JP3129753B2 - Eyeless suture needle with thread, crimping type, and method of manufacturing crimping type - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyeless suture needle with a thread, which has improved permeability and improved strength for living tissue, a crimping type for caulking the base end of the eyeless suture needle, and the crimping type. And a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a medical suturing needle for suturing a living tissue, an end of a suture is inserted into a blind hole formed at an original end and the outer periphery of the blind hole is swaged. An eyeless suture needle with a thread that combines the two (hereinafter, an eyeless suture needle with a thread that is joined by inserting a suture into a blind hole and an eyeless suture needle before the suture is combined) ) Is used. As the eyeless needle, a needle having a thickness in the range of 0.07 mm to 1.4 mm is selectively used depending on a site to be sutured. As a caulking type for caulking the outer periphery of a blind hole formed in an eyeless needle, there is a technique disclosed in Japanese Patent Publication No. 56-43420, for which the present applicant has already obtained a patent. This technique relates to a crimping type capable of caulking the original end of an eyeless needle into which a suture has been inserted into a perfect circle. FIG. 8 shows an example of an eyeless needle crimped by the above crimping type. In the drawing, a blind hole 51b having a predetermined depth is formed at a base end 51a of the eyeless needle 51, and after inserting the end of the suture 52 into the blind hole 51b, the base end 51a is removed. Caulking. The thickness of the caulked portion 53 is preset according to the size of the eyeless needle 51, the material and thickness of the suture 52, and the like. The reduced diameter portion 54 is an eyeless needle
The shape is set so as to be gradually reduced from the torso portion 51c to the thickness of the caulked portion 53. The reduced diameter portion 54 gradually reduces the diameter between the body portion 51c of the eyeless needle 51 and the caulked portion 53. For this reason, the trunk portion 51c and the reduced diameter portion
At the boundary portion with 54, the trunk portion 51c is hardly reduced in diameter, and the portion that slightly touches the reduced diameter portion 54 is spring-backed. For this reason, the boundary between the body portion 51c and the reduced diameter portion 54 is formed into a gentle curved shape. But caulking part 53
A corner 55 is formed at the boundary between the and the reduced diameter portion 54. As a method for producing the above-mentioned crimping mold, there is a technique disclosed in Japanese Patent Publication No. 63-57187, which has already been patented by the present applicant. This technique forms a caulked portion in a caulking mold accurately and easily, and applies an abrasive such as diamond powder to a metal wire such as iron or stainless steel, and applies an upper mold and a lower mold to the metal wire. By pressing the molds facing each other, the swaged portion is formed in a predetermined shape and size.

In general, a medical suture needle is required to have strength enough to withstand a plurality of piercings into a living tissue, to reduce piercing resistance, and not to cause unnecessary damage to the living tissue during suturing. Is done. However, the thickness of the eyeless needle is in the range of 0.07 mm to 1.4 mm, and when the staking ratio (thickness of the staking portion / thickness of the eyeless needle) is set to about 0.8, the thickness of the staking portion is 0.06 mm. ~ 1.1 mm. Therefore, the size of the swaged part in the swaged mold is 0.06 mm even if springback of the material constituting the eyeless needle is not considered.
It is not easy to manufacture a caulking mold having such dimensions. In other words, the current situation is to solve how to manufacture a caulking mold with high precision.

[0004]

In the conventional eyeless needle, when the original end is swaged and the suture is joined, a corner is formed at the boundary between the swaged portion and the reduced diameter portion. For this reason, in the case of an extremely thin eyeless needle, when any external force acts on the swaged portion, stress may be concentrated at the corner and break. Also, when a suture is inserted into the blind hole formed at the original end and swaged, the blind hole is formed at the boundary between the swaged portion and the reduced diameter portion even if the outer shape of the swaged portion is formed in a substantially parallel state. Most narrowed down in the corresponding part. For this reason, the joined suture may be cut inside the blind hole. In addition, if a gap occurs between the reduced diameter portion of the upper die and the reduced diameter portion of the lower die when manufacturing the crimping die, when the crimping die is used to crimp the eyeless needle, the crimping portion may bend. In such an eyeless needle, there is a possibility that piercing resistance increases and strength decreases. In order to solve this problem, it is necessary to maintain the mounting accuracy of the upper die and the lower die with respect to the processing device at a high level when processing the reduced diameter portion, which may increase manufacturing costs. .

[0005] In order to improve the strength of the eyeless needle and to improve the permeability (tissue permeability) with respect to the living tissue, it is only necessary to eliminate the formation of a corner which becomes a discontinuous portion in the molded portion of the base end. That is, it is preferable that the connection portion between the caulked portion and the reduced diameter portion in the eyeless needle is formed in a curved shape. In the plastic working field or the machine processing field, it is common sense to form a boundary of a processing portion having different dimensions in a curved shape (R chamfer). However, in the eyeless needle, the thickness of the torso that penetrates the living tissue is extremely thin, and therefore, when the outer circumference of the blind hole into which the suture is inserted is swaged, the thickness of the swaged portion becomes thinner. .

In such a crimping type for crimping an eyeless needle, it is difficult to form the caulking portion and the reduced diameter portion with high accuracy, and it is also difficult to form the connecting portion in a curved shape. Met. In particular, in order to improve the tissue passage property of the eyeless needle, it is necessary to make the cross-sectional shape of the crimped portion and the reduced diameter portion circular. For this reason, in the conventional caulking mold, the cross-sectional shape in the thickness direction of the caulked portion and the reduced diameter portion is not a simple circle but a curved line in which a plurality of circles are combined. In addition, in order to manufacture a caulking mold formed by dividing into an upper mold and a lower mold, an upper mold and a lower mold are urged in a direction in which they abut each other, and an abrasive is applied between these molds. The caulking portion and the reduced diameter portion are formed into a predetermined shape by inserting and rotating them and reciprocating in the axial direction. As described above, it has been difficult to mechanically form a connecting portion between a caulked portion formed by a curve in which a plurality of circles are combined and a reduced diameter portion formed by an ellipse in a curved shape.

[0007] An object of the present invention is to provide an eyeless needle that satisfies the above-mentioned conventional requirements and solves the above-mentioned problems, a crimping mold thereof, and a method of manufacturing the crimping mold.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an eyeless needle according to the present invention has a blind tip for forming a needle tip for penetrating a living tissue at a distal end and inserting a suture at an original end. In the eyeless suture needle with a thread formed and inserted with a suture in the blind hole and crimped at the original end, the crimped portion where the suture is connected to the eyeless suture needle and the thickness are adjusted to reach the crimped portion. A reduced diameter portion that is reduced is formed, and a boundary between the caulked portion and the reduced diameter portion is formed in a curved shape.

The caulking mold is divided into an upper mold and a lower mold. Each of the molds has a caulking portion for caulking a blind hole formed at the base end of the eyeless suture needle, and a thickness for the caulking. In a crimping type of an eyeless suture needle having a reduced diameter portion for reducing the diameter up to the crimped portion, a boundary portion between the crimped portion and the reduced diameter portion is formed in a curved shape. Things.

[0010] In the method of manufacturing a crimping die, the upper die and the lower die having a crimped portion having a predetermined shape and a reduced diameter portion are respectively formed with the crimped portion and the reduced diameter portion facing each other from the reduced diameter portion side. The elastic abrasive is inserted, and the elastic abrasive is applied with a pressing force in the axial direction and rotated to form a connection portion between the caulked portion and the reduced diameter portion in a curved shape.

[0011]

According to the eyeless needle, when a suture is inserted into the blind hole formed at the base end and swaged, the base end is reduced in diameter at a predetermined swaging ratio and the body of the eyeless needle. In addition to forming the reduced diameter part whose diameter is gradually reduced from the part to the reduced diameter part, and forming these boundaries in a curved shape, it improves the permeability to living tissue and improves the strength And does not cut the suture inserted into the blind hole.

According to the caulking mold, when the end of the suture is inserted into the blind hole formed at the base end of the eyeless needle and caulked, the outer shape from the reduced diameter portion to the caulked portion is formed into a continuous curve. Can be molded. Therefore, no corner is formed at the boundary between the reduced diameter portion and the caulked portion unlike the conventional caulking mold. Therefore, when the base end of the eyeless needle is swaged, the strength and tissue permeability of the eyeless needle can be improved.

Further, according to the above-described method for manufacturing a crimping die, a connecting portion between the reduced diameter portion and the caulking portion in a crimping die manufactured using a conventional method can be formed in a curved shape.
That is, the upper die and the lower die, each of which has a predetermined reduced diameter portion and a caulked portion, are opposed to each other and are brought into contact with each other. Then, when the elastic abrasive is inserted from the reduced diameter portion side and rotated by applying a pressing force in the axial direction to the elastic abrasive, the elastic abrasive first deforms along the shape of the reduced diameter portion. Since a pressing force in the axial direction is applied to the elastic abrasive, the tip of the elastic abrasive is introduced into the caulked portion while deforming along the shape of the reduced diameter portion. At this time, the connecting portion between the reduced diameter portion and the caulked portion is polished by the elastic abrasive to form a curved shape.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an eyeless needle, a caulking mold and a method for manufacturing a caulking mold to which the above means are applied will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a formed portion of the caulking mold, FIG. 2 is a front view of the caulking mold, and FIG. 3 is an enlarged side view of a base end of the eyeless needle. Crimping type A shown in FIGS. 1 and 2
Is composed of an upper mold 1 and a lower mold 2 and, as shown in FIG.
The forming part 5 including the caulked part 5a and the reduced diameter part 5b is formed into a continuous curve at the base end 3a without having a discontinuous part. Accordingly, an angle is not formed in the eyeless needle 3 whose original end 3a is swaged by the swaging type A, unlike the conventional eyeless needle. For this reason, it is possible to eliminate the concentrated portion of the stress in the molded portion 5 of the eyeless needle 3, and it is possible to improve the tissue passage property. Further, since the swaged portion 5a and the reduced diameter portion 5b are formed in a continuous curve, the blind hole is not extremely narrowed at this portion, and therefore, the cutting of the suture inserted into the blind hole is prevented. I can do it.

It is preferable to use a material having high hardness such as heat-treated carbon tool steel (SK) or tungsten carbide (WC) as a material constituting the caulking mold A. In this embodiment, the material of the swaging type A is WC
Is used. A crimping portion 6 for forming a crimping portion 5a at the base end 3a of the eyeless needle 3 shown in FIG. A reduced diameter portion 7 for forming a reduced diameter portion 5b for gradually reducing the thickness of the original end portion 3a from the portion 3b to the caulking portion 5a is formed at a position facing each other. A curved connecting portion 8 is formed at the boundary between the caulking portion 6 and the reduced diameter portion 7.

A procedure for caulking the original end of the eyeless needle 3 in which the end of the suture thread 4 is inserted into the blind hole using the caulking mold A configured as described above will be described. If the sole purpose is to only connect the suture to the eyeless needle, it is possible to connect with a single swage. However, in order to improve the permeability of the eyeless needle to the living tissue, it is preferable that the cross-sectional shape of the caulked portion and the reduced diameter portion is circular. For this reason, in the caulking mold A of this embodiment, the former end 3a once caulked by the molds 1 and 2 is further caulked from a perpendicular direction so that the caulked portion 5a and the reduced diameter portion 5b have a circular cross-sectional shape. Make up.

First, the upper mold 1 and the lower mold 2 are attached to a caulking device (not shown). Suture 4 between these molds 1 and 2
The first end portion 3a of the eyeless needle 3 into which is inserted is driven, the first caulking is performed by driving the caulking device, and then the eyeless needle 3 is turned 90 degrees to perform the second caulking, thereby performing the second caulking. 3a is caulked as shown in FIG. 3 according to the shapes of the caulked portion 6, the reduced diameter portion 7 and the connecting portion 8. At this time,
The boundary between the swaged portion 5a and the reduced diameter portion 5b in the formed portion 5 is formed in a curved shape, and the cross-sectional shape of the formed portion 5 in the longitudinal direction is such that the swaged portion 5a and the reduced diameter portion 5b are connected by a curved line. It becomes a continuous curved shape. In this way, no discontinuous corners are formed in the molded part 5, and
Even if some external force acts on the surface, stress does not concentrate at one place. Therefore, the strength of the eyeless needle 3 can be improved. In addition, since the outer shape of the molded portion 5 is a continuous curve, the frictional resistance when the eyeless needle 3 passes through the living tissue can be reduced, and the tissue permeability can be improved.

Next, a description will be given of a method of manufacturing the caulking mold A configured as described above. 4 is a plan view of a flat jig to which an upper mold and a lower mold are attached, FIG. 5 is an explanatory view when forming a caulked portion, FIG. 6 is an explanatory diagram when forming a reduced diameter portion, and FIG. 7 is a caulking portion It is explanatory drawing at the time of forming the connection part with a reduced diameter part in a curved shape. First, as shown in FIG. 4, an upper mold member 1a and a lower mold member 2a whose outer shapes are formed in a predetermined shape in advance are fitted into grooves formed in the flat jig 10, and movably attached along the grooves. At this time, a spring 11 fixed to a plane jig 10 is brought into contact with an end of each of the mold members 1a, 2a to urge the mold members 1a, 2a in a direction in which they come into contact with each other.
A spacer having a predetermined size between 2a and having a function as a stopper is inserted to adjust the interval. Thereafter, a core made of an iron wire or a stainless steel wire having a predetermined thickness coated with a diamond paste serving as an abrasive is inserted into the contact surfaces of the mold members 1a and 2a, rotated and simultaneously moved in the axial direction. Initially, the mold members 1a and 2a are separated from each other by the insertion of the core metal, but are polished in a circular shape according to the outer shape of the core metal because the urging force of the spring 11 acts.
As the polishing operation progresses, the mold members 1a and 2a approach each other and contact a spacer to maintain a predetermined interval. When the polishing operation is completed and the spacers inserted between the mold members 1a and 2a are removed and the mold members 1a and 2a are brought into contact with each other, the mold members 1a and 2a have the shape shown in FIG. Polished. Next, a metal core having a thickness corresponding to the dimensions of the caulked portion 6 coated with the diamond paste is inserted into the already formed polishing position, rotated and simultaneously moved in the axial direction. By this polishing operation, the mold members 1a, 2a
Is polished as shown in FIG. This allows
The basic shape of the caulking part 6 is formed. Next, FIG.
As shown in (1), a bamboo skewer or a wooden skewer with diamond paste applied to the polished mold members 1a and 2a is inserted and rotated, and simultaneously moved in the axial direction to polish the corners formed on the polished surface. By this polishing work, the shape 1
As shown in FIG. 5C, a and 2a are polished, and this portion is formed as a caulked portion 6. The cross sections of the mold members 1a and 2a in this state are formed by parallel planes as shown in FIG.

As described above, the reduced diameter portion 7 continuous with the caulked portion 6 is formed on the mold members 1a and 2a having the portion corresponding to the caulked portion 6. The step of forming the reduced diameter portion 7 is performed by the above-described caulking portion 6.
Is performed by the same process as the forming process. That is, FIG.
As shown in (A), a tilt jig 12 having a predetermined tilt angle
With the caulking part 6 already formed facing the
a, 2a are attached. The inclined jig 12 is basically configured in the same manner as the flat jig 10, and differs in that the mounting surfaces of the mold members 1a and 2a are inclined at a preset angle. The profile 1a attached to the inclined jig 12,
First, a diamond paste is applied to a core metal having a thickness corresponding to the shape shown in FIG. 5 (A) and inserted into the caulking portion 6 of FIG. 5A, rotated and simultaneously moved in the axial direction. A reduced diameter portion corresponding to the above is formed. Next, a diamond paste is applied to a metal core 9 having a thickness corresponding to the small-diameter portion shown in FIG. 5B, inserted and rotated, and simultaneously moved in the axial direction, so that the caulking portion 6 is formed.
And a reduced diameter portion 7 is formed. In this state, as shown in FIG. 6 (B), the cross section in the axial direction of the mold members 1a and 2a is such that a caulked portion 6 formed in parallel and a reduced diameter portion 7 having a predetermined inclination angle are continuous. The connecting portion between the caulked portion 6 and the reduced diameter portion 7 is formed as a discontinuous point where two straight lines intersect. Further, a cross section in the thickness direction has a corner portion as in FIG. 5B.

Next, as shown in FIG. 7A, the shape members 1a and 2a formed by continuously forming the caulked portion 6 and the reduced diameter portion 7 as shown in FIG. Make contact with each other. Then, diamond paste is applied to a tool 13 having a predetermined size and having an appropriate elasticity, which is formed from the reduced diameter portion 7 side, and is passed therethrough. The tool 13 is rotated while being pressed in the axial direction. A discontinuous point at the connection between the portion 6 and the reduced diameter portion 7 is polished. Thereby, the shape members 1a,
As shown in FIG. 7 (B), the cross-sectional shape of 2a can be formed in a continuous curved shape in which a curved connecting portion 8 is formed at the boundary between the caulked portion 6 and the reduced diameter portion 7.

The tool 13 must be made of a material that can be deformed in response to an external force acting on the tool 13 and that can be restored to a substantially original shape when the external force is removed.
When the tool 13 is inserted from the reduced diameter portion 7 side of the moldings 1a and 2a and pressed and rotated by using the tool 13 made of the above-described material, the tool 13 is reduced in diameter by the applied pressing force. It deforms along the shape of the portion 7 and the caulking portion 6, and polishes the contact portion. At this time, the tool 13
The contact pressure at the discontinuous point formed at the connecting portion between the caulked portion 6 and the reduced diameter portion 7 is increased. Therefore, the polishing amount at the discontinuous point is larger than the polishing amount at the caulked portion 6 and the reduced diameter portion 7. Become. The tool 13 is not formed in advance to grind the discontinuous point, but is simply deformed by its own elastic force. For this reason, the tool 13 deforms and grinds the discontinuous point as it is pushed from the reduced diameter portion 7 side to the caulking portion 6 side, and this deformation causes a curved connection to the boundary between the caulked portion 6 and the reduced diameter portion 7. The part 8 can be formed. Therefore, the radius of curvature at the connection portion 8 is not a particularly controlled numerical value.

According to the experiments conducted by the present inventors, the most preferable result was obtained when using wood such as a toothpick or bamboo skewer as the tool 13. However, synthetic resin may be used as long as it has elasticity. Further, it is more preferable that the tool 13 is a synthetic resin having an appropriate elastic force and having a surface in which an abrasive is embedded in advance. The shape of the tool 13 may be a round bar. But
A tapered tip has more favorable results.

[0023]

As described above in detail, according to the eyeless needle according to the present invention, when a suture is inserted into a blind hole formed at the original end and swaged, the swaged portion is formed at the original end. Since the reduced diameter portion and the connection portion are formed in a curved shape, even if some external force acts on the base end, stress concentration does not occur and the strength is improved. I can do it. In addition, since the base end is crimped in a continuous curve, the permeability to living tissue can be improved, and the suture inserted into the blind hole is not cut.

Further, according to the crimping type according to the present invention, the base end of the eyeless needle into which the suture is inserted can be crimped in a continuous curve without forming a corner. Therefore, no corner is formed at the boundary between the reduced diameter portion and the caulked portion unlike the conventional caulking mold, and therefore, when the original end of the eyeless needle is caulked, the strength and tissue permeability of the eyeless needle are reduced. Can be improved.

According to the method of manufacturing a crimping die according to the present invention, a curved connecting portion can be easily formed at the boundary between the crimping portion and the reduced diameter portion. Even if a slight displacement occurs between the caulked portion formed in the upper die and the lower die and the reduced diameter portion, the displacement is formed by forming these connection portions in a curved shape. It is characterized in that it is possible to manufacture a caulking mold in which the influence of is eliminated.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view of a formed portion of a caulking mold.

FIG. 2 is a front view of a caulking mold.

FIG. 3 is an enlarged side view of a base end of the eyeless needle.

FIG. 4 is a plan view of a flat jig to which an upper die and a lower die are attached.

FIG. 5 is an explanatory view when forming a caulked portion.

FIG. 6 is an explanatory diagram when a reduced diameter portion is formed.

FIG. 7 is an explanatory view when a connecting portion between the caulked portion and the reduced diameter portion is formed in a curved shape.

FIG. 8 is a side view of the base end of an eyeless needle caulked by a conventional caulking mold.

[Explanation of symbols]

A is a caulking mold, 1 is an upper mold, 2 is a lower mold, 1a and 2a are molding materials, 3 is an eyeless needle, 3a is a base end, 4 is a suture, 5 is a molded part, 5a is a caulked part, and 5b is a shrinkage part. A diameter portion, 6 is a caulked portion, 7 is a reduced diameter portion, 8 is a connection portion, 9 is a metal core, 10 is a flat jig, 11 is a spring, 12 is an inclined jig, and 13 is a tool.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-150889 (JP, A) JP-A-61-146468 (JP, A) JP-A-61-103438 (JP, A) JP-A-2- 57243 (JP, A) JP-A-64-33319 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61B 17/06 310 B21G 1/02

Claims (3)

(57) [Claims] 1. A thread having a needle tip for penetrating a living tissue at a distal end, a blind hole for inserting a suture at an original end, and a suture inserted into the blind hole to caulk the original end. In the attached eyeless suture needle, a swaged portion where a suture is connected to the eyeless suture needle and a reduced diameter portion whose thickness is reduced to reach the swaged portion are formed, and the swaged portion and the reduced diameter are formed. An eyeless suture needle with a thread, characterized in that the boundary with the portion is formed in a curved shape. 2. A caulking portion and a thickness for caulking a blind hole formed at an original end portion of an eyeless suture needle in each of the upper and lower molds. In a crimping type of an eyeless suture needle having a reduced diameter portion for reducing the diameter of the eyeless suture needle, a boundary portion between the crimped portion and the reduced diameter portion is formed in a curved shape. Caulking type. 3. An upper mold and a lower mold having a caulked portion and a reduced diameter portion having a predetermined shape, respectively, with the caulked portion and the reduced diameter portion facing each other, and an elastic abrasive material inserted from the reduced diameter portion side. A method of manufacturing a crimping die for an eyeless suture needle, comprising applying a pressing force in the axial direction to the elastic abrasive material and rotating the elastic polishing material to form a connection portion between the crimping portion and the reduced diameter portion in a curved shape.