JP2009095392A - Injection needle and syringe using the same - Google Patents

Abstract

The present invention provides an injection needle that can prevent a needle stick accident caused by an injection needle and protect the needle to prevent breakage while having a simple configuration.
An injection needle 10 includes an inner cylinder 12 attached to a syringe body and an outer cylinder 30 slidable along a side surface thereof. A base portion 16 and a fixing portion 18 for fixing the needle 20 are provided inside the cylindrical portion 14 of the inner cylinder 12, and a protrusion 24 is provided in the vicinity of the end portion 12 </ b> B on the outer side surface of the cylindrical portion 14. The outer cylinder 30 includes a holding guide 32 having a through-hole 34 having a predetermined length at a substantially central portion of the closed end surface 30B, and a substantially L-shaped groove 36 that engages with the protrusion 24 on the side surface 30C. . When the outer cylinder 30 is slid so that the protrusion 24 moves in the groove 36, the needle 20 can be taken in and out of the outer cylinder 30. Further, when the needle 20 is pulled into the outer cylinder 30 to the maximum, its tip is held by the through hole 34, so that it is possible to prevent breakage and breakage.
[Selection] Figure 1

Description

  The present invention relates to a syringe needle and a syringe using the same, and more specifically to protection of a syringe needle that can be attached to and detached from a syringe body.

  In order to ensure safety, a syringe used in the medical field such as insulin injection is recommended to cover the injection needle with a cap or cover before and after use or at the time of disposal. Conventionally, the injection needle and the cap are prepared separately, the cap is removed at the time of use, and the cap is again fitted and disposed after use. However, since the cap is fitted into a thin needle, there is a risk that the needle may be accidentally pierced with a finger or hand, and the needle may be broken or bent if the cap is not fitted straight. This tendency is particularly strong for people with physical disabilities and the elderly. In addition, a needlestick accident caused by an injection needle after use has caused bacteria and viruses to infect medical workers and medical waste processors from the blood of patients.

On the other hand, the following patent document 1 discloses a syringe and an injection needle having a false sting prevention mechanism that does not require removal of the cap before and after use. According to this technique, a through hole is provided in the approximate center of the closed end of the protective cover for covering the needle of the syringe, and before and after using the syringe, the tip of the syringe is inserted into the protective cover from the open end of the protective cover. Cover the needle with a protective cover by insertion. When the syringe is used, a protective cover is further pushed into the syringe to expose the needle from the through hole.
JP 2006-149513 A

  However, in the background art described in Patent Document 1, as shown in FIGS. 2 and 3, the needle is completely accommodated in the protective cover before and after the use of the syringe. That is, there is a gap between the tip of the needle and the inside of the end face of the protective cover. For this reason, when the needle is passed through the through hole of the protective cover, if the needle or the protective cover is slanted for some reason, the needle will contact the protective cover end face without passing through the through hole, Cannot be smoothly exposed from the protective cover. In particular, in the case of a small-diameter injection needle such as a needle used for insulin injection, there is a disadvantage that the needle itself is broken or bent and broken.

  The present invention pays attention to the above points, and an object of the present invention is to provide an injection needle capable of preventing a needle stick accident caused by an injection needle and protecting the needle to prevent breakage while having a simple configuration. It is to provide a syringe using the.

  In order to achieve the above object, the injection needle of the present invention has a substantially cylindrical shape with one end opened, the needle is fixed in the axial direction substantially at the center of the closed end face, and the opening end side is the syringe body. An inner cylinder that is detachably attached to the inner cylinder, and is provided with a holding part having a through-hole of a predetermined length through which the needle can penetrate, in a substantially cylindrical shape with one end opened, and at the substantially center of the closed end face And an outer cylinder slidable along the outer surface of the inner cylinder, a protrusion provided on the outer surface of the inner cylinder, and a side surface of the outer cylinder, the protrusion sliding inside. A groove having a shape that allows the needle to be taken in and out of the outer cylinder, and when the needle is drawn into the outer cylinder to the maximum, the tip of the needle is a through-hole in the holding portion of the outer cylinder. It is characterized by being held by.

  One of the main forms is characterized in that the protrusion provided on the outer surface of the inner cylinder is provided at a position near the closed end surface of the inner cylinder. Still another embodiment is that the groove is provided with position fixing means for fixing the protrusions at a position where the needle comes out of the outer cylinder and a position where the needle is hidden in the outer cylinder. Features. The syringe of the present invention is characterized in that any one of the injection needles is attached. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  According to the present invention, an injection needle is constituted by an inner cylinder in which a needle is fixed substantially at the center of the closed end surface and an outer cylinder slidable along the side surface, and the groove is provided along the groove provided on the side surface of the outer cylinder. By sliding a projection provided on the side surface of the inner cylinder, the needle is taken in and out from a through hole of a holding part provided on the closed end surface of the outer cylinder. In addition, since the tip of the needle is held by the through-hole when the needle is pulled into the outer cylinder to the maximum, the insertion and removal of the injection needle is guided to prevent damage and the like, and needle insertion with the injection needle The effect of preventing accidents is obtained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 (A-1) is a perspective view of the present embodiment showing a state in which the needle is taken out, (A-2) is a perspective view showing a state in which the needle is stored, and (B-1) is the above (A-1). ) Cut along line # A- # A and viewed in the direction of the arrow, (B-2) cut (A-2) along line # B- # B and viewed in the direction of the arrow It is sectional drawing. 2A and 2B are views showing an outer cylinder of the present embodiment, in which FIG. 2A is an external perspective view, and FIG. 2B is a cross-sectional view taken along line # C- # C as viewed in the direction of the arrow. FIG. The injection needle of the present invention can be attached to and detached from the syringe body like a disposable type or a pen type. As shown in FIG. 1, the injection needle 10 of this embodiment includes an inner cylinder 12 to which a needle 20 is fixed, and an outer cylinder 30 provided outside the inner cylinder 12. The needle 20 is formed of, for example, nickel, gold, SUS, or the like. For example, in the case of insulin injection, a needle having an inner diameter of about 0.12 to 0.13 mm is used.

  The inner cylinder 12 has a structure in which a base portion 16 having a substantially U-shaped cross section is continuously formed inside a substantially cylindrical tube portion 14 opened on one end portion 12A side. A fixing portion 18 for fixing the needle 20 in the axial direction is provided at a substantially central portion of the base portion 16. The needle 20 is inserted through a through hole formed in the fixing portion 18 in the axial direction. For example, the needle 20 is fixed from the inner side of the inner cylinder 12 with an adhesive or the like. Further, a flange portion 22 for receiving the end portion of the outer cylinder 30 is formed on the end portion 12A so as to protrude in the radial direction. Further, a projection 24 is provided on the outer surface of the cylindrical portion 14 at a position near the end 12B. In this embodiment, as shown in FIGS. 1 (B-1) and (B-2), two protrusions 24 are provided at opposing positions.

  Next, the outer cylinder 30 has a substantially cylindrical shape in which one end 30A is opened and the other end is opened, and the needle 20 can pass through a substantially central portion of the closed end surface 30B. A holding guide 32 having a through hole 34 is formed so as to protrude in the axial direction from the end face 30B. The through hole 34 has a reverse taper shape in the illustrated example, and guides the insertion and removal of the needle 20 and holds a tip of the needle 20 drawn into the outer cylinder 30 in a predetermined axial direction. It has a length. A side surface 30C of the outer cylinder 30 is provided with a substantially L-shaped groove 36 in which a long portion 36A formed in the axial direction of the needle 20 and a short portion 36B substantially orthogonal to the long portion 36A are continuous. Yes. In this embodiment, the width of the long portion 36A and the short portion 36B is set to be small enough to accommodate the protrusion 24 and to be slidable by being pushed in. At the corners, fitting portions 38A, 38B, and 38C that are slightly wider than the long portion 36A and the short portion 36B are formed. By setting the dimensions in this way, the protrusion 24 can be stably fitted to the fitting portions 38A, 38B, and 38C.

  Here, the length of the longitudinal portion 36 </ b> A of the groove 36 is set corresponding to the length in which the needle 20 is taken in and out. That is, when the protrusion 24 is positioned at the upper end (fitting portion 38A) of the longitudinal portion 36A, the needle 20 is held by the holding guide of the outer cylinder 30 as shown in FIGS. 1 (A-1) and (B-1). A predetermined length protrudes from 32. On the other hand, when the protrusion 24 is positioned at the short portion 36B, the needle 20 is pulled into the outer cylinder 30 as shown in FIGS. 1 (A-2) and (B-2). At this time, by setting the positions of the protrusions 24 and the grooves 36 so that the tip of the needle 20 is positioned in the through hole 34 of the holding guide 32, the needle 20 can surely pass through the through hole 34. become. Then, since the smooth insertion and removal of the needle 20 becomes possible, it is possible to prevent the needle 20 from contacting the inner side of the end surface 30B of the outer cylinder 30 and being broken or damaged. Further, a substantially circular recess 40 for placing a finger during operation is formed at an appropriate position outside the outer cylinder side surface 30C, and the outer cylinder 30 is provided on the inner end 30A side of the side surface 30C. A recess 42 is formed to facilitate fitting the projection 24 into the groove 36 when the inner cylinder 12 is covered. The inner cylinder 12 and the outer cylinder 30 as described above are formed of, for example, plastic.

  Next, the operation of this embodiment will be described. First, the positions of the concave portion 42 on the inner side of the outer cylinder 30 and the projection 24 of the inner cylinder 12 are aligned, the inner cylinder 12 is pushed into the outer cylinder 30, and the outer cylinder 30 is mounted by fitting the projection 24 into the groove 36. At this time, since the tip of the protrusion 24 is provided with an inclination from the closed side of the inner cylinder 12 toward the opening side, the operation of pushing the inner cylinder 12 into the outer cylinder 30 can be easily performed. Then, with the protrusion 24 aligned with the fitting portion 38A of the groove 36, the needle 20 is inserted into the through hole 34 of the outer cylinder 30 and the fixing portion of the inner cylinder 12, and an adhesive is formed inside the inner cylinder 12. The needle 20 is fixed to the inner cylinder 12 by, for example. Thereafter, the outer cylinder 30 is first slid in the axial direction to move the protrusion 24 to the lower end (fitting part 38B) of the long part 36A, and then the outer cylinder 30 is rotated to move the protrusion 24 along the short part 36B. To be fixed to the fitting portion 38C. In this state, as shown in FIGS. 1 (A-2) and (B-2), the needle 20 is drawn into the outer cylinder 30 to the maximum, and the tip of the needle 20 is caused by the through hole 34 of the holding guide 32. Is retained.

  When the injection needle 20 is used, the end 12A side of the inner cylinder 12 is attached to a syringe body (not shown), and then the outer cylinder 30 is first rotated and the projection 24 is moved to the short part 36B, contrary to the above-described storage operation. And slide to the fitting portion 38B. Then, the outer cylinder 30 is slid in the axial direction, and the protrusion 24 is fitted into the fitting portion 38A at the end of the longitudinal portion 36A. Then, as shown in FIGS. 1 (A-1) and (B-1), the tip of the needle 20 is exposed for a predetermined length from the holding guide 32 of the outer cylinder 30 and becomes ready for use. After the injection needle 10 is used, the storage operation described above is performed, and the needle 20 is stored in the outer cylinder 30 and then removed from the syringe body and discarded.

Thus, according to the first embodiment, there are the following effects.
(1) By forming a groove 36 on the side surface of the outer cylinder 30 slidable along the side surface of the inner cylinder 12 and sliding the projections 24 provided on the side surface of the inner cylinder 12 along the groove 36, The needle 20 is put in and out of a through hole 34 of a holding guide 32 provided in the outer cylinder 30, and the tip of the needle 20 is held by the through hole 34 when the needle 20 is drawn into the outer cylinder 30 to the maximum. It was decided to. For this reason, while protecting the needle | hook 20 and preventing a break and breakage, the needle stick accident by an injection needle, etc. can be prevented.
(2) The width of the long portion 36A and the short portion 36B of the groove 36 is set to be small enough to allow the protrusion 24 to slide by being pushed in, and the long portion 36A is provided at the end and corner of the groove 36. Since the fitting portions 38A to 38C having a slightly larger width than the short portion 36B are provided, the position of the protrusion 24 can be fixed in the fitting portions 38A to 38C.

  Next, Embodiment 2 of the present invention will be described with reference to FIG. In addition, the same code | symbol shall be used for the component which is the same as that of Example 1 mentioned above, or respond | corresponds (it is the same also about a following example). 3A and 3B are cross-sectional views of the present embodiment, in which FIG. 3A is a view showing a state where the needle is taken out, and FIG. 3B is a view showing a state where the needle is stored. The injection needle 50 according to the present embodiment basically has the same configuration as that of the first embodiment described above, and includes an inner cylinder 52 and an outer cylinder 70. The inner cylinder 52 has a base portion 56 formed continuously inside a substantially cylindrical tube portion 54, and a fixing portion 58 that protrudes in the axial direction from the base portion 56 is formed at a substantially central portion of the base portion 56. Is formed. The fixing portion 58 is provided with a through hole 60, and the needle 20 is fixed by appropriate means. A flange 62 is provided on the open end 52 </ b> A side of the inner cylinder 52, and a protrusion 64 is formed at an appropriate position of the cylinder 54.

  Next, the outer cylinder 70 has a substantially cylindrical shape opened on one end portion 70B side, and a holding guide 72 protruding inward is provided at a substantially central portion of the closed end surface 70A. A substantially funnel-shaped through hole 74 is formed in the holding guide 72, and a guide for taking in and out of the needle 20 and holding of the tip at the time of drawing are performed by the through hole 74. Further, a substantially L-shaped groove 76 is formed on the side surface 70C of the outer cylinder 70 by a long portion 76A, a short portion 76B, and fitting portions 78A to 78C. Even if the holding guide 72 of the outer cylinder 70 is formed to protrude inward as in the present embodiment, the same operations and effects as those of the first embodiment described above can be obtained.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shapes and dimensions shown in the above embodiments are merely examples, and may be changed as appropriate. For example, in the first embodiment, the groove 36 is substantially L-shaped as shown in FIG. 4A. However, this is also an example, and as shown in FIG. It is good also as the groove | channel 80 of the shape where 80B and the curved longitudinal part 80A continued. Further, as in the groove 82 shown in FIG. 4C, short portions 82B and 82C extending in opposite directions may be provided at both ends of the substantially horizontal long portion 82A. Further, as shown in the groove 84 shown in FIG. 4D, the vertical portion 84A may have a substantially T-shape connected to the center of the horizontal portion 84B, or as shown in the groove 86 shown in FIG. You may make it provide the short part 86B and 86C extended in the reverse direction at the upper end and lower end of the vertical longitudinal part 86A, respectively. Alternatively, as shown in the groove 88 shown in FIG. 4 (F), the position of the needle 20 can be fixed even if grooves are formed in a substantially vertical direction and fitting portions 88A and 88B are provided at both ends thereof. .

(2) The material shown in the above embodiment is also an example, and may be formed using various known materials.
(3) In the first embodiment, two protrusions 24 and two grooves 36 are provided. However, this is also an example, and the number of protrusions and grooves may be increased or decreased as necessary.
(4) The structure for fixing the needle 20 in the inner cylinder and the structure of the holding guide for the outer cylinder are examples, and the design may be changed as appropriate so as to achieve the same effect. Similarly, the assembly procedure of the inner cylinder, the outer cylinder, and the needle may be appropriately changed as necessary.
(5) In the present invention, injection needles for insulin injection, pen needles, dental anesthesia, and the like are preferable examples of use, but the present invention can be applied to various other known removable needles in general.

  According to the present invention, a groove is formed on the side surface of the outer cylinder that is slidable along the side surface of the inner cylinder, and a protrusion provided on the side surface of the inner cylinder is slid along the groove to thereby move the needle. Since the tip of the needle is held by the through-hole when the needle is pulled in and out from the through-hole of the holding guide provided in the outer cylinder and further pulled into the outer cylinder, it can be used for an injection needle. Applicable. In particular, it is suitable for the use of injection needles and syringes using small-diameter needles.

It is a figure which shows Example 1 of this invention, (A-1) is a perspective view which shows the state which took out the needle, (A-2) is a perspective view which shows the state which accommodated the needle, (B-1) Sectional view (A-1) cut along line # A- # A and viewed in the direction of the arrow, (B-2) sectioned above (A-2) along line # B- # B It is sectional drawing seen in the arrow direction. It is a figure which shows the outer cylinder of the said Example 1, (A) is an external appearance perspective view, (B) is sectional drawing which cut | disconnected said (A) along the # C- # C line | wire and looked at the arrow direction. . It is sectional drawing which shows Example 2 of this invention, (A) is a figure which shows the state which took out the needle | hook, (B) is a figure which shows the state which accommodated the needle | hook. It is a figure which shows the other Example of this invention.

Explanation of symbols

10: Injection needle 12: Inner cylinder 12A, 12B: End part 14: Tube part 16: Base part 18: Fixing part 20: Needle 22: Gutter part 24: Protrusion 30: Outer cylinder 30A: End part 30B: End face 30C: Side face 32 : Holding guide 34: Through hole 36: Groove 36A: Longitudinal portion 36B: Short portion 38A, 38B, 38C: Fitting portion 40, 42: Recess 50: Injection needle 52: Inner tube 52A: End portion 54: Tube portion 56 : Base 58: Fixing part 60: Through hole 62: Gutter part 64: Protrusion 70: Outer cylinder 70A: End face 70B: End part 70C: Side face 72: Holding guide 74: Through hole 76: Groove 76A: Longitudinal part 76B: Short Portions 78A, 78B, 78C: fitting portions 80, 82, 84, 86, 88: grooves 80A, 82A, 86A: longitudinal portions 80B, 82B, 82C, 86B, 86C: short portions 84A: vertical portions 84B: horizontal portions 88A, 88B: Fitting part

Claims (3)

An inner cylinder having one end opened in a substantially cylindrical shape, the needle being fixed in the axial direction substantially at the center of the closed end face, and the opening end being detachably attached to the syringe body;
A holding portion having a substantially cylindrical shape with one end opened and having a through-hole of a predetermined length through which the needle can pass is provided in the approximate center of the closed end surface, and the outer surface of the inner cylinder An outer cylinder slidable along
A protrusion provided on the outer surface of the inner cylinder,
A groove formed on a side surface of the outer cylinder, and having a shape in which the needle is inserted into and removed from the outer cylinder by sliding the protrusion on the inside;
With
An injection needle characterized in that, when the needle is drawn into the outer cylinder to the maximum, the tip of the needle is held by the through hole of the holding portion of the outer cylinder.   2. The groove according to claim 1, wherein position fixing means for fixing the protrusions is provided in the groove at a position where the needle comes out of the outer cylinder and a position where the needle is hidden in the outer cylinder. Needle.   A syringe equipped with the injection needle according to claim 1 or 2.

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