JPWO2014208446A1 - Syringe and flowable material transfer device - Google Patents

Abstract

[PROBLEMS] To improve both liquid-tightness and operability in a syringe for transferring a fluid substance and a fluid substance transfer tool. The plunger has a plunger main body and a plunger head that is integrally provided at the tip of the plunger main body and slides while maintaining liquid tightness with respect to the inner wall surface of the outer cylinder. When the plunger is pulled compared to when the plunger is pressed against the inner peripheral wall of the outer cylinder in the state where the plunger is inserted into the outer cylinder at the peripheral edge of the plunger head. Further, an annular elastic piece whose resistance value with respect to the inner wall surface of the outer cylinder decreases is extended forward. Thereby, when reciprocating the plunger, both the liquid-tightness and the operability of the syringe can be improved even when the force of pulling the plunger is weaker than the force of pushing the plunger.

Description

  The present invention relates to a syringe and a flowable substance transfer device suitable for transferring and administering a flowable substance such as a preparation or a drug solution from a container to a patient administration site (for example, a fistula).

  Conventionally, as this type of syringe, a syringe composed of an outer cylinder (cylinder) that contains a fluid substance and a plunger (that is, a piston) that is removably inserted into the outer cylinder has been proposed. (For example, refer to Patent Document 1).

  In this syringe, a flexible collar is formed on the plunger head in a lateral direction (that is, a direction perpendicular to the direction in which the plunger reciprocates). In order to obtain a predetermined liquid tightness, the outer diameter of the collar is slightly larger than the inner diameter of the outer cylinder so that the collar is brought into close contact with the outer cylinder, and predetermined operability (that is, ease of sliding). In order to obtain this, this buttock is formed thin.

Japanese Patent Laid-Open No. 2002-726

  In such a syringe, since the flange portion of the plunger head is provided sideways, the friction coefficient of the contact surface between the inner wall surface of the outer cylinder and the flange portion is different between when the plunger is pulled and when the plunger is pushed. It is considered to be the same level.

  However, the user may have a weaker pulling force than the pushing force of the plunger. In such a case, the operability for the user is better when the force required when pulling the plunger is smaller than the force required when pushing the plunger.

  Further, in order to improve the liquid tightness of the contact portion between the plunger head and the inner cylinder inner wall surface (that is, to prevent the fluid substance from leaking out from the contact portion), the plunger head and the outer tube. It is desirable to make the contact pressure with the inner wall sufficiently high. However, the higher the contact pressure, the greater the force required for the user when pushing or pulling the plunger, and the operability deteriorates.

  In view of such circumstances, the present invention requires less force to pull the plunger than the force to push the plunger when reciprocating the plunger, and is excellent in both liquid tightness and operability. It is a first object to provide a syringe. A second object is to provide a flowable substance transfer device including such a syringe.

  In order to achieve this object, in the syringe according to the present invention, a plunger is reciprocally inserted in an outer cylinder containing a flowable substance, and the plunger is pulled to move the outer cylinder from the outside to the inside. A syringe that sucks a fluid substance and pushes the fluid substance from the inside of the outer cylinder to the outside by pushing the plunger, and the plunger is integrated with a plunger body and a tip of the plunger body. A plunger head that slides while maintaining liquid tightness with respect to the inner wall surface of the outer cylinder, and the plunger is inserted into the outer cylinder at a peripheral edge of the tip of the plunger head. When the plunger is pulled, the resistance against the inner wall surface of the outer cylinder is elastically contacted with the inner wall surface of the outer cylinder when worn and compared with when the plunger is pushed. There elastic piece of decreasing annular characterized in that it extends toward the front.

  In the syringe of the present invention, when the plunger is pulled, the pressure in the outer cylinder is reduced, and the contact pressure between the elastic piece and the inner wall surface of the outer cylinder is reduced. When the plunger is pushed, the pressure in the outer cylinder rises, and the contact pressure between the elastic piece and the inner wall surface of the outer cylinder increases, so that the liquid tightness is increased. It is desirable to be configured to increase.

  In the syringe of the present invention, it is preferable that the elastic piece is provided outside the groove by forming a groove having a predetermined shape at the peripheral edge of the tip of the plunger head.

  In the syringe of the present invention, it is desirable that the groove has a substantially V-shaped cross section.

  In the syringe of the present invention, it is desirable that the elastic piece has an abutting portion that substantially linearly contacts the inner wall surface of the outer cylinder in a state where the plunger is inserted into the outer cylinder.

  In the syringe of the present invention, the elastic piece is formed behind the contact portion and the contact portion, has a smaller diameter than the corresponding contact portion, and an outer peripheral surface is curved along the longitudinal direction of the plunger. It is desirable to include a curved surface portion and an inclined surface formed in front of the contact portion, having a smaller diameter than the corresponding contact portion, and having an outer peripheral surface inclined along the longitudinal direction of the plunger.

  In the syringe of the present invention, the fluid substance can be a preparation.

  The flowable substance transfer device of the present invention contains a flowable substance attached to a three-way valve, a syringe connected to the first branch flow path of the three-way valve, and a second branch flow path of the three-way valve. And a connecting pipe connected to the third branch flow path of the three-way valve, and the syringe has a plunger reciprocally inserted in an outer cylinder containing a fluid substance. The fluid substance is sucked from the outside to the inside of the outer cylinder by pulling the plunger, and the fluid substance is pushed out from the inside of the outer cylinder by pushing the plunger. The plunger includes a plunger main body and a plunger head that is integrally provided at a tip of the plunger main body and slides while maintaining liquid tightness with respect to an inner wall surface of the outer cylinder, Plunger head tip When the plunger is pulled to the edge portion, the plunger is elastically contacted with the inner wall surface of the outer cylinder in a state where the plunger is inserted into the outer cylinder, and compared to when the plunger is pressed. Further, an annular elastic piece whose resistance value with respect to the inner wall surface of the outer cylinder decreases is extended forward.

  According to the syringe of the present invention, the elastic piece extends forward at the distal end peripheral portion of the plunger head, and when the plunger is pulled compared to when the plunger is pushed, The resistance value of the elastic piece with respect to the inner wall surface decreases. As a result, it is possible to provide a syringe capable of achieving both liquid-tightness and operability even when the plunger pulling force is weaker than the plunger pushing force when the plunger is reciprocated. Can do.

  The syringe of the present invention is configured such that when the plunger is pulled, the contact pressure with the inner wall surface of the outer cylinder decreases, and when the plunger is pressed, the contact pressure increases. Both adhesion and adhesion can be improved.

  In the syringe of the present invention, the elastic piece can be easily formed by forming a groove having a predetermined shape in the peripheral edge of the tip of the plunger head.

  In the syringe of the present invention, by making the cross section of the groove substantially V-shaped, it becomes easy to sufficiently increase the decrease or increase in contact pressure as described above.

  In the syringe according to the present invention, since the elastic piece of the plunger head and the inner wall surface of the outer cylinder are substantially in line contact with each other, the contact area between the two is reduced compared to the case of surface contact. Not only can the resistance value of the elastic piece to be suppressed, but also by increasing the contact pressure per unit area of both, the liquid tightness of the syringe can be improved.

  In the syringe of the present invention, by providing the elastic piece with the curved surface portion and the inclined surface portion, the frictional resistance of the contact portion can be sufficiently reduced.

  In the syringe of the present invention, by using a fluid substance as a preparation, a preparation administration syringe having the above-described effects can be obtained.

  According to the flowable substance transfer device of the present invention, it is possible to provide a flowable material transfer device provided with a syringe having the above-described effects.

It is a front view which shows the fluid substance transfer tool which concerns on Embodiment 1 of this invention. It is a figure which shows the plunger of the syringe of the fluid substance transfer tool which concerns on the same Embodiment 1, Comprising: (a) is the front view, (b) is the left view. FIG. 3 is an enlarged detail view showing an example of a cross-sectional shape of the plunger according to the first embodiment. FIG. 3 is an enlarged detail view showing an example of a cross-sectional shape of the plunger according to the first embodiment. FIG. 3 is an enlarged detail view showing an example of a cross-sectional shape of the plunger according to the first embodiment. FIG. 3 is an enlarged detail view showing an example of a cross-sectional shape of the plunger according to the first embodiment. It is a bar graph which shows the relationship between the depth of the groove | channel of the plunger which concerns on the same Embodiment 1, and resistance value when pulling a plunger. It is a bar graph which shows the relationship between the depth of the groove | channel of the plunger which concerns on the same Embodiment 1, and resistance value when pushing a plunger.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention
1 to 4B show Embodiment 1 of the present invention. 3A to 4D are all enlarged cross-sectional views taken along the line CC of the plunger head shown in FIG.

  As shown in FIG. 1, a fluid substance transfer device 1 according to Embodiment 1 is connected to a container 2 in which a preparation is stored, and this preparation is transferred from the container 2 to a patient's administration site for administration. Used to do. This fluid substance transfer device 1 includes a three-way valve 4 made of a transparent synthetic resin having a structure in which the first to third branch passages 41, 42, and 43 join together in a T-shape at the joining portion 44, and the three-way valve. 4, the syringe 3 connected in communication with the first branch flow path 41, the container connecting portion 5 attached to the second branch flow path 42 of the three-way valve 4, and the third branch flow of the three-way valve 4. And a connection pipe 6 connected in communication with the path 43.

  Here, in the second branch flow path 42 of the three-way valve 4, as shown in FIG. 1, the first check valve 10 flows from the container 2 to the junction 44 (flow upward in FIG. 1). ) And the reverse flow (downward flow in FIG. 1) is prevented. Further, in the third branch flow path 43 of the three-way valve 4, the second check valve 11 allows a flow from the joining portion 44 to the connecting pipe 6 (flow to the left in FIG. 1) and reversely. It is attached so as to prevent the flow in the direction (flow to the right in FIG. 1).

  Further, as shown in FIG. 1, the syringe 3 has a substantially cylindrical transparent synthetic resin outer cylinder 31 that accommodates the preparation. The outer cylinder 31 is a first branch flow of the three-way valve 4. It is formed integrally with the path 41. A polyethylene plunger 32 is inserted into the outer cylinder 31 so as to be capable of reciprocating in the tube center direction of the outer cylinder 31 (directions of arrows A and B). Then, by pulling the plunger 32, the preparation is sucked from the outside of the outer cylinder 31 (the three-way valve 4 side) into the outer cylinder 31, and by pushing the plunger 32, the outer cylinder 31 is moved from the inside of the outer cylinder 31. It is comprised so that a formulation can be extruded to the exterior (three-way valve 4 side).

  As shown in FIG. 2, the plunger 32 has a plunger main body 33 and a plunger head 34. The plunger body 33 is formed in a columnar shape having a substantially cross-shaped cross section. The plunger head 34 is formed in a substantially disk shape, is provided integrally with the tip of the plunger body 33, and slides while maintaining liquid tightness with respect to the inner wall surface 31 a of the outer cylinder 31.

  Here, in the distal end peripheral portion 34a of the plunger head portion 34, as shown in FIG. 2B and FIGS. 3A to 3D, an annular groove V having a V-shaped cross section is provided so as to face the branch flow path 41. Is formed. Thereby, an annular elastic piece 35 is formed on the outer peripheral side of the groove 36. As will be described later, the plunger head 34 shown in FIGS. 3A to 3D has different depths D (see FIG. 3A).

  As shown in FIGS. 3A to 3D, the elastic piece 35 includes a contact portion 35a, a curved surface portion 35b, and an inclined surface portion 35c. The abutting portion 35a is in substantially line contact with the inner wall surface 31a of the outer cylinder 31 in an annular shape. The curved surface portion 35b is provided behind the contact portion 35a (that is, on the plunger main body 33 side), has a smaller diameter than the contact portion 35a, and has an outer peripheral surface indicated by the longitudinal direction of the plunger 32 (A and B). Curved in the direction of travel). The inclined surface portion 35 c is provided in front of the contact portion 31 a (that is, on the branch flow path 41 side), has a smaller diameter than the contact portion 35 a, and an outer peripheral surface along the longitudinal direction of the plunger 32. Inclined. With such a configuration, the friction coefficient of the contact portion 35a can be kept sufficiently low (described later). In the state where the plunger 32 is not inserted into the outer cylinder 31, the elastic piece 35 is slightly smaller than the state where the plunger 32 is inserted into the outer cylinder 31, as indicated by the imaginary line in FIG. It is in the open state on the outside.

  As the size of the elastic piece 35, the width of the elastic piece 35 is set to 4.7 to 5.6% of the diameter of the plunger head 34 from the viewpoint of ensuring the strength and liquid tightness, and the height of the elastic piece 35 is set. Is preferably 39.6 to 63.0% of the thickness of the plunger head 34.

  Since the fluid substance transfer device 1 has the above-described configuration, it is possible to transfer and administer the preparation from the container 2 to the administration site of the patient using the fluid substance transfer device 1 according to the following procedure. it can.

  First, in the preparation step, the container connecting portion 5 of the fluid substance transfer device 1 is connected to the storage container 2 in which the preparation is stored. Further, the connecting pipe 6 of the fluid substance transfer device 1 is connected to the administration site of the patient.

  Next, the process proceeds to the transfer execution process. In this transfer execution step, first, the user pulls the plunger 32 of the syringe 3 (that is, moves the plunger 32 in the direction B of FIG. 3A). Thereby, the inside of the storage container 2 and the inside of the three-way valve 4 become negative pressure (that is, the pressure lower than the atmospheric pressure), and the preparation in the storage container 2 passes through the first check valve 10 and the three-way valve 4. Then, it is sucked into the syringe 3 (that is, inside the outer cylinder 31).

  Here, since the plunger head 34 is provided with an annular groove 36 having a substantially V-shaped cross section, when the inside of the container 2 becomes negative pressure, the elastic piece 35 moves in the inner direction (that is, in the groove 36. Receives force in the direction of narrowing). For this reason, the contact pressure of the portion where the contact portion 35a of the elastic piece 35 and the inner wall surface 31a of the outer cylinder 31 are in contact with each other is reduced, and the friction coefficient of the contact portion is reduced.

  As a result, the force required when the user pulls the plunger 32 is reduced. In addition, when the contact pressure between the contact portion 35a and the inner wall surface 31a decreases, the liquid tightness at the contact portion decreases. However, at this time, the inside of the container 2 and the inside of the three-way valve 4 are in a negative pressure, so there is no possibility that the preparation leaks from this contact portion.

  When a desired amount of the preparation is contained in the three-way valve 4 and the syringe 3, the user subsequently pushes the plunger 32 of the syringe 3 (ie, moves the plunger 32 in the direction A of FIG. 3A). . Thereby, the inside of the three-way valve 4 and the inside of the syringe 3 become a positive pressure (that is, an atmospheric pressure higher than the atmospheric pressure), and the preparation contained in the syringe 3 is pushed out from the outer cylinder 31, and the three-way valve 4, It is transferred to the administration site of the patient via the second check valve 11 and the connecting pipe 6.

  At this time, the preparation in the container 2 enters the groove 36, and the elastic piece 35 receives a force in the outer direction (that is, the direction in which the width of the groove 36 increases). For this reason, the contact pressure of the portion where the contact portion 35a of the elastic piece 35 and the inner wall surface 31a of the outer cylinder 31 are in contact increases, and the friction coefficient of the contact portion increases. As a result, the force required when the user pushes the plunger 32 becomes larger than when the plunger 32 is pulled. Further, since the contact pressure between the contact portion 35a and the inner wall surface 31a is increased, the liquid tightness at the contact portion is improved, so that it is difficult for the preparation to leak from the contact portion.

  Further, as described above, in the syringe 3, with the plunger 32 inserted in the outer cylinder 31, the abutting portion 35 a of the elastic piece 35 is substantially in line contact with the inner wall surface 31 a of the outer cylinder 31. Yes. Therefore, compared with the case where the contact portion 35a of the elastic piece 35 is in surface contact with the inner wall surface 31a of the outer cylinder 31, the contact area between the two (the inner wall surface 31a of the outer cylinder 31 and the contact portion 35a of the elastic piece 35) is larger. Since it decreases, the resistance value of the elastic piece 35 with respect to the inner wall surface 31a of the outer cylinder 31 can be suppressed. In addition, the liquid tightness of the syringe 3 can be improved by increasing the contact pressure per unit area of both. In addition, since the position of the abutting portion 35A is on the distal end side of the elastic piece 35, the position where the plunger 32 is closest to the branch flow path 41 as compared with the case where this position is on the rear end side of the elastic piece 35. The residual amount of the preparation remaining in the outer cylinder 31 when moved can be reduced.

  Further, as described above, since the elastic piece 35 is provided by forming the groove 36 in the distal end peripheral portion 34a of the plunger head 34, the plunger 32 has moved to the position where the plunger 32 is closest to the branch flow path 41. Sometimes, even if the elastic piece 35 hits the bottom of the outer cylinder 31, it is not easily damaged, and the residual amount of the preparation remaining in the outer cylinder 31 can be kept small (an amount approximately equal to the volume of the groove 36). Moreover, since the groove 36 has a substantially V-shaped cross section, the resistance of the elastic piece 35 to the inner wall surface 31a of the outer cylinder 31 when the plunger 32 is pushed and the elastic piece 35 receives an external force in the direction of opening outward. It becomes easy to work the effect that the value increases.

  As described above, since the first and second check valves 10 and 11 are appropriately attached to the second and third branch flow paths 42 and 43 in the three-way valve 4, this transfer execution step. Therefore, the situation where the preparation transferred from the container 2 into the outer cylinder 31 of the syringe 3 flows back to the container 2 does not occur, and the preparation can be transferred smoothly.

  In order to confirm the above-described effect, a substantially V-shaped cross-sectional circle is formed on the distal end peripheral portion 34a of the substantially disc-shaped plunger head 34 having a diameter of 15.3 mm and a thickness of 2.3 mm, as shown in FIGS. 3A to 3D. The annular groove 36 was formed with four types of depths D (D = 1.51 mm, 1.25 mm, 0.92 mm, 0.61 mm), and four types of polyethylene plungers 32 were made as prototypes.

  And about these four types of prototypes 1-4, when there is no formulation (when air is contained in the container 2) and when there is a formulation (when a predetermined formulation in the container 2 is accommodated), respectively. When the plunger 32 was pulled, it was examined how the resistance value of the elastic piece 35 against the inner wall surface 31a of the outer cylinder 31 changes. The results are shown as a bar graph in FIG. 4A. In this bar graph, the vertical axis represents the resistance value (unit: Newton). As is clear from FIG. 4A, regarding the relationship between the resistance value when the plunger 32 is pulled and the depth D of the groove 36, the shallower the groove 36, regardless of whether the preparation is not present or not. It was recognized that the resistance value when the plunger 32 was pulled tends to increase.

  In addition, for these four types of prototypes 1 to 4, respectively, when there is no formulation (when air is contained in the container 2) and when there is a formulation (when the predetermined formulation in the container 2 is accommodated), It was examined how the resistance value of the elastic piece 35 with respect to the inner wall surface 31a of the outer cylinder 31 changes when the plunger 32 is pushed. The results are shown as a bar graph in FIG. 4B. In this bar graph, the vertical axis represents the resistance value (unit: Newton). As is clear from FIG. 4B, regarding the relationship between the resistance value when the plunger 32 is pushed and the depth D of the groove 36, the shallower the groove 36, regardless of whether the preparation is not present or not. It was recognized that the resistance value when the plunger 32 was pushed tends to increase.

  4A and 4B, it is clear that when the plunger 32 is subtracted from the resistance value when the plunger 32 is pushed, particularly in the case of the preparations, in any of the prototypes 1 to 4 The resistance value has decreased. That is, when the plunger 32 is reciprocated, the liquid tightness and the operability of the syringe 3 can be made compatible even when the force of pulling the plunger 32 is weaker than the force by which the user pushes the plunger 32. The result which proves that can be done was obtained.

[Other Embodiments of the Invention]
In the first embodiment described above, the fluid substance transfer device 1 in which the three-way valve 4 and the outer cylinder 31 of the syringe 3 are integrally formed has been described. However, the present invention can be similarly applied to the fluid substance transfer device 1 in which the three-way valve 4 and the outer cylinder 31 of the syringe 3 are separately provided. Furthermore, it is also possible to apply the present invention to the flowable material transfer device 1 that does not include the three-way valve 4.

  Further, in the first embodiment described above, the plunger 32 in which the groove 36 having a substantially V-shaped annular ring is formed in the distal end peripheral portion 34a of the plunger head 34 has been described. However, the shape of the groove 36 is not necessarily an annular shape having a substantially V-shaped cross section. As long as a predetermined elastic piece 35 is provided on the distal end peripheral portion 34a of the plunger head 34, the groove having a substantially V-shaped annular shape is provided. Grooves other than 36 (for example, a groove having a substantially U-shaped cross section, a groove having a substantially L-shaped cross section, a groove having a substantially I-shaped cross section, etc.) may be formed.

  Moreover, in Embodiment 1 mentioned above, the plunger 32 made from polyethylene was demonstrated. However, the material of the plunger 32 is not limited to polyethylene, and other synthetic resins such as polypropylene, polycarbonate, polyamide, and polyethylene terephthalate can be used. Furthermore, materials other than synthetic resin (for example, metal, glass, etc.) may be substituted.

  In the first embodiment described above, a lubricant such as lubricating oil or grease is applied to the inner wall surface 31 a of the outer cylinder 31 in order to reduce the frictional resistance value of the elastic piece 35 against the inner wall surface 31 a of the outer cylinder 31. Needless to say.

  Moreover, in Embodiment 1 mentioned above, the syringe 3 used for the fluid substance transfer tool 1 was demonstrated. However, the present invention can be similarly applied to a syringe 3 used in an instrument / device other than the fluid substance transfer tool 1 (for example, a syringe, a dispenser, an analytical instrument, etc.).

  Furthermore, although Embodiment 1 mentioned above demonstrated the case where the fluid substance handled with the fluid substance transfer tool 1 was a formulation, fluid substances other than a formulation (for example, nutritional composition, blood, adhesive, etc.) It is also possible to apply the present invention in the same way when handling

  The present invention can be widely applied to various industries including a step of transferring a fluid substance.

DESCRIPTION OF SYMBOLS 1 Fluid substance transfer tool 3 Syringe 31 Outer cylinder 31a Inner wall surface 32 Plunger 33 Plunger main body 34 Plunger head 34a Tip peripheral part 35 Elastic piece 35a Contact part 35b Curved surface part 35c Inclined surface part 36 Groove

Claims (8)

A plunger is removably inserted into an outer cylinder containing a fluid substance, and by pulling the plunger, the fluid substance is sucked from the outside to the inside of the outer cylinder, and the plunger is pushed. A syringe for extruding the fluid substance from the inside of the outer cylinder to the outside,
The plunger has a plunger main body and a plunger head that is integrally provided at a tip of the plunger main body and slides while maintaining liquid tightness with respect to the inner wall surface of the outer cylinder,
Compared to the case where the plunger is elastically contacted with the inner wall surface of the outer cylinder in a state where the plunger is inserted into the outer cylinder and the plunger is pushed, The syringe is characterized in that an annular elastic piece that extends in a forward direction and has a resistance value that decreases with respect to the inner wall surface of the outer cylinder when the plunger is pulled. When the plunger is pulled, the pressure in the outer cylinder is reduced, and the contact pressure between the elastic piece and the inner wall surface of the outer cylinder is reduced, thereby reducing the resistance value.
When the plunger is pushed, the pressure in the outer cylinder rises, and the contact pressure between the elastic piece and the inner wall surface of the outer cylinder increases, thereby increasing the liquid tightness.
The syringe according to claim 1, which is configured as described above.   The syringe according to claim 2, wherein the elastic piece is provided outside the groove by forming a groove having a predetermined shape in a peripheral edge portion of the tip of the plunger head.   The syringe according to claim 3, wherein the groove has a substantially V-shaped cross section.   The said elastic piece has the contact part which contact | connects the said inner wall surface of the said outer cylinder substantially linearly in the state by which the said plunger was inserted in the said outer cylinder, The said contact piece is characterized by the above-mentioned. Syringe. The elastic piece is
The contact portion;
A curved surface portion formed behind the contact portion, having a smaller diameter than the corresponding contact portion, and having an outer peripheral surface curved along the longitudinal direction of the plunger;
An inclined surface that is formed in front of the contact portion, has a smaller diameter than the corresponding contact portion, and an outer peripheral surface that is inclined along the longitudinal direction of the plunger;
The syringe according to claim 5, comprising:   The syringe according to any one of claims 1 to 6, wherein the fluid substance is a preparation. A three-way valve, a syringe connected to the first branch flow path of the three-way valve, and a container connecting part attached to a container containing a fluid substance attached to the second branch flow path of the three-way valve; A connecting pipe connected to the third branch flow path of the three-way valve,
The syringe is
A plunger is removably inserted into an outer cylinder containing a fluid substance, and by pulling the plunger, the fluid substance is sucked from the outside to the inside of the outer cylinder, and the plunger is pushed. , Configured to extrude the fluid substance from the inside of the outer cylinder to the outside,
The plunger has a plunger main body and a plunger head that is integrally provided at a tip of the plunger main body and slides while maintaining liquid tightness with respect to the inner wall surface of the outer cylinder,
Compared to the case where the plunger is elastically contacted with the inner wall surface of the outer cylinder in a state where the plunger is inserted into the outer cylinder and the plunger is pushed, A fluid substance transfer device, wherein an annular elastic piece whose resistance value against the inner wall surface of the outer cylinder decreases when the plunger is pulled is extended forward.

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