JPH07148262A - Needle base unit for injector and syringe as well as structure for connecting the needle base unit and the syringe - Google Patents

Abstract

PURPOSE:To enhance the versatility of an injector by enabling the easy connection and insertion of an injection needle and hub on treatment site, etc. CONSTITUTION:This needle base unit has a hub body 10 formed to a columnar shape. An end face 10a is formed on one end side of the hub body 10 and the end face 10a side of the hub body 10 is provided with an engaging and holding circular cylindrical part 11 having the outside diameter smaller than the outside diameter of the hub body 10. The injection needle 21 is connected to the engaging and holding circular cylindrical part 11 and the one side of the hub body 10 on the side opposite to its one end side is provided with a piston engaging hole 15. A hub stop groove 10c is annularly formed on the outer peripheral surface side of the hub body 10. The engaging and holding circular cylindrical part 11 is provided with a hub fixing member 61 formed with the hub engaging hole 62 in the form of freely removably inserting the engaging and holding circular cylindrical part 11 into the hub engaging hole 62. A syringe engaging projection 63 is formed at the hub fixing member 61.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle base unit for a syringe, a syringe, and a connecting structure for connecting the needle base unit and the syringe, which is suitable for application to a disposable syringe.

[0002]

2. Description of the Related Art Conventionally, in a disposable syringe, immediately after use, an injection needle is inserted into a syringe that cannot be touched directly by the hand, etc. A syringe having a needle accommodating function has been proposed which can prevent accidents caused by damage and secondary infection.

[0003]

By the way, depending on the application, a plurality of types of injection needles for one syringe or a plurality of types of syringes for one injection needle may be used in a treatment site or the like. It is desired to increase the versatility of the syringe by selecting and connecting immediately before performing the injection operation, but in the conventionally proposed disposable syringe, the injection needle and a hub for connecting the injection needle to the syringe are provided. It was difficult to easily connect and attach the to the syringe at the treatment site or the like. In view of the above circumstances, the present invention makes it possible to easily connect and insert an injection needle and a hub to a syringe at a treatment site or the like in a disposable syringe, thereby increasing the versatility of the syringe. An object is to provide a needle base unit, a syringe, and a connection structure between the needle base unit and the syringe.

[0004]

That is, the first invention of the present invention has a hub body (10) formed in a columnar shape,
An abutting end portion (10a) is formed on one end side of the hub body (10), and an outer diameter (L2) is on the abutting end portion (10a) side of the hub body (10). Outer diameter of (L
1, L1 ') is provided with an engagement holding portion (11) smaller than
An injection needle (21) is connected to the engagement holding portion (11), a pair of piston engagement means (15) is provided on the hub body (10) on the side opposite to the one end side, and the hub body (10) is provided. A reaction force fixing member (61) in which a syringe engaging means (10c) is formed in an annular shape on the outer peripheral surface (10f) side, and a hub engaging hole (62) is formed in the engagement holding portion (11). Is engaged with the hub engagement hole (62) in such a manner that the engagement holding portion (11) is inserted and removed freely, and the reaction force fixing member (6) is provided.
In 1), a means for fixing a syringe (63) was formed. A second invention of the present invention has a cylindrical syringe body (2), and a hub formed in a cylindrical shape on the distal end side of the syringe body (2) via a hub introduction opening (7g). The hub insertion portion (7) is formed, and the counter force fixing member engaging means (7c) is formed on the outer peripheral surface (7f) side of the hub insertion portion (7). A hub engaging means (7d) is formed in an annular shape on the inner peripheral surface (7a) side. The third invention of the present invention is the needle base unit (60) according to the first invention.
And a syringe (100) of the second invention, in the hub insertion part (7), the hub body (1
0) such that the contact end (10a) side of the hub body (10) faces the syringe body (2), and the hub body (10) is connected to the syringe engagement means (10c). The hub insertion portion (7) is provided so as to be detachably engaged with the hub engagement means (7d), and the hub insertion portion (7) faces the outer peripheral surface (7f) side. Force fixing member (61)
Opposing force fixing member engaging means (7c) of the hub insertion portion (7)
And means for fixing the syringe to the reaction force fixing member (61) (6)
3) are mounted and provided in the form of being engaged with each other.

The numbers in parentheses () indicate the corresponding elements in the drawings for the sake of convenience, and the present description is not limited to the description in the drawings. The same applies to the following action columns.

[0006]

In the first aspect of the present invention having the above-described structure, the needle base unit (60) is provided with a syringe (10) for a syringe.
0), the reaction force fixing member (61) of the needle base unit (60) is engaged and fixed to the syringe (100) via the syringe fixing means (63), so that the hub body (10) abuts. The end (10a) side is indirectly supported by the syringe (100) via the reaction force fixing member (61). Further, in the second invention of the present invention, a syringe (100)
The reaction force fixing member (61) of the needle base unit (60) is engaged and fixed to this via a counter force fixing member engaging means (7c). Further, in the third aspect of the present invention, when forming the connection structure according to the present invention, the needle base unit (60) is easily connected through the hub introduction opening (7g) of the syringe (100).

[0007]

1 is a cross-sectional view showing a connecting portion of an example of a needle base unit according to the present invention and an example of a syringe according to the present invention, and FIG. 2 is an application of the needle base unit and the syringe shown in FIG. 1 is a cross-sectional view showing the entire injection syringe, and FIG.
FIG. 4 is a view showing a state in which a storage cap is attached to the needle base unit shown in FIG. 4, and FIG. 4 is a view showing a piston breaking operation in the syringe shown in FIG.

As shown in FIG. 2, the syringe 1 in the state immediately before the injection operation, that is, in the state in which the injection needle and the syringe are connected, has a resin syringe 100, and the syringe 100 is A syringe body 2 is provided (note that FIG. 2 is a schematic cross-sectional view of the syringe 1, but for convenience, a part of a piston 23 to be described later does not show a cross-section but a side surface). Further, the syringe body 2 is provided with a main cylindrical portion 3 formed in a cylindrical shape. Here, the axial direction of the main cylindrical portion 3, that is, both the forward and reverse directions parallel to the axial center Q1, are the direction of arrow A in the figure (that is, the left direction on the paper surface of FIG. 2) and the direction of the arrow B (the right direction on the paper surface of FIG. 2). ). On the outer peripheral side of the main cylindrical portion 3, the arrow B side of the main cylindrical portion 3 (the right side in the drawing of FIG. 2)
In the vicinity of the open end 3a, the syringe support portion 5 is provided in a brim shape with respect to the main cylindrical portion 3, and on the inner peripheral surface 3c side of the main cylindrical portion 3, near the open end 3a, A locking rib 3b protruding in the direction toward the axis Q1 of the main cylindrical portion 3, that is, in the direction of the arrow D in the drawing is formed in an annular shape along the inner peripheral surface 3c. The arrow A side of the main cylindrical portion 3 is shown in FIG.
Further, as shown in FIG. 2, a funnel-shaped tapered portion 6 whose inner diameter is reduced by a predetermined ratio K1 in the direction of arrow A is formed integrally with the main cylindrical portion 3. The interior of the main cylindrical portion 3 and the interior of the tapered portion 6 communicate with each other in the directions of arrows A and B, and the space obtained by combining these interiors is referred to as an internal space 2a of the syringe body 2.

On the arrow A side of the taper portion 6, that is, on the distal end side of the syringe main body 2, a hub insertion portion 7 is integrally formed with the taper portion 6 as shown in FIGS. Has been formed. The hub insertion portion 7 is formed in a cylindrical shape concentric with the main cylindrical portion 3, and the inner diameter of the hub insertion portion 7 is smaller than the inner diameter of the main cylindrical portion 3. A hub insertion hole 7b is formed on the inner peripheral surface 7a side of the hub insertion portion 7, and a hub stop rib 7d protruding toward the axis Q1 is formed in the hub insertion hole 7b. The hub stop rib 7d is formed in an annular shape along the inner peripheral surface 7a.
The cross section of the plane including the axis Q1 (that is, the cross section shown in FIGS. 1 and 2) has an arc shape.
On the other hand, on the outer peripheral surface 7f side of the hub insertion portion 7, a hub fixing member engagement groove 7c is provided in an annular shape along the outer peripheral surface 7f. Further, the tip end portion of the hub insertion portion 7 on the arrow A side is an open end portion 7g, and the inner diameter of the hub insertion portion 7 (in a state where it is not elastically deformed) is equal to that of the hub stop rib 7d. Except for this, the size is constant from the end on the arrow B side that is the boundary with the tapered portion 6 to the end on the arrow A side that is the opening end 7g. The hub insertion portion 7 is configured as described above, and in the syringe 100, the syringe support portion 5, the main cylindrical portion 3 forming the syringe body 2, the taper portion 6, and the hub insertion portion 7 are integrally molded. It is configured in a form.

A needle base unit 60 is connected to the syringe 100, and the needle base unit 60 is composed of a hub 9, an injection needle 21, and a hub fixing member 61, as shown in FIG. The hub 9 of the needle base unit 60 includes the syringe 10
It is provided in the hub insertion hole 7b of the hub insertion portion 7 of 0,
The hub 9 has a hub body 10 as shown in FIG. The hub body 10 has a longitudinal direction parallel to the directions of the arrows A and B, and is formed in a columnar shape with the axis Q1 as the axis. The outer diameters of the hub body 10 on the arrow B side are the outer diameter L1 and the arrow A side. Has an outer diameter L1 'smaller than the outer diameter L1. That is, the hub body 10 is formed in a columnar shape having a step portion 10g due to the difference in outer diameter. In addition, a hub stop groove 10c is formed on the outer peripheral surface 10f side of the portion of the hub body 10 having the outer diameter L1, and the hub stop groove 10c is formed in an annular shape along the outer peripheral surface 10f. The arrow A side of the hub body 10 (therefore, the arrow A side of the outer diameter L1 'portion of the hub body 10)
On the end face 10a side of the, the shape of extending in the directions of arrows A and B,
An engagement holding column portion 11 having an outer diameter L2 smaller than the outer diameter L1 'is provided concentrically and integrally with the hub body 10. In the hub 9, the outer diameter L1 portion of the hub body 10 is inserted into the hub insertion hole 7b of the hub insertion portion 7, and the outer diameter L1 'portion of the hub body 10 and the engagement holding column portion 11 are inserted. Is provided so as to project to the outside of the opening end 7g, that is, the arrow A side. In addition, the hub stop rib 7 of the hub insertion portion 7
d and the hub stop groove 10c of the hub 9 are present at positions corresponding to each other. Therefore, the hub stop rib 7d has its tip end on the arrow D side aligned with the hub stop rib 7d. And is engaged with the hub stop groove 10c by being inserted into the hub stop groove 10c. In addition, as shown in FIG. 1, the width of the hub stop rib 7d in the directions of arrows A and B is, as shown in FIG.
Since it is wider than the width in the direction of arrows A and B, the hub stop rib 7d
Is the seal portion 7 on the arrow A side and the arrow B side of its tip.
In e and 7e, the hub stop groove 10c is in contact with the open end portions 10e and 10e on both sides of the arrows A and B of the hub stop groove 10c.
Is engaged with. The inner peripheral surface 7a of the hub insertion portion 7 is
Except for the hub stop rib 7d, the hub 9 does not contact the outer peripheral surface 10f of the hub 9, and a gap space 12 is formed between the inner peripheral surface 7a and the outer peripheral surface 10f. That is, since the contact between the inner peripheral surface 7a side of the hub insertion portion 7 and the hub 9 is performed only between the hub stop rib 7d and the outer peripheral surface 10f side of the hub 9, the hub 9 is attached to the syringe 100. During insertion, the hub 9 can be easily inserted into the hub insertion portion 7, and the hub 9 can be easily pulled out from the hub insertion portion 7 when the injection needle is housed later. (However, if the hub 9 can be easily inserted into and removed from the hub insertion portion 7 and the hub 9 can be easily pulled out from the hub insertion portion 7, the hub stopper of the inner peripheral surface 7a of the hub insertion portion 7 can be easily removed. A portion other than the rib 7d may be in contact with the outer peripheral surface 10f of the hub 9.). The end surface 10b of the hub body 10 on the arrow B side is closer to the arrow A than the boundary between the hub insertion hole 7b and the internal space 2a (that is, the boundary between the inside of the hub mounting portion 7 and the inside of the tapered portion 6). The hub insertion hole 7b
The space on the arrow B side of the end surface 10b of the inside of the inside is a hole internal space 7h. On the other hand, the hub insertion portion 7 is elastically deformed in the state where the hub insertion portion 7 is provided with the hub 9 and the hub insertion portion 7 is expanded in the direction of arrow C.
That is, the restoring force due to the elastic deformation of the hub insertion portion 7 is transmitted to the hub 9 via the hub stop rib 7d of the hub insertion portion 7. That is, between the hub stop rib 7d and the hub 9, the seal portion 7e and the hub stop groove 10c, which are contact points between them, are provided.
A predetermined sealing pressure due to the restoring force acts on the opening end portion 10e of each other, and the sealing portion 7e and the opening end portion 10e are watertight or airtight.

Further, as shown in FIG. 1, the hub 9 is provided with a needle insertion hole 13, and the needle insertion hole 13 is formed in the hub 9.
A circular opening 13a is formed on the end surface 11a of the engagement-holding cylindrical portion 11 on the arrow A side, and the circular opening 13a is centered on the axis Q1, and is provided in a form extending from the end surface 11a in the arrow B direction. . In addition, the end portion 1 of the needle insertion hole 13 on the arrow B side
3b reaches the inside of the hub body 10 and the end portion 1
3b is in contact with the wall surface 10d formed by the hub body 10.
In addition, a taper portion in which the diameter of the needle insertion hole 13 converges in the direction of the arrow B is appropriately formed in the middle of the needle insertion hole 13. On the other hand, in the hub body 10, the flow hole 13 is formed so as to be adjacent to the arrow B side of the needle insertion hole 13 (on the right side in the drawing of FIG. 1).
c is provided, and the flow hole 13c is provided in a cylindrical shape having a diameter smaller than the diameter at the end portion 13b of the needle insertion hole 13 with the axis Q1 as the center. Also, the circulation hole 13c
Is provided in communication with the needle insertion hole 13 in the form of forming a circular opening on the wall surface 10d of the hub body 10. Further, in the hub body 10, a piston engaging hole 15 having a circular cross section perpendicular to the axis Q1 is provided concentrically with the axis Q1 so as to communicate with and adjoin to the arrow B side of the flow hole 13c. The arrow B side of the piston engagement hole 15 is open to the outside at the end surface 10b of the hub body 10. The piston engagement hole 15 is composed of two portions, an engagement holding portion 16 on the arrow A side and an introduction portion 17 on the arrow B side.
Is a substantially columnar shape concentric with the axis Q1, and both ends on the arrow A side and the arrow B side are tapered so that the diameters converge toward the arrow A direction and the arrow B direction, respectively. Further, the end portion side of the engagement holding portion 16 on the arrow A side is communicatively connected by the circulation hole 13c. The introduction portion 17 is in communication with and adjoins the end portion of the engagement holding portion 16 on the arrow B side, and the diameter of the introduction portion 17 increases in the arrow B direction. Therefore, in the hub body 10, the engagement holding portion 16
Wall surface 16a facing the wall and wall surface 17a facing the introducing portion 17
The portion sandwiched by and is the engagement holding portion 16 and the introduction portion 1
A projecting portion 20 projecting toward the axis Q1 is formed with the boundary portion 19 with 7 as the apex.

On the other hand, the injection needle 21 of the needle base unit 60 is
As shown in FIG. 1, the injection needle 21 is inserted into the needle insertion hole 13 of the hub 9, the distal end side of which is located outside the syringe body 2, and the injection needle 21 is inserted into the needle insertion hole 13 from the rear end side. ing. Further, the rear end of the injection needle 21 is in contact with the wall surface 10d formed on the arrow B side of the needle insertion hole 13, and is a medium circulation hole penetrating from the tip of the injection needle 21 to the rear end side. 21a and the circulation hole 13c communicate with each other in the directions of arrows A and B and are adjacent to each other. An adhesive 22 is injected into the needle insertion hole 13 so as to fill the space between the injection needle 21 and the hub 9 and is solidified.

Further, the hub fixing member 6 of the needle base unit 60.
As shown in FIG. 1, reference numeral 1 denotes an opening end portion 7g of the hub insertion portion 7.
And a fixing member main body 61a formed in a shape capable of covering the vicinity of the opening end portion 7g of the hub insertion portion 7 from the outer peripheral surface 7f side of the hub insertion portion 7. That is, the fixing member main body 61a covers the opening end portion 7g of the hub insertion portion 7 and covers the reaction force wall portion 61d perpendicular to the directions A and B and the outer peripheral surface 7f side of the hub insertion portion 7. Cylindrical tube portion 61e
And a connection portion 61f that connects the reaction force wall portion 61d and the tubular portion 61e. A hub engaging hole 62 is formed in the reaction force wall portion 61d so as to penetrate the reaction force wall portion 61d in the directions of arrows A and B. It is formed in a tapered shape with a reduced diameter. That is, the hub fixing member 61 has the tubular portion 61.
The hub is attached to the hub insertion portion 7 such that the vicinity of the opening end portion 7g side of the hub insertion portion 7 is inserted into the syringe insertion hole 61c which is inside e, and the hub formed in the reaction force wall portion 61d. The engagement holding column portion 11 of the hub 9 is provided in the engagement hole 62 so as to be engaged with the hub 9 so as to penetrate therethrough. In addition, when the engagement holding column portion 11 penetrates through the hub engaging hole 62, the fixing member main body 61 a is inserted into the hub engaging hole 62.
And the engaging and holding columnar portion 11 press against each other in the directions of arrows C and D, and the force of this pressing forces the fixing member main body 6
The hub engaging hole 62 is provided between the engagement holding column portion 1a and the engagement holding column portion 1a.
In the contact area between the two 61a and 11 in the above, a predetermined frictional force in the directions of arrows A and B can relatively act between the two 61a and 11. On the other hand, on the inner peripheral surface 61b side of the tubular portion 61e of the fixing member main body 61a, a syringe engaging protrusion 63 is formed in an annular shape so as to project along the inner peripheral surface 61b. The formation position corresponds to the position of the hub fixing member engagement groove 7c of the hub insertion portion 7. Therefore, the fixing member body 61a
In the state in which is attached to the hub insertion portion 7, the position of the syringe engaging protrusion 63 and the position of the hub fixing member engaging groove 7c correspond to each other, and the syringe engaging protrusion 63 is attached to the hub fixing member. The mating groove 7c is inserted and engaged. That is, the hub fixing member 61 includes the syringe engaging protrusion 6
3 and the hub fixing member engagement groove 7c are attached to the hub insertion portion 7 in a form of being engaged with each other. The side portion 6 of the syringe engaging protrusion 63, which is the portion on the arrow B side of the top portion 63a located closest to the arrow D side of the syringe engaging protrusion 63.
3b shows the arrow C gently as it goes in the direction of arrow B.
It is formed in a shape inclined in the direction. Therefore, when the hub fixing member 61 is attached to the hub insertion portion 7 in a direction of pressing in the direction of the arrow B, the side portion 63b contacts the opening portion of the hub insertion portion 7 that abuts on the side portion 63b. Since the force in the direction of arrow C is received from 7g or the like, the tubular portion 61e is effectively expanded in the direction of arrow C, and the hub fixing member 61 can be smoothly attached to the hub insertion portion 7. In addition, the side portion 63c of the syringe engaging protrusion 63, which is the portion on the arrow A side of the top portion 63a, has a predetermined shape (in FIG. 1, a wall surface perpendicular to the arrow A and B directions).
Is formed in. Therefore, in the state where the syringe engaging protrusion 63 and the hub fixing member engaging groove 7c are engaged with each other, the side portion 63c and the hub inserting portion 7 are separated from each other by the hub fixing member engaging groove 7
At the contact portion of the both 63c and 7 in c, these both 63c and 7 can apply force to each other only in the directions of arrows A and B. That is, after the syringe engaging protrusion 63 and the hub fixing member engaging groove 7c are engaged with each other, even if the hub fixing member 61 is pulled in the arrow A direction with respect to the syringe 100, the fixing member main body 61a does not engage with the syringe engaging member. Arrow B from the syringe 100 through the protrusion 63
Since the reaction force is applied only in the direction, the cylindrical portion 61e is not expanded in the direction of the arrow C, and the engagement between the syringe engaging protrusion 63 and the hub fixing member engaging groove 7c is not disengaged. The needle base unit 60 is composed of the hub 9, the injection needle 21, and the hub fixing member 61 as described above.
The hub 9 to which the injection needle 21 is connected is provided in the hub insertion hole 7b, and the hub fixing member 61 engaged with the hub 9 and attached to the hub insertion portion 7 is connected to the syringe 100. There is.

As shown in FIG. 2, the syringe 1 is provided with a piston 23 (note that FIG. 2 is a schematic cross-sectional view of the syringe 1; For convenience, the outer pressing plate 27, the inner pressing plate 29, the packing support portion 30, and the hub engaging portion 31 are shown not in cross section but in side surfaces. The piston 23 has a rod-shaped piston main body 25 extending in the directions of arrows A and B, and the piston main body 25 has two congruent flat plate portions 25a of a rectangular plate that are elongated in the directions of arrows A and B. The cross-sections are formed in a cross shape and are integrally intersected with each other. Flat plate part 2
The width of the plate surface of 5a perpendicular to the directions of arrows A and B is substantially equal to the inner diameter of the locking rib 3b of the main cylindrical portion 3, and the piston body 25 is The cylindrical portion 3 is provided so as to be inserted through the open end portion 3a. Each flat plate portion 25a of the piston body 25
Is provided with a wedge-shaped notch 26 in the direction of the axis (that is, the axis Q1) of the piston body 25 from both sides of each flat plate portion 25a on the arrow A side. 4 notches 2
6 is provided at a position aligned with each other in the directions of arrows A and B. A circular plate-shaped outer pressing plate 27 having a plate surface perpendicular to the directions of arrows A and B is integrally provided with the piston body 25 on the end portion side of the piston body 25 on the arrow B side. A circular plate-shaped inner pressing plate 29 having a plate surface perpendicular to the directions of arrows A and B is provided integrally and concentrically with the piston body 25 on the end portion side of the piston body 25 on the arrow A side. (Therefore, the inner pressing plate 29 is located inside the main cylindrical portion 3), and the diameter of the inner pressing plate 29 is substantially equal to the inner diameter of the main cylindrical portion 3 (therefore, the inner pressing plate 29 The diameter is larger than the inner diameter of the locking rib 3b of the main cylindrical portion 3.). As shown in FIG. 1, the inner pressing plate 29 is provided with a packing support portion 30 on the arrow A side thereof, and the packing support portion 30 has a cylindrical columnar portion 30a extending in the directions A and B. Are provided concentrically with the inner pressing plate 29. The diameter of the cylindrical portion 30a is smaller than the diameter of the inner pressing plate 29, and the cylindrical portion 30a is indicated by the arrow A of the inner pressing plate 29.
It is provided integrally with the inner pressing plate 29 on the side. On the arrow A side of the columnar portion 30a, as shown in FIG.
A cylindrical insertion columnar portion 30b extending concentrically with a in the directions of arrows A and B and having an outer diameter substantially equal to the inner diameter of the hub insertion portion 7 is provided integrally with the columnar portion 30a. . Furthermore, a hub engaging portion 31 is provided on the arrow A side of the inserting columnar portion 30b, and the hub engaging portion 31 has a cylindrical columnar portion 31a extending in the directions of arrows A and B and an inserting columnar portion 31a. 30b
It is provided concentrically with. The diameter of the columnar portion 31a is smaller than the diameter of the inserted columnar portion 30b.
a is the insertion columnar portion 30b on the arrow A side of the insertion columnar portion 30b.
It is provided integrally with b. On the arrow A side of the cylindrical portion 31a, a hemispherical insertion portion 31b having a diameter larger than that of the cylindrical portion 31a.
However, the cylindrical portion 31a is formed so that the spherical surface 31c side faces the arrow A side.
The insertion portion 31b is provided with a plurality of streak-shaped grooves 32 along the spherical surface 31c from the arrow A side tip portion toward the arrow B side. The diameter of the cylindrical portion 31a is substantially equal to the inner diameter of the boundary 19 of the piston engagement hole 15 provided in the hub 9, and therefore the diameter of the insertion portion 31b is larger than the diameter of the boundary 19. It is getting bigger. The insertion portion 31b is sized to be sufficiently inserted and held in the engagement holding portion 16 of the piston engagement hole 15.

On the other hand, as shown in FIG. 1, a packing 33 made of a flexible resin is supported and provided on the packing supporting portion 30. The packing 33 is a syringe 1
00 has a packing main body 35 that is aligned and inserted into the main cylindrical portion 3 of 00, and the packing main body 35 has an engagement hole 3 that penetrates the packing main body 35 in the directions of arrows A and B.
5a is provided. Further, in the engagement hole 35a, the columnar portion 30a of the packing support portion 30 and the insertion columnar portion 30b.
Is partially penetrated. That is, the packing 33 is engaged with the packing support portion 30 in a manner of penetrating the packing support portion 30 into the engagement hole 35a, and is provided by being supported by the packing support portion 30 by the engagement. A support surface 35h perpendicular to the arrow A and B directions is formed at the end of the packing main body 35 on the arrow B side, and the support surface 35h is susceptible to the force in the arrow A direction by the inner pressing plate 29. In addition, it is in contact with the inner pressing plate 29. Further, the packing 33 and the columnar portion 30a in the engagement hole 35a.
Is in a close contact state, that is, in a water-sealed state. Further, inside the packing body 35, a hollow clearance space 35f is formed so as to surround the engagement hole 35a from the arrow C side and communicate with the engagement hole 35a adjacently (hence, the clearance). The space 35f has an arrow A
The side, the arrow B side, and the arrow C side are surrounded by the packing main body 35, and are in contact with the insertion columnar portion 30b of the packing support portion 30 on the arrow D side. ). In the portion of the engagement hole 35a on the arrow A side of the clearance space 35f, the packing 33 and the insertion columnar portion 30b are in contact with each other, but are not in a close contact state, that is, in a water-sealed state. .
That is, air or liquid may flow between the clearance space 35f and the outside of the packing body 35 on the arrow A side through the engagement hole 35a. The packing body 35 has a tapered portion 35b on the arrow A side. The inner shape of the tapered portion 6 of the syringe body 2 is a tapered shape whose inner diameter is reduced in the direction of arrow A at a predetermined rate K1 as described above, whereas the tapered portion 35b is in a natural state. Is a tapered shape whose outer diameter is reduced by a predetermined rate K2 which is larger than the predetermined rate K1. That is, when the tapered portion 35b in a natural state contacts the inside of the tapered portion 6 and the end portion 35d on the arrow B side of the tapered portion 35b contacts the inner peripheral surface 6a of the tapered portion 6, the tapered portion 35b is tapered. Part 3
A spare space 51 is formed between the surface 35e other than the end portion 35d of 5b (that is, a liquid pressing surface that can press the injection medium) and the inner peripheral surface 6a of the tapered portion 6. The packing support portion 30 is in a state of penetrating the engagement hole 35a.
The part of the insertion cylindrical portion 30b on the arrow A side is a tapered portion 35.
It projects further to the arrow A side than b. When the tapered portion 35b of the packing 33 is in a natural state, the end portion 35d of the tapered portion 35b is connected to the tapered portion 6 of the syringe body 2.
In the state of being brought into contact with the inside of the syringe, as shown in FIG. 1, the insertion column portion 30b of the packing support portion 30 engaging the packing 33 is in a state of being inserted into the hub insertion hole 7b of the syringe body 2. , Spherical surface 3 of insertion portion 31b of hub engaging portion 31
The shape of the packing 33 is set so that 1c is in contact with the wall surface 17a of the piston engagement hole 15 that faces the introduction portion 17. The outer diameter of the packing main body 35 of the packing 33 is substantially the same as that of the inner pressing plate 29. However, on the outer peripheral side of the packing main body 35, a circular ring shape along the outer circumference of the packing main body 35 is formed. Folds 35c are doubled in the directions of arrows A and B. Therefore, the packing 33 is inserted into the main cylindrical portion 3 of the syringe body 2 in such a manner that the vicinity of the fold 35c of the packing body 35 is contracted by elastic deformation in the direction toward the axis Q1, that is, in the direction of arrow D. That is, the packing 33 and the main cylindrical portion 3 are
The folds 35c and the inner peripheral surface 3c are in close contact with each other, and the space between the packing 33 and the main cylindrical portion 3 is sealed with a water seal. Further, the outer peripheral side of the packing main body 35, that is, the surface on the side where the folds 35c and the like are formed, has a sliding surface 35g facing the inner peripheral surface 3c of the syringe main body 2.
The packing 33 is in contact with the inner peripheral surface 3c at the sliding surface 35g. Inner peripheral surface 3c and sliding surface 35
Since g is formed smoothly, the piston 23 with the packing 33 inserted therein is slidable in the internal space 2a of the main cylindrical portion 3 in the directions of arrows A and B.

The injector 1 in the state immediately before the injection operation, that is, in the state where the injection needle 21 and the syringe 100 are connected.
Is configured as described above. By the way, the syringe 1 in the stored state, that is, in the state where the injection needle 21 and the syringe 100 are not yet connected, is as follows. That is, the syringe 1 in the stored state has the syringe 100, and the syringe 100 is provided with the piston 23 in a state of being inserted into the internal space 2a of the syringe body. In addition, the syringe 1 in a stored state
Has a needle base unit 60 separated from the syringe 100 (not connected). In the syringe 1 in the stored state, the needle base unit 60
As shown in FIG. 3, a storage cap 70 is attached to the. The storage cap 70 has a cap body 700 formed in a tubular shape extending in the directions of arrows A and B, and the end side of the cap body 700 on the arrow A side is closed, and the cap body 700 is closed. The end on the arrow B side is open. Inside the cap body 700, a cylindrical needle storage space 70a extending in the direction of arrow B from the end side on the arrow A side is provided, and on the arrow B side of the needle storage space 70a, A fixing member insertion space 70b into which the fixing member main body 61a of the needle base unit 60 can be inserted is provided continuously to the needle storage space 70a. The end portion of the fixing member insertion space 70b on the arrow B side is the cap body 7.
00 is opened to the outside in the form of forming an opening 70c, and as described above, the opening 70c forms the cap body 7
The end portion side of arrow 00 on the side of arrow B is open. In the storage cap 70 as described above, the tip side of the injection needle 21 is in the needle storage space 70a of the storage cap 70, and the fixing member main body 61 is in the fixing member insertion space 70b of the storage cap 70.
The needle base unit 60 is attached by inserting a.
In the mounted state, the cap main body 700 and the fixing member main body 61a in the fixing member insertion space 70b are closely fixed to each other by applying a predetermined pressure in the directions of arrows C and D. In the needle storage space 70a,
The tip of the injection needle 21 is not in contact with the cap body 700. Further, the fixing member insertion space 70b is provided in the fixing member main body 6
Since it is formed in a shape corresponding to 1a, the connecting portion 61f of the fixing member main body 61a inserted into the fixing member insertion space 70b is the connecting portion 61f of the surface of the cap main body 700 on the side of the fixing member insertion space 70b. Is in contact with the contact surface 70d corresponding to. The syringe 1 in the stored state, that is, in the state where the injection needle 21 and the syringe 100 are not yet connected, is configured as described above. In addition, between the hub 9 and the hub fixing member 61, as described above,
Since the engagement holding column portion 11 penetrates the hub engagement hole 62 and engages with the hub engagement hole 62, the hub 9 and the hub fixing member 61 are fixed to each other. Since the cap body 700 and the hub fixing member 61 are also fixed to each other as described above, the three members of the hub 9, the hub fixing member 61, and the storage cap 70 are fixed to each other. That is, in the syringe 1 in the stored state, the hub 9 and the hub fixing member 61 are
However, since the injection needle 21 is inserted and stored in the storage cap 70 and the hub 9, the hub fixing member 61, and the storage cap 70 are not accidentally separated, they are attached to the storage cap 70. Storage management of the needle base unit 60 can be performed safely.

Since the syringe 1 in the state immediately before performing the injection operation and the syringe 1 in the stored state are configured as described above, immediately before performing the injection operation in the syringe 1 in the stored state. Therefore, in order to dispose of the product after it has been used, and then discarded, use the following procedure. First,
The injection practitioner (not shown) has a needle base unit in which the storage cap 70 having the injection needle 21 having a length and a diameter suitable for injection is attached to the syringe 1 in the stored state. 60 is selected and connected to the syringe 100 in which the piston 23 is inserted. When connecting,
After aligning the end surface 10b side of the hub 9 of the needle base unit 60 and the arrow B side of the syringe insertion hole 61c of the hub fixing member 61, that is, the opening end portion 61g with the opening end portion 7g of the hub insertion portion 7, storage The needle base unit 60 together with the cap 70 is pressed in the direction of arrow B according to the syringe 100 side. Since the contact surface 70d on the inner side of the storage cap 70 and the connecting portion 61f of the hub fixing member 61 are in contact with each other in such a manner that stress can be applied in the directions of arrows A and B, the hub fixing member 61 is also included. Since the reaction force wall portion 61d and the end surface 10a of the hub 9 are in contact with each other (or are close to each other) so as to apply stress in the directions of arrows A and B, the storage cap 70 is pressed in the direction of arrow B. When doing, through the storage cap 70,
The hub fixing member 61 and the hub 9 are pressed in the arrow B direction. Since the outer diameter L1 of the hub body 10 is smaller than the inner diameter of the hub insertion portion 7 including the open end portion 7g, the hub body 10 is inserted into the hub insertion hole 7b in the direction of arrow B. When the insertion is further continued, the outer peripheral side of the hub body 10 comes into contact with the hub stop rib 7d inside the hub insertion portion 7. Since the inner diameter of the hub insertion portion 7 is smaller than the outer diameter of the hub main body at the portion of the hub stop rib 7d, the side portion on the arrow A side of the hub stop rib 7d contacts the hub main body. However, since the cross section of the hub stop rib 7d is formed in an arc shape, the vicinity of the end surface of the hub body applies a pressing force to the side portion, and the pressing force is based on the arc shape of the cross section.
The hub insertion portion 7 acts as a force to inflate and deform the hub insertion portion 7 in the direction of the arrow C, so that the hub insertion portion 7 inflates and deforms so as to enlarge its inner diameter. Due to the expansion deformation, the insertion is done smoothly.
The position of d and the position of the hub stop groove 10c in the directions of arrows A and B are aligned. By aligning, the hub stop rib 7d and the hub stop groove 10c
Engage one another. The hub 9 is attached to the hub insertion portion 7 by the engagement.
Was attached to. In addition, the opening end portion 61 of the hub fixing member 61
From g, the opening end 7g side of the hub insertion portion 7 is inserted into the syringe insertion hole 61c. By the way, the inner diameter of the cylindrical portion 61e of the fixing member main body 61a is equal to the syringe engaging protrusion 63.
Since it is smaller than the outer diameter of the hub insertion portion 7 at
The vicinity of the opening end 7g of the hub insertion portion 7 is the syringe engagement protrusion 6
It contacts the side surface 63b of the No. 3 side. However, as described above, since the side portion 63b is formed so as to be gently inclined in the arrow C direction as it goes in the arrow B direction, the side portion 6b is formed.
3b receives a force in the direction of arrow C from the opening end 7g of the hub insertion portion 7 that contacts the side portion 63b. That is, since the cylindrical portion 61e is effectively expanded in the arrow C direction by the force in the arrow C direction, the hub insertion portion 7 can be smoothly inserted into the hub fixing member 61. By further pressing the hub fixing member 61, the syringe insertion hole 61
The hub insertion portion 7 is further inserted into c, and the syringe engagement protrusion 6
3 and the position of the hub fixing member engaging groove 7c of the hub insertion portion 7 in the directions of arrows A and B are aligned. Due to the alignment, the syringe engaging protrusion 63 and the hub fixing member engaging groove 7c are engaged with each other. The hub fixing member 61 was attached to the syringe 100 by the engagement. As described above, the hub 9 is inserted into the hub insertion portion 7 and the hub fixing member 61 is attached to the syringe 100, so that the needle base unit 60 is connected to the syringe 100. After the connection, the syringe 100 side is fixed and the storage cap 70 is pulled out in the direction of arrow A. At this time, a frictional force against a predetermined pressure is applied between the cap body 700 and the fixing member body 61a in the directions of arrows A and B.
Although it operates so as to hold a, as described above, since the fixing member main body 61a and the syringe 100 are fixed via the syringe engaging protrusion 63, the storage cap 70
Only the part is removed from the hub fixing member 61.
In this way, the syringe 1 was in the state in which the injection needle 21 and the syringe 100 were connected, that is, the state immediately before use.

Next, the syringe 1 is used. That is,
The injection needle 21 of the syringe 1 is advanced into the injection medium 52 contained in a drug bottle (not shown), the piston 23 is pulled in the direction of arrow B with respect to the syringe body 2, and the differential pressure causes
The injection medium 52 in the medicine bottle is passed through the medium circulation hole 21a of the injection needle 21, the circulation hole 13c of the hub 9, and the piston engagement hole 15, and the space inside the hole 7h of the hub insertion portion 7 and the syringe body 2 of the syringe body 2. The syringe 1 is caused to flow into the medium holding space 53 on the injection needle 21 side of the piston 23 in the internal space 2a.
Is filled with injection medium 52. When the injection medium 52 is filled, the hub 9 receives a pressure difference in the direction of arrow B due to the pressure difference between the outside and the medium holding space 53.
Since the restoring force of the arrow D in the direction of the arrow D is set to a predetermined value as described above, the arrow between the hub 9 and the hub insertion portion 7 is not affected by the expected maximum pressure difference. The seals between the seal portions 7e on the A side and the arrow B side and the open end portions 10e do not come off.

After the injection medium 52 is filled, the injection needle 21 of the injector 1 is pierced at an injection site of a patient (not shown). Next, the outer pressing plate 27 of the piston 23 is pushed in the direction of arrow A,
The piston 23 is driven in the direction of arrow A with respect to the syringe body 2. The injection medium 52 in the medium holding space 53 is pressurized and flows into the body at the injection site of the patient (not shown) through the piston engagement hole 15 of the hub 9, the flow hole 13c, and the medium flow hole 21a of the injection needle 21. To do. The injection medium 52 is pressurized and the hub 9 adjacent to the injection medium 52 is
From the end surface 10b side, the action force due to the pressure of the injection medium 52 is applied to the hub 9 in the direction of arrow A, but the restoring force of the hub insertion portion 7 in the direction of arrow D has a predetermined magnitude as described above. Therefore, even with respect to the expected maximum acting force, the seal portions 7e and the open end portions 10e on the arrow A side and the arrow B side between the hub 9 and the hub insertion portion 7 are set. The seal between them does not come off. After injecting the injection medium 52 up to a predetermined amount into the body of the patient at the injection site, the end portion 35d of the taper portion 35b of the packing 33 is brought into contact with the inside of the taper portion 6 of the syringe body 2 and the piston 23 As shown in FIG. 1, the insertion portion 31 b of the hub engaging portion 31 has a wall surface 17 in the introduction hole 17 of the piston engaging hole 15 of the hub 9.
After driving the piston 23 to a position abutting on a, that is, the injection end position P2 in the figure, the entire syringe 1 is pulled in the direction of arrow B with respect to the patient (not shown), and the injection needle 21 is pulled out from the injection site of the patient. .

After pulling out the injection needle 21, the operation for retracting the injection needle is performed as follows. In the injection needle storing operation, first, the engaging operation between the piston 23 and the hub 9 is performed as follows. That is, the outer pressing plate 27 of the piston 23 is further pressed with a finger in the direction of arrow A to press the piston body 25 in the direction of arrow A, and the insertion columnar portion 30b of the packing support portion 30 and the hub engaging portion 31 are pushed. , In the direction of arrow A in the hub insertion hole 7b. Immediately before starting the needle accommodating operation, the piston 23 is positioned such that the tapered portion 35b in the natural state is located inside the tapered portion 6, and the tapered portion 35b is located on the arrow B side. End portion 35d abuts on the inner peripheral surface 6a of the tapered portion 6, and a margin space 51 is formed between the surface 35e other than the end portion 35d of the tapered portion 35b and the inner peripheral surface 6a of the tapered portion 6. There is. Therefore, the piston body 2
In the packing 33, the portion of the packing 33 on the arrow B side from the vicinity of the end portion 35d in contact with the taper portion 6 is compressed in the arrow A and B directions by pressing in the arrow A direction of 5 while the other portion is the surface. 35e is pushed out in the direction of arrow A using the spare space 51 so as to approach the tapered portion 6. Therefore, since the amount of elastic compression in the packing 33 is reduced as much as possible by the extra space 51, the piston 23 can be operated with a force as small as possible. Further, since the clearance space 35f is formed inside the packing body 35, when the packing body 35 is elastically compressed, the clearance space 35f is also reduced together with the packing body 35. Therefore, since the amount of elastic compression in the packing 33 is reduced by the amount of the clearance space 35f, the piston 23 can be operated with a force as small as possible. Also,
Immediately before starting the operation of accommodating the injection needle, as shown in FIG. 1, the hole inner space 7h (that is, the medium holding space 53) existing between the end surface 10b of the hub 9 and the insertion cylindrical portion 30b on the piston 23 side. Also, the spare space 51 (that is, the medium holding space 53) is filled with the remaining injection medium 52. The remaining injection medium 52 is pressurized by starting the operation of accommodating the injection needle and pressing and moving the piston 23 in the direction of arrow A as described above. However, the insertion portion 31b is provided with the plurality of grooves 32 as described above, and the grooves 32 are not blocked even when the insertion portion 31b and the wall surface 17a are pressed and brought into contact with each other. Therefore, even when the insertion portion 31b and the wall surface 17a are pressed and brought into contact with each other, the space 7h in the hole, or the margin space 51 side and the engagement holding portion 16 side communicate with each other through these grooves 32. The pressurized injection medium 52 remaining in the space 7h or the spare space 51 flows toward the engagement holding portion 16 side through the grooves 32 (because of the space between the insertion columnar portion 30b and the hub insertion portion 7). Is not watertight, the injection medium 52 in the extra space 51
Can flow toward the space 7h in the hole through the space between the insertion columnar portion 30b and the hub insertion portion 7).
c, it is discharged to the outside through the medium flow hole 21a of the injection needle 21. That is, the injection needle storing operation is started and the piston 2
Even when 3 is pressed and moved in the direction of arrow A, the space in the hole 7h
Alternatively, the residual injection medium 5 pressurized in the extra space 51
2 is appropriately discharged to the outside and the pressure thereof is not increased as much as possible, so that the injection medium 5 remaining in the piston 23
The resistance due to the pressure of 2 is not applied as much as possible, and the piston 23 is pressed and moved in the direction of arrow A with the smallest possible force. Further, while the packing 33 is elastically contracted, the insertion columnar portion 30b of the packing support portion 30 and the hub engaging portion 31 are fixed to the hub insertion hole 7
In the direction of b, the hub engaging portion 3 is pushed and moved in the direction of arrow A.
The insertion portion 31b of No. 1 is pushed and moved in the direction of arrow A from the introduction portion 17 of the piston engagement hole 15 toward the engagement holding portion 16. That is, by pushing and moving the piston 23 in the direction of arrow A, the insertion portion 31 b is pushed by the wall surface 17 a of the introduction portion 17. However, the insertion portion 31b has a spherical surface 31c on the arrow A side, and therefore the insertion portion 31b
Is formed in a shape in which a cross section perpendicular to the axis Q1 shrinks in the direction of arrow A, and the insertion portion 31b has a spherical surface 31c.
Is pressed against the wall surface 17a at. In addition, the introduction unit 17
Also, the inside thereof is formed in a tapered shape that shrinks in the direction of arrow A. Therefore, the insertion portion 31b is inserted into the introduction portion 17
By pushing in the direction of arrow A at
1b and the projecting portion 20 forming the wall surface 17a, the stress caused by the pressing force acting on the wall portion 17a causes the insertion portion 3
For 1b, the cross-sectional area perpendicular to the axis Q1 is elastically reduced, and for the protrusion 20, the inside of the introduction portion 17 is elastically expanded in the direction of arrow C. Act on. Eventually, the cross-sectional area of the insertion portion 31b perpendicular to the axis Q1 is reduced, and the inside of the introduction portion 17 is enlarged in the direction of arrow C, so that the insertion portion 31b pressed in the direction of arrow A is inserted in the introduction portion 17. Move in the direction of arrow A. Further, the piston 23 is pressed in the direction of arrow A, and the insertion portion 31b is further moved in the direction of arrow A at the introduction portion 17, so that the insertion portion 31b is moved from the arrow A side toward the introduction portion 17 and the engagement holding portion 16. The piston 23 is stopped by pressing the piston 23 by moving it to the side of the engagement holding portion 16 so that the boundary portion 19 and the insertion portion 31b are completely inserted into the engagement holding portion 16. When the insertion portion 31b is completely inserted into the engagement holding portion 16, the hub engagement portion 31 and the piston engagement hole 15 are engaged with each other, and the engagement operation between the piston 23 and the hub 9 is completed. Note that the pressing force in the arrow A direction acts on the insertion portion 31b, so that the pressing force in the arrow A direction also acts on the hub 9. However, the hub 9 is supported in the direction of the arrow B by the hand that supports the syringe main body 2 through the hub stop rib 7d of the hub insertion portion 7 and the syringe main body 2, or even if the hub stop rib 7d is not attached. Even if the hub 9 is not supported by the hub fixing member 61, the end surface 10a of the hub 9 is supported by the reaction force wall portion 61d of the hub fixing member 61, and the hub fixing member 61 is inserted through the syringe engaging projection 63.
The syringe body 2 can be supported in the direction of arrow B by a hand that supports the syringe body 2. This is because in the state where the syringe engaging protrusion 63 and the hub fixing member engaging groove 7c are engaged with each other, the side portion 63c and the hub inserting portion 7 are in the hub fixing member engaging groove 7c as described above. At the contact portions of both 63c and 7, these 63c and 7 are indicated by arrows A and B.
Since the forces can be applied to each other only in the direction, the hub fixing member 61 is moved by the hub 9 by the arrow A.
Even if it is pulled in the direction of arrow A with respect to the syringe 100 by receiving the pressing force in the direction, the fixing member main body 61a receives the reaction force from the syringe 100 only in the direction of arrow B through the syringe engaging protrusion 63, and thus the tubular portion. 61e is not expanded in the direction of arrow C, and the engagement between the syringe engaging protrusion 63 and the hub fixing member engaging groove 7c is not disengaged. Therefore, the pressing force of the hub 9 is applied via the hub fixing member 61 100 is completely transmitted. Therefore, the hub 9 hardly moves in the arrow A direction or the like even when receiving the pressing force in the arrow A direction, and the hub 9 does not come out from the hub insertion portion 7 in the arrow A direction.

Next, the piston 23 is pulled with respect to the syringe body 2 in the direction of arrow B with a predetermined pulling force. That is,
An acting force in the arrow B direction due to a predetermined pulling force acts on the piston 23 and the insertion portion 31b of the hub engaging portion 31. By the way, the restoring force of the hub insertion portion 4 in the direction of arrow D is set to a predetermined magnitude as described above, and therefore, the action force in the direction of arrow B due to the predetermined pulling-out force is set to the hub. 9 and the hub insertion portion 7, the seals between the seal portions 7e on the arrow A side and the open end portions 10e on the arrow B side are released, and thus the hub stop rib 7d and the hub stop groove 1 are removed.
0c is disengaged. Further, the hub fixing member 61 and the hub 9 are engaged with each other in such a manner that the engagement holding column portion 11 penetrates the hub fixing member 61, and between the both 11, 11 as described above, in the directions of the arrows C and D. And a predetermined frictional force in the directions A and B between the two 11 and 61 can act on the two 11 and 61 so as to hold the two 11 and 61 therebetween. However, since the predetermined pulling force when pulling out the hub 9 has a magnitude that overcomes the predetermined frictional force, the engagement holding column portion 11 and the hub fixing member 61 are engaged with each other. The portion 11 is detached from the hub fixing member 61 so as to come off. The hub retaining rib 7d and the hub retaining groove 10c are disengaged from each other, and the engagement holding column portion 11 and the hub fixing member 61 are disengaged from each other.
And pull it until the hub 9 completely comes out from the hub insertion hole 7b in the direction of arrow B. At this time, since the clearance space 12 is formed between the hub 9 and the hub insertion hole 7b, the contact between the hub 9 and the hub insertion portion 7 is made only through the hub stop rib 7d. The pulling-out operation can be easily performed with a small force after the engagement between the hub stop rib 7d and the hub stop groove 10c is released.

Further pulling the piston 23, the injection needle 21 fixedly inserted on the arrow A side of the hub 9 is fixed to the hub fixing member 6.
Hub engaging hole 62 and opening end portion 7g of the hub insertion portion 7
Further, it is inserted into the hub insertion hole 7b in the direction of arrow B, further inserted in the direction of arrow B into the internal space 2a of the main cylindrical portion 3, and the tip of the injection needle 21 is completely inserted into the internal space 2a. , Pull the piston 23 in the direction of arrow B. Piston 2
3 is further pulled, and as shown in FIG.
However, the piston 23 is stopped by pulling it to a position where it abuts on the locking rib 3b of the main cylindrical portion 3 of the syringe body 2. Then, the notch 26 of the piston main body 25 becomes the syringe main body 2
Is positioned in the vicinity of the open end 3a. Then, a force in the direction of arrow C is applied to the piston 23. By applying a force in the direction of arrow C to the piston 23 with respect to the syringe body 2, the piston body 25 is bent at the notch 26 formed in the piston body 25, which is structurally weak against bending stress. The body 25 has a notch 26
Is divided into a part on the arrow A side and a part on the arrow B side. Next, the broken portion of the syringe body 2 side and the portion of the outer pressing plate 27 of the piston 23 are discarded. Since the injection needle 21 is completely inserted and stored in the inner space 2a of the syringe body 2 while being retained by the tip of the remaining piston 23, the injection needle 21 injures a hand or the like, There is less risk of secondary infections and therefore safe disposal. As described above, the operation of storing the injection needle is completed, and the use of the syringe 1 and the disposal after use are all completed.

In the embodiment described above, the hub fixing member 61 of the needle base unit 60 is provided with the syringe engaging projection 63 formed in the form of a ridge as a means for fixing the syringe, and the syringe 100 A hub fixing member engaging groove 7c formed in the shape of a groove is formed in the hub insertion portion 7 as a counter force fixing member engaging means. However, the anti-syringe fixing means and the anti-reaction force fixing member engaging means may be formed so that they can be engaged and fixed to each other. For example, the anti-syringe fixing means in the form of a groove, the anti-reaction force fixing member. The engaging means may be respectively formed in the shape of a ridge, and the syringe fixing means and the anti-syringe fixing means may be threadably engaged with each other so that the anti-syringe fixing means and the anti-reaction force fixing member engaging means can be screwed to each other. The force fixing member engaging means may be formed in the form of a screw.

[0024]

As described above, the first aspect of the present invention has a hub body such as a hub body 10 formed in a columnar shape, and an end surface 10a or the like abuts on one end side of the hub body. An end portion is formed, and an engagement holding column portion 11 or the like having an outer diameter such as an outer diameter L2 smaller than an outer diameter such as the outer diameter L1 or L1 ′ of the hub body is formed on the contact end side of the hub body. An engagement holding portion is provided, an injection needle such as an injection needle 21 is connected to the engagement holding portion, and a piston engagement hole 15 is provided on the opposite side of the hub body from the one end side.
And the like, and a pair of syringe engaging means such as a hub stop groove 10c is formed in an annular shape on the outer peripheral surface side such as the outer peripheral surface 10f of the hub body, and the hub engaging portion is engaged with the engagement holding portion. A reaction force fixing member such as a hub fixing member 61 in which a hub engaging hole such as a hole 62 is formed is provided by engaging the engagement holding portion in the hub engaging hole such that the engaging holding portion is insertable and removable. Since the reaction force fixing member is formed by forming a syringe fixing means such as the syringe engaging protrusion 63, when the needle base unit according to the present invention is connected to a syringe for a syringe, the reaction force fixing member of the needle base unit. Is fixed to the syringe via the syringe fixing means, the abutting end side of the hub body can be indirectly supported by the syringe via the reaction force fixing member, thus connecting the needle base unit. On the syringe side, the hub body is attached to the syringe. No means for directly supporting the hub body may be provided so as not to jump out from the tip side of the fringe, and no means for directly supporting the hub body is provided. By using a syringe having no shape, it is easy to insert the hub main body from the tip side of the syringe, because resistance is not applied during insertion. Therefore, when the needle base unit according to the present invention is used, it becomes easy to easily connect and insert the hub body to which the injection needle is connected to the syringe at a treatment site or the like. And a plurality of types of syringes are prepared in an unconnected state, and an appropriate needle base unit and syringe are selected from the plurality of types of needle base units to be used and the plurality of types of syringes according to the application such as treatment. Then, it becomes possible to connect immediately before performing the injection operation,
The versatility of the syringe can be improved. The second invention of the present invention has a syringe body such as a cylindrical syringe body 2, and the opening end 7 is provided on the tip side of the syringe body.
A hub insertion portion such as a hub insertion portion 7 formed in a tubular shape is formed through a hub introduction opening such as g, and a hub fixing member engagement is provided on an outer peripheral surface side such as an outer peripheral surface 7f of the hub insertion portion. Anti-reaction force fixing member engaging means such as a mating groove 7c is formed, and anti-hub engaging means such as a hub stop rib 7d is annularly formed on the inner peripheral surface side such as the inner peripheral surface 7a of the hub insertion portion. Since it is configured, since the reaction force fixing member can be engaged and fixed to the syringe according to the present invention through the counter force fixing member engaging means, when the syringe hub body is attached to the syringe, The hub body can be indirectly supported on the syringe side via the reaction force fixing member so that the hub body does not jump out from the tip side of the syringe. Directly support the hub body so that it does not pop out from the tip side of the syringe. Because of the means it may not have anything provided. That is, it is easy to insert the hub main body from the tip side of the syringe, because resistance is not applied during insertion. Therefore, with the syringe according to the invention,
Since it becomes easy to easily connect and insert the hub body to which the injection needle is connected to the syringe at the treatment site or the like, at the treatment site or the like, a plurality of types of hub bodies connected to the reaction force fixing member are connected to the hub body. An injection needle and the syringe are prepared in an unconnected state, and a plurality of types of injection needles (or a plurality of injection needles for one syringe needle) are prepared for one syringe depending on the application such as treatment. It is possible to select and connect the type of syringe) immediately before performing the injection operation, and it is possible to enhance the versatility of the syringe. In a third aspect of the present invention, in the connection structure between the needle base unit of the first aspect of the invention and the syringe of the second aspect of the invention, the hub main body is placed inside the hub insertion portion, and the hub main body is attached to the hub main body. The contact end side is placed so as to face the syringe main body backward, and the syringe engagement means of the hub body and the hub engagement means of the hub insertion portion are detachably engaged with each other. A reaction force fixing member is provided on the outer peripheral surface side of the hub insertion portion, and the reaction force fixing member engaging means of the hub insertion portion and the syringe fixing means of the reaction force fixing member are engaged with each other. It is easy to connect the needle base unit of the first aspect of the invention and the syringe of the second aspect of the invention at the treatment site or the like in the form of forming the connection structure according to the present invention. Therefore, at the treatment site, etc., multiple types of connected to the hub body engaged with the reaction force fixing member Prepare the firing needle and multiple types of syringes in an unconnected state, and use one injection needle for multiple types of syringes or one syringe for multiple types of syringes, depending on the application such as treatment. A plurality of types of injection needles can be selected and connected immediately before performing the injection operation, and the versatility of the injector can be improved.

[Brief description of drawings]

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a needle base unit according to the present invention,
It is sectional drawing which showed the connection part with an example of the syringe by this invention.

FIG. 2 is a cross-sectional view showing the entire needle base unit shown in FIG. 1 and a syringe to which a syringe is applied.

FIG. 3 is a view showing a state in which a storage cap is attached to the needle base unit shown in FIG.

FIG. 4 is a diagram showing a piston breaking operation in the syringe shown in FIG. 2;

[Explanation of symbols]

2 ... Syringe body 7 ... Hub insertion portion 7a ... Inner peripheral surface 7c ... Counter reaction force fixing member engaging means (hub fixing member engaging groove) 7d ... Against hub engaging means (hub stop rib) 7f ... Outer peripheral surface 7g ... Hub introduction opening (opening end) 10 ... Hub main body 10a ... Abutting end (end surface) 10c ... Syringe engaging means (hub stop groove) 10f. 11 ... Engagement holding part (engagement holding columnar part) 15 ... Piston engagement means (piston engagement hole) 21 ... Injection needle 60 ... Needle base unit 61 ... Reaction force fixing member (hub fixing member) ) 62 ... Hub engaging hole 63 ... Against syringe fixing means (syringe engaging protrusion) 100 ... Syringe L1 ... Outer diameter L1 '... Outer diameter L2 ... Outer diameter

Claims (3)

[Claims] 1. A hub body having a columnar shape, wherein an abutting end portion is formed on one end side of the hub body, and an outer diameter of the abutting end portion side of the hub body is outside the hub body. An engagement holding portion smaller than the diameter is provided, an injection needle is connected to the engagement holding portion, and a pair of piston engagement means is provided on the opposite side of the hub body from the one end side, and an outer peripheral surface side of the hub body is provided. And a reaction force fixing member having a hub engagement hole formed in the engagement holding portion, and the engagement holding portion is removably inserted into the hub engagement hole. A needle base unit that is provided by engaging in a curved shape and is formed by forming a syringe fixing means on the reaction force fixing member. 2. A cylindrical syringe body, wherein a cylindrical hub insertion portion is formed on a distal end side of the syringe body through a hub introduction opening, and an outer periphery of the hub insertion portion. A syringe configured by forming counter reaction force fixing member engaging means on the surface side and forming the anti-hub engaging means annularly on the inner peripheral surface side of the hub insertion portion. 3. The connection structure between the needle base unit according to claim 1 and the syringe according to claim 2, wherein the hub main body is provided inside the hub insertion portion, and the contact end side of the hub main body is the The syringe body is provided so as to face back, and the syringe engagement means for the hub body and the hub engagement means for the hub insertion portion are detachably engaged with each other. A reaction force fixing member is provided on the outer peripheral surface side of the insertion portion by mounting the reaction force fixing member engaging means of the hub insertion portion and the syringe fixing means of the reaction force fixing member to each other. The structure for connecting the needle base unit and syringe configured as above.