KR20230076165A - manufacturing method of medical spinning thread having non circle section for barb thread making - Google Patents

Abstract

The present invention relates to a method for manufacturing a medical thread that is spun while having a non-circular cross section for manufacturing a barbed suture, and includes a nozzle ( 100) By supplying the biodegradable polymer in a molten state to the inside, the biodegradable polymer is melt-extruded to the end of the radiation hole 130, and the radiation hole 130 has a core forming part 131 forming a circular cross-sectional shape, and the It communicates with the core forming portion 131 and is composed of a barb forming portion 132 protruding radially outward from the core forming portion 131, so that the extruded filament is connected to the core portion 11 having a circular cross-sectional shape, and the core portion ( 11) The barb portion 12 protruding radially outward is formed, but the inner diameter (a) of the core forming portion 131, the width of the point where the barb forming portion 132 and the core forming portion 131 meet ( b) a melt extrusion step in which the length (c) from the end of the core forming part 131 to the end of the barb forming part 132 is made in a ratio of 10:6.1 to 6.9:4.1 to 6.7; a cooling step of cooling the filament discharged from the nozzle 100 by passing it through a cooling water tank 2 in which cooling water is stored; and a drawing step of manufacturing a medical thread by heating and drawing the filament that has passed through the cooling step through an oven 4 and a drawing roller 3.
According to the present invention, in manufacturing a thread provided for manufacturing a barbed suture, the thread is divided into a core portion, which is a region that is not damaged due to cutting or pressing during barb forming, and a barb portion in which barb processing is performed, Through the extrusion process, the core part and the barb part can be integrally molded, so that the performance of the barb can be exhibited while minimizing damage to the core part during subsequent barb processing.
Furthermore, since the ratio of the diameter of the core part and the width and length of the barb part is limited, the strength of the core part and the function of the barb can be maintained smoothly.
In addition, as the thread is extruded into a non-circular cross section, a groove is formed on the contact surface of the roller during the drawing process, and drawing is performed while the barb is inserted into the groove, so that the shape of the barb of the thread to be finally manufactured can be made constant. .

Description

Manufacturing method of medical spinning thread having non circle section for barb thread making}

The present invention relates to a method for manufacturing a medical thread used for pain relief, skin beauty, plastic surgery, body shaping, skin lifting, etc. by stimulating the acupuncture point by embedding (embedding) therapy, and solves the problem of lowering the strength of the core part due to barb formation. A method for producing a medical thread having a non-circular cross-section for the production of a barbed suture, capable of being released.

Recently, as interest in beauty has increased, various types of threads (sutures, embedding threads, or lifting threads) are used in the case of performing procedures to remove sagging and wrinkles of tissue or skin caused by aging, decrease in skin elasticity, trauma, etc. (also called thread) is used.

The lifting procedure using the thread is a medical technique that lifts or pulls sagging skin and tissues such as the face, chin, neck, abdomen, etc. using a needle and thread without using a knife, and does not require excessive incision of the skin It is getting a lot of attention because it can minimize the occurrence of scars.

In the lifting procedure, after inserting a thread through the hole of a medical needle and penetrating it into the skin tissue of the patient, the tip of the needle is placed under the wrinkles of the patient in need of skin improvement, and then the operator presses the area near the epidermis with a finger to penetrate the skin tissue into the skin tissue. As the needle is discharged from the skin tissue in a state where the thread discharged through the hole of the needle is pressurized and fixed, only the thread inserted into the needle remains inside the skin tissue.

The thread remaining in the skin tissue is melted and absorbed in the body after several months have elapsed after the procedure.

At this time, the thread becomes a factor inducing wound stimulation in the skin tissue and promotes cellular activities such as the production of immune substances such as elastin and collagen that heal wounds, so that the thread passes through the body tissue in the process of healing. A sense of volume is created by immune substances generated around the skin, which can continuously maintain a lifting state that pulls the skin tissue.

Therefore, various effects such as maintaining sagging skin in a taut state, smoothing out wrinkles, and improving elasticity, as well as improving blood circulation and lymphatic circulation of the skin and improving skin moisturizing power can be obtained.

In general, it is common to form a plurality of protrusions or grooves on the outer circumferential surface of the medical thread to increase knotting or lifting efficiency.

As a processing method for forming such protrusions or grooves, in the "suture barb forming device" (Korean Patent Registration No. 10-2011032, Patent Document 1), the surface of a yarn having a circular cross-section is scraped off with a heated cutter to form barbs. technology has been disclosed.

As such, in the process of scraping the surface of a yarn having a circular cross-section, the core portion is relatively small, so that the strength of the core portion is not sufficiently secured, resulting in a problem in that the thread is broken during the procedure.

In order to solve this problem, when the depth and thickness of scraping for barb formation are reduced, on the contrary, there is a problem that the thread comes out during the procedure and the procedure effect is not satisfactory.

As another technology, in "Apparatus for manufacturing medical sutures and method for manufacturing medical sutures" (Korean Patent Registration No. 10-1779922, Patent Document 2), the yarns are pressurized using a molding device formed radially by surrounding yarns of circular cross section. A technique for forming protrusions (barbs) by doing so has been disclosed.

Patent Document 2 has the advantage of reducing damage to the yarn by not cutting compared to Patent Document 1, but the point where the protrusion is formed by pressing is made smaller in diameter than the point where it is not, so the strength of the thread is still reduced. There is also a problem that the insertion of the thread cannot be performed smoothly due to the non-uniform diameter depending on the operation method.

In particular, since the length of the barb formed by pressing does not secure a sufficient length, when it is actually applied to the human body, the lifting effect is reduced due to the decrease in tensile force due to the small frictional force acting on the skin.

KR 10-2011032 (2019.08.08) KR 10-1779922 (2017.09.13)

The method of manufacturing a medical thread having a non-circular cross section for manufacturing a barbed suture according to the present invention is intended to solve the above-described problems in the prior art, and manufactures a thread provided for manufacturing a barbed suture. In doing so, the thread is divided into a core portion, which is an area that is not damaged by cutting or pressing during barb forming, and a barb portion in which barb processing is performed. This is to ensure that the performance of the barbs can be exhibited while minimizing damage to the core during processing.

Furthermore, the ratio of the diameter of the core part and the width and length of the barb part is limited so that the strength of the core part and the function of the barb can be maintained smoothly.

In addition, as the thread is extruded into a non-circular cross section, a groove is formed on the contact surface of the roller during the drawing process, and the drawing is performed while the barb is inserted into the groove, so that the shape of the barb of the thread to be finally manufactured can be made constant. will be.

In order to solve the above problems, the method for manufacturing a medical thread spun with a non-circular cross section for manufacturing a barbed suture of the present invention has an extruder equipped with a nozzle 100 having a spinning hole 130 formed at an end thereof ( The biodegradable polymer is supplied in a molten state to the inside of the nozzle 100 of 1) to melt and extrude the biodegradable polymer to the end of the radiation hole 130, and the radiation hole 130 has a circular cross-sectional shape. 131) and a barb forming part 132 which is in communication with the core forming part 131 and protrudes radially outward from the core forming part 131, so that the extruded filament is connected to the core part 11 having a circular cross-section shape. , so that the barbs 12 protruding radially outward from the core part 11 are formed, but the inner diameter a of the core forming part 131, the barb forming part 132 and the core forming part 131 are The melting extrusion step in which the width (b) of the meeting point and the length (c) from the end of the core forming part 131 to the end of the barb forming part 132 are made in a ratio of 10: 6.1 to 6.9: 4.1 to 6.7. and; a cooling step of cooling the filament discharged from the nozzle 100 by passing it through a cooling water tank 2 in which cooling water is stored; and a drawing step of manufacturing a medical thread by heating and drawing the filament that has passed through the cooling step through an oven 4 and a drawing roller 3.

In the above configuration, in the thread 10 manufactured in the drawing step, the diameter of the core part 11 is 0.3 to 0.35 times the diameter of the core forming part 131, and the core part 11 The diameter (d), the width (e) of the point where the barbs 12 and the core part 11 meet, and the length f from the end of the core part 11 to the end of the barb part 12 are 10: 3.8 ~ 5.5: It is characterized by consisting of a ratio of 3.5 ~ 4.0.

In the above configuration, a barb insertion groove 31 into which the barb portion 12 of the filament is inserted is formed on the surface of the elongating roller 3 so that the shape of the barb portion 12 can be maintained. do.

In the above configuration, a plurality of the oven 4 and the elongating roller 3 are installed in succession along the direction in which the filament travels so that the heating and elongation of the filament proceeds alternately and repeatedly, but each elongating roller 3 They are characterized in that the width and depth of the barb insertion groove 31 gradually decrease along the traveling direction.

In the above configuration, the barb insertion groove 31 is characterized in that both side wall surfaces are formed in a rounded shape.

According to the present invention, in manufacturing a thread provided for manufacturing a barbed suture, the thread is divided into a core portion, which is a region that is not damaged due to cutting or pressing during barb forming, and a barb portion in which barb processing is performed, Through the extrusion process, the core part and the barb part can be integrally molded, so that the performance of the barb can be exhibited while minimizing damage to the core part during subsequent barb processing.

Furthermore, since the ratio of the diameter of the core part and the width and length of the barb part is limited, the strength of the core part and the function of the barb can be maintained smoothly.

In addition, as the thread is extruded into a non-circular cross section, a groove is formed on the contact surface of the roller during the drawing process, and drawing is performed while the barb is inserted into the groove, so that the shape of the barb of the thread to be finally manufactured can be made constant. .

1 and 2 are photographs and drawings showing a state in which an extruder, a cooling water tank, an oven, an elongation roller, etc. are arranged for the process of the present invention to proceed.
Figure 3 is a partially cut perspective view specifically showing an example of a nozzle for melt extrusion in the present invention.
Figure 4 is a perspective view and a cross-sectional enlarged view showing an example in which a groove is formed so that a barb portion can be inserted and guided in the elongation roller in the present invention.
Figure 5 is a cross-sectional view showing a comparison of the size and shape of the radiation hole of the cross-shaped nozzle and the manufactured thread in the present invention.
Figure 6 is a cross-sectional view showing a comparison of the size and shape of the radiation hole of the straight nozzle and the manufactured thread in the present invention.
Figure 7 is a photograph showing a comparison of threads immediately after extrusion, drawing, and manufacturing of a comparative example.
8 is a photograph showing a comparison of threads immediately after extrusion, drawing, and manufacturing in Example 1;

Hereinafter, a method for manufacturing a medical thread spun with a non-circular cross section for manufacturing a barbed suture according to the present invention will be described in detail with reference to the accompanying drawings.

1. Melt extrusion step

The biodegradable polymer is supplied in a molten state to the extruder 1 shown in FIGS. 1 and 2 and extruded.

As for the temperature conditions of the extruder 1, 150-210 degreeC is preferable.

At this time, the extruder 1 is provided with a nozzle 100 having a radiation hole 130 formed at the end, as shown in FIG.

The nozzle 100 is composed of a head 110 having a radiation hole 130 and a support member 120 attaching the head 110 to an extruder.

At this time, a seating groove 121 for mounting the head 110 is formed in the support member 120, and a filtrate storage groove 122 is formed around the bottom surface of the seating groove 121.

When the head 110 is coupled to the support member 120, the polymer remaining in the space where the polymer is supplied in the center of the support member 120 is connected to the head 110 in the filtrate storage groove 122. By temporarily moving to the filtrate storage groove 122 along the filtrate storage groove 122 and allowing it to be accommodated, the residual polymer inside the support member 120 blocks the inside of the head 110 or prevents the molding from being prevented from being smoothly performed due to the residue. do.

As shown in FIG. 3, the radiation hole 130 communicates with the core forming part 131 having a circular cross-section and protrudes radially outward from the core forming part 131 while communicating with the core forming part 131. It consists of a barb forming portion 132.

Accordingly, the melt-extruded filament forms a core portion 11 having a circular cross-section and a barb portion 12 radially protruding outward from the core portion 11 .

At this time, the inner diameter (a) of the core forming portion 131, the width (b) of the point where the barb forming portion 132 and the core forming portion 131 meet, and the barb forming portion from the end of the core forming portion 131 ( 132) is characterized in that the length (c) to the end is made at a ratio of 10: 6.1 to 6.9: 4.1 to 6.7.

If the width b of the point where the barb forming part 132 and the core forming part 131 meet is less than 6.1, or the length from the end of the core forming part 131 to the end of the barb forming part 132 (c) When is less than 4, the width of the core portion 11 of the manufactured thread becomes too small, which means that the barb width becomes small, and as a result, the suture easily comes out of the skin tissue during the procedure.

Conversely, if the width (b) of the point where the barb forming part 132 and the core forming part 131 meet exceeds 6.9, the entire width (or diameter) of the manufactured suture is limited, and thus the core part 11 ) means that the diameter of the suture becomes smaller, which eventually causes the suture to break during the procedure because sufficient tensile strength is not secured.

In addition, when the width (b) of the point where the barbs 132 and the core-forming part 131 meet exceeds 6.9, when removing the barbs 12 by partially cutting or compressing them in a subsequent process, the connected There is a problem in that the cutting of the barbs 12 is not easily performed because the area of the portion is large.

From another point of view, when four barbs 12 are formed at an angle of 90 degrees with respect to the core part 11, that is, the width of the point where the barbs 132 and the core forming part 131 meet ( When b) exceeds 6.9, the core forming part 131 is not located at the point where the walls of the adjacent barb forming parts 132 meet each other, and is bent at an angle of 90 degrees, so that the raw material is not smoothly supplied to this part. As a result, the surface is not formed evenly during extrusion molding.

More preferably, when the thread is extruded crosswise, the inner diameter (a) of the core forming portion 131, the width (b) of the point where the barb forming portion 132 and the core forming portion 131 meet, and the core forming portion ( 131) to the end of the barbed portion 132, the length (c) is preferably made in a ratio of 10: 6.1 to 6.4: 4.1 to 5.5,

When the thread is extruded in a straight line (when two barbs are formed at an angle of 180 degrees), the inner diameter (a) of the core forming part 131, the point where the barb forming part 132 and the core forming part 131 meet The width (b) and the length (c) from the end of the core forming portion 131 to the end of the barb forming portion 132 are preferably 10:6.5 to 6.9:5.6 to 6.7.

2. Cooling stage

As shown in FIGS. 1 and 2 , the filament discharged from the nozzle 100 is cooled by passing through a cooling water tank 2 in which cooling water is stored.

The speed of movement of the filament passing through the cooling water tank 2 is preferably about 2 to 7 m per minute.

3. Stretching step

As shown in FIGS. 1 and 2 , the filament that has passed through the cooling step is passed through an oven 4 and an elongating roller 3 to be heated and stretched to manufacture a medical thread.

It is preferable that the oven 4 and the elongation roller 3 are repeatedly provided with a plurality of each other as shown.

At this time, the temperature of the oven 4 is maintained at about 90 to 170° C., and the moving speed of the filament is about 20 to 30 m per minute.

The manufactured filament is wound around the bobbin (5).

In the stretching process, the filament is stretched by the pulling force while receiving heat, and the cross-sectional area is reduced accordingly.

However, when the portion in contact with the surface of the elongating roller 3 becomes the part between the barbs during stretching by receiving heat, the angle between the barbs is distorted while the barbs are stretched by the pulling force, and the size and shape of each barb is increased. This change occurs.

In order to suppress this phenomenon, as shown in FIG. 4 , a barb insertion groove 31 into which the barb 12 of the filament is inserted is formed on the surface of the elongating roller 3 to shape the barb 12. It is desirable to be able to maintain.

At this time, as shown in the drawing, the barb insertion groove 31 preferably has both side walls rounded so that the barb portion of the filament can be smoothly inserted.

On the other hand, as shown in FIGS. 1 and 2, a plurality of ovens 4 and elongating rollers 3 are continuously installed along the filament travel direction so that the filaments can be heated and stretched alternately and repeatedly. At this time, it is preferable that the width and depth of the barb insertion groove 31 of each of the elongating rollers 3 gradually decrease along the traveling direction.

In the thread 10 manufactured by the above manufacturing method, the diameter of the core part 11 is 0.3 to 0.35 times the diameter of the core forming part 131, and the diameter of the core part 11 (d) ), the width (e) of the point where the barbs 12 and the core part 11 meet, and the length f from the end of the core part 11 to the end of the barb part 12 are 10: 3.8 to 5.5 : It is preferably made in a ratio of 3.5 to 4.0.

Specifically, in the thread 10 manufactured when the radiating hole is formed in a cross shape, the diameter of the core part 11 is 0.3 to 0.32 times the diameter of the core forming part 131, and the core part 11 The diameter (d), the width (e) of the point where the barbs 12 and the core part 11 meet, and the length f from the end of the core part 11 to the end of the barb part 12 are 10 : 4.6 ~ 5.5: preferably made in a ratio of 3.5 ~ 3.8,

In the thread 10 manufactured when the radiation hole is formed in a straight line, the diameter of the core part 11 is 0.33 to 0.35 times the diameter of the core forming part 131, and the diameter of the core part 11 (d), the width (e) of the point where the barbs 12 and the core part 11 meet, and the length f from the end of the core part 11 to the end of the barb part 12 are 10:3.8 It is preferably made in a ratio of ~ 4.5: 3.8 ~ 4.0.

The thread having been processed as described above is partially processed by cutting or compressing the barb portion 12 of the thread through a subsequent barb processing step to manufacture a barbed suture.

Hereinafter, examples and comparative examples of the present invention will be described.

<Manufacture Example 1> Manufacture of a thread using a nozzle having a cross-shaped radiating hole

After manufacturing a nozzle having a cross-shaped radial hole having the specifications shown in Table 1 below, PDO (polydioxanone) is supplied as a biodegradable polymer raw material to the extruder shown in FIGS. After cooling by passing through a cooling water bath at a speed of 3 m per minute, a medical thread was prepared by passing through an oven at 150 ° C. and an elongating roller three times at a speed of 250 m per minute.

division a b c a+(2c) a' b' c' division Example 1 1.6 One 0.7 3 10 6.25 4.38 cross
radiation hole Comparative Example 1 1.68 0.75 0.55 2.78 10 4.46 3.27 Comparative Example 2 1.6 1.1 0.7 3 10 6.88 4.38 Comparative Example 3 1.32 0.82 0.84 3 10 6.21 6.36

(a: 'a' in FIG. 3, b: 'b' in FIG. 3, c: 'c' in FIG. 3)

b', c' are numbers showing the values of b and c when the values of a are all set to the same 10)

The dimensions of the manufactured threads were measured and shown in Table 2 below.

division d e f d+(2f) d' e' f' division Example 1 0.50 0.27 0.18 0.85 10 5.34 3.61 cross Comparative Example 1 0.59 0.16 0.17 0.93 10 2.71 2.88 Comparative Example 2 0.50 0.28 0.16 0.85 10 5.57 3.2 Comparative Example 3 0.46 0.24 0.20 0.85 10 5.32 4.37

(d: 'd' in FIG. 3, e: 'e' in FIG. 3, f: 'f' dimension in FIG. 3

e' and f' are numbers representing the values of e and f when all d values are set to the same 10)

Looking at the bars shown in Tables 1 and 2 above, it can be seen that in Comparative Example 1, the width (e) and length (f) of the barb portion 12 of the manufactured thread are both smaller than in Example 1, so that the barbs can easily come out during the procedure. can

In Comparative Example 2 and Comparative Example 3, the width (e) and length (f) of the barbs 12 are larger than those in Comparative Example 1.

However, in Comparative Example 2, the length (f) of the barb portion 12 is too small, so that the barb easily comes out during the procedure. It can be seen that the strength decreases.

<Manufacture Example 2> Manufacture of thread using a nozzle equipped with a straight-line radiating hole

In addition, after manufacturing a nozzle having a straight nozzle as shown in Table 3 below, a medical thread was manufactured in the same manner as in Preparation Example 1.

division a b c a+2c a' b' c' division Example 2 1.3 0.89 0.85 3 10 6.87 6.54 straight
radiation hole Comparative Example 4 1.32 0.95 0.84 3 10 7.20 6.36 Comparative Example 5 1.27 0.81 0.87 3 10 6.38 6.81 Comparative Example 6 1.56 0.82 0.72 3 10 5.26 4.62

(a: 'a' in FIG. 6, b: 'b' in FIG. 36, c: 'c' in FIG. 6)

b', c' are numbers showing the values of b and c when the values of a are all set to the same 10)

The dimensions of the manufactured threads were measured and shown in Table 4 below.

division d e f d+2f d' e' f' division Example 2 0.45 0.18 0.18 0.80 10 3.98 3.97 straight
radiation hole Comparative Example 4 0.45 0.18 0.16 0.77 10 4.06 3.59 Comparative Example 5 0.43 0.18 0.17 0.77 10 4.16 4.09 Comparative Example 6 0.52 0.18 0.11 0.75 10 3.44 2.17

(d: 'd' in FIG. 6, e: 'e' in FIG. 6, f: 'f' in FIG. 6)

e' and f' are numbers representing the values of e and f when all d values are set to the same 10)

Looking at the bars shown in Tables 3 and 4, in Comparative Examples 4 and 6, the length (f) of the barb portion 12 is relatively small, so that the barb easily comes out during the procedure. In the case of Comparative Example 5, the core portion 11 It can be seen that as the diameter (d) decreases, the tensile strength of the thread decreases.

The external appearance of the barbs of the threads prepared in Preparation Example 1 and Preparation Example 2 was enlarged and observed, and the results are shown in Table 5.

division detail Example 1 appropriate Example 2 appropriate Comparative Example 1 Lob width and length are small and uneven, inappropriate Comparative Example 2 The width of the barb is large and uneven, inappropriate Comparative Example 3 Lob width and length are large and uneven, inappropriate Comparative Example 4 Large barb width, inappropriate Comparative Example 5 Long barb length, inappropriate Comparative Example 6 Short barb length, unsuitable

7 shows a cross section of a filament immediately after melt extrusion of Comparative Example 1, a cross section of a filament after first drawing, and a cross section of a thread after completely ending drawing.

Looking at the middle drawing of FIG. 7 , it is shown that the ends of the barbs 12 are all slightly bent, and looking at the lower drawing of FIG. 7 , it can be seen that both the width and the length of the barbs 12 are made small. there is.

In this way, when the width (b) and the length (c) of the first barb forming portion 132 are made small, the barb portion 12 tends to be bent during the stretching process during manufacturing as well as after manufacturing, so that each barb portion 12 is It can be seen that it does not have an even directionality and the cross-sectional shape also becomes non-uniform.

FIG. 8 shows cross-sectional shapes of filaments immediately after melt extrusion, filaments after primary drawing, and threads after completion of manufacture in Example 1. FIG.

As can be seen from the drawing, it can be seen that not only the width and length of the barbs 12 are longer than those of Comparative Example 1, but also their shapes are also relatively straight and uniformly arranged radially.

Nevertheless, looking at the second drawing of FIG. 8 , it can be seen that the shape of the barb portion 12 is not perfectly symmetrical.

In this case, as shown in FIG. 4, when the barb insertion groove 31 into which the barb 12 of the filament is inserted is formed on the surface of the elongating roller 3, the shape of the barb 12 can be made uniform. .

1: extruder 2: cooling water tank
3: elongation roller 31: barb insertion groove
4: Oven 5: Bobbin
10: thread 11: core part
12: barb 100: nozzle
110: support member 120: head
121: seating groove 122: filtrate storage groove
130: radiation hole 131: core forming part
132: barb forming part

Claims (5)

In the manufacturing method of the medical thread,
The biodegradable polymer is supplied in a molten state into the nozzle 100 of the extruder 1 having the nozzle 100 having the radiation hole 130 formed at the end thereof, and the biodegradable polymer is melted into the end of the radiation hole 130. While extruding, the radiation hole 130 is formed with a core forming portion 131 having a circular cross-sectional shape, and a barb forming portion communicating with the core forming portion 131 and radially protruding outward of the core forming portion 131 ( 132) so that the extruded filament forms a core portion 11 having a circular cross-sectional shape and a barb portion 12 protruding radially outward from the core portion 11, but the core forming portion 131 The inner diameter of (a), the width (b) of the point where the barb forming part 132 and the core forming part 131 meet, the length from the end of the core forming part 131 to the end of the barb forming part 132 (c) ) is 10: 6.1 ~ 6.9: a melt extrusion step to be made in a ratio of 4.1 ~ 6.7;
a cooling step of cooling the filament discharged from the nozzle 100 by passing it through a cooling water tank 2 in which cooling water is stored;
A drawing step of manufacturing a medical thread by heating and drawing the filament that has undergone the cooling step through an oven 4 and a drawing roller 3;
A method for producing a medical thread that is spun with a non-circular cross-section for the production of barbed sutures.
According to claim 1,
The thread 10 produced in the drawing step,
The diameter of the core part 11 is 0.3 to 0.35 times the diameter of the core forming part 131,
The diameter (d) of the core portion 11, the width (e) of the point where the barb portion 12 and the core portion 11 meet, from the end of the core portion 11 to the end of the barb portion 12 The length (f) is characterized in that it consists of a ratio of 10: 3.8 ~ 5.5: 3.5 ~ 4.0,
A method for producing a medical thread that is spun with a non-circular cross-section for the production of barbed sutures.
According to claim 1,
Characterized in that a barb insertion groove 31 into which the barb portion 12 of the filament is inserted is formed on the surface of the elongating roller 3 to maintain the shape of the barb portion 12.
A method for producing a medical thread that is spun with a non-circular cross-section for the production of barbed sutures.
According to claim 3,
A plurality of the oven 4 and the elongating roller 3 are continuously installed along the direction in which the filaments travel, so that the heating and elongation of the filaments proceed alternately and repeatedly,
Each of the elongating rollers 3 is characterized in that the width and depth of the barb insertion groove 31 gradually decrease along the traveling direction.
A method for producing a medical thread that is spun with a non-circular cross-section for the production of barbed sutures.
According to claim 3,
The barb insertion groove 31 is characterized in that both side walls are made in a rounded shape,
A method for producing a medical thread that is spun with a non-circular cross-section for the production of barbed sutures.

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