JP2006136479A - Pair of tube for liquid transporting passage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pair of tubes for liquid transporting passages which are hard to disengage even if two engaged tubes are mutually twisted in the opposite directions. <P>SOLUTION: The pair of tubes for liquid transporting passages are a pair of tubes 90 used by connecting the pair of tubes in a liquid transporting passage for transporting blood or a medical solution. A pressing ring 300 with a nail part 307 is inserted and fit in a tube 200, and the tube 200 has a diameter expanding portion 202 which expands an inner diameter at an end part. A male joint part 100 has a step part 102 fit in the nail part 307 and a first tapered part 103 reducing the outer diameter at an end part. The pressing ring 300 is constituted to have the nail part 307 fit in the step part 102 by sliding the pressing ring 300 to the side of the male joint part 100 with the inner surface of the diameter expanding portion 202 abutted on the outer surface of the first tapered part 103, and has a first tapered part 303 for attaching the diameter expanding part 202 to the first tapered part 103 with pressure by pressing the outer surface of the diameter expanding part 202 while the nail part 307 is fit in the step part 102. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pair of pipes connected on a transport path communicating with a living body, and more particularly to a technique for improving the wearability of both pipes.

  In the case of conduits (lines) used for transfusion of medicinal liquids, blood transfusions, or extracorporeal blood circulation during surgery, for example, a hard tube is used on the upstream side connected to a medical device. As in the case of using a soft pipe on the downstream side, the shape and characteristics of the conduit may be different on the upstream side and downstream side of the conduit. In such cases, the shape and characteristics are different. Two pipes are joined and used.

Currently, a technique established as a method for joining a medical device tube and a component is generally joined by an adhesive or by welding. In addition, there is a method using a so-called connector called a connector.
The above-mentioned connectors are roughly classified into two types, and one is called a slip-type connector, and a friction is caused by inserting a second tube having a reduced diameter into the first tube having a diameter expanded at the tip. Engagement is maintained by force.

The other is a so-called lock-type connector in which a member for increasing the degree of engagement of two pipes is added to the slip-type connector, and a lock nut is inserted into the first pipe. A screw portion that is screwed with the lock nut is disposed on the outer periphery of the second tube tip portion, and the lock nut and the screw portion are screwed after the second tube is inserted and engaged with the first tube. Thus, the relative position between the first tube and the second tube is fixed. (For example, Patent Document 1)
Thus, by using the lock-type connector, the engagement of the two pipes can be reliably held as compared with the case of using the slip-type connector.
Registered Utility Model Publication No. 3039172

However, in the bonding method by bonding, the objects to be bonded are limited to materials that can be bonded, and in the bonding method by welding, the materials to be welded are limited to the same or close to each other.
For example, adhesives are used to join vinyl chloride (PVC) tubes, and when joining elastomeric tubes, thermal welding is common, but PVC tubes and polypropylene (PP), etc. In the case of a material that is difficult to adhere with an adhesive due to the property of the material being difficult to adhere to the surface, it is difficult to adhere and weld to a different material such as a PVC tube.

On the other hand, when a lock-type connector is used, it is possible to join regardless of the material to be joined. However, when the first pipe and the second pipe are twisted in the opposite directions, the torsion follows. It is also conceivable that the lock nut rotates, the engagement between the lock nut and the screw portion is released, and the engagement between the first pipe and the second pipe is released.
Considering the peculiarity that such a phenomenon is unlikely to be used in the medical field, even if the two engaged tubes are twisted in opposite directions, the engagement is released. There is a need for an improvement that can eliminate the fear of the loss.

  The present invention has been made in view of the above problems, and its purpose is to join regardless of the material of the pipes to be joined, and the two pipes to be engaged are opposite to each other. Even when the pipe pair for carrying liquid that is not easily disengaged and the two pipes to be engaged are twisted in the opposite directions to each other, the carrying liquid that is difficult to be disengaged It is in providing the connection method of a pipe.

  In order to achieve the above-mentioned object, the pipe pair for carrying liquid according to the present invention is a pair of pipes used in connection with a carrying liquid passage for conveying body fluid, blood or chemical liquid, and the first pipe is a nail. The second tube has a fitting portion that fits into the claw portion and has an outer diameter at the end portion. The stop member has a reduced diameter portion, and the stopper member slides to the second tube side in a state where the inner surface of the enlarged diameter portion is in contact with the outer surface of the reduced diameter portion, whereby the claw portion is It is configured to be fitted to a fitting portion, and has a pressing portion that presses the outer surface of the enlarged diameter portion in a fitted state and presses the enlarged diameter portion to the reduced diameter portion. To do.

  Moreover, in order to achieve the said objective, the connection method of 2 pipe | tubes used on the conveyance path which is connected to the biological body which concerns on this invention WHEREIN: A method of connecting, having a first member having a diameter-enlarged portion whose inner diameter is enlarged at an end portion, and a fitting portion fitted to the claw portion, while inserting and fitting a stopper member having a claw portion. With the second pipe having a reduced diameter part whose outer diameter is reduced at the end, the stopper member is placed on the second pipe side in a state where the inner surface of the enlarged diameter part is in contact with the outer surface of the reduced diameter part. The claw portion is fitted to the fitting portion by sliding to the fitting portion, and the outer diameter surface of the enlarged diameter portion is pressed in the fitted state to press the enlarged diameter portion to the reduced diameter portion. Features.

  The pipe pair for carrying liquid according to the present invention is a pair of pipes used for connection in a carrying path for conveying body fluid, blood or medical medicinal liquid, and the first pipe has a stopper member having a claw portion inserted therein. The second tube has a fitting portion that fits the claw portion and a reduced diameter portion that reduces the outer diameter at the end portion. The stopper member is slid to the second tube side in a state where the inner surface of the enlarged diameter portion is in contact with the outer surface of the reduced diameter portion, so that the claw portion is fitted to the fitting portion. And a pressing portion that presses the outer surface of the enlarged diameter portion in a fitted state and presses the enlarged diameter portion against the reduced diameter portion.

  Moreover, the pipe connection method for carrying liquid according to the present invention is a method for connecting two pipes used on a carrying liquid path for conveying body fluid, blood or medical medicinal liquid, and a stopper member having a claw portion is inserted. In addition, the second tube has a first pipe having an enlarged diameter portion whose inner diameter is enlarged at the end portion, a fitting portion fitted to the claw portion, and a reduced diameter portion whose outer diameter is reduced at the end portion. The claw portion is fitted into the fitting portion by sliding the stopper member toward the second tube side in a state where the outer surface of the reduced diameter portion is in contact with the inner surface of the enlarged diameter portion. And the outer diameter surface of the enlarged diameter portion is pressed in the fitted state to press the enlarged diameter portion against the reduced diameter portion.

For this reason, since a nail | claw part and a fitting part fit by sliding a stop member to the fitting part side, relative rotation of a stop member and a fitting part does not contribute to fitting. Even if the stopper member and the fitting portion are rotated relative to each other, the fitting between the claw portion and the fitting portion is not released.
Further, when fitting, the stopper member presses the outer surface of the enlarged diameter portion, and the enlarged diameter portion and the reduced diameter portion are pressure-bonded, so that the liquid tightness is lost even if the rotation occurs. hard.

Further, since the two pipes are joined by a physical method, the joining quality is hardly affected by the material of the two pipes.
Further, since no adhesive is used for joining the two pipes, when the joining is performed using a production robot, it is not necessary to replenish the adhesive and the maintenance is improved.
Moreover, it is desirable that the enlarged diameter portion is sandwiched between the reduced diameter portion and the stopper member.

As a result, even if the material of the first tube is a soft material that is difficult to stabilize in shape, the material is supported from both sides of the inner surface and the outer surface, so that liquid tightness is easily ensured.
Further, it is desirable that at least one of the contact surfaces of the reduced diameter portion and the stop member with the enlarged diameter portion is subjected to a shape process for increasing the degree of liquid tightness.
Thereby, liquid-tight performance is improved.

Moreover, it is desirable that the shape processing for increasing the degree of liquid tightness is performed on each of the contact surfaces of the reduced diameter portion and the enlarged diameter portion of the stopper member.
Thereby, liquid-tight performance is further improved.
Moreover, it is desirable that the portion to be subjected to the shape processing is annular.
Thereby, since the site | part which prevents a liquid leak is comprised by the said ring as a boundary, the liquid distribution between the 2 area | regions divided by the said ring can be suppressed.

The shape that increases the degree of liquid tightness may be a convex portion that goes around in the circumferential direction.
Usually, since the first pipe and the second pipe are resin molded products, it is easy to form a convex portion that makes a round in the circumferential direction, and since there is little increase in cost, the liquid-tight performance can be easily achieved at low cost. Is further improved.
Further, in the fitting state, the claw portion receives a pressing force that deforms outward from the contact portion in the fitting portion, and in the contact portion of either the claw portion or the fitting portion, It is desirable that a slope that converts a part of the pressing force or a reaction force of the pressing force into a force acting in a direction to reduce the distance between the stopper member and the second pipe is formed.

As a result, the force that reduces the distance between the stopper member and the second pipe works continuously due to the pressing force that acts in the fitted state, and the occurrence of looseness is prevented, thereby further improving the liquid tightness performance.
Moreover, in the said fitting state, it is desirable that the mutually opposing surfaces of the said enlarged diameter part and the said reduced diameter part are parallel.

Thereby, the mutually opposing surfaces of the said enlarged diameter part and the said reduced diameter part become easy to closely_contact | adhere, and liquid-tightness improves.
Further, the distal end portion of the second tube has a tapered shape that tapers, and the distal end portion has a large-diameter portion that has an outer diameter equal to or larger than the inner diameter of the first tube at least in part. In the fitted state, it is desirable that the first pipe is inserted into the large diameter portion.

  By inserting the first tube up to the large diameter portion, the frictional force increases, and the first tube is more difficult to be removed from the second tube.

(Embodiment)
(Constitution)
FIG. 1 is a partial cross-sectional view of a carrying liquid pipe pair in the present embodiment.
The carrying liquid pipe pair 90 is a pair of pipes used in connection with a carrying liquid path for transporting body fluid, blood, or a chemical solution, and is inserted into the pressing ring 300 as an example of a stopper member. The male joint portion 100 is an example of a first pipe whose outer diameter is reduced at the end, and the tube 200 is an example of a second pipe whose inner diameter is enlarged.

The male joint portion 100 is a rigid tube made of, for example, hard resin, and has a constant diameter larger than that of the long tube portion 101 at one end of the long tube portion 101 having a substantially constant tube diameter d ₀ and wall thickness. a step portion 102 of d ₁ is arranged, and a _first angle having an inclination angle θ ₁ that decreases in diameter from the other end of the step portion 102, that is, from the end not adjacent to the long tube portion 101 toward the distal end portion side. A taper portion 103 is extended, and a second taper portion 105 having an inclination angle θ ₂ is further extended from the tip end of the first taper portion 103 so that the diameter decreases toward the tip end side.

Further, an endless protrusion 104 is disposed in the circumferential direction at the center of the outer peripheral surface of the first taper portion 103.
Here, the inclination angle θ ₁ and the inclination angle θ ₂ are angles formed with the tube axis direction and have a relationship of θ ₁ > θ ₂ .
The tube 200 is a tube made of, for example, a soft resin. The tube 200 has a flare process, that is, an expanded diameter portion 202 that is expanded, at one end of a long tube portion 201 having a substantially constant tube diameter and wall thickness. It is arranged.

The pressing ring 300 is made of, for example, elastic hard resin or the like, and as shown in FIG. 2, as shown in FIG. The nail | claw part 307 is extended.
The main body portion 301 has a through hole 302 having a slightly larger inner diameter than the outer diameter of the tube 200 on the bottom surface, and a first taper having an inclination angle θ ₁ on the inner peripheral surface on the way from the bottom surface to the claw portion 307 side. A unit 303 is arranged.

In addition, a second taper portion 306 having an inclination angle θ ₃ is disposed inside the claw portion 307 along the boundary with the main body portion 301.
The inclination angle θ ₃ is an angle formed with the tube axis direction, similar to the inclination angle θ ₁ .
Here, when the minimum diameter of the tapered portion 306 in the natural state is d ₂ and the maximum diameter is d ₃ , the diameter d ₀ , the diameter d ₁ , the diameter d _2, and the diameter d ₃ are d ₃ > d ₂ , d ₂ ≧ d ₀ , and d ₁ ≈d ₃ are set.

Here, as an example of the values of these diameters, d ₁ = 9.4 (mm), d ₃ = 9.5 (mm), d ₂ = 8.5 (mm), d ₀ = 8 (mm) It becomes.
Since the claw portion 307 has elasticity, it is bent when a force is applied outward, and the values of the diameter d ₂ and the diameter d ₃ increase. When this external force disappears, the restoring force restores to the natural state diameter.
The purpose of setting the values of the diameter d ₀ , the diameter d ₁ , the diameter d _2, and the diameter d ₃ to the above-described relationship is that the claw portion 307 gets over the stepped portion 102 and the stepped portion 102 and the long tube portion 101 In the state of slipping from the boundary, that is, from the level difference (hereinafter referred to as “when engaged”), the looseness causes the fitting force between the male joint portion 100 and the tube 200 to weaken, and the liquid tightness is at an allowable level. This is in order not to fall below.

That is, when the contact between the peripheral edge of the stepped portion 102 and the surface of the tapered portion 306 is maintained during the above-described engagement, the restoring force of the claw portion 307 works and constantly presses the tapered portion 306 outward. Since the restoring force is applied to the contact surface of 306 from an oblique direction, the restoring force is decomposed into a force in a different direction, that is, divided.
The above component force acts as a biasing force, that is, a biasing force so as to reduce the distance between the pressing ring 300 and the male joint portion 100 in the tube axis direction. It is sandwiched between the first taper part 303 and the first taper part 103 of the male joint part 100.

At this time, as shown in FIG. 3, the male joint portion 100, the tube 200, and the pressing ring 300 are in contact with the tapered portion 306 at the boundary between the stepped portion 102 and the long tube portion 101, respectively, during the above-described engagement. Thus, the dimension in the tube axis direction is set.
In addition, a line-shaped endless protrusion 304 disposed in the circumferential direction on the inner peripheral surface of the first taper portion 303 and a line-shaped endless protrusion disposed in the circumferential direction on the outer peripheral surface of the first taper portion 103. By 104, the cross section of the pinched expanded diameter portion 202 is further compressed locally, the pressing force of the A portion is increased, and the liquid tightness is enhanced.

The fitting of the pressing ring 300 to the male joint portion 100 can be performed only by moving the pressing ring 300 on the tube axis in a direction approaching the male joint portion 100.
That is, in the present liquid carrying pipe pair, it is not necessary to rotate the pressing ring 300 at the time of fitting so that the conventional lock connector is engaged by screwing.
Even if the pressing ring 300 rotates in the circumferential direction for some reason, as shown in FIG. 3, since the cross-sectional shape is continuously formed in the circumferential direction, the frictional force between the pressing ring 300 and the tube 200. The tube 200 is difficult to rotate following the rotation of the pressing ring 300.

Even if the tube 200 rotates, the distance between the pressure ring 300 and the male joint portion 100 does not change, so that liquid tightness can be easily maintained, and the engagement between the male joint portion 100 and the tube 200 is released. There is nothing to do.
In the present embodiment, the inclination angles of the first tapered portion 103, the enlarged diameter portion 202, and the first tapered portion 303 are all the same θ ₁ , that is, the same, but when the tube 200 is soft, Since the enlarged diameter portion 202 sandwiched between the first taper portion 303 and the first taper portion 103 is easily deformed by the application of an external force, the first taper portion is within a range in which liquid tightness can be secured. The interval between the 303 and the first taper portion 103 does not need to be constant, and the inclination angles of the diameter-enlarged portion 202 and the first taper portion 303 do not need to coincide completely.

  Further, in the present embodiment, the second taper portion 306 is provided on the claw portion 307 of the press ring 300 to generate a component force that biases the distance between the press ring 300 and the male joint portion 100. However, instead of doing this, the second taper portion 306 of the pressure ring 300 is set to a right-angled step or a step at an angle close thereto, and the periphery of the step portion that is one end of the step portion 102 of the male joint portion 100 is tapered. It may be provided.

Moreover, in this Embodiment, the press ring 300 consists of hard resin etc. which have elasticity, for example, and the front-end | tip protruded inward from the edge part of the bottomed cylindrical main-body part 301, as shown in FIG. Although the pair of claw portions 307 having the protruding portions 305 are extended, the number of the claw portions 307 may be three or more.
By providing more claw portions 307, the fitting force can be increased.

  The present invention can be applied to a transport channel pipe used in a medical field where various types of connection ports are used.

It is a fragmentary sectional view of the pipe pair for carrying in this embodiment. It is a perspective view of a press ring in this embodiment. It is a fragmentary sectional view at the time of engagement of a pipe pair for carrying in this embodiment.

Explanation of symbols

90 Pipe-conveying liquid pair 100 Male joint part 101 Long pipe part 102 Step part 103 Tapered part 104 Projection part 105 Taper part 200 Tube 201 Long pipe part 202 Expanded diameter part 300 Press ring 301 Main body part 302 Through hole 303 Taper part 304 Protrusion 305 Projection 306 Taper 307 Claw

Claims (10)

A pair of tubes used for connection in a transport path for transporting bodily fluids, blood or medical medicinal liquids,
The first tube has a diameter-enlarged portion in which an inner diameter is enlarged at an end portion while inserting a stopper member having a claw portion,
The second tube has a fitting portion that fits into the claw portion, and has a reduced diameter portion whose outer diameter decreases at the end portion,
The claw portion is fitted to the fitting portion by sliding to the second tube side in a state where the inner surface of the enlarged diameter portion is in contact with the outer surface of the reduced diameter portion. And a pressing portion that presses the outer surface of the enlarged diameter portion in a fitted state and presses the enlarged diameter portion against the reduced diameter portion.   The said diameter-expanded part is clamped by the said diameter-reduced part and the said stop member, The pipe pair for carrying liquids of Claim 1 characterized by the above-mentioned.   3. The carrier solution according to claim 2, wherein at least one of contact surfaces of the reduced diameter portion and the stop member with the enlarged diameter portion is subjected to shape processing for increasing the degree of liquid tightness. Tube pair.   4. The carrying liquid pipe pair according to claim 3, wherein the shape processing for increasing the degree of liquid tightness is performed on each of the contact surfaces of the reduced diameter portion and the enlarged diameter portion of the stopper member.   5. The pair of pipes for carrying liquid according to claim 4, wherein the portion subjected to the shape processing is annular.   The pipe pair for carrying liquid according to claim 5, wherein the shape that increases the degree of liquid tightness is a convex portion that goes around in the circumferential direction.   In the fitting state, the claw portion receives a pressing force that deforms outward from the contact portion in the fitting portion, and in the contact portion of either the claw portion or the fitting portion, 5. A slope that converts a pressing force or a part of a reaction force of the pressing force into a force that acts in a direction to reduce the distance between the stopper member and the second pipe is formed. The pipe pair for carrying liquid according to any one of the descriptions.   The pipe pair for carrying liquid according to any one of claims 1 to 6, wherein in the fitted state, the mutually facing surfaces of the enlarged diameter portion and the reduced diameter portion are parallel to each other. The tip of the second tube has a tapered shape that tapers,
The distal end portion has a large-diameter portion that has an outer diameter equal to or larger than the inner diameter of the first tube at least in a part thereof,
The pipe pair for carrying liquid according to any one of claims 1 to 6, wherein in the fitted state, the first pipe is inserted up to the large diameter portion. A method of connecting two pipes used on a transport path for transferring body fluid, blood or medical medicinal solution,
A first pipe having a diameter-enlarged portion with an inner diameter enlarged at the end portion, while inserting a stopper member having a claw portion;
A second tube having a fitting portion that fits into the claw portion and having a reduced diameter portion whose outer diameter is reduced at the end portion,
While the outer surface of the reduced diameter portion is in contact with the inner surface of the enlarged diameter portion, the claw portion is fitted to the fitting portion by sliding the stopper member toward the second tube side, In the fitting state, the outer surface of the enlarged diameter portion is pressed to crimp the enlarged diameter portion to the reduced diameter portion.

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