WO2015079472A1 - Disposable self-shielding syringe - Google Patents

Abstract

[Problem] To provide a disposable self-shielding syringe which can be handled easily with one hand. [Solution] A disposable self-shielding syringe comprising: a syringe provided with at least a syringe main body, a plunger rod, and a needle; a tubular main body; a shielding tube; a circular latch member; and a spring material. A hook portion of the circular latch member catches on a tip of the spring material, thereby compressing the spring material between a flange of the tubular main body and the hook portion of the circular latch member, and exposing the needle disposed in a front part of the syringe main body from the shielding tube. When the shielding tube is drawn toward a rear part of the syringe main body, a latch release portion of the shielding tube pushes out the hook portion of the circular latch member toward the outside of the circular latch member, releasing the hook portion of the circular latch member from the spring material, and the shielding tube moves in a direction to shield the needle by the resilience of the spring material, whereby the needle disposed in the front part of the syringe main body is shielded by the shielding tube.

Description

Disposable self-shielding syringe

The present invention relates to disposable self-shielding syringes, and in particular to disposable self-shielding syringes in which the injection needle is shielded by a tubular cover after use of the syringe.

Syringes are used in normal medical activities, but if the injection needle installed in the syringe used for treatment is accidentally bitten by a medical worker or waste disposal contractor, pathogens, viruses, etc. may become infected. is there.
In addition, when the needle installed in the syringe used for treatment is inadvertently reused, the patient may be infected with a pathogen, a virus or the like attached to the needle.
In order to prevent such an infection accident, a syringe provided with a protective cover has been proposed (Patent Document 1).

The syringe with the protective cover can slide the protective cover in the longitudinal direction of the syringe. Before injecting the patient, the protective cover of the syringe with the protective cover can be fixed at a position where the injection needle is exposed with respect to the syringe body, and after injecting the patient, the protective cover is attached. The protective cover of the syringe can be fixed at a position where the injection needle shields relative to the syringe body.
In the case of the syringe with the proposed protective cover, the syringe with the protective cover can be used safely because the injection needle can be shielded after the injection.

However, when the doctor or the like who performs injection slides the protective cover relative to the syringe body, it is necessary to slide the protective cover relative to the syringe body with the hand opposite to the hand holding the syringe .
When sliding the protective cover against the syringe body by hand, there is a possibility that an accident may occur in which the injection needle is stuck in the hand, and the doctor who performs the injection uses the syringe with the protective cover to inject In doing so, it was necessary to use both hands, and there was a problem that performing other operations simultaneously with injection was limited.

On the other hand, as another prior art of a syringe having a protective cover, it has a cylindrical main body for storing the syringe main body inside, and a cylindrical protective cover which can slide in the longitudinal direction of the syringe main body. A syringe has been proposed in which an external expansion latch member is installed (U.S. Pat. No. 5,958,015).
A plunger rod is inserted into the proximal end of the syringe body. An injection needle may be placed at the distal end of the syringe body.
The external expansion latch member has a claw on the side of the syringe body, and also has an expansion arm projecting outward of the syringe body in the longitudinal direction of the syringe body.
Further, the claw portion of the external expansion latch member is hooked on the proximal end of the cylindrical main body, and the cylindrical protective cover is fixed so as not to move with respect to the cylindrical main body.
In the case of a syringe in which the external expansion latch member is installed on the cylindrical protective cover, when the plunger rod inserted in the syringe body is pushed, the expansion arm of the external expansion latch member is the inside of the flange at the end of the plunger rod Contact Further, pushing the plunger rod of the syringe causes the expansion arm of the outer expansion latch member to curve outwardly relative to the syringe body.
As a result of the extension arms of the external expansion latch member being curved outward with respect to the syringe body, the claws of the external expansion latch member engaged with the cylindrical body are disengaged from the proximal end of the cylindrical body, The cylindrical protective cover is movable in the longitudinal direction of the cylindrical main body.
Further, when the plunger rod of the syringe is pushed, the external expansion latch member pushes the protective cover, and the protective cover shields the injection needle installed in the syringe.

However, in the case of the syringe in which the external expansion latch member is installed in the cylindrical protective cover, the external expansion latch member is curved outward with respect to the syringe main body while the doctor or the like injects the patient. . A doctor or the like needs to hold the syringe so as not to prevent this bending, and there are cases where the operation is not easy.

JP 2003-225308 A Japanese Patent Publication No. 2003-532500

It is an object of the present invention to provide a disposable self-shielding syringe which can be easily handled with one hand.

As a result of intensive investigations by the present inventors to solve the above problems,
A syringe comprising at least a syringe body, a plunger rod and a needle;
A tubular body into which the syringe body is inserted;
A shielding cylinder into which the cylindrical main body is inserted and which can be moved in the central axis direction of the cylindrical main body;
An annular latch member disposed outside the cylindrical main body and insertable into the inside of the shielding cylinder;
A spring material installed on the outside of the cylindrical main body,
Equipped with
The annular latch member is disposed at an end portion of the annular main body, a latch portion projecting from the annular main body in a direction horizontal to the central axis direction of the cylindrical main body, and an end of the latch portion, and protrudes inside the annular main body And has a claw portion,
The shield cylinder has a rear expanded cylinder portion capable of accommodating the latch portion of the annular latch member,
The shielding cylinder has a latch release portion which protrudes in the horizontal direction with the central axis direction of the cylindrical main body on the inner side of the shielding cylinder and on the side of the rear extended cylinder portion,
The cylindrical main body has a buttock,
When the claw portion of the annular latch member is hooked on the tip of the spring member, the spring material is compressed between the flange portion of the cylindrical main body portion and the claw portion of the annular latch member, and the front of the syringe body The injection needle installed in the unit is exposed from the shield cylinder,
When the shield cylinder is pulled toward the rear of the syringe body, the latch release part of the shield cylinder spreads the claws of the annular latch member outward of the annular latch member, and the claws of the annular latch member The spring member is removed, the shield cylinder is moved in the direction to shield the injection needle by the repulsive force of the spring member, and the shield cylinder shields the injection needle installed at the front of the syringe body It has been found that disposable self-shielding syringes meet the object of the present invention, resulting in the completion of the present invention.

That is, the present invention
[1] A syringe comprising at least a syringe body, a plunger rod and a syringe needle,
A tubular body into which the syringe body is inserted;
A shielding cylinder into which the cylindrical main body is inserted and which can be moved in the central axis direction of the cylindrical main body;
An annular latch member disposed outside the cylindrical main body and insertable into the inside of the shielding cylinder;
A spring material installed on the outside of the cylindrical main body,
Equipped with
The annular latch member is provided at an annular main body, a latch portion projecting from the annular main body in a direction horizontal to the central axis direction of the annular main body, an end of the latch portion, and a claw projecting to the inside of the annular main body Have a department,
The annular latch member is fixed to the tubular body;
The shield cylinder has a rear expanded cylinder portion capable of accommodating the latch portion of the annular latch member,
The shielding cylinder has a latch release portion which protrudes in the horizontal direction with the central axis direction of the cylindrical main body on the inner side of the shielding cylinder and on the side of the rear extended cylinder portion,
The cylindrical main body has a buttock,
When the claw portion of the annular latch member is hooked on the tip of the spring member, the spring material is compressed between the flange portion of the cylindrical main body portion and the claw portion of the annular latch member, and the front of the syringe body The injection needle installed in the unit is exposed from the shield cylinder,
When the shield cylinder is pulled toward the rear of the syringe body, the latch release part of the shield cylinder spreads the claws of the annular latch member outward of the annular latch member, and the claws of the annular latch member The spring member is removed, the shield cylinder is moved in the direction to shield the injection needle by the repulsive force of the spring member, and the shield cylinder shields the injection needle installed at the front of the syringe body , Providing a disposable self-shielding syringe.

Moreover, one of the present invention is
[2] When the plunger rod of the syringe can move relative to the syringe body, the shield cylinder does not move relative to the annular latch member,
The above-mentioned [1], wherein the shield cylinder can be pulled toward the rear of the syringe body after the plunger rod of the syringe abuts on the tip of the syringe body and can not move relative to the syringe body Provide a disposable self-shielding syringe.

Moreover, one of the present invention is
[3] The cylindrical main body has a claw portion protruding to the outside of the cylindrical main body,
The shield cylinder has a first opening,
When the plunger rod of the syringe can move relative to the syringe body, the claw of the tubular body hooks on one end of the first opening of the shield cylinder, whereby the shield cylinder is the cylindrical body Do not move against
After the plunger rod of the syringe abuts on the tip of the syringe body and can not move, the other end of the first opening of the shield cylinder pushes down the claw portion of the cylinder body, whereby the shield cylinder is The disposable self-shielding syringe according to the above [1] or [2], which is movable with respect to the tubular body.

Moreover, one of the present invention is
[4] The shield cylinder has a second opening,
The claw portion of the cylindrical main body after the other end of the first opening of the shield cylinder pushes down the claw portion of the cylindrical main body, after the shield cylinder becomes movable with respect to the cylindrical main body. Hangs on the second opening of the shield cylinder, so that the shield cylinder does not move relative to the cylindrical body, and the shield cylinder shields the injection needle installed at the front of the syringe body , The disposable self-shielding syringe as described in the above [3].

Moreover, one of the present invention is
[5] The disposable self-shielding syringe according to any one of the above [1] to [4], wherein the shielding cylinder comprises a finger grip.

The disposable self-shielding syringe of the present invention is very easy to handle because it can be easily handled with one hand.
Moreover, according to the disposable self-shielding syringe of the present invention, it is possible to prevent an accident in which the injection needle installed in the syringe used for the treatment is accidentally stuck on a medical worker, a waste disposal company or the like.

FIG. 1 is a schematic cross-sectional view for explaining a syringe used in Example 1. FIG. 2 is a schematic front view for explaining the cylindrical main body 20. FIG. 3 is a schematic side view showing the rear side surface of the cylindrical main body 20. As shown in FIG. FIG. 4 is a schematic side view showing the front side surface of the cylindrical main body 20. As shown in FIG. FIG. 5 is a schematic plan sectional view showing the section of the cylindrical main body 20. As shown in FIG. It is a model front view for demonstrating the annular latch member installed in the outer side of the said cylindrical main body. FIG. 7 is a schematic side view showing the rear side of the annular latch member. FIG. 8 is a schematic side view showing the front side of the annular latch member. FIG. 9 is a schematic plan view for explaining an annular latch member. FIG. 10 is a schematic front view for explaining the shielding cylinder 40. As shown in FIG. FIG. 11 is a schematic side view showing the rear side surface of the shield cylinder 40. As shown in FIG. FIG. 12 is a schematic side view showing the front side of the shield cylinder 40. As shown in FIG. FIG. 13 is a schematic plan view for explaining the shielding cylinder 40. As shown in FIG. FIG. 14 is a schematic front sectional view showing the shielding cylinder 40. As shown in FIG. FIG. 15 is a schematic plan sectional view showing the shielding cylinder 40. As shown in FIG. FIG. 16 is an exploded schematic view of the disposable self-shielding syringe 100 according to the first embodiment. FIG. 17 is a schematic view of the disposable self-shielding syringe 100 according to the first embodiment. FIG. 18 is a schematic cross-sectional view for explaining a state in which the plunger rod is pushed. FIG. 19 is a schematic cross-sectional view for explaining a state immediately before the latch member is released. FIG. 20 is a schematic cross-sectional view for explaining a state in which the latch member of the shield cylinder is released and the shield cylinder is moved in the front direction of the syringe body.

The invention will now be described in detail on the basis of examples with reference to the drawings. The present invention is not limited at all by the following examples.

Although the invention according to the first embodiment relates to a disposable self-shielding syringe, the syringe used in the first embodiment will be described first.
FIG. 1 is a schematic cross-sectional view for explaining a syringe used in Example 1.
As shown in FIG. 1, the syringe 1 used in the first embodiment has a discharge hole 4 in the front 3 and a opening 6 in the rear 5 of the syringe body 2. Further, a collar 7 is provided in the opening 6.
In the disposable self-shielding syringe of the present invention, of the syringe 1, the side with the discharge hole 4 is the front, and the side with the opening is the rear. Further, the central axis of the syringe 1 is illustrated by a dashed dotted line aa.

The shape of the syringe body 2 may be a circle, a polygon, an ellipse, or the like with reference to a cross section perpendicular to the central axis of the syringe 1.
The shape of the syringe body 2 is preferably circular from the viewpoint of preventing stress concentration on a part of the inside of the syringe body 2. The syringe body 2 used in Example 1 is a cylinder, and its cross section is circular.

Further, an injection needle, a protective cap and the like can be attached to the discharge hole 4 provided at the tip 3 of the syringe body 2. A circular opening 6 is provided in the rear portion 5 of the syringe body 2, and a drug, a liquid agent, a flexible sealing member or the like can be inserted into the inside of the syringe body 2 from the opening 6. In addition, medicines such as liquid medicine can be sucked into the inside of the syringe body 2 from the discharge hole 4 of the syringe body 2.

The syringe 1 is preferably a material capable of stably storing a drug such as a liquid drug therein.
Such materials include, for example, inorganic materials such as glass, polyesters such as polycarbonate and polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, and medical polymers such as cyclic polyolefins such as cycloolefin copolymer and cycloolefin polymer And organic materials such as

Also as shown in FIG. 1, the syringe 1 used in Example 1 comprises a flexible sealing member 8 and a plunger rod 10.
The flexible sealing member 8 is connected to the tip of the plunger rod 10 and is inserted into the inside of the syringe body 2.
By pressing the flange 11 of the plunger rod 10, medicines such as a liquid agent in the inside of the syringe body 2 can be discharged from the injection needle installed in the front portion 3 of the syringe body 2.

The shape of the front flexible sealing member 8 is a cylinder, and has a protrusion 8 a and a groove 8 b on the side surface.
The front flexible sealing member 8 is formed of an organic material such as a medical flexible polymer such as silicone rubber.
The cross section of the projecting portion 8 a of the front flexible sealing member 8 is a circle larger than the cross section of the syringe body 2 with reference to a plane perpendicular to the central axis of the syringe body 2.
When the front flexible sealing member 8 is inserted into the inside of the syringe body 2, the protrusion 8 a of the front flexible sealing member 8 is contracted in the central axis direction of the syringe body 2.
For this reason, the outer peripheral shape of the front flexible sealing member 8 can be matched with the inner peripheral shape of the syringe main body 2 on the basis of the vertical surface to the central axis of the injection main body 2.

By providing the groove portion 8 a in the front flexible sealing member 8, the contact friction between the outer surface of the front flexible sealing member 8 and the inner surface of the syringe body 2 can be reduced. As a result, the front flexible sealing member 8 can be freely moved in the central axis direction of the injection body 2 inside the syringe body 2.

Next, the cylindrical main body used for Example 1 is demonstrated.
2 is a schematic front view for explaining the cylindrical main body 20, FIG. 3 is a schematic side view showing the rear side surface of the cylindrical main body 20, and FIG. 4 is a front view of the cylindrical main body 20. FIG. 5 is a schematic side view showing a side surface, and FIG. 5 is a schematic plan cross-sectional view showing a cross section of a cylindrical main body 20.

The cylindrical main body 20 has an opening 21 at the front of the front cylindrical main body 20 and an opening 22 at the rear. The central axis of the cylindrical main body 20 is illustrated by a dashed dotted line b-b.
Further, claws 23 are formed on the cylindrical main body 20. Openings 24 and 24 are provided around the claws 23 and 23 so that the claws 23 and 23 can bend with respect to the cylindrical main body 20.
Further, protrusions 25, 25 are provided at the tips of the claws 23, 23.

On the side surface of the cylindrical main body 20, the expanded portions 26, 26 and the expanded portion 27 are installed. The extended portions 26 are disposed on a part of the side surface of the cylindrical main body 20, while the extended portions 27 are disposed on the entire periphery of the side surface of the cylindrical main body 20.

The contact area of the inside of the shielding cylinder 40 installed in contact with the outside of the expanded portions 26, 26 of the cylindrical main body 20 and the expanded portion 27 by adjusting the area of the expanded portions 26, 26 and the expanded portion 27 Can be adjusted.
If the contact area is increased, the shielding cylinder 40 is less likely to move relative to the cylindrical main body 20, and if the contact area is reduced, the shielding cylinder 40 is more easily moved than the cylindrical main body 20. Become.
By adjusting this contact area, it is possible to prevent the shield cylinder 40 from moving relative to the annular latch member 30 while pushing the plunger rod 10 of the syringe 1.

Further, an opening 24 a is provided on the side surface of the cylindrical main body 20.
Further, a collar portion 28 is installed at the rear of the cylindrical main body 20. Further, fixing projections 29, 29 for fixing the collar 7 of the syringe body 2 are installed in the collar 28.
Further, a protrusion 28 a is provided on the outer periphery of the collar 28.

The material of the cylindrical main body 20 used in the present invention is, for example, medical materials such as polyesters such as polycarbonate and polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, cyclic polyolefins such as cycloolefin copolymer and cycloolefin polymer Organic materials such as polymers can be mentioned.
The same applies to the materials used for the annular latch member 30 and the shielding cylinder 40 described below.

Next, the annular latch member 30 used in the first embodiment will be described.
FIG. 6 is a schematic front view for explaining an annular latch member installed outside the cylindrical main body, FIG. 7 is a schematic side view showing a rear side surface of the annular latch member, and FIG. It is a model side view showing the front side of an annular latch member.
FIG. 9 is a schematic plan sectional view for explaining an annular latch member.
The annular latch member 30 includes an annular body 31, a latch 32, claws 33 and an annular projection 34.
The latch portion 32 protrudes from the annular main body 31 in the direction parallel to the central axis direction (one-dotted broken line cc) of the annular main body 31. Further, the claw portion 33 is disposed at an end portion of the latch portion 32 and protrudes to the inside of the annular main body 31.
The latch portion 32 can be bent in the direction perpendicular to the central axis of the annular main body 31.

Inside the annular projection 34, a groove 34a is provided, to which the projection 28a installed on the outer periphery of the collar 28 of the cylindrical main body 20 can be fitted.
The collar portion 28 of the cylindrical main body 20 can be fitted into the inside of the annular projection 34 without a gap.
The annular latch member 30 can be fixed to the cylindrical main body 20 by fitting the collar portion 28 of the cylindrical main body 20 to the inside of the annular projection 34 without a gap.
Further, even if the spring member 60 is compressed between the annular latch member 30 and the flange portion 28 of the cylindrical main body 20, the annular latch member 30 is fixed to the cylindrical main body 20. The spring member 60 can be maintained in a compressed state as long as the claws 33 of the member 30 do not come off the tip of the spring member 60.

Next, the shield cylinder 40 used for Example 1 is demonstrated.
10 is a schematic front view for explaining the shielding cylinder 40, FIG. 11 is a schematic side view showing the rear side surface of the shielding cylinder 40, and FIG. 12 shows the front side surface of the shielding cylinder 40. 13 is a schematic plan view for explaining the shielding cylinder 40, FIG. 14 is a schematic front sectional view showing the shielding cylinder 40, and FIG. It is a schematic plan cross section shown.

The shield cylinder 40 has a shield cylinder main body 41, finger grips 42, first openings 43, 43, and second openings 44, 44. Further, the shield cylinder main body 41 is provided with a rear expanded cylinder portion 45 having an inner diameter larger than the inner diameter of the shield cylinder main body at the rear of the finger grip 42.
Further, a connecting portion 46 is installed in the rear expanded cylindrical portion 45, and latch release portions 47, 47, 47, 47 project from the connecting portion 46 in the horizontal direction of the central axis of the cylindrical main body 20.
Further, the annular latch member 30 can be inserted into the rear expanded cylindrical portion 45 of the shielding cylinder 40.
The front shield cylinder 40 also has an opening 48 at the front and an opening 49 at the rear.

Next, the mutual relationship of the syringe 1, the plunger rod 10, the cylindrical main body 20, the annular latch member 30, and the shielding cylinder 40 will be described.
FIG. 16 is an exploded schematic view of the disposable self-shielding syringe 100 according to the first embodiment, and FIG. 17 is a schematic view of the disposable self-shielding syringe 100 according to the first embodiment.

As shown in FIG. 16, the syringe 1 is inserted into the tubular body 20. The outer surface of the syringe body 2 of the syringe 1 substantially coincides with the inner surface of the rear opening 22 of the tubular body 20.
Therefore, the syringe main body 2 can be inserted into the inside of the cylindrical main body 20.
Further, the inner width of the rear end protrusions 27, 27 of the cylindrical main body 20 substantially matches the width of the collar 7 of the syringe main body 2.
For this reason, the syringe body 2 is fixed to the cylindrical main body 20 by rotating and fitting the collar portion 7 of the syringe main body 2 between the rear end protrusions 28, 28 of the cylindrical main body 20. Can.

Next, the spring member 60 is inserted to the outside of the cylindrical main body 20.
Since the spring member 60 is in contact with the collar 28 of the cylindrical main body 20, the spring member 60 is positioned before the position of the collar 28 of the cylindrical main body 20 even when the spring material 60 is compressed. Will be installed.

Next, the cylindrical main body 20 is inserted into the annular latch member 30.
A claw 33 protrudes inside the annular latch member 30, and the claw 33 is hooked on the tip of the spring member 60.

Further, the inner diameter of the shielding cylinder main body 41 of the shielding cylinder 40 is smaller than the outer diameter of the spring member 60. Therefore, the spring member 60 can be compressed between the shield cylinder main body 41 and the collar portion 26 of the cylindrical main body 20.

When the annular latch member 30 is pushed toward the flange portion 28 of the cylindrical main body 20, the spring member 60 is maintained while the claw portion 33 of the annular latch member 30 is held on the tip of the spring member 60. It is compressed.
Further, when the annular latch member 30 is pushed to the flange 28 side of the cylindrical main body 20, the ridge 34 of the cylindrical main body 20 is formed in the groove 34 a installed inside the annular projection 34 of the annular latch member 30. The projections 28a provided on the outer periphery of the are fitted together.
Further, the shapes of the inner side of the annular projection 34 of the annular latch member 30 and the outer shape of the flange 28 of the cylindrical main body substantially coincide with each other, and the annular main body 31 of the annular latch member 30 and the cylindrical main body The flange portion 28 can be installed without any gap.
The protrusion 28 a and the groove 34 a are fitted to each other, the annular latch member 30 and the cylindrical main body 20 are fixed to each other, and the compressed state of the spring member 60 can be maintained.

Next, the shielding cylinder 40 is inserted to the outside of the cylindrical main body 20.
The inside of the shielding cylinder main body 41 of the shielding cylinder 40 and the outside of the expanded portions 26, 26 and the expanded portion 27 of the side surface of the cylindrical main body 20 can contact each other, and the central axis direction of the cylindrical main body 20 In addition, the shield cylinder 40 can be moved.
Further, since the inner diameter of the rear expanded cylindrical portion 45 of the shielding cylinder 40 is larger than the outer diameter of the spring member 60 and the annular latch member 30, the spring member 60 and the annular latch member 30 are expanded to the rear of the shielding cylinder 40 It can be inserted inside the cylindrical portion 45.
When the shielding cylinder 40 is inserted to the outside of the cylindrical main body 20, the claws 25 of the cylindrical main body 20 are hooked on the first openings 43, 43 of the shielding cylinder 40, respectively, and the shielding cylinder 40 is And the cylindrical main body 20 are fixed.
In the cylindrical main body 20 and the shielding cylinder 40, since the claws 25 of the cylindrical main body 20 hang on the first openings 43 of the shielding cylinder 40, respectively, the shielding cylinder 40 can maintain the state of not moving in the central axis direction of the cylindrical main body 20.

Further, since the shield cylinder 40 is drawn toward and fixed to the cylindrical main body side, the injection needle 70 installed at the front portion 3 of the syringe main body 2 of the syringe 1 is a front opening of the shield cylinder 40. The portion 47 is exposed to the outside of the shielding cylinder 40.

Next, an operation mechanism of the disposable self-shielding syringe 100 according to the first embodiment will be described.
FIG. 18 is a schematic cross-sectional view for explaining a state in which the plunger rod is pushed, and FIG. 19 is a schematic cross-sectional view for explaining a state just before the latch member is released.
FIG. 20 is a schematic cross-sectional view for explaining a state in which the latch member of the shield cylinder is released and the shield cylinder is moved in the front direction of the syringe body.
By pressing the flange 11 of the plunger rod 10 of the disposable self-shielding syringe 100, the liquid drug 80 inside the syringe 1 can be discharged.
When the flange 11 of the plunger rod 10 is further pushed, the tip of the plunger rod 10 abuts on the tip of the syringe body 2 through the flexible sealing member 8. After the tip of the plunger rod 10 abuts on the tip of the syringe body 2, the plunger rod 10 can not be moved relative to the syringe body 2.
While the plunger rod 10 can be moved with respect to the syringe body 2, the shield cylinder 40 maintains a fixed state with respect to the cylindrical body 20.

After the flange 11 of the plunger rod 10 becomes immobile relative to the syringe body 2, the shield cylinder 40 can be pulled towards the rear of the syringe body 10.
For example, the shield cylinder 40 can be pulled toward the rear of the syringe body 10 by pushing the flange 11 of the plunger rod 10 with a thumb and pulling the finger grip 42 with a forefinger and a middle finger.

When the shield cylinder 40 is pulled toward the rear of the syringe body 10, the other end of the first opening 43 of the shield cylinder 40 which is not in contact with the claws 23 of the cylindrical main body 20. When the claw portion 23 of the cylindrical main body 20 is pushed down, the claw portion 23 of the cylindrical main body 20 is disengaged from the first opening 43 of the shielding cylinder 40, and the shielding cylinder 40 becomes the cylindrical main body. It can move relative to it.
Further, the latch release portion 47 on the inner side of the shield cylinder 40 spreads the claw portion 33 of the annular latch member 30.
When the tip of the spring member 60 comes off from the claw 33 of the annular latch member 30 that has been spread out, the tip of the spring 60 pushes the connecting portion 46 of the shielding cylinder 40 by the repulsive force of the spring 60. The shield cylinder 40 is pushed forward with respect to the cylindrical main body 20.

As shown in FIG. 20, when the shield cylinder 40 is pushed forward by the repulsive force of the spring member 60, the shield cylinder 40 is positioned forward with respect to the central axis direction of the cylindrical main body 20. Move in the direction.
The claws 23, 23 of the cylindrical main body 20 hang on the second openings 44, 44 of the shielding cylinder 40 so that the shielding cylinder 40 stops its movement, and the shielding cylinder 40 has the cylindrical shape. It is fixed to the main body 20.
In a state in which the shielding cylinder 40 is fixed to the cylindrical main body 20, the shielding cylinder 40 shields the injection needle 70 installed at the front of the syringe 1.

As described above, the disposable self-shielding syringe 100 according to the first embodiment automatically uses the liquid drug 80 inside the syringe 1 and then automatically pulls the injection needle 70 when the shield cylinder 40 is pulled toward the rear of the syringe body 10. Can be shielded.
The disposable self-shielding syringe 100 can be easily operated with one hand, and the injection needle 70 is shielded by the shielding cylinder 40 after use, so that the injection needle 70 is a medical worker, a waste disposal company, etc. It is possible to reduce the sting accident.

The single-use syringe of the present invention can be easily handled with one hand, and therefore, it can be widely applied to medical research activities in medical institutions, research institutes such as universities, etc., treatment for non-human animals such as pets, medical research activities. can do.

DESCRIPTION OF SYMBOLS 1 Syringe 2 Syringe main body 3 Front part of syringe main body 4 Discharge hole of syringe main body 5 Rear part of syringe main body 6 Opening of syringe main body 7, 28 Collar 8 Flexible sealing member 8a Projection of flexible sealing member Part 8b Groove of flexible sealing member 10 Plunger rod 11 Flange 20 Cylindrical main body 21, 22, 38, 39 Opening 23, 33 Claws 26, 27 Extension 28a Protrusion 29 Fixing projection 30 Annular latch member Reference Signs List 31 annular main body 32 latch portion 34 annular projection 34 a groove 40 shield cylinder 41 shield cylinder main body 42 finger grip 43 first opening 44 second opening 45 rear extended cylindrical portion 46 connecting portion 47 latch release portion 60 spring member 70 Injection needle 100 disposable self-shielding syringe

Claims (5)

A syringe comprising at least a syringe body, a plunger rod and a needle;
A tubular body into which the syringe body is inserted;
A shielding cylinder into which the cylindrical main body is inserted and which can be moved in the central axis direction of the cylindrical main body;
An annular latch member disposed outside the cylindrical main body and insertable into the inside of the shielding cylinder;
A spring material installed outside the cylindrical main body,
Equipped with
The annular latch member is provided at an annular main body, a latch portion projecting from the annular main body in a direction horizontal to the central axis direction of the annular main body, an end of the latch portion, and a claw projecting to the inside of the annular main body Have a department,
The shield cylinder has a rear expanded cylinder portion capable of accommodating the latch portion of the annular latch member,
The shielding cylinder has a latch release portion which protrudes in the horizontal direction with the central axis direction of the cylindrical main body on the inner side of the shielding cylinder and on the side of the rear extended cylinder portion,
The annular latch member is fixed to the tubular body;
The cylindrical main body has a buttock,
When the claw portion of the annular latch member is hooked on the tip of the spring member, the spring material is compressed between the flange portion of the cylindrical main body portion and the claw portion of the annular latch member, and the front of the syringe body The injection needle installed in the unit is exposed from the shield cylinder,
When the shield cylinder is pulled toward the rear of the syringe body, the latch release portion of the shield cylinder spreads the claws of the annular latch member outward of the annular latch member, and the claws of the annular latch member The spring member is removed, the shield cylinder is moved in the direction to shield the injection needle by the repulsive force of the spring member, and the shield cylinder shields the injection needle installed at the front of the syringe body , Disposable self-shielding syringes. When the plunger rod of the syringe can move relative to the syringe body, the shield does not move relative to the annular latch member;
The syringe according to claim 1, wherein the shield cylinder can be pulled toward the rear of the syringe body after the plunger rod of the syringe abuts on the tip of the syringe body and can not move relative to the syringe body. Disposable self-shielded syringe. The cylindrical main body has a claw portion protruding to the outside of the cylindrical main body;
The shield cylinder has a first opening,
When the plunger rod of the syringe can move relative to the syringe body, the claw of the tubular body hooks on one end of the first opening of the shield cylinder, whereby the shield cylinder is the cylindrical body Do not move against
After the plunger rod of the syringe abuts on the tip of the syringe body and can not move, the other end of the first opening of the shield cylinder pushes down the claw portion of the cylinder body, whereby the shield cylinder is The disposable self-shielding syringe according to claim 2 or 3, which is movable relative to the tubular body. The shield cylinder has a second opening,
The claw portion of the cylindrical main body after the other end of the first opening of the shield cylinder pushes down the claw portion of the cylindrical main body, after the shield cylinder becomes movable with respect to the cylindrical main body. Hangs on the second opening of the shield cylinder, so that the shield cylinder does not move relative to the cylindrical body, and the shield cylinder shields the injection needle installed at the front of the syringe body The combined use syringe according to any one of claims 1 to 3. A combined container and syringe according to any of the preceding claims, wherein the shield cylinder comprises a finger grip.

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