JPS62101236A - Suturing needle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industry> - Field of Application The present invention relates to a suture needle used for medical purposes.

<Prior art> Conventional methods for finishing the surface of medical suture needles include puff polishing, electrolytic polishing, and chemical polishing, among which puff polishing is particularly popular. Many
It was being implemented. The reason for this is that there is no need to worry about wastewater treatment as it is a mechanical process, and the surface is relatively smooth and the polishing direction is in the axial direction of the needle, giving it a mirror surface to the naked eye. Even when magnified twice, it is possible to obtain a needle surface with uniform and extremely fine vertical lines as shown in FIG. 3.

On the other hand, the electrolytic polishing method is also sometimes carried out, but in this method, electricity is forced to flow through the needle to cause electrolysis and dissolve the surface, so it looks like a smooth mirror surface to the naked eye. Although the unevenness is very small, if you look at the surface of the needle under 3,000x magnification, you can see shallow craters caused by gas generated during electrolysis adhering to the surface, as shown in Figure 4. It had the disadvantage of having a rough surface.

Furthermore, unlike the electrolytic polishing method, the chemical polishing method is a method in which the surface of the needle is naturally dissolved by the acid without forcing a current to flow (of course, even in this case, in extreme places Depending on the crystal orientation of each crystal grain of the material, some crystal grains are easily polished and others are not, and this causes unevenness to be formed on the surface of the needle.

Recently, suture needles used in surgery are often made of austenitic stainless steel. In this case, in contrast to the general All weave shown in Fig. 5, the crystal grains in Fig. 6 are made to stand out - in order to soften only the holes. As shown, it has a so-called wire-drawn structure with elongated crystals. Therefore, when austenitic stainless steel in such a state is selectively melted using the chemical polishing method, it appears smooth and mirror-like to the naked eye, but when magnified 3,000 times, it has a 7th grade surface. As shown in the figure, it can be seen that the unevenness is formed in long stripes. The width of Saijo shown in Figure 7 is 1 to 6 m on the drawing.
m, the actual protrusions are about 0.3 to 2 W, and therefore, the unevenness formed on the entire surface is rough, 10 to 100 times larger than the unevenness formed on the needle manufactured by the above-mentioned puff polishing method. There was a problem with piercing performance.

<Problems to be Solved by the Invention> However, as mentioned above, even in suture needles manufactured by the puff polishing method, extremely fine unevenness lines are inevitably formed, which deteriorates the piercing performance. I was pushing him.

The suture needle according to the present invention is a completely new technology developed in view of these conventional drawbacks, and in particular, by applying an anti-friction agent to a needle manufactured by a specific abrasive finishing method, The purpose of the present invention is to provide a completely new suture needle that can significantly improve piercing performance by utilizing the lubricating effect of the needle.

Means for Solving the Problems The present invention provides a needle having a surface formed by chemically polishing the surface of steel that maintains the drawing structure as it is, from at least the tip to the body, and coating at least the tip of the needle with silicone. This is a medical suture needle characterized by the following structure.

As mentioned above, in the suture needle according to the present invention, at least the tip of the needle is coated with silicone, which is made by chemically polishing the surface of the drawn steel, so that the surface of the needle is coated with silicone. Since silicone is reliably filled into the rough longitudinal grooves and held firmly in place, a small portion of this silicone acts as a lubricant when the needle is inserted, thereby improving the penetration performance of the suture needle. can be significantly increased.

<Example> As mentioned above, in the prior art, suture needles whose surfaces were polished to a mirror finish by methods such as puff polishing, electrolytic polishing, and chemical polishing were used as they were; When used, all of them had a fair amount of penetration resistance, and as mentioned above, suture needles manufactured using the puff polishing method, which was considered to have the best penetration performance, were not fully satisfactory. .

Therefore, in order to investigate the penetration performance of needles manufactured by conventional methods, the inventors of the present invention
．． The penetration resistance (g) of a large needle of 8+a+s is 20
When investigating the maximum resistance up to the time of passing +sm, the results shown in Table 1 below were obtained.

Table 1 It is.

The present inventor has conducted various research and development over many years to determine whether or not it is possible to further improve the piercing performance of the suture needle manufactured by the method described above by subjecting the suture needle to some kind of processing. As a result, the inventors have discovered that when an abrasion reducing agent is applied to the surface of the needle, the surface frictional resistance of the needle can be reduced, thereby significantly improving the needle piercing performance.

However, since suture needles pass through bodily tissue,
It is possible to use only anti-friction agents that do not have a negative effect on the human body, and even among needles whose surface has been polished by the method described above, it is certain that the anti-friction agent can only be used on needles whose surface has been polished by a specific method. Does not stick.

Therefore, as will be described in detail later, it has become clear that even if a lubricant is applied to needles, the effect is only obtained on needles that have been polished using a special method.

First, when carrying out the present invention, we considered what could be used as an anti-friction agent, and it became clear that silicone was the only material that could be used because the suture needle passes through body tissue. Became.

It has also been found that among the currently commercially available silicones, the one whose biosafety has been officially recognized through experiments is limited to Tau Corning's NDX4-4159. A needle polished by the method was coated with silicone and a penetration test was conducted, and it was found that the chemically polished needle coated with silicone had extremely good piercing performance, and this good performance lasted for a long time. It turned out to be sustained.

FIG. 1 shows a suture needle according to the present invention, in which the needle tip portion 8 and body portion 7 are drawn wire tissue, and only the hole portion 6 is a general tissue. Needles manufactured by chemical polishing finishing method
Only the surface of the needle tip 8 is coated with silicone 2. FIG. 2 is an enlarged cross-sectional view of a part of the same, and silicone 2 is filled in the four-striped groove 4 formed between phase -1i of the protruding section 3 provided around the lily. .

In the figure, 5 is a suture thread attached to the hole 6 of the needle l.

M of austenitic stainless steel as wire drawn
When the surface is chemically polished in the 14 state, as already explained, as shown in Fig. 7, long rough irregularities are formed in the form of streaks, so when this is coated with silicone, the silicone cone 2 is When the needle 1 is inserted into the tissue of the body, only the protruding part 3 comes into contact with the tissue. It was discovered that a small part of the surface of the silicone 2 fixed in the four-striped groove 4 acts as a lubricant, making the needle l penetrate smoothly and significantly improving the needle l's penetration performance. It was done.

Furthermore, since the amount of silicone 2 consumed for one piercing of the needle 1 is extremely small, it has been found that the performance of the needle 1 hardly deteriorates even if the needle 1 is used several dozen times.

Next, we will investigate and research why the penetration performance cannot be significantly improved when silicone is applied to the needle outside the needle device, which has been chemically polished on the surface of the steel that is still drawn. However, it was found that the surface of the needle whose surface was electrolytically polished did not have the convex grooves 3 and grooves 4 as in the case of chemical polishing. Since the sharp uneven stripes are formed, there is no room for silicone to be inserted into these four stripes and adhered securely, so even if silicone is applied to needles manufactured by these methods, it will not work. It turned out that the effect was not that great. In particular, it has become clear that the silicone effect of these products is drastically reduced after several uses.

When applying the silicone 2 to the needle L in carrying out the present invention, methods such as dipping the silicone in a solution of a solvent or applying the silicone solution with a brush may be considered, but the following experiment Tau Corning NDX4-4
The needle was immersed in a 3% solvent solution of No. 159 silicone and dried.

Nine needles with a diameter of 0.8 mm were coated with silicone, and the maximum puncture resistance (g) until the tip passed through 20 m+a was investigated, and the results shown in Table 2 were obtained.

The numerical values are for various needle IO trees! This is the average value after piercing 0 times.

Therefore, in order to carry out the present invention, it is necessary that the crystal grains of the material of the needle remain in the elongated wire drawing structure, and that by chemically polishing the needle material that satisfies this condition, a certain degree of dimension in the axial direction is added to the surface of the needle material. It is clear that the major requirements are that the needle has elongated uneven stripes and that at least the tip of the needle is coated with silicone.

<Effects of the Invention> Since the suturing needle according to the present invention has the above-described structure and function, when the needle of the present invention is used, there is little penetration resistance through the body's M1 weave, and the needle can be penetrated extremely smoothly. is possible,
Furthermore, there is no risk of damaging the tissue or having any adverse effects.
Moreover, the needle according to the present invention has the characteristics that it can be mass-produced at low cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the needle according to the present invention, Fig. 2 is an enlarged explanatory cross-sectional view thereof, Figs. 3 and 7 are electron micrographs of the surface of the needle, and Figs. 4 to 6 are various views of the needle. FIG. 2 is an enlarged explanatory view of a mirror surface of a needle polished by the method described in FIG. 1 is) 1″, 2 is silicone, 3 is a convex part, 4 is a concave groove, 5 is a thread, 6 is a hole part, 7 is a body part, and 8 is a tip part. Patent applicant: Matsutani Co., Ltd. Manufacturing agent Patent attorney Shukichi Nakakaku Engraving of drawings (Contents (no changes) Figure 3 Figure 7 Figure 4;)l Figure 4 Figure 5 Figure 6 Procedure amendment writing method) % formula % 1. Indication of incident Patent Application No. 60-239294 2, name of the invention suture needle 3, relationship with the amended case Patent applicant name: Matsutani Manufacturing Co., Ltd. 4, agent address: Rainbow Building, 2-15-17 Nishi-Shinbashi, Minato-ku, Tokyo 8 F Place 503-0788 Name (6678)
Patent attorney Shukichi Nakagawa5, Date of amendment order (shipment date) January 28, 19856, Subject of amendment (1) Specification (1) "Electron micrograph" on page 11, line 17 of the specification The text has been corrected to "r 3,000 times enlarged view". (2) Amend Figures 3 and 4 as attached. 8. Attached documents

Claims (1)

[Claims] A medical suture needle characterized in that at least the tip and body of the needle have a surface formed by chemically polishing the surface of steel that maintains the wire drawing structure as it is, and at least the tip of the needle is coated with silicone.