U.S. patent number 3,662,752 [Application Number 05/053,102] was granted by the patent office on 1972-05-16 for infusion device.
This patent grant is currently assigned to Japan Medical Supply Co., Ltd.. Invention is credited to Kousou Yokoyama.
United States Patent |
3,662,752 |
Yokoyama |
May 16, 1972 |
INFUSION DEVICE
Abstract
An infusion device in which a back-flow check valve is provided
at an opening communicated with an air and medical fluid injection
groove formed along the length of the needle body, said check valve
being made of a flexible material such as rubber or soft plastics
and having its forward end formed spherically or in other similar
configuration, with a slit being formed at the front thereof, and
whereby either air or liquid medicine, as the case may be, caused
to flow in the injected direction when so desired.
Inventors: |
Yokoyama; Kousou (Hiroshima,
JA) |
Assignee: |
Japan Medical Supply Co., Ltd.
(Hiroshima-ken, JA)
|
Family
ID: |
13289451 |
Appl.
No.: |
05/053,102 |
Filed: |
July 8, 1970 |
Foreign Application Priority Data
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Jul 12, 1969 [JA] |
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44/65523 |
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Current U.S.
Class: |
604/411;
604/405 |
Current CPC
Class: |
A61M
5/162 (20130101); A61M 2005/1623 (20130101) |
Current International
Class: |
A61M
5/162 (20060101); A61M 5/14 (20060101); A61m
005/00 () |
Field of
Search: |
;128/214R,214C,214.2,221
;222/81 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1,187,261 |
|
Mar 1959 |
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FR |
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1,225,859 |
|
Feb 1960 |
|
FR |
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1,464,988 |
|
Mar 1966 |
|
FR |
|
538,728 |
|
Aug 1941 |
|
GB |
|
Primary Examiner: Truluck; Dalton L.
Claims
What I claim is:
1. A fluid infusing instrument comprising:
a fluid collecting needle body having a sharpened end and having
formed therein a longitudinally extending central bore along the
length of said needle body for passage therethrough of liquid
medicine, said needle body also having a longitudinally extending
air and liquid medicine injection groove formed in the external
side wall of said needle body and along the length thereof, both
said bore and said injection groove extending parallel to each
other, said needle body including a side opening communicating with
said bore and located below said sharpened end;
a sheath concentrically mounted on said needle body, extending from
a point below said side opening and substantially the remaining
length of the needle body, said sheath including a branched
cylindrical portion which is located adjacent the bottom of said
sheath and which communicates with said air and liquid medicine
injection groove;
a hollow valve section consisting of said sheath and a cylindrical
structure in said branched cylindrical portion and a back-flow
preventive valve formed spherically of a flexible material with a
slit being formed at the front end thereof, and a hollow conduit
portion made of the same material as and integrally with said valve
section and disposed to permit passage of air and liquid medicine
only in the direction of injection, said valve being confined
within said branched cylindrical portion, whereby air or other
desired liquid medicine can be passed, as desired, in the injected
direction through said air and liquid medicine injection groove,
said back-flow preventive valve and said cylindrical structure.
Description
The present invention relates to an infusion set and more
particularly to an infusion device having an improved air and
liquid medicine flowing section.
In the course of a surgical operation, there often arises an
occasion when it is desired to mix some other medicine in a liquid
medicine or blood during infusing or transfusing of the liquid
medicine or blood from a vial or the like by an infusion or
transfusion means. An infusion device designed to meet such
necessity is proposed in co-pending Japanese Utility Model
Registration Application No. 58,543/68 filed on July 11, 1968 by
the same applicant as the present application. The infusion device
of the just mentioned application comprises a branched cylinder
provided at the base of the sheath of the needle body and in
communication with an air injection groove, a check valve provided
near the forward end of the fluid through-passage hole in said
branched cylinder, and a cylindrical structure having an internal
taper on its inner wall, whereby during infusion of a fluid
medicine from a medicine bottle, some other desired medicine may be
introduced into said medicine bottle through said cylindrical
structure and air injection groove and mixed in the main fluid
medicine. This infusion device, however, had several serious
defects. For instance, the check valve used in the air and liquid
medicine passage is small in size and is also of a type where the
valve body makes mechanical motion, so that such infusion device
runs into trouble during use and also could not stand long-time
use.
The present invention aims at overcoming all of such defects and
difficulties involved in the conventional devices, and it is
therefore a primary object of the present invention to provide a
novel and improved medical fluid infusing instrument characterized
by use of a back-flow preventing valve with a simple structure
having no mechanical movable parts such as have been used in the
previously known conventional devices in the air and liquid
medicine passage, so as to permit infusion and proper mixing, as
desired, of some other additive medicine into the vial of a
principal fluid medicine through said air and liquid medicine
passage during infusion of said principal liquid medicine to a
human body from the vial.
It is another object of the present invention to provide a novel
medical fluid infusing instrument which can stand long-time
use.
The above and other objects contemplated by the present invention
are accomplished by providing a novel medical fluid infusion
instrument comprising: a collecting needle body having a central
hollow for formed longitudinally thereof for passage of liquid
medicine and an air and liquid medicine injection groove formed
longitudinally in the side wall thereof, a sheath having a branched
cylindrical portion which is provided at the bottom of said sheath
in communication with said air and liquid medicine injection groove
and adapted to sheath or cover said needle body, and a cylindrical
structure provided with a back-flow preventing valve consisting of
a hollow valve section which is formed spherically or in other
similar configuration of a flexible material such as rubber or
resin so as to allow passage of air and liquid medicine only in the
direction of injection and which has a slit formed at its front
end, and a hollow conduit portion formed of same material as and
integrally with said valve section, said cylindrical structure
having a configuration to fit with said branched cylindrical
portion.
Now, the present invention will be described in more detail by way
of its preferred embodiment with reference to the accompanying
drawings, in which:
FIG. 1 is a front view partially broken away of a medical fluid
infusing instrument according to the present invention;
FIG. 2 is a partial vertical sectional view of the medical fluid
infusing instrument of FIG. 1;
FIG. 3 is an enlarged sectional view of a part of said infusing
instrument, showing the passage of air and liquid medicine;
FIG. 4a is a front view of a back-flow preventing valve used in the
air and liquid medicine passage in the present fluid infusing
instrument; and
FIG. 4b is a sectional view taken along the line 4b-- 4b of FIG. 4a
and in the direction of arrows in FIG. 4a.
Referring first to FIGS. 1 and 2, there is shown a medical fluid
infusing instrument, generally designated by reference number 1,
according to the present invention. Reference number 2 denotes a
fluid collecting needle body which has formed in its center and
longitudinally thereof a liquid medicine inlet 5 and an inner bore
3 for passage of liquid medicine leading to a bottom end portion
9a. At the top end of said needle body 2 is planted a needle 7 made
of a hard material such as metal. Denoted by reference number 6 are
the grooves for passage of liquid medicine which are formed on both
sides of the needle body so as to extend from the top end of said
needle body to the liquid medicine inlet 5. In the external wall of
said needle body 2 is formed a longitudinally extending air and
liquid medicine injection groove 4 which is reduced in width and so
arranged that one end is positioned closer to the top end of the
needle body 2 than to the liquid medicine inlet 5. Reference number
10 indicates a sheath covering the entire outer periphery of the
needle body 2 except for the opening of the liquid medicine inlet
5, whereby said air and liquid medicine injection groove 4 is also
covered, with only the end thereof being left exposed. Said sheath
10 is tapered toward its forward end so that the diameter of said
forward end will be substantially equal to that of the needle body.
At the base 12 of said sheath is provided a circular socket 13
which is adapted to receive a protuberance 8 on the base 9 of the
needle body to thereby secure the sheath to the needle body. Right
above the base of said sheath 10 is provided a protruding branched
cylindrical portion 11 arranged to connect to a cylindrical
structure 14 which has formed therein an air and liquid medicine a
bore 17 communicated with the air and liquid medicine injection
groove 4. As will be seen in the drawing (see FIG. 2), the inner
wall 16 of the cylindrical structure 14 is given a taper so as to
fit with a syringe or the like.
In the center of the inner end of said cylindrical structure 14 is
provided a back-flow preventive valve 25 (see FIGS. 4a and 4b)
which, as best shown in FIG. 3, consists of a hollow valve section
26 formed spherically or in other similar configuration with a
flexible material such as rubber or plastic, with a slit 26a being
formed at its front end, and a hollow conduit portion 27 made of
the same material as and integrally with said valve section 26. The
back-flow preventive valve 25 has an extremely simple structure as
shown and is so constructed that the slit 26a is opened only when
the pressure applied to its inner surface is higher than the
pressure applied to its outer surface so as to allow passage of air
or liquid medicine in the direction of arrow. Normally, the slit
26a is kept closed to inhibit movement of fluid. Reference number
28 designates a liquid dropping cylinder mounted between the bases
9 and 12, and 29 a cylindrical element in which a suitable filter
means 30 is installed and which is arranged to fit into the
cylindrical structure 14.
In use of the present invention, the pointed end of the needle body
2 is thrust into a rubber plug of a vial or the like in which
desired liquid medicine such as for example Ringer's solution is
contained in sealed state, whereby to supply said liquid medicine
into the liquid dropping cylinder 28, etc., through the liquid
medicine inlet 5 and the inner hollow portion 3. Usually, air is
injected into said vial through the flow passage hole 17, back-flow
preventive valve 25 and air and liquid medicine injection groove 4
to generate a positive pressure in said vial. In this case, since a
filter-installed cylindrical element 29 is provided in the flow
passage hole 17 in the cylindrical structure 14, any dust, germs or
other undesirable substances mixed in the air are eliminated. Thus,
when the pressure exerted by the cleaned air against the inner wall
of the back-flow preventing valve 25 exceeds the pressure against
its outer wall, the slit 26a is opened to produce an air stream
running in the direction indicated by arrow in the drawing. When
the pressures given to the inner and outer walls of the back-flow
preventive valve 25 are equal to each other, or when the pressure
against the outer wall is larger than that against the inner wall,
said slit 26a is kept closed to inhibit movement of air, so that
there is no outflow (back-flow) of air in said vial to the outside
of the fluid infusion instrument.
In the course of infusion of a liquid medicine, when it is desired
to mix therein some other desired liquid medicine, the
filter-attached cylindrical member 29 located in the passage 17 in
the cylindrical structure 14 is removed, and instead, a suitable
syringe or the like is fitted thereinto whereby to mix a desired
medicine into the vial through the same route as the above-said air
passage. The internal taper formed on the inner wall of the
cylindrical structure 14 facilitates fitting of the syringe or the
like thereinto. When other medicine is being mixed into the vial,
air injection into said vial is interrupted, but since the positive
pressure therein is not excessively reduced by introduction of such
other medicine into the vial, there is no need of halting the
liquid infusing operation. In this case, the back-flow preventing
valve 25 operates in just the same manner as in the case of air
injection, so that any back-flow of liquid medicine from the vial
to the outside thereof through the air and liquid medicine
injection groove 14 is perfectly inhibited.
Thus, according to the fluid infusing instrument of the present
invention, it is possible to mix in the liquid medicine, which is
being infused, other desired fluid medicine, whenever so desired,
quickly and with extreme ease. Particularly, in the present
invention, a back-flow preventing valve 25 having an extremely
simple construction with no mechanical movable parts such as used
in the conventional devices is employed in the air and liquid
medicine flowing passage in the instrument, so that any possibility
of causing serious troubles due to failure of check valve during
fluid infusing operation is obviated to ensure safety in operation,
and also the instrument can stand long use.
* * * * *