JP6417705B2 - Hub with valve - Google Patents

Description

  The present disclosure relates to a valved hub, and more particularly to a valved hub connected to a medical device such as a catheter.

  In general, a backflow prevention valve for preventing blood leakage is connected to the proximal end side of a catheter inserted in a blood vessel. On the other hand, there are cases where it is desired to collect a blood sample from within a blood vessel using a catheter. Therefore, there is a demand for a valve having a low pressure threshold when flowing from the outside of the body to the inside of the body and a high pressure threshold when flowing from the inside of the body to the outside of the body.

  In order to realize a valve having such a configuration, a valve in which a flexible valve body having a slit is arranged between a flow path having a large diameter and a flow path having a small diameter has been studied (for example, patents). See reference 1.) Since the valve body can be easily expanded to the flow path side with a large space and a large diameter, the fluid can be flowed from the flow path side with a small diameter to the large flow path side even when the pressure difference is small. On the other hand, since the valve body is difficult to expand on the channel side with a small diameter, fluid does not flow unless there is a large pressure difference from the channel side with a large diameter to the channel side with a small diameter. Therefore, by reducing the diameter of the flow path outside the body and increasing the diameter of the flow path inside the body, the pressure threshold is low and the medicine can be easily supplied from the outside of the body to the inside of the body. The pressure threshold is high outside the body, and blood or the like can flow only when suction or the like is performed by a syringe.

JP-A-4-246370

  However, the conventional valve has a problem that the difference between the threshold value of the pressure required when flowing into the body and the threshold value of pressure required when flowing out of the body is small. For this reason, there are problems that it is not possible to easily supply a medicine or the like from the outside of the body, or that leakage of blood from the inside of the body cannot be sufficiently stopped.

  Increasing the difference in threshold value depending on the shape of the valve body has also been studied, but it is difficult to precisely mold the valve body, and there is a problem that the variation becomes large and the cost increases.

  An object of the present disclosure is to solve the above-described problems and to realize a hub with a valve that has a large difference in threshold value of pressure required during inflow and outflow even when a flat valve body is used. To do.

  One aspect of the valve-equipped hub includes a first housing having a first end surface, a first flow path opening in the first end surface, a second end surface, and an opening in the second end surface. A second housing having a second flow path larger than the diameter at the first end face of the first flow path, the second housing engaging the first housing with the second end face opposed to the first end face, A flat valve body having a slit disposed between the two end faces, at least one of the first end face and the second end face has an end face protrusion protruding from the end face, It is pressed by the end surface convex portion.

  In one aspect of the hub with valve, a flat valve body pressed by the end surface convex portion may swell in the second flow path direction.

  In one aspect of the hub with a valve, the end surface convex portion may be an annular shape that is provided on the second end surface and continuously surrounds the second flow path.

  In one aspect of the hub with valve, the end surface convex portion may be provided only on the second end surface.

  According to the hub with a valve of the present disclosure, even when a flat valve body is used, a difference in threshold value of pressure required at the time of inflow and at the time of outflow can be increased.

It is a perspective view showing a hub with a valve concerning one embodiment. It is sectional drawing in the II-II line of FIG. It is sectional drawing which shows a 1st housing. It is sectional drawing which shows a 2nd housing. (A) And (b) is a top view which shows a valve body. (A) And (b) is a top view which shows a 2nd housing. It is sectional drawing which shows the modification of a hub with a valve.

  As shown in FIGS. 1 to 4, the valve-equipped hub 100 according to an embodiment includes a first housing 111, a second housing 121, and a flat valve body 131 having a slit 132. The first housing 111 has a first end surface 112 and a first flow path 113 that passes through the first housing 111 and opens to the first end surface 112. The second housing 121 has a second end surface 122 and a second flow path 123 that passes through the second housing 121 and opens to the second end surface 122.

  The first flow path 113 has a tapered shape that gradually decreases in diameter from the first end face 112 side toward the opposite side. The second flow path 123 has a tapered shape in which the diameter gradually decreases from the second end face 122 side toward the opposite side. The diameter of the first end face 112 of the first flow path 113 is smaller than the diameter of the second end face 122 of the second flow path 123.

  The first housing 111 and the second housing 121 are engaged with the first end surface 112 and the second end surface 122 facing each other with the valve body 131 interposed therebetween. A second end surface convex portion 124 protruding from the second end surface 122 is provided on the second end surface 122 of the second housing 121. The second end surface convex portion 124 is provided in an annular shape surrounding the second flow path 123. The valve body 131 is disposed between the first end surface 112 and the second end surface 122 and is pressed by the second end surface convex portion 124. Although not shown, an end surface convex portion such as the second end surface convex portion 124 may be provided on the first end surface 112. Moreover, you may provide an end surface convex part in each of the 1st end surface 112 and the 2nd end surface 122 so that it may mention later.

  A connection port 115 is provided on the opposite side of the first flow path 113 from the first end surface 112. The connection port 115 can be a female luer, for example. The connection port 115 may be a male luer or the like. The connection port 125 may be configured to directly connect a tube or the like without using a luer or the like. A connection port 125 is provided on the opposite side of the second flow path 123 from the second end surface 122. A catheter or the like can be connected to the connection port 125. The catheter or the like may be connected to the connection port 125 by adhesion or the like, or may be detachably connected. When the catheter or the like is detachable, the connection port 125 can be a male luer or a female luer.

  The first housing 111 and the second housing 121 can be formed of a general resin material. For example, it can be polyvinyl chloride, polycarbonate or polybutylene terephthalate. The first housing 111 and the second housing 121 may be formed of the same material or different materials. The first housing 111 and the second housing 121 are engaged with each other by bonding with an adhesive, bonding with heat, mechanical fitting, or the like.

  In FIG. 2, the first engagement surface 116 is provided on the first end surface 112 of the first housing 111, and the second end surface 122 of the second housing 121 is engaged with the first engagement portion 116. Two engaging portions 126 are provided. Although FIG. 2 shows an example in which the first engagement portion 116 is a concave portion and the second engagement portion 126 is a convex portion, the concave portion and the convex portion may be interchanged. Further, the first engaging portion 116 and the second engaging portion 126 may be a male screw and a female screw instead of the fitting type. If sufficient strength can be ensured, the first housing 111 and the second housing 121 may be engaged without providing the first engaging portion 116 and the second engaging portion 126. Although FIG. 1 shows an example in which a convex portion for gripping is provided on the outer surface of the first housing 111, the convex portion may not be provided.

  Since the valve body 131 is provided with the slit 132, when the pressure on the first flow path 113 side is higher than that on the second flow path 123 side, the first flow path 113 side is sent to the second flow path 123 side. Can be liquid. Further, when the pressure on the second flow path 123 side is higher than that on the first flow path 113 side, liquid can be fed from the second flow path 123 side to the first flow path 113 side.

  In the present embodiment, the diameter of the second channel 123 at the second end surface 122 is larger than the diameter of the first channel 113 at the first end surface 112. For this reason, the outer side of the valve element 131 is supported on the second flow path 123 side than on the first flow path 113 side. Therefore, even the flat valve body 131 has a shape that slightly swells toward the second flow path 123, and the valve body 131 is easier to open toward the second flow path 123 than the first flow path 113.

  Furthermore, since the second end surface convex portion 124 surrounding the second channel 123 is provided, a relatively narrow portion of the valve element 131 is pressed and supported by the second end surface convex portion 124 on the second channel 123 side. It has been. On the second flow path 123 side, a force is applied to a relatively narrow range of the outer edge portion of the valve body 131, so that the deflection of the valve body 131 is increased and the second flow path 123 side is swollen. Further, by supporting the valve body 131 with the second end surface convex portion 124, it is less likely to become a resistance when the valve body 131 spreads toward the second flow path 123 side than in the case where the valve body 131 is supported by the entire second end surface 122. As a result, the valve body 131 is easier to open on the second flow path 123 side and is difficult to open to the first flow path 113 side. For this reason, the threshold value of the pressure when opening the valve element 131 from the first channel 113 side to the second channel 123 side, and the threshold value of the pressure when opening the valve body 131 from the second channel 123 side to the first channel 113 side, The difference can be increased. In addition, the holding force of the valve body 131 can be improved by providing the second end surface convex portion 124 on the second end surface 122.

  Compared with the case where the valve body formed in a shape swelled on the second flow path 123 side is used, the use of the second end surface convex portion 124 and the flat valve body 131 facilitates the formation of the valve body 131 and the cost. Can be greatly reduced. Further, the flat valve body 131 can be formed with high accuracy, and changes in characteristics due to individual differences of the valve bodies 131 are unlikely to occur.

  The 2nd end surface convex part 124 can be formed in the cyclic | annular form which continuously surrounds the 2nd flow path 123 as shown to Fig.6 (a). By doing in this way, it becomes difficult to produce a clearance gap between the valve body 131 and the 2nd housing 121, and it becomes difficult to produce a leak. As long as the second end surface convex portion 124 continuously surrounds the second flow path 123, the shape of the second end surface convex portion 124 viewed from the second end surface 122 side may not be a circular shape. The end surface convex portion 124 may have a polygonal shape or an elliptical shape. Further, as long as the first end surface 112 and the second end surface 122 can be sufficiently sealed, the second end surface convex portion 124 may not surround the second flow path 123 continuously. For example, a plurality of independent protrusions may be used as shown in FIG. When the second end surface convex portion 124 is a protrusion, the position of the second end surface convex portion 124 and the position of the end portion of the slit 132 are set so that the position of the second end surface convex portion 124 is on the extension line of the slit 132. May be made to correspond.

  Although the height from the 2nd end surface 122 of the 2nd end surface convex part 124 is not specifically limited, About half the thickness of the valve body 131 can be used.

  The cross-sectional shape along the axial direction of the second end surface convex portion 124 can be a shape whose width gradually decreases from the second end surface 122 side. Specifically, it can be a substantially semicircular shape, a triangular shape, a trapezoidal shape, or the like. By setting it as such a cross-sectional shape, the valve body 131 can be made more flexible. Further, a large pressure can be applied to the valve body 131. However, the side surface of the second end surface convex portion 124 may be perpendicular to the second end surface 122. The upper surface of the second end surface convex portion 124 can be a curved surface. However, when the upper surface is a flat surface, an effect of reducing leakage from the contact portion between the valve body 131 and the second end surface convex portion 124 is obtained. It is done. Even when the upper surface of the second end surface convex portion 124 is a flat surface, a force is applied to one point of the valve body 131 by forming a chamfered shape so that a corner portion does not occur at the connection portion between the upper surface and the side surface. It is possible to avoid the valve body 131 from tearing.

  In order to bulge the valve body 131 to the second flow path 123 side, a first end surface convex portion 114 may be provided on the first end surface 112 as shown in FIG. If the first end surface convex portion 114 is provided on the inner side as much as possible, the deflection of the valve body 131 can be increased. However, if the first end surface convex portion 114 is on the inner side of the second end surface convex portion 124, the first end surface convex portion 114 It can be installed anywhere. Although the height from the 1st end surface 112 of the 1st end surface convex part 114 is not specifically limited, About half of the thickness of the valve body 131 can be used. The 1st end surface convex part 114 can surround the 1st flow path 113 continuously. Moreover, it can also be set as several independent protrusion. On the other hand, from the viewpoint of smoothing the flow so as not to obstruct the opening and closing of the valve body 131 during outflow, it is possible to provide only the second end surface convex portion 124 without providing the first end surface convex portion 114. it can. However, it is possible to provide only the first end surface convex portion 114 without providing the second end surface convex portion 124.

  An example in which the valved hub is connected to the proximal end side of the catheter has been described. However, it is possible to connect between any liquid supply paths. For example, it can be connected to the proximal end of a tube connected to a winged needle. In addition, it can be connected to the end of the extension tube.

  The first flow path and the second flow path of the hub with valve are preferably shaped without corners, and the cross-sectional shape intersecting with the axial direction can be circular, but it may not be a perfect circle. The outer diameter of the valve-equipped hub is not limited to a cylindrical shape, and may have a corner shape. For example, it can be made into the shape which has cross sections, such as square shape or hexagon shape.

  The valved hub of the present disclosure has a large difference in pressure threshold required at the time of inflow and outflow, and is useful as a hub with a valve for medical use.

100 Hub 111 with a valve 1st housing 112 1st end surface 113 1st flow path 114 1st end surface convex part 115 Connection port 116 1st engaging part 121 2nd housing 122 2nd end surface 123 2nd flow path 124 2nd end surface convex Part 125 connection port 126 second engagement part 131 valve element 132 slit

Claims (6)

A first housing having a first end surface and a first flow path opening in the first end surface;
A second end face, and a second flow path that opens to the second end face and has a diameter at the second end face that is larger than a diameter at the first end face of the first flow path, and the second end face is A second housing engaged with the first housing opposite the first end surface;
A flat valve body having a slit disposed between the first end face and the second end face;
At least one of the first end surface and the second end surface has an end surface convex portion protruding from the end surface,
The flat valve body is pressed by the end surface convex portion ,
The hub with a valve , wherein the diameter of the first flow path gradually decreases from the first end face side toward the opposite side .   2. The hub with a valve according to claim 1, wherein the flat plate-like valve element pressed by the end surface convex portion swells in the second flow path direction.   The hub with a valve according to claim 1 or 2, wherein the end surface convex portion is provided on the second end surface and has an annular shape that continuously surrounds the second flow path. The hub with a valve according to claim 1 or 2, wherein a plurality of the end surface convex portions are provided on the second end surface and provided independently of each other. The hub with a valve according to any one of claims 1 to 4 , wherein the end surface convex portion is provided only on the second end surface. The first end surface has a first end surface convex portion which is the end surface convex portion,
The second end surface has a second end surface convex portion which is the end surface convex portion,
The first end surface convex portion is provided in an inner portion of the second end surface convex portion, and presses the valve body so as to bend in contact with the surface on the first flow path side of the valve body,
The hub with a valve according to claim 1 or 2, wherein the second end surface convex portion contacts and presses the surface of the valve body on the second flow path side.

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