Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
1996-02-23
2001-11-06
Sykes, Angela D. (Department: 3762)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S131000
Reexamination Certificate
active
06312410
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an auxiliary appliance for syringe fixation, and more specifically, it relates to the structure of an auxiliary appliance for syringe fixation for attaching a syringe which is filled up with a contrast medium to an injection head in a medical field.
2. Description of the Background Art
In recent years, various means for testing functions of human bodies have been developed. One of such means is angiography employing a high-speed scan CT for diagnosing the functions of circulatory organs of a human body. The angiography employing a CT is adapted to inject a contrast medium into a patient's body for diagnosing the functions of the circulatory organs through the contrast medium which is injected into the patient's body with the CT.
FIG. 11
shows an injection head
10
, which is generally employed for injecting a contrast medium into a human body. A syringe
300
which is previously filled up with a contrast medium is attached to the injection head
10
, and a piston
300
d
provided in the syringe
300
is gradually moved toward the forward end of the syringe
300
with a plunger
11
which is provided in the injection head
10
, as shown in FIG.
12
. Thus, the contrast medium is injected into the human body through a tube
301
which is attached to the forward end of the syringe
300
and a catheter or a winged needle (not shown).
The structure of the syringe
300
is now described with reference to FIG.
13
.
This syringe
300
has a cylindrical shape, so that an internal space which is defined by the piston
300
d
is filled up with the contrast medium. An injection port
300
a
having a tapered front end is provided on the forward end of the syringe
300
. The syringe
300
is further provided on its rear end with a flange
300
b
and a pair of convex parts
300
c
, to be engaged with the injection head
10
, which are provided on opposite positions.
On the rear side of the piston
300
d
, connection parts
300
f
to be connected with an oval connection part which is formed on the forward end of a plunger
11
provided on the injection head
10
are provided on positions rotated by 90° with respect to the convex parts
300
c
to be opposed to each other.
With reference to
FIGS. 14 and 15
, attachment of the syringe
300
to the injection head
10
is now described.
As shown in
FIG. 14
, the injection head
10
is provided with an opening
12
having an inner peripheral surface
14
. Convex parts
13
to be engaged with the convex parts
300
c
which are provided on the syringe
300
are provided on opposite positions of the inner peripheral surface
14
.
Further, the plunger
11
is arranged in the opening
12
, to be connected with the piston
300
d
of the syringe
300
for moving the piston
300
d
toward the forward end of the syringe
300
.
The plunger
11
is provided on its forward end with a connection part including a neck portion which is smaller than the diameter of the plunger
11
and an oval head portion
11
a
, which is connected with the neck portion, provided with a curve portion having the same radius of curvature as the body part of the plunger
11
.
In the injection head
10
having the aforementioned structure, the syringe
300
is inserted in the opening
12
so that the convex parts
300
c
provided on the syringe
300
are positioned in concave portions which are defined by the convex parts
13
provided on the opening
12
of the injection head
10
, as shown in FIG.
14
.
Thereafter the syringe
300
is rotated by about 90° as shown in
FIG. 15
, whereby the convex parts
300
c
provided on the syringe
300
are positioned on rear sides of the convex parts
13
provided on the opening
12
so that the convex parts
13
of the opening
12
are engaged with the flange
300
b
and the convex parts
300
c
provided on the syringe
300
, thereby fixing the syringe
300
to the injection head
10
.
At this time, the head portion
11
a
provided on the plunger
11
is also connected to the connection part
300
f
which is provided on the piston
300
d
simultaneously with rotation of the syringe
300
.
However, only the syringe
300
having the structure shown in
FIG. 13
can be attached to the injection head
10
having the structure shown in
FIGS. 14 and 15
. On the other hand, a syringe
2
having a structure shown in
FIG. 16
is also put on the market, in addition to that shown in FIG.
13
.
The syringe
2
shown in
FIG. 16
has a cylindrical body part
6
, an injection port
7
which is provided on the forward end for injecting a contrast medium, and a flange part
5
which is provided on the rear end for defining an opening. Further, a piston
3
having a female screw
3
a
on the rear end of the syringe
2
is provided in the body part
6
, so that an internal space which is defined by the piston
3
is filled up with a contrast medium
4
.
When the syringe
2
shown in
FIG. 16
can also be attached to the injection head
10
shown in
FIGS. 14 and 15
, therefore, it is possible to select two types of syringe shapes in the medical field, thereby improving handiness of persons concerned with medical treatment.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an auxiliary appliance for syringe fixation, which can attach syringes of different shapes to a general injection head.
The present invention is directed to an auxiliary appliance for syringe fixation, for fixing a syringe having a cylindrical body part, comprising an injection port and a flange part defining an opening on front and rear ends thereof respectively, and sealing a liquid in an internal space which is defined by a piston having a connection part on the flange part side in the interior of the body part to an injection head which is provided with an opening having an inner peripheral surface which is provided with an engaging convex part and comprising a plunger having a connection part including a neck portion which is smaller than the diameter of its body part and a substantially oval head portion which is connected to the neck portion with a curve portion having a radius of curvature which is identical to that of the body part on its forward end part for moving the piston in the syringe toward the forward end of the syringe in the opening and injecting the liquid from the syringe through the injection port, and the auxiliary appliance for syringe fixation comprises a flange fixation appliance for fixing the flange part of the syringe to the injection head, and a piston connection appliance for connecting the piston to the plunger.
Thus, it is possible to connect a syringe, having the aforementioned shape which cannot be directly connected to the aforementioned injection head having an opening, to such an injection head through the flange fixation appliance and the piston connection appliance.
Consequently, two types of syringes having different shapes can be attached to a single injection head, whereby it is possible to improve convenience for doctors and nurses in the medical field.
Preferably, the flange fixation appliance comprises a cylindrical body part, a projection which is engaged with the engaging convex part provided on the inner peripheral surface of the opening of the injection head on an end of the body part for fixing the flange fixation appliance itself to the injection head, and a syringe fixation part for fixing the flange part of the syringe on the other end of the body part.
Thus, the projection can be reliably engaged with the engaging convex part which is provided on the inner peripheral surface of the opening of the injection head, whereby the flange fixation appliance itself can be reliably fixed to the injection head. Further, the flange part of the syringe can be reliably fixed to the syringe fixation part.
Further preferably, the syringe fixation part comprises a flange receiving part for supporting the syringe from the rear end and the outer side of the flange part, and a pair of holding members supporting the flange part of th
McDermott & Will & Emery
Sugan Co., Ltd.
Sykes Angela D.
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