JP2018093906A - Liquid medicine injection device and injection needle used for the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid medicine injection device that enables liquid medicine to be injected without wasting liquid medicine even when a space is generated between an injection syringe and an injection needle, and an injection needle used for the device.SOLUTION: An injection syringe 10 and an injection needle 30 are configured so that a space is generated between the injection syringe 10 and the injection needle 30 when the injection needle 30 is attached to the tip of the injection syringe 10. The injection needle 30 includes a hub 31 for receiving the tip of the injection syringe 10, at least one needle 33 protruding from the tip of the hub 31, and a filler 40 to fill at least part of the space. The filler 40 is configured so that when the injection needle 30 is attached to the tip of the injection syringe 10, liquid medicine put in a chamber 13 of the injection syringe 10 flows into a hollow part of the at least one needle 33 through at least one through-hole 41 of the filler 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drug solution injection device for injecting a drug solution into a patient and an injection needle used in the device.

  Conventionally, as a method of detachably connecting a syringe and a syringe needle, a syringe-like device is formed by frictionally engaging a tapered convex portion provided at the tip of the syringe and a tapered concave portion provided in a hub of the syringe needle. There is known a method (a luer lock type) for detachably connecting an injection needle (for example, see Patent Document 1). This method is useful in that an excellent sealing property can be realized between the syringe and the injection needle, but in order to realize such a sealing property, a tapered convex portion provided at the tip of the syringe is used. Since the diameter of the portion needs to be slightly larger than the diameter of the tapered concave portion provided in the hub of the injection needle, a space is inevitably generated between the tapered convex portion and the tapered concave portion. Become. Since the chemical solution injection device cannot inject the chemical solution in this space, the problem that this space becomes a dead space has been known. When injecting expensive chemicals such as biotechnology drugs, the cost of chemicals lost due to this dead space cannot be ignored. For this reason, when injecting an expensive drug solution, the conventional taper-shaped convex portion provided at the tip of the syringe and the tapered concave portion provided at the hub of the injection needle are frictionally engaged. By adopting a method for detachably connecting the syringe and the injection needle (a luer lock type), a countermeasure for avoiding the occurrence of the above-described problem itself has been taken (for example, Patent Document 1). reference).

Japanese Patent No. 4328064

  The present invention has been made in order to solve the above-mentioned problem by an approach different from the conventional one, and injects a chemical solution without wasting the chemical solution even when a space is generated between the syringe and the injection needle. It is an object of the present invention to provide a drug solution injection device and an injection needle used in the device.

  The syringe of the present invention is a syringe needle that is detachably attached to a tip portion of a syringe, and the syringe and the syringe needle are provided when the syringe needle is attached to the tip portion of the syringe. A space between the injection needle and the injection needle, the injection needle including a hub for receiving the tip of the syringe, and at least one needle protruding from the tip of the hub; A filling for filling at least a portion of the space, each of the at least one needle has a hollow portion, the filling has at least one through hole, and the filling is When the injection needle is attached to the tip portion of the syringe, the liquid medicine filled in the syringe chamber passes through the at least one through-hole of the filling and the small amount Both are configured to flow in each of the hollow portion of one needle.

  In one embodiment of the present invention, the distal end portion of the syringe is provided with a tapered convex portion, and the hub is frictionally engaged with the tapered convex portion provided at the distal end portion of the syringe. The tapered recess is formed, and the space is formed by frictional engagement between the tapered protrusion and the tapered recess.

  In one embodiment of the present invention, the filling may include a compressible material.

  In one embodiment of the invention, the material may be silicon rubber.

  In one embodiment of the present invention, the filler is configured to compressively deform within the space.

  In one embodiment of the present invention, the tapered concave portion may have at least one fitting convex portion that fits into the at least one through hole of the filler.

  In one embodiment of the present invention, a distal end portion of the syringe is provided with a drug solution outlet for leading the drug solution filled in the chamber to the syringe, and the at least one through hole of the filler is provided. The inner diameter of each of the at least one needle is configured to be larger than the inner diameter of each hollow portion and smaller than the inner diameter of the drug solution outlet portion.

  The chemical solution injection device of the present invention is a chemical solution injection device for injecting a chemical solution, and the chemical solution injection device includes a syringe and an injection needle that is detachably attached to a distal end portion of the syringe, A chamber filled with a medicinal solution, wherein the injection needle fills at least a portion of the space, a hub for receiving the tip of the syringe, at least one needle protruding from the tip of the hub Each of the at least one needle has a hollow portion, the filler has at least one through-hole, and the filler has the injection needle attached to the syringe. When attached to the tip, the medicinal solution filled in the chamber of the syringe passes through the at least one through-hole of the filling to that of the at least one needle. And it is configured to flow into the hollow portion of the record.

  ADVANTAGE OF THE INVENTION According to this invention, even when a space arises between a syringe and an injection needle, the chemical | medical solution injection | pouring apparatus which makes it possible to inject | pour a chemical | medical solution without wasting a chemical | medical solution, and the injection needle used for the apparatus are provided. It is possible.

The exploded longitudinal cross-sectional view of the chemical injection device 100 in a state where the chemical injection device 100 of one embodiment of the present invention is disassembled A longitudinal sectional view of an engaging portion between the syringe 10 and the injection needle 30 in a state where the injection needle 30 is attached to the distal end portion of the syringe 10 The longitudinal cross-sectional view of the injection needle 30 of one embodiment of this invention The longitudinal cross-sectional view of the injection needle 30 of one embodiment of this invention

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

  FIG. 1 is an exploded longitudinal sectional view of a chemical liquid injector 100 in a state where the chemical liquid injector 100 according to one embodiment of the present invention is disassembled.

  The medicinal solution injection device 100 includes a syringe 10 and an injection needle 30 that is detachably attached to a distal end portion of the syringe 10.

  The syringe 10 includes a syringe 12 having a chamber 13 that is filled with a chemical solution, and a plunger 20 that is inserted into the chamber 13 of the syringe 12.

  A tapered convex portion 11 is provided at the distal end portion of the syringe 12 (that is, the distal end portion of the syringe 10).

  The distal end portion of the chamber 13 communicates with a chemical solution outlet portion 14 formed in the tapered convex portion 11. An open port 15 is provided at the rear end of the chamber 13.

  The plunger 20 is configured to be inserted into the chamber 13 through the opening 15. The plunger 20 is movable along the longitudinal axis of the syringe 12. A piston 21 is joined to the plunger 20. As the plunger 20 moves along the longitudinal axis of the syringe 12, the piston 21 also moves along the longitudinal axis of the syringe 12.

  An operation unit 22 is provided at the rear end of the plunger 20. By pulling the operation unit 22, it is possible to perform an operation of pulling the plunger 20 with respect to the syringe 12. It is possible to perform an operation of pushing the plunger 20 with respect to the syringe 12 by pushing the operation unit 22.

  A protrusion 23 is provided at the tip of the plunger 20. When the plunger 20 moves to the tip of the chamber 13, the protrusion 23 functions to shield the space of the chemical solution outlet 14 formed in the tapered convex portion 11. Thereby, it is possible to significantly reduce the amount of the chemical liquid remaining in the space of the chemical liquid outlet 14 without being supplied to the injection needle 30 (see FIG. 2).

  The chemical | medical solution derivation | leading-out part 14 is a circular hole, for example. In this case, the chemical solution outlet 14 may have an arbitrary inner diameter. In one embodiment, although the internal diameter of the chemical | medical solution derivation | leading-out part 14 is about 1.5 to about 2.5 mm, this invention is not limited to this. However, the chemical | medical solution derivation | leading-out part 14 is not limited to a circular hole. The chemical solution outlet 14 may be a hole having an arbitrary shape other than the circular hole. For example, the chemical | medical solution derivation | leading-out part 14 may be a triangular hole, a polygonal hole more than a quadrangle | tetragon, and an elliptical hole may be sufficient as it.

  FIG. 2 is a vertical cross-sectional view of an engaging portion between the syringe 10 and the injection needle 30 in a state where the injection needle 30 is attached to the distal end portion of the syringe 10.

  The injection needle 30 includes a hub 31 and a needle 33 that protrudes from the distal end portion of the hub 31. The hub 31 has a tapered recess 32. The tapered concave portion 32 is configured to frictionally engage with the tapered convex portion 11 provided at the distal end portion of the syringe 12. Here, in order to achieve high sealing performance between the syringe 10 and the injection needle 30 in order to prevent leakage of the drug solution to the outside, the tapered convex portion 11 provided at the distal end portion of the syringe 12 It is necessary to make the size (for example, the outer diameter of the convex portion 11) equal to or slightly larger than the size of the tapered concave portion 32 (for example, the inner diameter of the concave portion 32) provided in the hub 31 of the injection needle 30. There is. For this reason, a space is inevitably generated between the tapered convex portion 11 and the tapered concave portion 32. Since the chemical injection device 100 cannot inject the chemical in this space, this space is a dead space. The injection needle 30 has at least a part of this dead space (that is, a space generated between the tapered convex portion 11 and the tapered concave portion 32 when the injection needle 30 is attached to the distal end portion of the syringe 10). It further includes a filling 40 for filling the.

  The shape of the tapered concave portion 32 may be any shape as long as it can be frictionally engaged with the tapered convex portion 11 provided at the distal end portion of the syringe 10. In one embodiment, from the viewpoint of manufacturing cost, engagement accuracy, and the like, the shape of the tapered recess 32 is preferably a substantially conical shape, but the present invention is not limited to this. For example, the shape of the tapered recess 32 may be a triangular pyramid or a quadrangular pyramid. In one embodiment, the inner diameter of the tapered recess 32 is about 3-4 mm at the tip, but the present invention is not limited thereto.

  In the embodiment shown in FIGS. 1 and 2, the distal end portion of the syringe 12 is provided with a tapered convex portion 11 (for example, a luer lock type convex portion), and the hub 31 of the injection needle 30. Although an example in which a tapered recess 32 (for example, a luer lock type recess) is provided has been described, the present invention is not limited to this. When the injection needle 30 is attached to the distal end portion of the syringe 10, the convex portion 11 and the concave portion 32 may have any shape as long as a space is generated between the convex portion 11 and the concave portion 32. For example, the convex portion 11 may be a male screw-shaped convex portion (for example, a luer tip type convex portion), and the concave portion 32 may be a female screw-shaped concave portion (for example, a luer tip type concave portion). Good. As long as it includes a filling 40 for filling at least a part of a space (dead space) formed between the convex portion 11 provided at the distal end portion of the syringe 12 and the concave portion 32 provided in the hub 31 of the injection needle 30. The injection needle 30 including such a filling 40 is within the scope of the present invention, and the liquid injector 100 including such an injection needle 30 is within the scope of the present invention.

  The material of the filling 40 can be any material. In one embodiment, the material of the filler 40 is preferably a compressible material. For example, the compressible deformable material is selected from the group consisting of silicon rubber, fluororubber, nitrile rubber, butyl rubber, urethane rubber, fluororubber, natural rubber, elastomer, and elastomer material. By forming at least a part of the filling 40 from a material that can be compressed and deformed, it occurs between the convex portion 11 and the concave portion 32 when the convex portion 11 of the syringe 10 and the concave portion 32 of the hub 31 are engaged. Even if a difference occurs in the size of the space (dead space), the dead space can be suitably filled by compressing and deforming the filling 40. Thereby, it is possible to reduce the amount of the chemical solution that remains in the dead space without being supplied to the needle 33. In other embodiments, the material of the filler 40 may be a plastic or metal that is not compressed and deformed.

  The shape and size of the filling 40 is such that at least a part of a space (dead space) generated between the convex portion 11 and the concave portion 32 when the convex portion 11 of the syringe 10 and the concave portion 32 of the hub 31 are engaged. Can be of any shape and size as long as it can be filled. In one embodiment, as shown in FIG. 2, the filling 40 is a cylindrical body having a size that almost completely fills a space (dead space) generated between the convex portion 11 and the concave portion 32. However, the present invention is not limited to this. For example, the shape of the filling 40 may be a triangular cylinder or a polygonal cylinder such as a square cylinder. Moreover, the size of the filling 40 may be smaller than the size of the dead space. In one embodiment, the shape and size of the filler 40 is, for example, a cylindrical body having an outer diameter of about 3 to 5 mm and a height of about 3 to 5 mm.

  The filling 40 has a through hole 41. The through hole 41 is configured to communicate the drug solution outlet portion 14 of the syringe 10 and the hollow portion of the needle 33. Thereby, the drug solution filled in the chamber 13 of the syringe 10 can be supplied to the hollow portion of the needle 33 through the drug solution outlet 14 of the syringe 10 and the through hole 41 of the filler 40. The chemical solution supplied to the hollow portion of the needle 33 is injected into the patient's body.

  In the embodiment shown in FIGS. 1 and 2, the example in which the number of the needles 33 is one and the number of the through holes 41 of the filler 40 is one has been described, but the present invention is limited to this. Not. The number of needles 33 can be any number. The number of through holes 41 can also be any number. For example, as shown in FIG. 3, three through holes 41 (the same number as the number of needles 33) may be provided for the three needles 33. Alternatively, as shown in FIG. 4, one through hole 41 may be provided for three needles 33 (less than the number of needles 33).

  The size (for example, inner diameter) of the through hole 41 may be any size (for example, inner diameter) as long as the drug solution outlet portion 14 of the syringe 10 and the hollow portion of the needle 33 can communicate with each other. In one embodiment, the inner diameter of the through hole 41 is preferably larger than the inner diameter of the hollow portion of the needle 33 and smaller than the inner diameter of the drug solution outlet portion 14. As a result, the drug solution can smoothly flow from the chamber 13 of the syringe 10 to the hollow portion of the needle 33, and the amount of the drug solution remaining in the dead space without being supplied to the hollow portion of the needle 33 can be reduced. It is. However, the present invention is not limited to this. For example, the inner diameter of the through hole 41 may be the same as the inner diameter of the hollow portion of the needle 33, or may be the same as or larger than the inner diameter of the chemical solution outlet portion 14. In one embodiment, the inner diameter of the through hole 41 is, for example, about 0.1 to about 2.5 mm.

  In one embodiment, the through hole 41 may be a circular hole, but the present invention is not limited to this. The through hole 41 may be a hole having an arbitrary shape other than the circular hole. For example, the through hole 41 may be a triangular hole, a quadrilateral or more polygonal hole, or an elliptical hole.

  The filling 40 is fixed in the recess 32 of the hub 31 by a fixing member such as an adhesive in such a manner that the through hole 41 communicates the chemical solution outlet 14 and the hollow portion of the needle 33. Note that the method of fixing the filler 40 in the recess 32 of the hub 31 is not limited to bonding. The filler 40 may be fixed in the concave portion 32 of the hub 31 by using another method such as fusion or press fitting. Further, as shown in FIG. 2, a fitting convex portion 34 that fits into the through hole 41 of the filler 40 may be provided in the concave portion 32. By fitting the through hole 41 of the filler 40 and the fitting convex portion 34, the filler 40 can be firmly fixed to the engaging concave portion 32. In the embodiment shown in FIG. 2, the number of the fitting protrusions 34 is one, but the present invention is not limited to this. The number of fitting convex parts 34 may be one or more arbitrary numbers. For example, the number of fitting protrusions 34 can be any number corresponding to the number of through holes 41.

  The hub 31 is provided with at least one through hole 35 through which at least one needle 33 passes. The through hole 35 is connected to a recess 32 formed in the hub 31. In the embodiment shown in FIG. 2, the number of the through holes 35 is one (the same number as the number of the needles 33), but the present invention is not limited to this. The number of needles 33 and the number of through holes 35 may be any number. For example, when the number of needles 33 is three, three through holes 35 (the same number as the number of needles 33) may be provided, and when the number of needles 33 is five, , Five through holes 35 (the same number as the number of needles 33) may be provided. The needle 33 is fixed in the through hole 35 by a fixing member such as an adhesive in a state where the tip of the needle 33 projects from the tip of the hub 31. The method for fixing the needle 33 in the through hole 35 is not limited to adhesion. The needle 33 may be fixed in the through hole 35 by using another method such as fusion.

  The material of the needle 33 can be any material. In one embodiment, the material of the needle 33 is preferably stainless steel, aluminum, or an aluminum alloy from the viewpoint of manufacturing cost, strength, and the like, but the present invention is not limited to this. For example, the material of the needle 33 may be a metal material such as titanium or a titanium alloy, a plastic material, or the like.

  The material of the hub 31 can be any material. In one embodiment, from the viewpoint of manufacturing cost and the like, the material of the hub 31 is preferably a thermoplastic resin such as polycarbonate, polypropylene, and ABS resin, but the present invention is not limited to this. For example, the material of the hub 31 may be a metal material such as stainless steel. When a thermoplastic resin is used as the material of the hub 31, the hub 31 can be manufactured by injection molding or the like. Alternatively, the metal needle 33 and the hub 31 made of thermoplastic resin may be integrally formed by injection molding or the like.

  The size (for example, the inner diameter) of the hollow portion of the needle 33 can be any size (for example, the inner diameter) based on the type of chemical solution used and the conditions under which the chemical solution is administered. In one embodiment, the inner diameter of the hollow portion of the needle 33 is preferably 0.1 to 0.6 mm, but the present invention is not limited to this. For example, the inner diameter of the hollow portion of the needle 33 may be 0.1 mm, or may be 0.6 mm or more.

  In one embodiment, the hollow part of the needle 33 may be a circular hole, but the present invention is not limited to this. The hollow portion of the needle 33 may be a hole having an arbitrary shape other than the circular hole. For example, the hollow portion of the needle 33 may be a triangular hole, a quadrilateral or more polygonal hole, or an elliptical hole.

  The chemical injection device 100 may include a cap (not shown) that protects the needle 33.

  Next, the usage method of the chemical injection device 100 will be described.

  The convex portion 11 provided at the distal end portion of the syringe 10 and the concave portion 32 provided in the hub 31 of the injection needle 30 are frictionally engaged, whereby the syringe 10 and the injection needle 30 are engaged. Thereby, the assembly of the chemical injection device 100 is completed.

  When the convex portion 11 and the concave portion 32 are engaged with each other, a space (dead space) generated between the convex portion 11 and the concave portion 32 is filled with the filling 40 disposed in the concave portion 32 of the injection needle 30. It is done. Further, the drug solution outlet portion 14 of the syringe 10 and the hollow portion of the needle 33 communicate with each other through the through hole 41 formed in the filling 40.

  When the assembly of the drug solution injector 100 is completed, the tip of the needle 33 is pierced into the patient's body, and the piston 21 joined to the plunger 20 via the operation unit 22 of the syringe 10 is pressed. As a result, the drug solution filled in the chamber 13 of the syringe 10 passes through the drug solution outlet 14 and is supplied to the hollow portion of the needle 33 through the through hole 41 of the filler 40. As a result, the medicinal solution is injected into the patient's body through the hollow portion of the needle 33. By pushing the piston 21, the plunger 20 moves to the front end of the chamber 13, whereby the chemical solution injection action is completed.

  Since the space between the convex portion 11 and the concave portion 32 (dead space) is filled with the filling 40 disposed inside the concave portion 32 provided in the injection needle 30, the hollow portion of the needle 33 The chemical liquid that remains in the dead space without being supplied to is only the chemical liquid retained in the space of the through hole 41. Thereby, it is possible to significantly reduce the amount of the chemical solution remaining in the dead space without being supplied to the hollow portion of the needle 33. Further, by shielding the chemical solution outlet 14 by the projection 23 provided at the tip of the plunger 20, the amount of the chemical remaining in the space of the chemical outlet 14 without being supplied to the hollow portion of the needle 33 is further increased. It is possible to reduce.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention.

  The present invention provides a chemical solution injection device that makes it possible to inject a chemical solution without wasting a chemical solution even when a space is generated between the syringe and the injection needle, and an injection needle used in the device. Useful as.

DESCRIPTION OF SYMBOLS 10 Injection needle 11 Convex part 12 Syringe 13 Chamber 14 Chemical | medical solution derivation | leading-out part 20 Plunger 21 Piston 22 Operation part 23 Protrusion part 30 Injection needle 31 Hub 32 Concave part 33 Needle 34 Fitting convex part 35 Through-hole 40 Filler 41 Through-hole

Claims (8)

An injection needle detachably attached to the tip of the syringe,
The syringe and the injection needle are configured such that a space is generated between the syringe and the injection needle when the injection needle is attached to the distal end portion of the syringe.
The injection needle is
A hub for receiving the tip of the syringe;
At least one needle protruding from the tip of the hub;
A filling for filling at least a part of the space,
Each of the at least one needle has a hollow portion;
The filling has at least one through hole;
When the injection needle is attached to the tip portion of the syringe, the filling is filled with the drug solution filled in the syringe chamber through the at least one through-hole of the filling, and An injection needle configured to flow into each of the hollow portions of one needle. The tip portion of the syringe is provided with a tapered convex portion,
The hub has a tapered recess that frictionally engages with the tapered projection provided at the tip of the syringe;
The injection needle according to claim 1, wherein the space is generated by frictional engagement between the tapered convex portion and the tapered concave portion.   The injection needle according to claim 1, wherein the filling includes a compressible material.   The injection needle according to claim 3, wherein the material is selected from the group consisting of silicon rubber, fluorine rubber, nitrile rubber, butyl rubber, urethane rubber, fluorine rubber, natural rubber, elastomer, and elastomer material.   The injection needle according to any one of claims 1 to 4, wherein the filling is compressed and deformed in the space.   The injection needle according to any one of claims 1 to 5, wherein the tapered recess has at least one fitting protrusion that fits into the at least one through hole of the filling. The tip of the syringe is provided with a drug solution outlet for leading the drug solution filled in the chamber to the syringe,
The inner diameter of each of the at least one through-holes of the filling is larger than the inner diameter of each hollow portion of the at least one needle and smaller than the inner diameter of the drug solution outlet portion. The injection needle according to any one of the above. A chemical injection device for injecting a chemical solution, wherein the chemical injection device is
A syringe,
An injection needle removably attached to the tip of the syringe; and
The syringe includes a chamber filled with a drug solution,
The injection needle is
A hub for receiving the tip of the syringe;
At least one needle protruding from the tip of the hub;
A filling for filling at least a part of the space,
Each of the at least one needle has a hollow portion;
The filling has at least one through hole;
When the filling needle is attached to the tip of the syringe, the filling liquid fills the chamber of the syringe through the at least one through hole of the filling, A chemical injection device configured to flow through the hollow portion of each of the at least one needle.

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