JP2004344546A - Coupling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling device capable of not only forming a sure communication in connecting a cylindrical connection end part provided on the tip of a syringe or a tube, etc., but also preventing a flow rate from becoming excessive inside a tube body. <P>SOLUTION: Along the axial center of an outer cylinder 15, the tube body 5 is provided. A closing member 18 for closing the outer cylinder 15 and the tube body 5 is provided and the closing member 18 is provided with an insertion hole 25 to which the tube body 5 is to be inserted. An energizing means 19 for energizing the closing member 18 in an advancing direction is provided. Inside the tube body 5, a bar-shaped body 7 extended along the axis of the tube body 5 is provided. The bar-shaped body 7 is provided with an interpolation part 8 positioned inside the tube body 5, whose diameter is smaller than the inner diameter of the tube body 5, and a fixation part 10 connected to the interpolation part and fixed to the inner surface of the tube body 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint device, and more particularly, to a joint device that is provided in, for example, a liquid medicine flow path for infusion and connects a syringe, a tube, and the like.
[0002]
[Prior art]
Conventionally, this type of joint device includes a hollow tube extending inside a cylindrical outer cylinder and a tubular member that is inserted inside the outer tube and slidable in the reciprocating direction inside the outer cylinder. (For example, see Patent Document 1).
[0003]
The tubular body has a side hole opened in a peripheral wall near the distal end thereof, and the tubular member closes the side hole when located at the distal end of the thin tube. Thus, when the luer taper portion of the syringe is inserted into the distal end of the outer cylinder, the tubular member pressed by the distal end of the luer taper portion is retracted, and the luer taper portion is in an externally inserted state in the tubular body, and the side of the tubular body When the hole is opened, it becomes conductive. Further, a coil spring is provided inside the outer cylinder, and the coil spring urges the tubular member at the time of retreat in the forward direction. Thus, when the luer taper portion is extracted from the distal end of the outer cylinder, the cylindrical member moves forward by the bias of the coil spring, and the side hole of the tube is closed.
[0004]
By the way, this type of joint device is provided in a chemical liquid flow path for drip, and a syringe, for example, is connected via a luer taper portion to mix another chemical liquid into the chemical liquid flow path. Then, another liquid medicine is injected into the liquid medicine flow path by pressing the piston of the syringe, but a large amount of the liquid medicine remains in the tubular body, and there is a disadvantage that a desired amount of the liquid medicine does not flow into the liquid medicine flow path of the drip. .
[0005]
At this time, if the piston is pressed rapidly, there is nothing to limit the flow rate of the chemical to an appropriate amount, so the flow rate of the chemical flow path temporarily becomes excessive, and the flow rate of the drip in the chemical flow path becomes an appropriate amount. May not be maintained, which may hinder smooth infusion.
[0006]
[Patent Document 1]
JP-A-10-15079
[Problems to be solved by the invention]
The present invention solves such inconvenience, and the present invention not only can form a reliable communication state when a cylindrical connection end provided at the tip of a syringe, a tube, or the like, but also can form a chemical solution into a tube. It is an object of the present invention to provide a joint device capable of reducing the remaining amount of the pipe and preventing an excessive flow rate in the pipe.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, the present invention provides a bottomed cylindrical outer cylinder having a connecting portion that is inserted and opened so as to be connectable by inserting a tubular connected object, along a shaft center of the outer cylinder. An extended hollow rear end communicates with the outside of the bottom of the outer cylinder, and a distal end is located inside the outer cylinder at a predetermined distance from the connection portion and opens in the axial direction toward the connection portion. A tube, a closing member made of an elastic material that is housed in the outer tube so as to be able to advance and retreat in the axial direction and closes the outer tube and the tube at the advanced position, and opposes a tip of the tube in the closing member. A joint having a through hole through which the tube is inserted as the closing member retreats and a biasing means for biasing the closing member in a forward direction, wherein the tube is inserted into the inside thereof. A rod-shaped body attached and extending along the axis of the tube, wherein the rod-shaped body is An inner insertion portion that is located at the portion and has a smaller diameter than the inner diameter of the tube body and forms a gap between the inner surface of the tube body and a part of the inner insertion portion, which maintains communication with the gap. And a fixing portion fixed to the inner surface of the tube.
[0009]
In the joint device of the present invention, when an object to be connected, such as a luer taper provided in a syringe or a tube, is inserted into the connection of the outer cylinder, the closing member is pressed and retracted. Accordingly, the tube is inserted into the insertion hole. Thereby, the closing of the opening at the distal end of the tube is released, and the tube communicates with the syringe, the tube, and the like. Then, when the object to be connected is pulled out from the connection portion of the outer cylinder, the closing member is advanced by the urging force of the urging means. Thereby, the pipe body comes out of the insertion hole of the closing member, and the closing member closes the outer cylinder.
[0010]
In the joint device according to the aspect of the invention, the pipe body includes the rod-shaped body. The rod-like body has a space inside the tube and between the insertion portion of the rod-like body and the pipe, through which a drug solution or the like flows.
[0011]
As described above, since the rod is inserted into the tube, the amount of the drug solution or the like remaining in the tube (in the space between the insertion portion of the rod and the tube) is reduced. Can be small. Thus, the decrease in the amount of the medicinal solution injected from the syringe or other infusion tube into the inside of the tube can be reduced. Further, the flow rate of the drug solution flowing inside the tube can be reduced to the amount passing through the gap, and the flow rate of the drug solution flowing through the tube can be prevented from becoming excessive. That is, for example, when the joint device of the present invention is provided in an infusion channel such as a drip, when a syringe or the like is connected to the joint device of the present invention to inject another drug solution into the infusion channel, Even if the piston is pressed suddenly, it is possible to reliably prevent a rapid inflow of the drug solution into the infusion channel, and to inject an appropriate amount of another drug solution into the infusion channel very easily.
[0012]
Further, in the present invention, the rod-shaped body includes an extending portion which is connected to a distal end of the inner insertion portion and extends from a distal end opening of the tubular body, and an insertion hole of the closing member has an inner diameter. When the closing member closes the connecting portion of the outer cylinder at the advanced position, the extending portion of the rod is inserted into the insertion hole to make the insertion hole smaller than the outer diameter of the extension of the rod. Is closed.
[0013]
According to the present invention, when the closing member closes the connecting portion of the outer cylinder, the extending portion of the rod is inserted into the insertion hole, and the insertion hole is closed by the extending portion of the rod. Is done. Then, for example, a connected object such as a luer taper portion provided in a syringe or a tube is inserted into the connection portion of the outer cylinder, and when the closing member is pressed and receded, the insertion hole is guided by the extending portion of the rod-shaped body and the pipe is guided. The body is inserted. In this way, by providing the extending portion in the rod-shaped body, the pipe can be reliably guided to the insertion hole of the closing member, and the connection of the syringe or the tube can be performed smoothly.
[0014]
Also, at this time, the extending portion of the rod-shaped body is formed with a diameter-enlarging portion which is expanded to have substantially the same diameter as the outer diameter of the tube at a position where the tip opening of the tube is opened. It is preferable that the enlarged diameter portion is inserted into the insertion hole to close the insertion hole when the closing member closes the connection portion of the outer cylinder. The enlarged diameter portion of the extension portion has substantially the same diameter as the outer diameter of the tubular body, so that when the closing member retreats and the tubular body is inserted into the insertion hole, the diameter of the insertion hole rapidly increases. It is possible to smoothly perform the backward movement of the closing member without being deformed, and also to prevent the insertion hole from being damaged due to the insertion of the pipe into the insertion hole, thereby improving the durability of the closing member. it can.
[0015]
Further, in the present invention, the closing member is provided with the insertion hole, and is fitted to the connecting portion of the outer cylinder so as to be removably fitted to the connecting portion. A cylindrical tube contact portion that is in close contact with the peripheral wall in a liquid-tight manner, and an annular pressure contact member that presses the tube contact portion against the tube is provided on the outer periphery of the tube contact portion. I do.
[0016]
In the joint device of the present invention, the flow rate of a chemical solution or the like is limited by providing the rod-shaped body in the pipe. For this reason, if there is a large difference between the flow rate from the syringe or other infusion tube and the flow rate inside the tube, the fluid pressure near the distal end of the tube will increase, and a chemical solution, etc. May enter and cause liquid leakage. Therefore, in the present invention, the pressure contact member is provided to increase the degree of close contact, so that the intrusion of a chemical solution or the like between the tube and the tube close contact portion can be reliably prevented.
[0017]
Further, in the present invention, the outer diameter of the tube is tapered so that the diameter gradually increases toward a rear end. When the closing member retreats along the pipe, the rear end side of the pipe is enlarged in diameter, so that the pressure contact force on the pipe by the pipe contact portion can be increased. Thereby, the pipe body and the pipe body contact portion are securely brought into close contact with each other, and it is possible to reliably prevent a chemical solution or the like from entering between the tube body and the tube body contact portion.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. 1 is an explanatory sectional view showing a joint device of the present embodiment, FIG. 2 is an explanatory sectional view showing a rod-like body, FIG. 3 is an explanatory sectional view of a closing member, and FIG. 4 is a connection state of the joint device of FIG. FIG. 5 is an explanatory sectional view showing a joint device of another embodiment, and FIG. 6 is an explanatory sectional view showing a connection state of the joint device of FIG.
[0019]
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 tube 5 is inserted into the port 3 via a tube support 4. The tube 5 is formed in a pipe shape, and has a base end connected to the port 3. An opening 6 that opens in the axial direction is formed at the tip of the tube 5, and a rod 7 extending along the axis of the tube 5 is mounted inside the tube 5. Have been.
[0020]
As shown in FIGS. 1 and 2, the rod-shaped body 7 has an insertion portion 8 located inside the tube 5 and having a diameter smaller than the inner diameter of the tube 5, and a distal end side of the insertion portion 8. The extension portion 9 is provided continuously, and the fixed portion 10 is provided continuously on the rear end side of the insertion portion 8. The inner insertion portion 8 has a smaller diameter than the inner diameter of the tubular body 5 so as to form a gap between itself and the inner surface of the tubular body 5. The extending portion 9 extends from the distal end of the tube 5, and includes a diameter-enlarging portion 11 that is expanded to have substantially the same diameter as the outer diameter of the tube 5 at a position where the opening 6 of the tube 5 is not closed. ing. The side of the enlarged diameter portion 11 facing the opening 6 of the tubular body 5 is a tapered surface that decreases in diameter toward the opening 6. As shown in FIG. 2, the fixing part 10 is formed in a substantially elliptical shape, and a pair of abutting parts 12 which are in contact with the inner surface of the tube body 5 and which are bonded or press-fitted. And a flat portion 13 which is formed flat and forms an air gap with the inner surface of the tube 5.
[0021]
As shown in FIG. 1, an outer cylinder 15 is connected and supported on the outer periphery of the tube support 4 via a cylindrical outer cylinder support 14. At the distal end of the outer cylinder 15, an insertion portion 17 for inserting a cylindrical connection end portion 16 (see FIG. 4) provided at the distal end of a syringe or a tube (not shown) is formed.
[0022]
As shown in FIG. 1, a rubber closing member 18 is housed inside the outer cylinder 15. The closing member 18 is provided so as to be able to advance and retreat along the tube 5 and is urged in the forward direction by a coil spring 19 as an urging means provided inside the outer cylinder 15. The closing member 18 is prevented from coming off by a flange portion 21 of a press-contact member 20, which will be described later, mounted on the outer periphery of the closing member 18 abuts on a regulating protrusion 22 provided on the inner periphery of the insertion portion 17 of the outer cylinder 15. ing.
[0023]
As shown in FIGS. 1 and 3, the closing member 18 includes a plug 23 that closes the distal end side of the tube 5, and a cylinder that is connected to the rear of the plug 23 and closely adheres to the outer periphery of the tube 5. And a tubular contact portion 24. The plug 23 of the closing member 18 is formed with an insertion hole 25 through which the tube 5 is inserted. As shown in FIG. 1, when the closing member 18 is at the forward position, the enlarged diameter portion 11 formed on the extending portion 9 of the rod 7 is fitted into the insertion hole 25 to be in a closed state. As shown in FIG. 4, when the closing member 18 is retracted, the insertion hole 25 is guided by the enlarged diameter portion 11 of the rod 7, and the tube 5 is inserted.
[0024]
As shown in FIGS. 1 and 3, a metal pressure contact member 20 is mounted on the outer periphery of the tubular body contact portion 24. The press-contact member 20 tightens the entire outer periphery of the tubular body contact portion 24, and presses the tubular body contact portion 24 against the tubular body 5 to make the tubular body closely contact with the tubular body 5. Further, the pressing member 20 is formed with a flange portion 21 that protrudes in a flange shape on the plug portion 23 side. The flange portion 21 serves as a spring seat for the coil spring 19 to prevent damage to the closing member 18 due to contact with the rubber closing member 18 to reliably apply a biasing force. Of the insertion member 17 to prevent the closing member 18 from coming off. The pressure contact member 20 maintains the liquid tight state between the tube contact portion 24 and the tube 5, and can reliably prevent liquid leakage when the closing member 18 moves forward and backward.
[0025]
According to the joint device 1 having the above configuration, as shown in FIG. 4, when the connection end 16 provided at the tip of a syringe or a tube (not shown) is inserted into the insertion portion 17 of the outer cylinder 15, The closing member 18 pressed by the connection end 16 is retracted. At this time, since the enlarged-diameter portion 11 is formed in the extending portion 9 of the rod-shaped body 7, the insertion of the tube 5 is performed smoothly without a sudden increase in the diameter of the insertion hole 25 of the closing member 18. . Thereby, the retreating movement of the closing member 18 can be performed smoothly, and damage to the insertion hole 25 due to insertion into the insertion hole 25 is prevented, so that the durability of the closing member 18 can be improved.
[0026]
Then, the opening 6 of the tube 5 penetrating the insertion hole 25 is opened, and the connection end 16 and the port 3 of the three-way cock 2 communicate with each other through the tube 5. At this time, when the chemical is injected from the connection end 16 toward the pipe 5, the pipe 5 is provided with the rod-shaped body 7 and the flow rate of the chemical is restricted, so that the chemical is injected into the three-way cock 2. A rapid injection is prevented. Further, when the flow rate of the chemical solution is restricted by the rod-shaped body 7 of the tube 5, the liquid pressure around the tube 5 increases, and the chemical solution tries to enter between the closing member 18 and the tube 5. Since the tube contact portion 24 of the closing member 18 is pressed against the tube 5 by the pressure contact member 20, the intrusion of the chemical solution between the tube contact portion 24 and the tube 5 is prevented.
[0027]
Thereafter, when the connection end portion 16 is pulled out from the insertion portion 17 of the outer cylinder 15, the closing member 18 moves forward by the urging force of the coil spring 19, and when the tube 5 comes out of the insertion hole 25, the insertion hole is removed. The enlarged diameter portion 11 of the rod 7 is inserted into the rod 25, and the opening 6 of the tube 5 is closed.
[0028]
Next, another embodiment of the present invention will be described. As shown in FIGS. 5 and 6, the joint device 26 of the other embodiment is provided in one port 3 of the three-way cock 2 similarly to the above-described embodiment. A tube 27 having a shape different from that of the body 5 is provided. 5 and 6, the same reference numerals as those in FIGS. 1 and 4 denote the same parts, and a description thereof will be omitted.
[0029]
As shown in FIGS. 5 and 6, the pipe 27 provided in the joint device 26 of another embodiment is formed of a hard synthetic resin (for example, polyacetal), and the rod-shaped body 7 is inserted therein. ing.
[0030]
The tubular body 27 is formed in a tapered shape whose outer diameter gradually increases toward the rear end. At the rear end of the tubular body 27, a flange portion 28 is formed, which protrudes in a flange shape and is in contact with the edge of the cylindrical outer cylinder support portion 14. At the rear of the flange portion 28, a fixed leg portion 29 which is interposed and fixed between the outer cylinder support portion 14 and the tube body support portion 4 is integrally and continuously provided. The flange 28 is a spring seat that abuts on the rear end of the coil spring 19 to prevent the outer cylinder support 14 from being damaged due to the contact between the coil spring 19 and the outer cylinder support 14.
[0031]
The bending strength of the tubular body 27 configured as described above is improved by the enlarged rear end, and the bending of the tubular body 27 when the tubular body 27 is inserted into the insertion hole 25 can be reliably prevented.
[0032]
As shown in FIG. 6, when a connection end 16 provided at the tip of a syringe or a tube (not shown) is inserted into the insertion portion 17 of the outer cylinder 15, the obstruction pressed by the connection end 16. When the member 18 retreats, the tube contact portion 24 of the closing member 18 is pressed against the enlarged diameter portion of the tube 27, and the degree of adhesion between the tube contact portion 24 and the tube 27 can be improved. As a result, even if the flow rate of the chemical solution injected from the connection end 16 toward the pipe 27 is restricted by the rod 7 of the pipe 27 and the fluid pressure around the pipe 27 rises, the pipe tightly adheres. Invasion of the chemical solution between the portion 24 and the tube 27 can be more reliably prevented.
[0033]
In this embodiment, the rod-shaped body 7 is provided with the enlarged-diameter portion 11 in the extending portion 9, but other than that, although not shown, the insertion portion without the enlarged-diameter portion 11 is provided. The extension portions having the same diameter may be extended from the distal ends of the tubular bodies 5 and 27. In this case, it goes without saying that the inner diameter of the insertion hole 25 of the closing member 18 is smaller than the outer diameter of the extension portion (the outer diameter of the inner insertion portion 8). Although not shown, the rod-shaped body 7 does not need to be provided with the extension 9.
[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 rod-shaped body.
FIG. 3 is an explanatory sectional view of a closing member.
FIG. 4 is an explanatory sectional view showing a connection state of the joint device of FIG. 1;
FIG. 5 is an explanatory sectional view showing a joint device according to another embodiment.
FIG. 6 is an explanatory sectional view showing a connection state of the joint device of FIG. 5;
[Explanation of symbols]
1, 26 ... joint device, 5, 27 ... pipe, 7 ... rod, 8 ... insertion part, 9 ... extension part, 10 ... fixing part, 11 ... large diameter part, 15 ... outer cylinder, 16 ... connection Ends (objects to be connected), 17: connecting portions, 18: closing members, 19: coil springs (biasing means), 20: press-contact members, 23: plug portions, 24: tube contact portions, 25: insertion holes.

Claims (5)

A cylindrical outer cylinder with a bottom provided with a connecting portion at the front end, which is openably connectable by inserting a tubular connected object, and a rear end extending along the axis of the outer cylinder and having a rear end outside the bottom of the outer cylinder. A hollow pipe body whose tip is located inside the outer cylinder at a predetermined distance from the connection part and opens in the axial direction toward the connection part, and A closing member made of an elastic material that is retractably housed and closes the outer cylinder and the tube at the forward position, and a position facing the tip of the tube in the closing member, with the closing member retreating, In a joint device including an insertion hole through which a pipe is inserted, and an urging unit that urges the closing member in a forward direction,
The tubular body includes a rod-like body inserted therein and extending along an axis of the tubular body,
The rod-shaped body is formed inside the tubular body, has an inner diameter smaller than the inner diameter of the tubular body and forms a gap between the inner surface of the tubular body, and a part of the inner inserted portion. And a fixing portion that is fixed to the inner surface of the pipe while maintaining communication with the gap. The rod-shaped body is provided with an extending portion that is connected to a distal end of the insertion portion and extends from a distal end opening of the tubular body,
The insertion hole of the closing member has an inner diameter smaller than the outer diameter of the extending portion of the rod-shaped body, and the extending portion of the rod-shaped body is closed when the closing member closes the connection portion of the outer cylinder at the forward position. 2. The joint device according to claim 1, wherein the plug is inserted into the insertion hole to close the insertion hole. The extending portion of the rod-shaped body is formed with a diameter-enlarging portion which is expanded to have substantially the same diameter as the outer diameter of the tube at a position where the tip opening of the tube is opened,
The joint device according to claim 2, wherein the enlarged diameter portion is inserted into the insertion hole to close the insertion hole when the closing member closes the connection portion of the outer cylinder. The closing member is provided with the insertion hole, and is fitted to the connecting portion of the outer cylinder so as to be removably fitted to the plug. And a cylindrical pipe contact portion that
The joint device according to any one of claims 1 to 3, wherein an annular pressure-contact member that presses the tube-contact portion to the tube is provided on an outer periphery of the tube-contact portion. The joint device according to any one of claims 1 to 4, wherein the tubular body is formed in a tapered shape whose outer diameter gradually increases toward a rear end.

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