Syringe with movable injection needle and pseudo-pain point needle

Abstract

To provide a syringe which is excellent in handling of an injection needle, eliminates danger before and after use and anxiety in terms of hygiene, and eliminates anxiety of invasion by the injection needle even during use.SOLUTION: The syringe is composed of a syringe barrel 1, a gasket 2 with a needle, and a plunger 4 mounted with a gasket 3. In the syringe barrel 1, a container body 11 and a protection body 12 are integrally formed, and the protection body 12 is separated from a connection part 13 by cleavage for use. The injection needle 22 is housed in the container body 11, and by operating the plunger 4 at the time of use, the injection needle 22 is exposed to the outside of the container body 11 and inoculated into the skin. At this time, the two projections 11C1 and 11C2 at the tip of the vessel body 11 come into contact with the skin and press the skin to such an extent that the epidermis and the dermis are not attacked, thereby giving pains different from the pains caused by the injection needles 22 and disguising the pains to reduce the pains caused by the injection needles 22. After use, the needle-equipped gasket 2 is returned into the container body 11 again to accommodate the injection needle.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to syringes having needles that are movable and can be exposed and retracted, and to syringes having a dummy needle separate from the needle. [Background technology]

[0002] Currently, there are various routes of administration for pharmaceuticals in medical practice, with the oral route and the injection route being representative of the most commonly used routes.

[0003] The oral route is the most commonly used method for daily drug administration. As long as the drug is selected and dispensed correctly, and the timing of administration is correct, major errors are unlikely to occur, and it is a convenient, simple, and safe administration method compared to the injection route. Therefore, the current situation is that oral administration of drugs in home treatment is left to the discretion of the individual patient. Dosage forms used include tablets, capsules, and powders.

[0004] However, when administered orally, drugs are absorbed in the digestive tract, such as the stomach and small intestine, and so these drugs can cause gastrointestinal disorders or be broken down by gastric acid in the digestive tract (especially the stomach). There are also problems, such as the fact that it takes some time for the drug to take effect after absorption, making the onset of effect unstable. Another problem is that drug absorption varies depending on the state of the digestive tract.

[0005] On the other hand, in the case of pharmaceuticals that are broken down in the digestive tract or that cannot be absorbed in the digestive tract, the injection route is particularly effective. Specifically, there are several administration routes, including intravenous, intramuscular, subcutaneous, and intradermal, and by selecting the appropriate route, the pharmacokinetics of the pharmaceutical can be controlled.

[0006] In other words, by injecting medicines directly into the body using a needle, the effect is quick and stable. Because the injection route allows medicines to be administered directly to the necessary area (affected area), it takes less time for the effects to begin to appear than other administration methods. It is also a more reliable method because it can administer medicines that are filtered out during absorption, transformed into other substances, or broken down by detoxification during absorption.

[0007] As such, medication via injection has advantages over oral administration. Due to its effectiveness, self-injection is permitted even in countries where injections are restricted to medical procedures performed by doctors (such as Japan). Examples of use include insulin injections for diabetes treatment, heparin injections for preventing infertility, and self-injection of blood clotting factor drugs for the treatment of hemophilia. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent Summary of the Invention [Problem to be solved by the invention]

[0009] However, injections are not yet widely used and have the following five inherent problems: 1. Potential dangers when handling syringe needles (needlestick injuries, etc.) 2. Risks of using medicines (mistakes in the selection and dosage of medicines) 3. Hygiene management of syringes (storage accidents and reuse) 4. The dangers of injections (depth of injection) 5. Pain when using a syringe (skill or inability to inject, irritation of the drug)

[0010] Needle-free syringes have been considered as a solution to some of the problems mentioned above, but they have not been widely adopted due to reasons such as their high cost, the loud impact noise they make when discharging the drug solution, and the risk of secondary infections due to the reuse of expensive injectors.

[0011] On the other hand, syringes with needles are the most widely used, and their basic structure has remained unchanged for many years. This shows that they are simple and inexpensive to make. However, because a hollow needle is inserted into living tissue, there are still problems with the invasiveness of this method and the actual damage it can cause. Furthermore, existing syringes are still problematic in that they are not completely virgin or capable of dealing with infection control.

[0012] The present invention has been made in view of the above points, and its object is to provide a syringe that is easy to handle with a syringe needle, eliminates concerns about danger and hygiene before and after use, and eliminates concerns about invasiveness caused by the syringe needle even during use. [Means for solving the problem]

[0013] In order to solve the above problems, the present invention provides the following.

[0014] A syringe comprising: a hollow cylindrical container body; and a protective body that closes one end of the container body and is continuous with the inside and outside of the container body, wherein the protective body has a needle hole formed therein that protects a syringe needle placed inside the container body.

[0015] According to the present invention, the syringe has a protector that closes one end of the container body, and a needle hole that is formed continuous with the inside and outside of the container body and protects the injection needle, so that the injection needle is housed in the needle hole within the container body and protected. Since the injection needle is housed within the container body by the protector and one end is closed, the injection needle is not exposed to the outside air until it is actually used, which is excellent in terms of hygienic management in terms of storage of the syringe and injection needle.

[0016] The protector can be formed integrally with the container body so as to be easily detachable, or attached separately from the container body (for example, as a cap), etc. The needle hole is formed in the container body so that the injection needle is housed within the container body and is not exposed outside the container body even when the protector is detached.

[0017] A syringe characterized in that a tip on one end side of the container body is formed with a protrusion protruding from the tip surface.

[0018] According to the present invention, when the tip surface is brought into contact with the skin to administer an injection, the protrusion presses against the skin, causing a pain different from the pain of a needle prick, making it difficult to feel the pain of an injection. This protrusion functions as a so-called pseudo-pain needle, disguising the pain of being pricked by another needle in the area around the injection needle. This solves the problem of pain during use, which requires skill (requires experience) to administer an injection with minimal pain, and which can cause unnecessary pain if administered poorly.

[0019] A syringe characterized in that the bottom surface of the needle hole is located higher than the tip surface of the container body.

[0020] According to the present invention, since the bottom surface of the needle hole is located above the tip surface of the container body, the injection needle can be kept contained within the container body before use, eliminating the concern of damaging the skin or the inside of the skin before use and avoiding the dangers that may be present when handling an injection needle.

[0021] The protector has a tip portion protruding from the tip surface of the container body and a gasket receiving portion in which the needle hole portion is formed, and is a syringe formed with a connecting portion that connects the tip portion and the gasket receiving portion to the container body, characterized in that by applying force to the tip portion, the connecting portion breaks and the container body and the protector can be separated.

[0022] According to the present invention, by applying force to the tip by rotating it around the central axis or by bending it, the connecting part breaks, and the container body and the protector (tip part and gasket receiving part) can be separated by cleavage. This allows the injection needle to be kept sealed until use, preventing contamination of the syringe and injection needle and providing excellent hygiene management. Furthermore, by utilizing the cleavage properties of the material used, the cross section can be formed to be flat and smooth. As a result, even if the connecting part (cut surface) is pressed hard against the skin, the cut surface will not damage the skin, ensuring safety.

[0023] A syringe characterized in that a needle-equipped gasket having a syringe needle positioned and fixed in the gasket receiving portion and abutting against the inner peripheral surface of the container body is disposed in the gasket receiving portion.

[0024] According to the present invention, since the needle gasket is disposed in the gasket receiving portion, the needle gasket supported by the gasket receiving portion is housed within the container body. Furthermore, even after the protective portion (gasket receiving portion) is removed by removing the cap or cleaving it, the needle gasket remains in contact with the inner peripheral surface of the container body, so the injection needle can remain housed within the container body. This eliminates concerns about injuring the skin or the inside of the skin before use and avoids potential dangers associated with handling the injection needle. Furthermore, since the injection needle is housed within the container body, the patient does not see the injection needle before, during, or after use, which reduces psychological stress, such as fear, in the patient.

[0025] The syringe is characterized in that the needle gasket has an introduction path for guiding a medicinal solution to the injection needle, and has a partition wall in the introduction path that serves as a contact surface with the medicinal solution.

[0026] According to the present invention, a needle-attached gasket has an introduction path and a partition wall in the introduction path that serves as the contact surface with the medicinal solution. This partition wall separates the introduction path into an upstream side filled with the medicinal solution and a downstream side empty of the medicinal solution, preventing the medicinal solution from easily flowing into the injection needle. The needle-attached gasket moves just before inoculation, but this movement prevents the medicinal solution from being unnecessarily released from the injection needle before inoculation. A predetermined pressure is applied to break or penetrate the partition wall, allowing the medicinal solution to flow into the injection needle. Note that if the viscosity of the medicinal solution to be ingested is high and there is a large pressure loss when it flows out of the injection needle, this partition wall is not necessary.

[0027] A syringe characterized in that the partition has a notch or a mechanism for breaking and penetrating the notch.

[0028] According to the present invention, the partition wall having cuts can control the degree to which the drug solution breaks or penetrates the partition wall. The number, depth, shape, etc. of the cuts can be set depending on the properties (viscosity, etc.) of the drug solution. In addition, the degree of breakage and penetration can also be controlled by providing the partition wall with a breakage and penetration mechanism.

[0029] The syringe is characterized in that the container body has an inner wall portion located above the one end side and protruding inward.

[0030] According to the present invention, the container body has an inner wall portion located above one end and protruding inward, so that the movable needle gasket cannot move below the inner wall portion and functions as a stopper for the needle gasket. This restricts the movable range of the needle gasket and appropriately designs the length of the injection needle, thereby preventing the injection needle from penetrating the skin excessively. In other words, the injection needle can be inserted to an appropriate depth for each type of injection, such as intradermal injection, subcutaneous injection, or intramuscular injection, which contributes to the selection of a syringe according to the application site, such as the injection location and depth.

[0031] A syringe having a gasket at its tip that abuts against the inner circumferential surface of the container body, and a plunger that is disposed on the other end side of the container body.

[0032] According to the present invention, the plunger is disposed at the other end of the container body, and both ends of the container body are kept closed by the plunger and the protector, preventing contact with the outside air, which is excellent for maintaining hygiene of the syringe. Furthermore, since only the gasket remains inside the container body when the plunger is pulled back, it is possible to prevent the re-injection of the medicinal liquid into the syringe, and it is possible to prevent the reuse of syringes.

[0033] The gasket and the plunger are connected by a connector, and the connector moves the gasket when the plunger is pressed, and detaches from the gasket when the plunger is pulled out.

[0034] According to the present invention, the gasket and plunger are connected by a connector, and the connector moves the gasket when the plunger is pressed, so that the plunger and gasket are pressed via the connector and move to the bottom of the container body. Meanwhile, when the plunger is pulled out, it detaches from the gasket, so the plunger and gasket are separated, and only the plunger is pulled out of the container body, while the gasket remains inside the container body. This prevents the container body from being refilled with medicinal liquid, preventing the reuse of syringes and injection needles and providing excellent hygiene management.

[0035] The syringe is characterized in that the plunger has a spring body that returns to its original position in a direction opposite to the direction in which it is pressed. A syringe characterized in that a spring body is provided between the needle gasket and the inner wall portion, the spring body restoring in a direction opposite to the pressing direction of the needle gasket.

[0036] According to the present invention, the pressed plunger or needle gasket is pulled back by the restoring action of the spring body, so that the needle gasket is also sucked in as the plunger moves or directly and pulled back into the container body. At this time, the injection needle is also pulled back into the container body, so that the used injection needle will not injure the skin or inside the skin, and the danger that may be present when handling injection needles can be avoided.

[0037] A syringe in which the container body is filled with a medicinal solution.

[0038] According to the present invention, by filling the container body with the necessary medicinal solution (completely virgin prefilled), problems such as incorrect selection of the medicinal product to be injected or incorrect dosage can be avoided. Furthermore, it is preferable to clearly indicate which medicinal product is filled and in what quantity. Furthermore, by designing the plunger so that it detaches from the gasket when pulled out, it becomes impossible to arbitrarily replace the medicinal solution already filled, preventing accidents and mistakes in medical settings and also contributing to preventing the reuse of syringes and needles.

[0039] A syringe characterized in that a storage section for storing an anesthetic is provided at the rear end of the plunger.

[0040] According to the present invention, a storage section for storing an anesthetic is provided at the rear end of the plunger, so that the anesthetic can be applied or attached to the skin before vaccination to alleviate pain during vaccination. [Effects of the Invention]

[0041] The syringe of the present invention has the effect of avoiding or resolving the problems inherent in conventional syringes (risks that may arise when handling the needle, mistakes in the medicine being introduced into the syringe, and pain during use), and providing a syringe that is excellent in terms of hygiene management and selection of application site. [Brief explanation of the drawings]

[0042] [Figure 1]1 is an exploded view of a syringe according to an embodiment of the present invention. FIG. [Figure 2] 1 is an assembly diagram of a syringe according to an embodiment of the present invention. FIG. [Figure 3] FIG. 10 is a schematic diagram showing another example of a needle gasket. [Figure 4] 10A and 10B are diagrams for explaining the function of the protrusions. [Figure 5] FIG. 1 is an assembly diagram of a syringe using a plunger with a spring body. [Figure 6] FIG. 10 is an exploded view of another syringe according to an embodiment of the present invention. [Figure 7] FIG. 10 is an assembly view of another syringe according to an embodiment of the present invention. [Figure 8] FIG. 10 is an exploded view of another syringe according to an embodiment of the present invention. [Figure 9] FIG. 10 is an assembly view of another syringe according to an embodiment of the present invention. [Figure 10] FIG. 10 is an exploded view of another syringe according to an embodiment of the present invention. [Figure 11] FIG. 10 is an assembly view of another syringe according to an embodiment of the present invention. [Figure 12] FIG. 10 is a diagram illustrating a storage section that stores an anesthetic agent. [Figure 13] FIG. 10 is a diagram illustrating how to use the syringe. [Figure 14] FIG. 10 is a diagram illustrating how to use the syringe. [Figure 15] FIG. 10 is a diagram illustrating how to use the syringe. BEST MODE FOR CARRYING OUT THE INVENTION

[0043] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0044] (First syringe and basic configuration of syringe) Fig. 1(A) is an exploded view of a syringe according to an embodiment of the present invention, Fig. 1(B) is a view of a plunger 4 seen from above, and Fig. 2 is an assembled view of the syringe according to an embodiment of the present invention. In Fig. 1 and Fig. 2, the syringe is composed of a syringe barrel 1, a gasket 2 with a needle, and a plunger 4 to which a gasket 3 is attached.

[0045] Syringe barrel 1 is integrally formed with hollow cylindrical container body 11 and protector 12 that closes the lower end (one end) of container body 11. Container body 11 has ring-shaped upper handle 11a on the side surface of the upper end, ring-shaped lower handle 11b on the side surface slightly above the center, two protrusions 11C1 and 11C2 on the lower end (one end), and ring-shaped inner wall 11d that protrudes toward the center from the inner wall surface of container body 11. The number of protrusions is not limited to two; it may be one or more. Furthermore, their shapes are not particularly limited, and may be cylindrical, prismoid, conical, pyramidal, or the like. When pressed firmly against the epidermis, they should be sharp (or dull) enough not to damage the surface, and should produce a feeling of pressure and mild pain.

[0046] Furthermore, the protector 12, which is integrally formed with the container body 11, is formed with a knob portion 12a, a gasket receiving portion 12b, and a pinhole portion 12c formed in the gasket receiving portion 12b. Furthermore, a ring-shaped connecting portion 13 is formed to connect the container body 11 and the protector 12. When the protector 12 is a cap type, the lower end (one end) of the container body 11 functions as the connecting portion 13, and by rotating the cap, the connection by the connecting portion 13 can be released, and the container body 11 and the protector 12 can be separated.

[0047] Furthermore, the container body 11 and the protector 12 can be separated by applying a force such as twisting or bending to the handle portion 12a, which breaks the connecting portion 13. When the container body 11 and the protector 12 are integrally formed, the bottom end surface 11e of the container body 11 and the top end surface 12d of the handle portion 12a of the protector 12 are formed in relatively different directions, and the connecting portion 13 is formed thin, which reduces the force required for cleavage and reduces the number of cleavage surfaces (connecting portion 13) generated by cleavage.

[0048] Furthermore, by using a cleavable material, the separated cleavage surface (connecting portion 13) is smooth, eliminating the risk of damaging the skin with the separated surface of connecting portion 13 when the tip of syringe 1 is pressed against the skin before withdrawing the injection needle. Therefore, when syringe 1 is pressed perpendicularly against the skin, the broken and separated connecting portion 13 can be pressed firmly against the skin, maintaining its cross section in contact with the skin surface, thereby enabling the insertion depth of injection needle 22 to be constant. In other words, it becomes possible to specify the desired insertion depth of injection needle 22 for subcutaneous injection, intramuscular injection, etc. Conversely, with a cut surface having a connecting portion 13 with significant unevenness, the insertion depth of injection needle 22 will be inconsistent, and ideal injections will be impossible with a cut surface that damages the epidermis.

[0049] The cleavable material is a known resin composition obtained by polymerizing hydrogen, methyl, fluorine, etc., and having a number-average molecular weight of 1 x 10 to 1 x 10. Highly crystalline materials tend to break into fragments, while malleable and ductile materials such as PET tend to break into burrs and splinters without breaking. On the other hand, the resin composition has an appropriate hardness, can be expected to break cleanly, and can prevent the formation of fragments.

[0050] The needle gasket 2 has a gasket 21 and an injection needle 22. The gasket 21 is integrally formed with a hollow cylindrical upper ring portion 21a, a coaxial hollow cylindrical middle ring portion 21b, and a coaxial hollow cylindrical lower ring portion 21c.

[0051] The upper ring portion 21a has an outer diameter that is approximately the same as the inner wall diameter of the container body 11, and prevents the medicinal liquid 5 filled in the container body 11 from flowing out downward. An introduction path 21d for guiding the medicinal liquid 5 to the injection needle 22 is formed in the hollow portion of the upper ring portion 21a. This introduction path 21d has a shape that tapers toward the tip as it goes downstream. An injection needle hole 21e for inserting and fixing the injection needle 22 is formed in the hollow portions of the middle ring portion 21b and the lower ring portion 21c, and the injection needle 22 is inserted into the injection needle hole 21e. The introduction path 21d and the injection needle hole 21e are integrally formed and communicate with each other.

[0052] The outer diameter of the lower ring 21c is approximately the same as the inner wall diameter of the container body 11, and together with the upper ring portion 21a, it prevents the drug solution 5 filled in the container body 11 from leaking downward. The outer diameter of the middle ring portion 21b is smaller than the upper ring portion 21a and the lower ring portion 21c, and is smaller than the inner wall diameter of the container body 11, thereby reducing sliding friction caused by the movement of the needle gasket 2.

[0053] The gasket 3 is integrally formed with a hollow cylindrical upper ring portion 31a, a coaxial hollow cylindrical middle ring portion 31b, and a coaxial hollow cylindrical lower ring portion 31c. The outer diameter of the upper ring portion 31a is approximately the same as the inner wall diameter of the container body 11, preventing the medicinal solution 5 filled in the container body 11 from leaking upward or from flowing downward when the syringe is turned upside down. The outer diameter of the lower ring portion 31c is approximately the same as the inner wall diameter of the container body 11, preventing the medicinal solution 5 filled in the container body 11 from leaking upward or from flowing downward when the syringe is turned upside down, in cooperation with the upper ring portion 31a. The outer diameter of the middle ring portion 31b is smaller than the outer diameters of the upper ring portion 31a and the lower ring portion 31c, and is smaller than the inner wall diameter of the container body 11, thereby reducing sliding friction caused by the movement of the gasket 3.

[0054] The upper ring portion 31a and the middle ring portion 31b of the gasket 3 are integrally formed with communicating hollow portions 31d, 31e, respectively, with the hollow portion 31d having a small diameter and the hollow portion 31e having a large diameter. That is, the connector 41c inserted into the hollow portion can move with play in the large diameter region, and the gasket 3 can be moved downward as the plunger 4 is pressed.

[0055] Meanwhile, as plunger 4 is pulled out, connecting body 41c separates from gasket 3, separating plunger 4 and gasket 3. The separation of plunger 4 and gasket 3 can be facilitated by air hole 43 provided in plunger 4, and the action of air hole 43 requires a large force to pull out plunger 4, releasing the connection of connecting body 41c. This basic operation is also the same in the syringes shown in Figure 5 and subsequent figures.

[0056] The plunger 4 is integrally formed with a disk-shaped handle portion 41a and a cylindrical or columnar plunger body portion 41b, and a connector 41c with a T-shaped cross section is connected to the lower end of the plunger body portion 41b. The connector 41c is inserted into the upper ring portion 31a and the middle ring portion 31b of the gasket 3.

[0057] Here, the fit between gasket 3 and plunger 4 is made weak or non-existent so that plunger 4 easily separates from gasket 3, preventing movement of gasket 3 left behind in container body 11. This prevents refilling of the drug solution between needle gasket 2 and gasket 3. Alternatively, the same effect can be achieved by making connector 41c connecting gasket 3 and plunger 4 easily separate from gasket 3, preventing movement of gasket 3 left behind in container body 11.

[0058] Thus, a syringe comprising syringe barrel 1, needle gasket 2, and plunger 4 fitted with gasket 3 is assembled and manufactured as follows, and then used. (1) The needle gasket 2 is inserted into the container body 11 of the syringe barrel 1 from the upper end of the opening until it abuts against the gasket receiving portion 12b. At this time, the syringe needle 22 is housed in the needle hole portion 12c. (2) With the container body 11 of the syringe barrel 1 filled with a specified amount of medicinal liquid 5, the plunger 4 fitted with the gasket 3 is attached. (3) When in use, applying force to the knob portion 12a breaks the connecting portion 13, separating the container body 11 from the protector 12. This allows the injection needle 22 to come into contact with the outside air for the first time. (4) By pressing down the plunger 4 so as to shorten the relative distance between the handle portion 41a and the upper handle portion 11a, the load pressure of the medicinal solution 5 caused by the movement of the gasket 3 pushes out the needle gasket 2, exposing the injection needle 22 from the syringe barrel 1 and administering it to the patient. The movable range of the needle gasket 2 is restricted by the inner wall portion 11d acting as a stopper. (5) After the injection, confirm that the injection needle 22 has been removed from the patient and then pull out the plunger 4. The load pressure inside the container body 11 caused by the movement of the gasket 3 pushes up the needle-attached gasket 2, and the injection needle 22 enters the syringe barrel 1. (6) If the plunger 4 is further pulled out, the plunger 4 and the gasket 3 are separated by the action of the connector connecting the plunger 4 and the gasket 3, and the plunger 4 can be pulled out of the container body 11, but the gasket 3 remains inside the container body 11.

[0059] 3A and 3B are schematic diagrams showing another example of a needle gasket 2', where (A) is a cross-sectional view and (B) is a cross-sectional view taken along line AA. For ease of explanation, the syringe needle 22 is not shown. The needle gasket 2' may also be used in the second, third, and fourth syringes.

[0060] The needle gasket 2' is integrally formed with a hollow cylindrical upper ring portion 21a, a coaxial hollow cylindrical middle ring portion 21b, and a coaxial hollow cylindrical lower ring portion 21c, and the outer diameter of each ring portion is the same as that of the needle gasket 2. The introduction path 21d is formed through the upper ring portion 21a and the middle ring portion 21b, and the injection needle hole 21e is formed through the middle ring portion 21b and the lower ring portion 21c.

[0061] A U-shaped cross-section of the medicinal solution retainer 23 is fitted into the upper ring portion 21a and abuts against the outer wall 23b, and the introduction path 21d is divided into upper and lower sections by the upper disk 23a. The upper disk 23a has symmetrical cut lines 23c formed at the center of the circle, which control the outflow of the medicinal solution from upstream to downstream within the introduction path 21d. The upper disk 23a is made of soft rubber and serves to prevent the medicinal solution 5 from passing through to the injection needle 22 until a certain level of internal pressure is applied to the soft rubber membrane with the cuts. This prevents a small amount of the medicinal solution 5 from being released before the tip of the injection needle 22 pierces the skin when the gasket 3 advances, if the viscosity of the medicinal solution 5 contained therein is low.

[0062] As shown in Figure 4, human skin is composed of the epidermis, dermis, and subcutaneous tissue from the outside, with muscles and veins located in the subcutaneous tissue and deeper. It is believed that the pain felt when a needle is inserted into the skin is due to the needle hitting pain points distributed on the skin surface, with 100–200 pain points distributed per cm². Therefore, it is thought that using a very fine needle that avoids pain points as much as possible can reduce the pain during injection, and some syringes utilize such ultra-fine needles. However, even with a very fine needle, pain is still felt when the needle touches a pain point. Furthermore, when cells penetrated by the needle release "pain-inducing substances" such as potassium ions, serotonin, and acetylcholine, these reach the sensory nerve endings and cause pain. Therefore, local anesthesia has been considered as a reliable means of pain relief. For example, the pain of an injection can be alleviated by applying a patch or cream containing a local anesthetic containing lidocaine.

[0063] On the other hand, it is said that humans cannot feel multiple pains simultaneously, and if you experience another pain while receiving an injection, it is possible to mask the pain of the injection. Classic examples include pinching your thigh, pinching the injection site, or digging your fingernail into the injection site. By becoming accustomed to a different pain, the pain of the injection can be reduced. It is also said that the nerves that transmit pain are thin, while the sensations of touch and pressure are transmitted by thicker nerves. Furthermore, there is a phenomenon in which thicker nerves suppress the activity of thinner nerves. It is well known that rubbing or pressing can significantly relieve pain, and it is also common to experience that applying gauze and bandages to an injury can relieve pain.

[0064] Figure 4 is a diagram illustrating the function of the protrusions. Two protrusions 11C1 and 11C2 are brought into contact with the skin and pressed down to a degree that does not strike the epidermis or dermis (Figure 4(B)), causing pain to the skin through protrusions 11C1 and 11C2. During injection with injection needle 22, a different pain is caused by protrusions 11C1 and 11C2, allowing the subject to become accustomed to the different pain. The number of protrusions is not limited to two, and can be increased depending on the degree of pain. It is also possible to attach a protrusion having such protrusions to the lower end of a flat syringe for use.

[0065] Furthermore, by increasing the number of protrusions to form intermittent or continuous ring-shaped protrusions and applying pressure to the skin without striking the epidermis or dermis, the area pressed in a ring shape can be made ischemic and paralyzed. This stimulating pressure on the skin makes the patient almost completely unaware of the pain caused by the injection needle, thereby reducing the pain during vaccination.

[0066] FIG. 5 is an assembly diagram of a syringe using a spring-attached plunger 4, in which spring 6 is disposed on the outer peripheral surface of plunger body 41b. FIG. 5(A) shows the syringe before use, with spring 6 extended. FIG. 5(B) shows the syringe during use, with spring 6 contracted when plunger 4 is depressed to expose injection needle 22 from syringe barrel 1. FIG. 5(C) shows the syringe after use, with spring 6 returning to its original state and about to extend. Spring 6 is an elastic member that generates a restoring force in the opposite direction to the pressing direction, and is made of metal such as aluminum or stainless steel, or resin. In a syringe with such a spring 6, gasket 3 automatically moves due to its restoring force, without the need to pull up plunger 4. The resulting load pressure within container body 11 pushes needle gasket 2 upward, as if sucked in, and inserts injection needle 22 into syringe barrel 1.

[0067] Furthermore, in the second, third and fourth syringes, the basic operation using the spring body 6 is the same as that shown in FIG.

[0068] (Second syringe) Figure 6 is an exploded view of another syringe according to an embodiment of the present invention, and Figure 7 is an assembled view of another syringe according to an embodiment of the present invention. The syringe barrel 1, needle gasket 2, and plunger 4 equipped with gasket 3 are the same as those in Figure 5. The shape of gasket receiving portion 12b of protector 12 of syringe barrel 1 is different, but this is due to the convenience of arranging spring body 6 on the outer peripheral surface of plunger receiving portion 12b.

[0069] With this syringe, a spring body 6 is arranged below the needle gasket 2, and as the needle gasket 2 is pushed down during inoculation, a restoring force is generated in the spring body 6. After inoculation, the gasket 2 is pushed up by the restoring force of the spring body 6, and the injection needle 22 enters the syringe barrel 1 without the need to pull up the plunger 4.

[0070] (Third syringe) Fig. 8 is an exploded view of another syringe according to an embodiment of the present invention, and Fig. 9 is an assembled view of another syringe according to an embodiment of the present invention. The basic configuration of the needle gasket 2 is the same as that of the syringe in Fig. 5.

[0071] Unlike the syringe in Figure 5, container body 11 of syringe barrel 1 does not have ring-shaped upper and lower handles. Furthermore, plunger 7 fitted with gasket 3 comprises outer wall 71a, plunger body 71b interlocking with outer wall 71a and spaced apart from it with a predetermined gap, and a connector 71c with a T-shaped cross section connected to the lower end of plunger body 71b. Spring 6 is disposed in the gap formed between plunger body 71b and outer wall 71a, with the upper end of spring 6 positioned on the upper surface of outer wall 71a and the lower end of spring 6 positioned on the upper end surface of the opening of container body 11.

[0072] With this syringe, the gasket 3 moves automatically due to the restoring force of the spring body 6 without the need to pull up the plunger 7, and the resulting load pressure within the container body 11 pushes up the needle-attached gasket 2, causing the injection needle 22 to enter the syringe barrel 1.

[0073] (Fourth syringe) Fig. 10 is an exploded view of another syringe according to an embodiment of the present invention, and Fig. 11 is an assembled view of another syringe according to an embodiment of the present invention. The syringe shown in Fig. 5 has the same needle gasket 2, the syringe shown in Figs. 6 and 7 has the same syringe barrel 1, and the syringe shown in Figs. 8 and 9 has the same plunger 7.

[0074] With this syringe, a spring body 6 is arranged below the needle gasket 2, and as the needle gasket 2 is pushed down during inoculation, a restoring force is generated in the spring body 6. After inoculation, the gasket 2 is pushed up by the restoring force of the spring body 6, and the injection needle 22 enters the syringe barrel 1 without the need to pull up the plunger 4.

[0075] (anesthetic drug storage compartment) FIG. 12 is a diagram illustrating the storage section 42, 72 that stores the anesthetic 8. The box-shaped storage section 42, 72 is provided on the upper part of the handle portion 41a located at the rear end of the plunger 4 or on the upper part of the outer wall portion 71a located at the rear end of the plunger 7. The anesthetic 8 is sealed in a sealed container, and when in use, the container is removed from the storage section 42, 72 and applied to the skin to provide topical anesthesia. The anesthetic 8 may also be in the form of a patch or cream, which is removed from the storage section 42, 72 and applied or affixed. It should be noted that even if the storage section 42, 72 is not provided separately, the rear end surface of the plunger 4, 7 may function as the storage section 42, 72, for example, by adhering the bottom surface of the sealed container to the rear end surface of the plunger 4, 7 with double-sided tape.

[0076] (How to use a syringe) A method of using the syringe will be described with reference to FIGS. (A) Figures 13(A) and 14(A) show the state before use. (B) Figures 13(A) and 14(A) show the state in which the protector 12 has been removed. From (A) to (B), a storage section 42 for storing an anesthetic 8 is provided at the tip of the handle of the plunger 4, and just before using the syringe, a hole is made in the storage section 42 and the anesthetic 8 is applied to the area where the injection needle 22 will come into contact. Figure 15(A) shows this process, and by anesthetizing the free nerve endings present in the epidermis and dermis, surface anesthesia is applied, reducing needle pain.

[0077] (C) Figures 13(C) and 14(C) show the state in which the plunger 4 is pushed in and the injection needle 22 is exposed. From (B) to (C), after topical anesthesia, the tip of the container body 11 is brought into contact with the skin, causing the protrusions 11C1 and 11C2 at the tip to dig shallowly into the skin, causing the brain to sense a protrusion piercing the skin. Also, even in the stage of gradually inserting the needle in (C), the injection needle 22 is inserted into the skin while the subject is under the illusion of pain caused by the protrusion piercing the skin.

[0078] (D) Figures 13(D) and 14(D) show the state in which the medicinal liquid 5 is being injected into the subcutaneous tissue. FIG. 15(B) shows this state, in which the drug solution 5 is injected into the subcutaneous tissue (about 2.3 mm below the skin surface) located below the epidermis (about 0.2 to 0.3 mm) and dermis (about 2 mm).

[0079] (E) Figures 13(E) and 14(E) show the state after all of the drug solution 5 has been injected. The gasket 3 and the needle gasket 2 are in contact with each other.

[0080] (F) Figures 13(F) and 14(F) show the state in which the plunger 4 has been removed from the syringe barrel 1. From (E) to (F), the needle gasket 2 having the injection needle 22 is pulled back by the restoring force of the spring 6 and stored in the main container 11. Furthermore, if the plunger 4 is pulled upward with force, the connection between the plunger 4 and the needle gasket 3 will be released, and the needle gasket 3 will be left inside the syringe barrel 1. In the state (F), the syringe cannot be reused by injecting the liquid medicine again between the gasket 4 and the needle gasket 3. [Industrial Applicability]

[0081] The syringe according to the present invention is useful as one that can be used safely, securely, and easily by anyone. [Explanation of symbols]

[0082] 1: Syringe barrel 2,2': Needle gasket 3: Gasket (31a: upper ring portion, 31b: middle ring portion, 31c: lower ring portion, 31d, 31e: hollow portion) 4: Plunger (41a: Handle portion, 41b: Plunger body portion, 41c: Connecting body) 5: Chemical solution 6: Spring body 7: Plunger (71a: outer wall portion, 71b: plunger body portion, 71c: connecting body) 8: Anesthetics 11: Container body (11a: upper handle portion, 11b: lower handle portion, 11C1, 11C2: protrusion portion, 11d: inner wall portion) 12: Protector (12a: knob portion, 12b: gasket receiving portion, 12c: needle hole portion) 13:Connection part 21: Gasket (21a: Upper ring portion, 21b: Middle ring portion, 21c: Lower ring portion) 21d:Introduction route 21e: Syringe needle hole 22: Syringe needle 23: Chemical solution holder (23a: upper disc 23b: outer wall) 42,72:Storage section 43,73:Air vents

Claims

1. A hollow cylindrical container body; a protector that closes one end of the container body and is continuous with the inside and outside of the container body; and The syringe is characterized in that the protector has a needle hole formed therein to protect the injection needle placed inside the container body.

2. 2. The syringe according to claim 1, wherein a protrusion is formed at a tip end of one end of the container body, protruding from the tip end surface.

3. 3. The syringe according to claim 1, wherein the bottom surface of the needle hole is located above the tip surface of the container body.

4. the protector has a tip portion protruding from a tip surface of the container body and a gasket receiving portion in which the pinhole portion is formed, A syringe having a connecting portion formed to connect the tip portion and the gasket receiving portion to the container body, 4. The syringe according to claim 1, wherein the connecting portion is broken by applying a force to the tip portion, and the container body and the protector can be separated.

5. 5. The syringe according to claim 4, wherein a needle-equipped gasket having a syringe needle positioned and fixed in the gasket receiving portion and abutting against the inner peripheral surface of the container body is disposed in the gasket receiving portion.

6. the needle-equipped gasket has an introduction path for guiding a drug solution to the injection needle; The syringe according to claim 5, further comprising a partition wall in the introduction path, the partition wall serving as a contact surface with the drug solution.

7. 7. The syringe according to claim 6, wherein the partition has a notch or a mechanism for breaking and penetrating the notch.

8. 8. The syringe according to claim 1, wherein the container body has an inner wall portion located above the one end side and protruding inward.

9. 9. The syringe according to claim 1, further comprising a gasket at a tip end thereof that abuts against an inner peripheral surface of the container body, and a plunger disposed on the other end side of the container body.

10. The gasket and the plunger are connected by a connector, The connecting body moves the gasket in response to the pressing operation of the plunger, The syringe according to claim 9, wherein the plunger is detached from the gasket when the plunger is pulled out.

11. 11. The syringe according to claim 9, wherein the plunger has a spring body that returns to its original position in a direction opposite to the direction in which the plunger is pressed.

12. 9. The syringe according to claim 6, further comprising a spring body between the needle gasket and the inner wall portion, the spring body restoring in a direction opposite to the pressing direction of the needle gasket.

13. The syringe according to any one of claims 1 to 12, wherein the container body is filled with a medicinal solution.

14. 14. The syringe according to claim 9, wherein a storage section for storing an anesthetic is provided at the rear end of the plunger.

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