiment of the breast pump (Figure 6) has an additional
flange
support 36 designed to protect against any overshooting of the strokes towatds
the
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flange top 35. The flange support 36 is fixed in place with the control deck
22, such as
via a rotating lock mechanism, and then fitted around the exterior of the
vacuum
chamber 60 so as to have an interference fit at least around the base of the
flange 30
(i.e., the bellows' area of the flange which creates the air displacement).
The flange
support 36 is an individual, part of the unit assembly designed to be attached
onto the
flange 30. The flange support 36 not only holds the flange 30 in place during
the
pumping action (prevents over-pressure on the flange top 35) but also supports
the
vacuum chamber 60 from collapsing.
[24] Unlike most other breast pumps which have their pump mechanisms situated
outside of their breast interface elements or even at a remote distance from
the breast
interface element, the servomotor mechanism 24 of the invention is integrated
inside
the pump 10. The servomotor mechanism 24 is designed to be lightweight (for
example, 0.4 oz. making each entire pump.10 weigh only 2.4 oz. without
batteries or
4.2 oz. with batteries) such that it sits directly inside the pump 10 and is
supported by
the housing without any additional components. The pump 10 in turn is
exclusively
supported by the bra and the negative pressure created between the breast and
the
flange 30 . by the servomotor mechanism 24 and the lever arm system 100. In
variations of the present invention, the servomotor mechanism 24 may be
substituted
with an external driving mechanism, such as an electrical motor or a tethered
manual
pumping device, to provide the negative pressure for pumping. The
i.mplementations
of such substitute devices would have those devices modularized such that they
could
be substituted for one another and be easy to replace.
[251 In a third embodiment of the breast pump, power for the external
servomotor
mechanism 24 is located outside the housing. As shown in Figure 8A, an adapter
46 is
used to connect a positive contacting pin to the externa.l power supply 26 via
a wire
26a. Figure 9 shows an inset view of how the adapter 46 is attached to the
positive
contacting pin 44. This embodiment has the advantage of a longer-lasting power
supply that can be used, for example, in an institutional setting (i.e., a
hospital) or
even a home setting where a more Iimi.ted range of mobility is acceptable or
even
desired.
[261 Alternatively, as shown in Figure 8B, the servomotor mechanism 24 may be
replaced by a servomechanism 24' that may be just a mechanical or pneumatic
linkage 101 connected to the lever arm 21 for implementing the pumping action
of the
vacuum chamber 60. The linkage 101 is connected to a remote control 103 that
acts as
the user's - control for pumping via a linkage element 103. For example, in a
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mechanical implementation, the linkage element 103 is a wire in a sleeve
similar to
that used in bicycle handbrake controls, while the control 103 is a hand- or
foot-pedal
that the user manipulates to move the lever arm 21 in the pump 10.
Alternatively, in a
pneumatic implementation, the linkage element 103 is a flexible pipe that
feeds air or
fluid into the linkage 101. The control 102 is also a hand- or foot-pedal that
controls
the flow of control air/fluid to the linkage 101 to then operate the pumping
motion of
the lever arm 21. The specific details for implementing either of the above-
discussed
alternative embodiments would be within the knowledge of those skilled in the
art.
(27) Various components of the system are formed from resiliently plastic or
other
resin-type materials to accomplish various purposes. For example, in order
that the
splint 110 be flexible so as to conform with the shape of the user's breast,
and so that
the overall structure of the pump 10 is lightweight, including but not limited
to the
housing shell 12, the housing cover 12a, the lever arm 21 and the central deck
22,
these various parts are formed from plastic. Other components in the system
would
be formed from materials appropriate to their function as would be understood
by
those skilled in the art. Other materials for the various components may also
be used
as would be known in the art so long as the selection of such materials is not
inconsistent with the structure, operation and purpose of each such component
and of
the present invention as a whole.
[281 In the general operation and use of the present invention, as shown in
Figures
20B, the pump 10 contacts the breast only with the breast flange 30, and the
dome-
shaped housing shell 12 does not contact the breast. A vacuum chamber 60 is
defined
between the breast flange 30 and the breast, and is completely isolated from
the
woarlcing components of the breast pump 10; the servomotor mechanism 24 is
only in
contact with the exterior surface bf the breast flange 30. This allows the
vacuum
chamber 60 to be maintained at a negative air pressure while keeping the
breast milk
from contacting any other parts of the breast pump 10. The invention
significantly
reduces the number of parts that can come in contact with the milk so as to
make the
system easy to clean and sanitary. Further, the invention eliminates the
potential of
the milk co-mingling with any room air contaminants.
[29] The breast flange 30 is made from silicone or other soft elastic material
for
interfacing directly with a breast and situated on the breast with an inlet
hole 50 (See
Figures 5, 10A and l OB). The inlet hole 50 is designed for seating a nipple
and areola
in a vacuum chamber 60 which is defined between the breast pump 10 and the
breast.
The soft breast flange 30 allows the wearer to pump milk quickly and
painlessly by
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mimicking the baby's suckling movements when the servomotor mechanism 24
moves the flange 30, thereby triggering the female bodys natural reaction to
produce
milk.
[3o] A health benefit for the user or mother derived from the invention is
that, as
the nerves in the nipple and areola are stimulated by the action of the
invention, the
pituitary gland receives a signal to release prolactin and oxytocin into
mother's blood
stream. Prolactin relaxes the mother and stimulates the alveoli to produce
more milk.
Oxytocin causes the alveoli to contract and squeezes milk into the ducts. In
contrast,
the traditional hard fiinnel breast pumps (See Figure 27) simply pull the
nipple into
the rigid shaft to obtain milk. The hard shaft of the funnel is rigid and
unyielding so
that the suction concentrates on the nipple and creates a stinging sensation.
[3il Varying thicknesses in the silicone flange 30 helps the breast pump 10 to
attach to the breast and be compressed towards the nipple by the rear-piston
lever-arm
system 100 shown in Figures 6, 11A 11C and 13. Pumping sessions become faster
by
using the soft flange 30 since the milk is being removed in a more natural way
than
with a traditional hard funnel. As such, the milk is also better extracted
from the
breast to avoid any decrease of milk production due to the remaining breast
milk in
the breast. The milk residuals reduce hormone stimulation for millcing.
[321 As shown in Figure IOA, the flauge 30 includes an outlet 62 through which
the milk drawn from the breast flows out of the flange 30. As will be
discussed
further herein, the millc is then directed away from the breast pump 10 and
stored. In
a variation of the flange 30, as shown in Figure IOB, the outlet 62 is funnel-
shaped so
as to direct the milk flow out of the flange 30 and prevent the milk from
flowing back
towards the breast.
1331 In at least one of the embodiments of the invention, the nipple is well
seated at
the back of the breast pump 10 (inside the chamber 60), where only air is
directly in
contact with the nipple. When the nipple is placed inside the flange 30, the
nipple
rests within the vacuum chamber 60 with the surface of the surrounding area of
the
breast in contact with the surface of the flange 30. Air compression and
suction is then
controllably generated to occur by virtue of the cap-shaped piston cylinder 25
being
cyclically pushed toward the breast so as to physically pusb on the top 35 of
the
flange 30 (see Figure 11A), and then released. The top 35 is formed with a
relatively
thin and soft side wall which has an accordion-style, contour-shape with
altemating
convex and concave edges formed on its surface for transferring and converting
the
contact pressure from the cap-shaped piston cylinder 25 to air compression and
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suction on the nipple. In order to strengthen the top 35 and to help in
uniformly
compressing the vacuum chamber 60, the top 35 may be formed with a circular,
reinforcing plate 35a fixedly imbedded therein. The reinforcing plate 35a is
formed
with a dome-shaped alignment stub or nipple 35b on a top center portion of the
plate
that aligns with the alignment dome 25b of the piston cylinder 25 so as to
center the
vacuum chamber 60 within the piston cylinder 25. This centered aligmnent is
especially important in keeping the vacuum chamber 60 from floating or
misaligning
within the piston cylinder 25 during the pumping operation.
1341 In a first embodiment of the rear-piston lever-arm system 100, as shown
in the
exploded view of Figure 11A, the top of the piston cylinder 25 is shaped like
a yo-yo
or a doughnut without a hole. The lever arm 21 has a protrasion 21a on the top
that
contacts with the alignment dome 25b of the piston cylinder 25. The lever arm
21 is a
projecting handle used to adjust or operate the piston cylinder 25. In
particular, the-
rear piston lever-arm system 100 mechanically communicates with the servomotor
mechanism 24 so as to be activated by the mechanism and thereby pivotally move
the
lever arm 21 which then linearly moves the piston cylinder 25 along a line
generally
para11e1 with the centerline of the pump 10. Such a linear movement is
depicted,
wherein the start or "upstroke" position of the piston cylinder's linear
movement is
shown in Figure 11B.
1351 Figure 11C shows the lever arm 21 pivoted forward thereby linearly
pushing the
piston cylinder toward the flange 30 in a "downstroke" motion. The lever arm
21
pushes the protrusion 21a against the alignment dome 25b of the piston
cylinder 25 to
move the piston cylinder 25 toward the nipple. As mentioned, the nipple is
insulated
by the vacuum chamber 60 of the flange 30 from direct contact with other
components such as the piston cylinder 25. The motion of the piston cylinder
25 is
controlled by the level arm 21 which sets the default position of the piston
cylinder 25
within the timne134 such that the piston cylinder 25 rests away from the
breast when
the pump is not in action. During operation, in the "upstroke" motion, the
lever arm
21 pivots back thereby releasing the piston cylinder 25 and the top 35 of the
flange
30. The movement of the piston cylinder 25 is rather short, delicate and
efficient in
comparison with the pumping action of other breast pumps.
1361 The servomotor mechanism 24 activates the rear-piston lever-arm system
100
embodied in the lever arm 21 and the piston cylinder 25 to create the
"downstroke"
action inward (toward the breast). This downstroke action displaces the air in
the
flange 30 which exits via a one-way valve 140 (See Figure 17) that is inserted
into the
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outlet 62, thereby releasing the vacuum and actively stimulating the breast
for further
expression of milk. In addition, milk expressed by the breast flows out also
through
the one-way valve 140 and into a collection bag 300 (as will be explained
further
herein). The "upstroke" action not only moves the lever arm 21 and the piston
cylinder 25 back into their start positions, but also generates the vacuum
pressure
against the breast. The upstroke and downstroke action of the system 100
altematingly generates and releases the volume displacement vacuum in the
chamber
60, and in particular in the flange 30. Among the features of this
construction, the
"upstroke" passively maintains or creates the vacuum via the vacuum chamber 60
of
the flange 30 elastically returning to its normal state, and not by any energy
expended
by the servomotor mechanism 24. However, in other embodiments, the protrusion
21a may be linked to piston cylinder 25 and the top 35 so as to actively
generate both
the "upstroke" and "downstroke" motions of the vacuum chamber 60.
[37] In order to further simulate the suckling motion of an infant, the
preferred
suckling time to releasing time is , for example, approximately 3:1 in a cycle
of a
second. Namely, the suckling stage takes 3/4 second, and the releasing stage
takes
1/4 second for each cycle. However, other cycling ratios may be used based on
individual user preferences or breastfeeding requirements. The combination of
the
servomotor mechanism 24, the lever arm 21 and the piston cylinder 25 provides
precision control of the air compression inside the chamber 60 which allows
the
precise controlling of the cycle rate and the vacuum level.
[38] In a second embodiment of the rear-piston lever-arm system 100, as shown
in
Figure 12, the lever arm 21 is formed to surround the side wall of the
cylinder piston
25 and connect to the piston via a protrusion 25c formed on the side wall.
When the
lever arm 21 pivots, it rotatively pushes on the protrasion 25c (rather than
push on the
top 35 of the piston cylinder 25) thereby linearly moving the cylinder piston
25.
Otherwise, the operation and effects of this second embodiment are the same as
those
of the first embodiment.
[39] As shown throughout the drawings, the present invention includes various
embodiments for the servomotor mechanism 24. Figures 11A-C depict using a
first
embodiment of servomotor mechanism 24, while Figures 5 and 12 illustrate a
second
embodiment of the servomotor mechanism 24 that is used with the rear piston 25
and
the modified lever arm 21. Figures 6 and 13 shows a third (preferred)
embodiment of
the servomotor mechanism 24 applied to a third variation of the lever arm 21.
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[401 Figure 14 illustrates an exploded view of the third embodiment of the
servomotor mechanism 24 so as to provide an example of the intemal structure
for a
servomotor mechanism that would be applicable to the present invention. That
embodiment is implemented via a structure that includes a potentiometer 201,
an
output gear 202, cluster gears 203-206, a DC motor 207, an arm 208, a motor
housing
209, a screw 210, a rotary pot contact 211, a power contact 212, a gear train
motor
shaft 213, a front cover 214, a rear cover 215, and a pinion gear 216.
Essentially, a
servomotor mechanism for the present invention is implemented via mechanical
or
electromechanical system that pivotally moves a lever arm that then linearly
moves a
piston (in this case, a cylindrical piston 25) that then creates the pumping
motion in
the flange 30. The electric motor structure of the third enmbodiment (even of
the first
and second embodiments) as descn'bed above is one such system. Otherwise,
given
this disclosure of the invention, one of skill in the art should be able to
devise other
structures for a servomotor mechanism that would serve the purposes of the
present
invention and within the scope and intent of the claims.
[41] Figures 15 and 16 illustrate other systems for providing the above-
mentioned
linear movements for the cylindrical piston 25, and thus the pumping operation
of the
flange 30. For example, Figure 15 shows a lead screw mechanism with a rotary
motor. The motor 240 oscillates at a cycle rate set by the user, and the
vacuum level
is controlled either by the user also, or by a microprocessor 90 (See Figure
6)
according to a predetermined stroke/suckling profile. The rotation of a lead
screw 250
pushes a plunger 260 so as to push the top 35 of the flange 30 toward the
breast. The
reverse rotation of the motor 240 rotates the lead screw 250 away from the
breast so
as to move the plunger 260 away from the breast. This allows the flange 30 to
retarn
to its natural state so as to create a negative pressure in the vacuum chamber
60.
[421 In Figure 16, the lead screw 250 is substituted with a rack and pinion
270,
wherein the motor 240 again oscillates at a cycle rate set by the user, and
the vacuum
level is controlled either by the user also, or by a microprocessor 90 (See
Figure 6)
according to a predetermined stroke/suckling profile. The linear movement of
the rack
and pinion 270 pushes the plunger 260 pushing the top 35 of the flange 30
toward the
breast. The reverse rotation of the motor 240 linearly moves the rack and
pinion 270
away from the breast so as to move the plunger 260 away from the breast.
Again, this
allows the flange 30 to return to its natural state and create a negative
pressure in the
vacuum chamber 60.
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[431 The one-way valve 140 shown in Figure 17 is used in conjunction with the
outlet 62 of the flange 30. The valve is generally implemented as a one-piece
element
that is inserted into the outlet 62. A.lternatively, the one-way valve may be
constructed as an integral part of the flange 30. Its main function is to help
maintain
the vacuum in the chamber 60 during operation and to help draw the expressed
milk
away from the chamber 60 in the flange 30 so as to flow to a collection bag
300.
However, other embodiments as those of skill in the art would understand may
be
accomplished used to implement the one-wayvalve 140.
[441 The splint 110 shown in Figure 18A guides the milk from the pump to a
collection bag 300. The splint 110 has a cup 115 and a wave-form portion 117.
The
cup 115 and the wave-form portion 117 of the splint 110 are inserted into the
neck of
the collection bag 300, extending downward to ensure the neck walls do not
collapse
due to the pressure from the bra at the point where the collection bag exits
at the
bottom edge of the bra (as will be discussed further hereinbelow). The cup 115
is
formed to pressure fit into the outlet 70 of the housing shell 12 when
inserted using an
upward sliding force. The cup 115 is intended to have at least a liquid-tight
fit within
the outlet 70 while guiding the milk out of in the chamber 60. Preferably, the
cup 115
has an air-tight fit when positioned in the outlet 70. Such a pressure fit is
intended to
hold the bag 300 tightly to the cup 115 so as to avoid any milk spillage and
any air
contaminants therebetween. At the bottom of the cup 115, there are holes 116
through
which the milk is intended to flow out of the cup 115 and onto the wave-form
portion
117 of the splint 110. In a preferred embodiment, the cup 115 has an extruded
rim
which will contact the outer edge of the neck of a collection bag 300 so as to
further
seal the neck. The splint may be formed integrally with the bag by
incorporating the
extruded tube in the construction of the collection bags. In such a case, a
hot-pressed
tear-off line is set between the end of the splint and the end of the bag
neck.
[45) Also, in another variation as shown in Figure 18B, an outer sleeve 111 is
used
to surround the neck 310 of the bag 300. The outer sleeve serves to protect
the neck
of the bag 300 as it extends from the pump to the body 305 of the bag 300. In
this
implementation, the neck 310 of the bag connects directly to the one-way valve
140
with the sleeve 111 surrounding the connection. In one form, the outer sleeve
111 is
C-shaped in cross-section and also formed of a resiliently plastic material,
which
allows the sleeve to have some flexibility. Other cross-sectional shapes or
configurations as would be understood by one of skill in the art to perform
the same
function as the C-shaped sleeve may be used.
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1461 When viewed along its longitudinal axis, the wave-form portion 117 has a
substantially sinusoidal contour, wherein the peaks and valleys of the
sinusoidal
contour form channels along which the milk flows downward to the collection
bag
300. The use of the wave form portion 117 enjoys several benefits over using a
conventional tube form.. First, it avoids any obstruction caused by air
bubbles stuck in
a tube. Second, a splint having a wave-form portion is more easily bent than a
tube so
as to conform with the contour of the breast and the bra to in order to reach
the
collection bag or a bottle. Third, the wave-form portion is easier to clean
and keep
sanitized than a tube. Plastic tubing needs to be cleaned each use. If washed,
it has to
be hung to allow it to drain and dry thoroughly. In contrast, the wave-form
splint
dries out more easily than a tube form. Lastly, a wave-form structure
confronts less
air resistance than a tabe when it is inserted into either a regular container
or the
collection bag 300. As will be discussed further hereinbelow, the sub-assembly
of the
one-way valve 140 and the splint 110 provides further support for the vacuum
chamber 60 so as to prevent it from collapsing.
[47] As shown in Figures 19A and 19B, the collection bag 300 is made of
plastic
and substantially deflated so as to be maintained in a substantially vacuum
sta.te for
receiving the splint 110 and the milk. In one embodiment, the collection bag
300 is
made by hot-pressing two thin plastic sheets to form a square bag body 305
with
sealed edges 301, 301', 302, 303, 303' and a neck 310 with sealed edges 311
and 311'.
Meanwhile, each perforation line 312 is punched with holes for easily
separating the
bags with a slight force. At the same time, graduations are printed on the
surface of
one plastic sheet to indicate ounces or milliliters. The sequentially hot-
pressed bags
are rolled into one roll to reduce storage space and make them easy to
transport.
Alternatively, the bags may be made using other conventional methods for
fabricating
plastic bags known in the art. Also, the bags may be formed into other shapes
or with
additional features (i.e., resealable tops, adhesive surfaces) or using other
different
materials that have the same manufacturing, sanitary and liquid-proof
characteristics.
[48] The sealed edges 311 and 311' of the neck extend into the bag body 305 so
that the splint 110, including the cup 115, can be fully inserted inside the
neck 310 to
completely seal the splint inside the collection bag 300 thereby avoiding any
milk
spillage outside of the collection bag 300 during use. After the collection
bag 300 is
filled, a user can remove the splint 110 and roll the neck 310 so as to seal
the bag.
Further, adhesive tape or an adhesive surface formed on the neck 310 or the
body 305
may be used to fixedly secure the rolled neck to the body of the bag.
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(491 In another embodiment, an additional pair of sealed edges 306, 306' in a
V-
shape are hot-pressed next to the neck 310 to provide additional pressure on
the neck
after the neck has been pressed from the top-down to expel any residual milk
in the
neck of the bag. In addition, the sealed edges 311, 311' include lower
extensions that
promote the sealing of the neck 310 when the neck is pressed, so as to
fiinction as a
simple, one-way valve to prevent milk spillage after the neck is press-sealed.
The
neck of the collection bag with the sealed edges in a V-shape effectively
becomes
spill-proof after being pressed shut. This structure of the bag 300 solves the
common
problem encountered by mothers that use conventional plastic collection bags
when
they pump for breast milk. The plastic collection bags of the prior art have
not been
able to provide any effective means for sealing closed so as to allow the
mother to put
down the bags without spiliing.
(50] In a further embodiment of the invention, an additional tear notch 304 is
hot-
pressed at a corner of the bag so that a user may tear off the bag at the line
to release
the milk into another container to feed a baby. Additional tear notches are
hot-pressed
at the neck of the bag so that a user may alter the length of the neck by
tearing off the
bag at any one of the notches.
(511 - In a preferred implementation, each bag 300 is a freezer grade bag made
of
FDA rated plastic and intended only for single use so as to keep the milk from
contamination caused by any residuals of old milk and eliminate laborious
cleaning.
The preferred dimensions of the bag body are 4.25 inches by 3 inches, and the
dimension of the neck is 5.0 inches in length. The capacity of each bag is 4-8
ounces,
which is the average production amount for a nursing mother. However, other
dimensions may be used as one of skill in the art would undeistand.
(52] Like breastfeeding, pumping is a leamed skill. Most mothers are able to
express only a few drops of milk when they first try a breast pump. Sometimes
if
mothers don't see milk immediately after beginning pumping, they start to pump
harder or increase the suction with the mistaken idea that more pressure will
"pull" the
milk out. Doing this can cause discomfort and anxiety and actually discoura.ge
the
let-down response. The invention is simple and easy to use so that the mother
will
intuitively become efficient at pumping without much practice and knowledge of
how
the breast works. In addition, many working mothers have no option but to pump
in
their offices or in a restroom. The privacy of using a conventional breast
pump and
the effect of the ambient air on the safety of the breast milk are at issue.
CA 02625100 2008-04-04
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[531 As generally illustrated in Figures 20A and 20B, a user just inserts a
one-way
valve 140 (if made as a separate component) into the hole in the flange 30 as
a cap on
the splint/bag. Otherwise, if the valve 140 is manufactured to be an integral
part of
the flange 30, then the user just then proceeds with inserting the "splint"
110 (the
wave-shape guiding means) into neck 310 of a disposable collection bag 300.
The
splint 110 serves to keep the neck 310 of the bag fluid-passable as it passes
underneath the bottom edge of the bra. The sub-assembly is inserted into the
outlet
70 of the housing 12 at the bottom of the flange 30 and the breast pump 10.
With the
sub-assembly in place, the cup 115 of the splint 110 fixedly connects to the
outlet of
the one-way valve 140.
[54) There is no need for the mother to undress herself in order to use the
breast
pump of the invention. In contrast, all the prior art requires a user to
undress herself
so as to use the pump.
[551 After inserting the splint 110 into the housing shell 12, the user can
insert the
entire pump 10 with the sub-assembly of the splint 110 and collection bag 300
underneath her clothing and against the her breast. The inlet hole 50 is
positioned
over the breast so as to cover and surround the nipple and thereby catch the
expressed
breast milk. Alternatively, the user can insert the pump 10 underneath the
clothing
first, then insert the sub-assembly of the splint 110 and the collection bag
300.
[561 In at least one embodiment, the insertion of the sub-assembly may be
designed
to act as an activation switch for the operation of the pump 10.
Alternatively, either
the slide button 16 or the push button 20 may be used as the activation
switch, or a
combination of the slide button 16 or the push button 20 in conjunction with
the
insertion of the sub-assembly. In an even further embodiment, the servomotor
mechanism 24 may be activated by an initial movement of the switch 16
resulting
from the insertion of the sub-assembly.
[57] When a collection bag is filled or when the user is finished using the
pump 10,
the splint 110 along with the bag 300 is removed from the pump 10, but with
the one-
way valve 140 left in place to keep the outlet 70 plugged thereby prevent any
milk
from dripping out of the outlet 70. Upon removal of the sub-assembly, in one
embodiment, contact between the sub-assembly and a switch of the servomotor
mechanism 24 is severed which turns off the pump 10. As mentioned, the vacuum
chamber 60 is air-tight and isolated from outside air turbulence. Such a
design not
only maintains the privacy of the user but keeps the pump from contacting any
outside
air contaminants.
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[58) With respect to the adjusting means 14 (See FigurelA, 1B and 3), the
pumping rate is controlled via a microprocessor 90 which reads the user inputs
from
the switch slide button 16 and the push button 20 for the vacuum level and the
cycling
rate, respectively, so as to power the servomotor mechanism 24 accordingly.
The
servomotor mechanism 24 in tarn activates the rear-piston lever-arm system 100
to
create a stroke action toward and away from the breast in accordance with the
desired
settings. When the appropriate time has passed, the microprocessor 90 will
reverse
the motor system to allow the flange 30 to return to its natural state. As
noted above,
the stroke action is programmed to mimic the natural suck-hold-release-relax
cycling
of a nursing baby according to the age of the baby. The present invention
applies
mimiclcing the baby's suckling movements to trigger a nursing mother's natural
reaction to produce milk. The pumping rate in the present invention may be
controlled and/or programmed to mimic both the nutritive and non-nutritive
suckling
actions of the a baby, which have distinctly different cycling
characteristics.
[59l According to a controlled study of a seven-month-old baby boy, the suck-
hold-release-relax cycle starts with a series of non-nutritive sucks at low
vacuum
levels with a high suckling rate as the suckling pulses depicted in Figure
21A. The
non-nutritive suckling rate typically is higher than nutritive suckling; in
this example,
the non-nutritive suckling exceeded 100 cycles/min while nutritive suckling
was 30 -
60 cycles/min.. The peak vacuum level of each suck increases until reaching a
threshold for milk expression (the first and second nutritive suclcs) then
holds longer
on the tlireshold (152 mmHg, in this case) than non-nutritive sucks with no
plateau
but mere a peak. The plateaus exhibit distinct flatrtess to hold the threshold
vacuum
level of each cycle. The holding period (in the plateau) is about 2-3 times of
the relax
period (drop from the plateau).
[601 Figure 21B shows a second example illustrating a steady-state post-
ejection
reflex action Essentially, the baby has achieved a rhythm in suckling. Figure
21C
illustrates the threshold vacuum level decreasing with the cycle rate
increasing. In
this example, the baby is finishing feeding and/or tiring. Overall, the study
reveals
that the holding and releasing timing of a baby suckling is not symmetrical.
Depending on the baby, there may be rapid transitions betweeu holding and
releasing
periods. In the present invention, the microprocessor 90 is programmed to
mimic the
natural suck hold-release-relax cycling of a nursing baby along the lines of
the results
of the study.
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161) The microprocessor 90 may be programmed to suggest or control the vacuum
level and the cycle rate. Iu one preferred embodiment, the microprocessor 90
is
programmed with artificial intelligence so as to mimic the natural sucle hold
release-
relax cycling of a nursing baby as discussed. Each stroke of the breast pump
of the
present invention _has a definite holding period, which is about 2 - 3 times
the
relaxation period. As depicted in Figures 22A and 22B, the cycle pro$le is
designed
to be consistent regardless of the maximum vacuum level or the cycle rate
settings.
[62) In particular, the suction level starts at a minimum at the beginning for
a new
nursing mother, and then some quick, short pulses at the start of the pumping
to
especially stimulate and imitate more closely the way a baby initiates
breastfeeding.
Once the milk is flowing freely, long steadier strokes are initiated so as to
be effective
and less tiring. Since each woman has a different comfort level, the level may
then be
gradually increased to what is comfortable for her. The pumping mechanism
supports
a cycle rate up to 80 cycles per minute, which is higher than most of the
other portable
breast pumps (25-60 cycles/minute). However, the preferred cycle rates range
from
35-60 cycles per minute which balances the efficiency and the comfort of the
user.
The most preferred cycle rate (45 cycles/minute) takes less than one-quarter
second to
fully vacuum the chamber 60 and incurs minimum noise.
[63) This stroke action creates a vacuum on the order of 200 mmHg in the
flange
30 while the one-way valve 140 seals off the opening. As shown in Figures 22A
and
22B, when the maximum vacuum level is set at 136 mmHg, the matching cycle rate
is
39 cycles/min. when the maximum vacuum level is set at 204 minHg, the matching
cycle rate is 36 cyeles/min. Vacuum control circuitry is provided for allowing
manual
adjustment of the level of vacuum generated by the electric pump means. This
is
accomplished by controlling the stroke length of the servomotor mechanism. In
another embodiment of the invention, some residual vacuum is programmed in the
stroke profile.
[64) In another variation of the invention, a flow sensor may be connected
with the
adjusting means 14 to monitor the suckling results of the stroke actions.
1651 In contrast, the commercially available products simply operate under
mathematics profiles rather than a natural baby suckling prof le as the
present
invention. For example, the characteristics of one inexpensive, mass-produced
double
pump set allows manual control as well as residual vacuum as shown in Figure
23.
However, it operates with excessive tissue stress due to its slow vacuum rise
profile.
In addition, it operates terribly inefficient at 7 cycles/minute, which takes
8 seconds to
18
CA 02625100 2008-04-04
WO 021102437 PCT/US02/19339
reach the fuIl vacuum level of 220 mmHg. Other conventional high-end double
pump
sets operate according to the profiles such as those shown in Figures 24A and
24B
which are within appropriate vacuum levels (180-200 mmHg) at an appropriate
cycle
rate range of 47-53 cycles/ min. Nevertheless, such systems have no holding
periods,
but instead release their vacuums immediately upon reaching full vacuum. One
popular battery powered portable pump as shown in Figures 25A and 25B operates
= with appropriate holding periods (1-1.4 seconds) and releasing periods (0.9
second),
but dragging along a slowly increasing profile from vacuum levels 100 to 270
mnHg
at inefficient cycle rate range of 27-29 cycles/ min. Such a profile yields
long periods
of stress on the breast to reach a excessively high vacuum level of 270 mmHg.
(66] Studies and experience have shown that young breastfed babies usually
need
to nurse every 2-3 hours, and that it is best to pump on the same schedule.
The more
the breasts are stimulated, the more milk is produced. A good time for many
mothers
to pump is about one hour after the baby's first morning feeding. Most women
tend to
have more milk earlier in the day. The length of time spent pumping varies
with each
woman and with each day. When pumping one side at a time, alternating breasts
several times during expression is more stimulating and can result in a higher
volume
of milk. Pumping at one side of the breast and nursing on the other side has
the
advantage of using the body's natural response to let down the milk for the
baby.
[67] The microprocessor 90 of the present invention may be programmed to
suggest or control the timing for pumping. For example, using two pumps 10
simultaneously can cut the total pumping time in half. Double pumping may also
result in better stimulation of prolactin due to its sense of balance provided
to a
nursing mother. In a double pump arrangement, the adjusting mechanism 14 of
each
pump may be linked by hardwire connection or by wireless link to coordinate or
synchronize their strokes via the miaroprocessor 90.
(68] A commercial implementation of the portable breast pump system of the
invention as shown would include two breast pumps 10, a pair of valves 140 and
splints 110, and a roll of collection bags. All of those components would be
stored in
a soft sided black shoulder bag 400 (Figure 26) having two storage
compartments, the
upper compartment 403 includes a working surface for storage of the pumps on
its
breast pump holders 409, 409', the accessories, and complete instructions; and
the
lower compartment 405 includes heat-insulating side walls and at least one
cooling
element 407. The cooling element 407 is formed with concave seats for
receiving
collection bottles or bags. The closeness of the walls hold the collection
bags next to
19
CA 02625100 2008-04-04
WO 021102437 PCT/US02/19339
the cooling element surfaces. The portable breast pump system of the invention
would
weigh only about 2 lbs., rather than the 8 - 10 lbs. of other commercially
available
portable breast pump system, or even then 25-40 lbs. of those used in
hospitals. The
cooler is available from Rubbermaid (Blue ICE Model No. 1056). The shoulder
bag
400 may be manufactured by companies such as California lnnovation with
synthetic fabric surfaces which are easy to wipe clean. The aggregate weight
of the
cooler and the shoulder bag is approximately 2.51bs.
[691 Parts of the pump such as the collection bags 300 are sterilized to FDA's
hygienic standard for rubber articles before the first use, while other parts
that come
into contact with the mother's skin or the milk will need to be sterilized
before first
use. After initial use, only the flange 30, the valve 140 and the splint 110
need to be
washed in warm, soapy water, rinsed with hot water and drained on a clean
towel.
However, periodic boiling for sterilization may be desirable, depending on the
individual needs of the baby.
[70) In summary, the breast pump of the present invention provides several
unique
features. As noted above, various parts of the system are made of plastic
materials so
as to be lightweight, easy to clean/maintain and easily confonn yvith the
contour of the
user's breast (Figures 20A and 20B). Working moms can thus easily pump their
milk
and save it for the babysitter or daycare. The breast pump of the invention
has very
few parts so as to be easily assembled and cleaned. The overall system of the
present
invention also results in a breast pump smaller than commercially available
breast
pumps such as Hollister's Purely Yours"m Kit, i.e. about 1/4 size of other
portable
(the shoulder bag actually is 70% smaller) and Medela's Pump in Style system.
1711 The principles, preferred embodiments and modes of operation of the
present
invention have been described in the foregoing specification. However, the
invention
which is intended to be protected is not limited to the particular embodiments
disclosed. The embodiments described herein are illustrative rather than
restrictive.
Variations and changes may be made by others, and equivalents employed,
without
departing from the spirit of the present invention. Accordingly, it is
expressly
intended that all such variations, changes and equivalents which fall within
the spirit
and scope of the present invention as defined in the claims, be embraced
thereby.
