JP2014100421A - Medical reservoir - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical reservoir configured to keep a stable delivery flow rate without depending on the liquid level of a storage tank, and close a passage to eliminate the delivery risk of bubbles when a medical solution or blood in the storage tank is equal to or lower than the liquid level.SOLUTION: A medical reservoir 100 accommodates a valve body 140 in a cylindrical wall 131, which moves in the vertical direction with the vertical movement of a medical solution stored in a storage tank 110 to move a guide hole 130h in the vertical direction, and intercepts the communication with a delivery hole 120h of a delivery port 120 in the state where the valve body 140 is at least partly located under the liquid level of the medical solution and located at the lowermost end of the guide hole 130h.

Description

  The present invention relates to a medical reservoir, and more particularly to a medical reservoir structure in which a drug solution or blood is stored.

  In extracorporeal blood circulation using an artificial lung, venous blood that has been removed from the venous line of the human body via the blood removal line is temporarily stored in a blood reservoir. The blood in the blood reservoir is sent to the oxygenator using an infusion pump (roller pump or blood pump). The blood sent to the oxygenator is gas-exchanged (hereinafter referred to as “blood after gas exchange”), and is returned to the human artery via the blood return line.

  In heart surgery (open heart surgery) and the like, it is necessary to temporarily stop the heartbeat of the heart, so that a myocardial protective solution is used as a chemical solution in the blood that is returned to the human artery via the blood return line. Added.

  The myocardial protective solution is stored in a medical reservoir, and a certain amount of myocardial protective solution is returned to the human artery together with the blood after gas exchange by a chemical liquid line and a roller pump connected to the medical reservoir. In a blood reservoir (medical reservoir) used for extracorporeal blood circulation using an artificial lung, a certain amount of blood is returned to the human artery by a blood return line and a roller pump.

  An example of a blood reservoir used for extracorporeal blood circulation using an artificial lung is Japanese Patent Laid-Open No. 06-39032 (Patent Document 1).

Japanese Patent Laid-Open No. 06-39032

  In Patent Document 1, in order to prevent air bubbles from being mixed into the pipeline when the blood volume in the blood reservoir decreases, when the blood volume in the blood reservoir decreases, the blood has a predetermined liquid level. A configuration is employed that uses a diaphragm that closes the flow path when it becomes lower and prevents the inflow of bubbles into the pipeline. However, the configuration using the diaphragm has a problem in that the flow rate of blood depends on the liquid level because the degree of blockage of the flow path varies depending on the liquid level of the blood reservoir.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to connect a chemical solution or blood in a pipe line to a pipe line sent out by an infusion pump, and store the chemical liquid or blood. In a medical reservoir used for supplying chemical solution or blood to the reservoir, a stable delivery flow rate can be maintained without depending on the liquid level of the storage tank, and the chemical liquid or blood in the storage tank is at a predetermined liquid level. When it becomes below, it is providing the medical reservoir provided with the structure which obstruct | occludes a flow path and eliminates the risk of sending out bubbles.

  In the medical reservoir according to the present invention, the drug solution or blood in the pipeline is connected to the pipeline that is sent out by an infusion pump, and stores the drug solution or blood, and stores the drug solution or blood in the pipeline. Is a medical reservoir that supplies the following.

  A storage tank that forms a storage region for storing the drug solution or the blood therein, and a pipe line connected to the storage tank and provided on the bottom side of the storage tank, and the drug solution or the blood in the storage tank are connected to the pipe line A delivery port that forms a delivery hole for delivery to the storage tank, and a cylindrical guide hole that is provided inside the storage tank, has a lower end communicating with the delivery hole, an upper end extending upward of the storage tank, and a closed upper end And a cylindrical wall provided with a communication hole communicating with the storage region, and the guide hole is accommodated in the cylindrical wall so as to be movable in the vertical direction and stored in the storage tank. In the state where the drug solution or the blood level of the blood moves up and down as the liquid level moves, and at least a portion is located below the level of the drug solution or the blood and positioned at the lowest end of the guide hole, Sending port And a valve body to block the communication between the bets of the delivery hole.

  In another embodiment, the storage tank includes a first side wall and a second side wall that are arranged to face each other, and the second side wall is lower than the upper side of the storage tank with the first side wall. The cylindrical wall is inclined so as to be close, and the cylindrical wall is disposed in contact with the first side wall, and the first side wall constitutes a part of the cylindrical wall.

  In another form, the area | region which comprises a part of said cylindrical wall of the said 1st side wall forms the said valve body accommodated in the said guide hole with the member visually recognizable from the exterior of the said storage tank. Has been.

  In another form, the outer peripheral surface of the lower end side of the valve body includes an outer surface area that narrows downward, and the inner peripheral surface that communicates with the delivery port of the cylindrical wall has the valve body that is the guide hole. In the state located at the lowermost end of the inner surface, an inner surface region that narrows downward so as to closely contact the outer surface region is included.

  According to the medical reservoir based on this invention, it is possible to maintain a stable delivery flow rate without depending on the liquid level of the storage tank, and the chemical solution or blood in the storage tank is below a predetermined liquid level. In this case, it is possible to provide a medical reservoir having a configuration that closes the flow path and eliminates the risk of air bubble delivery.

3 is a schematic diagram illustrating an example of an overall configuration of a myocardial protection circuit according to Embodiment 1. FIG. 2 is an overall perspective view showing an appearance of a medical reservoir used in the myocardial protection circuit in Embodiment 1. FIG. FIG. 3 is a front view showing an appearance of a medical reservoir used in the myocardial protection circuit in the first embodiment. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 2. FIG. 3 is an overall perspective view showing an appearance of a valve body used for the medical reservoir in the first embodiment. 2 is an enlarged cross-sectional view of the vicinity of a delivery port of a medical reservoir in Embodiment 1. FIG. FIG. 3 is a first view showing a movement state of a valve body due to a change in a liquid level in a medical reservoir in the first embodiment. FIG. 6 is a second diagram showing a movement state of the valve body due to a change in the liquid level in the medical reservoir in the first embodiment. FIG. 6 is a third view showing a movement state of the valve body due to a change in the liquid level in the medical reservoir in the first embodiment. FIG. 10 is a cross-sectional view showing the lowest end shape of the guide hole of the medical reservoir and the structure of the valve body in the second embodiment. FIG. 5 is an overall perspective view showing an appearance of a valve body used for a medical reservoir in a second embodiment. (A), (b), (c) is sectional drawing which shows the other form of the cross-sectional shape of the valve body used for the medical reservoir in Embodiment 2. FIG. FIG. 10 is a cross-sectional view showing the lowest end shape of a guide hole of a medical reservoir and the structure of a valve body in a third embodiment. FIG. 10 is an overall perspective view showing an external appearance of a valve body used for a medical reservoir in a third embodiment. It is sectional drawing which shows the lowest end shape of the guide hole of the medical reservoir in Embodiment 4, and the structure of a valve body. FIG. 18 is a cross-sectional view taken along line XVIII-XVIII in FIG. 17.

  The medical reservoir in each embodiment based on the present invention will be described below with reference to the drawings. In each embodiment described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In addition, it is planned from the beginning to use a combination of the configurations shown in the embodiments as appropriate.

(Embodiment 1)
Hereinafter, the structure of the medical reservoir in the present embodiment will be described with reference to FIGS. FIG. 1 is a schematic diagram illustrating an example of the entire configuration of a myocardial protection circuit according to the present embodiment. FIG. 2 is an overall perspective view illustrating an appearance of a medical reservoir 100 used in the myocardial protection circuit according to the present embodiment. 3 is a front view showing the external appearance of the medical reservoir 100, FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 2 is a sectional view taken along line VI-VI in FIG. 2, FIG. 7 is an overall perspective view showing the external appearance of the valve element 140 used in the medical reservoir 100, and FIG. 8 is an enlarged cross section near the delivery port 120 of the medical reservoir 100. FIG.

(Myocardial protection circuit)
First, an example of the overall configuration of a myocardial protection circuit used for heart disease surgery (open heart surgery) in extracorporeal blood circulation using an artificial lung will be described with reference to FIG. The post-gas exchanged blood gas exchanged by the oxygenator 500 is led out to the blood return line L2. The medical reservoir 100 in which the myocardial protective liquid is stored is connected with a chemical liquid line L1 made of a tube as a conduit. In the present embodiment, two medical reservoirs 100 are shown. The chemical liquid line L1 is provided with a channel switching cock (not shown).

  The medicinal solution line L1 and the blood return line L2 are fed into the single blood return line L3 after a certain amount is sent out by the action of the infusion pump P1, and then the myocardial protective solution is mixed with the blood after gas exchange. The blood return line L3 is provided with a heat exchanger 600, which warms the blood after gas exchange in the blood return line L3 to a predetermined temperature. Thereafter, the blood after gas exchange is returned to the human artery (heart) H1.

(Medical reservoir 100)
Next, the structure of the medical reservoir 100 in the present embodiment will be described with reference to FIGS. The medical reservoir 100 in the present embodiment is connected to the chemical liquid line L1, stores the myocardial protective liquid (chemical liquid), and supplies the myocardial protective liquid to the chemical liquid line L1.

  With reference to FIG. 3 and FIG. 4, the medical reservoir 100 in the present embodiment is a resin molded product, and includes a storage tank 110 that forms a storage area 110 a that stores a myocardial protective liquid inside, and a storage tank 110. And a lid 170 that closes the opening at the upper end. The storage tank 110 includes a first side wall 110A and a second side wall 110B that face each other, and the second side wall 110B is closer to the first side wall 110A on the lower side than the upper side of the storage tank 110. It is inclined to become.

  110 A of 1st side walls are the 1st upper side wall part 111 extended in an up-down direction, the 1st inclination wall 112 provided in the intermediate region of 110 A of 1st side walls, and inclined toward the 2nd side wall 110B side, and the 1st side wall 110A extended in an up-down direction. 1 lower side wall portion 113.

  The second side wall 110B extends in the up-down direction and is inclined gently toward the first side wall 110A side, a second inclined wall 115 that is largely inclined toward the first side wall 110A side, An intermediate side wall portion 116 that is gently inclined toward the first side wall 110A side, a third inclined wall 118 that is greatly inclined toward the first side wall 110A side, and a bottom wall portion 119 that is gently inclined toward the first side wall 110A side Have

  The dimensions of the medical reservoir 100 in this embodiment (see FIG. 3) are as follows: H = about 339 mm, W = about 226 mm, H11 = about 140 mm, H12 = about 35 mm, H13 = about 164 mm, H14 = about 147 mm, H15 = About 23 mm, H16 = about 115 mm, H17 = about 18 mm, H18 = about 36 mm, W1 = about 20 mm, W2 = about 36 mm, W3 = about 55 mm, W4 = about 24 mm, W5 = about 62 mm, W6 = about 26 mm is there. The thickness of the medical reservoir 100 (D: FIG. 5) is about 50 mm.

  On the bottom surface side of the storage tank 110, a drug solution line L1 is connected, and a delivery port 120 is provided that forms a delivery hole 120h for sending the myocardial protective solution in the storage tank 110 to the drug solution line L1.

  4 to 6, a plurality of communication holes 132h1, 132h2, 132h3 communicating with the storage region 110a are provided inside the storage tank 110, the lower end side communicates with the delivery hole 120h, and the upper end side is the storage tank 110. A cylindrical guide hole 130h extending upward and having a closed upper end is formed, and a cylindrical wall 131 having an annular cross section is provided. The communication holes 132h1, 132h2, and 132h3 are slit-like openings that extend in the vertical direction. Note that the shape of the communication hole is not limited to the slit-like opening shape.

  In the present embodiment, the cylindrical wall 131 is disposed in contact with the first lower side wall portion 113 of the first side wall 110A, and the first lower side wall portion 113 constitutes a part of the cylindrical wall 131. ing. A region constituting a part of the cylindrical wall 131 of the first lower side wall portion 113 bulges in a substantially semicircular shape on the outer surface side (a region indicated by S in FIG. 6).

  In the storage tank 110, the valve body 140, which will be described later, moves up and down by forming a substantially semicircular bulging region with a member (for example, a transparent member or a semitransparent member) that can be visually recognized from the outside. The position can be easily confirmed from the outside.

  A valve body 140 is accommodated inside the cylindrical wall 131 so that the guide hole 130h can be moved in the vertical direction. The valve body 140 moves in the vertical direction as the liquid level of the myocardial protective liquid stored in the storage tank 110 moves up and down, and at least a part is below the liquid level of the myocardial protective liquid (see S1 in FIG. 8). In the state located at the lowest end of the guide hole 130h, the communication with the delivery hole 120h of the delivery port 120 is blocked.

  With reference to FIG. 7 and FIG. 8, the valve body 140 in this Embodiment is demonstrated. The valve body 140 has a cylindrical outer surface region 141 on the outer peripheral surface and a conical outer surface region 142 whose outer peripheral surface is narrowed downward on the lower end side of the cylindrical outer surface region 141. The valve body 140 is made of a material whose specific gravity is adjusted so that at least a part thereof is located below the liquid surface S1 of the myocardial protective liquid, and may be an integrally molded product or a combination product comprising two or more components. It may be.

  The inner peripheral surface that communicates with the delivery port 120 of the cylindrical wall 131 has a guide hole that narrows downward so that the valve body 140 is positioned at the lowermost end of the guide hole 130h so as to be in close contact with the conical outer surface region 142. An inner region 132 is included.

  In the present embodiment, the valve body 140 is molded using styrene rubber, and the dimensions are such that the length (H1) of the cylindrical outer surface region 141 is about 13 mm, and the diameter (D1) is about 8 mm. The length (H2) of the conical outer surface region 142 is about 5 mm, and the diameter (D2) of the lower end is about 3.5 mm. The material of the valve body 140 is preferably a material that has little influence on the human body, such as polycarbonate, polypropylene, styrene rubber, silicon rubber, and elastomer. More preferably, in addition to the above properties, it is preferable that the valve body 140 is made of a material having elasticity that can easily block communication with the delivery hole 120h of the delivery port 120 when the valve body 140 is in close contact with the inner surface region of the guide hole 130h. .

(Movement of valve body 140)
Next, with reference to FIG. 9 to FIG. 11, a state in which the valve element 140 moves in the vertical direction as the liquid level S1 of the myocardial protective solution A moves up and down will be described. FIGS. 9 to 11 are FIGS. 1 to 3 showing the movement state of the valve element 140 due to the change of the liquid level S1 in the medical reservoir 100 in the present embodiment.

  Referring to FIG. 9, a state in which a sufficient myocardial protective solution A is stored in the storage tank 110 of the medical reservoir 100 is shown. The liquid surface S1 of the myocardial protective liquid A is located above the upper end of the cylindrical wall 131. As a result, the valve body 140 is positioned at the uppermost end of the guide hole 130h, abuts against the lid portion 131b provided at the upper end of the cylindrical wall 131, and further floating is prevented.

  With reference to FIG. 10, the liquid level S <b> 1 of the myocardial protective liquid A inside the storage tank 110 is shown below the upper end of the guide hole 130. The valve body 140 moves downward along with the downward movement of the liquid level S1 of the myocardial protective liquid A, part of the valve body 140 is exposed on the liquid level S1, and the other part is below the liquid level S1 (liquid It is located below the surface.

  The liquid surface S1 of the myocardial protective liquid A always has the same liquid level in the guide hole 130h and in the storage area 110a because the communication holes 132h1, 132h2, and 132h3 are provided in the cylindrical wall 131. .

  Referring to FIG. 8 again, the position of the communication hole 132h3 located at the lowermost level is the same as that in the guide hole 130h and the storage region even when the valve body 140 blocks communication with the delivery hole 120h of the delivery port 120. In order to match the liquid level with 110a, it is provided in a region below the liquid level S1.

  In the storage tank 110, when the region bulging in a substantially semicircular shape of the first lower side wall 113 is formed of a member (for example, a transparent member or a semitransparent member) that can visually recognize the inside from the outside, The position of the body 140 can be confirmed from the outside. Further, the remaining amount of the myocardial protective solution A can be confirmed by providing a scale on the first lower side wall portion 113.

  Referring to FIG. 11, the state in which the liquid level S1 of the myocardial protective liquid A inside the storage tank 110 is located at the lowest end of the guide hole 130h is shown. This state is the same as the state shown in FIG. 8, and the conical outer surface region 142 of the valve body 140 is in close contact with the guide hole inner surface region 132, so that communication with the delivery hole 120 h of the delivery port 120 is blocked. .

  At this time, since the conical outer surface area 142 of the valve body 140 is positioned below the liquid surface S1 of the myocardial protective liquid A, the conical outer surface area 142 is in close contact with the guide hole inner surface area 132. The myocardial protective solution A remains in the storage area 110a. As a result, since the communication with the delivery hole 120h of the delivery port 120 is blocked before the storage region 110a becomes empty, air is not sent to the delivery port 120.

  In addition, since the medical reservoir 100 according to the present embodiment is composed only of the storage tank 110 made of a resin molded product, the lid 170, and the valve body 140, it is possible to suppress an increase in manufacturing cost.

(Embodiment 2)
A medical reservoir 200 according to the second embodiment will be described with reference to FIGS. FIG. 12 is a sectional view showing the lowest end shape of the guide hole of the medical reservoir and the structure of the valve body in the present embodiment, and FIG. 13 shows the appearance of the valve body used in the medical reservoir in the present embodiment. FIGS. 14A, 14B, and 14C are cross-sectional views showing other forms of the cross-sectional shape of the valve body used in the medical reservoir in the present embodiment.

  The difference from the medical reservoir 100 in the first embodiment is the shape of the valve body. The valve body 140 used in the medical reservoir 100 is provided with a conical outer surface region 142 that narrows downward. However, in the medical reservoir 200 according to the present embodiment, the valve body 150 whose outer surface is cylindrical is used. Other configurations are the same as those of the medical reservoir 100 in the first embodiment.

  As shown in FIG. 12, even in the valve body 150 having such a shape, the bottom surface 150b of the valve body 150 blocks the delivery hole 120h in a state where the valve body 150 is positioned at the lowermost end of the guide hole 130h. Thus, similar to the valve body 140 in the first embodiment, the communication with the delivery hole 120h of the delivery port 120 can be blocked before the storage region 110a becomes empty. Thereby, the same effect as the medical reservoir 100 of Embodiment 1 can be obtained.

  Similar to the valve body 140, the valve body 150 is made of a material whose specific gravity is adjusted so that at least a part thereof is located below the liquid surface S1 of the myocardial protective liquid, and may be an integrally molded product. As shown in FIG. 4, a combination product composed of two or more parts of the upper member 151 and the lower member 152 may be used.

  Referring to FIG. 14, the cross section of valve body 150 is not limited to the circular shape shown in (a), and a quadrilateral shape in (b), a hexagonal shape in (c), or other polygonal shapes may be adopted. it can. The cross-sectional shape of the valve body 150 may be a polygon, and the inner surface of the cylindrical wall 131 may be a polygonal inner surface shape that matches the outer surface of the valve body 150.

(Embodiment 3)
With reference to FIG. 15 and FIG. 16, the medical reservoir 300 in Embodiment 3 is demonstrated. FIG. 15 is a cross-sectional view showing the lowest end shape of the guide hole of the medical reservoir and the structure of the valve body in the present embodiment, and FIG. 16 shows the appearance of the valve body used in the medical reservoir in the present embodiment. It is a whole perspective view.

  The difference from the medical reservoir 100 in the first embodiment is the shape of the valve body. The valve body 140 used in the medical reservoir 100 is provided with a conical outer surface region 142 that narrows downward. However, in the medical reservoir 300 in the present embodiment, a spherical valve body 160 is used. Other configurations are the same as those of the medical reservoir 100 in the first embodiment.

  As shown in FIG. 15, even in the valve body 160 having such a shape, the bottom surface 160b of the valve body 160 blocks the delivery hole 120h when the valve body 160 is positioned at the lowermost end of the guide hole 130h. Thus, similar to the valve body 140 in the first embodiment, the communication with the delivery hole 120h of the delivery port 120 can be blocked before the storage region 110a becomes empty. Thereby, the same effect as the medical reservoir 100 of Embodiment 1 can be obtained.

  Like the valve body 140, the valve body 160 is made of a material whose specific gravity is adjusted so that at least a portion thereof is located below the liquid surface S1 of the myocardial protective liquid, and may be an integrally molded product. As shown in FIG. 2, a combination product composed of two or more parts of the upper member 161 and the lower member 162 may be used.

(Embodiment 4)
With reference to FIG. 17 and FIG. 18, the medical reservoir 400 in Embodiment 4 is demonstrated. FIG. 17 is a cross-sectional view showing the lowest end shape of the guide hole of the medical reservoir and the structure of the valve body in the present embodiment, and FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII in FIG.

  In the medical reservoirs 100, 200, and 300 according to the first to third embodiments, the cylindrical wall 131 is disposed in contact with the first lower side wall 113 of the first side wall 110A, and the first lower side wall 113 is provided. Constitutes a part of the cylindrical wall 131.

  In the medical reservoir 400 in the present embodiment, the cylindrical wall 131 is not in contact with the first lower side wall portion 113 and has a form independent of the first lower side wall portion 113. Other configurations are the same as those of the medical reservoir 100 in the first embodiment. Thereby, the same effect as that of the medical reservoir 100 of the first embodiment can be obtained.

  As the material used for the valve body in each of the above embodiments, when the valve body floats on the myocardial protective liquid A, the liquid surface S1 of the myocardial protective liquid A is located above the surface where the inner surface of the delivery hole 120h and the valve body are in close contact with each other. It is preferable to have a specific gravity that can hold That is, it is a material that maintains a certain length between the liquid surface S1 and the close contact surface, and can physically contact the close contact surface of the valve body and the inner surface of the delivery hole 120h before all the myocardial protective liquid A is delivered. Good.

  As the shape of the valve body, (1) a part of the valve body is in close contact with the inner surface of the myocardial protective liquid delivery hole 120h to maintain liquid tightness, and (2) the liquid surface S1 from the surface involved in the blockage of the valve body. Can be held at the top, that is, a shape having a certain length is preferable.

  The shape of the guide hole 130h containing the valve body is not limited to (1) a cylindrical shape, but can hold the orientation when the valve body moves up and down (the size and shape of the valve body so that the valve body does not turn upside down, (Size and shape that does not cause an inclination to hinder the occlusion mechanism), and (2) the storage area partially so that the liquid level of the myocardial protective liquid storage area 110a and the liquid level of the guide hole 130h can be the same. It is preferable that 110a and the guide hole 130h have a shape communicating with each other.

  In each of the above embodiments, the case where the present invention is applied to a medical reservoir that stores a myocardial protective solution has been described. However, the present invention is not limited to a medical reservoir that stores a myocardial protective solution, and blood It is also possible to apply it to a medical reservoir that stores water.

  Moreover, the form of the storage tank 110 of the medical reservoirs 100 to 400 in each of the above embodiments is merely an example, and a square shape, a rectangular shape, and a columnar shape can also be adopted.

  As mentioned above, although each embodiment based on this invention was described, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

100, 200, 300, 400 Medical reservoir, 110 storage tank, 110A first side wall, 110B second side wall, 110a storage area, 111 first upper side wall, 112 first inclined wall, 113 first lower side wall, 114 second upper side wall, 115 second inclined wall, 116 middle side wall, 118 third inclined wall, 119 bottom wall, 120 delivery port, 120h delivery hole, 130h guide hole, 131 cylindrical wall, 131b lid, 132 guide hole inner surface region, 132h1, 132h2, 132h3 communication hole, 140, 150, 160 valve body, 141 cylindrical outer surface region, 142 conical outer surface region, 150b bottom surface, 151, 161 upper member, 152, 162 lower member, 170 lid, 500 oxygenator, 600 heat exchanger, A myocardial protective solution, L1, L3 drug solution Inn, L2 blood return line, P1 infusion pump.

Claims (4)

A medical reservoir connected to the pipeline through which the drug solution or blood in the pipeline is pumped out by an infusion pump, storing the drug solution or blood, and supplying the drug solution or blood to the pipeline;
A storage tank that forms a storage region for storing the drug solution or the blood inside;
A delivery port which is provided on the bottom surface side of the storage tank and is connected to the pipeline, and which forms a delivery hole for delivering the drug solution or the blood in the storage tank to the pipeline;
A cylindrical shape provided inside the storage tank, having a cylindrical guide hole having a lower end side communicating with the delivery hole and an upper end side extending upward of the storage tank, and a communication hole communicating with the storage area. With walls,
The guide hole is accommodated in the cylindrical wall so that the guide hole can be moved in the vertical direction. The drug solution or the blood stored in the storage tank moves in the vertical direction along with the vertical movement, and at least a part of the guide hole moves. A valve body that is located below the liquid level of the drug solution or blood and located at the lowest end of the guide hole, and that blocks communication with the delivery hole of the delivery port;
A medical reservoir. The storage tank includes a first side wall and a second side wall arranged opposite to each other,
The second side wall is inclined so that the lower side is closer to the first side wall than the upper side of the storage tank,
The medical reservoir according to claim 1, wherein the cylindrical wall is disposed in contact with the first side wall, and the first side wall constitutes a part of the cylindrical wall.   The area | region which comprises a part of said cylindrical wall of the said 1st side wall is formed with the member which can visually recognize the said valve body accommodated in the said guide hole from the said storage tank. Item 3. A medical reservoir according to Item 1 or 2. The outer peripheral surface on the lower end side of the valve body includes an outer surface area that narrows downward,
An inner peripheral surface that communicates with the delivery port of the cylindrical wall includes an inner surface region that narrows downward so as to be in close contact with the outer surface region in a state where the valve body is positioned at the lowermost end of the guide hole. The medical reservoir according to any one of claims 1 to 3.

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