JP6875583B2 - Pumping unit - Google Patents

Description

(Cross-reference of related applications)
The present application claims priority under Japanese Patent Application No. 2015-1289772 and is incorporated herein by reference.

The present invention relates to a pump unit and a method for manufacturing a pump unit for administering a liquid drug filled in a drug container to a patient.

As a dosing mechanism for administering a liquid drug (drug solution) filled in a drug container to a patient, for example, there is an infusion volume adjusting device described in Patent Document 1. This device is equipped with a pump (micropump) that feeds liquid by expanding and contracting the pump chamber.

In the infusion system incorporating the device described in Patent Document 1, even if the tube connected to the discharge side of the pump is blocked, backflow does not occur due to the configuration of the pump, so that the pump continues to be driven. A large amount of chemical solution may stay in the section from the pump to the blockage.

However, even if the tube is clogged, no action is taken on the device side (Patent Document 1 describes a control means for detecting the occurrence of an abnormal situation, but does not describe the tube clog. ). For this reason, when a medical worker such as a nurse releases the obstruction, a large amount of the drug solution accumulated in the tube may be administered to the patient at once, which is not preferable.

Further, since this dosing mechanism may be used by being attached to the body of a patient, for example, compactification is required.

Japanese Patent Application Laid-Open No. 2011-177411

Therefore, the present invention provides a pump unit that can prevent an excessive amount of drug solution from being administered to a patient at once when the obstruction is released even when a pipe such as a tube is obstructed, and can contribute to a compact dosing mechanism. The challenge is to provide.

The present invention is used in a dosing mechanism for administering a liquid drug filled in a drug container to a patient, a pump that sucks the drug from the drug container and discharges the drug to the patient, and the drug from the drug container. A pump unit including a pump inlet-side flow path leading to a pump and a pump outlet-side flow path for guiding a drug from the pump to a patient, wherein the pump inlet-side flow path, the pump outlet-side flow path, and one of them are The block body further includes a block body having a built-in bypass flow path communicating with the pump inlet side flow path and the other communicating with the pump outlet side flow path, and a bypass on-off valve for opening and closing the bypass flow path. The pump unit is a pump unit in which the pump and the bypass on-off valve are integrally formed in the block body by arranging a plurality of units having holes forming a flow path for the drug in combination.

Further, in the pump unit of the present invention, it is preferable that each of the units is a plate-like body, and the block body is formed by laminating the plurality of units in the thickness direction.

According to the pump unit of the present invention, even if a pipe such as a tube in the dosing mechanism is obstructed, it is possible to prevent an excess drug solution from being administered to the patient at once when the obstruction is released, and the medication mechanism is compact. Can contribute to the conversion.

It is a schematic diagram which shows the administration route of one Embodiment in this invention. It is a front view which shows the main body and the pump unit in the state which removed the lid part of this embodiment. It is a right side view which shows the main body and the pump unit in the state which removed the lid part of this embodiment. FIG. 5 is a vertical cross-sectional view taken along the line AA of FIG. 2A showing the main body and the pump unit in the state where the lid portion is removed according to the present embodiment. It is a rear view which shows the main body and the pump unit in the state which removed the lid part of this embodiment. It is a vertical cross-sectional view which shows the block body and a pump in the pump unit of this embodiment. It is a vertical cross-sectional view which shows the flow of the chemical liquid at the time of a normal administration of a block body and a pump in the pump unit of this embodiment. It is a vertical cross-sectional view which shows the flow of the chemical liquid when the bypass on-off valve is opened of the block body and a pump in the pump unit of this embodiment.

Next, the present invention will be described by taking up one embodiment. The dosing mechanism 1 of the present embodiment includes a main body 2 and a pump unit 3 that can be attached to and detached from the main body 2. As shown in FIG. 1, the dosing mechanism 1 is attached in the middle of the dosing route F from the drug container F1 such as an infusion bag to the patient P.

As shown in FIGS. 2A to 2D, the main body 2 is a part for holding the pump unit 3 and performing various detections, controls, and managements. As shown in FIG. 1, the drug container side tube F2 and the patient side tube F5 are connected to the pump unit 3 held by the main body 2. Although not shown for convenience of explanation, a lid that can be opened and closed is provided on the front side of the main body 2. When the lid is closed, it comes into contact with the side surfaces of the suction side tube 33 and the discharge side tube 34 of the pump unit 3, which will be described later. The upper side shown in FIGS. 2A to 2D is the drug container F1 side (suction side) when the medication mechanism 1 is used, and the lower side is the patient P side (discharge side) when the medication mechanism 1 is used.

The main body 2 includes a pump unit arrangement recess 22 which is a recess into which the pump unit 3 can be fitted. An electrical contact (not shown) on the main body side is provided on the bottom surface of the pump unit arrangement recess 22. When the pump unit 3 is fitted in the pump unit arrangement recess 22, electric power for driving the pump 31 can be supplied to the pump unit 3 from the electric contact on the main body side. Tube arrangement grooves 23 for arranging the suction side tube 33 and the discharge side tube 34 of the pump unit 3 are formed above and below the pump unit arrangement recess 22 in FIGS. 2A to 2D.

The main body 2 is provided with a sensor that can detect the liquid feeding status of the pump unit 3. As this sensor, in the present embodiment, a pressure sensor 24 and a bubble sensor 25 are provided. The pressure sensors 24 are provided at two locations on the main body 2, the drug container F1 side and the patient P side. However, it may be provided only at one place on the drug container F1 side or the patient P side.

Each pressure sensor 24 is provided at a position corresponding to the suction side tube 33 and the discharge side tube 34 in the pump unit 3 attached to the main body 2. The pressure sensor 24 utilizes a phenomenon in which when the pressure in the tube rises, the tube expands to expand the diameter of the tube, and when the pressure in the tube decreases, the tube contracts to reduce the diameter of the tube. Then, the pressure change in each of the tubes 33 and 34 is detected by the diameter and dimensional change of the suction side tube 33 and the discharge side tube 34.

Specifically, as shown in FIGS. 2A and 2C, each pressure sensor 24 is provided with a movable block 241 having a groove into which the tubes 33 and 34 are fitted so as to be movable between the front side and the back side. .. On the back surface side of the movable block 241 is an element 242 capable of outputting a voltage in reference to the received load, which is arranged in contact with the movable block 241. The tubes 33 and 34 are restricted from moving to the front side by the lid portion (not shown) of the main body 2. Therefore, the movable block 241 moves according to the expansion / contraction of the tubes 33 and 34, and the voltage output from the element 242 changes according to the load applied to the element 242, so that the inside of each tube 33 and 34 is changed. Pressure change can be detected.

If a blockage occurs in the middle section of the administration route F due to bending of the tube or the like, the pump is in a state where the drug solution is difficult to flow from the drug container F1 side when the blockage is on the upstream side of the pump 31 in the pump unit 3. Since 31 performs suction, the continuous drive of the pump 31 causes a negative pressure inside, and the suction side tube 33 contracts. On the other hand, in the case of obstruction on the downstream side of the pump 31, the pump 31 discharges the drug solution in a state where it is difficult for the drug solution to flow to the patient P side. Therefore, as the pump 31 continues to be driven, the inside becomes positive pressure and the discharge side tube 34 expands. To do. Therefore, the occurrence of blockage can be grasped by the detection of the pressure sensor 24. The pump unit 3 of the present embodiment is provided with a bypass flow path 35 and a bypass on-off valve 36 as a relief flow path for releasing an excess chemical solution generated at the time of closure so that no inconvenience occurs after the blockage is released. (See Fig. 3). This relief flow path will be described later.

In addition to these, the main body 2 includes, for example, a control unit 261 that controls the pump of the pump unit 3 and processes and stores the detection results of each sensor, an internal power supply unit 262 that arranges batteries, an external power input jack 263, and a drug container. A flow rate jack 264 that inputs the detection value of a flow rate sensor that detects the amount of dripping, etc., attached to a drip tube (not shown) located on the patient P side of F1, and communication that outputs medication history data and sensor detection results. A jack 265 for use may be provided. In addition, although not shown, it is equipped with a speaker for emitting an alarm sound, an LED lamp for displaying an alarm, a sensor for detecting that the lid is opened, and a liquid crystal display for displaying various information. May be good. Further, a portion for attaching a band or the like for attaching the main body 2 to the body of the patient P, a portion for attaching to a drip stand or the like used in a medical institution, or the like can be provided.

As shown in FIG. 1, the pump unit 3 has a pump 31 that sucks the chemical solution from the drug container F1 and discharges the drug solution to the patient P, a flow path on the pump inlet side that guides the drug solution from the drug container to the pump 31, and the drug solution. One of the pump outlet side flow path leading from the pump 31 to the patient P and the free flow prevention valve 32 that closes the pump outlet side flow path by the chemical pressure generated in the pump inlet side flow path when the pump 31 is not driven. Is provided with a bypass flow path 35 communicating with the pump inlet side flow path and the other communicating with the pump outlet side flow path, and a bypass on-off valve 36 for opening and closing the bypass flow path 35.

Further, the pump unit 3 includes a suction side tube (suction side pipe) 33 and a discharge side tube (discharge side pipe) 34. The pump 31, the free flow prevention valve 32, the bypass flow path 35, and the bypass on-off valve 36 are integrally formed. Therefore, the pump unit 3 can be easily attached to and detached from the main body 2. A joint may be provided between the block body 37 and the suction side tube (suction side pipe) 33, and between the block body 37 and the discharge side tube (discharge side pipe) 34.

The free flow prevention valve 32, the bypass flow path 35, and the bypass on-off valve 36 are built in the block body 37. The pump 31 is attached to the block body 37 so as to be integrated with the block body 37. Therefore, the pump unit 3 can be formed compactly. By forming the pump unit 3 compactly, it is possible to improve the efficiency of sterilization processing, reduce the transportation cost, reduce the storage space, and reduce the amount of waste. In particular, the waste treatment cost can be suppressed by reducing the amount of waste. Further, as compared with the configuration in which the pump and the pipe are housed in the case, for example, the flow path in the pump unit 3 can be shortened, so that the dead space can be reduced. Further, by shortening the flow path, the amount of the residual chemical solution in the flow path can be reduced. Therefore, when administering an expensive drug for rare diseases or a drug that requires management such as a drug for pain management, waste of the drug (drug solution) can be reduced, and the management load can also be reduced.

Further, for example, as compared with a configuration in which the free flow prevention valve 32, the bypass flow path 35, and the bypass on-off valve 36 are separately formed and connected to each other, there is a possibility of liquid leakage. Can be reduced.

The block body 37 is a plurality of (five in this embodiment) unit body 37a in which holes (for example, through holes or recesses) that serve as flow paths for drugs, which are components incorporated in the block body 37, are formed. It is formed by combining ~ 37e. According to this configuration, the block body 37 can be easily formed by combining a plurality of unit bodies 37a to 37e. Each unit body of the present embodiment is composed of a plate-shaped body. The shape of each unit is set to be suitable for each of the components. Then, the block body 37 can be formed by laminating a plurality of unit bodies 37a to 37e in the thickness direction. The plurality of units 37a to 37e are integrated by adhesion or uneven fitting. In the laminating, a gasket and an O-ring are appropriately sandwiched in order to suppress liquid leakage from the internal flow path of the block body 37 and liquid leakage to the outside of the block body 37. According to the above configuration, since the units 37a to 37e are plate-shaped bodies, the unit bodies are easy to assemble and the unit bodies are not bulky, so that the components of the pump unit 3 can be easily managed.

Inside the block body 37, there is an inlet side main flow path 371 which is a part of the pump inlet side flow path, an outlet side main flow path 372 which is a part of the pump outlet side flow path, a pump connection flow path 373, and a balance flow path 374. , The inlet side bypass flow path 375 and the outlet side bypass flow path 376, which are a part of the bypass flow path 35, are formed. In addition, a space is formed in which the diaphragm 321 of the free flow prevention valve 32 and the components of the bypass on-off valve 36 are arranged.

Although not shown, a pump unit-side electrical contact that can be connected to a main body-side electrical contact (not shown) is formed on the side surface of the block body 37 or the pump 31. Therefore, the block body 37 is arranged in the pump unit arrangement recess 22 of the main body 2, and the electric contact on the main body side and the electric contact on the pump unit side are electrically connected so that the pump 31 can be energized and driven. be able to.

The pump 31 can suck the liquid drug (drug solution) from the drug container F1 and discharge it to the patient P. In this embodiment, a diaphragm type pump is used. By adopting a diaphragm type pump as the pump 31, a motor is not required, so that the pump can be made smaller than a pump that requires a motor. Therefore, the pump unit 3 can also be miniaturized, so that the dosing mechanism 1 can be made lighter. Therefore, the burden on the patient P when carrying the dosing mechanism 1 is reduced, which is particularly advantageous for the patient P who needs to constantly administer the drug solution. In addition, the diaphragm type pump can control the amount of chemicals discharged with high accuracy.

As the pump 31 of the present embodiment, a pump utilizing the MEMS technology related to the integrated device, for example, the micropump described in Japanese Patent Application Laid-Open No. 2013-117211 is used.

Since the required volume of the pump 31 differs depending on the dose of the drug solution, a mark for identifying the volume can be displayed on the block body 37, or the shape of the block body 37 can be changed.

Further, since the control content of the pump 31 in the main body 2 (control unit 261) differs depending on the capacity of the pump 31, the mark displayed on the block body 37 and the shape of the block body 37 differ depending on the capacity of the pump 31 as described above. In this case, the main body 2 may recognize the shape of the mark or the block body, and the control content may be automatically changed by this recognition. Further, by providing an identifier such as an IC chip in the block body 37 and providing a reading means for the identifier in the main body 2, the control content is automatically changed only by attaching the pump unit 3 to the main body 2. You can also do it. When the identifier is provided in this way, the usage history of the pump unit 3 can be recorded in the identifier so that the pump unit 3 removed after use cannot be reused.

The free flow prevention valve 32 is provided to prevent an unintended flow of the chemical solution passing through the pump 31 due to the pressure of the chemical solution generated by gravity when the pump 31 is not driven. The free flow prevention valve 32 has a pump outlet side flow path (in this embodiment, a pump connection flow path 373 and an outlet side main flow path 371) due to chemical pressure generated in the pump inlet side flow path (inlet side main flow path 371 in this embodiment). The connection part with 372) is closed.

As shown in FIG. 3, the free flow prevention valve 32 has a pump connecting flow path 373 (connected to the discharge port 312 of the pump 31) and an outlet side main flow path 372 on one surface side (upper side in the drawing) of the diaphragm 321. Is provided, and a balance flow path 374 (connected to the inlet side main flow path 371) is formed on the other surface side (lower side in the drawing). The flow between the pump connecting flow path 373 and the outlet side main flow path 372 is configured to occur only when the diaphragm 321 moves. That is, when only the pressure of the chemical solution from the drug container F1 is applied to the diaphragm 321, the pressures of the pump connecting flow path 373 and the balance flow path 374 are in equilibrium, so that the diaphragm 321 is stationary and free flow. No flow occurs in the prevention valve 32. On the other hand, while the pump 31 is being driven, the pressure of the chemical solution pushed out by the pump 31 becomes higher than the pressure inside the balance flow path 374, so that the diaphragm 321 is deformed toward the balance flow path 374 as shown in FIG. 4A. To (deflect). As a result, the pump connecting flow path 373 and the outlet side main flow path 372 communicate with each other, so that a flow from the pump connecting flow path 373 to the outlet side main flow path 372 occurs. Since the free flow prevention valve 32 is provided in this way, the flow of the chemical solution can be made to occur in the pump unit 3 only while the pump 31 is being driven, and the unintended administration of the chemical solution to the patient P can be prevented.

The suction side tube 33 is a tube extending from the pump 31 to the drug container F1 side. The discharge side tube 34 is a tube extending from the pump 31 to the patient P side. These tubes 33 and 34 are made of a soft resin such as silicon rubber. Since changes in the diameters of the tubes 33 and 34 are detected by the pressure sensor 24 of the main body 2, the material (resin composition, density, etc.), pipe thickness, and pipe diameter are determined in advance at least in the portion arranged in the pressure sensor 24. It must be formed within a defined error range. Unlike the present embodiment, when the pressure change is not detected by using the pipe, a hard pipe can be used instead of the soft tube for the pump unit 3.

A connector 331, 341 is provided at the tip of each tube 33, 34. The connectors 331 and 341 are general-purpose products made of hard resin, and can be connected to the drug container side tube F2 and the patient side tube F5 (each connected to the connectors 331 and 341 of the pump unit 3 by screwing, for example, as shown in FIG. It is connected to connectors F3 and F4 having a shape that is in a "male" and "female" relationship. Since the pump unit 3 and the drug container side tube F2 can be separated and the pump unit 3 and the patient side tube F5 can be separated by the connectors 331 and 341, the distance between the drug container F1 and the patient P with respect to the dosing mechanism 1 can be freely set. Can be set to. Therefore, the tubes F2 and F5 are less likely to get in the way when the patient P carries the dosing mechanism 1.

The connectors 331 and 341 may be located only at the tip of at least one of the suction side tube 33 and the discharge side tube 34. When the connector is provided on only one side, the pump unit 3 includes the drug container F1 (or the drip tube located on the patient P side of the drug container F1 and not shown) on the side where the connector is not provided. Therefore, on the opposite side of the dosing mechanism 1, the pump unit 3 includes the needle F6 that is inserted into the patient P.

The inlet side bypass flow path 375 and the outlet side bypass flow path 376 connect the suction side tube 33 and the discharge side tube 34 without passing through the pump 31. As shown in FIG. 3, the inlet-side bypass flow path 375 is connected to the inlet-side main flow path 371, and the outlet-side bypass flow path 376 is connected to the outlet-side main flow path 372.

At the time of administration, as shown by an arrow in FIG. 4A, the drug solution that has entered the block body 37 from the suction side tube 33 enters the pump 31 from the suction port 311 via the inlet side main flow path 371 in the block body 37. Then, the chemical liquid discharged from the discharge port 312 of the pump 31 passes through the pump connecting flow path 373, a part of the balance flow path 374, and the outlet side main flow path 372 in sequence, exits the block body 37, and reaches the discharge side tube 34.

On the other hand, when the dosing route F is blocked and the bypass on-off valve 36 is opened, as shown by the arrow in FIG. 4B, the excess amount of the drug solution retained in the discharge side tube 34 is a block body. Enters 37 (backflow), exit side bypass flow path 376, communication flow path 377 (a flow path formed by moving the valve body 361 of the bypass on-off valve 36, which is a part of the bypass flow path 35), and an inlet. It passes through the side bypass flow path 375 in sequence, exits the block body 37, and reaches the suction side tube 33.

The presence of the bypass flow path 35 including the inlet side bypass flow path 375, the outlet side bypass flow path 376, and the communication flow path 377 configured in this way causes the suction side tube 33 and the discharge to be discharged when the bypass on-off valve 36 is opened. The side tube 34 can be communicated with the suction side tube 33 to return the excess drug solution when the administration route F is obstructed.

When a pump such as the diaphragm type pump in the present embodiment in which the volume of the portion to which the liquid is sent repeatedly expands and contracts is used, the tubes 34 and F5 connected to the discharge side of the pump unit 3 are blocked. Even if this occurs, due to the configuration of the pump 31, backflow through the pump 31 does not occur, so that the pump 31 may continue to be driven and a large amount of chemical solution may stay in the section from the pump 31 to the blocked portion. The bypass flow path 35 and the bypass on-off valve 36 are passed through the chemical solution when the excess amount of the chemical solution accumulated in the section from the pump 31 to the closed portion is returned to the suction side from the pump 31.

The bypass on-off valve 36 is provided in the middle of the bypass flow path 35, and can open and close the flow path of the bypass flow path 35. The bypass on-off valve 36 is a valve that opposes the urging of the valve body 361, the urging means 362 that urges the valve body 361 in the closing direction, and the urging means 362 that are movably provided inside the block body 37. A button 363 for moving the body 361 in the opening direction is provided.

The bypass on-off valve 36 is configured to be manually opened, and the medical worker or patient P pushes the button 363 shown in FIG. 3 into the block body 37 to push the valve body upward as shown in FIG. 4B. Move 361. As a result, a communication flow path 377 that communicates the inlet side bypass flow path 375 and the outlet side bypass flow path 376 is formed. As a result, the bypass on-off valve 36 is opened and the bypass flow path 35 is opened. When the hand is released from the button 363, the bypass on-off valve 36 is automatically closed by a spring or the like built in the block body 37. The reason for not allowing automatic opening is that when an obstruction occurs in the middle of the administration route F, it is necessary for the medical staff or the patient P to confirm the obstruction site and then investigate the cause of the obstruction. As a result, when the administration route F is obstructed, appropriate measures can be taken. However, depending on the assumed usage conditions, the bypass on-off valve 36 that automatically opens when the pressure of the bypass flow path 35 or the like exceeds a predetermined pressure can also be used.

The pump unit 3 of this embodiment can be disposable. Therefore, the dosing mechanism 1 can be used hygienically and safely. Although it depends on the type of the drug and the usage situation, the pump unit 3 is usually replaced in about 3 days, and in the longest case, in about 30 days. Disposable pump unit 3 eliminates the need for a discharge accuracy test performed by a clinical engineer (ME) at a medical institution. Therefore, the management of the dosing mechanism 1 in the medical institution becomes easy, and in the future, there is a possibility that the dosing mechanism 1 can be managed by a nurse or the like in each ward without the need for the hands of a clinical engineer.

Further, if the material and dimensional error are managed at least in the portion of the suction side tube 33 and the discharge side tube 34 that matches the pressure sensor 24, even if the pump unit 3 is replaced, the pressure sensor 24 can be supported. The diameter and hardness (easiness of diameter change) of the locally located tubes can be made almost the same. Therefore, unlike the case where the tube is prepared by a medical institution and connected to the dosing mechanism, the diameter and hardness of the tube can be less likely to vary, so that the pressure change can be reliably detected.

Next, a method of using this dosing mechanism 1 will be briefly described. First, the tube F2 extending from the drug container F1 and the tube F5 extending from the patient P side (attached to the tube F5 if the needle F6 is not provided) are connected to the pump unit 3. Then, the pump unit 3 in a state where the tube F2 and the tube F5 are connected is attached to the main body 2 to be in the state shown in FIG. If necessary, install a drip tube or flow sensor. Next, the air bubbles in the dosing route F are removed. Then, the needle F6 is pierced into the patient P. Next, the driving of the pump 31 is started. As a result, the drug solution is sent into the body of patient P by the pump 31.

When an obstruction occurs in the medication route F (particularly, when an obstruction occurs in the section of the medication route F on the patient P side of the pump 31), the pressure sensor 24 detects a warning by the control unit 261. (Notification by alarm sound or lighting of alarm lamp) is made. In response to this, the medical worker or the patient P stops the pump 31 (note that the pump 31 may be automatically stopped in conjunction with the notification of the warning), and then the patient rather than the main body 2. If an on-off valve (not shown) is provided on the P side, this on-off valve is closed. Then, the medical worker or the patient P opens the bypass on-off valve 36 of the pump unit 3. After that, the medical staff or patient P confirms the obstructed part and then releases the obstruction (for example, the flow path is secured by extending the bent tube). By opening the bypass on-off valve 36 before releasing the obstruction in this way, the excess amount of the drug solution accumulated in the section from the pump 31 to the obstruction portion is removed from the medication route F on the drug container F1 side of the pump 31. Can be returned to the section of. Therefore, it is safe because it is possible to prevent the excess drug solution that has accumulated due to the release of the obstruction from going to the patient P. Further, since the drug solution returned to the section on the drug container F1 side is again administered to the patient P by the pump 31, the excess drug solution generated by the occurrence of occlusion can be effectively used. After the occlusion is released, if there is an on-off valve on the patient P side, it is opened and the pump 31 is restarted to restart the administration of the drug solution.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, the free flow prevention valve 32 may not be built in the block body 37. In this case, inside the block body 37, an inlet side main flow path 371 which is a part of the pump inlet side flow path, an outlet side main flow path 372 which is a part of the pump outlet side flow path, and a pump connection flow path 373 (these are The two flow paths form a series of flow paths), an inlet side bypass flow path 375, and an outlet side bypass flow path 376 are formed.

Finally, the configuration and operation of the embodiment (including the modified form) will be summarized. The embodiment is used in a dosing mechanism 1 for administering a liquid drug filled in a drug container F1 to a patient P, and a pump 31 for sucking the drug from the drug container F1 and discharging the drug to the patient P. Pump inlet side flow path (inlet side main flow path) 371 that guides the drug from the drug container F1 to the pump 31, and pump outlet side flow path (outlet side main flow path) 372,373 that guides the drug from the pump 31 to the patient P. One of the pump units 3 communicates with the pump inlet side flow path (inlet side main flow path) 371, and the other communicates with the pump outlet side flow path (outlet side main flow path) 372 and 373. A bypass flow path 35 that communicates with the bypass flow path 35 and a bypass on-off valve 36 that opens and closes the bypass flow path 35 are provided, and the pump inlet side flow path (inlet side main flow path) 371 and the pump outlet side flow path (outlet side main flow path) are provided. ) A pump unit 3 including 372, 373 and a block body 37 in which the bypass flow path 35 is built.

According to this configuration, by opening the bypass on-off valve 36 before the blockage is released, the excess amount of the chemical solution accumulated in the section from the outlet of the pump 31 to the blockage portion is discharged to the pump inlet via the bypass flow path 35. It can be returned to the side flow path (inlet side main flow path) 371. Therefore, it is possible to prevent the retained drug solution from going to the patient P due to the release of the obstruction. Further, the block body 37 includes a pump inlet side flow path (inlet side main flow path) 371, a pump outlet side flow path (outlet side main flow path) 372, 373, and a bypass flow path 35. Therefore, the pump unit 3 can be formed compactly.

Then, when the pump 31 is not driven, free flow prevention that closes the pump outlet side flow path (outlet side main flow path) 372 and 373 by the chemical pressure generated in the pump inlet side flow path (inlet side main flow path) 371. A valve 32 is further provided, and the free flow prevention valve 32 can be built in the block body 37.

According to this configuration, the free flow prevention valve 32 can prevent an unintended flow of the chemical solution passing through the pump 31.

Further, the embodiment is used in a dosing mechanism 1 for administering a liquid drug filled in a drug container F1 to a patient P, and a pump 31 that sucks the drug from the drug container F1 and discharges the drug to the patient P. And the pump inlet side flow path (inlet side main flow path) 371 that guides the drug from the drug container F1 to the pump 31, and the pump outlet side flow path (outlet side main flow path) 372 that guides the drug from the pump 31 to the patient P. , 373, wherein one of the pump units 3 communicates with the pump inlet side flow path (inlet side main flow path) 371 and the other communicates with the pump outlet side flow path (the pump outlet side flow path). The bypass flow path 35 communicating with the outlet side main flow path) 372 and 373, the bypass on-off valve 36 for opening and closing the bypass flow path 35, the pump inlet side flow path (inlet side main flow path) 371, and the pump outlet side flow. A plurality of unit bodies 37a to 37e having a path (main flow path on the exit side) 372, 373 and a block body 37 in which the bypass flow path 35 is incorporated and forming a hole serving as a flow path for a drug are combined to form these unit bodies. This is a method for manufacturing a pump unit 3 in which the block body 37 is formed by arranging a combination of 37a to 37e so that the pump 31 and the bypass on-off valve 36 can be integrally formed.

According to this method, the block body 37 can be easily formed by combining a plurality of unit bodies 37a to 37e, and the pump 31 and the bypass on-off valve 36 can be integrally formed.

Each of the unit bodies is made of a plate-like body, and the block body 37 can be formed by laminating the plurality of unit bodies 37a to 37e in the thickness direction.

According to this method, since the unit body is a plate-like body, it is easy to assemble. Further, since the unit body is not bulky, it becomes easy to manage the components of the pump unit 3.

As described above, according to the above-described embodiment, it is possible to prevent the drug solution retained due to the release of the obstruction from heading toward the patient P, and it is possible to form the drug solution compactly. Therefore, even if a pipe such as a tube is obstructed, it is possible to prevent the excess drug solution from being administered to the patient P at once when the obstruction is released, and it is possible to contribute to the compactification of the dosing mechanism 1.

1 Dosing mechanism 2 Main body 3 Pump unit 31 Pump 32 Free flow prevention valve 35 Bypass flow path 36 Bypass on-off valve 37 Block body 371 Pump inlet side flow path, inlet side main flow path 372 Pump outlet side flow path, outlet side main flow path 373 Pump Outlet side flow path, pump connection flow path 374 Balance flow path 375 Bypass flow path, Inlet side bypass flow path 376 Bypass flow path, Outlet side bypass flow path 377 Bypass flow path, Communication flow path 37a to 37e Unit F1 Drug container P patient

Claims (2)

A pump used in a dosing mechanism for administering a liquid drug filled in a drug container to a patient, sucking the drug from the drug container and discharging the drug to the patient, and a pump for guiding the drug from the drug container to the pump. A pump unit including an inlet side flow path and a pump outlet side flow path for guiding a drug from the pump to a patient.
A block body having a built-in bypass flow path in which the pump inlet side flow path, the pump outlet side flow path, and one communicate with the pump inlet side flow path and the other communicate with the pump outlet side flow path, and the bypass. Further equipped with a bypass on-off valve that opens and closes the flow path,
A pump unit in which the pump and the bypass on-off valve are integrally formed in the block body by arranging the block body in combination with a plurality of units having holes forming a flow path for a drug. .. The pump unit according to claim 1, wherein each unit body is a plate-shaped body, and the block body is formed by laminating the plurality of unit bodies in the thickness direction.

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