CN111497079B

CN111497079B - Spiral balloon forming die

Info

Publication number: CN111497079B
Application number: CN202010316860.1A
Authority: CN
Inventors: 张晨朝; 王越; 王君毅; 时玉楠; 王国辉
Original assignee: Weiming Medical Equipment Shanghai Co ltd
Current assignee: Weiming Medical Equipment Shanghai Co ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2022-05-31
Anticipated expiration: 2040-04-21
Also published as: CN111497079A

Abstract

The invention discloses a spiral balloon forming die, which relates to the technical field of balloon forming and comprises a core body and a heating sleeve, wherein the outer surface of the core body comprises a first convex body, and the inner surface of the heating sleeve comprises a first concave body; the shape of the first convex body matches the shape of the first concave body. The invention reduces the uneven size of the gap between the core body and the heating sleeve, increases the contact area of the core body and the heating sleeve, has more stable balloon forming process, improves the heating efficiency and the assembling efficiency, and reduces the production cost and the control requirement.

Description

Spiral balloon forming die

Technical Field

The invention relates to the technical field of balloon forming molds, in particular to a spiral balloon forming mold.

Background

The balloon dilatation catheter is a key medical instrument for interventional therapy and is widely applied to the field of intracavity interventional therapy. The balloon dilatation catheter not only can pre-dilate and shape the blood vessel, but also can convey the stent and precisely shape the stent. Wherein the balloon is used as an expansion and shaping tool.

The balloon is shaped by a balloon shaping device. The balloon forming die for angioplasty is mostly composed of a heating sleeve and a core body. Fig. 1 is a most commonly used balloon forming mold at present, fig. 2 is a structural schematic diagram of a heating jacket of the balloon forming mold shown in fig. 1, and fig. 3 is a structural schematic diagram of a core of the balloon forming mold shown in fig. 1; wherein, the core body 2 is a cylindrical structure, and a balloon forming hole 4 is arranged in the middle; the heating sleeve 1 is hollow and cylindrical, and is provided with a plurality of heating holes 3 for the heating guide wire to pass through so as to achieve the purpose of heating the core body 2; the core body 2 and the heating sleeve 1 are in interference fit.

However, the size of the gap between the heating jacket and the core is difficult to maintain uniform due to the existing processing technology and processing precision. When the gap is too large, the heat transfer is slow and the heating is uneven; when the gap is too small, the interference fit is easy to cause inconvenience, and the thermal expansion also possibly causes damage to the die, so that the service life of the die is shortened, and the cost is increased.

Therefore, those skilled in the art have devoted themselves to develop a spiral balloon forming mold that optimizes the gap distribution between the heating sheath and the core and is easy to assemble.

Disclosure of Invention

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to optimize the distribution of the gap between the heating jacket and the core, and to facilitate the assembly.

In order to achieve the above object, the present invention provides a spiral balloon forming mold, comprising a core body and a heating jacket, wherein the outer surface of the core body comprises a first convex body, and the inner surface of the heating jacket comprises a first concave body; the shape of the first convex body matches the shape of the first concave body.

Further, the shape matching mode of the first convex body and the first concave body comprises thread shape matching and gear shape matching.

Further, the first male body has an outer helical structure and the first female body has an inner helical structure.

Further, the outer helical structure, the inner helical structure, the core and the heating jacket are coaxial.

Further, the outer spiral structure material selection comprises a metal material.

Further, the material selection of the inner spiral structure comprises a metal material.

Further, the first concave body comprises a heating hole, and the heating hole is in the same spiral direction as the first concave body.

Further, the cross-sectional shape of the heating hole is circular.

Further, the outer surface of the heating jacket is cylindrical.

Further, the heating jacket can be split into two semicylinders.

Further, the heating jacket can be detached along the heating hole direction of the heating jacket.

Further, at least one of the first male body and the first female body is provided with a thermal sensor along the axial direction of the core body.

Further, the material of the heating wire of the heating hole of the heating jacket comprises a copper wire.

Compared with the prior art, the invention has the following beneficial effects:

(1) the core body and the heating sleeve are connected through the threads, so that the contact area is large, the heating temperature is increased more quickly, and the probability of untight fit between the heating sleeve and the core body is reduced;

(2) the heating holes are designed in a spiral shape with the same spiral direction as the internal spiral structure of the heating sleeve, so that the heating guide wires can be more uniformly distributed in the heating sleeve body, and the temperature rise of the core body is more uniform;

(3) the threaded connection of heating jacket and core, the structure is reliable, and the assembly degree of difficulty is low, is favorable to extension mould life and improvement production efficiency.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic structural diagram of a prior art balloon forming mold;

FIG. 2 is a schematic view of a heating jacket structure of the balloon forming mold shown in FIG. 1;

FIG. 3 is a schematic diagram of a core structure of the balloon forming mold shown in FIG. 1;

FIG. 4 is a cross-sectional view of a helical balloon forming mold according to one embodiment of the invention;

FIG. 5 is a side view of a heating jacket of a spiral balloon molding die of one embodiment of the present invention;

FIG. 6 is a cross-sectional view of the heating jacket of FIG. 5;

FIG. 7 is a side view of the core of the spiral balloon molding die of one embodiment of the present invention;

fig. 8 is a cross-sectional view of the core shown in fig. 7.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of technical contents. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

Fig. 4 shows a spiral balloon forming mold according to an embodiment of the present invention, which includes a core 2 and a heating jacket 1, wherein an outer surface of the core 2 has an outer spiral structure 5, and an inner surface of the heating jacket 1 has an inner spiral structure 6; the pitch and diameter of the outer helical structure 5 and the inner helical structure 6 match. The outer spiral structure 5 is connected with the inner spiral structure 6 in a thread-like manner, so that the core body 2 and the heating jacket 1 are prevented from being in interference fit, the probability of untight fit between the heating jacket 1 and the core body 2 is reduced, and the problem of damage after the core body 2 is heated and expanded when a gap is too small is solved; in addition, the connection mode of the spiral structure increases the contact area between the core body 2 and the heating sleeve 1, so that the heating efficiency of the core body 2 is higher and the heating is more uniform; in addition, the spiral structure is screwed in and out, so that the assembly mode of the core body 2 and the heating sleeve 1 is simpler, and the spiral balloon forming die is favorable for clamping.

In order to improve the tightness of the thread pairs of the outer spiral structure 5 and the inner spiral structure 6, the cross-sectional shapes of the threads of the outer spiral structure 5 and the inner spiral structure 6 are selected to be triangular. Optionally, the thread cross-sectional shapes of the outer spiral structure 5 and the inner spiral structure 6 further include one or a combination of the following shapes: trapezoidal, rectangular, square, and circular arc.

In some embodiments, the surface cross-sections of the core 2 and the heating jacket 1 may also be shaped like gear tooth grooves. That is, the outer surface of the core 2 has teeth protruding in the axial direction, and the inner surface of the heating jacket 1 has tooth grooves matching the teeth in the axial direction.

Fig. 5 and 6 are a side view and a sectional view of the heating jacket 1, respectively.

Fig. 7 and 8 are a side view and a sectional view, respectively, of the core 2.

In order to further improve the heating uniformity of the heating jacket 1, the internal spiral structure 6 is optionally provided with heating holes 3 in the same spiral direction as the internal spiral structure. Compared with the axial heating hole 3 shown in fig. 3, the heating hole 3 is the same as the inner spiral structure 6 in spiral, the effective length of the heating guide wire in the die is increased, and the heating guide wire is uniformly distributed along the circumferential direction of the cross section of the balloon forming hole 4, so that the balloon material is heated more uniformly in the forming process. Further optionally, the heating holes 3 are disposed in the inner spiral structure 6 at the high entities above the two sides of the groove, as shown in the position of the heating holes 3 shown in fig. 6, so that the heat source is closer to the balloon forming hole 4. Still further alternatively, the inner helical structure 6 and the outer helical structure 5 are selected from metallic materials to improve heating efficiency.

In order to further facilitate the installation of the heating guide wire, the section of the heating hole 3 is selected to be circular. Optionally, the cross-sectional shape of the heating hole 3 further includes one or a combination of the following shapes: oval and rectangular.

In some embodiments, the heating jacket 1 is provided in a detachable manner in order to improve the efficiency of installation of the heating wire in the heating hole 3. For example, for a spiral-shaped heating hole 3, the heating jacket 1 can be divided into two parts along the plane of the central axis, each part being seen in the plane of the connection as shown in fig. 6. With such an arrangement, the heating jacket 1 having a long axial length is advantageous for adjusting the heating guide wire which is difficult to thread.

In some embodiments, the heating jacket 1, the core 2, the heating hole 3, the outer spiral structure 5 and the inner spiral structure 6 are arranged in a coaxial structure, so as to reduce the radial dimension of each structure, which is beneficial to improving the heat transfer efficiency and ensuring that the heat transfer is more uniform.

In some embodiments, at least one of the outer helical structure 5 and the inner helical structure 6, with a thermal sensor disposed axially; the thermal sensor obtains an amount of temperature at a location. The thermal sensor monitors the real-time temperature of the length direction of the balloon forming hole 4, and can be used as the control basis of the current amplitude or the duration of the heating guide wire.

In some embodiments, the specific process of the invention applied to the balloon molding manufacture comprises the following steps:

step 1, screwing a core body 2 of a balloon forming die into a heating sleeve 1 according to spiral stripes;

step 2, a sacculus pipe is inserted into a sacculus forming hole 4 of a core body 2, two ends of the core body 2 are matched with a sacculus forming end die, and a heating guide wire is inserted into a heating hole 3 of a heating sleeve 1;

step 3, heating the balloon forming die, and pressurizing and stretching the balloon pipe at the same time to enable the balloon wall to be tightly attached to the inner wall of the balloon forming hole 4;

and 4, after the forming is finished, cooling the balloon forming die, and taking out the balloon after the forming is finished.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concept. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. The spiral balloon forming die is characterized by comprising a core body and a heating sleeve, wherein the outer surface of the core body comprises a first convex body, and the inner surface of the heating sleeve comprises a first concave body; the shape of the first convex body is matched with the shape of the first concave body; the shape matching mode of the first convex body and the first concave body comprises thread shape matching and gear shape matching; the first concave body comprises a heating hole, and the heating hole and the first concave body are in the same spiral direction.

2. The helical balloon molding die of claim 1 wherein said first male body has an outer helical configuration and said first female body has an inner helical configuration.

3. A spiral balloon molding die as claimed in claim 2 wherein the outer spiral structure, the inner spiral structure, the core and the heating jacket are coaxial.

4. A helical balloon forming mold as claimed in claim 3 wherein the outer helical structural material is selected to comprise a metallic material.

5. The helical balloon molding die of claim 3 wherein the internal helical structural material selection comprises a metallic material.

6. The helical balloon molding die of claim 1 wherein the heating jacket outer surface is cylindrical.

7. The spiral balloon molding die of claim 1, wherein the heating jacket is detachable in a heating hole direction of the heating jacket.

8. The helical balloon molding die of claim 1 wherein at least one of said first convex body and said first concave body is provided with a thermal sensor axially along said core.

9. The spiral balloon forming mold according to claim 1, wherein the material of the heating wire of the heating hole of the heating sheath comprises copper wire.