KR102395506B1 - Medical Stent - Google Patents

Abstract

The present invention relates to a medical stent, and in particular, by repeatedly moving a pattern of bending a wire up and down from one end to the other end along the circumferential surface of the jig, cells of the same shape are repeated by the intersection between the wires It is formed and is provided in a cylindrical shape as a whole, and each cell is provided as a parallelogram in which a pair of opposite sides are provided in a straight line in the axial direction of the jig.
Thereby, even if compressed or expanded in the radial direction, it is possible to minimize the change in the axial length of the cell, so it is possible to minimize the length of the stent delivery during the stent insertion procedure, and even if it is expanded after insertion, the change in the insertion position can be reduced. can be minimized

Description

Medical Stents

The present invention relates to a medical stent, and in particular, it is possible to minimize the change in axial length during radial compression or expansion, thereby minimizing the length of stent delivery during the stent insertion procedure, and after insertion It relates to a medical stent that can minimize the change in the insertion position even if it is expanded.

In general, a stent is used for the purpose of expanding the affected part of the lumen of the human body in which the passage is narrowed due to disease, trauma, surgery, etc. to its original state.

These stents are known to have various structures, and generally include a cylindrical wire structure formed to have a peak portion and a valley portion along the circumference by winding a wire in a specific way, and a cover film formed in a state surrounding the wire structure. is composed

These stents generally have a cylindrical structure in their overall shape, and can be contracted by applying an external force because they have an elastic force.

In most conventional wire-type stents, as shown in FIG. make up a cell

In order to move the stent to the affected area during the insertion procedure, the stent is compressed in the radial direction to minimize the outer diameter and inserted into the inside of the stent delivery. is restored

However, in the conventional stent, the cell shape is usually provided in a rhombus shape, and since the change in the axial length of each cell during radial compression is large, there is a problem that the length of the stent delivery becomes longer by that much, and above all, the length of the stent in the affected area is As it was reduced, the position was changed, and there was a problem in that it was not guaranteed to be seated at the exact location of the affected area.

Registered Patent Publication No. 10-0320239

Therefore, it is an object of the present invention, even if compressed or expanded in the radial direction, it is possible to minimize the change in the axial length of the cell, so that it is possible to minimize the length of the stent delivery during the stent insertion procedure, and even if it is expanded after insertion An object of the present invention is to provide a medical stent that can minimize the change in the insertion position.

The above object is, according to an embodiment of the present invention, by repeatedly moving a pattern of bending the wire up and down from one end to the other end along the circumferential surface of the jig, the cells of the same shape by the intersection between the wires It is formed repeatedly and is provided in a cylindrical shape as a whole, and each cell is achieved by a medical stent provided in a parallelogram in which a pair of opposite sides are provided in a straight line in the axial direction of the jig.

Here, the pattern is that the first wire increases by 2 horizontal pitches (Ph) and 2 vertical pitches (Pv) in the lower right diagonal from the first starting point of the top end of the jig, and then 1 vertical pitch (Pv) rises to the bottom end of the jig A repeating first pattern, and the first wire at the lower end of the jig rises by 1 vertical pitch (Pv), then increases by 1 horizontal pitch (Ph) and decreases by 1 vertical pitch (Pv) in the lower right diagonal direction. It may be provided as a second pattern that repeats up to the uppermost end of the jig by repeating the rise of 2 vertical pitches (Pv) at a point before overlapping with the first wire of the pattern.

Meanwhile, in the first pattern and the second pattern, each of the moved horizontal pitches Ph and vertical pitches Pv may be increased by a multiple of the same ratio, thereby enabling the size of the cell to be changed.

In this case, a first cell formed by the first wire and a second cell formed by the second wire are included, wherein the first cell and the second cell intersect left and right by a set horizontal pitch Ph. and can be provided.

Specifically, in the first cell, after the first wire increases by 4 horizontal pitches (Ph) and decreases by 4 vertical pitches (Pv) in the right downward direction from the first starting point of the top end of the jig, 2 vertical pitches (Pv) The first pattern repeats rising to the bottom end of the jig, and at the bottom end of the jig, the first wire rises by 2 vertical pitches (Pv) and then descends by 2 horizontal pitches (Ph) and 2 vertical pitches (Pv) diagonally downward to the right. is formed in a second pattern that repeats 4 vertical pitch (Pv) rise from a point before overlapping with the first wire of the first pattern to the top end of the jig while repeating, and the second cell is a second wire At the second starting point where the first wire of the lowermost end of the jig does not pass, 4 horizontal pitches (Ph) decrease and 4 vertical pitches (Pv) rise to the left upper diagonal, and then 2 vertical pitches (Pv) fall to the top end of the jig. A third pattern that repeats, and the second wire from the top of the jig descends by 2 vertical pitches (Pv) and then decreases by 2 horizontal pitches (Ph) and increases by 2 vertical pitches (Pv) in an upper left diagonal direction while repeating the third pattern It may be formed as a fourth pattern repeating 4 vertical pitch (Pv) descending from a point before overlapping with the second wire of the jig to the bottom end of the jig.

Therefore, even if the medical stent of the present invention is compressed or expanded in the radial direction, it is possible to minimize the change in the axial length of the cell, so it is possible to minimize the length of the stent delivery during the stent insertion procedure, and even if it is expanded after insertion Changes in the insertion position can be minimized.

In addition, since the medical stent according to the present invention can be manufactured by easily changing the size of the cell according to the use, it is possible to manufacture a cell of an appropriate size according to the radial resistance.

In addition, in the medical stent according to the present invention, since a plurality of cells can be generated to cross by a set pitch, the size of each cell can be relatively large to improve manufacturing efficiency, and at the same time, the radius by crossing a plurality of cells There is an advantage in that resistance to directional external forces can be increased.

1 is a main view of a cell of a conventional medical stent,
2 is a photograph of a medical stent according to an embodiment of the present invention;
3 is a pattern formation diagram of a medical stent according to a first embodiment of the present invention;
4 is a pattern formation diagram of a medical stent according to a second embodiment of the present invention;
5 is a pattern formation diagram of a medical stent according to a third embodiment of the present invention;
6 is a cross-sectional view of a jig for manufacturing a medical stent according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figure 2, the medical stent (1) according to the present invention, by repeatedly moving a pattern for bending the wire up and down from one end to the other end along the circumferential surface of the jig 100, the intersection between the wires Cells C of the same shape are repeatedly formed by the , and are provided in a cylindrical shape as a whole, and each cell C is provided in a parallelogram in which a pair of opposite sides are provided in a straight line in the axial direction of the jig 100 .

In the present invention, the cell (C) may be provided in a parallelogram as shown in FIGS. 2 to 4, but may be formed in a pentagonal or hexagonal polygon as long as it is provided in a straight line in the axial direction.

Alternatively, a straight line in the axial direction may be provided in various shapes such as an arc in addition to a straight line.

Hereinafter, each embodiment will be described in detail.

Referring to Figure 3, the pattern formation of the medical stent (1) according to the first embodiment of the present invention will be described.

In the medical stent 1 according to the first embodiment of the present invention, the first wire W1 forms a first cell C1 with a first pattern P1 and a second pattern P2.

The first wire (W1) starts at the first starting point (x1, y1) of the uppermost end of the jig 100 and proceeds to the lowermost end (x1, y22) in the first pattern (P1), and then toward the uppermost end (y1) It proceeds to the second pattern (P2).

The first pattern (P1), the first wire (W1) from the first starting point (x1, y1) to the lower right diagonally 2 horizontal pitch (Ph) increase and 2 vertical pitch (Pv) after falling, 1 vertical pitch (Pv) ) proceeds up to the lowermost end (y22) of the jig 100.

Hereinafter, the horizontal pitch (Ph) and the vertical pitch (Pv) may be provided with the same length, but is not limited thereto, and thus may be provided with different lengths.

After the first wire (W1) reaches the lowest end (y22) of the jig 100, the second pattern (P2) rises by one vertical pitch (Pv) (x1, y22) and then one horizontal pitch (Ph) to the lower right side diagonally The point at which the increase and fall of 1 vertical pitch (Pv) are repeated (x2, y22), and overlap with the first wire of the first pattern (P1) (that is, the point of falling diagonally from (x10, y21) to (T1, y22)) The first cell (C1) is formed by 1 cell while repeating the rise of 2 vertical pitches (Pv) (that is, rising to (x10, y20)) at the point (x10, y22) before the overlapping), and the Proceed to the topmost stage (y1).

Thereafter, the first wire W1 repeats one rise and one diagonal fall between y20 and y21, and rises by two vertical pitches Pv at (x8, y21) to continue performing the second pattern P2.

Referring to the enlarged view of FIG. 3 , the first cell C1 formed by the first pattern P1 and the second pattern P2 has a width of one horizontal pitch Ph and a length of two vertical pitches Pv. and has a parallelogram shape in which a pair of sides C1-1 and C1-3 are provided in a straight line in the axial direction (a) of the jig 100 .

Therefore, the medical stent 1 according to the first embodiment of the present invention has the advantage that it is possible to minimize the change in the axial length of the cell even if it is compressed or expanded in the radial direction (r).

Medical stent (1) according to the present invention, the first pattern (P1) and the second pattern (P2) by increasing each horizontal pitch (Ph) and vertical pitch (Pv) to be moved by a multiple of the same ratio of the cell (C) It is provided so that the size can be changed.

4 is a pattern diagram of a medical stent 1 according to a second embodiment of the present invention, wherein the movement pitch ratio of the first pattern P1 and the second pattern P2 described above in the first embodiment is fixed. , shows an example in which the transfer rate is increased by a factor of 2.

That is, in the first embodiment (FIG. 3), if the first pattern P1 increases by 2 horizontal pitches (Ph) and decreases by 2 vertical pitches (Pv) in the lower right diagonal direction, and then increases by 1 vertical pitch (Pv), the second In the embodiment, the pattern of increasing by 2 vertical pitches (Pv) after increasing by 4 horizontal pitches (Ph) and decreasing by 4 vertical pitches (Pv) is repeated. In the case of the second pattern P2, it proceeds twice as much as the first pattern P1.

Accordingly, the size of the cell C may be varied by changing the movement ratio while the movement pitch ratio of each pattern P is fixed.

Here, the movement ratio can be adjusted in various multiples of 3 or more, and since the absolute lengths of the vertical pitch (Pv) and the horizontal pitch (Ph) can also be changed, they can be combined to form cells (C) of various sizes.

Here, when the size of the cell C is reduced as in the first embodiment, since the cell C is densely formed, a relatively large amount of wire is consumed and the working time is increased compared to the second embodiment, but in the radial direction The resistance to the compressive force can be relatively large. Therefore, it is possible to manufacture a cell of an appropriate size in consideration of the radial resistance according to the use of the medical stent (1).

The medical stent 1 according to the present invention may be provided by using a plurality of wires (W) to form a plurality of cells (C), and to cross each formed cell at a set pitch.

Hereinafter, an embodiment in which the first cell C1 and the second cell C2 are intersected left and right by 1 horizontal pitch Ph will be described as an example, but the intersecting horizontal pitch Ph is 2 horizontal pitches (Ph) or 3 horizontal pitches (Ph), etc., can be provided in various ways, and horizontally crossing as well as vertically crossing, horizontally or vertically at the same time (for example, 1 horizontal pitch (Ph) and 1 horizontal pitch (Ph)) Various changes are possible, such as intersecting with

With reference to FIG. 5, a medical stent 1 according to a third embodiment of the present invention will be described.

In FIG. 5 , the method of forming the first cell C1 is the same as that of the above-described second embodiment, so this will be omitted, and the method of forming the second cell C2 will be mainly described.

The second cell C2 may be formed in a third pattern P3 and a fourth pattern P4 using the second wire W2 .

The third pattern (P3), the second wire (W2) at the lower end (y22) of the jig 100, the first wire (W1) does not pass through the second starting point (x8, y21) at the upper left diagonally 4 horizontal pitches After (Ph) decrease and 4 vertical pitch (Pv) rise (ie, move to (x4, y17)), 2 vertical pitch (Pv) descent (x4, y19) is repeated until the top end (y1) of the jig 100.

The fourth pattern (P4) is, after the second wire (W2) reaches the third pattern (P3) up to the uppermost end (x10, y1) of the jig 100, 2 vertical pitches (Pv) fall (x10, y3) and repeats 2 horizontal pitch (Ph) decrease and 2 vertical pitch (Pv) increase (that is, move to (x8, y1)) diagonally to the upper left, and overlaps with the second wire (W2) of the third pattern (P3) It is repeatedly formed to the lowest end of the jig 100 by repeating the 4 vertical pitch (Pv) descending (x4, y5) from the previous point (x4, y1).

Referring to the enlarged view of FIG. 5 , the first cell C1 is generated by the first wire W1, and the second cell C2 is generated by the second wire W2, and each cell ( C1 and C2 are generated by crossing left and right by one horizontal pitch (Ph).

Medical stent 1 according to the third embodiment of the present invention described above, a plurality of cells (C) are generated to cross by a set pitch, so that the size of each cell (C) is relatively large to improve manufacturing efficiency. On the other hand, there is an advantage in that resistance to radial external force can be increased by forming a plurality of cells (C) to cross each other.

1: Medical stent
W: wire W1: first wire
W2: 2nd wire
C: cell
C1: first cell C2: second cell
C1-1, C1-2. C1-3. C1-4: each side of the cell
P: pattern
P1: first pattern P2: second pattern
P3: third pattern P4: fourth pattern
100: jig

Claims (5)

By repeatedly moving a pattern of bending a wire up and down from one end to the other end along the circumferential surface of the cylindrical jig, cells of the same shape are repeatedly formed by the intersection between the wires and are provided in a cylindrical shape as a whole, Each cell is a medical stent having a shape of a parallelogram with a pair of opposite sides arranged in the axial direction of the jig. According to claim 1,
The pattern is that the first wire increases by 2 horizontal pitches (Ph) and 2 vertical pitches (Pv) in the lower right diagonal from the first starting point of the top end of the jig, and then repeats 1 vertical pitch (Pv) rise to the bottom end of the jig In the first pattern and the lowermost end of the jig, the first wire rises by 1 vertical pitch (Pv) and then increases by 1 horizontal pitch (Ph) and decreases by 1 vertical pitch (Pv) diagonally to the lower right side of the first pattern. A medical stent prepared in a second pattern that repeats the rise of 2 vertical pitches (Pv) from the point before overlapping with the first wire to the top of the jig. 3. The method of claim 2,
The first pattern and the second pattern is a medical stent capable of changing the size of the cell by increasing each of the moving horizontal pitch (Ph) and vertical pitch (Pv) by a multiple of the same ratio. 4. The method of claim 3,
A first cell formed by the first wire and a second cell formed by a second wire, wherein the first cell and the second cell intersect left and right by a set horizontal pitch Ph. Medical stents. 5. The method of claim 4,
In the first cell, after the first wire increases by 4 horizontal pitches (Ph) and 4 vertical pitches (Pv) fall in a right downward direction from the first starting point of the top end of the jig, 2 vertical pitches (Pv) rise. The first pattern repeats up to the bottom of the jig, and the first wire at the bottom of the jig rises by 2 vertical pitches (Pv), and then 2 horizontal pitches (Ph) and 2 vertical pitches (Pv) descending diagonally to the lower right while repeating the falling Formed in a second pattern that repeats 4 vertical pitch (Pv) rise to the top end of the jig at a point before overlapping with the first wire of the first pattern,
In the second cell, the second wire decreases by 4 horizontal pitches (Ph) and 4 vertical pitches (Pv) rises in the upper left diagonal at the second starting point where the first wire at the bottom end of the jig does not pass, then 2 vertical pitches (Pv) a third pattern of repeating descending to the uppermost end of the jig, and the second wire from the uppermost end of the jig descends by 2 vertical pitches (Pv) and then decreases by 2 horizontal pitches (Ph) and 2 vertical pitches (Pv) ) A medical stent formed in a fourth pattern that repeats 4 vertical pitch (Pv) descent from the point before overlapping with the second wire of the third pattern while repeating the rise to the lowest end of the jig.

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