JP2002028235A - Injection syringe cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a syringe cover which prevents the exposure of a needle cannula from the cover before injection and can make the pricking depth of the needle cannula into the skin constant in injection, and further to provide the syringe cover which is provided with plural injection mechanisms different in the pricking depth of the needle cannula into the skin and facilitates a change of the pricking depth. SOLUTION: The syringe cover consists of an outer sleeve, intermediate sleeve and inner sleeve which are mounted at the front end of a syringe coaxially with the syringe. The outer sleeve is mounted axially slidably by fitting a projection disposed on the outer side of the intermediate sleeve into a slit disposed in the axial direction of the syringe and the intermediate sleeve is slidably mounted by fitting the projection disposed on its inner side into a grove disposed on the outer side of the inner sleeve. A spring is disposed between the inner flange at the front end of the intermediate sleeve and an inner flange at the rear end of the inner sleeve. The sleeve for holding the syringe is coaxially disposed on the inner side of the inner sleeve across the inner flange at the rear end of the outer sleeve. The front end of the syringe is mounted at this sleeve, by which the fornt end of the needle cannula is held within the syringe cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle tube cover to be attached to a syringe. More specifically, the operability and safety of a syringe that can be carried by a patient at all times and injected when necessary can be improved. Parts.

[0002]

2. Description of the Related Art Injection is widely performed as a medical practice, and it is also common for patients themselves to inject diabetic insulin or the like subcutaneously (hereinafter referred to as self-injection). What is important in self-injection is that the needle tube is not exposed until the injection so as not to injure the patient, the depth of the needle tube piercing the skin is constant, and furthermore, the patient's pain when piercing the needle tube into the skin Is to be reduced as much as possible.

[0003] For example, the syringe disclosed in Japanese Patent Publication No. 7-63507 is a syringe capable of self-injection, in which a needle tube is housed in a tubular outer sleeve, and a forward and backward movement of the needle at the time of injection is performed by an inner side. It is regulated by stop means provided on the inner surface of the sleeve and the outer sleeve.

[0004]

According to the present invention, the needle tube is not exposed until the injection, the penetration depth of the needle into the skin at the time of injection is made constant, and the movement of the needle tube is performed smoothly. A syringe cover that can be provided. Further, it is an object of the present invention to provide a syringe cover in which a plurality of injection mechanisms are provided for one cover so that the movement of the injection needle, that is, the piercing depth of the needle tube can be easily changed.

[0005]

That is, the syringe cover of the present invention comprises an outer sleeve, an intermediate sleeve and an inner sleeve which are mounted coaxially with the syringe from the outside at the tip of the syringe. The outer sleeve is provided with an elongated slit in the axial direction of the syringe, a projection provided on the outer side of the intermediate sleeve is fitted into the slit, and the two sleeves are slidably attached to each other in the axial direction.
The intermediate sleeve has a protrusion provided on the inner side thereof fitted in a groove provided on the outer side of the inner sleeve, and is slidably mounted. In addition, a spring is provided between the front end inner flange of the intermediate sleeve and the rear end inner flange of the inner sleeve to maintain a force for opening the gap therebetween.
A syringe holding sleeve is provided coaxially inside the inner sleeve via a rear end inner flange of the outer sleeve,
The tip of the syringe is attached to the sleeve, and the tip of the needle tube is held inside the syringe cover.

When the distal end inner flange of the intermediate sleeve is pressed against the skin at the part to be injected at the time of injection, and the outer cylinder of the syringe is advanced, the outer sleeve and the inner sleeve driven by the inner flange advance together. With this movement, the outer and inner protrusions of the intermediate sleeve slide along the slit of the outer sleeve and the groove of the inner sleeve, respectively, and stop at the position where the inner protrusion reaches the rear end of the groove of the inner sleeve. Therefore, the needle tube is pierced from the surface of the skin to a certain depth, and when the plunger of the syringe is pressed, the injection solution is injected into the body. When the needle tube is removed from the skin after the injection operation is completed, the spring returns to its original shape with it,
This is a syringe cover configured so that the needle tube is housed inside the syringe cover without being exposed.

In the above-mentioned injection operation, a minute resistance is provided in the groove portion of the inner sleeve through which the inner protrusion of the intermediate sleeve passes just before the needle tube pierces the skin, so that the needle tube pierces the skin at the moment. A syringe cover configured to increase the speed of the syringe is also included in the present invention.

The groove provided on the outside of the inner sleeve of the syringe cover is substantially a parallelogram, or
A plurality of grooves having different depths for piercing the needle tube are provided on the outer surface of the inner sleeve, and a groove for sliding the inner protrusion of the intermediate sleeve is selected so that the piercing depth of the needle tube can be changed. It is. Furthermore, a short slit parallel to the slit of the outer sleeve is provided,
The present invention also includes a syringe cover in which the projection outside the intermediate sleeve is fitted into the slit when the syringe is not used so that the needle tube is not exposed even when the outer cylinder of the syringe is pushed.

Here, a spring is provided between the front end inner flange of the intermediate sleeve and the rear end inner flange of the inner sleeve, but the type of the spring is not particularly limited. A wide variety of elastic materials can be used. For example, a spiral spring, an air spring, a sponge, or the like can be used in addition to a plate spring.

One of the most important functions of the syringe cover of the present invention is to pierce the needle tube to a predetermined depth during injection. If the depth of the distal end of the needle tube is inappropriate, it may cause a medical obstacle. The depth to which the needle tube is pierced is a mechanism determined by the position of the tip of the groove of the inner sleeve in which the protrusion inside the intermediate sleeve is slidably fitted. The inner sleeve is held at the base of the syringe cover by the flange of the outer sleeve. In addition, the inner sleeve may rotate slightly with the injection operation, or the sleeve is rotatably held by the flange of the outer sleeve, so that the needle tube is not rotated during the injection operation. ing.

The needle tube of the syringe is always concealed by the syringe cover of the present invention before, during and after the injection operation, and also by the locking mechanism of the syringe cover. Is not exposed to the outside of the cover. Further, the syringe cover of the present invention is characterized in that the injection needle tube is configured to increase the speed of piercing the skin.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The syringe cover 9 of the present invention can use a commercially available syringe as it is, and does not require a special syringe as a self-injector. Less than,
The present invention will be described more specifically with reference to the drawings.

FIG. 1 is a cross-sectional view of one embodiment of the syringe cover of the present invention, taken along a plane passing through the axis of the syringe. The syringe cover of the present invention has a slit 2 provided in the outer sleeve 1.
In addition, a protrusion 4 provided on the outside of the intermediate sleeve 3 is fitted, and a protrusion 5 provided on the inside of the intermediate sleeve 3 is fitted on a groove 7 provided on the outside of the inner sleeve 6.

FIG. 2 shows a right side view of the inner sleeve 6.
The inner sleeve is provided with a cylindrical part 8 and a flange 9 at the rear. The front and rear surfaces of the sleeve each have a circular opening. FIG. 2 shows the outer surface of the cylindrical portion 8.
A groove 7 as shown in FIG. The groove is a structure that performs an important function of the present invention, and no syringe cover provided with such a structure is known. That is, the groove extends from the front to the rear of the cylindrical portion as shown in FIG.
The horizontally extending portion and the vertically elongated substantially parallelogram portion have a continuous shape.

The rear inner protrusion 5 of the intermediate sleeve 3 is fitted into the opening of the inner sleeve 6 at the entrance of the groove 7, and the protrusion 5 is slid along the groove. First, the protrusion 5 extends through a portion of the groove 7 that extends laterally from a short linear portion in the axial direction of the syringe.
When it reaches the parallelogram part, the action of the spring 12
The projection 5 automatically stops at the front end 17 of the parallelogram and is in a state before the start of the injection operation. At this time, the outer and inner protrusions 4 and 5 of the intermediate sleeve 3 slide along the slit 2 of the outer sleeve and the groove 7 of the inner sleeve, respectively.

As the projection 5 slides along the parallelogram groove of the inner sleeve, the movement of the inner sleeve 6 with respect to the intermediate sleeve 3 is restricted, and the movement of the inner sleeve 6 is controlled by the flange 15 of the inner sleeve 6 and the outer sleeve. Via the contact portion of the flange 13 of the sleeve 1, it is linked to the outer sleeve 1 and linked to the movement of the needle tube 16.

At the time of injection, when the outer cylinder of the syringe is advanced against the force of the spring 12, the protrusion 5 of the intermediate sleeve slides rearward along the axis from the front end 17 of the parallelogram of the groove 7. Accordingly, the inner sleeve moves forward with respect to the intermediate sleeve, so that the needle tube approaches the skin at the injection site of the patient from within the cover of the present invention. After the protrusion 5 slides rearward in the axial direction from the front end 17 of the parallelogram, the needle tube penetrates into the skin until it slightly displaces to the right rearward and reaches the rear end 18, and the protrusion 5 reaches the rear end 17. At this point, the penetration of the needle tube also stops. That is, the needle tube is kept pierced to a certain depth. At this time, the penetration depth of the needle tube is determined by the axial distance of the syringe from the front end 17 to the rear end 18 of the parallelogram.

In this state, the injection solution is injected into the body by operating the plunger. When the needle tube is removed after the injection, the protrusion 5 slides forward in the axial direction from the rear end 18 of the parallelogram, and then slightly displaces obliquely left forward to reach the front end 17. During this time, the syringe cover returns to the state before the injection by the force of returning to the original shape of the spring, so that the needle tube is not exposed during the injection operation and is stored inside the cover.

Here, it is more preferable to crimp the obtuse angle portion of the parallelogram of the groove 7 in order to smooth the operation in which the protrusion 5 is displaced rightward or leftward and slides. Further, the shape of the groove 7 is not limited to a parallelogram, and the stab depth of the needle tube can be made constant by sliding the protrusion 5, and the protrusion 5 returns to the position before the injection when the needle tube is removed. Any shape is acceptable. For example, the shape may be a combination of linear or arc shapes.

In the above-mentioned injection operation, while the projection 5 slides along the parallelogram of the groove 7, the projection 5
And at the stage just before reaching the rear end 18, it is slightly displaced rightward or leftward. This movement causes the inner sleeve to rotate slightly, but this sleeve is
The outer sleeve holding the syringe does not rotate because the inner sleeve rotates only slightly, so that the needle tube is not likely to rotate throughout the injection operation. . The inner sleeve 6
The flange 13 of the outer sleeve is provided with a narrow convex ridge 11 in order to reduce the friction when rotating.

Further, a minute convex portion 10 is provided below the upper left end of the parallelogram of the groove 7, so that a minute resistance can be given when the projection 5 passes through the groove. The projection 5 temporarily stops at the projection 10 and moves over the projection by applying further force, so that the projection 5 moves at a high speed for a short time. By such movement, the injection needle attached to the syringe cover of the present invention instantaneously pierces the skin, so that the pain at the time of piercing the largest needle tube can be greatly reduced. In addition, this mechanism can clearly confirm when the needle is pierced, so that anxiety can be eliminated and the operation can be concentrated, which is a great advantage in self-injection.

FIG. 3 is a side view showing one embodiment of the outer sleeve included in the syringe cover of the present invention. The outer sleeve 1 is a member that is fitted with the other two sleeves to integrally connect the cover, and a sleeve 19 for accommodating the distal end of the syringe is provided at the center thereof. In FIG. 3, the outer sleeve includes three cylindrical portions which are connected by a flange. The front and rear surfaces of the outer sleeve 1 are open.

A slit 2 provided in the axial direction is provided on the outer side of the outer sleeve 1, and a projection 4 provided on the outer side of the intermediate sleeve 3 is slidably fitted in the slit 2. Since the slit 2 and the projection 4 are for connecting the outer sleeve and the intermediate sleeve, at least one pair is required, but two or more may be provided. Two are provided.

It is preferable that a narrow protruding band 11 is provided on the surface where the outer sleeve 1 and the inner sleeve 6 are in contact at the lower end, so that the two sleeves slide smoothly. The projecting band 11 does not need to be provided completely continuously, and may have an intermittent shape. Instead of being provided on the front surface of the flange 13 of the outer sleeve 1, the projecting band 11 can be provided on the outer surface of the flange 15 of the inner sleeve 6.

A spring 12 is provided between the flange 14 at the front end of the intermediate sleeve 3 and the flange 15 inside the rear end of the inner sleeve 6. The spring holds a force acting to increase the distance between the two sleeves, and acts as a force for accommodating the injection needle in the cover or a force for removing the injection needle from the skin. In FIG. 1, a helical spring is used as the spring. However, any spring having appropriate elasticity can be used, and various linear springs, plate springs, air springs, plastic sponges, and the like can also be used.

Hereinafter, an embodiment using the syringe cover of the present invention will be described. The syringe is fixed by inserting the needle tube holding portion into a sleeve 19 for accommodating the distal end portion of the syringe provided on the outer sleeve 1. The syringe includes a needle tube portion and a drug solution storage cylinder, and there are a type in which the syringe is used integrally and a type in which the needle tube mounting portion and the cylinder are detachable. The cover of the present invention can be applied to any of them, and can be adapted to a special syringe by changing the structure of the sleeve 19 for storing the distal end portion of the syringe of the outer sleeve.

With the needle tube housed in the cover, the flange 14 of the intermediate sleeve 3, which is the tip of the syringe cover, is applied to the portion of the skin to be injected. The syringe barrel or cover outer sleeve is then depressed with a finger. If the tip of the needle tube is exposed too easily in this downward movement operation, an unexpected injury may be caused. Therefore, it is preferable to provide a lock mechanism on the syringe cover. As the locking mechanism, for example, a short slit parallel to the axial slit provided on the outer sleeve is provided, and if the outer projection 4 of the intermediate sleeve is fitted into the slit, the movement of the sleeve is locked. It is safe.

Another locking mechanism is to provide a resistance portion (not shown) such as a small projection at an appropriate position in the groove 7 on the outer surface of the inner sleeve from the front end to the rear end portion or the laterally extending portion of the outer surface. , The inner protrusion of the intermediate sleeve may be stopped at the resistance portion.

In the syringe cover of the present invention, the depth of penetration of the needle tube during movement of the needle tube can be regulated by the shape of the groove 7 of the inner sleeve. Therefore, a plurality of grooves having different penetration depths of the needle tube are provided on the outer surface of the inner sleeve. Depending on the type and the formulation of the injection, the groove can be selectively used to adapt to various uses. The syringe cover of the present invention can be used repeatedly by removing the needle tube holding portion of the syringe from the sleeve for storing the distal end portion of the syringe after use and replacing it with a new syringe, and replacing only the needle tube with a new one. Therefore, it is also possible to replace only the needle tube holder. Therefore, in combination with the function of selecting a plurality of grooves having different penetration depths of the needle tube, the syringe cover of the present invention can be used for a wide range of purposes.

The cover of the present invention is formed of a sterilizable metal or plastic. It is preferably formed of plastic in view of ease of molding and visualization of the movement of the protrusion of the intermediate sleeve and the groove of the inner sleeve.

[0031]

The syringe of the present invention is a cover for a syringe that can be carried by the patient at all times and can be injected when needed. By using this cover, the syringe can be held in a state where the needle tube is not exposed until the injection. In this case, the penetration depth of the needle tube into the skin can be made constant. Further, by providing grooves having a plurality of shapes in one cover, it is possible to easily change the penetration depth of the needle tube.
Further, the speed at the moment when the needle tube is pierced into the skin can be adjusted. It also has the function of reducing the patient's pain by piercing the needle tube into the patient's skin at a high speed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a plane passing through a central axis of one embodiment of a syringe cover of the present invention.

FIG. 2 shows a side view of one embodiment of the inner sleeve of the cover of the present invention.

FIG. 3 shows a side view of one embodiment of the outer sleeve of the cover of the present invention.

[Description of Signs] 1 Outer sleeve 2 Outer sleeve slit 3 Intermediate sleeve 4 Projection provided outside intermediate sleeve 5 Projection provided inside intermediate sleeve 6 Inner sleeve 7 Groove on inner sleeve outer surface 8 Inner sleeve cylinder Shaped part 9 Syringe cover 10 Convex part 11 Ridge band 12 Spring 13 Flange of outer sleeve 14 Flange of intermediate sleeve 15 Flange of inner sleeve 16 Needle tube 17 Front end of groove on outer surface of inner sleeve 18 Rear end of groove on outer surface of inner sleeve 19 Syringe tip Sleeve for storing part

Claims (5)

[Claims] The syringe cover comprises an outer sleeve, an intermediate sleeve and an inner sleeve mounted coaxially with the syringe at the distal end of the syringe. The outer sleeve has a slit provided in the axial direction of the syringe and an intermediate sleeve. The protrusion provided on the outside of the intermediate sleeve is fitted so as to be slidable in the axial direction, and the intermediate sleeve is fitted slidably by the protrusion provided on the inside thereof being fitted into the groove provided on the outside of the inner sleeve. A spring is provided between the intermediate sleeve front end inner flange and the inner sleeve rear end inner flange, and a syringe holding sleeve is provided coaxially inside the inner sleeve via the rear end inner flange of the outer sleeve; The tip of the syringe is attached to the sleeve so that the tip of the needle tube is held inside the syringe cover. When the syringe is advanced by applying the flange to the skin, the outer sleeve and the inner sleeve are advanced accordingly, and the outer and inner protrusions of the intermediate sleeve slide along the outer sleeve slit and the inner sleeve groove, respectively. Then, since the inner projection stops at the position where it reaches the rear end of the groove of the inner sleeve, the needle tube is pierced to a certain depth, and after the injection liquid is injected by pushing the plunger of the syringe, A syringe cover which is configured so that when the needle tube is removed, the spring returns to its original shape and is housed inside the syringe cover without exposing the needle tube. 2. Immediately before the needle tube penetrates the skin at the time of injection, a small resistance is provided in the groove of the inner sleeve through which the inner protrusion of the intermediate sleeve passes, thereby increasing the speed at which the needle tube penetrates the skin. The syringe cover according to claim 1, wherein the syringe cover is configured as follows. 3. The syringe cover according to claim 1, wherein the groove provided on the outside of the inner sleeve is substantially a parallelogram. 4. A plurality of grooves having different depths for piercing the needle tube are provided on the outer surface of the inner sleeve, and a groove for sliding the inner protrusion of the intermediate sleeve is selected so that the piercing depth of the needle tube can be changed. A syringe cover according to any one of claims 1 to 3, wherein the syringe cover is configured. 5. A structure in which a short slit parallel to the slit of the outer sleeve is provided, and a projection on the outer side of the intermediate sleeve is fitted into the slit so that the needle tube is not exposed even when the outer cylinder of the syringe is pushed. Item 5. A syringe cover according to any one of Items 1 to 4.