CN112643989A - Double-cavity tube forming process and double-cavity tube - Google Patents
Double-cavity tube forming process and double-cavity tube Download PDFInfo
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- CN112643989A CN112643989A CN202011379002.8A CN202011379002A CN112643989A CN 112643989 A CN112643989 A CN 112643989A CN 202011379002 A CN202011379002 A CN 202011379002A CN 112643989 A CN112643989 A CN 112643989A
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- 238000001125 extrusion Methods 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 239000004814 polyurethane Substances 0.000 claims description 8
- 238000001746 injection moulding Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 11
- 238000002627 tracheal intubation Methods 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 6
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- 230000009471 action Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0009—Making of catheters or other medical or surgical tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M25/0026—Multi-lumen catheters with stationary elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/38—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses
- B29C63/42—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses using tubular layers or sheathings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
- B29C66/52211—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other for making endless tubular articles, e.g. endless inner tubes
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- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
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- Animal Behavior & Ethology (AREA)
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Abstract
The invention discloses a forming process of a double-cavity tube, which comprises the following steps: respectively obtaining an inner cavity pipe and an outer cavity pipe, sleeving the outer cavity pipe outside the inner cavity pipe, keeping the shapes of the inner cavity pipe and the outer cavity pipe unchanged, pasting the inner wall of the outer cavity pipe with the outer wall of the inner cavity pipe to form a wall pasting part, sleeving a heat-shrinkable sleeve outside the outer cavity pipe, heating the heat-shrinkable sleeve, coating the heat-shrinkable sleeve on the outer cavity pipe, and welding the inner cavity pipe and the outer cavity pipe of the wall pasting part; the invention also discloses a double-cavity tube. According to the double-cavity tube, the inner cavity tube and the outer cavity tube are firstly and respectively obtained, then the double-cavity tube is obtained by welding the inner cavity tube and the outer cavity tube, the wall thickness of the double-cavity tube is thinner after the double-cavity tube is formed, the effective utilization area of the cavity is larger, the utilization rate of the cavity is higher, and the double-cavity tube is particularly convenient to apply in the field of medical intubation.
Description
Technical Field
The invention relates to the technical field of intubation, in particular to a double-cavity tube forming process and a double-cavity tube.
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 dual lumen tube. The double-cavity tube comprises an inner cavity tube 10 and an outer cavity tube 20, 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 do not interfere with each other are formed. When the double-cavity tube is particularly applied to the intubation of the medical industry, the two cavities of the double-cavity tube are respectively communicated with the artery and the vein of the human body, so that the treatment process is completed by matching with medical instruments.
At present, the forming process of the double-cavity tube is basically an integral extrusion forming process. However, the extrusion-molded double-lumen tube is limited by the extrusion die cavity, the tube wall of the extruded double-lumen tube is thicker, the effective area of the cavity is difficult to be fully utilized, and the application in the field of medical intubation tubes is particularly limited because the thinner the tube wall is, the larger the blood flow rate which can flow through the intubation tube in the same time can be, under the condition that the outer diameter of the intubation tube which is attached to the blood vessel wall is ensured.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a forming process of a double-cavity tube and the double-cavity tube.
The invention discloses a forming process of a double-cavity tube, which comprises the following steps:
respectively obtaining an inner cavity tube and an outer cavity tube;
sleeving the outer cavity tube outside the inner cavity tube, keeping the shapes of the inner cavity tube and the outer cavity tube unchanged, and attaching the inner wall of the outer cavity tube to the outer wall of the inner cavity tube to form a wall attaching part;
sleeving a heat-shrinkable sleeve outside the outer cavity;
and heating the heat-shrinkable sleeve to wrap the heat-shrinkable sleeve in the outer cavity tube and weld the inner cavity tube and the outer cavity tube of the wall pasting part.
According to an embodiment of the present invention, a wall attaching part for attaching an inner wall of an outer lumen tube to an outer wall of an inner lumen tube while maintaining shapes of the inner lumen tube and the outer lumen tube constant, the wall attaching part including:
sleeving the inner cavity pipe outside the first mandrel, wherein the shape of the inner cavity pipe is kept unchanged by the first mandrel;
placing the first mandrel sleeved with the inner cavity pipe in the accommodating space of the second mandrel; the accommodating space is communicated with the outer wall of the second mandrel;
sleeving the outer cavity tube outside the second mandrel, and enabling the inner wall of the outer cavity tube to be attached to the outer wall of the inner cavity tube to form a wall attaching part; the second mandrel maintains the shape of the outer lumen.
According to an embodiment of the invention, the first mandrel is circular in cross-section; the cross section of the second mandrel is crescent-shaped.
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 one embodiment of the present invention, the inner lumen tube and the outer lumen tube are thin-walled tubes made of polyurethane.
According to an embodiment of the present invention, the inner lumen tube of the wall patch is welded to the outer lumen tube, and then further comprising:
and after the heat-shrinkable sleeve is cooled, tearing off the heat-shrinkable sleeve after heat shrinkage.
According to an embodiment of the present invention, the method further comprises the following steps:
respectively extracting a first mandrel and a second mandrel;
a dual lumen tube is obtained.
According to an embodiment of the present invention, the material of the heat shrinkable sleeve is one of EVA, FEP, PE, and PTFE.
According to one 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.
A double-cavity tube formed by adopting the forming process of the double-cavity tube.
The beneficial effect of this application lies in: the application provides a novel double-cavity tube forming process, which comprises the steps of firstly respectively obtaining an inner cavity tube and an outer cavity tube, and then obtaining the double-cavity tube by welding the inner cavity tube and the outer cavity tube, wherein the wall thickness of the double-cavity tube is thinner after forming, the effective utilization area of a cavity is larger, the utilization rate of the cavity is higher, and the application in the field of intubation is facilitated. In addition, the forming process of the double-cavity tube provides a new forming mode of the double-cavity tube 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 dual lumen tube;
FIG. 2 is a flow chart of a dual lumen tube forming process in accordance with the present embodiment;
FIG. 3 is a schematic diagram of the structure of the inner lumen, the outer lumen, the heat shrinkable sleeve, the first mandrel and the second mandrel of this embodiment;
FIG. 4 is a longitudinal cross-sectional view of the inner lumen and first mandrel in this embodiment in mating relationship;
FIG. 5 is a longitudinal cross-sectional view of the inner lumen, first mandrel and second mandrel of this embodiment;
FIG. 6 is a transverse cross-sectional view of the inner lumen, first mandrel and second mandrel of this embodiment;
FIG. 7 is a longitudinal cross-sectional view of the inner lumen, first mandrel, second mandrel, and outer lumen of this embodiment;
FIG. 8 is a transverse cross-sectional view of the inner lumen, first mandrel, second mandrel, and outer lumen of the present embodiment;
FIG. 9 is a longitudinal cross-sectional view of the inner lumen, first mandrel, second mandrel, outer lumen and heat shrink in this embodiment;
FIG. 10 is a transverse cross-sectional view of the inner lumen, first mandrel, second mandrel, outer lumen, and heat shrink in this example.
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.
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 2 and 3, fig. 2 is a flow chart of a forming process of the dual-lumen tube in the present embodiment, and fig. 3 is a schematic structural diagram of the inner lumen tube, the outer lumen tube, the heat shrinkable sleeve, the first mandrel and the second mandrel in the present embodiment. The forming process of the double-cavity tube in the embodiment comprises the following steps:
s1, obtaining the inner lumen tube 10 and the outer lumen tube 20, respectively.
S2, the outer lumen tube 20 is sleeved outside the inner lumen tube 10, the shapes of the inner lumen tube 10 and the outer lumen tube 20 are maintained, and the inner wall of the outer lumen tube 20 is attached to the outer wall of the inner lumen tube 10 to form a wall attachment portion.
S3, the heat shrinkable sleeve 1 is sleeved outside the outer cavity tube 20.
S4, heating the heat-shrinkable sleeve 1 to make the heat-shrinkable sleeve 1 shrink-wrap the outer cavity tube 20 and to make the inner cavity tube 10 of the wall pasting part and the outer cavity tube 20 weld.
The inner cavity tube 10 and the outer cavity tube 20 are obtained respectively, and then the double cavity tube is obtained by welding the inner cavity tube 10 and the outer cavity tube 20, 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 double cavity tube is convenient to apply in the field of intubation.
Referring back to fig. 2 and 3, further, in step S1, the inner lumen tube 10 and the outer lumen tube 20 are obtained, respectively, including:
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 extrusion die cavity, a relatively thinner thin-walled tube of single lumen can be obtained. In this embodiment, the obtaining of the inner lumen tube 10 and the outer lumen tube 20 in the thin-walled tubular shape in step S1 lays a foundation for the subsequent forming of the double lumen tube with a thin 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 pipe diameters and the lengths of the inner cavity tube 10 and the outer cavity tube 20 according to the actual requirement of the cavity of the double-cavity tube, and the molding quality control is easy to control. The inner lumen 10 and the outer lumen 20 are of uniform length in this embodiment.
Referring also to fig. 4 to 8, fig. 4 is a longitudinal sectional view of the inner lumen and the first mandrel in this embodiment, fig. 5 is a longitudinal sectional view of the inner lumen, the first mandrel and the second mandrel in this embodiment, fig. 6 is a transverse sectional view of the inner lumen, the first mandrel and the second mandrel in this embodiment, fig. 7 is a longitudinal sectional view of the inner lumen, the first mandrel, the second mandrel and the outer lumen in this embodiment, and fig. 8 is a transverse sectional view of the inner lumen, the first mandrel, the second mandrel and the outer lumen in this embodiment. Further, in step S2, the method for manufacturing a wall-attaching part by attaching the outer lumen 20 to the outer wall of the inner lumen 10 while maintaining the shape of the inner lumen 10 and the outer lumen 20 unchanged, includes:
s21, the inner lumen tube 10 is sleeved outside the first mandrel 2, and the first mandrel 2 maintains the shape of the inner lumen tube 10.
S22, the first mandrel 2 sleeved with the inner lumen 10 is 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.
S23, sleeving the outer cavity tube 20 outside the second mandrel 3, and 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 a wall attaching part; the second mandrel 3 maintains the shape of the outer lumen 20.
Through the matching of 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 respectively maintained unchanged, 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 is ensured.
Specifically, in step S21, 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. In the embodiment, the length of the first mandrel 2 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 first mandrel 2 in this embodiment is made of stainless steel.
In step S22, 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 diameter of the circular arc 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 in 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 second mandrel 3 in this embodiment is made of stainless steel.
In step S23, 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 cavity tube 20 and the inner cavity tube 10 are both flexible tubes, the outer cavity tube 20 and the inner cavity 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 cavity tube 20 and the inner cavity tube 10 are kept unchanged, the subsequent welding action and the smooth forming of the double cavity tube can be ensured, and the forming quality of the double cavity tube is ensured. When the outer lumen 20 is sleeved outside the second core shaft 3, the inner wall of the outer lumen 20 is attached to the outer wall of the inner lumen 10 along the axial direction, so that a wall attachment is formed along the axial direction, thereby facilitating the subsequent welding of the inner wall of the outer lumen 20 to the outer wall of the inner lumen 10. 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.
Referring also to fig. 9 and 10, fig. 9 is a longitudinal cross-sectional view of the inner lumen, the first mandrel, the second mandrel, the outer lumen, and the heat shrink sleeve of this embodiment, and fig. 10 is a transverse cross-sectional view of the inner lumen, the first mandrel, the second mandrel, the outer lumen, and the heat shrink sleeve of this embodiment. Further, in step S3, the cross-section of the heat shrinkable sleeve 1 is circular, and the length of the heat shrinkable sleeve 1 is greater than the length of the outer lumen tube 20 and less than the length of the second mandrel 3. The inner diameter of the heat-shrinkable sleeve 1 is larger than that of the outer cavity tube 20, and after the heat-shrinkable sleeve 1 is sleeved outside the outer cavity tube 20 along the axial direction, a gap is formed between the heat-shrinkable sleeve 1 and the outer cavity tube 20. In this embodiment, the material of the heat shrinkable sleeve 1 is one of EVA, FEP, PE, and PTFE. When heated, the heat shrinkable sleeve 1 will shrink inwardly, thereby covering the outer lumen tube 20.
Preferably, in step S4, heat shrinkable sleeve 1 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 heat shrinkable sleeve 1 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, and 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 heat shrinkable sleeve 1 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. Furthermore, the heating and melting of the inner lumen tube 10 and the outer lumen tube 20 are performed via the heat shrinkable sleeve 1, 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 quality of the final double lumen tube. Furthermore, the inward contraction force of the heat-shrinkable sleeve 1 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-attaching 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.
Referring to fig. 2 again, in step S4, the inner lumen 10 of the wall patch is welded to the outer lumen 20, and then:
s5, after cooling heat shrinkable sleeve 1, heat shrinkable sleeve 1 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. And cooling to room temperature to tear off the heat-shrinkable sleeve 1 after heat shrinkage.
Preferably, in step S5, the heat-shrinkable sleeve 1 is torn off, and then:
s6, extracting the first mandrel 2 and the second mandrel 3 respectively. The extraction can be performed by using an existing extraction device, and details are not described here.
And S7, obtaining the double-cavity tube.
Example two
The forming process of the double-cavity tube in the embodiment is different from that in the first embodiment in that: in step S4, the welding 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 may be separately connected to an external fitting after molding. 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. When the double-cavity pipe is applied specifically, the position and the length of the wall pasting part can be preset according to actual requirements, so that one end of the double-cavity pipe is not welded, or two ends of the double-cavity pipe are not welded, and the position is not limited. In step S4, only the middle section of heat shrinkable sleeve 1 is heated, which is not described herein.
In another embodiment, in order to achieve the effect of preventing the end portion of the inner lumen tube 10 away from the wall patch from being welded with the end portion of the outer lumen tube 20, in step S2, an arc-shaped spacer (not shown) is disposed at the end portion of the receiving 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 during welding, the arc-shaped spacer blocks the end portion of the inner lumen tube 10 away from the wall patch from being welded with the end portion of the outer lumen tube 20, thereby obtaining a dual lumen tube with non-welded. 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.
In summary, the above embodiments provide a new process for forming a dual lumen tube, in which an inner lumen tube and an outer lumen tube are obtained first, and then the dual lumen tube is obtained by fusing the inner lumen tube and the outer lumen tube, so that the wall thickness of the formed dual lumen tube is thinner, the effective utilization area of the cavity is larger, the utilization rate of the cavity is higher, and the process is particularly convenient for application in the field of medical intubation. In addition, the forming process of the double-cavity tube provides a new forming mode of the double-cavity tube 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 (10)
1. A process for forming a dual lumen tube, comprising:
respectively obtaining an inner cavity tube and an outer cavity tube;
sleeving the outer cavity tube outside the inner cavity tube, keeping the shapes of the inner cavity tube and the outer cavity tube unchanged, and attaching the inner wall of the outer cavity tube to the outer wall of the inner cavity tube to form a wall attaching part;
sleeving a heat-shrinkable sleeve outside the outer cavity;
and heating the heat-shrinkable sleeve to make the heat-shrinkable sleeve cover the outer cavity tube in a heat-shrinkable manner and make the inner cavity tube of the wall pasting part and the outer cavity tube be welded.
2. The process of forming a dual lumen tube as set forth in claim 1 wherein positioning the outer lumen tube outside the inner lumen tube while maintaining the shape of the inner lumen tube and the outer lumen tube and attaching the inner wall of the outer lumen tube to the outer wall of the inner lumen tube to form a wall attachment portion comprises:
sleeving the inner cavity pipe outside a first mandrel, wherein the shape of the inner cavity pipe is kept unchanged by the first mandrel;
placing the first mandrel sleeved with the inner cavity pipe in an accommodating space of a second mandrel; the accommodating space is communicated with the outer wall of the second mandrel;
sleeving the outer cavity tube outside the second mandrel, and enabling the inner wall of the outer cavity tube to be attached to the outer wall of the inner cavity tube to form a wall attaching part; the second mandrel maintains the shape of the outer lumen.
3. The dual lumen tube molding process of claim 2 wherein the first mandrel is circular in cross-section; the cross section of the second mandrel is crescent-shaped.
4. The process for forming a dual lumen tube of claim 1 wherein the inner lumen tube and the outer lumen tube are separately obtained 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.
5. The process for forming a dual lumen tube as claimed in claim 1 wherein the inner and outer lumens are thin walled tubes of polyurethane.
6. The dual lumen tube molding process of claim 2 wherein the inner lumen tube of the wall patch is fused to the outer lumen tube, and thereafter further comprising:
and tearing off the heat-shrinkable sleeve after heat shrinkage after the heat-shrinkable sleeve is cooled.
7. The dual lumen tube molding process of claim 6 wherein said heat shrink tubing is torn after heat shrinking, and thereafter further comprising:
respectively extracting the first mandrel and the second mandrel;
a dual lumen tube is obtained.
8. The process of forming a dual lumen tube as set forth in claim 1 wherein said heat shrink tubing is one of EVA, FEP, PE or PTFE.
9. The process of forming a dual lumen tube as set forth in any one of claims 1-8 wherein fusing said inner lumen tube of said wall patch to said 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.
10. A dual lumen tube formed by the dual lumen tube forming process of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011379002.8A CN112643989A (en) | 2020-11-30 | 2020-11-30 | Double-cavity tube forming process and double-cavity tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011379002.8A CN112643989A (en) | 2020-11-30 | 2020-11-30 | Double-cavity tube forming process and double-cavity tube |
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| CN112643989A true CN112643989A (en) | 2021-04-13 |
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| CN202011379002.8A Pending CN112643989A (en) | 2020-11-30 | 2020-11-30 | Double-cavity tube forming process and double-cavity tube |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2514845Y (en) * | 2001-09-28 | 2002-10-09 | 饶华庚 | Pressure nutritional double cavity pipe |
| CN2792531Y (en) * | 2005-05-19 | 2006-07-05 | 张鲁英 | Infantile double-cavity conduit with oxygen-supply and sputum-suction functions |
| TW201323187A (en) * | 2011-12-13 | 2013-06-16 | Bioteque Corp | Method for manufacturing multi-lumen tube |
| CN107684659A (en) * | 2016-08-05 | 2018-02-13 | 北京嘉维科技开发有限公司 | ECMO is intubated with two-chamber diplocardia room |
| CN211132392U (en) * | 2019-11-05 | 2020-07-31 | 南京医科大学第二附属医院 | Percutaneous left heart drainage tube |
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2020
- 2020-11-30 CN CN202011379002.8A patent/CN112643989A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2514845Y (en) * | 2001-09-28 | 2002-10-09 | 饶华庚 | Pressure nutritional double cavity pipe |
| CN2792531Y (en) * | 2005-05-19 | 2006-07-05 | 张鲁英 | Infantile double-cavity conduit with oxygen-supply and sputum-suction functions |
| TW201323187A (en) * | 2011-12-13 | 2013-06-16 | Bioteque Corp | Method for manufacturing multi-lumen tube |
| CN107684659A (en) * | 2016-08-05 | 2018-02-13 | 北京嘉维科技开发有限公司 | ECMO is intubated with two-chamber diplocardia room |
| CN211132392U (en) * | 2019-11-05 | 2020-07-31 | 南京医科大学第二附属医院 | Percutaneous left heart drainage tube |
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Application publication date: 20210413 |