JP7539336B2 - Medical Stopcock - Google Patents

Description

This disclosure relates to medical stopcocks, and in particular to medical stopcocks that can be used for injecting medicinal fluids.

In some cases, medical circuits such as infusion circuits and blood circuits are connected to three-way stopcocks or other medical valves for switching flow paths. By connecting a three-way stopcock, for example, during an IV drip, it is easy to introduce another liquid medicine from a side flow path into the liquid medicine flowing through the main flow path.

A typical three-way stopcock has a first pipeline and a second pipeline arranged in a straight line, and a third pipeline arranged in a direction intersecting the first and second pipelines. The three pipelines are connected to a cylindrical main body, and a cylindrical stopper is rotatably inserted inside the main body. The stopper has a T-shaped flow hole that passes through the inside, and by rotating the stopper to adjust the position of the flow hole, the three pipelines can be opened or closed (see, for example, Patent Document 1).

However, such three-way stopcocks create dead space due to the T-shaped flow hole that penetrates the stopcock, so for example, some of the medicinal liquid injected from the third line remains in the dead space.

In order to prevent the accumulation of medicinal liquid, a three-way stopcock has been developed that has a groove on the outer periphery of the stopcock and flushes the third line with medicinal liquid from the first line (see, for example, Patent Document 2).

However, even if a groove is provided on the outer periphery of the stopper, the medicinal liquid only flows through the main body side of the third conduit, making it difficult to flush the entire third conduit. As a result, the effect of eliminating stagnation of the medicinal liquid is insufficient. This is true not only for three-way stopcocks, but also for other medical stopcocks.

Therefore, in order to prevent the accumulation of medicinal liquid, a three-way stopcock has been considered in which a partition is provided in the third line so that the medicinal liquid or blood flowing from the first line will pass over the partition and flow into the second line (see, for example, Patent Document 3).

JP 2005-046349 A JP 2008-511371 A JP 2010-142438 A

However, in conventional three-way stopcocks, the medicinal liquid or the like flowing from the first pipeline to the second pipeline cannot flow from the first pipeline to the second pipeline unless it overcomes the partition. This causes the flow of the medicinal liquid to be temporarily blocked by the partition, reducing the flow rate into the second pipeline, resulting in a problem that the medicinal liquid cannot be administered sufficiently into the patient's body through a catheter or the like connected to the end of the second pipeline.

The objective of this disclosure is to realize a medical stopcock that is less likely to cause retention of medicinal liquid in the pipeline and is less likely to reduce the flow rate of medicinal liquid or the like flowing into the second pipeline.

One aspect of the medical stopcock comprises a cylindrical body, a first conduit, a second conduit, and a third conduit, each connected to the side of the body at intervals in the circumferential direction, and a columnar stopper whose outer circumferential surface is supported by the inner circumferential surface of the body and can rotate relatively to the body. The third conduit has a partition wall that divides the third conduit, and the stopper has a groove portion provided on its outer circumferential surface. The first conduit and the second conduit are connected by a first flow path that is constituted by the groove portion and the inner wall surface of the body when the stopper is in the first position, a second flow path that is constituted by the groove portion and the inner wall surface of the body and connects the second conduit and the third conduit, a third flow path that is constituted by the outer circumferential surface of the partition wall and the inner wall surface of the third conduit and connects the first flow path and the second flow path, and a fourth flow path that is constituted by the groove portion and the end surface of the partition wall on the body side and connects the first flow path and the second flow path.

By configuring in this way, when the plug is in the first position, the first and second pipelines are connected not only by the third flow path but also by the fourth flow path, so that a decrease in the flow rate from the first pipeline to the second pipeline can be prevented. In addition, it is possible to sufficiently flush the third pipeline with the liquid flowing through the third flow path.

In one aspect of the medical stopcock, when the stopper is in the first position, the extension line of the portion of the groove that becomes the first flow path may reach the side of the partition wall on the first line side, and the extension line of the portion of the groove that becomes the second flow path may reach the side of the partition wall on the second line side. Also, when the stopper is in the first position, the portion of the groove that becomes the first flow path may extend in a direction that intersects with the partition wall. This makes it even more difficult for the medicinal liquid to remain between the first flow path and the second flow path.

In one aspect of the medical stopcock, the third flow path has a first portion on the first pipeline side and a second portion on the second pipeline side, and when the stopcock is in the first position, the end of the groove portion that becomes the first flow path on the third pipeline side may be located within a range that extends into the main body from the first portion of the third flow path. This configuration allows liquid to flow sufficiently from the first flow path to the third flow path.

In one embodiment of the medical stopcock, the third conduit may have a tapered section whose inner diameter gradually decreases toward the main body. By providing a tapered section, no steps are created in the third conduit, making it more difficult for the medicinal liquid to stagnate.

In one embodiment of the medical stopcock, the width of the groove may be greater than or equal to the width of the end of the third conduit on the main body side. This configuration allows the third conduit to be sufficiently flushed. In this case, the width of the groove may be greater than or equal to 1.5 mm and less than or equal to 4.0 mm.

In one aspect of the medical stopcock, the third conduit can have a male connector inserted into it from the end opposite the main body, and the tip of the inserted male connector can abut against the end face of the partition wall. This allows the partition wall to act as a stopper that limits the insertion depth of the male connector, making it easier to connect the male connector and less likely for the valve body to fall off.

In one embodiment of the medical stopcock, the first conduit may have a narrower diameter toward the main body. This configuration can reduce retention of liquid in the first conduit.

In one embodiment of the medical stopcock, in the first position, the outer end of the first flow path may be located lower than the lower surface of the end of the first pipeline. This configuration can prevent liquid from accumulating in the first pipeline even if misalignment occurs.

The medical stopcock disclosed herein can prevent the retention of medicinal fluid within the pipeline.

FIG. 1 is a perspective view showing a medical stopcock according to one embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a cross-sectional view showing the plug in a first position. FIG. 4 is a cross-sectional view showing the plug in a second position. FIG. 4 is an enlarged cross-sectional view showing a portion of a first flow path. FIG. 11 is a cross-sectional view showing a modified example of the plug. FIG. 11 is a cross-sectional view showing a modified example of a medical stopcock.

As shown in Figures 1 to 3, the medical stopcock of this embodiment is a three-way stopcock that has a cylindrical main body 101, a first pipeline 111, a second pipeline 112, and a third pipeline 113 that are connected to the side of the main body 101 at intervals in the circumferential direction, and a cylindrical stopper body 102 whose outer surface is supported by the inner surface of the main body 101 and which can rotate relatively to the main body 101.

In the three-way stopcock of this embodiment, the first conduit 111 and the second conduit 112 are arranged in a straight line on either side of the main body 101, and the third conduit 113 is arranged in a direction perpendicular to the first conduit 111 and the second conduit 112. In FIG. 1, the first conduit 111 is a female luer connector, the second conduit 112 is a male luer connector with a coupler, and the third conduit 113 is a needleless connector having a valve body 134. The three-way stopcock of this embodiment can be used in any orientation, but the following description will be given assuming that the third conduit 113 is arranged facing upward. In addition, the side connected to the main body 101 will be described as the base end and the opposite side as the end.

A partition wall 133 is provided at the base end of the third conduit 113, dividing the third conduit 113 into two parts along the axial direction of the cylindrical body 101. The plug 102 has a groove 121 provided on its outer circumferential surface. The plug 102 is integral with the handle 105 and can be rotated together with the handle 105.

As shown in FIG. 4, when the plug 102 is rotated relative to the main body 101 to the first position, the groove 121 and the inner wall of the main body 101 form a first passage 123 connecting the first pipeline 111 and the third pipeline 113, and a second flow path 124 connecting the second pipeline 112 and the third pipeline 113. In addition, the outer peripheral surface of the partition 133 and the inner wall surface of the third pipeline 113 form a third flow path 127 connecting the first flow path 123 and the second flow path 124, and the groove 121 and the end of the partition 133 on the main body 101 side form a fourth flow path 128 connecting the first flow path 123 and the second flow path 124.

Therefore, the first flow path 123 and the second flow path 124 are connected by a third flow path 127 that passes through the third pipeline 113, and are also connected by a fourth flow path 127 that passes through the main body 101. Furthermore, the third flow path 127 is divided by a partition wall 133 into a first portion 131 on the first pipeline 111 side and a second portion 132 on the second pipeline 112 side. The chemical solution or the like that flows through the third flow path 127 passes through the first portion 131 and the second portion 132.

As shown in FIG. 5, by rotating the plug 102 about 180 degrees from the first position to the second position, the first pipeline 111 and the second pipeline 112 are connected by the fifth flow path 129 formed by the groove 121 and the inner wall surface of the main body 101, but the third pipeline 113 is not connected and the third flow path 127 is closed. By rotating the plug 102 about 90 degrees clockwise from the first position to the third position, the first pipeline 111 and the third pipeline 113 can be connected, and by rotating the plug 102 about 90 degrees counterclockwise to the fourth position, the second pipeline 112 and the third pipeline 113 can be connected.

When the stopper body 102 is in the first position and a medicinal liquid or the like is flowed from the first pipeline 111 to the second pipeline 112, if the fourth flow path 128 is blocked and only the third flow path 127 provided in the third pipeline 113 is open, the resistance of the flow path increases and the flow rate to the second pipeline 112 decreases. However, in the three-way stopcock of this embodiment, the first pipeline 111 and the second pipeline 112 are connected not only by the third flow path 127 but also by the fourth flow path 128, so that the flow rate from the first pipeline 111 to the second pipeline 112 is secured and a decrease in the flow rate is less likely to occur. The medicinal liquid that flows from the first flow path 123 to the third flow path 127 flows to the distal end side through the first portion 131 side, overcomes the partition wall 133 at the distal end side of the third pipeline 113, and flows to the second flow path 124 through the second portion 132. Therefore, compared to when the partition wall 133 is not present, the entire third pipeline 113 can be flushed. Therefore, when another liquid medicine is injected from the third pipeline 113, the liquid medicine injected from the third pipeline 113 can be prevented from remaining in the third pipeline 113.

As shown in FIG. 3, the width along the axial direction at the base end of the third conduit 113 is the same as the width of the groove portion 121, which is the first flow path 123 and the second flow path 124. Therefore, the first medicinal liquid that flows through the first flow path 123 from the first conduit 111 side is smoothly guided not only to the fourth flow path 128 side, but also into the first part 131 of the third flow path 127. It also flows from the second part 132 to the second flow path 124. This makes it less likely that the medicinal liquid will stagnate in the third conduit 113. Note that the three-way stopcock is used for infusion, anesthesia, enteral nutrition, etc., and in order to ensure an appropriate flow rate for each application, the width of the groove portion 121 is preferably 1.5 mm to 4.0 mm, and the width of the end on the main body side is preferably 1.5 mm to 4.0 mm.

The above dimensions are not particularly limited and can be changed as needed depending on the application.

The third conduit 113 can be provided with a tapered section 135 whose inner diameter gradually decreases from the distal end to the proximal end. By providing the tapered section 135, the proximal end side, which is narrowed to match the width of the groove 121, which is the first flow path 123 and the second flow path 124, can be connected without any steps to the distal end side, which has an inner diameter that allows a syringe or the like to be inserted. This ensures a sufficient amount of liquid flowing through the third flow path 127, making it less likely that the drug solution will stagnate.

When inserting a male luer connector into the third conduit 113, the bulkhead 133 can be used as a stopper that limits the insertion depth of the male luer connector. In this case, the male luer connector can be designed so that when inserted to an appropriate position, the tip of the male luer connector abuts against the distal end face of the bulkhead 133. For example, in the case of a standard male luer connector with a coupler, it is preferable to allow it to be inserted approximately 4.0 mm to 8.0 mm.

It is also preferable that the distal end of the partition 133 has a curved shape, such as a hemisphere. This configuration makes it easier to prevent retention in the third pipeline 113 compared to when the distal end is angular.

In this embodiment, when the plug 102 is in the first position, as shown in FIG. 4, it is preferable that the apex portion constituting the fourth flow path 128 of the groove portion 121 is flat. With this configuration, when the plug 102 is rotated 180 degrees from the first position to the second position as shown in FIG. 5, a bottleneck is less likely to occur in the fifth flow path 129 compared to a case in which a large protrusion occurs in the middle of the fifth flow path 129, and a sufficient flow rate from the first pipeline 111 to the second pipeline 112 can be ensured. Note that the apex portion may not be completely flat but may have a slight bulge. For example, it may be a curved surface that is approximately parallel to the inner circumference of the main body 101. At least the connection portion between the slope of the first flow path 123 and the apex portion and the connection portion between the slope of the second flow path 124 and the apex portion are preferably curved surfaces extending toward the third flow path 127. This configuration promotes flow into the third flow path, ensuring a sufficient flow rate from the first pipeline 111 to the second pipeline 112.

Furthermore, as shown in FIG. 4, in the first position, the upper end of the first flow path 123 is preferably provided above the upper end of the base end of the first pipeline 111. This configuration promotes flow to the first portion 131, thereby making it less likely for stagnation to occur.

The three-way stopcock is used for infusion, anesthesia, enteral nutrition, etc., and the inner diameter Φ of the main body 101 can be set to 4.5 mm to 10.5 mm to ensure an appropriate flow rate for each application. When the stopper 102 is in the first position, in order to ensure a sufficient amount of medicinal liquid passing through the third conduit 113, it is preferable that the minimum distance d1 between the bottom surface of the groove 121 in the fourth flow path 128 and the end surface of the partition wall 133 on the main body 101 side is set to about 0.8 mm to 2.8 mm. By setting d1 to such a value, a sufficient flow rate can be ensured between the first conduit 111 and the second conduit 112 when the stopper 102 is in the second position. In addition, the maximum height difference h of the groove 121 can be set to about 2.0 mm to 5.0 mm.

In order to ensure the flow rate of the first flow path 123 and the second flow path 124 when the plug 102 is in the first position, it is preferable that the minimum distances d2 and d3 between the bottom surface of the groove 121 in the first flow path 123 and the inner wall surface of the main body 101 are approximately 1.0 mm to 2.5 mm. By setting d2 and d3 to such values, it is possible to ensure a sufficient flow rate between the first pipeline 111 and the second pipeline 112 when the plug 120 is in the second position.

The above dimensions are not particularly limited and can be changed as needed depending on the application.

4, when the stopper 102 is in the first position, the extension line of the portion constituting the first flow path 123 in the groove 121 reaches the lowest end of the side surface of the partition wall 133 on the first pipeline 111 side, and the extension line of the portion constituting the second flow path 124 reaches the lowest end of the side surface of the partition wall 133 on the second pipeline 112 side. If the fourth flow path 128 is made large so that a sufficient flow rate can be ensured when the stopper 102 is in the second position, when the stopper 102 is in the first position, most of the drug solution flowing from the first pipeline 111 to the second pipeline 112 passes through the fourth flow path 128 below the partition wall 133, and there is a risk that the third pipeline 113 cannot be flushed. However, the three-way stopper of this embodiment is designed so that the extension line of the slope that is the first flow path 123 in the groove 121 and the extension line of the slope that is the second flow path 124 reach the lowest end of the side surface of the partition wall 133. Therefore, the flow of the drug solution from the first pipeline 111 toward the third pipeline 113 through the first flow path 123 hits the side of the partition 133 and is likely to enter the first portion 131 of the third flow path 127 along the partition 133. Also, the flow of the drug solution from the second portion 132 hits the second flow path 124 and is likely to flow toward the second pipeline 112. Therefore, a sufficient amount of drug solution can be ensured to pass through the third pipeline 113.

As shown in FIG. 6, when the plug 102 is in the first position, the end (upper end) 123a of the part constituting the first flow path 123 in the groove 121 on the third pipeline side 113 side can be positioned in a range in which the first part 131 of the third flow path 127 is extended into the main body 101. By positioning the upper end 123a of the first flow path 123 within the range in which the first part 131 is extended, a sufficient flow rate can be ensured from the first flow path 123 to the third flow path 127. Similarly, when the plug 102 is in the first position, the end (upper end) 124a of the part constituting the second flow path 124 in the groove 121 on the third pipeline side 113 side can be positioned in a range in which the second part 132 of the third flow path 127 is extended into the main body 101.

Also, as shown in FIG. 7, when the plug 102 is in the first position, the portion of the groove 121 that becomes the first flow path 123 and the second flow path 124 may be curved toward the partition wall 133. In this case, when the plug 102 is in the first position, the upper end 123a of the portion that constitutes the first flow path 123 in the groove 121 can be positioned in a range that extends the first portion 131 of the third flow path 127 into the main body 101. With this configuration, when the plug 102 is in the first position, it becomes easier to ensure a sufficient flow rate of the first flow path 123, and it becomes easier to ensure the flow rate flowing from the first flow path 123 to the third flow path 127 and the flow rate flowing from the first flow path 123 to the fourth flow path 128. Also, when the plug 102 is in the second position, it becomes easier to ensure the flow rate from the first pipeline 111 to the second pipeline 112.

As shown in Figures 6 and 7, it is preferable that there is only one portion where the sign of the curvature changes from positive to negative or from negative to positive near the top of the slope of the first flow path 121. By limiting the portion where the curvature changes to one portion, no step is created in the first flow path 121, making it difficult for retention due to the step to occur.

In the three-way stopcock of this embodiment, the extension lines of the first flow path 123 and the second flow path 124 reach the lowest end of the side of the partition wall 133, but it is sufficient that the extension lines of the part of the groove portion 121 that is the first flow path 123 and the extension lines of the part of the groove portion 121 that is the second flow path 124 intersect with the partition wall 133, and they can also reach above the lowest end of the side of the partition wall 133. Even in this case, the drug solution can be guided to the third pipe 113 compared to when the extension lines of the first flow path 123 and the second flow path 124 reach the base end surface of the partition wall 133. However, when the extension lines of the first flow path 123 and the second flow path 124 reach the lowest end of the side of the partition wall 133, it is easier to ensure the depth of the groove portion 121 that serves as the flow path, and it is easier to ensure the flow rate.

As shown in FIG. 4, when the stopper body 102 is in the first position, it is preferable that the outer end of the first flow path 123 is located slightly below the lower end (end lower surface) at the base end of the first pipeline 111, and the outer end of the second flow path 124 is located slightly below the end lower surface of the second pipeline 112. When the operator operates the stopper body 102, it is difficult to align the position so that there is no misalignment, and a misalignment of more than 0° and less than ±6° usually occurs. When the stopper body 102 is completely aligned to the first position, if the ends of the first flow path 123 and the first pipeline 111 and the ends of the second flow path 124 and the second pipeline 112 are completely aligned, even a slight misalignment in alignment may cause a step that blocks the base end of the first pipeline 111. If a step that blocks the base end of the first pipeline 111 occurs, the flow rate is restricted and causes stagnation. On the other hand, if the outer end of the first flow path 123 is positioned slightly below the underside of the end of the first pipeline 111 when the plug 102 is perfectly aligned to the first position, it is possible to prevent a step from being created that blocks the end of the first pipeline 111 even if the alignment is misaligned. The same applies to the relationship between the second flow path 124 and the second pipeline 112.

As shown in FIG. 5, when the stopper 102 is in the second position, it is preferable that the outer end of the fifth flow path 129 on the second pipeline 112 side is located slightly above the upper end (top surface of the end) at the base end of the second pipeline 112, and the outer end of the fifth flow path 129 on the first pipeline 111 side is located slightly above the front end at the base end of the first pipeline 111. By arranging in this manner, even if the stopper 102 is slightly shifted from the second position, a step that blocks the end of the first pipeline 111 is unlikely to occur, and the drug solution can flow smoothly between the first pipeline 111 and the second pipeline 112 via the fifth flow path 129.

In this embodiment, the valve body 134 provided in the third pipeline 113 can be a slit valve having a slit. By using a slit valve, a male luer connector such as a luer syringe can be inserted into the third pipeline 113 to easily inject a medicinal solution. In addition, the end of the third pipeline 113 can be closed again by removing the male luer connector.

In this embodiment, an example is shown in which the valve body 134 that closes the end of the third conduit 113 is sandwiched between the outer housing 137 and the inner housing 136, but the method of fixing the valve body 134 is not limited to this and can be any other method. In addition, although the outer housing 137 is configured to have a screw thread 138 for engaging the coupler, a configuration without the screw thread 138 is also possible. The third conduit 113 can be a connector other than a needleless connector as long as it can inject a medicinal solution or the like and close the end. For example, a valve body without a slit can be provided and a medicinal solution can be injected using a syringe. Also, as shown in FIG. 8, it can be a simple female connector to which a Luer syringe or the like can be connected.

In this embodiment, an example is shown in which the first conduit 111 is a female luer connector and the second conduit 112 is a male luer connector, but the first conduit 111 and the second conduit 112 may be any connector. For example, the female luer connector and the male luer connector may be swapped, or both may be male luer connectors or female luer connectors. Also, instead of a connector, they may be directly connected to a pipe or the like. In this embodiment, the upstream conduit may be gradually narrowed in diameter toward the main body. With this configuration, it is possible to make it difficult for liquid to stagnate in the upstream conduit.

In this embodiment, the medical stopcock is a three-way stopcock, but it is not limited to a three-way stopcock. Any medical stopcock that has a branch for injecting a medicinal solution can be configured in a similar manner. For example, it can be configured with a fourth line on the opposite side of the third line.

The medical stopcock of this embodiment is less likely to cause retention of medicinal fluid within the piping, and is useful as a medical stopcock for connecting to a medical circuit such as an infusion circuit.

101 Body 102 Plug 105 Handle 111 First conduit 112 Second conduit 113 Third conduit 121 Groove 123 First flow path 124 Second flow path 127 Third flow path 128 Fourth flow path 129 Fifth flow path 131 First portion 132 Second portion 133 Partition 134 Valve body 135 Reduced diameter portion 136 Inner housing 137 Outer housing 138 Thread

Claims (5)

A cylindrical body;
a first pipeline, a second pipeline, and a third pipeline respectively connected to a side surface of the main body at intervals in a circumferential direction;
a plug body having an outer circumferential surface supported by an inner circumferential surface of the main body, the plug body being columnar and extending in an axial direction of the main body and being rotatable relative to the main body;
the third pipeline has a first portion on the first pipeline side and a second portion on the second pipeline side, the first portion and the second portion being separated from each other by a partition wall extending in an axial direction of the main body and in an extending direction of the third pipeline,
When the plug is in a first position, a first flow path, a second flow path, a third flow path and a fourth flow path are formed,
the first flow path is formed in the plug and connects the first pipeline and the first portion of the third pipeline;
the second flow path is formed in the plug and connects the second pipeline and the second portion of the third pipeline;
The third flow path is formed in the third pipeline,
The fourth flow passage is formed in the plug and connects the first flow passage and the second flow passage,
When the plug is in a first position, at least a part of a surface of the plug located on an extension line of the first pipeline is not perpendicular to the extension line of the first pipeline and is an inclined surface toward the third pipeline side, at least a part of a surface of the plug located on an extension line of the second pipeline is not perpendicular to the extension line of the second pipeline and is an inclined surface toward the third pipeline side, and a step is formed at a boundary between the first pipeline and the first flow path, where a lower surface on the first flow path side is lower than a lower surface on the first pipeline side, and a step is formed at a boundary between the second pipeline and the second flow path, where a lower surface on the second flow path side is lower than a lower surface on the second pipeline side,
the third conduit has a cylindrical portion connected to a side surface of the main body, and a housing fixed to an end of the cylindrical portion and holding a valve body;
the partition wall is located inside the cylindrical portion of the third pipeline and the housing,
The cylindrical portion of the third conduit has a third conduit enlarged diameter portion at a distal end side, the third conduit having an inner diameter larger than that at a proximal end side,
the third pipe enlarged diameter portion has an inner diameter that gradually increases toward the housing until the inner diameter of the housing coincides with the inner diameter of the housing;
A medical stopcock , wherein an end of the partition wall on the valve body side is semicircular in a cross section perpendicular to the axial direction of the main body. A cylindrical body;
a first pipeline, a second pipeline, and a third pipeline respectively connected to a side surface of the main body at intervals in a circumferential direction;
a plug body having an outer circumferential surface supported by an inner circumferential surface of the main body, the plug body being columnar and extending in an axial direction of the main body and being rotatable relative to the main body;
the third pipeline has a first portion on the first pipeline side and a second portion on the second pipeline side, the first portion and the second portion being separated from each other by a partition wall extending in an axial direction of the main body and in a direction in which the third pipeline extends,
When the plug is in a first position, a first flow path, a second flow path, a third flow path and a fourth flow path are formed,
the first flow passage is formed in the plug and connects the first pipeline and the first portion of the third pipeline;
the second flow path is formed in the plug and connects the second pipeline and the second portion of the third pipeline;
The third flow path is formed in the third pipeline,
the fourth flow passage is formed in the plug and connects the first flow passage and the second flow passage;
When the plug is in a first position, at least a part of a surface of the plug located on an extension of the first portion of the third conduit becomes an inclined surface that slopes radially outward of the plug from the third conduit toward the first conduit, and at least a part of a surface of the plug located on an extension of the second portion of the third conduit becomes an inclined surface that slopes radially outward of the plug from the third conduit toward the second conduit, and a step is formed at a boundary between the first conduit and the first flow path, where a lower surface on the first flow path side is lower than a lower surface on the first conduit side, and a step is formed at a boundary between the second conduit and the second flow path, where a lower surface on the second flow path side is lower than a lower surface on the second conduit side,
the third conduit has a cylindrical portion connected to a side surface of the main body, and a housing fixed to an end of the cylindrical portion and holding a valve body;
the partition wall is located inside the cylindrical portion of the third pipeline and the housing,
The cylindrical portion of the third conduit has a third conduit enlarged diameter portion at a distal end side, the third conduit having an inner diameter larger than that at a proximal end side,
the third pipe enlarged diameter portion has an inner diameter that gradually increases toward the housing until the inner diameter of the housing coincides with the inner diameter of the housing;
A medical stopcock , wherein an end of the partition wall on the valve body side is semicircular in a cross section perpendicular to the axial direction of the main body. The medical stopcock according to claim 1 or 2, wherein, when the stopcock is in the first position, an extension of the inclined surface of the stopcock that is located on an extension of the first pipeline reaches the side of the partition wall on the side of the first pipeline, and an extension of the inclined surface of the stopcock that is located on an extension of the second pipeline reaches the side of the partition wall on the side of the second pipeline. The medical stopcock according to any one of claims 1 to 3 , wherein a connection portion between a surface of the stopcock that becomes the first flow path and a surface of the stopcock that becomes the fourth flow path is a curved surface. 5. The medical stopcock according to claim 1, wherein, when the stopcock is in a first position, a portion of the inner surface of the body that forms the first flow path and the second flow path is convex outward, and a portion of the outer surface of the stopcock that forms the first flow path and the second flow path is convex inward.

Images