Needle with filter

Abstract

To provide a needle with a filter in which a liquid can be prevented from flowing into the needle body without passing the filter.SOLUTION: A needle 1 with a filter of the present disclosure is equipped with: a needle body 10 having a channel 16 extending from a tip 12 to a rear end 14; a needle body fixed part 22 in which the needle body 10 is fixed; a guide part 40 which forms a guide path 48 for guiding a liquid to the needle body fixed part 22; a hub 20 having a syringe installation part 30 which forms a fitting hole 34 for the tip of the syringe to be entered; and a filter 80 which separates the inside of the hub 20 between the guide path 48 and the fitting hole 34. The hub 20 is provided with a rib 50 which surrounds the guide path 48 and protrudes toward the fitting hole 34, while the filter 80 is welded in the rib 50.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a needle with a filter.

Background Art

[0002] Japanese Utility Model Application No. Sho 49-066494 (Japanese Utility Model Publication No. Sho 51-9594) (Patent Document 1) discloses a needle having a needle body and a hub to which the needle body is fixed, and a filter is provided inside the hub. In the needle disclosed in Patent Document 1, the filter is held by four protrusions extending in the cross direction. The chemical solution that has passed through the filter passes through the gaps between the four protrusions extending in the cross direction. The chemical solution that has passed through the gaps flows toward the needle body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, since the filter is held by the protrusions extending in the cross direction, there is a possibility that the chemical solution may flow without passing through the filter from the gap between the outer peripheral portion of the filter and the hub. The chemical solution may contain impurities, and there is a possibility that the impurities may flow into the needle body together with the chemical solution that has not passed through the filter.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a needle with a filter that can prevent a fluid from flowing into the needle body without passing through the filter.

Means for Solving the Problems

[0006] The filtered needle according to the present disclosure includes a needle body having a flow path extending from the tip to the rear end, a needle body fixing portion to which the needle body is fixed, a guiding portion forming a guiding path for guiding fluid to the needle body fixing portion, a hub having a syringe mounting portion forming a mounting hole into which the tip of the syringe is inserted, and a filter partitioning the inside of the hub into the guiding path and the mounting hole. The hub has a rib surrounding the guiding path and protruding toward the mounting hole, and the filter is welded to the rib.

Advantages of the Invention

[0007] According to the filtered needle of the present disclosure, since the hub has a rib surrounding the guiding path and protruding toward the mounting hole, and the filter is welded to the rib, all the fluid flowing into the needle body passes through the filter. Thereby, it is possible to prevent impurities to be filtered by the filter from flowing into the needle body.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Hereinafter, the filtered needle in the embodiment based on the present disclosure will be described with reference to FIGS. 1 to 5.

[0010] Figure 1 is a perspective view of the needle with a filter according to the embodiment. Figure 2 is a perspective view showing a state in which a part of the hub of the needle with a filter is omitted. Figure 3 is a cross-sectional view of the needle with a filter.

[0011] The needle 1 with a filter according to the present embodiment has a needle body 10, a hub 20, and a filter 80 (Figs. 2 and 3).

[0012] The needle body 10 has a tip 12 and a rear end 14. The needle body 10 has a flow path 16 extending from the rear end 14 to the tip 12 inside thereof. The tip 12 is formed in a spire shape. The rear end portion including the rear end 14 of the needle body 10 is fixed to the hub 20.

[0013] The hub 20 is formed of a resin molded product. As shown in Fig. 3, the hub 20 has a needle body fixing portion 22 to which the needle body 10 is fixed, a guiding portion 40 that forms a guiding path 48 for guiding fluid to the needle body fixing portion 22, and a syringe mounting portion 30 that forms a mounting hole 34 into which the tip portion of the syringe is inserted.

[0014] A reinforcing member 26 for reinforcing the needle body fixing portion 22 is provided on the outer surface of the needle body fixing portion 22. The reinforcing member 26 is a plate-like reinforcing rib protruding from the outer peripheral surface of the needle body fixing portion 22. The reinforcing member 26 protrudes from the outer peripheral surface of the needle body fixing portion 22 in a cross direction. In the present embodiment, four needle body fixing portions 22 are provided.

[0015] As shown in Fig. 3, a through hole into which the rear end portion including the rear end 14 of the needle body 10 is inserted is provided at the center of the needle body fixing portion 22. The rear end portion including the rear end 14 of the needle body 10 is fixed inside the through hole. Thereby, the needle body 10 is held by the hub 20 in a state where its tip portion protrudes.

[0016] The guiding path 48 guides fluid to the needle body 10 held by the needle body fixing portion 22. The guiding path 48 is provided inside the guiding portion 40. The cross-sectional area of the guiding path 48 gradually decreases as it approaches the needle body 10. In the present embodiment, the cross-sectional shape of the guiding path 48 is circular. A reinforcing member 26 is also provided on the outer peripheral surface of the guiding portion 40. The reinforcing member 26 extends continuously from the outer peripheral surface of the needle body fixing portion 22 to the outer peripheral surface of the guiding portion 40.

[0017] Inside the hub 20, a filter 80 is provided that divides the inside of the hub 20 into the guiding path 48 and the mounting hole 34. In the present embodiment, the outer shape of the filter 80 is circular. As the filter 80, a filter of an appropriate material is selected according to the liquid accommodated in the syringe to be mounted. The filter 80 is welded to a rib 50 provided on the hub 20. The rib 50 is circular as viewed from the side of the mounting hole 34 as shown in FIG. 2. The filter 80 and the rib 50 are welded without gaps over the entire circumference so as to surround the guiding path 48.

[0018] The cross-sectional shape of the rib 50 will be described with reference to FIGS. 4 and 5. FIG. 4 is an enlarged cross-sectional view of the filter needle in the present embodiment. FIG. 5 is an enlarged cross-sectional view showing the structure of the hub used for the filter needle in the present embodiment before fixing the filter.

[0019] As shown in FIG. 4, the mounting surface 52 of the rib 50 to which the filter 80 is welded is a flat surface. The mounting surface 52 is circular as viewed from the mounting hole 34. The inner peripheral side of the mounting surface 52 of the rib 50 is an inclined surface 54 that is obliquely inclined. The inclined surface 54 extends in the circumferential direction so as to surround the guiding path 48. A conical surface is formed by the inclined surface 54.

[0020] The end of the inclined surface 54 is directly connected to the peripheral surface 42 of the guiding path 48. In other words, the end of the inclined surface 54 that connects to the peripheral surface 42 of the guiding path 48 and the end of the peripheral surface 42 of the guiding path 48 that connects to the inclined surface 54 are directly connected to each other.

[0021] As shown in FIG. 5, even in the rib 50 before the filter 80 is welded, the tip surface 52a corresponding to the mounting surface 52 is a flat surface. However, the area of the tip surface 52a before the filter 80 is welded is smaller than that of the mounting surface 52 where the filter 80 is welded. This is because when the filter 80 is welded, a part of the resin material constituting the rib 50 melts and is absorbed by the filter 80.

[0022] The needle 1 with a filter according to the present embodiment is used by being mounted on a syringe (not shown). Specifically, by inserting the tip of the syringe into the mounting hole 34, the needle 1 with a filter is fixed to the syringe by the syringe mounting portion 30.

[0023] Liquids such as chemical solutions discharged from the tip of the syringe pass through the filter 80 and are filtered. The filtered liquid flows into the guiding path 48. Since the filter 80 surrounds the guiding path 48 and is welded to the rib 50 that protrudes toward the mounting hole 34, all the fluids flowing into the guiding path 48 pass through the filter 80. Thereby, it is possible to prevent impurities to be filtered by the filter 80 from flowing into the guiding path 48 and the flow path 16 of the needle body 10.

[0024] In particular, in recent years, the administration of protein preparations with needles and syringes has been increasing. Protein preparations may contain protein aggregation foreign matters. According to the needle 1 with a filter of the present embodiment, such protein aggregation foreign matters can be surely removed by the filter 80.

[0025] The mounting surface 52 of the rib 50 on which the filter 80 is mounted is a flat surface. Thereby, the rib 50 is formed in a triangular cross-sectional shape, and the filter 80 can be surely fixed to the rib 50 as compared with the case where the mounting portion is formed by a circular line. Thereby, the welding area is enlarged, and the risk of peeling or falling off of the filter 80 can be reduced.

[0026] Before the filter 80 is welded, the rib 50 is provided with a flat surface on the tip surface 52a corresponding to the mounting surface 52. Thereby, the filter 80 can be welded to the rib 50 over a relatively large area.

[0027] Since the inner peripheral surface of the rib 50 is an inclined surface 54 that is obliquely inclined, the fluid filtered by the filter 80 can smoothly flow into the guiding path 48. Since the end of the inclined surface 54 is directly connected to the peripheral surface 42 of the guiding path 48, the fluid flowing along the inclined surface 54 directly flows into the guiding path 48 as compared with the case where a stepped portion or the like is provided between the inclined surface 54 and the peripheral surface 42. Thereby, the remaining liquid remaining in the stepped portion or the like can be reduced.

[0028] Since the cross-sectional area of the guiding path 48 gradually decreases as it approaches the needle body 10, the fluid can flow smoothly into the needle body 10.

[0029] <Summary of the disclosure in the embodiments etc.> Summarizing the characteristic points disclosed in the above-described embodiments, it is as follows.

[0030] [Appendix 1] A needle body having a flow path extending from the tip to the rear end, A hub having a needle body fixing portion to which the needle body is fixed, a guiding portion forming a guiding path for guiding fluid to the needle body fixing portion, and a syringe mounting portion forming a mounting hole into which the tip of the syringe is inserted, A filter that divides the inside of the hub into the guiding path and the mounting hole, A filter-equipped needle comprising: The hub has a rib that surrounds the guiding path and protrudes toward the mounting hole, The filter is welded to the rib, a filter-equipped needle.

[0031] [Appendix 2] The mounting surface of the rib on which the filter is mounted is a flat surface, the filter-equipped needle according to Appendix 1.

[0032] [Appendix 3] The rib is circular, the needle with filter according to Appendix 1 or Appendix 2.

[0033] [Appendix 4] The inner peripheral surface of the rib is an inclined surface inclined obliquely, and the end of the inclined surface is directly connected to the peripheral surface of the guiding path, the needle with filter according to any one of Appendix 1 to Appendix 3.

[0034] [Appendix 5] The cross-sectional area of the guiding path gradually becomes smaller as it approaches the needle body, the needle with filter according to any one of Appendix 1 to Appendix 4.

[0035] The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is shown not by the above description but by the claims, and all changes within the meaning and scope equivalent to the claims are intended to be included.

Explanation of Reference Numerals

[0036] 1 Needle, 10 Needle body, 12 Tip, 14 Rear end, 16 Flow path, 20 Hub, 22 Needle body fixing part, 26 Reinforcing member, 30 Syringe mounting part, 34 Mounting hole, 40 Guiding part, 42 Peripheral surface, 48 Guiding path, 50 Rib, 52 Mounting surface, 52a Tip surface, 54 Inclined surface, 80 Filter.

Claims

1. a needle body having a flow path extending from the tip to the rear end; a needle body fixing part to which the needle body is fixed, a guiding part forming a guiding path for guiding fluid to the needle body fixing part, and a syringe mounting part forming a mounting hole into which the tip of the syringe is inserted; a filter partitioning the interior of the hub into the guiding path and the mounting hole; a needle with a filter, comprising: the hub has a rib surrounding the guiding path and protruding toward the mounting hole; the filter is welded to the rib, the needle with a filter.

2. The needle with a filter according to claim 1, wherein the mounting surface of the rib on which the filter is mounted is a flat surface.

3. The needle with a filter according to claim 1 or claim 2, wherein the rib is circular.

4. The needle with a filter according to claim 1 or claim 2, wherein the inner peripheral surface of the rib is an inclined surface inclined obliquely, and the end of the inclined surface is directly connected to the peripheral surface of the guiding path.

5. The needle with a filter according to claim 1 or claim 2, wherein the cross-sectional area of the guiding path gradually decreases as it approaches the needle body.

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