JPWO2019235637A1 - Syringe with movable needle and camouflaged pain point needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a syringe which is excellent in handling an injection needle and can eliminate anxiety about danger and hygiene before and after use, and can eliminate anxiety about invasion by an injection needle even during use. SOLUTION: A syringe composed of an injection cylinder 1, a gasket 2 with a needle, and a plunger 4 to which the gasket 3 is attached. In the syringe barrel 1, the container body 11 and the protective body 12 are integrally formed, and the protective body 12 is separated from the connecting portion 13 by cleavage and used. The injection needle 22 is housed in the container body 11, and the injection needle 22 is exposed to the outside of the container body 11 and inoculated into the skin by operating the plunger 4 at the time of use. At this time, the two protrusions 11C1 and 11C2 at the tip of the container body 11 abut on the skin and press the skin to the extent that they do not attack the epidermis and the dermis, thereby giving pain different from the pain caused by the injection needle 22. Disguise the pain and reduce the pain of the injection needle 22. After use, the gasket 2 with a needle is returned to the inside of the container body 11 to accommodate the injection needle.

Description

The present invention relates to a syringe having an injection needle, one in which the injection needle is movably exposed and pulled back, and one having a camouflaged pain point needle different from the injection needle.

Currently, there are various routes of administration of medicines in medical treatment, and the oral route and the injection route are typical examples of widely used ones.

The oral route is the most widely used in routine drug administration. If you do not make a mistake in selecting and dispensing a drug, and if you do not make a mistake in the timing of ingestion, you will not make a big mistake, and it can be said that it is a convenient, easy and safe administration method compared to the injection route. Therefore, the current situation is that oral administration of medicines is entrusted to each patient in home treatment. Dosage forms used include tablets, capsules, powders and the like.

However, in oral administration, the drug is absorbed in the digestive organs such as the stomach and small intestine, so this drug may cause gastrointestinal disorders or the drug may be decomposed by gastric acid or the like in the digestive tract (especially the stomach). .. In addition, it takes some time for the effect to appear after absorption, and there is a problem that the effect becomes unstable. Furthermore, there is a problem that the absorption of the drug differs depending on the state of the digestive tract.

On the other hand, in the case of a drug that is not decomposed in the digestive tract or the like or is not absorbed in the digestive tract or the like, the injection route can be said to be particularly effective. Specifically, there are several routes of administration such as intravenous, intramuscular, subcutaneous, and intradermal, and the pharmacokinetics of the drug can be controlled by appropriately selecting these routes.

That is, by injecting a drug directly into the body using an injection needle, the onset of the effect is quick and stable. Since the injection route allows the drug to be directly administered to the required area (affected area), it takes less time for the drug to start to be effective than other administration methods, and it is filtered during the absorption process or becomes another substance. It can be said that it is a more reliable method because it can be administered even if it is altered or decomposed by detoxification in the process of absorption.

As described above, the administration method by the injection route has advantages over the oral route. Due to its efficacy, self-injection is permitted even in countries (such as Japan) that limit injection as a medical practice by doctors. Examples of its use include insulin injection for the treatment of diabetes, heparin injection for the prevention of infertility, and self-injection of a blood coagulation factor drug for the treatment of hemophilia.

Japanese Patent Application Laid-Open No.

However, it cannot be said that injections are sufficiently widespread and utilized. The following problems 1 to 5 are inherent in it.
1. 1. Dangers hidden in the handling of injection needles (needle stick accidents, etc.)
2. Dangers hidden in the use of medicines (wrong selection of medicines and introduction amount)
3. 3. Hygiene management of syringes (storage accidents and reuse)
4. Dangers hidden in injection (depth of injection)
5. Pain when using a syringe (good / bad injection, drug irritation)

Needleless syringes without needles have been considered to solve some of the above problems, but they are expensive, the impact noise when ejecting the drug solution is too loud, and secondary infection due to the reuse of expensive injectors. It has not been popularized for some reason.

On the other hand, syringes with needles are the most widespread, and their basic structure has not changed over the years. It can be said that it is simple and inexpensive. On the other hand, since the hollow needle penetrates into the living tissue, the feeling of refusal to invade and the substantial damage are still a problem. In addition, existing syringes are still problematic because they are not completely virgin and infectious disease control.

The present invention has been made in view of these points, and an object of the present invention is to be excellent in handling the injection needle, to eliminate dangers before and after use and anxiety about hygiene, and to be anxious about invasion by the injection needle even during use. Is to provide a syringe that can be wiped out.

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

(1) It has a hollow cylindrical container body and a protective body that closes one end side of the container body and is connected to the inside and outside of the container body, and the protective body is an injection arranged in the container body. A syringe characterized in that a needle hole portion for protecting the needle is formed.

According to the present invention, the syringe has a protective body that closes one end side of the container body, is formed in a row inside and outside the container body, and has a needle hole portion that protects the injection needle. The injection needle is housed in the needle hole in the main body and protected. Since the injection needle is housed in the container body by the protective body and one end is closed, the injection needle is not exposed to the outside air until the actual use, and the syringe and the injection needle are stored for hygiene. Excellent in terms of management.

As the protective body, a configuration that is integrally formed with the container body so that it can be easily separated, a configuration that is attached separately from the container body (for example, a cap), or the like can be adopted. The needle hole is formed in the container body so that the injection needle is housed in the container body and the injection needle is not exposed to the outside of the container body even if it is separated from the protective body.

(2) A syringe characterized in that a protrusion on one end side of the container body is formed with a protrusion protruding from the tip surface.

According to the present invention, when the tip surface is brought into contact with the skin for inoculation, the protrusions press the skin to give pain different from the pain of needle stick, making it difficult to feel the original pain of injection. be able to. This protrusion functions as a so-called camouflaged pain point needle, disguising the pain as if another needle is stabbed around the injection needle. As a result, it is possible to solve the problem of pain generation during use, such as the skill of giving a less painful injection (which requires skill) and the extra pain increases if the person is not good at it.

(3) A syringe characterized in that the bottom surface of the needle hole portion is located above the tip surface of the container body.

According to the present invention, since the bottom surface of the needle hole portion is located above the tip surface of the container body, it is possible to maintain the state in which the injection needle is housed in the container body before use. There is no concern that the skin and the inside of the skin will be injured before, and the danger lurking in the handling of the injection needle can be avoided.

(4) The protective body has a tip portion protruding from the tip surface of the container body and a gasket receiving portion on which the needle hole portion is formed, and the tip portion, the gasket receiving portion, and the container body. It is a syringe in which a connecting portion for connecting the two is formed, and when a force is applied to the tip portion, the connecting portion is damaged and the container body and the protective body can be separated from each other. Syringe.

According to the present invention, by applying a force to the tip portion by rotating or folding around the central axis, the connecting portion is damaged, and the container body and the protective body (tip portion and gasket receiving portion) are separated by injection. Since it is possible, 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 hygiene management. Further, by utilizing the cleavage property of the material to be used, the cross section thereof can form a flat cross section without unevenness. As a result, even if the connecting portion (cut surface) is strongly pressed against the skin, safety can be ensured without damaging the skin at the cut surface.

(5) A syringe characterized in that the gasket receiving portion has an injection needle that is positioned and fixed, and a gasket with a needle that abuts on the inner peripheral surface of the container body is arranged.

According to the present invention, since the gasket with a needle is arranged in the gasket receiving portion, the gasket with a needle supported by the gasket receiving portion is housed in the container body. Moreover, even after the protective part (gasket receiving part) is removed by removing the cap or opening the opening, the gasket with the needle is in contact with the inner peripheral surface of the container body, so that the injection needle is still housed in the container body. It is possible to maintain the condition, and there is no concern of damaging the skin and the inside of the skin before use, and it is possible to avoid the danger lurking in the handling of the injection needle. Furthermore, since the injection needle is housed in the container body, the patient does not see the injection needle before, after, and during use, which reduces mental stress such as giving the patient a feeling of fear. Can be done.

(6) The syringe with a needle has an introduction path for guiding the drug solution to the injection needle, and has a partition wall in the introduction path as a contact surface with the drug solution.

According to the present invention, an upstream side in which the chemical solution is filled and a downstream side in which the chemical solution is not provided by a gasket with a needle having an introduction path and a partition wall serving as a contact surface with the chemical solution in the introduction path. It can be partitioned into and to prevent the drug solution from easily flowing into the injection needle. The gasket with a needle moves immediately before inoculation, but this movement is to prevent the drug solution from being unnecessarily released from the injection needle before inoculation, and the drug solution that destroys or penetrates the partition wall by applying a predetermined pressure. Is flowing into the injection needle. If the viscosity of the drug solution to be ingested is high and the pressure loss when flowing out of the injection needle is large, this partition wall becomes unnecessary.

(7) A syringe characterized in that the partition wall has a mechanism for cutting or breaking through the partition wall.

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 the notch. The number, depth, shape, etc. of the cuts may be set according to the properties (viscosity, etc.) of the chemical solution. Further, by having a mechanism for breaking and penetrating in the partition wall, the degree of breaking and penetrating can be controlled.

(8) The syringe body is characterized by having an inner wall portion that is located above the one end side and protrudes in the inner peripheral direction.

According to the present invention, since the gasket having an inner wall portion that is located above one end side of the container body and protrudes in the inner peripheral direction, the movable gasket with a needle cannot move below the inner wall portion, and the needle. It functions as a stopper for the gasket with attachment. Thereby, by restricting the movable range of the gasket with a needle and appropriately designing the length of the injection needle, it is possible to prevent the injection needle from penetrating the skin excessively. That is, the injection needle can be inserted into an appropriate depth for each of intradermal injection, subcutaneous injection, intramuscular injection, etc., which can contribute to the selection of a syringe according to the application site such as the injection location and depth.

(9) A syringe having a gasket at the tip that contacts the inner peripheral surface of the container body and a plunger that is arranged on the other end side of the container body.

According to the present invention, the plunger is arranged on the other end side of the container body, and the container body keeps both ends closed by the plunger and the protective body to block contact with the outside air. , Excellent in hygiene management of syringes. Further, even if the plunger is pulled back, only the gasket remains in the container body, so that the drug solution cannot be reinjected into the syringe, and the syringe can be prevented from being reused.

(10) The gasket and the plunger are connected by a connecting body, and the connecting body moves the gasket according to a pressing operation of the plunger, and is separated from the gasket by a pulling operation of the plunger. A syringe characterized by that.

According to the present invention, the gasket and the plunger are connected by a connecting body, and since the connecting body moves the gasket according to the pressing operation of the plunger, the plunger and the gasket are pressed through the connecting body. Move to the bottom of the container body. On the other hand, since the plunger is separated from the gasket when the plunger is pulled out, the plunger and the gasket are separated, and only the plunger is pulled out of the container body, and the gasket stays in the container body. As a result, it becomes impossible to refill the container body with the chemical solution, so that it is possible to prevent the syringe and the injection needle from being reused, which is excellent in hygiene management.

(11) The plunger is a syringe characterized by having a spring body that restores in the direction opposite to the pressing direction.
(12) A syringe characterized by having a spring body between the gasket with a needle and the inner wall portion that restores the gasket in the direction opposite to the pressing direction of the gasket with a needle.

According to the present invention, since the plunger or the gasket with a needle pressed by the restoring action of the spring body is pulled back, the gasket with a needle is also sucked as the plunger moves or directly, and is pulled back into the container body. Will be. At this time, since the injection needle is also pulled back into the container body, the injection needle after use does not damage the skin and the inside of the skin, and the danger of lurking in the handling of the injection needle can be avoided.

(13) A syringe in which the container body is filled with a chemical solution.

According to the present invention, by filling the container body with the necessary chemical solution (completely virgin type prefilled), it is possible to avoid problems such as an error in the selection of the drug to be injected and an error in the inoculation amount. Furthermore, it is preferable to clarify the indication of which drug is filled in what amount. In addition, by making the structure that can be removed from the gasket when the plunger is pulled out, it becomes impossible to replace the already filled chemical solution without permission, preventing accidents and mistakes in the medical field and reusing the syringe and needle. It can also contribute to the prevention of.

(14) A syringe characterized in that a storage portion for storing an anesthetic is provided at the rear end of the plunger.

According to the present invention, since the storage portion for storing the anesthetic is provided at the rear end of the plunger, the anesthetic can be applied or attached to the skin before inoculation to relieve the pain at the time of inoculation.

The syringe of the present invention avoids and solves the problems inherent in conventional syringes (dangers hidden in the handling of injection needles, mistakes in medicines to be introduced into syringes, and pain during use), and is also applicable to hygiene management. There is also an effect that an excellent syringe can be provided for the selection of.

It is an exploded view of the syringe which concerns on embodiment of this invention. It is an assembly drawing of the syringe which concerns on embodiment of this invention. It is the schematic which shows the other example of the gasket with a needle. It is a figure for demonstrating the action of the protrusion. It is an assembly drawing of a syringe using a plunger with a spring body. It is an exploded view of another syringe which concerns on embodiment of this invention. It is an assembly drawing of another syringe which concerns on embodiment of this invention. It is an exploded view of another syringe which concerns on embodiment of this invention. It is an assembly drawing of another syringe which concerns on embodiment of this invention. It is an exploded view of another syringe which concerns on embodiment of this invention. It is an assembly drawing of another syringe which concerns on embodiment of this invention. It is a figure for demonstrating the storage part which stores an anesthetic. It is a figure for demonstrating how to use a syringe. It is a figure for demonstrating how to use a syringe. It is a figure for demonstrating how to use a syringe.

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

(First syringe and basic configuration of syringe)
FIG. 1A is an exploded view of the syringe according to the embodiment of the present invention, FIG. 1B is a view of the plunger 4 from above, and FIG. 2 is a view according to the embodiment of the present invention. It is an assembly drawing of a syringe. In FIGS. 1 and 2, the syringe is composed of a syringe cylinder 1, a gasket 2 with a needle, and a plunger 4 to which the gasket 3 is attached.

The syringe barrel 1 is integrally formed with a hollow cylindrical container body 11 and a protective body 12 that closes the lower end side (one end side) of the container body 11. The container body 11 has a ring-shaped upper handle portion 11a on the upper end side side surface, a ring-shaped lower handle portion 11b on the center slightly upper end side side surface, and two protrusions 11 _C1 and 11 _{C2 on the lower end side (one end side).} And a ring-shaped inner wall portion 11d protruding from the inner wall surface of the container body 11 in the central direction are formed. The number of protrusions is not limited to two. It may be one or a plurality. Further, the shape thereof is not particularly limited, such as a cylinder, a prism, a cone, or a pyramid. When pressed strongly against the epidermis, it shall feel oppressive and mild pain with a sharpness (dullness) that does not damage the surface.

Further, the protective body 12 integrally formed with the container body 11 is formed with a knob portion 12a, a gasket receiving portion 12b, and a needle hole portion 12c formed in the gasket receiving portion 12b. Further, a ring-shaped connecting portion 13 for connecting the container body 11 and the protective body 12 is formed. When the protective body 12 is a cap type, the lower end (one end) of the container main body 11 functions as a connecting portion 13, and the connection by the connecting portion 13 is released by rotating the cap, and the container main body 11 and the protective body 12 are released. And can be separated.

Further, the container body 11 and the protective body 12 can be separated from each other because the connecting portion 13 is damaged by applying a force such as twisting or folding to the knob portion 12a. When the container body 11 and the protective body 12 are integrally formed, 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 directions, and the connecting portion 13 is formed. By forming the material thinly, the force required for cleavage can be reduced, and the cleavage surface (connecting portion 13) generated by cleavage can be reduced.

Further, by using a material having a cleavage property, the separated cleavage surface (connecting portion 13) has no unevenness, and when the tip of the syringe 1 is pressed against the skin before the injection needle is ejected, the connecting portion is formed. The 13 separate surfaces eliminate the risk of skin damage. Therefore, when the syringe 1 is pressed vertically against the skin, the broken and separated connecting portion 13 can be firmly pressed against the skin to maintain its cross section in contact with the skin surface, and thus the injection needle 22. The depth of insertion can be specified to be constant. That is, it is possible to specify the depth at which the injection needle 22 is inserted, such as subcutaneous injection and intramuscular injection, to a desired depth. On the contrary, the depth into which the injection needle 22 is inserted is not constant on the cut surface having the connecting portion 13 having severe irregularities, and ideal injection is impossible on the cut surface that damages the epidermis.

The material having cleavability is composed of a known resin composition having ^{a number average molecular weight of 1 × 10 3} to 1 × 10 ⁶ obtained by polymerizing hydrogen, methyl, fluorine or the like. A material with high crystallinity tends to cause broken pieces, and a material with high malleability and ductility such as PET has a problem that it does not break and easily causes burrs and hangnail. , Clean damage can be expected, and it is possible to prevent the occurrence of broken pieces.

The gasket 2 with a needle 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.

The outer peripheral diameter of the upper ring portion 21a is substantially the same as the inner wall diameter of the container body 11, and prevents the chemical solution 5 filled in the container body 11 from flowing downward. Further, the hollow portion of the upper ring portion 21a is formed with an introduction path 21d for guiding the chemical solution 5 to the injection needle 22. The introduction path 21d has a shape in which the tip is tapered toward the downstream side. An injection needle hole 21e for inserting and fixing the injection needle 22 is formed in the hollow portion 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 communicated with each other and integrally formed.

The outer peripheral diameter of the lower ring 21c is substantially the same as the inner wall diameter of the container body 11, and together with the upper ring portion 21a, prevents the chemical solution 5 filled in the container body 11 from flowing downward. There is. Further, the outer peripheral diameter of the middle ring portion 21b is smaller than that of the upper ring portion 21a and the lower ring portion 21c and smaller than the inner wall diameter of the container body 11, thereby reducing the sliding friction caused by the movement of the gasket 2 with a needle. There is.

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 peripheral diameter of the upper ring portion 31a is substantially the same as the inner wall diameter of the container body 11, and the chemical solution 5 filled in the container body 11 flows upward or downwards when the syringe is turned upside down. Is prevented from leaking. Further, the outer peripheral diameter of the lower ring 31c is substantially the same as the inner wall diameter of the container body 11, and together with the upper ring portion 31a, the chemical solution 5 filled in the container body 11 may flow upward or the syringe may be inserted. It prevents the chemical solution 5 from flowing downward when it is turned upside down. The outer peripheral diameter of the middle ring portion 31b is smaller than that of the upper ring portion 31a and the lower ring portion 31c, and smaller than the inner wall diameter of the container body 11, thereby reducing the sliding friction caused by the movement of the gasket 3.

Hollow portions 31d and 31e that communicate with each other are integrally formed in the upper ring portion 31a and the middle ring portion 31b of the gasket 3, the hollow portion 31d has a small diameter, and the hollow portion 31e has a large diameter region. That is, the connecting body 41c inserted into the hollow portion can be made movable with play in the large diameter region, and the gasket 3 can be moved downward by the pressing operation of the plunger 4.

On the other hand, since the connecting body 41c is separated from the gasket 3 as the plunger 4 is pulled out, the plunger 4 and the gasket 3 are separated from each other. The disconnection of the plunger 4 and the gasket 3 can be promoted by the air hole 43 provided in the plunger 4, and the action of the air hole 43 requires a large force for the pull-out operation of the plunger 4 to connect the connecting body 41c. To cancel. Such a basic operation is the same for the syringes shown in FIGS. 5 and 5 and thereafter.

The plunger 4 is integrally formed with a disk-shaped handle portion 41a and a cylindrical or columnar plunger main body portion 41b, and a connecting body 41c having a T-shaped cross section is formed at the lower end of the plunger main body portion 41b. Is connected. The connecting body 41c is inserted into the upper ring portion 31a and the middle ring portion 31b of the gasket 3.

Here, the fitting between the gasket 3 and the plunger 4 is weak or not fitted, and the plunger 4 is easily separated from the gasket 3, and the gasket 3 left in the container body 11 is movable. Make it impossible. This prevents the chemical solution from being refilled between the gasket 2 with a needle and the gasket 3. Alternatively, the same applies even if the connecting body 41c connecting the gasket 3 and the plunger 4 is easily separated from the gasket 3 so that the gasket 3 left behind in the container body 11 cannot be moved.

As described above, the syringe composed of the syringe barrel 1, the gasket 2 with a needle, and the plunger 4 to which the gasket 3 is attached is used after being assembled and manufactured as follows.
(1) The gasket 2 with a needle is inserted into the container body 11 of the syringe barrel 1 from the upper end of the opening and comes into contact with the gasket receiving portion 12b. At this time, the injection needle 22 is housed in the needle hole portion 12c.
(2) The plunger 4 to which the gasket 3 is attached is attached with the container body 11 of the syringe barrel 1 filled with the specified amount of the chemical solution 5.
(3) At the time of use, by applying a force to the knob portion 12a, the connecting portion 13 is damaged and the container body 11 and the protective body 12 are separated. As a result, the injection needle 22 comes into contact with the outside air for the first time.
(4) By pushing down the plunger 4 so as to shorten the relative distance between the handle portion 41a and the upper handle portion 11a, the gasket 2 with a needle is released by the load pressure of the chemical solution 5 accompanying the movement of the gasket 3. It is pushed out, the needle 22 is exposed from the syringe barrel 1, and the patient is inoculated. The movable range of the gasket 2 with a needle is restricted by using the inner wall portion 11d as a stopper.
(5) After inoculation, it is confirmed that the injection needle 22 has been pulled out from the patient, and the plunger 4 is pulled out. Is pushed up, and the injection needle 22 enters the syringe barrel 1.
(6) When the plunger 4 is further pulled out, the plunger 4 and the gasket 3 are separated by the action of the connecting body connecting the plunger 4 and the gasket 3, and the plunger 4 is removed from the container body 11. Although it can be pulled out, the gasket 3 remains in the container body 11.

3A and 3B are schematic views showing another example of the gasket with a needle 2', in which FIG. 3A is a cross-sectional view and FIG. 3B is a cross-sectional view taken along the line AA. For convenience of explanation, the injection needle 22 is not shown. Further, the gasket 2'with a needle may also be used in the second, third and fourth syringes.

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

A drug solution retainer 23 having a U-shaped cross section is fitted into the upper ring portion 21a in contact with the outer peripheral wall 23b, and the introduction path 21d is vertically partitioned by the upper surface disk 23a. The upper surface disk 23a has a symmetrical cut line 23c formed in the center of the circle, and controls the outflow of the chemical solution from the upstream to the downstream in the introduction path 21d. The upper surface disk 23a is made of soft rubber and has a role of not passing the chemical solution 5 to the injection needle 22 until a certain amount of internal pressure is applied to the soft rubber film having a notch. This prevents that when the gasket 3 advances, if the viscosity of the contained chemical solution 5 is low, the chemical solution 5 may be released in a small amount before the needle tip of the injection needle 22 pierces the skin.

As shown in FIG. 4, human skin is composed of epidermis, dermis, and subcutaneous tissue from the outside, and muscles and veins are located in the subcutaneous tissue and further behind it. It is said that the reason why the injection needle sticks into the skin and feels pain is that the injection needle hits the pain points distributed on the skin surface, and it is said that 100 to 200 ^{pain points are distributed per 1 cm 2.} Therefore, we think that it is possible to relieve the pain at the time of inoculation by using a fine needle that avoids pain points as much as possible, and there are syringes that use such a fine needle, but no matter how thin it is, it will be a pain point. If you touch it, you will feel pain, and when a "pain-causing substance" such as potassium ion, serotonin, or acetylcholine is released from the cell where the needle is stuck, it will reach the end of the sensory nerve and you will feel pain. Therefore, the use of local anesthesia is considered as a reliable means of relieving pain. For example, the pain of the injection needle can be relieved by applying a patch containing a local anesthetic containing lidocaine or applying a cream or the like.

On the other hand, it is said that humans cannot feel multiple pains at the same time, and if there is another pain while being injected, it is said that the pain of the injection can be disguised. Classic examples include pinching the thighs, pinching the inoculation site, or raising the nails at the inoculation site, and getting used to another pain can reduce the pain during inoculation. .. In addition, it is said that the nerves that convey pain are thin nerves, and the nerves that convey tactile and pressure sensations are transmitted by thick nerves. And there is a phenomenon that thick nerves suppress the function of thin nerves. It is well known that rubbing or pressing can relieve pain considerably, and even if you get injured and hurt, gauze and bandages will relieve the pain. be.

FIG. 4 is a diagram for explaining the action of the protrusion. By abutting the two protrusions 11 _C1 and 11 _C2 on the skin and pressing them to the extent that they do not attack the epidermis and dermis (FIG. 4 (B)), the _{pain caused by the protrusions 11 C1} and 11 _C2 is given to the skin. There is. During inoculation with the injection needle 22, _{another pain is given by the protrusions 11 C1} and 11 _C2 to acclimatize to the other 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 a protrusion to the lower end of a flat syringe for use.

By increasing the number of protrusions to form intermittent or continuous ring-shaped protrusions and pressing them to the extent that they abut on the skin and do not attack the epidermis and dermis, the ring-shaped pressed portion is pressed. It can be in an ischemic state and paralyzed. As a result, the pain of the injection needle is almost not felt due to the irritation pressure on the skin, and the pain at the time of inoculation can be reduced.

FIG. 5 is an assembly drawing of a syringe using the plunger 4 with a spring body, and the spring body 6 is arranged on the outer peripheral surface of the plunger main body 41b. FIG. 5A is a diagram showing a state before use, and the spring body 6 is extended. FIG. 5B is a diagram showing a state of being used, and the spring body 6 is contracted in a state where the injection needle 22 is exposed from the syringe barrel 1 by pushing down the plunger 4. FIG. 5C is a diagram showing a state after use, and the spring body 6 is about to be restored and stretched. The spring body 6 is an elastic member that generates a restoring force opposite to the pressing direction, and is made of a metal or resin such as aluminum or stainless steel. With such a syringe having a spring body 6, the gasket 3 is automatically moved by a restoring force without pulling up the plunger 4, and the gasket 2 with a needle is sucked by the load pressure in the container body 11 accompanying it. The injection needle 22 enters the syringe barrel 1 as it is pushed up.

Further, also in the second, third, and fourth syringes, the basic operation using the spring body 6 is the same as that shown in FIG. 5, regardless of the arrangement of the spring body 6.

(Second syringe)
FIG. 6 is an exploded view of another syringe according to the embodiment of the present invention, and FIG. 7 is an assembly view of another syringe according to the embodiment of the present invention. The syringe shown in FIG. 5 is similar to the syringe cylinder 1, the gasket 2 with a needle, and the plunger 4 to which the gasket 3 is attached. The shape of the gasket receiving portion 12b of the protective body 12 of the syringe barrel 1 is different, but this is due to the convenience of arranging the spring body 6 on the outer peripheral surface of the plunger receiving portion 12b.

According to this syringe, since the spring body 6 is arranged under the needle-attached gasket 2, a restoring force is generated in the spring body 6 as the needle-attached gasket 2 is pushed down at the time of injecting, and the plunger 4 is moved. After inoculation, the gasket 2 is pushed up by the restoring force of the spring body 6 without pulling up, and the injection needle 22 enters the syringe barrel 1.

(Third syringe)
FIG. 8 is an exploded view of another syringe according to the embodiment of the present invention, and FIG. 9 is an assembly view of another syringe according to the embodiment of the present invention. The basic configuration of the gasket 2 with a needle is the same as that of the syringe shown in FIG.

Unlike the syringe of FIG. 5, the container body 11 of the syringe barrel 1 does not have a ring-shaped upper and lower handles. Further, the plunger 7 to which the gasket 3 is mounted is located on the outer wall portion 71a, the plunger main body 71b which is interlocked with the outer wall 71a and is spaced apart from each other with a predetermined gap, and the lower end of the plunger main body 71b. A connecting body 71c having a T-shaped cross section is connected. The spring body 6 is arranged in the gap formed between the plunger main body 71b and the outer wall 71a, the upper end of the spring body 6 is on the upper surface of the outer wall 71a, and the lower end of the spring body 6 is on the opening of the container body 11. It is located on the end face.

According to this syringe, the gasket 3 is automatically moved by the restoring force of the spring body 6 without pulling up the plunger 7, and the gasket 2 with a needle is pushed up by the load pressure in the container body 11 accompanying the movement. Then, the injection needle 22 enters the syringe barrel 1.

(4th syringe)
FIG. 10 is an exploded view of another syringe according to the embodiment of the present invention, and FIG. 11 is an assembly view of another syringe according to the embodiment of the present invention. The gasket 2 with a needle is the same as the syringe of FIG. 5, the configuration of the syringe barrel 1 is the same as that of the syringes of FIGS. 6 and 7, and the configuration of the plunger 7 is the same as that of the syringe of FIGS. 8 and 9. Is similar.

According to this syringe, since the spring body 6 is arranged under the needle-attached gasket 2, a restoring force is generated in the spring body 6 as the needle-attached gasket 2 is pushed down at the time of injecting, and the plunger 4 is moved. After inoculation, the gasket 2 is pushed up by the restoring force of the spring body 6 without pulling up, and the injection needle 22 enters the syringe barrel 1.

(Anesthetic storage)
FIG. 12 is a diagram for explaining the storage portions 42 and 72 for storing the anesthetic agent 8, and is an outer wall portion located at the upper portion of the handle portion 41a located at the rear end of the plunger 4 or at the rear end of the plunger 7. Box-shaped storage portions 42 and 72 are provided above the 71a. The anesthetic 8 is enclosed in a sealed container, and at the time of use, the container is taken out from the storage portions 42 and 72 and applied to the skin for surface anesthesia. Further, the anesthetic 8 may be a patch type or a cream type, and is taken out from the storage portions 42 and 72 and attached or applied. Even if the storage portions 42 and 72 are not separately provided, for example, the bottom surface of the sealed container and the rear end surfaces of the plungers 4 and 7 are adhered with double-sided tape, and the rear end surfaces of the plungers 4 and 7 are attached to the storage portion 42, It may function as 72.

(How to use the syringe)
How to use the syringe will be described with reference to FIGS. 13 to 15.
(A) FIGS. 13 (A) and 14 (A) show a state before use.
(B) FIGS. 13 (A) and 14 (A) show a state in which the protective body 12 is removed.
From (A) to (B), a storage portion 42 for storing the anesthetic 8 is provided at the tip of the handle portion of the plunger 4, and a hole is made in the storage portion 42 immediately before the use of the syringe, and the injection needle 22 is inserted. Apply the anesthetic 8 to the hit area. FIG. 15A shows this situation, and by anesthetizing the free nerve endings existing in the epidermis and dermis, surface anesthesia is applied and needle pain can be alleviated.

(C) FIGS. 13 (C) and 14 (C) show a state in which the plunger 4 is pushed in to expose the injection needle 22.
From (B) to (C), by contacting the tip of the container body 11 with the skin after surface anesthesia, the protrusions 11 _C1 and 11 _C2 located at the tip bite into the skin shallowly, and the sensation of the protrusion sticking. Makes the brain feel. Further, even in the stage of gradually piercing the needle in (C), the injection needle 22 is pierced into the skin while the protrusions are pierced and the illusion is that it hurts.

(D) FIGS. 13 (D) and 14 (D) show a state in which the drug solution 5 is injected into the subcutaneous tissue.
FIG. 15B shows the situation, and the drug solution 5 is applied to the subcutaneous tissue (about 2.3 mm below the skin surface) located below the epidermis (about 0.2 to 0.3 mm) and the dermis (about 2 mm). Inject.

(E) FIGS. 13 (E) and 14 (E) show a state in which all the drug solutions 5 have been injected.
The gasket 3 and the gasket 2 with a needle are in contact with each other.

(F) FIGS. 13 (F) and 14 (F) show a state in which the plunger 4 is removed from the syringe barrel 1.
From (E) to (F), the gasket 2 with a needle having the injection needle 22 is pulled back by the restoring force of the spring 6 and stored in the main body container 11.
Further, when the plunger 4 is strongly pulled upward, the plunger 4 and the gasket 3 with a needle are disconnected, and the gasket 3 with a needle is left in the syringe barrel 1.
In the state (F), the syringe cannot be reused by re-injecting the drug solution between the gasket 4 and the gasket 3 with a needle.

The syringe according to the present invention is useful as a safe, secure and easy-to-use syringe for anyone.

1 Syringe 2, 2'Gasket with needle 3 Gasket (31a: Upper ring part 31b: Middle ring part 31c: Lower ring part 31d, 31e: Hollow part)
4 Plunger (41a: handle 41b: plunger body 41c: connector)
5 Chemical solution 6 Spring body 7 Plunger (71a: Outer wall part 71b: Plunger body part 71c: Connecting body)
8 Anesthetic 11 Container body (11a: upper handle 11b: lower handle 11 _C1 , 11 _C2 : protrusion 11d: inner wall)
12 Protecting group (12a: Knob part 12b: Gasket receiving part 12c: Needle hole part)
13 Connecting part 21 Gasket (21a: Upper ring part 21b: Middle ring part 21c: Lower ring part)
21d Introduction path 21e Injection needle hole 22 Injection needle 23 Chemical solution retainer (23a: top disk 23b: outer peripheral wall)
42,72 Storage section 43,73 Air holes

Claims (14)

Hollow cylindrical container body and
With a protective body that closes one end of the container body and is connected to the inside and outside of the container body,
Have,
The protective body is a syringe characterized in that a needle hole portion for protecting an injection needle arranged in the container body is formed. The syringe according to claim 1, wherein the tip of the container body on one end side is formed with a protrusion protruding from the tip surface. The syringe according to claim 1 or 2, wherein the bottom surface of the needle hole portion is located above the tip surface of the container body. The protective body has a tip portion protruding from the tip end surface of the container body and a gasket receiving portion on which the needle hole portion is formed.
A syringe in which a connecting portion for connecting the tip portion, the gasket receiving portion, and the container body is formed.
The syringe according to any one of claims 1 to 3, wherein the connecting portion is damaged by applying a force to the tip portion, and the container body and the protective body can be separated. The syringe according to claim 4, wherein the gasket receiving portion has an injection needle that is positioned and fixed, and a gasket with a needle that abuts on the inner peripheral surface of the container body is arranged. The gasket with a needle has an introduction path for guiding the drug solution to the injection needle.
The syringe according to claim 5, further comprising a partition wall serving as a contact surface with the drug solution in the introduction path. The syringe according to claim 6, wherein the partition wall has a mechanism for cutting or breaking through the partition wall. The syringe according to any one of claims 1 to 7, wherein the container body has an inner wall portion that is located above the one end side and protrudes in the inner peripheral direction. The syringe according to any one of claims 1 to 8, which has a gasket at the tip that contacts the inner peripheral surface of the container body, and has a plunger that is arranged on the other end side of the container body. The gasket and the plunger are connected by a connecting body, and the gasket and the plunger are connected by a connecting body.
The connecting body moves the gasket with the pressing operation of the plunger, while
The syringe according to claim 9, wherein the syringe is detached from the gasket when the plunger is pulled out. The syringe according to claim 9 or 10, wherein the plunger has a spring body that restores in the direction opposite to the pressing direction. The syringe according to any one of claims 6 to 8, wherein a spring body is provided between the gasket with a needle and the inner wall portion so as to be restored in the direction opposite to the pressing direction of the gasket with a needle. The syringe according to any one of claims 1 to 12, wherein the container body is filled with a chemical solution. The syringe according to any one of claims 9 to 13, wherein a storage portion for storing an anesthetic is provided at the rear end of the plunger.

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