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Патент USA US2134291

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Oct. 25, 1938.
2,134,291
H. H. SCHULZ
SYRINGE
Filed Feb; 6, 1955
‘Fig. 1.
3 Sheets-Sheet l '
Pg. 2. 47a
210
2241
7a 15 3a 3
10b
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36 .33 40“
Mf?rak .
W
3r
Fr 77%
_ '
Oct. 25, 1938.
2,134,291
‘H. H. SCHULZ
SYRINGE
Filed Feb. 6, 1956
Fig.3.
s Sheets-Sheet 2
Fig. 6-;
Arman/5y
Oct. 25, 1938.
H. H. SCHULZ
2,134,291
' SYRINGE
Fiied Feb. s, 1936
{Sheds-sheaf s
My? 24%“.
Patented Oct. 25, 1938
_
UNITED STATES
2,134,291
PATENT OFFICE‘
2,134,291
‘
V
'
SYRINGE
Hans Herbert Schulz, London, England
Application February 6, 1936, Serial No. 62,575
In Great Britain April 27, 1935 I
15 Claims.
This invention relates to syringes especially
suitable for use for surgical and medical pur
poses of the kind in which the ?lling tube also
acts as the discharge tube, and is an improve
5 ment on the invention forming the subject mat
ter of my copending application Serial No. 54,811,
?led December 17, 1935, for Letters Patent ac
'
(01. 128—237l
Fig. 5 is a part. sectional View ofa further _
modi?cation.
Fig. 6 is a part sectional view of a still further
modi?cation, and
'
Fig. 7 is a sectional view showing an attach
ment for ?lling from a tap.
In Fig. 1 an india rubber bag I is adapted to
cording to which during the ?lling operation
be slidden or drawn over to hood an open ended
liquid is forced into an expansible and contract
1.0 ible storage chamber in the form of a rubber
sleeve normally lying in close proximity with the
outer wall of the apparatus, whence it'is dis
charged at a regulatable rate through a valve.
Amongst the desiderata for apparatus of this
pump barrel 2 having an internal screw-thread
2a at that end adjacent to the end wall 3 of the
bag I. Apertures 4 in the wall of the barrel com
municate with apertures 5 in the tapering wall of
class are the following. They should be light
‘and portable, simple in action and easy to ma
nipulate with a single hand, the discharge should
take place at a constant rate, and without the
need of manual force, and the assemblage, dis
'20 assemblage and cleaning operations should be
simple. Further they should be simple and cheap
to construct, the separate parts» should be few,
and the apparatus should so far as possible be
capable of manufacture from hygienic and easily
.25 sterilizable.’ materials. The avoidance of any
tendency to leakage is also of considerable im
portance.
_
The present invention is intended to ful?l
these requirements and according to it the con
30 tractible storage chamber is made in. the form
of a bag or sac which completely enclosesone
end of the apparatus and normally lies in close
proximity with the cylindrical walls or a portion
thereof, and the end of the bag is secured to
makes a ?uid tight joint with the wall of a taper
ing'central aperture in .an internal ?ange 9 of is
the barrel 2. The cylindrical flange 10. of the, '
ringv ‘I ?ts snugly in a ?anged external ‘screw
threaded ring Ill on to which the corresponding
end of the barre-l 2 is» screwed.
'
.
The edges of the ?ange Illa. of the ring I0 may 4.20
be knurled to interlock with the elastic wall of "
the bag I. The external portionqla of the bag I
may be knurled for facilitating hand gripping in
assemblage and disassemblage. I The bag I may
be secured to the ring H1 in any convenient way,
as by moulding the rubber through anchoring
slots “lb of the ?anged portion 10a thereof. An
inner ?ange lb formed on the bag I may be
sprung over the ?anged portion Illa. of the ring I 0
so asto lie between it and the end- of the barrel 2
whereby the bag I, is securely retained in posi- '
tion.
'
‘
.
.
w
7
The seating ring ‘I which has a push ?t with
The
the ring In, is'fast with a hollow stem II which
extends axially alongvthe barrel 2. The outer
valve is situated at the end of the apparatus
preferably remote from the nozzle and enclosed
by the said bag or sac, and is operable by pres
valve l3.whose spindle 14 passes through the
$5 M' .the cylinder wall in a ?uid tight manner.
sure through the same, and the Valve may be
retained in its seat by the elastic reaction there
of. In the preferred form the valve is made in
tegral with the bag or sac.
According to another feature of the invention
the apparatus may be ?lled by resting the nozzle
on the bottom of a basin or the like'and then
pulsating. Other features will become apparent
from the description hereunder.
‘
Examples of the invention will now be more
end of this stem ll forms a seating 12 for a
stem II and is secured by moulding by an an
choring plate l5 to the end wall 3 of the bag.
The thickened portion 3a of the end wall is 40
pressed by the ?nger or thumb to move the '
valve l3 axially off its seating.
Thus the interior of the barrel 2 is divided
into charging and discharging chambers 16 and
ll of which‘ the latter ‘communicates through
. 5
apertures 4 and 5 with the space formed between '
the outside 'of the barrel :2 and the inside of
the bag I when the-latter; is expanded and the
particularly described by reference to the accom
former receives a'piston 19.
panying drawings.
50
mote from thebag end 3 has a threaded collar ‘ '
.
Fig. 1 is a longitudinal'section of one form.
Fig. 2 is a similar View of anotherv form.
,_
‘ “Fig. 3 ma sectional vd'etgtil'sof‘a,n'igdiiicatiggns.
3&1
a plug seating ring 1, the conical centre of which
seqiignalésiatéiligiiélagdiaceiicai
i
v
I
The end of the outer wall’ of the barrel 2 re
2b and, spaced therefrom is anotherll'collar 20
so as to formqan annular channel in‘which a
emergence-mitrans '' ia§lllilng5v£l1h¢
QI-ZEa‘déQcHQEQrQE3Q~Ji§>lz§§§§é§§
will’
‘
2
2,134,291
medially apertured, conical nut 29 which, when
screwed home, compresses the beaded edge Ic
of the bag I against a radial abutment wall of
the other collar 20 and produces an e?ective
?uid tight closure of the bag I around the barrel
2 and at the only joint which the bag I requires.
The collar 20 may be chamfered back away
from its abutment wall and the bag I similarly
shaped by expanding it near-its open end.
The piston 19 has a suction ?ap valve 2I and
10
an outer tubular extension 22. The hollow stem
II passes through the piston I 9 and intrudes
into the tube 24 when this is the nozzle tube, or
into one part of the telescopic tubes 23 and» 24.
15 The tube 23 may be a catheter part which can
be drawn out of the other part and retained in
an inclined position with respect thereto and to
the axis of the instrument by an inclined screw
threaded connection 24b, 24a. An overhang may
20 be provided between the two tubes to prevent
disconnection.
-
.
A non-return valve 25, controls inlet ports 26
into the elastic storage chamber formed between
I and 2, so that on relative movement occurring
25 between the barrel 2 and the piston I9, so that
on pulsating or reciprocating the cylinder whilst
the nozzle 23a is pressed against the bottom of
a vessel of liquid, a charge of liquid is pumped
into the elastic storage chamber.
The piston I9 is returned by an elastic sleeve
30
21 anchored at one end to the piston head, and
at the other end by a beaded edge 21a engag
ing over a shoulder 33 of the barrel, and clamped
by an internal radial wall 20a of the conical nut
35 20 against the corresponding end of the barrel.
To assemble the appliance the sac l is secured
to the ring III. ‘The plug ‘I, ‘Ia is then ?tted in
position as shown with the stem II surrounding
the spindle I4 and the valve I3 is screwed onto
the spindle.
The barrel 2 is screwed on to the ring I0 and
the bag when in its normal position has its free
edge sprung over the abutment collar 20, the
piston I9 is then inserted into the barrel 2 and
ened inner part 43 medially perforated with
which the correspondingly formed inner end of
the catheter 44 can make a ?uid tight joint
when the tubes 44 and 45 are telescoped and the
device is housed in a suitable two-part con
tainer 46 adapted'to be screwed together to hold
the catheter 44 against the part 43.
Secure connection of the piston 39 with the
rubber sleeve may be e?ected by moulding the
thickened end thereof to a radial internal ?ange
39a of the piston wall by anchoring slots 3%.
The suction valve 41 is an expanding rubber
plug in the nozzle 48 and having a central way
41a and circumferential ways formed by spaces
411) between the tapered wall of the plug and the
tapered end of the nozzle leading to openings 49
in the nozzle 48 communicating with a central
bore 50c; When pressure is exerted against the
head of the plug by pressing this against the
bottom of va vessel the way 41a is sealed and
the spaces 47b sealed up by distortion of the
plug. The non-return valve is indicated by 48a.
On relative movement occurring between the
cylinder and the piston realized by pulsating or
reciprocating the cylinder whilst the nozzle or
catheter is pressed against the bottom of a vessel
of liquid, the suction valve 41 closes during the
stroke which pumps liquid into the elastic storage
10
15
20
25
chamber and opens when the pressure of the
nozzle against the bottom of the vessel of liquid 30
is released during the suction stroke.
.
By turning the sac 31’ inside out it is easy t
assemble the discharge valve body over the dis
charge valve and to spring the internal ?ange 40a
of the sac over the ?ange of the valve body 33. 35
The cylindrical wall of the sac 31 is then folded
back to its normal position and the barrel 30
slidden therein and engaged with the discharge
valve body 33. The open end of the sac is then
sprung over the locking shoulder on the barrel,
and the piston 39 is inserted into-the barrel and
the bead or ?ange of its rubber sleeve 42 sprung
over its'locking shoulder on the cylinder. The
the free edge of its elastic sleeve is folded over
telescopic members having been assembled to
gether the apertured conical nut 59 is passed 45
the corresponding end of the barrel 2, where
after, the telescopic members having been as
sembled together, the apertured conical nut 20,
is passed thereover and screwed onto the barrel.
In Fig. 2, the pump barrel 30 is provided with
thereover and screwed on to the barrel.
The two part container 46 for housing the de
vice may be so proportioned and arranged that
the container parts may be screwed together suf
?ciently to seal off the nozzle 48 by closing the 50
a screw threaded ?ange 32.
A flanged valve
body 33 is provided with a shouldered down screw
threaded portion 33a to screw into such screw
threaded ?ange 32.
-
plug suction valve 41 and sealing the medial per
foration- 41a therein as well as sealing off the
inner end of the catheter 44.
The appliances can beas readily disassembled
The part 33a. is provided with a seating with
which a discharging valve 34 co-operates. The
when desired.
barrel 30 is thus divided so as to form an end
sleeve 42 and its head 43 is anchored by anchoring
slots to a diiferentially threaded ring 55 screwed
externally to the tube 45 and internally to the
chamber which is in communication through
apertures 35 and 36 with the storage space be
tween the external wall of the barrel 30 and the
sac or bag 31, the remaining part 38 of the cyl
inder receiving the piston 39.
The end wall of the sac 31 has a thickened in
tegral central button-like part 40, a stem 4I
extending axially inwards from‘such button like
part 40, having the conical discharging valve
34. The end wall of the ‘sac or bag (I or 31)
is so arranged that the button lies ?ush with or
below the plane of the corresponding end of the
70 sac or bag so as to lessen'the risk of the dis
charge valve being opened inadvertently while
. UK C11
Fig. 3 shows a modi?cation in which the elastic
piston 39. Such an arrangement allows of easy 60
disconnection of the parts for cleaning or re
newal.
.
Fig. 4 shows a modi?cation in which the suc
tion valve is, situated in ‘the nozzle or telescopic
member 23 and in which provision is made for 65
the‘ insertion of interchangeable single channel
nozzles 56.
Fig. 5 shows a modi?cation in which the piston
60 has a screw union 6! with the tube 45.
70
According to the construction shown by Fig. 6,
v In Fig. 2 the. piston is in the form of an open’
the cylinder ‘II! has a closed end ‘II in which the
discharge, valve 12 is seated. ‘I3 is the sac and
ended cylinder 39 which‘surrounds the cylin
14 the non-return valve.
the device is being handled.’
7
75 drical wall of an elastic sleeve 42 having a thick
I
_
_
Fig. 7 shows a construction adapted to be ?lled 76
2,134,291
from a water-tap l?l by removal of a discharge
nozzle and ?tting a connector I00.
’ ~
In all cases the pump ?lling means including
the suction valve may be omitted where it is de
sired to rely only upon tap ?lling.
~
The syringe can be constructed almost entirely
of a phenolic condensation product, or like sub
stance, and rubber, so as to be of very light weight
and readily cleaned, disinfected and dried.
Apparatus according to the present invention is
10
well suited for manufacturing by moulding proc
esses.
What I claim is:
l. A syringe or the like of the kind herein
15 before referred to, comprising an inner rigid
tubular member, an outer elastic sac or bag
surrounding said rigid tubular member and com
pletely enclosing one end thereof, the end of such
sac being secured to such tubular member in a
20 ?uid tight manner and the said member being
constructed so as to form between its external
surface and the sac a ?uid-storing space, the
walls of the sac normally lying in close proximity
to the external surface of the tubular member
25 and being adapted to be expanded and elastically
energized by ?uid pressure, a ?uid inlet from the
'3
tween its externalsurface and the sac a ?uid
storing space, the walls of the-sac normally lying
in close proximity to the external surface of the ,
tubular member and being adapted to be ex
panded and elastically energized'by ?uid pres
sure, a ?uid inlet from the interior of said tubular
member to said storage space and a one way valve
controlling said inlet whereby to permit ?uid to
enter into said storage space and elastically en
ergize the walls of said sac, an outlet from said 10
storage space formed in that end wall of such
tubular member which is adjacent the end wall of
the sac and a regulatable push discharge valve
cooperating with‘ said outlet, said valve being
formed integrally in one piece with the end wall 15
of the sac and projecting inwardly from the
inner face of said wall, said valve being operable
by pressure on the end'wall of the sac so that
the ?uid can be automatically discharged from
the storage space by the pressure exercised by 20
the elastically energized walls of the sac.
4. A syringe or the like as claimed in claim 1,
in which the side walls of the sac ‘are attached in.
a ?uid tight manner to each end of said inner
tubular member.
\
25
5. A syringe or the like as claimed in claim 1,
interior of said tubular member to said storage
in which the push valve control is countersunk in
space and a one-way valve controlling said inlet
the normal condition of the syringe within the
tubular member so as to prevent accidental op
whereby to permit ?uid to enter intosaid storage
30 space and elastically energize the walls of said
sac, an outlet from said storage space and a regu
latable push discharge valve cooperating with
said outlet, said valve being situated inside the
eration.
'
’
‘
30
6. A syringe or the like of the kind hereinbe
fore referred to comprising an inner rigid tubular
member serving as a pump cylinder, an outer
sac and being operable by pressure on the sac _ elastic sac or bag ?tted over said inner rigid
35 so that the ?uid can be automatically discharged - tubular member so as to completely enclose one 35
from the storage space by the pressure exercised
by the elastically energized walls of the sac.
2. A syringe or the like of the kind hereinbe
fore referred to, comprising an inner rigid tubu
40 lar member, an outer elastic sac or bag ‘?tted
over said rigid tubular member so as to surround
said member and completely enclose one end
thereof, the side walls of such sac being secured
at each end to such tubular member in a fluid
45 tight manner and the said member being con
structed so as to form between its external sur
face and the sac a ?uid-storing space, the walls
of the sac normally lying in close proximity to
the external surface of the tubular member and
50 being adapted to be expanded and elastically en
ergized by ?uid pressure, a ?uid ‘inlet ‘from the
interior of said tubular member to said storage
space and a one way valve controlling said inlet
whereby to permit ?uid to enter into said stor
55 age space' and elastically‘ energize the walls of
said sac, an outlet from said storage space and a
regulatable push discharge valve cooperating
with said outlet, said valve being situated inside
the sac and being operable by pressure on the
60 sac so that the ?uid can be automatically dis
end thereof, the end of such sac or bag being se
cured to such tubular member in a ?uid‘ tight
manner so as to form a contractible storage space
between the walls of the sac or bag and the said
member, the said walls of the bag normally ly-_ '
ing in close proximity to the tubular member, a
one-Way valve controlled inlet to said storage
space for ?lling, a hollow stem extending axially
along the cylinder and carried by said tubular
member, ‘a pump’ piston movable along said
stem, and a regulatable push'dischargevalve sit
uated inside the sac and having its seating at the
‘outer end of said stem, at spindle connecting said
push discharge valve to the end wall of the sac,
said discharge valve being operable by pressure
on the sac, so that the ?uid is automatically dis
charged atla regulatable rate by reason of the
elastic contraction of the said storage space.
'7. A syringe or the like of ‘the‘kind hereinbe
fore referred to comprising an inner rigid cyl
inder or barrel, an outer elastic sac or bag ?tted
over said inner rigid tubular member so as to
completely enclose oneend thereof, the end of
such sac or bag being secured to such tubular
member in a ?uid tight manner so as to form a
charged from the storage space by the pressure
exercised by the elastically energized walls of
contractible storage space between the walls of
the sac, the end wall of the sac being adapted to
walls of the bag normally‘ lying in close proximity
to the tubular member, a piston‘in‘said cylinder,
a suction valve in said piston,’a one-way valve 65
be elastically energized when the discharge valve
65 is operated and serving elastically to force the
valve to close said outlet when the operating
pressure is removed.
3'. A syringe or the like of the kind hereinbe
fore referred to, comprising an inner rigid tubu
70 lar member, an outer elastic sac or bag ?tted over
said rigid'tubular member so as to surround said
member and completely enclose one end thereof,
the end ‘o'f'sucl'i sac‘ being “'e‘c“ ‘ ‘
“mental ‘iniaii'?iiid‘r‘tigh'
‘
75 im‘emb‘éi‘ being-‘constructed so“ 5' Z‘torrent ‘He?
the sac or bag and ‘the said member, the said ,
controlled inlet to said storage space, a hollow
stem extending axially along said cylinder, so as
to ‘divide the cylinderinto charging and dis
charging chambers, and a regulatable push dis
charge valve situated inside the sac' and seated 70
at the outer end ofv said stem, and operable by
pressure on the “sac, so that the fluid
‘matioally' di's’c
"ofitjh
4
2,134,291,
8. A syringe or the like of the kind herein
before referred to comprising an inner rigid
tubular member, a ?lling and discharging tube
communicating with the interior of said mem
ber, an outer elastic sac or bag ?tted over said
inner rigid tubular member so as to completely
enclose one end thereof, the end of such sac or
bag being secured to such tubular member in a
fluid tight manner so as to form a contractible
storage space between the walls of the sac or
bag and the said member, the said walls of the
bag normally lying in close proximity to the
tubular member, a one-way valve controlled in
let to said storage space for ?lling from the in
terior of the tubular member and expanding
the Walls of the sac, and a discharge outlet from
said storage space and a regulatable push dis
charge valve situated inside the sac and cooper
ating with said outlet, said discharge valve being
operable by pressure on the sac, so as to permit
the stored ?uid to be automatically discharged
at a regulatable rate by reason of the elastic con
traction of the said storage space.
9..A syringe or the like of the kind herein
der, an outer elastic sac or bag ?tted over said
inner rigid tubular member so as to completely
enclose one end thereof, the end of such sac or
bag being secured to such tubular member in a
?uid tight manner so as to form a contractible
storage space between the walls of the sac or
bag and the said member, the said Walls of the
bag normally lying in close proximity to the
tubularmember, a valve past which ?uid can be
pumped into said storage space to ?ll the latter
and expand the walls of the sac, a discharge out
let from said storage space and a regulatable
push discharge valve situated inside the sac and
cooperating with said outlet, said valve being
operable by pressure on the sac, so that the fluid
is automatically discharged at a regulatable rate
by reason of the elastic contraction of the said
storage space.
12. A syringe or the like of the kind herein:
before referred to comprising an inner rigid cyl
inder or barrel, an outer elastic sac or bag ?tted
over said inner rigid tubular member so as to
completely enclose one end thereof, the end of
such sac or bag being secured to such tubular
before referred to comprising an inner rigid _ member in a ?uid tight manner so as to form a
tubular member serving as a pump cylinder, a
?lling and discharging tube, and a piston con
nected thereto and working in said cylinder, an
outer elastic sac or bag ?tted over said inner
3D rigid tubular member so as to completelyenclose
one end thereof, the end of such sac or bag
being secured to such tubular member in a ?uid
contractible storage space between the walls of
the sac or bag and the said member, the said
walls of the bag normally lying in close prox
imity to the tubular member, a piston in said
cylinder or barrel, a suction valve in said piston,
a one way valve controlled inlet to said storage
space, a discharge outlet from said storage space
and a regulatable push discharge valve situated
tight manner so as to form a contractible store
inside the sac and cooperating with said outlet.
age space between the walls of the sac or bag
said valve being operable by pressure on the sac,
35 and the said member, the said walls of the bag '
normally lying in close proximity to the tubular
member, a one-way valve controlled inlet to said
storage space for ?lling by causing relative move
ment between the piston and the cylinder, a
valve adapted to be closed by the pressure ex
erted by the tube against the bottom of the
vessel from which the ?uid is being pumped into
the expansible storage chamber and automati
cally opened during the suction stroke, and a
45 discharge outlet from said storage space and a
so as to permit the ?uid to be automatically dis
charged at a regulatable rate by reason of the
.35.
elastic contraction of the said storage space.
13. A syringe or the like of the kind herein
before referred to comprising an inner rigid cyl 14.0
inder or barrel and an open ended piston working
therein so as to form a pump, a ?lling tube serv
ing also as a discharge tube, a suction valve in
said tube, said valve opening on the suction stroke
of said pump, an outer elastic sac or bag ?tted ‘ ,
regulatable push discharge valve situated inside
over said inner rigid tubular member so as to ‘
the sac and cooperating with said outlet, said
discharge valve being operable by pressure on the
sac,_so as to permit the ?uid to be automatically
discharged at a regulatable rate by reason of the
elastic contraction of the said storage space.
10. A syringe or the like of the kind herein
before referred to, comprising an inner rigid hol
low cylinder or barrel having an end wall, an
completely enclose one end thereof, the end of
such sac or bag being secured to such tubular
55 outer elastic sac or bag ?tted over said inner
rigid tubular member so that its end wall lies
adjacent to said end wall of the rigid cylinder,
the free end of such sac being secured to such
member in a ?uid tight manner so as to form
a contractible storage. space between the walls 50
of the sac or bag and the said member, the said *
walls of the bag normally lying in close proximity
to the tubular member, a discharge outlet from
said storage space and a regulatable push dis
charge valve situated inside the sac and co
operating with said outlet, said valve being in~
tegral with said sac, and being operable by pres
55
sure on the sac, so as to permit the ?uid to be
cylinder in a ?uid tight manner so as to form a
automatically discharged at a regulatable rate by
contractible storage space between the walls of
reason of the elastic contraction of the said 60
the sac and the said cylinder, the said walls
of the sac normally lying in close proximity to
the cylinder, a discharge opening in said end
wall of the cylinder and a regulatable push dis
65 charge valve situated inside the sac and seated
in said opening, said valve being operable by
pressure on the sac so as to permit the ?uid to
storage space.
14. A syringe or the like of the kind herein
before referred to comprising an inner rigid cyl
inder or barrel and an open ended piston working
therein and so as to form a pump, a telescopic 65
?lling tube serving also as a discharge tube, a
nozzle at the end of said tube, a valve in said
be automatically discharged at a regulatable
rate by reason of the elastic contraction of the
70 said storage space.
l1_. A syringe or the like of the kind herein
before referred to, comprising an inner rigid
nozzle, said valve opening on the suction stroke
tubular member serving as a pump cylinder, a
member in a ?uid tight manner so as to form a
?lling and discharging tube and a piston carried
by said tube and arranged to work in said cylin
contractible storage space between the walls of
the sac or bag and the said member, the said 75
75
of said pump, an outer elastic sac or bag ?tted
over said inner rigid tubular member so as to 70
completely enclose one end thereof, the end of
such sac or bag being secured to such tubular
2,134,291
walls of the bag normally lying in close proximity‘
to the tubular member, an outlet from said space
and a regulatable push discharge valve situated
inside the sac and cooperating with said outlet,
said valve being integral with said sac and oper
able by pressure on the sac, so as to permit the
?uid to be automatically discharged at a regu
latable rate by reason of the elastic contraction
of the said storage space.
15. A syringe or the like of the kind herein
10
before referred to comprising an inner rigid cyl-'
inder or barrel, an open ended piston working
therein, a ?lling tube serving also as a discharge
tube, a removable nozzle at the end of said tube,
15 an outer elastic sac or bag ?tted over said inner
5
rigid tubular member so as to completely enclose
one end thereof, the end of ‘such sac or bag being
secured ‘to such tubular member in a ?uid tight
manner so as to form a contractible storage space
between the walls of the sac or bag and the said 5
member, the said walls of the bag normally lying
in close proximity to the tubular member, a dis- 1
charge outlet from said space and a regulatable .
push discharge valve situated inside the sac and
cooperating with said outlet, said valve being 10
operable by pressure on the sac so as to permit
the ?uid to be automatically discharged at a
regulatable rate by reason of the elastic contracé
tion of the said storage space.
HANS HERBERT SCHULZ.
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