U.S. patent number 3,910,272 [Application Number 05/416,292] was granted by the patent office on 1975-10-07 for cannula for introducing a flexible catheter.
This patent grant is currently assigned to Transcodan Sven Husted-Andersen. Invention is credited to Hans Jurgen Forberg.
United States Patent |
3,910,272 |
Forberg |
October 7, 1975 |
Cannula for introducing a flexible catheter
Abstract
A cannula for the introduction of a flexible catheter comprises
a cannula having a wing of a foil material joined to each side and
it includes a cannula protective cap at a spaced location from a
guard cap for the catheter. An intermediate bacteria-proof shell
encloses the cannula between the protective cap and the guard cap
and it has two separable portions which are arranged in
juxtaposition over the wings. The protective shell includes
projecting portions to permit it to be spread open to cause a
corresponding movement of the wings and the breaking open of the
cannula. The protective shell is made preferably of a single molded
part which is joined together at a hinge but which includes a
separate foil hinge and which include inwardly projecting dogging
elements which engage against the wings after the lower portion of
the housing is engaged around the cannula. The half shell portions
are each provided with interengageable projections and recesses so
that the shell portions are locked together to form a
bacteria-proof joint.
Inventors: |
Forberg; Hans Jurgen (Lensahn,
Holst., DT) |
Assignee: |
Transcodan Sven Husted-Andersen
(DT)
|
Family
ID: |
5862174 |
Appl.
No.: |
05/416,292 |
Filed: |
November 15, 1973 |
Foreign Application Priority Data
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|
|
|
Nov 18, 1972 [DT] |
|
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2256748 |
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Current U.S.
Class: |
604/161;
604/162 |
Current CPC
Class: |
A61M
25/0637 (20130101) |
Current International
Class: |
A61M
25/06 (20060101); A61M 005/00 () |
Field of
Search: |
;128/214.4,221,DIG.16,348 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Truluck; Dalton L.
Attorney, Agent or Firm: McGlew & Tuttle
Claims
What is claimed is:
1. A bacteria-resistant packing for a cannula, comprising a tubular
protective cap for the cannula having a closed end and an opposite
opened end, a tubular catheter guard having a closed end and an
opposite opened end and adapted to contain a catheter, an
intermediate closed housing having an open chamber therein
comprising interengaged side walls having respective opposite top
and bottom, a connecting web extending between said bottoms of said
side walls, said tops being interengaged and closed, said housing
having oppositely spaced ends extending from the side wall bottoms
each end having an opening over which the open end of said catheter
guard and said protective cap extend, said protective cap and said
catheter guard being sealed with said intermediate housing when
said housing is closed, said intermediate housing side walls being
pivotal about a respective said bottom to open said intermediate
housing, said side walls having complementary projections and
recesses enclosed within said chamber and which interengage to form
a closed bacteria-resistant joint.
2. A bacteria-resistant packing for a cannula, according to claim
1, including a cannula, a wing extending upwardly from each side of
said cannula between said side walls of said intermediate housing
and being interengaged with respective ones of said side walls and
being spreadable by opening of said side walls to open said
housing.
3. A bacteria-resistant packing for a cannula, according to claim
1, wherein said interengaged projections and recesses are
staggered.
4. A bacteria-resistant packing for a cannula, according to claim
1, wherein said housing is made of a flexible material.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates in general to the construction of containers
and, in particular, to a new and useful antiseptic container
construction for a cannula for introducing a flexible catheter.
2. Description of the Prior Art
The present invention deals in particular with a channula for the
introduction of a flexible catheter and cannula is provided with a
protective cap and a catheter guard. There are known cannulas for
the introduction of a catheter into a blood vessel. With the aid of
the catheter, liquid is withdrawn from, or injected into the
vessel. The withdrawal or injection of the liquid must take place
under sterile conditions. With the cannulas known at the present
time, there is always a risk that, after the cannula has been taken
out of the sterile packing, germs or poisonous matter become
deposited on the cannula in the space between the cannula and the
catheter and in the slit opening of the cannula, and there is a
danger that these germs will pass into the vessel during the
subsequent introduction of the catheter. A further disadvantage is
that after the insertion of the cannula for example, blood
penetrates into the interspace between the catheter and the cannula
or it escapes from the slit opening of the latter. The escaping
blood comes into contact with the surrounding objects in the
ambient air which is not only troublesome but may lead to
infection.
In the known devices, the cannula can be broken apart or it is
formed of two pieces having a semicircular cross-section and is
capable of being taken apart. The rear end portions of the cannula
have the shape of a scissor handle and are firmly connected to the
protective tube of the catheter which is provided with tear strips.
By means of these tear strips, the protective tube of the catheter
is ripped open as soon as the cannula is withdrawn and broken apart
after the puncture. However, the danger that during the puncture
and manipulation, germs or other matter penetrate for example, into
the slits of the cannula and cause an infection is not eliminated
with this cannula construction either.
SUMMARY OF THE INVENTION
The present invention is based on the problem of improving a
cannula of the type described above so as to securely prevent an
infection during the manipulation and a contamination with the
escaping liquid. In accordance with the invention there is provided
a cannula which includes wing elements on each side which are held
in and enclosed by a bacteria-proof housing or shell which can be
easily opened and which is formed with interengageable projections
and recesses for locking the parts together and also which has a
receiving projection at one end for receiving a catheter guard and
a receiving projection at an opposite end for engaging with the
cannula protection cap so that it may be interfitted between the
cap and the guard.
The cannula of the invention has the advantage that after removing
the protective cap and during the subsequent manipulation, the rear
part as well as the part in the front of the cannula to be
introduced are tightly closed so that neither germs nor other
matter can penetrate into these regions, nor can blood escape
outwardly. After the puncture is made under these entirely sterile
conditions, the catheter tube is introduced into the vessel. The
sterile closure is maintained and blood cannot leak out. As soon as
the introduction of the catheter is terminated, the catheter guard
is removed, the cannula is withdrawn from the vessel and thereupon,
the shell is opened. The cannula is then taken away in a well-known
manner. The device in accordance with the invention ensures a
perfectly sterile manipulation and it is simple in construction and
inexpensive to manufacture.
In accordance with a further development of the invention, the
shell may be of a flat, easily engageable shape, and may comprise
two half shell portions which are connected to each other so that
they can easily be disconnected or torn apart. In a simple
embodiment of this arrangement, the half shells are provided with
projections or recesses extending along the inner edges of the
shells and they are adapted to engage with the respective opposite
projections or recesses of the other half shell so that a tight
closure of the space within the shell is obtained. The flat shape
of the shell facilitates manipulation.
In order to improve the sealing effect, the cross-sectional outline
of the projections or recesses are staggered in one or more steps
so as to be able to obtain a more suitable sealing joint. In
addition, the half shells or the projections and recesses may
engage into each other resiliently so as to interlock whereby the
shell is secured against unintentional opening. The shell is
advantageously made of a flexible material.
In order to form seats for the connection portions of the
protective cap and the catheter guard, the central portion forming
the bacteria-proof housing is provided with extensions of
complementary shape which are provided on the front and rear sides
of the half shell portions so that after closing of the shell, they
form the desired seats for the catheter guard and the protective
cap for the cannula. The sealing joint is not necessarily on the
periphery of the enclosed shell. It is even advantageous to provide
projections extending outwardly from each side of the shell housing
and make them in the form of grip tabs. A particularly simple
manufacture is an embodiment in which the two half shells are made
in one piece comprising two main parts with a central thin walled
strip therebetween. The thin walled strip may be a film hinge and
the parts may be folded together into interlocking closed
arrangement. Such a design may thus be used while manufacturing the
half shells as injection molded parts with the main walls aligned
on a common plane and connected to each other by the film
hinge.
In accordance with another advantageous embodiment of the
invention, there may be provided on the inner sides of the half
shells, catches engaging the wings of the cannula from behind so
that simultaneously with the opening of the shell, the wings are
drawn laterally and the cannula is bent or torn apart. The half
shells may be provided with an additional locking if desired.
Accordingly, it is an object of the invention to provide an
improved cannula for the introduction of a flexible catheter which
comprises a protective cap for the cannula and a guard for the
catheter and which includes a bacteria-proof housing surrounding
the cannula in the area of wing formations thereon which can be
easily opened and which is provided with two tight interengageable
seats, one for the connection piece of the protective cap of the
cannula, and another for the connection piece of the guard cap for
the catheter.
A further object of the invention is to provide a cannula for the
introduction of a flexible catheter which includes a catheter
having a protective cap at a spaced location from a guard cap for a
catheter and with an intermediate bacteria-proof shell housing
enclosing said cannula between said caps and having a portion
engageable with said caps to seal them against the outside and form
a bacteria-proof closure, said housing being composed of parts
which are readily spreadable to open the housing.
A further object of the invention is to provide a cannula for the
introduction of a flexible catheter, which is simple in design,
rugged in construction and economical to manufacture.
For an understanding of the principles of the invention, reference
is made to the following description of a typical embodiment
thereof as illustrated in the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the Drawings:
FIG. 1 is a side elevational view partly broken away of a device
for introducing a flexible catheter constructed in accordance with
the invention;
Fig. 2 is a cross-sectional view taken along the lines 2--2 of FIG.
1;
FIG. 3 is a cross-sectional view of the opened half shell housing
portions as they appear at the end of the manufacturing process
therefor;
FIG. 4 is an enlarged partial cross-sectional view taken along the
line 4--4 of FIG. 3; and
FIG. 5 is an end elevational view of the shell housing taken in the
same direction as the cross-sectional view of FIG. 2.
GENERAL DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings in particular, the invention embodied
therein, comprises a cannula 1, of a type capable of being broken
up or opened and it is provided on its rear side with two wings 2
and 3 which are secured to respective opposite sides and are formed
so as to overlap centrally over the cannula 1. The wings are shaped
so that they partly overlap as indicated in dotted lines in FIG. 1.
By making the wings so that they are shortened longitudinally, they
may be separately gripped. The wings serve as a means for tearing
or bending the cannula open after the puncture has been made and
the catheter is introduced.
The part of the cannula where the wings are provided is enclosed in
a shell or housing 4 which comprises two half shell portions 4a and
4b. The half shell portions 4a and 4b are held together by a film
hinge 5 and they may be manufactured as a single injection molded
piece in the form shown in FIG. 3 prior to their being bent
together to enclose over the cannula 1. In the case of manufacture
as a single housing made up of two half shell portions 4a and 4b,
the portions are placed together so as to extend in a common plane
and are connected to the film hinge 5. On their other three side
edges, the half shell portions are provided with projections 6
which, as shown in FIG. 2, are of such a shape that the projecting
portions engage together and form a sealing joint 7 of the type of
a labyrinth packing. In the position shown in FIG. 2, the half
shell portions 4a and 4b seal the enclosed space so that the space
is bacteria-resistant.
The component parts may be resilient and the sealing joint may be
conformed thereto so that the engaging portions interlock.
In order to facilitate the manipulation of each of the half shell
portions 4a and 4b, they are provided with grip tabs 8a and 8b
which protrude above the level of projections 6 and are offset from
each other, as shown in FIG. 1. An untimely and unintentional
opening of the shell may be made more difficult by providing a
further locking element 9 between the tabs 8a and 8b. As shown in
FIG. 3, the locking element 9 comprises a projection which engages
into a receiving recess on the opposite part.
The half shell portions 4a and 4b are provided on both sides with
approximately semicircular extensions 10 and 11, respectively,
which, in the closed position, form a complete tubular receiving
socket for engaging a connecting end portion 12 of a protective cap
13 for the cannula 1 and also for receiving the end portion 14 of a
catheter guard 15 at the opposite end of the housing 4.
Half shell portions 4a and 4b are engaged around the cannula 1 and
they bear against the wings 2 and 3 and hold them in place. After
removing the protective cap 13, the half shell portions 4a and 4b
serve as a handle for manipulating the cannula.
Catheter 16 is passed through the cannula and is provided with a
connection piece 17 and an aeration filter 18. On the righthand
side of FIG. 1, only a portion of the device is represented. The
guard 15 and catheter 16 are relatively long. Connecting end
portions 12 and 14 hold the parts of the sockets 10 and 11 in
assembled orientation so that shell 4 is prevented from
opening.
The half shell portions 4a and 4b are provided with dogs 19 on
their inner sides which may be of angular shape and which engage
behind each of the wings 2 and 3 in the closed position, as shown
in dotted lines in FIG. 4. As soon as the half shell portions 4a
and 4b are spread apart, the wings 2 and 3 follow this motion and
the cannula is bent or broken open.
The cannula 1, in accordance with the invention, is simple in
construction and inexpensive to manufacture. The manipulation is
also simple. This design prevents the contamination with germs or
other matter during manipulation with the cannula. The invention
offers a catheter device which is easy to sterilize and remains
sterile and free from pyrogens even after the removal of the
packing. Moreover, it is well manipulable.
The film hinge 5 may be made so as to easily tear. Instead of the
film hinge 5, of course, any other appropriate connection between
the two half shell portions 4a and 4b may be provided.
While a specific embodiment of the invention has been shown and
described in detail to illustrate the application of the principles
of the invention, it will be understood that the invention may be
embodied otherwise without departing from such principles.
* * * * *