CN112604126B - 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: sleeving the intubation main body on the reducing mandrel; sleeving the sleeve main body outside the cannula main body and the reducing mandrel; sleeving a heat-shrinkable sleeve outside the sleeve main body; heating the heat-shrinkable sleeve, and heat-shrinking the heat-shrinkable sleeve and coating the heat-shrinkable sleeve on the sleeve main body to ensure that the sleeve main body is adapted to the reducing mandrel to reduce the diameter and ensure that the sleeve main body and the intubation main body are welded; the invention also discloses a cannula. This application substitutes the reducing adapter who has the reducing structure through sleeve pipe main part and participates in the shaping of reducing intubate, sleeve pipe main part's shaping is more simple than reducing adapter's shaping, and sleeve pipe main part's shaping yields is high, the shaping cost is also lower, and the intubate main part is the integrated structure of butt fusion state with sleeve pipe main part, the seamless production of the reducing intubate of producing, blood flows smoothly in the intubate, prevent the dead angle position of blood flow from appearing, pressure loss is reduced, reduce the blood destruction condition that long-time use caused.

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

The patent with the publication number of CN111672008A discloses a forming process of a medical reducing intubation. In the medical reducing intubation forming process, a scheme that the reducing end of the reducing joint is in interference fit with the end part of the intubation main body and then is welded is adopted, wherein the reducing joint with the reducing end is a necessary characteristic of the scheme, and the medical reducing intubation forming process can be carried out only by producing the reducing joint with the reducing end first.

In the prior art, the reducing joint with the reducing end or the reducing structure needs to be injection molded through an injection molding process, however, due to the existence of the reducing structure, the injection molding and demolding of the reducing joint are very difficult, the produced injection molding parts have more defective products, and the manufacturing cost of a reducing joint mold is higher compared with the manufacturing cost of a mold with a regular-shaped joint.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a medical reducing intubation tube forming process and an intubation tube.

The invention discloses a medical reducing intubation forming process, which comprises the following steps:

sleeving the cannula main body on the reducing mandrel;

sleeving the sleeve main body outside the intubation main body and the reducing mandrel;

sleeving a heat-shrinkable sleeve outside the sleeve main body;

the heat-shrinkable sleeve is heated, and is heat-shrinkable and coated on the sleeve main body, so that the sleeve main body is adaptive to the reducing mandrel to reduce the diameter, and the sleeve main body is welded with the pipe inserting main body.

According to an embodiment of the present invention, the reducing mandrel includes a first shaft portion, a reducing shaft portion, and a second shaft portion that are integrally formed.

According to an embodiment of the present invention, the cannula body is sleeved on the first shaft portion, and the cannula body is sleeved outside the cannula body, the variable diameter shaft portion and the second shaft portion.

According to one embodiment of the present invention, the cannula body includes an inner tube, a reinforcing rib, and an outer tube; the method for sleeving the cannula main body on the reducing mandrel comprises the following steps:

sleeving the inner pipe outside the first shaft part, the variable-diameter shaft part and the second shaft part;

the reinforcing rib is sleeved outside the inner pipe;

the outer tube is sleeved outside the reinforcing rib.

According to an embodiment of the present invention, the reinforcing rib is fitted around a portion of the inner tube corresponding to the first shaft portion and the variable diameter shaft portion.

According to an embodiment of the present invention, the outer tube is sleeved on the portion of the stiffener corresponding to the first shaft portion.

According to an embodiment of the present invention, the sleeve body is sleeved outside the inner tube, the reinforcing rib and the outer tube.

According to one embodiment of the present invention, the heat shrinkable sleeve is fitted over the sleeve body and the outer tube.

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.

An intubation tube formed by adopting the medical reducing intubation tube forming process.

The beneficial effect of this application lies in: the reducing joint with the reducing structure is replaced by the sleeve main body to participate in the forming of the reducing insertion pipe, the forming of the sleeve main body is simpler than that of the reducing joint, the forming yield of the sleeve main body is high, and the forming cost is lower. The cannula main body and the sleeve main body are of a welded integrated structure, the produced variable-diameter cannula is seamless, blood flows smoothly in the variable-diameter cannula, and a dead angle position of blood flowing is prevented; the pressure loss of blood in the cannula is reduced, and the blood damage caused by long-time use can be effectively reduced.

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 flow chart of a forming process of a reducing cannula used in traditional Chinese medicine;

FIG. 2 is a schematic structural view of an insert tube body, a reducing mandrel, a sleeve body, and a heat shrinkable sleeve according to an embodiment;

FIG. 3 is a schematic view of a structure of an insert tube body and a reducing mandrel according to an embodiment;

FIG. 4 is an enlarged view of the portion A of FIG. 3 according to the first embodiment;

FIG. 5 is a schematic view of a structure of an insert tube body, a reducing mandrel, and a sleeve body in accordance with an embodiment;

FIG. 6 is a schematic view of a structure of an insert tube body, a reducing mandrel, a sleeve body, and a heat shrinkable sleeve according to an embodiment;

FIG. 7 is a schematic view illustrating a state where an insert tubular body and a sleeve tubular body are welded to each other on a reducing mandrel according to an embodiment;

FIG. 8 is a schematic view of a fusion bonded middle cannula body and a cannula body according to an embodiment;

FIG. 9 is a schematic structural view of an inner tube, an outer tube, a reinforcing rib, a reducing mandrel, a sleeve body, and a heat-shrinkable sleeve according to a second embodiment;

FIG. 10 is a schematic view of the inner tube, the reinforcing ribs, and the outer tube sequentially fitted to the reducing mandrel in the second embodiment;

FIG. 11 is a schematic view of the structure of the second embodiment in which the inner tube, the outer tube, the reinforcing ribs, the reducing mandrel and the sleeve main body are engaged with each other;

FIG. 12 is a schematic view of the second embodiment of a structure in which the inner tube, the outer tube, the reinforcing ribs, the reducing mandrel, the sleeve body, and the heat-shrinkable sleeve are fitted together;

FIG. 13 is a schematic view showing a state in which the middle cannula main body and the cannula main body are welded to each other on the reducing mandrel according to the second embodiment;

FIG. 14 is a schematic structural view of the second embodiment of the welded middle cannula body and the cannula body.

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 for the sake of simplicity.

It should be noted that all directional indicators in the embodiments of the present invention, such as upper, lower, left, right, front and rear \8230; \8230, 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 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.

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

example one

Referring to fig. 1 and 2, fig. 1 is a flowchart illustrating a forming process of a reducing insert tube for use in chinese medicine according to an embodiment, and fig. 2 is a schematic structural view illustrating an insert tube body, a reducing mandrel, a sleeve body, and a heat-shrinkable sleeve according to an embodiment. The forming process of the medical reducing cannula in the embodiment comprises the following steps:

s1, sleeving the cannula main body 1 on the reducing mandrel 2.

And S2, sleeving the sleeve main body 3 outside the intubation main body 1 and the reducing mandrel 2.

And S3, sleeving the heat-shrinkable sleeve 4 outside the sleeve body 3.

S4, the heat-shrinkable sleeve 4 is heated, and the heat-shrinkable sleeve 4 is heat-shrunk and coated on the sleeve main body 3, so that the sleeve main body 3 is adaptive to the reducing mandrel 2 for reducing, and the sleeve main body 3 is welded with the insertion pipe main body 1.

The reducing joint with the reducing structure is replaced by the sleeve main body 3 to participate in the forming of the reducing insertion pipe, the forming of the sleeve main body 3 is simpler than that of the reducing joint, the forming yield of the sleeve main body 3 is high, and the forming cost is lower. The cannula main body 1 and the cannula main body 3 are of an integrated structure in a welded state, the produced medical variable-diameter cannula is seamless, blood flows smoothly in the variable-diameter cannula, and the dead angle position of the blood flow is prevented; the pressure loss of blood in the cannula is reduced, and the blood damage caused by long-time use can be effectively reduced.

The sleeve main body 3 in this embodiment is a regular straight tube, is made of polyurethane, and can be formed by an injection molding process, so that the injection molding and demolding process is easy, the yield is high, and the cost of the injection mold is low. In addition, the regular straight tubular sleeve main body 3 is also directly produced by adopting an extrusion molding process, and particularly, the required polyurethane sleeve main body 3 is directly extruded by the existing extruder, so that the yield of the sleeve main body 3 can be further improved, and the molding cost of the sleeve main body 3 can be further reduced. Therefore, the sleeve main body 3 with higher yield and lower cost can be obtained through the existing mature injection molding process or extrusion process, and then is matched with the reducing mandrel 2, the insertion tube main body 1 and the heat-shrinkable sleeve 4 to form a new medical reducing insertion tube forming process, so that the medical reducing insertion tube forming process can be transformed on the basis of the existing medical reducing insertion tube forming process, and the applicability is high.

Referring to fig. 2 again, the reducing mandrel 2 further includes a first shaft portion 21, a reducing shaft portion 22, and a second shaft portion 23 that are integrally formed. Specifically, the first shaft portion 21 and the second shaft portion 22 are both linear shaft-shaped, and the outer diameter of the first shaft portion 21 is smaller than the outer diameter of the second shaft portion 23. Reducing axial region 22 is the reducing shaft, and reducing axial region 22 external diameter is by the one end of self grow gradually towards the other end of self, and the less external diameter of reducing axial region 22 one end and the external diameter looks adaptation of first axial region 21, the great external diameter of the reducing axial region 22 other end and the external diameter looks adaptation of second axial region 23. One end of the variable diameter shaft portion 22 having a smaller outer diameter is integrally formed with one end portion of the first shaft portion 21, and the other end of the variable diameter shaft portion 22 having a larger outer diameter is integrally formed with one end portion of the second shaft portion 23. The center axes of the first shaft portion 21, the variable diameter shaft portion 22, and the second shaft portion 23 overlap. In a specific application, the first shaft portion 21, the variable diameter shaft portion 22, and the second shaft portion 23 may be integrally formed of stainless steel. The reducing mandrel may be formed by integrally molding the first shaft portion 21 and the reducing shaft portion 22 and then connecting them to the second shaft portion 23, or may be formed by integrally molding the reducing shaft portion 22 and the second shaft portion 23 and then connecting them to the first shaft portion 21. Of course, in other embodiments, the first shaft portion 21, the variable diameter shaft portion 22 and the second shaft portion 23 may be formed separately and then detachably connected together, for example, the first shaft portion 21 and the second shaft portion 23 are round rods, the variable diameter shaft portion 22 is a T-shaped circular truncated cone, and the three are sequentially fixed together by an inner screw. Of course, the overall shape of the reducing mandrel 2 is manufactured according to the shape of the required medical reducing cannula so as to be suitable for reducing cannulas with different shapes, and the whole shape is not limited here.

With reference to fig. 1, 2 and 3, fig. 3 is a schematic structural view illustrating the engagement between the insert tube main body and the reducing mandrel according to the first embodiment, and fig. 4 is an enlarged view of a portion a of fig. 3 according to the first embodiment. Further, in step S1, the cannula body 1 is sleeved on the reducing mandrel 2. Specifically, the cannula body 1 is fitted over the first shaft portion 21 of the variable diameter mandrel 2, and the end portion of the cannula body 1 is adjacent to the variable diameter shaft portion 22. The inner diameter of the cannula body 1 in this embodiment is adapted to the outer diameter of the first shaft portion 21, and the cannula body 1 is fittingly sleeved outside the first shaft portion 21.

Preferably, the cannula body 1 comprises an inner tube 11, a reinforcing rib 12 and an outer tube 13. Inner tube 11 and outer tube 13 are the fashioned straight tube shape of polyurethane material, wherein, the internal diameter of inner tube 11 and the external diameter looks adaptation of first axial region 21, the internal diameter of outer tube 13 is greater than the external diameter of inner tube 11, and be less than the external diameter of second axial region 23, the length of outer tube 13 is the same with the length of inner tube 11, strengthening rib 12 is medical spring, the internal diameter of strengthening rib 12 and the external diameter looks adaptation of inner tube 11, the external diameter of strengthening rib 12 and the internal diameter looks adaptation of outer tube 13, strengthening rib 12 cover is located outside inner tube 11, outer tube 13 cover is located outside strengthening rib 12. The cannula body 1 is obtained by integrally welding the inner tube 11, the rib 12, and the outer tube 13. Preferably, the length of the rib 12 is smaller than that of the inner tube 11, and when the inner tube 11, the rib 12 and the outer tube 13 are integrally welded, only the end position of the inner tube 11 and the end position of the outer tube 13 are welded together, so that the end of the cannula body 1 forms a matching part 10 where only the inner tube 11 and the outer appearance 13 are welded. This cooperation portion 10 because only the polyurethane material exists, it can be better carry out the butt fusion as an organic whole with sleeve pipe main part 3 for sleeve pipe main part 3 is more smooth with the butt fusion process of intubate main part 1, and the butt fusion effect is better. The length of the fitting portion 10 in this embodiment is 2mm. In another embodiment, in step S1, the cannula body 1 is sleeved on the reducing mandrel 2, and when the cannula body 1 is sleeved on the first shaft portion 21 of the reducing mandrel 2, the matching portion 10 of the cannula body 1 can be sleeved on the reducing shaft portion 22.

Referring to fig. 5 and 6 together, fig. 5 is a schematic structural view illustrating the fit of the middle cannula body, the reducing mandrel and the sleeve body according to the first embodiment, and fig. 6 is a schematic structural view illustrating the fit of the middle cannula body, the reducing mandrel, the sleeve body and the heat-shrinkable sleeve according to the first embodiment. Further, in step S2, the sleeve body 3 is sleeved outside the cannula body 1 and the reducing mandrel 2. Specifically, the inner diameter of the sleeve main body 3 is larger than the outer diameter of the second shaft portion 23. The sleeve main body 3 is sleeved outside the cannula main body 1, the reducing shaft part 22 and the second shaft part 23, and specifically, the sleeve main body 3 is sleeved outside the end part of the cannula main body 1 with the matching part 10, the reducing shaft part 22 and the second shaft part 23.

In step S3, the heat shrinkable sleeve 4 is sleeved outside the sleeve body 3. Specifically, the heat-shrinkable sleeve 4 is in a straight tube shape, the length of the heat-shrinkable sleeve is greater than that of the sleeve body 3, and the inner diameter of the heat-shrinkable sleeve 4 is greater than the outer diameter of the sleeve body 3. Therefore, the heat-shrinkable sleeve 4 can be completely sleeved outside the sleeve main body 3, and the part of the sleeve main body 1 close to the sleeve main body 3 can be sleeved, so that the welding of the sleeve main body 3 and the sleeve main body 1 is comprehensively protected. In this embodiment, the heat shrinkable sleeve 4 is made of one of EVA, FEP, PE, and PTFE, and shrinks inward when heated.

Referring to fig. 7 and 8, fig. 7 is a schematic view illustrating a state where the middle cannula main body and the sleeve main body are welded to each other on the reducing mandrel according to the first embodiment, and fig. 8 is a schematic view illustrating a structure where the middle cannula main body and the sleeve main body are welded to each other according to the first embodiment. Further, in step S4, the heat-shrinkable sleeve 4 is heated, and the heat-shrinkable sleeve 4 is heat-shrunk and coated on the sleeve body 3, so that the sleeve body 3 is adapted to the reducing mandrel 2 for reducing, and the sleeve body 3 is welded to the cannula body 1. Specifically, heat shrink 4 is heated using a heating device, such as a heat gun, to heat shrink 4. 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 sleeve body 3, and the heat shrinkable sleeve 4 sleeved outside the sleeve body 3 is 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 3 and 6 minutes, with a preferred heating time of 4 minutes. In specific application, the heating time can be set according to actual conditions, and if the heating temperature is higher, the heating time is reduced, and vice versa. After heated, the heat-shrinkable sleeve 4 shrinks inwards and wraps the sleeve body 3. Along with the heating, the polyurethane sleeve main body 3 close to the outer side is melted and softened firstly, and begins to deform under the action of the inward shrinkage force of the heat-shrinkable sleeve 4, and because of the action of the inward shrinkage force of the heat-shrinkable sleeve 4, the sleeve main body 3 is inwards coated on the matching part 10, the reducing shaft part 22 and the second shaft part 23 of the insertion tube main body 1, because the matching part 10 is polyurethane which is made of the same material as the sleeve main body 3, the polyurethane is melted at the moment and is finally welded with the sleeve main body 3 into a whole, the reducing shaft part 22 and the second shaft part 23 are made of stainless steel, the reducing shaft part 22 and the second shaft part 23 can be used as a moulding reference of the sleeve main body 3, the part of the sleeve main body 3 close to the insertion tube main body 1 is deformed into a reducing state, and the part of the sleeve main body 3 far away from the insertion tube main body 1 is maintained in a straight tube state. Finally, the sleeve main body 3 is matched with the reducing mandrel 2 for reducing, and the sleeve main body 3 and the intubation main body 1 are welded into a whole. In addition, in the above process, the inward shrinkage force of the heat-shrinkable sleeve 4 is matched with the reducing shaft part 22 to realize the reducing of the sleeve body 3, and meanwhile, the inward shrinkage force of the heat-shrinkable sleeve 4 also promotes the welding process of the sleeve body 3 and the cannula body 1, and in addition, the heating is carried out outside the heat-shrinkable sleeve 4, and the heat-shrinkable sleeve 4 protects the surfaces of the sleeve body 3 and the cannula body 1.

Referring to fig. 1 and 8 again, further, the forming process of the medical reducing cannula in the embodiment further includes the following steps:

and S5, after the heat-shrinkable sleeve 4 is cooled, tearing off the heat-shrinkable sleeve 4 after heat shrinkage. After the sleeve body 3 and the cannula body 1 are welded, the reducing mandrel 2, the welded sleeve body 3 and the cannula body 1 are taken out of the heating device together, and natural cooling or air-blowing cooling is performed. After cooling to room temperature, the heat-shrinkable sleeve 4 is torn off.

And S6, taking down the reducing mandrel 2. The cooled reducing mandrel 2 can be taken out from the sleeve main body 3 and the cannula main body 1 in a welding state, and the rest sleeve main body 3 and the cannula main body 1 in the welding state are the formed medical reducing cannula.

Example two

Referring to fig. 9, fig. 9 is a schematic structural view of an inner tube, an outer tube, a reinforcing rib, a reducing mandrel, a sleeve body, and a heat-shrinkable sleeve according to a second embodiment, and fig. 10 is a schematic structural view of the inner tube, the reinforcing rib, and the outer tube sequentially fitted to the reducing mandrel according to the second embodiment. The difference between the forming process of the medical reducing cannula in the embodiment and the first embodiment is that:

in step S1, the step of sleeving the cannula body 1 on the reducing mandrel 2 includes the steps of:

s11, the inner tube 11 is sleeved outside the first shaft portion 21, the diameter-variable shaft portion 22, and the second shaft portion 23.

S12, sleeving the reinforcing ribs 12 outside the inner pipe 11.

And S13, sleeving the outer pipe 13 outside the reinforcing rib 12.

It can be understood that, in the first embodiment, after the sleeve main body 3 and the matching portion 10 of the cannula main body 1 are welded, a welding transition structure exists between the sleeve main body and the cannula main body, which causes the inner wall of the finally formed medical reducing cannula to also exist, and the welding transition structure affects the fluency of blood circulation in the medical reducing cannula. And embodiment two, directly the cover is established outside first axial region 21, reducing axial region 22 and second axial region 23 with injection moulding or extrusion moulding's inner tube 11, and then cooperate the shaping with strengthening rib 12 and outer tube 13 to be intubate main part 1, so, when follow-up and 3 butt fusion of sleeve pipe main part, only the outer wall of inner tube 11 and 3 butt fusion of sleeve pipe main part, the inner wall of medical reducing intubate is exactly the inner wall of inner tube 11, do not have butt fusion transition structure, the smoothness of the inner wall of medical reducing intubate has been guaranteed, and then the smoothness nature of blood circulation in the medical reducing intubate has been promoted.

In step S11, the inner tube 11 may be formed by one-time injection molding or extrusion molding of polyurethane, and the formed inner tube 11 may be expanded by deformation. The inner diameter of the inner tube 11 is adapted to the outer diameter of the first shaft portion 21, and after the inner tube 11 is sequentially sleeved on the first shaft portion 21, the diameter-variable shaft portion 22, and the second shaft portion 23, the inner diameter of the inner tube 11 sleeved on the diameter-variable shaft portion 22 and the second shaft portion 23 is expanded, and the thickness is reduced accordingly. Preferably, before step S11, step S10 is further included, in which a preset portion of the inner tube 11 is thickened. In the embodiment, the preset portion, that is, the portion of the inner tube 11 to be subjected to the inner diameter expansion by the reducing shaft portion 22 and the second shaft portion 23, when the application is specific, the thickness of the preset portion can be increased by welding a thin-walled tube made of polyurethane on the outer wall of the preset portion of the inner tube 11, so as to compensate for the wall of the preset portion of the inner tube 11, which is sleeved on the reducing shaft portion 22 and the second shaft portion 23 and becomes thinner due to the inner diameter expansion.

In step S12, the reinforcing ribs 12 are fitted around the inner tube 11. The reinforcing rib 12 can be sleeved on the inner tube 11 at a position corresponding to the first shaft 21. Preferably, in the present embodiment, the reinforcing ribs 12 are disposed at positions of the inner tube 11 corresponding to the first shaft portion 21 and the variable diameter shaft portion 22. The reinforcing rib 12 is sleeved on the position of the inner tube 11 corresponding to the reducing shaft part 22, so that the reducing structure of the cannula main body 1 and the finally formed medical reducing cannula is reinforced. In specific applications, the reinforcing ribs 12 may directly wind around the portions of the inner tube 11 corresponding to the first shaft portion 21 and the reducing shaft portion 22, or the reinforcing ribs 12 may be prepared to have a matching reducing structure and then sleeved on the portions of the inner tube 11 corresponding to the first shaft portion 21 and the reducing shaft portion 22, or the reinforcing ribs 12 may be directly sleeved on the portions of the inner tube 11 corresponding to the first shaft portion 21 and the reducing shaft portion 22, but the portions of the inner tube 11 corresponding to the reducing shaft portion 22 sleeved with the reinforcing ribs 12 may become sparse.

In step S13, the outer tube 13 is fitted over the portion of the rib 12 corresponding to the first shaft portion 21. It can be understood that after the reinforcing rib 12 is sleeved on the portion of the inner tube 11 corresponding to the first shaft portion 21, the outer tube 13 is sleeved on the portion of the reinforcing rib 12 corresponding to the variable diameter shaft portion 22 with great difficulty, and at this time, only the outer tube 13 is sleeved on the portion of the reinforcing rib 12 corresponding to the first shaft portion 21, so that the production process is smoothly performed.

Referring to fig. 11 and 14 together, fig. 11 is a schematic structural diagram of the second embodiment in which the inner tube, the outer tube, the reinforcing ribs, the reducing mandrel and the sleeve body are matched, fig. 12 is a schematic structural diagram of the second embodiment in which the inner tube, the outer tube, the reinforcing ribs, the reducing mandrel, the sleeve body and the heat-shrinkable sleeve are matched, fig. 13 is a schematic structural diagram of the second embodiment in which the intermediate tube body and the sleeve body are welded on the reducing mandrel, and fig. 14 is a schematic structural diagram of the second embodiment in which the intermediate tube body and the sleeve body are welded. Further, in step S2, the sleeve main body 3 is fitted over the inner tube 11, the bead 12, and the outer tube 13. Specifically, the sleeve main body 3 is fitted over the end portions of the inner tube 11, the reinforcing ribs 12, and the outer tube 13 close to the reinforcing ribs 12. In step S3, the heat shrinkable tube 4 is fitted over the tube body 3 and the outer tube 13. Specifically, the heat-shrinkable tube 4 is sleeved outside the tube body 3 and the outer appearance 13, and fully covers the tube body 3 and the outer tube 13. In the welding in step S4, the heating is performed to heat the sleeve body 3 and the heat shrinkable sleeve 4 outside the outer tube 13. Therefore, the heat-shrinkable sleeve 4 is shrunk by heating and is wrapped outside the sleeve main body 3 and the outer tube 13, and the overall protection of the outer surfaces of the sleeve main body 3 and the outer tube 13 is realized. As the heating progresses, the inner wall of the outer tube 13 and the outer wall of the inner tube 11 fuse the linear portions of the lower portions of the ribs 12, and the sleeve body 3 is deformed to fit the first shaft portion 21, the variable diameter shaft portion 22, and the second shaft portion 23 by the internal contraction force of the heat-shrinkable sleeve 4, then fuses with the outer wall of the inner tube 11, and fuses the variable diameter portions of the upper portions of the ribs 12. Steps S5 and S6 are the same as steps S5 and S6 of the first embodiment, and are not described again here. Finally, the formed medical variable-diameter cannula has smooth inner wall, no welding transition structure and good blood circulation fluency.

In conclusion, the sleeve main body replaces the reducer union with the reducer structure to participate in the forming of the reducer insertion pipe, the forming of the sleeve main body is simpler than that of the reducer union, the forming yield of the sleeve main body is high, and the forming cost is lower. And the intubation main body and the sleeve main body are of an integrated structure in a welded state, the produced variable-diameter intubation has no gap, the blood condition cannot be damaged after the arteriovenous intubation is used for a long time, and the pressure drop level of the intubation is ensured. In addition, the finally formed medical variable-diameter cannula has smooth inner wall, no welding transition structure and good blood circulation fluency.

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 or the like 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:

sleeving the cannula main body on the reducing mandrel; the reducing mandrel comprises a first shaft part, a reducing shaft part and a second shaft part which are integrally formed, and the intubation tube main body comprises an inner tube, a reinforcing rib and an outer tube; the method for sleeving the cannula main body on the reducing mandrel comprises the following steps: sleeving the inner pipe outside the first shaft part, the variable-diameter shaft part and the second shaft part; the reinforcing rib is sleeved outside the inner pipe; the outer pipe is sleeved outside the reinforcing rib;

sleeving a sleeve main body outside the cannula main body and the reducing mandrel; the sleeve main body is in a regular straight tube shape; the cannula body is sleeved on the first shaft part, and the cannula body, the reducing shaft part and the second shaft part are sleeved with the cannula body;

sleeving a heat-shrinkable sleeve outside the sleeve main body;

and heating the heat-shrinkable sleeve, wherein the heat-shrinkable sleeve is heated and coated on the sleeve main body, so that the sleeve main body is matched with the reducing mandrel to reduce the diameter, and the sleeve main body is welded with the insertion pipe main body.

2. The forming process of the medical reducing cannula according to claim 1, wherein the reinforcing rib is sleeved on the inner tube at a position corresponding to the first shaft part and the reducing shaft part.

3. The forming process of the medical reducing insertion pipe according to claim 2, wherein the outer tube is sleeved on the portion of the reinforcing rib corresponding to the first shaft portion.

4. The process for forming the medical reducing cannula according to claim 3, wherein the main sleeve body is sleeved outside the inner tube, the reinforcing ribs and the outer tube.

5. The process for forming the medical reducing cannula according to claim 4, wherein the heat-shrinkable sleeve is sleeved outside the sleeve body and the outer tube.

6. The forming process of the medical reducing cannula according to any one of claims 1 to 5, further comprising the following steps:

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

and taking down the reducing mandrel.

7. An intubation tube formed by the forming process of the medical reducing intubation tube according to any one of claims 1 to 6.

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