阅读说明：本技术 一种NiTi合金血管支架热定型用工装夹具 (Fixture for heat setting of NiTi alloy intravascular stent ) 是由 冯海全 马双全 李长胜 冯浩翔 白丽平 于 2021-07-02 设计创作，主要内容包括：本发明提供一种NiTi合金血管支架热定型用工装夹具,固定板位于底座上方；旋转轴的下端轴颈放置于底座的中心处,上端轴颈卡在固定板的U形槽内,旋转轴的上端与手柄相连接,旋转轴的中间部位纵向设有若干个不等高弧形实体,不等高弧形实体的外轮廓面径向逐渐的外扩,每个不等高弧形实体外套有一个扩张活动件,扩张活动件外侧套有NiTi合金支架；扩张活动件沿着不等高弧形实体的外轮廓面滑动,使得扩张活动件外围所在的圆柱面直径逐渐变大,并对NiTi合金支架实现扩张。本发明采用旋转轴旋转的方式扩张支架,能够实现支架的均匀扩张及热定型,提升扩张效率及精度。装卸时,只需反向旋出旋转轴即可取出,操作简单快捷,实用性强。(The invention provides a frock clamp for heat setting of a NiTi alloy intravascular stent, wherein a fixed plate is positioned above a base; the lower end journal of the rotating shaft is placed in the center of the base, the upper end journal is clamped in the U-shaped groove of the fixing plate, the upper end of the rotating shaft is connected with the handle, a plurality of unequal-height arc-shaped entities are longitudinally arranged in the middle of the rotating shaft, the outer contour surface of each unequal-height arc-shaped entity is radially and gradually expanded outwards, an expansion moving part is sleeved outside each unequal-height arc-shaped entity, and a NiTi alloy support is sleeved outside each expansion moving part; the expansion moving part slides along the outer contour surface of the unequal-height arc-shaped entity, so that the diameter of the cylindrical surface where the periphery of the expansion moving part is located is gradually increased, and the NiTi alloy support is expanded. The invention adopts the rotating shaft to expand the stent, can realize the uniform expansion and heat setting of the stent, and improves the expansion efficiency and precision. When the rotary shaft is assembled and disassembled, the rotary shaft can be taken out only by reversely screwing out the rotary shaft, the operation is simple and rapid, and the practicability is high.)

1. A NiTi alloy frock clamp for the heat setting of a vascular stent is characterized by comprising a frame and an expansion mechanism;

the rack comprises a base (1), a connecting rod (2) and a fixing plate (3); the fixing plate (3) is positioned above the base (1), and the fixing plate (3) is fixedly connected with the base (1) through a connecting rod (2);

the expansion mechanism comprises a handle (4), a rotating shaft (5) and an expansion moving part;

the lower end journal of the rotating shaft (5) is placed in the center of the base (1), the upper end journal is clamped in a U-shaped groove of the fixing plate (3), the upper end of the rotating shaft (5) is connected with the handle (4), a plurality of unequal-height arc-shaped entities (51) are longitudinally arranged in the middle of the rotating shaft (5), the outer contour surface of each unequal-height arc-shaped entity (51) is radially and gradually expanded outwards, an expansion moving part is sleeved outside each unequal-height arc-shaped entity (51), and a NiTi alloy support (7) is sleeved outside each expansion moving part; the expansion moving piece slides along the outer contour surface of the unequal-height arc-shaped entity (51), so that the diameter of the cylindrical surface where the periphery of the expansion moving piece is located is gradually increased, and the expansion of the NiTi alloy bracket (7) is realized.

2. A tooling clamp for heat setting of a NiTi alloy vascular stent as claimed in claim 1, wherein the expansion moving parts are a plurality of expansion sliding blocks (6), the inner contour of the expansion sliding block (6) is the same as the outer contour curve of the unequal-height arc-shaped solid (51) and is in sliding contact with the outer contour curve; the outer contour of the expansion sliding block (6) is in contact with the inner wall of the NiTi alloy bracket (7).

3. A tooling clamp for heat setting of a NiTi alloy stent as claimed in claim 2, wherein when the plurality of expanding sliders (6) are folded, the outer contour forms a cylindrical surface, and the diameter of the cylindrical surface is smaller than the inner diameter of the NiTi alloy stent (7).

4. The tooling fixture for heat setting of the NiTi alloy vascular stent as claimed in claim 1, wherein the expansion moving part comprises an expansion plate (61), a sliding groove (62) and a lining plate (8), the inner end edge of the expansion plate (61) is in sliding contact with the outer contour of the unequal-height arc-shaped solid (51), the lining plate (8) is movably connected to the outer end edge of the expansion plate (61), the middle part of the expansion plate (61) penetrates through the sliding groove (62), when the expansion plate (61) slides along with the outer contour of the unequal-height arc-shaped solid (51), the expansion plate (61) radially moves in the sliding groove (62), the expansion plate (61) radially moves to drive the lining plate (8) to radially expand, and the expansion of the NiTi alloy stent (7) is realized.

5. A tool clamp for heat setting of a NiTi alloy stent holder according to claim 4, wherein a plurality of lining plates (8) are folded to be positioned on the same hollow cylindrical surface, and the diameter of the hollow cylindrical surface is smaller than the inner diameter of the NiTi alloy stent holder (7).

6. A tool clamp for heat setting of a NiTi alloy blood vessel stent according to any one of claims 1 to 5, wherein the unequal height arc-shaped solid bodies (51) have one or more of an involute curve, a parabolic curve, a sinusoidal curve or an exponential curve.

7. A tool clamp for heat setting of a NiTi alloy blood vessel stent according to any one of claims 1 to 5, wherein the number of the unequal-height arc-shaped solid bodies (51) is 3-8.

Technical Field

The invention relates to the technical field of interventional medical instruments, in particular to a tool clamp for heat setting of a NiTi alloy intravascular stent.

Background

In recent years, the number of deaths caused by cardiovascular diseases is increased year by year, the mortality rate is higher than that of tumors and other diseases, the deaths are the first in China and become healthy first killers, and at present, intracavity stent implantation is the most common method for treating cardiovascular and cerebrovascular diseases. The metal stent takes biomedical metal or alloy as a raw material, wherein the NiTi alloy has the characteristics of good shape memory effect, superelasticity, lower magnetization coefficient and small influence on magnetic resonance imaging. It is often used to treat stenotic lesions such as intracranial artery, carotid artery, thoracic and abdominal aorta, lower extremity artery, etc.

In order to save cost, the NiTi alloy metal intravascular stent generally adopts thinner tubing to carry out laser cutting treatment, and then undergoes expansion and heat treatment for several times so as to reach the required size. When the NiTi alloy metal blood vessel stent is expanded, the plastic deformation of martensite and austenite can be realized only by depending on the temperature change due to the memory property of the NiTi alloy metal blood vessel stent. At present, a cylinder with one conical end is inserted into a metal intravascular stent for expansion in production, and in the insertion process, because the NiTi alloy intravascular stent has higher rigidity, the friction force between the cylinder and the wall of the metal intravascular stent is also higher, the propulsion is hard, and the cylinder is not easy to enter. In addition, for some NiTi alloy intravascular stents with thin diameters, the cylinders which are correspondingly expanded are also thin, in the insertion process, the uniform stress cannot be guaranteed when hands exert force, so that the cylinders are easy to deform and bend, the machining efficiency is low, and the common machine tool fixture cannot meet the requirements.

Disclosure of Invention

The invention aims to provide a tool clamp for heat setting of a NiTi alloy intravascular stent, which solves the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a NiTi alloy frock clamp for the heat setting of a vascular stent comprises a frame and an expansion mechanism;

the rack comprises a base, a connecting rod and a fixing plate; the fixed plate is positioned above the base, and the fixed plate and the base are fixedly connected through a connecting rod;

the expansion mechanism comprises a handle, a rotating shaft and an expansion moving part;

the lower end journal of the rotating shaft is placed in the center of the base, the upper end journal is clamped in the U-shaped groove of the fixing plate, the upper end of the rotating shaft is connected with the handle, a plurality of unequal-height arc-shaped entities are longitudinally arranged in the middle of the rotating shaft, the outer contour surfaces of the unequal-height arc-shaped entities are gradually and radially expanded outwards, an expansion moving part is sleeved outside each unequal-height arc-shaped entity, and a NiTi alloy support is sleeved outside each expansion moving part; the expansion moving part slides along the outer contour surface of the unequal-height arc-shaped entity, so that the diameter of the cylindrical surface where the periphery of the expansion moving part is located is gradually increased, and the expansion of the NiTi alloy support is realized.

The expansion moving parts are a plurality of expansion sliding blocks, and the inner contour of each expansion sliding block is the same as the outer contour curve of the unequal-height arc-shaped entity and is in sliding contact with the unequal-height arc-shaped entity; the outer contour of the expansion sliding block is in contact with the inner wall of the NiTi alloy bracket.

When the expansion sliding blocks are folded, the outer contour forms a cylindrical surface, and the diameter of the cylindrical surface is smaller than the inner diameter of the NiTi alloy bracket.

The expansion moving part comprises an expansion plate, a sliding groove and a lining plate, the inner end edge of the expansion plate is in sliding contact with the outer contour of the unequal-height arc-shaped entity, the lining plate is movably connected to the outer end edge of the expansion plate, the middle part of the expansion plate penetrates through the sliding groove, when the expansion plate slides along with the outer contour of the unequal-height arc-shaped entity, the expansion plate moves in the sliding groove in the radial direction, and the expansion plate moves in the radial direction to drive the lining plate to expand in the radial direction and realize the expansion of the NiTi alloy support.

And the lining plates are positioned on the same hollow cylindrical surface when being folded, and the diameter of the hollow cylindrical surface is smaller than the inner diameter of the NiTi alloy bracket.

The outer contour curve of the unequal-height arc-shaped entity is one or more of an involute curve, a parabola curve, a sine curve or an exponential curve.

The number of the unequal-height arc-shaped entities is 3-8.

The base is in clearance fit with a lower end journal of the rotating shaft.

The caliber of the U-shaped groove of the fixing plate is slightly larger than the upper end journal of the rotating shaft.

The upper end part of the rotating shaft is in threaded connection with the handle.

The preferred four of unequal height arc entity, the rotation angle of rotation axis is 0 ~ 89.

The number of the connecting rods is 3-8.

The fixing plate is a solid plate with an opening.

The handle is a rectangular solid. The middle part of the handle is a round hole with internal threads.

The upper end part and the lower end part of the rotating shaft are round solid shafts. The unequal-height arc-shaped entity and the rotating shaft are integrated.

The invention has the beneficial effects that: the rotary shaft is adopted to expand the stent in a rotary mode, so that the uniform expansion and heat setting of the stent can be realized, and the expansion efficiency and precision are improved. When the rotary shaft is assembled and disassembled, the rotary shaft can be taken out only by reversely screwing out the rotary shaft, the operation is simple and rapid, and the practicability is high.

Drawings

FIG. 1 is a 0 ° schematic view of an embodiment of the present invention;

FIG. 2 is a schematic view of an embodiment of the present invention at 89 °;

FIG. 3 is a schematic view of a rotating shaft according to an embodiment of the present invention;

FIG. 4 is a schematic view of an expanding slide at 0 degrees according to an embodiment of the present invention;

FIG. 5 is a schematic view of an 89 position of an expanding slide according to an embodiment of the present invention;

FIG. 6 is a second 0 schematic representation of an embodiment of the present invention;

FIG. 7 is a second 89 ° schematic view of an embodiment of the present invention;

FIG. 8 is a schematic view of a second embodiment of a rotating shaft according to the present invention;

fig. 9 is a schematic view of an assembly of two expansion boards according to an embodiment of the present invention;

fig. 10 is a schematic view of a second expansion board according to an embodiment of the present invention;

FIG. 11 is a schematic view of a second chute of the embodiment of the invention;

FIG. 12 is a schematic view of a second liner plate according to an embodiment of the present invention;

fig. 13 is a force vector diagram.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

The first embodiment is as follows:

as shown in figure 1, the NiTi alloy frock clamp for the blood vessel stent heat setting mainly comprises a frame and an expansion mechanism: the frame consists of a base 1, a connecting rod 2 and a fixing plate 3; the expansion mechanism comprises a handle 4, a rotating shaft 5, an unequal-height arc-shaped solid body 51 and an expansion sliding block 6. The lower end journal of the rotating shaft (5) is placed in the center of the base (1), the upper end journal of the rotating shaft (5) is clamped in a U-shaped groove of the fixing plate (3), the other end of the rotating shaft (5) is connected with the handle (4), a plurality of unequal-height arc-shaped entities (51) are arranged in the middle of the rotating shaft (5), a plurality of expanding slide blocks (6) are sleeved outside the unequal-height arc-shaped entities (51), and NiTi alloy supports (7) are sleeved outside the expanding slide blocks (6); four angles of base (1) link firmly with the one end of connecting rod (2), fixed plate (3) link firmly with the other end of connecting rod (2).

The connecting rod 2 is used for connecting the base 1 and the fixing plate 3, the fixing plate 3 is used for limiting radial displacement of the rotating shaft 5, the base 1 and the fixing plate 3 ensure that the rotating shaft 5 is always perpendicular to the base 1 and the fixing plate 3, the upper end part of the rotating shaft 5 is placed in a U-shaped groove of the fixing plate 3, the other end of the rotating shaft 5 is in threaded connection with the handle 4, a plurality of unequal-height arc-shaped entities 51 are arranged in the middle of the rotating shaft 5, and when the rotating shaft 5 is in an initial position, the outer contour of the unequal-height arc-shaped entities 51 is completely coincided with the inner contour of the expansion sliding block 6. As shown in fig. 2, the rotation axis 5 rotates by an angle of 89 °, the expansion sliding block 6 slides on the outer contour of the unequal-height arc-shaped solid 51, at this time, the outer contour of the unequal-height arc-shaped solid 51 is partially overlapped with the inner contour of the expansion sliding block 6, the smaller the overlapping area is, the larger the expansion diameter is, the expansion sliding block 6 is sleeved with the NiTi alloy stent 7, and the expansion sliding block 6 expands the NiTi alloy stent 7 in the radial direction.

The middle part of the rotating shaft (5) is an unequal-height arc-shaped solid (51), and the shape is an involute.

The inner contour of the expanding slide block (6) is the same as the outer contour curve of the middle part of the rotating shaft (5).

The number of the connecting rods 2 is four.

The fixed plate 3 is a solid plate having an opening, and the diameter of the opening of the fixed plate 3 is larger than the diameter of the cylindrical body at the upper end of the rotating shaft 5.

The handle 4 is a rectangular solid, and the middle part of the handle 4 is a round hole with internal threads.

The upper end part of the rotating shaft 5 is in threaded connection with the handle 4.

As shown in fig. 3, the middle part of the rotating shaft 5 is a non-equal height arc-shaped solid body 51, and the upper and lower end parts are circular solid shafts.

As shown in fig. 4, the slide 6 is rotated by 0 °, and as shown in fig. 5, the slide 6 is rotated by 89 °.

Example two:

as shown in FIG. 6, the NiTi alloy tool clamp for the heat setting of the intravascular stent mainly comprises a frame and an expansion mechanism: the frame consists of a base 1, a connecting rod 2 and a fixing plate 3; the expansion mechanism consists of a handle 4, a rotating shaft 5, an unequal-height arc-shaped solid body 51, an expansion plate 61, a sliding chute 62 and a lining plate 8. Base 1 center is clearance fit with the one end of rotation axis 5, in order to restrict 5 radial displacement of rotation axis, four angles of base 1 are interference fit with the one end of connecting rod 2, four angles of fixed plate 3 are interference fit with the other end of connecting rod 2, the effect of connecting rod 2 is connected base 1 and fixed plate 3, the effect of fixed plate 3 is for restricting 5 radial displacement of rotation axis, base 1 guarantees rotation axis 5 with fixed plate 3 all the time with base 1, fixed plate 3 is mutually perpendicular, the upper end part of rotation axis 5 is put in the round hole of fixed plate 3, the other end and the 4 threaded connection of handle of rotation axis 5, the middle part of rotation axis 5 has the unequal height arc entity 51 of a plurality of, unequal height arc entity 51 contacts with expansion plate 61. As shown in fig. 7, the rotation shaft is rotated by 5 to 89 °, one end of the expansion plate 61 slides on the outer contour of the unequal-height arc-shaped solid body 51, the middle part of the expansion plate 61 moves in the sliding groove 62, the sliding groove 62 keeps the relative position of the expansion plate 61 unchanged in the spatial position, the liner plate 8 is sleeved outside the expansion plate 61, the NiTi alloy bracket 7 is sleeved outside the liner plate 8, and the NiTi alloy bracket 7 is expanded by the expansion plate 61 in the radial direction.

As shown in fig. 6, in the initial state, the expansion plate 61 is at the bottom of the unequal-height arc-shaped solid 51, as shown in fig. 7, the rotating shaft is rotated by 5 to 89 °, one end of the expansion plate 61 slides on the outer contour of the unequal-height arc-shaped solid 51, the lining plate 8 is sleeved outside the other end of the expansion plate 61, the NiTi alloy support 7 is sleeved outside the lining plate 8, and when the expansion plate 61 slides on the unequal-height arc-shaped solid 51, the lining plate 8 expands outwards, and accordingly the NiTi alloy support 7 expands.

As shown in fig. 8, the middle part of the rotating shaft 5 is a non-equal height arc-shaped solid body 51, and the upper and lower end parts are circular solid shafts.

The outer contour of the unequal-height arc-shaped solid 51 is a parabola, and the number of the expansion plates 61, the sliding grooves 62 is the same as that of the unequal-height arc-shaped solid 51, and is 3-8.

As shown in fig. 9, the slide groove 62 is spatially formed in 360 °, and the expansion plate 61 moves in the slide groove 62.

The expansion plate 61 is shown in fig. 10, and the slide groove 62 is shown in fig. 11.

As shown in fig. 12, the lining plate 8 is a hollow cylinder formed by four circular arc-shaped cylinders, and the diameter of the hollow cylinder formed by the four circular arc-shaped cylinders is slightly smaller than the inner diameter of the NiTi alloy bracket 7.

The force vector diagram is shown in fig. 13:

F₂＝F₁tana (3)

t is the torque applied by rotation of the handle, F₁Is a circumferential force; f_nIs a normal force; f₂Is a radial force; alpha is a pressure angle; d is the base circle diameter.

In the present invention, as seen in fig. 13, the pressure angle of the spreading slide is less than 90 °, so the spreading slide is easier to spread.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.