JPH0744933B2 - Method for manufacturing suture needle with thread - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of manufacturing a suture needle with a thread used in medical surgery.

(Prior Art) As a suture needle with a thread, (1) a pilot hole smaller than the thread diameter to be coupled to the end portion on the needle base side is provided, and this pilot hole is used as a coupling hole approximately equal to or larger than the thread diameter. The needle is integrally formed with the needle by crimping the connecting end of the thread inserted into this connecting hole and crimping the outer periphery of the connecting hole of the needle (for example, Japanese Patent Publication No. 59-15
648), and (2) a groove formed over almost the entire length of the needle main body, and a part of the suture thread is fitted and caulked into the entire length of the groove (for example, Japanese Patent Laid-Open No. 61-103438). It has been known.

(Problems to be Solved by the Invention) In the first case in which the thread is caulked in the coupling hole formed on the needle base side, in the case where the suture needle is broken during operation by any reason, it is connected to the thread. Since the other suture needle is entangled in the tissue, it takes time and labor to take out the remaining suture needle, which may adversely affect the operation.

In the second case in which the suture thread is caulked in the groove portion formed in almost the entire length of the needle body, since the groove portion has scratches in almost the entire length of the formed suture needle with thread, there is no scratch on the needle surface. The requirements of JIS that require that are not satisfied. Moreover, since this suture needle is made of plate material and cannot sufficiently grind the cutting edge, cutting edge, etc., it requires good sharpness.
It does not meet other requirements of JIS and is not suitable for practical use as a suture needle. Moreover, when the suture needle having this configuration is heat-treated, the suture thread fixed to the suture needle is damaged by the high heat treatment temperature transmitted from the groove portion, so that it is difficult to increase the hardness and strength of the suture needle by the heat treatment.

(Means for Solving Problems) The present invention has been made to solve the above problems,
After inserting the insertion thread material into the long hollow tube, the long hollow tube is cut into unit lengths, and the insertion thread material at one end of the cut hollow tube is slightly inward from the end surface. After that, the tip swaging is performed, the needle tip is formed in the tip swaging portion, and the suture thread is fixed directly or indirectly to the rear end of the insertion thread material. The inner thread material at one end of the cut hollow tube is set slightly inward from the end surface of the hollow tube because the inner thread material is pushed inward from the end surface of the hollow tube or the end of the inner thread material is cut. To cut the end of the intercalated thread material,
For example, the end surface of the hollow tube may be conical and the inner thread member may be cut off together with the inner surface of the end portion of the hollow tube.

Fixing the suture thread directly to the rear end of the interpolating thread material means fixing the suture thread to the interpolating thread material by adhesion or welding. To be fixed to means that the rear end of the insertion thread material is fixed to the rear end of the suture needle, and moreover, the tip of the suture is fixed to the rear end of the suture needle. At this time, the suture thread may be fixed to the insertion thread material by caulking separately, or may be fixed by overlapping the suture thread on the rear end of the insertion thread material and caulking together.

(Operation) In the suture needle with thread according to the present invention, the intercalating thread material inserted into the hollow hole of the suture needle main body has one end fixed to the distal end side of the needle main body and the other end directly or indirectly fixed to the suture thread. Therefore, even if the suture needle is broken during the operation, the distal end portion of the needle and the intercalating thread material are integrally connected to the suture thread to allow the suture thread to be taken out of the tissue. Further, since the insertion thread material is inserted into the long hollow tube and the long hollow tube is cut into a unit length, the deformation at the time of cutting is reduced by the insertion thread material.

By making the inserted thread material at one end of the cut hollow tube slightly inward from the end surface, the inserted thread material does not come out to the needle tip when the tip is the needle tip.

By performing the tip swaging process slightly inward from the end surface of the hollow tube, the inserted thread material is fixed to the tip portion of the hollow tube.

(Example) FIG. 1 shows an example of a suture needle A with a thread made according to the present invention, and the suture needle 1 shows a case where the needle body has the most general shape curved in an arc shape. When the tissue to be sutured is hard, for example, approximately 1/3 of the needle tip is triangular, approximately 1/3 of the middle portion is circular, and the remaining needle rear end is About 1/3 of the shape is elliptical. The tip 2 of the needle tip 2 is usually formed with a tip angle θ of a predetermined size, and a cutting edge is formed in the triangular cross section of the tip of the needle. However, when the tissue to be sutured is soft, the cross-sectional shape of the needle tip portion is more suitable than the square shape.

Next, the procedure for producing the suture needle A with thread according to the present invention will be described for the case where a small diameter hollow tube of SUS301 is used as the needle material (see FIGS. 2 to 10).

(1) The material of the endlessly wound needle is stretched straight to form a small diameter hollow tube 1a with a predetermined length L (for example, 1 to
3m) to cut. After the cutting, burrs and the like formed at the cutting points are removed, and the shape of the end face of the hollow hole 3 is returned to the shape before deformation (Fig. 2).

(2) A hollow tube 1a is inserted from one end of the hollow tube 1a into the entire length of the hollow hole 3 and the both ends thereof are temporarily pressed by the hollow tube 1a.
While pushing out 1a in one direction, the length 1 (8 ~
Unit length (l
Cut with + α) (Fig. 3). At the time of cutting, a pressing force is applied to the cutting portion to hold the inserted thread material in the hollow tube so as not to move.

(3) Since both ends of the cut hollow tube 1b hold the inserted thread material 4 by the pressing force at the time of cutting, a pressing force is applied to the inserted thread material 4 at one end of the hollow tube 1b. , The inner thread material 4 is moved. After making one end of the inserted thread material 4 slightly inside the end surface of the hollow tube 1b (Fig. 4A), the tip of the hollow tube 1b is subjected to esging processing so that the inserted thread material 4 is removed from the outside. Fix it with the needle tip 2 so that it cannot be seen (Fig. 5). Instead of the pushing process, a hole is drilled at one end of the hollow tube 1b so as to be approximately equal to or slightly larger than the inner thread material 4 so that the inner thread material 4 is slightly inside the end surface of the hollow tube 1b. After this (FIG. 4B), the tip of the hollow tube 1b may be swaged.

As another tip swaging process for the hollow tube 1b, the inner thread material 4 is held between the tip of the hollow tube 1b and the front side of the rear end surface (Fig. 4C). The material 4 is moved to the rear end side until it is released from the holding action on the front end side of the hollow tube 1b, and the inner threaded material 4 extruded from the rear end surface is cut to hollow the inner threaded material 4. Push the tube 1b slightly to the front end side (Fig. 4D), hold both ends of the inserted thread 4 by caulking, and then swage the tip of the hollow tube 1b. May be. In this case, the number of steps required for drilling holes on the needle base side is reduced.

(4) The needle tip 2 of the hollow tube 1a is pressed to completely close the tip of the needle tip, and in the case of a round needle, the tip shape of the tip.
Form 2a. In case of a square needle, it is approximately 1/3 of the needle tip.
Triangular pressing is performed to some extent to form a cutting edge. The surface of the hollow tube 1b on which the cutting edge and the cutting edge are formed is roughly ground to form an intermediate suture needle 1c (Fig. 6).

(5) Caulking a certain range (for example, about 5 mm) or slightly inside from the end surface of the rear end of the intermediate suture needle 1c (Fig. 7A,
B) After fixing the inner threading material 4 at the needle rear end, the intermediate suture needle 1c
Is cut from the needle tip at the specified needle length l (7th
Figure).

(6) The cut intermediate suture needle 1c is pressed to give the intermediate suture needle 1c a shape such as a semicircular bend or a 3/8 circular bend to form the suture needle 1. The suture needle 1 is subjected to a low temperature heat treatment (for example, at 450 ° C. for 30 minutes) to increase hardness (for example, from Hv480 to 500) and strengthen (strength).
Figure).

(7) In order to eliminate fine damage and discoloration that occur on the surface of the suturing needle 1 due to bending and low-temperature heat treatment, the suturing needle 1 is surface-finished by electrolytic polishing (or chemical polishing is possible) or washing. For cleaning, ultrasonic cleaning, CFC cleaning, or the like can be used.

(8) The hole diameter of the hollow hole 3 at the rear end portion of the suture needle 1 is enlarged by drilling, electric discharge machining, or the like, and the suture thread 6 is inserted into the attachment hole 5 formed by the enlargement to fix the outer peripheral portion of the attachment hole 5. Caulking and fixing the outer circumference of the suture thread 6 to the inner surface of the mounting hole 5. In this embodiment, the suture thread 6 is in a state of abutting against the end surface of the interlining material 4, but no binding force acts between them. However, when it is desired to exert a bonding force between them and to strengthen the fixing of the suture thread 6 by the suture needle 1, the abutting surface of the interlocking thread member 4 and the suture thread 6 and the mounting hole 5 are attached.
An adhesive may be applied between the inner surface of the and the outer circumference of the suture thread 6 (Figs. 9 and 10).

The suture needle manufacturing procedure described above applies to hollow tubes made of SUS301 as the material of the suture needle 1 and hollow tube made of SUS304 or titanium, which has Hv hard skin satisfying the hardness required for the suture needle 1 by aging or heat treatment. Can also be applied. However, suture 1
When using a material such as silicoloy that satisfies the hardness required from the beginning and also has a small elongation, in order to remove discoloration due to low-temperature heat treatment after press bending and low-temperature heat treatment in the manufacturing procedure described above. The electrolytic polishing step is unnecessary.

According to the method of this embodiment, the hollow fiber 1a is cut into a predetermined length by inserting the interlining material 4 into the whole hollow tube 1a having a small diameter and cut into a long length. The insertion thread member 4 can be inserted into the large number of hollow tubes 1b cut by the insertion operation of. For this reason, the number of steps required for insertion is significantly reduced as compared with the case of inserting the interlining material 4 into each of the large number of hollow tubes 1b cut into a predetermined length. In addition, when cutting the hollow tube 1a having a small wall thickness, deformation is suppressed to a minimum by the insertion thread member 4 inserted in the hollow tube 1a, and both ends of the hollow tube 1b are cut into a predetermined length. Since the insertion thread member 4 is lightly fixed by the pressing action at the time of cutting, the work of the next step is facilitated.

Moreover, even if the suture needle 1 is broken during the operation, since the broken pieces are connected to each other by the inserted thread member 4 fixed to the tip end portion and the rear end portion of the needle, they are out of the tissue. By simply pulling the portion of the suture needle 1, the broken portion remaining in the tissue can be easily taken out of the tissue.

Further, since the suture needle 1 is made of the hollow tube 1a and the blade tip and the cutting blade can be easily polished, the suture needle 1 can be provided inexpensively and has a clean cut surface and a good sharpness.
Further, since the suture thread 6 is crimped to the attachment hole 5 on the rear end surface of the needle individually at the final stage, the suture thread 6 can be subjected to low temperature heat treatment before the suture thread 6 is fixed. In addition, the hardness and strength of the suture needle 1 can be increased, and the suture needle thread 6 which is likely to occur when the suture thread 6 is inserted into the suture needle 1 can be prevented.

(Effects of the Invention) The present invention is to insert an inner thread material into a long hollow tube, cut the long hollow tube into unit lengths, and insert the thread at one end of the cut hollow tube. After making the material slightly inward from the end surface, tip swaging is performed, a needle tip is formed in the tip swaging portion, and the suture thread is fixed directly or indirectly to the rear end of the inserted thread material, The following excellent effects can be obtained.

(1) Since the inner thread is inserted into the entire long cut hollow tube to cut the hollow tube into a predetermined length, each hollow tube cut into a predetermined length Compared with the case of inserting the inserted thread material, the number of steps required for insertion is remarkably small, and the deformation of the hollow tube at the time of cutting is suppressed to the minimum by the inserted inserted thread material.

(2) Even if the suture needle is broken during surgery, the inserted thread material connected to the suture thread is fixed to the tip of the suture needle, preventing the broken needle piece from remaining in the tissue. can do.

(3) Since the suture needle is manufactured by subjecting the hollow tube to the tip swaging, polishing of the cutting edge and the cutting blade is easy, and the suture needle having a clean surface with no scratches and good cutting resistance can be provided at low cost. Moreover, since the inserted thread material at one end of the cut hollow tube is slightly inward from the end surface, the inserted thread material does not come out to the tip of the needle.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view of a suture needle with a thread made by the method of the present invention, FIGS. 2 to 10 are drawings showing an example of the manufacturing procedure of the present invention, and FIG. A front view of a wound small-diameter hollow tube cut long, FIG. 3 is a partial cross-sectional front view showing cutting of a long hollow tube in a unit slightly longer than the needle length, Figure 4 (A) (B)
(C) (D) and FIG. 5 are partial cross-sectional front views showing the procedure of tip swaging, FIG. 6 is a front view showing a state during formation of an intermediate suture needle, and FIGS. 7 (A) and (B) are FIG. 8 is a partial cross-sectional front view showing a state in which the rear end portion of the intermediate suture needle is caulked to fix the inserted thread member, and FIG. 8 is a partial sectional front view in which the intermediate suture needle is curved to form the shape of the suture needle. FIG. 9 is a cross-sectional view of an essential part showing a state when a suture thread attachment hole is formed, and FIG. 10 is a cross-sectional view of an essential part showing details of the suture thread attachment part. 1 ... Suture needle, 1a ... long hollow tube, 1b ... cut hollow tube, 1c ... intermediate suture needle, 2 ... needle tip, 2a ... blade shape, 3 ... hollow hole 4 ... Inner thread material, 5 ... Mounting hole,
6 ... suture

Claims (1)

[Claims] 1. An insert thread material is inserted into a long hollow tube, the long hollow tube is cut into a unit length, and the insert thread material at one end of the cut hollow tube has an end surface. A thread characterized in that the tip is swaged slightly further inward, a needle tip is formed in the tip swaged portion, and a suture is fixed directly or indirectly to the rear end of the intercalation thread material. Of manufacturing a suture needle with a needle.