U.S. patent number 3,782,385 [Application Number 05/300,394] was granted by the patent office on 1974-01-01 for breast pump.
Invention is credited to Patrick V. Loyd.
United States Patent |
3,782,385 |
Loyd |
January 1, 1974 |
BREAST PUMP
Abstract
A breast pump utilizing a breast receiving element in the shape
of a truncated cone in which the base of the cone is enlarged in
order to avoid constriction of the nipple disposed therein and
which further employs a suction pump capable of exerting various
levels of vacuum force as required by the user.
Inventors: |
Loyd; Patrick V. (West Laurel,
MD) |
Family
ID: |
23158916 |
Appl.
No.: |
05/300,394 |
Filed: |
October 24, 1972 |
Current U.S.
Class: |
604/74 |
Current CPC
Class: |
A61M
1/06 (20130101); A61M 1/81 (20210501); A61M
2205/073 (20130101) |
Current International
Class: |
A61M
1/06 (20060101); A61M 1/00 (20060101); A61m
001/06 () |
Field of
Search: |
;128/280,281,282,300,301 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Rosenbaum; Charles F.
Attorney, Agent or Firm: Neilan; George J.
Claims
What is claimed is:
1. A breast pump arrangement comprising:
a. a milk receiving receptacle having a neck portion, a removable
cap in fluid-sealing relationship with said neck portion, a breast
receiving element having a tubular portion inserted through a first
opening in said cap, an air withdrawal tube inserted through a
second opening in said cap to permit the evacuation of said
receptacle;
b. a suction pump capable of being regulated to exert different
levels of vacuum force comprising a vented cylinder having a
spring-biased piston disposed therein, said piston having a shaft
extending through an aperture at one end of said cylinder and
pivotally connected to one end of a pump arm, fulcrum means to
enable pivotal movement of said pump arm, a finger-grip portion
extending from said cylinder, and a hollow inlet tube at the
opposite end of said cylinder and provided with a one-way valve
means; and
c. a connecting tube joining said receptacle to said suction
pump.
2. The breast pump as defined in claim 1 further comprising a
vacuum release valve connected to said inlet tube.
3. The breast pump as defined in claim 1 wherein said connecting
tube is flexible.
4. The breast pump as defined in claim 1 wherein the breast
receiving element comprises a truncated cone-shaped upper portion
which contacts the breast, a generally cylindrical intermediate
portion contiguous with the narrow end of said cone, and a
generally tubular lower stem portion contiguous with said
intermediate portion and enlarged at the point of contact between
said intermediate and lower portions.
5. The breast pump as defined in claim 1 wherein the connecting
tube is selectively engageable with the suction pump, and wherein
said cap, said air withdrawal tube and said breast receiving
element form an integral unit which is disposable as a unit.
Description
BACKGROUND OF THE INVENTION
The present invention relates to breast pumps and, more
specifically, to a breast pump arrangement employing an especially
advantageous suction pump which is capable of exerting various
levels of vacuum force on the breast of the user and which is
further provided with a specially shaped breast receiving element
which significantly enhances the comfort of one utilizing the
device as well as the efficiency of the device
Various types of breast pumps have been developed, but, generally
these may be classified into two main groups: those in which the
suction device is in the form of a resilient bulb of the
squeeze-type, or relatively complex devices which employ, for
example, electrically operated vacuum pumps. While the bulb-type of
breast pump has the advantages of simplicity of design and
operation, such bulbs are inherently defective vacuum sources
inasmuch as the suction force exerted by the expansion of the bulb
after compression of same is directly related to the resiliency of
the bulb material and, consequently, it is difficult for the user
to maintain the suction at a comfortable level. In order to create
a suction force with such bulbs, it is necessary to rapidly
collapse the bulb and immediately release same and oftentimes the
sudden suction force which results is extremely painful to the
user. In view of the fact, that the breasts of a lactating female
are extremely tender due to the accumulation of milk, the pain
often associated with the use of bulb-type breast pumps represents
a serious drawback. On the other hand, while some of the
power-driven pumps are capable of being regulated to produce
various levels of vacuum force, they are generally too expensive
and complex for home use.
Therefore, there exists a need for an inexpensive breast pump which
is simple to operate and which may be regulated by the user to
deliver various degrees of suction as required.
SUMMARY OF THE INVENTION
It is therefore a primary object to provide a relatively
inexpensive and efficient breast pump which utilizes an especially
advantageous type of suction pump in combination with a fluid
receptacle and a specially designed breast receiving element, which
suction pump may be regulated by the user to exert different levels
of vacuum force thereby avoiding the problems associated with
certain prior art devices and preventing the discomfort associated
with the use of heretofore known breast pumps.
Another object of this invention is to provide a breast receiving
element which comfortably contacts the breast and nipple without
exerting excessive pressure thereon and which facilitates the
withdrawal of milk therefrom.
Other objects, features and advantages of this invention will
become more apparent to those skilled in the art from the following
detailed description and by reference to the accompanying
drawing.
BRIEF DESCRIPTION OF THE DRAWING
Referring now to the drawing:
FIG. 1 is a side elevational view of a preferred embodiment of a
breast pump arrangement in accordance with the present invention;
and
FIG. 2 is a partial sectional view of a detail of the suction pump
arrangement depicted in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1 of the drawing, there is shown a breast pump
arrangement according to a preferred embodiment of the present
invention, designated generally by reference numeral 10, which is
comprised of a suction pump 12 constructed of any suitable
material, such as lightweight metal or strong plastic, in
combination with a fluid receptacle 14 into which there is inserted
a breast receiving element 16. The suction pump is comprised of a
main body cylinder 18 from which there extends a flat grip portion
20 having four indentations in the edge thereof corresponding to
the fingers of the operator's hand. As can best be seen by
reference to FIG. 2, cylinder 18 is a piston-type pump cylinder
having a cap 22 on one end thereof and having a piston disposed
therein which piston is comprised of a shaft 24 surrounded by
spring 26 and a piston-head 28 attached to the inner end of said
shaft and in contiguous relationship with the inner walls of the
cylinder. Near the other end of cylinder 18, there is provided a
vent chamber 30 with an opening 31 and containing, for example, a
ball-type check valve 32 which permits air to escape from the
interior of cylinder 18 through opening 31.
Shaft 24 extends through an aperture in the center of cap 22 and is
pivotally connected to one end of a pump arm 34 by means of a
conventional pin assembly. Pump arm 34 is connected to grip portion
20 by means of supports 36 and 38 which terminate in journal-box 40
within pump arm 34 and which form a fulcrum for the pump arm. At
the opposite end of cylinder 18 there is inserted a hollow inlet
tube 42 containing a ball-type check valve 44 and further provided
with a spring biased vacuum release valve 46 which communicates
with the interior of inlet tube 42.
Suction pump 12 is connected to fluid receptacle 14 by means of a
disengageable hollow tube or coupling 48 which is removably
attached to an air withdrawal tube 50 inserted through an opening
in cap 52 which frictionally engages neck portion 54 of receptacle
14. Tube 48 is optionally made of flexible material and may be of
practically any length desired. Breast receiving element 16 is
comprised of an upper truncated cone-shaped portion 56, a generally
cylindrical portion 58 and a lower tubular stem portion 60 which is
inserted through an opening in cap 52 and which is enlarged at its
upper end where the stem joins with the intermediate portion.
In operation, the truncated cone-shaped portion of the breast
receiving element is pressed firmly against the breast and the
suction pump is actuated by applying pressure to pump arm 34 near
the distal end thereof which causes the piston to move in the
direction of cap 22. This movement opens valve 44 in inlet tube 42
and closes valve 32 thereby permitting air to be withdrawn from
fluid receptacle 14 through air withdrawal tube 50 into cylinder
18. As the air is withdrawn from receptacle 14 by the suction pump,
a partial vacuum is crested in the receptacle which causes a
suction force to be exerted on the breast whereby milk is withdrawn
therefrom. As the pressure on the pump arm is released, the piston
returns to its static position as a consequence of spring 26 and
valve 44 is closed while valve 32 is opened to allow air within
cylinder 18 to escape.
It is an important feature of the present invention that the level
of suction produced by the suction pump is easily regulated by the
operator. By gently actuating the pump arm, the operator is able to
effectuate a very slight suction force on the breast and by
continually operating the device in such manner slowly accumulate
sufficient suction force to cause the withdrawal of milk therefrom.
It will be appreciated then, that as a consequence of the foregoing
feature, the breast pump arrangement of the instant invention
allows the user to regulate the suction force according to her
personal needs and obviates the problem of sudden or excessive
suction and the resulting serious discomfort associated with
certain prior art devices.
Another significant feature of the present breast pump arrangement
is the spring-biased vacuum release valve 46 which permits the user
to release the partial vacuum created in the fluid receptacle which
causes an immediate cessation of the suction force exerted upon the
breast. Thus, the foregoing vacuum release valve provides a second
means by which the user may regulate the suction force and prevent
any pain which may result, for example, when the pump arm is
inadvertently actuated too rapidly or with excessive force.
Another important feature of the instant invention is the special
design of the breast receiving element wherein the
breast-contacting surface is in the shape of a truncated cone
having an enlarged cylindrical base portion. Inasmuch as the breast
receiving element is enlarged at the point where the nipple will
normally be situated during the operation of the device, the nipple
and the lactiferous ducts contained therein are prevented from
being constricted by the suction force exerted by the device which
would, of course, preclude the flow of milk and defeat the intended
purpose of the device.
In addition to the above features, it is intended that the fluid
receptacle, cap, breast receiving element and air withdrawal tube
be manufactured as a unit and constructed of suitable lightweight
plastic or other material so that the unit may be sold separately
and disposed of after each use thereby avoiding problems of
contamination and the need for sterilization.
While the invention has been described and pointed out with
reference to certain embodiments thereof, those skilled in the art
will appreciate that various changes and modifications and
substitutions can be made without departing from the spirit of the
invention. For example, while ball-type check valves are depicted
in the accompanying drawing and referred to above, it is apparent
that any suitable valve may be used for the inlet check valve and
the valve in the vent chamber. Moreover, in lieu of a valve in vent
chamber 30, the flow of air into the cylinder during the upstroke
of the piston may be restricted and the venting of the cylinder on
the downstroke thereof may be controlled by placing one's finger
over the opening in the vent chamber during the appropriate cycle.
It is intended, therefore, that the invention be limited only by
the scope of the claims which follow.
* * * * *