JP2007283132A - Liquid injection needle and liquid injector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid injection needle which can reduces the pain given to a patient, can be easily manufactured, and whose needle part has a strength penetrating through a rubber plug and can reduce the injection resistance, and to provide a liquid injector. <P>SOLUTION: This chemical liquid injection needle 1 comprises a piercing needle part 2 having a piercing part 21 which can be pierced into a living body, a chemical liquid introducing needle part 3 communicable with the chemical liquid vessel inner part, and a housing 4 for supporting the needle parts 2 and 3 in the state where the chemical liquid can pass between the piercing needle part 2 and the chemical liquid introducing needle part 3. The chemical liquid introducing needle part 3 has an outer diameter larger than at least the vicinity of the tip of the piercing part 21 of the piercing needle part 2, and a cutting edge 31 is formed on the end part of the base end side of the chemical liquid introducing needle part 3. The piercing needle part and a liquid introducing needle part are formed with the same one needle body. The piercing needle part has a middle part formed between the piercing part and the liquid introducing needle part and connecting both the parts smoothly by continuously changing the outer diameter. The outer diameter of the piercing part is 0.1 mm or more and 0.254 mm or less, and the inner diameter of the piercing part is 0.05 mm or more and 0.15 mm or less. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid injection needle and a liquid injection device, and more particularly to a liquid injection needle and a liquid injection device used when injecting a liquid such as a chemical into a living body.

  Conventionally, as a chemical solution injection needle used when a chemical solution is injected into a living body such as an intradermal, subcutaneous, or muscle layer, for example, the chemical solution injection needles shown in FIGS. 17 and 18 are known.

  As illustrated, the chemical injection needle 101 includes a needle portion 102 and a base portion 104 that supports the needle portion 102. The needle part 102 is composed of a hollow needle having a constant outer diameter, and is fixed to the base part 104. A blade edge 131 is formed on the proximal end side of the needle portion 102. Further, a female screw 143 for attachment is formed on the inner surface of the base portion 104.

  The chemical solution injection needle 101 is attached to a chemical solution injection port formed at the distal end portion of a chemical solution container (not shown) filled with a chemical solution, which is available on the market, for example. A male screw is formed in the chemical liquid injection port of the chemical liquid container, and the female screw 143 of the chemical liquid injection needle 101 is screwed into the male screw, whereby the chemical liquid injection needle 101 is attached to the chemical liquid container.

  Here, the chemical solution inlet of the chemical solution container is sealed with a rubber stopper (not shown). When the chemical injection needle 101 is attached to the chemical solution container, the blade tip 131 formed on the proximal end side of the needle portion 102 penetrates the rubber stopper, so that the inside of the needle portion 102 and the inside of the chemical solution container are communicated. ing.

  However, in the conventional chemical solution injection needle 101 described above, a relatively thick hollow needle having an outer diameter larger than 0.25 mm is generally used as the needle portion 102. For this reason, pain arises with the puncture of the needle part 102 into the living body or the injection of the medical solution into the living body. Moreover, the fear and anxiety given to the patient by being stabbed with a thick needle are large.

  On the other hand, even if an attempt is made to use a needle portion thinner than before in order to reduce pain given to the patient, such a thin needle portion is firmly attached to the base portion in the middle in the longitudinal direction of the needle portion as shown in FIG. There arises a problem that it is extremely difficult to fix and assemble.

  Further, the thin needle portion as described above is weak in strength. Therefore, even if it is going to attach a chemical injection needle to a chemical solution container, there is a possibility that the needle part cannot penetrate the rubber stopper installed in the chemical injection port of the chemical solution container, and breaks, for example.

  Furthermore, since the thin needle portion as described above inevitably has a small inner diameter and a relatively long length, the flow resistance (hereinafter referred to as “injection resistance”) ") Will become very large. For this reason, there exists a problem that the force for extruding a chemical | medical solution at the time of chemical | medical solution injection | emission needs considerably.

  More specifically, for example, the needle portion of a drug injection needle used in a currently marketed drug injection device for transdermally self-administering an insulin-containing solution into the skin of a diabetic patient is the thinnest. It has an outer diameter of 0.254 mm (31 gauge (G)). “Gauge” means B.I. W. G. It is a number based on the (Birmingham Wire Gage) standard.

  However, when this needle portion having an outer diameter of 0.254 mm (31 G) is used, the injection resistance when administering the drug solution is considerably increased. This is because, theoretically, the injection resistance in the needle portion increases in inverse proportion to the fourth power of the diameter of the needle portion. For this reason, especially patients, such as women, children, and elderly people, who are weak in pushing the plunger of the drug solution injection device, try to self-administer the drug solution under their own skin using a needle part with an outer diameter of 0.254 mm (31 G). However, the drug solution may not enter the skin well. In such cases, the patient must use a needle that is thicker and therefore more painful, such as an outer diameter of 0.30 mm (30 G).

  In addition, when a needle part having an outer diameter of 0.254 mm (31 G) is used, the insulin-containing liquid may leak from the puncture opening in the skin or the tip of the needle part after completion of the injection. One of the causes of this occurrence is that a thin needle portion having an outer diameter of 0.254 mm (31 G) has a high injection resistance, so that it takes time to complete the injection of the chemical solution. It is surmised that the patient is unable to withstand and the needle is removed from the skin before all of the predetermined insulin unit) is completely administered subcutaneously. In the treatment of diabetes, the amount of solution (insulin unit) to be administered in a single injection is predetermined according to the patient, and this predetermined amount of solution must be administered accurately for each injection. Don't be. Therefore, the leakage of the drug solution after the end of the injection means that the drug solution is administered to the patient in an amount smaller than a predetermined amount, and thus a sufficient therapeutic effect cannot be obtained.

  On the other hand, in another field, for example, a dental liquid injector for injecting an anesthetic (lidocaine) into the dental pulp of a patient is used. The needle part (dental needle) of a dental chemical injection device currently on the market is the thinnest and has an outer diameter of 0.26 mm. Even when an anesthetic is injected into a gum or the like using the needle portion having an outer diameter of 0.26 mm, there is a considerably high injection resistance. Here, the main body and the plunger of the dental liquid injector are made of metal, and a healthy doctor injects an anesthetic using the dental liquid injector. Therefore, when the doctor pushes the plunger firmly, the anesthetic can be injected even with the thin needle as described above.

  However, in this dental chemical solution injection device, it is desirable to reduce injection resistance so that anesthetic can be injected with a lighter force, and to relieve pain and the like given to the patient by using a thinner needle part. Moreover, if the syringe is made of metal, it becomes heavy. Therefore, if the injection resistance in the needle portion can be reduced, it is possible to configure an injection device using a lighter material such as plastic, and it is considered that a dental chemical injection device that is easier to handle can be provided.

  As described above, simply reducing the outer diameter of the needle portion in order to suppress the pain given to the patient has caused various problems as described above, and thus could not be actually realized.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to reduce the pain given to a patient, and to make it easy to manufacture and to have a strength capable of penetrating a needle part, for example, a rubber stopper. It is another object of the present invention to provide a liquid injection needle and a liquid injection device that can reduce injection resistance.

  The object of the present invention is achieved by the following means.

  (1) A liquid injection needle attached to a liquid injection port formed at a tip of a liquid container in which a liquid is accommodated, the puncture needle unit having a puncture unit capable of puncturing in a living body, and the liquid A liquid introduction needle portion that can communicate with a container, and a base portion that supports the needle portion in a state in which liquid can flow between the puncture needle portion and the liquid introduction needle portion, and the liquid introduction needle portion The outer diameter is larger than at least the vicinity of the tip of the puncture part, and the edge of the liquid introduction needle part is formed with a cutting edge for penetrating an elastic member that seals the liquid inlet of the liquid container, The puncture needle portion and the liquid introduction needle portion are formed of the same single needle body, and the puncture needle portion is formed between the puncture portion and the liquid introduction needle portion and has a continuous outer diameter. And the outer diameter of the puncture portion is 0. 0. mm above 0.254mm or less, the liquid injection needle, wherein the inner diameter of the puncture section is 0.05mm or 0.15mm or less.

  (2) The liquid injection needle according to (1), wherein a length of a portion of the puncture needle portion protruding outward from a bottom wall of the base portion is 0.5 mm or more and 10 mm or less.

  (3) The liquid injection needle according to (1) or (2) above, wherein an outer diameter of the puncture portion is 0.1 mm or more and 0.25 mm or less.

  (4) The liquid injection needle according to (1) or (2) above, wherein an outer diameter of the puncture portion is 0.18 mm or more and 0.22 mm or less.

  (5) The liquid injection needle according to any one of (1) to (4), wherein the liquid includes a drug acting on a living body.

  (6) The liquid container according to any one of (1) to (5) above, which is attached to the liquid inlet of the liquid container, and the liquid container in which the liquid inlet is formed at the distal end portion and contains the liquid A liquid injection apparatus comprising an injection needle.

  As described above, according to the present invention, the puncture portion that can be punctured in the living body among the needle portions can be made thinner than the conventional one. For this reason, the contact area of the needle part with respect to the nerve network related to pain can be reduced, the stimulation to the nerve network can be reduced, and the pain given to the patient can be reduced.

  Further, the liquid injection needle of the present invention is not assembled by fixing a thin needle portion having a constant diameter to the base portion in the middle in the longitudinal direction. Therefore, even if the puncture portion of the needle portion is thin, it is easy to assemble and manufacture the chemical solution injection needle.

  In addition, since a blade edge for penetrating the elastic member for sealing the liquid inlet of the liquid container can be formed at the end of the liquid introduction needle portion having a relatively large outer diameter, the strength necessary for penetrating the elastic member is sufficient. Can be secured. Therefore, for example, it is possible to prevent a situation in which the needle part cannot be penetrated through the elastic member because it is broken.

  Furthermore, since the medicinal solution introduction needle portion can be made thicker than at least the vicinity of the tip of the puncture portion, for example, by setting the inner diameter in accordance with the outer diameter, the injection resistance in the needle portion can be reduced. In this case, the force for extruding the drug solution is small, and the drug solution can be injected well into the living body.

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

  1 is a cross-sectional view of a chemical liquid injection device to which a chemical liquid injection needle according to a first embodiment of the present invention is attached, FIG. 2 is a cross-sectional view of the injector main body shown in FIG. 1, and FIG. 4 is a side view of the chemical liquid injection needle shown in FIG. 4, and FIG. 4 is a cross-sectional view of the chemical liquid injection needle shown in FIG.

  The chemical injection device shown in FIG. 1 is composed of a chemical injection needle 1 and an injector body 5, and injects a chemical 60 into the living body from the tip of the chemical injection needle 1 when the plunger 52 is pushed. It is.

  As shown in FIG. 2, the injector main body 5 includes a substantially cylindrical chemical solution container 51 that contains a chemical solution 60 therein, and a plunger 52 that can reciprocate in the longitudinal direction inside the chemical solution container 51. .

  A chemical solution injection port 54 is formed in the boss portion 53 on the distal end side (left side in the figure) of the chemical solution container 51, and this chemical solution injection port 54 is sealed by an elastic member 55 such as a rubber plug. The elastic member 55 is fitted and held in a groove 56 formed on the inner surface of the boss portion 53. Further, a male screw 57 that is used when the chemical injection needle 1 is attached is formed on the outer surface of the boss portion 53.

  On the other hand, an opening 58 is formed on the proximal end side (right side in the drawing) of the chemical solution container 51. The plunger 52 is inserted into the inside through the opening 58. A gasket 59 is attached to the tip of the plunger 52. The gasket 59 is in close contact with the inner surface of the chemical liquid container 51 to seal the chemical liquid so that it does not leak backward, and moves to the tip side to push the chemical liquid 60 forward.

  A chemical solution 60 is filled between the elastic member 55 and the gasket 59. The chemical solution 60 used in this chemical solution injection device is a solution, gel, or suspension containing a drug. The drugs that can be used are not substantially limited as long as they are other than drugs that are not suitable for transdermal administration. The drug may act locally or act systemically.

  The elastic member 55 and the gasket 59 are made by molding using a material such as butyl rubber, silicon rubber, or elastomer, for example. The chemical solution container 51 and the plunger 52 are made by molding using a material such as plastic, such as polypropylene or polyethylene, or glass. The chemical solution container 51 is formed entirely or partially from a transparent material, and the chemical solution accommodated therein can be visually confirmed.

  As shown in FIGS. 3 and 4, the drug solution injection needle 1 includes a puncture needle unit 2 having a puncture unit 21 that can be punctured in a living body, a liquid introduction needle unit 3 that can communicate with a drug solution container 51, and these A housing 4 is provided as a base portion that supports the needles 2 and 3 in a state in which a drug solution can flow between the puncture needle 2 and the liquid introduction needle 3. In the first embodiment, as shown in the figure, the puncture needle portion 2 and the liquid introduction needle portion 3 are formed by the same single needle body.

  The housing 4 includes a cylindrical portion 41 and a bottom wall 42 formed at one end of the cylindrical portion 41. On the inner surface of the cylindrical portion 41, a female screw 43 that is screwed into a male screw 57 formed on the boss portion 53 of the chemical liquid container 51 is formed.

  The puncture needle portion 2 and the liquid introduction needle portion 3 are constituted by hollow needles. The puncture needle portion 2 is formed on the distal end side of the drug solution injection needle 1, and the liquid introduction needle portion 3 is formed on the proximal end side of the puncture needle portion 2. The liquid introduction needle portion 3 is set to have an outer diameter larger than that of the puncture portion 21 of the puncture needle portion 2.

  Particularly in the present embodiment, the outer diameter of the puncture portion 21 of the puncture needle portion 2 is preferably 0.254 mm (31 G) or less, more preferably 0.1 mm or more, 0.25 mm or less, and further preferably 0.18 mm or more. It is set to 0.22 mm or less. Thus, from the viewpoint of reducing the puncture pain given to the patient, the upper limit of the outer diameter of the puncture unit 21 is set to be the same as or smaller than the conventional 31G needle, and the lower limit is set to a predetermined strength. It is set from the viewpoint of securing and suppressing an increase in injection resistance. Accordingly, the inner diameter of the puncture portion 21 is desirably 0.05 mm or more and 0.15 mm or less. Even if the outer diameter of the puncture portion 21 is formed in the same manner as the conventional outer diameter of 0.254 mm (31 G), the outer diameter of the liquid introduction portion 3 is large, so that the conventional 31G needle is reduced in terms of reducing injection resistance. Better needles can be provided.

  Moreover, the length of the puncture part 21 of the puncture needle part 2 is preferably 0.2 mm or more and 15 mm or less, more preferably 0.5 mm or more and 10 mm or less. Here, the length of the puncture portion 21 corresponds to the length of the portion of the puncture needle portion 2 that protrudes outward from the bottom wall 42 of the housing 4. Conventionally, the length of the puncture part 21 is generally 10 to 40 mm for subcutaneous and intramuscular administration. On the other hand, in the present embodiment, preferably, the upper limit of the length of the puncture portion 21 is set shorter than the conventional in view of securing a predetermined strength and suppressing an increase in injection resistance, and the lower limit is set in vivo. It is set from the viewpoint of successfully performing puncture to the desired as desired.

  On the other hand, the outer diameter of the chemical solution introduction needle portion 3 is preferably 0.3 mm or more and 0.6 mm or less, more preferably 0.35 mm or more and 0.5 mm or less. Thus, the lower limit of the outer diameter of the drug solution introduction needle portion 3 improves the strength of the portion where the blade tip 31 described later is formed and also positively reduces the injection resistance as described above, as described above. The upper limit is set from the viewpoint of manufacturability while allowing the cutting edge 31 to easily penetrate the elastic member 55 that seals the chemical liquid inlet 54. Accordingly, the inner diameter of the chemical solution introduction needle portion 3 is preferably 0.25 mm or more and 0.5 mm or less.

  A cutting edge 31 for penetrating an elastic member 55 that seals the chemical solution inlet 54 formed at the distal end portion of the chemical solution container 51 is formed at the proximal end side of the chemical solution introduction needle portion 3. The blade edge 31 is formed by, for example, cutting the end portion of the chemical solution introduction needle portion 3 obliquely. The cutting edge 31 is pierced and penetrated by the elastic member 55 when the chemical liquid injection needle 1 is attached to the chemical liquid container 51.

  Further, the puncture needle portion 2 has an intermediate portion 22 formed between the puncture portion 21 and the liquid introduction needle portion 3 so that the outer diameter changes continuously and smoothly connects the two. When the drug solution injection needle 1 is an intradermal / subcutaneous short needle, the intermediate portion 22 is fixed in a state of being inserted into the center portion of the bottom wall 42 of the housing 4.

  When the drug solution injection needle 1 is a long needle for subcutaneous and intramuscular use, it is not necessary that all the parts that can be punctured in the living body are thinner than the liquid introduction needle part 3. For example, as shown in FIG. 5, the intermediate part 22 whose outer diameter continuously changes can also be punctured into the living body, and as a result, the intermediate part 22 is configured to be included in the puncture part 21. Also good. In this case, the outer diameter on the base end side with respect to the intermediate portion 22 is fixed and the thick portion is fixed in a state of being inserted into the central portion of the bottom wall 42 of the housing 4.

  Further, in the present invention, for example, as shown in FIG. 6, the shape from the puncture portion 21 to the portion fixed to the bottom wall 42 of the housing 4 is not necessarily the same shape as shown in FIG. The shape is not limited, and the outer diameter may be continuously changed.

  The intermediate portion 22 has a tapered shape, and the outline of the cross section cut by a plane along the axis is linear or concave. In particular, the intermediate portion 22 shown in FIGS. 4, 5, and 6 has a shape (tapered shape) in which the inner diameter gradually decreases toward the tip side. Thereby, when the chemical liquid flows from the liquid introduction part 3 through the intermediate part 22 to the puncture part 21, the flow rate is accelerated and flows vigorously.

  The housing 4 is made by molding using a material such as plastic, such as polypropylene or polyethylene, or glass. The puncture needle portion 2 and the liquid introduction needle portion 3 are generally made of stainless steel, for example, by plastic working. However, it is also possible to make the needle portions 2 and 3 from other metals such as titanium or a material such as plastic.

  The puncture needle portion 2 and the liquid introduction needle portion 3 are fixed to the housing 4 by, for example, insert molding or adhesion in the form shown in FIG. If the needle portions 2 and 3 are simply made thin, the bonding force of the needle portions 2 and 3 to the housing 4 is reduced, and the needle portions 2 and 3 may fall out of the housing 4 toward the distal end side. On the other hand, in the present embodiment, the needle portions 2 and 3 are joined to the housing 4 at the middle portion where the outer diameter is smoothly expanded or at the portion having a larger outer diameter on the base end side than the middle portion. There is no possibility that the needle portions 2 and 3 fall off to the tip side. Further, since the joining area between the needle portions 2 and 3 and the housing 4 increases, the needle portions 2 and 3 can be firmly fixed to the housing 4. Therefore, even if the puncture portion 21 of the puncture needle portion 2 is thin, it is easy to assemble and manufacture the drug solution injection needle 1.

  Next, a method of using the chemical solution injection device with the chemical solution injection needle attached to the chemical solution container will be described.

  First, the housing 4 of the chemical solution injection needle 1 is extrapolated to the boss portion 53 of the chemical solution container 51, and the cutting edge 31 formed at the end portion of the liquid introduction needle portion 3 is pierced through the elastic member 55. Thereby, the inside of the needle parts 2 and 3 and the inside of the chemical | medical solution container 51 are connected. Subsequently, the medicinal solution injection needle 1 is screwed into the medicinal solution container 51 by screwing the female screw 43 formed on the inner surface of the housing 4 of the medicinal solution injection needle 1 with the male screw 57 formed on the boss portion 53 of the medicinal solution container 51. .

  Here, since the outer diameter of the drug solution introduction needle portion 3 is set to be larger than that of the puncture portion 21 of the puncture needle portion 2, it is possible to sufficiently ensure the strength necessary for penetrating the elastic member 55. Therefore, for example, it is possible to prevent a situation in which the chemical solution introduction needle portion 3 cannot be penetrated through the elastic member 55 due to breakage.

  In this way, the chemical liquid injection needle 1 is attached to the chemical liquid container 51, and preparation for use of the chemical liquid injection apparatus is completed. Next, the drug solution injection needle 1 of the drug solution injection device is punctured into the living body of the patient to be injected with the drug solution. However, since the puncture portion 21 of the puncture needle portion 2 is thinner than before, the contact area of the needle portion with the nerve network related to pain can be reduced, the stimulation to the nerve network is reduced, and pain is generated. Reduced.

  Then, by pushing the plunger 52 of the injector body 5, the drug solution 60 in the drug solution container 51 passes through the needle parts 2 and 3 of the drug solution injection needle 1, for example, intradermal, subcutaneous, muscle, or various It is injected into a living body such as an organ.

  Here, since the outer diameter of the chemical solution introduction needle portion 3 is set to be relatively large, the inner diameter of the chemical solution introduction needle portion 3 can also be set to be large, and the injection resistance in the needle portion can be reduced. . Therefore, the force for pushing the plunger 52 to push out the chemical solution is small, and the chemical solution can be injected well into the living body.

  As described above, in the present embodiment, by narrowing the portion of the needle portion that is punctured by the patient and relatively thickening the other portion of the needle portion, it is possible to use a thin drug injection needle that has no pain or very little pain. Nevertheless, it is possible to provide a chemical injection needle with low injection resistance. In particular, the outer diameter of the puncture portion 21 is 0.254 mm (31 G) or less, preferably 0.1 mm or more and 0.25 mm or less, more preferably 0.18 mm or more and 0.22 mm or less, so that it is currently marketed. The injection resistance can be reduced while providing a puncture portion equivalent to the thinnest needle or thinner than any drug injection needle currently on the market. Therefore, even if there is no pain or very little pain, and a physically or mentally weak patient such as a woman, child, elderly person, etc. self-administers the drug solution, it is difficult and quick. A chemical injection needle and a chemical injection device that can administer a chemical can be provided.

  3 to 6 have only the needle portions 2 and 3 formed of a single needle body, the chemical liquid injection needle of the present invention is not limited to this. A plurality of needle bodies may be attached to one housing 4. If it does in this way, the injection amount of a chemical | medical solution can be increased. In addition, since the drug solution is dispersed and injected into the living body, a rapid effect of the drug can be expected.

  FIG. 7 is a side view of a chemical liquid injection needle according to the second embodiment of the present invention, and FIG. 8 is a cross-sectional view of the chemical liquid injection needle shown in FIG. In the following, differences from the first embodiment will be mainly described, and description of common points will be omitted as appropriate.

  The chemical injection device according to the second embodiment of the present invention is different from the first embodiment only in the configuration of the chemical injection needle, and the configuration of the injector body 5 is the same.

  As shown in FIGS. 7 and 8, the chemical injection needle 1a includes a puncture needle portion 2a having a puncture portion 21a that can be punctured in a living body, a liquid introduction needle portion 3a that can communicate with the liquid container 51, and these And a housing 4a that supports the needles 2a and 3a in a state in which a drug solution can flow between the puncture needle 2a and the liquid introduction needle 3a. As shown in the figure, the medicinal solution injection needle 1a according to the second embodiment has a puncture needle portion 2 and a liquid in that the puncture needle portion 2a and the medicinal solution introduction needle portion 3a are formed by separate and independent needle bodies. This is different from the first embodiment in which the introduction needle portion 3 is formed by the same single needle body.

  The housing 4a includes a cylindrical portion 41a and a bottom wall 42a formed at one end of the cylindrical portion 41a. On the inner surface of the cylindrical portion 41a, a female screw 43a that is screwed into a male screw 57 formed on the boss portion 53 of the chemical liquid container 51 is formed.

  The puncture needle part 2a is comprised from the hollow needle made from the material similar to the puncture needle part 2 of embodiment mentioned above. The puncture needle portion 2a is fixed to the housing 4a in a state where the root portion 22a is inserted into a mounting hole 44a formed on the distal end side of the bottom wall 42a of the housing 4a.

  The liquid introduction needle portion 3a is also composed of a hollow needle made of the same material as that of the liquid introduction needle portion 3 of the above-described embodiment. The liquid introduction needle portion 3a is fixed to the housing 4a in a state where the root portion 32a is inserted into a mounting hole 45a formed on the base end side of the bottom wall 42a of the housing 4a. The liquid introduction needle portion 3a is set to have a larger outer diameter than the puncture portion 21a of the puncture needle portion 2a.

  The housing 4a is formed with a hole 46a for connecting between the puncture needle portion 2a and the liquid introduction needle portion 3a.

  In 2nd Embodiment, the outer diameter of the chemical | medical solution introduction needle | hook part 3a becomes like this. Preferably they are 0.3 mm or more and 2 mm or less, More preferably, they are 0.35 mm or more and 1.5 mm or less. Accordingly, the inner diameter of the chemical solution introduction needle 3a is preferably 0.25 mm or more and 1.2 mm or less.

  The puncture needle portion 2a and the liquid introduction needle portion 3a are fixed to the housing 4a, for example, in the form shown in FIG. 8 by insert molding or adhesion. Here, as shown in FIG. 8, the puncture needle portion 2a and the drug solution introduction needle portion 3a are formed by separate and independent needle bodies, so that the drug solution injection needle 1a is not required to have a special manufacturing method. It can be easily made by the same method as above. Moreover, since the needle portions 2a and 3a are engaged with the mounting holes 44a and 45a, respectively, they are firmly fixed to the housing 4a.

  When the drug solution injection needle 1a is a long needle for subcutaneous and intramuscular use, it is not necessary that all the parts that can be punctured in the living body are thinner than the liquid introduction needle part 3a. For example, as shown in FIG. 9, a portion where the outer diameter changes continuously can also be punctured into the living body, and as a result, the outer portion with a constant outer diameter located on the base end side is the bottom wall of the housing 4a. It is fixed in a state where it is inserted into the central portion of 42a. Further, in the present invention, the shape from the puncture portion 21a to the portion fixed to the bottom wall 42a of the housing 4a is not necessarily limited to the shape as shown in FIG. Alternatively, the outer diameter may be changed.

  In the present invention, for example, as shown in FIG. 10, even if the proximal end portion of the puncture needle portion 2a is inserted into the opening on the distal end side of the drug solution introduction needle portion 3a and the both needle portions 2a and 3a are fixed in advance. Good. Fixing can be performed by adhesion or welding. And the puncture needle part 2a and the chemical | medical solution introduction needle part 3a which were mutually fixed beforehand are fixed to the housing 4a by insert molding or adhesion | attachment in the form as shown, for example in FIG.

  Further, in the present invention, for example, as shown in FIG. 11, the end surface on the proximal end side of the puncture needle portion 2a and the end surface on the distal end side of the drug solution introduction needle portion 3a may be fixed in advance. Fixing can be performed by adhesion or welding. In this case, the shape (tapered shape) where the inner diameter of the vicinity of the joint surface between the puncture needle portion 2a and the drug solution introduction needle portion 3a gradually decreases from the drug solution introduction needle portion 3a toward the puncture portion 21a of the puncture needle portion 2a. You may comprise so that. Thereby, when the chemical liquid flows from the liquid introduction part 3a to the puncture part 21a, the flow velocity is accelerated and flows vigorously.

  Moreover, although the chemical | medical solution injection needle shown in FIGS. 7-11 has only one puncture needle part 2a, the chemical | medical solution injection needle of this invention is not restricted to this, One chemical | medical solution introduction needle part 3a is provided. On the other hand, a plurality of puncture needle portions 2a may be provided correspondingly. A plurality of pairs of puncture needle portion 2a and drug solution introduction needle portion 3a may be provided for one housing 4a.

  FIG. 12 is a side view of a chemical liquid injection needle according to the third embodiment of the present invention, and FIG. 13 is a cross-sectional view of the chemical liquid injection needle shown in FIG. In the following, differences from the first embodiment will be mainly described, and description of common points will be omitted as appropriate.

  The chemical injection device according to the third embodiment of the present invention is different from the first embodiment only in the configuration of the chemical injection needle, and the configuration of the injector body 5 is the same.

  As shown in FIGS. 12 and 13, the chemical injection needle 1 b includes a puncture needle portion 2 b having a puncture portion 21 b that can be punctured in a living body, a liquid introduction needle portion 3 b that can communicate with the liquid container 51, and these And a housing 4b that supports the needles 2b and 3b in a state in which a drug solution can flow between the puncture needle 2b and the liquid introduction needle 3b.

  As shown in the figure, the medicinal solution injection needle 1b according to the third embodiment is that the medicinal solution introducing needle portion 3b and the housing 4b are integrally formed of the same material, and thus the puncture needle portion 2 and the liquid introducing needle portion. 3 is formed by a single needle body, and the liquid injection needle 1 according to the first embodiment, and the puncture needle portion 2a and the chemical liquid introduction needle portion 3a are formed by separate independent needle bodies. This is different from the chemical injection needle 1a according to the second embodiment.

  The housing 4b includes a cylindrical portion 41b and a bottom wall 42b formed at one end of the cylindrical portion 41b. On the inner surface of the cylindrical portion 41b, a female screw 43b that is screwed into a male screw 57 formed on the boss portion 53 of the chemical solution container 51 is formed.

  The puncture needle part 2b is comprised from the hollow needle made from the material similar to the puncture needle parts 2 and 2a of embodiment mentioned above. The puncture needle portion 2b is fixed to the housing 4b in a state where the root portion 22b is inserted into a mounting hole 44b formed on the distal end side of the bottom wall 42b of the housing 4b.

  As described above, the liquid introduction needle portion 3b is formed on the base end side of the bottom wall 42b by being integrally molded with the same material as the housing 4b. The material used for forming the liquid introduction needle portion 3b and the housing 4b is the same material as the housings 4 and 4a of the above-described embodiment. A blade edge 31b for penetrating an elastic member 55 that seals the chemical solution inlet 54 formed at the distal end portion of the chemical solution container 51 is formed at the proximal end of the chemical solution introduction needle portion 3b. The blade edge 31b is formed at the same time when the liquid introduction needle portion 3b and the housing 4b are formed, for example. The cutting edge 31b may be formed by cutting the end portion of the chemical solution introduction needle portion 3a obliquely. Further, the shape of the blade edge 31b may be any shape that is suitable for penetrating the elastic member 55, and may be, for example, a conical pointed shape. The liquid introduction needle portion 3b is set to have a larger outer diameter than the puncture portion 21b of the puncture needle portion 2b.

  The housing 4b is formed with a hole 46b for connecting the puncture needle portion 2b and the liquid introduction needle portion 3b.

  In 3rd Embodiment, the outer diameter of the chemical | medical solution introduction needle | hook part 3b becomes like this. Preferably they are 0.3 mm or more and 2 mm or less, More preferably, they are 0.35 mm or more and 1.5 mm or less. Accordingly, the inner diameter of the chemical solution introduction needle portion 3b is preferably 0.25 mm or more and 1.2 mm or less.

  The puncture needle portion 2b is fixed to the housing 4b by, for example, insert molding or adhesion in the form shown in FIG. Here, as shown in FIG. 13, since the chemical solution introduction needle portion 3b is integrally formed from the same material as that of the housing 4b, the chemical solution injection needle 1b can be simply used in the same manner as before without requiring a special manufacturing method. Can be made. Moreover, since the puncture needle portion 2b is engaged with the mounting hole 44b, it is firmly fixed to the housing 4b.

  When the drug solution injection needle 1b is a long needle for subcutaneous or intramuscular use, it is not necessary that all the parts that can be punctured in the living body are thinner than the liquid introduction needle part 3b. For example, as shown in FIG. 14, a portion where the outer diameter continuously changes can also be punctured into the living body, and as a result, the outer portion with a constant outer diameter located on the base end side is the bottom wall of the housing 4b. It is fixed in a state where it is inserted into the central portion of 42b. In the present invention, the shape from the puncture portion 21b to the portion fixed to the bottom wall 42b of the housing 4b is not necessarily limited to the shape as shown in FIG. Alternatively, the outer diameter may be changed.

  Further, in the present invention, for example, as shown in FIG. 15, the outer diameter is continuously changed to a shape (tapered shape) that gradually decreases toward the cutting edge 31b without changing the inner diameter of the chemical solution introducing needle portion 3b. Also good. Thereby, it is possible to easily pierce the medicinal solution introduction needle portion 3b into the elastic member 55 that seals the medicinal solution injection port 54 formed at the distal end portion of the medicinal solution container 51.

  In the present invention, for example, as shown in FIG. 16, without changing the outer diameter of the chemical solution introducing needle portion 3b, the inner diameter is continuously changed to a shape (tapered shape) that gradually increases toward the cutting edge 31b. Also good. Thereby, when the chemical liquid flows from the liquid introduction part 3b to the puncture part 21b, the flow rate is accelerated and flows vigorously.

  In the present invention, although not shown, the outer diameter is continuously changed to a shape (tapered shape) that gradually decreases toward the cutting edge 31b, and the inner diameter is gradually increased toward the cutting edge 31b (tapered). Of course, the shape may be continuously changed.

  Moreover, although the chemical | medical solution injection needle shown in FIGS. 12-16 has only one puncture needle part 2b, the chemical | medical solution injection needle of this invention is not restricted to this, One chemical | medical solution introduction needle part 3b is provided. On the other hand, a plurality of puncture needle portions 2b may be provided correspondingly. In addition, a plurality of pairs of puncture needle portion 2b and drug solution introduction needle portion 3b may be provided for one housing 4b.

  The embodiments described above are not described for limiting the present invention, and various modifications can be made by those skilled in the art within the technical idea of the present invention.

It is sectional drawing of the chemical injection device with which the chemical injection needle concerning the 1st Embodiment of this invention was attached. It is sectional drawing of the injector main body shown by FIG. It is a side view of the chemical injection needle shown in FIG. It is sectional drawing of the chemical | medical solution injection needle shown by FIG. It is sectional drawing of the modification of the chemical | medical solution injection needle which concerns on 1st Embodiment. It is sectional drawing of another modification of the chemical | medical solution injection needle which concerns on 1st Embodiment. It is a side view of the chemical injection needle concerning the 2nd embodiment of the present invention. It is sectional drawing of the chemical | medical solution injection needle shown by FIG. It is sectional drawing of the modification of the chemical | medical solution injection needle which concerns on 2nd Embodiment. It is sectional drawing of another modification of the chemical | medical solution injection needle which concerns on 2nd Embodiment. It is sectional drawing of another modification of the chemical injection needle concerning a 2nd embodiment. It is a side view of the chemical | medical solution injection needle which concerns on the 3rd Embodiment of this invention. It is sectional drawing of the chemical | medical solution injection needle shown by FIG. It is sectional drawing of the modification of the chemical | medical solution injection needle which concerns on 3rd Embodiment. It is sectional drawing of another modification of the chemical | medical solution injection needle which concerns on 3rd Embodiment. It is sectional drawing of another modification of the chemical injection needle concerning a 3rd embodiment. It is a side view of the conventional chemical injection needle. It is sectional drawing of the conventional chemical | medical solution injection needle.

Explanation of symbols

1, 1a, 1b ... chemical injection needle (liquid injection needle),
2, 2a, 2b ... puncture needle part,
21, 21a, 21b ... puncture part,
22 ... middle part,
3, 3a, 3b ... chemical introduction needle (liquid introduction needle),
31, 31a, 31b ... cutting edge,
4, 4a, 4b ... housing (base part),
5 ... injector body,
51 ... Chemical container (liquid container),
54 ... Chemical solution inlet (liquid inlet),
55 ... an elastic member,
60: Chemical solution (liquid).

Claims (3)

A liquid injection needle attached to a liquid injection port formed at the tip of a liquid container in which liquid is stored,
A puncture needle portion having a puncture portion capable of being punctured in a living body,
A liquid introduction needle portion capable of communicating with the liquid container;
A base portion that supports both needle portions in a state in which liquid can flow between the puncture needle portion and the liquid introduction needle portion;
The liquid introduction needle part has an outer diameter larger than at least the tip vicinity of the puncture part,
A blade edge for penetrating an elastic member that seals the liquid inlet of the liquid container is formed at the end of the liquid introduction needle part,
The puncture needle portion and the liquid introduction needle portion are formed by the same single needle body,
The puncture needle portion has an intermediate portion that is formed between the puncture portion and the liquid introduction needle portion, and the outer diameter continuously changes to smoothly connect the two.
An outer diameter of the puncture portion is 0.1 mm or more and 0.254 mm or less, and an inner diameter of the puncture portion is 0.05 mm or more and 0.15 mm or less.   2. The liquid injection needle according to claim 1, wherein a length of a portion of the puncture needle portion that protrudes outward from a bottom wall of the base portion is not less than 0.5 mm and not more than 10 mm.   3. A liquid comprising: a liquid container having a liquid inlet formed at a tip thereof and containing a liquid therein; and the liquid injection needle according to claim 1 attached to the liquid inlet of the liquid container. Injection device.

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