JP2901483B2 - Syringe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe (here, the term "syringe" refers to a general concept of a syringe which includes not only a general syringe but also a so-called prefilled syringe which is also used as a container). In particular, the present invention relates to an improvement of a “needleless lock-type syringe” described later.

[0002]

2. Description of the Related Art In a syringe, a method of attaching an injection needle to a nozzle is performed by using a taper portion of a male side (nozzle side) and a female side (a needle base side of the injection needle). The type to be press-fitted, and both the nozzle and the needle base have a pair of male and female taper fitting shapes, and further have a cylindrical screw part outside and a helical screw part inside the cylinder tip nozzle In addition, a flange is provided at the base of the injection needle, and the flange is screwed into a threaded portion on the inner peripheral surface of the collar portion. And a type provided with a structure that ensures the fitting of both the injection needle and the nozzle. In particular,
The latter is generally called a lock-type syringe because the injection needle is securely stopped by the nozzle by screw fitting.

[0003] On the other hand, a syringe is a so-called "needle with a needle" in which an injection needle is previously attached to the tip of an outer cylinder, and an injection needle so that the size of the injection needle can be appropriately selected at the time of injection. Is divided into so-called "needle-less syringes" which are commercialized in a form in which they are not attached.

[0004] In today's advanced medical practice, syringes are sterilized and commercialized, and disposable sterile syringes that can be opened and used immediately at the time of use are common, including a nozzle and a needle at the time of injection. The lock-type syringe is selected when high pressure is applied to the fitting portion or when the syringe must not be loosened or fall off from the nozzle, and, depending on the type of the medicinal solution to be injected, an appropriate injection needle for the nozzle. When it is necessary to select a size and mount it, a "needle-free lock type syringe" is preferably used. The present invention
Such a conventional sterilized “needleless lock syringe”
It is related to the improvement of.

[0005] Normally, in the above-mentioned sterilized "needle-free lock type syringe", in order to maintain a nozzle to which no injection needle is attached in a sterile state until immediately before the injection needle is attached, as shown in FIG. The nozzle 3 of the tip 2 of the outer cylinder 1 is previously covered with the cap 4 and sterilized in this state.

[0006]

However, the conventional sterilized "needleless lock type syringe" has the following problems. That is, as shown in FIG. 10, in the conventional syringe, the height La (height from the cylinder base) of the collar portion 5 provided outside the nozzle 3 for fixing the injection needle is the nozzle La. 3 is set lower than the height Lb. For this reason, in use, first, after removing the cap 4, the tip of the nozzle 3 is exposed until the injection needle 7 shown in FIG. 9 is attached to the nozzle 3. But this bare nozzle 3
There is a danger that the nozzle 3 may lose its sterility due to contact with the tip of the nozzle 3. As a result, in some cases, the chemical solution is contaminated by bacteria and the like when passing through the connection between the nozzle 3 and the needle base 8 and is directly injected into the body, which may cause a serious medical accident. .

[0007] In particular, in the case of injection into the joint cavity or spinal cord, contact contamination to the nozzle 3 is strictly prohibited because bacterial contamination easily causes serious medical accidents. If you become aware of the possibility in advance,
Carefully disinfect and wipe with alcohol wool, etc.If it is difficult to sterilize with alcohol wool, etc. due to the shape and size of the nozzle,
The current situation is that the product is not used, and a new syringe is opened and used again, and careful measures are taken to prevent bacteria and the like from contaminating the nozzle.

[0008] As described above, the conventional sterilized "needle-free lock type syringe" can maintain the sterility in the product state,
Due to its structure, it is not feasible to maintain sterility between the time of removing the cap 4 and the time of attaching the injection needle 7 during use.

[0009] The present invention has been made in view of the above circumstances, and while maintaining the advantages of a sterilized needleless lock type,
It is an object of the present invention to provide a syringe that eliminates the risk of contact contamination of the nozzle portion between the time the cap is removed and the time the syringe needle is attached, which was inevitable in the conventional structure, and eliminates the risk of bacterial contamination. I do.

[0010]

According to a first aspect of the present invention, there is provided an outer cylinder having a tube tip at one end and a finger grip at the other end, and a long tube inside the outer cylinder. An inner cylinder that is slidably fitted in the direction of the outer cylinder, a nozzle is provided at the tip of the outer cylinder, and a collar portion that is arranged concentrically with the nozzle outside the nozzle is provided. In the syringe in which the needle base of the injection needle is fixed to the nozzle by screwing the needle base flange of the injection needle to the screw part formed on the inner peripheral part of the part, the outer periphery of the collar part is cylindrical. A color ring is fitted, and the distal end of the color ring is configured to have a height equal to or higher than the distal end of the nozzle.

According to a second aspect of the present invention, in the syringe according to the first aspect, a part of the cylindrical collar ring fitted to the outer periphery of the collar part, which protrudes above the collar part. The peripheral surface is formed with a cap fixing screw portion to which a nozzle protection cap is screwed.

According to the third aspect of the present invention, an outer cylinder having a cylinder tip at one end and a finger grip at the other end,
An inner cylinder slidably fitted along the length direction inside the outer cylinder, and a nozzle disposed at the tip of the outer cylinder and a collar disposed concentrically with the nozzle outside the nozzle. Part is provided, and the needle base of the injection needle is fixed to the nozzle by screwing the needle base flange of the injection needle to a screw part formed on the inner peripheral part of the collar part. The distal end of the collar portion projects at a height equal to or higher than the distal end of the nozzle, and further, the inner peripheral portion of the collar portion further includes a nozzle at the distal end side of the thread portion for fixing the needle and flange. The configuration is such that a cap fixing screw portion to which the protective cap is screwed is formed.

According to a fourth aspect of the present invention, in the syringe according to the third aspect, the cap for protecting the nozzle is attached to the collar portion by a concave-convex fit instead of screwing, and the cap is secured when the cap is fixed. Is formed so as to abut on the tip of the collar portion.

According to a fifth aspect of the present invention, in the syringe according to the third aspect, the cap includes a projection, a flange, and a cap main body from the base end toward the tip. The screwing of the projection into the collar portion is stopped by abutting on the tip of the collar portion.

[0015]

According to the present invention, by providing a color ring made of a separate member on the outer periphery of the collar portion, or by directly increasing the height of the collar portion, the height of the collar portion or the tip of the color ring is set to the inner nozzle. Since the nozzle is set to the same level or higher than the tip, in other words, the nozzle is protected by an outer collar, etc. Prevent hand or clothing from contacting the nozzle tip. Therefore, the sterility of the nozzle can be easily maintained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIGS. 1 to 3 show a syringe according to a first embodiment of the present invention. This syringe has an outer cylinder 10 having a cylinder tip 11 at one end and a finger grip at the other end.
And an inner cylinder fitted inside the outer cylinder 10 so as to be slidable along the length direction. FIG. 1 shows only one end of the outer cylinder 10 and omits the other end of the outer cylinder 10 and the inner cylinder. A nozzle tip 12 of the outer cylinder 10 is provided with a nozzle 12 and a collar 13 disposed concentrically with the nozzle 12 outside the nozzle 12. A screw portion 13a is formed on an inner peripheral portion of the collar portion 13. A flange 8a formed on the needle base 8 of the injection needle 7 shown in FIG. 9 is screw-fitted to the screw portion 13a, whereby the needle base 8 of the injection needle 7 is fitted and fixed to the nozzle 12. The needle base 8 and the nozzle 12 of the injection needle 7 are respectively provided with corresponding tapered portions, and the tapered fitting of this portion is the same as that of the conventional one. Further, the cap 14 for holding the nozzle 12 in an aseptic state is attached to the cylinder tip 11 by screwing the flange 14a formed at the base end thereof into the threaded portion 13a on the inner peripheral surface of the collar portion 13. It is the same as the conventional one.

A cylindrical color ring 16 is attached to the outer periphery of the collar portion 13. Color ring 16
Is set to a size close to the outer diameter of the collar portion 13. A ring groove 17 is formed on the proximal end of the inner peripheral portion of the collar ring 16, and a ring-shaped convex portion 18 is formed on the proximal end of the outer peripheral portion of the collar portion 13 so as to correspond to the ring groove 17. Have been. Ring-shaped convex portion 18 and ring groove 1
In the state where the collar ring 7 is fitted, the coloring 1
The tip of the collar 6 projects outward beyond the tip of the collar 13, and the tip of the color ring 16 is
Projecting outward at a height equal to or even higher than the tip of the.

An appropriate number of vertical ribs 19 are provided on the outer peripheral surface of the collar portion 13, and the same number of vertical grooves as the vertical ribs 19 are provided on a portion of the inner peripheral surface of the color ring 16 overlapping the collar portion 13. 20 are formed. And these vertical ribs 1
The collar 9 and the vertical groove 20 are fitted to each other, so that the color ring 16 does not rotate unnecessarily with respect to the collar portion 13. In addition, on the outer periphery of the cap 14,
Considering the convenience of attachment and detachment, a vertical rib 21 for a knob may be provided as shown in the drawing as necessary. Further, as shown in FIG. 3, an extremely fine spiral concave portion 22 may be provided on the nozzle contact surface inside the cap 14 so as to ensure the sterilization and maintain the sterility thereafter. These caps 14
The provision of the vertical rib 21 and the provision of the spiral concave portion 22 are the same in the following second to sixth embodiments.

In order to perform injection using the sterilized syringe having the above-described structure, the cap 14 is rotated in the direction opposite to the tightening direction so that the screw portion 13 on the inner peripheral surface of the collar portion 13 is rotated.
a, and then select an injection needle 7 of an appropriate size as shown in FIG. 9 and use the flange 8a of the needle base 8 provided on the injection needle 7 to form a screw portion 13a on the inner periphery of the collar portion 13.
Screw the flange 8a. This enables injection using the syringe.

In the preparatory stage before the injection, the height of the tip of the collar portion 13 is set to be substantially the same as or higher than the tip of the nozzle 12, so that after removing the cap 14 for protecting the nozzle, the injection needle is removed. It is possible to prevent the operator's hand or clothes from coming into contact with the tip of the nozzle 12 even before the attachment of the nozzle 7. Therefore, the sterility of the nozzle 12 can be easily maintained.

The color ring 16 has a vertical groove 20 on its inner periphery.
The vertical groove 20 is provided on the outer peripheral rib 1 of the collar portion 13.
9, the relative rotation of the color ring 16 with respect to the collar portion 13 is regulated.
The handling of the color ring 16 and the outer cylinder 10 integrated therewith becomes easy.

In the above embodiment, the coloring 16
When attaching to the collar portion 13, a ring groove 17 is provided on the collar ring 16 side and a ring-shaped convex portion 18 is provided on the collar portion 13 side, and the ring groove 17 and the ring-shaped convex portion 18 are fitted to each other. However, the present invention is not limited to this, and conversely, a ring-shaped convex portion may be provided on the color ring 16 side, and a ring groove may be provided on the collar portion 13 side. Further, instead of the ring-shaped convex portion 18, a dotted chain-shaped convex portion may be used. In this case, the ring groove 17 may be used as it is, or may be replaced with a dotted chain concave portion.

<Second Embodiment> FIG. 4 shows a syringe according to a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description will be simplified. The feature of this syringe is that a cap fixing screw portion is provided on an inner peripheral surface of a projection 16a of the cylindrical collar ring 16 fitted to the outer periphery of the collar portion 13 projecting upward from the collar portion 13. 31 is provided, and a flange 35 of a nozzle protection cap 33 is screwed into the screw portion 31.

In this case, a vertical rib 19 is provided on the outer peripheral surface of the collar portion 13, while a vertical groove 20 is provided on the inner peripheral surface of the color ring 16, so that the vertical rib 19 and the vertical groove 20 are mutually separated. The fitting prevents the collar ring 16 from rotating unnecessarily with respect to the collar portion 13 as in the first embodiment. Therefore, even when the cap 33 is screwed into the screw portion 31 of the coloring 16, the coloring 16 does not rotate unnecessarily.
There is an advantage that the attaching and detaching work of the cap 33 can be performed smoothly.

<Third Embodiment> FIG. 5 shows a syringe according to a third embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description will be simplified. The feature of this syringe is that the height of the tip of the collar 30 is set to be equal to or higher than the height of the tip of the nozzle 12 and protrude outward. A screw portion 3 for cap fixing is further provided on the tip side of the screw portion 13a for fixing the needle base flange.
1 is provided.

That is, screw portions 13a and 31 having different inner diameters are provided on the inner peripheral portion of the collar portion 30 provided on the cylinder tip 11.
However, it is formed concentrically so that the screw portion 31 having the larger inner diameter comes to the front end side. The height of the distal end of the collar portion 30 where the screw portion 13a having the larger inner diameter is formed is set to be equal to or higher than the distal end of the nozzle 12.

On the other hand, the cap 33 has a nozzle fitting portion 3 fitted on the outer periphery of the nozzle 12 from the base end toward the tip.
4, a structure including a flange 35 and a cap body 36 is provided. The outer diameter of the flange 35 is set to be larger than the diameter of the flange 8 a of the needle base 8 of the injection needle 7, and the flange 35 is attached to the cap fixing screw portion 31 on the inner peripheral surface tip side of the collar portion 30. It is screwed.

However, also in this embodiment, the height of the tip of the collar portion 30 is set to be approximately the same as or higher than the tip of the nozzle 12, and therefore, as in the first embodiment described above, before the injection. In the preparatory stage, even after the cap 33 for protecting the nozzle is removed and before the injection needle 7 is attached, it is possible to prevent the hand or clothes of the operator from coming into contact with the tip of the nozzle 12. Therefore, the sterility of the nozzle 12 can be easily maintained. Also, in this embodiment,
Since the collar portion 30 is provided with two types of screw portions 13a and 31 for fixing the injection needle and for fixing the cap, the pitch and the size of the teeth of the screws are arbitrary so as to be different between the injection needle side and the cap side. In addition, when the cap 33 is removed, there is an advantage that the screw portion 13a for fixing the syringe is not likely to be damaged.

<Fourth Embodiment> FIG. 6 shows a syringe according to a fourth embodiment of the present invention. In this embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and the description will be simplified. The feature of this syringe is that a cap 33 for protecting the nozzle is attached to the collar portion 30 by concave and convex fitting instead of screwing, and a flange 35 formed on the cap 33 is fixed to the collar portion when the cap is fixed. This is the point where it comes into contact with the tip of 30. The color section 3
The point that the tip height of 0 is set to be equal to or higher than the tip of the nozzle 12 is the same as in the third embodiment.

A ring-shaped groove 40 is formed on the inner peripheral surface of the distal end portion 30a of the collar portion 30. Meanwhile, cap 3
The diameter of the flange 35 formed substantially at the center of the collar 3 is set to be equal to or larger than the outer diameter of the collar 30. On the lower surface of the flange 35, a ring-shaped protruding portion 41 fitted to the inner peripheral surface of the distal end portion 30a of the collar portion 30 is provided concentrically with the cap body 36 and the flange 35. An engaging projection 42 corresponding to the ring-shaped groove 40 on the collar portion side is provided on the outer peripheral surface of the tip of 41. Then, the lower surface of the flange 35 abuts on the tip of the collar portion 30, and the engaging projection 42 engages with the ring-shaped groove 40 of the collar portion 30 so that the cap 33 is fixed to the barrel 11. Has become.

In this embodiment, the height of the tip of the collar portion 30 is set to be equal to or higher than the tip of the nozzle 12, so that the height of the collar portion 30 is different from that of the first or second embodiment. Similarly, even after removing the nozzle protection cap 33 and before attaching the injection needle 7, it is possible to prevent the operator's hand or clothing from contacting the tip of the nozzle 12.

After the cap is attached, the contact portion S between the flange 35 and the collar portion 30 is sealed by means such as heat sealing, so that the protection of the nozzle 12 by the collar portion 30 and the virginity of the cylinder tip 11 are guaranteed. In addition, the cap 33 can be formed into a snap-type structure that can be easily removed instead of being screwed.

<Fifth Embodiment> FIGS. 7 and 8 show a syringe according to a fifth embodiment of the present invention. In this embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and the description will be simplified. The feature of this syringe is that the cap 33 moves from the proximal end toward the distal end,
4. Projection 50, flange 35, and cap body 36
When the cap is fixed, the flange 35 comes into contact with the tip of the collar portion 30 so that the protrusion 50
The screwing of the protrusion 51 provided at the tip of the collar portion 30 into the collar portion 30 is stopped. The point at which the tip of the collar portion 30 is set to be the same height as the tip of the nozzle 12 or protrudes outward therefrom, and a cap fixing portion on the inner peripheral surface at the tip side of the collar portion 30. Screw part 3
1 is the same as in the third embodiment.

The flange 3 of the cap 33 set to be equal to or larger than the outer diameter of the collar portion 30
On the lower surface of 5, the protruding portion 50 is provided concentrically with the cap body 36, the flange 35 and the like. Projection 50
Are formed in an arc shape as shown in FIG. 8, and are provided in a pair at positions facing each other with the nozzle fitting portion 34 interposed therebetween. A projection 51 that is screwed into the cap fixing screw portion 31 is formed on the outer peripheral surface of the distal end of the arc-shaped projection 50.

In this embodiment, as in the above embodiments, the height of the tip of the collar portion 30 is set to be substantially the same as or higher than the tip of the nozzle 12, so that the nozzle protection Even after the cap 33 is removed and before the injection needle 7 is attached, the operator's hand or clothes can be prevented from contacting the tip of the nozzle 12.

In this embodiment, when the cap is fixed, the flange 35 comes into contact with the front end of the collar portion 30 so that the screwing of the projection 51 into the fixing screw portion 31 of the collar portion 30 is stopped. , A firm and reliable screwing can be realized. Also in this embodiment, as in the third embodiment, after the cap is attached, the contact portion S between the flange 35 and the collar portion 30 is sealed by means such as heat sealing, so that the nozzle 12 And the virginity of the barrel 11 can be guaranteed. In each of the above embodiments, an example in which the present invention is applied to a general syringe has been described. However, the present invention is not limited to this, and the present invention can be applied to a so-called prefilled syringe that is also used as a container. Needless to say.

[0037]

According to the first aspect of the invention, a color ring made of a separate member is provided on the outer periphery of the collar portion, and the height of the tip of the color ring is made higher than the tip of the inner nozzle.
Since the inner nozzle is protected, even after removing the cap and before attaching the injection needle, it is possible to prevent the operator's hands and clothes from coming into contact with the tip of the nozzle,
As a result, the sterility of the nozzle can be easily maintained.

According to the second aspect of the invention, in addition to the effects of the first aspect, the cylindrical collar ring fitted on the outer periphery of the collar portion projects upward from the collar portion. Since the screw portion for fixing the cap is formed on the inner peripheral surface of the portion, it is not necessary to provide the screw portion for fixing the cap on the collar portion, and the outer cylinder of the syringe can be easily formed.

According to the third aspect of the present invention, since the height of the tip of the collar portion is set to be equal to or higher than the tip of the nozzle, even after removing the cap and before attaching the injection needle, the operation can be performed. It is possible to prevent a person's hand or clothing from contacting the tip of the nozzle. In addition, since the screw portion for fixing the injection needle and the screw portion for fixing the cap are separately provided in the collar portion, the pitch and the size of the teeth of the screws are arbitrarily different so as to be different between the injection needle side and the cap side. There are advantages such as being able to be set, and there is no risk of damaging the screw portion for fixing the syringe when removing the cap.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect, a cap for protecting the nozzle is attached to the collar portion by fitting concave and convex, and is formed on the cap when the cap is fixed. Since the flange to be brought into contact with the front end of the collar portion, the cap can be fixed to the collar portion by a snap-on method that is easy to remove. In addition, it is possible to easily realize an unopened (virgin) structure of the cap until the cap is removed, for example, by heat-sealing the end of the flange and the collar that abut on each other.

According to the fifth aspect of the present invention, in addition to the third aspect of the present invention, when the cap is fixed, the flange abuts on the front end of the collar portion to stop the projection from being screwed into the collar portion. As a result, the cap can be firmly screwed to the collar portion, and the virgin structure described above can be easily realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a syringe showing a first embodiment of the present invention.

FIG. 2 is a view as seen in the direction of the arrow X in the embodiment.

FIG. 3 is a sectional view of the cap according to the embodiment.

FIG. 4 is a sectional view of a main part of a syringe showing a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a syringe showing a third embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a syringe showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a syringe showing a fifth embodiment of the present invention.

FIG. 8 is a sectional view taken along the line YY in FIG. 7;

FIGS. 9A and 9B show an injection needle, in which FIG. 9A is a partially sectional side view, and FIG. 9B is a sectional view taken along the line ZZ in FIG. 9A.

FIG. 10 is a cross-sectional view showing a conventional syringe.

[Explanation of symbols]

 7 Injection needle 8 Needle base 8a Flange under needle base 10 Outer cylinder 11 Cylinder tip 12 Nozzle 13 Collar part 13a Screw part for fixing injection needle 16 Color ring 17 Ring groove 18 Convex part 30 Collar part 31 Provided on collar part Screw part for cap fixing 35 Cap flange 36 Cap body 40 Ring-shaped groove 42 Engagement convex part 50 Projection part 51 Projection

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61M 5/178-5/34

Claims (5)

(57) [Claims] 1. An outer cylinder having a cylinder tip on one end side and a finger grip on the other end side, and an inner cylinder slidably fitted inside the outer cylinder along a length direction, A nozzle and a collar portion disposed concentrically with the nozzle outside the nozzle are provided at the tip of the outer cylinder, and a needle base flange of an injection needle is provided on a screw portion formed on an inner peripheral portion of the collar portion. In a syringe in which a needle base of an injection needle is fixed to the nozzle by being screwed, a cylindrical color ring is fitted around an outer periphery of the collar portion, and a tip of the color ring is a tip of the nozzle. A syringe having a height equal to or protruding outward from the same. 2. The syringe according to claim 1, wherein a nozzle is provided on an inner peripheral surface of a projecting portion of the cylindrical collar ring fitted to an outer periphery of the collar portion, the projection projecting above the collar portion. A syringe, wherein a cap fixing screw portion with which a protective cap is screwed is formed. 3. An outer cylinder having a cylinder tip on one end side and a finger grip on the other end side, and an inner cylinder slidably fitted along the length direction inside the outer cylinder, A nozzle and a collar portion disposed concentrically with the nozzle outside the nozzle are provided at the tip of the outer cylinder, and a needle base flange of an injection needle is provided on a screw portion formed on an inner peripheral portion of the collar portion. In a syringe in which the needle base of the injection needle is fixed to the nozzle by being screwed, the tip of the collar portion projects at a height equal to or higher than the tip of the nozzle, and furthermore, the collar A syringe for forming a cap for screwing a cap for nozzle protection on the distal end side of the thread for fixing the needle and the flange at an inner peripheral portion of the portion. 4. The syringe according to claim 3, wherein the cap for protecting the nozzle is attached to the collar portion by a concave and convex fit instead of screwing, and a flange formed on the cap when the cap is fixed. A syringe abutting on a tip of the collar portion. 5. The syringe according to claim 3, wherein the cap includes a projection, a flange, and a cap body from a base end toward the tip, and the flange is attached to a tip of the collar portion when the cap is fixed. The syringe stops the screwing of the protrusion into the collar portion by the contact.