CN111672008A - Medical variable-diameter intubation tube forming process and intubation tube - Google Patents

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 avoid using glue, and the blood condition can not destroyed yet after long-time use to the sound arteries and veins intubate, has guaranteed the pressure drop level of intubate.

Description

Medical variable-diameter intubation tube forming process and intubation tube

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 cannula comprises a cannulamain body 1 and a reducingjoint 2, wherein the reducingjoint 2 is provided with a reducingend 21, the reducingend 21 is matched with the cannulamain body 1, and when the connection is carried out, the end part of the cannulamain body 1 needs to be inserted into the reducingend 21 of the reducingjoint 2 for connection. In order to ensure the connection effect between the end of thecannula body 1 and the inner wall of thereducer end 21, a step structure (not shown) is often formed on the inner wall of thereducer end 21, the step structure is adapted to the thickness of the tube wall of thecannula body 1, the end of thecannula body 1 is inserted into thereducer end 21 and abuts against the step structure on the inner wall of thereducer end 21, and then the connection is performed by glue.

The above-mentioned step-fitting structure of themain body 1 of the insert pipe and thereducer union 2 and the manner of gluing cause the following problems:

first, the end of thecannula body 1 cannot fully engage the step structure inside thereducer 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 medical reducing intubation forming process.

The invention discloses a medical reducing intubation forming process, 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 (3) thermally shrinking the heat-shrinkable sleeve and coating the heat-shrinkable sleeve on the interference connection part, and welding the reducer union of the interference connection part with the cannula 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 insertion pipe 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 2 mm.

According to an embodiment of the present invention, the heating temperature is between 150 and 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 one 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 diameter-variable 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 illustrating the diameter of the end of the main body of the reducer mandrel in the present embodiment;

FIG. 5 is a schematic view of an interference fit structure between the stinger body 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 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 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 thecannula body 1 is expanded.

And S2, performing interference fit on the diameter-reducingend 21 of thereducer union 2 and the end part of thecannula 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 thereducer union 2 of the interference connection part is welded with the cannulamain body 1.

Through thereducer union 2 with interference fit and the butt fusion of intubatemain part 1 forreducer union 2 is connected with intubatemain part 1 integration, and seamless production, and avoid using glue, the blood condition can not also not destroyed after long-time use to the sound arteries and veins intubate, has guaranteed the pressure drop level of intubate. The heat-shrinkable sleeve 200 not only protects the surfaces of the weldedreducer union 2 and thecannula 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 thereducer union 2 and thecannula body 1 into a whole.

Referring back to fig. 2 and 3, further, in step S1, the method for expanding the diameter of the end portion of thecannula body 1 further includes: s0, the end of thecannula body 1 is cut to leave the enlargeddiameter portion 11.

Thecannula body 1 is tubular and made of polyurethane. It can be understood that thecannula 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 thereducer union 2 of the arteriovenous cannula to be connected with the spring assembly of the arteriovenous cannula. Since the tube wall of thecannula body 1 is thin and made of polyurethane, the tube diameter thereof can be enlarged by an external force. The end of thecannula body 1 in this embodiment is welded to the reducingend 21 of the reducingstructure 2, and the length of the end to be welded of thecannula body 1, that is, the length to be subjected to the diameter expansion processing, is required to reserve thediameter expansion portion 11, that is, the end to be welded, when thecannula body 1 is cut. The length of the expandeddiameter portion 11 is 2mm or more, and a 2mm long expandeddiameter 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:

s5, after the heat shrinkable sleeve is cooled, the heat shrinkablesleeve 200 is torn off.

And S6, removing the reducingmandrel 100.

And tearing off the heat-shrinkable sleeve 200, and taking down the reducingmandrel 100 to obtain a finished product after the intubationmain 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 thecannula body 1 is expanded by the reducingmandrel 100. Specifically, the reducingmandrel 100 includes afirst shaft portion 101 and asecond shaft portion 102 that are integrally formed, wherein an outer diameter of thefirst shaft portion 101 is adapted to an inner diameter of thecannula body 1, and preferably, the outer diameter of thefirst shaft portion 101 is the same as the inner diameter of thecannula body 1, so that thecannula body 1 can be sleeved outside thefirst shaft portion 101 and attached to an outer wall of thefirst shaft portion 101. Thesecond shaft portion 102 has an outer diameter that gradually increases from an end near thefirst shaft portion 101 toward an end away from thefirst shaft portion 101. As described above, when thecannula body 1 moves from thefirst shaft portion 101 to thesecond shaft portion 102, the end portion of thecannula body 1 is gradually enlarged to form a substantially horn-shaped structure.

In a specific application, one end of thecannula body 1 having theenlarged diameter part 11 is sleeved outside thefirst shaft part 101 from thefirst shaft part 101, and then theenlarged diameter part 11 is moved toward thesecond shaft part 102, so that theenlarged diameter part 11 of 2mm length is expanded and transited to thesecond shaft part 102, and the expandedenlarged diameter part 11 is attached to only thesecond shaft part 102. The reducingmandrel 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, thereducer union 2 is fitted over thereducer mandrel 100, and the diameter-enlargedend 21 is interference-fitted to the end of thecannula body 1 after the diameter-enlargement process, thereby forming an interference joint.

Specifically, thereducer union 2 is a reducer pipe made of polyurethane. Thereducer union 2 has areducer end 21, and thereducer end 21 in this embodiment is the end of thereducer union 2 having the smaller diameter. The tube wall thickness of thereducer union 2 is larger than that of thecannula body 1, and the diameter of thereducer union 2 is more difficult to be expanded than that of thecannula body 1. Thereducer union 2 is matched with thesecond shaft part 102 of thereducer mandrel 100, and when thereducer union 2 is sleeved on thesecond shaft part 102, the inner wall of thereducer union 2 is just attached to the outer wall of thesecond shaft part 102. In this way, after theenlarged diameter portion 11 of theinsert tube body 1 is fitted over thesecond shaft portion 102, and thereducer union 2 is fitted over thesecond shaft portion 102, theenlarged diameter portion 11 is increased between thesecond shaft portion 102 and thereducer end 21, and thereducer end 21 having a large wall thickness is shrunk inward, so that theenlarged diameter portion 11 of theinsert tube body 1 is inevitably in interference fit with thereducer end 21 of thereducer union 2. The position of the diameter expansion fit 11 is the interference connection part.

In a specific application, one end of thereducer union 2 with a larger diameter is sleeved outside thecannula body 1, and then thereducer union 2 is moved towards thesecond shaft part 102, so that the reducingend 21 of thereducer union 2 is sleeved outside the diameter-expandedpart 11 with the diameter of 2mm, and an interference connection part is formed at the position of the diameter-expandedpart 11.

Referring to fig. 6, fig. 6 is a diagram illustrating a relationship between the shrink sleeve, the insert pipe body, the reducer union and the reducer mandrel in this embodiment. Further, in step S3, the heat shrinkablesleeve 200 is sleeved on 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 thereducer union 2, so that the heat-shrinkable sleeve 200 can be integrally sleeved on thereducer union 2 and can extend to be sleeved outside the insertion pipemain body 1 to cover the outer walls of thereducer union 2 and the insertion pipemain body 1 which are subjected to subsequent hot melting, and protection is formed. In this embodiment, the heat shrinkablesleeve 200 is made of one of EVA, FEP, PE, or PTFE, and shrinks inward when heated.

In step S4, theheat 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 shrinkablesleeve 200 outside the interference fit connection. In order to improve the heating stability, a customized heating furnace can be adopted to provide a heating cavity which can be stably heated, the height of the heating cavity is matched with the length of the interference connection part, and the heat-shrinkable sleeve 200 which is sleeved outside the interference connection part can be adapted to heat.

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.

Thereducer union 2 of the interference connection part is welded with thecannula body 1, namely, under the heating environment of the heating temperature and the heating time, thediameter expanding part 11 of thecannula body 1 and thediameter reducing end 21 of thereducer union 2 which are made of polyurethane are positioned at the critical point of material melting, so that thediameter expanding part 11 of thecannula body 1 and thediameter reducing end 21 of thereducer union 2 which are in interference fit are melted and integrally connected, the integral structure of thecannula body 1 and thereducer union 2 cannot be damaged, and the quality of a final finished product is not influenced. Further, theenlarged diameter portion 11 of thesocket body 1 and the reduced diameter end 21 of thereducer union 2 are heated through the heat shrinkablesleeve 200, and thus do not directly act on the surfaces of thesocket body 1 and thereducer union 2, thereby protecting thesocket body 1 and thereducer union 2.

Meanwhile, under the heating environment of the heating temperature and the heating time, the heat-shrinkable sleeve 200 is heat-shrunk and coated on 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 reducingend 21, the heat-shrinkable sleeve 200 inwardly forms a shrinkage force, and the shrinkage force acts on thediameter expansion part 11 of thecannula body 1 and the reducingend 21 of thereducer union 2 in a molten state to assist the welding process.

The fusion welding forms the cannulamain 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 cannulamain 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 thecannula body 1 and thereducer union 2 are welded, thereducer mandrel 100, the heat-shrinkable sleeve 200 after heat-shrinking, and thecannula body 1 and thereducer 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 shrinkablesleeve 200 is torn off after cooling. In step S6, the reducingmandrel 100 is removed, and a welded 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 cannulamain body 1 and a reducing joint 2; the reducer union has a reducingend 21, the cannula body has anenlarged diameter part 11, and theenlarged diameter part 11 of thecannula body 1 and the reducingend 21 of thereducer 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 (10)

1. A medical reducing intubation forming process is characterized by comprising 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 the diameter-expanding 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; 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 cannula main body.

2. The medical reducing intubation forming process according to claim 1, wherein the end of the intubation body is subjected to diameter expansion by a 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 cannula main body after the diameter expansion treatment to form an interference connection part.

3. The forming process of the medical reducing cannula according to claim 2, further comprising:

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

and taking down the reducing mandrel.

4. The forming process of the medical reducing cannula according to claim 1, wherein the end of the cannula body is expanded, and the forming process further comprises the following steps:

and cutting the end part of the cannula main body to reserve an expanding part.

5. The forming process of the medical reducing cannula according to claim 4, wherein the length of the diameter expanding part is equal to or more than 2 mm.

6. The process for forming the medical reducing cannula according to any one of claims 1 to 5, wherein the heating temperature is between 150 and 250 ℃.

7. The process for forming the medical reducing cannula according to any one of claims 1 to 5, wherein the heating time is between 2 and 5 minutes.

8. The forming process of the medical reducing cannula according to any one of claims 1 to 5, wherein the heat-shrinkable sleeve is made of one of EVA, FEP, PE or PTFE; the cannula main body and the reducing joint are made of polyurethane.

9. The forming process of the medical reducing cannula according to any one of claims 1 to 5, wherein the diameter of the heat-shrinkable sleeve outside the interference connection part after heat-shrinking is smaller than the outer diameter of the reducing end.

10. An intubation tube formed by the medical reducing intubation tube forming process according to any one of claims 1 to 9, 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.

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