JP3090508B2 - Syringe with needle storage mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe having a mechanism capable of storing a needle inside the syringe after the injection. More specifically, the needle is stored inside the syringe by the action of a spring after the injection. At the same time, the injection hole is closed to prevent the patient's blood and the like adhering to the needle tip from leaking to the outside.

[0002]

2. Description of the Related Art At present, a great number of syringes are used mainly in the medical field. Recently, it has become a plastic disposable type.Before use, the injection needle has a plastic cap.
The fingertip is not directly touched by the finger. After use, the injection needle is again capped, or only the injection needle is removed and discarded. However, after removing the cap of the injection needle, the fingertip is often erroneously stabbed while the needle tip is exposed until the needle is recaptured and discarded. When the injected patient is a carrier of hepatitis virus or the like, the infection is transmitted. Therefore, the prevention measures have become a serious problem among clinical personnel.

[0003] In particular, cases of infection with AIDS have been reported in Western countries, giving serious anxiety. In the future, such a situation is worried in Japan as well.

[0004] Considering the course of infection with viruses and the like, there is no risk of infection before use of the syringe, even if the injection needle is accidentally stabbed at the fingertip but only injuries. After using the syringe, there is a problem until the syringe is discarded in the processing container. After use, if the injection needle can be stored inside the syringe by an operation that does not cause the injection needle to stick to the fingertip, infection can be prevented. Furthermore, considering that the final processing is completed after many manual operations even after the medical personnel throws it away in the processing container, the injection needle is stored inside the syringe, and at the same time, the mounting hole for the injection needle at the tip of the syringe is inserted. It is necessary to close the needle so that the blood and the like of the patient adhering to the needle tip do not leak outside.

[0005] The mechanism for removing the injection needle from the interior of the syringe only during use or for storing the injection needle in the interior of the syringe after use becomes considerably complicated. Therefore, such a mechanism is added to a conventional disposable type syringe. Few attempts have been made to do so.

[0006] As a few disclosure examples, PCT / EP89 / 01408
A mechanism is shown in which a plastic syringe is combined with about 10 complicatedly shaped plastic molded parts, and a mechanism for moving a syringe needle in and out by utilizing the force of a spring. This is because when using the needle that was stored inside the syringe before use, the syringe needle pops out from the tip of the syringe and is automatically attached by pushing in the needle (cucumber) of the syringe and sucks the injection solution. After the patient is injected, the lock is released and the needle is stored inside the syringe by the force of the spring when the suction rod is further pushed in. Further, the injection needle once stored after use is prevented from coming out again even if the suction needle is pushed in.

However, a problem with this mechanism is that the injection needle is bent in advance, deformed and straightened at the time of assembly, and when the injection needle is retracted after use, the injection needle returns to its original shape. , It is structured not to go out even if pushed. However, since the degree of deformation cannot be increased due to the structure, there is a danger that the injection needle easily comes out to the outside when the component fixing the injection needle moves slightly. Further, it is difficult to completely seal the mechanism portion, and the injection solution may enter the portion. Furthermore, the number of parts is large, the shape is complicated, and there are many parts that require delicate preparation during assembly.

In this mechanism, the injection needle is stored inside the syringe even before use, but since infection such as virus cannot occur before use, it is not necessary to add a very complicated mechanism. It is thought that there is no.

[0009]

SUMMARY OF THE INVENTION The present invention is a simple mechanism, which stores the injection needle safely inside the syringe after the injection is completed, and closes the needle hole at the tip of the syringe so that the injection needle is erroneously moved to the outside. It is an object of the present invention to provide a syringe that does not leak out and that does not leak patient's blood or the like adhering to the needle tip to the outside.

[0010]

According to the present invention, when handling a syringe, an injection needle accidentally sticks to a fingertip and causes an accident such as virus infection only after the injection is completed and before the syringe is discarded into a processing container. Focusing on the idea of using a spring, the idea of a mechanism that closes the mounting hole of the syringe needle at the tip of the syringe at the same time that the injection needle is safely stored inside the syringe after the end of the injection with a simple mechanism by using a simple mechanism. Based on this, the present invention has been achieved.

That is, the outer cylinder 1, the suction tube 2, the needle tube 3, the needle tube holding plug 4, the needle hole closing plug 5, the spring 6 connecting the needle tube holding plug and the needle hole closing plug of the syringe, and the outer tube and the needle tube It consists of a lock mechanism between the holding plugs, and the needle tube holding plug is fixed in the outer cylinder by the locking mechanism until the end of the injection, but when the suction tube is further pushed in after the injection, the lock holding the needle tube holding plug is fixed. Is released, the needle tube holding plug is pushed in, and then the force for holding the sucker is loosened, the spring pushes the needle tube holding plug up, and the needle tube is stored inside the outer cylinder,
A syringe with a needle storage mechanism and / or the outer cylinder 1 is provided with a portion 27 having an inner diameter that is changed by closing the needle hole at the tip of the outer cylinder by moving the needle hole closing plug by a spring. The inner diameter of the rear part is larger than the front part, and when the needle tube holding plug is pushed up to the rear part of the syringe by the spring, the inner diameter of the rear part of the outer cylinder is large, so a gap is created between the needle tube holding plug and the inner surface of the outer cylinder, reducing frictional resistance A syringe with an injection needle storage mechanism. Further, the present invention relates to a specific mechanism for locking the needle tube holding plug and closing the needle hole.

In the first, second, third and fourth aspects of the present invention, the operation of pushing up or pushing down the needle tube holding plug or the like is performed in an upward direction (rear portion of the syringe) or a downward direction in the syringe shown in FIG. (In front of the syringe). Hereinafter, the present invention will be described in detail.

Considering not only infections such as hepatitis virus, but also fingertip injuries as a safety measure in handling the injection needle, the injection needle is stored inside the syringe before use, and one-touch injection at the time of use. Ideally, a needle is attached, and it can be stored inside again with one touch so that blood or the like of the patient adhered to the needle tip after use does not leak outside. However, it is inevitable that a considerably complicated mechanism is required for this. Considering the degree of injury, a mere stab wound on a fingertip is extremely minor as compared to infection with virus or the like. Therefore, even if the needle is not retracted before use, the needle can be safely stored after use, and the injection needle does not come out again even if a strong force is applied. If blood can be prevented from leaking to the outside, infection can be prevented. Therefore, if only this operation is targeted, the mechanism should be greatly simplified.

In view of the above, the present invention provides a needle tube holding stopper movable inside the syringe and a locking and unlocking mechanism therefor, and utilizes the force of a spring connecting the needle tube holding stopper and the needle hole closing stopper. The mechanism is greatly simplified by storing the injection needle and closing the needle hole.

Next, the present invention will be specifically described with reference to the drawings. 1, 2 and 3 are cross-sectional views of one embodiment of the syringe of the present invention. FIG. 1 shows a state before use, FIG. 2 shows a state in which an injection solution 29 is sucked into an outer cylinder, and FIG. It shows a state in which the hands are stored. The outer cylinder 1 and the suction tube 2 of the syringe can be widely used as long as they are transparent and do not contain components eluted in the injection solution, similarly to commonly used syringes. Usually, plastic or glass is used. Glass is more chemically stable than plastic, but is difficult and expensive to process into complex shapes, while plastic is easy and inexpensive to mold into complex shapes.
For this reason, recent disposable syringes are almost made of plastic, and the tip of the suction tip is covered with synthetic rubber, natural rubber, or plastic having high elasticity, and a highly airtight structure is often used.

The syringe of the present invention needs to be provided with a mechanism for accommodating the injection needle inside. Therefore, it is preferably made of plastic which is easy to process, and has a highly airtight structure in which the tip of the sucker is covered with rubber or the like. preferable. The inner surface of the outer cylinder is provided with a concave portion 8 as a part of a lock mechanism for fixing the position of the needle tube holding plug 4, and a stopper 26 for preventing the sucker from falling off.

Since the needle tube 3 is provided with a mechanism for accommodating the injection needle inside the syringe, the same tube as the ordinary needle tube can be used except that it is longer than the ordinary needle tube by 10 to 15 mm.

The needle tube holding plug 4 has a function of holding the needle tube, a function of locking to the outer cylinder, and a function of holding one end of the spring 6. For this reason, the material is not particularly limited because it has a complicated shape, but a plastic molded product is preferable. FIG. 4 shows an enlarged cross-sectional view of one embodiment of the present invention.
It is injected through the interior of a 12-needle tube.

The protrusion 9 of the needle tube holding plug and the concave portion 8 of the outer tube are provided at two places on the circumference of the needle tube holding plug and the outer tube as shown in FIG. Is provided. The projection 9 is engaged with the concave portion 8 of the outer cylinder, and the position of the holding plug is fixed by the spring 6 connected to the spring receiving portion 16 in FIG.

When the needle tube holding plug 4 is pushed down, the projection 9 comes into contact with the lower end 14 of the concave portion 8 of the outer cylinder and is deformed, moves to the position 15 and disengages. Needle tube holding stopper and outer cylinder cam 1
0 and 11 are sectional views taken along the line BB 'in FIG. 4, and as shown in FIG.
It is provided in two places on the circumference. FIG. 6A is a perspective view of a meshing portion of the cam. When the holding stopper is lowered, the cams 10 and 11 come into contact with each other, and the tip 17 of the cam 11 obliquely descends along the slope of 10 as shown in FIG. 6 (b) → (c) → (d), and as shown in FIG. Stop in position, during which the needle retaining plug is 18-19
It rotates by the circumference up to. Therefore, when the force for pressing the needle tube holding plug is loosened and the needle tube holding plug is pushed up by the action of the spring 6, the projection 9 does not mesh with the concave portion 8 and is pushed upward until the spring is restored.

The above shows one mode of the lock mechanism. The needle tube holding plug 4 is fixed at a fixed position until the injection is completed. When the pressing force is reduced, the needle tube holding plug is pushed upward by the spring, but any mechanism may be employed as long as it is not locked again at that time.

If necessary, a packing 23 can be attached along the circumference of the needle tube holding plug 4. This increases the airtightness of the contact portion between the needle tube holding plug and the inner surface of the outer cylinder,
Leakage of the injection solution between the needle tube holding plug and the tip of the outer cylinder can be completely prevented.

FIGS. 7A and 7B show the state of the needle tip and the needle hole stopper before and after use. The needle hole stopper 5 is provided with a spring receiving portion 20 and a small hole 7, and the spring 6 is connected to the spring receiving portion 20. Because of this, the shape is complicated, and the material is not particularly limited.
Plastic molded articles are preferred. While the needle tube 3 is initially held through the small hole 7 of the needle hole stopper 5, the injection needle is pushed up and comes out of the small hole.
The action of pushing down the needle hole stopper plug of the spring works, and the stopper stopper is pushed down from the position of 5 and rotates to be in the state of 21, so that the needle hole 22 is closed. Furthermore, the stopper is fixed in the state of 21 by the action of the spring.

FIGS. 8 (a) and 8 (b) show the state before and after use of the needle hole stopper in another embodiment.
The closure plug changes from the state 24 before the closure to the state 25 after the closure. When the needle hole stopper is formed in such a shape, the needle hole can be more completely closed as can be seen from the relationship between the stopper plug 25 and the needle hole 22.

In addition, the needle hole closing plug may be of any shape as long as the needle hole can be closed when the injection needle is pulled out from the small hole.

Further, according to the present invention, as shown in FIG. 9, a portion 27 whose inner diameter changes is provided on the inner surface of the outer cylinder 1 so that the inner diameter of the rear part is larger than that of the front part of the outer cylinder. FIG. 9 is a sectional view of a syringe having the above-described embodiment of the present invention.
(a) shows the state where the injection needle is retracted before use and at the end of injection, and (b) shows the state where the injection needle is stored after use. In FIG. 9, a portion 27 where the inner diameter of the outer cylinder changes is provided at a portion where the upper end of the needle tube holding plug 4 contacts the inner surface of the outer cylinder, and the inner diameter of the lower portion, that is, the rear portion is larger than the front portion of the syringe. Accordingly, the distal end 28 of the sucker 2 comes into contact with the outer cylinder at a portion where the inner diameter of the outer cylinder is large, and airtightness is maintained. The needle tube holding plug 4 is airtightly maintained at the packing 23. The small part is in contact with the outer cylinder.

When the suction tube 2 is further pushed in after the injection is completed, the lock which fixed the needle tube holding plug 4 is released, and the needle tube holding plug is pushed in.
The needle tube holding plug is pushed up by the spring 6. At this time, the spring needs to push up the needle tube holding plug packing 23 against the frictional resistance generated between the inner surface of the outer cylinder and between the tip 28 of the sucker 2 and the inner surface of the outer cylinder. However, if the inner diameter of the rear part is made larger than that of the front part of the outer cylinder by providing a portion 27 whose inner diameter changes on the inner surface of the outer cylinder, the frictional resistance generated between the tip 28 of the sucker and the inner surface of the outer cylinder is increased However, the frictional resistance generated between the packing 23 of the needle tube holding plug and the inner surface of the outer cylinder is greatly reduced.

FIG. 10 shows the details of the contact state between the needle tube holding plug 4 and the inner surface of the outer cylinder. The needle tube holding plug comes into contact with a portion of the packing 23 where the inner diameter of the outer cylinder is small, so that airtightness is maintained.
When the needle tube holding plug is pushed up by the spring 6,
Until the packing reaches the inner surface 27 of the outer cylinder, frictional resistance is generated between the packing and the inner surface of the outer cylinder. Gaps occur and little friction occurs. Therefore, the frictional resistance generated when pushing up the needle tube holding plug and the sucker is greatly reduced. The state is shown in FIG.
The difference in the inner diameter of the inner surface 27 of the outer cylinder 1 is not particularly limited, but is preferably about 1 mm in a usual syringe.

The frictional resistance generated at that time depends on the packing 23
For the first few moments before the outer cylinder inner surface 27 is reached, the sum of the frictional resistance generated between the packing 23 and the tip 28 of the sucker and the inner surface of the outer cylinder is equal. For most of the period after passing through the portion, the resistance generated between the packing and the inner surface of the outer cylinder almost disappears, and only the frictional resistance generated between the tip 28 of the sucker and the inner surface of the outer cylinder is reduced. Therefore, it is greatly reduced.

After the injection is completed, when the sucker 2 is further pushed in to release the lock that fixed the needle tube holding plug 4, the spring is in the most compressed state. Therefore, the spring exerts the greatest repulsion at the moment when the force for holding down the sucker is released and the spring starts to push up the needle tube holding plug and the sucker. At this time, the frictional resistance applied to the spring is the largest, and as described above, the resistance is greatly reduced thereafter, and the repulsive force of the spring is also gradually reduced, so that the spring force can be more effectively used. Therefore, compared to a syringe that does not have a portion 27 whose inner diameter changes on the inner surface of the outer cylinder,
Even small springs can function satisfactorily.

If the spring is small, the structural strength of the whole syringe can be reduced, and there are many advantages such as a thin wall of the syringe. Further, as can be seen from FIG. 10, it is preferable that the distance between the packing 23 and the portion 27 where the inner diameter of the outer cylinder changes is made as short as possible to reduce the frictional resistance when pushing up.

[0032]

Before use, the syringe of the present invention is fixed at a fixed position in the outer cylinder with the needle tube holding plug 4 locked, and the needle tip is usually covered with a plastic protective cap.
When using a syringe, remove the needle tip cap after sterilization,
The sucker 2 is moved to draw the injection solution 29 into the syringe.
At this time, since the needle tube holding stopper is locked inside the outer cylinder, the injection solution enters between the holding stopper and the tip of the sucker. Further, since the contact portion between the needle tube holding plug and the inner surface of the outer cylinder is kept airtight, the injection solution does not leak and enter between the holding plug and the needle hole closing plug.

After the injection is completed, if the suction tube is further pushed in until it stops, the needle tube holding plug 4 is also pushed down to release the lock. Next, when the force for holding down the suction tube is loosened, the needle tube holding plug is pushed up by the action of the spring. . At this time, since the needle tube holding plug is not locked again in the previously locked position, the needle tube holding plug is pushed up to the position where the spring is restored, and the needle tube connected thereto is also the outer cylinder. 1
Is stored inside.

Since the needle tube is pushed up inside the outer cylinder,
When the needle tube comes out of the small hole 7 of the needle hole stopper 5, the force of the spring pressing down the needle hole stopper acts to move the needle hole stopper 5 to the position 21 to close the needle hole 22.

According to the relationship between the used needle tip and the needle hole closing plug shown in FIG. 3, even after the needle is once stored, even if the sucker is pressed down with a strong force, the needle hole closing plug closes the needle hole. There is no risk that the injection needle will go out because it is closed.

Further, a portion whose inner diameter changes is provided on the inner surface of the outer cylinder, so that the inner diameter of the rear portion is larger than that of the front portion of the outer cylinder. After the injection is completed, the suction tube is further pushed in, and when the lock that has fixed the needle tube holding plug is released, the spring is in the most compressed state. The moment the spring begins to push up, the spring exerts its greatest rebound. At this time, the frictional resistance applied to the spring is the largest, and as described above, the resistance is greatly reduced thereafter, and the repulsive force of the spring is also gradually reduced, so that the force of the spring matches the frictional resistance, and the force is more effectively reduced. Can be used for Therefore, compared to a syringe in which the portion 27 of which the inner diameter changes on the inner surface of the outer cylinder, even a small spring can function sufficiently.

Further, since a small amount of silicon is usually used in a syringe, this mechanism can be operated extremely smoothly.

[0038]

According to the present invention, there is provided a syringe capable of safely storing a syringe needle after use of the syringe with a simple mechanism for preventing infection of hepatitis virus or the like. Further, once the needle is stored inside, it does not go out no matter how it is handled, and the needle hole at the tip is closed, so that the patient's blood or the like adhering to the needle tip can go out. There is no leakage. Further, the used syringe has a structure that cannot be reused.

Therefore, the use of this syringe has a remarkable effect in preventing infection of viruses and the like, and is also effective in preventing infection of AIDS, which has recently become a problem in countries around the world.

[Brief description of the drawings]

FIG. 1 shows the use of one embodiment of the syringe with a needle storage mechanism of the present invention .
FIG. 3 shows a sectional view in a state before use.

FIG. 2 is a diagram showing an example of the injection of the injection liquid into the outer cylinder of the syringe shown in FIG .
FIG. 4 shows a cross-sectional view of the inserted state.

FIG. 3 shows that after using the syringe shown in FIG .
FIG. 3 shows a cross-sectional view of a state in which it is stored inside.

FIG. 4 shows an embodiment of a syringe with a needle needle storage mechanism according to the present invention .
FIG. 2 is an enlarged cross-sectional view of a needle tube holding plug and a lock mechanism that can be used.

5 (a) and (b) show the needle tube holding stopper and the lock shown in FIG.
FIG. 2 is an enlarged cross-sectional view taken along AA 'and BB' of the locking mechanism.
You.

FIG. 6A is a perspective view of an engagement portion of a cam according to one embodiment of the present invention, and FIGS. 6B, 6C, and 6D show the operation states of the cam in chronological order. It is.

FIG. 7 is an enlarged cross-sectional view of a needle tip portion according to one embodiment of the present invention,
(A) shows the state before use until the end of injection, and (b) shows the state after use.

FIG. 8 is an enlarged cross-sectional view of a needle tip portion according to one embodiment of the present invention,
(A) shows the state before use until the end of injection, and (b) shows the state after use.

9A and 9B are cross-sectional views of one embodiment of the syringe with a needle storing mechanism of the present invention, in which FIG. 9A shows a state in which the injection needle is stored before use and at the end of injection, and FIG. .

FIG. 10 is an enlarged cross-sectional view of a needle tube holding plug and a lock mechanism according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder of a syringe 2 Suction tube of a syringe 3 Needle tube 4 Needle tube holding plug 5 Needle hole closing plug 6 Spring 7 Small hole provided in a needle hole closing plug 8 Recess of outer cylinder 9 Projection of needle tube holding plug (locked state) Reference Signs List 10 Cam (outer tube) 11 Cam (needle tube holding plug) 12 Needle tube holding portion of needle tube holding plug 13 Injection needle inlet I4 End of concave portion 8 of outer tube 15 Position of projection of needle tube holding plug (unlocked state) 16 Needle tube holding plug spring attachment portion 17 Cam operating portion (needle tube holding plug) 18 Cam operating portion operating start position (outer cylinder) 19 Cam operating portion operating end position (outer cylinder) 20 Needle hole closing plug spring Attachment part 21 Operation end position of needle hole closing plug 22 Needle hole 23 Packing 24 Needle hole closing plug (another mode) 25 Operation end position of needle hole closing plug (another mode) 26 Stopper 27 Inner diameter of outer cylinder Strange Tip portion 29 Injection portion 28 吸子 to

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61M 5/32

Claims (4)

(57) [Claims] 1. An outer cylinder 1, a needle 2, a needle tube 3, a needle tube holding plug 4, a needle hole closing plug 5, a spring 6 connecting the needle tube holding plug and the needle hole closing plug, and the outer tube and the needle tube of the syringe. It consists of a lock mechanism between the holding plugs, and the needle tube holding plug is fixed in the outer cylinder by the locking mechanism until the end of the injection, but when the suction tube is further pushed in after the injection, the lock holding the needle tube holding plug is fixed. The needle tube holding plug is pushed in and the needle tube holding plug is pushed in.Then, when the force for holding down the sucker is loosened, the needle tube holding plug is pushed up by the spring, the injection needle is stored inside the outer cylinder, and the needle hole closing plug is pressed by the spring. A syringe with an injection needle storage mechanism, which moves to close a needle hole at the tip of an outer cylinder. 2. An outer cylinder 1, a needle 2, a needle tube 3, a needle tube holding plug 4, a needle hole closing plug 5, a spring 6 connecting the needle tube holding plug and the needle hole closing plug of the syringe, and the outer tube and the needle tube. It consists of a lock mechanism between the holding plugs, and the outer cylinder 1 has a portion where the inner diameter changes.
The inner diameter of the rear part is larger than that of the front part of the outer cylinder, and the needle tube holding plug is fixed in the outer tube by a lock mechanism until the end of the injection. When the fixed lock is released and the needle tube holding plug is pushed in, and then the force for holding down the sucker is loosened, the needle tube holding plug is pushed up by the spring, the injection needle is stored inside the outer cylinder, and the spring The needle hole stopper plug moves and the needle hole at the tip of the outer cylinder is closed, but when the needle tube holding plug is pushed up, a large gap is created between the needle tube holding plug and the inner surface of the outer cylinder because the inner diameter of the rear part of the outer cylinder is large. A syringe with an injection needle storage mechanism, characterized in that resistance is reduced. 3. A small hole 7 is provided in the needle hole closing plug, and the injection needle is held through the small hole until the end of the injection. However, the lock is released, the holding plug is pushed up, and the injection needle is closed. 3. The syringe with a needle-needle storing mechanism according to claim 1, wherein the needle-hole closing stopper is moved by a spring to close the needle-hole when disengaged from the needle. 4. A locking mechanism comprising a concave portion 8 provided on the inner surface of an outer cylinder of the syringe and a projection 9 provided on a portion of the needle tube holding plug which is in contact with the inner surface of the outer tube. The projection is engaged with the concave portion of the outer cylinder to fix the needle tube holding plug, but if the suction tube is further pressed down after the injection, the projection fixing the needle tube holding plug is pushed down to disengage the needle tube holding. 2. A mechanism in which the stopper is twisted by the action of the cams 10 and 11, and is not locked again when the needle tube holding stopper is pushed upward by the action of the spring.
3. The syringe with a needle storage mechanism according to claim 2. [0001]