Syringe with movable needle and disguised pain-injecting 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 a syringe having a syringe needle, in which the syringe needle moves to be exposed and retracted, and also to a syringe having a disguised pain point needle separate from the syringe needle.

Background Art

[0002] Currently, there are various routes of drug administration in medicine. Representatives of widely and commonly used ones include the oral route and the injection route.

[0003] The oral route is the most widely used in daily drug administration. As long as the selection and dispensing of drugs are not mistaken, and in addition, the timing of ingestion is not mistaken, major mistakes are rarely made, and it can be said that it is a convenient, simple and safe administration method compared with the injection route. Therefore, at present, the oral administration of drugs is entrusted to individual patients in home treatment. The dosage forms used include tablets, capsules, powders, etc.

[0004] However, in oral administration, since drugs are absorbed in digestive organs such as the stomach and small intestine, gastrointestinal disorders may occur due to these drugs, or the drugs may be decomposed by gastric acid or the like in the digestive tract (especially the stomach). In addition, it takes some time until the onset of effect after absorption, and there are also problems such as unstable onset of effect. Furthermore, there is also a problem that the absorption of drugs varies depending on the state of the digestive tract.

[0005] On the other hand, in the case of drugs that are decomposed in the digestive tract or the like or are not absorbed in the digestive tract or the like, the injection route can be said to be particularly effective. Specifically, there are several administration routes such as intravenous, intramuscular, subcutaneous, and intradermal. By appropriately selecting these, the in vivo dynamics of drugs can be controlled.

[0006] In other words, the characteristic of this method is that the effects are rapid and stable because the drug is injected directly into the body using a needle. Because the injection route allows the drug to be administered directly to the necessary site (affected area), the time until the effects begin to appear is shorter than with other administration methods. Furthermore, it is a more reliable method because it can be used to administer drugs that would otherwise be filtered out, altered into other substances, or broken down by detoxification during the absorption process.

[0007] Thus, administering medication via injection has advantages over oral administration. Due to its efficacy, self-injection is permitted even in countries that restrict injections to medical procedures performed by physicians (such as Japan). Examples of use include insulin injections for diabetes treatment, heparin injections for the prevention of recurrent miscarriage, and self-injection of blood clotting factor drugs for the treatment of hemophilia. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Special Publication No. 2018-507732 [Patent Document 2] U.S. Patent No. 3,552,387 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] However, injections are not yet widely used or utilized. The following five problems are inherent to this situation. 1. Dangers inherent in handling hypodermic needles (such as needle stick injuries) 2. Dangers inherent in the use of pharmaceuticals (mistakes in the selection and dosage of pharmaceuticals) 3. Hygienic management of syringes (storage accidents and reuse) 4. Dangers inherent in injections (depth of injection) 5. Pain during syringe use (skill level of injection, irritation of the medication)

[0010] Needleless syringes have been considered as a solution to some of the problems mentioned above, but they have not become widespread due to reasons such as their high cost, the loud impact noise when dispensing the drug, and the risk of secondary infection from reusing 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 indicates that they are simple and inexpensive to manufacture. However, because they involve piercing living tissue with a hollow needle, the aversion to this invasive procedure and the actual harm caused by it remain issues. Furthermore, existing syringes still have problems with ensuring complete virginity and addressing infection control.

[0012] This invention has been made in view of these points, and its purpose is to provide a syringe that is easy to handle, eliminates concerns about danger and hygiene before and after use, and eliminates concerns about invasiveness from the injection needle even during use. [Means for solving the problem]

[0013] 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 extends both inside and outside the container body, wherein the protective body has a needle hole portion formed therein to protect the injection needle placed inside the container body.

[0015] According to the present invention, the syringe has a protective body that closes one end of the container body, and is formed in a continuous manner inside and outside the container body, with a needle hole portion formed to protect the injection needle. As a result, the injection needle is housed and protected in the needle hole portion inside the container body. Since the injection needle is housed inside the container body by the protective body 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 hygiene management for the storage of the syringe and injection needle.

[0016] The protective element can be integrally formed with the container body for easy separation, or it can be attached separately from the container body (for example, a cap). The injection needle is housed inside the container body, and the needle hole is formed inside the container body so that the injection needle does not become exposed outside the container body even when the protective element is separated.

[0017] A syringe characterized in that one end of the container body has a projection that protrudes from the tip surface.

[0018] According to the present invention, when the tip surface is brought into contact with the skin for injection, the projection compresses the skin, causing a pain different from the pain of a needle stick, thus making the actual pain of the injection less noticeable. This projection functions as a so-called disguised pain point, faking the pain of another needle being inserted around the area where the injection needle is inserted. This solves the problem of pain during use, which requires skill (expertise) to administer painless injections, or can increase pain if the injection is performed poorly.

[0019] A syringe characterized in that the bottom surface of the needle hole is located above the front 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 remain contained within the container body before use, eliminating concerns about damaging the skin or intradermal tissue before use and avoiding the dangers inherent in handling injection needles.

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

[0022] According to the present invention, by rotating around the central axis or applying a force to the tip by folding, the connecting part is damaged, and the container body and the protective body (tip and gasket receiving part) can be separated by splitting. Therefore, the injection needle can be kept in a sealed state until use, contamination of the syringe and the injection needle can be avoided, and it is excellent in terms of hygiene management. Further, by utilizing the splitting property of the material to be used, a flat cross-section without unevenness can be formed at the cross-section. Thereby, even when the connecting part (cut surface) is strongly pressed against the skin, the skin can be ensured safe without being damaged at the cut surface.

[0023] A syringe, characterized in that a gasket with a needle, which has an injection needle positioned and fixed thereto and abuts against the inner peripheral surface of the container body, is disposed on the gasket receiving part.

[0024] According to the present invention, since the gasket with a needle is disposed on the gasket receiving part, the gasket with a needle supported by the gasket receiving part is in a state of being accommodated in the container body. Further, even after the protective part (gasket receiving part) is removed by removing the cap or splitting, etc., the injection needle can still maintain a state of being accommodated in the container body because the gasket with a needle abuts against the inner peripheral surface of the container body. There is no concern about damaging the skin and the dermis before use, and the risk latent in the handling of the injection needle can be avoided. Furthermore, since the injection needle is in a state of being accommodated in the container body, the patient does not see the injection needle before, during, and after use, so that mental stress such as giving the patient a sense of fear can be reduced.

[0025] The syringe according to claim 1, wherein the gasket with a needle has an introduction path for guiding a chemical solution to the injection needle, and has a partition wall that becomes a contact surface with the chemical solution in the introduction path.

[0026] According to the present invention, an introduction passage is provided, and a needle-equipped gasket with a partition wall that serves as a contact surface with the drug solution is used to divide the introduction passage into an upstream side filled with the drug solution and a downstream side without the drug solution, thereby preventing the drug solution from easily flowing into the injection needle. The needle-equipped gasket moves just before inoculation, and this movement prevents the drug solution from being unnecessarily released from the injection needle before inoculation. By applying a predetermined pressure, the drug solution that breaks or penetrates the partition wall flows into the injection needle. However, if the viscosity of the drug solution to be ingested is high and the pressure loss when it flows out of the injection needle is large, this partition wall is unnecessary.

[0027] The syringe is characterized in that the partition wall has a mechanism for cutting or breaking through it.

[0028] According to the present invention, the degree to which the chemical solution breaks or penetrates the partition wall can be controlled by the partition wall having notches. The number, depth, and shape of the notches should be set according to the properties of the chemical solution (viscosity, etc.). Furthermore, the degree of breakage and penetration can also be controlled by having a mechanism for breakage and penetration in the partition wall.

[0029] The syringe is characterized in that the container body has an inner wall portion that is located above the one end and protrudes in the circumferential direction.

[0030] According to the present invention, since the container body has an inner wall portion that is located above one end and protrudes inward in the circumferential direction, the movable needle-equipped gasket cannot move below the inner wall portion, thus functioning as a stopper for the needle-equipped gasket. This restricts the range of motion of the needle-equipped gasket, and by appropriately designing the length of the injection needle, it is possible to prevent the injection needle from penetrating the skin excessively. In other words, the injection needle can be inserted to the appropriate depth for each type of injection, such as intradermal injection, subcutaneous injection, and intramuscular injection, and it is possible to select a syringe according to the application site, such as the injection site and depth.

[0031] A syringe having a gasket at its tip that contacts the inner circumferential surface of the container body, and a plunger positioned on the other end of the container body.

[0032] According to the present invention, the plunger is positioned on the other end of the container body, and the container body maintains a closed state at both ends with the plunger and protective body, thus blocking contact with the outside air, which is excellent for the hygienic management of the syringe. Furthermore, even when the plunger is pulled back, only the gasket remains inside the container body, preventing the drug solution from being reinjected into the syringe, thus preventing the reuse of the syringe.

[0033] A syringe characterized in that the gasket and the plunger are connected by a connecting body, the connecting body moves the gasket in response to the pressing operation of the plunger and detaches from the gasket in response to the pulling operation of the plunger.

[0034] According to the present invention, the gasket and the plunger are connected by a connecting body, and as the plunger is pressed, the connecting body moves the gasket, so that the plunger and gasket are pressed together via the connecting body and move to the bottom of the container body. On the other hand, as 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. As a result, it becomes impossible to refill the container body with liquid medicine, thus preventing the reuse of syringes and needles, which is excellent from a hygiene management perspective.

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

[0036] According to the present invention, the spring's restoring action pulls back the compressed plunger or needle-attached gasket, causing the needle-attached gasket to be drawn back into the container body either as the plunger moves or directly. At this time, the injection needle is also pulled back into the container body, preventing injury to the skin and subcutaneous tissue from the used injection needle, thus avoiding the dangers inherent in handling injection needles.

[0037] A syringe in which the container body is filled with liquid medicine.

[0038] According to the present invention, by filling the container body with the necessary drug solution (making it a completely virgin pre-filled container), problems such as selecting the wrong drug to inject or administering the wrong dosage can be avoided. Furthermore, it is preferable to clearly indicate which drug is filled and in what quantity. In addition, by making the structure such that the gasket detaches when the plunger is pulled out, it becomes impossible to arbitrarily replace the already filled drug solution, thereby preventing accidents and errors in medical settings and also contributing to the prevention of the reuse of syringes and needles.

[0039] A syringe characterized by having a storage compartment for storing an anesthetic drug at the rear end of the plunger.

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

[0041] The syringe of the present invention avoids and solves the problems inherent in conventional syringes (dangers in handling the injection needle, misidentification of the drug introduced into the syringe, and pain during use), and has the effect of providing a syringe that is superior in both hygiene management and selection of application sites. [Brief explanation of the drawing]

[0042] [Figure 1]This is an exploded view of a syringe according to an embodiment of the present invention. [Figure 2] This is an assembly diagram of a syringe according to an embodiment of the present invention. [Figure 3] This is a schematic diagram showing another example of a needle-type gasket. [Figure 4] This is a diagram illustrating the function of the protrusion. [Figure 5] This is an assembly diagram for a syringe using a plunger with a spring mechanism. [Figure 6] This is an exploded view of another syringe according to an embodiment of the present invention. [Figure 7] This is an assembly diagram of another syringe according to an embodiment of the present invention. [Figure 8] This is an exploded view of another syringe according to an embodiment of the present invention. [Figure 9] This is an assembly diagram of another syringe according to an embodiment of the present invention. [Figure 10] This is an exploded view of another syringe according to an embodiment of the present invention. [Figure 11] This is an assembly diagram of another syringe according to an embodiment of the present invention. [Figure 12] This is a diagram illustrating the storage compartment for anesthetic drugs. [Figure 13] This is a diagram illustrating how to use a syringe. [Figure 14] This is a diagram illustrating how to use a syringe. [Figure 15] This is a diagram illustrating how to use a syringe. [Best Mode for Carrying Out the Invention]

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

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

[0045] The syringe 1 is integrally formed with a hollow cylindrical container body 11 and a protective body 12 that closes the lower end (one end) of the container body 11. The container body 11 has a ring-shaped upper handle portion 11a on the upper side surface, a ring-shaped lower handle portion 11b on the side surface slightly above the center, two protrusions 11C1 and 11C2 on the lower end (one end), and a ring-shaped inner wall portion 11d that protrudes toward the center from the inner wall surface of the container body 11. Note that the number of protrusions is not limited to two. There may be one or more. Also, their shape is not particularly limited, such as a cylinder, prism, cone, or pyramid. When pressed firmly against the skin, it should have a sharpness (dullness) that does not damage the surface, and should cause a feeling of pressure and mild pain.

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

[0047] Furthermore, the container body 11 and the protective body 12 can be separated by applying a twisting or bending force to the knob portion 12a, which will damage the connecting portion 13. When integrally forming the container body 11 and the protective body 12, the lower end surface 11e of the container body 11 and the upper end surface 12d of the knob portion 12a of the protective body 12 are formed in relatively different orientations, and the connecting portion 13 is made thin, thereby reducing the force required for cleavage and minimizing the cleavage surface (connecting portion 13) resulting from the cleavage.

[0048] Furthermore, by using a material with cleavage properties, the separated cleavage surface (connecting part 13) becomes smooth, eliminating the risk of skin damage from the separated surface of the connecting part 13 when the tip of the syringe 1 is pressed against the skin before extending the needle. Therefore, when pressing the syringe 1 perpendicularly against the skin, the broken and separated connecting part 13 can be firmly pressed against the skin, maintaining its cross-section in contact with the skin surface, and consequently, the depth to which the injection needle 22 is inserted can be consistently defined. In other words, it becomes possible to specify the depth to which the injection needle 22 is inserted to a desired depth, such as for subcutaneous injection or intramuscular injection. Conversely, with a cut surface of the connecting part 13 that is highly irregular, the depth to which the injection needle 22 is inserted will not be consistent, and ideal injection will be impossible with a cut surface that damages the epidermis.

[0049] The material having cleavage properties is composed of known resin compositions with a number-average molecular weight of 1 × 10³ to 1 × 10⁶ obtained by polymerizing hydrogen, methyl, fluorine, etc. Materials with high crystallinity tend to produce fragments, and materials with high malleability and ductility such as PET tend to produce burrs and splinters without breaking. On the other hand, resin compositions can be expected to break cleanly while having appropriate hardness, and moreover, the generation of fragments can be prevented.

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

[0051] The upper ring portion 21a has an outer diameter approximately the same as the inner wall diameter of the container body 11, preventing the liquid medicine 5 filled in the container body 11 from flowing out downwards. The hollow portion of the upper ring portion 21a has an introduction passage 21d formed therein for guiding the liquid medicine 5 to the injection needle 22. This introduction passage 21d has a shape that tapers towards the downstream end. The hollow portions of the middle ring portion 21b and the lower ring portion 21c have injection needle holes 21e formed therein for inserting and securing the injection needle 22, into which the injection needle 22 is inserted. These introduction passages 21d and injection needle holes 21e are connected and integrally formed.

[0052] Furthermore, 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 liquid medicine 5 filled in the container body 11 from flowing out downwards. In addition, 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 also smaller than the inner wall diameter of the container body 11, thereby reducing the 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 similarly coaxial hollow cylindrical middle ring portion 31b, and a similarly 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 liquid medicine 5 filled in the container body 11 from flowing upward or downward when the syringe is inverted. The outer diameter of the lower ring portion 31c is also approximately the same as the inner wall diameter of the container body 11, and together with the upper ring portion 31a, prevents the liquid medicine 5 filled in the container body 11 from flowing upward or downward when the syringe is inverted. The outer diameter of the middle ring portion 31b is smaller than that of the upper ring portion 31a and the lower ring portion 31c, and is also smaller than the inner wall diameter of the container body 11, thereby reducing the 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 each have interconnected hollow portions 31d and 31e, respectively. The hollow portion 31d has a small diameter, while the hollow portion 31e has a large diameter region. This allows the connecting body 41c, which is inserted into the hollow portion, to move with some play in the large diameter region, enabling the gasket 3 to move downward in conjunction with the pressing operation of the plunger 4.

[0055] On the other hand, as the plunger 4 is pulled out, the connecting body 41c detaches from the gasket 3, thus separating the plunger 4 and the gasket 3. The detachment of the plunger 4 and the gasket 3 can be facilitated by the air hole 43 provided in the plunger 4, and the action of the air hole 43 requires a large force to pull out the plunger 4, thereby releasing the connection of the connecting body 41c. This basic operation is the same in syringes shown in Figure 5 and later.

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

[0057] Here, the fit between the gasket 3 and the plunger 4 is made weak, or even nonexistent, so that the plunger 4 can easily detach from the gasket 3, preventing the gasket 3 from moving inside the container body 11. This prevents the liquid chemical from being refilled between the needle-equipped gasket 2 and the gasket 3. Alternatively, the same effect can be achieved by making the connecting body 41c that links the gasket 3 and the plunger 4 easily detach from the gasket 3, preventing the gasket 3 from moving inside the container body 11.

[0058] Thus, a syringe consisting of a syringe barrel 1, a needle-equipped gasket 2, and a plunger 4 fitted with a gasket 3 is assembled and manufactured as follows, and then used. (1) Insert the needle-attached gasket 2 into the container body 11 of the syringe 1 from the upper end of the opening and bring it into contact with the gasket receiving portion 12b. At this time, the injection needle 22 is housed in the needle hole portion 12c. (2) With the container body 11 of the syringe 1 filled with a specified amount of liquid medicine 5, the plunger 4 fitted with the gasket 3 is attached. (3) When in use, applying force to the knob portion 12a causes the connecting portion 13 to break, separating the container body 11 from the protective body 12. As a result, the injection needle 22 is exposed to the outside air for the first time. (4) By pushing down the plunger 4 in such an operation that the relative distance between the handle portion 41a and the upper handle portion 11a is reduced, the pressure load of the drug solution 5 due to the movement of the gasket 3 pushes out the needle gasket 2, and the injection needle 22 is exposed from the syringe 1 and administered to the patient. The range of motion of the needle gasket 2 is restricted by the inner wall portion 11d acting as a stopper. (5) After vaccination, after confirming that the injection needle 22 has been withdrawn from the patient, the plunger 4 is pulled out, and the pressure inside the container body 11 due to the movement of the gasket 3 pushes up the gasket 2 with the needle attached, causing the injection needle 22 to enter the syringe 1. (6) When the plunger 4 is pulled out further, the connecting member that links the plunger 4 and the gasket 3 separates the plunger 4 and the gasket 3, allowing the plunger 4 to be pulled out of the container body 11, but the gasket 3 remains inside the container body 11.

[0059] Figure 3 is a schematic diagram showing another example of the needle-equipped gasket 2', where (A) is a cross-sectional view and (B) is a cross-sectional view of AA. For the sake of clarity, the injection needle 22 is omitted from the illustration. The needle-equipped gasket 2' may also be used in the second, third, and fourth syringes.

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

[0061] A U-shaped liquid repellent 23 is fitted into the upper ring portion 21a, in contact with the outer wall 23b, and the introduction passage 21d is divided vertically by the upper disc 23a. The upper disc 23a has symmetrical notches 23c formed at the center of the circle, which control the outflow of the liquid repellent from upstream to downstream within the introduction passage 21d. The upper disc 23a is made of soft rubber and has the role of preventing the liquid repellent 5 from passing through to the injection needle 22 until a certain amount of internal pressure is applied to the soft rubber membrane with the notches. This prevents a small amount of the liquid repellent 5 from being released before the tip of the injection needle 22 penetrates the skin when the gasket 3 moves forward, if the viscosity of the liquid repellent 5 it contains is low.

[0062] As shown in Figure 4, human skin is composed of the epidermis, dermis, and subcutaneous tissue from the outside in, with muscles and veins located in the subcutaneous tissue and even deeper. The pain felt when a needle is inserted into the skin is said to be because the needle hits pain receptors distributed on the skin surface, and it is estimated that there are 100 to 200 pain receptors per square centimeter. Therefore, it is thought that pain during injection can be reduced by using a very fine needle that avoids pain receptors as much as possible, and there are syringes that use such ultra-fine needles, but no matter how thin the needle is, pain will be felt if it touches a pain receptor, and when cells into which the needle has been inserted release "pain-inducing substances" such as potassium ions, serotonin, and acetylcholine, these reach the nerve endings of sensory nerves and cause pain. Therefore, the use of local anesthesia is considered as a reliable means of relieving pain. For example, the pain of a needle can be alleviated by applying a patch containing a local anesthetic containing lidocaine or by applying a cream.

[0063] On the other hand, it is said that humans cannot feel multiple pains simultaneously, and that if one experiences another pain while receiving an injection, it can mask the pain of the injection. Classic examples include pinching one's thigh, pinching the injection site, or digging one's fingernail into the injection site; by becoming accustomed to another pain, the pain of the injection can be reduced. It is also said that nerves that transmit pain are thin nerves, while nerves that transmit sensations such as touch and pressure are thicker nerves. Furthermore, there is a phenomenon in which thicker nerves suppress the function of thin nerves. It is well known that rubbing or pressing on an area can significantly relieve pain, and it is also a common experience that applying gauze and wrapping a bandage to an injury can alleviate the pain.

[0064] Figure 4 is a diagram illustrating the function of the projections. By pressing the two projections 11C1 and 11C2 against the skin to a degree that does not damage the epidermis and dermis (Figure 4(B)), pain is inflicted on the skin by the projections 11C1 and 11C2. During injection with the needle 22, a different type of pain is inflicted by the projections 11C1 and 11C2, allowing the patient to become accustomed to a different type of pain. The number of projections is not limited to two and can be increased depending on the degree of pain. It is also possible to attach a projection body with such projections to the flat lower end of a 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 damaging the epidermis or dermis, the area pressed in the ring shape can be made ischemic and paralyzed. As a result, the pain of the injection needle is almost completely eliminated by the stimulating pressure on the skin, reducing pain during injection.

[0066] Figure 5 is an assembly diagram of a syringe using a plunger 4 with a spring, where the spring 6 is positioned on the outer surface of the plunger body 41b. Figure 5(A) shows the state before use, where the spring 6 is extended. Figure 5(B) shows the state during use, where the spring 6 is compressed when the plunger 4 is pushed down to expose the injection needle 22 from the syringe barrel 1. Figure 5(C) shows the state after use, where the spring 6 is returning to its original shape and attempting to extend. The spring 6 is an elastic member that generates a restoring force in the exact opposite direction to the pressing direction, and is made of metal such as aluminum or stainless steel, or resin. With a syringe having such a spring 6, the gasket 3 moves automatically due to the restoring force without the operation of pulling up the plunger 4, and the resulting load pressure inside the container body 11 pushes up the needle gasket 2 as if being sucked in, so that the injection needle 22 enters the 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 Figure 5, regardless of the arrangement of the spring body 6.

[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-equipped gasket 2, and plunger 4 to which the gasket 3 is attached are the same as those in Figure 5. The shape of the gasket receiving portion 12b of the protective body 12 of the syringe barrel 1 is different, but this is for convenience when arranging the spring body 6 on the outer surface of the plunger receiving portion 12b.

[0069] With this syringe, since the spring body 6 is positioned at the bottom of the needle-attached gasket 2, a restoring force is generated in the spring body 6 as the needle-attached gasket 2 is pushed down during injection. Without having to pull up the plunger 4, the restoring force of the spring body 6 pushes the gasket 2 up after injection, and the injection needle 22 enters the syringe barrel 1.

[0070] (Third syringe) Figure 8 is an exploded view of another syringe according to an embodiment of the present invention, and Figure 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 Figure 5.

[0071] Unlike the syringe in Figure 5, the container body 11 of the syringe barrel 1 does not have ring-shaped upper and lower handles. The plunger 7, to which the gasket 3 is attached, has an outer wall portion 71a, a plunger body portion 71b which is spaced apart from the outer wall portion 71a with a predetermined gap, and a T-shaped connecting body 71c connected to the lower end of the plunger body portion 71b. A spring body 6 is disposed in the gap formed between the plunger body portion 71b and the outer wall portion 71a, with the upper end of the spring body 6 located on the upper surface of the outer wall portion 71a and the lower end of the spring body 6 located on the upper end surface of the opening of the container body 11.

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

[0073] (Fourth syringe) Figure 10 is an exploded view of another syringe according to an embodiment of the present invention, and Figure 11 is an assembled view of another syringe according to an embodiment of the present invention. The syringe with needle gasket 2 is the same as that of the syringe in Figure 5, the syringe barrel 1 is the same as that of the syringes in Figures 6 and 7, and the plunger 7 is the same as that of the syringes in Figures 8 and 9.

[0074] With this syringe, since the spring body 6 is positioned at the bottom of the needle-attached gasket 2, a restoring force is generated in the spring body 6 as the needle-attached gasket 2 is pushed down during injection. Without having to pull up the plunger 4, the restoring force of the spring body 6 pushes the gasket 2 up after injection, and the injection needle 22 enters the syringe barrel 1.

[0075] (Anesthetic drug storage compartment) Figure 12 is a diagram illustrating the storage compartments 42 and 72 for storing the anesthetic 8. Box-shaped storage compartments 42 and 72 are 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 compartment 42 and 72 and applied to the skin to provide surface anesthesia. The anesthetic 8 may also be in patch or cream form, and is removed from the storage compartment 42 and 72 and applied or spread. Note that even if separate storage compartments 42 and 72 are not provided, the rear end surfaces of the plungers 4 and 7 may function as storage compartments 42 and 72, for example, by adhering the bottom surface of a sealed container to the rear end surfaces of the plungers 4 and 7 with double-sided tape.

[0076] (How to use a syringe) Figures 13 to 15 will be used to explain how to use a syringe. (A) Figures 13(A) and 14(A) show the condition before use. (B) Figures 13(A) and 14(A) show the protective body 12 removed. From (A) to (B), a storage compartment 42 for storing anesthetic 8 is provided at the tip of the handle of the plunger 4. Immediately before using the syringe, a hole is made in the storage compartment 42 and the anesthetic 8 is applied to the area where the injection needle 22 will strike. Figure 15(A) shows this process, and by anesthetizing the free nerve endings present in the epidermis and dermis, surface anesthesia is achieved, reducing needle pain.

[0077] (C) Figures 13(C) and 14(C) show the plunger 4 pushed in, exposing the injection needle 22. 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 located at the tip to penetrate shallowly into the skin, giving the brain the sensation of being pricked by a protrusion. Also, in the stage of gradually inserting the needle in (C), the injection needle 22 is inserted into the skin while the patient is under the illusion that they are being pricked by a protrusion and are experiencing pain.

[0078] (D) Figures 13(D) and 14(D) show the state in which drug solution 5 is injected into the subcutaneous tissue. Figure 15(B) shows the procedure, in which drug solution 5 is injected into the subcutaneous tissue (approximately 2.3 mm below the skin surface), which is located below the epidermis (approximately 0.2-0.3 mm) and dermis (approximately 2 mm).

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

[0080] (F) Figures 13(F) and 14(F) show the plunger 4 removed from the syringe 1. From (E) to (F), the needle-equipped gasket 2, which has the injection needle 22, is pulled back by the restoring force of the spring 6 and stored inside the main container 11. Furthermore, if the plunger 4 is pulled upward forcefully, the connection between the plunger 4 and the needle gasket 3 will be detached, and the needle gasket 3 will remain inside the syringe 1. In state (F), the syringe cannot be reused by reinjecting the drug solution between gasket 4 and needle-equipped gasket 3. [Industrial applicability]

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

[0082] 1: Syringe barrel 2,2': Gasket with needle 3: Gasket (31a: Upper ring section, 31b: Middle ring section, 31c: Lower ring section, 31d, 31e: Hollow section) 4: Plunger (41a: Handle part 41b: Plunger body part 41c: Connecting part) 5: Medicinal solution 6: Spring body 7: Plunger (71a: Outer wall section, 71b: Plunger body section, 71c: Connecting section) 8: Anesthetics 11: Container body (11a: Upper handle, 11b: Lower handle, 11C1, 11C2: Protrusions, 11d: Inner wall) 12: Protective body (12a: Knob part 12b: Gasket receiving part 12c: Pinhole part) 13:Connection part 21: Gasket (21a: Upper ring section, 21b: Middle ring section, 21c: Lower ring section) 21d:Introduction path 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, One end of the container body is closed, and a protective body is connected to the inside and outside of the container body, It has, The protective body has a needle hole portion for protecting the injection needle placed inside the container body, 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. A syringe having a connecting portion that connects the tip portion and the gasket receiving portion to the container body, A syringe characterized in that, by applying force to the tip, the connecting part breaks, and the container body and the protective body can be separated.

2. The syringe according to claim 1, characterized in that the tip of one end of the container body has a projection that protrudes from the tip surface.

3. The syringe according to claim 1, characterized in that the bottom surface of the needle hole is located on the drug-containing side along the axial direction of the container body, more so than the front surface of the container body.

4. The syringe according to claim 1, characterized in that a needle-equipped gasket having a fixedly positioned injection needle is arranged in the gasket receiving portion and contacts the inner circumferential surface of the container body.

5. The aforementioned needle-equipped gasket has an introduction channel for guiding the drug solution to the injection needle. The syringe according to claim 4, characterized in that it has a partition wall in the introduction passage that serves as a contact surface with the drug solution.

6. The syringe according to claim 5, characterized in that the partition wall has a mechanism for cutting or breaking through it.

7. The syringe according to any one of claims 1 to 6, characterized in that the container body has an inner wall portion that protrudes circumferentially and is located on the drug-containing side along the axial direction of the container body, more so than the inner circumferential surface on the one end side.

8. A syringe according to any one of claims 1 to 6, having a gasket at its tip that contacts the inner circumferential surface of the container body, and a plunger disposed on the other end side of the container body.

9. The gasket and the plunger are connected by a connecting body. The connecting body moves the gasket in accordance with the pressing operation of the plunger, The syringe according to claim 8, characterized in that the plunger detaches from the gasket when the plunger is pulled out.

10. The syringe according to claim 9, characterized in that the plunger has a spring body that returns to its original position in the exact opposite direction to the direction of pressure.

11. The syringe according to claim 1, wherein the container body is filled with a drug solution.

12. The syringe according to claim 9, characterized in that a storage compartment for storing an anesthetic is provided at the rear end of the plunger.

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