CN110789129A - Enhanced medical cannula and manufacturing method thereof - Google Patents
Enhanced medical cannula and manufacturing method thereof Download PDFInfo
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- CN110789129A CN110789129A CN201910574424.1A CN201910574424A CN110789129A CN 110789129 A CN110789129 A CN 110789129A CN 201910574424 A CN201910574424 A CN 201910574424A CN 110789129 A CN110789129 A CN 110789129A
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- tube layer
- tube
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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
- 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
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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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
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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
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids
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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
- A61M25/10—Balloon catheters
- A61M25/1027—Making of balloon catheters
-
- 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
- A61M25/10—Balloon catheters
- A61M25/1027—Making of balloon catheters
- A61M25/1036—Making parts for balloon catheter systems, e.g. shafts or distal ends
-
- 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
- B29C66/5227—Joining tubular articles for forming multi-tubular articles by longitudinally joining elementary tubular articles wall-to-wall (e.g. joining the wall of a first tubular article to the wall of a second tubular article) or for forming multilayer tubular articles
- B29C66/52271—Joining tubular articles for forming multi-tubular articles by longitudinally joining elementary tubular articles wall-to-wall (e.g. joining the wall of a first tubular article to the wall of a second tubular article) or for forming multilayer tubular articles one tubular article being placed inside the other
- B29C66/52272—Joining tubular articles for forming multi-tubular articles by longitudinally joining elementary tubular articles wall-to-wall (e.g. joining the wall of a first tubular article to the wall of a second tubular article) or for forming multilayer tubular articles one tubular article being placed inside the other concentrically, e.g. for forming multilayer tubular articles
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Biomedical Technology (AREA)
- Pulmonology (AREA)
- Biophysics (AREA)
- Anesthesiology (AREA)
- Hematology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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- Mechanical Engineering (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
The invention discloses an enhanced medical cannula and a manufacturing method thereof, wherein the manufacturing method of the enhanced medical cannula comprises the steps of providing a first tube layer, a reinforcing rib and a second tube layer; arranging a reinforcing rib between the outer surface of the first tube layer and the inner surface of the second tube layer; and heating at least one of the first tube layer and the second tube layer to enable the first tube layer and the second tube layer to be welded and to coat the reinforcing ribs. The formed first tube layer and the second tube layer are assembled with the reinforcing ribs into a whole, and at least one of the first tube layer and the second tube layer is heated again, so that the first tube layer and the second tube layer can be welded, the complex repeated operation is avoided, the finished product quality and the manufacturing efficiency of the enhanced medical cannula are greatly improved, and the reduction of the production cost is realized.
Description
Technical Field
The invention relates to the technical field of inventions, in particular to an enhanced medical cannula and a manufacturing method thereof.
Background
At present, a non-reinforced pipe can be directly extruded by an extruder in the forming mode of the medical cannula, but the forming method of the reinforced medical cannula is not a few, and the reinforced medical cannula is formed by a dip molding mode generally. Dipping plastic molding is to dip the mandrel into the material liquid of the molding enhanced medical cannula, then baking the mandrel dipped with the material liquid on the surface to plasticize the material liquid, and forming the basic pipe fitting by repeating the steps of dipping the material liquid and heating and plasticizing. Then the reinforcing rib is sleeved on the manufactured basic tube body, the basic tube body sleeved with the reinforcing rib is immersed in the material liquid of the formed enhanced medical intubation tube, then the basic tube body with the surface dipped with the material liquid and the reinforcing rib are baked to plasticize the material liquid, and the enhanced medical intubation tube is formed by repeating the steps of dipping the material liquid and heating and plasticizing.
Use and dip in moulding's shaping mode needs a lot of repeatedly dip in, add the thermal plasticization, complex operation, owing to use and dip in moulding's shaping mode shaping, need slow down speed as far as possible when dipping in the emulsion, avoid the unable thorough cladding strengthening rib of emulsion, in order to avoid producing in the body after the plastify has the bubble, lead to shaping inefficiency, high in production cost, therefore, how to improve the cladding nature of strengthening rib, reduce to dip in the number of times as far as possible and avoid using and dip in moulding mode even and obtain the medical intubate of enhancement mode and become the problem of treating urgently.
Disclosure of Invention
The embodiment of the invention provides a reinforced medical cannula and a manufacturing method thereof, and aims to solve the problems of unstable quality, low efficiency, high cost and the like of the reinforced medical cannula formed by the existing forming process.
In order to solve the technical problem, the invention provides a manufacturing method of an enhanced medical cannula, which comprises the steps of providing a first tube layer, a reinforcing rib and a second tube layer; arranging a reinforcing rib between the outer surface of the first tube layer and the inner surface of the second tube layer; and heating at least one of the first tube layer and the second tube layer to enable the first tube layer and the second tube layer to be welded and to coat the reinforcing ribs.
According to an embodiment of the present invention, after the step of disposing the reinforcing rib between the first tube layer and the second tube layer, a step of compressing gaps between the first tube layer and the reinforcing rib and between the reinforcing rib and the second tube layer is further included.
According to an embodiment of the present invention, the step of compressing the gap between the first tube layer, the reinforcing rib, and the second tube layer includes the sub-steps of: providing a compression structure in the outer surface of the second tube layer and/or an expansion structure in the first tube layer; the compression and/or expansion structures are heated such that the compression and/or expansion structures compress the gaps between the first tube layer, the reinforcement ribs, and the second tube layer.
According to an embodiment of the present invention, the compression structure is a heat shrinkable tube.
According to an embodiment of the present invention, after the step of heating at least one of the first tube layer and the second tube layer to fuse the first tube layer and the second tube layer and to wrap the reinforcing ribs, the method further includes the step of removing the compressive structures and/or the expansive structures.
According to an embodiment of the present invention, the material of the expansion structure includes aluminum, copper, iron, or austenitic stainless steel.
According to an embodiment of the present invention, the step of removing the compressive structures and/or the expansive structures further comprises a step of cooling the first tube layer, the reinforcing ribs, the second tube layer, the compressive structures and/or the expansive structures.
According to an embodiment of the present invention, in the step of heating at least one of the first tube layer and the second tube layer to fuse the first tube layer and the second tube layer, and coating the reinforcing rib, the compression structure and/or the expansion structure are/is heated, and the compression structure and/or the expansion structure conduct heat to the second tube layer and/or the first tube layer to heat the second tube layer and/or the first tube layer.
According to an embodiment of the present invention, the step of compressing the gap between the first tube layer, the reinforcing rib, and the second tube layer includes the sub-steps of: arranging an inflatable air bag in the first tube layer; and inflating the inflatable airbag to expand the inflatable airbag, wherein the expanded inflatable airbag compresses the gaps among the first tube layer, the reinforcing ribs and the second tube layer.
According to an embodiment of the present invention, in the step of heating at least one of the first tube layer and the second tube layer to fuse the first tube layer and the second tube layer and to coat the reinforcing rib, the first tube layer and the second tube layer are heated by heating the reinforcing rib.
According to an embodiment of the present invention, the reinforcing rib is heated by placing the reinforcing rib between the first tube layer and the second tube layer in an alternating magnetic field.
According to an embodiment of the present invention, the step of disposing the reinforcing rib between the first tube layer and the second tube layer includes the sub-steps of: arranging a reinforcing rib on the outer surface of the first tube layer; and arranging a second tube layer on one side of the reinforcing rib departing from the first tube layer.
According to an embodiment of the present invention, the step of disposing the reinforcing rib between the first tube layer and the second tube layer includes the sub-steps of: arranging a reinforcing rib on the inner surface of the second tube layer; and arranging a first tube layer on one side of the reinforcing rib departing from the second tube layer.
According to an embodiment of the present invention, the step of disposing the reinforcing rib between the first tube layer and the second tube layer includes the sub-steps of: arranging a first pipe layer in a second pipe layer; the reinforcing ribs are arranged between the first tube layer and the first tube layer.
According to an embodiment of the present invention, the first tube layer is formed by extrusion and/or dip forming through an extruder, and/or the second tube layer is formed by extrusion and/or dip forming through an extruder.
The invention provides a reinforced medical cannula which is characterized by being manufactured by the manufacturing method of the reinforced medical cannula.
According to an embodiment of the present invention, the reinforced medical cannula is a diameter tube or a reducer tube.
In the embodiment of the invention, the manufacturing method of the enhanced medical cannula firstly assembles the first tube layer, the reinforcing rib and the second tube layer, and then heats at least one of the first tube layer and the second tube layer to enable at least one of the first tube layer and the second tube layer to reach a molten state, so that the first tube layer, the reinforcing rib and the second tube layer are combined into a whole, and the enhanced medical cannula is quickly manufactured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic illustration of a method of making an enhanced medical cannula of the present invention;
FIG. 2 is an assembled view of the enhanced medical cannula of the present invention;
FIG. 3 is a schematic view of an enhanced medical cannula of the present invention;
FIG. 4 is another schematic view of the enhanced medical cannula of the present invention;
FIG. 5 is a schematic view of an enhanced medical cannula of the present invention provided with a compression structure;
FIG. 6 is a schematic view of the enhanced medical cannula of the present invention provided with an expansion feature;
FIG. 7 is a schematic view of an inflatable bladder of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are one embodiment of the present invention, and not all embodiments of the present invention. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Please refer to fig. 1, fig. 2, fig. 3 and fig. 4, which are schematic diagrams of a manufacturing method of the enhanced medical cannula of the present invention, a state schematic diagram of a reinforcing rib located between a first tube layer and a second tube layer, and two schematic diagrams of the enhanced medical cannula. As shown in the drawing, the method of manufacturing the reinforced medical cannula according to the present embodiment first performs step S11: providing a first tube layer 10, a reinforcing rib 11 and a second tube layer 12; step S13 is then executed: arranging reinforcing ribs 11 between the outer surface of the first tube layer 10 and the inner surface of the second tube layer 12; finally, step S15 is executed: and heating at least one of the first tube layer 10 and the second tube layer 12 to weld the first tube layer 10 and the second tube layer 12 together and to coat the reinforcing ribs 11. And cooling and shaping the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 which are to be integrated into a whole to obtain the enhanced medical cannula 1.
In step S11, the first tube layer 10 and the second tube layer 12 are provided, preferably by direct extrusion using an extruder, to improve efficiency, but may be formed by dip molding. The material used to form the first tube layer 10 and the second tube layer 12 may include any one or more of PVC (polyvinyl chloride), TPU (polyurethane), and other biocompatible medical materials that may be used to form a medical cannula. And the inner diameter of the reinforcing rib 11 is larger than the outer diameter of the formed first tube layer 10, and the inner diameter of the second tube layer 12 is larger than, equal to or smaller than the outer diameter of the reinforcing rib 11.
In step S13, the reinforcing bars 11 are disposed between the outer surface of the first tube layer 10 and the inner surface of the second tube layer 12, i.e., the reinforcing bars 11 are located within the second tube layer 12 and the first tube layer 10 is located within the reinforcing bars 11 (as shown in fig. 2).
When step S13 is executed, sub-step S131 may be executed first: sleeving the reinforcing ribs 11 on the outer surface of the first tube layer 10; then, the substep S133 is executed: and arranging a second tube layer 12 on one side of the reinforcing rib 11 departing from the first tube layer 10, and finishing the assembly of the first tube layer 10, the reinforcing rib 11 and the second tube layer 12. If the selected outer diameter of the reinforcing rib 11 is greater than or equal to the inner diameter of the second tube layer 12, before the second tube layer 12 is sleeved on the reinforcing rib 11, the inner diameter of the second tube layer 12 may be enlarged, so that the reinforcing rib 11 sleeved on the first tube layer 10 is completely inserted into the second tube layer 12. The inner diameter of the second tube layer 12 may be expanded by pressing the second tube layer 12, or by inflating the second tube layer 12 to expand the second tube layer 12, so that the inner diameter of the second tube layer 12 is larger than the outer diameter of the reinforcing ribs 11. After assembly, the second tube layer 12 is placed against the reinforcement 11. In addition, the pipe is assembled by expanding the inner diameter of the second pipe layer 12 and inserting the reinforcing ribs 11 sleeved with the first pipe layer 10, so that the pipe can also be used for manufacturing the reducing medical pipe.
In step S13, the sequence of sub-step S131 and sub-step S133 may be interchanged, that is, the reinforcing ribs 11 are inserted into the second tube layer 12, and then the first tube layer 10 is inserted into the reinforcing ribs 11 located in the second tube layer 12. Of course, when the selected inner diameter of the second tube layer 12 is larger than the outer diameter of the reinforcing rib 11, the first tube layer 10 may be inserted into the second tube layer 12 (there is a gap between the first tube layer 10 and the second tube layer 12 at this time), and then the reinforcing rib 11 is inserted into the gap between the first tube layer 10 and the second tube layer 12, so as to complete the assembly of the first tube layer 10, the reinforcing rib 11, and the second tube layer 12.
Specifically, the reinforcing rib 11 is a spring, and the spring can be a linear spring, a leaf spring or a connector of the linear spring and the leaf spring, and the finally manufactured reinforced medical cannula 1 can be a straight tube (as shown in fig. 3) or a reducer tube according to the type of the reinforcing rib 11. When the enhanced medical cannula 1 to be formed is a reducer tube, the first tube layer 10 and the second tube layer 12 which are both the reducer tube are selected, the length of the reinforcing rib 11 is smaller than that of the first tube layer 10 and that of the second tube layer 12, and both ends of the reinforcing rib are not exposed out of the first tube layer 10 and the second tube layer 12. Take a femoral artery cannula (as shown in fig. 4) as an example, the spring selected for the stiffener 11 is a leaf spring, the spring in the perforated section is a wider leaf spring, the spring in the non-perforated section is a tighter leaf spring, and the spring in the non-perforated section also adopts a variable diameter transition at one end to fit the corresponding structures of the first tube layer 10 and the second tube layer 12.
In step S15, at least one of the first tube layer 10 and the second tube layer 12 is heated to fuse the first tube layer 10 and the second tube layer 12, and the first tube layer 10 and the second tube layer 12 are heated by heating the reinforcing ribs 11. In detail, two ends of a reinforcing rib 11 positioned between a first tube layer 10 and a second tube layer 12 are conducted by using a lead, and then the reinforcing rib 11, the first tube layer 10 and the second tube layer 12 are placed in an alternating magnetic field together, because the reinforcing rib 11 is made of a metal material, a closed loop formed by connecting the reinforcing rib and the lead generates an induced current in a high-frequency alternating magnetic field, and the induced current is an alternating current, the larger the change frequency of the induced current is, the higher the temperature generated by the reinforcing rib 11 is. The temperature generated by the reinforcing ribs 11 can enable the outer surface of the first tube layer 10 and the inner surface of the second tube layer 12 which are in contact with the reinforcing ribs to reach a molten state, and the molten parts of the first tube layer 10 and the second tube layer 12 gradually wrap the reinforcing ribs 11 until the first tube layer 10 and the second tube layer are mutually fused. When the first tube layer 10 and the second tube layer 12 are welded into a whole, the alternating magnetic field and the connecting leads are removed, and the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 which are welded into a whole are cooled, so that the enhanced medical cannula 1 is obtained.
Preferably, when the reinforcing rib 11 is a sheet spring or a connecting body of a linear spring and the sheet spring, the sheet spring may be hollowed out, so that when step S15 is executed, the melted portions of the first tube layer 10 and the second tube layer 12 can be fused through the hollowed-out portion of the sheet spring, the fused volume of the first tube layer 10 and the second tube layer 12 is increased, and the overall connectivity of the first tube layer 10, the reinforcing rib 11, and the second tube layer 12 is improved.
Referring to fig. 5 and 6, a reinforced medical cannula with a compression structure and a reinforced medical cannula with an expansion structure according to the present invention are shown. After step S13 is executed: after the reinforcing ribs 11 are disposed between the first tube layer 10 and the second tube layer 12, step S14 of compressing the gaps between the first tube layer 10, the reinforcing ribs 11, and the second tube layer 12 is further included to ensure that the first tube layer 10 and the second tube layer 12 are closely attached to the reinforcing ribs 11 before step S15 is performed, so that at least one of the first tube layer 10 and the second tube layer 12 can be effectively heated when step S15 is performed.
When the gaps between the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 are compressed, the sub-step S141 is performed: providing a compression structure 13a in the outer surface of the second tube layer 12 and/or an expansion structure 13b in the first tube layer 10; substep S143 is performed to heat the compression structure 13a and/or the expansion structure 13b such that the compression structure 13a and/or the expansion structure 13b compresses the gap between the first tube layer 10, the reinforcing ribs 11, and the second tube layer 12. When the compression structure 13a is used to compress the gap between the first tube layer 10, the reinforcing rib 11 and the second tube layer 12, the compression structure 13a (as shown in fig. 5) disposed on the outer surface of the second tube layer 12 presses the second tube layer 12 and the reinforcing rib 11 toward the direction close to the first tube layer 10, and compresses the gap between the first tube layer 10, the reinforcing rib 11 and the second tube layer 12 from the outside to the inside. When the expansion structure 13b is used to compress the gap between the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12, the expansion structure 13b (shown in fig. 6) disposed in the first tube layer 10 presses the first tube layer 10 by volume expansion, thereby compressing the gap between the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 from the inside to the outside. Wherein the compression structure 13a is a heat shrinkable tube, which may be of a diameter type or a variable diameter type, depending on the type of the reinforced medical cannula 1 to be formed. The material for making the expansion structure 13b can be selected from materials with different thermal expansion coefficients according to the size of the gap, for example, when the gap is larger, the metal material aluminum with a larger thermal expansion coefficient can be selected. Of course, the material of the expansion structure 13b includes, but is not limited to, metals such as aluminum, copper, iron, austenitic stainless steel, etc., and may be other materials having thermal expansion properties.
Specifically, when the heat-shrinkable tube is used to compress the gaps between the first tube layer 10, the reinforcing ribs 11, and the second tube layer 12, the heat-shrinkable tube is disposed on the outer surface of the second tube layer 12, then the heat-shrinkable tube is heated again, the heat-shrinkable tube shrinks along with the rise of the temperature, and then the heat-shrinkable tube hoops the first tube layer 10, the reinforcing rib 11 and the second tube layer 12 which are positioned in the heat-shrinkable tube, so that the first tube layer 10, the reinforcing rib 11 and the second tube layer 12 are in close contact, the heat generated by the reinforcing rib 11 can be quickly transmitted to the first tube layer 10 and the second tube layer 12, the first tube layer 10 and the second tube layer 12 are heated more effectively, the fusion efficiency is improved, meanwhile, gaps among the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 can be avoided, thus causing the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 to loosen and fall off after the assembly is completed during the operation.
When the expansion structure 13b is used to compress the gap between the first tube layer 10, the reinforcing rib 11 and the second tube layer 12, the shape of the expansion structure 13b at normal temperature corresponds to the shape of the inner space of the first tube layer 10, or is a cylinder/tube with a constant diameter, or is a cylinder/tube with a variable diameter, so as to insert the expansion structure 13b into the first tube layer 10. After the expansion structure 13b is heated, the volume of the expansion structure itself is enlarged, and the first tube layer 10 is further pressed from the inside to the outside, so that the gaps among the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 are compressed while the inner diameter and the outer diameter of the first tube layer 10 are enlarged.
After step S15 is completed, the first tube layer 10, the reinforcing ribs 11, the second tube layer 12 and the heat shrinkable tube and/or the expansion structure 13b are cooled and then the heat shrinkable tube and/or the expansion structure 13b is removed, so as to obtain the enhanced medical cannula 1 of the present invention.
Preferably, the heat-shrinkable tube is a heat-shrinkable tube with low content of hot melt adhesive or without hot melt adhesive, so that after the steps S14 and S15 are completed, the hot melt adhesive of the heat-shrinkable tube is fused with the second tube layer 12 into a whole, which results in increased difficulty in removing the heat-shrinkable tube, and further can reduce the production efficiency of the enhanced medical cannula 1 of the present invention.
Preferably, the heat-shrinkable tube used has a length greater than the lengths of the first tube layer 10 and the second tube layer 12, so that the operation can be performed more conveniently and quickly when the operation of removing the heat-shrinkable tube is performed.
Preferably, after the assembled gaps between the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 are compressed by the heat shrinkable tube and/or the expansion structure 13b, the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 which are closely attached are placed in a vacuum box, air in the vacuum box is pumped out, and the step S15 is executed in a vacuum environment, so that gas residue in the first tube layer 10 and the second tube layer 12 during the fusion process of the first tube layer 10 and the second tube layer 12 can be avoided, and further, the high-quality enhanced medical cannula 1 can be manufactured.
In another embodiment of the present invention, step S15 is performed: at least one of the first tube layer 10 and the second tube layer 12 is heated to weld the first tube layer 10 and the second tube layer 12, and the reinforcing ribs 11 are coated, the heat-shrinkable tube and/or the expansion structure 13b are heated, and the heat-shrinkable tube and/or the expansion structure 13b are used as heat conducting members to heat the second tube layer 12 and/or the first tube layer 10 to a molten state. In other words, in another embodiment of the present invention, two ends of the selected reinforcing rib 11 are connected to form a closed loop without external wires, and the operation of placing the assembled first tube layer 10, reinforcing rib 11, and second tube layer 12 in the alternating magnetic field may be omitted.
When the first tube layer 10 and the second tube layer 12 are welded by heating the heat shrinkable tube, the inner wall of the first tube layer 10 can be supported by using a circular core rod (not shown in the figure), the heat shrinkable tube is firstly heated and shrunk to hoop the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12, the second tube layer 12 is heated to gradually reach a molten state along with the temperature rise, and the molten part of the second tube layer 12 gradually coats the reinforcing ribs 11 and is finally welded with the first tube layer 10. When the first tube layer 10 and the second tube layer 12 are welded by heating the expansion structure 13b, the volume of the expansion structure 13b is gradually increased along with the temperature rise of the expansion structure 13b, the first tube layer 10 is extruded, and gaps among the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 are compressed; with the temperature rising, because the material of the expansion structure 13b is a heat conductive metal, under the heat conduction of the expansion structure 13b, the first tube layer 10 is heated to gradually reach a molten state, and gradually covers the reinforcing rib 11, and is finally welded with the second tube layer 12. Make first pipe layer 10 and second pipe layer 12 butt fusion through the mode of heating heat shrink pipe and/or expansion structure 13b, the part that does not set up strengthening rib 11 in enabling first pipe layer 10 and the second pipe layer 12 also can obtain quick heating, and then can accelerate the butt fusion of first pipe layer 10 and second pipe layer 12.
Specifically, the heat-shrinkable tube may be heated by baking in an oven, irradiation with an infrared lamp, or the like, and the heat-shrinkable tube is a heat-resistant heat-shrinkable tube having a heat-resistant temperature higher than the temperature at which the second tube layer 12 reaches the molten state. The manner of heating the expansion structure 13b may also be the same as the manner of heating the reinforcing bars 11. Of course, the execution speed of step S15 may be increased by heating the heat shrinkable tube and/or the expanded structure 13b and simultaneously heating the reinforcing beads 11.
Referring to FIG. 7, a schematic view of the inflatable bladder of the present invention is shown. In yet another embodiment of the present invention, the step S14 of compressing the gap between the first tube layer 10, the reinforcing bars 11 and the second tube layer 12 includes the sub-step S142 of: arranging an inflatable airbag 131 in the first tube layer 10; and substep S144: the inflatable airbag 131 is inflated to expand the inflatable airbag 131, and the expanded inflatable airbag 131 compresses the gaps between the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12, in other words, in another embodiment of the present invention, the expansion structure 13b adopted is the inflatable airbag 131.
Specifically, the inflatable balloon 131 comprises an inner core 1310 and a membrane 1311, the membrane 1311 is sleeved on the outer surface of the inner core 1310, two ends of the membrane 1311 are hermetically connected with two ends of the inner core 1310 to form a holding portion 1312, and an inflatable space 1313 is formed between the middle portion of the membrane 1311 and the middle portion of the inner core 1310. An inflation channel for inflating the inflation space 1313 is provided between the inner core 1310 and the bladder 1311, or inside the inner core 1310. The membrane bag 1311 is made of a rubber material with good flexibility, and the inner core 1310 may be a cylindrical body or a tubular body made of metal or other materials with certain hardness, so that when the inflation space 1312 is inflated, the membrane bag 1311 is ensured to expand in a direction away from the inner core 1310 to extrude the first tube layer 10, and the holding is also facilitated.
While step S13 is executed or after step S13 is executed, the inflatable bladder 131 is first placed in the first tube layer 10, and when step S14 is executed, the inflatable space 1313 of the inflatable bladder 131 is inflated to expand the inflatable bladder 131 and press the first tube layer 10, so that the inner diameter and the outer diameter of the first tube layer 10 are expanded, and the first tube layer 10, the reinforcing ribs 11 and the second tube layer 12 are tightly attached (as shown in fig. 6). Therefore, the expansion structure 13b of the inflatable air bag 131 is suitable for preparing the enhanced medical cannulas 1 with different sizes, the expansion degree can be controlled by controlling the amount of the blown air, and the operation is flexible and convenient.
In summary, the manufacturing method of the enhanced medical cannula provided by the invention adopts the formed first tube layer and the second tube layer, the reinforcing rib is arranged between the first tube layer and the second tube layer to assemble an integral body, and at least one of the first tube layer and the second tube layer is heated again to enable the first tube layer and the second tube layer to be welded, so that the reinforcing rib of the enhanced medical cannula has better coating performance, the first tube layer, the reinforcing rib and the second tube layer are not easy to be peeled off, the product quality is better, the manufacturing efficiency is greatly improved, the production cost is reduced, and the enhanced medical cannula has greater market competitiveness.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for manufacturing an enhanced medical cannula is characterized by comprising the following steps:
providing a first tube layer, a reinforcing rib and a second tube layer;
disposing the stiffener between the outer surface of the first tube layer and the inner surface of the second tube layer;
and heating at least one of the first tube layer and the second tube layer to enable the first tube layer and the second tube layer to be welded and to coat the reinforcing ribs.
2. The method of making an enhanced medical cannula of claim 1, further comprising the step of compressing the gap between the first tube layer, the reinforcing rib, and the second tube layer after the step of disposing the reinforcing rib between the first tube layer and the second tube layer.
3. The method of manufacturing an enhanced medical cannula of claim 2 wherein the step of compressing the gap between the first tube layer, the reinforcing rib and the second tube layer comprises the substeps of:
providing a compression structure in an outer surface of the second tube layer and/or an expansion structure in the first tube layer;
heating the compression structure and/or the expansion structure such that the compression structure and/or the expansion structure compresses the gap between the first tube layer, the reinforcement rib, and the second tube layer.
4. The method of making an enhanced medical cannula according to claim 3, wherein the compression structure is a heat shrink tube.
5. The method of claim 3 further comprising the step of removing the compression feature and/or the expansion feature after the step of heating at least one of the first tube layer and the second tube layer to fuse the first tube layer to the second tube layer and to encapsulate the reinforcing ribs.
6. The method of claim 3, wherein heating at least one of the first and second layers to fuse the first and second layers and to encapsulate the reinforcing ribs heats the compression and/or expansion structures, the compression and/or expansion structures transferring heat to the second and/or first layers to heat the second and/or first layers.
7. The method of manufacturing an enhanced medical cannula of claim 2 wherein the step of compressing the gap between the first tube layer, the reinforcing rib and the second tube layer comprises the substeps of:
arranging an inflatable air bag in the first tube layer;
and inflating the inflatable air bag to expand the inflatable air bag, wherein the expanded inflatable air bag compresses the gap between the first tube layer, the reinforcing rib and the second tube layer.
8. The method of claim 1, wherein the step of heating at least one of the first and second layers to fuse the first and second layers and to coat the reinforcing rib heats the first and second layers by heating the reinforcing rib.
9. A reinforced medical cannula, characterized in that it is manufactured using the method of manufacturing a reinforced medical cannula according to any of claims 1-8.
10. The enhanced medical cannula of claim 9, wherein the enhanced medical cannula is a straight tube or a reducer tube.
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| CN201910574424.1A CN110789129A (en) | 2019-06-28 | 2019-06-28 | Enhanced medical cannula and manufacturing method thereof |
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