JP5095500B2 - Positioning member for plunger in glass syringe - Google Patents

Description

  The present invention relates to a positioning member that positions a plunger so that a glass syringe is not damaged in a conveyance process or the like.

  Conventionally, the glass syringe 2 provided with the glass barrel 3 and the glass plunger 4 has a structure shown in FIG. ) And (b) are used. This conventional holder 5 is formed by bending a stainless steel thin plate, and sandwiches the outer periphery of the barrel portion 33 of the barrel 3 by its own elasticity in the vicinity of the flange portion 32 at the proximal end portion of the barrel 3. A clamping portion 51 extending from the clamping portion 51 to the proximal end side of the barrel 3 and extending from the portion 32a where the protrusion of the flange portion 32 is small toward the axial center of the barrel 3 toward the plunger 4 side. And a protruding depressing portion 52. In such a conventional holder 5, when the plunger 4 is inserted up to the tip portion inside the barrel 3, the restraining portion 52 is positioned at the small diameter portion 43 of the plunger 4. With this configuration, when the plunger 4 tries to move rearward in FIG. 5A when the syringe 2 is transported or the like, the restraining portion 52 slides on the small diameter portion 43 of the plunger 4 and the inner peripheral surface of the barrel 3. Since it contacts the inclined part 42 at the boundary with the part 41, the movement of the plunger 4 is suppressed.

  However, in such a conventional holder 5, since the restraining portion 52 can be deformed by its own elasticity, the inclined portion 42 of the plunger 4 is restrained when strong vibration or the like is applied to the syringe 2 during transportation. There is a possibility that the portion 52 is spread and the plunger 4 moves in the barrel 3 and collides with the barrel 3 to damage either or both of them, or the plunger 4 falls from the barrel 3 and is damaged.

  Further, when the user tries to use the syringe 2, the plunger 4 can be pulled out from the barrel 3 with the holder 5 attached, so that the user may use the syringe 2 as it is. Such a usage pattern is not preferable because it is different from the usage purpose of the holder 5.

  Further, since the strength of the conventional holder 5 decreases as the length of the restraining portion 52 increases in structure, the conventional holder 5 is mounted so that the restraining portion 52 is positioned at a location 32a where the protruding amount of the flange portion 32 of the barrel 3 is small. It has become. For this reason, when the restraining portion 52 is attached to the portion 32b where the protruding amount of the flange portion is large, the restraining portion 52 is expanded and does not come into contact with the inclined portion 42 and the large diameter portion 41 of the plunger 4. If it is installed by mistake, there is also a disadvantage that the function as the holder 5 is lost.

On the other hand, Patent Document 1 below discloses a heat-shrinkable film that houses a so-called prefilled syringe prefilled with a chemical solution. In this film, the portion from the rear end of the barrel to the plunger is thermally shrunk so that the plunger does not move relative to the barrel.
JP-A-8-52210

  Since the film disclosed in Patent Document 1 holds the plunger so that it does not move when the prefilled syringe is transported, the barrel and the plunger are fixed and packaged using the glass syringe. You can also.

  However, in such packaging, for example, when the syringe is taken out by tearing the film with the tip of the barrel (side on which the chemical solution is discharged) facing upward, the plunger may slide off from the barrel. Such an inconvenience does not occur in a prefilled syringe as in Patent Document 1 or a syringe in which a rubber piston is attached to the tip of a plunger, but in a glass syringe with no chemical in the barrel. Cause inconvenience.

  An object of the present invention is to improve a positioning member for positioning a plunger in a glass syringe so that the plunger can be surely positioned with respect to the barrel so that the plunger does not fall from the barrel when the positioning member is removed. It aims at providing the positioning member which can be removed.

  In order to achieve the above object, a plunger positioning member in the glass syringe of the present invention comprises a glass cylindrical barrel and a glass plunger slidable in the barrel. In a glass syringe having a barrel side flange portion protruding in the outer peripheral direction at the end portion and a plunger side flange portion protruding in the outer peripheral direction at the proximal end portion of the plunger, the plunger does not collide with the barrel. A positioning member for positioning the plunger, and a holding portion mounted on an outer periphery of the barrel portion of the barrel, and from the holding portion to the barrel-side flange portion and the plunger-side flange portion toward the axial base end side An extending portion extending from the extending portion to the opposite side of the plunger across the plunger side flange portion. A stop portion and a lateral side restraining portion extending from the proximal side restraining portion to the distal end side of the plunger, wherein the lateral side restraining portion is in a state where the plunger is located on the distal end side inside the barrel It is located at the base end side from the plunger side flange portion, and faces the side of the plunger side flange portion in a state where the plunger side flange portion is in contact with the base end side restraining portion. And

  According to the plunger positioning member of the present invention, the plunger is fixed to the barrel by the holding portion, and the movement of the plunger toward the base end side is suppressed by the base end side suppressing portion. Moreover, in the state which stood the said barrel side with the front end side of the said barrel down, the said plunger is located in the front end side inside the said barrel. In this state, when the positioning member of the present invention is to be removed from the barrel, the distal end portion of the lateral side restraining portion is located on the proximal end side with respect to the plunger side flange portion. The part does not come into contact with the plunger and can be easily removed.

  On the other hand, in the state where the barrel is set up with the tip end side of the barrel up, the plunger is on the lower side, so that the plunger slides inside the barrel and moves to the base end side to become the base end side restraining portion. Abut. This prevents the plunger from falling off the barrel. Further, in this state, when the user tries to remove the positioning member of the present invention from the barrel, the side-side restraining portion comes into contact with the side surface of the plunger-side flange portion, and thus cannot be easily removed. Therefore, it is possible to prevent a situation in which the user accidentally removes the positioning member of the present invention and drops the plunger while the plunger is down. In addition, since the proximal end side restraining portion is provided, the syringe cannot be used for injection in a state where the positioning member of the present invention is mounted on the syringe, thus preventing an erroneous usage method by the user. be able to.

  Moreover, in the positioning member of the plunger in the glass syringe of the present invention, the extension part protrudes toward the plunger side at a front position with respect to the base end side restraining part, and the barrel moves when the plunger moves forward. It is preferable that a front side restraining portion that abuts on the plunger side flange portion is provided so as to prevent abutment on the inner tip side. Thus, by providing the front side restraining portion in the extension portion, even when the plunger moves downward when the front end portion of the barrel is directed downward, the plunger side flange portion is located on the front side. Since the plunger abuts against the tip of the barrel because it abuts against the suppression portion, it is possible to prevent the syringe from being damaged.

  Moreover, in the positioning member of the plunger in the glass syringe of the present invention, the extending portion has a notch at a location facing the barrel-side flange portion, and the holding portion is mounted on the outer periphery of the barrel portion of the barrel In this case, it is preferable that the cutout portion is formed so as to be located outside the maximum projecting portion of the barrel side flange portion. By configuring the notch portion in such a manner, the barrel side flange portion does not contact the extension portion regardless of the radial direction of the barrel when the positioning member of the present invention is mounted. The member can be easily attached to the syringe.

  Moreover, in the positioning member of the plunger in the glass syringe of this invention, it is preferable to equip the axial direction center part of the said extension part with the handle which protrudes on the thickness direction outer side. Thus, by providing a handle in the center of the extension part, the positioning member can be attached and detached in parallel with the radial direction of the syringe. Therefore, when trying to remove the positioning member from the syringe with the barrel standing up with the barrel tip up, the side-side restraining portion can be surely brought into contact with the side surface of the plunger-side flange portion. it can.

  Next, an example of an embodiment of a plunger positioning member in the glass syringe of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory view showing a state in which the positioning member of the present embodiment is mounted on a glass syringe, FIG. 2 is an explanatory view showing details of the positioning member of the present embodiment, and FIG. FIG. 4 is an explanatory view showing the relationship between the plunger and the positioning member in a state where the tip of the barrel faces downward.

  The positioning member 1 of this embodiment is a member attached to the base end side (right side in FIG. 1) of the syringe 2 which has the glass barrel 3 and the plunger 4 as shown in FIG. Here, the syringe 2 includes a substantially cylindrical barrel 3 having a chemical solution discharge port 31 at the distal end, a flange portion 32 projecting outward at the proximal end, and a cylindrical body portion 33, and an inner peripheral surface of the barrel 3. A plunger 4 having a large-diameter portion 41 that is in sliding contact, a small-diameter portion 43 that continues from the large-diameter portion 41 through an inclined portion 42, and a flange portion 44 that is provided at the base end portion is provided.

  The positioning member 1 of the present embodiment includes a holding portion 11 attached to the outer periphery of the barrel portion 33 on the proximal end side of the barrel 3, a rod-like extending portion 12 extending from the holding portion 11 in the proximal direction of the barrel 3, A proximal end side restraining portion 13 that curves 90 ° from the extending portion 12 and extends in a substantially L shape, and a lateral side restraint portion 14 that further curves 90 ° from the proximal end side restraining portion 13 and extends in the distal end direction of the barrel 3. And.

  As shown in FIG. 2C, the holding part 11 is formed in a substantially C shape so that the body part 33 of the barrel 3 can be clamped by its own elasticity. Further, the tip end portion 11 a slightly protrudes toward the barrel 3, and the interval is narrower than the outer diameter of the barrel 3.

  The extension portion 12 is provided with a front side restraining portion 12a that protrudes toward the plunger 4 side. The front side restraining portion 12 a has a protruding amount that does not contact the small diameter portion 43 but contacts the front surface of the flange portion 44 when the plunger 4 is mounted on the barrel 3.

  The extending portion 12 is provided with a handle 12b that protrudes outward in the width direction. The handle 12b extends so that the positioning member 1 can be removed in the radial direction of the syringe 2, that is, in parallel with the base end surface of the flange portion 44 of the plunger 4 in a state where the positioning member 1 is mounted on the syringe 2. It is provided in the approximate center of the part 12. Also, a pair of recesses 12 c are provided on both sides of the extension portion 12 in the vicinity of the handle 12 b so that the user can easily grasp the extension portion 12 with a finger when removing the positioning member 1 from the syringe 2. .

  Further, the extending part 12 is provided with a notch part 12 d in the vicinity of the connecting part with the holding part 11. The notch 12d contacts the flange 32 even when it faces the portion 32b (see FIG. 5C) where the flange portion 32 of the barrel 3 has a large protruding amount or faces the portion 32a where the protruding amount is small. The size of the dent is not.

  The proximal end side restraining portion 13 extends so as to face the proximal end surface of the flange portion 44 of the plunger 4, and restrains the movement of the plunger 4 so that the plunger 4 does not fall out of the barrel 3. In the present embodiment, it is formed in a single bar shape having the same width as the extension portion 12.

  As shown in FIG. 2A, the side-side deterring portion 14 protrudes from the proximal-side deterring portion 13 toward the front of the syringe 2, that is, the side where the holding portion 11 is provided. Moreover, the side side suppression part 14 becomes a shape which protrudes in a rectangular shape in the width direction, as shown to FIG.2 (b) (c).

  Next, the operation of the positioning member 1 of the present embodiment will be described with reference to FIGS. First, as shown in FIG. 1, the syringe 2 is in a state where the plunger 4 is inserted into the barrel 3 and the positioning member 1 is mounted on the proximal end side of the barrel 3 at the time of conveyance or the like. . Specifically, the holding part 11 is sandwiched between the body part 33 near the flange part 32 of the barrel 3. Further, the flange portion 44 of the plunger 4 is located between the front side restraining portion 12 a and the proximal side restraining portion 13. The flange portion 32 of the barrel 3 is located in the cutout portion 12 d of the extension portion 12.

  In a state before use, the syringe 2 is stored in a packaging film (not shown) in the state shown in FIG. 1, and is packed and distributed in that state. In this state, when vibration or the like during conveyance is applied to the syringe 2, the plunger 4 may move in the left-right direction in FIG. 1 with respect to the barrel 3, but when the plunger 4 moves forward, the flange 4 Since the part 44 contacts the front side deterrence part 12a, it does not move further forward. Therefore, the tip of the plunger 4 does not collide with the tip of the barrel 3. Further, when the plunger 4 moves rearward, the plunger 4 abuts on the proximal end side restraining portion 13, so that the plunger 4 does not move further rearward. Thus, according to the positioning member 1 of the present embodiment, the plunger 4 does not collide with the barrel 3 and the plunger 4 falls from the barrel 3 even when vibration or the like is applied to the syringe 2. Therefore, the syringe 2 is prevented from being damaged.

  Next, as shown in FIG. 3, a case where the user tries to remove the positioning member 1 with the distal end side of the syringe 2 facing upward will be described. When the syringe 2 is in the state as shown in FIG. 3, the plunger 4 is lowered by its weight, so that the proximal end surface of the flange portion 44 comes into contact with the proximal end side restraining portion 13. In this state, even if the user holds the handle 12b and tries to remove the positioning member 1 in the direction of the arrow in the figure, the positioning member 1 is easy because the side restraining portion 14 abuts against the side surface of the flange portion 44. Cannot be removed from the barrel 3. Therefore, even if the user inadvertently tries to remove the positioning member 1 in the state shown in FIG. Thus, since the user cannot remove the positioning member 1 in a situation where the plunger 4 may drop downward, the user will not accidentally drop the plunger 4.

  Next, as shown in FIG. 4, a case where the user removes the positioning member with the distal end side of the syringe 2 positioned downward will be described. In the state shown in FIG. 4, the plunger 4 is lowered by its weight, and the flange portion 44 comes into contact with the front side restraining portion 12 a. In this state, when the user holds the handle 12b and removes the positioning member 1 in the direction of the arrow in the figure, the side-side restraining portion 14 is located above the proximal end surface of the flange portion 44. However, by moving the positioning member 1 in the direction of the arrow, the holding portion 11 can be released and the positioning member 1 can be removed from the barrel 3. As described above, in a state where the distal end side of the syringe 2 is at the lower side, the plunger 4 does not fall from the barrel 3, so that the positioning member 1 can be removed without damaging the plunger 4.

  As described above, the positioning member 1 of the present embodiment maintains the positional relationship between the barrel 3 and the plunger 4 at a predetermined position when the syringe 2 is transported, and the barrel 3 and the plunger 4 collide with each other. The situation where it breaks can be prevented. In addition, when the positioning member 1 is removed from the syringe 2, it is possible to prevent the plunger 4 from being accidentally dropped from the barrel 3.

  In particular, in the positioning member 1 of the present embodiment, since the handle 12b is provided at the center of the extending portion 12, the positioning member 1 can be moved in parallel with the proximal end surface of the plunger 4, and therefore, shown in FIG. When in the state, the function of the side-side deterring unit 14 can be reliably exhibited.

  The positioning member of the present invention is not limited to the embodiment shown in the above-described embodiment and each drawing, and can be appropriately changed within the spirit of the present invention. For example, in the above-described embodiment, the holding portion 11 is configured to be sandwiched between the barrel portion 33 of the barrel 3. There may be a gap with the portion 33. Moreover, the shape of the base end side suppression part 13 is not restricted to a rod shape, and may be a plate shape, and the side side suppression part 14 is not limited to a plate shape and may be a rod shape.

Explanatory drawing which shows the state with which the positioning member of this embodiment is mounted | worn with the glass syringe. (A) thru | or (c) is explanatory drawing which shows the detail of the positioning member of this embodiment. Explanatory drawing which shows the relationship between the plunger and the positioning member in the state which orient | assigned the front-end | tip part of the barrel upwards. Explanatory drawing which shows the relationship between the plunger and the positioning member in the state which orient | assigned the front-end | tip part of the barrel downward. (A) And (b) is explanatory drawing which shows the conventional holder, (c) is explanatory drawing which shows the shape of the flange part of a barrel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Positioning member, 2 ... Syringe, 3 ... Barrel, 4 ... Plunger, 11 ... Holding part, 12 ... Extension part, 12a ... Front side suppression part, 12b ... Handle, 12c ... Recessed part, 12d ... Notch part, 13 ... Proximal end side deterrence part, 14 ... side side deterrence part, 32 ... barrel side flange part, 33 ... barrel body part, 44 ... plunger side flange part.

Claims (4)

A cylindrical barrel made of glass and a glass plunger slidable in the barrel, and has a barrel-side flange portion projecting in an outer peripheral direction at a proximal end portion of the barrel, and a proximal end of the plunger In a glass syringe having a plunger side flange projecting in the outer peripheral direction at the part, a positioning member for positioning the plunger so that the plunger does not collide with the barrel,
A holding part mounted on the barrel outer periphery of the barrel;
An extending part extending from the holding part to the proximal side in the axial direction beyond the barrel side flange part and the plunger side flange part;
A proximal-side deterring portion extending from the extending portion to the opposite side of the plunger across the plunger-side flange portion;
A lateral side restraining portion extending from the proximal side restraining portion to the distal end side of the plunger,
The lateral side restraining portion is located on the proximal side with respect to the plunger side flange portion in a state where the plunger is located on the distal end side in the barrel, and the plunger side flange portion is in contact with the proximal end side restraining portion. A plunger positioning member which faces the side of the plunger side flange portion in a contact state. The plunger positioning member according to claim 1,
The extension part protrudes toward the plunger side at a position ahead of the base end side restraining part, and prevents the abutment on the distal end side inside the barrel when the plunger moves forward. A plunger positioning member comprising a front-side restraining portion that abuts against the flange portion. A plunger positioning member according to claim 1 or 2,
The extending portion has a cutout portion at a location facing the barrel side flange portion, and when the holding portion is attached to the outer periphery of the barrel portion of the barrel, the cutout portion protrudes maximum in the barrel side flange portion. A plunger positioning member, wherein the plunger positioning member is positioned outside the portion. A positioning member for a plunger according to any one of claims 1 to 3,
A plunger positioning member comprising a handle projecting outward in the thickness direction at a central portion in the axial direction of the extending portion.

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