CN112643990B

CN112643990B - Forming process of reinforced double-cavity tube and reinforced double-cavity tube

Info

Publication number: CN112643990B
Application number: CN202011379014.0A
Authority: CN
Inventors: 郑剑波; 刘志军; 马奔; 袁栋平
Original assignee: Dongguan Kewei Medical Instrument Co Ltd
Current assignee: Dongguan Kewei Medical Instrument Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2023-04-28
Anticipated expiration: 2040-11-30
Also published as: CN112643990A

Abstract

The invention discloses a molding process of a reinforced double-cavity tube, which comprises the following steps: obtaining a double-cavity tube, and maintaining the shape of the double-cavity tube unchanged; sleeving the reinforcing ribs outside the double-cavity tube; sleeving the outer fixed pipe outside the reinforcing rib; sleeving the first heat-shrinkable sleeve outside the outer fixed pipe; heating the first heat-shrinkable sleeve, so that the first heat-shrinkable sleeve is shrunk and coated on the outer fixed pipe, and the outer fixed pipe is welded on the outer walls of the reinforcing ribs and the double-cavity pipe; the invention also discloses a reinforced double-cavity tube. This application welds the strengthening rib in the outer wall of dual-chamber pipe through outer solid pipe for the strengthening rib can provide stable support for dual-chamber pipe, has guaranteed the support reinforcing effect of strengthening rib.

Description

Forming process of reinforced double-cavity tube and reinforced double-cavity tube

Technical Field

The invention relates to the technical field of medical intubation, in particular to a molding process of a reinforced double-cavity tube and the reinforced double-cavity tube.

Background

The application of the double-cavity tube in industries such as industry and medical treatment is becoming wider and wider. Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a conventional reinforced dual lumen tube. The reinforced double-cavity tube comprises an inner cavity tube 10, an outer cavity tube 20 and reinforcing ribs 30, wherein the outer cavity tube 20 is sleeved outside the inner cavity tube 10, and the inner wall of the outer cavity tube 20 is connected with the outer wall of the inner cavity tube 10, so that two cavities which are not interfered with each other are formed; the reinforcing ribs 30 are sleeved outside the outer cavity tube 20, and the reinforcing ribs 30 are generally springs. When the double-cavity catheter is specifically applied to the intubation for the medical industry, the two cavities of the double-cavity catheter are respectively communicated with the artery and vein of a human body, so that the treatment process is completed by matching with medical equipment. The reinforcing ribs 30 reinforce the cavities of the inner cavity tube 10 and the outer cavity tube 20 and support the two cavities of the double cavity tube so as to ensure smooth blood flow in the double cavity tube and also protect the double cavity tube, thereby ensuring smooth application of the medical intubation. At present, for the reinforced dual-cavity tube manufacturing process, the reinforcing ribs are directly sleeved outside the dual-cavity tube, and the reinforcing ribs and the dual-cavity tube can relatively move, so that the supporting and reinforcing effects of the reinforcing ribs can be influenced.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a molding process of a reinforced double-cavity tube and the reinforced double-cavity tube.

The invention discloses a molding process of a reinforced double-cavity tube, which comprises the following steps:

obtaining a double-cavity tube, and maintaining the shape of the double-cavity tube unchanged;

sleeving the reinforcing ribs outside the double-cavity tube;

sleeving the outer fixed pipe outside the reinforcing rib;

sleeving the first heat-shrinkable sleeve outside the outer fixed pipe;

and heating the first heat-shrinkable sleeve, so that the first heat-shrinkable sleeve is shrunk and coated on the outer fixed pipe, and the outer fixed pipe is welded on the outer walls of the reinforcing ribs and the double-cavity pipe.

According to an embodiment of the present invention, a dual lumen tube is obtained and maintains the shape of the dual lumen tube unchanged, comprising:

directly extruding the double-cavity tube through an extrusion molding process;

the shape of the two cavities of the double-cavity tube is maintained unchanged through the first mandrel and the second mandrel respectively.

respectively obtaining an inner cavity tube and an outer cavity tube;

the outer cavity pipe is sleeved outside the inner cavity pipe, and the cavity shapes of the inner cavity pipe and the outer cavity pipe are respectively maintained unchanged through the first mandrel and the second mandrel;

the inner wall of the outer cavity pipe is stuck to the outer wall of the inner cavity pipe to form a wall sticking part; the cavity of the outer cavity tube is matched with the cavity of the inner cavity tube to form two cavities of the double-cavity tube.

According to one embodiment of the invention, the reinforcing ribs are sleeved outside the outer cavity pipe; and heating the first heat-shrinkable sleeve, so that the first heat-shrinkable sleeve is shrunk and coated on the outer fixed pipe, and the outer fixed pipe is welded on the outer wall of the reinforcing rib and the double-cavity pipe, and the inner cavity pipe and the outer cavity pipe of the wall-attached part are welded at the same time.

According to an embodiment of the present invention, the inner wall of the outer cavity tube is adhered to the outer wall of the inner cavity tube to form an wall adhesion part, and then the method further comprises:

sleeving the second heat shrinkage sleeve outside the outer cavity pipe;

heating the second heat-shrinkable sleeve, so that the second heat-shrinkable sleeve is shrunk and coated on the outer cavity pipe, and the inner cavity pipe of the wall attaching part is welded with the outer cavity pipe;

and after the second heat-shrinkable sleeve is cooled, tearing off the heat-shrinkable sleeve to obtain the double-cavity tube.

According to an embodiment of the present invention, an inner lumen tube and an outer lumen tube are obtained, respectively, comprising: the inner cavity tube and the outer cavity tube are obtained through an injection molding process; or the inner cavity tube and the outer cavity tube are obtained through an extrusion molding process.

According to an embodiment of the present invention, welding an inner lumen of a wall mount to an outer lumen comprises:

the ends of the inner cavity tube and the outer cavity tube which are far away from the wall attachment part are not welded.

According to an embodiment of the invention, the cross section of the first mandrel is circular; the cross section of the second mandrel is crescent; the second mandrel is provided with an accommodating space; the first mandrel can be accommodated in the accommodating space.

According to an embodiment of the present invention, the external fixing tube is welded to the reinforcing rib and the external wall of the dual-cavity tube, and then further comprises:

after the first heat-shrinkable sleeve is cooled, tearing off the first heat-shrinkable sleeve after heat shrinkage;

and respectively extracting the first mandrel and the second mandrel to obtain the reinforced double-cavity tube.

A reinforced double-cavity tube molded by the molding process of the reinforced double-cavity tube is adopted.

The beneficial effects of the application are that: the reinforcing ribs are welded to the outer wall of the double-cavity tube through the outer fixed tube, so that the reinforcing ribs can provide stable support for the double-cavity tube, and the supporting and reinforcing effects of the reinforcing ribs are guaranteed. In addition, through the butt fusion protection of first heat shrinkage bush, can avoid direct heating to influence the outward appearance that adds strong two-chamber pipe, and the inward shrinkage force of first heat shrinkage bush can promote the strengthening rib butt fusion process to guarantee the butt fusion quality of strengthening rib. Moreover, a novel double-cavity tube forming process is provided, wherein an inner cavity tube and an outer cavity tube are obtained respectively, and then the double-cavity tube is obtained in a welding mode of the inner cavity tube and the outer cavity tube, the wall thickness of the formed double-cavity tube is thinner, the effective utilization area of a cavity is larger, the utilization rate of the cavity is higher, and the double-cavity tube forming process is convenient to apply in the field of medical intubation. In addition, the molding process of the reinforced double-cavity tube provides a novel double-cavity tube molding mode on the basis of the current mature application technology, the cavity of the double-cavity tube can be adjusted according to actual requirements, molding quality control is easier to control, and cost in a research and development stage is lower.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic cross-sectional view of a prior art reinforced dual lumen tube;

FIG. 2 is a flow chart of a process for forming a reinforced dual-lumen tube according to the first embodiment;

FIG. 3 is a schematic structural view of a dual lumen tube, a stiffener, an outer solid tube, a first heat shrink, a first mandrel, and a second mandrel in accordance with the first embodiment;

FIG. 4 is a longitudinal cross-sectional view and a transverse cross-sectional view of a dual lumen tube, a second mandrel in accordance with the first embodiment;

FIG. 5 is a longitudinal cross-sectional view and a transverse cross-sectional view of a dual lumen tube, a first mandrel, a second mandrel, according to the first embodiment;

FIG. 6 is a longitudinal cross-sectional view and a transverse cross-sectional view of a dual lumen tube, a first mandrel, a second mandrel, and a stiffener according to the first embodiment;

FIG. 7 is a longitudinal sectional view and a transverse sectional view of a dual lumen tube, a first mandrel, a second mandrel, a reinforcing rib, and an outer solid tube in accordance with the first embodiment;

FIG. 8 is a longitudinal sectional view and a transverse sectional view of a double-lumen tube, a first mandrel, a second mandrel, a reinforcing rib, an outer fixing tube, and a first heat-shrinkable sleeve in the first embodiment;

fig. 9 is a flowchart of step S1 in the second embodiment;

fig. 10 is a schematic structural diagram of an inner cavity tube, an outer cavity tube, a reinforcing rib, an outer fixing tube, a first heat shrinkage sleeve, a first mandrel and a second mandrel in the second embodiment;

FIG. 11 is a longitudinal cross-sectional view of the lumen tube and the first mandrel in the second embodiment;

FIG. 12 is a longitudinal cross-sectional view and a transverse cross-sectional view of the lumen tube, the first mandrel, the second mandrel in the second embodiment;

fig. 13 is a longitudinal sectional view of the inner lumen, the first mandrel, the second mandrel, the outer lumen, and a transverse sectional view of the outer lumen in this embodiment;

fig. 14 is a flowchart of step S1 in the third embodiment;

fig. 15 is a schematic structural diagram of an inner cavity tube, an outer cavity tube, a second heat-shrinkable sleeve, a reinforcing rib, an outer fixed tube, a first heat-shrinkable sleeve, a first mandrel and a second mandrel in the third embodiment;

fig. 16 is a longitudinal sectional view and a transverse sectional view of an inner lumen tube, a first mandrel, a second mandrel, an outer lumen tube, a second heat shrink tube in the third embodiment;

fig. 17 is a transverse cross-sectional view of a dual lumen tube in embodiment three.

Detailed Description

Various embodiments of the invention are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the invention. That is, in some embodiments of the invention, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.

It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture such as that shown in the drawings, and if the particular posture is changed, the directional indication is changed accordingly.

In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the invention solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:

example 1

Referring to fig. 2, fig. 2 is a flowchart of a process for forming a reinforced dual-lumen tube in the first embodiment, and fig. 3 is a schematic structural diagram of the dual-lumen tube, the reinforcing ribs, the external fixing tube, the first heat shrinkage bush, the first mandrel and the second mandrel in the first embodiment. The forming process of the reinforced double-cavity tube in the embodiment comprises the following steps:

s1, obtaining the double-cavity tube 100 and maintaining the shape of the double-cavity tube 100 unchanged.

S2, sleeving the reinforcing ribs 30 outside the double-cavity tube 100.

S3, sleeving the outer fixing pipe 40 outside the reinforcing rib 30.

S4, sleeving the first heat-shrinkable sleeve 1 outside the outer fixed pipe 40.

S5, heating the first heat-shrinkable sleeve 1 to shrink and wrap the first heat-shrinkable sleeve 1 on the outer fixed pipe 40, and welding the outer fixed pipe 40 on the outer walls of the reinforcing ribs 30 and the double-cavity pipe 100.

The reinforcing ribs 30 are welded to the outer wall of the double-cavity tube 100 through the outer fixed tube 40, so that the reinforcing ribs 30 can provide stable support for the double-cavity tube 100, and the supporting and reinforcing effects of the reinforcing ribs 30 are guaranteed. In addition, through the welding protection of the first heat-shrinkable sleeve 1, the direct heating can be prevented from affecting the appearance of the strong dual-lumen tube 100, and the inward shrinkage force of the first heat-shrinkable sleeve 1 can promote the welding process of the reinforcing ribs 30, so as to ensure the welding quality of the reinforcing ribs 30.

Referring again to fig. 4 and 5, fig. 4 is a longitudinal sectional view and a lateral sectional view of the dual lumen tube, the second mandrel in the first embodiment, and fig. 5 is a longitudinal sectional view and a lateral sectional view of the dual lumen tube, the first mandrel, and the second mandrel in the first embodiment. Further, in step S1, the dual-lumen tube 100 is obtained and the shape of the dual-lumen tube 100 is maintained unchanged, including:

s1a, directly extruding the double-cavity tube 100 through an extrusion molding process. The dual-cavity tube 100 in this embodiment is made of polyurethane, and can be directly extruded by the existing extrusion molding process, for example, by matching an extruder with an extrusion cavity of the dual-cavity tube 100, the emulsion-state polyurethane can be directly extruded into the shape of the dual-cavity tube 100.

S1b, the shape of the two cavities of the dual-cavity tube 100 is maintained unchanged by the first mandrel 2 and the second mandrel 3 respectively. The first mandrel 2 in this embodiment is circular in cross section. The cross section of the second mandrel 3 is crescent-shaped. The second spindle 3 has an accommodating space 31, and the first spindle 2 can be accommodated in the accommodating space 31. Specifically, the first mandrel 2 and the second mandrel 3 are both made of stainless steel. Wherein, accommodation space 31 is along the axial seting up second dabber 3, and along the outer wall intercommunication of axis direction accommodation space 31 and second dabber 3, accommodation space 31's cross section is approximately oval, so makes the cross section of second dabber 3 crescent. The length of the first mandrel 2 is greater than the length of the second mandrel 3, and the length of the second mandrel 3 is greater than the length of the dual lumen tube 100. The dual-cavity tube 100 is provided with two cavities which are not interfered with each other along the axis direction, wherein the cross section of one cavity is round, and the round is matched with the round of the cross section of the first mandrel 2; the cross section of the other cavity is in a crescent shape, the crescent shape is matched with the crescent shape of the cross section of the second mandrel 3, the crescent cavity of the double-cavity tube 100 is coated with a round cavity, and the outer edge of the cross section of the whole double-cavity tube 100 is round. The second mandrel 3 is inserted into the crescent cavity of the dual-cavity tube 100 along the axial direction, and then the first mandrel 2 is inserted into the circular cavity of the dual-cavity tube 100, or the first mandrel 2 is inserted into the second mandrel 3, and after both the first mandrel 2 and the second mandrel 3 are inserted, both ends of the first mandrel 2 and both ends of the second mandrel 3 leak from both ends of the dual-cavity tube 100. The first mandrel 2 and the second mandrel 3 with the adaptive shapes can cooperate to support the round cavity and the crescent cavity of the double-cavity tube 100 so as to maintain the shape of the two cavities of the double-cavity tube 100 unchanged, avoid the influence of subsequent welding on the cavity shape of the double-cavity tube 100, ensure the smooth molding of the reinforced double-cavity tube and also ensure the molding quality of the reinforced double-cavity tube.

Referring again to fig. 6, fig. 6 is a longitudinal sectional view and a transverse sectional view of the dual lumen tube, the first mandrel, the second mandrel, and the stiffener according to the first embodiment. Further, in step S2, the reinforcing ribs 30 are sleeved outside the dual-lumen tube 100. Specifically, the reinforcing rib 30 is a spring, in this embodiment, a medical spring. The inner diameter of the reinforcing rib 30 is matched with the outer diameter of the double-cavity tube 100, the reinforcing rib 30 is sleeved outside the double-cavity tube 100 along the axial direction, and the outer wall of the double-cavity tube 100 is attached to the inner wall of the reinforcing rib 30. In this embodiment, the length of the reinforcing rib 30 is smaller than that of the dual-lumen tube 100, and after the dual-lumen tube 100 is sleeved with the reinforcing rib 30, two ends of the dual-lumen tube 100 leak from two ends of the reinforcing rib 30.

Referring again to fig. 7, fig. 7 is a longitudinal sectional view and a transverse sectional view of the dual-lumen tube, the first mandrel, the second mandrel, the reinforcing ribs, and the external fixation tube in the first embodiment. Further, in step S3, the outer fixing pipe 40 is sleeved outside the reinforcing rib 30. Specifically, the outer fixing tube 40 is a thin-walled tube made of polyurethane, the inner diameter of which is adapted to the outer diameter of the reinforcing rib 30, and the reinforcing tube 40 is sleeved outside the reinforcing rib 30 along the axial direction, and the inner wall of the reinforcing tube 40 is attached to the outer wall of the reinforcing rib 30. In this embodiment, the length of the reinforcing pipe 40 is identical to the length of the reinforcing rib 30, so that the reinforcing pipe 40 can be completely wrapped on the outer wall of the reinforcing rib 30. And the reinforcing tube 40 is selected from the same material as the dual-lumen tube 100 such that the melting point of the reinforcing tube 40 is consistent with that of the dual-lumen tube 100 to facilitate welding of the reinforcing tube 40 to the outer wall of the dual-lumen tube 100.

Referring again to fig. 8, fig. 8 is a longitudinal sectional view and a transverse sectional view of the dual-lumen tube, the first mandrel, the second mandrel, the reinforcing ribs, the external fixation tube, and the first heat-shrinkable sleeve in the first embodiment. Further, in step S4, the first heat shrinkable sleeve 1 is sleeved outside the outer fixing tube 40. Specifically, the first heat-shrinkable sleeve 1 is made of EVA, FEP, PE or one of PTFE. When heated, the first heat-shrinkable sleeve 1 shrinks inward. The inner diameter of the first heat-shrinkable sleeve 1 is larger than the outer diameter of the reinforced pipe 40, the first heat-shrinkable sleeve 1 is sleeved outside the reinforced pipe 40 along the axial direction, and a gap is reserved between the inner wall of the first heat-shrinkable sleeve 1 and the outer wall of the reinforced pipe 40. The length of the first heat-shrinkable sleeve 1 is greater than the length of the double-cavity tube 100, so that the first heat-shrinkable sleeve 1 can be completely coated outside the double-cavity tube 100 during heat shrinkage, and the double-cavity tube 100 is comprehensively protected.

In step S5, the first heat-shrinkable sleeve 1 is heated, so that the first heat-shrinkable sleeve 1 is shrunk and wrapped on the outer fixed tube 40, and the outer fixed tube 40 is welded to the reinforcing ribs 30 and the outer wall of the double-lumen tube 100. Specifically, the first heat-shrinkable sleeve 1 may be heated by a heating device, for example, a heat gun. In order to enhance the stability of heating, a custom heating device, such as a heating furnace, may also be used to provide a stable heating space with a height that matches the length of the outer solid tube 40. The heating device heats from the outer wall of the first heat shrinkage bush 1 on the circumferential surface, the specific heating time and heating temperature are based on the actual requirement, and the outer fixing tube 40 is welded to the reinforcing ribs 30 and the outer wall of the double-cavity tube 100. The heating temperature in this embodiment is between 150 and 250 degrees celsius, with a preferred heating temperature of 200 degrees celsius. The heating time is between 3 and 6 minutes, with a preferred heating time of 4 minutes. In the specific application, the heating time can be reduced if the heating temperature is higher according to the actual situation, and vice versa.

Along with the heating, the heated first heat shrinkage sleeve 1 can shrink inwards and cover the outer solid tube 40, the inner wall of the outer solid tube 40 is tightly attached to the outer wall of the reinforcing rib 30, and then heat acts on the outer wall of the double-cavity tube 100, so that the outer wall of the double-cavity tube 100 is tightly attached to the inner wall of the reinforcing rib 30. The outer solid tube 40 and the double-cavity tube 100 which are made of polyurethane materials have the same melting point, and the outer walls of the outer solid tube 40 and the double-cavity tube 100 can be melted simultaneously along with the continuous heating, so that the inner wall of the outer solid tube 40 and the outer wall of the double-cavity tube 100 are welded together, the reinforcing rib 30 between the inner wall of the outer solid tube 40 and the outer wall of the double-cavity tube 100 naturally forms a welding state with the outer solid tube 40 and the double-cavity tube 100 respectively, the reinforcing rib 30 and the double-cavity tube 100 form a whole, a stable support is formed for the double-cavity tube 100, the supporting and reinforcing effects of the reinforcing rib 30 are guaranteed, the quality of the reinforced double-cavity tube is guaranteed, the outer wall thickness of the welded outer solid tube 40 can be further thickened, and the quality of the reinforced double-cavity tube 100 is further increased. In addition, the external fixed pipe 40 and the double-cavity pipe 100 are heated and welded through the first heat shrinkage sleeve 1, and the heating is not directly applied to the external fixed pipe 40 and the double-cavity pipe 100, so that the external fixed pipe 40 and the double-cavity pipe 100 are protected, and the quality of the final reinforced double-cavity pipe is further improved. Moreover, the inward shrinkage force of the first heat shrinkage bush 1 acts on the external fixed pipe 40 and the double-cavity pipe 100 which are being welded, so that the welding process of the external fixed pipe 40 and the double-cavity pipe 100 is accelerated, the welding effect is ensured, and the quality of the reinforced double-cavity pipe is further improved.

Referring back to fig. 2, in the process of forming the reinforced dual-lumen tube in this embodiment, in step S5, the external fixing tube 40 is welded to the reinforcing rib 30 and the outer wall of the dual-lumen tube, and then further includes:

s6, after the first heat-shrinkable sleeve 1 is cooled, tearing off the heat-shrinkable first heat-shrinkable sleeve 1. In this embodiment, natural cooling may be adopted, or accelerated cooling may be adopted by a cooling device, such as air-blowing accelerated cooling. And (5) tearing off the first heat-shrinkable sleeve 1 after cooling to room temperature.

S7, respectively extracting the first mandrel 2 and the second mandrel 3 to obtain the reinforced double-cavity tube. The existing extraction device may be specifically used to perform the extraction actions of the first mandrel 2 and the second mandrel 3, which will not be described herein.

Example two

Referring to fig. 9 and 10, fig. 9 is a flowchart of step S1 in the second embodiment, and fig. 10 is a schematic structural diagram of the inner cavity tube, the outer cavity tube, the reinforcing ribs, the outer fixing tube, the first heat shrinkage bush, the first mandrel and the second mandrel in the second embodiment. The molding process of the reinforced dual-lumen tube in this embodiment is different from that of the first embodiment in that:

in step S1, a dual lumen tube 100 is obtained and the shape of the dual lumen tube 100 is maintained, comprising the sub-steps of:

S1A, the inner lumen 10 and the outer lumen 20 are obtained, respectively.

S1B, the outer cavity tube 20 is sleeved outside the inner cavity tube 10, and the cavity shapes of the inner cavity tube 10 and the outer cavity tube 20 are respectively maintained unchanged through the first mandrel 2 and the second mandrel 3.

S1C, enabling the inner wall of the outer cavity tube 20 to be attached to the outer wall of the inner cavity tube 10 to form an wall attaching part; the cavity of the outer lumen 20 cooperates with the cavity of the inner lumen 10 to form two cavities of the dual lumen tube 100.

In step S2, the stiffener 30 is sleeved outside the outer cavity tube 20.

In step S5, the first heat-shrinkable sleeve 1 is heated, so that the first heat-shrinkable sleeve 1 is shrunk and wrapped on the external fixed tube 40, and the external fixed tube 40 is welded to the reinforcing rib 30 and the outer wall of the dual-cavity tube, and the inner cavity tube 10 and the outer cavity tube 20 of the wall-attached portion are welded at the same time.

It will be appreciated that the wall thickness control of the dual lumen tube is also critical, particularly in applications in the medical cannula field, because the thinner the tube wall is, the greater the blood flow through the cannula at the same time, while the dual lumen tube 100 is extruded through the extruder, which results in a thicker wall thickness of the dual lumen tube 100, thereby affecting the effective utilization area and the effective utilization of the lumen of the dual lumen tube 100. In the process of forming the reinforced dual-cavity tube in this embodiment, the inner cavity tube 10 and the outer cavity tube 20 are obtained respectively, and then the dual-cavity tube 100 is obtained by welding the inner cavity tube 10 and the outer cavity tube 20, so that the wall thickness of the formed dual-cavity tube 100 is thinner, the effective utilization area of the cavity is larger, the utilization rate of the cavity is higher, and the reinforced dual-cavity tube is convenient to apply in the field of medical intubation.

Preferably, in step S1A, the inner lumen 10 and the outer lumen 20 are obtained, respectively. Specifically, the inner tube 10 and the outer tube 20 are obtained by an injection molding process, or the inner tube 10 and the outer tube 20 are obtained by an extrusion molding process. The inner cavity tube 10 and the outer cavity tube 20 in this embodiment are both thin-walled tubes made of polyurethane. In specific application, the polyurethane thin-wall pipe can be prepared through an injection molding process, for example, the polyurethane thin-wall pipe is injection molded through an injection molding machine, and in the injection molding process, the wall thickness of the thin-wall pipe can be limited by a mold, so that a thinner pipe wall can be obtained according to practical situations. Similarly, the polyurethane thin-walled tube may be manufactured by an extrusion molding process, such as extruding the polyurethane thin-walled tube through an extruder, wherein the extrusion cavity of the extruder is limited less than the extrusion cavity of the dual-cavity tube 100 because the inner cavity tube 10 and the outer cavity tube 20 are single-cavity, thereby obtaining a relatively thinner single-cavity thin-walled tube. In the embodiment, the obtaining of the thin-walled tubular inner cavity tube 10 and the outer cavity tube 20 in the step S1A lays a foundation for the subsequent obtaining of the forming of the double-cavity tube 100 with a thinner tube wall. The injection molding process and the extrusion molding process of the single-cavity tube are mature processes in the prior art, and a designer can flexibly adjust the cavity sizes of the inner cavity tube 10 and the outer cavity tube 20 according to the cavity sizes of the double-cavity tube in actual demands, and the molding quality control is easier to control. The lengths of the inner lumen 10 and the outer lumen 20 are uniform in this embodiment.

Referring again to fig. 11 to 13, fig. 11 is a longitudinal sectional view of the inner tube and the first mandrel in the second embodiment, fig. 12 is a longitudinal sectional view and a transverse sectional view of the inner tube, the first mandrel, the second mandrel in the second embodiment, and fig. 13 is a longitudinal sectional view and a transverse sectional view of the inner tube, the first mandrel, the second mandrel, the outer tube in the present embodiment. Further, in step S1B, the outer cavity tube 20 is sleeved outside the inner cavity tube 10, and the cavity shapes of the inner cavity tube 10 and the outer cavity tube 20 are maintained unchanged through the first mandrel 2 and the second mandrel 3 respectively. Specifically, the outer cavity tube 20 is sleeved outside the inner cavity tube 10, so that two cavities are formed, one cavity is a cavity with a circular cross section inside the inner cavity tube 10, and the other cavity is a cavity with a crescent cross section formed between the outer wall of the inner cavity tube 10 and the inner wall of the outer cavity tube 20. Then, the inner cavity tube 10 is sleeved outside the first mandrel 2, and the first mandrel 2 maintains the shape of the inner cavity tube 10 unchanged. The first mandrel 2, which is sleeved with the inner cavity tube 10, is placed in the accommodating space 31 of the second mandrel 3. The accommodation space 31 communicates with the outer wall of the second spindle 3. And then the outer cavity tube 20 is sleeved outside the second mandrel 3, and the second mandrel 3 maintains the shape of the outer cavity tube 20 unchanged.

Specifically, the first mandrel 2 and the second mandrel 3 are both made of stainless steel. Wherein the cross section of the first mandrel 2 is circular. The outer diameter of the first mandrel 2 is matched with the inner diameter of the inner cavity pipe 10, the inner cavity pipe 10 is sleeved outside the first mandrel 2 along the axis direction, the outer wall of the first mandrel 2 is attached to the inner wall of the inner cavity pipe 10, and accordingly the first mandrel 2 supports the inner cavity pipe 10 to maintain the shape of the inner cavity pipe 10 unchanged. The length of the first mandrel 2 in this embodiment is greater than the lengths of the inner cavity tube 10 and the outer cavity tube 20, and when the inner cavity tube 10 is sleeved outside the first mandrel 2, both ends of the first mandrel 2 leak into the inner cavity tube 10. The cross section of the second mandrel 3 is crescent-shaped. In this embodiment, the cross section of the accommodating space 31 is circular arc, the accommodating space 31 is arranged on the second mandrel 3 along the axis direction, and the accommodating space 31 is communicated with the outer wall of the second mandrel 3 along the axis direction. The cross section of the second mandrel 3 integrally matched with the accommodating space 31 is approximately circular, and the circular diameter is matched with the inner diameter of the outer cavity tube 20, so that the outer cavity tube 20 can be sleeved outside the second mandrel 3 and attached to the outer wall of the second mandrel 3. The circular arc-shaped diameter of the cross section of the accommodating space 31 is matched with the circular diameter of the cross section of the first mandrel 2, so that the first mandrel 2 can be accommodated in the accommodating space 31 along the axial direction. The cross section of the first mandrel 2 matched with the second mandrel 3 is circular. In this embodiment, the length of the second mandrel 3 is greater than the lengths of the inner cavity tube 10 and the outer cavity tube 20, the length of the first mandrel 2 is greater than the length of the second mandrel 3, when the first mandrel 2 sleeved with the inner cavity tube 10 is placed in the accommodating space 31 along the axial direction, the inner cavity tube 10 is completely accommodated in the accommodating space 31, and two ends of the first mandrel 2 are respectively leaked at two opposite ends of the second mandrel 3. The outer cavity tube 20 is sleeved outside the second mandrel 3 along the axis direction, and the second mandrel 3 supports the outer cavity tube 20 so as to maintain the shape of the outer cavity tube 20 unchanged. Because the outer cavity tube 20 and the inner cavity tube 10 are flexible tubes, the outer cavity tube 20 and the inner cavity tube 10 are supported only by the cooperation of the second mandrel 3 and the first mandrel 2, so that the shapes of the outer cavity tube 20 and the inner cavity tube 10 are kept unchanged, the subsequent welding action of the outer cavity tube 20 and the inner cavity tube 10 and the smooth forming of the double cavity tube can be ensured, and the forming quality of the double cavity tube 100 is ensured.

In step S1C, after the outer cavity tube 20 is sleeved outside the second mandrel 3, the inner wall of the outer cavity tube 20 and the outer wall of the inner cavity tube 10 are mutually attached along the axis direction, so that a wall attachment portion is formed along the axis direction, so that the inner wall of the outer cavity tube 20 and the outer wall of the inner cavity tube 10 can be welded later. In a specific application, the first mandrel 2 can be controlled through the mechanical structure of the outer wall, so that the first mandrel 2 can move along the radial direction, and when the diameter of the first mandrel 2 is smaller than that of the accommodating space 31, the inner cavity tube 10 sleeved outside the first mandrel 2 and the outer cavity tube 10 sleeved outside the second mandrel 3 can be mutually attached by moving the radial direction of the first mandrel 2.

In this way, by matching the first mandrel 2 and the second mandrel 3, the shapes of the inner cavity tube 10 and the outer cavity tube 20 can be maintained unchanged respectively, and the outer wall of the inner cavity tube 10 and the inner wall of the outer cavity tube 20 can be firmly attached together, so that the outer wall of the subsequent inner cavity tube 10 and the inner wall of the outer cavity tube 20 can be welded conveniently, and the quality of the formed double-cavity tube 100 is ensured.

In step S2, the specific process of sleeving the reinforcing ribs 30 outside the outer cavity tube 20 is identical to the specific process of sleeving the reinforcing ribs 30 outside the dual cavity tube 100 in the first embodiment, and will not be described again here. The specific procedures in steps S3 and S4 are identical to those in steps S3 and S4 in the first embodiment, and will not be described here again.

In step S5, in order to weld the external fixation tube 40 to the reinforcing rib 30 and the outer wall of the double lumen tube, the inner lumen tube 10 of the wall-attached portion is also welded to the external lumen tube 20. When the heating device is specifically used to heat the first heat-shrinkable sleeve 1, specific heating time and heating temperature can be appropriately increased based on step S5 in the first embodiment, and the limitation of welding the outer wall of the inner cavity tube 10 and the inner wall of the outer cavity tube 20 is limited, which is not repeated here.

Example III

Referring to fig. 14 and 15, fig. 14 is a flowchart of step S1 in the third embodiment, and fig. 15 is a schematic structural diagram of an inner cavity tube, an outer cavity tube, a second heat-shrinkable tube, a reinforcing rib, an outer fixing tube, a first heat-shrinkable tube, a first mandrel and a second mandrel in the third embodiment. The forming process of the reinforced dual-cavity tube in this embodiment is different from that in the second embodiment in that: in step S1C of step S1, the inner wall of the outer lumen 20 is adhered to the outer wall of the inner lumen 10 to form an wall-adhered portion, and then the method further comprises:

S1D, the second heat-shrinkable sleeve 4 is sleeved outside the outer cavity tube 20.

S1E, heating the second heat-shrinkable sleeve 4 to enable the second heat-shrinkable sleeve 4 to shrink and cover the outer cavity tube 20, and enabling the inner cavity tube 10 of the wall attachment part to be welded with the outer cavity tube 20.

S1F, after the second heat-shrinkable sleeve 4 is cooled, tearing off the heat-shrinkable second heat-shrinkable sleeve 4 to obtain the double-cavity tube 100.

The process of forming the reinforced dual-lumen tube in this embodiment is to weld the inner lumen tube 10 and the outer lumen tube 20 to form the dual-lumen tube 100 with a thinner wall thickness, and then support the dual-lumen tube at the welding rib 30 to obtain the reinforced dual-lumen tube. The inner cavity tube 10 and the outer cavity tube 20 are welded into the double cavity tube 100, and then the reinforcing ribs 30 and the double cavity tube 100 are welded, so that the whole welding process is divided into two stages, the control of the welding process can be facilitated, and the quality control of the finally formed reinforced double cavity tube is facilitated.

Referring again to fig. 16 and 17, fig. 16 is a longitudinal sectional view and a transverse sectional view of the inner lumen tube, the first mandrel, the second mandrel, the outer lumen tube, the second heat shrinkable sleeve according to the third embodiment, and fig. 17 is a transverse sectional view of the double lumen tube according to the third embodiment. Further, in step S1D, the material and shape of the second heat shrink 4 are identical to those of the first heat shrink 1. The inner diameter of the second heat-shrinkable sleeve 4 is larger than the inner diameter of the outer cavity tube 20, and the length of the second heat-shrinkable sleeve 4 is slightly larger than the length of the outer cavity tube 20, so that the outer cavity tube 20 can be fully coated after the second heat-shrinkable sleeve 4 is subjected to heat shrinkage. The second heat-shrinkable sleeve 4 is sleeved outside the outer cavity tube 20 along the axis, and a gap is reserved between the second heat-shrinkable sleeve 4 and the outer cavity tube 20.

In step S1E, the second heat shrinkable sleeve 4 is heated, in particular, with a heating device, for example, a heat gun. In order to improve the heating stability, a customized heating device may be adopted to provide a stable heating body, the length of the heating body is matched with the length of the wall attachment, the second heat-shrinkable sleeve 4 is heated from the outside in the direction facing the wall attachment, and the specific heating time and heating temperature are determined based on the actual requirement, and the inner cavity tube 10 and the outer cavity tube 20 of the wall attachment can be welded to limit. The heating temperature in this embodiment is between 150 and 250 degrees celsius, with a preferred heating temperature of 200 degrees celsius. The heating time is between 2 and 5 minutes, preferably 3 minutes. In the specific application, the heating time can be reduced if the heating temperature is higher according to the actual situation, and vice versa.

As the heating proceeds, the heated second heat shrinkage sleeve 4 shrinks inwards and wraps the outer cavity tube 20, so that the outer wall of the inner cavity tube 10 of the wall attachment portion is tightly attached to the inner wall of the outer cavity tube 20. The inner cavity tube 10 and the outer cavity tube 20 which are made of polyurethane have the same melting point, and the outer wall of the inner cavity tube 10 and the inner wall of the outer cavity tube 20 are melted simultaneously along with the continuous heating, so that the outer wall of the inner cavity tube 10 and the inner wall of the outer cavity tube 20 are welded together. In addition, the inner cavity tube 10 and the outer cavity tube 20 are heated and melted through the second heat shrinkage sleeve 4, and the heating is not directly applied to the inner cavity tube 10 and the outer cavity tube 20, so that the inner cavity tube 10 and the outer cavity tube 20 are protected, and the forming quality of the double-cavity tube 100 is ensured. Moreover, the inward shrinkage force of the second heat shrinkage bush 4 acts on the outer wall of the inner cavity tube 10 and the inner wall of the outer cavity tube 20, which are being melted, so that the welding of the outer wall of the power-assisted inner cavity tube 10 and the inner wall of the outer cavity tube 20 is accelerated, and the welding effect is ensured.

In step S1F, after the second heat-shrinkable sleeve 4 is cooled, the heat-shrinkable second heat-shrinkable sleeve 4 is torn off. In this embodiment, natural cooling may be adopted, or accelerated cooling may be adopted by a cooling device, such as air-blowing accelerated cooling. After cooling to room temperature, the second heat-shrinkable sleeve 4 after heat shrinkage can be torn off, so that the double-cavity tube 100 with a thinner wall thickness is obtained.

The steps S2 to S5 of the shaping process of the reinforced dual-lumen tube in this embodiment are identical to the steps S2 to S5 in the first embodiment, and are not repeated here.

Example IV

The molding process of the reinforced dual-lumen tube in the embodiment is different from that in the third embodiment in that: in step S1E, the wall-attached inner lumen 10 and outer lumen 20 are welded, including:

the ends of the lumen tube 10 and the outer lumen tube 20 distal to the wall mount are not welded. It will be appreciated that the inner lumen 10 and outer lumen 20 of the dual lumen tube need to be separately connected to external connectors after formation to enable use in a medical cannula. In this embodiment, the ends of the inner cavity tube 10 and the outer cavity tube 20 far from the wall attachment are not welded, that is, the outer wall of the inner cavity tube 10 near the middle part of the wall attachment is welded with the inner wall of the outer cavity tube 20, and the outer walls of the inner cavity tube 10 and the inner wall of the outer cavity tube 20 at the opposite ends of the wall attachment are not welded, so that the inner cavity tube 10 and the outer cavity tube 20 at the middle part of the formed double cavity tube are integrated, and the inner cavity tube 10 and the outer cavity tube 20 at the two ends of the double cavity tube are separated, so as to facilitate the convenience when the subsequent connection joint is connected with the inner cavity tube 10 and the outer cavity tube 20 respectively. When the heat-shrinkable sleeve is specifically applied, the position and the length of the wall-adhering portion are preset, so that one end of the double-cavity tube is not welded, or both ends of the double-cavity tube are not welded, the heat-shrinkable sleeve is not limited, and then in the step S1E, only the middle section of the second heat-shrinkable sleeve 1 is heated, and the heat-shrinkable sleeve is not repeated here.

In another embodiment, in order to achieve the effect of not welding the end of the inner tube 10 and the outer tube 20 away from the wall-attached portion, in step S1E, a circular arc-shaped spacer (not shown in the figure) is provided at the end of the accommodating space 31 of the second mandrel 3, so that the cross section of the second mandrel 3 near the middle part is crescent-shaped, while the cross section of the second mandrel 3 near the end is circular, and the circular arc-shaped spacer is located between the inner tube 10 and the outer tube 20, and when welding, the circular arc-shaped spacer blocks the end of the inner tube 10 and the outer tube 20 away from the wall-attached portion from welding, thereby obtaining a double-lumen tube with non-welded end. In specific application, according to practical situations, an arc-shaped spacer can be arranged at one end of the accommodating space 31 of the second mandrel 3, and also can be arranged at two ends of the accommodating space 31 of the second mandrel 3.

In conclusion, the reinforcing ribs are welded to the outer wall of the double-cavity tube through the outer fixed tube, so that the reinforcing ribs can provide stable support for the double-cavity tube, and the supporting and reinforcing effects of the reinforcing ribs are guaranteed. In addition, through the butt fusion protection of first heat shrinkage bush, can avoid direct heating to influence the outward appearance that adds strong two-chamber pipe, and the inward shrinkage force of first heat shrinkage bush can promote the strengthening rib butt fusion process to guarantee the butt fusion quality of strengthening rib. Moreover, a novel double-cavity tube forming process is provided, wherein an inner cavity tube and an outer cavity tube are obtained respectively, and then the double-cavity tube is obtained in a welding mode of the inner cavity tube and the outer cavity tube, the wall thickness of the formed double-cavity tube is thinner, the effective utilization area of a cavity is larger, the utilization rate of the cavity is higher, and the double-cavity tube forming process is convenient to apply in the field of medical intubation. In addition, the molding process of the reinforced double-cavity tube provides a novel double-cavity tube molding mode on the basis of the current mature application technology, the cavity of the double-cavity tube can be adjusted according to actual requirements, molding quality control is easier to control, and cost in a research and development stage is lower.

The above are merely embodiments of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present invention, should be included in the scope of the claims of the present invention.

Claims

1. The molding process of the reinforced double-cavity tube is characterized by comprising the following steps of:

sleeving the reinforcing ribs outside the double-cavity tube;

sleeving the outer fixed pipe outside the reinforcing rib;

sleeving a first heat-shrinkable sleeve outside the outer fixed pipe;

heating the first heat-shrinkable sleeve, so that the first heat-shrinkable sleeve is shrunk and coated on the outer fixed pipe, and the outer fixed pipe is welded on the reinforcing rib and the outer wall of the double-cavity pipe;

wherein obtaining a dual-lumen tube and maintaining the shape of the dual-lumen tube unchanged comprises:

respectively obtaining an inner cavity tube and an outer cavity tube;

the outer cavity pipe is sleeved outside the inner cavity pipe, and the cavity shapes of the inner cavity pipe and the outer cavity pipe are respectively maintained unchanged through a first mandrel and a second mandrel; the cross section of the first mandrel is circular; the cross section of the second mandrel is crescent; the second mandrel is provided with an accommodating space; the first mandrel can be accommodated in the accommodating space;

2. The process for forming a reinforced dual-lumen tube according to claim 1, wherein obtaining a dual-lumen tube and maintaining the shape of the dual-lumen tube unchanged comprises:

directly extruding the double-cavity tube through an extrusion molding process;

3. The process for forming the reinforced double-cavity tube according to claim 1, wherein the reinforcing ribs are sleeved outside the outer cavity tube; and heating the first heat-shrinkable sleeve, so that the first heat-shrinkable sleeve is shrunk and coated on the outer fixed pipe, and the outer fixed pipe is welded on the reinforcing rib and the outer wall of the double-cavity pipe, and the inner cavity pipe and the outer cavity pipe of the wall attaching part are welded at the same time.

4. A process for forming a reinforced dual lumen tube as set forth in claim 3 wherein said inner wall of said outer lumen tube is affixed to said outer wall of said inner lumen tube to form a wall affixed portion, and further comprising:

sleeving a second heat-shrinkable sleeve outside the outer cavity pipe;

heating the second heat-shrinkable sleeve to shrink and wrap the second heat-shrinkable sleeve on the outer cavity pipe, and welding the inner cavity pipe of the wall attachment part with the outer cavity pipe;

5. The process for forming a reinforced dual-lumen tube according to claim 2, wherein the inner lumen tube and the outer lumen tube are obtained respectively, comprising: the inner cavity tube and the outer cavity tube are obtained through an injection molding process; or the inner cavity tube and the outer cavity tube are obtained through an extrusion molding process.

6. The process of any one of claims 1-5, wherein welding the inner lumen of the wall mount to the outer lumen comprises:

the ends of the inner lumen tube and the outer lumen tube distal from the wall mount are not welded.

7. The process for forming a reinforced dual-lumen tube as set forth in any one of claims 1 to 5, wherein said external fixation tube is welded to said reinforcing rib and said dual-lumen tube outer wall, and further comprising:

after the first heat-shrinkable sleeve is cooled, tearing off the heat-shrinkable sleeve;

8. A reinforced dual-lumen tube formed by the process of forming a reinforced dual-lumen tube as set forth in any one of claims 1-7.