CN111672008B - Medical variable-diameter intubation tube forming process and intubation tube - Google Patents
Medical variable-diameter intubation tube forming process and intubation tube Download PDFInfo
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- CN111672008B CN111672008B CN202010470880.4A CN202010470880A CN111672008B CN 111672008 B CN111672008 B CN 111672008B CN 202010470880 A CN202010470880 A CN 202010470880A CN 111672008 B CN111672008 B CN 111672008B
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- 238000002627 tracheal intubation Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 85
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000003292 glue Substances 0.000 abstract description 10
- 239000008280 blood Substances 0.000 abstract description 8
- 210000004369 blood Anatomy 0.000 abstract description 8
- 238000003466 welding Methods 0.000 abstract description 8
- 230000004927 fusion Effects 0.000 abstract description 7
- 238000003780 insertion Methods 0.000 abstract description 7
- 230000037431 insertion Effects 0.000 abstract description 7
- 230000010354 integration Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 210000001367 artery Anatomy 0.000 abstract description 2
- 210000003462 vein Anatomy 0.000 abstract description 2
- 241001631457 Cannula Species 0.000 description 7
- 208000007536 Thrombosis Diseases 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000017531 blood circulation Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002618 extracorporeal membrane oxygenation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Classifications
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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
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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
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
-
- 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
- B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
- B29C65/68—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using auxiliary shrinkable elements
-
- 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
- B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Heart & Thoracic Surgery (AREA)
- Pulmonology (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Biophysics (AREA)
- Hematology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses a medical reducing intubation forming process, which comprises the following steps: expanding the diameter of the end part of the insertion pipe body, performing interference fit on the diameter-expanded end of the reducing joint and the end part of the insertion pipe body after the diameter-expanded treatment to form an interference connection part, sleeving a heat-shrinkable sleeve on the interference connection part, heating the heat-shrinkable sleeve outside the interference connection part to thermally shrink the heat-shrinkable sleeve and cover the interference connection part, and welding the reducing joint of the interference connection part and the insertion pipe body; the invention also discloses a cannula. This application is through the reducer union with interference fit and the butt fusion of intubate main part for the reducer union is connected with intubate main part integration, and seamless production, and avoids using glue, and the blood condition can not destroyed after the sound arteries and veins intubate uses for a long time yet, has guaranteed the pressure drop level of intubate.
Description
Technical Field
The invention relates to the technical field of arteriovenous intubation, in particular to a medical variable-diameter intubation forming process and an intubation.
Background
Arteriovenous cannulas (including arterial cannulas, venous cannulas, femoral arteriovenous cannulas, long-acting ECMO femoral arteriovenous cannulas and the like) are medical instruments widely applied in the operation process. Referring to fig. 1, fig. 1 is a schematic structural view of an intubation tube main body and a reducer union. The arteriovenous intubation comprises an intubation main body 1 and a reducer union 2, wherein the reducer union 2 is provided with a reducer end 21, the reducer end 21 is matched with the intubation main body 1, and when the connection is carried out, the end part of the intubation main body 1 needs to be inserted into the reducer end 21 of the reducer union 2 for connection. In order to ensure the connection effect between the end of the cannula body 1 and the inner wall of the reducer end 21, a step structure (not shown) is often formed on the inner wall of the reducer end 21, the step structure is adapted to the thickness of the tube wall of the cannula body 1, the end of the cannula body 1 is inserted into the reducer end 21 and abuts against the step structure on the inner wall of the reducer end 21, and then the connection is performed by glue.
The above-mentioned step-fitting structure of the main body 1 of the insert pipe and the reducer union 2 and the manner of gluing cause the following problems:
first, the end of the cannula body 1 cannot fully engage the step structure inside the reducer end 21, which inevitably results in gaps through which blood swirls or which traps blood and eventually forms thrombus.
Second, because the arteriovenous cannula is used on a human body, it requires a long time to contact blood, which is very demanding for the biocompatibility of the glue, for example, femoral arteriovenous cannula sometimes requires 30 days of blood circulation, which is a very big challenge for the glue.
Therefore, the arteriovenous cannulas in the prior art are easy to form thrombus and damage blood when applied, and the pressure drop level of the cannulas is seriously influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a forming process of a medical reducing intubation.
The invention discloses a forming process of a medical reducing intubation, which comprises the following steps:
expanding the end of the cannula body;
performing interference fit on the diameter-changing end of the diameter-changing joint and the end part of the cannula main body after diameter-expanding treatment to form an interference connection part;
sleeving the heat-shrinkable sleeve on the interference connection part;
heating the heat-shrinkable sleeve outside the interference connection part; and thermally shrinking the heat-shrinkable sleeve and coating the heat-shrinkable sleeve on the interference connecting part, and welding the reducer union of the interference connecting part with the intubation main body.
According to one embodiment of the invention, the diameter of the end part of the intubation main body is expanded through the reducing mandrel;
and sleeving the reducing joint on the reducing mandrel, and enabling the reducing end to be in interference fit with the end part of the intubation main body after the diameter expansion treatment to form an interference connection part.
According to an embodiment of the present invention, it further comprises:
after the heat-shrinkable sleeve is cooled, tearing off the heat-shrinkable sleeve after heat shrinkage;
and taking down the reducing mandrel.
According to an embodiment of the present invention, the method for expanding the diameter of the end portion of the cannula body further includes:
the end of the cannula body is cut to reserve an expanded diameter portion.
According to an embodiment of the invention, the length of the expanded diameter portion is equal to or greater than 2mm.
According to an embodiment of the present invention, the heating temperature is between 150 to 250 degrees celsius.
According to one embodiment of the invention, the heating time is between 2 and 5 minutes.
According to an embodiment of the present invention, the material of the heat shrinkable sleeve is one of EVA, FEP, PE, or PTFE; the cannula main body and the reducing joint are made of polyurethane.
According to an embodiment of the invention, the diameter of the heat-shrinkable sleeve outside the interference connection portion after heat shrinking is smaller than the outer diameter of the reducer end.
An intubation tube formed by adopting a medical reducing intubation tube forming process comprises an intubation tube main body and a reducing joint; the reducer union is provided with a reducer end; the end part of the intubation main body is welded with the reducing end of the reducing joint.
The beneficial effect of this application lies in: through reducer union and the butt fusion of intubate main part with interference fit for reducer union is connected with intubate main part integration, and seamless production, and avoid using glue, and the blood condition can not also not destroyed to the sound arteries and veins intubate after long-time the use, has guaranteed the pressure drop level of intubate. And heat-shrinkable tube not only can protect the welded reducer union and the surface of intubate main part, can inwards form the shrink power when heat-shrinkable tube pyrocondensation, and this shrink power can assist reducer union and intubate main part butt fusion as an organic whole.
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 structural view of a cannula body and a reducer union;
FIG. 2 is a flow chart of a forming process of the variable diameter cannula for traditional Chinese medicine of the present embodiment;
FIG. 3 is a schematic structural view of the main body of the insert tube, the reducer union, the heat-shrinkable sleeve and the reducer mandrel in this embodiment;
FIG. 4 is a schematic view of the diameter expanding mandrel expanding the end of the main body of the intubation tube in this embodiment;
FIG. 5 is a schematic view of an interference fit structure between the main body of the stinger and the reducer union of this embodiment;
FIG. 6 is a diagram illustrating a fitting relationship between the shrink sleeve, the insert pipe body, the reducer union and the reducer mandrel in this embodiment;
FIG. 7 is a schematic view of a fusion structure of the stinger body and the reducer union of this 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 indicators in the embodiments of the present invention, such as up, down, left, right, front, and back, 8230, are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are used for descriptive purposes only, do not specifically refer to an order or sequence, and do not limit the present invention, but merely distinguish components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicitly indicating the number of technical features indicated. 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 flowchart of a forming process of a reducing insertion tube for traditional Chinese medicine in the embodiment, and fig. 3 is a schematic structural diagram of the insertion tube main body, the reducer union, the heat-shrinkable sleeve and the reducing mandrel in the embodiment. The forming process of the medical reducing cannula in the embodiment comprises the following steps:
s1, the diameter of the end of the cannula body 1 is expanded.
And S2, performing interference fit on the diameter-variable end 21 of the reducer union 2 and the end part of the cannula body 1 after diameter expansion to form an interference connection part.
And S3, sleeving the heat-shrinkable sleeve 200 on the interference connection part.
And S4, heating the heat-shrinkable sleeve 200 outside the interference connection part, so that the heat-shrinkable sleeve 200 is heat-shrunk and coated on the interference connection part, and the reducer union 2 of the interference connection part is welded with the cannula main body 1.
Through the reducer union 2 with interference fit and the 1 butt fusion of intubate main part for reducer union 2 is connected with intubate main part 1 integration, and seamless production, and avoid using glue, the blood condition can not destroyed after the arteriovenous intubate is used for a long time yet, has guaranteed the pressure drop level of intubate. The heat-shrinkable sleeve 200 not only protects the surfaces of the welded reducer union 2 and the intubation main body 1, but also inwardly forms a shrinkage force when the heat-shrinkable sleeve 200 is heat-shrunk, and the shrinkage force assists the welding of the reducer union 2 and the intubation main body 1 into a whole.
Referring back to fig. 2 and 3, further, the method further includes, before the step S1 of expanding the diameter of the end portion of the tube main body 1: s0, cutting the end part of the cannula body 1 to reserve an expanded diameter part 11.
The cannula body 1 is tubular and made of polyurethane. It can be understood that the cannula body 1 needs to be cut to a proper length before being applied and assembled to the arteriovenous cannula, so that the cannula body can be matched with the reducer union 2 of the arteriovenous cannula to be connected with the spring assembly of the arteriovenous cannula. Since the tube body 1 is made of polyurethane, which is thin, the tube diameter thereof can be enlarged by an external force. The end of the cannula body 1 in this embodiment is welded to the reducing end 21 of the reducing structure 2, and the length of the end to be welded of the cannula body 1, that is, the length to be subjected to the diameter expansion processing, is required to reserve the diameter expansion portion 11, that is, the end to be welded, when the cannula body 1 is cut. The length of the diameter-expanded portion 11 is 2mm or more, and a length of 2mm of the diameter-expanded portion 11 is used in this embodiment.
Referring to fig. 2 again, further, the forming process of the medical reducing cannula in the embodiment includes the following steps:
and S5, tearing off the heat-shrinkable sleeve 200 after the heat-shrinkable sleeve is cooled.
And S6, taking down the reducing mandrel 100.
And tearing off the heat-shrinkable sleeve 200, and taking down the reducing mandrel 100 to obtain a finished product after the intubation main body 1 and the reducing joint 2 are welded.
Referring to fig. 4, fig. 4 is a schematic view illustrating the diameter of the end of the cannula body expanded by the reducing mandrel in the present embodiment. Further, in step S1, the diameter of the end of the cannula body 1 is expanded by the reducing mandrel 100. Specifically, the reducing mandrel 100 includes a first shaft portion 101 and a second shaft portion 102 that are integrally formed, wherein an outer diameter of the first shaft portion 101 is adapted to an inner diameter of the cannula body 1, and preferably, the outer diameter of the first shaft portion 101 is the same as the inner diameter of the cannula body 1, so that the cannula body 1 can be sleeved outside the first shaft portion 101 and attached to an outer wall of the first shaft portion 101. The second shaft portion 102 has an outer diameter that gradually increases from an end near the first shaft portion 101 toward an end away from the first shaft portion 101. As described above, when the cannula body 1 moves from the first shaft portion 101 to the second shaft portion 102, the end portion of the cannula body 1 is gradually enlarged to form a substantially horn-shaped structure.
In specific applications, one end of the cannula body 1 having the enlarged diameter part 11 is sleeved outside the first shaft part 101 from the first shaft part 101, and then the enlarged diameter part 11 is moved toward the second shaft part 102, so that the 2 mm-long enlarged diameter part 11 is expanded and transits to the second shaft part 102, and the expanded enlarged diameter part 11 is attached to the second shaft part 102 only. The reducing mandrel 100 in this embodiment is made of stainless steel.
Referring to fig. 5, fig. 5 is a schematic view of an interference fit structure between the stinger body and the reducer union in this embodiment. Further, in step S2, the reducer joint 2 is fitted over the reducer mandrel 100, and the diameter-reduced end 21 is interference-fitted to the end of the tube body 1 after the diameter expansion process, thereby forming an interference connection.
Specifically, the reducer union 2 is a reducer pipe made of polyurethane. The reducer union 2 has a reducer end 21, and the reducer end 21 in this embodiment is the end of the reducer union 2 having the smaller diameter. The tube wall thickness of the reducer union 2 is larger than that of the cannula body 1, and the diameter of the reducer union 2 is more difficult to be expanded than that of the cannula body 1. The reducer union 2 is matched with the second shaft part 102 of the reducer mandrel 100, and when the reducer union 2 is sleeved on the second shaft part 102, the inner wall of the reducer union 2 is just attached to the outer wall of the second shaft part 102. In this way, when the diameter-enlarged part 11 of the insert pipe body 1 is fitted over the second shaft part 102 and then the reducer joint 2 is fitted over the second shaft part 102, the diameter-enlarged part 11 is increased between the second shaft part 102 and the reducer end 21, and the large-thickness reducer end 21 is shrunk inward, so that the diameter-enlarged part 11 of the insert pipe body 1 is inevitably in interference fit with the reducer end 21 of the reducer joint 2. The position of the diameter expansion fit 11 is the interference connection part.
In a specific application, one end of the reducer union 2 with a larger diameter is sleeved outside the cannula body 1, and then the end is moved towards the second shaft part 102, so that the diameter-reducing end 21 of the reducer union 2 is sleeved outside the diameter-expanding part 11 with the diameter of 2mm, and an interference connection part is formed at the position of the diameter-expanding part 11.
Referring to fig. 6, fig. 6 is a diagram illustrating a relationship among the shrink sleeve, the insert pipe body, the reducer union, and the reducer mandrel in this embodiment. Further, in step S3, the heat shrinkable sleeve 200 is sleeved outside the interference connection portion. At this time, the diameter of the heat-shrinkable sleeve 200 before heat-shrinking is larger than the outer diameter of the reducer union 2, so that the heat-shrinkable sleeve 200 can be integrally sleeved on the reducer union 2 and can extend to be sleeved outside the insertion pipe main body 1 to cover the outer walls of the reducer union 2 and the insertion pipe main body 1 which are subjected to subsequent hot melting, and protection is formed. In this embodiment, the heat shrinkable sleeve 200 is made of one of EVA, FEP, PE, or PTFE, and shrinks inward when heated.
In step S4, the heat shrink sleeve 200 outside the interference fit connection is heated. Specifically, a heating device, such as a heat gun, is used to heat the heat shrinkable sleeve 200 outside the interference fit connection. In order to improve the heating stability, a customized heating furnace may be used to provide a stable heating cavity, the height of the heating cavity is adapted to the length of the interference connection portion, and the heat shrinkage bush 200 is fittingly sleeved on the interference connection portion for heating.
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.
The reducer union 2 of the interference connection part is welded with the cannula body 1, namely, under the heating environment of the heating temperature and the heating time, the diameter expanding part 11 of the cannula body 1 and the diameter reducing end 21 of the reducer union 2 which are made of polyurethane are positioned at the critical point of material melting, so that the diameter expanding part 11 of the cannula body 1 and the diameter reducing end 21 of the reducer union 2 which are in interference fit are melted and integrally connected, the integral structure of the cannula body 1 and the reducer union 2 cannot be damaged, and the quality of a final finished product is not influenced. Further, the enlarged diameter portion 11 of the socket body 1 and the reduced diameter end 21 of the reducer union 2 are heated through the heat shrinkable sleeve 200, and thus do not directly act on the surfaces of the socket body 1 and the reducer union 2, thereby protecting the socket body 1 and the reducer union 2.
Meanwhile, under the heating environment of the heating temperature and the heating time, the heat-shrinkable sleeve 200 is heat-shrunk and covers the interference connection part, at this time, the diameter of the heat-shrinkable sleeve 200 positioned outside the interference connection part after heat shrinking is smaller than the outer diameter of the reducing end 21, and the heat-shrinkable sleeve 200 inwardly forms a shrinkage force which acts on the diameter expansion part 11 of the intubation tube body 1 and the reducing end 21 of the reducer union 2 in a molten state, so as to assist the welding process.
The fusion welding forms the cannula main part 1 and the reducing joint 2 which are connected integrally, so that the use of glue can be avoided, and a series of problems caused by the biocompatibility of the glue do not need to be considered. Moreover, the connecting force of the same-material intubation main body 1 and the reducing joint 2 which are welded together is larger than the adhesive force of glue, and the quality of a final finished product is improved. In addition, no connection gap is generated in the welding process, and the problem of blood flow vortex or thrombus formation caused by blood collection caused by the connection gap is not considered.
Referring to FIG. 7, FIG. 7 is a schematic view of the fusion structure of the stinger body and the reducer union of this embodiment. Further, after the cannula body 1 and the reducer union 2 are welded, the reducer mandrel 100, the heat-shrinkable sleeve 200 after heat-shrinking, and the cannula body 1 and the reducer union 2 after welding are taken out from the heating device together, and natural cooling or air-blown cooling is performed.
Then, in step S5, the heat-shrinkable heat shrinkable sleeve 200 is torn off after cooling. In step S6, the reducing mandrel 100 is removed, and a welded finished product is obtained, which is to be assembled with the arteriovenous cannula, and will not be described herein again.
Referring to fig. 7 again, the cannula formed by the medical reducing cannula forming process in the embodiment comprises a cannula main body 1 and a reducing joint 2; the reducer union has a reducing end 21, the cannula body has an enlarged diameter part 11, and the enlarged diameter part 11 of the cannula body 1 and the reducing end 21 of the reducer union 2 are welded together, so that the cannula forms an integral whole.
In conclusion, the intubation main body and the reducer union are integrally connected in a welding mode, so that glue is prevented from being used, gaps caused by steps are eliminated, and the quality of the final arteriovenous intubation is improved.
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 (7)
1. A medical reducing intubation forming process is characterized by comprising the following steps:
cutting the end part of the cannula body to reserve an expanding part;
expanding the end of the intubation main body by a reducing mandrel;
sleeving a reducing joint on the reducing mandrel, and enabling a reducing end to be in interference fit with the end part of the cannula main body after the diameter expansion treatment to form an interference connection part; the diameter-variable end is the end with the diameter smaller than that of the reducer union, and the wall thickness of the pipe wall of the reducer union is larger than that of the pipe wall of the intubation tube main body; the diameter-expanding joint is matched with the second shaft part of the diameter-reducing mandrel, when the diameter-expanding joint is sleeved on the second shaft part, the inner wall of the diameter-expanding joint is just attached to the outer wall of the second shaft part, after the diameter-expanding part of the intubation tube main body is sleeved on the second shaft part, the diameter-expanding part is sleeved outside the second shaft part, the diameter-expanding part is increased between the second shaft part and the diameter-reducing end, the diameter-reducing end with the larger wall thickness is contracted inwards, and at the moment, the diameter-expanding part of the intubation tube main body is in interference fit with the diameter-reducing end of the diameter-expanding joint; the cannula main body and the reducing joint are made of polyurethane;
sleeving a heat-shrinkable sleeve on the interference connection part;
heating the heat-shrinkable sleeve outside the interference connection part; enabling the heat-shrinkable sleeve to be subjected to heat shrinkage and to be coated on the interference connection part, and enabling the reducer union of the interference connection part to be welded with the cannula main body; the diameter of the heat-shrinkable sleeve outside the interference connection part after heat shrinkage is smaller than the outer diameter of the diameter-variable end.
2. The forming process of the medical reducing cannula according to claim 1, further comprising:
after the heat-shrinkable sleeve is cooled, tearing off the heat-shrinkable sleeve after heat shrinkage;
and taking down the reducing mandrel.
3. The forming process of the medical reducing cannula according to claim 1, wherein the length of the diameter expanding part is equal to or more than 2mm.
4. The process for forming the medical reducing cannula according to any one of claims 1 to 3, wherein the heating temperature is between 150 and 250 ℃.
5. The process for forming the medical reducing cannula according to any one of claims 1 to 3, wherein the heating time is between 2 and 5 minutes.
6. The forming process of the medical reducing cannula according to any one of claims 1 to 3, wherein the heat-shrinkable sleeve is made of one of EVA, FEP, PE or PTFE.
7. An intubation tube formed by the medical reducing intubation tube forming process of any one of claims 1 to 6, which comprises an intubation tube main body and a reducing joint; the reducer union has a reducer end; the end part of the intubation main body is welded with the reducing end of the reducing joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010470880.4A CN111672008B (en) | 2020-05-28 | 2020-05-28 | Medical variable-diameter intubation tube forming process and intubation tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010470880.4A CN111672008B (en) | 2020-05-28 | 2020-05-28 | Medical variable-diameter intubation tube forming process and intubation tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111672008A CN111672008A (en) | 2020-09-18 |
| CN111672008B true CN111672008B (en) | 2023-02-10 |
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| CN202010470880.4A Active CN111672008B (en) | 2020-05-28 | 2020-05-28 | Medical variable-diameter intubation tube forming process and intubation tube |
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| CN114321519A (en) * | 2020-09-28 | 2022-04-12 | 南京菲斯特焊接科技有限公司 | Reducing plastic hose and forming method |
| CN112604126B (en) * | 2020-11-30 | 2022-12-27 | 东莞科威医疗器械有限公司 | Medical variable-diameter intubation tube forming process and intubation tube |
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| US5863366A (en) * | 1995-06-07 | 1999-01-26 | Heartport, Inc. | Method of manufacture of a cannula for a medical device |
| JP2002295742A (en) * | 2001-03-28 | 2002-10-09 | Toyoda Gosei Co Ltd | Hose |
| JP2017184791A (en) * | 2016-03-31 | 2017-10-12 | オリンパス株式会社 | Tube fusing method and tube fusing apparatus |
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| US4748982A (en) * | 1987-01-06 | 1988-06-07 | Advanced Cardiovascular Systems, Inc. | Reinforced balloon dilatation catheter with slitted exchange sleeve and method |
| US6533770B1 (en) * | 1998-01-21 | 2003-03-18 | Heartport, Inc. | Cannula and method of manufacture and use |
| US7322988B2 (en) * | 2003-01-17 | 2008-01-29 | Boston Scientific Scimed, Inc. | Methods of forming catheters with soft distal tips |
| EP2018336B1 (en) * | 2006-05-18 | 2018-08-22 | Applied Medical Resources Corporation | Method of making medical tubing having variable characteristics using thermal winding |
| JP6006091B2 (en) * | 2012-11-13 | 2016-10-12 | テルモ株式会社 | catheter |
| CN203777471U (en) * | 2014-04-14 | 2014-08-20 | 东莞科威医疗器械有限公司 | Reducing venous cannula |
| CN109568772B (en) * | 2018-11-21 | 2021-03-23 | 北京天地和协科技有限公司 | Variable-diameter central venous catheter and preparation method thereof |
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| US5863366A (en) * | 1995-06-07 | 1999-01-26 | Heartport, Inc. | Method of manufacture of a cannula for a medical device |
| JP2002295742A (en) * | 2001-03-28 | 2002-10-09 | Toyoda Gosei Co Ltd | Hose |
| JP2017184791A (en) * | 2016-03-31 | 2017-10-12 | オリンパス株式会社 | Tube fusing method and tube fusing apparatus |
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