CN112643990A

CN112643990A - Reinforced double-cavity tube and its forming process

Info

Publication number: CN112643990A
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: 2021-04-13
Anticipated expiration: 2040-11-30
Also published as: CN112643990B

Abstract

The invention discloses a molding process of a reinforced double-cavity tube, which comprises the following steps: obtaining a double-cavity tube and keeping the shape of the double-cavity tube unchanged; sleeving the reinforcing ribs outside the double-cavity pipe; sleeving the external fixed pipe outside the reinforcing rib; sleeving a first heat-shrinkable sleeve outside the outer fixed pipe; heating the first heat-shrinkable sleeve to shrink and wrap the first heat-shrinkable sleeve on the outer fixed pipe, and welding the outer fixed pipe on the outer walls of the reinforcing ribs and the double-cavity pipe; the invention also discloses a reinforced double-cavity tube. This application is through outer solid pipe with the strengthening rib butt fusion in the outer wall of double-chamber pipe for the strengthening rib can provide stable support for the double-chamber pipe, has guaranteed the support of strengthening rib and has strengthened the effect.

Description

Reinforced double-cavity tube and its forming process

Technical Field

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

Background

Double lumen tubes are increasingly used in industries such as industry and medical treatment. Referring to FIG. 1, FIG. 1 is a schematic cross-sectional view of a prior art reinforced dual lumen tube. The reinforced double-cavity tube comprises an inner cavity tube 10, an outer cavity tube 20 and a reinforcing rib 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 rib 30 is sleeved outside the outer cavity tube 20, and the reinforcing rib 30 is generally a spring. When the double-cavity tube is particularly applied to the intubation tube used in the medical industry, the two cavities of the double-cavity tube are respectively communicated with the artery and the vein of the human body, thereby completing the treatment process by matching with medical instruments. The reinforcing ribs 30 reinforce the inner lumen tube 10 and the outer lumen tube 20 to support the two lumens of the double lumen tube, so as to ensure smooth blood flow in the double lumen tube, and also protect the double lumen tube, thereby ensuring smooth application of the medical intubation tube. At present, for the preparation process of the reinforced double-cavity tube, the reinforcing rib is directly sleeved outside the double-cavity tube, and the reinforcing rib and the double-cavity tube can move relatively, which can affect the supporting and reinforcing effect of the reinforcing rib.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a forming 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 keeping the shape of the double-cavity tube unchanged;

sleeving the reinforcing ribs outside the double-cavity pipe;

sleeving the external fixed pipe outside the reinforcing rib;

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

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

According to one embodiment of the present invention, obtaining a dual lumen tube and maintaining the shape of the dual lumen tube, comprises:

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

the shapes of the two cavities of the double-cavity tube are kept unchanged by the first mandrel and the second mandrel respectively.

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

sleeving the outer cavity tube outside the inner cavity tube, and respectively maintaining the shapes of the cavities of the inner cavity tube and the outer cavity tube unchanged through a first mandrel and a second mandrel;

the inner wall of the outer cavity pipe is attached to the outer wall of the inner cavity pipe to form a wall attaching part; the cavity of the outer cavity tube and the cavity of the inner cavity tube are matched to form two cavities of the double cavity tube.

According to one embodiment of the invention, the reinforcing rib is sleeved outside the outer cavity tube; and heating the first heat-shrinkable sleeve to shrink and wrap the first heat-shrinkable sleeve in the outer solid pipe, and welding the outer solid pipe to the reinforcing rib and the outer wall of the double-cavity pipe, and welding the inner cavity pipe and the outer cavity pipe of the wall pasting part.

According to an embodiment of the present invention, the method for forming a wall-attached portion by attaching an inner wall of an outer lumen to an outer wall of an inner lumen, further comprises:

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

heating the second heat-shrinkable sleeve to shrink and wrap the second heat-shrinkable sleeve in the outer cavity tube, and welding the inner cavity tube of the wall pasting part with the outer cavity tube;

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

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

According to an embodiment of the present invention, a method of welding an inner lumen tube of a wall patch to an outer lumen tube includes:

the end parts of the inner cavity tube and the outer cavity tube far from the wall patch part are not welded.

According to an embodiment of the invention, the first mandrel is circular in cross-section; 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 outer fixing tube is welded to the reinforcing rib and the outer wall of the double lumen tube, and then further comprises:

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

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

The reinforced double-cavity tube is formed by adopting the reinforced double-cavity tube forming process.

The beneficial effect of this application lies in: the reinforcing ribs are welded on the outer wall of the double-cavity tube through the outer fixing tube, so that the reinforcing ribs can provide stable support for the double-cavity tube, and the support and reinforcement effect of the reinforcing ribs is guaranteed. In addition, through the butt fusion protection of first heat shrinkage bush, can avoid direct heating to influence the outward appearance that adds the strong type double lumen pipe, and the inside shrink power of first heat shrinkage bush can promote the strengthening rib butt fusion process to guarantee the butt fusion quality of strengthening rib. And moreover, a novel double-cavity tube forming process is also provided, wherein the inner cavity tube and the outer cavity tube are obtained respectively, and then the double-cavity tube is obtained by welding the inner cavity tube and the outer cavity tube, so that the wall thickness of the formed double-cavity tube is thinner, the effective utilization area of the cavity is larger, the utilization rate of the cavity is higher, and the application in the field of medical intubation is facilitated. In addition, the forming process of the reinforced double-cavity tube provides a new double-cavity tube forming mode on the basis of the current mature application technology, the cavity of the double-cavity tube can be adjusted according to the actual requirement, the forming quality control is easier to control, and the cost in the 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 embodiment(s) of the application and together with the description serve to explain the application and not to limit 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 one embodiment;

FIG. 3 is a schematic structural view of a middle dual lumen tube, a stiffener, an outer solid tube, a first heat shrink, a first mandrel, and a second mandrel according to an embodiment;

FIG. 4 is a longitudinal cross-sectional view and a transverse cross-sectional view of a dual lumen tube and a second mandrel of one embodiment;

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

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

FIG. 7 is a longitudinal cross-sectional view and a transverse cross-sectional view of a dual lumen tube, a first mandrel, a second mandrel, a reinforcing rib, and an outer fixation tube according to one embodiment;

FIG. 8 is a longitudinal cross-sectional view and a transverse cross-sectional view of a first heat shrink sleeve, a first mandrel, a second mandrel, a reinforcing rib, an outer solid tube, and a double lumen tube according to one embodiment;

FIG. 9 is a flowchart showing step S1 in the second embodiment;

FIG. 10 is a schematic structural view of an inner lumen tube, an outer lumen tube, a reinforcing rib, an outer fixing tube, a first heat shrinkable sleeve, a first mandrel and a second mandrel according to a second embodiment;

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

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

FIG. 13 is a longitudinal cross-sectional view and a transverse cross-sectional view of the inner lumen, the first mandrel, the second mandrel, the outer lumen, in accordance with this embodiment;

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

FIG. 15 is a schematic structural view of an inner lumen tube, an outer lumen tube, a second heat shrinkable sleeve, a reinforcing rib, an outer fixing tube, a first heat shrinkable sleeve, a first mandrel and a second mandrel according to a third embodiment;

FIG. 16 is a longitudinal cross-sectional view and a transverse cross-sectional view of the inner lumen tube, the first mandrel, the second mandrel, the outer lumen tube, the second heat shrink, according to one embodiment;

FIG. 17 is a transverse cross-sectional view of a dual lumen tube of the third embodiment.

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

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

In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

For further understanding of the contents, features and effects of the present invention, the following embodiments are enumerated in conjunction with the accompanying drawings, and the following detailed description is given:

example one

Referring to fig. 2, fig. 2 is a flow chart of a forming process of the reinforced double-cavity tube in the first embodiment, and fig. 3 is a schematic structural diagram of the double-cavity tube, the reinforcing rib, the outer fixing tube, the first heat shrinkable sleeve, 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 keeping the shape of the double-cavity tube 100 unchanged.

S2, the reinforcing rib 30 is sleeved outside the double-cavity tube 100.

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

S4, the first heat shrinkable tube 1 is sleeved outside the outer fixed tube 40.

S5, heating the first heat shrinkable sleeve 1 to shrink the first heat shrinkable sleeve 1 around the outer solid tube 40, and welding the outer solid tube 40 to the outer walls of the reinforcing ribs 30 and the double lumen tube 100.

The reinforcing rib 30 is welded to the outer wall of the double-cavity tube 100 through the outer fixing tube 40, so that the reinforcing rib 30 can provide stable support for the double-cavity tube 100, and the support and reinforcement effect of the reinforcing rib 30 is ensured. In addition, through the welding protection of first heat-shrinkable sleeve 1, can avoid direct heating to influence the outward appearance that adds the intensive double-lumen tube 100, and the inward contractility of first heat-shrinkable sleeve 1 can promote strengthening rib 30 welding process to guarantee strengthening rib 30's welding quality.

Referring also to fig. 4 and 5, fig. 4 is a longitudinal cross-sectional view and a transverse cross-sectional view of the dual lumen tube and the second mandrel of the first embodiment, and fig. 5 is a longitudinal cross-sectional view and a transverse cross-sectional view of the dual lumen tube, the first mandrel and the second mandrel of the first embodiment. Further, in step S1, obtaining the dual lumen tube 100 and maintaining the shape of the dual lumen tube 100, comprising:

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

S1b, the shape of the two cavities of the dual lumen tube 100 is maintained 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 mandrel 3 has a receiving space 31, and the first mandrel 2 is received in the receiving space 31. Specifically, the first mandrel 2 and the second mandrel 3 are both made of stainless steel. The accommodating space 31 is provided with the second mandrel 3 along the axial direction, the accommodating space 31 is communicated with the outer wall of the second mandrel 3 along the axial direction, the cross section of the accommodating space 31 is approximately elliptical, and thus the cross section of the second mandrel 3 is crescent-shaped. 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 double lumen tube 100 has two cavities which do not interfere with each other along the axial direction, wherein one of the cavities has a circular cross section which is matched with the circular cross section of the first mandrel 2; the cross section of the other cavity is crescent-shaped, the crescent-shaped cavity is matched with the crescent-shaped cross section of the second mandrel 3, the crescent-shaped cavity of the double-cavity tube 100 covers the circular cavity, and the outer edge of the cross section of the whole double-cavity tube 100 is circular. The second mandrel 3 is firstly inserted into the crescent-shaped cavity of the double-cavity tube 100 along the axis direction, then the first mandrel 2 is inserted into the circular cavity of the double-cavity tube 100, of course, the first mandrel 2 can be inserted first and then the second mandrel 3 can be inserted, and after the first mandrel 2 and the second mandrel 3 are both inserted, both ends of the first mandrel 2 and both ends of the second mandrel 3 are both leaked at both ends of the double-cavity tube 100. The first mandrel 2 and the second mandrel 3 which are adaptive to the shapes can be matched to support the circular cavity and the crescent cavity of the double-cavity tube 100, so that the shapes of the two cavities of the double-cavity tube 100 are kept unchanged, the influence of subsequent welding on the cavity shape of the double-cavity tube 100 is avoided, the smooth forming of the reinforced double-cavity tube is ensured, and the forming quality of the reinforced double-cavity tube is also ensured.

Referring also to FIG. 6, FIG. 6 is a longitudinal cross-sectional view and a transverse cross-sectional view of the dual lumen tube, the first mandrel, the second mandrel, and the reinforcing ribs of the first embodiment. Further, in step S2, the reinforcing ribs 30 are sleeved outside the dual lumen tube 100. Specifically, the stiffener 30 is a spring, and in this embodiment, is 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 axis 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 the length of the dual-chamber tube 100, and after the reinforcing rib 30 is sleeved on the dual-chamber tube 100, two ends of the dual-chamber tube 100 leak from two ends of the reinforcing rib 30.

Referring also to FIG. 7, FIG. 7 is a longitudinal cross-sectional view and a transverse cross-sectional view of the dual lumen tube, the first mandrel, the second mandrel, the reinforcing ribs, and the outer fixation tube of the first embodiment. Further, in step S3, the outer fixing tube 40 is fitted over the reinforcing rib 30. Specifically, the outer fixing tube 40 is a thin-walled tube made of polyurethane, the inner diameter of the thin-walled tube is matched with the outer diameter of the reinforcing rib 30, the reinforcing tube 40 is sleeved outside the reinforcing rib 30 along the axis direction, and the inner wall of the reinforcing tube 40 is attached to the outer wall of the reinforcing rib 30. The length of the reinforcement pipe 40 is the same as the length of the reinforcing bars 30 in this embodiment, so that the reinforcement pipe 40 can completely cover the outer wall of the reinforcing bars 30. And the reinforcing tube 40 is selected to be the same material as the dual chamber tube 100 such that the melting point of the reinforcing tube 40 is the same as that of the dual chamber tube 100, thereby facilitating the fusion of the reinforcing tube 40 with the outer wall of the dual chamber tube 100.

Referring also to FIG. 8, FIG. 8 is a longitudinal cross-sectional view and a transverse cross-sectional view of the dual lumen tube, the first mandrel, the second mandrel, the reinforcing ribs, the outer solid tube, and the first heat shrink tubing, according to one embodiment. Further, in step S4, the first heat shrinkable tube 1 is sleeved outside the outer fixing tube 40. Specifically, the material of the first heat shrinkable tube 1 is one of EVA, FEP, PE, and PTFE. When heated, the first heat shrink tubing 1 will shrink inwardly. The inner diameter of the first heat-shrinkable tube 1 is larger than the outer diameter of the reinforcing tube 40, the first heat-shrinkable tube 1 is sleeved outside the reinforcing tube 40 along the axis direction, and a gap is formed between the inner wall of the first heat-shrinkable tube 1 and the outer wall of the reinforcing tube 40. The length of the first heat-shrinkable sleeve 1 is greater than that of the double-cavity tube 100, so that the first heat-shrinkable sleeve 1 can be completely coated outside the double-cavity tube 100 when being heat-shrunk, and the double-cavity tube 100 is comprehensively protected.

In step S5, the first heat-shrinkable sleeve 1 is heated to shrink-wrap the first heat-shrinkable sleeve 1 around the outer tube 40, and the outer tube 40 is welded to the reinforcing rib 30 and the outer wall of the double lumen tube 100. In particular, the first heat shrinkable sleeve 1 can be heated by a heating device, for example, a heat gun. In order to improve the heating stability, a customized heating device, such as a heating furnace, may be used to provide a stable heating space with a height adapted to the length of the outer fixing tube 40. The heating device heats the outer wall of the first heat-shrinkable sleeve 1 from the circumferential surface, and the specific heating time and heating temperature are based on actual requirements, and the outer fixed tube 40 is welded to the outer walls of the reinforcing rib 30 and 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 specific application, the heating time can be set according to actual conditions, and if the heating temperature is higher, the heating time is reduced, and vice versa.

Along with the heating, the heated first heat-shrinkable sleeve 1 can shrink inwards and cover the outer fixed tube 40, the inner wall of the outer fixed tube 40 is tightly attached to the outer wall of the reinforcing rib 30, and then the 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 both made of polyurethane have the same melting point, as the heating is continued, the outer walls of the outer solid tube 40 and the double-cavity tube 100 can be melted at the same time, so that the inner wall of the outer solid tube 40 and the outer wall of the double-cavity tube 100 are welded together, and naturally, the reinforcing rib 30 between the inner wall of the outer solid tube 40 and the outer wall of the double-cavity tube 100 forms a welding state with the outer solid tube 40 and the double-cavity tube 100 respectively, so that the reinforcing rib 30 and the double-cavity tube 100 form a whole body to form stable support for the double-cavity tube 100, the support reinforcing effect of the reinforcing rib 30 is ensured, the quality of the reinforced double-cavity tube is ensured, the outer wall thickness of the double-cavity tube 100 can be further thickened by the welded outer solid tube 40, and the quality of the. Furthermore, the heat welding of the outer fixed tube 40 and the double lumen tube 100 is performed through the first heat shrinkable sleeve 1, and the heat is not directly applied to the outer fixed tube 40 and the double lumen tube 100, thereby protecting the outer fixed tube 40 and the double lumen tube 100 and further improving the quality of the final reinforced double lumen tube. Moreover, the inward contraction force of the first heat-shrinkable sleeve 1 acts on the outer solid tube 40 and the double-lumen tube 100 which are being welded, so that the welding process of the power-assisted outer solid tube 40 and the double-lumen tube 100 is accelerated, the welding effect is ensured, and the quality of the reinforced double-lumen tube is further improved.

Referring to fig. 2 again, in the process for forming the reinforced double-lumen tube in the present embodiment, in step S5, the outer fixing tube 40 is welded to the reinforcing rib 30 and the outer wall of the double-lumen tube, and then the method further includes:

s6, cooling the first heat shrinkable sleeve 1, and tearing off the heat shrinkable sleeve 1. In the present embodiment, natural cooling may be used, or accelerated cooling may be performed using a cooling device, such as air-blast accelerated cooling. And cooling to room temperature to tear off the heat-shrinkable first heat-shrinkable sleeve 1.

And S7, respectively extracting the first mandrel 2 and the second mandrel 3 to obtain the reinforced double-cavity tube. Specifically, the extracting action of the first mandrel 2 and the second mandrel 3 can be performed by using an existing extracting device, which is not described herein again.

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 lumen, the outer lumen, the reinforcing ribs, the outer fixing tube, the first heat shrinkable sleeve, the first mandrel, and the second mandrel in the second embodiment. The forming process of the reinforced double-cavity tube in the embodiment is different from that in the first embodiment in that:

in step S1, obtaining the dual lumen tube 100 and maintaining the shape of the dual lumen tube 100, comprising the sub-steps of:

S1A, obtaining the inner lumen tube 10 and the outer lumen tube 20, respectively.

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

S1C, attaching the inner wall of the outer cavity tube 20 to the outer wall of the inner cavity tube 10 to form a wall attaching part; the cavity of the outer lumen tube 20 and the cavity of the inner lumen tube 10 cooperate to form the two cavities of the dual lumen tube 100.

In step S2, the reinforcing ribs 30 are sleeved outside the outer lumen tube 20.

In step S5, the first heat shrinkable sleeve 1 is heated to shrink the first heat shrinkable sleeve 1 around the outer tube 40, and the outer tube 40 is welded to the rib 30 and the outer wall of the double lumen tube, and the inner tube 10 and the outer tube 20 of the wall attachment portion are welded to each other.

It will be appreciated that wall thickness control of the dual lumen tube is also critical, particularly in applications in the field of medical cannulae, because the thinner the tube wall, the greater the blood flow through the cannula at the same time, while the extrusion of the dual lumen tube 100 through the extruder is limited by the extrusion die cavity, resulting in a thicker wall thickness of the dual lumen tube 100, which affects the effective area and efficiency of the cavity of the dual lumen tube 100. The reinforced double-cavity tube forming process in the embodiment firstly obtains the inner cavity tube 10 and the outer cavity tube 20 respectively, and then obtains the double-cavity tube 100 by welding the inner cavity tube 10 and the outer cavity tube 20, so that the wall thickness of the formed double-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 double-cavity tube forming process is convenient to apply in the field of medical intubation.

Preferably, in step S1A, the inner lumen tube 10 and the outer lumen tube 20 are obtained separately. Specifically, the inner lumen tube 10 and the outer lumen tube 20 are obtained by an injection molding process, or the inner lumen tube 10 and the outer lumen tube 20 are obtained by an extrusion molding process. The inner lumen tube 10 and the outer lumen tube 20 in this embodiment are thin-walled tubes made of polyurethane. In a specific application, the polyurethane thin-walled tube may be prepared by an injection molding process, for example, the polyurethane thin-walled tube is injection molded by an injection molding machine, and in the injection molding process, the wall thickness of the thin-walled tube may be limited by a mold, so that a thinner tube wall can be obtained according to actual conditions. Similarly, the thin-walled tube of polyurethane material can also be prepared by an extrusion molding process, such as extruding the thin-walled tube of polyurethane material through an extruder, because the inner lumen tube 10 and the outer lumen tube 20 are single-lumen, and the extrusion die cavity of the extruder has a smaller limit than that of the dual-lumen tube 100, a relatively thinner thin-walled tube of single lumen can be obtained. In this embodiment, the obtaining of the inner and outer

tubular cavities

10 and 20 in the step S1A lays a foundation for the subsequent formation of the dual-lumen tube 100 with a thinner wall. The injection molding process and the single-cavity tube extrusion molding process are mature processes in the prior art, so that a designer can flexibly adjust the sizes of the cavities of the inner cavity tube 10 and the outer cavity tube 20 according to the actual requirements of the sizes of the cavities of the double-cavity tubes, and the control of the molding quality is easier to control. The inner lumen 10 and the outer lumen 20 are of uniform length in this embodiment.

Referring also to fig. 11 to 13, fig. 11 is a longitudinal sectional view of the inner lumen and the first mandrel according to the second embodiment, fig. 12 is a longitudinal sectional view and a transverse sectional view of the inner lumen, the first mandrel and the second mandrel according to the second embodiment, and fig. 13 is a longitudinal sectional view and a transverse sectional view of the inner lumen, the first mandrel, the second mandrel, the outer lumen according to the first embodiment. Further, in step S1B, the outer lumen 20 is sleeved outside the inner lumen 10, and the cavity shapes of the inner lumen 10 and the outer lumen 20 are maintained by the first mandrel 2 and the second mandrel 3, respectively. Specifically, the outer lumen tube 20 is sleeved outside the inner lumen tube 10 to form two cavities, one is a cavity with a circular cross section inside the inner lumen tube 10, and the other is a cavity with a crescent cross section formed between the outer wall of the inner lumen tube 10 and the inner wall of the outer lumen tube 20. Then, the inner lumen 10 is sleeved outside the first mandrel 2, and the shape of the inner lumen 10 is maintained by the first mandrel 2. The first mandrel 2 with the inner lumen 10 is then placed in the receiving space 31 of the second mandrel 3. The receiving space 31 communicates with the outer wall of the second spindle 3. Then the outer lumen tube 20 is sleeved outside the second mandrel 3, and the second mandrel 3 maintains the shape of the outer lumen tube 20.

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 tube 10, the inner cavity tube 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 tube 10, and therefore the inner cavity tube 10 is supported by the first mandrel 2, and the shape of the inner cavity tube 10 is kept 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, two ends of the first mandrel 2 leak out of 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 opened in the second spindle 3 along the axial direction, and the accommodating space 31 is communicated with the outer wall of the second spindle 3 along the axial direction. The cross section of the second mandrel 3 integrally matched with the accommodating space 31 is approximately circular, and the diameter of the circular cross section 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 receiving space 31 is adapted to the circular diameter of the cross section of the first mandrel 2, so that the first mandrel 2 can be received in the receiving 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, after 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 respectively leak from two opposite ends of the second mandrel 3. The outer lumen 20 is sleeved outside the second mandrel 3 along the axial direction, and the second mandrel 3 supports the outer lumen 20 to maintain the shape of the outer lumen 20. Because the outer lumen tube 20 and the inner lumen tube 10 are both flexible tubes, the outer lumen tube 20 and the inner lumen tube 10 can be supported only by the cooperation of the second mandrel 3 and the first mandrel 2, so that the shapes of the outer lumen tube 20 and the inner lumen tube 10 are kept unchanged, the subsequent fusion welding action of the outer lumen tube 20 and the inner lumen tube 10 and the smooth forming of the double lumen tube can be ensured, and the forming quality of the double lumen tube 100 is ensured.

In step S1C, after the outer lumen 20 is sleeved on the second mandrel 3, the inner wall of the outer lumen 20 and the outer wall of the inner lumen 10 are bonded to each other along the axial direction, so as to form a wall bonding portion along the axial direction, so that the inner wall of the outer lumen 20 and the outer wall of the inner lumen 10 are welded together. In a specific application, the first mandrel 2 can be controlled by the mechanical structure of the outer wall, so that the first mandrel 2 can move in the radial direction, and thus, when the diameter of the first mandrel 2 is smaller than that of the accommodating space 31, the inner lumen 10 sleeved outside the first mandrel 2 and the outer lumen 10 sleeved outside the second mandrel 3 can be attached to each other by moving the radial movement of the first mandrel 2.

Thus, the shapes of the inner cavity tube 10 and the outer cavity tube 20 can be respectively maintained unchanged through the matching of the first mandrel 2 and the second mandrel 3, 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 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 process of sleeving the reinforcing ribs 30 around the outer lumen tube 20 is the same as the process of sleeving the reinforcing ribs 30 around the dual lumen tube 100 in the first embodiment, and will not be described herein again. The specific processes at steps S3 and S4 are identical to those at steps S3 and S4 in the first embodiment, and are not described here again.

In step S5, the inner lumen tube 10 of the wall patch is welded to the outer lumen tube 20 in order to weld the outer fixing tube 40 to the reinforcing ribs 30 and the outer wall of the double lumen tube. When the heating device is specifically used to heat the first heat shrinkable sleeve 1, the specific heating time and heating temperature may be appropriately increased based on step S5 in the first embodiment, which is limited to welding the outer wall of the inner lumen tube 10 and the inner wall of the outer lumen tube 20, and will not be described herein again.

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 lumen, an outer lumen, a second heat-shrinkable sleeve, a reinforcing rib, an outer fixing tube, a first heat-shrinkable sleeve, a first mandrel and a second mandrel in the third embodiment. The forming process of the reinforced double-cavity tube in the embodiment is different from that in the second embodiment in that: in step S1C of step S1, the method further includes the steps of:

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

S1E, heating the second heat shrinkable sleeve 4 to shrink the second heat shrinkable sleeve 4 to cover the outer cavity tube 20, and welding the inner cavity tube 10 of the wall attaching part and the outer cavity tube 20.

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

The reinforced double-lumen tube forming process in this embodiment is to weld the inner lumen tube 10 and the outer lumen tube 20 to form a thin double-lumen tube 100, and then support the thin double-lumen tube on the welding reinforcing ribs 30 to obtain the reinforced double-lumen tube. The inner cavity tube 10 and the outer cavity tube 20 are firstly welded into the double-cavity tube 100, and then the reinforcing ribs 30 are welded with the double-cavity tube 100, so that the whole welding process is divided into two stages, the control of the welding process is convenient, and the quality control of the finally formed reinforced double-cavity tube is convenient.

Referring also to fig. 16 and 17, fig. 16 is a longitudinal cross-sectional view and a transverse cross-sectional view of the inner lumen, the first mandrel, the second mandrel, the outer lumen, the second heat shrink tubing of the third embodiment, and fig. 17 is a transverse cross-sectional view of the dual lumen tubing of the third embodiment. Further, in step S1D, the material and shape of second heat shrink sleeve 4 are consistent with the material and shape of first heat shrink sleeve 1. The inner diameter of the second heat shrinkable sleeve 4 is larger than the inner diameter of the outer lumen tube 20, and the length of the second heat shrinkable sleeve 4 is slightly larger than the length of the outer lumen tube 20, so that the outer lumen tube 20 can be completely coated after the second heat shrinkable sleeve 4 is heat shrunk. The second heat shrinkable sleeve 4 is sleeved outside the outer cavity tube 20 along the axis, and a gap is formed between the second heat shrinkable sleeve 4 and the outer cavity tube 20.

In step S1E, the second heat shrinkable sleeve 4 is heated by a heating device, such as a heat gun. In order to improve the heating stability, a customized heating device can be adopted to provide a stable heating body, the length of the heating body is matched with that of the wall patch, the second heat-shrinkable sleeve 4 is heated from the outside in the direction facing the wall patch, and the specific heating time and heating temperature are based on actual requirements, so that the inner cavity tube 10 and the outer cavity tube 20 of the wall patch can be welded as a 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, with a preferred heating time of 3 minutes. In specific application, the heating time can be set according to actual conditions, and if the heating temperature is higher, the heating time is reduced, and vice versa.

As the heating progresses, the heated second heat shrinkable sleeve 4 shrinks inward and covers the outer lumen 20, so that the outer wall of the inner lumen 10 of the wall fitting portion is tightly fitted to the inner wall of the outer lumen 20. The inner lumen tube 10 and the outer lumen tube 20 both made of polyurethane have the same melting point, and as the heating is continued, the outer wall of the inner lumen tube 10 and the inner wall of the outer lumen tube 20 are melted at the same time, so that the outer wall of the inner lumen tube 10 and the inner wall of the outer lumen tube 20 are welded together. Moreover, the heating and melting of the inner lumen tube 10 and the outer lumen tube 20 are performed via the second heat shrinkable sleeve 4, and the heating does not directly act on the inner lumen tube 10 and the outer lumen tube 20, thereby protecting the inner lumen tube 10 and the outer lumen tube 20 to ensure the molding quality of the dual lumen tube 100. Moreover, the inward contraction force of the second heat shrinkable tube 4 acts on the outer wall of the inner lumen tube 10 and the inner wall of the outer lumen tube 20, which are melting at the wall attachment portions, thereby accelerating the welding of the outer wall of the inner lumen tube 10 and the inner wall of the outer lumen tube 20, and ensuring the welding effect.

In step S1F, after second heat shrink 4 is cooled, heat-shrunk second heat shrink 4 is torn off. In the present embodiment, natural cooling may be used, or accelerated cooling may be performed using a cooling device, such as air-blast accelerated cooling. After cooling to room temperature, the second heat-shrinkable sleeve 4 after heat-shrinking can be torn off, so as to obtain the double-lumen tube 100 with thinner wall thickness.

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

Example four

The forming process of the reinforced double-cavity tube in the embodiment is different from that in the third embodiment in that: in step S1E, the fusion bonding of the inner lumen tube 10 of the wall patch to the outer lumen tube 20 includes:

leaving the ends of the inner 10 and outer 20 lumens remote from the wall patch un-welded. It will be appreciated that the inner lumen tube 10 and the outer lumen tube 20 of the dual lumen tube need to be separately connected to external connectors after being formed to be used in a medical cannula. In this embodiment, the ends of the inner lumen tube 10 and the outer lumen tube 20 away from the wall patch are not welded, i.e., the outer wall of the inner lumen tube 10 near the middle of the wall patch is welded to the inner wall of the outer lumen tube 20, while the outer walls of the inner lumen tube 10 at the opposite ends of the wall patch are not welded to the inner wall of the outer lumen tube 20, so that the inner lumen tube 10 and the outer lumen tube 20 at the middle of the double lumen tube are formed as one body, and the inner lumen tube 10 and the outer lumen tube 20 at the opposite ends of the double lumen tube are separated, so as to improve the convenience of connecting the subsequent connecting joints to the inner lumen tube 10 and the outer lumen tube 20, respectively. In specific application, the position and the length of the wall attaching 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, which is not limited herein, and then in step S1E, only the middle section of the second heat shrinkable sleeve 1 is heated, which is not described herein again.

In another embodiment, in order to achieve the effect of preventing the end portion of the inner lumen tube 10 away from the wall portion from being welded with the end portion of the outer lumen tube 20, in step S1E, an arc-shaped spacer (not shown) is disposed at the end portion of the accommodating space 31 of the second mandrel 3, such that the cross section of the second mandrel 3 near the middle portion is crescent-shaped, and the cross section of the second mandrel 3 near the end portion is circular, and the arc-shaped spacer is located between the inner lumen tube 10 and the outer lumen tube 20, and the arc-shaped spacer blocks the end portion of the inner lumen tube 10 away from the wall portion from being welded with the end portion of the outer lumen tube 20 during welding, thereby obtaining a dual lumen tube with non-welded end. In a specific application, according to an actual situation, an arc-shaped spacer may be disposed at one end of the accommodating space 31 of the second mandrel 3, or arc-shaped spacers may be disposed at both ends of the accommodating space 31 of the second mandrel 3.

To sum up, through outer solid pipe with the strengthening rib butt fusion in the outer wall of double-chamber pipe for the strengthening rib can provide stable support for the double-chamber pipe, has guaranteed the support of strengthening rib and has strengthened the effect. In addition, through the butt fusion protection of first heat shrinkage bush, can avoid direct heating to influence the outward appearance that adds the strong type double lumen pipe, and the inside shrink power of first heat shrinkage bush can promote the strengthening rib butt fusion process to guarantee the butt fusion quality of strengthening rib. And moreover, a novel double-cavity tube forming process is also provided, wherein the inner cavity tube and the outer cavity tube are obtained respectively, and then the double-cavity tube is obtained by welding the inner cavity tube and the outer cavity tube, so that the wall thickness of the formed double-cavity tube is thinner, the effective utilization area of the cavity is larger, the utilization rate of the cavity is higher, and the application in the field of medical intubation is facilitated. In addition, the forming process of the reinforced double-cavity tube provides a new double-cavity tube forming mode on the basis of the current mature application technology, the cavity of the double-cavity tube can be adjusted according to the actual requirement, the forming quality control is easier to control, and the cost in the research and development stage is lower.

The above is merely an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

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

sleeving a reinforcing rib outside the double-cavity pipe;

sleeving an external fixing pipe outside the reinforcing rib;

sleeving a first heat-shrinkable tube outside the outer fixed tube;

and heating the first heat-shrinkable sleeve to shrink and wrap the first heat-shrinkable sleeve on the outer fixed pipe, and welding the outer fixed pipe on the reinforcing rib and the outer wall of the double-cavity pipe.

2. The reinforced dual lumen tube molding process of claim 1 wherein obtaining a dual lumen tube and maintaining the shape of the dual lumen tube comprises:

directly extruding the dual lumen tube by an extrusion molding process;

3. The reinforced dual lumen tube molding process of claim 1 wherein obtaining a dual lumen tube and maintaining the shape of the dual lumen tube comprises:

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

sleeving the outer cavity pipe outside the inner cavity pipe, and respectively maintaining the cavity shapes of the inner cavity pipe and the outer cavity pipe unchanged through the first mandrel and the second mandrel;

4. The reinforced double-cavity tube molding process according to claim 3, wherein the reinforcing rib is sleeved outside the outer cavity tube; and heating the first heat-shrinkable sleeve to shrink and wrap the first heat-shrinkable sleeve on the outer fixed pipe, and fusing the inner cavity pipe and the outer cavity pipe of the wall pasting part while fusing the outer fixed pipe on the reinforcing rib and the outer wall of the double-cavity pipe.

5. The reinforced double-lumen tube forming process according to claim 3, wherein the inner wall of the outer lumen tube is attached to the outer wall of the inner lumen tube to form a wall attaching portion, and then further comprising:

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

heating the second heat-shrinkable sleeve to shrink and wrap the second heat-shrinkable sleeve on the outer cavity tube and to weld the inner cavity tube and the outer cavity tube of the wall pasting part;

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

6. The reinforced double lumen tube molding process of claim 2 wherein the inner and outer lumen tubes are obtained separately, comprising: obtaining the inner cavity tube and the outer cavity tube by an injection molding process; or the inner lumen tube and the outer lumen tube are obtained by an extrusion molding process.

7. The reinforced dual lumen tube molding process of any of claims 4-6 wherein fusing the inner lumen tube of the wall patch to the outer lumen tube comprises:

the end parts of the inner cavity pipe and the outer cavity pipe which are far away from the wall attaching part are not welded.

8. The reinforced double lumen tube molding process of any one of claims 2-6 wherein the first mandrel is circular in cross-section; the cross section of the second mandrel is crescent-shaped; the second mandrel is provided with a containing space; the first mandrel can be accommodated in the accommodating space.

9. The reinforced dual chamber tube molding process of claims 1-6 wherein the outer solid tube is welded to the reinforcing ribs and the outer wall of the dual chamber tube, and thereafter further comprising:

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

10. A reinforced dual lumen tube formed by the reinforced dual lumen tube forming process of any of claims 1-9.