Accidental stick prevention device and syringe assembly

Abstract

To provide an accidental puncture prevention device for safely disposing a needle hub.SOLUTION: An accidental puncture prevention device comprises a hollow tubular body 213, the member used for removing a needle hub 203 fitted to a syringe 205 from the syringe, the hollow tubular body whose inner shape excluding an inner-shape narrow part 211 is larger than an external shape 217 of the needle hub and whose inner shape including the inner-shape narrow part is larger than an external shape 215 of a syringe body. The hollow tubular body is mounted on the outside of the syringe without the needle hub mounted thereon, and the needle hub is fitted to a front end 219 of the syringe with the hollow tubular body mounted thereon. When the needle hub fitted to the syringe is removed from the syringe, the hollow tubular body moves to a front side, so that the inner-shape narrow part and the external shape of the needle hub are fitted, with the entire needle hub including the needle covered with the hollow tubular body. Further, when the hollow tubular body moves to the front side, the needle hub is removed from the syringe with the same covered with the hollow tubular body.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a needle prick prevention device and a syringe assembly using the same. [Background technology]

[0002] In a syringe assembly, the needle remains in the syringe after the drug solution is injected. When disposing of this needle, there is a risk of accidentally sticking a medical professional with the needle. This raises the risk of the medical professional coming into contact with the patient's bodily fluids or blood remaining in the needle and contracting a disease. Furthermore, there is a risk of unintentionally bringing the drug solution remaining in the needle into contact with another person, so care must be taken when disposing of the needle if it contains a dangerous drug solution. Thus, in conventional syringe assemblies, safely disposing of the needle after injecting the drug solution has been an issue.

[0003] Therefore, Patent Document 1 discloses an invention that includes a protective cover for covering the needle of a syringe, and before and after use of the syringe, the tip of the syringe is inserted into the protective cover from its open end to cover the needle, and when using the syringe, the protective cover is pushed further into the syringe to expose the needle from the through-hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-149513 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with this method, when the syringe is discarded, the syringe including the needle hub and syringe is discarded together with the protective cover, resulting in a large volume of waste. If the needle hub and syringe could be separated, the waste would be smaller and safety would be more easily ensured. It would also be easier to separate the waste.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a prick prevention device that separates the needle hub from the syringe, protecting the needle before disposal. [Means for solving the problem]

[0007] The puncture prevention device of the present invention comprises: A member used when removing a needle hub fitted to a syringe from the syringe, a hollow cylindrical body having an inner dimension, excluding a narrowed inner portion, larger than the outer dimension of the needle hub, and an inner dimension, including the narrowed inner portion, larger than the outer dimension of the syringe body; The hollow cylindrical body is attached to the outside of the syringe when the needle hub is not attached, The needle hub is fitted to the front end of the syringe to which the hollow cylindrical body is attached, When the needle hub fitted to the syringe is removed from the syringe, When the hollow cylindrical body moves forward, the inner narrow portion engages with the outer surface of the needle hub in a state where the entire needle hub including the needle is covered by the hollow cylindrical body, Furthermore, by moving the hollow cylindrical body forward, the needle hub is removed from the syringe while being covered by the hollow cylindrical body, thereby providing an accidental prick prevention device. [Effects of the Invention]

[0008] The present invention provides an accidental puncture prevention device that separates the needle hub from the syringe and protects the needle tip before disposal. [Brief explanation of the drawings]

[0009] [Figure 1] 1(a) is a schematic diagram of a syringe assembly according to one embodiment of the present invention, and FIG. 1(b) is a schematic cross-sectional view taken along line AA of FIG. 1(a). [Figure 2] FIG. 1B is an enlarged view of the needle hub and syringe tip of B in FIG. 1B according to one embodiment of the present invention. [Figure 3]FIG. 1 is an enlarged view of the area where a needle hub and a syringe are fitted together in one embodiment of the present invention, and is a view illustrating the inner diameter of the needle, the outer diameter of the needle, the diameter of the needle hole, the diameter of the needle holder portion of the needle hole, and the diameter of the drug solution passage hole. [Figure 4] 4(a) is a schematic diagram of a syringe assembly equipped with a puncture prevention device according to one embodiment of the present invention, and FIG. 4(b) is a schematic cross-sectional view taken along CC in FIG. 4(a). [Figure 5] 5(a) is a schematic diagram of a syringe assembly in which a puncture prevention device is engaged with a needle hub, and FIG. 5(b) is a schematic cross-sectional view taken along the line DD of FIG. 5(a) according to one embodiment of the present invention. [Figure 6] 6(a) is a schematic diagram showing a state in which a needle hub has been removed from a syringe using a puncture prevention device according to one embodiment of the present invention, and FIG. 6(b) is a schematic cross-sectional view taken along the line EE of FIG. 6(a). DETAILED DESCRIPTION OF THE INVENTION

[0010] Various embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the syringe assembly described below is intended to embody the technical concept of the present disclosure, and unless otherwise specified, the present disclosure is not limited to the following. For ease of explanation or understanding of the main points, the same reference numerals are used in Figures 1 to 3 and Figures 4 to 6 for convenience. In particular, similar functions and effects due to similar configurations will not be mentioned sequentially in each embodiment or example. The size and positional relationship of components shown in each drawing may be exaggerated for clarity of explanation.

[0011] (First Syringe Assembly) Fig. 1 is (a) a schematic diagram of a syringe assembly according to one embodiment of the present invention, and (b) a schematic cross-sectional view taken along line AA in Fig. 1(a). Fig. 2 is an enlarged view of the needle hub shown in B in Fig. 1(b) and the tip of a syringe according to one embodiment of the present invention. Fig. 3 is an enlarged view of the engagement between the needle hub and syringe according to one embodiment of the present invention, illustrating the inner diameter of the needle, the outer diameter of the needle, the diameter of the needle hole, the diameter of the needle holder of the needle hole, and the diameter of the drug solution passage hole. The syringe assembly of the present invention will be described with reference to Figs. 1 to 3.

[0012] In this specification, the needle side of the syringe, i.e., the side from which the medicinal solution comes out, is defined as the front side, and the side into which the plunger is inserted and into which the medicinal solution is refilled is defined as the rear side. As shown in Figures 1(a) and 1(b), a first syringe assembly 101 of the present invention includes a needle hub 103 having a needle 109 and fitted to the front end of a syringe 105, the syringe 105 having a medicinal solution storage space 117, and a plunger 107 that pushes the medicinal solution out of the rear side 115 of the syringe.

[0013] As shown in FIG. 2, the syringe 105 has a generally cylindrical or generally frustum-shaped fitting portion 113 at its front end. The fitting portion 113 is a portion that fits into a recess 111 of the needle hub 103, which will be described later. The fitting portion 113 may be cylindrical or polygonal, as long as its shape matches the recess 111. The fitting portion 113 may also be frustum-shaped or polygonal frustum-shaped. If the fitting portion 113 is frustum-shaped, tapering toward the front end, this is preferable because it makes it easy to fit and remove the needle hub 103. In particular, if the fitting portion 113 is frustum-shaped, this is preferable because there is no directionality when fitting and it can be fixed from any direction.

[0014] Fitting portion 113 is provided with a liquid medicine passing hole 123 that extends in the front-to-rear direction and has a substantially circular cross-sectional shape. Liquid medicine passing hole 123 is in fluid communication with liquid medicine storage space 117, and allows the liquid medicine to pass when plunger 107 is pushed forward. As will be described later, liquid medicine passing hole 123 has a circular cross section, and its diameter Φ5 is equal to or slightly larger than the inner diameter Φ1 of the needle and smaller than the outer diameter Φ2 of the needle.

[0015] 2, the needle hub 103 has a recess 111 formed at its rear end to fit into a fitting portion 113 of the syringe 105. The shape of the recess 111 is preferably the same as the shape of the fitting portion 113. This increases the friction between the needle hub 103 and the syringe 105, and enables the needle hub 103 and the syringe 105 to be fixed together.

[0016] As shown in FIG. 3 , the needle hub 103 is provided with a needle hole 137, into which the needle 109 is attached, located forward of the recess 111. The needle hole 137 has a circular cross section. The diameter Φ3 of the needle hole 137 is equal to the outer diameter Φ2 of the needle, or slightly larger than the outer diameter Φ2 of the needle 109 because adhesive is sandwiched between the needle hole 137 and the needle 109. The rear end of the needle hole 137 is provided with a needle hole needle holder 139, in which the diameter Φ3 of the needle hole 137 is smaller. The needle 109 is inserted into the needle hole 137, and the rear end of the needle 109 abuts against the front end of the needle hole needle holder 139, positioning it longitudinally. The length of the needle hole needle holder 139 is shorter than the length of the needle 109 inserted into the needle hole 137, being 0.3 mm to 1 mm. The diameter Φ4 of needle holder 139 of the needle hole is larger than the inner diameter Φ1 of the needle and smaller than the outer diameter Φ2 of the needle. Furthermore, the diameter Φ4 of needle holder 139 of the needle hole is larger than the diameter Φ5 of medicinal solution passing hole 123. The relationship between the inner diameter Φ1 of needle 109, the outer diameter Φ2 of needle 109, the diameter Φ3 of needle hole 137, the diameter Φ4 of needle holder 139 of the needle hole, and the diameter Φ5 of the medicinal solution passing hole is expressed as follows: Φ1≦Φ5<Φ4<Φ2≦Φ3 By doing so, when needle hub 103 is fixed to syringe 105 and needle 109 is communicated with medicinal solution passing hole 123 to pass the medicinal solution, the medicinal solution will flow smoothly even if there is a slight misalignment between the central axes of needle 109 and medicinal solution passing hole 123. If the misalignment between the central axes of needle 109 and medicinal solution passing hole 123 does not cause any problems in injecting the medicinal solution, there may be no needle presser 139 in the needle hole, and needle 109 and medicinal solution passing hole 123 may be directly communicated with each other.

[0017] As shown in Figure 3, when fitting portion 113 fits into recess 111, front surface 121 of the fitting portion comes into contact with bottom surface 119 of the recess. This eliminates dead space for the medicinal solution, and loss of the medicinal solution is eliminated. Furthermore, the central axis of needle 109 approximately coincides with the central axis of medicinal solution passing hole 123. Therefore, needle 109 is in fluid communication with medicinal solution passing hole 123, and the medicinal solution flows from medicinal solution storage space 117 through medicinal solution passing hole 123 to needle 109.

[0018] As shown in Fig. 2, a recessed shape 127 may be formed around the entire circumference of the base of fitting portion 113. Also, a protruding shape 125 may be formed around the entire circumference of the opening of recess 111. As shown in Fig. 3, this protruding shape 125 engages with the recessed shape 127 to maintain the fitted state between fitting portion 113 and recess 111. Here, recessed shape 127 is formed around the entire circumference of fitting portion 113, and protruding shape 125 is formed around the entire circumference of recess 111. However, a recessed shape may be formed in fitting portion 113, and a protruding shape may be formed in recess 111, and the recessed shape and protruding shape may engage with each other to maintain the fitted state between fitting portion 113 and recess 111. Furthermore, although concave and convex shapes are provided at the base of fitting portion 113 and the opening of recess 111, concave and convex shapes may also be provided at the tip of fitting portion 113 and the back of recess 111, or at an intermediate portion between the tip and base of fitting portion 113, or an intermediate portion between the back and opening of recess 111. In any case, the positions of the concave and convex shapes that engage with each other are determined so that when fitting portion 113 is fitted into recess 111, front surface 121 of fitting portion 113 comes into contact with the bottom surface of recess 111.

[0019] As shown in FIG. 2, a recess 131 may be formed at approximately the center of the front surface 121 of the fitting portion 113 in a plan view. Furthermore, a protrusion 129 may be formed on the bottom surface 119 of the recess 111. As shown in FIG. 3, the protrusion 129 engages with the recess 131 during fitting, thereby positioning the central axis of the needle 109 and the central axis of the drug solution passing hole 123. In this manner, the needle 109 and the drug solution passing hole 123 are fluidly connected, allowing the drug solution to flow from the drug solution storage space 117 through the drug solution passing hole 123 to the needle 109. Here, the recess 131 is formed in the fitting portion 113, and the protrusion 129 is formed in the recess 111. Alternatively, a protrusion may be formed in the fitting portion 113, a recess may be formed in the recess 111, and the protrusion may engage with the recess to position the central axis of the needle 109 and the central axis of the drug solution passing hole 123.

[0020] As shown in FIG. 2, fitting portion 113 preferably has a truncated cone shape with side surface 135 having a slope of 5% to 7%, and more preferably, fitting portion side surface 135 has a slope of 6%. Furthermore, the inner surface of corresponding recess 111 also preferably has side surface 133 that narrows from the opening to bottom surface 119 at a slope of 5% to 7%, and more preferably, recess side surface 133 has a slope of 6%. Furthermore, as shown in FIG. 2, the length of the fitting portion and the length L of the drug solution passing hole are 6.0 mm to 8.0 mm, and preferably greater than 7.0 mm and equal to or less than 8.0 mm. The radius of front surface 121 of fitting portion 113 is 4.40 mm to 4.44 mm. It is preferable that bottom surface 119 of recess 111 is sized to correspond to front surface 121 of fitting portion 113. While shortening length L of the drug solution passing hole is preferable to reduce dead space, a length that provides sufficient fitting strength by the fitting portion is required. By using such a shape and size, needle hub 103 can be easily assembled to syringe 105, and needle hub 103 can be fixed so that it does not come off syringe 105 during injection.

[0021] The inner diameter Φ1 of the needle 109 is preferably 0.09 mm to 0.32 mm. The outer diameter Φ2 of the needle 109 is preferably 0.214 mm to 0.64 mm. As described above, the inner diameter Φ5 of the drug solution passing hole 123 is the same as or slightly larger than the inner diameter Φ1 of the needle 109 and smaller than the outer diameter Φ2 of the needle. Therefore, the inner diameter Φ5 of the drug solution passing hole 123 is preferably 0.1 mm to 0.5 mm, 0.1 mm to 0.2 mm, or 0.3 mm to 0.5 mm. By making the inner diameter Φ5 of the drug solution passing hole 123 the same as or slightly larger than the inner diameter Φ1 of the needle 109, it is possible to reduce dead space and drug solution loss. Furthermore, the length of the needle 109 is set to be sufficiently longer than the length of the drug solution passing hole 123. The length of the needle 109 is, for example, 2.5 cm to 6 cm. Even if the inner diameter Φ5 of the drug solution passing hole 123 is made equal to the inner diameter Φ1 of the needle 109, the pushing pressure only increases by the amount that the length of the drug solution passing hole 123 increases from 6.0 mm to 6.2 mm compared to the length of the needle 109, which is 3 cm to 6 cm, so the plunger can be pushed in without much increase in pressure.

[0022] It is preferable that the needle hub 103 is made of polycarbonate or polypropylene, and the syringe 105 is made of polypropylene. By making the needle hub 103 from polycarbonate or polypropylene, when the needle hub 103 and the syringe 105 are fitted together, assembly is easy and a frictional force can be obtained that prevents the needle hub 103 from coming off the syringe 105 during injection. Furthermore, by making the syringe 105 from polypropylene, it is possible to make a needle hole and a drug solution passage hole 123 of a desired diameter.

[0023] The syringe assembly of the present invention reduces dead space where the drug solution remains and is easy to assemble.

[0024] (Second syringe assembly with puncture prevention device) Figure 4 shows (a) a schematic diagram of a syringe assembly equipped with a stab prevention device according to one embodiment of the present invention, and (b) a schematic cross-sectional view taken along CC in Figure 4(a). Figure 5 shows (a) a schematic diagram of a syringe assembly with a stab prevention device engaged with a needle hub according to one embodiment of the present invention, and (b) a schematic cross-sectional view taken along DD in Figure 5(a). Figure 6 shows (a) a schematic diagram of the needle hub being removed from the syringe by the stab prevention device according to one embodiment of the present invention, and (b) a schematic cross-sectional view taken along EE in Figure 6(a). A second syringe assembly 201 equipped with a stab prevention device according to one embodiment of the present invention will be described with reference to Figures 4 to 6.

[0025] As shown in Figure 4(a), second syringe assembly 201 equipped with a puncture prevention device includes needle hub 203, syringe 205, and plunger 207 similar to those of first syringe assembly 101 described above, and further includes puncture prevention device 209. Puncture prevention device 209 of the present invention is a member used when removing needle hub 203, which has been fitted with syringe 205, from syringe 205. However, second syringe assembly 201 may be a syringe other than the syringe with reduced dead space described above.

[0026] As shown in FIG. 4(b), prick prevention device 209 includes hollow cylindrical body 213 whose inner diameter, excluding narrow inner portion 211, is larger than outer diameter 217 of the needle hub and whose inner diameter, including narrow inner portion 211, is larger than outer diameter 215 of the syringe body. That is, as shown in FIG. 4(b), if syringe 205 is cylindrical, prick prevention device 209 is preferably a hollow cylindrical body having an inner diameter, including narrow inner portion, larger than the outer diameter of the cylinder. If syringe 205 is a triangular prism, a square prism, an elliptical cylinder, or the like, hollow cylindrical body 213 can have an inner shape corresponding to the triangular prism, a square prism, an elliptical cylinder, or the like. Even if syringe 205 has an outer shape that tapers from the rear end to the front end, hollow cylindrical body 213 has an inner shape larger than outer diameter 215 of the syringe body and covers syringe 205.

[0027] The outer shape 217 of the needle hub is larger than the narrow inner portion 211. One form thereof, as shown in FIG. 4(b), is a flange that protrudes in the cross-sectional circumferential direction of the syringe 205, with a portion that is larger than the outer shape of the syringe 205 in the circumferential direction. The flange may have a polygonal, elliptical, or circular cross-sectional shape. The cross-sectional shape of the flange is preferably a cross-sectional shape that matches the cross-sectional shape of the narrow inner portion 211. In one embodiment, the cross-sectional shape of the flange is circular, and the cross-sectional shape of the narrow inner portion 211 is also circular. The outer shape 217 of the needle hub can take various forms, but is not limited to this.

[0028] In the puncture prevention device 209 of the present invention, a hollow cylindrical body 213 is attached to the outside of a syringe 205 when the needle hub 203 is not attached. The needle hub 203 is fitted to the front end 219 of the syringe to which the hollow cylindrical body 213 is attached, thereby assembling a second syringe assembly 201. After an injection, when the needle hub 203 fitted to the syringe 205 is removed from the syringe to be discarded, the puncture prevention device 209 is slid to the front end of the syringe, as shown in FIG. 5( a). As shown in FIG. 5( b), the hollow cylindrical body 213 moves forward, and the entire needle hub 203, including the needle 221, is covered by the hollow cylindrical body 213, and the narrow inner portion 211 and the outer portion 217 of the needle hub engage with each other. As shown in FIGS. 6( a ) and 6 ( b ), the hollow cylindrical body 213 is further moved forward, and the needle hub 203 is removed from the syringe 205 while being covered with the hollow cylindrical body 213 .

[0029] Narrowed inner portion 211 has a slope that gradually narrows from the front to the rear. As shown in Figure 4(b), narrowed inner portion 211 can be provided at either the front or rear of puncture prevention device 209, but is preferably located at the rear end of puncture prevention device 209. In this way, the entire needle 221, including needle hub 203, can easily fit inside puncture prevention device 209.

[0030] As shown in FIG. 6(b), the length of hollow cylindrical body 213 is longer than the length of needle hub 203 including needle 221, so that the entire needle 221 can be accommodated in hollow cylindrical body 213. Because the entire needle 221 is covered by puncture prevention device 209, there is no need to worry about medical personnel being accidentally pricked by the needle when removing needle hub 203. Furthermore, as shown in FIG. 6(b), needle hub 203 engages with and is fixed in puncture prevention device 209. Therefore, even if needle 221 and needle hub 203 are disposed of together with puncture prevention device 209, there is no need to worry about medical personnel being accidentally pricked by the needle, and there is no need to worry about medical personnel coming into contact with a patient's bodily fluids or blood remaining in the needle and needle hub.

[0031] 4(b), the rear end of hollow cylindrical body 213 preferably has an engaging portion 223 that engages with a flange 227 formed on the rear end of syringe 205. When engaging portion 223 of hollow cylindrical body 213 engages with flange 227 of syringe 205, movement of hollow cylindrical body 213 relative to syringe 205 is restricted. In this way, hollow cylindrical body 213 does not move from syringe 205 during injection, making the injection operation easier.

[0032] As shown in Figure 6(b), a recessed shape 231 is formed around the entire circumference at the base of front end 219 of syringe. It is also preferable that a protruding shape 229 is formed around the entire circumference at the opening of recess 225. This strengthens the fit between needle hub 203 and syringe 205, preventing them from coming apart during injection. After injection, however, needle hub 203 can be easily removed from syringe 205 using prick prevention device 209 of the present invention.

[0033] The present invention provides an accidental puncture prevention device that separates the needle hub from the syringe to protect the needle and allow it to be disposed of.

[0034] The above-described embodiments are illustrative in all respects and are not restrictive. Variations and modifications are possible for those skilled in the art. The scope of the present invention is defined not by the above-described embodiments but by the claims. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope of the claims and their equivalents. [Industrial Applicability]

[0035] The syringe assembly provided by the present invention allows injection with minimal loss of medication, and the needle hub can be safely disposed of using the needle puncture prevention device provided by the present invention. [Explanation of symbols]

[0036] 101 first syringe assembly 103 Needle Hub 105 Syringe 107 Plunger 109 needles 111 recess 113 Fitting part 115 Back of syringe 117 Chemical storage space 119 Bottom of recess 121 Front of mating part 123 Chemical solution passage hole 125 Convex shape 127 Concave shape 129 Protrusion 131 Hollow 133 Side of recess 135 Side of mating part 137 Needle hole 201 second syringe assembly 203 Needle Hub 205 Syringe 207 Plunger 209 Accidental puncture prevention device 211 Internal narrow part 213 Hollow cylinder 215 Syringe body outer shape 217 Needle hub outer shape 219 Front end of syringe 221 needles 223 Engagement part 225 recess 227 Flange 229 Convex shape 231 Concave shape

Claims

1. A syringe having a substantially cylindrical or substantially frustum-shaped fitting portion at a front end thereof; a needle hub having a recess at its rear end that fits into the fitting portion; a puncture prevention device that is a member used when removing the needle hub that has been fitted to the syringe from the syringe, the puncture prevention device comprising a hollow cylindrical body whose inner shape, excluding a narrow inner portion, is larger than the outer shape of the needle hub and whose inner shape, including the narrow inner portion, is larger than the outer shape of the syringe body; Equipped with The hollow cylindrical body of the puncture prevention device is attached to the outside of the syringe when the needle hub is not attached, The needle hub is fitted to the front end of the syringe to which the hollow cylindrical body is attached, a concave shape is formed around the entire circumference at the base of the front end of the syringe, and a convex shape is formed around the entire circumference at the opening of the recess of the needle hub, and when the needle hub is fitted onto the front end of the syringe, the concave shape and the convex shape are fitted together, When the needle hub fitted to the syringe is removed from the syringe, When the hollow cylindrical body moves forward, the inner narrow portion engages with the outer surface of the needle hub in a state where the entire needle hub including the needle is covered by the hollow cylindrical body, Further, when the hollow cylindrical body is moved forward, the engagement between the concave shape and the convex shape is released, and the needle hub is removed from the syringe while being covered by the hollow cylindrical body.

2. The syringe assembly according to claim 1, wherein the narrowed inner portion has a slope that gradually narrows from the front side to the rear side.

3. 3. The syringe assembly according to claim 1, wherein the length of the hollow cylindrical body is longer than the length of the needle hub including the needle.

4. an engaging portion at a rear end of the hollow cylindrical body that engages with a flange formed at a rear end of the syringe; The syringe assembly according to claim 1 , wherein the engagement portion of the hollow cylindrical body engages with the flange of the syringe, thereby restricting movement of the hollow cylindrical body relative to the syringe.

5. The syringe assembly according to claim 1 , wherein the hollow barrel has a hollow cylindrical shape.

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