JP6305792B2 - Metered syringe type ejector - Google Patents

Description

  The present invention relates to a quantitative syringe-type ejector including a syringe and a plunger that is inserted from the rear end side of the syringe and pushes a piston by pressing an operation unit to eject the content liquid.

  As a syringe-type ejector for ejecting a content liquid such as a chemical solution, for example, as described in Patent Document 1, a plunger main body portion (a first body having a piston at the front end and an elastic arm (elastic piece) at the rear end is described. 1) and a plunger operating member (second shaft member) disposed on the rear end side of the plunger main body portion and pressing the elastic arm toward the front end side. In addition, a fixed-quantity syringe-type jet provided with a sliding projection that deflects the elastic arm inward while sliding on the inner peripheral surface of the syringe, and a locking projection that is locked by the syringe and temporarily stops the plunger from being pushed The vessel is known. According to this fixed quantity syringe type ejector, the plunger can be pushed in again only by loosening or releasing the paused plunger, so that the content liquid can be ejected in small portions with a simple operation. it can.

JP 2013-208603 A

  By the way, since the fixed-quantity syringe type ejector described in patent document 1 can pull back a plunger after pouring out all the contents liquid, this can be done several times by refilling a new contents liquid in a syringe. It is possible to use. However, depending on the situation of the site where such an ejector is used, it may not be preferable to reuse it for hygiene purposes.

  An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a novel metering syringe type ejector that can prevent reuse after being used once.

In order to solve the above-mentioned problems, a fixed-quantity syringe-type ejector according to the present invention is inserted from a syringe and a rear end side of the syringe, and pushes a piston by pressing an operation portion provided at the rear end portion to eject a content liquid A quantitative syringe-type ejector comprising a plunger
At the end of pushing of the plunger, the operation unit is housed inside the syringe so as not to be pulled back.

  Moreover, in the fixed-quantity syringe type ejector which concerns on this invention, it is preferable that the said syringe has an accommodation cylinder part which accommodates this operation part inside at the time of completion | finish of pushing of the said plunger.

  Moreover, in the metering syringe type ejector according to the present invention, the rear end surface of the operation unit is flush with the rear end surface of the syringe or forward of the rear end surface of the syringe at the end of pushing of the plunger. It is preferably located on the side.

  ADVANTAGE OF THE INVENTION According to this invention, the novel metering syringe type ejector which can prevent the reuse after once using can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view in a front view and a partially enlarged view of an embodiment of a metered syringe syringe according to the present invention. It is the disassembled perspective view which showed typically a part of plunger main-body part and a plunger operation member regarding the plunger shown in FIG. The situation where the plunger is pushed in with respect to the metering syringe type ejector shown in FIG. 1 will be described. (A) is a cross-sectional view showing a state in which the first ejection is started, and (b) is the first ejection. It is sectional drawing which shows the state which was complete | finished, (c) is sectional drawing which shows the state which loosened the pushing-in of the plunger operation member in order to start the 2nd ejection, or the state which cancelled | released, (d) is 2 It is sectional drawing which shows the state which the ejection of the 1st time was complete | finished. It is a modification of the fixed_quantity | quantitative_assay syringe ejector shown in FIG. 1, Comprising: (a) is a half sectional view which shows the plunger operation member used for this, (b) is A arrow directional view of Fig.4 (a). (C) is a cross-sectional view showing a state in which the second ejection is completed.

  Hereinafter, with reference to drawings, the fixed-quantity syringe type ejector of the present invention is explained. In addition, in this specification, a claim, and an abstract, the front end side is a side where the nozzle 20 is located when the syringe body 10 shown in FIG. 1 is used as a reference, and vice versa. On the side.

  In FIG. 1, the code | symbol 1 shows one Embodiment of the metering syringe type ejector according to this invention. The fixed quantity syringe type ejector 1 includes a syringe 2 and a plunger 3 inserted from the rear end side of the syringe 2. The syringe 2 in the present embodiment includes a syringe body 10, a nozzle 20 attached to the distal end side of the syringe body 10, and a holder 30 attached to the rear end side of the syringe body 10. The plunger 3 includes a plunger main body portion 40, a piston P attached to the distal end side of the plunger main body portion 40, and a plunger operation member 50 attached to the rear end side of the plunger main body portion 40. Yes.

  The syringe body 10 is made of, for example, synthetic resin or glass. The syringe body 10 has a hollow body portion 11 (cylindrical in the present embodiment) that can be filled with a content liquid (for example, nasal drops) M. The body portion 11 has a body portion 11 through a shoulder portion 12. The tip portion 13 having a smaller diameter than the portion 11 is integrally connected. A through hole 14 is formed inside the distal end portion 13. In addition, a protrusion 15 is provided at the rear end of the body 11 so as to protrude outward from the outer peripheral surface of the body 11 in the radial direction (direction perpendicular to the central axis O of the metered syringe injector 1). .

  The nozzle 20 has a nozzle body 21 that is detachably or non-detachably fitted to the distal end portion 13. A nozzle tip 22 is built in the nozzle body 21. Further, a nozzle outlet 23 communicating with the nozzle tip 22 is formed at the distal end side of the nozzle body 21. In addition, you may shape | mold the nozzle 20 and the syringe main body 10 integrally.

  In this embodiment, the holder 30 is made of a synthetic resin. The holder 30 extends radially outward, and has a plate-like finger hook portion 31 having a concave portion 31a for accommodating and holding the protrusion 15 therein, and an annular shape protruding rearward from the rear end surface 31b of the finger hook portion 31. And an accommodating cylinder portion 32. In addition, as for the finger hook part 31, the circumferential direction part is notched and this is connected with the recessed part 31a. Thereby, the holder 30 is attached to the syringe body 10 so as to slide from the radially outer side to the inner side.

  The finger hook 31 is formed with an opening 31c through which the plunger 3 is inserted. That is, the inner edge of the opening 31 c is provided so as to be continuous with the inner peripheral surface 10 a of the syringe body 10.

  The plunger main body portion 40 includes, for example, a screw-like tip portion 41 provided on the tip side thereof, and a rod portion 42 that is integrally connected to the tip portion 41 and extends toward the rear side. The rod portion 42 in the present embodiment is a vertically long combination of disc-shaped disks 42a and 42b arranged on the front end side and rear end side thereof, and a cross-shaped cross section that integrally connects the disks 42a and 42b. The four plate portions 42c.

  Here, a piston (gasket) P is held by the distal end portion 41 on the distal end side of the plunger main body portion 40. Piston P consists of elastic materials, such as rubber | gum, for example, and contact | abuts to the internal peripheral surface 10a of the syringe main body 10 so that sliding is possible. A filling space S for filling the content liquid M is formed between the piston P and the syringe body 10.

  On the rear end side of the plunger main body portion 40, a shaft 43 that is integrally connected to the central portion of the disk 42b is provided. As shown in FIG. 2, the shaft 43 has a large-diameter portion 43a having substantially the same diameter as the plate portion 42c, and a small-diameter portion 43b having a smaller diameter than the large-diameter portion 43a. The shaft 43 is formed with a recessed surface 43c that is recessed in a flat manner from the large diameter portion 43a to the small diameter portion 43b at positions opposite to each other across the axis O. Further, the small-diameter portion 43b is formed with an annular groove 43d that circulates around the axis O on the rear end side. By forming the annular groove 43d in the small diameter portion 43b, a head 43e is formed at the rear end of the shaft 43. The head 43e has an inclined surface 43f that tapers from the front end side toward the rear end side.

  The disk 42b is integrally provided with two elastic arms 44 at positions facing the shaft 43 (position facing the recessed surface 43c). The elastic arm 44 is formed in a flat plate shape and extends along the axis O from a fixed end 44a integrally connected to the disk 42b. When an external force toward the distal end is applied to the rear end portion of the elastic arm 44, the elastic arm 44 bends inward (direction approaching the axis O) from the initial position shown in FIG. 1 and releases the external force. Thus, the initial position is restored from the fixed end 44a. In the present embodiment, the elastic arm 44 is formed with a thickness that is easily bent and easily restored. In this embodiment, the elastic arm 44 extends from the disk 42b. However, the present invention is not limited to this, and the elastic arm 44 may be integrally extended from the shaft 43.

  The elastic arm 44 has a protrusion (sliding protrusion) 45 protruding outward in the radial direction. The outer diameter of the sliding protrusion 45 is set to be larger than the inner diameter of the inner peripheral surface 10a. Further, the sliding protrusion 45 has an inclined surface 45 a that tapers toward the fixed end 44 a of the elastic arm 44. With such a configuration, when the plunger main body 40 is pushed into the syringe main body 10, the inclined surface 45 a comes into contact with the inner edge of the opening 31 c and can induce inward bending in the elastic arm 44. The elastic arm 44 can easily enter the syringe body 10. Further, when the plunger main body 40 is pushed into the syringe main body 10, the sliding protrusion 45 abuts on the inner peripheral surface 10a so as to be slidable.

  Further, as shown in FIG. 2, the elastic arm 44 has a protrusion (locking protrusion) 46 that is integrally connected to the rear end portion thereof and protrudes radially outward. The locking protrusion 46 is provided on the rear end side of the sliding protrusion 45 and with a gap with respect to the sliding protrusion 45. The outer diameter at the radially outer end of the locking projection 46 is larger than the inner diameter of the opening 31c when the sliding projection 45 is in contact with the inner peripheral surface 10a as shown in FIG. Is set. Thereby, when the plunger main body 40 is pushed into the syringe main body 10, the locking projection 46 is locked to the rear end surface 31 b (the inner edge of the opening 31 c) of the finger hook portion 31.

  Here, the free end 44b of the elastic arm 44 (the surface on the rear end side of the locking projection 46) is radially outward with respect to the surface (horizontal plane) F perpendicular to the axis O as shown in the enlarged view of FIG. As it goes, it is formed as a tapered surface inclined at an angle θ from the rear end side toward the front end side. For example, the angle θ is set so that the free end 44b is parallel to the horizontal line F when the elastic arm 44 is bent inward from the fixed end 44a. In addition, the value of θ can be changed as appropriate according to the size of the metered syringe type ejector 1 and the like.

  In addition, as shown in the enlarged view of FIG. 1, a step 47 is provided on the radially inner side of the locking projection 46. The step 47 is formed by a flat step bottom surface 47a extending in the horizontal direction and a step side surface 47b connected to the step bottom surface 47a. Further, the step side surface 47 b is formed as a tapered surface that is inclined radially outward from the step bottom surface 47 a toward the free end 44 b of the elastic arm 44.

  The plunger operation member 50 has a cylindrical main body 51 as shown in FIG. 2, and a disc-shaped operation portion 52 that is a part where the user directly presses a finger is integrated with the rear end of the main body 51. Is provided. In the present embodiment, the outer diameter of the operation portion 52 is set to be larger than the outer diameter of the main body 51 and slightly smaller than the inner diameter of the housing cylinder portion 32, but is not limited to this. The outer diameter may be the same as the outer diameter of the main body 51. An annular protrusion 53 that protrudes radially inward is provided on the inner peripheral surface of the main body 51. The inner diameter of the main body 51 is set to be equal to or slightly larger than the outer diameter of the small diameter portion 43b of the shaft 43, and the inner diameter at the radially inner end of the annular protrusion 53 is equal to or greater than the outer diameter of the annular groove 43d. It is set to be less than the outer diameter of the small diameter portion 43b. Further, the axial length of the annular protrusion 53 is set to be less than the axial length of the annular groove 43d. Thereby, the plunger operating member 50 is slidably held with respect to the plunger main body portion 40 by inserting the shaft 43 into the main body 51. When the shaft 43 is inserted into the main body 51, the inclined surface 43f of the shaft 43 comes into contact with the annular protrusion 53 and induces the head 43e to get over, so that the assembling work is facilitated.

  The main body 51 has a notch 54 formed from the front end side to the rear end side. In the present embodiment, the elastic arm 44 is formed at two positions facing each other with the axis O therebetween. The notch 54 has a width slightly larger than the lateral width of the elastic arm 44, and the elastic arm 44 is operably accommodated to ensure movement of the elastic arm 44 along the radial direction.

  Further, the end portion on the rear end side of the notch 54 shown in FIG. 2 functions as a contact end portion 55 that abuts against the elastic arm 44 when sliding to the front end side. As shown in the enlarged view of FIG. 1, the contact end portion 55 is formed by a contact end surface 55 a that extends horizontally and a contact side surface 55 b that extends along the axis O. The abutting end surface 55a functions as a pressing surface having a stepped bottom surface 47a provided on the elastic arm 44 as a pressure receiving surface. That is, by applying a pressing force to the operation portion 52, the abutting end surface 55a presses the step bottom surface 47a of the plunger main body portion 40, whereby the plunger main body portion 40 can be pushed into the syringe main body 10. . The abutting side surface 55b can be restrained so that the elastic arm 44 does not fall inward in the radial direction when contacting the stepped side surface 47b of the elastic arm 44.

  Next, the usage method of the fixed_quantity | assay syringe type ejector 1 which becomes the structure mentioned above is demonstrated. First, in the state shown in FIG. 1 (FIG. 3A), the user places the index finger and the middle finger, for example, on the finger-hanging portion 31, and presses the operation portion 52 with the thumb to hold the quantitative syringe-type ejector 1. When the plunger operating member 50 is pushed in with the thumb, the inclined surface 45a comes into contact with the inner edge of the opening 31c, and the elastic arm 44 enters the syringe body 10 while bending inward. At this time, since the plunger main body 40 pushed by the plunger operating member 50 pushes the piston P toward the tip side, the content liquid M in the filling space S passes through the through hole 14 and the nozzle tip 22. Are ejected from the ejection port 23 (first ejection starts).

  If the pressing to the plunger operating member 50 is continued, the plunger main body 40 is pushed toward the distal end side while the sliding protrusion 45 slides on the inner peripheral surface 10a of the syringe main body 10. As shown in FIG. 3B, the plunger operating member 50 can be pushed in when the locking projection 46 of the elastic arm 44 comes into contact with the rear end surface 31b of the finger hook 31 (the inner edge of the opening 31c). Therefore, the first ejection ends with the content liquid M remaining in the filling space S. In this state, the elastic arm 44 is bent inward with the fixed end 44 a as a starting point, and the abutting end surface 55 a of the plunger operating member 50 is formed on the elastic arm 44 as shown in the enlarged view of FIG. 1. While contacting the step bottom surface 47a, the abutting side surface 55b is in a state of being accommodated inside the step side surface 47b. For this reason, the free end 44b of the elastic arm 44 is restrained from being deformed in the radial direction, and an intermediate portion between the fixed end 44a and the free end 44b is bent inward. Further, as shown in FIG. 2, since the shaft 43 is provided with a recessed surface 43c at a position facing the elastic arm 44, the shaft 43 does not interfere with the shaft 43 even when the elastic arm 44 is bent inward. . For this reason, a large deflection amount of the elastic arm 44 is ensured without increasing the radial dimension of the plunger operating member 50. Although illustration is omitted, for example, a concave portion or a convex portion is formed on the inner peripheral surface 10a of the syringe body 10, and the sliding projection 45 is locked to this step portion when the first ejection is completed. May be. In this case, since the plunger main body 40 does not move to the rear end side from the position where the first ejection is finished, an accurate ejection amount can be achieved.

  Next, when the push-in of the plunger operating member 50 is loosened or released, as shown in FIG. 3 (c), the fixed end 44 a side of the elastic arm 44 is a sliding protrusion that contacts the inner peripheral surface 10 a of the syringe body 10. Therefore, only the free end 44b side of the elastic arm 44 is deformed (restored) diagonally inward starting from the sliding protrusion 45. As a result, the locking projection 46 is displaced obliquely inward, and the locking state between the locking projection 46 and the rear end surface 31b is automatically released. As shown in the enlarged view of FIG. 1, the step side surface 47b is formed as a tapered surface. As a result, the stepped side surface 47b acts to push the abutting end portion 55 toward the rear end side when the elastic arm 44 is restored, so that the locked state is more reliably released. In addition, you may employ | adopt the structure which picks up the plunger operation member 50 with a finger | toe, and cancels | releases a latching state and pulls back to the rear end side.

  If the plunger operating member 50 is pushed in again from the state of FIG. 3C, the abutting end surface 55a presses the free end 44b, and the second ejection is possible. As shown in the enlarged view of FIG. 1, since the free end 44b of the elastic arm 44 is tapered at an angle θ, in the state where the free end 44b side of the elastic arm 44 shown in FIG. The free end 44b is in a state close to being parallel to the end face 55a. For this reason, pushing of the plunger main-body part 40 can be performed smoothly.

  When the plunger operation member 50 is pushed all the way to the end of the second ejection (the state shown in FIG. 3D), the operation unit 52 is provided inside the syringe 2, more specifically, on the finger hook unit 31. It is accommodated inside the accommodating cylinder part 32. Thereby, since it becomes impossible to pick the plunger operation member 50 with a finger | toe, the pullback of the plunger 3 can be prevented. As a result, the syringe body 10 cannot be refilled with the content liquid, and the reuse of the quantitative syringe type ejector 1 can be prevented.

  In the metered syringe type ejector 1 of the present embodiment, the rear end surface 52a of the operation portion 52 is flush with or accommodates the rear end surface 32a of the accommodating cylinder portion 32 of the syringe 2 when the plunger 3 is completely pushed. It is preferable that the cylinder portion 32 is positioned on the front side of the rear end surface 32a. Thereby, pulling back of the plunger 3 can be prevented more reliably.

  FIGS. 4A to 4C are modified examples of the above-described metered syringe type ejector 1 and show a metered syringe type ejector 100 having a plunger operation member 150 having a different configuration. As shown in FIGS. 4A and 4B, the plunger operation member 150 has a pair of elastic pieces 56 provided on the side wall of the main body 51. The elastic piece 56 extends from the fixed end 56a integrally connected to the main body 51 along the axis O, and is formed so as to be elastically deformable inward (direction approaching the axis O) from the fixed end 56a. In the present embodiment, the elastic piece 56 is formed with a thickness that is easily bent and easily restored.

  A protrusion 56b that protrudes radially outward is provided at the distal end of the elastic piece 56, and the outer diameter of the protrusion 56b is set to be larger than the inner diameter of the finger hook 31 opening 31c. . Further, the protrusion 56b has an inclined surface 56c that is tapered toward the fixed end 56a.

  When using the fixed quantity syringe type ejector 100 of this embodiment, the plunger main body 40 is moved into the syringe main body 10 by pressing the operation portion 52 of the plunger operation member 150 as in the previous embodiment. Push in to end the first jet. Thereafter, when the plunger operation member 150 is pushed into the syringe body 10 at the time of the second ejection, the inclined surface 56c comes into contact with the inner edge of the opening 31c to induce inward bending of the elastic piece 56. As shown in FIG. 4 (c), the protrusion 56b is formed at the inner edge of the opening 31c (on the rear end side of the finger hook portion 31) at the time when the second ejection is completed by continuing to press the plunger operating member 150. It is located on the tip side of the wall 31d). For this reason, the elastic piece 56 is restored toward the radially outer side, the radially outer end of the projection 56b projects outward from the inner edge of the opening 31c, and the projection 56b is formed on the wall 31d on the rear end side of the finger hanging portion 31. It will be locked. As a result, since the plunger operating member 150 is prevented from being pulled back to the rear end side, it is possible to more reliably prevent the metered syringe type ejector 100 from being reused. In the present embodiment, the accommodating cylinder portion 32 is not provided, and the plunger 3 can be reliably prevented from being pulled back even if the operation portion 52 is exposed.

  The metering syringe type ejector according to the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope according to the claims. For example, it is good also as a structure which sets the external shape of the operation part 52 smaller than the opening part 31c, and the operation part 52 is accommodated in the opening part 31c at the time of completion | finish of pushing of the plunger 3. FIG. In this case, it is not necessary to provide the accommodation cylinder part 32, and the shape as the whole ejector can be reduced in size. In this case as well, it is preferable that the rear end surface 52a of the operation unit 52 be positioned on the same plane as the rear end surface 31b of the finger hanging portion 31 or on the front side of the rear end surface 31b of the finger hanging portion 31. Thereby, pulling back of the plunger 3 can be prevented more reliably. Further, the protruding portion of the syringe main body and the finger hooking portion of the holder may be omitted. In this case, for example, the outer peripheral surface of the syringe main body may be fitted and held on the inner peripheral surface of the holder. It is also possible to omit the shoulder and tip of the syringe body and to attach the nozzle directly to the barrel of the syringe body. Further, the plunger operating member extends from the rear end side to the front end side so that the shaft provided in the plunger main body and the through hole of the plunger operating member through which the shaft is inserted are interchanged. And a concave portion (hole) through which the shaft is inserted may be provided in the plunger main body.

The present invention can be employed in various forms as long as it is a metering syringe type ejector provided with a syringe and a plunger that can be pushed into the syringe, and various liquid contents can be employed. it can.

DESCRIPTION OF SYMBOLS 1 Metering syringe type ejector 2 Syringe 3 Plunger 10 Syringe main body 10a Inner peripheral surface 11 Body part 12 Shoulder part 13 Tip part 14 Through-hole 15 Protrusion part 20 Nozzle 21 Nozzle main body 22 Nozzle tip 23 Outlet 30 Holder 31 Finger hook part 31a Recessed portion 31b Rear end surface 31c Opening portion 31d Rear end side wall 32 Housing cylinder portion 32a Rear end surface 40 Plunger main body portion 41 Front end portion 42 Rod portion 42a, 42b Disc 42c Plate portion 43 Shaft 43a Large diameter portion 43b Small diameter portion 43c Recessed surface 43d annular groove 43e head 43f inclined surface 44 elastic arm 44a fixed end 44b free end 45 sliding projection 45a inclined surface 46 locking projection 47 step 47a step bottom surface 47b step side surface 50 plunger operating member 51 main body 52 operation portion 52a rear end surface 53 Side M content liquid P piston S filling space abuts Jo projection 54 notch 55 abutting end 55a abutting end face 55b

Claims (3)

A fixed-quantity syringe-type ejector comprising a syringe and a plunger that is inserted from the rear end side of the syringe and pushes the piston by pressing the operation unit provided at the rear end portion to eject the content liquid,
At the end of pushing of the plunger, the operation unit is configured to be housed inside the syringe so that it can not be pulled back .
The syringe includes a syringe body and a holder attached to the rear end side of the syringe body,
The holder has a plate-like finger hook portion provided with a recess that accommodates and holds a protruding portion that protrudes radially outward from the outer peripheral surface of the syringe body,
A notch connected to the concave portion is formed in a part of the finger hook in the circumferential direction,
The metering syringe ejector according to claim 1, wherein at the end of pushing of the plunger, the rear end surface of the operation portion is positioned in front of the rear end surface of the syringe. The metering syringe ejector according to claim 1, wherein the finger-hanging portion has an accommodating cylinder portion that accommodates the operation portion inside when the plunger is completely pushed. The plunger includes an elastic piece provided in an inward elastically deformable manner,
The protrusion of the said elastic piece is provided with the protrusion which can be latched by the wall of the rear-end side of the said finger-hanging part, and can prevent the pulling back of an operation part at the time of completion | finish of pushing of the said plunger. Quantitative syringe type ejector.

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