WO2020189150A1

WO2020189150A1 - Plunger pressing tool

Info

Publication number: WO2020189150A1
Application number: PCT/JP2020/006310
Authority: WO
Inventors: 順紀阿部
Original assignee: テルモ株式会社
Priority date: 2019-03-20
Filing date: 2020-02-18
Publication date: 2020-09-24
Also published as: JP2022068388A

Abstract

The present invention is a plunger pressing tool 1 for a syringe, wherein a handle part 16 is rotatable about a hinge part 15 provided to a body part 11, in the direction toward an outer tube 31 mounted to a syringe mounting part 13 and in the direction away from the outer tube 31, and by rotating the handle part 16 in the direction away from the outer tube 31, the entire handle part 16 is movable above an extension line: A2 that is the center axis of the outer tube 31 mounted to the syringe mounting part 13.

Description

Plunger presser

The present invention relates to a plunger presser for pressing a plunger of a syringe.

Conventionally, a syringe (prefilled syringe) pre-filled with a chemical solution or the like has been known. Such a prefilled syringe includes an outer cylinder filled with a chemical solution, a gasket slidably housed in the outer cylinder, and a plunger for moving the gasket. The prefilled syringe may be filled with a highly viscous chemical solution, which creates a large resistance when pressing the plunger.

On the other hand, various devices for assisting the pressing of the plunger using the principle of leverage are disclosed. For example, the injection device disclosed in Japanese Patent Application Laid-Open No. 2018-5007087 (Patent Document 1) includes a housing for holding a syringe and a plunger, a trigger held in the housing, and a lever including a cam communicating with the trigger. .. The cam communicates with the flange of the syringe. In response to the actuation of the trigger to eject the fluid from the syringe, the upper end of the cam moves longitudinally towards the ejection end of the syringe. As a result, the plunger (a pin provided integrally with the syringe) of the syringe is linearly translated, and the fluid is discharged from the syringe. The trigger and the lever are integrally configured, and they are configured to rotate around a pivot point (trigger pivot) provided between the trigger and the lever.

Special Table 2018-507087 (WO2016-138018, US publication 2017-319783, US publication 2017-281875)

The prefilled syringe is filled with various chemicals, and their characteristics such as viscosity are different. In some cases, it is necessary to inject the drug solution into a very limited specific target (site), and when the plunger is directly pressed to see if a certain drug solution is injected into the desired target. There is a request to confirm by the resistance felt by the operator.

On the other hand, in a device such as Patent Document 1, if a syringe is attached to the injection device for injection of a drug solution, it is impossible to directly press the plunger. It is also difficult to remove the syringe from the injection device during the operation. Furthermore, it is difficult to adjust the plunger pressing resistance corresponding to the chemical solution and the operator.

An object of the present invention is to provide a plunger pressing tool capable of adjusting the resistance at the time of pressing the plunger to a desired degree and directly checking the pressing resistance of the plunger at an arbitrary timing during operation. is there.

Those that achieve the above objectives are as follows.
A plunger press for a syringe including an outer cylinder, a gasket slidably housed in the outer cylinder, and a plunger for moving the gasket.
The plunger pressing tool is provided on a grip portion having a syringe mounting portion on which the syringe can be mounted on the outer cylinder, an extending portion extending rearward from the upper portion of the grip portion, and a rear portion of the extending portion. A main body portion having a hinge portion and a handle portion rotatably held by the hinge portion are provided.
The handle portion includes a contact portion of the mounted syringe with respect to the rear end portion of the plunger, and an operation portion extending downward from the contact portion.
The handle portion can be rotated around the hinge portion in the direction of the outer cylinder mounted on the syringe mounting portion and in the direction away from the outer cylinder, and is rotated in the direction away from the outer cylinder. As a result, the plunger pressing tool is capable of moving the entire handle portion upward from the extension line of the central axis of the outer cylinder mounted on the syringe mounting portion.

FIG. 1 is a front view of a plunger pressing tool according to an embodiment of the present invention to which a syringe is attached, and is an explanatory view (at the start of operation) for explaining the operation of the plunger pressing tool. FIG. 2 is a left side view of the plunger pressing tool shown in FIG. FIG. 3 is a right side view of the plunger pressing tool shown in FIG. FIG. 4 is a plan view of the plunger pressing tool shown in FIG. FIG. 5 is a bottom view of the plunger pressing tool shown in FIG. FIG. 6 is a cross-sectional view taken along the line AA in FIG. FIG. 7 is an enlarged view of part B in FIG. FIG. 8 is a perspective view of the plunger pressing tool shown in FIG. FIG. 9 is another perspective view of the plunger pressing tool shown in FIG. FIG. 10 is an explanatory diagram (during operation) for explaining the operation of the plunger pressing tool of the present invention. FIG. 11 is an explanatory diagram (when the operation is completed) for explaining the operation of the plunger pressing tool of the present invention. FIG. 12 is an explanatory diagram for explaining the operation of the plunger pressing tool of the present invention. FIG. 13 is an explanatory diagram for explaining the operation of the plunger pressing tool of the present invention. FIG. 14 is a front view of the plunger pressing tool of another embodiment of the present invention to which the syringe is attached, and is an explanatory view (at the start of operation) for explaining the operation of the plunger pressing tool. FIG. 15 is an explanatory diagram (during operation) for explaining the operation of the plunger pressing tool shown in FIG. FIG. 16 is an explanatory diagram (at the time of completion of the operation) for explaining the operation of the plunger pressing tool shown in FIG. FIG. 17 is an enlarged explanatory view for explaining the locus of the contact portion during the operation of the plunger pressing tool shown in FIG. FIG. 18 is an enlarged explanatory view for explaining the locus of the contact portion during the operation of the plunger pressing tool of another embodiment of the present invention. FIG. 19 is a front view of a plunger presser according to still another embodiment of the present invention to which a syringe is attached.

The plunger presser of the present invention will be described with reference to the examples shown in the drawings.
The plunger pressing tool 1 of the present invention is a plunger pressing tool for a syringe including an outer cylinder, a gasket slidably housed in the outer cylinder, and a plunger for moving the gasket.

1 to 9 show a front view, a left side view, a right side view, a plan view, a bottom view, a cross-sectional view, and a perspective view of a state in which the syringe 3 is attached to the plunger pressing tool 1, respectively. There is. In the present embodiment, the vertical direction in FIG. 1 will be described as the vertical direction, and the horizontal direction will be described as the front-rear direction (the left side is the front side and the right side is the rear side). It does not specify.

The plunger pressing tool 1 of the present invention includes a plunger pressing tool 1 for a syringe 3 including an outer cylinder 31, a gasket 35 slidably housed in the outer cylinder 31, and a plunger 36 for moving the gasket. Is. The plunger pressing tool 1 includes a grip portion 12 having a syringe mounting portion 13 on which a syringe 3 can be mounted on an outer cylinder 31, an extending portion 14 extending rearward from the upper portion of the grip portion 12, and a rear portion of the extending portion 14. The main body portion 11 including the hinge portion 15 provided on the hinge portion 15 and the handle portion 16 rotatably held by the hinge portion 15 are provided. The handle portion 16 includes a contact portion 17 for the rear end portion (pressing portion 36b) of the plunger 36 of the mounted syringe 3, and an operation portion 18 extending downward from the contact portion 17. The handle portion 16 can be rotated around the hinge portion 15 in the direction of the outer cylinder 31 mounted on the syringe mounting portion 13 (outer cylinder direction) and in the direction away from the outer cylinder 31, and from the outer cylinder 31. By rotating in the separating direction, the entire handle portion 16 can be moved upward from the extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13: A2.

The plunger pressing tool 1 includes a main body portion 11 and a handle portion 16.

The main body 11 of the plunger pressing tool 1 includes a grip portion 12 including a syringe mounting portion 13, an extension portion 14 extending rearward from the upper portion of the grip portion 12, and a hinge portion 15 provided at the rear portion of the extension portion 14. And.

The grip portion 12 has a substantially rod shape. A cylindrical syringe mounting portion 13 is provided on the upper portion of the grip portion 12 (a portion above the center of the grip portion 12 in the longitudinal direction). The syringe mounting portion 13 preferably regulates the rotation and detachment of the mounted outer cylinder 31. In this embodiment, the inner diameter of the syringe mounting portion 13 is equal to or slightly larger than the outer diameter of the outer cylinder 31 of the syringe 3 described later. Further, an annular minute convex portion 13a that slightly protrudes inward is formed on the inner peripheral surface of the rear portion of the syringe mounting portion 13, and is provided on the outer peripheral surface of the outer cylinder 31 of the syringe 3 described later. Engage with the small recess 31a. In this embodiment, the outer cylinder 31 mounted on the syringe mounting portion 13 is restricted from rotating and detaching. The syringe mounting portion may be of a type in which the tip end surface of the flange portion of the outer cylinder of the syringe abuts on the rear end surface.

The inner diameter of the syringe mounting portion 13 is preferably 15 to 32 mm. Further, the length of the syringe mounting portion 13 is preferably 5 to 50 mm. It is preferable that the syringe mounting portion 13 has a diameter slightly increased toward the rear end side.

It is preferable that the main body portion 11 does not deform at the time of use at the grip portion 12 and at the boundary portion between the grip portion 12 and the syringe mounting portion 13. Therefore, the main body 11 is preferably formed of a metal material or a hard resin.

The grip portion 12 preferably has a shape that is easy for the operator to grip. In this embodiment, the grip portion 12 is provided with

inclined surfaces

12a and 12b on both sides of the portion below the syringe mounting portion 13 of the grip portion 12 so that the cross-sectional area thereof gradually decreases toward the front. Further, it is preferable that the lower end portion of the grip portion 12 extends to a position equivalent to the lower end portion of the handle portion 16 described later. It is assumed that the operator grips the grip portion 12 extending downward from the syringe mounting portion 13, but the grip portion 12 is not limited to this, and the grip portion 12 is further inserted from the syringe mounting portion 13 so as to sandwich the syringe mounting portion 13. The operator may be configured to grip the portion extending upward.

In this embodiment, the extending portion 14 is integrally formed with the grip portion 12, and extends rearward from the upper part of the grip portion 12. It should be noted that the tip portion of the extension portion, which is a separate member, may be fixed to the upper end portion of the grip portion instead of the one-piece object. In this embodiment, the extension portion 14 includes a portion extending upward from the syringe mounting portion 13 located at the upper end of the grip portion 12. The portion extending upward is formed to have the same width as the syringe mounting portion 13. The extending portion 14 includes a portion extending rearward from the upper end of the above-mentioned upward extending portion. In this embodiment, the angle formed by the upwardly extending portion and the rearwardly extending portion of the extending portion 14 is a substantially right angle. A hinge portion 15 is provided at the rear portion of the extension portion 14, specifically, at the rear end portion. Locking recesses 14a are formed on both outer surfaces of the extending portion 14. The two

locking recesses

14a and 14a have shapes that can be fitted with the locking

protrusions

19a and 19a formed on the

arm portions

19 and 19 of the handle portion 16 described later, respectively.

The hinge portion 15 has a structure for rotatably supporting the handle portion 16 to be attached around the rotation axis: A1 of the hinge portion 15, and a known bearing, a mechanism using a bearing or the like is used. The handle portion 16 is rotatably attached to the main body portion 11 of the plunger pressing tool 1 by the hinge portion 15. The hinge portion 15 is located above the extension line of the central axis of the syringe mounting portion 13 by a predetermined length, and is located behind the rear end of the syringe mounting portion 13 by a predetermined length. The hinge portion 15 is located obliquely above the rear end of the rear end of the syringe mounting portion 13. The distance between the hinge portion 15 and the extension line of the central axis of the syringe mounting portion 13 is preferably about 25 to 60 mm.

The handle portion 16 is a substantially curved rod-shaped body. The handle portion 16 is attached to the hinge portion 15 by two

arm portions

19 and 19 formed on the upper portion thereof. The distance between the two

arm portions

19 and 19 is larger than the width of the extension portion 14. An interference avoidance notch 20 having a width dimension (dimension in the left-right direction in FIG. 3) larger than that of the extension portion 14 is formed between the

arm portions

19 and 19. The handle portion 16 does not interfere with the extension portion 14 because the rear end portion of the extension portion 14 can enter the portion where the interference avoidance cutout portion 20 is formed. As a result, the handle portion 16 can be sufficiently rotated in the direction away from the outer cylinder 31 of the syringe 3 (counterclockwise direction in FIG. 1).

Locking protrusions 19a are provided on the inner surfaces of the arm portions 19 and 19 (the surfaces of the two

arm portions

19 and 19 facing each other). The two locking

protrusions

19a and 19a have a shape that can be fitted with the locking recesses 14a and 14a formed in the extension portion 14 described above, respectively.

Further, in the plunger pressing tool 1 of the present embodiment, as shown in FIG. 13, the handle portion 16 is rotated in the direction away from the outer cylinder 31, so that the entire handle portion 16 is placed on the upper portion of the extending portion 14. It is movable. In other words, in the plunger pressing tool 1, the interference avoidance cutout portion 20 has a size such that the handle portion 16 and the extension portion 14 do not interfere with each other until the entire handle portion 16 moves to the upper portion of the extension portion 14. It is formed. As a result, particularly when the operator directly presses the plunger 36 in the plunger pressing tool 1 of the present embodiment, which is premised on gripping and operating the portion of the grip portion 12 extending below the syringe mounting portion 13. In addition, the handle portion 16 is less likely to be an obstacle, and workability is improved.

In the plunger pressing tool 1 of the present embodiment, in the state shown in FIG. 13, the bottom surface of the interference avoidance cutout portion 20 (the surface connecting the base ends of the arm portions 19 and 19) is the upper surface of the extending portion 14. Further rotation in the separation direction is restricted from the outer cylinder 31 of the handle portion 16 by contact (surface contact).

Further, in the present embodiment, the entire handle portion 16 moves to the front of the hinge portion 15 (rear portion of the extension portion 14). Therefore, when the operator directly presses the plunger 36 from the rear, the handle portion 16 is less likely to get in the way.

Specifically, as shown in FIG. 13, the handle portion 16 of this embodiment is from a state in which the handle portion 16 is in contact with the grip portion 12 (broken line state) until it rides on the extension portion 14. , It is rotatable around the hinge portion 15. At least, as shown in FIG. 12, the handle portion 16 has a horizontal extension line at the uppermost portion of the syringe to which the lower end of the handle portion is mounted (in the one shown in FIG. 12, the flange portion 34 of the outer cylinder and the plunger). It is preferable that the pressing portion 36b can be rotated to a position beyond the horizontal extension lines of both upper ends of the pressing portion 36b. With such a case, direct pressing of the pressing portion 36b of the plunger (white arrow: F in the figure) and attachment / detachment of the syringe 3 are easy.
In this embodiment, as shown in FIG. 13, the handle portion 16 is about 270 degrees (angle R) from the state where the handle portion 16 is in contact with the grip portion 12 (broken line state), with the hinge portion 15 as the center. It is rotatable. The handle portion 16 is preferably rotatable about 100 degrees or more around the hinge portion 15 from the state where the handle portion 16 is in contact with the grip portion 12 (broken line state).

In the state shown in FIG. 13, the plunger pressing tool 1 of this embodiment has locking

recesses

14a and 14a formed in the extending portion 14 and locking formed in the two arm portions 19 of the handle portion 16. The rotation of the handle portion 16 is temporarily impossible due to the fitting of the

convex portions

19a and 19a. That is, in the present embodiment, the locking concave portion 14a and the locking convex portion 19a cause the entire handle portion 16 to be above the extension line of the central axis of the outer cylinder 31: A2 (here, the upper portion of the extending portion 14). A stopper mechanism is configured to temporarily hold the handle portion 16 non-rotatably in the moved state. As a result, the handle portion 16 is rotated in the direction away from the outer cylinder 31 to a desired position above the extension line of the central axis of the outer cylinder 31: A2, and then the operator directly moves the plunger 36 from the rear. When pressing, it is not necessary to hold the handle portion 16 at the position, and the pressing of the plunger 36 can be concentrated.

A contact portion 17 is formed in an intermediate portion of the handle portion 16 (here, a portion above the center in the longitudinal direction of the handle portion 16). The contact portion 17 can come into contact with the rear end portion (pressing portion 36b) of the plunger 36 while the syringe 3 is held by the syringe mounting portion 13.

In the plunger pressing tool 1 of the present invention, the contact portion 17 is rotatable around the hinge portion 15 in the direction of the outer cylinder 31 mounted on the syringe mounting portion 13, and is as shown in FIG. 10 described later. In addition, the contact portion 17 when located directly below the hinge portion 15 is located on or slightly below the extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13. .. In the state shown in FIG. 1 (the state in which the contact portion 17 is brought into contact with the rear end portion (pressing portion 36b) of the plunger 36 before the pressing operation of the plunger 36), the contact portion 17 is the syringe mounting portion 13. It is located substantially on the extension line (A2) of the central axis of the outer cylinder 31 mounted on the outer cylinder 31.

In the present embodiment, the contact portion 17 is provided with

recesses

17a and 17b at its upper portion and lower portion, respectively, and has a linear shape extending substantially parallel to the rotation axis of the hinge portion 15: A1 (in the direction perpendicular to the paper surface in FIG. 1) at the central portion. It has a top 17c. The contact portion 17 includes a linear top portion 17c extending substantially parallel to the rotation axis of the hinge portion 15: A1.
Therefore, during pressing of the plunger, a contact portion (action) between the hinge portion (fulcrum) which is the center of rotation of the handle portion, the contact portion of the handle portion on which the plunger pressing pressure acts, and the rear end portion of the plunger. The distance between the points) is kept substantially constant. Therefore, the change in the pressing resistance during the pressing of the plunger can be suppressed.

The recess 17a is provided with an upper inclined surface having a linear top 17c as an apex. The recess 17b includes a lower inclined surface having a linear top 17c as an apex. The contact portion 17 moves on an arc whose radius is the distance between the contact portion 17 and the central axis of the hinge portion 15: A1 with the central axis of the hinge portion 15 as the center due to the rotation of the handle portion 16. To do. Similarly, the linear apex 17c is also centered on the central axis of the hinge portion 15: A1 by the rotation of the handle portion 16 while maintaining the state parallel to the center line of the hinge portion 15, and the linear apex 17c and the hinge. Central axis of unit 15: Moves on an arc whose radius is the distance between A1.

The handle portion 16 includes an operation portion 18 extending downward from the contact portion 17. In other words, in the handle portion 16, the contact portion 17 and the operation portion 18 are formed in that order in the same direction as viewed from the attachment portion to the hinge portion 15. From the viewpoint of further reducing the pressing resistance of the plunger 36, the distance between the contact portion 17 (linear top portion 17c) and the lower end of the operation portion 18 is determined by the rotation axis of the hinge portion 15: A1 and the contact portion 17. It is preferably longer than the distance between (linear tops 17c).
By doing so, the handle portion is rotated in the outer cylinder direction, that is, the plunger is directly pressed by pressing the operation portion of the handle portion so that the contact portion rotates in the outer cylinder direction. The plunger can be moved toward the outer cylinder with less force. In other words, the pressing resistance of the plunger can be reduced. Further, since the pressing direction of the operation unit and the pressing (moving) direction of the plunger match, the operability is good. Further, the pressing resistance can be adjusted (reduced) to a desired degree by arbitrarily selecting the position where the operator presses on the operation unit.
Further, the distance between the contact portion 17 (linear top 17c) and the lower end of the operation portion 18 is at least twice the distance between the rotation axis of the hinge portion 15: A1 and the contact portion 17 (linear top 17c). It is preferably present, and more preferably four times or more. Here, as shown in FIG. 1, the distance between the contact portion 17 and the lower end of the operation portion 18: D2 is about four times the distance between the rotation axis of the hinge portion 15: A1 and the contact portion 17: D1. It has become. Further, the operating portion 18 is curved rearward (in a direction away from the outer cylinder 31) from the contact portion 17 toward the lower end side. The handle is preferably curved as described above, but may be linear.

The syringe 3 attached to the plunger pressing tool 1 includes a cylindrical outer cylinder 31, a gasket 35 slidably housed in the outer cylinder 31, and a plunger 36 for moving the gasket 35. ..

Specifically, the outer cylinder 31 is a substantially tubular member that houses the gasket 35 in a liquid-tight and slidable manner. A nozzle portion 33 having a small diameter is provided at the tip portion of the outer cylinder 31, and the tip end side portion of the outer cylinder 31 has a tapered shape in which the diameter is reduced toward the nozzle portion 33. A flange 34 is provided at the rear end of the outer cylinder 31. The flange 34 has an arcuate outer edge formed so as to project in the vertical direction from the entire circumference of the rear end of the outer cylinder 31. Further, on the outer peripheral surface of the rear portion of the outer cylinder 31, an annular micro-concave portion 31a that can engage with the micro-convex portion 13a formed in the syringe mounting portion 13 described above is formed.

The gasket 35 is made of elastic rubber or synthetic resin. As shown in FIG. 6, the gasket 35 includes a substantially tubular main body portion 35a extending with substantially the same outer diameter, and a tapered closing portion 35b extending in the tip direction from the main body portion 35a. The outer surface of the main body 35a is in liquid-tight contact with the inner surface of the outer cylinder 31. The closed portion 35b of the gasket 35 has a shape (tapered shape) corresponding to the shape of the tip inner surface of the outer cylinder 31 so as not to form a gap between the two when it comes into contact with the tip inner surface of the outer cylinder 31. ..

The plunger 36 is made of a hard or semi-hard resin. In this embodiment, the plunger 36 includes a shaft portion 36a formed in a cross section and a disk-shaped pressing portion 36b provided at the rear end thereof. The tip of the shaft portion 36a is attached to the gasket 35. The gasket 35 moves integrally with the plunger 36.

In the outer cylinder 31, the space formed by the outer cylinder 31 and the gasket 35 is filled with the chemical solution 37 in advance. That is, the syringe 3 used in this embodiment is a so-called prefilled syringe. In the syringe 3, by pressing the plunger 36 toward the outer cylinder, the plunger 36 and the gasket 35 move to the tip side of the syringe 3, and the chemical solution 37 is moved from the nozzle portion 33 provided at the tip portion of the outer cylinder 31. Is discharged.

In the outer cylinder 31, a highly viscous chemical solution, particularly a chemical solution having a viscosity of 5 [mPa · s] or more, is filled as the chemical solution 37 filled in the space formed by the outer cylinder 31 and the gasket 35. When so, the plunger presser of the present invention is effective. Examples of such chemicals include medical liquids such as hyaluronic acid solutions, high-viscosity anticancer agents, high-viscosity biologics, and contrast agents.

Such a syringe 3 is attached to the syringe mounting portion 13 of the plunger pressing tool 1. Specifically, the syringe 3 is inserted from the rear of the syringe mounting portion 13, and the outer cylinder 31 is held by the syringe mounting portion 13 with a certain width in the longitudinal direction. At this time, as shown in FIG. 7, the micro-convex portion 13a provided on the inner peripheral surface of the syringe mounting portion 13 and the micro-concave portion 31a provided on the outer peripheral surface of the outer cylinder 31 of the syringe 3 engage with each other. As a result, the syringe 3 is held more firmly, particularly immovably in the anteroposterior direction. Further, when the syringe 3 is attached to the plunger pressing tool 1, the front end surface of the flange 34 of the outer cylinder 31 is substantially in contact with the rear end surface of the syringe mounting portion 13.

Subsequently, the action when the plunger pressing tool 1 is operated (when the plunger 36 is pressed) will be described with reference to FIGS. 1, 10 to 13.

First, a case where the handle portion 16 is rotated in the direction of the outer cylinder 31 (outer cylinder direction) will be described.
FIG. 1 shows a state at the start of operation of the plunger pressing tool 1 (at the start of pressing the plunger 36). At this time, the contact portion 17 of the handle portion 16 is in contact with the pressing portion 36b of the plunger 36. More specifically, the linear top portion 17c of the abutting portion 17 linearly abuts on the rear end surface of the pressing portion 36b. Here, the contact portion 17 (the contact portion between the linear top portion 17c and the pressing portion 36b) is on the extension line: A2 of the central axis of the outer cylinder 31 in the vertical direction. Further, in the state shown in FIG. 1, the upper inclined surface of the recess 17a of the contact portion 17 is substantially in contact with the pressing portion 36b of the plunger 36.

In this state, the operator grips the grip portion 12 and holds the plunger pressing tool 1 at a desired position. Then, by pressing an arbitrary position of the operation portion 18 of the handle portion 16 in the outer cylinder direction, the contact portion 17 rotates in the outer cylinder direction with the hinge portion 15 as the center. Along with this, the plunger 36 (and the gasket 35) moves toward the outer cylinder, and the chemical solution 37 filled in the syringe 3 is discharged from the nozzle portion 33.

FIG. 10 shows a state in which the contact portion 17 is located directly below the hinge portion 15 (specifically, vertically below) while the plunger pressing tool 1 is being operated (while the plunger 36 is being pressed). It is shown. At this time, the contact portion 17 of the handle portion 16 is an extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13 (the extension line of the central axis of the syringe mounting portion 13 also substantially coincides with this). : Located below A2. That is, the contact portion 17 when it is located directly below the hinge portion 15 is located slightly below the extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13: A2.

Here, the extension line of the central axis of the contact portion 17 and the outer cylinder 31: the distance between A2: D3 is 1/2 or less of the inner diameter of the outer cylinder 31 (the radius of the rear end of the lumen of the outer cylinder 31 or less) It has become. In other words, from the state shown in FIG. 1 to the state shown in FIG. 10 and further to the state shown in FIG. 11, the contact portion 17 is substantially below the extension line of the central axis of the outer cylinder 31 and below the outer cylinder. It moves within a range corresponding to 1/2 of the inner diameter of 31.

FIG. 11 shows the state when the operation of the plunger pressing tool 1 is completed (when the pressing of the plunger 36 is completed). At this time, the closing portion 35b of the gasket 35 attached to the tip of the plunger 36 comes into contact with the inner surface of the tip of the outer cylinder 31, so that the movement of the plunger 36 in the outer cylinder direction is completed and the syringe 3 is filled. The chemical solution 37 has been completely discharged.

Further, at this time, the front surface of the operation portion 18 of the handle portion 16 is close to the rear surface of the grip portion 12 so as to be in contact with or slightly separated from the rear surface. In some cases, the handle portion 16 and the grip portion 12 are configured to come into contact with each other before the closing portion 35b of the gasket 35 comes into contact with the inner surface of the tip of the outer cylinder 31, and the operation of the plunger pressing tool 1 is completed. It may be specified.

In the present embodiment, as shown in FIG. 11, the contact portion 17 (linear top portion 17c) during operation of the plunger pressing tool 1 (the handle portion 16 at the start of operation is shown by a broken line in FIG. 11). Trajectory: T is a part of an arc centered on the hinge portion 15 (rotation axis: A1). Here, the locus: T focused on the vertical direction takes the highest position at the start of the operation (FIG. 1) and the lowest position at the position directly below the hinge portion 15 (FIG. 10). In the vertical direction, it is within the range corresponding to 1/2 of the inner diameter of the outer cylinder 31. With such a configuration, the pressing force can be uniformly applied to the plunger 36 in the direction of the central axis of the outer cylinder 31. That is, in the present invention, it is preferable that the locus: T of the contact portion 17 during the operation of the plunger pressing tool 1 is within a range corresponding to 1/2 of the inner diameter of the outer cylinder 31 in the vertical direction. Further, it is more preferable that the locus: T is within a range of 30% or less of the inner diameter from the extension line of the central axis of the outer cylinder 31: A2.

Here, it can be said that the plunger pressing tool 1 of the present invention has a so-called "type 2 lever" structure. That is, the point of action (contact portion 17) and the point of effort (operation unit 18) are located in the same direction in that order when viewed from the fulcrum [hinge portion 15 (rotation axis: A1)], and the direction of the force at the point of effort. And the direction of the force at the point of action match. Therefore, there is little discomfort with respect to the operation of pressing the plunger 36 of the syringe 3 filled with the chemical solution 37, which requires extremely high precision.

On the other hand, for example, the plunger pressing tool disclosed in Patent Document 1 and the like described above has a so-called "first-class lever" structure in which the point of action and the point of effort are located on opposite sides of the fulcrum. Therefore, the direction of the force at the point of effort and the direction of the force at the point of action are reversed, which may cause a sense of discomfort.

In the plunger pressing tool 1 of the present embodiment, the handle portion 16 has a contact portion 17 (linear top portion 17c) capable of contacting the pressing portion 36b provided at the rear end portion of the plunger 36, and the contact portion. The operation portion 18 extending below the 17 is provided, and the distance between the contact portion 17 and the lower end of the operation portion 18: D2 is longer than the distance between the rotation axis of the hinge portion 15: A1 and the contact portion 17: D1. Further, the contact portion 17 is rotatable around the hinge portion 15 (rotational shaft: A1) in the direction of the outer cylinder mounted on the syringe mounting portion 13.

In such a configuration, the operating portion 18 is pressed so that the contact portion 17 rotates in the outer cylinder direction, thereby pressing the plunger 36 in contact with the contact portion 17 in the outer cylinder direction with a smaller force. can do. In other words, the pressing resistance of the plunger 36 can be reduced. Further, since the pressing direction of the operation unit 18 and the pressing (moving) direction of the plunger 36 match, the operability is good. Further, in the operation unit 18, the pressing resistance can be adjusted to a desired degree by the operator arbitrarily selecting the pressing position. In addition, during pressing of the plunger 36, the distance between the fulcrum (hinge portion 15 (rotation axis: A1)) and the point of action (contact portion between the contact portion 17 and the pressing portion 36b of the plunger 36): D1 Is maintained substantially constant, so that a change in resistance during pressing of the plunger 36 can be suppressed.

Further, the contact portion 17 when located directly below the hinge portion 15 is located on or slightly below the extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13. Therefore, the point of action (the contact portion between the contact portion 17 and the pressing portion 36b of the plunger 36) over the entire range during pressing of the plunger 36 is an extension line of the central axis of the outer cylinder 31 in the vertical direction: A2. The amount of deviation is as small as possible. Therefore, the pressing force can be applied to the plunger 36 substantially uniformly in the direction of the central axis of the outer cylinder.

In the plunger pressing tool 1 of the present embodiment, the contact portion 17 when located directly below the hinge portion 15 is an extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13, slightly below A2. The contact portion 17 is located at, and crosses the extension line of the central axis of the outer cylinder 31: A2 by moving from the position directly below the hinge portion 15 in the direction away from the outer cylinder. Therefore, the amount of action point (contact portion between the contact portion 17 and the pressing portion 36b of the plunger 36) deviates from the extension line of the central axis of the outer cylinder 31: A2 over the entire range during pressing of the plunger 36. But becomes smaller. Therefore, the pressing force can be uniformly applied to the plunger 36 in the direction of the central axis of the outer cylinder. The length of the linear apex 17c is preferably longer than the longest horizontal portion of the pressing portion 36b of the plunger of the syringe used, specifically, longer than the diameter of the pressing portion 36b of the plunger.

Further, in the plunger pressing tool 1 of the present embodiment, the contact portion 17 includes a linear top portion 17c extending substantially parallel to the rotation axis of the hinge portion 15: A1, and the linear top portion 17c is the plunger. It abuts linearly with the pressing portion 36b of 36. Therefore, it is possible to avoid applying excessive stress to the abutting portion as compared with the case where the abutting portion 17 and the pressing portion 36b abut at one point. Further, since the distance between the fulcrum (rotation axis of the hinge portion 15: A1) and the point of action (linear apex 17c) does not change over the entire range during pressing of the plunger 36, the change in pressing resistance is further suppressed. Will be done.

Further, in the plunger pressing tool 1 of the present embodiment, the distance between the contact portion 17 and the lower end of the operation portion 18 is longer than the distance between the rotation axis of the hinge portion 15: A1 and the contact portion 17, and is about 4. It is doubled. Therefore, the pressing resistance can be adjusted to a desired degree by the operator arbitrarily selecting the pressing position in the operation unit 18, and in particular, the pressing resistance can be sufficiently reduced.

Next, a case where the handle portion 16 is rotated from the outer cylinder 31 in the separation direction will be described.
In FIG. 12, the handle portion 16 of the plunger pressing tool 1 is rotated in the direction away from the outer cylinder 31, and the entire handle portion 16 is an extension of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13. The state of moving above A2 is shown. That is, the plunger pressing tool 1 can move the handle portion 16 upward from the extension line of the central axis of the outer cylinder 31: A2 by rotating the handle portion 16 in the direction away from the outer cylinder 31. In other words, in the plunger pressing tool 1, the interference avoidance cutout portion 20 includes the handle portion 16 and the extension portion 14 until the handle portion 16 moves upward from the extension line of the central axis of the outer cylinder 31: A2. Is formed in a size that does not interfere with each other. In such a state, the rear portion (pressing portion 36b) of the plunger 36 is exposed in a state in which the operator can press the plunger 36, and the operator can perform the plunger 36 as indicated by a white arrow: F in the drawing. Can be pressed directly. Therefore, even during the pressing operation of the plunger 36 described above, the operator can directly press the plunger 36 at an arbitrary timing.

In the state shown in FIG. 13, the plunger pressing tool 1 has a locking recesses 14a and 14a formed in the extending portion 14 and a locking convex portion 19a formed in the two arm portions 19 of the handle portion 16. By fitting with 19a, it is temporarily impossible to rotate the handle portion 16. That is, in the present embodiment, the locking concave portion 14a and the locking convex portion 19a cause the entire handle portion 16 to be above the extension line of the central axis of the outer cylinder 31: A2 (here, the upper portion of the extending portion 14). A stopper mechanism is configured to temporarily hold the handle portion 16 non-rotatably in the moved state. As a result, the handle portion 16 is rotated in the direction away from the outer cylinder 31 to a desired position above the extension line of the central axis of the outer cylinder 31: A2, and then the operator directly moves the plunger 36 from the rear. When pressing, it is not necessary to hold the handle portion 16 at the position, and the pressing of the plunger 36 can be concentrated.

In each of the above embodiments, a stopper that temporarily holds the handle portion 16 non-rotatably in one state in which the entire handle portion 16 is moved upward from the extension line of the central axis of the outer cylinder 31: A2. It was decided to have a mechanism, but it is not limited to this. For example, a plurality of locking concave portions 14a and locking convex portions 19a are provided in the rotation direction of the handle portion 16, and the entire handle portion 16 is moved above the extension line of the central axis of the outer cylinder: A2 (FIG. 12). In addition to holding in (corresponding to the first stage), the entire handle portion 16 may be held in a state of being moved to the upper part of the extending portion 14 (corresponding to FIG. 13) (second stage holding).

Further, the stopper mechanism is not limited to the one using the locking concave portion 14a and the locking convex portion 19a, and a known mechanism such as one using a support rod can be appropriately used.

In each of the above embodiments, in order to avoid interference between the handle portion 16 and the extension portion 14 when the handle portion 16 is rotated in the direction away from the outer cylinder 31, an interference avoidance cutout portion is provided in the handle portion 16. 20 was provided, but this may be provided in the extension portion 14. For example, the rear side portion of the extension portion 14 may be composed of two arm portions, and a notch portion into which the handle portion 16 (the upper end portion) can enter may be provided between the two arm portions.

Further, the syringe 3 is not limited to the one inserted and mounted from the rear of the plunger pressing tool 1 (syringe mounting portion 13). For example, a predetermined opening is provided on the side portion of the syringe mounting portion 13 and the syringe 3 is inserted from there. It may be attached.

Further, the plunger pressing tool of the present invention may be the plunger pressing tool 1a as shown in FIGS. 14 to 17.

The difference between the plunger pressing tool 1a of this embodiment and the plunger pressing tool 1 described above is only the position of the contact portion 17 on the handle portion 16, and the other portions have almost the same configuration. Specifically, in the plunger pressing tool 1a of this embodiment, the distance between the rotation axis of the hinge portion 15: A1 and the contact portion 17 (linear top 17c) is the plunger pressing tool of the previous embodiment. It is shorter than the case of 1. Hereinafter, regarding the plunger pressing tool 1a, the same reference numerals are given to the configurations common to the plunger pressing tool 1 of the previous embodiment, and the description thereof is omitted, and only the configurations related to the difference in the position of the contact portion 17 are given. ,explain.

The plunger pressing tool 1a is in the state shown in FIG. 14 [a state in which the contact portion 17 (linear top 17c) is brought into contact with the rear end portion (pressing portion 36b) of the plunger 36 before the pressing operation of the plunger 36. ], The contact portion 17 is located above the extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13: A2.

In the plunger pressing tool 1a, the contact portion 17 (linear top portion 17c) is rotatable around the hinge portion 15 in the direction of the outer cylinder 31 mounted on the syringe mounting portion 13, and is shown in FIG. As shown, the contact portion 17 when located directly below the hinge portion 15 is located below the extension line: A2 of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13.

The action of operating the plunger pressing tool 1a (when pressing the plunger 36) will be described with reference to FIGS. 14, 15, and 16.

FIG. 14 shows the state at the start of operation of the plunger pressing tool 1a (at the start of pressing the plunger 36). At this time, the contact portion 17 (linear top portion 17c) of the handle portion 16 is in contact with the pressing portion 36b of the plunger 36. Here, the contact portion 17 (the contact portion between the linear top portion 17c and the pressing portion 36b) is located above the extension line of the central axis of the outer cylinder 31: A2 in the vertical direction.

FIG. 15 shows a state in which the contact portion 17 is located directly below the hinge portion 15 (specifically, vertically below) while the plunger pressing tool 1a is being operated (while the plunger 36 is being pressed). It is shown. At this time, the contact portion 17 of the handle portion 16 is an extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13 (the extension line of the central axis of the syringe mounting portion 13 also substantially coincides with this). : Located slightly below A2.

FIG. 15 shows the locus of the contact portion 17 from the state shown in FIG. 14 to the state shown in FIG. 15, Ta1. As shown in the locus Ta1 of FIG. 15, the contact portion 17 crosses the extension line of the central axis of the outer cylinder 31: A2 between FIGS. 14 and 15. That is, the contact portion 17 when located directly below the hinge portion 15 is located slightly below the extension line: A2 of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13, and the contact portion 17 Is to cross the extension line of the central axis of the outer cylinder 31: A2 by moving it from the position directly below the hinge portion 15 in the direction away from the outer cylinder 31 (rearward).

FIG. 16 shows the state when the operation of the plunger pressing tool 1a is completed (when the pressing of the plunger 36 is completed). At this time, the contact portion 17 (the contact portion between the linear top portion 17c and the pressing portion 36b) is located slightly above the extension line of the central axis of the outer cylinder 31: A2 in the vertical direction.

In FIG. 16, the locus of the contact portion 17 during the operation of the plunger pressing tool 1: As shown in Ta2, the contact portion 17 is moved from the position directly below the hinge portion 15 toward the outer cylinder (in the figure). , A point indicated by Y), which crosses the extension line of the central axis of the outer cylinder 31: A2. That is, the contact portion 17 when located directly below the hinge portion 15 is located slightly below the extension line: A2 of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13, and the contact portion 17 Crosses the extension line of the central axis of the outer cylinder 31: A2 by moving in the outer cylinder direction (forward) from the position directly below the hinge portion 15.

The locus of the contact portion 17 (linear top 17c) throughout the operation of the plunger pressing tool 1a: Ta (the above-mentioned locus: Ta1 and locus: Ta2 are combined) is shown in FIG. As shown in FIG. 17, the contact portion 17 when located directly below the hinge portion 15 is located slightly below the extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13: A2. Further, the contact portion 17 crosses the extension line of the central axis of the outer cylinder 31: A2 at the first point: X by moving from the position directly below the hinge portion 15 toward the outer cylinder. Further, the abutting portion 17 crosses the extension line of the central axis of the outer cylinder 31: A2 at the second point: Y by moving from the position directly below the hinge portion 15 in the direction away from the outer cylinder 31. Is. The distance between the first point: X and the second point: Y: L is preferably 5 to 100 mm, more preferably 20 to 70 mm.

In the plunger pressing tool 1a of this embodiment, the locus of the contact portion 17 (linear top 17c) throughout the operation of the plunger pressing tool 1a: Ta is the outer cylinder 31 mounted on the syringe mounting portion 13. Extension line of the central axis: Passing near A2, in other words, the distance between the contact portion 17 (linear top 17c) in the vertical direction and the extension line of the central axis of the outer cylinder 31: A2 is the operation of the plunger pressing tool 1a. Since it becomes smaller throughout the time, the pressing force can be applied to the plunger 36 in the direction of the central axis of the outer cylinder 31 even more uniformly.

Further, the plunger pressing tool of the present invention may be a plunger pressing tool 1b as shown in FIG. FIG. 18 shows the locus: t of the contact portion 17 (linear top portion 17c) throughout the operation of the plunger pressing tool 1b. Here, in the front-rear direction, the distance between the rotation axis of the contact portion 17 and the hinge portion 15 at the start of operation: A1 (the virtual line extending in the vertical direction through A1 in the figure: a): s1 and the hinge portion 15 The rotation axis: A1 (virtual line: a) and the distance between the contact portion 17 at the completion of the operation: s2 are equal. Further, here, in the vertical direction, the uppermost position of the contact portion 17 (position at the start and completion of the operation) and the extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13: the distance between A2: d1 is equal to the lowest position of the contact portion 17 (the position directly below the hinge portion 15) and the extension line of the central axis of the outer cylinder 31 mounted on the syringe mounting portion 13: the distance between A2: d2. ..

According to such a configuration, it is possible to make the pressing resistance uniform in the entire range when the plunger pressing tool 1b is operated. In order to realize such a configuration, it is conceivable not only to appropriately design the plunger presser, but also to appropriately select and design the syringe to be used.

Further, in each of the above embodiments, the contact portion 17 includes a linear top portion 17c, and the linear top portion 17c linearly contacts the pressing portion 36b of the plunger 36 during operation of the plunger pressing tool. I was in contact with them, but it is not limited to this. For example, as shown in FIG. 19, the contact portion 17 of the plunger pressing tool 1c includes a curved convex portion 17d, and the curved convex portion 17d is linear or at a certain point with the pressing portion 36b of the plunger 36. It may be in contact with each other. In this case, strictly speaking, during the operation of the plunger pressing tool 17c, the distance between the contact portion 17 (the contact portion between the curved convex portion 17d and the pressing portion 36b) and the hinge portion 15 changes slightly. , This does not bring about a big change in the pressing resistance felt by the operator.

The plunger pressing tool of the present invention is as follows.
(1) A plunger pressing tool for a syringe including an outer cylinder, a gasket slidably housed in the outer cylinder, and a plunger for moving the gasket.
The plunger pressing tool is provided on a grip portion having a syringe mounting portion on which the syringe can be mounted on the outer cylinder, an extending portion extending rearward from the upper portion of the grip portion, and a rear portion of the extending portion. A main body portion having a hinge portion and a handle portion rotatably held by the hinge portion are provided.
The handle portion includes a contact portion of the mounted syringe with respect to the rear end portion of the plunger, and an operation portion extending downward from the contact portion.
The handle portion can be rotated around the hinge portion in the direction of the outer cylinder mounted on the syringe mounting portion and in the direction away from the outer cylinder, and is rotated in the direction away from the outer cylinder. As a result, the plunger pressing tool is capable of moving the entire handle portion upward from the extension line of the central axis of the outer cylinder mounted on the syringe mounting portion.

In the plunger pressing tool of the present invention, the entire handle portion is mounted on the syringe mounting portion by rotating the handle portion in a direction away from the outer cylinder mounted on the syringe mounting portion around the hinge portion. It can be moved above the extension of the central axis of the cylinder. Therefore, at any time during the operation, the entire handle portion is moved above the extension line of the central axis of the outer cylinder mounted on the syringe mounting portion to expose the rear end portion of the plunger in a pressable state. be able to. As a result, the plunger can be directly pressed at any timing during the operation. Also, the syringe can be easily replaced.

Moreover, the above-mentioned embodiment may be as follows.
(2) The plunger pressing tool includes a stopper mechanism that temporarily holds the handle portion non-rotatably in a state where the entire handle portion is moved upward from the extension line of the central axis of the outer cylinder. The plunger pressing tool according to (1) above.
(3) The plunger pressing tool can move the entire handle portion to the upper part of the extension portion by rotating the handle portion in a direction away from the outer cylinder (1) or (2). ) Described in the plunger press.
(4) The plunger pressing tool according to any one of (1) to (3) above, wherein the contact portion includes a linear top portion extending substantially parallel to the central axis of the hinge portion.

Claims

A plunger press for a syringe including an outer cylinder, a gasket slidably housed in the outer cylinder, and a plunger for moving the gasket.
The plunger pressing tool is provided on a grip portion having a syringe mounting portion on which the syringe can be mounted on the outer cylinder, an extending portion extending rearward from the upper portion of the grip portion, and a rear portion of the extending portion. A main body portion having a hinge portion and a handle portion rotatably held by the hinge portion are provided.
The handle portion includes a contact portion of the mounted syringe with respect to the rear end portion of the plunger, and an operation portion extending downward from the contact portion.
The handle portion can be rotated around the hinge portion in the direction of the outer cylinder mounted on the syringe mounting portion and in the direction away from the outer cylinder, and is rotated in the direction away from the outer cylinder. As a result, the plunger pressing tool is characterized in that the entire handle portion can be moved upward from the extension line of the central axis of the outer cylinder mounted on the syringe mounting portion.
The plunger pressing tool is provided with a stopper mechanism for temporarily holding the handle portion so as to be temporarily non-rotatable in a state where the entire handle portion is moved upward from the extension line of the central axis of the outer cylinder. Plunger presser described in.
The plunger pressing tool according to claim 1 or 2, wherein the entire handle portion can be moved to the upper portion of the extension portion by rotating the handle portion in a direction away from the outer cylinder. Plunger presser.
The plunger pressing tool according to any one of claims 1 to 3, wherein the contact portion includes a linear top portion extending substantially parallel to the central axis of the hinge portion.