JPH0474020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a suture needle used for medical purposes and a method for processing the same.

<Prior art> Suture needles used for medical purposes include tapered suture needles with a sharp needle tip called a taper point type, and tapered suture needles with a sharp needle tip and a sharp cutting edge called a cutting edge type. There are polygonal suture needles. Furthermore, there are eye needles and eyeless needles depending on the manner in which the suture thread is attached to the suture needle. These suturing needles are selectively used depending on the nature of the site to be sutured in the living body.

The suture needle is required to have characteristics such as low penetration resistance and long-lasting sharpness. In particular, with cutting edge type suture needles, when suturing living tissue, the tissue is incised and the suture needle is inserted and sutured, so the sharpness of the needle tip and cutting edge is maintained. strongly requested.

In order to meet the above requirements, the cutting edge type suture needle cuts a cold-drawn austenitic stainless steel wire to a predetermined length, and also cuts the wire in the axial direction by mechanical means. The needle tip and cutting edge are formed by grinding.
Although the needle tip and cutting edge formed in this manner have a very sharp shape, the surface of the suture needle has minute irregularities due to grinding abrasive grains.

<Problems to be Solved by the Invention> When measuring the penetration resistance of a polyester sheet using a plurality of cutting edge type suture needles having the same specifications configured as described above, the measurement value of the penetration resistance differs depending on the suture needle. Variations may occur. When we investigated the cause of the above-mentioned variation, we found that
It has become clear that this is affected by the state of burrs attached to the tip or cutting edge of each suture needle.

That is, the amount, shape, etc. of burrs attached to the tip or cutting edge of a suture needle have an adverse effect on the penetrability. Further, the amount and shape of the burr differ slightly depending on the individual suture needles, and this causes variations in the measured value of the penetration resistance.

When a suture needle with a burr attached to the needle tip or cutting blade is used to pierce living tissue, a portion of the living tissue incised by the needle tip or cutting blade is removed and adheres to the burr. Since the needle tip or cutting edge with burrs is covered by the tissue, as the number of piercings increases, the piercing resistance increases and the sharpness is impaired.

In the conventional suture needle processing process, the material of the suture needle that has been formed into a predetermined shape is tempered for eyed needles, and then tempered and the thread attachment hole is annealed for eyeless needles. After that, a chemical polishing treatment is performed for the purpose of removing the oxide film generated during the tempering treatment or the tempering treatment and annealing treatment.

The chemical polishing treatment was performed under the following conditions. In other words, the polishing treatment for the suture needle material that has been tempered uses a 25% aqua regia solution set at approximately 97°C as the treatment solution, and the oxide film is removed by setting the treatment time to approximately 60 seconds. ing. Furthermore, in polishing the material that has been subjected to tempering and annealing, the oxide film is removed by using the treatment liquid and setting the treatment time to about 90 seconds.

As described above, in the conventional technology, what is required in the chemical polishing process is to remove the oxide film generated by the tempering process or the tempering process and the annealing process, and the cutting edge of the suture needle is There is no interest in cleaning up the burrs attached to the surface. For this reason, the reality is that there is no control at all as to whether or not the burrs attached to the cutting edge are removed in the chemical polishing process.

An object of the present invention is to provide a suture needle that removes burrs attached to the needle tip and cutting edge and has a sharp needle tip and cutting edge, and to perform polishing treatment depending on the state of the burr attached to the cutting edge. By changing the processing conditions, or by fixing the processing conditions in the polishing process and changing the mechanical grinding conditions according to the polishing thickness that can be removed under the processing conditions, burrs attached to the cutting edge can be removed. The purpose of the present invention is to provide a processing method that can reliably remove .

<Means for Solving the Problems> A suture needle according to the present invention for solving the above problems is a suture needle having a cutting blade for incising tissue, and the material of the suture needle is subjected to predetermined grinding conditions. The needle tip and the cutting edge are formed by grinding with a set mechanical grinding means, and the needle tip and cutting edge are formed by applying chemical polishing or electrolytic polishing to the material under predetermined processing conditions. It removes burrs attached to the cutting blade and has a sharp needle tip and cutting blade.

In addition, the processing method for suture needles is to process the suture needle material whose needle tip and cutting edge are formed by mechanical grinding in a chemical polishing process or an electrolytic polishing process depending on the state of burrs attached to the material. This method is characterized by processing by changing conditions.

In the above processing method, the processing conditions to be changed include the processing time, composition of the processing liquid, and processing temperature in the case of the chemical polishing process, and the processing time, processing temperature, and the like in the case of the electrolytic polishing process. It is preferable to set the liquid composition, processing temperature, and current density.

In addition, other methods of processing suture needles include setting processing conditions in advance for a chemical polishing process or an electrolytic polishing process,
The present invention is characterized in that the grinding conditions in the mechanical grinding process for forming the needle tip and cutting edge on the material of the suture needle are changed depending on the grinding thickness under the processing conditions.

In the processing method, it is preferable that the grinding conditions to be changed are set as a pressing force of the needle material against the grindstone.

<Function> According to the above-mentioned suture needle, the material of the suture needle is ground by a mechanical grinding means set to predetermined grinding conditions to form the needle tip and cutting edge, and the material is set to predetermined processing conditions. By applying chemical polishing treatment or electrolytic polishing treatment (hereinafter referred to as "polishing" or "polishing treatment"), burrs attached to the needle tip and cutting blade are removed and a sharp needle tip and cutting blade are formed. Therefore, it has good piercing properties, and the piercing properties are not impaired even if the number of piercings increases.

In the first processing method, when the needle tip and cutting blade are formed by mechanically grinding the material of the suture needle, burrs adhere to the needle tip or cutting blade. Although the condition of the burr varies depending on the grinding conditions such as the grinding means and the pressing force, the burr can be removed by changing the processing conditions in the polishing step according to the condition of the burr.

That is, if the burr attached to the material of the suture needle is large, or if the part where the burr is attached to the needle tip or cutting edge is large, the processing conditions in the polishing process, for example, in the case of chemical polishing treatment, The suture needle can be adjusted by changing the treatment time, treatment liquid composition, treatment temperature, and in the case of electrolytic polishing treatment, by changing the treatment time, treatment liquid composition, treatment temperature, current density, etc. singly or in combination. Burrs can be removed without adversely affecting the shape of the cutting edge.

In the second processing method, if processing conditions such as processing liquid concentration, processing temperature, and processing time in the polishing step are set in advance, the polishing thickness in the polishing step can be defined. Therefore, in the mechanical grinding process, if the burr attached to the needle tip or cutting edge formed on the material of the suture needle is formed to a thickness corresponding to the polishing thickness, the burr can be removed by the polishing process. It can be removed.

In other words, when mechanically grinding the suture needle material, by changing the pressing force against the grindstone according to the grinding thickness in the grinding process, the thickness of the burr attached to the needle tip or cutting edge can be determined and By polishing the material to which burrs are attached, the burrs can be removed.

<Example> Examples of the suturing needle and the method of processing the suturing needle according to the present invention will be described below with reference to the drawings.

Figure 1 is an explanatory diagram of the suture needle, Figures 2 A to C are explanatory diagrams of burrs attached to the suture needle, and Figures 3 A, B to 6 A, B are the needle tip and cutting blade of the suture needle. Enlarged explanatory diagram, Fig. 7 is an explanatory diagram of the puncture resistance measuring device, Fig. 8
The figure is an explanatory diagram of the main part of FIG. 7, and FIG. 9 is an explanatory diagram of the measurement results.

FIG. 1 shows a cutting edge type suture needle 1, in which a needle tip 1a is formed at the tip, and
The body portion 1b is formed into a polygonal shape (triangular in this embodiment), and a hole 1c for attaching a suture thread is formed at the base end. In the body portion 1b having a triangular shape, each ridgeline has a needle tip 1.
A cutting edge 1d is formed near point a, and a plane 1e is formed by connecting each ridgeline.

The suture needle 1 is processed based on a processing method described below, and the needle tip 1a and the cutting edge 1d are free from burrs and the cutting edge 1d is formed in a sharp state.

When suturing living tissue using the suture needle 1, the living tissue can be smoothly incised by the needle tip 1a and the cutting blade 1d, and the suture needle 1 can be inserted therethrough. Furthermore, when incising living tissue with the suture needle 1 and inserting the suture needle 1, the ridge line from the needle tip 1a to the cutting edge 1d of the suture needle 1 has no minute irregularities due to adhesion of burrs, and therefore the needle tip 1a , living tissue does not adhere to the cutting edge 1d. For this reason, the needle tip is always
a. Since the cutting edge 1d is exposed in a sharp state,
Even if the number of piercings increases, it is possible to maintain good piercing performance, and the cutting quality is not impaired.

Here, the manufacturing process of the suture needle 1 will be briefly explained.

First, an austenitic stainless steel wire having a predetermined diameter is drawn to a diameter equal to the diameter of a suture needle to be processed by cold drawing. The wire is cut into a predetermined length to obtain a raw material, and the raw material is ground by mechanical grinding means to obtain a needle tip 1a, a cutting edge 1d,
A plane 1e is formed.

Next, a hole 1c is formed at the base end using a processing means such as a drill, laser beam, or electron beam. After bending the material in which the needle tip 1a, cutting edge 1d, flat surface 1e, and hole 1c are formed into a predetermined shape as described above, it is polished to remove burrs attached to the needle tip 1a and cutting edge 1d. At the same time, fine irregularities generated on the plane 1e by mechanical grinding are also removed.

Then, the material from which burrs have been removed is subjected to a tempering treatment in an inert atmosphere to age the residual stress, and the vicinity of the hole 1c is annealed to obtain the suture needle 1. By performing the tempering treatment or the tempering treatment and annealing treatment in an inert atmosphere, no oxide film is formed on the surface of the material.

Burrs 2 are inevitably generated in the mechanical grinding process, and as shown in FIG. 2A and FIGS. 3A and B,
It adheres to the needle tip 1a and cutting edge 1d of the suture needle 1.

The burr 2 is attached to the suture needle 1 as shown in FIG. 2B.
It is connected to the ridge line of the burr 2 by the joint part 2a, and when removing the burr 2, the size of the joint part 2a becomes a problem. In particular, since the suture needle 1 has a very thin thickness of 60 μm to 1.40 mm, it is impossible to remove the burr 2 by mechanical polishing means. Further, even if the burr 2 can be removed by, for example, mechanical polishing means, it is impossible to prevent the generation of new burrs.

Therefore, in the first processing method according to the present invention, the burr 2 is removed by a polishing treatment such as chemical polishing or electrolytic polishing. In particular, suture needle 1
The burrs 2 are removed by changing the polishing conditions according to the state of adhesion of the burrs 2 to the polishing surface. In addition, in the second processing method according to the present invention, the polishing treatment conditions are set to certain conditions to define the thickness that can be removed by polishing, and the mechanical grinding conditions are changed to create the suture needle 1. The burr 2 attached to the suture needle 1 is removed by polishing the suture needle 1 after mechanical grinding by forming a bonding part 2a having a thickness equal to the polishing thickness on the burr 2 attached. It is.

That is, if a suture needle with burrs is polished without any conditions being applied, it is impossible to control the removal of burrs. For example, if the polishing time is short, the burr will not be removed and the product will remain attached to the suture needle, and if the polishing time is long, the burr will be removed but will remain on the suture needle. At the same time, the cutter blade is polished and loses its sharpness, resulting in a loss of sharpness.

In this embodiment, as shown in FIG. 2B, the position of the cutting edge 1d (indicated by a chain line) of the suture needle 1 to which the burr 2 is attached is assumed, and the thickness x of the joint portion 2a of the burr 2 is The thickness y of the removal layer in the polishing process is calculated by measuring the In other words, by changing the polishing time depending on the state of the burr 2 attached to the suture needle 1, the burr 2 can be effectively removed. ing.

For example, the angle α of the cutting edge 1d is 60 degrees, the thickness is 200 μm,
In the suture needle 1 having a length of 7 mm, the thickness x of the joint 2a was measured to be 8 μm. In this case, the thickness y of the removal layer is y=x/2,
It becomes 4μm.

In addition, the polishing treatment for the suture needle 1 made of austenite diameter stainless steel material is chemical polishing, and the polishing process is 25%
When polishing is performed using an aqua regia treatment solution and the temperature of the treatment solution is set at 97° C., the thickness that can be removed per minute is experimentally 12 μm. Therefore, the set time for removing a 4 μm thick removal layer is 20 seconds.

The above-mentioned time has a large difference compared to the polishing treatment time for removing the oxide film produced by the conventional tempering treatment or tempering treatment and annealing treatment.

As mentioned above, the state of the burr 2 attached to the suture needle 1 is determined by the thickness x of the joint part 2a of the burr 2 on the cutting edge 1d.
By measuring and setting polishing conditions that can remove the thickness of the removal layer y according to the thickness x, the burr 2 can be reliably removed and the sharpness of the cutting edge 1d can be maintained. becomes possible.

It is known that the thickness x of the joint portion 2a of the burr 2 changes depending on the roughness of the grindstone in the mechanical grinding process, the pressing force of the material against the grindstone, and the grinding conditions such as wet or dry grinding. Therefore, by appropriately selecting the grinding conditions according to the shape of the suture needle 1, it is possible to set the thickness x of the joint portion 2a to a value corresponding to the selection conditions.

That is, in this example, materials having dimensions of 200 μm in thickness and 7 mm in length were bonded by wet mechanical grinding using a grinding wheel with a roughness of No. 1500 and a pressing force of 100 gf per grindstone. The thickness of part 2a is x
A value of 8μm was obtained. By increasing the pressing force, it is possible to increase the value of the thickness x, and by decreasing the pressing force, it is possible to decrease the value of the thickness x.

Generally, it is difficult to set the thickness y of the removed layer to a desired value by chemical polishing or electrolytic polishing. Further, although it varies depending on the composition of the processing liquid, chemical polishing generally causes the processing liquid to deteriorate quickly, and the thickness that can be polished with one liquid is often small. For this reason as well, it is difficult to set the thickness y of the removal layer to a desired value.

The polishing mechanism in the polishing process is that first, crystal grains that are susceptible to dissolution reaction are selectively etched, and then crystal grains that are difficult to undergo dissolution reaction are etched. That is, the cycle in the chemical polishing process is selective etching - total etching - surface smoothing - deterioration of the processing solution. The polishing thickness can be set in the above cycle by smoothing-
While the treatment solution is deteriorating, for example, if 25% aqua regia is
Under the conditions set at 97°C, the polishing thickness in one treatment is in the range of 2.0 μm to 3.0 μm.

Therefore, if the thickness of the joint portion 2a of the burr 2 is 8 μm and the thickness y of the removal layer is 4 μm, the burr 2 can be removed by performing the polishing process twice. However, for example, if the thickness y of the removal layer is
If it is 3.5 μm, there is no way to treat it.
In such cases, by changing the aqua regia concentration of the treatment solution or by changing the ratio of nitric acid and hydrochloric acid, that is, by changing the treatment conditions, the removal layer can be removed in one polishing treatment. It is possible to remove the burr 2 whose thickness y is 3.5 μm.

In addition, when the thickness y of the removed layer is 3.5 μm as described above, by increasing the pressing force of the material against the grindstone, which is the mechanical grinding condition, and grinding so that the thickness y of the removed layer becomes 4 μm, By performing the polishing process twice, the burr 2 can be removed.

If the suture needle 1 has minute irregularities on the plane 1e due to mechanical grinding, the irregularities will cause the suture needle 1 to
This may cause resistance when passing through living tissue. Therefore, it is necessary to make the plane 1e smooth in order to reduce the piercing resistance.

The plane 1e is smoothed by polishing the needle tip 1.
a, This is done simultaneously with the removal of the burr 2 attached to the cutting edge 1d. When performing a polishing process, the processing liquid that is in contact with the convex portions of the plane 1e is active, and the process liquid that is in contact with the concave portions is inert, so that the amount of etching for the convex portions becomes large. , the plane 1e becomes smooth after a certain period of time. However, if the polishing process is finished before the plane 1e is smoothed, many parts that are easily dissolved will have reacted.
The plane 1e has a matte finish. Therefore, when flat surface 1e is required to be smooth, such as in the case of a suture needle, the difference in the height of unevenness occurring on the surface 1e, that is, the surface roughness, is set to be equal to or less than the thickness y of the removal layer. It is necessary to set the grinding conditions so that the value of .

That is, when the thickness x of the bonding part 2a is minute and the thickness y of the removal layer is smaller than the roughness on the plane 1e, the polishing time required to remove the removal layer is short and the roughness that occurs on the plane 1e is small. In some cases, unevenness cannot be smoothed out. In the case of the suture needle 1 having irregularities on the plane 1e, the slipperiness of the plane 1e is poor, increasing the penetration resistance, and there is no luster.
There is a risk that the product value will decrease.

As mentioned above, when the thickness y of the removed layer is smaller than the surface roughness, the value of the thickness x of the joint portion 2a can be increased by increasing the pressing force of the material against the grindstone in the mechanical grinding process. By doing so, by increasing the value of the thickness y of the removal layer, that is, by increasing the polishing thickness, it is possible to lengthen the polishing time and remove the removal layer and smooth the plane 1e. Become.

As described above, according to the first processing method according to the present invention, the polishing time in the polishing process or the polishing of the treatment liquid etc. By changing the conditions, it is possible to remove the burr 2, and according to the second processing method, by keeping the polishing conditions constant, the polishing thickness in the polishing process can be changed. By specifying this and changing the grinding conditions in the grinding process, it becomes possible to form the burr 2 according to the polishing thickness and to remove the burr 2 by the polishing process.

The material from which the burrs 2 attached to the needle tip 1a and the cutting edge 1d have been removed as described above is heated to approximately 350°C in an inert gas atmosphere such as nitrogen gas or argon gas, or an inert atmosphere such as vacuum. Heat and temper. In addition, when performing annealing treatment, concentrate on the hole 1c formed in the material.
Annealing treatment is performed by heating to 850°C.
Since each of the heat treatments is performed in an inert gas atmosphere, the suture needle 1 is made of a material that has been tempered or tempered and annealed without forming an oxide film on the surface of the material.
It becomes possible to configure.

[Experiment example]

Next, a material having dimensions of 200 μm in thickness and 7 mm in length was wet mechanically ground using a grinding wheel with a roughness of No. 1500 at a pressing force of 100 gf. Figures 3A and B show the removal status of burr 2 according to the chemical polishing treatment time for 1.
This will be explained using FIGS. 6A and 6B, and the measurement results of the penetration resistance value of the suture needle shown in each figure will be explained.

Each figure A in FIGS. 3 to 6 is an explanatory view of the needle tip 1a and the cutting edge 1d of the suture needle 1 enlarged 86 times, and each figure B shows a part of the needle tip 1a and the cutting edge 1d. of
It is an explanatory diagram enlarged 860 times.

FIG. 3 shows the state of the suture needle 1 immediately after grinding, and as shown in FIG. 3A and B, the burr 2 is attached substantially continuously to the ridge. Further, the cross-sectional shape in the above state is shown by the thin line in FIG. 2C.

FIG. 4 shows the suture needle 1 after being polished for 10 seconds. In Figure A, it is difficult to see the burr 2 attached to the ridgeline, but as shown in Figure B, the burr 2 attached to the needle tip 1a has not been completely removed. The cross-sectional shape in the above state is shown by the dashed line in FIG. 2C.

FIG. 5 shows a state in which the suture needle 1 has been polished for an additional 10 seconds, ie, a total of 20 seconds. As shown in FIGS. A and B, the burr 2 attached to the ridgeline is completely removed, and the sharpness of the cutting edge 1d is maintained. The cross-sectional shape in the above state is shown by the solid line in FIG. 2C.

FIG. 6 shows a state in which the suture needle 1 has been polished for an additional 20 seconds, ie, a total of 40 seconds. As shown in FIGS. A and B, the burr 2 attached to the ridgeline has been completely removed, but the sharpness of the cutting edge 1d has begun to deteriorate. The cross-sectional shape in the above state is shown by the two-dot chain line in FIG. 2C.

Next, the suture needle 1 in the state shown in FIG. 3 above, and the piercing resistance value after the suture needle 1 was polished for a certain period of time, were constructed as shown in FIGS. 7 and 8. The measurement results measured by the measuring device will be explained.

First, the schematic configuration of the measuring device will be explained. In the figure, a ball screw 11 is installed upright and is driven by a servo motor (not shown).
is provided. A crosshead 12 is engaged with the ball screw 11. Said crosshead 1
A load cell 13 connected to a pen recorder 13a is provided at the center of the load cell 1.
The suture needle 2 is fixed to a vise 14 attached to the holder 3. A circular hole 15 facing the suture needle 2
A document stand 15 is provided. The document table 15 is rotated by a pulse motor 16 at predetermined division angles. Further, a polyester sheet 17 for measuring piercing resistance is attached to the data table 15.

In the measuring device configured as described above, the needle tip 1a of the suture needle 1 is placed at a position a certain distance away from the circumference of the circular hole 15a formed in the data table 15. Also polyester sheet 17
The thickness of the suture needle 1 is set to 20 μm, and the penetration distance of the suture needle 1 is set to 2 mm.

The suture needle 1 shown in FIG. 3, which had been ground under the above-mentioned grinding conditions, was polished for 60 seconds at 10-second intervals, and the penetration resistance value was measured after each treatment time. The results shown in the figure were obtained. As shown in the figure, the piercing resistance of the suture needle 1 after being polished for about 20 seconds is the smallest value, and thereafter the piercing resistance value gradually increases.

From the above, the burr 2 attached to the suture needle 1
can be removed by polishing for about 20 seconds, but it can be said that polishing for longer than this time impairs the sharpness of the cutting edge 1d.

Therefore, depending on the state of the burr 2 attached to the suture needle 1, it is possible to set optimal polishing conditions for removing the burr 2. Further, by giving the range of permissible penetration resistance to the suture needle 1, it is possible to set appropriate polishing conditions. That is, for example, when the penetration resistance value of the suture needle 1 is set to a range of 15 gf or less, as is clear from the figure,
The polishing time can be set between approximately 13 seconds and 40 seconds.

In addition, from the above measurement results, in the conventional technology, polishing treatment is performed to remove the oxide film generated by tempering treatment or tempering treatment and annealing treatment, but this treatment time is not sufficient to remove the temper color. It takes about 60 seconds to remove the oxide film from the temper color and annealing treatment, and it takes about 90 seconds to remove the oxide film by temper coloring and annealing. Therefore, suture needles processed using the conventional technology do not have burrs attached, but the cutting edge does not. It turns out that the sharpness is lost.

Next, burr removal by electrolytic polishing treatment will be explained.

Thickness of needle tip and cutting edge formed by mechanical grinding
80 triangular needles (not shown) with a length of 0.6 mm and a length of 31 mm were immersed in an electrolytic treatment solution with a composition of 89% phosphoric acid and the balance sulfuric acid, set at room temperature, and energized for 30 seconds at a bath voltage of 10 volts. As a result, it was possible to completely remove the burrs attached to the cutting edge and maintain the sharpness of the cutting edge.

The current density in the treatment was 6 A/dm ² .

In the electrolytic polishing process described above, in order to control the thickness of the removal layer, the process conditions such as changing the process time, changing the composition of the process solution, changing the process temperature, changing the current density, etc. can be changed either alone or It can be implemented by combining them.

<Effects of the Invention> As explained in detail above, the suture needle according to the present invention reliably removes burrs attached to the needle tip and cutting edge, and maintains the sharpness of the cutting edge.
It has good piercing properties, and the piercing resistance does not increase even if the number of piercings increases.

Further, the first processing method according to the present invention reliably removes burrs attached to the suture needle by changing processing conditions in the polishing step depending on the state of the burr attached to the suture needle. , the sharpness of the needle tip and cutting edge can be maintained.

In the second processing method, the processing conditions for the polishing process are set in advance, the polishing thickness is defined in the polishing process, and the grinding conditions in the mechanical grinding process are changed. Alternatively, it is possible to specify the thickness of the burr attached to the cutting edge and to remove the burr by polishing the material with the burr attached.

For this reason, it has features such as being able to mass-produce suture needles of stable quality that have a certain level of penetration and sharpness.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the suture needle, Figures 2 A to C are explanatory diagrams of burrs attached to the suture needle, and Figures 3 A, B to 6 A, B are the needle tip and cutting blade of the suture needle. Enlarged explanatory diagram, Fig. 7 is an explanatory diagram of the puncture resistance measuring device, Fig. 8
The figure is an explanatory diagram of the main part of FIG. 7, and FIG. 9 is an explanatory diagram of the measurement results. 1 is a suture needle, 1a is a needle tip, 1b is a body, 1c is a hole, 1d is a cutting edge, 2 is a burr, and 2a is a connecting portion.

Claims (1)

[Claims] 1. Detection of the thickness of the connecting portion of the burr generated by connecting the needle tip and the cutting edge in the suture needle material whose needle tip and cutting edge are formed by mechanical grinding. Then, the processing conditions in the chemical polishing process or electrolytic polishing process are set to conditions that can remove the thickness of the detected connection part, and then the material of the suture needle where the burr has been generated is subjected to chemical polishing process or electrolytic polishing process. A suture needle processing method characterized by removing burrs through processing. 2. A claim characterized in that when the polishing process is a chemical polishing process, the processing conditions to be set are the processing time, the composition of the processing liquid, and the processing temperature, and the processing conditions are set singly or in combination. Item 1
Processing method of suture needle described. 3. When the polishing process is an electrolytic polishing process, the processing conditions to be set are processing time, composition of processing liquid, processing temperature, and current density, and the processing conditions are set singly or in combination. The method for processing a suture needle according to claim 1. 4 Setting the processing conditions for the chemical polishing process or electrolytic polishing process in advance to set the thickness of the material that can be removed in the polishing process, and grinding the material of the suture needle to form the needle tip and cutting edge. At this time, the pressing force of the suture needle material against the abrasive material is maintained at a preset value to generate connecting burrs on the needle tip and cutting edge with a thickness that can be removed in the polishing step, and then, A method for processing a suture needle, characterized in that burrs are removed by subjecting the material of the suture needle to chemical polishing or electrolytic polishing.