JP5695485B2 - Syringe - Google Patents

Description

  The present invention relates to a syringe, and in particular, intends to discharge a small amount of contents quantitatively.

  A syringe used in the medical field is generally provided with a scale on the surface of a syringe (cylinder) like the syringe described in Patent Document 1, for example, and the syringe is sandwiched between the index finger and the middle finger, for example. In a state where it is supported, the plunger is pushed in with the thumb while looking at the scale, whereby a predetermined amount of contents (medical solution) is administered to the patient.

JP 2002-306594 A

  By the way, although the conventional syringe as described in the above-mentioned Patent Document 1 has a scale, it is necessary to adjust the pushing amount of the plunger by adjusting the pressure of the finger, and there is some variation. Can not escape. In particular, when the required amount is small, the amount of variation allowed for discharging the contents becomes more severe, and the operation becomes very difficult. In addition, it has been studied to fill a syringe with a predetermined amount of contents in advance and then discharge all of the contents. However, the air that enters the syringe needle when it is attached to the syringe or the air that originally exists in the syringe needle In order to reliably discharge the contents, it is inevitable to discharge a part of the contents together with the air, and it is still difficult to discharge the contents in the expected amount. For this reason, the appearance of a new syringe that can be discharged with a simple operation even with a small amount of contents has been strongly desired.

  An object of the present invention is to propose an easy-to-use syringe that can discharge a small amount of contents quantitatively and can be realized with a simple configuration.

The present invention relates to a syringe having a tip cylinder for mounting an injection needle, a piston that is slidably disposed in the syringe and forms a filling space for contents inside the syringe, and is connected to the piston. And a plunger for discharging the contents in the filling space from the tip of the injection needle by a slide accompanying the addition of a pushing force,
The piston has a central opening penetrating in the axial direction toward the filling space;
The plunger includes an inner space connected to the central opening, and the inner space is provided with a rod that is slidably held in the central opening and is concentrically arranged with the plunger.
When pushing the plunger, which discharges residual air in the injection needle together with a part of the contents, to the rear end of the plunger, the pushing is performed by contact with a finger hook provided on the rear end of the syringe. Form a plunger stopper to stop,
The rod has a tip portion that protrudes into the filling space when the rod is pushed, and the tip portion is stopped at a predetermined protrusion amount by contacting the rod with the plunger. A syringe is provided with a rod stopper for stopping the discharge of the contents related to the protrusion of the portion by a predetermined amount.

  The plunger preferably includes a detachable cover that contacts the rear end of the rod and slides the rod when the plunger is pushed.

  The cover is preferably connected to the plunger stopper via a hinge.

  It is desirable that the syringe includes a distal end cover that is attached to the distal end cylindrical body when the injection needle is not attached.

  It is desirable that the plunger includes a detachable push-in preventing member that prevents the plunger from being pushed between a finger hooking portion of the syringe and the plunger stopper.

  A rod that is slidably held in the central hole provided in the piston, and is arranged inside the plunger to be concentric with the plunger. Further, the plunger stopper abuts against the finger-holding part of the syringe. This allows the remaining air in the injection needle to be discharged together with a part of the contents while the remaining contents remain in the filling space to stop the pushing, and in addition, the tip of the rod relating to the pushing of the rod is filled. While the contents are ejected from the injection needle by protruding into the space, the rod stopper comes into contact with the plunger and the tip is stopped at the specified amount of protrusion, so the desired amount can be accurately measured even with a small amount of contents. Can be discharged. In addition, the operation related to the discharge is easy to use because the plunger and the rod need only be pushed in until the respective stoppers come into contact with each other.

  If the plunger is provided with a detachable cover that contacts the rear end of the rod and slides the rod as the plunger is pushed in, the rod will be inadvertently displaced because it will not touch the rod. In addition, since the rod slides without being displaced while the plunger is pushed in, the amount of contents does not change from the expected amount.

  When the cover and the plunger stopper are connected via a hinge, not only the number of parts can be reduced, but also the cover can be opened with one hand, so that the usability can be improved.

  When providing a tip cover to be attached to the tip cylinder of the syringe, the inside of the syringe can be sealed until immediately before the injection needle is attached. Alteration and the like can be effectively prevented.

  In the case where a detachable push-in preventing member is provided between the finger-holding portion of the syringe and the plunger stopper, for example, inadvertent push-in of the plunger in transportation or the like can be effectively prevented.

It is sectional drawing in alignment with the axis line of the syringe of a syringe non-wearing posture about embodiment of the syringe according to this invention. It is a top view of the syringe shown in FIG. It is a bottom view of the syringe shown in FIG. FIG. 1A is a plan view and FIG. 2B is a side view showing a push-in preventing member of the syringe shown in FIG. 1. FIG. 2 is a cross-sectional view of the syringe shown in FIG. 1 in a non-wearing posture and a syringe needle attached to the syringe. FIG. 6 is a cross-sectional view of the syringe with the injection needle mounting posture, to which the injection needle shown in FIG. 5 is mounted. FIG. 7 is a cross-sectional view of the syringe in a plunger push-in completion posture in which the plunger of the syringe shown in FIG. 6 is pushed in until the plunger stopper comes into contact with the finger hook portion of the syringe. It is sectional drawing of the syringe of the cover removal attitude | position which opened the cover of the syringe shown in FIG. It is sectional drawing of the syringe of the rod pushing completion posture which pushed the rod of the syringe shown in FIG. 8 until the rod stopper contact | abutted with the plunger.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a cross-sectional view taken along the axis of a syringe in a non-injection posture according to an embodiment of the syringe according to the present invention, FIG. 2 is a plan view of the syringe shown in FIG. 1, and FIG. 4 is a bottom view of the syringe shown in FIG. 1, FIG. 4 shows a push-in preventing member of the syringe shown in FIG. 1, (a) is a plan view, (b) is a side view, and FIG. FIG. 6 is a cross-sectional view of a syringe in a non-injection posture shown in FIG. 5 and a syringe needle to be attached to this syringe, and FIG. 6 is a cross-sectional view of a syringe in the injection needle attachment posture with the injection needle shown in FIG. FIG. 7 is a cross-sectional view of the syringe in a plunger push-in completion posture, in which the plunger of the syringe shown in FIG. Disconnecting the syringe with the cover removed and the cover removed A diagram, Figure 9, a syringe rod shown in FIG. 8, is pushed until the rod stopper abuts against the plunger, is a cross-sectional view of the syringe of the rod pushing completion position.

1 and 2, 1 is a syringe. Syringe 1, the intermediate comprising a tip tube body 1a having an outer diameter gradually increasing toward the base having a front end opening 1a _1, the larger diameter than the distal cylinder 1a integrally connected via an inclined portion tip tube body 1a A cylindrical body 1b, a syringe body 1d that is integrally connected via the intermediate cylinder 1b and the stepped portion 1c and has a larger diameter than the intermediate cylinder 1b, and a circle that extends radially outward from the rear end of the syringe body 1d It consists of a flange (finger part) 1e having a shape. The inner surface of the intermediate cylinder 1 b is substantially parallel along the axis of the syringe 1. An inclined portion 1c _{1 that} is inclined from the front end side toward the rear end side is provided on the inner surface of the step portion 1c.

A piston 2 is slidably disposed in the syringe 1. The piston 2 is formed of a soft material (rubber or the like), and the contents filled inside the syringe 1 are liquid-tightly sealed together with a rod described later to form a filling space M for the contents. Note the filling space M here means the area inside the syringe 1 extending from the distal end opening 1a ₁ of the tip tube body 1a in front end wall 2a ₁ of the piston 2. Further, a tip cover, which will be described later, is attached to the tip cylindrical body 1a, and the filling space M is filled with contents in advance.

The piston 2 has a distal end portion 2a having a distal end wall 2a ₁ and having an outer diameter substantially the same as or slightly larger than the inner diameter of the intermediate cylinder 1b, and an inclined portion 2b inclined from the distal end side toward the rear end side. A base portion 2c that is integrally connected to the distal end portion 2a, and a central opening 2d that penetrates the distal end portion 2a and the base portion 2c along the axis are provided. Central aperture 2d is distal inner surface wall 2d ₁ located at the top side substantially parallel along the axis, at the rear end side through the inclined wall 2d ₂ inclined toward the rear side from the front end side The rear end inner wall 2d ₃ is connected. Further, the base portion 2c, the concave coupling portion 2c ₁ which connects the later-described plunger is provided.

Reference numeral 3 denotes a plunger connected to the piston 2. The plunger 3 includes a plunger body 3a extending along the axis. The distal end side of the plunger body 3a is convex engaging portion 3a ₁ integrally connected to the concave coupling portion 2c ₁ is formed. The inside of the plunger main body 3a extend through along the axis, thereby forming an inner space 3a _2. In the inner space 3a ₂ , the tip inner wall 3a ₃ located on the tip side has the same inner diameter as the rear end inner wall 2d ₃ of the piston 2, and the inclined wall 3a ₄ inclined from the tip side toward the rear end side is provided. And is connected to the rear end inner wall 3a ₅ located on the rear end side. A plurality of ribs 3a ₆ extending along the axis and having substantially the same outer diameter as the base 2c are provided on the outer side of the plunger body 3a at intervals in the circumferential direction. The plunger 3 includes an annular body 3b that is integrally connected to the rear end portion of the plunger body 3a, and a flange (plunger stopper) 3c that extends radially outward from the rear end portion of the annular body 3b. . The flange 3c includes an annular wall 3c ₁ to a smaller diameter than the flange 3c protruding toward the rear end. The outer edge of the rear end of the annular wall 3c ₁ is inclined portion 3c ₂ is formed.

Moreover, it is preferable to arrange a cover 3d behind the plunger stopper 3c. The cover 3d is detachably attached to the plunger stopper 3c (for example, a screw connection or a connection by elastically moving claws). In the illustrated example, the plunger stopper 3c and the cover 3d are coupled via a hinge h. Cover 3d, the central wall portion with integrally connecting (plunger operating portion) wall 3d ₂ of the edge ring of 3d _1, the inside of the peripheral wall 3d _2, the ribs 3d of the height is lower than the peripheral wall 3d _{2 A} plurality of ₃ are provided at intervals in the circumferential direction. The outside of the peripheral wall 3d ₂ is integrally connected to the convex portion 3d ₄ at a position facing the hinge h. The peripheral wall 3d ₂ inner diameter substantially the same as the outer diameter of the annular wall 3c _1, or because it is slightly smaller, in the cover 3d is closed resulting position shown in FIG. 1 (cover mounting posture), the cover 3d is The annular wall 3c ₁ is held by fitting.

Reference numeral 4 denotes a rod that is arranged in the inner space 3 a ₂ of the plunger 3 and has a double concentric arrangement with the plunger 3. Rod 4, a central opening 2d of the piston 2, the tip in particular to be substantially the same, or has an outer diameter slightly larger, slidably held on the tip inner surface wall 2d ₁ and the tip inner surface wall 2d ₁ of the inner diameter An intermediate part 4a, an intermediate part 4c integrally connected to the front end part 4a via an inclined part 4b inclined from the front end side toward the rear end side, and an intermediate part via an inclined part 4d inclined from the front end side toward the rear end side 4c and a rod body 4e integrally connected to 4c. Also, there is substantially on the same plane with the front end wall 2a ₁ of the front wall 4a ₁ and the piston 2 of the tip portion 4a. Moreover, the hole part 4f as a stealing is formed in the inner side from the intermediate part 4c to the rod main-body part 4e, and the thickness of those parts is substantially the same. Further, a flange (rod operating portion) 4g extending radially outward is provided at the rear end portion of the rod body portion 4e, and an annular portion 4h toward the tip end side is formed at the edge of the rod operating portion 4g. Yes. Here the rod operating unit 4g, when providing the cover 3d, it is preferable to contact a central wall portion 3d ₁ of the inner surface of the cover 3d as shown in FIG. The end portion of the distal end side of the annular portion 4h has a rod stopper 4h _1. As will be described later, the rod stopper 4h ₁ abuts against the plunger 3 when the rod 4 is pushed in to stop the pushing, and the shape thereof is only at the end of the annular portion 4h on the tip side. For example, the surface of the rod operating portion 4g may be brought into direct contact with the plunger stopper 3c without providing the annular portion 4h.

  Reference numeral 5 denotes a push-in preventing member that is disposed between the finger-hanging portion 1e of the syringe 1 and the plunger stopper 3c and prevents the plunger 3 from being pushed in. As shown in FIG. 4, the push-in preventing member 5 includes a C-shaped coupling portion 5 a that is cut out of an annular portion, and a connection that is integrally connected on the opposite side of the notch portion of the coupling portion 5 a and extends radially outward. It consists of a part 5b and a grip part 5c that extends in both directions in a direction substantially orthogonal to the direction in which the connection part 5b extends and is T-shaped between the connection part 5b. As shown in FIGS. 1 and 3, the push-in preventing member 5 is locked by fitting the coupling portion 5a into the annular body 3b of the plunger 3 while grasping and pulling the gripping portion 5c. Can be removed.

  Reference numeral 6 denotes a distal end cover that is mounted on the distal end cylindrical body 1a of the syringe 1 in an unmounted posture of an injection needle, which will be described later. The front end cover 6 includes a circular wall 6a and an annular peripheral wall 6b integrally connected to the edge of the circular wall 6a. The peripheral wall 6b is fitted into the front end cylindrical body 1a so as to liquid-tightly seal the filling space M. Can be stopped. The front end cover 6 may be attached to the front end cylindrical body 1a by screwing.

  In FIG. 5, reference numeral 7 denotes an injection needle attached to the distal end cylindrical body 1 a of the syringe 1 after removing the distal end cover 6. The injection needle 7 is stored in a protective case C or the like when not in use, for example. Various types of injection needles 7 can be used. In the illustrated example, the needle portion 7b is attached to the base portion 7a, and the base portion 7a is pushed into the distal end cylindrical body 1a so as to be attached to the syringe 1. Installation is now complete. In addition, you may make it mount by providing a screw part in the base part 7a and the front-end | tip cylinder 1a, and screwing together.

In the syringe configured as described above, when the piston 2 is attached to the syringe 1, the outer diameter of the tip 2 a of the piston 2 is substantially the same as or slightly larger than the inner diameter of the intermediate cylinder 1 b of the syringe 1. but the tip portion 2a, since it is inserted guided by the inclined portion 1c ₁ of the syringe 1 in the intermediate cylindrical body 1b, never assembly workability is impaired. The outer diameter of the distal end portion 4a of the rod 4 is substantially identical to the distal inner surface wall 2d ₁ having an inner diameter of the piston 2, or is slightly larger, but the tip portion 4a is guided by the inclined wall 2d ₂ of the piston 2 Since it is inserted into the tip inner wall 2d ₁ , the assembly workability is not impaired as with the syringe 1 and piston 2 described above.

  When discharging the contents with the above-described syringe, the tip cover 6 is removed from the syringe in a non-injection needle mounting position shown in FIG. 5, and the injection needle 7 is mounted as shown in FIG. Note that when the injection needle 7 is mounted, air may enter the filling space M, and air is originally left in the injection needle 7. It is discharged at. Further, the push-in preventing member 5 shown in FIG. 5 is also removed.

Next, as shown in FIG. 7, with the posture in which the injection needle 7 is directed upward, the plunger operating portion 3d ₁ is pressed in the direction of the arrow, and the plunger 3 is slid along the axis along with the rod 4, and the plan The pressing is continued until the jar stopper 3c comes into contact with the finger hooking portion 1e of the syringe 1. As a result, the piston 2 is pushed toward the distal end cylindrical body 1 a of the syringe 1, so that the air in the filling space M and the injection needle 7 together with the contents is discharged from the distal end of the injection needle 7. Here, only a part of the contents to be discharged is present, and the contents remain in the filling space M. Incidentally, it rod 4 and the piston 2 Indian meal white (white tightening the tip portion 4a and the distal inner surface wall 2d ₁₎ is white tightening the piston 2 and the syringe 1 Indian meal white (tip part 2a and the intermediate cylinder 1b ), The cover 3d can be slid with the rod 4 even if it is pressed near the plunger stopper 3c of the plunger 3 with the cover 3d opened. If it closes and the plunger 3 is pressed, the rod 4 will not be pushed carelessly.

Thereafter, as shown in FIG. 8, the rod 4 can be pressed by opening the cover 3d. Since the cover 3d in the illustrated example is connected to the plunger stopper 3c at the hinge h, it is possible to open the cover 3d by one touch by pushing up over the fingers on the convex portion 3d _4.

Then, as shown in FIG. 9, the rod operating portion 4 g is pressed, and the tip portion 4 a of the rod 4 is protruded into the filling space M. And Continuing the push rod operating portion 4g, the rod stopper 4h ₁ abuts against the plunger stopper 3c, protrusion of the distal end portion 4a is stopped. Here, since the inside of the filling space M and the injection needle 7 is filled with the contents before the rod 4 is pushed in, the distal end portion 4a slides into the filling space M from the start of pushing the rod 4 until it stops. The content corresponding to the volume of the volume is discharged from the tip of the injection needle 7. Thereby, even if it is a small amount of contents, a predetermined amount can be discharged accurately.

  ADVANTAGE OF THE INVENTION According to this invention, a small amount of contents can be discharged | emitted by fixed_quantity | quantitative_quantity, Furthermore, the easy-to-use syringe which can be implement | achieved by simple structure can be provided.

DESCRIPTION OF SYMBOLS 1 Syringe 1a Tip cylinder 1b Intermediate cylinder 1c Step part 1d Syringe body 1e Flange (finger part)
2 Piston 2a Tip part 2b Inclined part 2c Base part 2d Central opening 3 Plunger 3a Plunger main body 3a ₂ Inner space 3b Annulus 3c Flange (plunger stopper)
3d cover 3d ₁ central wall (plunger operation part)
3d ₂ peripheral wall 3d ₃ rib 3d ₄ convex part 4 rod 4a tip part 4b inclined part 4c intermediate part 4d inclined part 4e rod body part 4f hole part 4g flange (rod operating part)
4h annular portion 4h ₁ rod stopper 5 push-in preventing member 5a coupling portion 5b connection portion 5c gripping portion 6 tip cover 6a circular wall 6b peripheral wall 7 injection needle 7a base portion 7b needle portion M filling space

Claims (5)

A syringe having a tip cylinder for mounting an injection needle, a piston slidably disposed in the syringe and forming a filling space for contents inside the syringe, and coupled to the piston and pushing force A plunger for discharging the contents in the filling space from the tip of the injection needle by a slide accompanying the addition of
The piston has a central opening penetrating in the axial direction toward the filling space;
The plunger includes an inner space connected to the central opening, and the inner space is provided with a rod that is slidably held in the central opening and is concentrically arranged with the plunger.
When pushing the plunger, which discharges residual air in the injection needle together with a part of the contents, to the rear end of the plunger, the pushing is performed by contact with a finger hook provided on the rear end of the syringe. Form a plunger stopper to stop,
The rod has a tip portion that protrudes into the filling space when the rod is pushed, and the tip portion is stopped at a predetermined protrusion amount by contacting the rod with the plunger. A syringe provided with a rod stopper for stopping the discharge of the contents related to the protrusion of the portion by a predetermined amount.   The syringe according to claim 1, wherein the plunger includes a detachable cover that abuts on a rear end portion of the rod and slides the rod as the plunger is pushed.   The syringe according to claim 2, wherein the cover is connected to the plunger stopper via a hinge.   The syringe according to any one of claims 1 to 3, wherein the syringe includes a distal end cover attached to the distal end cylindrical body when the injection needle is not attached.   The syringe according to any one of claims 1 to 4, wherein the plunger includes a detachable push-in preventing member that prevents the plunger from being pushed between a finger hooking portion of the syringe and the plunger stopper.

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