JP6524392B2 - Syringe with injection needle - Google Patents

Description

  The present invention relates to a syringe with a needle that constitutes a syringe used in medical fields such as hospitals and clinics, and in particular, minimizes the puncture resistance when puncturing the skin of a patient (human body) to minimize the burden on the patient. The present invention relates to a syringe with an injection needle integrally provided with a synthetic resin injection needle that can be finely formed so as to be reduced.

  Conventionally, with regard to an injection needle used for puncturing the skin of a patient at a medical site, when it is used for a disposable (disposable) syringe, the conventional metal injection needle requires a waste treatment cost and a manufacturing cost after the treatment. A point was pointed out as a problem. Therefore, in particular, for the purpose of cost reduction, it has been proposed to integrally mold the entire injection needle together with the syringe with a synthetic resin.

  Here, when the injection needle is used particularly for puncturing the skin of the patient, the puncturing resistance must be reduced in order to reduce the pain at the time of puncturing felt by the patient as much as possible and to reduce the burden on the patient. It is necessary to sharpen the needle tip of the injection needle and to minimize the outer diameter of the needle as much as possible. In order to maintain strength while integrally molding the needle portion and the base on which the needle portion is attached from the synthetic resin, in particular, when molding the injection needle with a synthetic resin, the outer diameter dimension of the needle portion It has been pointed out that it is difficult to reduce the size.

  Specifically, as the outside diameter size of the injection needle is reduced by making the injection needle made of synthetic resin, the buckling strength is lowered, resulting in the result that the needle part is easily broken. If the needle breaks, it will remain in the skin, and such a situation should be absolutely avoided. In addition, even if the outside diameter of the injection needle can be set small while securing the buckling strength, the hollow cylinder made of synthetic resin is cut obliquely and sharpened for cost reduction. When it is intended to form the tip, the needle tip must have an elliptical shape by all means, and as a result, there is a limit to reducing the puncture resistance, and the burden on the patient is reduced in terms of pain felt by the human body. It was impossible.

  In the prior art as described above, a prior art in which the needle portion and the mounting portion are integrally molded with a synthetic resin has been developed and proposed as shown in Patent Document 1.

JP, 2005-323622, A

  However, the prior art described in Patent Document 1 mentioned above is, first of all, a resin needle member used when injecting a drug solution from a stopper provided in a tube such as a blood transfusion set, blood circuit, etc. In the first place, the purpose of the injection needle to be punctured in the skin of the present invention is different, and hence the requirements for molding are completely different. Specifically, the puncture strength is required to be much stronger than that in the case of puncturing the skin, since the puncture is made while penetrating the stopper made of rubber or synthetic resin, not the skin of the human body. It will be For this reason, it is not assumed that the outer diameter of the injection needle is finely formed, and the reinforcing member which is unnecessary when puncturing the skin of the human body can not but be configured there were.

  As a result, although Patent Document 1 discloses a technique for integrally molding the needle portion and the mounting portion from a synthetic resin, using the disclosed technique as it is for puncture of human skin is a structure. On top of that, and also in terms of size, there is no technique that is suggested as an improvement of the injection needle for puncturing the skin of the human body.

  As described above, in the conventional syringe, although it can be expected to manufacture inexpensively if integrally molded from a synthetic resin, it has to be manufactured finely in consideration of the burden on the patient in terms of pain, and There has been a demand for the development of a new technology capable of solving the contradictory request at once in the sense that the buckling strength must be sufficiently secured even if the injection needle can be finely manufactured.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its main object is to provide a syringe with a needle that can be manufactured at a low cost by integrally molding the needle and the syringe body from synthetic resin.

  Another object of the present invention is to provide a syringe with an injection needle having a synthetic resin injection needle capable of reducing the puncture resistance as much as possible to reduce pain at the time of puncture.

  Another object of the present invention is to provide a syringe with an injection needle having a synthetic resin injection needle capable of securing sufficient strength even when finely molded.

In order to solve the problems described above and to achieve the object, the syringe with a needle according to the present invention comprises, according to the description of claim 1, a hollow cylinder whose one end face is open, from the open end face comprising a plunger and a synthetic resin of the syringe body to be inserted in a liquid-tight, with a chemical liquid passage communicating with the said syringe body, and integrally molded synthetic resin needle on the other end face of said syringe body and said injection needle, wherein a proximal end attached to the syringe body, the tip is molded from integrally provided with a synthetic resin and a needle portion having a sharpened needle tip, said needle portion, the distal end portion and the intermediate is integrally formed and a part and a base, said tip, said needle tip to tip needle portion formed in the intermediate circumstances has, coaxially to said distal needle portion, and, formed on the middle circumstances It is integrally molded and a connecting portion, the chemical liquid flow path Together are formed in a state of penetrating the inside of the base and intermediate portions of the needle portion and the base end portion, without opening at the tip portion, is formed so as to open at a distal end surface of said intermediate portion, said connection The part is disposed in a state of being separated from the middle part, and is integrally connected to a tip of the middle part by a plurality of connection stems .

  In the syringe with a needle according to the present invention, according to the second aspect of the present invention, the inner diameter of the drug solution channel at the proximal end is the inner diameter of the communication hole formed in the other end face of the syringe body. It is characterized in that it is set identically to.

  Further, according to the third aspect of the present invention, in the syringe with an injection needle according to the present invention, the inner diameter of the drug solution channel at the proximal end is the inner diameter of the communication hole formed in the other end face of the syringe body. It is characterized in that the diameter is set smaller than that.

In the syringe with an injection needle according to the present invention, according to the fourth aspect, the connection portion is formed in a cylindrical shape .

Further, according to the fifth aspect of the present invention, in the syringe with an injection needle, the base end surface of the connection portion and the tip end surface of the intermediate portion are separated by a predetermined distance along the axial direction. It is characterized in that the chemical solution to be poured out from the outlet opening is radially discharged through the gap between the adjacent connection stems .

Further, according to the sixth aspect of the present invention, in the syringe with a needle according to the present invention, the connecting stem has an outer surface continuously extending in the axial direction from the outer peripheral surface of the intermediate portion, and It is characterized by including an inclined surface connecting the tip end edge and the outer peripheral surface of the cylindrical body portion .

Further, according to the seventh aspect of the present invention, the syringe with an injection needle according to the present invention is characterized in that the connection stems are equiangularly arranged along the circumferential direction .

Further, according to the eighth aspect of the present invention, the syringe with an injection needle is characterized in that two of the connection stems are provided, and the outer periphery of the gap is divided into two by the connection stem . .

Further, according to the ninth aspect of the present invention, the syringe with an injection needle is characterized in that four of the connection stems are provided, and the outer periphery of the gap is divided into four by the connection stems . .

Further, in the syringe with an injection needle according to the present invention, according to the description of claim 10, the tip needle portion is erected from the bottom surface to a triangular or substantially triangular shape and from the bottom toward the tip of the tip needle portion. It is characterized in that it is formed in a triangular pyramid shape or a substantially triangular pyramid shape having three triangular or substantially triangular slopes .

Further, in the syringe with an injection needle according to the present invention, according to the description of claim 11 , among the three slopes of the tip needle portion , the first and second slopes respectively indicate the tip surface of the cylindrical body portion. A first perpendicular angle, and intersect each other at a predetermined first acute angle, and each intersecting line extends continuously from the outer peripheral surface of the cylindrical body portion along the axial direction without any step. The third inclined surface is inclined at a predetermined second acute angle with respect to a vertical axis orthogonal to the tip surface of the cylindrical body, and the third inclined surface is inclined at the tip of the tip needle. A second oblique side is defined by the intersection of the first oblique side and the intersection line of the third slope and the first slope, and a third inclination line is defined by the intersection of the third slope and the second slope. the hypotenuse of provisions, the second and third hypotenuse, this crossing at the needle tip of the distal needle portion And is characterized.

In the syringe with an injection needle according to the present invention , according to claim 12, the tip needle portion is formed in a conical shape .

Further, in the syringe with an injection needle according to the present invention, according to the description of claim 13, the distal end portion includes a tapered portion disposed between the distal end needle portion and the connection portion, and the tapered portion The invention is characterized in that it comprises a conical tapered surface which connects the bottom side of the tip needle portion and the tip outer peripheral edge of the connecting portion .

In the syringe with an injection needle according to the present invention , according to the description of claim 14, the bottom side of the tip needle portion is characterized by including at least an arc-like line segment at a junction with the tapered portion. There is.

In the syringe with an injection needle according to the present invention, according to the fifteenth aspect, the top of the bottom surface of the tip needle portion is located on the tip outer peripheral edge of the cylindrical body portion .

The effect | action by the subject solution means of the said Claim 1 is as follows. That is, it comprises a hollow cylindrical body whose one end face is opened, and a synthetic resin syringe body into which the plunger is inserted in a fluid tight manner from this open end face, and a chemical liquid flow path communicating with the inside of the syringe body; The injection needle comprises a synthetic resin injection needle integrally formed on the other end face of the syringe body, the tip of the injection needle having a sharp tip and a solid tip, and the injection needle The medical fluid channel formed in a state of penetrating the inside of the proximal end and the proximal part and the intermediate part that constitute the needle part, and the chemical liquid flow path does not open at the distal end, but the distal end of the intermediate part Since the syringe is formed to be open at the surface, the syringe with the injection needle can be integrally molded from a synthetic resin to achieve the effect of reducing the cost and, at the same time, the puncture resistance of the injection needle is as high as possible. Set a small size to lighten the pain at the time of puncture That can in achieving, also would be of that be molded finely to ensure sufficient strength.

  According to the second aspect of the present invention, the inside diameter of the drug solution channel at the proximal end is set equal to the inside diameter of the communication hole formed on the other end face of the syringe body. Therefore, the drug solution stored in the syringe body can smoothly enter the drug solution channel of the injection needle without any resistance.

  Further, according to the third aspect of the present invention, the inside diameter of the drug solution channel at the proximal end is set to be smaller than the inside diameter of the communication hole formed in the other end face of the syringe body. Thus, the drug solution stored in the syringe body can be smoothly introduced into the drug solution channel of the injection needle.

  As described above, according to the present invention, it is possible to provide a syringe with an injection needle which can be manufactured by integrally molding the injection needle and the syringe body from a synthetic resin to reduce the cost.

  Further, according to the present invention, a syringe with a needle having an injection needle can be provided which can reduce the puncture resistance by setting the puncture resistance as small as possible.

  Further, according to the present invention, a syringe with a needle having an injection needle capable of securing sufficient strength even when finely molded is provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the structure of one Example of the syringe with an injection needle concerning this invention. It is a top view of the syringe with an injection needle shown in FIG. FIG. 3 is a side cross-sectional view showing the internal structure of the syringe with a needle shown in FIG. 1 cut along the line A-A in FIG. 2. It is a front view which takes out and shows the injection needle of the syringe with an injection needle shown in FIG. It is a side view which takes out the injection needle of the syringe with an injection needle shown in FIG. 1, and shows it from a different direction from FIG. It is a top view of the injection needle shown in FIG. It is sectional drawing cut and shown along the BB line of FIG. It is a front view taking out and showing the composition of the needle part of an injection needle. It is a perspective view which takes out and shows the structure of the needle part of the injection needle shown in FIG. It is a perspective view which shows the structure of the needle part of an injection needle from the direction different from FIG. It is a perspective view which shows the structure of the needle part of an injection needle from the direction opposite to FIG. It is a perspective view which takes out and shows the structure of the needle part of the injection needle in which two connection stems as a 1st modification of this Example are provided. It is a top view which shows the structure of the needle part of the injection needle shown in FIG. It is a perspective view which shows the structure in which one connection stem as a 2nd modification of this Example is provided. It is a perspective view showing the composition where the tip needle part as the 3rd modification concerning this invention was formed conically. It is a perspective view which shows the structure by which the oblique side of the front-end | tip needle part as a 4th modification concerning this invention is formed in a jagged shape.

  Hereinafter, an embodiment of a syringe with a needle according to the present invention will be described using the attached drawings.

  1 to 3 are views showing the structure of an embodiment of a syringe with a needle for puncturing the skin of a human body and injecting a medical solution subcutaneously, and FIGS. 4 to 11 are integrally shown on the body of the syringe. It is a figure which takes out and shows the structure of the formed injection needle.

  First, as shown in FIG. 1 to FIG. 3, the syringe with injection needle 10 is formed of a hollow cylinder whose one end face 12A is open, and a synthetic resin in which a plunger not shown is inserted from the open end face in a fluid tight manner. A syringe body 12 and a synthetic resin injection needle 16 integrally formed with the other end face 12B of the syringe body 12, provided with a drug solution channel 14 communicating with the inside of the syringe body 12 and penetrating inside the syringe body 12; Have.

  Here, a flange 18 for finger hooking for facilitating the manual pushing operation of the plunger is integrally attached to one end of the syringe body 12 on the one end face 12A side. The drug solution channel 14 of the injection needle 16 is in communication with the internal space of the syringe body 12 through a communication hole 12C formed in the other end surface 12B of the syringe body 12.

  The syringe 10 with an injection needle thus configured is integrally molded by injection from a synthetic resin described later using an injection molding apparatus (not shown) and manufactured as a single part.

  Next, the structure of the injection needle 16 will be described in detail in a state where it is taken out and shown in FIG. 4 to FIG. The injection needle 16 is configured to include a proximal end 20 integrally connected to the syringe body 12 and a needle 22 disposed in a state continuous with the proximal end 20. And this needle part 22 is integrally provided with the front-end | tip part 24, the intermediate part 26, and the base 28, and the front-end | tip part 24 has sharp needle tip S at the front-end, and is formed solidly.

  The chemical solution flow path 14 described above is formed in a state of penetrating the inside of the proximal end portion 20 and the base portion 28 and the intermediate portion 26 of the needle portion 22, and is a feature of the present invention. The outlet opening 14E of the passage 14 is set so as not to open at the distal end portion 24 but to open at the distal end surface formed to be orthogonal to the axial direction of the intermediate portion 26. In particular, as shown in FIG. 7, the drug solution channel 14 includes a first channel 14 A located in the proximal end portion 20 and a second channel 14 B located in the base 28 of the needle portion 22, It is configured to be continuous with the third flow passage 14C located in the middle portion 26 of the needle portion 22.

  The inner diameter of the first flow passage 14A located in the base end portion 20 and the inner diameter of the communication hole 12B formed in the other end surface 12A of the syringe main body 12 described above are set to be the same. That is, the inner peripheral surface of the first flow passage 14A and the inner peripheral surface of the communication hole 12B are joined in a continuous state without any step. For this reason, as shown in FIG. 7, the drug solution contained in the syringe body 12 is smoothly pushed out from the communication hole 12B into the drug solution channel 14 of the injection needle 16 according to the pushing operation of the plunger not shown. become.

  Here, the inner diameter dimension of the drug solution channel 14 in the injection needle 16 is smaller than that of the first channel 14A located in the proximal end 20, the channel 14B of the base 28 of the needle portion 22 and the intermediate portion 26 The third flow path 14C is set to have a smaller diameter. Further, in this embodiment, the inner diameter dimensions of the second and third flow channels 14B and 14C are set to be equal to each other. Specifically, in this embodiment, the inner diameters of the communication hole 12B and the first flow passage 14A are both set to φ 0.6 mm, and the inner diameters of the second and third flow passages 14B and 14C are , And both are set to φ 0.3 mm.

Further, the first flow passage 14A and the second flow passage 14B are set so that the inner diameter can be gradually narrowed through the tapered narrowed portion 14D. As a result, the drug solution contained in the syringe body 12 is further smoothly pushed out from the communication hole 12B into the drug solution channel 14 of the injection needle 16 according to the pressing operation of the plunger (not shown). It is set to be ordered.

  Next, as shown in FIG. 7 and FIG. 8, the tip end portion 24 of the injection needle 16 has a tip end defining the tip S sharp and a solid tip end needle portion 30, and this tip needle The part 30 is integrally formed with the connection part 32 coaxially and solidly formed. The connecting portion 32 is formed in a cylindrical shape and is disposed in a state of being separated from the intermediate portion 26 by a predetermined distance D in the axial direction, and in the front (tip side) of the intermediate portion 26 It is integrally connected by the connection stem 34 of a book.

The connecting stems 34 are disposed equiangularly in this embodiment, and the gap defined between the connecting portion 32 and the middle portion 26 is 4 along the circumferential direction by the connecting stems 34. Divided into three. As a result, the drug solution extracted from the outlet opening 14E formed on the tip end surface of the intermediate portion 26 passes radially through the space between the pair of connecting stems 34 adjacent to each other, ie, radially outward. Will be poured out.

  Further, the connection portion 32 is formed to have an outer diameter dimension smaller than the inner diameter dimension of the third flow passage 14C of the drug solution channel 14 located in the intermediate portion 26. Specifically, the outer diameter dimension of the connection portion 32 is extremely set to 0.2 mm in this embodiment. Further, the separation distance D is set to 0.86 mm in this embodiment. As a result, in combination with the separation distance D, the pouring space of the outlet opening 14E is secured in a sufficient size, and the smooth pouring of the chemical solution from the outlet opening 14E is surely ensured.

  Here, each of the above-described connection stems 34 connects the outer surface 34A continuously extending in the axial direction from the outer peripheral surface of the intermediate portion 26, and the tip edge of the outer surface 34A and the outer peripheral surface of the connecting portion 32. And an inclined surface 34B. As described above, since the distal end portion 24 and the intermediate portion 26 are firmly connected via the four connection stems 34, the integral structure of the distal end portion 24 and the intermediate portion 26 is reliably ensured. become.

  Further, since the distal end needle portion 30 constituting the distal end portion 24 of the needle portion 22 described above constitutes one of the features of the present invention, in particular, with reference to FIGS. 10 and 11, explain. That is, in this embodiment, the distal end needle portion 30 has a triangular bottom surface and a triangular pyramid having three triangular slopes 36, 38 and 40 which rise from the bottom surface to the tip end of the distal end needle portion 30. It has a shape. The apex of this triangular pyramidal tip needle portion 30 constitutes a needle tip S as a sharp tip. On the other hand, the three apexes X, Y, Z of the bottom surface of the tip needle portion 30 are located on the tip outer peripheral edge C of the connection portion 32. That is, the bottom surface of the distal end needle portion 30 is virtually located on the distal end surface of the connection portion 32.

  In addition, the first and second inclined surfaces 36, 38 of the distal end needle portion 30 intersect perpendicularly with the distal end surface of the connection portion 32, respectively, and have a predetermined first acute angle θ1 (for example, in this embodiment) , And 17.6 °), and the intersecting lines form a first oblique side α at the vertex X which extends continuously from the outer peripheral surface of the connecting portion 32 along the axial direction without any step. doing. In other words, the first oblique side α is orthogonal to (through) the apex X with respect to the tip surface of the connection portion 32.

  The third inclined surface 40 is inclined at a predetermined second acute angle θ2 (for example, 15 ° in this embodiment) with respect to the vertical axis orthogonal to the distal end surface of the connection portion 32, and the distal end needle portion The 32 needle tips S intersect the first oblique side α. The second oblique side β is defined by the intersection line of the third slope 40 and the first slope 36, and the third oblique side γ is defined by the intersection line of the third slope 40 and the second slope 38. The second and third oblique sides β and γ intersect at the tip of the tip needle portion 30 to form the sharp needle tip S described above.

  Further, as shown in FIGS. 8 and 9, the distal end portion 24 constituting the needle portion 22 includes a tapered portion 42 disposed between the distal end needle portion 30 and the connection portion 32. The tapered portion 42 has a conical tapered surface that connects the bottom side of the distal end needle portion 30 and the outer peripheral edge of the distal end surface of the connecting portion 32. As a result, each bottom side of the distal end needle portion 30 exhibits an arc line at the junction with the tapered portion 42. The taper angle of the tapered portion 42 is set larger than the inclination angle of the third slope 40 with respect to the vertical axis.

  As described above, since the distal end needle portion 30 is provided with the taper portion 42 having a taper angle set larger than the inclination angle of the needle tip S in a state following the sharp needle tip S, this needle portion In a state where the fine needle tips S of 22 are punctured by the skin of the human body, the puncture resistance is suppressed extremely low, and thereby the pain felt by the human body can be effectively suppressed, and the subsequent taper portion 42 is a skin The connection portion 32 connected thereto is punctured into the skin smoothly. As a result, even in a situation where the injection needle 16 is molded to a very thin outer dimension of 0.2 mm with a synthetic resin, the tip 24 is formed in a solid shape and no opening is formed here, so that the whole as a whole is sufficient. Good strength will be secured.

  The syringe 10 with an injection needle configured as described above is set so that the outer diameter thereof gradually becomes smaller, that is, it becomes thinner with respect to the extraction direction of the injection molding die not shown, and is offset Since it does not have the part that has been made, it can be integrally molded from a synthetic resin by an injection molding apparatus (not shown) and manufactured as one part. The synthetic resin used herein is formed of a synthetic resin having high strength, wear resistance, high gas barrier property and solvent resistance and further having biodegradability, and more specifically, poly Glycolic acid (PGA) resins are used.

  As described above, although the syringe 10 with an injection needle is formed from PGA resin so that it is designed to have sufficient bending resistance, the injection needle 16 is temporarily transferred to the human skin for some reason. PAG resin has high strength, abrasion resistance, high gas barrier property and solvent resistance, as described above, and it is characterized by biodegradability, even if it is broken at the time of puncturing and remains in the body. Therefore, it will be disintegrated and disappear in the body, and adverse effects on the living body due to broken of the injection needle can be suppressed as much as possible.

  The case of subcutaneous injection using the syringe 10 with a needle configured as described above as a syringe will be described below.

  First, this syringe is configured by combining the syringe 10 with a needle and a plunger not shown, and basically, it is suitable for being used as a disposable (disposable) syringe, and as a syringe Prior to use, a plunger (not shown) is inserted from one open end face 12A of the syringe body 12, and the inside of the syringe body 12 is filled with a drug solution.

  Next, the case of a subcutaneous injection in which the injection needle 16 is inserted vertically into the skin of the human body and the subcutaneous tissue of the skin is injected with a drug solution will be described. First, a plunger (not shown) is slightly pushed in to exhaust air remaining in the syringe body 12. Note that this residual air evacuating operation may have already been carried out at the time of manufacture of the syringe 10, and in this case becomes unnecessary.

  Thereafter, the injection needle 16 is inserted vertically into the epidermis of the skin, and the needle tip S is inserted through the dermis until it reaches the subcutaneous tissue. Here, the thickness of the epidermis is generally about 0.06 to 0.2 mm, and the thickness of the dermis is generally about 2.0 to 2.2 mm. In other words, the subcutaneous tissue is located at a depth of 2.06-2.4 mm from the surface of the skin.

  On the other hand, the injection needle 16 of the syringe 10 of this embodiment is a solid that includes the needle tip S and has a structure of the tip 24 as a portion to be inserted into the skin first, and no opening is formed here. Therefore, the tip portion 24 has a sufficient strength even though the outside diameter dimension of the tip portion 24 is extremely thinly molded from PGA resin to φ 0.2 mm, and the injection needle 16 is stabbed safely. Can be inserted.

  Further, since the distance from the needle tip S to the outlet opening 14E of the drug solution channel 14 is set to 1.55 mm as described above, the injection needle 16 has a depth of 4.0 mm from the needle tip S. By inserting, the outlet opening 14E of the drug solution channel 14 formed on the tip end surface of the intermediate portion 26 constituting the needle portion 22 will be in a state where it has surely entered the subcutaneous tissue. In this inserted state, by pushing in a plunger (not shown), the drug solution in the syringe body 12 is reliably poured out from the outlet opening 14E into the subcutaneous tissue of the skin through the drug solution channel 14.

  As apparent from the above description, in the case of subcutaneous injection into the skin of the human body, in the case of penetration at an inclination angle of about 30 degrees with respect to the surface of the skin, as in a conventional metal injection needle, In this embodiment, the injection needle 16 is inserted vertically into the skin, as compared to the difficulty in positioning the needle tip in the subcutaneous tissue due to the variation of the inclination angle and the like. Therefore, it is possible to inject the drug solution into the subcutaneous tissue very easily and surely.

  Specifically, as in the case of a conventional metal injection needle, when the needle is inserted vertically into the skin, the needle tip is formed to have an oblique oval shape. The axial length of the opening sometimes exceeds the thickness of the subcutaneous tissue. In such a state, when the drug solution is poured out from the elliptical opening, the drug solution may not only penetrate into the subcutaneous tissue but also into the upper dermis and the lower layer subcutaneous fat, which is not preferable. Thus, in a conventional metal injection needle, it is quite difficult to ensure that the oval opening of the needle is positioned in the subcutaneous tissue.

  Compared with this, the outlet opening 14E as a liquid injection port of the medical fluid in the injection needle 16 of this embodiment is formed on the end face of the middle portion 26 of the needle portion 22 constituting the injection needle 16 orthogonal to the axial direction. ing. Therefore, by precisely defining the penetration depth of the injection needle 16, the insertion position of the outlet opening 14E can be very accurately defined, and as a result, the outlet opening 14E can be reliably positioned in the subcutaneous tissue. It will be possible to achieve the specific effects that will result in the correct injection being performed.

  Needless to say, the present invention is not limited to the applications, configurations and numerical values of the above-described embodiment, and various changes and modifications can be made without departing from the scope of the present invention.

  Also, in the embodiment described above, the injection needle 16 of the syringe 10 with injection needle is described as being used for puncturing the skin of the human body, but the present invention is not limited to such use. Needless to say, it can also be used as a use to puncture the skin of livestock such as pigs, cows and horses.

  In the above-described embodiment, the outer diameter of the tip portion 24 of the injection needle 16 of the syringe 10 with an injection needle is φ 0.2 mm, but this is an example and is limited to this value. For example, in the range of 0.08 mm to 0.8 mm for the human body, the structure is extremely thin, but it may be an outside diameter size exceeding this, or for livestock So long as it has an outer diameter of about 0.5 mm to 2 to 3 mm, and particularly in the case of a pig, since the skin is hard and thick, it is manufactured as an injection needle with an outer diameter larger than this. It is also a thing. Even in this case, since the tip end portion 24 of the injection needle 16 is formed solid, it is possible to exert a specific effect that enables strong skin to reliably puncture hard skin. .

  Further, in the embodiment described above, four connecting stems 34 are described, but the present invention is not limited to such numerical values, and the number of arrangement thereof is not limited, and may be one. Also, as shown in the first modification of the embodiment described above with reference to FIGS. 12 and 13, two may be provided. In the following description, the same parts as those of the above-described embodiment are designated by the same reference numerals, and the description thereof is omitted.

  Further, the number of arrangement of the connection stem 34 may not be four or two, and may be three, in short, the connection portion 32 and the middle portion 26 are connected by at least one connection stem. It is good. For example, FIG. 14 shows the structure of the second modified example in the case where one connecting stem 34 is provided, but as shown in FIG. When providing one connecting stem 34 and defining a gap between the connecting portion 32 and the middle portion 26 in order to facilitate die-cut without offset in the case of the connecting stem 34, Although it is essential to provide one space P which is provided and penetrates along the axial direction, the drug solution coming out of the outlet opening 14E can be poured radially along the subcutaneous tissue through this space P. Become.

  In the above-described embodiment, although the external dimensions, the inner diameter, the inclination angle, the crossing angle, and the like of each part have been described using respective numerical values, the present invention is not limited to such numerical values at all. Needless to say.

  Further, in the embodiment described above, the shape of the distal end needle portion 30 is such that the oblique side α is orthogonal to the distal end surface of the connection portion 32, in other words, the apex defining the needle tip S is a triangular base. Although it has been described that it is not an equilateral triangular pyramid directly above the central position but an oblique triangular pyramid, the present invention is not limited to such a shape, and the present invention is not limited to such a shape. It is needless to say that it may be conical as shown in the third modification of the distal end needle portion 30 in FIG.

  Further, in the above-described embodiment, the shape of the distal end needle portion 30 has been described as a triangular pyramid shape, and the three slopes are configured from triangular flat surfaces, but the present invention is limited to such shapes. Alternatively, it may be configured as a combination of a curved surface and a flat surface. In this case, when the slopes adjacent to each other are flat, the hypotenuse defined from the line of intersection thereof is a line segment consisting of straight lines, and in the case of curved surfaces and flat surfaces or curved surfaces, their intersections. The hypotenuse defined from the line is a curved line segment. In both cases, when the tip needle portion 30 is punctured into the skin, the punctured portion of the skin is cut and penetrated into the inside, but in relative comparison, the curve has a "sharpness" rather than a straight line Although it is a good one, even if it is a triangular pyramid having a straight oblique side, the puncture resistance is sufficiently small, and the pain when the injection needle 16 is punctured is reduced as much as possible. It is possible.

  Further, in the above-described embodiment, it has been described that each oblique side of the triangular pyramid shape of the distal end needle portion 30 is composed of smooth line segments, whether it is a straight line or a curved line. Without being limited to such a shape, for example, as shown in FIG. 16 as a fourth modification of the distal end needle portion 30, it may be provided with a so-called "knurled" line segment having a large number of corner portions. Needless to say. By constructing the hypotenuse from the jagged lines in this manner, the contact portion with the skin can be set to be superchargingly small, thereby giving pain compared to the case of a smooth line segment such as a straight line or a curve. It is possible to achieve the unique effect that it can be reduced as much as possible.

  Further, in the above-described embodiment, the case where the injection needle 16 of the syringe 10 with an injection needle pierces the skin and performs subcutaneous injection has been described, but the present invention is not limited to such a case. A drug solution can be poured out to the dermis constituting the skin, and in this case, the insertion depth of the injection needle 16 may be made shallow as compared with the case where the drug solution is poured out to the subcutaneous tissue. However, since the injection needle 16 of this embodiment allows the insertion depth to be easily set freely, the injection destination (target) of the drug solution exiting from the outlet opening 14E must be in the subcutaneous tissue and in the dermis. Also, it can be set freely, whether in muscle.

  In the above-described embodiment, the gap D (the distance between the intermediate portion 26 and the connecting portion 32) has been described to be a predetermined value, but the present invention is limited to such a configuration. It is needless to say that the gap D can be set to zero (ie, zero). In this case, the drug solution from the outlet opening 14E is poured into the body from the ring-shaped space based on the difference in diameter between the intermediate portion 26 and the connection portion 32.

  In the above-described embodiment, polyglycolic acid (PGA) resin is used as the material of the syringe 10 with a needle, but the present invention is not limited to the use of such a material. The point is that it can be integrally molded by injection molding, and it goes without saying that anything may be used as long as it matches the quality and performance used as a medical device. For example, polyvinyl chloride, low density polyethylene, high density polyethylene, polypropylene, acrylonitrile / butadiene / styrene copolymer resin, polycarbonate, polyethylene terephthalate etc. widely known as medical plastics, and various thermoplastic elastomers, etc. It goes without saying that special plastics such as polystyrene, polysulfone and silicone can be used.

Industrial applicability

  As described above in detail, according to the present invention, a syringe with an injection needle is manufactured in one piece by using injection molding technology from synthetic resin in a state in which a fine injection needle is integrally attached to a syringe body. As well as being able to achieve cost reduction, the puncture resistance of the injection needle can be set as small as possible to reduce pain at the time of puncture, and furthermore, even if the injection needle is finely Even if formed, sufficient strength is secured, and the safety can be ensured, so that a synthetic resin injection needle that can be effectively used in medical fields such as hospitals and clinics is provided, and the use thereof Sex is immeasurable.

DESCRIPTION OF SYMBOLS 10 Syringe with injection needle 12 Syringe main body 12A One end face 12B Other end face 12C Communication hole 14 Chemical solution flow path 14A 1st flow path 14B 2nd flow path 14C 3rd flow path 14D Tapered throttle part 14E Exit opening 16 Injection needle 18 Flange 20 Base end 22 Needle part 24 Tip part 26 Intermediate part 28 Base 30 Tip needle part 32 Connection part 34 Connecting stem 34A Outer surface 34B Inclined surface 36 1st slope 38 2nd slope 40 3rd slope 42 Taper portion C Outer peripheral edge D of the connection portion 32 A separation distance between the intermediate portion 26 and the connection portion 32 P space S needle tip X, Y, Z vertex α, β, γ oblique side θ 1 first predetermined acute angle θ 2 second Predetermined acute angle

Claims (15)

A syringe body made of a synthetic resin, which is formed of a hollow cylinder having one open end face, and a plunger is inserted from the open end face in a fluid-tight manner;
Wherein comprising a liquid medicine passage communicating with the syringe body, comprising a needle made integrally molded synthetic resin on the other end surface of the syringe body,
The injection needle is integrally formed of a proximal end attached to the syringe body and a needle having a sharpened tip, and is formed of a synthetic resin.
The needle portion is integrally molded and a distal portion, an intermediate portion and a base portion, wherein the tip is a tip needle portion formed in the intermediate circumstances have the needle tip, coaxially to said distal needle portion And the connection portion formed in a solid shape is integrally formed, and the drug solution channel is formed in a state of penetrating the inside of the base end portion and the base portion and the intermediate portion of the needle portion The connection portion is formed so as not to open at the front end portion but to open at the front end surface of the middle portion , the connection portion is disposed in a state of being separated from the middle portion, and a plurality of connection stems at the front end of the middle portion A syringe with a needle, characterized in that they are integrally connected .   The injection needle according to claim 1, wherein the inner diameter of the drug solution channel at the proximal end is set equal to the inner diameter of the communication hole formed in the other end face of the syringe body. Syringe.   The injection needle according to claim 1, wherein the inside diameter of the medical fluid channel at the proximal end is set smaller than the inside diameter of the communication hole formed in the other end face of the syringe body. With syringe. The syringe with a needle according to claim 1, wherein the connection portion is formed in a cylindrical shape . The base end face of the connecting portion and the tip end face of the middle portion are separated by a predetermined distance in the axial direction to form a gap, and the chemical solution poured out from the outlet opening is adjacent to each other via the gap. The syringe with a needle according to claim 1 , wherein the syringe is poured radially through between the connecting stems . The connection stem includes an outer surface continuously extending in the axial direction from an outer peripheral surface of the intermediate portion, and an inclined surface connecting a tip edge of the outer surface and an outer peripheral surface of the cylindrical body portion. The syringe with a needle according to claim 5 . The syringe with a needle according to claim 5 , wherein the connection stems are disposed equiangularly along a circumferential direction . The coupling stem is provided two, outer periphery of the gap, the injection syringe with a needle according to claim 1, characterized in that it is divided into two parts by the coupling stem. The syringe with a needle according to claim 1 , wherein the connecting stem is provided in four pieces, and the outer periphery of the gap is divided into four by the connecting stem . The apical needle portion has a triangular or substantially triangular pyramid shape or a substantially triangular pyramid shape having a triangular or substantially triangular bottom surface and three triangular or substantially triangular slopes rising from the bottom surface toward the tip of the apical needle portion injection syringe with a needle according to claim 1 that is characterized in being formed. Among the three bevels of the tip needle portion, the first and second bevels respectively stand vertically to the tip surface of the cylindrical body portion, intersect each other at a predetermined first acute angle, and mutually The first cross section of the first slope side extends continuously in the axial direction from the outer peripheral surface of the cylindrical body portion without any step, and the third slope is formed on the tip end surface of the cylindrical body portion. It inclines at a predetermined second acute angle with respect to the perpendicular vertical axis, and intersects the first oblique side at the tip of the tip needle portion, and intersects the third slope and the first slope. A second oblique side is defined by the intersection line, a third oblique side is defined by the intersection line of the third slope and the second slope, and the second and third oblique sides are the tips of the tip needle portion. The syringe with a needle according to claim 10 , characterized in that they intersect at the needle tip . The syringe with a needle according to claim 1 , wherein the tip needle portion is formed in a conical shape . The tip portion includes a tapered portion disposed between the tip needle portion and the connection portion, and the taper portion is a cone connecting the bottom side of the tip needle portion and the tip outer peripheral edge of the connection portion. The syringe with a needle according to claim 12, characterized in that it has a tapered surface . The syringe with an injection needle according to claim 13 , wherein a bottom side of the distal end needle portion comprises at least a circular arc-like line segment at a junction with the tapered portion . 15. The syringe with a needle according to claim 14 , wherein the apex of the bottom surface of the tip needle portion is located on the tip outer peripheral edge of the cylindrical body portion .