JP2004105574A - Coupling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling device which surely prevents a liquid leakage from a side hole from occurring, and can smoothly perform the advancing/retracting of a cylindrical member, and in addition, is compact. <P>SOLUTION: A hollow thin tube 5 which is housed in a bottomed cylindrical body 8, the rear end of which communicates with the outside of the bottom part of the body 8, and which has the side hole 6 opening on the peripheral wall in a vicinity of the closed distal end is provided. A cylindrical member 11 made of an elastic material which is freely slidably fitted on the distal end part of the thin tube 5 and closes the side hole of the thin tube 5 is provided. A tapered member 13 which is fitted on the thin tube 5 in the body 8, and the diameter of which is gradually expanded to the rear end part of the body 8 is provided. The tapered member 13 elastically expands the diameter of the cylindrical member 11 by the larger diameter side of the tapered member 13 when the cylindrical member 11 retracts and opens the side hole 6 of the thin tube 5, and imparts an urging force in the advancing direction to the cylindrical member 11 by the restoring elasticity in the diameter contracting direction of the cylindrical member 11. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint device, and more particularly to, for example, a joint device that is provided in a chemical liquid flow path for infusion and connects a cylindrical connection end provided at a distal end of a tube or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, this type of joint device includes a hollow thin tube extending inside a cylindrical main body, and a tubular member that is inserted into the thin tube inside the main body and is slidable in the reciprocating direction ( For example, see Patent Document 1).
[0003]
The thin tube has a side hole opened in a peripheral wall near the closed end, and the tubular member closes the side hole when located at the tip of the thin tube. Thus, when a luer taper or the like of a syringe is inserted into the distal end of the main body, the cylindrical member pressed by the cylindrical connection end provided at the distal end of the syringe, the tube, or the like retreats and the side hole of the thin tube is opened. At the same time, the thin tube enters the inside of the connection end and becomes conductive. Also, a coil spring is provided inside the main body, and the coil spring urges the tubular member at the time of retreat in the forward direction. Thus, when the connection end is pulled out from the tip of the main body, the tubular member advances due to the bias of the coil spring, and the side hole of the thin tube is closed.
[0004]
By the way, in such a configuration, it is desirable to surely prevent leakage of a chemical solution or the like from the side hole at the time of closing. Then, in order to improve the sealing performance when the side member is closed by the cylindrical member, it is conceivable to increase the pressure contact force of the cylindrical member on the peripheral surface of the narrow tube. However, when the pressing force of the cylindrical member against the peripheral surface of the thin tube is increased, the resistance when the cylindrical member slides along the thin tube increases accordingly. For this reason, when the connection end is pulled out from the tip of the main body, in order to quickly advance the tubular member and close the side hole, the biasing force is increased by increasing the diameter and length of the coil spring. Therefore, there is a disadvantage that the size of the joint device is increased accordingly.
[0005]
[Patent Document 1]
JP-A-10-15079
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact joint device which can reliably prevent liquid leakage from a side hole, smoothly move a cylindrical member forward and backward, and solve the problem. .
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a joint device of the present invention includes a bottomed cylindrical main body, a rear wall housed inside the main body, a rear end communicating with a bottom outside of the main body, and a peripheral wall near a closed front end. A hollow thin tube having a side hole that opens into the hollow tube; a tubular member made of an elastic material that is slidably inserted at the tip of the thin tube to close the side hole of the thin tube; A taper member that is inserted and gradually expands in diameter toward the rear end of the main body, and the taper member is formed when the cylindrical member retreats and opens the side hole of the thin tube. The cylindrical member is elastically expanded in diameter by the large diameter side, and a biasing force in a forward direction is applied to the cylindrical member by a restoring elasticity of the cylindrical member in a diameter reducing direction.
[0008]
According to the joint device of the present invention, for example, when a cylindrical connection end provided at the distal end of a syringe, a tube, or the like is inserted into the main body, the cylindrical member pressed against the connection end. Is retracted along the capillary. Along with this, the side hole of the thin tube closed by the cylindrical member is opened, and the side hole of the thin tube communicates in a state of being inserted into the connection end of a syringe, a tube, or the like.
[0009]
On the other hand, the cylindrical member slides toward the large diameter side of the tapered member by retreating. As a result, the elasticity of the cylindrical member itself is reduced in the diameter reducing direction, and the cylindrical member attempts to move toward the small diameter side of the tapered member, so that the cylindrical member is urged in the forward direction. Thereafter, when the connection end of the syringe, the tube, or the like is pulled out from the main body, the cylindrical member is guided to the small diameter side of the taper member while being reduced in diameter by its restoring elasticity, and advances. In this way, the tube advances to the tip of the thin tube, and the tubular member closes the side hole of the thin tube.
[0010]
As described above, according to the present invention, since the cylindrical member itself generates the restoring elasticity in the diameter reducing direction by the tapered member and moves forward, the cylindrical member is formed in order to improve the sealing performance when the side hole of the thin tube is closed. Even if the sliding resistance of the tubular member along the thin tube increases when the pressure contact force of the member to the peripheral surface of the thin tube increases, the restoration elasticity in the diameter reduction direction also increases when the diameter is increased by the tapered member. , The side holes can be smoothly closed.
[0011]
Further, since the urging force in the forward direction can be applied to the tubular member only by providing the tapered member without providing the conventional coil spring, the joint device can be made compact.
[0012]
In the present invention, it is preferable that the cylindrical member has a plurality of annular projections arranged in the axial direction on at least an inner surface thereof in contact with the tapered member. Thereby, a plurality of annular projections can be brought into contact with the outer peripheral surface of the thin tube to obtain sufficient sealing performance, and the plurality of annular projections can reduce the contact area between the cylindrical member and the tapered member. As a result, the resistance at the time of sliding can be reduced, and the tubular member can be smoothly advanced and retracted.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory sectional view showing the joint device of the present embodiment, and FIG. 2 is an explanatory sectional view showing a connection state of the joint device of FIG.
[0014]
The joint device 1 of the present embodiment is provided at one port 3 of a three-way cock 2 as shown in FIG. A metal thin tube 5 is inserted into the port 3 via a tubular thin tube support 4. The thin tube 5 is formed in a hollow shape, and has a base end connected to the port 3. The tip of the thin tube 5 is closed, and a side hole 6 is formed in a peripheral wall near the tip.
[0015]
As shown in FIGS. 1 and 2, an outer cylinder 8 is connected and supported on the outer periphery of the thin tube support 4 via a cylindrical outer cylinder support 7. At the distal end of the outer cylinder 8, there is formed an insertion portion 10 for inserting a cylindrical connection end 9 (see FIG. 2) provided at the distal end of a syringe or a tube (not shown). In the present embodiment, the main body of the present invention is constituted by the three-way cock 2, the thin tube support 4, the outer tube support 7, and the outer tube 8.
[0016]
Inside the outer tube 8, a rubber tubular member 11 is attached to the tip of the thin tube 5 so as to be able to advance and retreat, and the tubular member 11 closes the side hole 6 of the thin tube 5. In addition, a tapered member 13 having a tapered surface 12 whose diameter gradually increases toward the rear end is externally inserted into the thin tube 5.
[0017]
A contact surface 14 that is exposed at the insertion portion 10 of the outer cylinder 8 and is in contact with a connection end 9 of a syringe or a tube (not shown) is formed at a distal end of the cylindrical member 11. A convex portion 15 protruding outward is formed on the outer periphery of the distal end of the cylindrical member 11, and the convex portion 15 is regulated by a restricting portion 16 protruding from the inner periphery of the insertion portion 10 of the outer cylinder 8. It has been locked.
Further, the position where the side hole 6 is closed in the cylindrical member 11 is formed in a shape in which a plurality of annular thin portions 17 and a plurality of annular thick portions 18 are alternately arranged. Each thick portion 18 forms an annular convex portion on the inner surface of the tubular member 11, and when the tubular member 11 is retracted, the inner peripheral surface of each thick portion 18 is formed on the tapered surface 12 of the tapered member 13. Because of the sliding contact, the cylindrical member 11 can be smoothly retracted with a small sliding resistance.
[0018]
As shown in FIG. 2, when a connection end 9 provided at the tip of a syringe or tube (not shown) is inserted into the insertion portion 10 of the outer cylinder 8, first, the connection end 9 is pressed by the connection end 9. The cylindrical member 11 retreats, and the side hole 6 of the thin tube 5 is opened. At this time, since the thin tube 5 is relatively inserted into the connection end portion 9, the connection end portion 9 communicates with the port 3 of the three-way cock 2 via the thin tube 5.
[0019]
Further, at this time, the cylindrical member 11 is retracted, and the diameter is increased by the large diameter side of the tapered member 13. As a result, the tubular member 11 itself has a resilient elasticity in the diameter reducing direction. As a result, a force (biasing force in the forward direction) is generated in the tubular member 11 to move the tapered member 13 toward the small diameter side.
[0020]
Thereafter, when the connection end portion 9 is pulled out from the insertion portion 10 of the outer cylinder 8, the cylindrical member 11 slides along the tapered surface 12 of the tapered member 13 toward the small diameter side by the restoring force in the diameter reducing direction. Then, the side hole 6 of the thin tube 5 is quickly and reliably closed by the tubular member 11. When the pressing force of the cylindrical member 11 against the peripheral surface of the thin tube 5 is further increased, the sliding resistance of the cylindrical member 11 along the thin tube 5 increases, but when the diameter is increased by the tapered member. Since the restoration elasticity in the diameter-reducing direction also increases, the side hole can be smoothly closed without any trouble, and a high sealing property can be obtained when the side hole 6 is closed, so that liquid leakage can be reliably prevented. Further, according to the present embodiment, the biasing force in the forward direction can be applied to the tubular member 11 only by providing the tapered member 13, so that, for example, as compared with the case where a coil spring is provided as in the related art. And can be made compact.
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view showing a joint device according to an embodiment of the present invention.
FIG. 2 is an explanatory sectional view showing a connection state of the joint device of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Joint device, 5 ... Thin tube, 6 ... Side hole, 8 ... Outer cylinder (main body), 11 ... Cylindrical member, 13 ... Tapered member, 18 ... Thick part (convex part).

Claims (2)

A bottomed cylindrical body,
A hollow thin tube which is housed inside the main body, has a rear end communicating with the outside of the bottom of the main body, and has a side hole opened to a peripheral wall near the closed front end;
A tubular member made of an elastic material that is slidably inserted at the tip of the thin tube and closes a side hole of the thin tube;
A tapered member which is inserted into the thin tube inside the main body and gradually increases in diameter toward the rear end of the main body,
The tapered member resiliently expands the cylindrical member by the large diameter side of the tapered member when the cylindrical member retreats and opens the side hole of the thin tube, and the tapered direction of the cylindrical member is reduced. A joint device for applying an urging force in the forward direction to the cylindrical member by the resilient elasticity of the joint member. 2. The joint device according to claim 1, wherein the tubular member has a plurality of annular protrusions arranged in an axial direction on at least an inner surface thereof in contact with the tapered member. 3.

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