JP2002210009A - Medical injector having thick opening end and method for forming the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical injector capable of reducing a residual liquid amount of a distal end and preventing an erroneous connection. SOLUTION: The medical injector comprises a tapered nozzle having an outer diameter smaller than that of a cylindrical body and formed at the end of the body. A part of the nozzle is connected to the body by insert molding. A mean thickness of the nozzle is larger than that of the body. At least part of the nozzle is identifiably colored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a tip structure of a medical injection device used for injecting and collecting a liquid into a non-vascular system.

[0002]

2. Description of the Related Art Recently, there has been an increasing interest in medical facilities for preventing artificial erroneous operations such as erroneous connection and erroneous injection. Originally, such a human error has a low frequency of occurrence, but it is necessary to consider its prevention means on the premise that it can always occur. Therefore, even if a medical practitioner makes a mistake, means for preventing the mistake from being missed at the stage of treatment and treatment of the patient or preventing treatment and treatment from being carried out as it is is being studied.

For example, in the case of erroneous connection, when a drug solution is injected into a living body, there is an example in which a substance to be orally administered is erroneously injected into a blood vessel, resulting in a problem relating to life and death. . This is a problem that occurs because the connections of the orally administered device and the transvascularly administered device are similar and can be connected to the connection of the administration line connected to the living body.

[0004] Therefore, in the industry, even if the connection portions of both (oral administration device and transvascular administration device) are to be inserted (connected) to the connection portions of different administration lines, they are physically inserted (connected). ) It is required to make the shape impossible. For this reason, manufacturers provide oral administration devices (injectors) having a thicker tip and a different shape as compared with transvascular administration devices to prepare for prevention of erroneous connection. That is, the connection portion at the tip of the oral administration device is standardized, and the connection port of the administration line and the connection portion of the administration line are also standardized in shape and dimensions so as to be adapted to that (the tip portion of the oral administration device). is there. It is also preferable to color these connections so that they can be identified by the purpose or type of administration. For example, if red is used for transvascular administration, yellow is used for oral administration, etc., so that misconnection is prevented by color identification. In this case, if the entire administration device is colored, it is difficult to check the contents thereof. Therefore, it is preferable to color only the distal end portion.

[0005]

As noted above, for oral administration, medical injectors having a thick and long tip have become standard. However, a molded product having such a tip portion has a problem that has not been known hitherto. The first is the problem of residual liquid remaining at the tip, and the second is the problem of molding. Injectors are available in various capacities depending on the type and purpose of the drug solution to be administered.However, by standardizing the injector tip as described above, a small-capacity injector tip can be replaced with a large-capacity injector. It is formed in the same way. Here, assuming that the residual liquid amount remaining at the distal end after injection is the same, the ratio of the residual liquid amount to the administered amount is high in a small-volume injector, so it is necessary to reduce the residual liquid amount at the distal end. is there.

Further, in order to achieve the above-mentioned reduction in the residual liquid amount when the injector is integrally molded, even if it is attempted to increase the thickness only at the tip, if the tip is thick and long, the molded product is shrunk by the molten resin. However, there is a problem that uniform products cannot be manufactured due to generation of air bubbles or large depressions on the inner surface side. There is also a method of separately molding the tip portion (connecting portion) and bonding / melting it to the main body (cylinder), but requires an extra step and is expensive.

To further color the tip, there is a method of applying a colorant such as ink to the surface thereof. However, if the material is made of polyolefin, the adhesiveness is poor, and the colorant may be eluted into the chemical due to falling off. Contamination is a concern. There is also a method of flowing a colored resin at the tip and flowing a non-colored resin at the main body. However, in order to manufacture the above-mentioned various-capacity products, the steps and apparatuses are complicated, and it takes time and cost. .

[0008]

According to the present invention, the above-mentioned problems have been solved by the following constitution. That is, the present invention is an injector in which a tapered nozzle having an outer diameter smaller than the outer diameter of the main body is formed at an end of the cylindrical main body, a part of the nozzle is joined to the main body by insert molding, A medical injector characterized in that the average thickness is larger than the average thickness of the main body, and at least a part of the nozzle is identifiably colored.

As the thickness of the nozzle becomes larger than that of the main body, the generation of bubbles and depressions increases, and it becomes difficult to integrally mold the nozzle and the main body. In addition to the above, it is very difficult to color only the nozzle portion by integral molding as described above. Therefore, after installing the colored insert part obtained by the separate molding at a predetermined position of the nozzle part of the mold, by pouring the resin for forming the main body into the mold, and forming the injector, the above-mentioned Obtain a medical injector.

[0010] By installing the insert part in the mold, the thickness of the nozzle portion can be increased, and the thickness can be freely changed within a certain range. Then, by performing the molding of the nozzle portion separately into the molding of the insert part and the molding of the outer part or the inner part thereof, it is possible to prevent the above-described troubles of bubbles and dents.

A second aspect of the present invention is the medical injector, wherein a part of the nozzle is formed of an insert part molded separately from the main body, and the insert part is colored. For example,
A part of the nozzle may be an inner surface side or an outer surface side, and the insert component may be exposed on either surface side. Although the insert component may be exposed on both surfaces, it is more preferable that the insert component is exposed on one of the inner surface side and the outer surface side in terms of bonding strength (peeling prevention).

A third aspect of the present invention is the medical injector described above, wherein the average thickness of the nozzle is 1.0 to 4.0 of the average thickness of the main body. When the injector is integrally molded, when the average thickness of the nozzle is 2.0 or more, the troubles described above become more remarkable and it becomes difficult to obtain a uniform product. The vessel is very useful. .

A fourth aspect of the present invention is the medical injector, wherein the axial length of the insert part is 0.2 to 0.9 of the axial length of the nozzle portion. Those in the above range are superior in visibility and nozzle strength as compared with those by other methods. When the value is less than 0.2, when the nozzle is connected to the receiving port, the insert part is hidden in the receiving port, and the color cannot be confirmed. When the nozzle is inserted into or removed from the receptacle, a force is applied near the boundary between the nozzle and the main body. If the ratio is 0.9 or more, the main body side end of the insert is located near the front boundary, and the insert may be broken at the end due to non-uniformity of the resin.

A fifth aspect of the present invention is a method for manufacturing the above-mentioned medical injector. That is, a method of manufacturing a medical injector having a cylindrical main body having a tapered nozzle formed at an end portion, wherein the colored insert part obtained by separate molding is formed into a predetermined shape of a nozzle part of a mold. After installing in the location of
A method for manufacturing a medical injector, wherein a resin for forming a main body is poured into the mold to form the injector.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS If the nozzle portion is opaquely colored, it is difficult to confirm the state of injection at the tip end portion. Therefore, it is preferable to color the nozzle portion transparently or translucently.
That is, a transparent or translucent colored insert part is separately formed, and when forming the injector main body, the insert part is installed at a predetermined position of the nozzle portion of the mold, and the resin for forming the transparent main body is made of gold. By pouring into a mold, it is possible to obtain a medical injector in which the inside of the nozzle portion can be confirmed even if it is colored.

As shown in FIG. 1, a step or an uneven shape may be formed on the surface of the insert component to make it difficult for the insert component to be detached from the injector after molding. The resin for forming the main body enters the step portion or the uneven portion, so that a strong joint can be obtained.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a sectional view schematically showing the distal end side of a medical injector 1 of the present invention. The medical injector 1 is similar to a normal syringe, but has a thick and long injection tip. According to the figure, a tapered nozzle 4 is formed at an end 3 of a cylindrical main body 2, and a part of the nozzle part 4 is formed of a separately formed insert part 5. The outside of the insert part is joined by a nozzle part forming part 6. Further, the insert part has a tapered shape in which the tip of a conical shape is cut off, and the whole is colored yellow with a transparent coloring agent so that it can be identified.

Further, the shape of the insert part is formed so that the thickness gradually changes at the distal end side 7 and the base end side 8, and a step 9 is formed at the distal end side.

In this embodiment, the average thickness d1 of the nozzle 4
Is 1.24 times the thickness d2 of the main body and 1.5 times the thickness of the insert part 5. Further, the axial length L1 of the insert part 5 is equal to 0.
It is 84 times.

[0020]

According to the present invention, a medical injector having a thick nozzle portion (compared to the thickness of the main body) can be formed stably (homogeneously) regardless of the size of the main body. This makes it possible to reduce the amount of residual liquid in the nozzle portion, and as a result, it can be applied to the administration of a small amount of a drug solution or to children and infants.

According to the color of the nozzle portion, it is possible to easily confirm the application and the type of chemical solution, and as a result, erroneous connection and human error can be reduced. Further, the coloring agent is not eluted into the chemical liquid as in the case where the surface of the nozzle is colored with ink, so that it is safe.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing the distal end side of a medical injector according to the present invention.

FIG. 2 is a schematic view showing an insert part according to the present invention.

FIG. 3 is a schematic diagram showing the shape and dimensions on the distal end side of the medical injector according to the present invention.

[Explanation of Codes] Medical injector 2. (Cylindrical) body 3. Body end 4. Nozzle (nozzle part) 5. Insert parts 6. Nozzle molding part 7. 7. Tip side Proximal side 9. Step d1. Average thickness of nozzle d2. Average body thickness d3. Average thickness of insert part L1. Axial length of insert part L2. Axial length of nozzle 4

Claims (5)

[Claims] 1. An injector in which a tapered nozzle having an outer diameter smaller than an outer diameter of a main body is formed at an end of a cylindrical main body, a part of the nozzle is joined to the main body by insert molding,
A medical injector wherein the average thickness of the nozzle is greater than the average thickness of the body, and at least a portion of the nozzle is identifiably colored. 2. The medical injector according to claim 1, wherein a part of said nozzle comprises an insert part molded separately from said main body, and said insert part is colored. 3. The medical injector according to claim 1, wherein the average thickness of the nozzle is 1.00 to 4.00 of the average thickness of the main body. 4. An axial length of said insert part is 0.2 to 0.9 of an axial length of said nozzle part.
The medical injector according to any one of the above. 5. A method for manufacturing a medical injector having a cylindrical main body having a tapered nozzle formed at an end thereof, the method comprising a step of molding a colored insert part obtained by separate molding into a nozzle of a mold. A method for manufacturing a medical injector, comprising: placing a resin for forming a main body in the mold after setting the injector at a predetermined position of the part; and forming the injector.