JP5631603B2 - Injection tool and chemical injection system equipped with the same - Google Patents

Description

  The present invention relates to an injection device configured to fill a predetermined amount of a chemical solution discharged from a chemical solution injection device and to derive the predetermined amount of the chemical solution according to a user's operation.

  Conventionally, as the infusion device, for example, Patent Document 1 discloses a liquid source supply means for supplying a liquid source under pressure, a bolus dosage device for providing a liquid with a controlled bolus dosage, An assembly is disclosed that includes means for adjusting the steady flow rate of the liquid. The bolus dose device has a dose reservoir that can be filled with the liquid from the liquid source supply means, and the dose reservoir can discharge its contents by being compressed. Yes.

Japanese translation of PCT publication No. 03-505538

  However, the bolus dose device of Patent Document 1 has a problem that a large force is required from the user in order to inject the drug solution filled in the dose reservoir into the patient's body. Specifically, in order to inject a drug solution filled in the dose reservoir into a patient, it is necessary to push the drug solution through a member having a large flow resistance such as a filter or a catheter. The force to compress the reservoir is very large.

  This invention is made | formed in view of the said subject, and aims at providing the injection | pouring tool which can reduce the force requested | required of the user for chemical | medical solution injection | pouring, and a chemical | medical solution injection | pouring system provided with the same. Yes.

In order to solve the above-described problems, the present invention is connected to a discharge unit capable of discharging a pressurized chemical solution, and is filled with the chemical solution from the discharge unit, and in accordance with a user's operation. An injection device configured to derive a fixed amount of chemical solution, configured to be able to store the chemical solution discharged from the discharge unit via an adjustment unit for adjusting the flow rate of the chemical solution, and to store the chemical solution A storage chamber that can be expanded according to the contraction, and can store the chemical liquid stored in response to the contraction; an urging means that can be elastically deformed while accumulating the urging force associated with the expansion of the storage chamber; Switchable between a lead-out path for guiding the liquid medicine to the patient side, a closed position for preventing the liquid medicine from being led out by the lead-out path, and an open position allowing the liquid medicine to be led out by the lead-out path A valve and said place in said containment chamber An operation unit capable of switching the switching valve from the closed position to the open position by receiving a user's operation in a state in which an amount of the chemical solution is accommodated, and the switching valve is opened using the operation unit. By switching to, the accommodating chamber is reduced by the urging force stored in the urging means to lead out the medicinal solution accommodated in the accommodating chamber, and the injection device has the accommodating chamber inside and a predetermined amount. along the telescopic shaft further comprises a retractable telescopic container, wherein the biasing means, by condensation Mukoto along said telescopic shaft with an extension of the telescopic container along the telescopic shaft, the plants in the housing chamber The biasing force is smaller than the force by which the telescopic container expands until a fixed amount of chemical solution is filled , and all of the chemical solution in the storage chamber when the switching valve is switched from the closed position to the open position. Lead It provides an injection tool, characterized in that an elastic member having an elastic coefficient that causes a biasing force as possible.

  According to the present invention, since the storage chamber can be reduced by the biasing force stored in the biasing means and the chemical liquid stored in the storage chamber can be led out, the force required for the user to inject the chemical liquid Can be reduced. In other words, according to the present invention, when the user operates the operating portion to switch the switching valve to the open position, the chemical solution in the storage chamber is discharged using the biasing force of the biasing means without applying any more force. Since it can be derived, the force required for the user to derive the chemical solution can be suppressed to the force for switching the switching valve to the open position. Therefore, according to this invention, the force requested | required of a user for chemical | medical solution injection | pouring can be reduced.

  In the present invention, an adjustment unit that adjusts (squeezes) the flow rate of the chemical solution from the discharge unit is provided on the chemical solution introduction side with respect to the storage unit, and this adjustment unit is compared to the outlet side (catheter or filter) of the storage unit. Since it has a large flow resistance, in a state where the switching valve is switched to the open position, the chemical solution in the storage portion flows preferentially to the outlet side where the flow resistance is small.

Further , according to the present invention , the elastic member can be contracted by introducing the chemical solution and extending the expansion / contraction container, and the urging force of the elastic member can be stored. Therefore, according to this structure, the chemical | medical solution in the said elastic container can be derived | led-out by shrinking an elastic container with the urging | biasing force of an elastic member.

Furthermore, according to the present invention , the expansion / contraction container can be reliably extended to a length in which the predetermined amount of the chemical solution is filled in the storage chamber, and the expansion / contraction container is applied by the urging force of the elastic member stored according to the extension operation. The chemical solution inside can be derived.

  Specifically, the elastic member can be composed of a coil spring.

  Preferably, the injection device further includes an introduction passage for guiding the chemical solution discharged from the discharge portion to the storage chamber, and the adjustment portion is provided as at least a part of the introduction passage. .

  According to this configuration, by providing a plurality of types of flow rates defined by the adjustment unit, it is possible to provide a plurality of types of injection devices having different times (lockout times) required for filling a predetermined amount of chemical liquid into the accommodation chamber can do.

Further, the present invention is intended to be connected to pressurized liquid medicine ejection portion capable of ejecting, to fill a drug solution from the discharge unit derives a predetermined amount of liquid medicine according to the user's operation The injection device configured as described above, and configured to be able to store the chemical solution discharged from the discharge unit via the adjustment unit for adjusting the flow rate of the chemical solution, while expanding according to the storage of the chemical solution, A storage chamber capable of deriving a medical solution stored in response to the reduction, an urging means capable of elastic deformation while accumulating an urging force accompanying expansion of the storage chamber, and a medical solution derived from the storage chamber on the patient side A switching passage that is switchable between a lead-out passage for leading to the lead, a closed position for preventing the lead-out of the chemical solution through the lead-out passage, and an open position that allows the lead-out of the chemical solution through the lead-out passage; Contains the predetermined amount of the chemical solution. And an operation unit capable of switching the switching valve from the closed position to the open position by receiving a user's operation, and using the operation unit to switch the switching valve to the open position, The storage chamber is contracted by the biasing force stored in the biasing means to draw out the chemical solution stored in the storage chamber, and the injection device has the storage chamber inside and can be expanded and contracted along a predetermined expansion / contraction axis An elastic container, and the biasing means contracts along the telescopic axis according to the expansion of the elastic container along the telescopic axis, and the container chamber is filled with the predetermined amount of the chemical solution. An elastic member having an elastic coefficient that generates an urging force smaller than a force by which the expandable container extends, and the switching valve is engaged with the opening / closing portion capable of opening / closing the lead-out passage, and the operation portion By doing And an operated portion that can be operated by the operating portion for displacing the opening / closing portion from a closed position to an open position, and the operating portion in a state where the predetermined amount of the chemical solution is accommodated in the accommodating chamber. When the operated portion is engaged and the amount of the chemical stored in the storage chamber is smaller than the predetermined amount by a predetermined amount or more, the storage chamber is contracted by the shortage amount. Thus, the injection tool is provided in which the engagement between the operation portion and the operated portion is restricted.

  According to this configuration, even if the operation unit is operated before the storage chamber is filled with a predetermined amount of the chemical solution, the opening / closing portion is maintained in the closed position, so that the chemical solution less than the predetermined amount is prevented from being led out. be able to. Therefore, according to the above configuration, it is possible to reliably administer a predetermined amount (predetermined amount) of the medicinal solution to the patient in order to obtain a target effect, and thus realize effective medicinal solution administration. In addition, it is possible to suppress a problem that extra time is required to satisfy the predetermined amount again by introducing a chemical solution that is less than the predetermined amount.

  In the injection device, it is preferable that the switching valve is switched from the open position to the closed position in accordance with the reduction of the storage chamber that reaches the end of the lead-out of the chemical solution through the lead-out passage.

  According to this configuration, the switching valve can be automatically switched from the closed position to the open position when the discharge of the chemical solution through the outlet passage is completed, so that the user only has to perform the operation of moving the switching valve from the closed position to the open position. A predetermined amount of the drug solution can be reliably administered to the patient, and after this administration, filling of the drug solution into the storage chamber is automatically started.

  Moreover, this invention provides the chemical | medical solution injection system characterized by including the discharge part which can discharge the pressurized chemical | medical solution, and the said injection tool connected to the said discharge part.

  ADVANTAGE OF THE INVENTION According to this invention, the force requested | required of a user for chemical | medical solution injection | pouring can be reduced.

It is the schematic which shows the whole structure of the chemical | medical solution injection | pouring system which concerns on preferable embodiment of this invention. It is a disassembled perspective view of the injection tool of FIG. It is sectional drawing which shows operation | movement of the injection tool of FIG. 1, and shows the state at the time of completion of discharge (at the time of first time filling). It is sectional drawing which shows operation | movement of the injection device of FIG. 1, and shows the state in the chemical | medical solution filling period with respect to a bellows container. It is sectional drawing which shows operation | movement of the injection tool of FIG. 1, and shows the state at the time of completion of chemical | medical solution filling. It is sectional drawing which shows operation | movement of the injection tool of FIG. 1, and shows the state at the time of operation of an operation member. It is sectional drawing which shows operation | movement of the injection device of FIG. 1, and has shown the state which has guide | induced the chemical | medical solution in a bellows container to the patient side. It is a list which shows the state of FIGS. It is the schematic which shows the whole structure of the chemical injection system which concerns on another embodiment of this invention. FIG. 10 is an enlarged cross-sectional view of the injection device in FIG. 9, showing a state in which the chemical solution is not filled. FIG. 10 is an enlarged cross-sectional view of the injection tool in FIG. 9 and shows a state in which a chemical solution is being injected.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram showing an overall configuration of a chemical liquid injection system according to a preferred embodiment of the present invention. FIG. 2 is an exploded perspective view of the injection device of FIG. Hereinafter, description will be made using the vertical direction of FIG.

  Referring to FIGS. 1 and 2, a chemical liquid injection system 1 includes a chemical liquid pump (discharge unit) 2 that can discharge pressurized chemical liquid, and a chemical liquid that is connected to the chemical liquid pump 2 and discharged from the chemical liquid pump 2. A flow controller 3 for adjusting the flow rate of the liquid, an injection device 4 configured to fill a chemical solution from the flow rate controller 3 and derive a predetermined amount of the chemical solution in accordance with a user operation, and And a catheter 5 for guiding the drug solution derived from the injection tool 4 to the patient. In the present embodiment, the chemical pump 2 and the flow rate controller 3 are connected by an introduction tube L1, and the flow rate controller 3 and the injection tool 4 are connected by an introduction tube L2, and the injection tool 4 and the catheter 5 are connected to each other. Are connected by a lead-out tube L3.

  The chemical liquid pump 2 has an accommodating portion that accommodates the chemical solution, and is configured to discharge the chemical solution in the accommodating portion while being pressurized to a predetermined pressure. Specifically, as the chemical pump 2, for example, one using an atmospheric pressure as a driving source as disclosed in International Publication No. 95/28977, an elastic container as disclosed in Japanese Patent Application Laid-Open No. 2004-147862 It is possible to adopt a driving force that uses a restoring force of the above, or a driving force that uses an urging force of an elastic member such as a spring.

  The injection tool 4 includes an introduction tube (introduction passage) L2 connected to the chemical liquid pump 2, a bellows container 6 capable of storing the chemical liquid guided by the introduction tube L2, and a chemical liquid derived from the bellows container 6 as a catheter. A lead-out tube (lead-out passage) L3 for leading to the side 5, a connection member 7 attached to the bellows container 6 and connected to the introduction tube L2 and the lead-out tube L3, and a switching valve 8 provided in the connection member 7 A coil spring (biasing means) 9 that is elastically deformed according to the expansion and contraction of the bellows container 6, a cylindrical container 10 that houses the bellows container 6, the connecting member 7, the switching valve 8, and the coil spring 9, and a lid 11 And an operation member (operation unit) 12 provided at one end of the cylindrical container 10.

  The bellows container 6 is configured to be expandable and contractible along a vertical expansion / contraction axis. The lower side of the expansion / contraction direction is closed and the upper side is open. Specifically, the bellows container 6 includes a cylindrical bellows body 6a that can be expanded and contracted along the telescopic axis, a bottom portion 6b that closes the lower side of the bellows body 6a, and a protruding portion 6c that is provided on the bottom portion 6b. It has. The protrusion 6c has a smaller diameter than the bottom 6b and protrudes downward.

  The connecting member 7 closes the opening of the bellows container 6 to form a storage chamber S1 inside the bellows container 6, and is connected to the introduction tube L2 and the lead-out tube L3 so as to be able to communicate with the storage chamber S1. The switching valve 8 to be described later is held. Specifically, the connection member 7 includes a pair of disk portions 7a and 7c having substantially the same diameter size, and a connecting portion 7b that concentrically connects these disk portions 7a and 7c. The bottom surface of the disc portion 7a is bonded in a state in which the end surface on the opening side of the bellows body 6a of the bellows container 6 is abutted. Moreover, the disc part 7a has the through-hole 7d penetrated up and down in the position inside the bellows main body 6a. The introduction tube L2 is connected to the disc portion 7a so as to communicate with the through hole 7d. The connecting portion 7b connects the disc portions 7a and 7c to each other at a substantially central position of the disc portions 7a and 7c. The connecting portion 7b is formed with an insertion hole 7f at a position corresponding to the center of each of the disc portions 7a and 7c, and the storage chamber S1 is opened to the upper side of the disc portion 7c through the insertion hole 7f. . A switching valve 8 described later is inserted into the insertion hole 7f. Further, a through hole 7e is formed in the connecting portion 7b so as to penetrate the connecting portion 7b in a direction orthogonal to the axial direction of the connecting portion 7b. The lead-out tube L3 is connected to the connecting portion 7b so as to communicate with the through hole 7e.

  The switching valve 8 is connected to the connection position so that the switching valve 8 can be switched between an open position that allows derivation of the chemical solution through the derivation tube L3 and a closed position that prevents derivation of the chemical solution through the derivation tube L3. It is provided in the insertion hole 7f of the portion 7b. Specifically, the switching valve 8 includes a rod-like rod-shaped main body 8a having a thickness that can be inserted into the insertion hole 7f, and a pair of upper and lower O-rings 8b and 8c provided outside the rod-shaped main body 8a. ing. The O-rings 8b and 8c are sized to prevent the flow of the chemical solution between the rod-shaped main body 8a and the connecting portion 7b by being sandwiched between the rod-shaped main body 8a and the inner surface of the insertion hole 7f. At the same time, as shown in FIG. 1, the through holes 7 e are spaced apart from each other at intervals that allow the through holes 7 e to be sandwiched in the insertion holes 7 f. Then, as shown in FIG. 6, the rod-shaped main body 8a moves downward from the closed position shown in FIG. 1 with the through hole 7e sandwiched between the O-rings 8b and 8c, and the O-ring 8c moves to the lower side of the connecting portion 7b. By switching to the arranged open position, the chemical solution in the storage chamber S1 can be guided to the outlet tube L3 side through the through hole 7e. On the other hand, the rod-shaped main body 8a has a length capable of coming into contact with the lower surface of the operation member 12 as shown in FIG. 5 when a predetermined amount of chemical solution is filled in the bellows container 6 in the closed position. In other words, the rod-shaped main body 8a is configured such that when the medicinal solution filled in the bellows container 6 is equal to or less than a preset amount at the closed position, the bellows container 6 is contracted by this shortage, so It has a length away from the lower surface. Further, as shown in FIG. 3, the rod-shaped main body 8a returns to the closed position as shown in FIG. 3 according to the contraction operation of the bellows container 6 until the derivation of the predetermined amount of the chemical solution is completed in the open position. It has a possible length. In the present embodiment, each of the O-rings 8 b and 8 c and a part of the rod-like main body 8 a that supports them correspond to the opening / closing portion, and the upper portion of the rod-like main body 8 a corresponds to the operated portion that engages with the operation member 12.

  The coil spring 9 can be expanded and contracted between the cylindrical container 10 and the lid body 11 according to the expansion and contraction operation of the bellows container 6. Specifically, the cylindrical container 10 includes a cylindrical main body portion 10a and a protruding portion 10b protruding inward at the upper portion of the main body portion 10a, and is fixed to the lower opening end of the protruding portion 10b and the main body portion 10a. The bellows container 6, the connecting member 7, the switching valve 8, and the coil spring 9 are accommodated between the lid body 11 thus made. That is, the lid 11 supports the bottom portion 6b of the bellows body 6a so that it can expand and contract, and the disc portion 7c of the connecting member 7 fixed on the bellows container 6 and the protruding portion 10b of the cylindrical container 10. A coil spring 9 is supported between the two. The spring coefficient of the coil spring 9 is determined by the force (the discharge pressure of the chemical pump 2) that expands the bellows container 6 before the bellows container 6 is filled with a predetermined amount (3 ml in this embodiment) of the chemical liquid. It is set so as to generate an elastic force smaller than the resulting force. Accordingly, the coil spring 9 contracts while accumulating elastic force according to the expansion operation of the bellows body 6a, while the operation member 12 described later is operated, whereby the elasticity of the coil spring 9 is used as a force for contracting the bellows body 6a. Power can be used.

  The operation member 12 is for pressing the rod-shaped main body 8a of the switching valve 8 and switching the switching valve 8 from the closed position to the open position by receiving an operation from the user. Specifically, the operation member 12 includes a bottomed container-like operation part main body 12a that opens downward, a cylindrical part 12b that protrudes downward from the bottom of the operation part main body 12a, and an outer side from the lower end of the cylindrical part 12b. A protruding flange portion 12c and an operating rod 12d protruding downward from the bottom of the operating portion main body 12a so as to be coaxial with the cylindrical portion 12b are provided. The operation part main body 12a is inserted into the main body part 10a of the cylindrical container 10 from an upper opening, and can slide up and down along the inner surface of the main body part 10a with the protrusion 10b as a lower limit. . The cylinder part 12b penetrates the protrusion part 10b up and down through a hole formed in the protrusion part 10b. The flange portion 12 c functions as a stopper to prevent the operating member 12 from coming off by contacting the lower surface of the protruding portion of the cylindrical container 10. Further, the upper end portion of the coil spring 9 abuts on the lower surface of the flange portion 12c, and the operating member 12 is always urged upward by the urging force of the coil spring 9. The operation rod 12d is arranged coaxially with the rod-shaped main body 8a of the switching valve 8, and is switched by depressing the operation member 12 in a state where the upper end surface of the rod-shaped main body 8a is in contact with the lower end surface of the operation rod 12d. The valve 8 is pushed down from the closed position to the open position.

  Hereinafter, operation | movement of the said chemical | medical solution injection system 1 is demonstrated with reference to FIGS. FIG. 3 is a cross-sectional view showing the operation of the injection tool 4 of FIG. 1 and shows a state when the discharge is completed (at the time of initial filling). FIG. 4 shows a state in which the bellows container 6 is filled with the chemical solution. FIG. 5 shows a state at the completion of filling with the chemical solution. FIG. 6 shows a state when the operation member 12 is operated. FIG. 7 shows a state in which the drug solution in the bellows container 6 is led out to the patient side. FIG. 8 is a list showing the states of FIGS.

  3 and 8, the bellows body 6 a of the bellows container 6 is urged by the biasing force of the coil spring 9 when all the chemicals in the bellows container 6 are filled or when the use of the injection device 4 is started. It is in the most contracted state. In the present embodiment, the coil spring is configured such that the coil spring 9 is also contracted when the bellows container 6 is most contracted so that the biasing force of the coil spring 9 is generated even when the bellows container 6 is contracted most. A length of 9 is set. In the state of FIG. 3, the lower end portion of the rod-shaped main body 8 a of the switching valve 8 is brought into contact with the bottom portion 6 b (protruding portion 6 c) of the bellows container 6 and pushed up, whereby the switching valve 8 is brought into the closed position. Yes. Therefore, in this state, the chemical solution from the introduction tube L2 is introduced through the through hole 7d, so that a predetermined amount of time (hereinafter referred to as a lockout time) from the state of FIG. In the form, 3 ml) of the chemical solution is filled in the bellows container 6.

  4 and 8, during the lockout time, the connection member 7 is pushed up as the bellows container 6 expands with the filling of the chemical solution. As a result, the connection member 7 and the cylindrical container 10 are The coil spring 9 provided between the protruding portion 10b is compressed. In other words, the bellows container 6 extends while accumulating the elastic force of the coil spring 9. In addition, when the bellows container 6 is extended, the switching valve 8 is also lifted together with the connecting member 7 while maintaining the closed position.

  5 and 8, when the lockout time comes, that is, when a predetermined amount of chemical solution is filled, the upper end surface of the rod-shaped main body 8a of the switching valve 8 comes into contact with the operation rod 12d of the operation member 12. . Although not shown, when the lockout time arrives, the ascending of the connecting member 7 is restricted. Specifically, a positioning portion that contacts the upper surface of the connection member 7 is provided on the inner surface of the cylindrical container 10, or the thickness and shape of the bellows container 6 are designed so as to prevent further expansion, By setting the spring coefficient of the coil spring 9 so that the force by which the bellows container 6 extends and the elastic force by the coil spring 9 are suspended, the rise of the connecting member 7 can be regulated.

  With reference to FIGS. 6 and 8, when the operation member 12 is pushed down after the lockout time has come, the bar-shaped main body 8a is pushed down, so that the O-ring 8c is disposed below the disk portion 7a. As a result, the inside of the bellows container 6 (accommodating chamber S1) is depressurized by allowing the flow of the chemical liquid from the bellows container 6 to the outlet tube L3 as indicated by the arrow Y1, so that the elasticity stored in the coil spring 9 is reduced. The bellows container 6 is reduced by force, and the chemical solution in the bellows container 6 is led out to the lead-out tube L3 through the insertion hole 7f and the through hole 7e. Here, the reason why the chemical solution in the bellows container 6 flows preferentially toward the outlet tube L3 is that the flow resistance of the flow rate controller 3 is larger than the flow resistance of the catheter 5.

  7 and 8, during the derivation of the chemical solution, the connecting member 7 also descends following the contraction operation of the bellows container 6, so that the switching valve 8 descends while maintaining the open position. . Then, as shown in FIG. 3 described above, when all the chemical solution in the bellows container 6 is led out, the switching valve 8 is switched to the closed position by pushing the bar-shaped main body 8a against the bottom 6b of the bellows container 6 and pushing it up. .

  As described above, according to the above-described embodiment, since the storage chamber S1 can be contracted by the elastic force stored in the coil spring 9 and the chemical liquid stored in the storage chamber S1 can be led out. Therefore, the force required for the user can be reduced. That is, according to the present invention, when the user operates the operation member 12 to switch the switching valve 8 to the open position, the accommodation chamber S1 is utilized by utilizing the elastic force of the coil spring 9 without applying any more force. Therefore, the force required for the user to derive the chemical solution can be suppressed to the force for switching the switching valve 8 to the open position. Therefore, according to the said embodiment, the force requested | required of a user for chemical | medical solution injection | pouring can be reduced.

  According to the configuration including the bellows container 6 that expands and contracts in the vertical direction and the coil spring 9 that contracts according to the extension of the bellows container 6, the bellows container 6 is contracted by the elastic force of the coil spring 9. Thus, the chemical solution in the bellows container 6 can be derived.

  In the present embodiment, the coil spring 9 is illustrated as an elastic member that contracts in accordance with the expansion of the bellows container 6, but is not limited to this. For example, elastically deformable rubber, air springs, and the like are used. A simple fluid spring can also be used as the elastic member.

  According to the configuration in which the coil spring 9 has a spring coefficient that generates an elastic force smaller than the force by which the bellows container 6 expands until the container chamber S1 is filled with a predetermined amount of the chemical solution as in the above embodiment. For example, the bellows container 6 can be reliably extended to a length in which the predetermined amount of the chemical solution is filled in the storage chamber S1, and the elastic force of the coil spring 9 stored in accordance with the extension operation allows The chemical solution can be derived.

  As in the above-described embodiment, the operation member 12 and the rod-shaped main body 8a of the switching valve 8 are in contact with each other in a state where a predetermined amount of the chemical is stored in the storage chamber S1, and the chemical stored in the storage chamber S1 is When the amount is less than the fixed amount, the operation member 12 and the rod-shaped main body 8a are not in contact with each other by the contraction of the bellows container 6 by the shortage amount. Even if the operating member 12 is operated until the switch is made, the switching valve 8 is maintained in the closed position, so that it is possible to prevent derivation of the chemical solution less than the predetermined amount. Therefore, according to the embodiment, since it is possible to reliably administer a predetermined amount (predetermined amount) of a medicinal solution to a patient in order to obtain a target effect, effective medicinal solution administration is realized. In addition, it is possible to suppress a problem that extra time is required to satisfy the predetermined amount again by introducing a chemical solution that is less than the predetermined amount.

  In this embodiment, when the filling amount of the chemical solution in the bellows container 6 is 90% or less of the originally required amount (for example, 3 ml), the switching valve 8 is opened even if the operation member 12 is pushed down. Therefore, the length of the rod-shaped main body 8a of the switching valve 8 is set.

  According to the configuration in which the switching valve 8 is switched from the open position to the closed position in accordance with the contraction of the bellows container 6 that reaches the end of the derivation of the chemical solution through the derivation tube L3 as in the above-described embodiment, the switching is performed with the completion of the derivation of the chemical solution. Since the valve 8 can be automatically switched, a predetermined amount of drug solution can be surely administered to the patient only by the user's operation to move the switching valve 8 from the closed position to the open position. After that, the filling of the chemical solution into the bellows container 6 is automatically started.

  In the above-described embodiment, the flow rate controller 3 is attached via the introduction tube L2, but the flow rate controller 3 can be directly provided to the injection tool 4 (for example, the connecting member 7).

  Hereinafter, another embodiment of the present invention will be described with reference to FIGS.

  FIG. 9 is a schematic diagram showing an overall configuration of a chemical liquid injection system 20 according to another embodiment of the present invention. FIG. 10 is an enlarged cross-sectional view of the injection device shown in FIG. 9 and shows a state where the chemical solution is not filled. FIG. 11 is an enlarged cross-sectional view of the injection tool of FIG. 9 and shows a state in which a chemical solution is being injected. In addition, it demonstrates below using the up-down direction of each figure.

  9 to 11, a chemical liquid injection system 20 includes a chemical liquid pump 2, an injection tool 21 connected to the chemical liquid pump 2 via an introduction tube L4, and an injection tool 21 and a discharge tube L5. And a catheter 5 connected to each other.

  The injection tool 21 includes an introduction tube L4, a first connection member 22 connected to the introduction tube L4, a flow rate control member 23 provided on the first connection member 22, and a chemical solution from the flow rate control member 23. Provided at the upper end of the elastic cylinder 24, an elastic cylinder (side wall of the elastic container) 24 for forming the storage chamber S2 to be accommodated, a lead-out tube L5 for guiding the drug solution led out from the storage chamber S2 to the patient side A second connection member 25 connected to the lead-out tube L5, a switching valve 26 provided on the second connection member 25, a holding member 27 that holds the second connection member 25 slidably, and a first connection member A storage container 28 for storing the first connection member 22, the flow rate control member 23, the elastic cylinder 24, the second connection member 25, the switching valve 26 and the holding member 27 while fixing the 22 and the holding member 27, and the storage container 28 An operating member (operating part) 30 provided at the upper end, and a coil spring 29 for biasing the operating member 30 relative to container 28.

  The first connection member 22 is a member for defining the lower end of the storage chamber S2, and is made of synthetic resin. Specifically, the first connecting member 22 includes a main body portion 22a having a cylindrical outer surface, a cylindrical body 22b protruding downward from the main body portion 22a, and the main body portion 22a concentrically with the cylindrical body 22b. And a through hole 22c penetrating vertically. An introduction tube L4 is connected to the lower end of the cylindrical body 22b. Further, a flow rate control member 23 to be described later is press-fitted into the cylindrical body 22b, and the chemical liquid that has passed between the flow rate control member 23 and the inner side surface of the cylindrical body 22b passes through the through hole 22c to accommodate the storage chamber S2. Led in.

  The flow rate control member 23 is a substantially cylindrical synthetic resin member. The flow control member 23 has an outer dimension that is equal to or slightly larger than the inner diameter of the cylindrical body 22b, and is press-fitted into the cylindrical body 22b. And the spiral groove is formed in the outer peripheral surface of the flow control member 23, and a chemical | medical solution is passed through the microchannel divided between the inner surface of this groove and the inner surface of the cylinder 22b. By passing, the pressure loss is caused and the flow rate of the chemical solution is reduced.

  The elastic cylinder 24 is a cylindrical member made of an elastic synthetic resin. The lower end portion of the elastic cylinder 24 is fixed to the main body portion 22a by means such as adhesion in a state where the lower end portion is covered on the columnar outer surface of the main body portion 22a of the first connection member 22. On the other hand, the upper end portion of the elastic cylinder 24 is fixed to the second connection member 25 by means of adhesion or the like in a state of being covered on the outside of the second connection member 25 described later. Thereby, in the elastic cylinder 24, a storage chamber S <b> 2 that can store a chemical solution is formed between the first connection member 22 and the second connection member 25. Therefore, the first connecting member 22 and the second connecting member 25 are separated from each other while the elastic cylinder 24 is extended as shown in FIG. 9, and the accommodation chamber S2 expands. On the other hand, as shown in FIG. And the second connecting member 25 approach each other, the accommodation chamber S2 is reduced. Note that the through hole 22c of the first connection member 22 opens into the storage chamber S2.

  The second connecting member 25 includes a main body 25a having a cylindrical outer surface, a holding cylinder 25b protruding upward from the main body 25a, and a connection extending from the holding cylinder 25b in a direction perpendicular to the holding cylinder 25b. And a cylinder 25c. The elastic cylinder 24 is placed on and fixed to the cylindrical outer surface of the main body 25a. In addition, the main body portion 25a is formed with a hole penetrating up and down coaxially with the holding cylinder 25b, and the storage chamber S2 is opened to the upper side of the second connection member 25 through the hole and the holding cylinder 25b. . The connection cylinder 25c is a cylinder that communicates with the inside of the holding cylinder 25b, and a lead-out tube L5 is connected to the tip of the connection cylinder 25c.

  The switching valve 26 is a second connecting member so that it can be switched between an open position that allows derivation of the chemical solution via the derivation tube L5 and a closed position that prevents derivation of the chemical solution via the derivation tube L5. 25 holding cylinders 25b are provided. Specifically, the switching valve 26 includes a rod-like rod-shaped main body 26a having a thickness that can be inserted into the holding cylinder 25b, and a pair of upper and lower O-rings 26b, 26c provided outside the rod-shaped main body 26a. ing. The O-rings 26b and 26c are sized to prevent the flow of the chemical solution between the rod-shaped main body 26a and the holding cylinder 25b by being sandwiched between the rod-shaped main body 26a and the inner surface of the holding cylinder 25b. In addition, as shown in FIG. 9, the holes in the connection cylinder 25 c are spaced apart from each other in the holding cylinder 25 b so that the holes in the connection cylinder 25 c can be sandwiched vertically. Then, as shown in FIG. 11, the rod-shaped main body 26a moves downward from the closed position shown in FIG. 9 in which the holes in the connection cylinder 25c are sandwiched between the O-rings 26b and 26c, and the O-ring 26c becomes the second connection member. By switching to the open position arranged on the outer side (lower side) of 25, the chemical solution in the storage chamber S2 can be guided to the outlet tube L5 side through the connection tube 25c. On the other hand, the rod-shaped main body 26a has a length capable of coming into contact with the lower surface of the operation member 30 as shown in FIG. 9 when a predetermined amount of chemical solution is filled in the storage chamber S2 in the closed position. In other words, the rod-like main body 26a has the second connecting member 25 close to the first connecting member 22 by the shortage when the chemical liquid filled in the storage chamber S2 is equal to or less than a preset amount at the closed position. By doing so, it has a length away from the lower surface of the operation member 30. Further, the rod-shaped main body 26a is connected to the first connection as shown in FIG. 10 in accordance with the reduction operation of the storage chamber S2 (the proximity operation of the two connection members 22 and 25) until the derivation of the predetermined amount of the chemical solution is completed at the open position. It has a length that can contact the member 22 and return to the closed position.

  The holding member 27 holds the second connecting member 25 inside so that the second connecting member 25 can move up and down. Specifically, the holding member 27 is a cylindrical member whose upper end is closed and which can accommodate the main body portion 25a of the second connection member 25. The upper end portion of the rod-shaped main body 26a extends vertically through the bottom portion thereof. And a slit 27a provided on the side wall in order to allow the connecting cylinder 25c (lead tube L5) of the second connecting member 25 to move up and down.

  The storage container 28 is used to fix the first connecting member 22 and the holding member 27 at a constant interval and to hold an operation member 30 described later in an operable manner. Specifically, the storage container 28 includes a substantially circular covering portion 28a that covers the outside of the first connection member 22, the flow rate control member 23, the elastic cylinder 24, the second connection member 25, the switching valve 26, and the holding member 27, A cylindrical portion 28b and a cylindrical portion 28c projecting upward and downward from the covering portion 28a, and a holding member 31 provided in the lower cylindrical portion 28b are provided. The holding member 27 is fixed to the inner side surface of the covering portion 28a by means such as adhesion. The holding member 31 is fixed to the inner side surface of the lower cylindrical portion 28 b, and the lower surface of the main body portion 22 a of the first connection member 22 is fixed to the upper surface of the holding member 31. The holding member 31 has a through hole 31a for passing the cylindrical body 22b of the first connection member 22 and a through hole 31b for passing the lead-out tube L5. On the other hand, the upper cylindrical portion 28c is provided with a protruding portion 28d protruding inward. The protruding portion 28d functions as an upward stopper for the operation member 30 described later.

  The operating member 30 is for pressing the rod-shaped main body 26a of the switching valve 26 and switching the switching valve 26 from the closed position to the open position by receiving an operation from the user. Specifically, the operation member 30 includes an operation portion 30a having an operation surface, a side wall 30b erected downward at a peripheral edge portion of the operation portion, an engagement hole 30c formed in the side wall 30b, and an operation portion. And an operation rod 30d protruding downward from 30a. The operation part 30a and the side wall 30b are slidably inserted into the upper cylindrical part 28c of the storage container 28. The engagement hole 30 c defines a range of vertical movement of the operation member 30 with respect to the storage container 28. Specifically, the protrusion 28d of the storage container 28 is inserted into the engagement hole 30c, and a lower limit position where the protrusion 28d abuts on the upper side surface of the engagement hole 30c, and the protrusion 28d. And the upper limit position where the lower side surface of the engagement hole 30c comes into contact with each other, the operation member 30 can be moved up and down. The operating rod 30d is arranged coaxially with the rod-shaped main body 26a of the switching valve 26, and the switching valve is operated by depressing the operating member 30 in a state where the upper end surface of the rod-shaped main body 26a is in contact with the lower end surface of the operating rod 30d. 26 is pushed down from the closed position to the open position.

  The coil spring 29 is provided between the lower surface of the operation portion 30a and the upper surface of the holding member 27, and constantly biases the operation member 30 upward.

  Hereinafter, the operation of the chemical injection system 1 will be described.

  Referring to FIG. 10, when all of the chemical solution in the storage chamber S <b> 2 is filled or when the use of the injection tool 21 is started, the second connecting member 25 is most affected by the elastic force (restoring force) of the elastic cylinder 24. The state is close to the first connection member 22 (the accommodation chamber S2 is empty). In this state, the switching valve 26 is closed by the lower end portion of the rod-shaped main body 26 a of the switching valve 26 being in contact with the upper surface of the first connecting member 22 and being pushed up with respect to the second connecting member 25. It is considered as a position. Therefore, in this state, the chemical solution is introduced from the introduction tube L4 through the through hole 22c, so that a predetermined amount of the chemical solution is filled into the storage chamber S2 from the state of FIG. 10 over the lockout time. When the chemical solution is introduced into the storage chamber S2, the first connecting member 22 and the second connecting member 25 are separated from each other, so that the elastic cylinder 24 is expanded and stored while restoring force of the elastic cylinder 24 is stored. The chamber S2 is filled with a chemical solution.

  Referring to FIG. 9, when the lockout time comes, the upper end surface of rod-shaped main body 26 a of switching valve 26 comes into contact with operation rod 30 d of operation member 30. In this state, when the operation member 30 is pushed down, the rod-shaped main body 26a is pushed down, so that the O-ring 26c is disposed on the outer side (lower side) of the first connection member 22. As a result, since the inside of the storage chamber S2 is depressurized by allowing the flow of the chemical solution from the storage chamber S2 to the outlet tube L5, the second connecting member 25 is pulled downward by the restoring force stored in the elastic cylinder 24. Accordingly, the storage chamber S2 is reduced, and the chemical solution in the storage chamber S2 is led out via the lead-out tube L5.

  Referring to FIG. 11, during the derivation of the chemical solution, the switching valve 26 also descends following the movement of the second connecting member 25, so that the switching valve 26 descends while maintaining the open position. Then, as shown in FIG. 10, when all the chemical liquid in the storage chamber S <b> 2 is led out, the switching valve 26 is switched to the closed position by pushing the bar-shaped main body 26 a against the upper surface of the first connection member 22.

  As described above, according to the embodiment, since the side wall of the elastic cylinder 24 itself can be used as the urging means, the container for storing the chemical solution and the elastic member that contracts according to the expansion of the container, The configuration can be simplified as compared with the case where each is provided individually.

L1, L2, L4 Introduction tube (introduction passage)
L3, L5 Lead tube (lead passage)
S1, S2 storage chamber 1, 20 chemical solution injection system 2 chemical solution pump (discharge unit)
3 Flow controller (adjustment unit)
4, 21 Injection tool 6 Bellows container (expandable container)
8, 26 Switching valve 8a, 26a Bar-shaped body (opening / closing part, operated part)
8b, 8c, 26b, 26c O-ring (opening / closing part)
9 Coil spring (elastic member)
12, 30 Operation member (operation unit)
22 First connection member (part of elastic container)
23 Flow control member (adjustment part)
24 Elastic cylinder (side wall of elastic container)
25 Second connecting member (part of elastic container)

Claims (6)

Injection that is connected to a discharge unit capable of discharging a pressurized chemical solution, and is configured to fill the chemical solution from the discharge unit and to derive a predetermined amount of the chemical solution according to a user's operation Tools,
The chemical liquid discharged from the discharge unit is configured to be accommodated via an adjustment unit for adjusting the flow rate of the chemical liquid, and expands in response to the storage of the chemical liquid, while the chemical liquid stored in response to the reduction is stored. A derivable containment chamber;
An urging means that is elastically deformable while accumulating an urging force with the expansion of the storage chamber;
A lead-out passage for guiding the liquid medicine led out from the storage chamber to the patient side;
A switching valve that is switchable between a closed position for preventing derivation of the chemical solution by the derivation passage and an open position that permits derivation of the chemical solution by the derivation passage;
An operation unit capable of switching the switching valve from the closed position to the open position by receiving a user's operation in a state where the predetermined amount of the chemical solution is stored in the storage chamber;
By switching the switching valve to the open position using the operation unit, the storage chamber is reduced by the biasing force stored in the biasing means, and the chemical liquid stored in the storage chamber is led out,
The injection tool further includes an expansion / contraction container that has the storage chamber inside and can expand and contract along a predetermined expansion / contraction axis,
Said biasing means, by condensation Mukoto along the telescopic shaft with an extension of the telescopic container along the telescopic shaft, the extendable container until the predetermined amount of liquid medicine is filled in the housing chamber There is a small biasing force than the force to stretch, and has a modulus of elasticity that causes a biasing force can be derived all drug solution of said housing chamber when said switching valve is switched from the closed position to the open position An injection device comprising an elastic member. Injection that is connected to a discharge unit capable of discharging a pressurized chemical solution, and is configured to fill the chemical solution from the discharge unit and to derive a predetermined amount of the chemical solution according to a user's operation Tools,
The chemical liquid discharged from the discharge unit is configured to be accommodated via an adjustment unit for adjusting the flow rate of the chemical liquid, and expands in response to the storage of the chemical liquid, while the chemical liquid stored in response to the reduction is stored. A derivable containment chamber;
An urging means that is elastically deformable while accumulating an urging force with the expansion of the storage chamber;
A lead-out passage for guiding the liquid medicine led out from the storage chamber to the patient side;
A switching valve that is switchable between a closed position for preventing derivation of the chemical solution by the derivation passage and an open position that permits derivation of the chemical solution by the derivation passage;
An operation unit capable of switching the switching valve from the closed position to the open position by receiving a user's operation in a state where the predetermined amount of the chemical solution is stored in the storage chamber;
By switching the switching valve to the open position using the operation unit, the storage chamber is reduced by the biasing force stored in the biasing means, and the chemical liquid stored in the storage chamber is led out,
The injection tool further includes an expansion / contraction container that has the storage chamber inside and can expand and contract along a predetermined expansion / contraction axis,
The biasing means is contracted along the telescopic axis in accordance with the expansion of the telescopic container along the telescopic axis, and the elastic container is moved until the predetermined amount of the chemical solution is filled in the storage chamber. An elastic member having an elastic coefficient that generates an urging force smaller than a stretching force;
The switching valve engages with the opening / closing portion capable of opening and closing the lead-out passage and the operation portion, so that the operation portion can be operated by the operation portion for displacing the opening / closing portion from the closed position to the open position. With an operation unit,
In a state where the predetermined amount of the chemical solution is stored in the storage chamber, the operation portion and the operated portion are engaged, and the amount of the chemical solution stored in the storage chamber is set in advance from the predetermined amount. When the amount is smaller than the above, the injection chamber is characterized in that the engagement between the operation portion and the operated portion is restricted by the shrinkage of the storage chamber by the shortage amount. The injection tool according to claim 1, wherein the elastic member is a coil spring. An introduction passage for guiding the chemical liquid discharged from the discharge portion to the storage chamber;
The injection device according to any one of claims 1 to 3, wherein the adjustment portion is provided as at least a part of the introduction passage.   5. The switching valve according to claim 1, wherein the switching valve is switched from the open position to the closed position in accordance with the reduction of the storage chamber that reaches the end of the derivation of the chemical solution through the derivation passage. The infusion device described in 1. A discharge part capable of discharging pressurized chemical liquid;
A chemical solution injection system comprising: the injection device according to any one of claims 1 to 5 connected to the discharge unit.

Images