JP4323466B2 - Connector cap - Google Patents

Description

  The present invention relates to a cap attached to a connector such as a medical three-way stopcock.

  Conventionally, as a cap to be attached to an infusion connector such as a three-way stopcock, one disclosed in Patent Document 1 below is known. In such a conventional cap, as shown in the front page of Patent Document 1 below, a female screw part screwed to the connection tool and a male luer part connected to the liquid passage of the connection tool are made of resin. A rubber plug and a cylindrical portion that covers the rubber plug are attached to the tip (in the direction opposite to the connection tool). The cylindrical portion is formed so that the female screw portion at the tip of the syringe is screwed, and the rubber stopper has a slit so that the male luer portion of the syringe is inserted.

  In such a conventional cap, the outer peripheral surface of the female screw portion is grasped with a finger and screwed to the male screw portion of a connection tool such as a three-way stopcock. At that time, in the medical field, such a work is often performed in a hurry, and the cap is often screwed to the connecting tool with a very strong force for rushing the work.

However, many connecting tools such as three-way stopcocks and caps are made of resin, and the size is not so large, so the strength is not so strong. Therefore, if too much force is applied when screwing them together, the connector may be damaged. When the connection tool is damaged in this manner, there arises a disadvantage that the damaged connection tool must be replaced. Further, when the cap is screwed to the connecting tool more strongly than necessary, it is difficult to remove the cap when the connecting tool is subsequently removed, and the connecting tool may be damaged when the cap is removed.
Special table hei 8-500983 gazette (front page)

  The present invention aims to improve a cap for a connection tool, and more specifically, in order to eliminate the inconvenience, when connecting a flow path for infusion, an operator attaches the cap to the connection tool with a strong force. Even if it is going to be, it aims at providing the cap for connection tools which can be screwed to a connection tool by appropriate force.

  In order to achieve the above object, a cap for a connector according to the present invention is a cap screwed into a connector for infusion, and a liquid passage that allows liquid to pass between a proximal end and a distal end; A cylinder having a female screw portion provided around the base end side of the liquid passage, a large diameter portion having a larger inner diameter and a smaller diameter portion having a smaller inner diameter in order from the distal end side, constituting a part of the liquid passage. A main body integrally formed with the part, an outer cylinder part rotatably mounted on the outer periphery of the cylindrical part, and a smaller diameter than the large-diameter part of the cylindrical part in the center on the distal end side of the outer cylindrical part And a rubber plug that is sandwiched between the small diameter portion of the cylindrical portion and the disk portion of the rotating member and shields the liquid passage in a liquid-tight manner. And when the rotational force is applied to the rotating member with respect to the main body, the rubber is used when the rotational force is below a reference value. The rotation of the rotating member is suppressed by the frictional force of the rubber plug, and the rubber plug is clamped so that the rotating member rotates when the rotational force exceeds the reference value. The female screw portion is set to a force necessary for screwing onto the connecting tool.

  According to the connection tool cap of the present invention, the rubber plug is held between the main body and the rotating member, and when the rotating member is rotated with respect to the main body, Resistance force is generated by frictional force. In the present invention, when the force for rotating the rotating member is equal to or less than a reference value, which is a force necessary for screwing the female screw portion of the main body to the connector, the rotating member is applied to the main body. It does not rotate. Therefore, when the rotating member is gripped and the female screw portion of the main body is screwed into the connecting tool, the female screw portion is securely screwed to the prescriptive tool.

  Further, when the user rotates the rotating member with a force exceeding the reference value, the rotational force exceeds the frictional force between the main body, the rotating member, and the rubber plug. It rotates with respect to the main body. Therefore, the female screw portion of the main body is not screwed to the connection tool with an excessive force. For this reason, there is no possibility that the said connection tool will be damaged, and when removing the cap of this invention from a connection tool, it can remove with a light force.

  Moreover, in the cap for connection tools of this invention, it is preferable that the inner periphery of the front end side of the small diameter part of the said cylindrical part protrudes toward the front end direction. By setting the shape of the small-diameter portion to such a shape, the inner peripheral edge on the distal end side of the small-diameter portion is in a state of being bitten into the rubber plug. Therefore, even when an injection needle or the like is inserted into the rubber plug, the rubber plug is securely held between the small diameter portion and the disc portion of the rotating member, and the rubber plug is pushed into the main body. It will not be.

  It is preferable that the disk part of the rotating member has a protruding part that protrudes from the periphery of the insertion part toward the proximal direction on the inner surface thereof. Thus, when the protrusion part is provided around the insertion part, the disk part around the insertion is reinforced by the protrusion part. Therefore, even when the rubber plug is clamped between the disc portion and the small diameter portion of the cylindrical portion, deformation of the disc portion is suppressed, and the rubber plug can be securely clamped with a predetermined force. .

  Next, an example of an embodiment of the cap for a connector according to the present invention will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the connector cap 1 of the present invention is a cap that is screwed onto an infusion connector such as a three-way stopcock 2. The cap 1 includes a main body 3 made of polypropylene, a rotating member 4, and a rubber plug 5 made of butyl rubber. When the internal structure is seen with reference to FIG. 2, the center part is the liquid passage 6, and the male luer part 7 is provided toward the base end side (side screwed to the three-way cock 2). Yes. On the outer periphery of the male luer part 7, a cylindrical female screw part 8 is provided so as to surround the male luer part 7. An internal thread is provided on the inner peripheral surface of the internal thread portion 8 so that the internal thread portion 10 can be screwed to the external thread portion 10 provided at the tip of the connection portion 9 of the three-way cock 2. Further, on the outer peripheral surface of the female screw portion 8, there is provided a protrusion 11 that protrudes in the outer peripheral direction and extends in the axial direction.

  Further, in the main body 3, a cylindrical cylindrical portion 12 is provided from the female screw portion 8 toward the tip direction (a direction away from the three-way cock 2). The cylindrical portion 12 has a small diameter portion 13 having a small inner diameter and a large diameter portion 14 having a large diameter. Further, the inner peripheral edge 13a on the distal end side of the small diameter portion 13 protrudes toward the distal end side. On the outer peripheral surface of the cylindrical portion 12, a fitting protrusion 15 that protrudes in the circumferential direction is provided. In the main body 3, a male luer part 7, a female screw part 8, and a cylindrical part 12 are integrally formed by resin molding.

  As shown in FIG. 1, the rotating member 4 includes a cylindrical outer cylinder portion 16 and a disk portion 17 that is integrally provided on the distal end side of the outer cylinder portion 16. The disc portion 17 has an insertion hole 18 through which a syringe needle (not shown; the same applies hereinafter) can be inserted at the center, and the inner diameter of the insertion hole 18 is a large one provided in the cylindrical portion 12 of the main body 3. The diameter is smaller than the diameter portion 14. Further, as shown in FIG. 2, the disc portion 17 has a projecting portion 19 projecting toward the proximal end on the inner peripheral surface around the insertion hole 18.

  In addition, a fitting groove 20 is provided on the inner circumferential surface of the outer cylinder portion 16 to be fitted into the fitting protrusion 15 provided on the outer circumferential surface of the cylindrical portion 12 of the main body 3. Further, on the outer peripheral surface of the outer cylinder portion 16, a protrusion 21 that protrudes in the outer peripheral direction and extends in the axial direction is provided.

  As shown in FIG. 2, the rubber plug 5 has a large-diameter portion 22 having a large diameter in the center in the axial direction. Further, the end portion of the rubber plug 5 in the axial direction protrudes from the large-diameter portion 22 in a truncated cone shape, and its end surface is recessed inward. The distal end side of the rubber plug 5 is exposed to the outside through the insertion hole 18 of the rotating member 4.

  The cap 1 of this embodiment is formed by the main body 3, the rotating member 4 and the rubber plug 5. When assembling these members, the rubber plug 5 may be inserted into the cylindrical portion 12 of the main body 3, and then the rotating member 4 may be pushed over the cylindrical portion 12 and pushed in the proximal direction. By doing so, the fitting protrusion 15 provided on the outer periphery of the cylindrical portion 12 and the fitting groove 20 provided on the inner peripheral surface of the outer cylinder portion 16 of the rotating member 4 are fitted, and the rotating member 4 is engaged. Is held rotatably with respect to the main body 3.

  In a state where these are combined, the width between the tip edge 13 a of the small-diameter portion 13 in the cylindrical portion 12 of the main body 3 and the protruding portion 19 formed on the disc portion 17 of the rotating member 4 is large. Since the diameter portion 22 is narrower than the axial width, the large-diameter portion 22 of the rubber plug 5 is sandwiched between the main body 3 and the rotating member 4. As described above, when the large-diameter portion 22 of the rubber plug 5 is sandwiched between the small-diameter portion 13 and the projecting portion 19, both the member and the rubber are used to rotate the rotating member 4 with respect to the main body 3. The rotation of the rotation member 4 is suppressed by the frictional force with the stopper 5. When the rotating member 4 is rotated beyond the frictional force, the rotating member 4 is rotated with respect to the main body 3.

  In this embodiment, the turning force when the rotating member 4 starts to rotate with respect to the main body 3 exceeding the frictional force with the rubber plug 5 is determined as a reference value, and this reference value is set as the female screw portion 8 of the main body 3. Is adjusted to a value necessary to be properly screwed to the connector such as the three-way stopcock 2. As a numerical value, 0.19 to 0.50 N · m is preferable, and it is desirable to change appropriately depending on the size of the connection tool to be applied. In this embodiment, in order to set the rotational force of the rotating member 4 to the reference value, the hardness of the rubber plug 5 and the thickness of the large-diameter portion 22 are appropriately adjusted. Accordingly, in the manufacturing process of the cap 1, if a plurality of rubber plugs 5 having different hardnesses and thicknesses of the large diameter portions 22 are prepared in advance, various reference values can be obtained simply by changing the rubber plugs 5 according to applications. The cap 1 having the above can be easily manufactured.

  Next, the case where the cap 1 of this embodiment is used in a medical field will be described. In the medical field, the three-way stopcock 2 is often used to mix a drug solution from a syringe or the like with a drug solution for infusion. For example, a tube extending from a drip medicinal solution bag is connected to the left connection port of the three-way cock 2 shown in FIG. 1, and the male luer part on the right side of FIG. 1 is connected to a tube extending to the patient side (not shown). Then, the cap 1 is screwed into the connecting portion 9 located at the center in FIG.

  At this time, the user holds the rotating member 4 of the cap 1 and screwes the female screw portion 8 of the cap 1 into the male screw portion 10 provided in the connection portion 9 of the three-way cock 2. In the cap 1 of the present embodiment, since the outer diameter of the outer cylindrical portion 16 of the rotating member 4 is larger than the outer diameter of the female screw portion 8 of the main body 3, the rotating member 4 is gripped naturally. Can work.

  When the user grips the rotating member 4 and screwes the female screw portion 8 into the male screw portion 10, the rotating member 4 is attached to the main body 3 until a force necessary for screwing them is applied. Therefore, the rotating member 4 can be rotated like a normal cap. At this time, since the protrusion 11 is provided on the outer peripheral surface of the outer cylindrical portion 16 of the rotating member 4, the user can rotate the rotating member 4 without sliding his / her hand.

  When the rotating member 4 is rotated with a force greater than that required for screwing the female screw portion 8 and the male screw portion 10, the rotating member 4 rotates with respect to the main body 3. As described above, the female screw portion 8 and the male screw portion 10 are not strongly screwed together. Thus, since the cap 1 of the present embodiment is screwed with a force necessary to securely screw both members, the cap 1 can be reliably connected to the connection portion 9 of the three-way stopcock 2. it can.

  Further, since the liquid passage 6 is closed with the rubber plug 5 in the cap 1 of the present embodiment, the drug solution in the syringe is injected into the three-way cock 2 by inserting the needle of the syringe into the rubber plug 5. Can do. At this time, since the large diameter portion 22 of the rubber plug 5 bites into the inner peripheral edge 13a on the distal end side of the small diameter portion 13 of the cylindrical portion 12, it is not pushed inward of the cylindrical portion 12 by the puncture of the injection needle.

  When it is necessary to remove the cap 1 from the three-way cock 2, the user holds the outer peripheral portion of the female screw portion 8 of the main body 3 and rotates the cap 1 in the direction in which the cap 1 is removed. At this time, when the cap 1 is screwed to the three-way stopcock 2, the cap 1 is screwed with a force necessary for the coupling, and since it is not screwed with a force beyond that, the cap 1 is removed with a light force. be able to. Moreover, since the protrusion 21 is provided also in the outer peripheral surface of the internal thread part 8, the user can rotate the cap 1 easily.

  As described above, the cap 1 of the present embodiment can be screwed with only a necessary force when screwed to a connecting tool such as the three-way stopcock 2 and lightly when releasing the screwing. Therefore, there is no possibility of damaging the connection tool such as the three-way stopcock 2.

  In addition, in the said embodiment, although the main body 3 and the rotation member 4 are formed with the polypropylene, you may use not only this but another synthetic resin. The rubber plug 5 is made of butyl rubber, but other elastic members may be used. Moreover, although the large diameter part 22 is provided in the rubber plug 5 in the said embodiment, not only the said structure but a rubber plug of various shapes, such as a shape which does not have a large diameter part, can be used. . Further, the connection tool is not limited to the three-way cock 2 and can be connected to various connection tools.

Explanatory drawing which shows the cap and three-way cock which are an example of embodiment of this invention. Sectional drawing which shows the state which cut | disconnected the cap of this embodiment to the axial direction.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cap, 2 ... Three-way stopcock (connector), 3 ... Main body, 4 ... Rotating member, 5 ... Rubber stopper, 6 ... Liquid passage, 8 ... Female thread part, 12 ... Cylindrical part, 13 ... Small diameter part, 14 ... large diameter part, 16 ... outer cylinder part, 17 ... disc part, 18 ... insertion hole.

Claims (3)

A cap screwed onto the infusion connector,
A liquid passage that allows liquid to pass inside between the base end and the tip, a female screw portion provided around the base end of the liquid passage, and a part of the liquid passage, and an inner diameter in order from the tip side A main body integrally formed with a cylindrical portion having a large diameter portion having a large diameter and a small diameter portion having a small diameter;
An outer cylinder part rotatably mounted on the outer periphery of the cylindrical part, and a disk part provided with an insertion hole having a smaller diameter than the large diameter part of the cylindrical part at the front end side of the outer cylinder part; A rotating member having
A rubber stopper that is sandwiched between the small diameter portion of the cylindrical portion and the disc portion of the rotating member and shields the liquid passage in a liquid-tight manner;
When turning force is applied to the rotating member with respect to the main body, when the turning force is below a reference value, the turning of the turning member is suppressed by the frictional force of the rubber plug, and the turning force is When the reference value is exceeded, the rubber plug is clamped so that the rotating member rotates,
The connector cap according to claim 1, wherein the reference value is set to a force necessary for screwing the female screw portion of the main body to the connector.   2. The connector cap according to claim 1, wherein an inner peripheral edge on a distal end side of the small diameter portion of the cylindrical portion protrudes toward the distal end direction.   3. The connection tool according to claim 1, wherein the disk portion of the rotating member has a protruding portion that protrudes toward the proximal direction from the periphery of the insertion portion on the inner surface thereof. cap.

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