JP5749084B2 - Single-use syringe - Google Patents

Description

  The present invention relates to a syringe intended to be used up.

  The syringe includes a syringe and a piston member that is slidably held in the through-hole of the syringe, and an internal solution is filled in a space formed between the syringe and the piston member by a pulling operation of the piston member. On the other hand, it is general that the inner solution can be poured out by the pushing operation (see, for example, Patent Document 1).

JP 7-213612 A

  Since such a syringe can always move freely with respect to a syringe, even if it is used once, it can be reused by performing sterilization and disinfection processing.

  However, depending on the application, it may be better to discard it without using it up and reusing it.

  An object of the present invention is to provide a novel syringe intended to be used up easily without requiring a complicated operation.

The present invention includes a syringe, a piston slidably held in a through hole of the syringe, and a plunger that pulls out and pushes the piston, and is formed between the syringe and the piston by pulling out the plunger. A syringe capable of filling the inner space with the inner solution and discharging the inner solution by pushing the inner space;
A sleeve member that has a passage for penetrating the plunger and can be disposed in the through hole of the syringe is provided, and a protrusion provided on the plunger is fitted to the inner peripheral surface of the sleeve member from the inside so that the plunger is located with respect to the sleeve member. A groove portion or a long hole portion that is guided so as to be able to be pulled out, and a step portion that holds the plunger fixed to the sleeve member by being caught by the protruding portion that has overcome the groove portion or the long hole portion by pulling out the plunger for filling the inner solution. On the other hand, a protrusion provided on the sleeve member is joined to the inner peripheral surface of the syringe from the inside to prevent the sleeve member from being pulled out of the syringe, and the sleeve member is guided to be extrudable with respect to the syringe. and the hole or the groove, the inner solution multiply the long hole portion or a groove portion by pushing the plunger to dispense the It is characterized in that the sleeve member wherein the projection is caught is provided a stepped portion for fixing and holding against the syringe beyond.

  In the present invention, it is preferable to provide an inclined surface in which the protrusion provided on the plunger can be overcome in a groove or a long hole provided on the inner peripheral surface of the sleeve member.

  In the present invention, it is preferable to provide a slant surface on which the protrusion can get over the elongated hole or groove provided on the inner peripheral surface of the syringe and the protrusion provided on the sleeve member.

  In the present invention, the groove portions or long hole portions and step portions provided on the inner peripheral surface of the sleeve member and the protrusion portions provided on the outer peripheral surface of the sleeve member are alternately arranged in the circumferential direction, and the mutual It is preferable to provide the notch part which divides | segments toward the pushing direction from the rear end of a sleeve member.

  In the present invention, the piston can be pulled out along the groove portion or the long hole portion provided in the sleeve member, and the protruding portion provided in the plunger is hooked on the step portion provided in the sleeve member and fixedly held. Will be possible. Thereby, the suction | inhalation of an internal solution can always be performed with a fixed stroke amount.

  In addition, when dispensing the content liquid, the plunger can be pushed along with the sleeve member along the slot or groove provided in the syringe, and the pushing is performed by the step provided on the syringe by the protrusion provided on the sleeve member. It becomes possible until it is hooked on and fixedly held. As a result, the inner solution can be completely poured out, and after the pouring is completed, the plunger is fixedly held by the syringe via the sleeve member, and therefore the plunger cannot be pulled back.

  As described above, according to the present invention, the plunger can be fixed to the syringe only by performing the drawing required for suction and the pushing required for pouring. Therefore, according to the present invention, it is possible to provide a novel syringe that is intended to be used up easily without requiring a complicated operation.

It is a form of a cartridge-type syringe according to the present invention, wherein (a) is a partial cross-sectional view showing a state before use from one side, and (b) is a view showing another state before use. It is a partial sectional view shown from the side. (a) is a partial cross-sectional view showing the state after suction of the same form from one side, and (b) is a partial cross-sectional view showing the state from the other side. (a) is a partial cross-sectional view showing the state after dispensing of the same form from one side surface, and (b) is a partial cross-sectional view showing the state from the other side surface. It is a perspective view of the sleeve member based on the form. The sleeve member, (a) is a plan view shown from above, (b) is a partial cross-sectional view shown from the side, and (c) is a bottom view shown from below. The sleeve member, (a) is a plan view shown from above, (b) is a partial cross-sectional view shown from the side, and (c) is a bottom view shown from below.

  Hereinafter, an embodiment of a single-use syringe according to the present invention will be described in detail with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes a single-use syringe which is the first embodiment of the present invention, and reference numeral 2 denotes a synthetic resin syringe filled with the content liquid. The syringe 2 has a tip portion 2a having a small outer diameter, a neck portion 2b having a larger outer diameter than the tip portion 2a, and a body portion 2c having a larger outer diameter than the neck portion 2b, and an outer peripheral surface of the body portion 2c. The finger-hanging part 2d is integrally provided. In addition, a cylindrical body portion 2f that surrounds the distal end portion 2a via the annular wall 2e is integrally provided at the distal end portion 2a.

Further, the syringe 2, on its inside, the through-hole 3 to let through an opening A ₂ which is formed in the opening A ₁ and the rear end 2e ₂ formed on the distal end 2e ₁ is formed. The through-hole 3 has a small diameter hole 3a surrounded by the tip 2a, a medium diameter hole 3b surrounded by the neck 2b, and a large diameter hole 3c surrounded by the body 2c.

  Reference numeral 4 denotes a synthetic resin piston that pumps the content liquid of the syringe 2. The piston 4 is a rod-like member and is slidably held in the small diameter hole 3a. Thereby, as shown in FIG. 2, the piston 4 can fill the space R formed between the front end portion 2a of the syringe 2 with the content liquid from the outside.

Reference numeral 5 denotes a plunger provided integrally with the lower end of the piston 4. The plunger 5 has a guide portion 5 a that guides the piston 4. The guide portion 5 a is integrally provided at the lower end of the piston 4. The guide portion 5a is formed of a shaft portion having a cross-sectional shape including four thin plate-like members 5a ₁ surrounding the piston 4, and two projecting portions 5p are integrally provided. The protrusion 5p is provided on the plate-like member 5a ₁ facing each other across the axis O.

The guide portion 5a has its lower end is exposed from the opening A ₂ through the large diameter hole 3c. A rear end portion 5b of the plunger 5 is integrally provided at the lower end of the guide portion 5a. The rear end 5b is shaped as a flange. Thereby, the rear end 5c of the rear end portion 5b functions as a pressing portion for pushing in the piston 4, while the front end 4a of the piston 4 functions as a pressurizing surface for pumping the content liquid.

  Reference numeral 6 denotes a needle part made of synthetic resin that can be attached to the distal end portion 2 a of the syringe 2. The needle part 6 includes a needle 7 and a needle holder 8. The needle holder 8 has an opening at its lower end, and is formed with a recess 8n that communicates with the outside through this opening. Thereby, the needle holder 8 can be fitted and held on the distal end portion 2 a of the syringe 2.

  Furthermore, the needle holder 8 is provided with a flange portion 8s that is screwed into a screw portion 2s formed inside the cylindrical body portion 2f of the syringe 2. The flange portion 8s functions as a screw portion. Thereby, the needle part 6 can be attached to the syringe 2 as shown in the figure by screwing the needle holder 8 into the cylindrical portion 2f.

Reference numeral 10 denotes a synthetic resin sleeve member disposed between the syringe 2 and the plunger 5 as shown in FIG. The inner diameter of the sleeve member 10 has a shape that forms a passage A ₃ that penetrates the guide portion 5 a, and the outer diameter also has a shape that allows the sleeve member 10 to be disposed in the through hole 3 of the syringe 2.

Further, as shown in FIG. 4, a groove portion 10 c extending along the axis O from the upper end 10 a is provided on the inner peripheral surface 10 f ₁ of the sleeve member 10. The groove part 10c is arrange | positioned in the position which opposes on both sides of the axis line O, as shown to Fig.5 (a) and Fig.6 (a). As shown in FIG. 1A and the like, the groove portion 10c guides the plunger 5 to the sleeve member 10 so that the projection 5p provided on the plunger 5 is joined from the inner side. Further, the groove 10c is provided at its abutting side, it has an inclined surface 10d connected to the inner peripheral surface 10f ₁ toward the rear end 10b. Thereby, the protrusion part 5p can get over the groove part 10c along the slope 10d.

In addition, on the inner peripheral surface 10f ₁ of the sleeve member 10, as shown in FIG. 2 (a), a protrusion 5p that gets over the groove 10c is caught at a position aligned with the groove 10c along the axis O. A step portion 10 s is provided to fix and hold 5 to the sleeve member 10. The step portion 10 s is formed by a through hole A ₄ that passes through the sleeve member 10.

In addition, as shown in FIG. 4, two protrusions 10 p are integrally provided on the outer peripheral surface 10 f ₂ of the sleeve member 10. As shown in FIGS. 5A and 6A, the protruding portion 10p is disposed at a position facing the axis O. As shown in FIGS. 5B and 6B, the protrusions 10p are alternately shifted in the circumferential direction with respect to the grooves 10c (inclined portions 10d) and the step portions 10s (for example, in this embodiment) Then 90 degrees).

In contrast, the syringe 2 (the large-diameter portion 2c), long holes A ₅ extending along the axis O are provided. As shown in FIG. 1 (b) and the like, the long hole portion A ₅ guides the sleeve member 10 so that the sleeve member 10 can be advanced and retracted with respect to the syringe 2 by combining the protruding portion 10 p from the inside of the syringe 2.

Further, as shown in FIG. 1B, the rear end edge 21 of the long hole portion A ₅ prevents the sleeve member 10 from being pulled out of the syringe 2 by contacting the protruding portion 10 p. Thereby, even if it is going to pull out using the plunger 5, the sleeve member 10 is retained with respect to the syringe 2.

On the other hand, the tip edge 22 of the long hole portion A ₅ is a slope connected to the inner peripheral surface 2c ₁ toward the tip 2a on the inner peripheral surface 2c ₁ side of the large diameter portion 2c, as shown in FIG. 23. In addition, the protrusion 10p also has a slope 11 that decreases in diameter toward the tip 10a. Thus, projections 10p can be overcome along the long holes A ₅ the slopes 11 and 23.

In addition, the syringe 2 (the large-diameter portion 2c), in a position aligned with the long hole portion A ₅ along the axis O, as shown in FIG. 3 (b), protrusions over the long holes A ₅ A step portion 24 is provided that 10p is hooked and the sleeve member 10 is fixedly held to the syringe 2. The step portion 24 is formed by a through hole A ₆ that penetrates the syringe 2.

  Next, the operation of the single-use syringe according to this embodiment will be described.

  In this embodiment, the user attaches the needle 7 to the syringe 2 by screwing the needle part 6 into the cylindrical body portion 2f.

  Next, when the content liquid is aspirated from the outside, for example, the content liquid filled in the ampule is aspirated, the following operation is performed.

First, the user pulls out the plunger 5 from the rear end opening A ₂ of the syringe 2 from the state shown in FIG. In this case, the sleeve member 10, as shown in FIG. 1 (b) and 2 (b), since the projecting portion 10p is retaining held by the rear edge 21 of the elongated hole portion A _5, the syringe 2 On the other hand, only the plunger 5 can be pulled out along the groove 10c as shown in FIG. 1 (a) to FIG. 2 (a).

  Therefore, from the state shown in FIG. 1, if the needle 7 is inserted into an ampoule or the like filled with the content liquid and the plunger 5 is pulled out, the piston 4 is also pulled out along the groove portion 10c, so that the filling space R is negatively charged. Since the pressure is generated, the content liquid can be sucked into the filling space R by the negative pressure as shown in FIG.

  The plunger 5 can be pulled out until the protruding portion 5p gets over the groove portion 10c from the inclined surface 10d and is caught by the step portion 10s as shown in FIG. 2 (a). Thereby, the suction | inhalation of an internal solution can always be performed with a fixed stroke amount.

  When the protruding portion 5p of the plunger 5 is hooked on the step portion 10s of the sleeve member 10 and fixedly held, the plunger 5 and the sleeve member 10 are integrated as shown in FIG.

For this reason, at the stage of actual injection, the user pushes the plunger 5 in this state. At this time, since the plunger 5 is integrated with the sleeve member 10, if the plunger 5 is pushed, the piston 4 is pushed together with the sleeve member 10 along the long hole portion A ₅ , thereby passing through the needle 7 in the filling space R. Can be poured out to the outside world.

Pushing the plunger 5 until the protrusion 10p of the sleeve member 10 rides over the long holes A ₅ from the inclined surface 23, as shown in FIG. 3 (b), is fixed and held caught by the stepped portion 24 of the syringe 2 It becomes possible. As a result, the inner solution can be completely dispensed, and after the completion of the dispensing, the plunger 5 is fixedly held by the syringe 2 via the sleeve member 10, and therefore the plunger 5 cannot be pulled back.

  That is, in this embodiment, the suction of the content liquid can be performed by pulling out the plunger 5 along the groove portion 10 c provided in the sleeve member 10, and the protrusion 5 p provided in the plunger 5 is provided in the sleeve member 10. This is possible until it is caught by the step 10s and fixed. Thereby, the suction | inhalation of an internal solution can always be performed with a fixed stroke amount.

Further, when the content liquid is poured out, the plunger 5 can be pushed together with the sleeve member 10 along the long hole portion A ₅ provided in the syringe 2, and the pushing is performed by the protruding portion 10 p provided on the sleeve member 10. This is possible until it is caught by the stepped portion 24 provided in the syringe 2 and is fixedly held. As a result, the internal solution filled in the space R can be completely dispensed, and after the completion of the dispensing, the plunger 5 is fixedly held by the syringe 2 via the sleeve member 10, so the plunger 5 is pulled back. I can't.

  As described above, in the present embodiment, the plunger 5 can be fixed to the syringe 2 only by performing the drawing required for suction and the pushing required for dispensing. Therefore, according to the present embodiment, it is possible to provide a novel syringe 1 that is intended to be used up easily without requiring a complicated operation.

In this embodiment, by pulling out the plunger 5, the protrusion 5 p gets over the groove 10 c, and then is hooked and held by the step 10 s, or by pushing in the plunger 5, the protrusion 10 p is long. after passing over the holes a _5, by being fitted and held caught by the stepped portion 24, you can experience to the user the impact and sound as click feeling.

Also, as in the present embodiment, the groove 10c provided on the inner peripheral surface 10f ₁ of the sleeve member 10, by providing the protrusion 5p is overcome possible slopes 10d provided in the plunger 5, the drawer of the plunger 5 is facilitated Thus, the syringe 1 can be used up more easily.

Similarly, if the long hole portion A ₅ provided on the inner peripheral surface 2c ₁ of the syringe 2 and the projection portion 10p provided on the sleeve member 10 are provided with slopes 23 and 11 on which the projection portion 10p can get over, Since the pushing of the plunger 5 becomes easy, the syringe 1 can be used up by an easier operation.

  After use, the needle part 6 can be removed from the syringe 2 by turning the needle part 6 around the axis O and loosening the screw. Thereby, the needle part 6 can be separated and discarded. When discarding the syringe 2, the piston 4, and the plunger 5, an overcap (not shown) is attached to the cylindrical body portion 2 f. Thereby, the syringe 1 from which the needle part 6 has been removed can be safely and hygienically discarded. Further, the needle part 6 can be disposed of safely and hygienically by attaching an overcap to the needle holder 8 as in the conventional case.

The syringe 2, the piston 4 and the plunger 5 are assembled to the plunger 5 through the passage A _{3 of the} sleeve member 10, and then the plunger 5 having the sleeve member 10 is inserted from the opening A ₂ of the rear end 2 e ₂ of the syringe 2. It can be easily assembled by simply inserting it.

In this embodiment, the sleeve member 10, and the inner peripheral surface 10f groove 10c and stepped portion 10s formed in _1, and a protruding portion 10p provided on the outer peripheral surface 10f _2, as shown in FIGS. 5 and 6, In addition to being arranged alternately in the circumferential direction, notches 12 that divide each other are provided from the rear end 10b of the sleeve member 10 in the pushing direction. In this case, when the plunger 5 is inserted into the sleeve member 10, the portion including the protruding portion 5 p is elastically deformed to obstruct the pushing of the plunger 5 because the notches 12 are formed as elastic pieces. The groove 10c of the sleeve member 10 can be matched. For this reason, the assembly operation | work with the plunger 5 and the sleeve member 10 can be performed easily.

Further, when the sleeve member 10 equipped with the plunger 5 is inserted into the syringe 2, the portion including the protrusion 10 p is elastically deformed, and the oblong portion A _{5 of the} syringe 2 is prevented from obstructing the pushing of the sleeve member 10. Since it is caught by the rear end edge 21, the plunger 5 can be held out together with the sleeve member 10. For this reason, the assembly operation | work with the syringe 2 and the plunger 5 provided with the sleeve member 10 can also be performed easily.

The above description only shows one embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, the groove 10c of the sleeve member 10 can be replaced with a long hole. On the contrary, the long hole portion A ₅ of the syringe 2 can be replaced with a groove portion. Further, the step portions 10s and 21 are not limited to those formed by the openings, but may be formed by grooves (concave portions). That is, according to the present invention, the components of each form can be transferred between the forms. Furthermore, instead of the needle 7, the needle part 6 can employ a pipe or a nozzle.

  The present invention includes a syringe, a piston that is slidably held in a through-hole of the syringe, and a plunger that pulls out and pushes the piston, and between the syringe and the piston by a pulling operation of the plunger. Any syringe can be used as long as it fills the formed space with the internal solution and can dispense the internal solution by the pushing operation. Also, the type of content liquid is not limited.

DESCRIPTION OF SYMBOLS 1 Single use syringe 2 Syringe 2a Front end part 2b Neck part 2c Body part 2d Finger hook part 2e Annular wall 2e ₁ Front end 2e ₂ Rear end 2f Cylindrical body part 3 Through-hole 3a Small-diameter hole 3b Medium-diameter hole 3c Large-diameter hole 4 Piston 4a Piston front-end 5 Plunger 5a Guide 5a ₁ Plate member 5b Rear end 5p Protrusion 6 Needle parts 7 Needle 8 Needle holder 10 Sleeve member 10a Sleeve member upper end 10b Sleeve member rear end 10c Groove 10d Slope 10f ₁ Inner peripheral surface 10f ₂ Outer peripheral surface 10p Projection 10s Step 11 Protrusion slope 21 Long hole rear edge 22 Long hole tip 23 Long hole slope 24 Step

Claims (4)

A syringe, a piston that is slidably held in the through-hole of the syringe, and a plunger that pulls out and pushes the piston, and is drawn into the space formed between the syringe and the piston. A syringe that can be filled with an internal solution while the internal solution can be dispensed by being pushed in;
A sleeve member that has a passage that allows the plunger to pass therethrough and that can be disposed in the through hole of the syringe is provided.
A groove or slot that guides the plunger so that it can be pulled out from the sleeve member by fitting a protrusion provided on the plunger from the inside to the inner peripheral surface of the sleeve member, and pulling out the plunger for filling the internal solution While the protrusion over the groove or the long hole is hooked to provide a step portion for fixing and holding the plunger with respect to the sleeve member,
A protrusion provided on the sleeve member is joined to the inner peripheral surface of the syringe from the inside to prevent the sleeve member from being pulled out of the syringe, and a long hole portion or a groove portion that guides the sleeve member to be extrudable to the syringe. And a step for holding the sleeve member fixed to the syringe by hooking the projection over the slot or groove by pushing the plunger for pouring the inner solution. Syringe.   The single-use syringe according to claim 1, wherein an inclined surface on which the protrusion provided on the plunger can ride is provided in a groove or a long hole provided on the inner peripheral surface of the sleeve member.   3. The single use according to claim 1 or 2, wherein a slanted surface on which the protrusion can be overcome is provided on the long hole or groove provided on the inner peripheral surface of the syringe and the protrusion provided on the sleeve member. Syringe.   4. The groove portion or the long hole portion and the step portion provided on the inner peripheral surface of the sleeve member and the protrusion portion provided on the outer peripheral surface of the sleeve member are alternately shifted in the circumferential direction according to claim 1. The single-use syringe is characterized in that a notch for separating the two is provided from the rear end of the sleeve member toward the pushing direction.

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