U.S. patent number 3,559,647 [Application Number 04/734,645] was granted by the patent office on 1971-02-02 for controllable underwater drainage apparatus.
This patent grant is currently assigned to N/A. Invention is credited to Robert E. Bidwell, Edward J. Hallstein, Leonard D. Kurtz, Sidney Mishkin.
United States Patent |
3,559,647 |
Bidwell , et al. |
February 2, 1971 |
CONTROLLABLE UNDERWATER DRAINAGE APPARATUS
Abstract
An underwater drainage apparatus of the type having integrally
formed therein a trap chamber and an underwater seal chamber and
also a pressure regulating manometer chamber. A baffle arrangement
is provided for preventing loss of liquid from the underwater seal
chamber and/or the pressure regulator chamber; and a fluid flow
meter is provided for measuring air flow through the underwater
seal chamber and/or through the pressure regulator chamber. A
special pediatric compartment is formed in the trap chamber.
Inventors: |
Bidwell; Robert E. (Wantagh,
Long Island, NY), Mishkin; Sidney (Roslyn, Long Island,
NY), Kurtz; Leonard D. (Woodmere, NY), Hallstein; Edward
J. (Smithtown, NY) |
Assignee: |
N/A (N/A)
|
Family
ID: |
24952524 |
Appl.
No.: |
04/734,645 |
Filed: |
June 5, 1968 |
Current U.S.
Class: |
604/321; 73/200;
137/176; 141/59 |
Current CPC
Class: |
A61M
1/61 (20210501); Y10T 137/3018 (20150401); A61M
2206/14 (20130101) |
Current International
Class: |
A61M
1/00 (20060101); A61m 001/00 () |
Field of
Search: |
;128/275,276,277,295,BAG(Digest),H-L(Digest) ;137/176 ;141/59
;73/401--402,200,211,216 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Rosenbaum; Charles F.
Claims
We claim:
1. In a drainage device for draining fluids from a cavity
comprising an inlet opening adapted to be placed in fluid
communication with the cavity to be drained, a vacuum opening
adapted to be placed in fluid communication with a vacuum source
and with the inlet opening for drawing fluid from the cavity into
the device, and a manometer for regulating the vacuum, said
manometer comprising first and second columns in fluid
communication with each other, said manometer adapted to receive a
body of liquid within the first and second columns, the first
column being exposed to atmosphere and the second column being
exposed to the vacuum source; the improvement including, a
measuring means formed in said manometer for measuring the rate of
airflow therethrough, whereby when the pressure in the first column
exceeds the pressure in the second column by a sufficient amount so
that air bubbles can flow from said first column, said measuring
means measures the rate of said airflow.
2. A drainage device as claim 1, wherein the said measuring means
includes a gas flow meter, said meter comprising a partition member
located in the interior of the manometer and having a plurality of
holes formed therein, said holes being arranged such that as the
said pressure differential force causing the bubbling increases,
the number of holes through which air bubbles pass also
increases.
3. A drainage device as claimed in claim 2, wherein the said
partition member extends across the bottom of the said second
column generally horizontally, and said holes are located
progressively farther away from the first column, whereby air
bubbles first pass through only the hole closest to the first
column and whereby as the said force increases, air bubbles also
pass through holes farther away from the first column.
4. A drainage device as claimed in claim 3, wherein said second
column comprises two portions in fluid communication with each
other at their upper ends, wherein both portions are exposed to the
vacuum source, and including means for confining air bubbles to
only one of said portions, whereby the liquid in the other portion
remains relatively calm.
5. A drainage device as claimed in claim 3, including a baffle
means for preventing liquid rising with the air bubbles from
passing through the said vacuum opening.
6. A drainage device as claimed din claim 5, wherein said second
column comprises two portions in fluid communication with each
other at their upper ends and wherein both portions are exposed to
the vacuum source, said baffle means comprising an arrangement for
confining the air bubbles to only one of the two portions, and a
baffle member located above the said one portion in the path of the
rising bubbles whereby the liquid which rises with the bubbles
engages the baffle member and falls downwardly as the air continues
to flow towards the vacuum opening.
7. A drainage device as claimed claim 1, including a seal chamber
having first and second columns in fluid communication with each
other at their lower ends, said seal chamber forming a part of the
fluid communication between the vacuum opening and the inlet
opening, the first seal chamber column being in fluid communication
with the cavity being drained and the second seal chamber column
being in fluid communication with said vacuum source, and including
a measuring means formed in the seal chamber for measuring the rate
of gas flow through the seal chamber, whereby when the pressure in
the first seal chamber column exceeds the pressure in the second
seal chamber column by a sufficient amount so that gas bubbles can
flow from said first seal chamber through sad second seal chamber
column, said seal chamber measuring means will measure the rate of
said gas flow.
8. A drainage device as claimed in claim 7, wherein each of said
measuring means comprises a flow meter comprising a partition
member located in the interior of its respective chamber and having
a plurality of holes formed therein, said holes of each flow meter
being arranged such that in each chamber, as the associated
pressure differential force causing the bubbling in the heat
chamber increases, the number of holes through which the bubbles
pass also increases.
9. A drainage device as claimed in claim 8, wherein the partition
member in the manometer extends across the bottom of the second
column generally horizontally, said holes being located
progressively farther away from the first column, and wherein the
partition member in the seal chamber extends horizontally across
the bottom of the second column of the seal chamber and wherein the
holes are located progressively farther away from the first column
of the seal chamber.
10. A drainage device as claimed in claim 9, wherein said second
column of the manometer comprises two portions in fluid
communication with each other at their upper ends, wherein both
portions are exposed to the vacuum source, and including means for
confining air bubbles to only one of said portions, whereby the
liquid in the other portion remains relatively calm.
11. A drainage device as claimed in claim 9, including a baffle
means for preventing liquid rising in the second column of the
manometer with the air bubbles from passing through the said vacuum
opening.
12. A drainage device as claimed in claim 11, wherein said second
column of the manometer comprises two portions in fluid
communication with each other at their upper ends and wherein both
portions are exposed to the vacuum source, said baffle means
comprising an arrangement for confining the air bubbles to only one
of the two portions and a baffle member located above the said one
portion in the path of the rising bubbles, whereby the liquid which
rises with the bubbles engages the baffle member and falls
downwardly as the air continues to flow towards the vacuum
opening.
13. In a device for regulating the pressure within a cavity of a
person, comprising a trap chamber and an underwater seal chamber,
said trap chamber having located at its upper end an inlet opening
and an outlet opening, said seal chamber also having located at its
upper end an inlet opening and an outlet opening, the seal chamber
inlet being in fluid communication with the trap chamber outlet,
said trap chamber openings being separated from each other so that
liquid received from the cavity can fall into the trap chamber
while gas can pass through said trap chamber outlet into the seal
chamber, and the seal chamber having first and second columns in
fluid communication with each other at their lower ends, the seal
chamber inlet being located at the upper end of the first column,
whereby the first column is exposed to pressure conditions in the
trap chamber, and the seal chamber outlet being located at the
upper end of the second column, whereby the second column is
exposed to pressure conditions other than that in the trap chamber;
the improvement including, a measuring means formed in said seal
chamber for measuring the rate of gas flow therethrough, whereby
when liquid is placed in the seal chamber and the pressure in the
first column exceeds the pressure in the second column by a
sufficient amount so that gas bubbles can flow from said first
column through said second column, said measuring means measures
the rate of said gas flow.
14. In a device for regulating the pressure within a cavity of a
person, according to claim 13, said trap chamber including a
pediatric collection compartment and at said trap chamber including
a pediatric collection compartment and at least one other
collection compartment, the two compartments being located side by
side and in fluid communication with each other only through an
upper opening located at their upper ends, said pediatric
collection compartment being located directly beneath the inlet
opening to the trap chamber such that all liquid entering the trap
chamber first enters the pediatric collection compartment, until
the pediatric collection compartment is filled up to the upper
opening, and after which additional liquid entering the trap
chamber spills through the upper opening into the said other
collection compartment, said pediatric collection compartment being
of sufficiently narrow cross section such that the volume of liquid
collected therein may be readily ascertained in increments of
approximately one cubic centimeter.
15. A drainage device as claimed in claim 13, wherein the said
measuring means includes a gas flow meter, said meter comprising a
partition member located in the interior of the seal chamber and
having a plurality of holes formed therein, said holes being
arranged such that as the said pressure differential force causing
the bubbling increases, the number of holes through which bubbles
pass also increases.
16. A drainage device as claimed in claim 15, wherein the said
partition member extends horizontally across the bottom of the seal
chamber at the bottom of the second column, said holes being
located progressively farther away from the said first column,
whereby bubbles first pass through only the hole closest to the
first column, and whereby as the said force increases, air bubbles
also pass through the other holes.
17. A drainage device as claimed in claim 16, wherein said seal
chamber also includes a baffle means for preventing liquid which
rises with air bubbles in the first column of the seal chamber from
being carried over into the trap chamber, whereby when the said
other pressure exceeds the pressure in the trap chamber by a
sufficient amount so that all the liquid in the seal chamber rises
into the first column and air bubbles rise therein, the rising
liquid will engage the baffle means and fall downwardly back into
the seal chamber, as the bubbles continue to travel through the
seal chamber inlet to the trap chamber.
18. A drainage device as claimed in claim 17, wherein the baffle
means comprises a separation chamber located at the upper end of
the first column directly above the first column, and including an
enlarged upper reservoir immediately adjacent and in fluid
communication with the separation chamber, and the said seal
chamber inlet in fluid communication with the trap chamber being
located on the side of the reservoir opposite from the separation
chamber, whereby the gases which pass said baffle means pass
through the enlarged reservoir to the trap chamber.
19. A drainage device as claimed in claim 18, including a pair of
vertically spaced openings between the first column and the
reservoir, the upper of the two openings being positioned so that
gases can pass therethrough to the trap chamber and so that some of
the liquids which engage the baffle means can pass therethrough to
the reservoir, and the lower of the two openings being positioned
so that liquid in the reservoir can pass therethrough and rise with
the bubbles to the separation chamber.
20. A drainage device as claimed in claim 18, including a manometer
having first and second columns in fluid communication with each
other at their lower ends, the first manometer column being exposed
to atmosphere and the second manometer chamber being in fluid
communication with the second column of the seal chamber, the two
second columns thereby forming a common space exposed to said other
pressure conditions and a vacuum opening from said common space
adapted to be connected to a vacuum source.
21. A drainage device as claimed in claim 20, wherein said second
column of the manometer includes 20, manometer baffle means which
prevents liquid, which may rise in the second column when the said
other pressure is less than atmospheric pressure by a sufficient
amount, from passing through said vacuum opening of the common
space to the vacuum source.
22. A drainage device as claimed in claim 21, wherein said second
column of the manometer comprises two portions in fluid
communication with each other at their upper ends and wherein both
portions are exposed to the vacuum source, said manometer baffle
means comprising an arrangement for confining the air bubbles to
only one of the two portions and a manometer baffle member located
above the said one portion in the path of the rising bubbles,
whereby the liquid which rises with the bubbles engages the baffle
member and falls downwardly as the air continues to flow towards
the vacuum opening.
23. In a drainage device for draining fluids from a cavity
comprising, an inlet opening adapted to be placed in fluid
communication with the cavity to be drained, a vacuum opening
adapted to be placed in fluid communication with a vacuum source
and with the inlet opening for draining fluids from the cavity into
the device, and a manometer for regulating the vacuum, said
manometer comprising a first and a second column, said manometer
being adapted to receive a body of liquid therein within the first
and second columns, the first column being exposed to the
atmosphere and the second column being exposed to the vacuum
source; the improvement, wherein said second column includes a
baffle means for catching liquids splashed upwardly with the air
bubbles which pass through the manometer when the vacuum source
pressure is lower than atmospheric pressure by a sufficient amount,
said baffle means being arranged to direct the liquid downwardly
back into the second column while permitting air to pass by said
baffle means, whereby the splashed liquid remains in the second
column while the air is permitted to pass through to the vacuum
opening, said second column comprising two vertically extending
portions separated by a partition and in fluid communication with
each other via upper and lower openings above and below the
partition, respectively, and wherein both portions are exposed to
the vacuum source, said partition arranged such that air bubbles
from the first column are directed substantially up into only one
of the two portions, said baffle means comprising a baffle member
located above the said one portion in the path of the rising
bubbles, such that the liquid which rises in the said one portion
with the bubbles engages the baffle member and falls downwardly as
the air continues to float toward the vacuum source, some of this
liquid falling into the second portion, and wherein an amount of
makeup water flows from the second portion to the first portion
through the lower opening, such that flow of at least some liquid
is created around the partition, up in the first portion, through
the upper opening, and down in the second portion through the lower
opening.
24. A drainage device as claimed in claim 23, said lower opening
being shaped to prevent the passage of air bubbles therethrough
from the first portion to the second portion.
25. A drainage device as claimed in claim 24, wherein the said
lower opening is directed downwardly from said first portion to
said second portion.
26. A drainage device as claimed in claim 23, wherein said
manometer includes a measuring means for measuring the rate of flow
of air through the manometer.
27. A drainage device as claimed in claim 23, including a seal
chamber having first and second columns in fluid communication with
each other at their lower ends, said seal chamber forming a part of
the fluid communication between the vacuum opening and the inlet
opening, the first seal chamber column being in fluid communication
with the cavity being drained and the second seal chamber column
being in fluid communication with said vacuum source, and including
a measuring means formed in the seal chamber for measuring the rate
of gas flow through the seal chamber, whereby when the pressure in
the first seal chamber column exceeds the pressure in the second
seal chamber column by a sufficient amount so that gas bubbles can
flow from said first seal chamber through said second seal chamber
column, said seal chamber measuring means will measure the rate of
said gas flow.
28. A drainage device as claimed in claim 27, including a measuring
means in the manometer for measuring the rate of flow of air
passing therethrough.
29. A drainage device as claimed in claim 28, wherein each of said
measuring means comprises a flow meter comprising a partition
member located in the interior of its respective chamber and having
a plurality of holes formed therein, said holes of each flow meter
being arranged such that in each chamber, as the associated
pressure differential force causing the bubbling in that chamber
increases, the number of holes through which the bubbles pass also
increases.
30. A drainage device as claimed in claim 29, wherein the partition
member in the manometer extends across the bottom of the second
column generally horizontally, said holes being located
progressively farther away from the first column, and wherein the
partition member in the seal chamber extends horizontally across
the bottom of the second column of the seal chamber, and wherein
the holes are located progressively farther away from the first
column of the seal chamber.
31. In a device for regulating the pressure within a cavity of a
person comprising a trap chamber and an underwater seal chamber,
said trap chamber having located at its upper end an inlet opening
and an outlet opening, said seal chamber also having located at its
upper end an inlet opening and an outlet opening, the seal chamber
inlet being in fluid communication with the trap chamber outlet,
said trap chamber openings being spaced from each other so that
liquid entering the inlet opening can fall downwardly in the trap
chamber while gases entering the inlet opening may normally pass
through the said chamber outlet to the seal chamber, said seal
chamber having first and second vertically extending columns in
fluid communication with each other at their lower ends, the seal
chamber inlet being located at the upper end of the first column,
whereby the first column is exposed to pressure conditions in the
trap chamber, and the seal chamber outlet being located at the
upper end of the second column whereby the second column is exposed
to pressure conditions other than that of the trap chamber; the
improvement wherein, said first column includes a baffle means for
catching liquids splashed upwardly with air bubbles which pass
through the first column of the seal chamber during abnormal
conditions when the said other pressure exceeds the trap chamber
pressure by a sufficient amount, said baffle means being arranged
to direct the liquid downwardly back into the first column while
permitting gases to pass by said baffle means and to said trap
chamber, the baffle means comprising an inverted cup-shaped
separation chamber located at the upper end of the first column
directly above the main portion of the first column, and including
an enlarged upper reservoir immediately adjacent and in fluid
communication with the main portion of the first column adjacent
the separation chamber, and the said sealed chamber inlet in fluid
communication with the trap chamber being located on the side of
the reservoir opposite from the main portion of the first column,
whereby the gases which pass said baffle means pass through the
enlarged reservoir to the trap chamber.
32. A drainage device as claimed in claim 31, including a pair of
vertically spaced openings between main portion of the first column
and the reservoir, the upper of the two openings being positioned
so that gases can pass therethrough to the trap chamber and so that
some of the liquids which engage the baffle means can pass
therethrough to the reservoir, and the lower of the two openings
being positioned so that liquid in the reservoir can pass
therethrough and rise with the bubbles to the separation
chamber.
33. A drainage device as claimed in claim 31, including a manometer
having first and second columns in fluid communication with each
other at their lower ends, the first manometer column being exposed
to atmosphere and the second manometer chamber being in fluid
communication with the second column of the seal chamber, the two
second columns thereby forming a common space exposed to said other
pressure conditions and a vacuum opening from said common space
adapted to be connected to a vacuum source.
34. A drainage device as claimed in claim 33, wherein said second
column of the manometer includes a manometer baffle means which
prevents liquid, which may rise in the second column when the said
other pressure is less than atmospheric pressure by a sufficient
amount, from passing through said vacuum opening of the common
space to the vacuum source.
35. In a drainage device for draining fluids from a cavity
comprising an inlet opening adapted to be placed in fluid
communication with the cavity to be drained, a vacuum opening
adapted to be placed in fluid communication with a vacuum source
and with the inlet opening for drawing fluids from the cavity into
the device, and a manometer for regulating the vacuum, said
manometer comprising first and second columns in fluid
communication with each other, said manometer adapted to receive a
body of liquid within the first and second columns, the first
column being exposed to atmosphere and the second column being
exposed to the vacuum source; the improvement wherein, said second
column includes two portions in fluid communication with each
other, said portions being arranged such that when the pressure of
the vacuum source is reduced below atmospheric pressure by a
sufficient amount so that air bubbles can pass from said first
column upwardly through the second column, said bubbles are
substantially confined to only one of said portions, whereby the
other portion remains relatively calm so that the level of the
liquid in the second column can be easily ascertained by observing
the level of the liquid in the said calm other portion.
36. A drainage device as claimed in claim 35, wherein said tow
portions are positioned adjacent each other, separated by a
partition which has formed therein an upper opening for said
communication between the portions near their upper ends and a
lower opening for said fluid communication between said portions
near their lower ends.
37. A drainage device as claimed in claim 36, wherein said lower
opening comprises a passage directed downwardly from said one
portion to the other portion to form a deflector to prevent air
bubbles from passing through said lower openings to the said other
portion.
38. A drainage device as claimed in claim 36, wherein said one
portion includes a downwardly concave part above the said upper
opening for deflecting downwardly the water which is splashed
upwardly by the action of the bubbles passing through the said one
portion thereby preventing the water from passing through said
vacuum opening.
Description
FIELD OF THE INVENTION
This invention relates to drainage apparatus of the type disclosed
in our previous Pat. Nos. 3,363,626 and 3,363,627 for draining
fluid from a cavity, and in particular to improvements in such
apparatus.
BACKGROUND OF THE INVENTION
Our previous Pat. Nos. 3,363,626 and 3,363,627, both issued Jan.
16, 1968, include a brief explanation of the lung structure and of
the human breathing function. They discuss also both the previously
known three-bottle underwater drainage system and also the new and
improved unitary drainage apparatus and system disclosed and
claimed therein. For purposes of brevity, reference may be made to
those previous patents for such basic explanations.
However, in the use of the underwater drainage unit, additional
problems have been uncovered. As mentioned in the said previous
patents, during normal operation of the unit, bubbles pass through
both the pressure regulator chamber and the underwater seal
chamber. One problem has been loss of liquid from the pressure
regulator chamber and/or from the underwater seal chamber due to
this bubbling. It must be remembered that this bubbling can become
very vigorous such that the rising bubbles carry the liquid
upwardly with them in a manner not unlike that of a geyser.
Another problem has been a need for greater control. The previous
structure gives an indication of the difference in pressure across
the pressure regulator chamber and also across the underwater seal
chamber. However, once all the liquid in any U-tube has been pulled
upwardly into one of the two columns, a further increase in the
force creating the pressure differential does not actually change
the difference in pressure across the U-tube. Rather, it only
increases the rate of gas flow (bubbling ) through the column
containing the liquid. Thus, since at various times during the
operation of the underwater seal apparatus both chambers are
bubbling, that is, both are operating at a maximum pressure
differential, it can be seen that knowledge of the pressure
differential does not give a complete and true picture of the
actual conditions existing in the apparatus.
Another problem has been the inability to accurately determine the
level of liquid present in a column of a manometer when bubbles are
passing vigorously therethrough.
Still another problem has been the inability to utilize this type
of underwater seal apparatus for pediatric uses. For normal adult
use the trap chamber must be large enough to collect a sufficient
quantity of fluids, for example, 3000 cubic centimeters. In any
practical construction of a 3000 cubic centimeter trap chamber,
graduations are meaningless below increments of 5 or 10 cubic
centimeters. However, this is insufficient for pediatric uses
therein it must be possible to determine with some degree of
accuracy each single cubic centimeter of accumulated liquid.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide a new an
improved underwater drainage apparatus which overcomes problems
encountered in the use of previous underwater drainage
apparatus.
To fully appreciate the significance of the present invention, it
is necessary to understand additional features concerning the
operation of the underwater drainage apparatus.
The underwater seal chamber serves several purposes, one of which
is to prevent atmospheric air and evacuated gases from passing back
into the pleural cavity. Another purpose is to provide a constant
pressure head against which the drainage force (either suction
applied by a pump and/or positive pressure in the pleural cavity of
the patient during expiration) must act. This second purpose is
fulfilled by keeping relatively constant the quantity of liquid
forming the underwater seal.
In our previous Pat. No. 3,363,327, the phenomenon of "compliance"
was discussed. For example compliance could occur as the patient
expanded his pleural cavity (by movement of his rib cage and his
diaphragm muscles) if the lung failed to expand with the cavity,
owing to an obstruction in the patient's air passage. Compliance
manifests itself in the drainage apparatus by a rapid rise of
liquid in the column of the underwater seal chamber adjacent the
trap chamber. In one of our said previous patents a reservoir is
provided for collecting liquid which rises in this column. However,
if this condition persists, bubbles will flow upwardly through the
column of liquid and create a spray which will carry a substantial
amount of liquid from the underwater seal over to the trap chamber,
notwithstanding the provision of an enlarged reservoir at the top
of the seal chamber.
Thus, according to one feature of the present invention there is
provided an arrangement for preventing liquid sprayed upwardly in
the underwater seal chamber from carrying over into the trap
chamber. In a preferred embodiment of the present invention this
result is obtained by placing a baffle arrangement in the path of
the upwardly moving spray to catch the spray and direct the liquid
downwardly and by placing the opening to the trap chamber away from
the path of the spray. With this arrangement, when the momentum of
the spray is eliminated by engagement with the baffle arrangement,
the liquid falls downwardly back into the seal chamber, while the
gases continue to move through the said opening into the trap
chamber.
When a vacuum pump is attached to the drainage apparatus, the
pressure regulator chamber is often employed to regulate the
pressure to be applied on the side of the underwater seal chamber
closest to the vacuum pump. For example, assume that it is desired
to keep the common space above the leg of the pressure regulator
chamber opposite from atmosphere and the leg of the underwater seal
chamber opposite from atmosphere and the leg of the underwater seal
chamber opposite from the trap chamber at a vacuum of -20
centimeters of water. The pump itself will normally be capable of
pulling a vacuum much greater than the desired -20 centimeters so
that the maximum vacuum which the pump is capable of pulling must
be reduced to the desired level by the pressure regulator. The
pressure regulator chamber is filled with an amount of water such
that when all of the water is located in the leg of the pressure
regulator chamber closest to the pump, it will be at a height of 20
centimeters. Now the pump is turned on until the liquid in the leg
of the pressure regulator chamber closest to the pump, does in fact
rise to a level of 20 centimeters. Further pumping capacity will
not further increase the vacuum in the said common space. Rather,
it will draw air from the atmosphere through the pressure regulator
chamber and into the pump. Meanwhile, assuming that the pressure in
the pleural cavity is greater than -20 centimeters of water, the
liquid in the underwater seal chamber will also rise in the column
opening into the common space. If the pressure in the pleural
cavity exceeds -.degree.centimeters of water by at least the
maximum height of the water in the underwater seal chamber, bubbles
of gas derived from the pleural cavity will pass upwardly through
this column and into the said common space. Thus, it should be kept
in mind that under some operating conditions, bubbles pass upwardly
through both the pressure regulator chamber and the underwater seal
chamber.
The pump will normally be set to evacuate a fixed amount of gas,
for example, one cubic foot per minute If the patient's pleural
cavity has no leaks to admit air therein the quantity of gas
evacuated by the pump will be supplied entirely by the pressure
regulator chamber and considerable bubbling will occur in this
chamber. However, if a leak exists in the pleural cavity so that
air is admitted into the cavity, the underwater seal will bubble
and the bubbling through the pressure regulator chamber will be
correspondingly reduced. It is important for the physician to know
the amount of air leakage into the pleural cavity and also to know
that the pump is capable of maintaining a sufficient degree of
vacuum within the plueral cavity. Obviously, if the pressure
conditions within the pleural cavity approached atmospheric, the
patient would be unable to breathe and the physician must be made
aware of any such approaching condition.
The foregoing problems are met according to the present invention
by providing an airflow meter in the pressure regulator chamber and
the underwater seal chamber. By reading the degree of bubbling
through the underwater seal chamber the physician can determine the
precise amount of leakage through the pressure regulator chamber.
The physician can then be assured that the pump is maintaining the
proper vacuum conditions and that the entire demand of the pump,
i.e. one cubic foot per minute, is not being satisfied through the
pleural cavity.
In a preferred embodiment of the invention, these flow meters each
take the form of a plurality of slots arranged such that as the
airflow is increased, the number of slots through which the airflow
passes is increased.
As discussed above, bubbling of air through a liquid tends to carry
the liquid upwardly in a manner not unlike that of a geyser. This
has presented a problem in drainage apparatus of the present type
in that the water bubbling through the pressure regulator chamber
has tended to continue its upward movement into the pump. This, of
course, is a considerable disadvantage since the liquid could cause
erosion of the pump. Further the reduction in water level in the
pressure regulator results in a corresponding reduction in the
vacuum.
Thus, another feature of the present invention is a baffle
arrangement for preventing the water which rises in the pressure
regulator chamber from being carried into the pump. In a preferred
embodiment of the invention this arrangement takes the form of a
baffle means located in the path of the stream of bubbles so that
the rising water engages the baffle means where it loses its
momentum, after which it falls back into the pressure regulator
chamber while the gas continues its movement into the pump.
The bubbling in the column of the pressure regulator chamber
closest to the pump also presented in the disadvantage that it was
virtually impossible to determine with accuracy the level of the
liquid in that column.
Thus, according to another feature of the present invention the
column of the pressure regulator chamber closest to the pump
comprises two portions in fluid communication with each other
wherein the flow of bubbles is limited to only one of the two
portions so that the other remains calm. The level of the liquid in
the column of the pressure regulator closest to the pump can then
be accurately determined by observing the calm chamber.
According to another feature of the present invention the trap
chamber of the apparatus is provided with a special pediatric
compartment having an opening beneath the main inlet to the trap
chamber so that liquid entering the trap chamber will first collect
in the pediatric compartment. This compartment will be sufficiently
small in cross section so that fluid accumulation therein could be
measured in increments of one cubic centimeter. This special
compartment could be arranged so that after it became full,
additional liquid entering the trap chamber would flow to the
remaining portion of the trap chamber.
Thus, it is an object of this invention to provide a new an
improved underwater drainage apparatus.
It is a further object of this invention to provide a drainage
apparatus, the operation of which can be controlled with greater
accuracy than has been possible heretofore
It is another object of this invention to provide, in an underwater
drainage apparatus, a means for measuring the flow of air through
the apparatus.
It is still another object of this invention to provide, in
underwater drainage apparatus a means for preventing spill-over
liquid from one chamber to an adjacent chamber.
It is still another object of this invention to provide a means for
easily determining the level of liquid in a chamber through which
air is bubbling.
It is still another object of this invention to provide a means for
adapting an adult drainage apparatus for use in pediatric
applications.
Other objects and the attendant advantages of the present invention
will become apparent from the detailed description to follow
together with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
There follows a detailed description together with accompanying
drawings of a preferred embodiment of the invention. However it is
to be understood that the invention is capable of numerous
modifications and variations apparent to those skilled in the art
within the spirit and scope of the invention
In the drawings:
FIG. 1 is a sectional view taken through the center plane of an
underwater drainage apparatus constructed according to the present
invention.
FIG. 2 is a horizontal sectional view taken along line 2-2 of FIG.
1.
FIG. 3 is a horizontal sectional view taken along line 3-3 of FIG.
1.
FIG. 4 is a horizontal sectional view taken along line 4-of FIG.
1.
FIG. 5 is a horizontal sectional view taken along line 5-5 of FIG.
1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings, there is shown an improved drainage
apparatus 10 constructed in accordance with the present invention.
Although the method for making the apparatus does not form a part
of the present invention, it will be noted that the apparatus could
be moulded in two separate halves, which halves would be joined
along the center plane on which FIG. 1 is taken. In this case FIG.
1 would represent one-half of the apparatus wherein the sectional
lines represented the surface to be joined to the mating half, and
wherein the plain areas represent spaces in the finished
apparatus.
The apparatus could be constructed with its tow large sides as
plane surfaces wherein the parts shown in cross section in the
drawings would be ribs extending inwardly from the plane sides.
However, in a preferred embodiment of the invention, as is evident
from FIGS. 2 through 4, the parts shown in cross section in FIG. 1
are formed as indentations from the outermost sides of the
apparatus, which indentations join to form a thin seam between the
various chambers along the center plane of the apparatus. However,
whether seams or ribs are used, for purposes of convenience, the
areas between the various chambers will be referred to hereinafter
as "partition."
Referring now to FIG. 1 there is shown an improved underwater
drainage apparatus 10 having a trap chamber 11, an underwater seal
chamber 12 comprising a first column 12a and a second column 12b,
and a pressure regulator chamber 13 having a first column 13a and a
second column formed in two portions, namely 13b and 13c. The
apparatus is completely enclosed except for an opening 14 adapted
to be connected to the pleural cavity of the patient, an opening 15
adapted to be connected to a vacuum source and an opening 16 to
atmosphere.
One feature of the present invention includes a pediatric
collection compartment formed by partition 20 in the main trap
chamber 11. An upper portion 20a of the partition 20 and a drip
ledge 22 deflect the incoming liquid into the pediatric collection
compartment 21. The main feature of the compartment 21 is that it
is of a small enough cross section so that the amount of liquid
collecting therein can be readily determined in increments of one
cubic centimeter. In a preferred embodiment of the invention this
compartment will hold 250 cubic centimeters of liquid after which
additional liquid will simply flow over the upper portion 20a and
into the main portion of the trap chamber 11 which would normally
be designed to hold approximately 3000 cubic centimeters.
Trap chamber 11 is also provided with a solid cross-rib 24 designed
to strengthen the trap chamber to prevent implosion. This rib 24
separates the bottom of the trap chamber into two parts 23a and
23b. 23a would fill up first after which further liquid would flow
over 24 to 23b.
The underwater seal chamber 12 is formed by partitions 30, 31 and
32 which form first and second columns 12a and 12b communicating
through passage 33 at their lower ends.
At the upper end of column 12a there is provided an enlarged
reservoir 35 with a recessed bottom 36. These elements serve the
same purpose as the enlarged reservoir and recess shown in our
previous Pat. No. 3,363,627.
In addition, there is provided at the upper end of column 12a a
means for preventing liquid surging upwardly in column 12a (e.g.
during compliance) from entering the trap chamber 11. For this
purpose there is provided a separation chamber 39 which lies in the
path of, and thus is engaged by the upwardly surging column of
liquid. As the liquid engages the walls of this chamber it loses
its momentum and falls downwardly while the upwardly surging gases
continue to travel through an upper opening 40 and through the area
35 to the opening 34 leading to the trap chamber 11. To assist this
upward movement of surging gas and liquid, the area 35 is spaced
from the main portion of column 12a by a partition 37. Moreover,
the upper and lower openings 40 and 38 are inclined downwardly
towards the area 35. Thus, while most of the liquid entering
chamber 39 will fall down column 12a, some liquid will enter the
upper opening 40 and fall into the area 35. However, since the
momentum of the liquid at this point has been substantially
reduced, it will fall downwardly under the force of gravity to
recess 36 rather than pass with the gases through the opening
34.
An important feature of the present invention is the gas flow meter
45 for determining the flow rate of gas passing through the
underwater seal chamber. Obviously, for gas to flow upwardly in
column 12b, the level of liquid in 12a must be at the bottom
thereof. The flow meter comprises a series of openings 46a, 46b,
46c, 46d, formed in the web partition member 47. Of course more
openings could be employed if desired. Gas bubbling through opening
46a would indicate a predetermined rate of gas flow. As the gas
flow increased, bubbling would be visible through the two openings
46a and 46b. A further increase in the bubbling rate would be
indicated by bubbles passing through openings 46a, 46b and 46c. In
a like manner additional gas flow would cause bubbling through all
four openings 46a through 46d. This type of flow meter would be of
significant importance for diagnosing certain types of conditions
such as air loss from the patient's lung into his pleural cavity
through a bronchopleural fistula. For example, opening 46a may
represent a loss of 2 liters per minute while flow through openings
46b and 46c may represent an airflow of 4 liters per minute and 8
liters per minute respectively. Air flow through opening 46d would
indicated a flow greater than 8 liters per minute. 2 liters per
minute is believed to be satisfactory. A loss of 4 liters per
minute should be called to the doctor's attention and a loss of 8
liters per minute might well represent an emergency situation.
The column 12b includes an enlarged reservoir area 12c to hold the
water in the underwater seal in the event of violent bubbling of
air through column 12b, as might occur in the case of a very large
bronchopleural fistual.
The portion of the apparatus to the left of partition 32 (as shown
in FIG. 1) represents the pressure regulator chamber 13 having a
first column 13a with its upper end exposed to atmosphere and a
second column which comprises two portions 13b and 13c, each of
which is exposed at its upper end to the pressure at vacuum opening
15. Thus, the upper ends of portions 13b and 13c , together with
the upper portion of column 12b form a common space exposed to the
pressure at vacuum opening 15.
The purpose of the two portions 13b and 13c is two-fold. The main
purpose is to confine the bubbles rising through the pressure
regulator chamber to the portion 13b so that the liquid rising with
the air bubbles will engage a main baffle 53 which will deflect the
liquid downwardly into either portion 13b or 13c after which the
gas would continue its upward movement to the opening 15.
The purpose of the two portions 13b and 13c is two-fold. The main
purpose is to confine the bubbles rising through the pressure
regulator chamber to the portion 13b so that the liquid rising with
the air bubbles will engage a main baffle 53 which will deflect the
liquid downwardly into either portion 13b or 13c after which the
gas would continue its upward movement to the opening 15.
To assist in confining the bubbles to portion 13b, the lower
opening 52 connecting the two portions 13b and 13c is directed
downwardly between lower edge 50a of a partition 50 and a lower
ledge 51. Thus, while portions 13b and 13c will tend to seek the
same level, the bubbles will be confined to portion 13b.
In practice, water will flow clockwise around the partition 50 (as
viewed in FIG. 1) forming a "racetrack" like path of water. Much of
the liquid engaging baffle 53 will fall into portion 13c. However,
since the level of liquid in 13c cannot rise above the level of
liquid in 13b then the level in 13c must go down and the additional
liquid flows through opening 52 back into the portion 13b.
Another feature of the two portion arrangement is that it provides
a calm portion 13c exposed to the same pressure as 13b but
relatively clam as compared to portion 13b. Consequently, the level
of liquid in the second column of the pressure regulator chamber 13
can be readily determined by noting the level of liquid in portion
13c.
In the event that some liquid does flow upwardly pass baffle 53, it
will be engaged by a second baffle 54. Further upward flow of water
is caught by a series of drip ledges 55a, 55b and 55c.
An important feature of the present invention is the flow meter 60
which clearly and visually shows the rate of airflow upwardly
through the second column of the pressure regulator chamber.
REferring to FIGS. 1 and 4, this flow meter 60 comprises a web
partition member 61 extending across the flow meter and having
formed therein a plurality of airflow holes 62a, 62b, 62c and 62d.
Of course the number, shape and/or size of the hold would depend
upon the desired operating characteristics of the flow meter. A
given force would be necessary to draw air through the hole 62a. A
greater force would increase the volume of airflow so that bubbles
passed through hole 62b as well as 62a. With still greater force
the volume of airflow would increase until it flowed through
openings 62cas well as opening 62a and 62b. Finally, still a
greater force would cause further increase in the volume of airflow
so that the air passed through all four openings including opening
62d. By way of example, assuming that the capacity of the pump
attached to opening 15 is one cubic foot per minute, the openings
could be designed to represent one-fourth, one-half, three-
quarters and one cubic foot of airflow per minute. With this
arrangement it would be possible merely by observing the airflow
meter, to determine which portion of the total air passing the
vacuum pump through opening 15 is derived from the pressure
regulator chamber 13 and which portion is derived from the pleural
cavity through the underwater seal chamber 12.
The upper end of column 13a includes a funnel shaped opening 66 to
facilitate placing water into the pressure regulator chamber. There
is also formed a relief opening 65 to assure continued
communication between column 13a and the atmosphere in the event
that the opening 16 becomes obstructed.
The basic operation of the apparatus 10 is similar to the basic
operation of the apparatus as described in our previous Pat. Nos.
3,363,626 and 3,363,627. The features of the present invention have
not changed the basic operation of the apparatus. Rather, they have
been designed for the purpose of increasing the efficiency,
controllability and applicability of this type of apparatus. The
effect that each of these individual features has on the basic
operation is believed to be clear from the above description of the
various features. However, for purposes of convenience, the
operation of the invention will be briefly summarized at this
point.
When the apparatus is to be used as a "three-bottle" apparatus, an
amount of liquid is introduced into the pressure regulator chamber
13 through opening 16 which will give the desired vacuum after the
pump is turned on; and a desired amount of liquid is introduced
into the underwater seal chamber 12 through opening 15. Opening 14
is then connected to the pleural cavity of the patient and opening
15 is connected to a vacuum pump. The pump is then turned on
gradually as the liquid rises in the second column of the pressure
regulator chamber (portions 13b and 13c). As the capacity of the
vacuum pump increases, the liquid rises in portions 13b and 13c
until all of the liquid is contained in these portions. A further
increase in the capacity of the pump will cause air bubbles to be
drawn through opening 62a into the portion 13b and hence through
the opening 15 to the vacuum pump. Any liquid rising with the
bubbles will engage baffle 53 and fall downwardly. Meanwhile the
liquid in the underwater seal chamber may rise in column 12b in
which case bubbles will flow upwardly through opening 46a to the
opening 15 and hence to the vacuum pump.
The fluids (gases and liquids) coming from the patient enter the
apparatus 10 at opening 14. Liquids fall into the compartment 21 as
gases pass through the opening 34 and hence to the underwater seal
chamber. Once the chamber 21 has been filled, additional liquid
entering the opening 14 flows over the upper portion 20a of the
partition 20 into the first main portion 23a of trap chamber 11.
When this fills, further liquid will flow over 24 into 23b.
If "compliance" occurs within the pleural cavity of the patient,
the absolute pressure in the trap chamber 11 could be reduced far
below the absolute pressure in the vicinity of opening 15.
Consequently, the liquid in seal chamber 12 will rise rapidly in
column 12a. As described in our previous Pat. No. 3,363,627 , the
compliance chamber 35 prevents much of this liquid from passing to
the opening 34. However, in accordance with the present invention
the spray of liquid carried upwardly by bubbles will engage
separation chamber 39 where it will lose its momentum and fall
downwardly back to the column 12a or to the area 35.
When the patient is breathing normally, the liquid levels in the
two legs of the underwater seal chamber will fluctuate in response
to pressure fluctuations in the pleural cavity associated with
normal breathing-- assuming of course, that there is a sufficient
amount of water in the underwater seal chamber so that bubbling
does not commence when the pressure in the pleural cavity reaches
its maximum value. With this in mind, it can be seen that these
fluctuations serve as a diagnostic tool to indicate the presence of
conditions such as emphysema and asthma which require that the
patient work harder (create a greater negative pressure in the
pleural cavity) in order to cause expansion of the lung. These
conditions will be indicated by a larger than normal rise of the
liquid in the leg of the underwater seal chamber in communication
with the trap chamber during inspiration.
Although the invention has been described in considerable detail
with respect to a preferred embodiment thereof it should be
apparent that the invention is capable of numerous modifications
and variations apparent to those skilled in the art without
departing from the spirit or scope of the invention as defined in
the claims.
* * * * *