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Патент USA US3044478

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July 17, 1962
w. c. BIRTWELL
3,044,468
CATHETER HAVING BUILT-IN INFLATION MEANS
Filed Dec. 1, 1958
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3,044,468
Patented July 17, 1962
2
will automatically be in?ated upon introduction of a con
3,044,468
CATHETER HAVING BUILT-IN INFLATION
NHEANS
‘William Clifford Birtwell, North Scituate, R.I., assignor
to Dave! Rubber Company, ‘Providence, R.I., a cor
poration of Rhode Island
a retention catheter of the character described which is
feasible for production manufacture and which is also
highly efficient in use.’
'
Other objects, features and advantages of the inven
tion will become apparent as the description thereof pro
Filed Dec. 1, 1958, Ser. No. 777,276
9 Claims. (Cl. 128—349)
'
necting tube to the proximal end of, the catheter.
A further object of this invention is the provision of
ceeds when considered in connection with accompanying
The present invention relates generally to surgical ap~ 10 illustrative drawings.‘
paratus and is more speci?cally concerned with retention
In the drawings which illustrate the best mode pres
catheters and the like.
ently contemplated by me for carrying out my invention:
The conventional retention catheter traditionally com
FIG. 1 is a elevational section of a catheter embody
prises an elongated ?exible shaft having a main lumen
ing my invention, the catheter being shown in de?ated
extending therethrough and having an in?atable retention 15 condition;
balloon mounted adjacent the distal end of said shaft.
FIG. 2 is an elevational section illustrating the catheter
An in?ating lumen extends through said shaft into com
of FIG. 1 in in?ated condition;
munication with the balloon whereby ?uid under pres
FIG. 3 is a fragmentary elevation illustrating the coni
sure may be forced through said in?ating lumen to'dis-tend
cal end of the connecting tube which is introduced to
the balloon. The in?ating means usually comprises some 20 the catheter of FIGS. 1 and 2 to in?ate same;
sort of separate and distinct equipment, such as a syringe
FIG. 4 is a fragmentary elevational section showing the
or hypodermic, which is interengaged with the free proxi
proximal end of a slightly modi?ed catheter construction,
mal end of the in?ating lumen.
'
the catheter being shown in its de?ated position;
The above described in?ating system has proven to be
FIG. 5 is a fragmentary elevation illustrating the cath
disadvantageous for numerous reasons. First of all, be 25 eter of FIG. 4 in its in?ated position;
fore the balloon can be in?ated it is essential that the
FIG. 6 is a section taken on line 6--6 of FIG. 4;
necessary in?ating equipment be available. Thus, if ‘for
FIG. 7 is a section taken on line 7——7 of FIG. 5;I
any reason a syringe, hypodermic or other in?ating de
vFIG. 8 is a fragmentary elevational section of another
vice does not happen to be present during catheterization
modi?cation of my invention, the catheter being shown
of the patient, or if such in?ating means have inadvert 30 in its de?ated position;
\
-
ently become misplaced, ti is virtually impossible to in
?ate the catheter balloon. And even where such in?at
ing equipment is available, there is always the possibility
FIG. 9 is a fragmentary elevation, partly in section,
illustrating the catheter of FIG. 8 in its in?ated position;
and
'FIG. 10 is a section taken on line lib-Ill of FIG. 8.
the degree of in?ation is completely within the control 35 Referring now to the drawings, and more particularly
that the balloon will be either under- or overin?ated since
of the operator.
’
Another important disadvantage which exists in the
to FIGS. 1 through 3 thereof, there is shown generally
at 10 a catheter of the so-called retention type having an
in?ation of prior art catheters is the fact that once the
elongated ?exible shaft 12 through which extends a main
catheter balloon has been in?ated, some sort of a seal
lumen 14. The catheter 10 is preferably of rubber con
or the like is necessary to maintain the in?ation. This 40 struction and may be made by a series of latex dips al
not only requires an additional device, but there also is
though it will be understood that, the techniques em~
the problem of effectively sealing the balloon in its in
ployed in the manufacture of my catheter form no part
?ated condition since, if a slow leak exists through the of the instant invention. It will further be understood
in?ation lumen, there will be no visual indication that
that it is not essential that the catheter be constructed‘
the balloon is not completely in?ated, particularly where 45 of rubber since the only requirement is that it have suffi
the in?ating medium is air.
cient ?exibility to enable effective catheteri'zation of the
And lastly, where the in?ation is provided by an out
patient to be accomplished without causing undue discom
side source there is always the problem of making sure
fort, and in this respect it has been ‘found that various
that the in?ating medium is properly sterilized.
plastics, such as polyvinyl, polyethylene, and polyure—
In order to oevrcome the afore-listed disadvantages, it 50 -thane, lend themselves'to the manufacture of catheters
is a primary object of my invention to provide a reten
of this type.
tion catheter or the like having a built-in in?ation system.
Adjacent to but spaced from the distal end 16 of cathe
Another important object of this invention is the pro
ter 10 there is provided an in?atable balloon 18, said bal
vision of a retention catheter or the like which may be
loon being shown in its de?ated condition in FIG. 1.
in?ated without the use of specialized in?ating equipment 55 Balloon 18 may be cemented to the shaft 12, although
such as a syringe, hypodermic or the like.
I prefer to utilize the manufactun'ngtechnique set forth
Another object is the provision of a catheter of the
in United States Patent No. 2,320,157. Distally of bal
character described so constructed as to positively prevent
loon 18 there is provided a drainage eye 20, and, as will
overin?ation of the catheter balloon.
be readily seen, said drainage eye communicates with
A further object is the provision of a retention catheter 60 main lumen 14‘.
or the like which is more easily and effectively main
In order to in?ate the balloon 18, there is provided an
tained in its in?ated condition.
in?ating lumen 22 extending longitudinally of shaft 12
Still another object is the provision of a device of the
and communicating with the interior of balloon 18 as at
character described wherein the extent of balloon in?ation
24. At its proximal end 26 the in?ating lumen 22 com
is always readily visible from a point outside the catheter
municates with. an enclosed reservoir 28 containing an
ized patient.
in?ating
medium 30. As will be seen most clearly from
An additional object is the provision of a retention
FIG. 1, catheter 10 is provided at its proximal end with
catheter or the like having ‘a built-in in?ation system
-a funnel portion 32, said funnel portion being hollow
whereby to de?ne the annular reservoir 28. Thus, when
70
ured.
‘
a conical connector 34 having an internal bore 36 is
It is also an important object of my invention to pro
thrust into the interior of funnel portion 32, as illustrated
vide a retention catheter wherein the catheter balloon
whereby the sterility of the in?ating medium is always in
3,044,468
a
-
A
niques employed in the construction of my novel and
improved catheter‘form no part of the instant invention,
=19
in FIG. 2, thereservoir 28 is depressed whereby the
in?ating medium 30 is forced through in?ating lumen
and it will be understood that various modes of manu
facture may be utilized. For example, it is possible to
introduce the in?ating medium to the catheter during
the manufacture and formation of the latter or, in the
alternative, the in?ating medium may be introduced to
the catheter reservoir through a specially provided aper
ture, after which the aperture would, of course, be ef
22 to balloon 18, thereby in?ating the latter. It there
fore will be apparent that balloon 13 is automatically
in?ated upon introduction of connector 34 to the proximal
end of catheter 1-0, and said balloon will remain in
?ated so long as the connector remains in its assembled
position.
‘In FIGS. 4 through 7 a slightly modi?ed form of my
invention is shown wherein the in?ating reservoir 38 is 10 fectively sealed.
Thus, it will be, seen that there has been provided in
‘of substantially cylindrical con?guration and is located
accordance with my invention a catheter which success
to one side of the enlarged catheter proximal end 40.
Reservoir 38 is preferablyvintegrally connected to fun
nel portion 40 throughout its length as at 42 whereby
fully achieves the various objects hereinbefore enumerat
ed. More specifically, my built-in in?ation system, no
a specially designed clamp 44 may be applied to depress
the reservoir 38‘forcing the in?ating medium 46 there
from through in?ating lumen ‘48 to in?ate the balloon
matter which form the structure may take, insures that
the catheter balloon may always be in?ated Without the
in a manner thought to be obvious.
equipment such as syringes, hypodermics or the like.
Also,‘ the amount of in?ating medium in the catheter
necessity of having available any specialized in?ating
More speci?cally, clamp 44, which may be of either
metal or plastic construction, comprises a pair of spaced
ring portions 50 merging with a pair of closely spaced
limits the degree of in?ation of the balloon, thereby posi
tively preventing overin?ation of the latter. Then, too,
walls 52. Thus, as the ring portions 50 are slid down
wardly over the enlaged catheter proximal end 40, the
adjacent walls 52 will function to depress reservoir 38 in
a mannerjthought to be obvious.
once the properly sterilized in?ating medium has been
scaled within the catheter, there is no possibility of this
‘medium ever becoming non-sterile. And lastly, if for
Referring now to FIGS. 8 through 10, still another
to de?ate, such de?ation would be readily and visually
discernible externally of the patient since the reservoir
any reason the balloon should inadvertently commence
form of my invention‘is illustrated. In this form of my
invention the in?ating reservoir 54 once again assumes
at the proximal end of the catheter would show some
degree of in?ation. ‘It might be pointed out that the
a substantially cylindrical con?guration, but, as will be
noted, said reservoir is not connected to the enlarged, '~
catheter proximal end 56. ,Quite to the contrary, the
only connection which exists between reservoir 54 and
the catheter is at the lowermost end of the former, it
being noted that said reservoir merges as at ‘58 and in—
tegrally connects with in?ating lumen 60. In the use
and operation of this form of my invention, it is con
templated that reservoir 54 will be rolled up upon itself,
as illustrated in FIG. 9, whereupon the in?ating medium
62 contained therein will be forced into and through in‘
?ating' lumen 60 to in?ate the catheter balloon. In or
actual degree of in?ation of’ the balloon is not critical
although normally the contents of the in?ation system will
be approximately 5 cos. In some cases, however, 30ccs.
may be used.
While there is shown and described herein certain spe
cific structure embodying the invention, it will be mani
fest to those skilled in the art that various modi?cations
and arrangements of the parts may be made without de
parting from the spirit and scope of the underlying in
ventive concept and that the same, is not limited to the
.particular forms herein shown and described except insofar
as indicated by the scope of the appended claims.
der to retain reservoir 54 in its rolled-up position and ‘
hence maintain'the catheter balloon in?ated, a suitable
I claim:
' 1. A catheter comprising an elongated ?exible shaft
clamp 64 may be provided, which clamp is adapted to
having a proximal end and a distal end, a main lumen
cooperate with the rolled-up reservoir in the manner
clearly shown in FIG. 9.
-.
One problem which has existed in the perfecting of
_ the instant invention has been occasioned by the fact that
where the catheter is of rubber construction, the in?at
' ing' medium ‘must be carefully chosen because of the
45 extending longitudinally through said shaft, an in?atable
balloon on said shaft adjacent the distal end thereof, an
in?ating lumen extending longitudinally of said shaft
and communicating with said balloon, a funnel portion
at the proximal end of said shaft for receiving a con
tendency of the rubber to absorb most liquids thereby 50 necting tube, and a built-in, depressible, ?uid-containing
‘reservoir located adjacent said funnel portion and com
resulting in a loss or decrease of the desirable physical
characteristics of the rubber and even occasionally caus—_
ing a deterioration of the rubber, such as swelling or the
like. "In addition, the in?ating medium must be non
municating with said in?ating lumen, whereby depressing
said reservoir forces the ?uid contained therein through
said in?ating lumen to said balloon to in?ate the latter,
toxic and entirely safe from a sanitary and surgical 55 said in?ating reservoir extending peripherally around said
stand-point should the catheter balloon everinadvertenb
‘ funnel portion.
2;; The catheter of claim 1 further characterized in
Tly break when inside a patient. ‘It has therefore been
found, and this constitutes, an important part of them
stant invention, that silicone oils, glycerine, and poly
that said in?ating reservoir comprises an elongated, sub
stantially cylindrical chamber connected throughout its
fact that the viscosity of the, fluid must be such as to en
?exible shaft having a proximal end and a distal end, a
able the ?uid to be readily forced through the in?ating
lumen into the balloon. In this respect, the low viscosity
an in?atable balloon on said shaft adjacent the distal
alkylene have proven, in that order, to be the most ac 60 length to one external sidev of said funnel portion and
extending longitudinally thereof.
ceptable. Another important feature which must be con
3. In combination, a catheter comprising an elongated
sidered when selecting a proper in?ating medium is the
silicone oils of .5-10‘ centistokes have proven to be the
most acceptable. Thus,;particul_arly where the catheter‘
is of rubber, the in?ating mediumnrust ,be carefully
"chosen so that it does ‘not react unfavorably with the
main lumen extending longitudinally through said shaft,
end thereof, an in?ating lumen extending longitudinally
of said shaft and communicating with said balloon, a
funnel portion at the proximal end of said shaft for
receiving a connecting tube, built-in, depressible, ?uid
material of which the catheter is constructed so that, it 70 containing reservoir located adjacent said funnel portion .
and communicating with said in?ating lumen, whereby
has the proper viscosity, and so that it is physioloically
depressing
said reservoir forces the ?uid contained there
acceptable. As above indicated, accelerated life tests
in through said in?ating lumen to said balloon to in?ate
have proven that silicone oils, glycerine, and polyalkylene
the latter, said in?ating reservoir comprising an elon
‘meet these requirements.
gated, substantially cylindrical chamber connected
75
As hereinbefore indicated, the manufacturing tech
3,044,468
throughout its length to one external side of said funnel
portion and extending longitudinally thereof, the com
bination further comprising a clamp member slidably
engageable with said funnel portion, said clamp member
having a pair of closely adjacent walls for depressing
said chamber as said clamp member slides inwardly
along said funnel portion.
4. In combination, a catheter comprising an elongated
?exible shaft having a proximal end and a distal end, a
6
7. The combination of claim 4 further characterized
in that said catheter is of rubber construction and said
in?ating ?uid is polyalkylene.
'
8. A, catheter comprising an elongated ?exible shaft
having a proximal end and a distal end, a main lumen
extending longitudinally through said shaft, an in?atable
balloon on said shaft adjacent the distal end thereof, an
in?ating lumen extending longitudinally of said shaft
and communicating with said balloon, a funnel portion
main lumen extending longitudinally through said shaft, 10 at the proximal end of said shaft for receiving a con
an in?atable balloon on said shaft adjacent ‘the distal
necting tube, and a depressible, ?uid-containing reservoir
end thereof, an in?ating lumen extending longitudinally
located vadjacent said funnel portion and communicating
of said shaft and communicating with said balloon, a
with said in?ating lumen, said reservoir and lumen being
funnel portion at the proximal end of said shaft for
de?ned by an integral one~piece construction wherein
receiving a connecting tube, built-in, depressible, ?uid 15 the ?uid contained in said reservoir is permanently sealed
containing reservoir located adjacent said funnel portion
and constitutes a permanent part of said catheter, where
and communicating with said in?ating lumen, whereby
by depressing said reservoir forces the ?uid contained
depressing said reservoir forces the ?uid contained there
therein through said in?ating lumen to said balloon to
in through said in?ating lumen to said balloon to in?ate
the latter, said in?ating reservoir comprising a chamber 20
extending peripherally around said funnel portion, the
combination further comprising a connecting tube hav
ing a conical end portion snugly engageable within said
shaft funnel portion so as to automatically depress said
chamber and in?ate said balloon upon introduction of 25
said conical end portion into said funnel portion.
5. The combination of claim 4 further characterized
in that said catheter is of rubber construction and said
in?ating ?uid is silicone oil.
6. The combination of claim 4 further characterizedv 30
in that said catheter is of rubber construction and said
in?ating ?uid is glycerine.
in?ate the latter.
‘
9. The catheter of claim 8! further characterized in
that said shaft, balloon and reservoir are of rubber con
struction, and said ?uid is silicone oil.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,235,142
Ichilian ____ __-_ _____ __ July 31,
2,480,041
Myller _______________ __ Aug. 23, 1949
1917
439,636
France ______________ __ Apr. 13, 1912
FOREIGN PATENTS
Disclaimer
3,044,468.-—William Clifford B irtwell, North Scituate, RI. CATHETER
HAVING BUILT-IN INFLATION MEANS. Patent dated July
17, 1962. Disclaimer ?led Dec. 8, 1965, by the assignee, Da'vol Rubber
Uompany.
Hereby enters this disclaimer to claim 2 of said patent.
[O?‘icial Gazette May 10, 1.966.]
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