JP5446458B2 - Drip tube - Google Patents

Description

  The present invention relates to a drip tube used with a tube connected thereto.

  A flexible tube is connected to an infusion tube used for an infusion circuit or the like. Conventionally, polyvinyl chloride has been used as a material for the drip tube. However, if the drip tube is canceled at the time of disposal, dioxins may be generated. Therefore, the material is being switched to another plastic or the like. However, the drip tube made of another plastic material has a problem that it cannot be bonded to the tube or has a low bonding strength, and the connection strength is smaller than the conventional one.

  In order to solve the above-mentioned problem, the connecting portion of the drip tube has a double tube structure including an outer tube and an inner tube, and a convex portion that protrudes from the inner surface of the outer tube toward the inner tube is provided. There is known a structure in which an inner tube is pressed (for example, Patent Documents 1 to 4).

JP 2006-181222 A JP 2002-39468 A JP 2001-95927 A JP 2000-354635 A

  However, as described above, in order to provide a convex portion on the outer tube, while maintaining the state where the tube is connected to the drip tube, the connecting portion of the drip tube is processed to form a convex portion, or the convex portion first. After forming the tube, it was necessary to press-fit the tube between the outer tube and the inner tube, and the workability was not good.

  This invention is made | formed in view of such a situation, The objective is not using polyvinyl chloride as a raw material, The connection process with a tube is easy, and the connection strength with a tube is weak. It is to provide a drip tube that does not.

  (1) The present invention is an infusion tube in which a tube is connected to a connected portion. The connected portion includes an inner tube and an outer tube disposed on the outer periphery of the inner tube with a gap. A claw projecting toward the inner tube is provided at the tip of the outer tube. The drip tube has a cylinder member that is disposed in a gap between the inner tube and the outer tube and is locked in a direction of being detached from the gap by the claw. This cylindrical member can be bonded to a tube inserted outside the inner tube.

  The drip tube drops infused infusion fluid or the like and causes it to flow out to a tube connected to the connected portion. A cylindrical member is externally fitted to the inner tube of the connected portion through a gap that is about the thickness of the tube. The cylindrical member is held by a claw provided on the outer tube of the connected portion so as not to be detached from the gap between the inner tube and the outer tube.

  A tube is connected to the connected portion of the drip tube. This tube is externally fitted to the inner tube of the connected portion, and the tip end side is inserted into the gap between the inner tube and the cylindrical member and is bonded to the cylindrical member with an adhesive or the like. By selecting a material that can be bonded to the tube as the material of the cylindrical member, the connection strength between the tube and the connected portion is not weakened.

  (2) The claw may protrude so as not to contact the tube.

  Thereby, when the tube is inserted into the gap between the inner tube of the connected portion and the cylindrical member, the tube does not come into contact with the claw, so that the tube connection work is easy.

  (3) The present invention may be regarded as an infusion circuit having the drip tube and a tube that is inserted outside the inner tube and welded to the tube member.

  (4) A method for producing an infusion circuit according to the present invention includes an inner tube, and an inner tube and a drip tube having a connected portion having an outer tube disposed on the outer periphery of the inner tube via a gap. A first step of disposing the cylindrical member in the gap between the outer tube and the outer tube, and a claw protruding toward the inner tube is formed at the tip of the outer tube, and the cylindrical member is removed from the gap by the claw. A second step of locking with respect to the separating direction, and a third step of inserting the tube outside the inner tube and welding the tube and the tubular member.

  (5) In the second step, the claw may be formed by applying an ultrasonic wave to the tip of the outer tube.

  According to the present invention, the cylindrical member is held by the claw provided on the outer tube of the connected portion so as not to be detached from the gap between the inner tube and the outer tube. Since the tube is inserted and connected in the gap with the inner tube, the material of the tube member that can be bonded to the tube is selected, so the connection strength between the tube and the connected part does not become weak . Moreover, materials other than a polyvinyl chloride can be used for parts other than a cylindrical member.

  Moreover, since the said nail | claw is protruded so that it may become non-contact with the said tube, the operation | work in which a tube is inserted in the clearance gap between the inner tube of a to-be-connected part and a cylinder member is easy.

FIG. 1 is a front view showing an outer tube configuration of an infusion tube 10 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a cross section near the connected portion 15 of the drip tube 10. FIG. 3 is a cross-sectional view for explaining the first step. FIG. 4 is a cross-sectional view for explaining the jig 30. FIG. 5 is a diagram for explaining the second step. FIG. 6 is a diagram for explaining the second step.

  Hereinafter, preferred embodiments of the present invention will be described. In addition, this embodiment is only one embodiment of this invention, and it cannot be overemphasized that an embodiment can be changed in the range which does not change the summary of this invention.

[Schematic configuration of drip tube 10]
As shown in FIG. 1, the drip tube 10 is used with tubes 11 and 12 connected to both ends in the longitudinal direction (vertical direction in FIG. 1). Although not shown, the drip tube 10 and the tubes 11 and 12 are configured as a part of the infusion circuit. As one configuration of the infusion circuit, for example, an introduction needle that is pierced into the infusion container is provided at the end of the tube 11 opposite to the side connected to the infusion tube 10, and the tube 12 is connected to the infusion tube 10. A mode in which a venous needle is provided at the end opposite to the side opposite to the side and a clamp for adjusting the flow rate of the infusion is provided on the tube 12 is exemplified.

  The drip tube 10 has a main body 13 and a cap 14. The main body 13 is a substantially cylindrical container, and one end side (the lower end side in FIG. 1) is reduced in diameter to form a connected portion 15. The tube 12 is connected to the connected portion 15. The connection structure between the connected portion 15 and the tube 12 will be described later. A cap 14 is fitted in the opening on the other end side (the upper end side in FIG. 1) of the main body 13. The cap 14 is provided with a connected portion 16 connected to the tube 11. The infusion fluid circulated through the tube 11 flows into the main body 13 from the connected portion 16 of the cap 14 and flows out from the connected portion 15 into the tube 12.

  The constituent materials of the main body 13 and the cap 14 are not particularly limited, but when non-chlorine materials such as polyolefins such as polyethylene and polypropylene are selected, the risk of dioxins being generated when the drip tube 10 is canceled is suppressed. This is preferable.

[Connection structure between the connected portion 15 and the tube 12]
As shown in FIG. 2, the connected portion 15 includes an inner tube 21 and an outer tube 22. The inner tube 21 and the outer tube 22 have a double tube structure with the same axis 101. The inner tube 21 and the outer tube 22 are formed integrally with the main body 13. Therefore, the inner tube 21 and the outer tube 22 are made of the same material as that of the main body 13.

  The inner tube 21 has a cylindrical shape that protrudes downward along the axis 101 from the lower end of the main body 13. Both ends of the inner tube 21 are opened, and one of the openings forms a port to the internal space of the main body 13. The other opening communicates with the outside of the main body 13. The outer diameter of the inner tube 21 is the same as or slightly larger than the inner diameter of the tube 12. The tube 12 can be fitted on the inner tube 21. Therefore, the infusion solution temporarily stored in the main body 13 flows out from the main body 13 to the tube 12 through the internal space of the inner tube 21.

  The outer tube 22 is disposed on the outer periphery of the inner tube 21 via a gap. The outer tube 22 has a cylindrical shape that protrudes downward along the axis 101 from the lower end of the main body 13. The length along the axis 101 of the outer tube 22 is shorter than the length along the axis 101 of the inner tube 21. Therefore, the inner tube 21 protrudes downward along the axis 101 from the outer tube 22. The upper end of the outer tube 22 is connected to the outer wall of the main body 13. The internal space of the outer tube 22 is not continuous with the internal space of the main body 13.

  A claw 23 that protrudes toward the inner tube 21 is provided at the tip (the lower end in FIG. 1) of the outer tube 22. The claw 23 is provided on the entire tip of the outer tube 22 and has an annular shape. The claw 23 protrudes into the gap between the outer tube 22 and the inner tube 21. The length by which the claw 23 protrudes is within the range of the thickness of the cylindrical member 24 described later. Therefore, the claw 23 is not in contact with the tube 12.

  A cylindrical member 24 is arranged in the gap between the inner tube 21 and the outer tube 22. The cylindrical member 24 has an outer diameter approximately the same as the inner diameter of the outer tube 22, and the inner diameter is larger than the outer diameter of the inner tube 21. Therefore, the cylindrical member 24 has an outer peripheral surface in contact with the inner peripheral surface of the outer tube 22, and the inner peripheral surface is not in contact with the outer peripheral surface of the inner tube 21. Has been placed. The gap between the tubular member 24 and the inner tube 21 is the same as or slightly smaller than the wall thickness of the tube 12. Therefore, the inner peripheral surface of the cylindrical member 24 is in contact with the outer peripheral surface of the tube 12, and the cylindrical member 24 and the tube 12 are bonded by an adhesive.

  The length along the axis 101 of the cylindrical member 24 is the same as or slightly shorter than the length along the axis 101 of the outer tube 22. The lower end of the cylindrical member 24 is locked by a claw 23 with respect to a direction (downward direction in FIG. 2) that is detached from the gap between the inner tube 21 and the outer tube 22. In this way, the tube member 24 is locked by the claw 23, so that the tube 12 bonded to the tube member 24 is fixed in a state of being fitted on the inner tube 21.

[Manufacturing method of infusion tube 10]
Hereinafter, the manufacturing method of the drip tube 10 will be described. The manufacturing method of the drip tube 10 is roughly divided into the following three configurations.
(1) A first step in which the tubular member 24 is disposed in the gap between the inner tube 21 and the outer tube 22 in the connected portion 15 in which the inner tube 21 and the outer tube 22 are formed.
(2) A second step in which a claw 23 is formed at the tip of the outer tube 22 and the cylinder member 24 is locked by the claw 23 in a direction in which it is detached from the gap.
(3) A third step of inserting the tube 12 outside the inner tube 21 and bonding the tube 12 and the cylindrical member 24 together.
3 and 5, the connected portion 15 is illustrated with the tip of the outer tube 22 that is the lower side in FIG. 2 being the upper side. That is, in FIG.3 and FIG.5, the main body 13 of the drip tube 10 is shown upside down with respect to FIG.

  In the first step, as shown in FIG. 3, the cylindrical member 24 is inserted into the gap between the inner tube 21 and the outer tube 22 in the connected portion 15 of the main body 13. The cylindrical member 24 is inserted from the distal end of the outer tube 22 (upper end in FIG. 3) to the inner side (lower side in FIG. 3), and the distal end of the outer tube 22 protrudes outward from the main body 13 from the cylindrical member 24. It becomes a state. In this state, the outer peripheral surface of the cylindrical member 24 is in contact with the inner peripheral surface of the outer tube 22. Further, a gap is generated between the inner peripheral surface of the cylindrical member 24 and the outer peripheral surface of the inner tube 21. In the gap, the tube 12 is inserted in the third step.

  In the second step, the claw 23 is formed at the tip of the outer tube 22. The claw 23 is formed by applying an ultrasonic wave to the tip of the outer tube 22 using a jig 30 described later. As shown in FIG. 4, the tip of the jig 30 has a generally cylindrical shape. Note that the jig 30 has a generally cylindrical shape as a whole, but in FIG. At the tip of the jig 30, a contact portion 31 that contacts the tip of the outer tube 22 is formed. The contact portion 31 is wider than the thickness of the outer tube 22 and forms a dome-shaped space that is narrower than the sum of the thickness of the outer tube 22 and the thickness of the cylindrical member 24. An annular shape corresponding to the entire tip of 22. The inner peripheral surface 32 of the contact portion 31 has an outer portion 33 protruding from the inner portion 34 in the direction of the axis 102. The diameter of the outer portion 33 around the axis 102 is set to be approximately the same as the outer diameter of the outer tube 22. A long hole 35 is formed along the axis 102 at the center of the tip of the jig 30. The long hole 35 has a diameter larger than the outer diameter of the inner tube 21, and a depth along the axis 102 is deeper than the length of the inner tube 21. Accordingly, the inner tube 21 can be completely inserted into the long hole 35.

  As shown in FIG. 5, when the tip portion of the jig 30 is applied to the connected portion 15 in which the cylindrical member 24 is inserted, the contact portion 31 of the jig 30 comes into contact with the tip of the outer tube 22. . In this state, the outer portion 33 of the inner peripheral surface 32 of the contact portion 31 is in contact with the outer peripheral surface of the outer tube 22. Then, the tip of the outer tube 22 is melted by applying ultrasonic waves to the tip of the outer tube 22 via the jig 30. The tip of the melted outer tube 22 is deformed along the shape of the contact portion 31 of the jig 30. As described above, the abutting portion 31 is wider than the thickness of the outer tube 22 and narrower than the sum of the thickness of the outer tube 22 and the thickness of the cylindrical member 24, so Is deformed so as to protrude toward the inner tube 21. By this deformation, a claw 23 is formed at the tip of the outer tube 22.

  When the claw 23 is formed, the jig 30 is separated from the connected portion 15 as shown in FIG. The claw 23 protrudes toward the inner tube 21 so as to cover the tubular member 24, but does not protrude from the tubular member 24 toward the inner tube 21. Therefore, as will be described later, when the tube 12 is inserted, the claw 23 is not in contact with the tube 12.

  In the third step, as shown in FIG. 2, the tube 12 is inserted outside the inner tube 21, and the tube 12 and the cylindrical member 24 are bonded. As described above, since there is a gap corresponding to the thickness of the tube 12 between the inner tube 21 and the cylindrical member 24, the tube 12 can be easily inserted into the gap between the inner tube 21 and the cylindrical member 24. Is done. When the tube 12 is inserted, the tube 12 is bonded to the cylindrical member 24 by applying an adhesive in advance to the outer peripheral surface of the tube 12 or the inner peripheral surface of the cylindrical member 24.

  The tube 11 is connected to the cap 14 in advance, and the cap 14 is fitted to the main body 13 described above. The main body 13 and the cap 14 may be fitted before or after the tube 12 is connected to the main body 13.

[Operational effects of this embodiment]
As described above, the cylindrical member 24 is held by the claw 23 provided on the outer tube 22 of the connected portion 15 so as not to be detached from the gap between the inner tube 21 and the outer tube 22. Since the tube 12 is inserted into and connected to the gap between the tubular member 24 and the inner tube 21, a material that can be bonded to the tube 12 is selected as the material of the tubular member 24. The connection strength between 12 and the connected portion 15 does not become weak. Moreover, materials other than polyvinyl chloride can be used for parts other than the cylindrical member 24.

  Moreover, since the nail | claw 23 protrudes so that it may become non-contact with the tube 12, the operation | work in which the tube 12 is inserted in the clearance gap between the inner tube 21 of the to-be-connected part 15 and the cylinder member 24 is easy.

DESCRIPTION OF SYMBOLS 10 ... Infusion tube 12 ... Tube 15 ... Connected part 21 ... Inner tube 22 ... Outer tube 23 ... Claw 24 ... Tube member

Claims (3)

An infusion circuit in which a tube is connected to a connected portion of an infusion tube ,
The connected portion includes an inner tube and an outer tube disposed on the outer periphery of the inner tube via a gap,
A claw projecting out of contact with the tube toward the inner tube is provided at the tip of the outer tube,
In the gap between the inner tube and the outer tube, there is disposed a locked-cylinder member with respect to a direction leaving from the gap by the pawl,
The infusion circuit, wherein the tube is inserted outside the inner tube and welded to the cylindrical member. A tube member is arranged in a gap between the inner tube and the outer tube in a drip tube having a connected portion having an inner tube and an outer tube arranged on the outer periphery of the inner tube via a gap. 1 process,
Forming a claw projecting toward the inner pipe at the tip of the outer pipe, and locking the cylindrical member with respect to the direction of detaching from the gap by the claw;
A method for manufacturing an infusion circuit, comprising: a third step of inserting a tube outside the inner tube and welding the tube and the tubular member. The method for manufacturing an infusion circuit according to claim 2 , wherein in the second step, the claw is formed by applying an ultrasonic wave to a tip of the outer tube.

Images