Chemical injection controller

Abstract

To provide a drug solution injection controller having a novel structure such that, while being compact, priming of a sub-line can be completed rapidly.SOLUTION: A push operation member 78 for performing rapid administration of a drug solution is fitted, in such a manner as to be capable of moving back-and-forth, in a housing 34 accommodating a sub-reservoir 36. Arranged along a straight line in the moving direction of the push operation member 78 are a push operation surface 79 of the push operation member 78, the sub-reservoir 36, and an inflow side and outflow side flow path provision space 115 for the drug solution to and from the sub-reservoir 36. Disposed in the flow path provision space 115 are a rapid administration valve 116 for establishing communication in, and for shutting-down, the flow path 96 on the outflow side, a limiting flow path 94 provided on the flow path 92 on the inflow side, a priming flow path 95 bypassing the limiting flow path 94, and a closing valve 140 for shutting down the priming flow path 95.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a liquid medicine injection controller for performing self-operated rapid injection of a liquid medicine in a liquid medicine administration device for performing continuous administration of a liquid medicine. [Background technology]

[0002] Conventionally, there has been known a drug administration device that continuously administers a drug solution from a main reservoir through a main line. The drug administration device is used to continuously administer small amounts of a painkiller or anesthetic into the body, and a flow rate control unit that limits the flow rate of the drug solution is provided in the main line that connects the main reservoir to a connector that is the drug solution input side to the patient.

[0003] Some drug solution administration devices include a drug solution injection controller for rapid administration of drug solution by a patient. The drug solution injection controller includes a sub-reservoir for storing drug solution, and when a patient operates the controller by, for example, pressing a push button, the drug solution stored in the sub-reservoir of the drug solution injection controller is rapidly administered into the patient's body through a sub-line branching from the main line. The sub-line is a line that includes flow paths for the drug solution inlet and outlet to the sub-reservoir.

[0004] In order to prevent excessive administration of drug solution due to rapid administration of drug solution at short intervals, drug solution injection controllers are required to have high functionality, such as a restrictive flow path that limits the flow rate on the flow path supplying drug solution to the sub-reservoir.However, there is a problem that the more functional the controller, the larger the size becomes. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made against the background of the above-mentioned circumstances, and the problem to be solved is to provide a drug solution injection controller of a novel structure that is compact and can quickly complete priming of a sub-line including flow paths on the inlet and outlet sides of the drug solution to a sub-reservoir. [Means for solving the problem]

[0006] The following describes aspects of the present invention that have been made to solve the above problems. The aspects described below can be employed in any combination, and the components employed in the aspects described below can also be employed in any combination possible in other aspects. [Aspect 1] A drug solution injection controller, comprising: a sub-reservoir housed in a housing and connected via a sub-line to a main line for continuous drug solution administration; and the controller enabling rapid administration of drug solution from the sub-reservoir by self-operation, the device comprises a pressing member that is pressed when rapid administration of a medicinal solution is to be performed; a rapid administration valve that is a member separate from the pressing member and that switches a flow path on the medicinal solution outflow side from the sub-reservoir between a connected state and a blocked state; valve biasing means that biases the rapid administration valve from the connected state to the blocked state; a restriction flow path and a priming flow path that are provided in parallel in the flow path on the medicinal solution inflow side to the sub-reservoir in the sub-line; and a switch member that has a shut-off valve that blocks the priming flow path, By operating the switch member, the priming flow path is shut off and the rapid administration valve is permitted to move, so that the flow path on the drug solution outflow side is shut off by the valve biasing means, A pressing force applied to the pressing member is applied to the rapid administration valve, causing the rapid administration valve to switch from a shut-off state to a communicating state against the valve biasing means. Chemical injection controller. [Aspect 2] The switch member and the rapid administration valve are movable in the same direction in the housing, and the switch member and the rapid administration valve are provided with opposing surfaces that are close to each other and can move relatively. The liquid medicine injection controller according to aspect 1. [Aspect 3] A switch member constituting the shut-off valve is provided penetrating the peripheral wall of the housing from the inside to the outside, and a tip surface of the switch member for pressing that protrudes from the housing and a portion of the shut-off valve that blocks the priming flow path overlap in the direction of movement of the switch member when pressed. 3. The liquid medicine injection controller according to claim 1 or 2. [Aspect 4] a flow rate control section provided in the housing, the flow rate control section connecting a drug solution inflow channel and a drug solution outflow channel to the sub-reservoir, and enabling continuous drug solution administration without passing through the sub-reservoir; the flow path on the chemical liquid inlet side and the flow path on the chemical liquid outlet side are provided in parallel, Both end portions of the flow control section are inserted into cylindrical branch port sections that protrude from the flow path on the inflow side of the chemical liquid and the flow path on the outflow side in directions intersecting the length direction of the flow paths and are arranged in parallel to each other, and are connected to the flow path on the inflow side of the chemical liquid and the flow path on the outflow side of the chemical liquid. The chemical liquid injection controller according to any one of the first to third aspects. [Aspect 5] the sub-line has a flow path on a drug solution inlet side and a flow path on a drug solution outlet side relative to the sub-reservoir, The flow path on the chemical solution inlet side has a tubular connecting portion that protrudes and branches in a direction intersecting the flow path length direction, and the connecting portion is positioned relative to the housing. The chemical liquid injection controller according to any one of the first to fourth aspects. [Aspect 6] The direction of movement of the switch member is perpendicular to the direction of movement of the pressing operation member. The chemical liquid injection controller according to any one of the first to fifth aspects. [Aspect 7] In a plan view seen from the direction of movement of the switch member, the switch member is positioned away from the central axis of the housing. The chemical liquid injection controller according to any one of the first to sixth aspects. [Aspect 8] the stop valve has an inclined abutment side inclined with respect to a moving direction at a portion pressed against the priming flow path, The priming flow path is compressed and crushed in a direction perpendicular to the movement direction of the shut-off valve. The chemical liquid injection controller according to any one of the first to seventh aspects. [Aspect 9] The switch member is maintained in the pressed-in position by a locking piece provided on the switch member so as to protrude in the direction of movement and locking with the housing. The chemical liquid injection controller according to any one of the first to eighth aspects. [Aspect 10] A drug solution injection controller, comprising: a sub-reservoir housed in a housing and connected via a sub-line to a main line for continuous drug solution administration; and the controller enabling rapid administration of drug solution from the sub-reservoir by self-operation, a restriction flow path and a priming flow path provided in parallel in a flow path on the drug solution inflow side to the sub-reservoir in the sub-line, and a shut-off valve that blocks the priming flow path, The housing has a cylindrical peripheral wall portion, and a pressing operation member that is pressed when rapid administration of a medicinal solution is performed is assembled to one end side of the peripheral wall portion in a longitudinal direction so as to be reciprocally movable in the longitudinal direction of the peripheral wall portion, A switch member having the shut-off valve is attached to the housing by penetrating the peripheral wall portion of the housing, and the direction of movement of the switch member when pressed is perpendicular to the longitudinal direction of the peripheral wall portion. Chemical injection controller. [Aspect 11] A drug solution injection controller, comprising: a sub-reservoir housed in a housing and connected via a sub-line to a main line for continuous drug solution administration; and the controller enabling rapid administration of drug solution from the sub-reservoir by self-operation, The sub-line includes a restriction flow path and a priming flow path that are provided in parallel in a flow path on the drug solution inflow side to the sub-reservoir, and a shut-off valve that blocks the priming flow path; the main line is provided with a flow control section that connects a drug solution inflow channel and a drug solution outflow channel to the sub-reservoir, thereby enabling continuous drug solution administration without passing through the sub-reservoir; the flow path on the chemical liquid inlet side and the flow path on the chemical liquid outlet side are provided in parallel, Both end portions of the flow rate control section are inserted into cylindrical branch port sections that protrude from the flow path on the chemical liquid inlet side and the flow path on the chemical liquid outlet side in a direction intersecting the flow path length direction and are arranged in parallel to each other, and are connected to the flow path on the chemical liquid inlet side and the flow path on the chemical liquid outlet side. Chemical injection controller. [Aspect 12] A drug solution injection controller, comprising: a sub-reservoir housed in a housing and connected via a sub-line to a main line for continuous drug solution administration; and the controller enabling rapid administration of drug solution from the sub-reservoir by self-operation, The sub-line has a flow path on the drug solution inlet side and a flow path on the drug solution outlet side relative to the sub-reservoir, a restriction flow path and a priming flow path provided in parallel in a flow path on the drug solution inflow side relative to the sub-reservoir, and a shut-off valve that blocks the priming flow path, The flow path on the chemical solution inlet side has a tubular connecting portion that protrudes and branches in a direction intersecting the flow path length direction, and the connecting portion is positioned relative to the housing. Chemical injection controller. [Aspect 13] A drug solution injection controller, comprising: a sub-reservoir housed in a housing and connected via a sub-line to a main line for continuous drug solution administration; and the controller enabling rapid administration of drug solution from the sub-reservoir by self-operation, a restriction flow path and a priming flow path provided in parallel in a flow path on the drug solution inflow side to the sub-reservoir in the sub-line, and a shut-off valve that blocks the priming flow path, A flow rate control unit is housed in the housing, which connects a flow path on the drug solution inlet side and a flow path on the drug solution outlet side of the sub-reservoir in the main line, and enables continuous drug solution administration without passing through the sub-reservoir. Chemical injection controller. This application is a divisional application, and in addition to the above [Aspects 1 to 10], this specification also discloses the following 1st to 16th aspects.

[0007] That is, a first aspect of the present invention is a drug solution injection controller, in which a pressing operation member for performing rapid drug solution administration is assembled so as to be able to move back and forth in a housing that accommodates a sub-reservoir, and a pressing operation surface of the pressing operation member, the sub-reservoir, and a flow path arrangement space in which flow paths on the inlet and outlet sides of the drug solution to the sub-reservoir are arranged are arranged in series in the direction of movement of the pressing operation member, and the flow path arrangement space is provided with a rapid administration valve that connects / blocks the flow path on the outlet side, a restricting flow path provided on the inlet side flow path, a priming flow path on the inlet side flow path that bypasses the restricting flow path, and a shut-off valve that blocks the priming flow path.

[0008] In a liquid medicine injection controller constructed according to this aspect, a flow path arrangement space is provided relative to the sub-reservoir in the direction of movement of the pressing operation member, and a priming flow path that bypasses the restriction flow path is provided in the flow path arrangement space, along with a shut-off valve that shuts off the priming flow path. By injecting priming solution into the priming flow path while it is in communication, the priming solution is quickly filled through the priming flow path into the sub-reservoir and the sub-line, which includes the flow paths on the inlet and outlet sides of the liquid medicine for the sub-reservoir. This reduces the time required to prime the sub-line.

[0009] Furthermore, by blocking the priming flow path with the shut-off valve after priming of the sub-line is complete, the time required for refilling the sub-reservoir with the medicinal liquid is set by the restrictive flow path, thereby preventing rapid and continuous administration of medicinal liquid and preventing overadministration of medicinal liquid.

[0010] Furthermore, the pressing surface of the pressing member, the sub-reservoir, and the spaces for arranging the inlet and outlet flow paths for the liquid medicine relative to the sub-reservoir are arranged in series in the direction of reciprocation of the pressing member. This allows the liquid medicine injection controller to have a compact structure in a direction perpendicular to the direction of reciprocation of the pressing member. Therefore, for example, when a user holds the housing in one hand and presses the pressing surface with their thumb, the user can easily grasp the housing, making it easier to press the pressing surface, and the liquid medicine injection controller is less bulky when stored in the user's pocket, for example.

[0011] A second aspect of the present invention is a drug solution injection controller as described in the first aspect, in which the sub-reservoir is arranged closer to the pressing operation member than the center of the housing in the direction of movement of the pressing operation member.

[0012] According to a chemical liquid injection controller constructed in accordance with this aspect, it is possible to secure a large space for arranging the inlet and outlet flow paths arranged in series with the sub-reservoir without increasing the size of the housing.

[0013] In a third aspect of the present invention, in the drug solution injection controller described in the first or second aspect, a plunger is provided that compresses the sub-reservoir when the pressing operation member is pressed, and a coil spring is provided that urges the plunger toward the sub-reservoir, a recess that opens toward the pressing operation member is formed in the plunger, and the pressing operation member is provided with a protrusion that protrudes toward the recess, and both end portions of the coil spring are positioned by the recess of the plunger and the protrusion of the pressing operation member.

[0014] With a drug solution injection controller constructed in accordance with this aspect, the coil spring can be maintained in an extended arrangement between the plunger and the pressing operation member through a simple structure that provides a recess in the plunger and a protrusion on the pressing operation member.

[0015] Furthermore, for example, the protrusion of the pressing operation member that has been moved to the pressed-in position by the pressing operation may be inserted into the recess of the plunger, thereby ensuring a sufficient stroke for the pressing operation of the pressing operation member in a compact chemical liquid injection controller.

[0016] A fourth aspect of the present invention is a chemical liquid injection controller according to any one of the first to third aspects, wherein the flow path on the outflow side is blocked by being pressed by the rapid administration valve in a direction perpendicular to the direction of movement of the pressing operation member.

[0017] According to the liquid medicine injection controller constructed in accordance with this aspect, by arranging the rapid administration valve to the side of the outflow flow path, it is possible to reduce the dimensions of the housing in the direction of movement of the pressing operation member.

[0018] A fifth aspect of the present invention is a chemical liquid injection controller according to any one of the first to fourth aspects, wherein the priming flow path is blocked by being pressed by the shut-off valve in a direction perpendicular to the direction of movement of the pressing operation member.

[0019] According to the chemical liquid injection controller constructed in accordance with this aspect, by disposing the shutoff valve to the side of the priming flow path, it is possible to reduce the dimensions of the housing in the direction of movement of the pressing operation member.

[0020] A sixth aspect of the present invention is a chemical liquid injection controller according to any one of the first to fifth aspects, wherein the priming flow path extends linearly from the sub-reservoir in the direction of movement of the pressing operation member.

[0021] With a chemical liquid injection controller constructed in accordance with this aspect, the priming flow path, which has a relatively large flow path diameter in order to complete priming in a short time, is made linear, eliminating the need for processing to bend the priming flow path or increasing the number of parts, and making it easier to manufacture the priming flow path.

[0022] By extending the priming flow path in the direction of movement of the pressing operation member, the size of the liquid medicine injection controller can be reduced in the direction perpendicular to the direction of movement of the pressing operation member.

[0023] A seventh aspect of the present invention is a drug solution injection controller described in any one of the first to sixth aspects, wherein the housing is elongated, the outer peripheral surface of the housing is a surface to be gripped by the user's hand, the pressing operation member is provided on one side of the housing in the longitudinal direction, and the pressing operation member is capable of moving back and forth in the longitudinal direction of the housing, and the pressing operation surface is configured as a fingertip pressing surface on the tip surface of the pressing operation member that is pressed by the user's thumb.

[0024] With a drug solution injection controller constructed in accordance with this embodiment, the user can apply sufficient force to the pressing operation surface by holding the gripping surface with one hand and pressing the pressing operation member with their thumb, allowing the user to reliably administer drug solutions rapidly by themselves.

[0025] Furthermore, the pressing surface of the pressing member, the sub-reservoir, and the flow path arrangement spaces for the inlet and outlet sides of the sub-reservoir for the drug solution are arranged in series along the longitudinal direction of the housing, which makes it possible to make the housing more compact in the direction perpendicular to the longitudinal direction and to narrow the gripping surface.

[0026] An eighth aspect of the present invention is a chemical liquid injection controller described in any one of the first to seventh aspects, wherein the cross-sectional shape of the housing in a direction perpendicular to the movement direction of the pressing operation member is a flat hollow cross-sectional shape.

[0027] The liquid injection controller constructed according to this embodiment can secure a large amount of space within the housing in the longitudinal direction of the cross section of the housing. The housing can be made smaller in the transverse direction of the cross section of the housing, making it less bulky when carried in a user's pocket, for example. Furthermore, the housing's flat cross-sectional shape makes it easy to grip.

[0028] A ninth aspect of the present invention is a chemical liquid injection controller described in any one of the first to eighth aspects, wherein the shut-off valve has a plate-shaped valve body with an inclined abutment edge that closes the priming flow path by squeezing it.

[0029] In a chemical solution injection controller constructed according to this aspect, the contact portion of the shut-off valve with the priming flow path has an inclined contact edge that is inclined with respect to the direction of approach of the shut-off valve to the priming flow path. Therefore, the repulsive force of the priming flow path acting in a direction pushing back the shut-off valve is reduced compared to when the contact portion of the shut-off valve with the priming flow path is perpendicular to the direction of approach to the priming flow path. As a result, the shut-off valve can be switched to the closed state and the priming flow path shut off with a relatively small operating force.

[0030] A tenth aspect of the present invention is a drug solution injection controller according to any one of the first to ninth aspects, wherein a flow control unit is provided that connects the inlet flow path and the outlet flow path and continuously administers the drug solution without passing through the sub-reservoir.

[0031] According to a liquid medicine injection controller constructed in accordance with this aspect, since a flow control unit is provided in the liquid medicine injection controller, in a liquid medicine administration device comprising a liquid medicine injection controller, both the external line from the main reservoir to the liquid medicine injection controller and the external line from the liquid medicine injection controller to the liquid medicine administration port on the patient side can be simply configured.

[0032] Furthermore, by connecting the liquid medicine injection controller to an external line, the liquid medicine administration device can be easily provided with a flow rate control unit.

[0033] An eleventh aspect of the present invention is a chemical liquid injection controller according to the tenth aspect, wherein the flow control unit is provided at a position farther from the pressing operation member than the restriction flow path, the priming flow path, and the shut-off valve.

[0034] A liquid medicine injection controller constructed in accordance with this aspect is less likely to cause interference between actuating members such as shut-off valves and pressure operating members and the flow control unit that constitutes a continuous liquid medicine administration line.

[0035] A twelfth aspect of the present invention is a drug solution injection controller according to the tenth or eleventh aspect, wherein the cross-sectional shape of the housing in a direction perpendicular to the direction of movement of the pressing operation member is a flat, hollow cross-sectional shape, and at least one of the extension direction of a connecting flow path that is arranged to connect the inlet side flow path and the outlet side flow path and has the flow control unit, the movement direction of the rapid administration valve relative to the outlet side flow path, and the movement direction of the shut-off valve relative to the priming flow path is the longitudinal axis direction in the cross section of the housing.

[0036] In a liquid injection controller constructed according to this aspect, the extension direction of the connecting flow path, the movement direction of the rapid administration valve, and the movement direction of the shut-off valve are aligned with the longitudinal axis of the cross section of the housing, thereby ensuring ample space within the housing for the arrangement of the connecting flow path and the space required for the valve stroke. In particular, by aligning the extension direction of the connecting flow path with the longitudinal axis of the housing cross section, ample space can be ensured for the arrangement of the connecting flow path, thereby providing greater flexibility in setting the length and cross-sectional area of ​​the connecting flow path.

[0037] A thirteenth aspect of the present invention is a chemical liquid injection controller described in any one of the tenth to twelfth aspects, wherein the inlet flow path and the outlet flow path are each provided with a port for connecting to an external flow path, and a connecting flow path having the flow control unit is provided to connect both ports.

[0038] According to a chemical liquid injection controller constructed in accordance with this aspect, the connecting flow path is positioned close to the housing or is contained within the housing, which can improve the ease of handling of the connecting flow path compared to when the connecting flow path is located farther from the housing in the external flow path.

[0039] A fourteenth aspect of the present invention is the chemical liquid injection controller according to the thirteenth aspect, wherein the connection flow path is arranged within the housing, curved in the circumferential direction of the housing.

[0040] The chemical liquid injection controller constructed according to this aspect allows the connection flow path to be accommodated in the housing with high space efficiency. In addition, the curved connection flow path makes it less likely to kink.

[0041] A fifteenth aspect of the present invention is the chemical liquid injection controller according to any one of the tenth to fourteenth aspects, further comprising a regulating part that regulates movement of the flow rate control part.

[0042] With a drug solution injection controller constructed in accordance with this embodiment, the movement of the flow control unit is restricted to some extent by the regulating unit, thereby preventing bending (kinking) of the flow control unit when the flow control unit is assembled into the housing or when an impact force is applied to the flow control unit.

[0043] A sixteenth aspect of the present invention is the liquid chemical injection controller according to any one of the tenth to fifteenth aspects, wherein the flow rate control unit is accommodated in the housing.

[0044] In a chemical liquid injection controller configured according to this aspect, the flow control unit is housed in a housing, which facilitates handling of the flow control unit and protects the flow control unit. The flow control unit can be configured, for example, with a small-diameter tube. In this case, the tubular flow control unit can be bent or wound to any length and housed in the housing more compactly. [Effects of the Invention]

[0045] According to the present invention, the priming of the sub-lines can be completed quickly while being compact. [Brief explanation of the drawings]

[0046] [Figure 1] 1 is a diagram showing a chemical liquid administration device including a chemical liquid injection controller according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a diagram illustrating a schematic configuration of the drug solution administration device shown in FIG. [Figure 3] FIG. 2 is a perspective view of a liquid medicine injection controller constituting the liquid medicine administration device shown in FIG. [Figure 4] FIG. 4 is a plan view of the chemical liquid injection controller shown in FIG. 3. [Figure 5] FIG. 4 is a front view of the chemical liquid injection controller shown in FIG. 3. [Figure 6] 4 is a perspective view of the chemical liquid injection controller shown in FIG. 3 with the upper half of the housing removed. [Figure 7] 4 is a perspective view of the chemical liquid injection controller shown in FIG. 3 with the lower half of the housing removed. [Figure 8] Cross-sectional view of VIII-VIII in Figure 5. [Figure 9] IX-IX cross section of Figure 4. [Figure 10] Cross-sectional view taken along line XX in Figure 4. [Figure 11] XI-XI cross section of Figure 4. [Figure 12] A view corresponding to the XII-XII cross section of Figure 4. [Figure 13]XIII-XIII cross section of Figure 4. [Figure 14] 14 is a cross-sectional view taken along line XIV-XIV in FIG. 4, showing a state after the switch member has been pushed in. FIG. [Figure 15] 10 is a cross-sectional view taken along the line XV-XV in FIG. 4, showing the state immediately after the push button is pressed. [Figure 16] 16 is a cross-sectional view taken along the line XVI-XVI in FIG. 4, showing the state immediately after the push button is pressed. [Figure 17] 17 is a cross-sectional view taken along the line XVII-XVII in FIG. 4, showing the state immediately after the push button is pressed. [Figure 18] 18 is a view corresponding to the XVIII-XVIII cross section of FIG. 5, showing a state in which rapid drug solution administration has been completed. [Figure 19] FIG. 10 is a perspective view showing a chemical liquid injection controller according to a second embodiment of the present invention, with the lower half of the housing removed. [Figure 20] 20 is a cross-sectional view of the chemical liquid injection controller shown in FIG. 19, showing a state in which the switch member is pressed in and the push button is not pressed in. FIG. [Figure 21] 21 is another cross-sectional view of the chemical liquid injection controller shown in FIG. 20. [Figure 22] 20 is a cross-sectional view of the liquid chemical injection controller shown in FIG. 19, showing a state in which the switch member is pressed and a state in which the push button is pressed. FIG. [Figure 23] 23 is another cross-sectional view of the chemical liquid injection controller shown in FIG. 22. DETAILED DESCRIPTION OF THE INVENTION

[0047] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0048] 1 and 2 show a liquid medicine administration device 12 equipped with a liquid medicine injection controller 10 according to a first embodiment of the present invention. The liquid medicine administration device 12 has a structure in which a liquid medicine container 14 and a liquid medicine administration port 16 are connected by a liquid medicine administration line 18.

[0049] The drug solution container 14 has a structure in which a main reservoir 22 is housed in a hard housing 20. The main reservoir 22 is a balloon formed of an elastic body such as rubber or a resin elastomer, and can store the drug solution in a pressurized state based on its elasticity by injecting the drug solution from a syringe (not shown) or the like connected to a drug solution injecting section 24. The drug solution stored in the main reservoir 22 is pushed out from the main reservoir 22 based on the elasticity of the main reservoir 22.

[0050] However, the specific structure of the drug solution container is not particularly limited. For example, the drug solution container may be configured to include a hard container body, a piston that is linearly movable within the container body, and a biasing means such as a coil spring that biases the piston in the moving direction, such that a main reservoir that stores the drug solution is configured between the container body and the piston, and the volume of the main reservoir gradually decreases as the piston moves due to the biasing force of the biasing means, thereby forcing the drug solution out of the main reservoir.

[0051] Furthermore, a drug solution administration line 18 is connected to the main reservoir 22 of the drug solution container 14, and the drug solution stored in the main reservoir 22 of the drug solution container 14 is delivered to the drug solution administration line 18. The drug solution administration line 18 is configured to include an upstream external line 26 and a downstream external line 28. A filter 30 that filters out foreign matter in the drug solution is provided in the middle of the upstream external line 26. Note that the filter 30 may include both a filter for removing foreign matter and a ventilation filter that discharges air out of the drug solution flow path.

[0052] Furthermore, the downstream end of the downstream external line 28 is connected to the liquid medicine administration port 16. This liquid medicine administration port 16 has a connector structure that can be connected to an indwelling needle (not shown) that is percutaneously placed in a patient's blood vessel or the like. Furthermore, in this embodiment, a cap 32 equipped with a breathable filter is attached to the liquid medicine administration port 16, which prevents the liquid medicine from leaking out of the liquid medicine administration port 16 and allows air to be discharged to the outside.

[0053] Furthermore, the upstream external line 26 and the downstream external line 28 are connected to a liquid medicine injection controller 10 as shown in Figures 3 to 13. The liquid medicine injection controller 10 is designed to perform rapid liquid medicine administration by self-operation, and has a structure in which a sub-reservoir 36 is housed and incorporated within a housing 34 as shown in Figures 6 to 12. In the following description of the liquid medicine injection controller 10, as a general rule, the up-down direction refers to the up-down direction in Figure 5, the front-rear direction refers to the left-right direction in Figure 4, which is the axial direction, and the left-right direction refers to the up-down direction in Figure 4.

[0054] More specifically, the housing 34 is formed of a hard synthetic resin or the like and has a hollow shape elongated in the front-to-rear direction as a whole, more specifically, a generally bottomed cylindrical shape. As shown in FIGS. 13 and 14 , the housing 34 has a flat, hollow cross-sectional shape over a wide area except for the rear end portion. In this embodiment, the housing 34 has a hollow, generally oval cross-sectional shape. As a result, the long axis direction, which is the longitudinal direction of the cross-section of the housing 34, corresponds to the up-down direction, and the short axis direction corresponds to the left-to-right direction. Note that the "flat" cross-sectional shape referred to here is not limited to an oval cross-section and may be, for example, a flat polygonal cross-section. That is, the cross-sectional shape of the housing 34 being "flat" refers to a cross-sectional shape with a directional characteristic, as if it were flattened in one direction. Typically, the inscribed circle or circumscribed circle in the cross-section is an ellipse, an ellipse, or a similar shape, so that the width dimensions in two perpendicular directions in the flat cross-section are different from each other, and the direction with the larger width dimension (the longitudinal direction) is referred to as the "longitudinal direction." Specifically, for example, in the case of a rectangular cross section in which the lengths of two pairs of opposite sides are different from each other, the direction of the long sides of the rectangle is the longitudinal direction or the long axis direction.

[0055] Two insertion holes 40, 42 are formed in the longitudinal direction of the wall on the front side (left side in FIG. 8) of the housing 34. Preferably, the housing 34 has an outer diameter dimension that allows it to be grasped by a user with one hand, and the outer circumferential surface is provided with a gripping surface 43 that is gripped by the user's hand. The housing 34 of this embodiment is configured by combining an upper half portion 44 and a lower half portion 46 in the vertical direction. Note that, to make it easier to see the internal structure of the chemical solution injection controller 10, the upper half portion 44 of the housing 34 is not shown in FIG. 6, and the lower half portion 46 of the housing 34 is not shown in FIG. 7.

[0056] The housing 34 also contains a sub-reservoir 36. The sub-reservoir 36 is formed by covering the opening of a cup-shaped diaphragm portion 48 with a base member 50, as shown in FIGS.

[0057] The diaphragm portion 48 is made of rubber, resin elastomer, or the like and is flexible, and is roughly cup-shaped when left in a stationary state where no external force is acting on it.A flange-shaped clamping portion 52 that protrudes to the outer periphery is integrally formed around the entire periphery of the opening portion.

[0058] The base member 50 is made of a hard synthetic resin or the like, has a generally circular disk shape, and is formed with a cylindrical drug solution inlet portion 54 and a drug solution outlet portion 56 that extend therethrough. Furthermore, the base member 50 has a plurality of locking projections 58 that protrude rearward (to the right in FIG. 8 ), and these locking projections 58 connect the base member 50 to the guide member 60.

[0059] The guide member 60 has a generally cylindrical shape and is provided with a flange-like locking portion 62 that protrudes outward from its front end. The locking projections 58 of the base member 50 are hooked onto the locking portion 62, thereby connecting the base member 50 and the guide member 60 in the axial direction. Furthermore, the locking portion 62 of the guide member 60 is provided with engaging hooks 64 at two locations in the circumferential direction. The engaging hooks 64 are integrally provided with a plate-shaped extending portion that extends rearward from the locking portion 62 and a claw portion that protrudes outward from the tip of the extending portion.

[0060] A diaphragm portion 48 is disposed on the inner periphery of this guide member 60. The diaphragm portion 48 is disposed on the inner periphery of the guide member 60, and is assembled to the base member 50 and the guide member 60 by having the clamping portion 52 sandwiched and supported between the base member 50 and the guide member 60 in the axial direction (front-to-back direction). In this assembled state, the opening of the diaphragm portion 48 is liquid-tightly sealed by the base member 50, thereby forming the sub-reservoir 36. Furthermore, the internal space of the sub-reservoir 36 is communicated with the inner cavities of a drug solution inlet portion 54 and a drug solution outlet portion 56, which pass through the base member 50.

[0061] The base member 50 and the guide member 60 are supported by the housing 34, so that the sub-reservoir 36 is positioned relative to the housing 34, and the diaphragm portion 48 is allowed to deform so that the bottom portion moves in the front-to-rear direction relative to the housing 34. The sub-reservoir 36 is located rearward of the center of the housing 34 in the front-to-rear direction.

[0062] In addition, a plunger 70 is placed on the bottom of the diaphragm portion 48. The plunger 70 has a structure in which a plunger main body 72 having a generally cylindrical shape with a bottom and a cylindrical guide tube portion 74 provided to surround the outer periphery of the plunger main body 72 are integrally connected at the rear end. The plunger main body 72 is formed with a recess 75 that opens rearward. The recess 75 extends linearly with a circular cross section that corresponds to the outer shape of a coil spring 90 (described later). The guide tube portion 74 is partially thin-walled at two locations on its circumference and expands toward the outer periphery, and these thin-walled portions form hook release portions 76, 76. The hook release portions 76, 76 are provided at positions in the circumferential direction corresponding to the engaging hooks 64, 64 of the guide member 60.

[0063] The plunger 70 is inserted into a push button 78, which serves as a pressing member. The push button 78 has a generally cylindrical shape with a bottom that opens forward. The opening is inserted into the rear end of the housing 34 from the axial rear side, and is assembled to be reciprocable in the longitudinal direction (front-to-back direction) of the housing 34. The bottom side of the push button 78 protrudes axially rearward from the rear end opening of the housing 34. The rear surface of the push button 78 exposed from the housing 34 serves as a pressing operation surface 79, which can be pressed by a fingertip and can be pressed with the thumb while gripping the grip surface 43 of the housing 34. Furthermore, a spring support portion 80 serving as a protrusion is integrally formed on the inner periphery of the bottom of the push button 78. The spring support portion 80 is a small-diameter cylinder with an outer shape corresponding to the inner shape of a coil spring 90 (described later), and protrudes forward from the center of the bottom wall of the push button 78. The outer diameter of the spring support portion 80 is smaller than the inner dimension of the recess 75. Furthermore, two axially extending hook engagement holes 82 are formed in the peripheral wall of the push button 78 at two circumferential locations. The tip of the hook release portion 76 of the plunger 70 is inserted into the hook engagement hole 82 and engaged with the inner peripheral surface of the hook engagement hole 82.

[0064] As shown in FIG. 7 , a driving piece 84 is integrally formed with the push button 78. The driving piece 84 protrudes forward from the open end of the push button 78 and extends to the outer periphery of the guide member 60. The protruding tip of the driving piece 84 is formed into two parallel sliding contact portions 86, 86, and the protruding tip surfaces of these sliding contact portions 86, 86 form an inclined surface 88 that slopes vertically toward the tip. In this embodiment, the inclined surface 88 is provided on the upper part of the sliding contact portion 86 and slopes downward toward the protruding tip, thereby giving the sliding contact portion 86 a tapered shape. The two sliding contact portions 86, 86 may have the same shape or different shapes.

[0065] 8 and 9, a coil spring 90 is disposed axially between the plunger 70 and the push button 78. The front end of the coil spring 90 is inserted into the inner periphery of the recess 75 of the plunger body 72, and the rear end is inserted around the spring support portion 80 that protrudes from the bottom wall portion of the push button 78, thereby positioning the coil spring 90 in the direction perpendicular to the axis. This allows the coil spring 90 to be stably held in a predetermined arrangement extending between the plunger body 72 and the push button 78 in the front-to-rear direction.

[0066] On the other hand, an inlet tube 92 serving as an upstream connector is connected to the base member 50. The inlet tube 92 is a soft member formed of rubber, resin elastomer, or the like. As shown in FIGS. 6 to 8 and 10 , the inlet tube 92 has an inlet port 93, which is a port for connecting to an external flow path, at its front end, and the inlet port 93 is fitted into the insertion hole 40 of the housing 34. The upstream external line 26 is fitted into the inlet port 93 of the inlet tube 92, and the rear end of the inlet tube 92 is fitted into the chemical solution inlet portion 54 of the base member 50. As a result, the upstream external line 26 and the sub-reservoir 36 are connected in a fluid communication state by the inlet tube 92.

[0067] 7 and 8, an orifice tube 94 serving as a restricting flow path is connected to the inflow tube 92. The orifice tube 94 is provided in parallel to the middle portion of the inflow tube 92 within the housing 34, and forms a bypass flow path connecting two locations that are separated in the flow direction of the inflow tube 92, upstream of the sub-reservoir 36. The portion of the inflow tube 92 between which the orifice tube 94 is connected forms a priming flow path 95 that extends in parallel with the orifice tube 94. The priming flow path 95 of this embodiment is provided on the inflow tube 92 that extends forward from the sub-reservoir 36, and extends linearly in the front-to-rear direction.

[0068] An outlet tube 96 serving as a downstream connector is connected to the base member 50. The outlet tube 96 extends in the front-to-rear direction as a whole. As shown in Figures 6 to 8 and 11, the outlet tube 96 includes a connection tube 98 connected to the drug solution outlet portion 56 of the base member 50, and an outlet port 100 connected in series to the connection tube 98 and serving as a port for connecting to an external flow path.

[0069] The connection tube 98 is a soft member made of rubber, resin elastomer, or the like, extends linearly in the axial direction, and is fitted in an externally inserted state around the chemical solution outflow portion 56 of the base member 50. The base member 50 is provided with a cylindrical seal retaining portion 102 that surrounds the periphery of the chemical solution outflow portion 56, and an annular seal member 104 is fitted between the connection tube 98 that is fitted around the chemical solution outflow portion 56 and the seal retaining portion 102, thereby pressing the connection tube 98 against the chemical solution outflow portion 56 and improving the sealing performance.

[0070] The outlet port 100 extends linearly in the axial direction, is fitted onto the front end of the connection tube 98, and is connected in series to the connection tube 98. The outlet port 100 is provided with a plate-shaped connection piece 106 extending in the direction perpendicular to the axis at its middle portion. The inlet tube 92, which is provided in parallel with the outlet tube 96, is fitted into a recess 108 of the connection piece 106 for positioning. The connection piece 106 is further provided with a cylindrical seal holding portion 110 that surrounds the rear end of the outlet port 100. An annular seal member 112 is fitted between the connection tube 98 fitted onto the outlet port 100 and the seal holding portion 110, thereby pressing the connection tube 98 against the outlet port 100 and improving sealing performance. The connection piece 106 is integrally formed with a locking protrusion 114 that serves as a restricting portion and protrudes forward between the inlet tube 92 and the outlet tube 96.

[0071] The outlet tube 96 is composed of a connecting tube 98 and an outlet port 100, and the front end of the outlet port 100 is inserted into the insertion hole 42 of the housing 34. The downstream external line 28 is fitted into the front end of the outlet port 100. Furthermore, the outlet tube 96 is fitted such that the rear end of the connecting tube 98 is fitted onto the chemical solution outlet portion 56 of the base member 50 in an externally inserted state.

[0072] In other words, a flow path arrangement space 115 is provided in front of the sub-reservoir 36. In this embodiment, the sub-reservoir 36 is disposed rearward of the center of the housing 34 in the front-to-rear direction, and therefore a large flow path arrangement space 115 is ensured. An inflow tube 92, which is a flow path on the inflow side of the medicinal liquid to the sub-reservoir 36, and an outflow tube 96, which is a flow path on the outflow side of the medicinal liquid to the sub-reservoir 36, are disposed in the flow path arrangement space 115. An orifice tube 94 and a priming flow path 95 that bypasses the orifice tube 94 are also disposed in the flow path arrangement space 115. The inflow tube 92 and the outflow tube 96, which include the priming flow path 95, are arranged side by side in the left-right direction of the housing 34, and are each arranged so as to generally follow the direction of movement of the push button 78.

[0073] The flow path arrangement space 115, the sub-reservoir 36, and the pressing operation surface 79 of the push button 78 are arranged in series in the longitudinal direction of the housing 34 (the left-right direction in FIG. 8), which is the direction of reciprocating movement of the push button 78. The inlet tube 92 and the outlet tube 96 extend substantially in the axial direction. The pressing operation surface 79 of the push button 78 extends in a direction substantially perpendicular to the axis.

[0074] 6 and 11, a rapid administration valve 116 is disposed above the middle portion of the outflow tube 96. The rapid administration valve 116 is inserted into a cylindrical valve guide portion 118 provided in the lower half portion 46 of the housing 34, and is assembled in a state in which relative displacement in the vertical direction with respect to the housing 34 is permitted. More specifically, as shown in FIGS. 11 to 13, the rapid administration valve 116 has a substantially disc-shaped valve main body 120 and a cylindrical spring guide portion 122 that protrudes upward, which are integrally formed. In addition, a pair of follower pieces 124, 124 that are inserted into the valve guide portion 118 are integrally formed from the valve main body 120 and protrude downward.

[0075] The valve body 120 has a flat clamp protrusion 126 that protrudes downward from the front-to-rear center portion and extends generally perpendicular to the front-to-rear direction, with the tip portion of the clamp protrusion 126 gradually becoming thinner toward the tip. Furthermore, the valve body 120 has a switch engagement protrusion 128 that protrudes outward from part of the circumferential direction (see Figure 6).

[0076] A coil spring 130 serving as a valve biasing means is inserted into the spring guide portion 122, and the coil spring 130 inserted into the spring guide portion 122 is compressed vertically between the valve body 120 and the upper half portion 44 of the housing 34. As a result, a downward biasing force from the coil spring 130 acts on the rapid administration valve 116.

[0077] 7 and 12, the follower piece 124 is shaped like a plate extending in the vertical direction, with its lower surface forming an inclined surface 132 that slopes upward toward the rear. A pair of follower pieces 124 are arranged a predetermined distance apart in the left-right direction, and a clamp protrusion 126 is provided between the base ends of the pair of follower pieces 124, 124. A portion of the outflow side tube 96 extends in the front-rear direction between the pair of follower pieces 124, 124, and the valve body 120 equipped with the clamp protrusion 126 is located above the outflow side tube 96.

[0078] 9, the valve body 120 of the rapid administration valve 116 is held above the outflow tube 96 against the biasing force of the coil spring 130 by vertically engaging the switch engagement protrusion 128 with an engagement receiving portion 144 (described below) integral with the switch member 134. The rapid administration valve 116 is disposed together with the outflow tube 96 in the flow path arrangement space 115. The rapid administration valve 116 is disposed to the side (above) of the outflow tube 96 and moves in an up-down direction perpendicular to the reciprocating direction of the push button 78, as described below. This allows the liquid injection controller 10 to be reduced in size in the front-to-back and left-to-right directions. The cross section of the portion of the housing 34 that accommodates the rapid administration valve 116 has a flat shape in which the width in the up-down direction is greater than the width in the left-to-right direction, which also ensures a sufficient stroke for the rapid administration valve 116 to move up and down.

[0079] As shown in Figures 3 to 5, the switch member 134 has a generally rectangular box shape overall, and is inserted into a switch insertion hole 138 provided in the upper half portion 44 of the housing 34. The switch member 134 is positioned relative to the housing 34 in the front-to-back and left-to-right directions, and is also movable relative to the housing 34 in the up-and-down direction.

[0080] Furthermore, the switch member 134 is provided with a shut-off valve 140. The shut-off valve 140 is disposed in the flow path arrangement space 115 of the housing 34. The shut-off valve 140 is provided with a plate-shaped valve element 141 that protrudes downward. The valve element 141 extends approximately perpendicular to the front-to-rear direction, which is the length direction of the priming flow path 95. This valve element 141 is disposed between both ends of the orifice tube 94 in the front-to-rear direction. In other words, the orifice tube 94 is disposed so as to connect the upstream side and downstream side of the portion of the sub-line 160 (described later) where the valve element 141 is disposed.

[0081] Furthermore, in the initial state before the switch member 134 is pushed in, the valve element 141 is disposed above the inflow tube 92, and the lumen of the inflow tube 92 is kept in communication without being crushed by the valve element 141 of the shut-off valve 140. The shut-off valve 140 is disposed to the side (above) of the inflow tube 92, and moves downward in a vertical direction perpendicular to the direction of reciprocating movement of the push button 78, as will be described later. This allows the chemical liquid injection controller 10 to be made smaller in the front-to-rear and left-to-right directions. The portion of the housing 34 that accommodates the shut-off valve 140 has a cross section perpendicular to the front-to-rear direction that is flattened such that the width dimension in the vertical direction is greater than the width dimension in the left-to-right direction, which also ensures a sufficient movement stroke of the shut-off valve 140 as it moves up and down.

[0082] Furthermore, an inclined abutment edge 142 that forms the underside of the valve disc 141 is disposed opposite the upper side of the inlet-side tube 92, and the inclined abutment edge 142 is an inclined surface that slopes downward from right to left in Figure 13. It is desirable that the inclined abutment edge 142 be set at an angle of inclination within a range of 10 to 80° with respect to the up-down direction in Figure 13, which is the direction of movement of the valve disc 141. Furthermore, the stop valve 140 is provided with an engagement receiving portion 144 that protrudes in the left-right direction and that engages with the switch engagement protrusion 128 of the rapid administration valve 116 in the up-down direction.

[0083] The lower half 46 of the housing 34 is provided with a tube support portion 145 that protrudes upward in a portion that faces the shut-off valve 140 in the vertical direction. This tube support portion 145 abuts against and supports a portion of the inlet-side tube 92 from below. Furthermore, the tube support portion 145 has a recess 146 that opens upward in a central portion in the front-to-rear direction that corresponds to the shut-off valve 140.

[0084] 7, the inlet port 93 of the inlet tube 92 and the outlet port 100 of the outlet tube 96 are connected by a flow control tube 148 serving as a flow rate control section. The flow control tube 148 is a flexible tube made of rubber, resin elastomer, or the like, and has a smaller diameter than the inlet tube 92 and the outlet tube 96. The front end of the flow control tube 148 is inserted into a cylindrical connecting portion 150 provided in the inlet port 93 and communicates with the inlet port 93, and the rear end of the flow control tube 148 is inserted into a cylindrical connecting portion 152 provided in the outlet port 100 and communicates with the outlet port 100. As a result, the flow control tube 148 forms a connecting flow path connecting the inlet port 93 and the outlet port 100. In this embodiment, the connecting flow path formed by the flow control tube 148 has a substantially constant flow path diameter throughout, and the entire connecting flow path is used as a flow control section. However, for example, the connecting flow path may be made to have a smaller diameter in some parts, so that the flow control section is provided partially for the connecting flow path.

[0085] The connecting portions 150, 152 are provided forward of the connecting piece 106 of the outlet tube 96, and both ends of the flow rate control tube 148 are connected to either the inlet port 93 constituting the front portion of the inlet tube 92 or the outlet port 100 constituting the front portion of the outlet tube 96. The connecting portions 150, 152 branch downward from the inlet port 93 and the outlet port 100, and extend downward in the longitudinal direction of the cross section of the housing 34. As a result, the connecting portions 150, 152 and the flow rate control tube 148 are arranged to extend in the longitudinal direction of the cross section, which allows for ample space to be secured within the housing 34, and are accommodated in the housing 34 with efficient space-saving arrangement.

[0086] Furthermore, the flow control tube 148 is located farther from the push button 78 than the orifice tube 94, the priming flow path 95, and the shut-off valve 140. In other words, the flow control tube 148 is located away from the push button 78 in the front-to-rear direction of the housing 34 relative to the orifice tube 94, the priming flow path 95, and the shut-off valve 140. This allows the flow control tube 148 to be located away from actuating members that move relative to the housing 34, such as the shut-off valve 140 and the push button 78, making it less likely that interference will occur between the flow control tube 148 and the actuating members. This makes it possible to prevent the flexible, small-diameter flow control tube 148 from being damaged by contact with the actuating members.

[0087] In this embodiment, the upstream end of the flow control tube 148 is inserted into the base end portion of the connecting portion 150 and is connected to the inlet port 93 and a branching point 154 of the connecting portion 150. Furthermore, the downstream end of the flow control tube 148 is inserted into the base end portion of the connecting portion 152 and is connected to the outlet port 100 and a junction 156 of the connecting portion 152. Note that when the flow control tube 148 is connected to the branching point 154 and the junction 156, it is desirable that both end openings of the flow control tube 148 be arranged so as to be directly connected to the branching point 154 and the junction 156. However, the flow control tube 148 may be arranged in proximity to the branching point 154 and the junction 156 and indirectly connected to the branching point 154 and the junction 156 via the connecting portions 150, 152. When both end openings of the flow control tube 148 are connected close to the branch point 154 and the junction 156, it is desirable that both ends of the flow control tube 148 be inserted into the base ends of the connecting parts 150, 152 to a position where air remaining in the lumen of the connecting parts 150, 152 after priming, which will be described later, does not become a problem. More specifically, for example, both ends of the flow control tube 148 are arranged close to the branch point 154 and the junction 156 so that the volume of the region in the lumen of the connecting parts 150, 152 from the base ends of the connecting parts 150, 152 to the end of the flow control tube 148 is 3 ml or less, preferably 1 ml or less.

[0088] Furthermore, the flow control tube 148 is generally U-shaped, extends downward from the connecting portions 150, 152, and wraps around and extends below the latching projection 114 protruding from the connecting piece 106. As a result, the entire flow control tube 148 is housed within the housing 34, with at least the middle portion curved circumferentially around the housing 34. By arranging the flow control tube 148 so that it curves circumferentially around the housing 34, the flow control tube 148 can be efficiently housed within the housing 34 and bending of the flow control tube 148 is less likely to be a problem. The length of the flow control tube 148 is set according to the required flow rate per unit time of the main line 158 (described below). If the flow control tube 148 is long, the flow control tube 148 can also be held by wrapping it around the latching projection 114.

[0089] The drug solution injection controller 10 having such a structure forms a drug solution administration device 12 by connecting an upstream external line 26 to the inlet port 93 and connecting a downstream external line 28 to the outlet port 100.

[0090] Furthermore, in chemical solution injection controller 10, inflow port 93 and outflow port 100 are connected by flow control tube 148, thereby forming main line 158 of chemical solution administration device 12 that connects main reservoir 22 and chemical solution administration port 16. That is, main line 158 of chemical solution administration device 12 is made up of upstream external line 26 connected to main reservoir 22, inflow port 93 connected to upstream external line 26, flow control tube 148 connected to inflow port 93, outflow port 100 to which flow control tube 148 is connected, and downstream external line 28 connected to outflow port 100. Since inflow port 93 and outflow port 100 are connected by flow control tube 148, main line 158 is configured without including sub-reservoir 36 on its path. Therefore, the medicinal liquid stored in the main reservoir 22 can be continuously administered from the medicinal liquid administration port 16 through the main line 158 without passing through the sub-reservoir 36. Note that although the main line 158 in this embodiment is always in communication, it can also be temporarily blocked by, for example, appropriately clamping the external lines 26, 28.

[0091] Meanwhile, a sub-line 160 of the medicinal solution administration device 12 is configured by a portion of the inflow side tube 92 downstream of the connection portion 150, the orifice tube 94 connected to the inflow side tube 92, and a portion of the outflow side tube 96 upstream of the connection portion 152. This sub-line 160 branches off from the main line 158 at a branch point 154 between the inflow side tube 92 and the connection portion 150, and passes through the sub-reservoir 36 to merge with the main line 158 at a junction 156 between the outflow side tube 96 and the connection portion 152. In this embodiment, the entire sub-line 160 is incorporated in a housed state in the housing 34, and the branch point 154 and the junction point 156 of the main line 158 and the sub-line 160 are incorporated in a housed state in the housing 34.

[0092] The drug solution administration line 18 connecting the main reservoir 22 and the drug solution administration port 16 includes a main line 158 and a sub-line 160. An upstream external line 26 is provided connecting the main reservoir 22 and the drug solution injection controller 10, and a downstream external line 28 is provided connecting the drug solution injection controller 10 and the drug solution administration port 16.

[0093] Before use, the chemical solution administration device 12 equipped with the chemical solution injection controller 10 configured as described above undergoes priming, in which the main line 158 and the sub-line 160 are filled with a chemical solution (priming solution). That is, in the initial state of the chemical solution injection controller 10, in which the switch member 134 and the push button 78 are not pressed, the chemical solution is sent from the main reservoir 22 to the chemical solution administration line 18, filling the upstream external line 26, the inlet tube 92, the sub-reservoir 36, the outlet tube 96, and the downstream external line 28 with the chemical solution. Air pushed downstream by the chemical solution is then discharged to the outside through the cap 32 of the chemical solution administration port 16. As described above, in this embodiment, air is also discharged to the outside through the filter 30 provided in the upstream external line 26. This completes the priming of the main line 158 and the sub-line 160, except for the orifice tube 94 and the flow control tube 148, which are small in diameter and thus difficult for the chemical solution to flow through.

[0094] During priming, the shut-off valve 140 is in an open state and the priming flow path 95 of the inlet side tube 92 is in a connected state, so that the chemical solution flows through the priming flow path 95, and the priming of the main line 158 and the sub-line 160 is quickly completed.

[0095] Note that the orifice tube 94 and the flow control tube 148 have extremely small lumen volumes, and the amount of air remaining therein is so small that it is practically negligible, making it unnecessary to expel air by priming. In this embodiment, the upstream end of the flow control tube 148 is inserted into the base end of the connecting part 150 and connected to the branch point 154 of the main line 158 and the sub-line 160, and the downstream end of the flow control tube 148 is inserted into the base end of the connecting part 152 and connected to the junction 156 of the main line 158 and the sub-line 160. This prevents air from remaining between the branch point 154 and the upstream end of the flow control tube 148 and between the downstream end of the flow control tube 148 and the junction 156, making the amount of air remaining in the drug solution administration line 18 after priming is complete so small that it is negligible.

[0096] After priming is completed, by pressing switch member 134 downward, valve element 141 of shutoff valve 140, which is integral with switch member 134, moves downward as shown in Figure 14, and inclined abutment edge 142 of valve element 141 is pressed against priming flow path 95 of inflow side tube 92 in a direction perpendicular to the flow path of priming flow path 95. As a result, inflow side tube 92 is crushed at the middle portion (priming flow path 95) against which valve element 141 of shutoff valve 140 is pressed, and inflow side tube 92 is blocked at the priming flow path 95 pressed by shutoff valve 140. Furthermore, inflow side tube 92, the upstream and downstream sides of the portion of priming flow path 95 blocked by shutoff valve 140 are connected by orifice tube 94. Therefore, when the priming flow path 95 of the inlet tube 92 is blocked by the shut-off valve 140, the sub-line 160 is maintained in a connected state from the branch point 154 to the sub-reservoir 36 by the orifice tube 94, and the flow rate of the medicinal liquid per unit time is limited by the orifice tube 94.

[0097] In the shut-off valve 140 of this embodiment, the portion that comes into contact with the inlet tube 92 is an inclined contact edge 142, so when the shut-off valve 140 is pressed against the inlet tube 92 and the inlet tube 92 is crushed, the repulsive force due to the elasticity of the inlet tube 92 acts not only in the vertical direction but also in the horizontal direction. As a result, the repulsive force in the vertical direction is smaller than when the repulsive force acts only in the vertical direction, and the downward force applied to the switch member 134 to press down the shut-off valve 140 can be reduced.

[0098] Moreover, in this embodiment, when the shut-off valve 140 is in the open state, the inclined abutment edge 142 abuts against the outer peripheral surface of the inlet-side tube 92, and the lower end of the inclined abutment edge 142 is located below the abutment portion with the inlet-side tube 92. Therefore, the effect exerted by the shut-off valve 140 being pressed against the inlet-side tube 92 at the inclined abutment edge 142 can be obtained more stably.

[0099] Furthermore, since the inlet tube 92 after being crushed by the shut-off valve 140 is compressed in the left-right direction between the side surface of the shut-off valve 140 and the housing 34, the repulsive force due to the elasticity of the inlet tube 92 is unlikely to act upward on the shut-off valve 140. Therefore, the shut-off valve 140 is stably held in the closed state, and the inlet tube 92, and therefore the sub-line 160, are stably maintained in a blocked state.

[0100] Furthermore, as the switch member 134 moves downward, the engagement between the engagement receiving portion 144 of the switch member 134 and the switch engagement protrusion 128 of the rapid administration valve 116 is released, allowing the rapid administration valve 116 to move downward. As a result, the rapid administration valve 116 moves downward due to the biasing force of the coil spring 130, and the clamp protrusion 126 of the rapid administration valve 116 is pressed against the connection tube 98 of the outflow tube 96 in a direction perpendicular to the flow path of the outflow tube 96. As a result, the outflow tube 96 is partially crushed by the rapid administration valve 116, and the lumen of the outflow tube 96 pressed by the rapid administration valve 116 is blocked, and the outflow of the medicinal solution from the sub-reservoir 36 is prevented by blocking the outflow tube 96.

[0101] As shown in FIG. 13, when the switch member 134 is pushed downward, the downwardly protruding locking piece 161 is locked by the tube support portion 145 of the housing 34, so that the switch member 134 is held in the pushed-in state and does not return upward.

[0102] On the other hand, with switch member 134 depressed, main line 158 is maintained in a connected state. Then, cap 32 is removed from medicinal solution administration port 16 connected to main line 158, and medicinal solution administration port 16 is connected to an indwelling needle or the like placed in the patient's blood vessel. As a result, the medicinal solution sent from main reservoir 22 to main line 158 is sent to medicinal solution administration port 16 without passing through sub-line 160, and is continuously administered in small amounts into the patient's body via an indwelling needle or the like (not shown).

[0103] The amount of medicinal liquid administered per unit time into the patient's body through the main line 158 is adjusted by restricting the flow rate of the main line 158 with the flow control tube 148. That is, by increasing the length of the flow control tube 148, the administered amount per unit time can be set to be small, and by shortening the length of the flow control tube 148, the administered amount per unit time can be set to be large.

[0104] Next, when a patient wishes to perform a rapid administration to temporarily increase the amount of medicinal liquid administered, the patient performs a self-injection operation by pressing the push button 78 on the medicinal liquid injection controller 10. When the push button 78 is pressed by the patient, as shown in FIGS. 15 and 16 , the coil spring 90 is compressed between the push button 78 and the plunger 70. This causes a forward biasing force to be applied to the plunger 70 based on the elasticity of the compressed coil spring 90. Note that as the push button 78 is pressed forward, the engagement hook 64 of the guide member 60 axially engages with the inner circumferential surface of the hook engagement hole 82 of the push button 78, so that the push button 78 is held in the pressed position against the biasing force of the coil spring 90. Therefore, the biasing force of the coil spring 90 is efficiently applied to the plunger 70.

[0105] Furthermore, when the push button 78 is pushed forward, the inclined surface 88 of the driving piece 84 formed integrally with the push button 78 is pressed against the inclined surface 132 of the follower piece 124 formed integrally with the rapid administration valve 116. These inclined surfaces 88, 132 convert the forward force applied to the push button 78 into an upward force which is applied to the rapid administration valve 116. As a result, the rapid administration valve 116 moves upward against the biasing force of the coil spring 130, and as shown in Figures 16 and 17, the blockage of the outflow tube 96 by the rapid administration valve 116 is released. Note that it is not essential to provide the inclined surfaces 88, 132 on both the driving piece 84 and the follower piece 124, as long as the movement of the driving piece 84 is redirected and transmitted to the movement of the follower piece 124.

[0106] Furthermore, with the outflow tube 96 in communication, the plunger 70 is pressed against the diaphragm portion 48 of the sub-reservoir 36 by the biasing force of the coil spring 90, and the bottom of the diaphragm portion 48 is pushed forward, as shown in FIG. 18 . As a result, the internal pressure of the sub-reservoir 36 compressed by the plunger 70 increases, and the medicinal liquid stored in the sub-reservoir 36 is injected into the main line 158 via the outflow tube 96. This temporarily increases the amount of medicinal liquid administered into the patient's body from the medicinal liquid administration port 16. Note that because the inflow tube 92 is kept in a closed state by the shut-off valve 140 and the lumen of the orifice tube 94 has an extremely small diameter, when the internal pressure of the sub-reservoir 36 increases, the medicinal liquid in the sub-reservoir 36 is sent to the outflow tube 96 without flowing back into the inflow tube 92.

[0107] The liquid injection controller 10 is configured so that once the push button 78 is pressed, the push button 78 remains in the pressed position. Therefore, a single pressing operation will result in the administration of substantially the entire amount of liquid medicine stored in the sub-reservoir 36. This allows the patient using the liquid injection controller 10 to rapidly administer a sufficient amount of liquid medicine with a single push, without having to continue pressing the push button 78. When the push button 78 is pressed, the spring support portion 80 is inserted into the recess 75 of the plunger 70. This ensures a sufficient stroke for the pressing operation of the push button 78 without increasing the size of the liquid injection controller 10 in the front-to-rear direction.

[0108] 18, when the rapid administration of the medicinal liquid is completed, hook release portion 76 of plunger 70, which has moved forward, abuts against engaging hook 64 of guide member 60, bending engaging hook 64 inward to the left and right. This disengages engaging hook 64 from the inner circumferential surface of hook engaging hole 82 of push button 78, allowing push button 78 to move rearward relative to housing 34. Furthermore, rearward movement of push button 78 is allowed, and push button 78 moves rearward based on the elasticity of coil spring 90, thereby releasing the biasing force of coil spring 90 acting on plunger 70.

[0109] When the push button 78 moves further rearward, the driving piece 84 formed integrally with the push button 78 is released from contact with the driven piece 124 formed integrally with the rapid administration valve 116. As a result, the clamp projection 126 of the rapid administration valve 116 is pressed against the outflow tube 96 by the biasing force of the coil spring 130, and the outflow tube 96 is switched to the shutoff state by the rapid administration valve 116.

[0110] Furthermore, a portion of the medicinal liquid delivered from the main reservoir 22 to the external line 26 on the upstream side is filled into the sub-reservoir 36 through the inlet tube 92 and the orifice tube 94. This gradually increases the amount of medicinal liquid in the sub-reservoir 36 that was reduced by the rapid administration. Note that, because the biasing force of the coil spring 90 is released from the plunger 70 that pressed against the diaphragm portion 48 of the sub-reservoir 36 during rapid administration, the deformation of the diaphragm portion 48 is not significantly hindered, and the filling of the medicinal liquid into the sub-reservoir 36 accompanied by the deformation of the diaphragm portion 48 is permitted.

[0111] Furthermore, as the amount of medicinal liquid in the sub-reservoir 36 increases, the plunger 70 is pushed backward by the diaphragm portion 48. Then, the sub-reservoir 36 is filled with substantially the same amount of medicinal liquid as before the rapid administration, causing the plunger 70 to move to its initial position. Furthermore, as the plunger 70 moves backward, the push button 78 is moved backward by the biasing force of the coil spring 90, and the push button 78, like the plunger 70, is moved to its initial position.

[0112] Because the orifice tube 94 constitutes a portion of the flow path supplying the medicinal liquid to the sub-reservoir 36, the amount of medicinal liquid that accumulates in the sub-reservoir 36 after rapid administration of the medicinal liquid is limited, and a predetermined time is required for the sub-reservoir 36 to fill to an amount that can be administered. This prevents rapid administration of the medicinal liquid from being repeatedly performed in a short period of time, thereby preventing overadministration of the medicinal liquid. The refill time until rapid administration of the medicinal liquid is again possible can be set by the flow rate of the orifice tube 94. In other words, if the flow rate of the medicinal liquid flowing through the orifice tube 94 is low, it takes time for the medicinal liquid to accumulate in the sub-reservoir 36, and the time interval between rapid administrations becomes longer. The flow rate of the orifice tube 94 can also be adjusted by the inner diameter and length of the orifice tube 94. Generally, the flow rate decreases as the inner diameter decreases, and the flow rate decreases as the length increases.

[0113] 4, the peripheral wall of the housing 34 is provided with a slit 162 extending in the axial direction, and a protruding mark 164 provided on the plunger 70 is inserted into the slit 162, so that the relative axial position of the plunger 70 with respect to the housing 34 can be grasped from the outside. In short, the state in which the mark 164 has moved to the vicinity of the rear end of the slit 162 indicates that the sub-reservoir 36 is filled with the medicinal liquid.

[0114] The drug solution injection controller 10 having such a structure according to this embodiment can be easily installed in the drug solution administration device 12 by connecting the upstream external line 26 that constitutes the main line 158 to the inlet port 93 and connecting the downstream external line 28 to the outlet port 100.

[0115] Furthermore, flow rate control tube 148, which serves as a flow rate control section constituting main line 158, is provided in liquid injection controller 10, and liquid injection controller 10 is configured to include a portion of main line 158 and the entire sub-line 160. Therefore, by employing liquid injection controller 10, sub-line 160 and flow rate control tube 148 can be easily provided in liquid administration device 12.

[0116] Furthermore, since the flow rate control tube 148 is provided in the chemical solution injection controller 10, the configuration of the upstream external line 26 can be simplified compared to when the flow rate control tube 148 is provided midway along the upstream external line 26. In particular, in this embodiment, the chemical solution injection controller 10 is provided with a rigid housing 34, and the flow rate control tube 148 is incorporated into the housing while being housed therein. Therefore, compared to when the flow rate control tube 148 is exposed to the outside, the upstream external line 26 is easier to handle, and the flow rate control tube 148 is protected by the housing 34.

[0117] Furthermore, because the flow control section is made up of a small-diameter flow control tube 148, the flow control section that adjusts the flow rate of the main line 158 has a simple structure. Moreover, because the hooking protrusions 114 are provided around which the flow control tube 148 can be wound and held, for example, when the flow control tube 148 is long, the flow control tube 148 can be wound around the hooking protrusions 114 to stably hold the flow control tube 148 and prevent it from interfering with other components.

[0118] Furthermore, in this embodiment, the branch point 154 and the junction point 156 of the main line 158 and the sub-line 160 are provided in the chemical solution injection controller 10, which simplifies the configuration of the external lines 26, 28 compared to when the branch point 154 and the junction point 156 are provided midway along the external lines 26, 28. In particular, in this embodiment, the branch point 154 and the junction point 156 are incorporated and housed in the housing 34, which makes it easier to handle the external lines 26, 28 compared to when the branch point 154 and the junction point 156 are exposed to the outside, and also prevents unintended external force from being applied to the branch point 154 and the junction point 156.

[0119] Furthermore, the priming flow path 95 extends linearly in the front-to-rear direction, and the orifice tube 94, which is provided in parallel with the priming flow path 95, is provided below the priming flow path 95. This allows the priming flow path 95, which has a larger diameter than the orifice tube 94, to be provided with a simple structure, and also prevents the large-diameter priming flow path 95 from extending to the side, thereby increasing the diameter of the housing 34. Furthermore, even if the small-diameter orifice tube 94 is located to the side (below) of the priming flow path 95, an increase in the size of the housing 34 is unlikely to be a problem. Moreover, because the orifice tube 94 has a small diameter and is flexible, it can easily be arranged to extend along a curved path.

[0120] 19 shows a chemical liquid injection controller 170 according to a second embodiment of the present invention with the lower half (46) of the housing 34 removed. In the following description, the same reference numerals are used in the drawings to designate components and parts that are substantially the same as those in the first embodiment, and description thereof will be omitted.

[0121] 20 and 21, the chemical liquid injection controller 170 includes a push button 172 as a pressing operation member that protrudes rearward (to the right in FIG. 20) from the housing 34. As shown in FIGS. 19 and 21, unlike the push button 78 of the first embodiment, this push button 172 does not include a driving piece 84 and has a generally cylindrical shape with a bottom.

[0122] 19 and 21, a driving member 174 is disposed in the lower part of the housing 34. The driving member 174 has a structure in which two sliding contact portions 86, 86 arranged in parallel are connected to each other at their base ends (rear ends). The tip ends (front end faces) of the sliding contact portions 86, 86 each have an inclined surface 88 that slopes downward toward the tip. The driving member 174 also has a contact protrusion 176 that protrudes rearward. The driving member 174 also has an elastic piece 178 that extends forward. The elastic piece 178 is plate-shaped, curved in the thickness direction, slopes upward as it extends forward, and is elastically deformable in the thickness direction.

[0123] The driving member 174 is reciprocatable in the front-to-rear direction along the inner surface of the lower wall of the housing 34. When the push button 172 is not pressed in and is in the injection standby state shown in Figures 20 and 21, the sliding contact portions 86, 86 of the driving member 174 are spaced rearward from the driven piece 124 formed integrally with the rapid administration valve 116, and the abutting protrusion 176 is spaced forward from the push button 172.

[0124] In addition, in the above-mentioned standby state for injection, the elastic piece 178 abuts against the valve guide portion 118 of the housing 34, and the forward displacement of the driving member 174 is restricted by the elastic piece 178. Furthermore, in this embodiment, a step 180 is formed on the inner surface of the lower wall of the housing 34, and the rearward displacement of the driving member 174 is restricted by the abutment against the step 180.

[0125] When the user presses the push button 172, as shown in Figure 22, the front end of the push button 172 moves forward and abuts against the abutment protrusion 176 of the driving member 174, causing the driving member 174 to be pushed forward by the push button 172. The pushed-in driving member 174 moves forward against the elastic force of the elastic pieces 178, and the inclined surfaces 88, 88 of the sliding contact portions 86, 86 are pressed against the inclined surfaces 132, 132 of the driven pieces 124, 124. This causes the driven pieces 124, 124 to be pushed upward, and the rapid administration valve 116 formed integrally with the driven pieces 124, 124 to be pushed upward. As a result, as shown in Figure 23, the connection tube 98, which had been crushed and blocked by the rapid administration valve 116, is switched to a communicating state by the displacement of the rapid administration valve 116, and the medicinal liquid stored in the sub-reservoir 36 is rapidly administered through the connection tube 98.

[0126] After the rapid administration of the liquid medicine is completed, as the push button 172 moves rearward due to the biasing force of the coil spring 90, the driving member 174 moves rearward based on the elasticity of the elastic piece 178. As a result, the rapid administration valve 116 moves downward due to the biasing force of the coil spring 130, and the rapid administration valve 116 again closes the connecting tube 98. The driving member 174 moving rearward may abut against a step 180 in the housing 34, or may stop at a position spaced forward from the step 180. Furthermore, if the driving member 174 is pushed rearward by utilizing the movement of the rapid administration valve 116 due to the biasing force of the coil spring 130, the elastic piece 178 may not be provided.

[0127] In this embodiment, the drive member 174, which includes the sliding contact portions 86, 86, is separate from the push button 172, so that the push button 172 and the drive member 174 can be attached separately to the housing 34. This facilitates the assembly of the push button 172 and the drive member 174 to the housing 34. Furthermore, because the push button 172 and the drive member 174 are separated from each other in the injection standby state, there is a greater tolerance for dimensional errors in the parts compared to the structure in which the push button 78 and the drive piece 84 are integrally connected as in the first embodiment, and assembly defects of the push button 172 and the drive member 174 are less likely to occur.

[0128] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific descriptions. For example, the flow control section is not limited to a small-diameter tube such as the flow control tube 148 shown in the above embodiment, but may instead be configured, for example, by stacking plate members, with the flow rate of the chemical liquid being regulated by a thin flow path formed between the stacked plate members. Note that, as with the flow control section, a different structure may also be employed for the flow path restriction formed by the orifice tube 94 in the above embodiment.

[0129] In the above embodiment, a structure in which flow control tube 148 is incorporated and housed in housing 34 has been exemplified. However, for example, inlet port 93 and outlet port 100 may be extended forward beyond housing 34, and flow control tube 148 connecting inlet port 93 and outlet port 100 may be provided on the front, outer side of housing 34. In this case, branch point 154 and junction 156 of main line 158 and sub-line 160 are located outside housing 34, so that main line 158 is entirely provided outside housing 34, and part of sub-line 160 is also provided outside housing 34. In this way, flow control tube 148 as a flow control section may be disposed outside flow path arrangement space 115 within housing 34. In other words, being provided in liquid injection controller 10 does not necessarily mean being incorporated and housed in housing 34 of liquid injection controller 10.

[0130] Furthermore, when the flow rate control section is provided outside the housing 34, the confluence 156 of the main line 158 and the sub-line 160 can be provided inside the housing 34. In this case, an external flow path on the inlet side of the main line 158, an external flow path on the inlet side of the sub-line 160, and an external flow path on the outlet side of the main line 158 are connected to the chemical solution injection controller.

[0131] In addition, in the above embodiment, a structure was exemplified in which both ends of the flow control tube 148 were inserted up to the base ends of the connecting parts 150, 152 and connected to the branching point 154 and the junction point 156 of the main line 158 and the sub-line 160, but for example, the flow control tube 148 can also be inserted into the opening part so as not to reach the base ends of the connecting parts 150, 152, and configured to indirectly connect the branching point 154 and the junction point 156 via the connecting parts 150, 152.

[0132] In the above embodiment, the upstream external line 26 is inserted into the inlet port 93 of the inlet tube 92 and connected thereto, and the downstream external line 28 is inserted into the outlet port 100 of the outlet tube 96 and connected thereto, such that the external lines 26, 28 and the inlet tube 92 and outlet tube 96 are independent members. However, the upstream external line 26 and the inlet tube 92 can be configured as a continuous, integrated tube, and the downstream external line 28 and the outlet tube 96 can be configured as a continuous, integrated tube. As can be seen from this, the inlet port 93 and the outlet port 100 are not necessarily limited to a structure in which independent lines are inserted, but refer to both ends of the portion of the main line 158 that is provided in the chemical liquid injection controller 10.

[0133] In the above embodiment, the inlet tube 92 and the outlet tube 96 are arranged side by side in the left-right direction perpendicular to the longitudinal axis direction of the cross section of the housing 34. However, the inlet tube 92 and the outlet tube 96 may be arranged side by side, for example, in the longitudinal axis direction (up-down direction) of the cross section of the housing 34. It goes without saying that the inlet port 93 and the outlet port 100 may also be arranged side by side in the longitudinal axis direction of the cross section of the housing 34. Furthermore, the external lines 26, 28 extend forward from the front wall portion of the housing 34 located opposite the pressing operation surface 79, thereby preventing the flow paths within the housing 34 from becoming complicated. However, the external lines 26, 28 may also extend from the pressing operation surface 79 side (rear side) of the housing 34 by adding a member to the inside to prevent kinking, for example. [Explanation of symbols]

[0134] 10, 170: chemical solution injection controller, 12: chemical solution administration device, 16: chemical solution administration port, 22: main reservoir, 34: housing, 36: sub-reservoir, 43: gripping surface, 70: plunger, 75: recess, 78, 172: push button (pressing operation member), 79: pressing operation surface (fingertip pressing surface), 80: spring support part (protrusion), 90: coil spring, 92: inlet side tube (inlet side flow path), 93: inlet side port (external port for connecting a flow path), 94: orifice tube (restricted flow path), 95: priming flow path, 96: outlet tube (flow path on the outlet side), 100: outlet port (port for connecting an external flow path), 114: latching protrusion (restriction portion), 115: flow path arrangement space, 116: rapid administration valve, 140: shut-off valve, 141: valve body, 142: inclined abutment side, 148: flow rate control tube (flow rate control portion, connecting flow path), 158: main line, 160: sub-line

Claims

1. A drug solution injection controller, comprising: a sub-reservoir housed in a housing and connected via a sub-line to a main line for continuous drug solution administration; and the controller enabling rapid administration of drug solution from the sub-reservoir by self-operation, the device comprises a pressing member that is pressed when rapid administration of a medicinal solution is to be performed; a rapid administration valve that is a member separate from the pressing member and that switches a flow path on the medicinal solution outflow side from the sub-reservoir between a connected state and a blocked state; valve biasing means that biases the rapid administration valve from the connected state to the blocked state; a restriction flow path and a priming flow path that are provided in parallel in the flow path on the medicinal solution inflow side to the sub-reservoir in the sub-line; and a switch member that has a shut-off valve that blocks the priming flow path, By operating the switch member, the priming flow path is shut off and the rapid administration valve is permitted to move, so that the flow path on the drug solution outflow side is shut off by the valve biasing means, A pressing force applied to the pressing member is applied to the rapid administration valve, causing the rapid administration valve to switch from a shut-off state to a communicating state against the valve biasing means. Chemical injection controller.

2. The switch member and the rapid administration valve are movable in the same direction in the housing, and the switch member and the rapid administration valve are provided with opposing surfaces that are close to each other and can move relatively. The chemical liquid injection controller according to claim 1 .

3. A switch member constituting the shut-off valve is provided penetrating the peripheral wall of the housing from the inside to the outside, and a tip surface of the switch member for pressing that protrudes from the housing and a portion of the shut-off valve that blocks the priming flow path overlap in the direction of movement of the switch member when pressed. The chemical liquid injection controller according to claim 1 or 2.

4. a flow rate control section provided in the housing, the flow rate control section connecting a drug solution inflow channel and a drug solution outflow channel to the sub-reservoir, and enabling continuous drug solution administration without passing through the sub-reservoir; the flow path on the chemical liquid inlet side and the flow path on the chemical liquid outlet side are provided in parallel, Both end portions of the flow control section are inserted into cylindrical branch port sections that protrude from the flow path on the inflow side of the chemical liquid and the flow path on the outflow side in directions intersecting the length direction of the flow paths and are arranged in parallel to each other, and are connected to the flow path on the inflow side of the chemical liquid and the flow path on the outflow side of the chemical liquid. The chemical liquid injection controller according to claim 1 or 2.

5. the sub-line has a flow path on a drug solution inlet side and a flow path on a drug solution outlet side relative to the sub-reservoir, The flow path on the chemical solution inlet side has a tubular connecting portion that protrudes and branches in a direction intersecting the flow path length direction, and the connecting portion is positioned relative to the housing. The chemical liquid injection controller according to claim 1 or 2.

6. The direction of movement of the switch member is perpendicular to the direction of movement of the pressing operation member. The chemical liquid injection controller according to claim 1 or 2.

7. In a plan view seen from the direction of movement of the switch member, the switch member is positioned away from the central axis of the housing. The chemical liquid injection controller according to claim 1 or 2.

8. the stop valve has an inclined abutment side inclined with respect to a moving direction at a portion pressed against the priming flow path, The priming flow path is compressed and crushed in a direction perpendicular to the movement direction of the shut-off valve. The chemical liquid injection controller according to claim 1 or 2.

9. The switch member is maintained in the pressed-in position by a locking piece provided on the switch member so as to protrude in the direction of movement and locking with the housing. The chemical liquid injection controller according to claim 1 or 2.

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