Dipping mold of forked covered stent

Abstract

The utility model relates to the technical field of medical instruments for interventional therapy, in particular to a dipping mold for a forked covered stent. Comprising a main rod body and a connecting rod arranged at the upper end of the main rod body, an auxiliary rod body is fixedly connected to one side of the main rod body, the main rod body and the auxiliary rod body are each of a cylindrical structure, the upper end of the auxiliary rod body is fixedly connected to the side wall of the main rod body at an acute included angle, and the upper end of the main rod body is provided with a mounting datum plane; and the connecting rod is fixedly mounted on the mounting datum plane and is perpendicular to the mounting datum plane. The impregnating mold is used for impregnating and laminating a forked stent, the film thickness is uniform and good in consistency, the mold is arranged in order, the density is high, and the production efficiency of the impregnating procedure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of interventional therapy medical instrument, concretely relates to a kind of dipping mould of bifurcated type covered stent. BACKGROUND

[0002] Vascular stent is usually placed into inner stent in the blood vessel of pathological segment on the basis of lumen balloon dilatation shaping to achieve the purpose of supporting the blood vessel of narrow occlusion segment, reducing vascular elastic retraction and reshaping, keeping lumen blood flow unobstructed. Vascular stent body is usually woven into round pipe shape mesh structure by metal tantalum wire, medical stainless steel wire and nickel-titanium alloy wire. According to the need of treatment, thin film can be covered on the inner and outer surfaces of stent body to form covered stent. Covered stent is usually used in vascular intervention, structural heart disease, respiration and other fields, and covered film material has enough biocompatibility. Commonly used covered film materials include PTFE (polytetrafluoroethylene), PU (polyurethane), organic silicone polymer and PET (polyester), and the covered film method includes dipping process, spraying process and laminating process. In the dipping process, the framework woven by metal wire is installed on the dipping mould, put into dipping bin, so that the dipping liquid in the dipping bin infiltrates the framework and the outer surface of the dipping mould, then the dipping mould is taken out from the dipping bin and dried, so that the framework woven by metal wire forms thin film and becomes covered stent. In addition, in order to improve the efficiency of covering, multiple moulds are usually installed on the same mould support for dipping and drying, and the arrangement density between the dipping moulds is very large. As a variant of straight-line vascular stent, bifurcated vascular stent is usually used in vascular bifurcated lesion site. For example, Chinese patent 2011100390530 discloses "branch type aortic stent vascular system", and the authorization announcement number is CN102641164B. The stent includes one aortic stent vessel and three branch aortic stent vessels. The middle segment of the aortic stent vessel is provided with a recess, and the recess is provided with three side holes. The three branch aortic stent vessels are separately arranged in the three side holes. The branch type aortic stent vascular system can isolate aortic lesions involving aortic arch and ascending aorta, reconstruct the blood flow of branch aorta, avoid customizing stent, and can be mass-produced and used for emergency surgery. However, the shape of this stent is asymmetric, occupies a large space when installed on the mould support, the density of the moulds on the same mould support is small, and the improvement of production efficiency is affected. In addition, the mould is usually installed vertically on the bottom of the mould support with the axis of the aortic stent as the reference during the dipping of the covered film. However, since the branch aortic stent extends outward from one side of the aortic stent, the branch aortic stent will be inclined at a certain angle when the aortic stent is vertical. The thickness of the thin film formed on the upper and lower sides of the branch aortic stent by the dipping liquid is not uniform. The greater the inclination angle, the greater the difference in the thickness of the thin film. SUMMARY

[0003] The utility model provides a kind of dip mould of bifurcated type film-coated stent with good uniformity of film thickness, it is convenient to install dip mould on mould support in order and high density, improve the production efficiency of dip process.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] The utility model discloses a kind of dip mould of bifurcated type film-coated stent including main stick body and the connecting rod being set in the upper end of main stick body, the side of the main stick body is fixedly connected with auxiliary stick body, the main stick body and auxiliary stick body are all cylindrical structure, the upper end of auxiliary stick body is fixedly connected on the side wall of main stick body with acute angle included angle, the upper end of main stick body has installation datum plane, the connecting rod is fixedly installed on the installation datum plane and with installation datum plane vertical.

[0006] By the scheme, dip film-coated stent can be installed on mould frame.

[0007] Preferably, the center line of the included angle of the main stick body and the auxiliary stick body is perpendicular to the installation datum plane.

[0008] By the scheme, when dip mould is installed on mould frame, the inclination angle of main stick body and auxiliary stick body is as small as possible, which is conducive to forming dip film layer with uniform thickness.

[0009] Preferably, the lower end of the main stick body and the auxiliary stick body is provided with a semispherical ball head.

[0010] By the scheme, the lower end of stick body is uniformly rounded, which is conducive to uniform distribution of dip liquid.

[0011] Preferably, the upper end of the connecting rod is provided with external threads.

[0012] By the scheme, the connecting rod can be conveniently installed on mould frame.

[0013] Preferably, the upper end of the auxiliary stick body is provided with an insert matched with the installation hole, and the insert is installed in the installation hole in interference fit.

[0014] By the scheme, the connection and disassembly of the main stick body and the auxiliary stick body are facilitated.

[0015] The utility model has the advantages that the dip mould is used for dip film-coated stent, film thickness is uniform and consistent, mould is arranged in order and has high density, which is conducive to improving the production efficiency of dip process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic view of an embodiment of the utility model.

[0017] Figure 2 For Figure 1 A cross-sectional structural schematic diagram of the embodiment. DETAILED DESCRIPTION

[0018] The other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the present specification without departing from the spirit of the present application.

[0019] As Figure 1 , Figure 2 shown, the immersion mold of the bifurcated type covered stent includes a main rod body 1 and a connecting rod 2 arranged at the upper end of the main rod body 1. One side of the main rod body 1 is fixedly connected with a secondary rod body 3. The main rod body 1 and the secondary rod body 3 are both cylindrical structures with smooth and corrosion-resistant surfaces, which are made of stainless steel, aluminum alloy or other materials. The lower ends of the main rod body 1 and the secondary rod body 3 are both provided with hemispherical heads with diameters equal to the diameters of the rod bodies, so that the lower ends of the main rod body 1 and the secondary rod body 3 form smooth transition surfaces. The upper end of the secondary rod body 3 is fixedly connected to the side wall of the main rod body 1 at an acute angle. The upper end of the main rod body 1 is provided with a mounting reference surface 4. The connecting rod 2 is fixedly mounted on the mounting reference surface 4 and perpendicular to the mounting reference surface 4. The center line A of the included angle between the main rod body 1 and the secondary rod body 3 is perpendicular to the mounting reference surface 4. When the upper end of the main rod body 1 is mounted on the mold support, the mounting reference surface 4 abuts against the lower surface of the mold support, so that the connecting rod 2 remains perpendicular to the lower surface of the mold support. The main rod body 1 and the secondary rod body 3 are respectively offset by a certain angle to the two sides of the center line A, so that the angles of inclination of the main rod body 1 and the secondary rod body 3 are both minimized, and the film thickness formed by the immersion liquid on the main rod body 1 and the secondary rod body 3 is consistent. Meanwhile, arranging multiple molds on the mold support at the same angle can improve the arrangement density, and as many molds as possible are mounted on the same mold support, thereby improving the efficiency of the immersion film forming process.

[0020] In addition, as a further improvement of the present application, the upper end of the connecting rod 2 is provided with external threads, by which the connecting rod 2 can be mounted into the mounting hole of the mold support.

[0021] The side wall of the main rod body 1 is provided with a mounting hole, the upper end of the auxiliary rod body 3 is provided with an insert 31 matched with the mounting hole, and the insert 31 is mounted in the mounting hole. The mounting hole can be a round hole, a square hole, or a regular pentagonal hole or a regular hexagonal hole; correspondingly, the insert 31 is a columnar structure, and the cross section of the insert 31 can be circular, rectangular, or regular pentagonal or regular hexagonal. In addition, the upper end surface of the auxiliary rod body 3 is an arc surface matched with the concave inner wall of the side wall of the main rod body 1, so that after the insert 31 is inserted into the mounting hole, the upper end surface of the auxiliary rod body 3 can be tightly attached to the side wall of the main rod body 1. In addition, in order to facilitate the cooperation of the insert 31 and the mounting hole, a wear-resistant plastic layer can also be arranged on the inner wall of the mounting hole.

[0022] In use, the main rod body 1 and the auxiliary rod body 3 are separated, the aortic stent is sleeved on the main rod body 1, and the side holes on the aortic stent are aligned with the mounting holes on the main rod body 1, that is, the mounting positions of the auxiliary rod body 3, in addition, the branch aortic stent is sleeved on the auxiliary rod body 3, and the inner end of the branch aortic stent is slightly away from the upper end surface of the auxiliary rod body 3, then the auxiliary rod body 3 is mounted into the mounting hole of the main rod body 1, and the assembled mold is mounted on the mold support and then placed into the dipping bin for dipping and coating. After the dipping and coating is completed, the drying process is performed, and after the dipping is completely dried to form a film, the mold is removed, and the stent after coating is taken off from the mold.

[0023] The contents not described in detail in the specification belong to the prior art known by the person skilled in the art. Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A dipping mold for a bifurcated type covered stent, comprising a main rod body (1) and a connecting rod (2) arranged at the upper end of the main rod body (1), characterized in that, One side of the main rod body (1) is fixedly connected with a secondary rod body (3), the main rod body (1) and the secondary rod body (3) are both cylindrical structures, the upper end of the secondary rod body (3) is fixedly connected on the side wall of the main rod body (1) with an acute angle, the upper end of the main rod body (1) is provided with a mounting reference surface (4), the connecting rod (2) is fixedly mounted on the mounting reference surface (4) and is perpendicular to the mounting reference surface (4).

2. The dipping mold for bifurcated type covered stent according to claim 1, wherein The center line (A) of the included angle between the main rod body (1) and the secondary rod body (3) is perpendicular to the mounting reference surface (4).

3. The dipping mold for bifurcated type covered stent according to claim 1 or 2, wherein The lower end of the main rod body (1) and the secondary rod body (3) are both provided with a hemispherical ball head.

4. The dipping mold for a bifurcated type of a covered stent according to claim 1 or 2, wherein The upper end of the connecting rod (2) is provided with external threads.

5. The dipping mold for bifurcated type covered stent according to claim 1 or 2, wherein The side wall of the main rod body (1) is provided with a mounting hole, the upper end of the secondary rod body (3) is provided with an insert (31) matched with the mounting hole, and the insert (31) is mounted in the mounting hole in interference fit.

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