JP7185848B2 - chemical injection controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a liquid medicine injection controller capable of performing rapid injection of liquid medicine by self-operation in a liquid medicine administration apparatus that continuously injects liquid medicine.

2. Description of the Related Art Conventionally, a drug solution administration device that continuously administers a drug solution has been known, and is used, for example, when administering an analgesic or an anesthetic into the body little by little. In addition, the drug solution administration device may include a drug solution injection controller that enables rapid administration of the drug solution by self-operation. The drug solution injection controller has a sub-reservoir that stores the drug solution. For example, when the patient performs a self-operation such as pushing a pressing operation member, the drug solution is stored in the sub-reservoir of the drug solution injection controller through a sub-line branched from the main line. The injected drug solution is rapidly administered into the patient's body.

By the way, the liquid medicine injection controller has a mechanism that opens an outflow channel connected to the sub-reservoir to allow the liquid medicine to flow out from the sub-reservoir when the patient performs the self-operation. For example, when the patient pushes the push operation member, the driving member integrally formed with the push operation member pushes the valve body for rapid administration, thereby moving the valve body away from the outflow channel.

However, when the main driving member is extended to the vicinity of the valve body so as to operate the valve body by the main driving member, the main driving member extending from the pressing operation member becomes long, and the length dimension of the pressing operation member becomes the forming portion of the main moving member. However, the symmetry of the shape is greatly impaired, and it is difficult to stabilize the dimensional accuracy. Although the dimensional accuracy can be improved by shortening the main moving member, the movement stroke of the main moving member becomes longer, and minute dimensional errors affect the movement of the main moving member. In addition, the liquid injection controller is required to be small because it is worn on the body at all times, and miniaturization of each member constituting the liquid injection controller requires high operating accuracy for each member. It will happen.

The problem to be solved by the present invention is to provide a liquid injection controller with a novel structure that can improve the movement stability of the main moving member.

Hereinafter, preferred embodiments for understanding the present invention will be described. can be recognized and employed as independently as possible, and can also be employed in combination with any of the components described in other aspects as appropriate. Accordingly, the present invention can be implemented in various alternatives without being limited to the embodiments described below.

In a first aspect, a pressing operation member for performing rapid drug solution administration is reciprocally assembled in a housing that accommodates a sub-reservoir, and the outflow channel is provided on the outflow channel of the drug solution from the sub-reservoir. A valve body for rapid administration is provided for switching between a communicating state and a blocked state, and the pressing member and the main driving member separate from the valve member are in a preparatory position before the pressing operation. The valve is arranged with a gap from the valve so that the pressed operating member contacts the main moving member and the driven member moves the outflow flow path from the blocked state to the open state. It moves the body.

According to the drug solution injection controller constructed according to this mode, the main driving member for moving the valve body for rapid administration to the position where the outflow channel is in communication when the pressing operation member is operated is the pressing operation member and the valve body. Since both are separated from each other, there is no need to make the main driving member and the pressing operation member both long components. Therefore, it is possible to improve the dimensional stability of each member such as the main moving member and the pressing member. In addition, since the pressing operation member and the main driving member are separated from each other, the moving stroke of the main driving member can be set short. As a result, it is possible to improve the movement stability of the main driving member and the operating accuracy of the member.

In addition, since neither the main driving member nor the pressing operation member is required to be an elongated part, for example, the main moving member and the pressing operation member are less likely to undergo dimensional changes due to bending, and the pressing operation member rapidly administers via the main moving member. It is possible to stably realize the opening and closing operation of the valve body by pushing the valve body.

Further, the main driving member is arranged with a gap with respect to the pressing operation member which is in the preparatory position before the pressing operation. Therefore, an impact is generated when the pressed operating member comes into contact with the main moving member, and this impact is transmitted to the fingers of the patient operating the pressing operating member. Therefore, the patient who operates the pressing operation member can grasp the amount of operation of the pressing operation member by the response.

A second aspect is the liquid injection controller according to the first aspect, wherein the main moving member comprises the pressing operation member in a preparatory position before pressing operation and the valve body in a blocking position of the outflow passage. are arranged with a gap between them.

According to the drug solution injection controller constructed according to this aspect, even when the main driving member pushed by the pressing operation member abuts against the valve body for rapid administration, the impact caused by the abutment affects the patient who operates the pressing operation member. transmitted to fingers. Therefore, the patient who operates the pushing operation member can feel, for example, that the main driving member has been pushed to the position where the valve body is moved.

A third aspect is the liquid injection controller according to the first or second aspect, wherein the initial position before being moved is relative to the main moving member moved by the contact of the pressing operation member that has been pressed. A return spring is provided to exert an urging force in the direction of returning.

According to the liquid injection controller constructed according to this aspect, the main driving member moved by the contact of the pressing member is urged by the return spring in the direction of returning to the initial position before being moved. As a result, when the main driving member is released from being pushed by the pressing member, the main driving member quickly separates from the valve body for rapid administration due to the urging force of the return spring, and the force exerted from the main driving member to the valve body is more reliable. is released at As a result, switching of the outflow channel from the communication state to the cutoff state by the rapid administration valve body can be realized more reliably.

A fourth aspect is the liquid injection controller according to the third aspect, wherein the return spring is integrally formed with the main driving member.

According to the liquid injection controller constructed according to this aspect, the number of parts can be reduced by integrally forming the return spring with the main driving member.

A fifth aspect is the liquid injection controller according to any one of the first to fourth aspects, wherein the main moving member moves in the same direction as the reciprocating direction of the pressing member.

According to the liquid injection controller constructed according to this aspect, the size of the liquid injection controller can be reduced in the direction orthogonal to the reciprocating direction of the pressing member.

A sixth aspect is the liquid injection controller according to any one of the first to fifth aspects, wherein a and a post-contact movement stroke amount after the pressing member contacts the main driving member is set to 1/5 or less.

According to the drug solution injection controller constructed according to this aspect, the response transmitted to the patient due to the contact between the pressing operation member and the main driving member occurs at the end of the movement stroke of the pressing operation member. It is also possible to grasp from the response that the process will be completed soon. Moreover, the time from when the patient feels a response to when the pressing operation is completed is sufficiently short, and it is possible to inform the patient at an appropriate timing that the pressing movement of the pressing operation member will soon be completed.

ADVANTAGE OF THE INVENTION According to this invention, while it becomes easy to arrange|position a pushing operation member and a main-drive member in a predetermined position, the stable operation|movement of the valve body for rapid administration can be implement|achieved.

1 is a perspective view showing a liquid injection controller as a first embodiment of the present invention; FIG. 2 is a perspective view showing the liquid injection controller shown in FIG. 1 with the upper half of the housing removed; FIG. FIG. 4 is a cross-sectional view of the liquid injection controller shown in FIG. 1 and corresponds to the III-III cross section of FIG. 4; IV-IV cross-sectional view of FIG. VV sectional view of FIG. VI-VI sectional view of FIG. VII-VII cross-sectional view of FIG. 2 is a perspective view of a main driving member that constitutes the liquid injection controller shown in FIG. 1; FIG. FIG. 9 is a perspective view showing the driving member of FIG. 8 from another angle; FIG. 13 is a cross-sectional view showing a preparation state in which priming is completed in the liquid injection controller shown in FIG. 3, and is a view corresponding to the XX cross section of FIG. 12; XI-XI sectional view of FIG. XII-XII sectional view of FIG. XIII-XIII sectional view of FIG. FIG. 16 is a cross-sectional view showing a state in which the push button is pressed in the liquid injection controller shown in FIG. 3, and corresponds to the XIV-XIV cross section of FIG. 15; XV-XV sectional view of FIG. XVI-XVI sectional view of FIG. FIG. 4 is a cross-sectional view showing a state in which rapid chemical injection is completed in the chemical injection controller shown in FIG. 3 ;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a liquid injection controller 10 as a first embodiment of the present invention. The liquid medicine injection controller 10 is for a patient, who is a user, to perform rapid liquid medicine injection by self-operation, and as shown in FIGS. structure. In order to make the internal structure of the liquid injection controller 10 easier to see, the illustration of the upper half of the housing 12 is omitted in FIG. In the following description of the liquid injection controller 10, as a general rule, the up-down direction is the left-right direction in FIG. 4, the front-rear direction is the up-down direction in FIG. Say the directions, respectively.

More specifically, the housing 12 is made of hard synthetic resin or the like. The housing 12 has a hollow shape whose longitudinal direction is the front-rear direction as a whole, more specifically, a substantially cylindrical shape with a bottom. The housing 12 has a flat hollow cross-sectional shape over a wide range except for the rear end portion, and has a hollow, substantially oval cross-section in this embodiment. As a result, the longitudinal direction of the housing 12 in cross section is the vertical direction, and the minor axis direction is the left-right direction. The flat cross-sectional shape referred to here is not limited to an elliptical cross-section, and may be, for example, a flat polygonal cross-section. Preferably, the housing 12 is sized to be grasped in one hand by a patient and has a gripping surface 16 on its outer circumference for gripping by the patient.

A sub-reservoir 14 is accommodated in the housing 12 . As shown in FIGS. 3 to 6, the sub-reservoir 14 is constructed by covering the opening of a cup-shaped diaphragm portion 18 with a base member 20 .

The diaphragm portion 18 is made of rubber, resin elastomer, or the like, and has flexibility. The diaphragm portion 18 is substantially cup-shaped in a stationary state where no external force acts. A flange-like clamping portion 22 protruding to the outer periphery is integrally formed in the opening portion of the diaphragm portion 18 over the entire circumference. The bottom portion 24 of the diaphragm portion 18 is thicker than the peripheral wall portion of the diaphragm portion 18 and has a large deformation rigidity.

A bottom portion 24 of the diaphragm portion 18 has a curved surface in the shape of a spherical crown on the front surface of the inner peripheral portion. Further, the curvature of the front surface of the crown-shaped projecting portion of the bottom portion 24 of the diaphragm portion 18 is smaller than the curvature of the concave surface forming the rear surface of the base member 20 . As a result, the amount of liquid medicine remaining in the contracted sub-reservoir 14 is reduced, and the bottom portion 24 of the diaphragm portion 18 is less likely to stick to the rear surface of the base member 20 .

A bottom portion 24 of the diaphragm portion 18 is integrally formed with a positioning projection 26 projecting rearward from the center. The positioning protrusion 26 is rod-shaped, and has a tapered portion 28 at the tip end of which the diameter decreases toward the tip. The large-diameter end portion of the taper portion 28 has a larger diameter than the base end portion of the positioning projection 26 outside the taper portion 28 to form a step.

The base member 20 is made of hard synthetic resin or the like and has a substantially disk shape. The base member 20 is formed such that a cylindrical liquid medicine inflow portion 30 and a liquid medicine outflow portion 32 are formed in a penetrating state. A plurality of engaging protrusions 34 protrude rearward (upward in FIG. 7) from the base member 20 . The base member 20 is connected to the guide member 36 by these engaging projections 34 .

The guide member 36 is made of hard synthetic resin or the like and has a substantially cylindrical shape. The guide member 36 is provided with a flange-shaped engaging portion 38 protruding toward the outer periphery at the front end portion. The base member 20 and the guide member 36 are connected in the axial direction by hooking the engaging projections 34 of the base member 20 on the engaging portions 38 . The engagement portion 38 of the guide member 36 is provided with locking hooks 40 as locking claws at two locations in the circumferential direction. The locking hook 40 integrally includes a plate-like extension portion extending rearward from the engaging portion 38 and a claw portion projecting outward from the tip of the extension portion. The rear surface of the locking hook 40 has an inclined shape that inclines forward toward the outer circumference.

The diaphragm portion 18 is inserted into the inner peripheral side of the guide member 36 . The holding portion 22 of the diaphragm portion 18 is sandwiched and supported between the base member 20 and the guide member 36 in the axial direction (front-rear direction), whereby the diaphragm portion 18 is assembled to the base member 20 and the guide member 36. It is In such an assembled state, the opening of the diaphragm portion 18 is liquid-tightly closed by the base member 20 to form the sub-reservoir 14 . Furthermore, the internal space of the sub-reservoir 14 is communicated with the internal lumens of the liquid medicine inflow portion 30 and the liquid medicine outflow portion 32 penetrating through the base member 20 .

The sub-reservoir 14 is positioned with respect to the housing 12 by attaching the base member 20 and the guide member 36 to the housing 12 . A bottom portion 24 of the diaphragm portion 18 is movable in the front-rear direction with respect to the housing 12, and is allowed to expand and contract in the front-rear direction. The expansion deformation of the diaphragm portion 18 toward the outer periphery is restricted by the guide member 36 .

A plunger 42 is superimposed on the bottom portion 24 of the diaphragm portion 18 . As shown in FIGS. 3 to 6, the plunger 42 has a structure in which a plunger main body 44 and an outer peripheral guide portion 46 are integrally connected at the rear end portion.

The plunger main body 44 has a substantially bottomed cylindrical shape that opens toward the rear. A fitting hole 48 is formed in the front wall portion of the plunger main body 44 so as to extend through the central portion thereof in the front-rear direction. By fitting the positioning protrusion 26 of the diaphragm portion 18 into the fitting hole 48, a positioning mechanism for positioning the plunger 42 and the bottom portion 24 of the diaphragm portion 18 relative to each other is configured.

The outer peripheral guide portion 46 has a cylindrical shape and is provided so as to surround the outer periphery of the plunger main body 44 . The outer peripheral guide portion 46 is formed with unlocking portions 50 protruding to the outer periphery at two front end portions on the periphery. The unlocking portion 50 is inclined toward the outer periphery toward the front, and the inner peripheral surface is an inclined surface. The unlocking portion 50 is inserted into a locking hole 58 of a push button 52, which will be described later. The unlocking portions 50 , 50 are provided at positions corresponding to the locking hooks 40 , 40 of the guide member 36 in the circumferential direction, and protrude from the inner peripheral surfaces of the locking hooks 40 , 40 to the outer periphery.

Also, the plunger 42 is inserted in a push button 52 as a pressing operation member. The push button 52 has a substantially bottomed cylindrical shape that opens forward. The opening of the push button 52 is inserted into the rear end portion of the housing 12 from the rear in the axial direction, and the push button 52 is assembled in the housing 12 so as to reciprocate in the longitudinal direction (front-rear direction). The bottom wall side of the push button 52 protrudes axially rearward from the rear end opening of the housing 12 . The rear surface of the push button 52 exposed from the housing 12 serves as a pressing operation surface 54 as a fingertip pressing surface, and the user (patient) presses the pressing operation surface 54 with a thumb while gripping the gripping surface 16 of the housing 12. is possible.

A small-diameter cylindrical spring support portion 56 is integrally formed on the inner peripheral portion of the bottom wall portion of the push button 52 . The spring support portion 56 has an outer peripheral shape corresponding to the inner peripheral shape of the coil spring 60 described later, and protrudes forward from the bottom wall portion of the push button 52 .

Engagement holes 58 are formed in the peripheral wall portion of the push button 52 at two locations in the circumferential direction. The locking hole 58 penetrates the peripheral wall portion of the push button 52 in the radial direction and linearly extends in the front-rear direction.

A coil spring 60 is arranged between the plunger 42 and the push button 52 in the axial direction. A front end portion of the coil spring 60 is inserted into the inner circumference of the plunger body 44 . The coil spring 60 is positioned with respect to the push button 52 in a direction perpendicular to the axis by externally inserting the rear end portion of the coil spring 60 into the spring support portion 56 of the push button 52 . As a result, the coil spring 60 is stably held in a predetermined arrangement extending between the plunger 42 and the push button 52 in the front-rear direction. The plunger 42 and the push button 52 can be relatively displaced in the front-rear direction with elastic deformation of the coil spring 60 . Also, the spring force of the coil spring 60 is applied between the plunger 42 and the push button 52 . That is, when the coil spring 60 is compressed, a repulsive force based on the elasticity of the coil spring 60 is exerted between the plunger 42 and the push button 52 in a direction to separate the plunger 42 and the push button 52 from each other.

As shown in FIG. 3, an inflow channel 62 and an outflow channel 64 are connected to the base member 20 of the sub-reservoir 14 . The inflow channel 62 can be switched from a communicating state to a blocked state by a closing valve 66 . As shown in FIGS. 3 and 5, the inflow channel 62 is connected to a restrictive channel 68 that bypasses the portion blocked by the shutoff valve 66 . The restriction channel 68 has a channel cross-sectional area smaller than that of the inflow channel 62, and limits the flow rate (flow velocity) of the chemical solution.

The outflow channel 64 can be switched between a communicating state and a blocked state by a quick dosing valve 70 . The quick dosing valve 70 includes a quick dosing valve body 72 and a coil spring 74 as a valve biasing means.

The valve body 72 integrally includes a valve body portion 76 and a pair of driven pieces 78 , 78 . As shown in FIG. 6, the valve main body 76 has a plate-shaped clamping projection 80 protruding downward at the front-rear central portion thereof and extending substantially perpendicularly to the front-rear direction. The clamping projection 80 is gradually thinned toward the tip. A recess 81 is opened in the upper surface of the valve main body 76 , and the coil spring 74 is inserted into the recess 81 . A coil spring 74 is compressed between the valve body portion 76 and the upper wall portion of the housing 12 . As a result, a downward biasing force is applied to the valve body portion 76 by the coil spring 74 .

As shown in FIGS. 3 and 7, the pair of driven pieces 78, 78 of the valve body 72 are plate-shaped and extend vertically. The lower surface of each driven piece 78 forms a driven-side inclined surface 82 in which the front portion extends perpendicularly to the vertical direction and the rear portion inclines upward toward the rear. The pair of driven pieces 78, 78 are arranged with a predetermined distance from each other in the left-right direction. A clamp projection 80 is provided between the pair of driven pieces 78 , 78 . The clamp projection 80 is integrally formed with a pair of driven pieces 78, 78, and both left and right ends are connected to the pair of driven pieces 78, 78. As shown in FIG.

A portion of the outflow channel 64 extends in the front-rear direction between the pair of driven pieces 78 , 78 , and the valve body 76 having the clamp projection 80 is positioned above the outflow channel 64 . A flow rate control unit 84 is provided in front of the shutoff valve 66 and the quick dosing valve 70 in the inflow channel 62 and the outflow channel 64 to communicate the inflow channel 62 and the outflow channel 64 with each other. . The flow control section 84 has a channel cross-sectional area smaller than that of the inflow channel 62 and the outflow channel 64, and limits the flow rate (flow velocity) of the chemical solution.

The valve body 72 of the rapid dosing valve 70 has a lower portion including a pair of driven pieces 78 , 78 inserted into a cylindrical guide tube portion 86 extending upward from the lower wall portion of the housing 12 . As a result, the valve body 72 is allowed to move in the vertical direction with respect to the housing 12, and its movement in the front-rear direction and the left-right direction is restricted. As shown in FIG. 7, the guide tube portion 86 has a through hole 88 opening at the lower end of the peripheral wall. The through hole 88 is provided so as to penetrate the rear portion of the peripheral wall of the guide tube portion 86 in the front-rear direction. In this embodiment, a pair of through holes 88, 88 are formed corresponding to a pair of contact pieces 92, 92 of the main driving member 90, which will be described later.

The through hole 88 of the guide tube portion 86 allows the leading end portion of the driving member 90 to be inserted therethrough. The driving member 90 is a hard member made of synthetic resin such as polypropylene or polyamide, and is, for example, an injection molded product of synthetic resin. As shown in FIGS. 8 and 9, the driving member 90 has a pair of contact pieces 92, 92 facing each other in the left-right direction and extending parallel to each other. The contact piece 92 has a driving-side inclined surface 94 in which the upper portion of the front surface is inclined rearward upward. The pair of contact pieces 92 , 92 are connected to each other by a body portion 96 at their proximal ends. The body portion 96 is provided with an input portion 98 projecting rearward. The input portion 98 has a plate shape that curves and spreads along the peripheral wall of the housing 12 . In the present embodiment, the input portion 98 is inclined in the left-right direction because the driving member 90 is arranged at a position deviated to the right in FIG. 3 with respect to the center in the left-right direction of the housing 12 .

As shown in FIGS. 8 and 9, a return spring 100 is integrally formed with the main body portion 96 of the driving member 90 . The return spring 100 has a plate shape and is elastically deformable in the front-rear direction. The return spring 100 extends forward from the front end of the body portion 96 between the pair of contact pieces 92 , 92 . A base end portion 102 of the return spring 100 connected to the body portion 96 has a flat plate shape that is inclined upward toward the front. The return spring 100 has an intermediate portion 104 extending from the base end portion 102 and has an arcuate curved plate shape. The return spring 100 has a flat plate shape in which a tip portion 106 extending from an intermediate portion 104 is downwardly inclined forward. The front end of the tip portion 106 of the return spring 100 is a free end located between the pair of contact pieces 92,92. The return spring 100 can be elastically deformed by deforming the intermediate portion 104 so that the angle of inclination between the proximal end portion 102 and the distal end portion 106 is reduced.

The driving member 90 is separate from the push button 52 and the valve body 72, and is arranged in front of the push button 52 as shown in FIGS. Since the main moving member 90 is thicker than the peripheral wall of the push button 52, the main moving member 90 has high strength. The pair of contact pieces 92 , 92 of the driving member 90 are positioned so as to be insertable and retractable in the front-rear direction with respect to the through holes 88 , 88 of the guide tube portion 86 . The input portion 98 of the main driving member 90 is arranged at a position at least partially overlapping the front end portion 108 of the push button 52 in the front-rear direction. The return spring 100 of the driving member 90 has the front end of the distal end portion 106 positioned rearward with respect to between the pair of through holes 88 , 88 in the guide tube portion 86 .

In this manner, the main driving member 90 is a separate component that is independent of both the push button 52 and the housing 12 that includes the guide tube portion 86 . Since the driving member 90 is separate from the push button 52, lengthening of parts is avoided compared to the case where the driving member is provided integrally with the push button. Therefore, dimensional errors and distortions of the main moving member 90 and the push button 52 are suppressed, and switching between the opening and closing of the rapid dosing valve 70 is realized with high accuracy. Easy to assemble.

As shown in FIGS. 2 and 3, in the liquid injection controller 10 having such a structure, an upstream external line 110 is connected to the inflow channel 62, and a downstream external line 112 is connected to the outflow channel 64. are connected to form a drug-solution administration device. A main line 114 is configured by the upstream external line 110 , the inflow channel 62 , the flow control section 84 , the outflow channel 64 , and the downstream external line 112 . The main line 114 is a flow path that connects a main reservoir (not shown) and an administration port (not shown) connected to an indwelling needle or the like on the patient side without going through the sub-reservoir 14 . A sub-line 116 is formed by the downstream side of the connecting portion of the flow control portion 84 in the inflow channel 62 and the upstream side of the connecting portion of the flow control portion 84 in the outflow channel 64 . The sub-line 116 is a channel branched from the main line 114 and connected to the sub-reservoir 14 .

In the chemical injection controller 10 before use, for example, as shown in FIGS. 3 to 6, the sub-reservoir 14 not filled with the chemical is contracted in the front-rear direction. A plunger 42 positioned at the bottom 24 of the sub-reservoir 14 is positioned forward. The push button 52 is positioned forward by locking the unlocking portions 50 , 50 of the plunger 42 to the front edges of the locking holes 58 , 58 . In the liquid injection controller 10 before use, the plunger 42 and the push button 52 are arranged at the farthest relative position in the front-rear direction, and the compression deformation amount of the coil spring 60 arranged between the plunger 42 and the push button 52 is is made smaller. The push button 52 is located behind the locking hooks 40, 40 of the guide member 36, and the locking hooks 40, 40 are not inserted into the locking holes 58, 58. As shown in FIG.

The drug-solution administration device including the drug-solution injection controller 10 performs priming, in which the main line 114 and the sub-line 116 are filled with a drug solution (priming solution) before starting administration. That is, in the initial state of the liquid medicine injection controller 10 (states shown in FIGS. 3 to 7) in which both the shutoff valve 66 and the rapid injection valve 70 are open, the liquid medicine is fed from the main reservoir (not shown). As a result, the chemical liquid flow path including the main line 114 and the sub-line 116, and the sub-reservoir 14 are filled with the chemical liquid. Air in the liquid medicine flow path and the sub-reservoir 14 is pushed downstream by the liquid medicine and discharged to the outside through an administration port (not shown) or the like.

Upon completion of priming, the sub-reservoir 14 is filled with the chemical and expanded as shown in FIG. As a result, the plunger 42 is pushed by the diaphragm portion 18 and moves backward. The push button 52 moves rearward with the plunger 42 and protrudes rearward from the rear end of the housing 12 .

In the ready state before priming is completed and the push button 52 is pushed in, the front end portion 108 of the push button 52, which has moved rearward and is in the ready position, and the input portion 98 of the main driving member 90 are mutually moved in the longitudinal direction. is seperated. Thereby, a gap 118 is provided between the front end portion 108 of the push button 52 and the input portion 98 of the main driving member 90 . In short, the main driving member 90 is arranged with a gap 118 in the front-rear direction with respect to the push button 52 in the ready position.

After priming is completed, the switch member 120 integrally formed with the shutoff valve 66 is pushed downward, thereby moving the shutoff valve 66 integrally with the switch member 120 downward. As a result, as shown in FIGS. 10 and 11, the shut-off valve 66 is pressed against the inflow passage 62 in the direction perpendicular to the flow passage, and the inflow passage 62 is crushed and shut off at the portion where the shut-off valve 66 is pressed. be done. The upstream side and downstream side of the inflow channel 62 with respect to the portion blocked by the shutoff valve 66 are communicated by a restricted channel 68 , and the restricted channel 68 restricts the flow rate of the chemical solution per unit time.

By moving the switch member 120 downward, as shown in FIG. movement is allowed. As a result, the valve body 72 is moved downward by the biasing force of the coil spring 74 , and the clamp projection 80 of the valve body 72 is pressed against the outflow channel 64 in the direction orthogonal to the flow channel of the outflow channel 64 . As a result, as shown in FIGS. 10 to 12, the outflow channel 64 is partially crushed by the valve body 72, and the outflow channel 64 is partially blocked by the rapid administration valve 70, so that the sub-reservoir Outflow of the chemical solution from 14 is prevented.

When the valve body 72 of the quick dosing valve 70 moves downward, the pair of driven pieces 78, 78 are separated from the pair of contact pieces 92, 92 of the main driving member 90 as shown in FIG. there is Thereby, a gap 122 is formed between the pair of driven pieces 78 and 78 and the pair of contact pieces 92 and 92 . In short, the driving member 90 is arranged with a gap 122 in the front-rear direction with respect to the pair of driven pieces 78 , 78 of the valve body 72 at the blocking position of the outflow passage 64 . Therefore, the downward movement of the valve body 72 is not hindered by the main driving member 90 . Therefore, blocking of the outflow channel 64 by the quick dosing valve 70 is realized without being hindered by the main driving member 90 .

However, even if the pair of driven pieces 78, 78 contact the pair of contact pieces 92, 92 of the main driving member 90 when the valve body 72 moves downward, the downward movement of the valve body 72 is not impeded by the driving member 90; That is, the gap 118 is formed between the front end portion 108 of the push button 52 and the input portion 98 of the main moving member 90, thereby allowing the main moving member 90 to move rearward. Therefore, even if the pair of driven pieces 78, 78 come into contact with the pair of contact pieces 92, 92 of the main driving member 90, the main driving member 90 escapes rearward, and the downward movement of the valve body 72 is prevented by the driving member 90. 90 without hindrance.

In the state where the stop valve 66 and the rapid administration valve 70 are closed, the liquid medicine that has entered the inflow channel 62 from the upstream external line 110 is passed through the flow control unit 84 to the downstream external line connected to the outflow channel 64. 112. As a result, the drug solution is continuously administered little by little into the patient's body through an indwelling needle (not shown) or the like connected to the main line 114 and the downstream external line 112 . The amount per unit time of the drug solution continuously administered into the patient's body is adjusted by the flow rate of the flow control section 84 .

The patient performs a self-operation of pushing the push button 52 of the drug solution injection controller 10 when performing rapid administration to temporarily increase the dose of the drug solution. When push button 52 is depressed by the patient, coil spring 60 is compressed between push button 52 and plunger 42, as shown in FIG. As a result, the plunger 42 is subjected to forward biasing force based on the elasticity of the compressed coil spring 60 .

As the push button 52 is pushed forward, the locking hooks 40, 40 of the guide member 36 are inserted into the locking holes 58, 58 of the push button 52, and are pressed against the inner surfaces of the front ends of the locking holes 58, 58. axially locked. As a result, the push button 52 is held in the pushed position against the biasing force of the coil spring 60 , and the biasing force of the coil spring 60 is efficiently applied to the plunger 42 .

As the push button 52 is pushed forward, the front end portion 108 of the push button 52 is pressed against the input portion 98 of the main driving member 90 from behind as shown in FIG. As a result, the main driving member 90 advances integrally with the push button 52, and as shown in FIG. It is pressed against the driven pieces 78,78. The pair of contact pieces 92 , 92 and the pair of driven pieces 78 , 78 contact each other on the driving side inclined surface 94 and the driven side inclined surface 82 . Therefore, the force applied forward to the push button 52 is converted into an upward force when transmitted from the main driving member 90 to the pair of driven pieces 78, 78, and the pair of driven pieces 78, 78 are converted into upward force. It is applied to the valve body 72 provided. As a result, the valve body 72 moves upward against the urging force of the coil spring 74 , and the shutoff of the outflow passage 64 by the rapid dosing valve 70 is released.

A gap 118 is formed between the front end portion 108 of the push button 52 and the input portion 98 of the main moving member 90 in the ready state before the push button 52 is pushed. Therefore, when the push button 52 is pushed, the front end portion 108 of the push button 52 and the input portion 98 of the main driving member 90 approach each other from the separated state and contact each other, and an impact is generated at the time of contact. Since the impact at the time of this contact is transmitted to the finger of the patient who operates the push button 52, the patient can also grasp the pressing operation amount of the push button 52 by the response. Furthermore, the patient can perceive that the patient's pressing operation is actuating the drug solution discharge mechanism by the response transmitted to the fingers.

The amount of movement (movement stroke) in which the push button 52 and the driving member 90 move integrally while the front end portion 108 and the input portion 98 are brought into contact with each other is, for example, 1/1/2 of the entire stroke of the forward movement due to the depression of the push button 52 . 5 or less, more preferably 1/10 or less. As a result, the impact when the push button 52 and the main driving member 90 come into contact with each other with the gap 118 therebetween is generated after the push button 52 has moved to the final stage of the full movement stroke. Therefore, the time from when the patient feels a response to when the pressing operation is completed is sufficiently shortened, and the patient can grasp that the pressing operation of the push button 52 is about to be completed by the response at an appropriate timing. can do.

A gap 122 is provided between the main driving member 90 at the preparation position and the pair of driven pieces 78 , 78 of the valve body 72 in the preparation state before the pressing operation. As a result, when the pair of contact pieces 92, 92 of the driving member 90 and the pair of driven pieces 78, 78 of the valve body 72 come into contact with each other, the impact caused by the contact is transmitted to the finger of the patient operating the push button 52. be. Therefore, the patient who presses the push button 52 can grasp by feeling that the main driving member 90 has pushed up the valve body 72 and moved to the position where the rapid administration valve 70 releases the blockage of the outflow passage 64 . can.

As the driving member 90 moves forward with respect to the housing 12, the return spring 100 of the driving member 90 is pressed against the guide tube portion 86 of the housing 12 between the pair of through holes 88, 88 and elastically deformed. As a result, based on the elasticity of the return spring 100, a rearward biasing force is exerted on the driving member 90 at a position advanced from the initial position to return it to the initial position.

When the push button 52 is pushed and the coil spring 60 is compressed, the plunger 42 is pressed against the diaphragm portion 18 of the sub-reservoir 14 by the biasing force of the coil spring 60 . As a result, the bottom portion 24 of the diaphragm portion 18 is pushed forward by the plunger 42 . As a result, the internal pressure of the sub-reservoir 14 pressed by the plunger 42 increases, and the liquid medicine stored in the sub-reservoir 14 flows out to the downstream external line 112 through the communicating outflow passage 64 . . Then, the amount of drug solution administered into the patient's body through the downstream external line 112 is temporarily increased, and rapid drug solution administration is performed. In addition, the inflow channel 62 is blocked by a shutoff valve 66, and the inner diameter of the restricted channel 68 is made extremely small. Therefore, when the internal pressure of the sub-reservoir 14 increases, the chemical liquid in the sub-reservoir 14 is sent out to the outflow channel 64 without flowing back to the inflow channel 62 .

In this way, the self-actuated depressed push button 52 compresses the coil spring 60 against the plunger 42 rather than pushing directly against the plunger 42 to transmit force. The repulsive force of the compressed coil spring 60 is exerted on the plunger 42 so that the plunger 42 presses the sub-reservoir 14 . As a result, it is possible to prevent excessive pressure from acting on the sub-reservoir 14, improve the durability of the sub-reservoir 14, and efficiently push out the liquid medicine in the sub-reservoir 14. - 特許庁

Once the push button 52 is pushed, the liquid injection controller 10 is held in the position where the push button 52 is pushed until the injection of the liquid medicine is completed. Therefore, by performing a pressing operation once for a short period of time, substantially the entire amount of the liquid medicine stored in the sub-reservoir 14 is administered over a predetermined period of time. Therefore, a patient using the liquid medicine injection controller 10 can inject a sufficient amount of liquid medicine with one push without continuously pressing the push button 52 .

In this embodiment, the plunger 42 and the bottom portion 24 of the diaphragm portion 18 are mutually positioned by the positioning projections 26 . Therefore, when the diaphragm portion 18 of the sub-reservoir 14 is compressed by the movement of the plunger 42, displacement of the compressed position is prevented, and the diaphragm portion 18 is stably compressed.

When rapid administration of the liquid medicine is completed, as shown in FIG. 17, the unlocking portions 50, 50 of the plunger 42 moved forward come into contact with the locking hooks 40 of the guide member 36, and the locking hooks 40 are released. to the left and right inwards. As a result, the engagement of the engagement hooks 40, 40 with the inner surfaces of the engagement holes 58, 58 of the push button 52 is released, allowing the push button 52 to move rearward with respect to the housing 12. As shown in FIG.

A force based on the elasticity of the return spring 100 acts rearward on the push button 52 and the driving member 90 . Therefore, when the movement restriction of the push button 52 by the locking hooks 40, 40 is released, the push button 52 and the main moving member 90 are quickly moved backward to the position (see FIG. 3) where the return spring 100 restores its initial shape. Move to When the push button 52 is disengaged from the locking hooks 40 , 40 , the push button 52 is moved rearward by the elasticity of the return spring 100 . , 58 and positioned forward of the push button 52 .

The driving member 90 linearly moves in the front-rear direction, which is the same direction as the reciprocating direction of the push button 52 . As a result, the liquid injection controller 10 can be made smaller in the direction orthogonal to the front-rear direction, which is the reciprocating direction of the push button 52 . It should be noted that the moving direction of the main driving member 90 being the same as the reciprocating direction of the push button 52 is not limited to the case where it is strictly the same direction, but also the relative inclination to the extent that it can be regarded as the substantially same direction. Also includes direction.

Further, the return spring 100 of this embodiment is formed integrally with the main moving member 90 . Therefore, the number of parts can be reduced compared to a structure in which a return spring is provided separately from the driving member 90, and the structure can be simplified.

The return spring 100 is imparted with a predetermined elasticity due to the curved plate shape of the intermediate portion 104 . Therefore, while the driving member 90 is made of a hard material, the return spring 100 integrally formed with the driving member 90 is provided with elasticity. In this way, the main moving member 90 integrally formed with the return spring 100 is made rigid, and the shape stability of the main moving member 90 is ensured, so that the accuracy of the switching operation of the rapid dosing valve 70 is ensured. .

When the push button 52 moves backward, the unlocking portions 50, 50 of the plunger 42 are locked to the inner surfaces of the locking holes 58, 58 of the push button 52, so that the plunger 42 moves backward together with the push button 52. Move to

When the main driving member 90 moves rearward due to the elasticity of the return spring 100, the pair of contact pieces 92, 92 of the main driving member 90 and the pair of driven pieces 78, 78 of the valve body 72 constituting the quick dosing valve 70 contact each other. connection is released. As a result, the clamp projection 80 of the valve body 72 is pressed against the outflow channel 64 by the biasing force of the coil spring 74 , and the outflow channel 64 is switched to the closed state by the quick dosing valve 70 . Since the elastic force of the return spring 100 acts on the main driving member 90 in this manner, the outflow passage 64 is quickly and stably shut off by the rapid dosing valve 70 when the rapid dosing of the drug solution is completed. be.

Furthermore, by moving the push button 52 rearward, part of the chemical liquid sent from the main reservoir (not shown) to the upstream external line 110 is filled into the sub-reservoir 14 through the inflow channel 62 and the restriction channel 68. be. The time required for refilling the sub-reservoir 14 with a predetermined amount of the chemical solution after the rapid administration of the chemical solution is adjusted by the restricted flow path 68, and by preventing excessive supply of the chemical solution to the sub-reservoir 14, Overdose of the drug solution is prevented.

As the amount of the chemical solution in the sub-reservoir 14 increases, the plunger 42 is pushed by the diaphragm portion 18 of the sub-reservoir 14 and moves backward. By filling the sub-reservoir 14 with substantially the same amount of liquid medicine as before the rapid liquid injection, the plunger 42 and the push button 52 are moved to the preparation positions shown in FIG. 10 before executing the rapid liquid medicine injection. This makes it possible to re-execute the rapid administration of the drug solution by self-operation.

As shown in FIG. 1, a projection 124 provided on the plunger 42 is inserted into a slit 126 penetrating the peripheral wall of the housing 12 as a mark. The position of the plunger 42 relative to the housing 12 in the axial direction can be grasped from the outside by the position of the protrusion 124 within the slit 126 . For example, a state in which the upper protrusion 124 has moved to the vicinity of the rear end of the slit 126 indicates a state in which the sub-reservoir 14 is filled with the chemical solution. The plunger 42 of the present embodiment has a rotationally symmetrical shape of 180° in the circumferential direction, and when the plunger 42 is assembled, the restrictions on the orientation are eased, thereby facilitating manufacturing.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific descriptions. For example, the gap 122 provided between the pair of contact pieces 92, 92 of the driving member 90 and the pair of driven pieces 78, 78 of the valve body 72 is not essential. At the preparation position before the push button 52 is pressed, the pair of contact pieces 92, 92 of the main driving member 90 and the pair of driven pieces 78, 78 of the valve body 72 may be in contact with each other.

The driving member 90 does not necessarily have to have only one pair of contact pieces 92 , and may have a structure having one or three or more contact pieces 92 . Also, the number of driven pieces 78 of the valve body 72 may be one or three or more. The number of contact pieces 92 and the number of driven pieces 78 may be different from each other. The type, configuration, shape, etc. of the valve body are not limited in the present invention.

The return spring may be separate from the main moving member. Specifically, for example, by disposing a return spring made of an elastic body such as a coil spring or rubber between the main driving member and the guide cylinder as a separate member, the return spring is separate from the main driving member. can also be set. In this way, if the main driving member and the return spring are separated, the materials and shapes of the main driving member and the return spring can be set with a large degree of freedom in accordance with the different characteristics required of the main driving member and the return spring. be able to.

10: chemical injection controller, 12: housing, 14: sub-reservoir, 52: push button (press operation member), 64: outflow channel, 72: valve body, 90: main moving member, 100: return spring

Claims (6)

A pressing operation member for performing rapid drug solution administration is reciprocally assembled in a housing that accommodates the sub-reservoir,
A valve body for rapid administration is provided on the outflow channel of the liquid medicine from the sub-reservoir to switch the outflow channel between a communicating state and a blocked state,
A main driving member separate from the pressing member and the valve body is arranged with a gap from the pressing member in a preparatory position before the pressing operation,
A liquid injection controller for moving the valve body so that the pressed operating member abuts against the main moving member and the main moving member moves the outflow flow path from the closed state to the open state. 2. The liquid medicine according to claim 1, wherein the main driving member is arranged with a gap between the pressing operation member at a preparatory position before the pressing operation and the valve body at the blocking position of the outflow passage. injection controller. 3. The method according to claim 1 or 2, further comprising a return spring that exerts a biasing force in a direction of returning the main moving member to the initial position before being moved to the main moving member that has been moved by the contact of the pressed pressing member. dosing controller. 4. The liquid injection controller according to claim 3, wherein the return spring is integrally formed with the main moving member. The liquid injection controller according to any one of claims 1 to 4, wherein the main moving member moves in the same direction as the reciprocating direction of the pressing operation member. The post-contact movement stroke amount after the pressing operation member comes into contact with the main moving member is 1/5 of the total moving stroke amount of the pressing operation member by the pressing operation for executing rapid drug solution administration. A dosing controller according to any one of claims 1 to 5, wherein:

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