JP2001128983A - Suture needle and manufacturing method of suture needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suture needle used in suturing a lesion which is improved in strength to bending and reduced in piercing resistance. SOLUTION: The suture needle A of this invention is a curved needle having a needle tip part 1 piercing biotissue, a base end part 4 to which a suture thread is fitted, and a body part 3 formed between the needle tip part 1 and the base end part 4, which is characterized in that at least the body part is formed by a pair of flat surfaces 6 opposite to each other and a pair of grooves 5 opposite to each other in the direction of intersecting the opposite direction of the paired flat surfaces 6, the paired grooves 5 are formed by a curved surface without edges, a joint part 7 between the flat surface 6 and the groove 5 is formed by a curve surface, and the paired grooves 5 form the side surface of the needle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical suture needle having improved bending strength and reduced piercing resistance.

[0002]

2. Description of the Related Art In general, a medical suture needle is operated by a doctor grasping with a needle holder, and has a function of penetrating an affected part and passing a suture through the affected part. In addition, many types of medical suturing needles having different shapes and dimensions are provided, and an optimal one is selected from these and used according to an affected part to be sutured.

[0003] In a medical suture needle, a sharp needle tip is formed at the tip, a needle tip is formed at a predetermined length from the needle tip, and a torso and a base end are sequentially connected to the needle tip. It is formed. The needle tip gradually increases in thickness from a sharp needle tip to a torso, and has a cross-sectional shape unique to each medical suture needle. For example, a needle tip has a polygonal cross-sectional shape, and a cutting edge is formed on a plurality of edges constituting the polygon, and a needle having a circular cross-sectional shape and no cutting edge is also available. A medical suture needle having a cutting blade has a function of cutting through a tissue penetrated by the needle tip, and a medical suture needle having no cutting blade has a function of pushing out the tissue penetrated by the needle tip.

The body has a shape in which the cross section of the needle tip is extended, or a round cross section irrespective of the cross section of the needle tip, and has a substantially constant cross-sectional area. In particular, even with a medical suture needle having a cutting edge formed at the needle tip, no cutting edge is formed at the body. The base end is a portion to which a suture is attached, and has a hole formed by a pair of pillars having a spring property and a blind hole formed in the base end face.

A specific example of the medical suture needle will be described. For example, a medical suture needle disclosed in Japanese Patent Application Laid-Open No. 63-257539 relates to a spatula-shaped suture needle 51 configured for ophthalmology as shown in FIG. In this spatula-shaped suture needle 51, the needle tip portion 51a has a cross section partially formed from a triangle shown in FIG. 3 (c) to a quadrangle shown in FIG. 3 (d), and a surface 52 constituting each side is formed as a concave surface. Each ridge line 53 is formed at an acute angle by the intersection of the concave surfaces. In particular, in a portion corresponding to the trunk portion 51b shown in FIG. 3E, each ridge line 53 has a cutting edge or a sharp angle corresponding to the cutting edge. In the spatula-shaped suture needle 51, a portion that damages the tissue by passing the sharp ridge line 53 of the body portion 51b along the portion cut by the blade of the needle tip 51a in the tissue is limited, and the concave surface 52 The piercing resistance is reduced by reducing the contact with the tissue.

As shown in FIG. 7, a medical suture needle 61 disclosed in Japanese Utility Model Laid-Open Publication No. 56-61212 has several projections 62 and depressions extending from a needle tip 61a to a needle body 61b. 63 are provided alternately. According to this technique, the stitches can be stably performed by gripping the concave and convex portions 62 and 63 in accordance with the concave and convex portions provided on the needle holder (not shown).

[0007]

When suturing an affected part with each of the medical suturing needles described above, a cantilever having a holding part by a needle holder as a supporting part and a needle point as a load point is grasped by a needle holder. There is a possibility that large bending occurs in the portion, which may hinder the suturing operation. However, the above-mentioned medical suture needles do not solve such a problem, and therefore, the idea of reducing the bending is not disclosed.

[0008] In order to suppress the bending generated at the time of suturing,
It is necessary to improve the strength of the material. However, when the strength of the material is improved, a problem arises that the brittleness increases and the material is easily broken at the time of suturing.

[0009] It is an object of the present invention to provide a medical suture needle having improved bending strength without impairing ductility (repeated bending strength) and further reducing piercing resistance.

[0010]

In order to solve the above problems, a medical suture needle according to the present invention comprises a needle tip for penetrating a living tissue, a base end for attaching a suture, and Having a body formed between the needle tip and the base end,
At least the body portion is composed of a pair of flat surfaces facing each other and a pair of grooves facing each other in a direction intersecting with the facing direction of the pair of flat surfaces, and each of the pair of grooves has an edge. The curved needle is formed by a curved surface that is not formed, and a joint between the flat surface and the groove is also formed by a curved surface, and the pair of grooves is a side surface.

In the above-mentioned suturing needle, the cross-sectional shape from the trunk or from the trunk to the needle tip is formed by combining a pair of opposing surfaces and a concave groove in a direction intersecting the surfaces. Therefore, by appropriately setting the width dimension of the pair of surfaces and the distance between the pair of surfaces, the second moment of area can be increased, and the strength against bending can be improved. Therefore, when the affected part is sutured by grasping the pair of surfaces with a needle holder, the generated flexure is reduced, and the suturing sensation of the doctor is not disturbed.

Further, in the above-mentioned suture needle, a pair of opposing surfaces and the groove are connected by a curved surface having a radius within a preset range. Therefore, when suturing an affected part, the tissue extends from the pair of surfaces to the curved surface. Although they make contact, the bottom of the groove does not. For this reason, the contact area between the two is reduced, and the piercing resistance can be reduced. Further, if the pair of grooves is formed by a curved surface having no edge, the cross-sectional profile of the trunk does not have an edge, and a place where stress concentrates when the suture needle is bent is formed. It is possible to provide a suture needle that is hard to be formed and hard to break.

In the case where the suturing needle is a curved needle in which the pair of grooves are side surfaces, the suturing needle is a curved needle of the same kind that the user works by making snap work, and the effect of the above-described second moment of area is provided. Can be utilized. Furthermore, the width B of the cross section of the trunk portion with respect to the bending direction of the suture needle
The relationship between the height and the height H is greater when B / H <1, and when 0.7 <B / H, the stability when held by a needle holder is increased. Can be done.

Further, as a method of manufacturing the above-mentioned medical suture needle, a press-type die having upper and lower pieces opposing each other and right and left pieces opposing each other is used, and a rod-shaped intermediate material is used. When forming a medical suture needle having a pair of flat surfaces and a pair of grooves in cross section, sandwiching the upper, lower, right, and left pieces, adjacent pieces face each other in the pressing direction. It can also depend on the manufacturing method in contact.

According to this manufacturing method, when the intermediate material is pressed, the pressing force is balanced because the adjacent pieces come into contact with each other, so that a stable pressing can always be performed.

Further, by using a piece in which two adjacent pieces of the upper piece, the lower piece, the left piece, and the right piece are integrated,
The above manufacturing method can also be performed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the above-described suture needle will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a suturing needle. FIG. 2 is a view for explaining a cross-sectional shape of the trunk, and is a cross-sectional view taken along line II-II of FIG. FIG. 3 is an explanatory view of a mold for press-working the suture needle.

A suture needle A shown in FIGS. 1 and 2 penetrates a tissue with a sharp needle tip 1 and then has a needle tip 2 following the needle tip 1.
The puncture site is pushed and spread, and further, the tissue is pushed and spread, and the suture thread (not shown) attached to the base end 4 is passed by passing through the trunk 3 and the base end 4. is there. Thus, the suture needle A is mainly used for suturing a blood vessel because the tissue is not torn.

In particular, the suture needle A is provided with the trunk 3 or the needle tip 2.
A concave groove 5 is formed on both side surfaces from the to the body 3, and by forming the groove 5, the body 3 has the same cross-sectional area as the original circle. The second moment is greatly increased. Suture needle A
It is formed as a curved needle that has a predetermined radius of curvature and bend angle from the needle tip 1 to the base end 4.

However, the suturing needle according to the present invention
(The cross section of the needle tip 2 is not limited to a circle.) The present invention can be applied to a suturing needle having another cross section. That is, even with a suture needle having a cutting edge formed at the needle tip, the trunk can be formed in the same shape as that of the present embodiment regardless of the cross-sectional shape of the needle tip. Further, the needle need not always be a curved needle, and can be applied to a linear suture needle.

Generally, the thickness of the suturing needle is in the range of 0.025 mm to 1.40 mm, and a doctor selects and uses a suturing needle having such a thickness in accordance with a site to be sewn. Therefore,
For example, a suture needle A for suturing a blood vessel as in the present embodiment.
However, various suture needles A having different thicknesses corresponding to the thickness and thickness of the blood vessel to be sutured, and having different radii of curvature and different bending angles are employed.

The needle tip 2 is formed in a conical taper from the needle tip 1 to the torso 3 and has a function of expanding the tissue penetrated by the needle tip 1 without cutting the tip, and has a sharp needle tip provided at the tip. From 1 to a circular cross section, or from the vicinity of the trunk 3 to the trunk, it has a drum shape to be described later, and the cross-sectional area increases as the distance from the needle tip 1 increases.

The torso 3 is a part that is stably gripped by a needle holder (not shown) when suturing the affected part, and has a cross-sectional shape projecting right and left at the upper part as shown in FIG. , Again forming a drum shape that extends left and right at the bottom. And, in such a trunk, the cross-sectional area is maintained at a substantially constant value even when the distance from the needle tip 1 changes.

The original end 4 is a part having a function of attaching a suture (not shown). After inserting the end of the suture into a blind hole formed at a predetermined depth from the end face side, the periphery of the blind hole is removed. It is also possible to attach the sutures or to project a pair of spring-loaded holes and attach the suture with hook-shaped retaining pieces formed at opposing portions of the holes. In the present embodiment, the suture needle A is
Is formed as a so-called eyeless needle having a blind hole 4a formed in the end face of the eyeless needle.

Next, the sectional shape of the body 3 will be specifically described. The body 3 has a pair of flat surfaces 6 formed on opposite sides of the inner and outer diameter sides of the curve, and has opposite sides formed with concave sides toward the center of the body 3 on both sides of the curve. Formed as a pair of concave grooves 5. The connecting portion 7 between the flat surface 6 and the groove 5 is formed by a curved surface having a radius of curvature in the range of 10% to 25% of the diameter of the thickest portion of the suture needle A. And the groove 5 having a concave surface is smoothly connected to form a whole (a drum shape) similar to a small drum.

Since the opposing surfaces are formed as flat surfaces 6, the needle holder can hold the needle in a stable state.

The connecting portion 7 between the flat surface 6 and the groove 5 does not necessarily have to be a curved surface, but may be formed in a polygonal shape with many straight lines. Even in this case, the apparent radius of curvature of the polygonal shape is preferably in the range of 10% to 25% of the diameter of the thickest part of the suture needle A.

In the above-mentioned drum-shaped cross section of the torso 3, the cross-sectional area does not change over the entire length of the torso 3 and is substantially equal to the value of the cross-sectional area of the material constituting the suturing needle A. The ratio of the width dimension B of the flat surface 6 to the distance (height dimension) H between the flat surfaces 6 is not particularly limited, but B / H is preferably 1 or less. By setting the ratio to 1 or less, it is possible to increase the second moment of area.
Similarly, B / H is desirably 0.7 or more. If the value is smaller than this value, the needle holder will lack stability when gripped.

Therefore, when the cross section of the material used to construct the suturing needle A is circular, the width B of the flat surface 6 is smaller than the diameter of the circle, and the height H is larger than the diameter of the circle. You have set. In particular, when forming the drum shape of the trunk 3,
It is preferable to employ plastic working without excluding the material, that is, regardless of cutting work. As described above, by forming the body portion 3 by plastic working, it is possible to form a reasonable cross-sectional shape by effectively using the material.

When the groove 5 is formed by plastic working, increasing the depth of the groove 5 increases the working rate, and can increase the hardness of the material. But,
Increasing the hardness of the material impairs flexibility and means that the material is easily broken. Therefore, the depth of the groove 5 is limited, and cannot be increased without limit. The shape of the groove 5 is V-shaped with a gentle bottom.
Although the shape of a circular arc may be used, the radius of curvature in the case of the circular arc is preferably about 15% to 45% of the diameter of the thickest part of the suture needle A.

For example, in this embodiment, the diameter of the thickest part is 0.45 mm, the width B of the flat surface 6 is 0.381 mm,
The height H is set to 0.470 mm, and the radius of curvature of the groove 5 is set to 0.150 mm. The groove 5 having the radius of curvature and the flat surface 6 were formed as test pieces by forming connecting portions 7 by curved surfaces having various radii of curvature, and a piercing test and a bending test were performed.

As a result of the above-mentioned various tests, the radius of curvature of the connecting portion 7 is determined to be the thickest portion of the suture needle A (the trunk portion 3 and the original end portion 4).
The preferred result is obtained in the range of 10% to 25% of the thickness of the connection portion (and the vicinity thereof). That is, when the radius of curvature of the connecting portion 7 is smaller than the above range, when the connecting portion 7 is sharpened and bent, the deformation is concentrated and easily broken. When the radius of curvature is larger than the above range, the dimension of the groove 5 is small. As a result, the contact with the tissue increases, and it becomes difficult to reduce the penetration resistance.

Here, the thickest portion is, in the case of a suturing needle having a blind hole in the original end face, the connecting portion between the trunk and the original end and in the vicinity thereof, and has a pair of holes at the original end. For the needle, it is near the center of the torso. By configuring the suture needle in this way, the pair of opposing surfaces and the groove are connected by a curved surface having a radius within a preset range, so that when suturing the affected part, the tissue is separated from the pair of surfaces. Although it contacts over the curved surface, the bottom of the groove does not. For this reason,
The contact area between the two is reduced, and the piercing resistance can be reduced.

With the suture needle A, the tissue does not come into contact with the groove 5 formed in the trunk 3 when the affected part is pierced.
The piercing resistance has been reduced. For example, when compared with a conventional torso having a round cross section and the same thickness, the puncture resistance of the conventional suturing needle was 110 g, whereas the suturing needle A of the present embodiment weighed 100 g. Was. This value indicates that it is difficult to reduce the piercing resistance, and the piercing resistance has been sufficiently reduced as a suture needle having a shape that does not cut the tissue.

As a result of a bending test using the suturing needle A of the present embodiment, the strength is improved by about 1.4 times as compared with a conventional body having a round cross-section and a thickest portion having the same thickness. It was possible. In addition, as a result of a 90-degree bending test in which the body is repeatedly bent in the direction of the outer diameter and bent at 90 degrees, the same number of bending times (three times) as compared with the case where the cross section of the body is round and the thickness of the thickest part is the same. It was possible to endure.

This means that the bending strength has been improved in spite of having the same ductility (repetitive bending strength) as the conventional round needle.

In particular, when the behavior during the 90-degree bending test was observed, as the body 3 was gripped by the vice and bent, the deformation of the flat surface 6 inside the bending caused the deformation of the body 3.
And the deformation of the flat surface 6 was concentrated in the groove 5 outside the bend. Therefore, it is considered that ductility has been improved. For example, when a 90-degree bending test was performed on a suture needle having a rectangular cross section in which the width B of the flat surface and the distance H between the flat surfaces were the same as in the present example, it was broken by two bends. . From this, it can be said that it is necessary to have one flat surface 6 and a pair of concave grooves 5 facing each other, and to connect them by the connecting portion 7 having a curved surface.

FIG. 3 shows a suture needle B having another example of the cross-sectional shape.
(A cross section viewed from the base end 4 toward the needle tip 1).
As shown in the figure, the trunk 13 has a pair of grooves 15, 15 formed on both sides similarly to the trunk 3 described above, and a pair of flat surfaces 16, 16 formed on the top and bottom surfaces. It has a drum-shaped cross section. Of the connecting portions 17, the connecting portion 17A located diagonally and located at the lower left and upper right in the figure has a larger curved diameter, and the connecting portion 17B located at the upper left and lower right has a smaller curved diameter. That is, the joints 17B, 17B of each other
The distance L2 between them is substantially longer than the distance L1 between the joints 17A, 17A, and the bending strength between the joints 17B, 17B is larger than that between the joints 17A, 17A. I have.

The suturing needle B having the body 13 having such a structure
When the operator holds the needle holder in his right hand and operates the needle holder, the curved diameter of the joint 17B on the front side and the joint 17B on the lower side facing the operator becomes small. Normally, the surgeon passes the suture needle B toward the front, and tilts the body 13 so as to be scooped up from the lower side on the front side, which is the diagonal thereof, as an axis.
A large force will be applied in this diagonal direction. For this reason, the diameter of the joint 17B on the front side and the joint 17B on the lower side are reduced, the diagonal distance L2 between them is increased, and the bending strength is increased. It becomes a needle.

On the other hand, in order to obtain a medical suture needle having a large bending strength for the left hand, the joints 17A and 17
What is necessary is just to make the distance between A relatively larger than the distance between the other joining parts 17B and 17B. Also, even with a medical suture needle for the right hand, if a soft suture needle is desired,
Similarly, a suture needle may be provided in which the distance between the joints 17A, 17A is larger than the distance between the joints 17B, 17B.

In the above-described suturing needles A and B, the upper and lower surfaces of the body portions 3 and 13 are formed as flat surfaces 6 and 16, but the shapes of the upper and lower surfaces are not necessarily limited thereto. Instead, the top and bottom surfaces may be concave, or irregularities may be formed so that the needle holder can be easily gripped. In particular, in the configuration of the suturing needle B, the shape of the top surface and the bottom surface is a flat surface 1 as long as the configuration in which the bending strength at one diagonal is different from the bending strength at the other diagonal is achieved.
It is not limited to 6,16.

Next, a process for manufacturing the suture needle A will be described. Since the suture needle A penetrates the tissue and sutures the affected part, it is necessary that the suture needle A has sufficient hardness and does not generate rust or corrosion. For this reason, in the present embodiment, austenitic stainless steel is used as a material, and a wire having a diameter set in advance in consideration of a working rate is reduced in diameter by cold drawing to obtain a desired diameter of the suture needle A. Processing.

In the wire obtained as described above, the austenite structure of the material is elongated in a fiber shape, and has high hardness due to work hardening and high flexibility due to the fiber structure. In particular, since the material is austenitic stainless steel, it has high corrosion resistance, does not generate rust, and can be hard and highly flexible.

The above-mentioned material is cut into a desired length of the suturing needle A to process a linear intermediate material P, and one end of the intermediate material P is polished to form a needle tip 1 and a conical shape. A tapered needle tip 2 is formed.

FIG. 4 shows the pressing process of the cold drawing intermediate material P.
Shown in In this press step, a press die 30 divided into four parts is used as shown in FIG. The upper piece 30A, the lower piece 30B, the left piece 30C, and the right piece 30D constituting the press die 30 each have a substantially triangular tip in cross section, and two sides 30 constituting the same triangular tip.
a, 30b have a shape that intersects at 90 degrees.

A flat portion 30X is formed at the tip of the upper piece 30A and the lower piece 30B, and the tip of the left piece 30C and the right piece 30D is an arc-shaped overhang.
30Y is formed. And these four pieces 30A ~
When D is assembled, the adjacent sides 30a and 30b of each mold are joined to form a space S in the center where the upper and lower surfaces are flat and both side surfaces are depressed (see FIG. 3B).

Of the pieces 30, first, the intermediate material P is vertically held between the flat portions 30X and 30X using the upper piece 30A and the lower piece 30B, and is held so as not to move. Then, by moving the left piece 30C and the right piece 30D from left and right, the respective arc-shaped overhangs 30Y and 30Y press the intermediate material P from left and right, thereby deforming the cross-sectional shape of the intermediate material P. The intermediate material P is deformed along the shape of the space S, and a suture needle having flat surfaces 6 on upper and lower surfaces and grooves 5 on left and right side surfaces is formed.

Since the press die 30 is formed by using the pieces 30A to 30D having such a shape, when the pieces 30A to 30D are clamped, the force applied from all sides is adjacent to the pieces 30A to 30D. The sides 30a and 30b are balanced with each other, and the pressing force of the overhang portions 30Y and 30Y is always constant. For this reason, an excessive force is not applied to the intermediate material P, and the intermediate material P can always be stably deformed.

Following the above-mentioned processing or prior to the above-mentioned processing, a base end 4 is formed at the other end of the material. That is, the other end face is irradiated with laser light to melt the material,
Evaporate to form a blind hole 4a, or form a blind hole 4a by drilling in the end face, so that the original end 4
To form

After forming the needle tip 1, the needle tip 2, the trunk 3, the base end 4, the groove 5, the flat surface 6, and the connecting portion 7 as described above, the flat surface 6 is formed into a curved inner diameter. The suturing needle A is manufactured by bending and forming the suturing needle A at the side and the outer diameter side and bending the suturing needle A with a curvature radius and an angle.

In the suture needle A, the tissue from the needle tip 1 to the torso 3 is an austenite structure elongated in a fiber shape, and has extremely high hardness and flexibility. For this reason, it is possible to very easily penetrate the tissue when suturing the affected part.

In the above embodiment, the medical suturing needle of the present invention is described as a curved needle. However, as described above, the grooves 5 are formed on both side surfaces, and the flat surfaces 6 are formed on the upper and lower surfaces. Since the medical suture needle A has an effect of reducing the contact area with the living tissue and reducing the piercing resistance, the suture needle can provide a predetermined effect even when applied to a straight needle that does not bend.

In the above-described embodiment, the medical suture needle has been described as having the upper and lower surfaces flat, but the medical suture needle of the present invention is not limited to this. And the like. The groove 5 may have various shapes such as a V-shaped groove and a U-shaped groove, but a high ductility is obtained by forming a groove having no edge as shown in this embodiment. be able to.

Further, in the above embodiment, the groove 5 is
And formed over the needle tip 2, but may be formed only on the trunk 3.

Next, another embodiment of the method for manufacturing a medical suture needle according to the present invention will be described with reference to FIG. The suturing needle B in the present embodiment is formed of the same material as the suturing needle A in the embodiment as described above.
13 is a change in the cross-sectional shape (see FIG. 3).

First, processing is performed in the same manner as in the above-described embodiment, and one end is polished to obtain a needle tip 1 and a needle tip 2 having a conical taper.
The intermediate material P on which is formed is manufactured.

Next, a pressing step of the cold drawn intermediate material P shown in FIG. 5 is performed. In this press step, as shown in FIG. 3A, the press die 30 is replaced with a right upper piece 40A and a lower left piece 40B.
A press die 40 consisting of two pieces is used.

The upper right piece 40A and the lower left piece 40B are formed with a flat portion 40X and an arc-shaped overhang portion 40Y, respectively. Then, when these two upper right pieces 40A and lower left pieces 40B are assembled, the adjacent side 40a of each type and the flat portion 40X are joined to form a space S in the center where the upper and lower surfaces are flat and both side surfaces are depressed. (See FIG. 5B).

In this press step, first, the upper right piece 40A
And the lower left piece 40B approach the center of the intermediate material P from the upper right direction and the lower left direction, respectively, and press it. At this time, the flat portion 40X of the upper right piece 40A and the flat portion 40X of the lower left piece 40B
X forms flat surfaces 16, 16 on the top and bottom surfaces of the intermediate material P, while the respective arc-shaped overhangs 40Y, 40Y press the intermediate material P on the left and right sides to form grooves. Form 15,15.

At this time, with the movement of the upper right piece 40A and the lower left piece 40B, the intermediate material P is crushed, and the material of the intermediate material P is pushed out to the four unpressed corners. In the overhang portion 40Y of the upper right piece 40A, since the upper diameter is large and the lower diameter is small, the curved diameter of the lower right connecting portion 17A formed by the smaller gap becomes smaller. Similarly, in the overhang portion 40Y of the lower left piece 40B, the upper diameter is small and the lower diameter is large, so that the curved diameter of the upper left connecting portion 17A is small.

According to such a manufacturing method, it has a pair of grooves 15 and a pair of flat surfaces 16, and the distance between the joints 17B, 17B located at the lower right and upper left of the joint 17 is equal to the upper right. It is possible to form the suture needle B having the body 13 longer than the distance between the joints 17A located at the lower left.

The upper right piece 40A and the lower left piece 40B apply a force on the diagonal line of the suturing needle B. Since the pieces come into contact with each other, no more force is applied to the intermediate material P.
The suture needle B always having the same cross-sectional shape can be stably manufactured.

It should be noted that, unlike the press die 40 of the present embodiment,
The same press die can also be formed by integrating two pieces, the left piece and the upper piece in FIG. 4 and the right piece and the left piece. Further, in the above embodiment, the press die shown in FIG.
A symmetrical suture needle A is manufactured by using the press mold 30 shown in FIG.
Although an example of manufacturing a left-right asymmetrical suture needle B by 40 has been described, it is needless to say that the overhang portions 30Y, 40Y of the respective press dies 30, 40 are provided.
By changing the shape of Y, the other suture needles B and A can of course be manufactured.

[0064]

As described in detail above, in the suturing needle according to the present invention, the body is constituted by a pair of opposing surfaces and a pair of grooves intersecting with the surfaces and concave toward the center. When the pair of surfaces are arranged in the vertical direction, the value of the second moment of area can be increased to exhibit high bending strength. In particular, since the groove is formed in a concave shape toward the center of the trunk, the contact area with the living tissue at the time of piercing can be reduced, and piercing resistance can be reduced.

Further, according to the method of manufacturing a medical suture needle of the present invention, when press-forming an intermediate material, the pressing forces are balanced because adjacent pieces come into contact with each other. Therefore, since stable press working can be always performed, a medical method needle having no variation in cross-sectional shape can be manufactured.

[Brief description of the drawings]

FIG. 1 is a side view of a medical suture needle according to the present invention.

FIG. 2 is a diagram illustrating a cross-sectional shape of a trunk of the medical suture needle, and is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a diagram illustrating a cross-sectional shape of the medical suture needle in another configuration example.

FIG. 4 is an explanatory view of a mold for pressing the medical suture needle.

FIG. 5 is an explanatory diagram of a mold in another configuration example for pressing the medical suture needle.

FIG. 6 is a diagram illustrating a configuration of a suturing needle according to a first conventional example.

FIG. 7 is a diagram illustrating a configuration of a suturing needle according to a second conventional example.

[Explanation of symbols]

 A, B Suture needles 1 Needle tip 2 Needle tip 3 Body 4 Former end 4a Blind hole 5, 15 Groove 6, 16 Flat surface 7, 17, 17A, 17B Connection 30, 40 Press type

Claims (5)

[Claims] 1. A medical suture needle, comprising: a needle tip for penetrating a living tissue; a base end for attaching a suture; and a needle end formed between the needle end and the base end. At least the trunk portion is composed of a pair of flat surfaces facing each other, and a pair of grooves facing each other in a direction intersecting with the facing direction of the pair of flat surfaces, Each of the pair of grooves is formed by a curved surface having no edge, and a joint between the flat surface and the groove is also formed by a curved surface, and the pair of grooves is a curved needle having a side surface. Medical suture needle. 2. The medical suture needle according to claim 1, wherein the relationship between the width B and the height H of the cross section of the body part with respect to the bending direction of the medical suture needle is 0.7 <. B / H <1. 3. The medical suturing needle according to claim 1, wherein a curved diameter of a pair of joints facing each other is smaller than a curved diameter of another joint. Medical suture needle. 4. A method of manufacturing a medical suturing needle, comprising: using a press die having an upper piece and a lower piece facing each other, and a right piece and a left piece facing each other; A medical suture having a pair of flat surfaces and a pair of grooves in cross section by pressing the adjacent pieces in contact with each other in the pressing direction while sandwiching the lower piece, the right piece, and the left piece. A method for producing a medical suture needle for forming a needle. 5. The method for manufacturing a medical suture needle according to claim 4, wherein two pieces adjacent to each other among the upper piece, the lower piece, the left piece, and the right piece are integrated. Manufacturing method of a medical suture needle.