Liquid medicine administration device

Abstract

To provide a liquid medicine administration device coping with a small amount of rapid administration.SOLUTION: A liquid medicine administration device comprises: a reservoir comprising a flexible cylindrical body with an opening and a closed bottom part, and a base part for covering the opening of the flexible cylindrical body. The flexible cylindrical body 110 comprises: a fixing part 111 which is formed on the opening 131 side and fixed to the base part 150; a pressing disk part 113 which is formed on the bottom part 132 side and pressed by a plunger 202; and a peripheral wall part 112 forming an internal space 133. The internal space 133 is reduced in diameter from the fixing part 111 side to the pressing disk part 113 side, and has a narrow part between the pressing disk part and the peripheral wall part.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a drug solution administration device, and more particularly to a drug solution administration device having a one-shot rapid administration function. [Background technology]

[0002] One method of pain management is self-regulated analgesia, in which a patient is continuously administered small amounts of analgesic, and if the patient experiences sudden pain, the patient can operate the device themselves to immediately administer a safe and effective amount of analgesic.

[0003] When performing self-regulated analgesia, a drug solution administration device may be used that is provided with a reservoir in which a drug solution is slowly stored over a predetermined time and that can perform rapid administration by rapidly delivering the stored drug solution. Such a drug solution administration device has, for example, a reservoir having a flexible cylindrical body and an operation unit having a plunger that presses the cylindrical body. When the plunger is pushed in by the patient's operation, the cylindrical body of the reservoir is crushed and the drug solution in the reservoir is rapidly delivered. Once rapid administration is performed, the device is configured such that it cannot be operated again until the drug solution is stored in the reservoir again. In addition to the normal continuous administration, a predetermined amount of drug solution stored in the reservoir is rapidly administered by the patient's operation, but once the operation is performed, rapid administration is not possible until the drug solution is stored in the reservoir again over a predetermined time, so overadministration can be prevented (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-227144 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, there has been a trend to reduce the amount of medicinal liquid that can be rapidly administered in one operation. For this reason, there is a demand for reservoirs with smaller volumes. There is also a demand to be able to adjust the amount of medicinal liquid that can be rapidly administered depending on the situation. For this reason, there is also a demand for the shape and operability of the device not to change significantly even if the volume changes.

[0006] If the capacity of the reservoir is reduced by changing only the height of the cylindrical body without changing the inner diameter, the parts other than the reservoir can be made the same, so the shape and operability can be made almost the same even if the capacity is changed. However, if the height of the cylindrical body is reduced, the stroke of the plunger becomes shorter. This may prevent the patient from feeling that they have correctly operated the plunger to administer the rapid injection. There is also a risk that the anxious patient will break the operation part by trying to operate it again by force.

[0007] An object of the present disclosure is to realize a drug solution administration device that is capable of administering small amounts rapidly. [Means for solving the problem]

[0008] A first aspect of the drug solution administration device of the present disclosure comprises a flexible tubular body having an opening and a closed bottom, a reservoir having a base portion covering the opening of the flexible tubular body, inlet and outlet flow paths connected to the base portion and connected to the inside of the reservoir, a plunger that presses and deforms the flexible tubular body, and an operating portion that controls the storage of drug solution in the reservoir and the delivery of drug solution stored in the reservoir, wherein the flexible tubular body has a fixed portion formed on the opening side and fixed to the base portion, a pressing disk portion formed on the bottom side and pressed by the plunger, and a peripheral wall portion formed between the fixed portion and the pressing disk portion and forming an internal space, wherein the internal space narrows in diameter from the fixed portion side toward the pressing disk portion side, and has a narrowed portion between the pressing disk portion and the peripheral wall portion.

[0009] According to the first aspect of the drug solution administration device, since the internal space is narrowed from the fixed part side toward the pressing disk part side, the stroke length can be ensured even if the capacity of the reservoir is reduced. In addition, since the pressing force from the plunger to the flexible cylindrical body that stores the drug solution is transmitted via the pressing disk part, the flexible cylindrical body is deformed stably even if the flexible cylindrical body has a shape in which the diameter of the flexible cylindrical body is narrowed on one side. Therefore, the drug solution discharge from the reservoir can be stabilized.

[0010] In the first aspect of the drug solution administration device, the height of the internal space between the end on the fixed part side and the end on the pressing disk part side can be 0.4 to 0.8 times the inner diameter of the end on the fixed part side. By configuring in this way, the flexible tubular part can be made to have a shape that is larger on the fixed part side and is easily crushed, while ensuring the height.

[0011] In the first aspect of the drug solution administration device, the peripheral wall portion may have a curved surface that is convex toward the fixed portion side. By adopting such a configuration, the peripheral wall portion can be prevented from buckling and collapsing all at once, enabling smooth discharge.

[0012] In the first aspect of the drug solution administration device, the peripheral wall can be made thicker at the end on the fixed part side than at the end on the pressing disk side. By making the end on the fixed part side, where the diameter of the internal space is large and unintended expansion is likely to occur when the drug solution is filled, thickening the wall can suppress unintended expansion while ensuring the deformability of the flexible cylindrical body, thereby improving the accuracy of the dosage.

[0013] In the first aspect of the drug solution administration device, the peripheral wall portion may have an inclination angle of 15° or more and 45° or less at the end portion on the fixing portion side. With this configuration, the outer edge portion of the peripheral wall portion rises gently, making it difficult for deformation such as buckling to occur.

[0014] In the first aspect of the drug solution administration device, the outer diameter of the pressing disk portion can be made smaller than the outer diameter of the end of the peripheral wall portion on the fixed portion side. By adopting such a configuration, the pressing disk portion can crush the peripheral wall portion to the lower end.

[0015] In the first aspect of the drug solution administration device, the pressing disk portion can have a surface on the peripheral wall portion side that is curved convexly toward the fixed portion side. With this configuration, when pressed, the center of the peripheral wall portion is first depressed, and the outer edge portion gradually deforms. Therefore, the peripheral wall portion can deform more smoothly than when the pressing surface is flat, and sudden deformation such as buckling can be prevented.

[0016] In the first aspect of the drug solution administration device, the pressing disk part may be provided with a pressing surface on the fixed part side that extends toward the fixed part side and abuts against and presses the outer surface of the peripheral wall part. By adopting such a configuration, the peripheral wall part can be easily pressed with a surface so as to be crushed evenly, and the drug can be administered smoothly.

[0017] A second aspect of the drug solution administration device of the present disclosure comprises a flexible tubular body having an opening and a closed bottom, a reservoir having a base portion covering the opening of the flexible tubular body, inflow and outflow flow paths connected to the base portion and connected to the inside of the reservoir, a plunger that presses the flexible tubular body to deform it, and an operation portion that controls the storage of drug solution in the reservoir and the delivery of drug solution stored in the reservoir, wherein the flexible tubular body has a fixed portion formed on the opening side and fixed to the base portion, and a peripheral wall portion formed on the bottom side and forming an internal space, and is pressed by the plunger via the pressing disk portion, and the internal space narrows in diameter from the fixed portion side toward the pressing disk portion side, and the height between the end on the fixed portion side and the end on the pressing disk portion side is 0.4 to 0.8 times the inner diameter of the end on the fixed portion side.

[0018] According to the second aspect of the drug solution administration device, the internal space has a diameter that decreases from the fixed part side toward the pressing disk part side, and the height between the end of the internal space on the fixed part side and the end of the pressing disk part side is 0.4 times or more and 0.8 times or less of the inner diameter of the end of the internal space on the fixed part side. Therefore, even if the capacity of the reservoir is reduced, the height of the flexible tubular part can be increased while the diameter of the flexible tubular part is made easy to crush smoothly, and the stroke length can be ensured. In addition, since the plunger presses the flexible tubular body through the pressing disk part, the local pressing force from the plunger can be made into a pressing force as a surface, and a pressing force can be generated approximately uniformly on the flexible tubular body.

[0019] A third aspect of the drug solution administration device of the present disclosure comprises a flexible tubular body having an opening and a closed bottom, a reservoir having a base portion covering the opening of the flexible tubular body, inlet and outlet flow paths connected to the base portion and communicating with the inside of the reservoir, a plunger that presses and deforms the flexible tubular body, and an operating portion that controls the storage of drug solution in the reservoir and the delivery of drug solution stored in the reservoir, wherein the flexible tubular body has a fixed portion formed on the opening side and fixed to the base portion, and a peripheral wall portion formed on the bottom side and forming an internal space, and is pressed by the plunger via a pressing disk portion, the internal space narrows in diameter from the fixed portion side toward the pressing disk portion side, and the peripheral wall portion is a curved surface that is convex toward the fixed portion side.

[0020] According to the third aspect of the drug solution administration device, since the internal space narrows from the fixed part side toward the pressing disk part side, the stroke length can be ensured even if the capacity of the reservoir is reduced. Also, since the plunger presses the flexible cylindrical body via the pressing disk part, the local pressing force from the plunger can be made into a pressing force as a surface, and a pressing force can be generated approximately uniformly on the flexible cylindrical body. Also, since the peripheral wall part is a curved surface that is convex toward the fixed part side, the height of the reservoir can be increased.

[0021] A fourth aspect of the drug solution administration device comprises a flexible cylindrical body having an opening and a closed bottom, a reservoir having a base portion covering the opening of the flexible cylindrical body, inlet and outlet flow paths connected to the base portion and communicating with the inside of the reservoir, a plunger that presses the flexible cylindrical body to deform it, and an operation portion that controls the storage of drug solution in the reservoir and the delivery of the drug solution stored in the reservoir, wherein the flexible cylindrical body has a fixed portion formed on the opening side and fixed to the base portion, and a peripheral wall portion formed on the bottom side and forming an internal space, and is pressed by the plunger via the pressing disk portion, and the internal space narrows in diameter from the fixed portion side toward the pressing disk portion side, and the peripheral wall portion is thicker at the end on the fixed portion side than at the end on the pressing disk portion side.

[0022] According to the fourth aspect of the drug solution administration device, since the internal space is narrowed from the fixed part side toward the pressing disk part side, the stroke length can be ensured even if the capacity of the reservoir is reduced. In addition, by making the end of the fixed part side, which has a large internal space and is prone to unintended expansion when filled with drug solution, thickening the wall, it is possible to ensure the deformability of the flexible cylindrical body while suppressing unintended expansion, and to reduce the situation in which the reservoir is filled with excessive drug solution and overdosing occurs. In addition, since the plunger presses the flexible cylindrical body via the pressing disk part, the local pressing force from the plunger can be made into a pressing force as a surface, and a pressing force can be generated approximately uniformly on the flexible cylindrical body. Effect of the Invention

[0023] According to the drug solution administration device of the present disclosure, it is possible to solve the problems that arise when the rapid administration amount is reduced. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a cross-sectional view showing a drug solution administration device according to one embodiment. [Diagram 2] 1 is a side view showing a flexible cylindrical body of a reservoir of a drug solution administration device according to one embodiment. [Diagram 3]1 is a cross-sectional view showing a flexible cylindrical body of a reservoir of a drug solution administration device according to one embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] As shown in FIG. 1, a drug solution administration device according to one embodiment includes, in a housing 201, a reservoir 100 and a plunger 202 that is driven by a push button 203 to press and deform the reservoir 100.

[0026] The reservoir 100 has a flexible cylindrical body 110 and a base portion 150 that covers the opening of the flexible cylindrical body 110. An inflow flow path and an outflow flow path that communicate with the inside of the reservoir 100 are connected to the base portion 150. Note that in Fig. 1, some components other than the reservoir 100 are omitted or simplified, and for example, components such as tubes connecting each portion are not shown.

[0027] 2 and 3, the flexible cylindrical body 110 has an opening 131 and a closed bottom 132. A fixed portion 111 fixed to the base portion 150 is formed on the opening 131 side of the flexible cylindrical body 110, and a pressing disk portion 113 is formed on the bottom 132 side. A peripheral wall portion 112 surrounding an internal space 133 is formed between the fixed portion 111 and the pressing disk portion 113. When the pressing disk portion 113 is pressed by the plunger 202, the peripheral wall portion 112 is deformed and crushed so as to be gradually recessed from the center, and the internal space 133 is reduced.

[0028] The internal space 133 of the flexible cylindrical body 110 is gradually reduced in diameter from the fixed part 111 side (lower side) toward the pressing disk part 113 side (upper side). Therefore, even if the volume of the reservoir 100 is reduced, the height h1 of the internal space 133 can be increased to ensure a stroke length. Also, unlike the case where the overall inner diameter is reduced, the fixed part 111 fixed to the base part 150 can be ensured to be large, making it easier to fix to the base part 150. Furthermore, by matching the size of the fixed part 111 to that of a flexible cylindrical body of a reservoir with a large capacity, the parts other than the flexible cylindrical body can be configured in the same way as a drug solution administration device with a large capacity, and the parts can be shared to ensure that the operability does not change.

[0029] The inner diameter φi of the lower end of the internal space 133 and the height h1 of the internal space 133 can be determined according to the rapid administration amount, but from the viewpoint of ensuring the stroke length while ensuring the diameter on the fixed part 111 side, the height h1 is preferably 0.4 times or more, more preferably 0.5 times or more, preferably 0.8 times or less, and more preferably 0.7 times or less of the inner diameter φi. Also, from the viewpoint of making the internal space 133 have a shape that sufficiently narrows in diameter toward the upper end, the inner diameter φi of the lower end is preferably 8 times or more and preferably 18 times or less of the inner diameter of the upper end.

[0030] In this embodiment, the inner surface of the peripheral wall portion 112 is a curved surface that is convex downward. Compared to a curved surface that is convex upward, the volume of the upper portion of the internal space 133 can be made smaller, which is advantageous in terms of ensuring a stroke length by increasing the height h1. Also, the change in volume relative to a change in the height direction is small in the upper portion of the internal space 133, and large in the lower portion. Therefore, when the reservoir 100 is crushed to deliver the medicinal liquid inside, the delivery amount is small at first and gradually increases.

[0031] In the flexible cylindrical body 110 of this embodiment, the outer shape of the peripheral wall portion 112 also gradually decreases in diameter from the bottom to the top in accordance with the shape of the internal space 133. When the flexible cylindrical body having the peripheral wall portion 112 that decreases in diameter is pressed by the plunger 202, if the pressing disk portion 113 does not exist, the pressing force may be concentrated in a narrow range, causing distorted deformation. Since the flexible cylindrical body 110 of this embodiment has the pressing disk portion 113 on the peripheral wall portion 112 that decreases in diameter, the pressing force of the plunger 202 is transmitted to the peripheral wall portion 112 via the pressing disk portion 113, and stable deformation can be caused.

[0032] In the flexible cylindrical body of this embodiment, the pressing disk portion 113 connected to the upper end of the peripheral wall portion 112 has an outer diameter φ1 that is larger than the outer diameter φ2 of the upper end of the peripheral wall portion 112 and smaller than the outer diameter φ3 of the lower end. The peripheral wall portion 112 gradually reduces in diameter from the fixed portion 111 side to the pressing disk portion 113 side, and expands in diameter again at the pressing disk portion 113, so that the flexible cylindrical body 110 has a constricted portion 135 between the peripheral wall portion 112 and the pressing disk portion 113. In addition, the upper end of the peripheral wall portion 112 is connected to the vicinity of the center of the lower surface (the surface on the fixed portion 111 side) 141 of the pressing disk portion 113, and a space is formed between the lower surface 141 of the pressing disk portion 113 and the outer surface of the peripheral wall portion 112, the space being wider toward the radially outward direction.

[0033] In the flexible cylindrical body 110 of this embodiment, when the upper surface 142 of the pressing disk portion 113 is pressed by the plunger 202 with the fixed portion 111 fixed to the base portion 150, the pressing disk portion 113 moves downward as a whole. Meanwhile, due to the presence of the constricted portion 135, only the central portion of the peripheral wall portion 112 connected to the pressing disk portion 113 is initially pressed. As the pressing disk portion 113 descends, the contact portion between the lower surface 141 and the outer surface of the peripheral wall portion 112 gradually spreads outward, and eventually the entire lower surface 141 of the pressing disk portion 113 presses the peripheral wall portion 112.

[0034] In the flexible cylindrical body 110 of this embodiment, the outer diameter of the peripheral wall portion 112 becomes smaller toward the upper side. Therefore, if the pressing disk portion 113 does not exist and the upper end portion of the peripheral wall portion 112 is directly pressed by a thin plunger, only the center portion of the peripheral wall portion 112 is pressed and recessed, and the outer portion is not pressed from above and is deformed only by the force pulled by the recessed center portion. Therefore, the peripheral wall portion 112 is easily deformed distortedly.

[0035] Furthermore, if the plunger is made thinner so that only the center of the peripheral wall 112 can be pressed, the strength of the plunger decreases and the plunger becomes more likely to wobble when pressed. Furthermore, if the plunger is made thinner, it becomes necessary to significantly change the design of the configuration provided in association with the plunger, such as a mechanism that prevents repeated operation for a predetermined period of time.

[0036] In this embodiment, a pressing disk portion 113 is provided in which the outer diameter φ1 of the upper surface is larger than the outer diameter φ2 of the upper end of the peripheral wall portion 112, and the lower surface 141 of the pressing disk portion 113 on the peripheral wall portion 112 side faces the fixing portion 111 and serves as a pressing surface that abuts against and presses the outer surface of the peripheral wall portion 112. Therefore, the upper surface of the pressing disk portion 113 can be pressed by a thick plunger similar to that of an existing drug solution administration device with a large capacity, and a wide range of the peripheral wall portion 112 can be pressed and smoothly deformed and crushed. Therefore, parts can be shared with existing drug solution administration devices with a large capacity, and manufacturing costs can be reduced. In addition, since the pressing surface of the pressing disk portion 113 and the outer surface of the peripheral wall portion 112 gradually come into contact with each other, the peripheral wall portion 112 can be prevented from being crushed all at once, and the amount of drug delivered in the initial stage of the pressing operation can be prevented from increasing suddenly.

[0037] In this embodiment, the lower surface 141 of the pressing disk portion 113 is a curved surface that is convex downward. As a result, compared to when the lower surface 141 is flat, the center of the peripheral wall portion 112 is first depressed, and the outer edge portion is gradually deformed. As a result, the contact and pressing with the peripheral wall portion 112 can proceed more smoothly than when the lower surface 141 of the pressing disk portion 113 is a flat surface, and deformation such as buckling can be made less likely to occur. However, the lower surface 141 of the pressing disk portion 113 can also be a flat surface.

[0038] In this embodiment, the outer surface of the peripheral wall portion 112 is also a curved surface that is convex downward. Compared to when the outer surface of the peripheral wall portion 112 is convex upward or is linear, the height of the reservoir can be increased even with the same capacity, and the stroke length can be increased. In addition, when pressed, buckling and the like are unlikely to occur, and the reservoir can be deformed smoothly. In particular, when the lower surface 141 of the pressing disk portion 113 is convex downward, the contact with and pressing against the lower surface 141 occurs more smoothly.

[0039] The outer surface of the peripheral wall 112 can have an inclination angle θ of preferably 45° or less at the lower end. By setting the inclination angle θ at the lower end to 45° or less and making the peripheral wall rise gently from the fixed portion 111, it is possible to make it difficult for the wall surface to deform in such a way that it buckles, even near the lower end. Although it is possible to set the inclination angle θ at the lower end to 0°, from the viewpoint of easily ensuring the height, the inclination angle θ is preferably 15° or more.

[0040] Since the flexible cylindrical body is a member that stores and delivers the medicinal liquid by deforming, there is a risk that unexpected expansion may occur when storing the medicinal liquid, resulting in the storage of more medicinal liquid than the design value. When the absolute amount of medicinal liquid stored in the reservoir is large, the change in the storage amount due to the expansion of the flexible cylindrical body can be easily kept within the allowable range. However, in a reservoir with a small storage amount, it is necessary to thoroughly consider the increase in the storage amount due to the expansion of the flexible cylindrical body.

[0041] In this embodiment, the thickness t2 of the peripheral wall 112 at the lower end is greater than the thickness t1 at the upper end. In the flexible cylindrical body 110 of this embodiment, the inner space 133 has a larger diameter toward the bottom, so that expansion is likely to occur near the middle position when the liquid medicine is stored. By making the wall thickness t2 at the lower end of the peripheral wall 112 greater than the wall thickness t1 at the upper end, it is possible to reduce expansion when the liquid medicine is stored and to reduce errors in the amount of stored medicine. By making the wall thickness t1 at the upper end thinner, it is also possible to ensure the deformability of the flexible cylindrical body 110 when pressed.

[0042] The wall thickness t1 at the upper end and the wall thickness t2 at the lower end can be set according to the amount of medicinal liquid stored and the material of the flexible cylindrical body, but when the amount of stored liquid in the reservoir is about 0.5 mL to 1 mL, it is preferable that the wall thickness t2 at the lower end is about 1.2 to 1.8 times the wall thickness t1 at the upper end. Specifically, it is preferable that the wall thickness t1 at the upper end is about 0.2 mm to 0.4 mm, and the wall thickness at the lower end is about 0.3 mm to 0.7 mm.

[0043] The wall thickness of the peripheral wall portion 112 is preferably gradually increased from the upper end to the lower end, but it may also be configured so that it is thick only near the lower end.

[0044] The flexible cylindrical body 110 of this embodiment has a positioning protrusion 114 protruding from the upper surface of the pressing disk portion 113. By inserting the positioning protrusion 114 into a recess provided in the plunger 202, the plunger 202 and the pressing disk portion 113 can be abutted at the correct position, allowing smooth pressing.

[0045] In this embodiment, the pressing disk portion 113 and the positioning protrusions 114 are integrally molded with the fixed portion 111 and the peripheral wall portion 112 of the flexible cylindrical body 110. By integrally molding the pressing disk portion 113 with the fixed portion 111 and the peripheral wall portion 112, the flexible cylindrical body 110 can be easily formed. However, the pressing disk portion 113 and the positioning protrusions 114 can be molded as separate bodies from the fixed portion 111 and the peripheral wall portion 112. Also, the pressing disk portion 113 can be molded integrally with the fixed portion 111 and the peripheral wall portion 112, with only the positioning protrusions 114 being a separate body, or the positioning protrusions 114 can be molded integrally with the pressing disk portion 113 being a separate body.

[0046] In this embodiment, the fixing portion 111 is formed to be thicker than the peripheral wall portion 112. The fixing portion 111 has a clamping portion 145 formed on the radially outer side, and a contact portion 146 formed between the clamping portion 145 and the peripheral wall portion 112. The clamping portion 145 is accommodated in an accommodating groove formed in the base portion 150, and is pressed and fixed by a fixing ring 153. The contact portion 146 abuts against a flange surface surrounding a recess formed in the base portion 150. As a result, the opening 131 of the flexible cylindrical body 110 is covered by the base portion 150.

[0047] In this embodiment, the recess of the base part 150 has a curvature that is slightly larger than the curvature of the lower surface 141 of the pressing disk part 113. As a result, when the flexible cylindrical body 110 is crushed by the plunger 202, the shape of the inner wall surface of the peripheral wall part 112 pressed by the lower surface 141 of the pressing disk part 113 and the shape of the recess of the base part 150 approximately match, and the medicinal solution remaining in the reservoir 100 can be reduced.

[0048] An inflow flow path and an outflow flow path are connected to the base portion 150, so that the medicinal liquid can be flowed into and stored in the reservoir 100, and the medicinal liquid in the reservoir 100 can be discharged. In Fig. 1, a part of the outflow flow path is indicated by reference numeral 151. The inflow flow path and the outflow flow path are provided with valves (not shown), and the valves are operated by the control portion to control the storage and discharge of the medicinal liquid.

[0049] Push button 203 is attached to plunger 202 with spring 205 sandwiched therebetween. When push button 203 is pressed, it is locked in the pressed position. This causes spring 205 to be compressed, and plunger 202 presses against pressing disk portion 113, crushing flexible cylindrical body 110. At this time, the control unit controls the valve body so that the liquid flows to the outflow flow path side, so that the medicinal liquid in reservoir 100 flows out from the outflow flow path.

[0050] When the plunger 202 moves to the fully pressed position, the claw 213 of the plunger 202 unlocks the push button 203, and the control unit controls the valve body to close the outflow flow path and open the inflow flow path. This fills the reservoir 100 with the medicinal liquid, and the flexible tubular body 110 returns to its original shape. As the flexible tubular body 110 returns to its original position, the plunger 202 and the push button 203 return to their original positions, making it possible to perform another rapid administration operation. The flow rate of the inflow flow path is adjusted so that it takes a predetermined time for the medicinal liquid to fill the reservoir 100.

[0051] The drug solution administration device may also be provided with a mechanism that enables priming before use. [Industrial Applicability]

[0052] The medicinal liquid administration device of the present disclosure can solve problems that arise when the rapid administration amount is reduced, and is useful as a medicinal liquid administration device for medical use, etc. [Explanation of symbols]

[0053] 100 Reservoir 110 Flexible cylindrical body 111 Fixed part 112 Peripheral wall section 113 Pressing disk part 114 Positioning protrusion 131 Opening 132 Bottom 133 Interior Space 135 Waist 141 Top surface 142 Bottom surface 145 Clamping part 146 Contact part 150 Base 153 Fixing Ring 201 Housing 202 Plunger 203 Push Button 205 Spring 213 Nails

Claims

1. a reservoir having a flexible tubular body with an opening and a closed bottom and a base portion covering the opening of the flexible tubular body; an inlet flow passage and an outlet flow passage connected to the base portion and communicating with the interior of the reservoir; A plunger that presses and deforms the flexible cylindrical body; An operation unit that controls the storage of the medicinal liquid in the reservoir and the delivery of the medicinal liquid stored in the reservoir, the flexible cylindrical body has a fixing portion formed on the opening side and fixed to the base portion, a pressing disk portion formed on the bottom side and pressed by the plunger, and a peripheral wall portion formed between the fixing portion and the pressing disk portion and forming an internal space; The internal space narrows in diameter from the fixed portion side toward the pressing disk portion side, A medicinal solution administration device having a constricted portion between the pressure disk portion and the peripheral wall portion.

2. The drug solution administration device of claim 1, wherein the height of the internal space between the end on the fixed portion side and the end on the pressing disk portion side is 0.4 to 0.8 times the inner diameter of the end on the fixed portion side.

3. The drug solution administration device according to claim 1 , wherein the peripheral wall portion has a curved surface that is convex toward the fixing portion.

4. The drug solution administration device according to claim 1 , wherein the peripheral wall portion is thicker at an end portion on the fixed portion side than at an end portion on the pressing disk portion side.

5. The drug solution administration device according to claim 1 , wherein the peripheral wall portion has an inclination angle of 15° or more and 45° or less at the end portion on the fixing portion side.

6. The medicine injection device according to claim 1 , wherein an outer diameter of the pressing disk portion is smaller than an outer diameter of an end portion of the peripheral wall portion on the fixed portion side.

7. The drug solution administration device according to claim 1 , wherein the pressing disk portion has a surface on the side of the peripheral wall portion that is curved convexly toward the fixed portion.

8. The drug solution administration device according to any one of claims 1 to 7, wherein a pressing surface is formed on the fixed portion side of the pressing disk portion, extending toward the fixed portion side and abutting against and pressing against the outer surface of the peripheral wall portion.

9. a reservoir having a flexible cylindrical body having an opening and a closed bottom and a base portion covering the opening of the flexible cylindrical body; an inlet flow passage and an outlet flow passage connected to the base portion and communicating with the interior of the reservoir; A plunger that presses and deforms the flexible cylindrical body; An operation unit that controls the storage of the medicinal liquid in the reservoir and the delivery of the medicinal liquid stored in the reservoir, the flexible cylindrical body has a fixing portion formed on the opening side and fixed to the base portion, and a peripheral wall portion formed on the bottom side and forming an internal space, and is pressed by the plunger via a pressing disk portion; A drug solution administration device in which the internal space narrows in diameter from the fixed portion side toward the pressing disk portion side, and the height between the end on the fixed portion side and the end on the pressing disk portion side is 0.4 to 0.8 times the inner diameter of the end on the fixed portion side.

10. a reservoir having a flexible cylindrical body having an opening and a closed bottom and a base portion covering the opening of the flexible cylindrical body; an inlet flow passage and an outlet flow passage connected to the base portion and communicating with the interior of the reservoir; A plunger that presses and deforms the flexible cylindrical body; An operation unit that controls the storage of the medicinal liquid in the reservoir and the delivery of the medicinal liquid stored in the reservoir, the flexible cylindrical body has a fixing portion formed on the opening side and fixed to the base portion, and a peripheral wall portion formed on the bottom side and forming an internal space, and is pressed by the plunger via a pressing disk portion; The internal space narrows in diameter from the fixed portion side toward the pressing disk portion side, A medicinal solution administration device, wherein the outer surface of the peripheral wall portion is a curved surface that is convex toward the fixed portion.

11. a reservoir having a flexible cylindrical body having an opening and a closed bottom and a base portion covering the opening of the flexible cylindrical body; an inlet flow passage and an outlet flow passage connected to the base portion and communicating with the interior of the reservoir; A plunger that presses and deforms the flexible cylindrical body; An operation unit that controls the storage of the medicinal liquid in the reservoir and the delivery of the medicinal liquid stored in the reservoir, the flexible cylindrical body has a fixing portion formed on the opening side and fixed to the base portion, and a peripheral wall portion formed on the bottom side and forming an internal space, and is pressed by the plunger via a pressing disk portion; The internal space narrows in diameter from the fixed portion side toward the pressing disk portion side, A medicinal solution administration device, wherein the peripheral wall portion is thicker at the end portion on the fixed portion side than at the end portion on the pressing disk portion side.

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