JPH01162590A - Manufacture of eyeless needle for operation - Google Patents

Abstract

PURPOSE:To prevent the generation of a crater by the generation of a spark by welding with the beam projection by superposing the initial welding part of the needle main body welded by at least bean projection and a pipe. CONSTITUTION:An eyeless needle is manufactured by integrally joining a needle main body 1 and pipe 2 linearly by projecting the laser light 6 of small power to these weld zone (a) from the outer peripheral side thereof with rotating them by synchronizing with chuck shafts 3a, 3b. The difficulty of the workability by piercing and the generation of a defective part can be prevented. Moreover smooth welding is ensured by a 2nd beam thermal spray on the welding turbulence caused at the initial welding part and the part of incomplete welding with a narrow welding width because the initial weld zone (a) is welded with the beam thermal spray by superposing it. The generation of a crater due to the spark generation can be prevented because of no need for making the projection power of the beam stronger.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of manufacturing an eyeless suture needle used in surgery.

<Conventional technology> Conventionally, as surgical suture needles, eyed needles with a through hole perpendicular to the needle axis were developed, and later, in order to reduce passage resistance and improve workability, the needle body was developed. Eyeless suture needles have appeared in which a thread attachment hole is drilled in the direction of the needle axis at the proximal end of the needle.

There are two types of eyeless suture needles: the popular drilled needle and the two-channel needle, but the drilled needle is becoming more popular due to its advantages in use. With the development of laser machining and the like, a technique for manufacturing the drilled needle by drilling a very small hole in a fairly small diameter needle has also been developed.

On the other hand, as shown in Japanese Utility Model Publication No. 28-3184, a technique was also developed in which an eyeless suture needle was constructed by integrally welding a pipe having a notch at the proximal end of the needle body.

<Problems to be solved by the invention> However, in the above-mentioned eyeless suture needle, as mentioned above,
It is possible to manufacture fine needles with a certain degree of fine hole diameter by using laser processing, etc., but this only makes it possible to drill the hole, and the accuracy of the hole diameter, straightness, etc. It is not possible to form a good hole by machining alone, and as shown in Japanese Patent Publication No. 81-58172, which is a patent application filed by the applicant, the hole must be corrected by other machining such as drilling. For example, O, lOm used in
Even if easy-to-cut free-cutting steel was used, it was extremely difficult to drill a hole with a microhole diameter of O.Q5Ism in a needle body with a microdiameter of +o.

- It is difficult to drill precise microholes in needles with needle diameters of 0.3 mm or less within the shell, leading to problems such as high manufacturing costs and a high yield rate due to high production of defective products. was there. Also, holes with relatively large diameters, e.g. 0.15 to 0.47
Even when drilling a hole of m1, it is difficult to drill a hole with a large proportion to the diameter of the needle material, that is, when drilling a hole with a thin wall thickness. Drilling a hole with a diameter of Q, 15+ am in a material is extremely difficult using conventional drilling methods.

゛ On the other hand, as mentioned above, there was a technique to construct an eyeless suture needle by welding a pipe to the proximal end of the needle body, but this could be done by ordinary butt welding (resistance welding) or various other welding methods. If this is done, large burrs will form on the outer and inner circumferential surfaces of the welded portion between the needle body and the pipe, and the burrs will bulge in a protruding shape, especially on the inner periphery, making it impossible to use them as they are. There were problems such as difficulty in secondary processing to remove this paris. Furthermore, since the end surfaces of the needle body and the pipe that are joined have different cross-sectional areas, the heating during welding becomes unbalanced. In other words, the pipe is heated first, so that the entire circumference of both is heated. There were problems such as difficulty in welding uniformly and completely, so it was rarely put into practical use.

In order to solve this problem, the applicant of this patent has developed a method for manufacturing an eyeless needle in which a laser beam or an electron beam is used to rotate and weld the base end surface of the needle body and one end surface of the pipe while abutting them. , and has already filed a patent application for this invention (Japanese Patent Application No. 153560/1982).

However, when the method for manufacturing the eyeless needle is carried out, the fifth
As shown in Figures 6(A) and 6(B), (a) the ring-shaped welding mark X between the needle body 1 and the pipe 2 causes welding disturbances at the first welding area A where the beam was irradiated at the start. (b) On the other hand, if the beam irradiation power is increased so that the first welded part A is completely welded, In the welding part B following the welding part A, there was a problem in that evaporation and scattering due to the generation of sparks caused craters to be generated in this part.

Furthermore, in order to solve these problems, we tried a method in which the needle body 1 and the pipe 2 were stopped when the beam irradiation started, and the needle body 1 and the pipe 2 were started rotating after sporadically irradiating the beam. On the other hand, the welded part A of the welded part A will melt too much, causing disturbances and craters in the welding mark There were also problems such as complexity and the risk of failure.

The method of the present invention relates to a completely new technique developed in view of the various problems mentioned above.

Means for solving the problem〉 Finally, Akira abuts the proximal end surface of the needle body and one end surface of the pipe, and applies a laser beam or electron beam to the abutted portion with respect to the axis of the needle body. A method of manufacturing an eyeless needle for surgery, wherein the welding method involves irradiating and welding while rotating relative to each other, wherein at least the first welded part welded by beam irradiation is overlapped and welded by beam irradiation. It is.

Effect> In the present invention, the eyeless suture needle is manufactured by integrally welding one end surface of the pipe to the proximal end of the needle body using a laser beam or an electron beam, so there is no need for the conventional hole drilling process. It is possible to prevent difficulty in workability and the occurrence of defective products due to trapping and drilling, and this also makes it possible to prevent airless suture needles and needle diameters that have a fine hole diameter in the needle body with a fine diameter. Thin-walled eyeless suture needles with large-diameter holes can be mass-produced reliably and inexpensively. Furthermore, as mentioned above, since the first welded part that has already been welded by beam irradiation is overlapped and welded by beam irradiation, the beam By irradiating the beam a second time, it is possible to reliably perform a completely smooth weld like other parts by irradiating the welding irregularities that occurred in the first welded part or parts where the weld rtJ is narrow and incompletely welded. I can do it.

In addition, since the method of the present invention does not require the irradiation power of the beam to be strong, some craters may occur due to the generation of sparks.
can be prevented from occurring.

Furthermore, since there is no need to change the beam irradiation speed at all between the start of beam irradiation and the subsequent beam irradiation speed, the mechanism for implementing this is simple and there is no risk of failure, and furthermore, the welded part is not melted by the beam irradiation. It is possible to prevent the occurrence of turbulence or disturbances after welding.

<Example> An example of the manufacturing method according to the present invention will be specifically explained with reference to the drawings as follows.

In the drawings, Fig. 1 is a side view showing the end portion in a state in which the present method is carried out, Fig. 2 is an explanatory view showing a specific example thereof, and Fig. 3 (
A) and (B) are explanatory diagrams showing the depth of welding or the focus of laser light, and FIG. 4 is a side view showing the appearance of the welding.

In carrying out the present invention, as shown in FIGS. 1 to 3, in addition to the needle body 1, a pipe 2 having the same outer diameter as the base end of the needle body 1 is prepared separately, and One end surface of the pipe 2 is closely or adjacent to the base end surface of the pipe 2 as shown in the figure. The pipe 2 was made by winding the same stainless steel band plate as the needle body 1 into a ring pipe shape, welding the seams, thinning it to a predetermined diameter by drawing a die, and cutting it to a predetermined size. It is something. These needle bodies 1 and pipes 2 are held by chuck shafts 3a and 3b, respectively, which are disposed facing each other on the left and right sides. On the other hand, these chuck shafts 3a and 3b are configured to be rotated in the same direction synchronously via a drive shaft 4 and a timing belt 5. 6 is a laser beam, which is irradiated onto the welded portion a between the needle body l and the pipe 2.

When irradiating this laser beam 6, a small power is continuously outputted, and in particular, as shown in FIG. 3(A).

As shown in (B), energy is irradiated according to the thickness of the pipe 2, and the focus position C of the laser beam 6 is adjusted such that the thickness of the pipe 2 becomes the melting depth by the laser beam 6. It is set.

Note that the focal point 1c is not limited to being inside the material, and may be set in front of the material.

Therefore, in carrying out the present invention, the needle body l and the pipe 2 are rotated synchronously by the chuck shafts 3a and 3b, and a low power laser beam 6 is applied to the welded part a from the outer periphery of the needle body l and the pipe 2.
By irradiating the needle body 1 and the pipe 2, it is possible to integrally join the needle body l and the pipe 2 in a straight line to manufacture an eyeless suture needle.

In particular, in the method of the present invention, as shown in FIG. 4, when irradiating the welded part a with a low-power laser beam 6 from the outer periphery, at least the first welded part A at the start is overlapped with the beam twice. By irradiating and welding,
Welding is disturbed in the first welding part A, and the width of the weld is narrow and welding is likely to be incomplete, so uniform and complete welding is performed, and this first welding part A is given exactly the same welding UX as the following welding part B. can be formed.

Some examples of specific implementations of the method of the present invention are as follows.

Example 1 The needle body l and the pipe 2 are butted together, 12Or, p, +
Rotate each of these at a (2r, p, s), and repeatedly irradiate the abutting portion with a pulsed YAG laser beam for 60 pulses at a speed of 100 p, p, s (100 pulses per second). /Pressed.

That is, when the beam irradiation was irradiated 11 revolutions from the starting point and then stopped, as shown in Fig. 4, the welding disturbance in the first welded part A at the start was completely eliminated, and the beam irradiation was repeated. The first welded part A was a weld Kx that was clean and uniform in appearance, just like the subsequent welded part B, and furthermore, when observing the cross section of the first welded part A irradiated with this beam, no melting was observed. Both the penetration depth and width were the same as those of the welded portion °B.

Example 2 Under exactly the same conditions as Example 1, the beam was irradiated with 50 pulses (one positive rotation) at a speed of 100 p, p, g and then stopped. In this case, the first welded part A was
Disturbances in welding occurred as shown in Figs. 6 and 6, and the welded portion was narrow and shallow, resulting in incomplete welding.

Example 3 The beam was irradiated with 51 pulses (11 rotations) under exactly the same conditions as in Example 1, and then stopped. In this case, the result in O 2 was almost the same as in Example 2.

Example 4 The beam was applied with 55 pulses (l-!) under exactly the same conditions as Example 1.
When the irradiation was stopped after irradiation (one rotation), in this case, it was almost the same as in Example 1, and the first welded part A was able to obtain the same appearance and welding depth as the subsequent welded part B.

Example 5 The beam was irradiated for 100 pulses (2 revolutions) and stopped under exactly the same conditions as in Example 1. In this case, almost the same effect as in Example 1 was obtained.

Example 6 The beam was irradiated under the same conditions as in Example 1 for 150 pulses (3 rotations) and then stopped. In this case, results that were approximately the same in appearance as in Example 1 were obtained.

However, when the bending strength of the product prepared in this example was measured, it was found that the bending strength around the welded portion was decreased.

This is thought to be because the welded area was heated three times, which caused the structure to coarsen and become brittle.

Example 7 The needle body l and the pipe 2 were irradiated with a pulse beam of 24 pulses at 2r, p, s (2 rotations per second) at 40p, p, s (40 pulses per second) and stopped. The welding part A had a uniform welding mark X and penetration depth as well as the following welding part B.

Therefore, based on these experiences, it is determined that the beam irradiation becomes steady after rotating the needle body 1 and the pipe 2 by 171° to 2/10°.

Although all of the above examples were carried out in an Ar atmosphere, it is thought that the oxidation phenomenon progresses to some extent because it does not mean that particles <02 are mixed in when heating is repeated.

In the above embodiment, the needle body 1 and the pipe 2 were butted against each other and rotated at the same time, but the first welding part A was made while rotating the beam without rotating the needle body 1 and the pipe 2.
It is also possible to overlap and obtain the same effect.

Furthermore, it is also possible to irradiate the beams from two or more locations and overlap the first welded portion A, and the same effect as in the above case can be obtained. It is also effective to use a continuous output beam instead of a pulsed beam as described above.

The principle of the present invention explained above is that even though welding is performed using a needle, which is a minute diameter, the entire circumference of the welded part is not heated at once, but only a small part of the surrounding area is heated to repeatedly melt and join. Since this is a method of welding the entire circumference, the heat capacity of the needle body 1 and the pipe 2 is involved in the first welding part A, so it takes some time, and during this time the temperature of the material in the irradiated part is low. Therefore, the fusion spot becomes smaller, the fusion trace x also becomes smaller in this area, and the penetration is also small, so it is thought that steady welding will not occur.

Therefore, the first welded part A will be in a steady state at the time of the second repeated beam irradiation, and the heat from the previous beam irradiation will be completely irrelevant, so steady welding and steady weld marks can only be obtained by re-irradiating the beam. This is something that can be done.

<Effects of the Invention> As described above, in the present invention, at least the first welded portion of the needle body and the pipe welded by beam irradiation are overlapped and welded by beam irradiation, so that The second beam irradiation will make the welding irregularities that occurred in the welding part or the part where the weld width is narrow and incompletely welded completely smooth and with no weld marks, just like the other parts following the first welding part. It is possible to reliably perform clean welding, prevent the occurrence of craters, etc. in the welded area, and furthermore, there is no need to change the beam irradiation speed from the beginning of beam irradiation to the subsequent beam irradiation speed. The apparatus for implementing this has the following characteristics: it can be easily constructed, there is no fear of failure, and eyeless suture needles can be mass-produced at low cost.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the main parts of the state in which this method is carried out, Fig. 2 is an explanatory diagram showing a specific example thereof, and Figs. 3 (A) and (B).
4 is an explanatory view showing the depth of welding or the focus of the laser beam, FIG. 4 is a side view showing the external appearance of welding, and FIGS. 5 and 6 are explanatory views of the prior art. l is the needle body, 2 is the pipe, 3a, 3b are the chuck shafts, 5
is the bell, G, 6 is the laser beam, A is the first welding part, B
is the welding part following it, X is the welding trace, a is the welded part, b is the wall thickness of the pipe 2, and C is the focal point position. Patent applicant Matsutani Seisakusho Co., Ltd. Agent Patent attorney Shukichi Nakashu Figure 1, Figure 11b2

Claims (1)

[Claims] A method of welding by abutting the proximal end face of the needle body and one end face of the pipe and irradiating the abutted portion with a laser beam or electron beam while rotating relative to the axis of the needle body. A method for manufacturing an eyeless surgical needle, characterized in that at least the first welded portion welded by the beam irradiation is overlapped and welded by beam irradiation.