JP4443162B2 - Fitting device - Google Patents

Description

  The present invention relates to a joint device, and more particularly, to a joint device that is provided in, for example, an infusion chemical liquid flow path and connects a syringe, a tube, or the like.

  Conventionally, this type of joint device includes a hollow tube extending inside a cylindrical outer cylinder, and a cylindrical member that is externally inserted into the tube and slidable in the advancing and retracting direction. (For example, refer to Patent Document 1).

  The tubular body is formed with a side hole that opens in a peripheral wall near the closed tip, and the tubular member closes the side hole when positioned at the tip of the tubular body. As a result, when a syringe luer taper or the like is inserted into the distal end of the outer cylinder, the tubular member pressed by the tubular luer taper provided at the distal end of the syringe or tube or the like is retracted, and the side hole of the tubular body is Simultaneously with the opening, the tube enters the inside of the luer taper portion and becomes conductive. In addition, a coil spring is provided inside the outer cylinder, and the cylindrical member is urged forward by the coil spring in the forward direction. Thereby, when the said luer taper part is extracted from the front-end | tip of an outer cylinder, a cylindrical member advances by the urging | biasing of this coil spring, and the side hole of a tubular body is obstruct | occluded.

However, according to such a conventional configuration, when the luer taper portion is inserted into the distal end of the outer cylinder, if the insertion state is insufficient, the receding distance of the cylindrical member is reduced, and the tube body The side holes may not be completely opened. When the opening of the side hole of the tubular body is incomplete, there is a disadvantage that a sufficient communication state cannot be obtained, for example, the smooth flow of the chemical solution is hindered.
JP-A-10-15079

  The present invention eliminates such inconvenience, and the present invention has a simple structure joint that can form a reliable communication state with a tubular body when a cylindrical connection object provided at the tip of a syringe or tube is connected. An object is to provide an apparatus.

In order to achieve such an object, a first aspect of the joint device of the present invention includes a bottomed cylindrical outer cylinder provided with a connecting portion that is open to be connectable by inserting a cylindrical connection object, Extending along the axis of the outer cylinder, the rear end communicates with the outside of the bottom of the outer cylinder, and the front end is located within the outer cylinder at a predetermined distance from the connecting portion and is connected to the connecting portion. A hollow tubular body that opens in the axial direction, and a closing member that is housed in the outer cylinder so as to be movable forward and backward in the axial direction and that closes the outer cylinder and the tubular body in an advanced position, and the closing member a position opposing to the tip of the tube body in a through hole of the tubular body along with the retraction of the closure member is inserted, when the front Symbol tube penetrates the insertion hole, retracted along the tube body it includes a biasing means for biasing the the closing member in the forward direction, the closing member, the insertion hole A plug portion that is detachably fitted to the connection portion of the outer cylinder, and a cylindrical tube contact portion that is connected to the rear end of the plug portion and is in close contact with the outer peripheral wall of the tube. Provided with a fastening means for tightening from the outer periphery of the plug portion in the direction of closing the insertion hole when the plug portion is fitted to the connection portion of the outer cylinder, An annular pressure contact member is provided in which the tubular body contact portion is brought into pressure contact with the tubular body when the portion is fitted to the connecting portion of the outer cylinder and when the closing member moves forward and backward .

According to the joint device of the present invention, for example, when a luer taper portion (cylindrical connected object) provided at the tip of a syringe, a tube, or the like is inserted into the outer cylinder, the blocking member is pressed and the tubular body Retreated along. Along with this, the tubular body passes through the blocking member through an insertion hole formed in the blocking member. Since the distal end of the tubular body is open in the axial direction, when the distal end of the tubular body penetrates the closing member, the closure of the distal end opening of the tubular body is released, and a luer taper portion such as a syringe or a tube Communicate with. Thus, the joint device of the present invention can reliably open the opening at the distal end of the tubular body when the distal end of the tubular body penetrates the blocking member, and opens to the peripheral wall of the conventional tubular body. It is possible to prevent the opening of the tubular body from being insufficiently opened as compared with the case where the cylindrical member opens and closes the side hole.
And when the luer taper part, such as a syringe and a tube, is extracted from the said outer cylinder, a closure member advances by the urging | biasing force of the said urging means. As a result, the tube body is removed from the insertion hole of the closing member, and the insertion hole is elastically closed by the elasticity, and the opening of the tube body is closed by the closing member.
By the way, the tube body has its distal end opened in the axial direction, and the insertion hole is formed at the distal end of the closing member that closes the opening portion so as to face the opening of the tubular body. For this reason, when a chemical solution or the like flowing through the opening of the tubular body hits the insertion hole, there is a possibility that the chemical solution or the like leaks to the outside of the closing member by breaking the state where the insertion hole is closed due to its elasticity. is there.
Therefore, in the present invention, the fastening means is provided, and the insertion hole is fastened in the closing direction by the fastening means. Accordingly, even if the insertion hole is formed so as to face the opening of the tubular body, leakage of the chemical solution or the like from the insertion hole can be reliably prevented.

In addition, the closing member includes a plug portion that includes the insertion hole and is detachably fitted to the connection portion of the outer cylinder, and is connected to a rear end of the plug portion so that a liquid is provided on an outer peripheral wall of the tube body. By providing a cylindrical tube tightly contacting portion that closely adheres, it is possible to prevent the intrusion of a chemical solution or the like between the tubular body and the tubular tightly contacting portion, and the tubular body and the blocking member inside the outer cylinder It is possible to prevent leakage of chemicals and the like to the outside.
Further, by providing an annular pressure contact member that presses the tubular body contact portion against the tubular body on the outer periphery of the tubular body contact portion, the degree of contact between the thick portion and the tubular body can be increased moderately. It is possible to reliably prevent the penetration of a chemical solution or the like between the tube body and the tube body contact portion.

As the fastening means in the present invention, a convex portion that presses against the outer periphery of the closing member when the closing member closes the connecting portion is provided on the entire inner wall of the connecting portion of the outer cylinder, and the convex portion is tightened. It can be.

At this time, it is preferable that a plurality of annular thick portions and a plurality of annular thin portions are alternately formed in the axial direction in the tubular body contact portion. As a result, the tube-contacting portion can only prevent the leakage of the chemical solution to the outside of the tube and the closing member inside the outer cylinder by bringing the thick portion into close contact with the outer peripheral wall of the tube. In addition, since the contact area between the tube body contact portion and the tube body is reduced and the sliding resistance is relatively small, the closing member can be smoothly moved along the tube body.

As one aspect of the biasing means in the present invention, a coil spring is provided between the bottom of the outer cylinder and the closing member inside the outer cylinder, and the coil spring is used as the biasing means. Can be mentioned. By adopting a coil spring as the urging means, a sufficient urging force can be obtained simply by positioning the coil spring on the outer periphery of the tube and storing the coil spring in the outer cylinder.

Further, the second aspect of the joint device of the present invention includes a bottomed cylindrical outer cylinder provided with a connecting portion that opens to be connectable by inserting a cylindrical connected object, and an axis of the outer cylinder. The rear end communicates with the outside of the bottom portion of the outer cylinder, and the front 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 hollow tube body, a closing member made of an elastic material that is housed in the outer cylinder so as to be able to advance and retreat in the axial direction, and closes the outer cylinder and the tube body at an advanced position, and a tip of the tube body in the closing member An insertion hole through which the tubular body is inserted in accordance with the retraction of the closing member, a tightening means for tightening from the outer periphery of the closing member in a direction to close the insertion hole, and the tubular body through the insertion hole. When pierced, the urging member that urges the closing member retracted along the tubular body in the forward direction The biasing means is formed in a substantially conical cylinder shape integrally connected to the rear end of the closing member and gradually spaced from the pipe body toward the rear end of the pipe body. A skirt portion, and a rear end of the skirt portion is brought into contact with a bottom portion in the outer cylinder in an unfixed state, and the skirt portion is bent when the closing member is retracted along the tubular body, and a small diameter side thereof is When the small-diameter side of the skirt portion is housed inside the large-diameter side between the outer peripheral surface of the skirt portion and the inner peripheral surface of the outer cylinder, There is provided a gap that allows the skirt portion to expand and deform in the storage position over the entire circumference, and the cylindrical member is given a biasing force by the restoring elasticity of the skirt portion.

According to the second aspect of the joint device of the present invention, the same effect as in the first aspect can be obtained, and further, since the skirt portion is provided integrally with the closing member, the number of parts can be reduced. Assembling efficiency can be improved.
Further, when the skirt portion is compressed as the closing member is retracted, the skirt portion is bent and the small diameter side is housed inside the large diameter side, thereby generating a biasing force due to restoring elasticity. .

At this time, it is preferable that a plurality of annular thick portions and a plurality of annular thin portions are alternately formed in the axial direction in the skirt portion. According to this, when the skirt portion is compressed, not only can the skirt portion be bent smoothly through the annular thin portion, but the skirt portion can be bent uniformly over the entire circumference thereof, A stable urging force can be generated.

Further, at this time, a ring member that is tightened from the outer periphery of the closing member in the direction of closing the insertion hole is attached to the outer periphery of the closing member, and the ring member can be used as a tightening means.

Further, a third aspect of the joint device of the present invention includes a bottomed cylindrical outer cylinder provided with a connecting portion that opens to be connectable by inserting a cylindrical connected object, and an axis of the outer cylinder. The rear end communicates with the outside of the bottom portion of the outer cylinder, and the front 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 hollow tube body, a closing member made of an elastic material that is housed in the outer cylinder so as to be able to advance and retreat in the axial direction, and closes the outer cylinder and the tube body at an advanced position, and a tip of the tube body in the closing member An insertion hole through which the tubular body is inserted in accordance with the retraction of the closing member, a tightening means for tightening from the outer periphery of the closing member in a direction to close the insertion hole, and the tubular body through the insertion hole. When pierced, the urging member that urges the closing member retracted along the tubular body in the forward direction The plug member includes a plug portion that includes the insertion hole and is detachably fitted to the connection portion of the outer cylinder, and the tube body that is connected to the rear end of the plug portion. A cylindrical tube contact portion that is liquid-tightly attached to the outer peripheral wall of the tube, and a gap is formed between the rear end of the tube contact portion and the bottom of the outer cylinder, and the biasing means The outer diameter of the tube is gradually increased from the rear end position of the tube contact portion when the plug is fitted to the connecting portion of the outer tube toward the bottom of the outer tube. The tubular member is constituted by a taper member and the tubular body contact portion, and when the closing member is retracted along the tubular body, the tubular body contact portion is slid toward the large diameter side of the tapered member to expand the diameter. An urging force is applied to the closing member by a restoring elasticity in the reduced diameter direction of the contact portion .

According to the second aspect of the joint device of the present invention, the same effects as in the first and second aspects can be obtained, and the tubular body contact portion can be slid toward the large-diameter side of the tapered member. Since it is possible to generate an urging force due to the restoring elasticity of the tube contact portion, and it is only necessary that the tube contact portion has a length that can slide along the taper member, the joint device can be made compact. Can be configured.

At this time, it is preferable that a plurality of annular thick portions and a plurality of annular thin portions are alternately formed in the axial direction in the tubular body contact portion. As a result, the tube-contacting portion can only prevent the leakage of the chemical solution to the outside of the tube and the closing member inside the outer cylinder by bringing the thick portion into close contact with the outer peripheral wall of the tube. In addition, since the contact area between the tube body contact portion and the tube body is reduced and the sliding resistance is relatively small, the closing member can be smoothly moved along the tube body.

Further, at this time, a ring member that is tightened from the outer periphery of the closing member in the direction of closing the insertion hole is attached to the outer periphery of the closing member, and the ring member can be used as a tightening means.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory cross-sectional view showing the joint device of the first embodiment, FIG. 2 is an explanatory cross-sectional view showing a connection state of the joint device of FIG. 1, and FIG. 3 is another pipe body used in the first embodiment. 4 is an explanatory cross-sectional view showing the joint device of the second embodiment, FIG. 5 is an explanatory cross-sectional view showing a connection state of the joint device of FIG. 4, and FIG. FIG. 7 is an explanatory cross-sectional view showing the connection state of the joint device of FIG. 6, FIG. 8 is an explanatory cross-sectional view showing the joint device of the fourth embodiment, and FIG. 9 is an explanatory sectional view showing a connection state of the joint device of FIG.

  The joint device 1 according to the first embodiment of the present invention is provided in one port 3 of a three-way cock 2 as shown in FIG. A rod-like tube 5 made of metal (for example, stainless steel) or hard synthetic resin (for example, polyacetal) is inserted into the port 3 through a tubular tube support 4. The pipe body 5 is formed in a pipe shape, and the base end communicates with the port 3. An opening 6 that opens in the axial direction is formed at the tip of the tubular body 5.

  An outer cylinder 8 is connected and supported on the outer periphery of the tubular body support 4 via a cylindrical outer cylinder support 7. A connecting portion 10 is formed at the distal end of the outer cylinder 8 to insert and connect a luer taper portion 9 (see FIG. 2) which is a connected object provided at the distal end of a syringe or tube (not shown).

  As shown in FIG. 1, a rubber closing member 11 is accommodated in the outer cylinder 8. The closing member 11 is provided so as to be able to advance and retract along the tube body 5 and is urged in the forward direction by a coil spring 12 as urging means provided in the outer cylinder 8. The closing member 11 is prevented from coming off by a flange portion 14 of a press-contact member 13, which will be described later, mounted on the outer periphery of the closing member 11 abutting against a restricting portion 15 protruding from the inner periphery of the connecting portion 10 of the outer cylinder 8. .

  As shown in FIG. 1, the closing member 11 includes a plug portion 16 that closes the distal end side of the tube body 5, and a cylindrical tube that is connected to the rear of the plug portion 16 and closely contacts the outer periphery of the tube body 5. It is comprised by the body contact part 17. FIG. An insertion hole 18 through which the tubular body 5 is inserted is formed in the plug portion 16 of the closing member 11. The insertion hole 18 is a closed hole that opens elastically when the tubular body 5 is inserted and is closed by restoring elasticity when the tubular body 5 is not inserted. Moreover, the tubular body contact portion 17 includes a plurality of annular thick portions 19 and a plurality of annular thin portions 20 alternately in the axial direction.

  The connecting portion 10 is formed with an annular convex portion 21 as a fastening means of the present invention. The convex portion 21 includes the restricting portion 15 on one side. The plug portion 16 of the closing member 11 is pressed by the convex portion 21 by being fitted to the connection portion 10, and maintains a reliable closed state of the insertion hole 18.

  The tubular body 5 is formed in a tapered shape whose outer diameter gradually increases toward the rear end. At the rear end portion of the tubular body 5, a flange portion 22 is formed that protrudes in a hook shape and comes into contact with the end edge of the outer cylinder support portion 7. A fixed leg portion 23 that is inserted and fixed between the outer cylinder support portion 7 and the tube body support portion 4 is integrally provided behind the flange portion 22. The flange 22 is a spring seat that contacts the rear end of the coil spring 12, and prevents damage to the outer cylinder support 7 due to contact between the coil spring 12 and the outer cylinder support 7. The tubular body 5 configured in this way has improved bending strength due to the expanded rear end, and can reliably prevent the tubular body 5 from being bent.

  Further, as shown in FIG. 1, a metal pressure contact member 13 is mounted on the outer periphery of the tubular body contact portion 17. The pressure contact member 13 tightens the entire outer periphery of the tube body contact portion 17 and presses the tube body contact portion 17 against the tube body 5 to make contact. Further, the pressure contact member 13 is formed with a flange portion 14 that protrudes like a bowl on the side of the stopper portion 16. The flange portion 14 serves as a spring seat for the coil spring 12 to prevent damage to the closing member 11 due to contact with the rubber closing member 11, and to reliably apply an urging force. The blocking member 11 is prevented from coming out by abutting against a regulating portion 15 provided on the inner periphery of the connecting portion 10. The pressure contact member 13 maintains the liquid tight state between the tube close contact portion 17 and the tube 5, and can reliably prevent liquid leakage when the closing member 11 moves forward and backward.

  According to the joint device 1 having the above configuration, as shown in FIG. 2, when a luer taper portion 9 provided at the tip of a syringe or tube (not shown) is inserted into the connection portion 10 of the outer cylinder 8, the luer taper The closing member 11 pressed by the portion 9 is retracted, the opening 6 of the tube body 5 penetrating the insertion hole 18 is opened, and the luer taper portion 9 and the port 3 of the three-way cock 2 are connected via the tube body 5. Communicate.

  At this time, when the chemical solution is injected from the luer taper portion 9 toward the tube body 5, the chemical solution tends to enter between the closing member 11 and the tube body 5. By being in pressure contact with the tube body 5 by the pressure contact member 13, the intrusion of the chemical liquid between the tube body contact portion 17 and the tube body 5 is prevented. In addition, since the thin-walled portions 20 and the thick-walled portions 19 are alternately arranged in the tubular body contact portion 17, the tubular body 5 and the tubular body 5 are in close contact with the peripheral wall of the tubular body 5 by the thick-walled portions 19. In addition to preventing intrusion of chemicals and the like between the body contact portion 17 and the thin portion 20, the contact area between the tube contact portion 17 and the tube body 5 is reduced to reduce resistance during sliding. It can be made comparatively small, and the movement of the blocking member 11 along the tube body 5 can be performed smoothly.

  Thereafter, when the luer taper portion 9 is pulled out from the connection portion 10 of the outer cylinder 8, the closing member 11 moves forward by the urging force of the coil spring 12, and when the tubular body 5 comes out of the insertion hole 18, the tubular body 5. The opening 7 is closed. Then, when the plug portion 16 of the closing member 11 is fitted to the connection portion 10 and is pressed from the convex portion 21, a chemical solution or the like that flows through the opening 7 at the distal end of the tube body 5 enters the insertion hole 18. Even if it strikes, the leakage of the chemical solution or the like from the insertion hole 18 can be reliably prevented.

  In addition, in 1st Embodiment, although the tubular body 5 formed in the taper shape which an outer diameter expands gradually toward a rear end was employ | adopted, it is not restricted to this, For example, as shown in FIG. In addition, a pipe-like tube body 24 having the same diameter over the entire length may be employed.

  Next, a second embodiment of the present invention will be described. As shown in FIG. 4, the joint device 25 according to the second embodiment of the present invention is provided in one port 3 of the three-way cock 2 as in the first embodiment described above. In addition, about the structure similar to 1st Embodiment mentioned above, in FIG.4 and FIG.5, the code | symbol same as FIG. 1 thru | or FIG. 3 is attached | subjected, and the description is abbreviate | omitted.

  As shown in FIG. 4, a rubber closing member 26 is attached to the distal end of the tubular body 24 inside the outer cylinder 8. The closing member 26 is provided so as to freely advance and retract along the tube body 24 and is urged in the forward direction by a coil spring 12 provided in the outer cylinder 8. The closing member 26 has a flange portion 27 formed on the outer periphery thereof, and the flange portion 27 is restricted by a restricting portion 15 projecting from the inner periphery of the connecting portion 10 of the outer cylinder 8 and is prevented from coming off.

  As shown in FIG. 4, the closing member 26 includes a plug portion 28 that closes the distal end side of the tube body 24, and a cylindrical tube that is connected to the rear of the plug portion 28 and closely contacts the outer periphery of the tube body 24. It is comprised by the body contact | adherence part 29. FIG. An insertion hole 18 through which the tubular body 24 is inserted is formed in the plug portion 28 of the closing member 26. The insertion hole 18 is a closed hole that opens elastically when the tube body 24 is inserted and is closed by restoring elasticity when the tube body 24 is not inserted.

  A metal ring member 30 is fitted on the outer periphery of the plug portion 28. The ring member 30 is positioned on the outer periphery of the tube contact portion 29 and the tightening portion 31 as the tightening means of the present invention for tightening the plug portion 28 in the direction in which the insertion hole 18 is closed. A pressing portion 32 that presses against the body 24 is provided. The tightening portion 31 reliably prevents leakage of the chemical solution or the like from the insertion hole 18 to the outside even when the chemical solution or the like flowing through the opening 6 at the tip of the tubular body 24 hits the insertion hole 18. be able to. In addition, the pressing portion 32 maintains the watertight state of the tubular body contact portion 29 and the tubular body 24, and can reliably prevent liquid leakage when the closing member 26 moves forward and backward. Further, the connecting portion 10 of the outer cylinder 8 is formed with an annular convex portion 21 projecting to the inner peripheral side thereof, so that the distal end portion of the plug portion 28 is pressed to more reliably close the insertion hole 18. It has become.

  As shown in FIG. 5, when a luer taper portion 9 provided at the tip of a syringe or tube (not shown) is inserted into the connection portion 10 of the outer cylinder 8, the closing member 26 pressed by the luer taper portion 9 is Retracting, the opening 6 of the tube body 24 penetrating the insertion hole 18 is opened, and the luer taper portion 9 and the port 3 of the three-way cock 2 communicate with each other via the tube body 24. Thus, since the opening 6 of the tube body 24 is reliably opened when the tube body 24 penetrates the insertion hole 18, the closing member 26 can make the retreat distance relatively short, and the overall compact. Can be configured. Thereafter, when the luer taper portion 9 is pulled out from the connecting portion 10 of the outer cylinder 8, the closing member 26 is advanced by the urging force of the coil spring 12, and when the tubular body 24 comes out of the insertion hole 18, the tubular body 24 is removed. The opening 6 is closed. As described above, since the forward distance of the closing member 26 is relatively short and the opening 6 of the tubular body 24 is quickly closed, liquid leakage or the like when the luer taper portion 9 is extracted can be extremely reduced.

  Next, a third embodiment of the present invention will be described. As shown in FIGS. 6 and 7, the joint device 33 according to the third embodiment is provided in one port 3 of the three-way cock 2 as in the first embodiment described above. The same configurations as those of the first embodiment described above are denoted by the same reference numerals in FIGS. 6 and 7 as in FIGS.

  In the third embodiment of the present invention, as shown in FIGS. 6 and 7, a skirt portion 35 is connected to the closing member 34. That is, the closing member 34 includes a plug portion 36 that closes the distal end side of the tube body 24, and a cylindrical tube body contact portion 37 that is connected to the rear of the plug portion 36 and closely contacts the outer periphery of the tube body 24. In addition, a skirt portion 35 extending in the rear end direction of the tube body 24 is provided at the rear end of the tube body contact portion 37. As will be described later, the skirt portion 35 is compressed when the plug portion 36 and the tube body contact portion 37 are retracted along the tube body 24, and applies a biasing force due to restoring elasticity to the plug portion 36.

  A rubber ring member 38 is fitted on the outer periphery of the plug portion 36. The ring member 38 is a fastening means of the present invention, and fastens the plug portion 36 in the direction in which the insertion hole 18 is closed. By tightening the ring member 38, even if a chemical solution or the like flowing through the opening 6 at the tip of the tube body 24 hits the insertion hole 18, the leakage of the chemical solution or the like from the insertion hole 18 to the outside is ensured. Can be prevented.

  As shown in FIG. 6, the skirt portion 35 is formed in a substantially conical cylinder shape that gradually separates from the tube body 24 toward the rear end of the tube body 24. The skirt portion 35 is formed in a shape in which a plurality of annular thin portions 39 and a plurality of annular thick portions 40 are alternately arranged. By providing each thin portion 39, the skirt portion 35 can be bent.

  As shown in FIG. 7, when a luer taper portion 9 provided at the tip of a syringe or tube (not shown) is inserted into the connection portion 10 of the outer cylinder 8, the plug portion 36 pressed by the luer taper portion 9 and The tubular body contact portion 37 is retracted, the opening 6 of the tubular body 24 penetrating the insertion hole 18 is opened, and the luer taper portion 9 and the port 3 of the three-way stopcock 2 communicate with each other through the tubular body 24. Further, at this time, the skirt portion 35 is bent through any of the thin portions 39 and the small diameter side is housed inside the large diameter side, and the urging force due to the restoring elasticity of the skirt portion 35 is applied to the plug portion 36 and the tube body. It is applied to the contact portion 37. Thereafter, when the luer taper portion 9 is pulled out from the insertion portion 10 of the outer cylinder 8, the closing portion 23 and the close contact portion 24 are advanced by the urging force of the bent skirt portion 25, and the tubular body 5 comes out of the slit 17. At that point, the slit 17 is closed by the restoring elasticity due to the fact that the closing portion 23 is made of rubber and the elastic tightening force of the ring member 26 made of rubber, so that the opening 6 of the tubular body 5 can be quickly and reliably formed. Obstructed.

  Thus, by providing the skirt portion 35 instead of the coil spring 12 (see FIG. 1), the same urging force as that of the coil spring 12 can be generated, and the skirt portion 35 is integrated with the closing member 34. As a result, the number of parts can be reduced and the assembly efficiency can be improved. Furthermore, since the skirt portion 35 is bent and the overall length during compression can be made relatively short, the space for accommodating the skirt portion 35 inside the outer cylinder 8 can be reduced, and the joint device 33 can be made compact. can do.

  Next, a fourth embodiment of the present invention will be described. As shown in FIGS. 8 and 9, the joint device 41 of the fourth embodiment is provided in one port 3 of the three-way stopcock 2, as in the first and second embodiments described above. ing. The same configurations as those of the first to third embodiments described above are denoted by the same reference numerals in FIGS. 8 and 9 as in FIGS. 1 to 7, and the description thereof is omitted.

  In the fourth embodiment of the present invention, as shown in FIGS. 8 and 9, the closing member 42 is connected to the plug portion 43 that closes the distal end side of the tube body 24 and the rear of the plug portion 43. And a cylindrical contact skirt portion 44 (tube body contact portion) that is in close contact with the outer periphery of the tube body 24.

  Further, a taper member 46 having a taper surface 45 that gradually increases in diameter toward the rear end thereof is extrapolated to the tube body 24. The contact skirt portion 44 can be retracted from the distal end portion of the tubular body 24 while being in sliding contact with the tapered surface 45 of the tapered member 46. The contact skirt portion 44 is formed in a shape in which a plurality of annular thin portions 47 and a plurality of annular thick portions 48 are alternately arranged. Each thick portion 48 forms an annular convex portion on the inner surface of the contact skirt portion 44, and the inner peripheral surface of each thick portion 48 becomes a tapered surface 45 of the taper member 46 when the contact skirt portion 44 is retracted. Since the sliding contact is made, the contact skirt portion 44 can be smoothly retracted with a small sliding resistance.

  As shown in FIG. 9, when a luer taper portion 9 provided at the tip of a syringe or tube (not shown) is inserted into the connection portion 10 of the outer cylinder 8, the plug portion 43 pressed by the luer taper portion 9 is Retracting, the opening 6 of the tube body 24 penetrating the insertion hole 18 is opened, and the luer taper portion 9 and the port 3 of the three-way cock 2 communicate with each other via the tube body 24. Further, at this time, the contact skirt portion 44 is slid toward the large diameter side of the taper member 46 to be expanded in diameter. As a result, in the contact skirt portion 44, restoring elasticity in the diameter reducing direction is generated, and a biasing force is applied to the plug portion 43 by a force that tends to move to the smaller diameter side of the taper member 46.

  Thereafter, when the luer taper portion 9 is pulled out from the connection portion 10 of the outer cylinder 8, the contact skirt portion 44 slides along the taper surface 45 of the taper member 46 to the small diameter side by the restoring force in the diameter reduction direction, The stopper part 43 is advanced. When the tube body 24 is removed from the insertion hole 18, the insertion hole 18 is closed by the restoring elasticity due to the plug portion 43 being made of rubber and the elastic tightening force of the rubber ring member 38. The opening 6 of the tube body 24 is closed quickly and reliably.

  As described above, the urging force similar to that of the coil spring 12 can be generated also by providing the contact skirt portion 44 instead of the coil spring 12 (see FIG. 1).

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory sectional drawing which shows the coupling apparatus of the 1st Embodiment of this invention. Explanatory sectional drawing which shows the connection state of the coupling apparatus of FIG. Explanatory sectional drawing which shows the other example of the tubular body used for 1st Embodiment. Explanatory sectional drawing which shows the coupling apparatus of the 2nd Embodiment of this invention. Explanatory sectional drawing which shows the connection state of the coupling apparatus of FIG. Explanatory sectional drawing which shows the coupling apparatus of the 3rd Embodiment of this invention. Explanatory sectional drawing which shows the connection state of the coupling apparatus of FIG. Explanatory sectional drawing which shows the coupling apparatus of the 4th Embodiment of this invention. Explanatory sectional drawing which shows the connection state of the coupling apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,25,33,41 ... Joint device, 5,24 ... Tube, 8 ... Outer tube, 9 ... Luer taper part (connected object), 10 ... Connection part, 11, 26, 34, 42 ... Closure member, 12 ... Coil spring (biasing means), 13 ... Pressure contact member, 16, 28, 36, 43 ... Plug part, 17, 29, 37 ... Tube contact part, 18 ... Insertion hole, 19, 40, 48 ... Thick part , 20, 39, 47 ... thin part, 21 ... convex part (clamping means), 31 ... clamping part (clamping means), 32 ... pressing part (pressure contact member) 35 ... skirt part (biasing means), 38 ... ring Member (clamping means), 46 ... taper member (taper part), 44 ... adhesion skirt part (biasing means / tube body adhesion part).

Claims (10)

A cylindrical outer cylinder with a bottom provided with a connecting portion that opens to be connectable by inserting a cylindrical connection object;
Extending along the axis of the outer cylinder, the rear end communicates with the outside of the bottom of the outer cylinder, and the front end is located within the outer cylinder at a predetermined distance from the connecting portion and is connected to the connecting portion. A hollow tube opening in the axial direction.
A closing member made of an elastic material that is housed in the outer cylinder so as to be movable back and forth in the axial direction and closes the outer cylinder and the pipe body at the forward position;
An insertion hole through which the tubular body is inserted as the closing member is retracted at a position facing the tip of the tubular body in the closing member ;
When the front Symbol tube penetrates the insertion hole, it includes a biasing means for biasing the closure member which is retracted along the tube body in the forward direction,
The closing member is provided with the insertion hole and is detachably fitted to the connection portion of the outer cylinder, and is connected to the rear end of the plug portion so as to be liquid-tight on the outer peripheral wall of the tubular body. A cylindrical tubular body contact portion that closely contacts ,
When the plug portion is fitted to the connecting portion of the outer cylinder, a fastening means is provided for tightening from the outer periphery of the plug portion in a direction to close the insertion hole ,
An annular shape that presses and contacts the tubular body contact portion with the tubular body when the plug portion is fitted to the connecting portion of the outer cylinder and when the closing member moves forward and backward. A joint device comprising a pressure contact member . The tightening means is a convex portion that protrudes from the entire inner wall of the connection portion of the outer cylinder and presses against the outer periphery of the closing member when the closing member closes the connection portion. The joint device according to 1. 3. The joint device according to claim 1, wherein the tubular body contact portion has a plurality of annular thick portions and a plurality of annular thin portions formed alternately in the axial direction . The joint device according to any one of claims 1 to 3, wherein the biasing means is a coil spring provided between the bottom of the outer cylinder and the closing member inside the outer cylinder. . A cylindrical outer cylinder with a bottom provided with a connecting portion that opens to be connectable by inserting a cylindrical connection object;
Extending along the axis of the outer cylinder, the rear end communicates with the outside of the bottom of the outer cylinder, and the front end is located within the outer cylinder at a predetermined distance from the connecting portion and is connected to the connecting portion. A hollow tube opening in the axial direction.
A closing member made of an elastic material that is housed in the outer cylinder so as to be movable back and forth in the axial direction and closes the outer cylinder and the pipe body at the forward position;
An insertion hole through which the tubular body is inserted as the closing member is retracted at a position facing the tip of the tubular body in the closing member;
Tightening means for tightening from the outer periphery of the closing member in the direction of closing the insertion hole;
An urging means for urging the closing member retracted along the tubular body in the forward direction when the tubular body penetrates the insertion hole ;
The biasing means is a skirt portion formed in a substantially conical cylinder shape integrally connected to the rear end of the closing member and gradually spaced from the pipe body toward the rear end of the pipe body,
The rear end of the skirt portion is in contact with the bottom portion of the outer cylinder in a non-fixed state, and the skirt portion is bent when the closing member is retracted along the tubular body, and the smaller diameter side is the inner diameter side. Stored in the direction
Between the outer peripheral surface of the skirt portion and the inner peripheral surface of the outer cylinder, when the small-diameter side of the skirt portion is stored inward of the large-diameter side, the skirt portion undergoes a diameter expansion deformation at the storage position. There is an air gap that is allowed around the entire circumference .
The tubular member is provided with a biasing force by the restoring elasticity of the skirt portion . 6. The skirt portion is formed such that a plurality of annular thick portions and a plurality of annular thin portions are alternately formed in the axial direction, and can be bent by any of the thin portions. The coupling device as described . The joint device according to claim 5 or 6, wherein the tightening means is a ring member that is attached to the outer periphery of the closing member and tightens from the outer periphery of the closing member in a direction to close the insertion hole . A cylindrical outer cylinder with a bottom provided with a connecting portion that opens to be connectable by inserting a cylindrical connection object;
Extending along the axis of the outer cylinder, the rear end communicates with the outside of the bottom of the outer cylinder, and the front end is located within the outer cylinder at a predetermined distance from the connecting portion and is connected to the connecting portion. A hollow tube opening in the axial direction.
A closing member made of an elastic material that is housed in the outer cylinder so as to be movable back and forth in the axial direction and closes the outer cylinder and the pipe body at the forward position;
An insertion hole through which the tubular body is inserted as the closing member is retracted at a position facing the tip of the tubular body in the closing member;
Tightening means for tightening from the outer periphery of the closing member in the direction of closing the insertion hole;
An urging means for urging the closing member retracted along the tubular body in the forward direction when the tubular body penetrates the insertion hole ;
The closing member is provided with the insertion hole and is detachably fitted to the connection portion of the outer cylinder, and is connected to the rear end of the plug portion so as to be liquid-tight on the outer peripheral wall of the tubular body. A cylindrical tube-contacting portion that is in close contact, and a gap is formed between the rear end of the tube-contacting portion and the bottom of the outer cylinder,
The urging means is provided on the outer periphery of the tubular body, and extends from the rear end position of the tubular body contact portion when the plug portion is fitted to the connecting portion of the outer tube toward the bottom of the outer tube. A tapered member that gradually expands in diameter, and the tubular body contact portion,
When the closing member is retracted along the tube, the tube contact portion slides toward the larger diameter side of the taper member and is expanded in diameter, and the biasing force is applied by the restoring elasticity of the tube contact portion in the reduced diameter direction. A joint device applied to the closing member . The tubular body contact portion is characterized in that a plurality of annular thick portions and a plurality of annular thin portions are alternately formed in the axial direction, and the thick portions contact the outer surface of the taper member when retreating. Item 9. The joint device according to Item 8 . The joint device according to claim 8 or 9, wherein the tightening means is a ring member that is attached to the outer periphery of the closing member and tightens from the outer periphery of the closing member in a direction to close the insertion hole .

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