Drug solution administration circuit

Abstract

To improve ease of use in a flow rate control unit.SOLUTION: A drug solution administration circuit 100 comprises: an upstream side flow path 101 on a drug solution container 200 side; a downstream side flow path 102 on a patient side; and a flow rate control unit 103. The flow rate control unit 103 includes: a case 142 having a skin placement portion 151 placed on a skin of a patient; an orifice tube 132 and a bypass tube 133 which are accommodated in the case 142 and connected in parallel to each other, wherein the bypass tube 133 has an inner diameter larger than that of the orifice tube 132; a bypass tube closing portion 166 which closes the bypass tube 133; and a lock portion 167 which regulates re-opening of the bypass tube 133 closed by the bypass tube closing portion 166.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a medical fluid administration circuit. [Background technology]

[0002] When continuously administering a small amount of medicinal liquid, such as a painkiller, to a patient, a medicinal liquid administration circuit that combines a balloon pump and a flow rate control unit using an orifice tube is sometimes used. By using a balloon pump and an orifice tube, it is easy to continuously administer medicinal liquid at a constant flow rate without using a power source (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 05-115542 Summary of the Invention [Problem to be solved by the invention]

[0004] These drug administration circuits are used to administer drugs such as anesthesia and anticancer drugs, so a stable flow rate is required. To achieve a constant flow rate, an orifice tube with a small inner diameter is often used. However, because the orifice tube is a thin-diameter resin tube, it is easily affected by changes in room temperature, which can lead to variations in the flow rate. Furthermore, because the flow rate of the orifice tube is only about 1 mL / h, the priming process, which fills the entire flow path from the balloon pump to the patient with drug solution, takes several minutes, making it difficult to use.

[0005] An object of the present disclosure is to provide a flow rate control unit that is easy to use. [Means for solving the problem]

[0006] A first aspect of the drug solution administration circuit of the present disclosure is a drug solution administration circuit that administers a drug solution in a drug solution container to a patient, and includes an upstream flow path on the drug solution container side, a downstream flow path on the patient side, and a flow control unit connected between the upstream flow path and the downstream flow path, and the flow control unit has a case with a skin placement portion that is placed on the patient's skin, an orifice tube and a bypass tube that are housed in the case and connected in parallel to each other and have an inner diameter larger than that of the orifice tube, a bypass tube closing portion that closes the bypass tube, and a locking portion that restricts the bypass tube from being reopened by the bypass tube closing portion.

[0007] According to the first aspect of the drug solution administration circuit, the flow control unit includes a skin placement unit. By attaching the case to the skin with tape or the like, the temperature inside the case can be adjusted to a temperature close to the patient's body temperature. This reduces the effects of room temperature and prevents variations in flow rate due to room temperature. Furthermore, the bypass tube has a larger inner diameter than the orifice tube, allowing priming at a high flow rate using the bypass tube, thereby shortening the priming time. Furthermore, the locking unit prevents the bypass tube from reopening after being closed by the bypass tube closing unit, thereby reducing the risk of unintended overdose due to the bypass tube being reopened after priming. The skin placement unit forms an outer surface facing the skin, which may be flat or curved, and is preferably shaped to conform to the skin.

[0008] In a first aspect of the drug solution administration circuit, the flow control unit may have an operating unit on the side of the case opposite the skin placement unit that closes the bypass tube closing unit. This configuration prevents the operating unit from damaging the patient's skin when the flow control unit is attached to the patient's skin. The operating unit may, for example, protrude from the outside of the case, and may be configured to close the bypass closing unit by being pressed or rotated.

[0009] In the first aspect of the drug solution administration circuit, the locking unit can be located inside the case. Since the locking unit inside the case is difficult to access, the risk of the bypass tube reopening due to an erroneous operation by the patient can be reduced. The locking unit can be configured to be able to release the restricted state using a dedicated tool, or the locking unit can be made inoperable, preventing the bypass tube from reopening.

[0010] In a first aspect of the drug solution administration circuit, the case has an opening that exposes the bypass tube, and the bypass tube closing unit is rotatably supported relative to the case and can pass through the opening to close the bypass tube. With this configuration, the bypass tube can be closed by rotating the bypass tube closing unit relative to the case, thereby improving operability. The bypass tube closing unit can be formed separately from the case or integrally with the case via a hinge or the like. Furthermore, an operation restriction unit can be provided that restricts the closing operation of the bypass tube closing unit to prevent unintended closure of the bypass tube. The operation restriction unit can be, for example, a member that applies operation resistance when the bypass tube closing unit enters the opening. The operation resistance can be generated, for example, by abutting and sliding the bypass tube closing unit and the opening. Furthermore, the operation restriction unit can also be a safety member that physically prevents the bypass tube closing unit from entering the opening. The safety member may be a removable lid that closes the opening, a member that is removably provided between the bypass tube closure and the case to prevent rotation, or the like.

[0011] In a first aspect of the drug solution administration circuit, the flow rate control unit has a flow path holding unit that holds any part of the downstream flow path, and the flow path holding unit can be configured to release the holding of the downstream flow path when the bypass tube closing unit closes the bypass tube. This configuration makes it difficult to reconfigure the downstream flow path and connect it to the patient until the bypass flow path is closed, thereby reducing the possibility of using the bypass tube while it is open.

[0012] In the first aspect of the drug solution administration circuit, the flow rate control unit may have an operation restriction unit that restricts the bypass tube closing unit from being displaced so as to close the bypass tube. This configuration makes it less likely that the bypass tube will be closed by mistake before priming is complete, thereby improving usability.

[0013] The first aspect of the medicinal solution administration circuit may further include a rapid administration unit connected in parallel to the flow rate control unit and configured to temporarily increase the amount of medicinal solution administered to the patient in response to an operation by the patient. This configuration enables rapid administration in which the amount administered is temporarily increased in response to an operation by the patient.

[0014] A first aspect of the medicinal solution administration circuit can be configured without a rapid administration unit that temporarily increases the amount of medicinal solution administered to a patient through operation by the patient. This configuration simplifies the configuration of the administration circuit, making priming easier.

[0015] A second aspect of the drug solution administration circuit is a drug solution administration circuit for administering drug solution from a drug solution container to a patient. The drug solution administration circuit includes an upstream flow path on the drug solution container side, a downstream flow path on the patient side, and a flow control unit connected between the upstream flow path and the downstream flow path. The flow control unit includes a case, an orifice tube housed in the case and connected in parallel with the orifice tube, a bypass tube having an inner diameter larger than that of the orifice tube, a bypass tube closing unit for closing the bypass tube, and a locking unit for preventing the bypass tube from reopening via the bypass tube closing unit. The flow control unit does not include a temporary storage unit for storing drug solution that has passed through the orifice tube and the bypass tube and for releasing it upon patient operation. This configuration allows the flow control unit to be miniaturized, thereby improving the flexibility of its shape. It can be easily shaped to be suitable for placement on the patient's skin, and the orifice tube can be less susceptible to changes in room temperature. Furthermore, it is less likely to accidentally close the bypass tube before priming is complete, improving usability.

[0016] A third aspect of the drug solution administration circuit is a drug solution administration circuit for administering drug solution from a drug solution container to a patient, comprising an upstream flow path on the drug solution container side, a downstream flow path on the patient side, and a flow control unit connected between the upstream flow path and the downstream flow path. The flow control unit includes a plate-shaped case, an orifice tube housed in the case and connected in parallel with the orifice tube, a bypass tube having an inner diameter larger than that of the orifice tube, a bypass tube closing unit that closes the bypass tube, and a locking unit that prevents the bypass tube closing unit from reopening. The plate-shaped case makes it easier to place on the patient's skin and reduces the susceptibility of the orifice tube to changes in room temperature. Furthermore, it is less likely to accidentally close the bypass tube before priming is complete, improving usability.

[0017] A fourth aspect of the drug solution administration circuit is a drug solution administration circuit for administering a drug solution from a drug solution container to a patient, the drug solution administration circuit comprising an upstream flow path on the drug solution container side, a downstream flow path on the patient side, and a flow control unit connected between the upstream flow path and the downstream flow path. The flow control unit has a flow path holding unit that holds a portion of the downstream flow path. The flow path holding unit includes an orifice tube and a bypass tube having an inner diameter larger than that of the orifice tube, a bypass tube closing unit that closes the bypass tube, and a holding unit that removably holds the downstream flow path. The holding unit holds the downstream flow path in a state before the bypass tube closing unit closes the bypass tube, and can release the holding of the downstream flow path by closing the bypass tube with the bypass tube closing unit. This configuration prevents a user from administering drug solution before closing the bypass tube. Furthermore, the downstream flow path can be operated by a single operation of closing the bypass tube with the bypass tube closing unit, improving usability.

[0018] In the second to fourth aspects of the drug solution administration circuit, various preferred aspects similar to those in the first aspect can be combined. [Effects of the Invention]

[0019] The medical solution dispensing circuit of the present disclosure can reduce the influence of room temperature and improve ease of use, or can reduce the possibility of using the medical solution dispensing circuit with the bypass tube left open. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is a diagram illustrating a medical solution administration circuit according to one embodiment. [Figure 2] FIG. 2 is a side view showing a flow rate control unit of a drug solution administration circuit according to one embodiment. [Figure 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a plan view showing the lower part of the case. DETAILED DESCRIPTION OF THE INVENTION

[0021] As shown in Figure 1, one embodiment of a drug solution administration circuit 100 has an upstream flow path 101 connected to a balloon infuser 200 that serves as both a container for storing the drug solution and a pump for delivering the drug solution, a downstream flow path 102 connected to a patient, and a flow control unit 103 connected between the upstream flow path 101 and the downstream flow path 102.

[0022] The flow rate control unit 103 has a case 142, and an orifice tube 132 and a bypass tube 133 connected in parallel to each other. As shown in FIGS. 2 to 4, a movable plate portion 143 is rotatably attached to the case 142.

[0023] The case 142 has a generally rectangular parallelepiped shape with a cavity therein for accommodating the orifice tube 132 and the bypass tube 133. In this embodiment, the case 142 is formed by combining a lower portion 142a and an upper portion 142b. The orifice tube 132 and the bypass tube 133 are accommodated in parallel to each other along the longitudinal direction of the case 142. The bottom surface of the case 142 is a flat skin placement surface 151, and an opening 155 is formed in a top surface 152 opposite the bottom surface, which exposes the accommodated bypass tube 133.

[0024] The movable plate 143 is supported by the case 142 at a first end, and the second end is a free end. The movable plate 143 is rotatable from a first position where the free end is separated from the top surface 152 of the case 142 to a second position where the free end abuts against the top surface 152. A pressing protrusion 166 that presses the bypass tube 133 exposed from the opening 155 is formed on the movable plate 143 at a position that coincides with the opening 155 in the second position. By rotating the movable plate 143 from the first position to the second position, the pressing protrusion 166 is inserted into the opening 155 and presses against the bypass tube 133 to close it. Note that the second end of the movable plate 143 may be a fixed end, and the first end may be a free end.

[0025] In this embodiment, the pressing protrusion 166 functions as a bypass tube closing portion that closes the bypass tube, and the movable plate portion 143 functions as an operating portion for performing the closing operation by the bypass tube closing portion.

[0026] A main body-side locking portion 157 is formed on the side of the opening 155, and a movable part-side locking portion 167 is formed on the movable plate portion 143 at a position that engages with the main body-side locking portion 157 when the movable plate portion 143 is in the second position. The main body-side locking portion 157 and the movable part-side locking portion 167 function as a locking portion that prevents the movable plate portion 143, which has rotated to the second position, from returning to the first position, thereby restricting the reopening of the bypass tube 133. Therefore, when the movable plate portion 143 is moved from the first position to the second position to close the bypass tube 133, the bypass tube 133 cannot be reopened.

[0027] The main body side locking portion 157 and the movable part side locking portion 167 can be configured in various ways to prevent easy disengagement once they are engaged. For example, they can be configured as claws with barbs so that they can easily climb over each other and engage but cannot return in the opposite direction. In this embodiment, the locking portion is provided inside the opening 155, making it difficult to access the locking portion after it is activated, thereby further improving reliability. From the perspective of making it difficult to access from the outside after it is activated, it is preferable to provide the locking portion inside the case 142. However, there are no particular restrictions on the location of the locking portion.

[0028] In this embodiment, the movable plate 143, which rotates around the second end portion as a fulcrum, is formed with a pressing protrusion 166 and a movable portion-side locking portion 167. In this case, when the second end portion of the movable plate 143 is pressed, a large force is applied by this principle to the pressing protrusion 166 and the movable portion-side locking portion 167, which are the points of action, so that the bypass tube 133 can be easily pressed closed and locked.

[0029] The length of movable plate portion 143 is not particularly limited, but from the viewpoint of not getting in the way, it is preferably equal to or less than the length of case 142 so that it does not protrude from case 142. The width of movable plate portion 143 is also preferably equal to or less than the width of case 142. It is also preferable from the viewpoint of safety that there is no portion that protrudes outside case 142 when movable plate portion 143 is in the second position, because this makes it difficult to apply force that would forcefully pry open movable plate portion 143.

[0030] From the viewpoint of locking after the bypass tube 133 is pressed closed by the pressing protrusion 166, it is preferable to form the movable part-side locking part 167 closer to the second end than the pressing protrusion 166. The position of the pressing protrusion 166 is not particularly limited, but from the viewpoint of providing play so that pressing begins from a position where the movable plate part 143 has been moved to a certain extent, it is preferable to form it closer to the second end than the center between the first end and the second end.

[0031] If a pressing closing portion that presses the bypass tube 133 to close is provided on the rotating movable plate portion 143, the bypass tube 133 can be easily pressed to close by pinching it with one hand or pressing the movable plate portion 143 from above. However, the bypass tube closing portion can also be configured in a different way. For example, a button-shaped pressing closing portion provided on the opening 155 can be configured to press the bypass tube 133 to close by pressing it from above, or to press the bypass tube 133 to close by sliding it horizontally.

[0032] In this embodiment, the bottom surface of the case 142 is a flat skin placement surface 151. This allows the case 142 to be easily placed on the patient's arm or the like. It can also be easily secured to the arm or the like with tape, a belt, or the like. By placing the case 142 on the patient's skin, the temperature of the case 142 is maintained close to body temperature, making it less susceptible to the influence of room temperature. This makes it less likely that the flow rate will fluctuate due to temperature changes in the orifice tube 132, enabling the administration of medicinal liquid at a more accurate flow rate.

[0033] In this embodiment, when the movable plate portion 143 is moved to the second position, the flow control portion 103 becomes a thin box-like shape with no large protrusions. Therefore, for example, the flow control portion 103 can be fixed to the arm and placed under the sleeve of clothing. This greatly improves convenience for the patient. It also improves temperature stability.

[0034] The skin placement surface 151 of the case 142 is not particularly limited as long as it can be placed on the patient's skin, but it is preferably a flat surface without any irregularities. Also, from the viewpoint of stability, it is preferably flat. It can also be a slightly curved surface to make it easier to place on the arm, etc.

[0035] The operating unit that performs the operation to close the bypass tube, including the movable plate portion 143, is preferably provided on the surface opposite to the skin placement surface 151. Operating units that are operated from the outside are prone to having protruding or sharp parts. By placing such an operating unit on the opposite side of the skin placement surface 151, parts that may cause discomfort or injury to the patient if they come into contact with the skin can be kept away from the patient, resulting in a safer device.

[0036] The size of case 142 is not particularly limited, but considering that it will be placed on the patient's arm, etc., it is preferable that the width be approximately 2 cm to 6 cm, the length be approximately 5 cm to 12 cm, and the thickness be approximately 0.5 cm to 2 cm.

[0037] The upstream flow path 101 is connected to an upstream connector 171 fixed to the second end side of the case 142. The downstream flow path 102 is connected to a downstream connector 172 fixed to the first end side. The upstream connector 171 and the downstream connector 172 are branch connectors, and the orifice tube 132 and the bypass tube 133 are connected in parallel between the upstream connector 171 and the downstream connector 172.

[0038] The inner diameter and length of the orifice tube 132 can be selected depending on the required flow rate. For example, the inner diameter can be approximately 0.05 mm to 0.30 mm, and the length can be approximately 30 mm to 300 mm. In this embodiment, the orifice tube 132 connects the upstream connector 171 and the downstream connector 172 in a straight state, but a long orifice tube 132 can be connected between the upstream connector 171 and the downstream connector 172 in a folded or looped state.

[0039] The bypass tube 133 has an inner diameter larger than that of the orifice tube 132 so as to shorten the priming time. The inner diameter of the bypass tube 133 can be appropriately selected depending on the priming flow rate, etc., and can be approximately 0.5 mm to 8 mm. The bypass tube 133 can have, for example, approximately the same inner diameter as the tubes of the upstream flow path 101 and the downstream flow path 102. The bypass tube 133 preferably has a wall thickness of approximately 0.3 mm to 2 mm so as to be less likely to kink and to be easily pressed to close.

[0040] In this embodiment, the orifice tube 132 and the bypass tube 133 are housed in recesses 174 and 175, respectively, provided in the lower portion 142a of the case 142. An opening 155 formed in the upper portion 142b of the case 142 is formed to expose the recess 175 in which the bypass tube 133 is housed. This prevents the pressing protrusion 166 inserted into the opening 155 from unintentionally closing the orifice tube 132. A guide plate 176 is provided in the recess 175 in which the bypass tube 133 is housed, preventing the bypass tube 133 from being significantly misaligned when positioned at the center of the recess 175 in the width direction. This makes it less likely that the pressing protrusion 166 inserted into the opening 155 will be misaligned with the bypass tube 133.

[0041] The width of the pressing protrusion 166 is approximately equal to the width of the opening 155, making it difficult for the pressing protrusion 166 to become misaligned. In addition, a bump 166a is formed on the side of the pressing protrusion 166, so that when the pressing protrusion 166 is inserted into the opening 155, it abuts against the side of the opening 155 and slides, generating operational resistance. This allows the operator to feel that the closing operation is being performed, making it less likely for an erroneous operation to occur. Note that the method is not limited to providing the bump 166a on the pressing protrusion 166, and various other methods can be used to generate operational resistance at the start of or during the closing operation. In addition, an operational resistance generating portion may be provided as needed, or may not be provided at all.

[0042] Furthermore, the operation regulating unit that makes it difficult for the bypass tube 133 to be unintentionally closed is not limited to an operation resistance generating unit, and may have other configurations. For example, a safety member that prevents the pressing protrusion 166 from being physically inserted into the opening 155 may be provided. The safety member may be, for example, a removable member that covers the opening 155, or a removable member that is inserted between the movable plate 143 and the upper surface of the case 142 to prevent the movable plate 143 from rotating to the second position. Both an operation resistance generating unit and a safety member may be provided.

[0043] A mounting hinge 168 that protrudes laterally and stands upright is provided on the first end side of the movable plate portion 143. A mounting pin 158 that protrudes laterally is formed near the first end of the case 142, and the mounting pin 158 is inserted into a mounting hole formed in the mounting hinge 168. This allows the movable plate portion 143 to rotate relative to the case 142, with the first end side serving as a fixed end. The method of attaching the movable plate portion 143 to the case 142 is not limited to this method, and various other methods can be used. The top surface 152 of the case 142 near the first end can be cut at an angle so that the movable plate portion 143 does not interfere with the top surface 152 when it is rotated.

[0044] The movable plate portion 143 has a flow path holding portion 169 at its first end. In this embodiment, the flow path holding portion 169 is an inverted L-shaped member in which a horizontal plate and a vertical plate intersect at right angles, and protrudes longitudinally from the first end of the movable plate portion 143. A gap capable of holding the tube of the downstream flow path 102 is formed between the vertical plate of the flow path holding portion 169 and the first end face of the case 142. When the movable plate portion 143 is in the first position and the bypass tube 133 is open, the tip of the vertical plate of the flow path holding portion 169 is close to the first end face, so the tube cannot pass between the tip of the vertical plate and the first end face and is maintained in a state held by the flow path holding portion 169. When the movable plate portion 143 is moved to the second position to close the bypass tube 133, the tip of the vertical plate moves away from the first end face, so that the tube can be released from the hold of the flow path holding portion 169. When the tube of the downstream flow path 102 is held in the flow path holding unit 169, it is difficult to move around the downstream flow path 102, which prevents the user from erroneously administering a medicinal solution while the bypass tube 133 is in the open priming mode. The flow path holding unit can have various configurations that release the holding in conjunction with the closure of the bypass tube. Furthermore, the flow path holding unit may be provided as needed, or may not be provided at all.

[0045] In this embodiment, the downstream flow path 102 has a filter 105 for removing foreign matter and air bubbles. The filter may be provided as needed, or may not be provided. A connector 106 is attached to the end of the downstream flow path 102, and the connector 106 is configured to be connectable to a tube extending from a needle inserted into a patient's blood vessel. However, the downstream flow path 102 is not limited to this configuration and can have various other configurations that allow for supply of a medicinal solution to a patient. In this embodiment, the upstream flow path 101 is directly connected to the balloon infuser 200. However, the upstream flow path 101 is not limited to this configuration and can have various other configurations that allow for connection to the balloon infuser 200. For example, a clamp may be provided, a balloon infuser may be connected via a connector, or a filter may be provided. Furthermore, the medicinal solution container connected to the upstream flow path 101 is not limited to a balloon infuser, and various other configurations may be adopted.

[0046] A rapid administration unit 300 can also be provided in parallel with the flow rate control unit 103. For example, branches can be provided in the upstream flow path 101 and the downstream flow path 102, and the rapid administration unit 300 can be connected to them. The rapid administration unit 300 includes a temporary storage unit that stores the medicinal liquid, an administration operation unit that sends the medicinal liquid stored in the temporary storage unit to the patient in one go, a storage control unit that stores the medicinal liquid in the reservoir over a predetermined time, and the like. The provision of the rapid administration unit 300 makes it possible to perform methods such as self-controlled analgesia (PCA), in which the patient himself or herself can increase the dosage within a certain range. [Industrial Applicability]

[0047] The liquid medicine administration circuit of the present disclosure is useful in the medical field, such as in administering liquid medicine. [Explanation of symbols]

[0048] 100 Chemical solution administration circuit 101 Upstream flow path 102 Downstream flow path 103 Flow control section 105 filters 106 Connector 132 Orifice tube 133 Bypass tube 142 cases 142a lower part 142b upper part 143 Movable plate part 151 Skin placement surface 152 Top 155 Opening 157 Main unit lock 158 Mounting pin 166 Pressing convex part 166a Bump 167 Movable part side lock part 168 Mounting hinge 169 Flow path holder 171 Upstream Connector 172 Downstream Connector 174 recess 175 recess 176 Guide plate 200 Balloon Infuser 300 Rapid administration unit

Claims

1. A medical solution administration circuit for administering a medical solution in a medical solution container to a patient, an upstream flow path on the drug solution container side; the downstream flow path on the patient side; a flow rate control unit connected between the upstream flow path and the downstream flow path, The flow control unit is a drug solution administration circuit having a case with a skin placement portion to be placed on the patient's skin, an orifice tube and a bypass tube having an inner diameter larger than that of the orifice tube that are housed in the case and connected in parallel to each other, a bypass tube closing portion that closes the bypass tube, and a locking portion that restricts the bypass tube closing portion from reopening.

2. The drug solution administration circuit according to claim 1 , wherein the flow rate control unit has an operation unit that performs a closing operation on the bypass tube closing unit on the opposite side of the case from the skin placement unit.

3. The drug solution administration circuit according to claim 1 , wherein the locking portion is located inside the case.

4. the case has an opening for exposing the bypass tube; The drug solution administration circuit according to claim 1 , wherein the bypass tube closing portion is rotatably supported relative to the case and passes through the opening to close the bypass tube.

5. the flow rate control unit has a flow path holding unit that holds any part of the downstream flow path, The drug solution administration circuit according to claim 1 , wherein the flow path holding section releases the holding of the downstream flow path by the bypass tube closing section closing the bypass tube.

6. The liquid medicine administration circuit according to claim 1 , wherein the flow rate control unit has an operation restricting unit that restricts the bypass tube closing unit from being displaced so as to close the bypass tube.

7. The medicinal solution administration circuit according to claim 1 , further comprising a rapid administration unit connected in parallel with the flow rate control unit and configured to temporarily increase the amount of medicinal solution administered to the patient in response to an operation by the patient.

8. 2. The medical solution administration circuit according to claim 1, which does not have a rapid administration unit that temporarily increases the amount of medical solution administered to the patient in response to an operation by the patient.

9. A medical solution administration circuit for administering a medical solution in a medical solution container to a patient, an upstream flow path on the drug solution container side; the downstream flow path on the patient side; a flow rate control unit connected between the upstream flow path and the downstream flow path, The flow control unit has a case, an orifice tube and a bypass tube having an inner diameter larger than that of the orifice tube housed in the case and connected in parallel, a bypass tube closing unit that closes the bypass tube, and a lock unit that restricts the bypass tube closing unit from reopening the bypass tube, and the drug solution administration circuit does not have a temporary storage unit that stores the drug solution that has passed through the orifice tube and the bypass tube and releases it when operated by the patient.

10. A medical solution administration circuit for administering a medical solution in a medical solution container to a patient, an upstream flow path on the drug solution container side; the downstream flow path on the patient side; a flow rate control unit connected between the upstream flow path and the downstream flow path, The flow control unit is a drug solution administration circuit having a plate-shaped case, an orifice tube and a bypass tube having an inner diameter larger than that of the orifice tube housed in the case and connected in parallel, a bypass tube closing unit that closes the bypass tube, and a locking unit that restricts the bypass tube closing unit from reopening.

11. A medical solution administration circuit for administering a medical solution in a medical solution container to a patient, an upstream flow path on the drug solution container side; a downstream flow path on the patient side; a flow rate control unit connected between the upstream flow path and the downstream flow path, the flow rate control unit has a flow path holding unit that holds any part of the downstream flow path, the flow path holding portion includes an orifice tube, a bypass tube having an inner diameter larger than that of the orifice tube, a bypass tube closing portion that closes the bypass tube, and a holding portion that detachably holds the downstream flow path, The holding portion holds the downstream flow path in a state before the bypass tube closing portion closes the bypass tube, and releases the holding of the downstream flow path when the bypass tube closing portion closes the bypass tube.

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