DE102008015848A1 - An eyelet needle and method of making the same - Google Patents

Abstract

A pillar fracture-proof, eyeleted needle is provided in which an opening can be formed. An eyelet-equipped needle according to the present invention includes a pair of resilient columns 6 and 6 formed on an end 1a of a stainless steel needle material 1 having a predetermined shape and a predetermined diameter of 0.1 to 0.15 Wt .-% carbon, 8.00 to 10.00 wt .-% nickel, 17 to 20 wt .-% chromium and <= 0.7 wt .-% manganese are formed, and a spring opening 2, which between the pair is formed on resilient columns.

Description

BACKGROUND OF THE INVENTION

FIELD OF THE INVENTION

The The present invention relates to an eyelet Needle and a method for producing the same. Especially it concerns a column break-proof, with an eye provided with a needle and a method for producing the same.

DESCRIPTION OF THE RELATED TECHNOLOGY

It It is necessary to have needles for surgery allow easy insertion of a suture and at the same time prevent the inserted thread from tearing off.

sewing needles can in needless sewing needles, which through Making an opening from the base end of the needle material along the axis center and then inserting a suture be created in this opening and caulking thereof and needles, which are provided with an eyelet, are divided is produced by producing a spring opening, which through the base of the needle material perpendicular to the axis center of the needle material goes. The needles provided with an eyelet are going through Producing a passage opening, which as a spring opening is referred to, made in the base end of the needle. Columns, which provide a spring effect, are on both sides of the spring opening formed and a suture is for use by the spring opening inserted from the slot, which between the columns is formed.

The 1a to 1f FIG. 12 is a schematic illustration of the manufacturing process of a conventional eyelet-providing needle with pillars provided with a spring device disclosed in patent document 1 (US Pat. Japanese Patent No. 2706677 ) is disclosed.

at This conventional working example is stainless austenitic steel as starting material for those with an eyelet Needle used. Because the austenitic stainless steel through a heat treatment can not be cured, a thick wire rod is the Subjected to wire drawing, resulting in a thinner nominal diameter leads. After that he is hardened. Since that only once executed wire drawing in many cases the target diameter can not deliver, wire drawing is usually executed twice or more often.

Of the Wire rod, which is subjected to wire drawing, becomes harder. Even if such a processing is repeated, the hardness however, not be increased infinitely, as there is a hardness limit gives. According to the actual wire drawing it is therefore subjected several times to an annealing process, so he can have the maximum hardness when the wire rod attained a desired diameter.

consequently becomes the thin starting material of the rod, which is a predetermined diameter, which by such a processing is obtained in a length of one with an eye cutting needle and one end of it with a press machine pressed flat and then an opening to be used as a spring opening educated. At this time only one end of the source material will be annealed, whereby a pressing of the same is allowed.

A method of forming the openings is as follows. As in 1a shown, first becomes a concave section 2 '' with a shape of a spring opening in the pressed end 1a a needle material 1 educated. The concave section 2 '' has a flat bottom and the depth thereof is about half the thickness of the end 1a ,

After that, the needle material becomes 1 turned around. The opposite side of the needle material is subjected to the pressing to the concave portion 2 '' to form, as in 1b shown. Thereafter, a hole is then penetrated or punched out in such a way that a passage opening 2 ' is formed ( 1c ).

Next, the location between the end face of the needle material 1 and the base of the opening 2 ' subjected to compression molding to along the length of the needle material 1 a thread exit trench 3 to build ( 1d ). At this time stand the projections 3a and 3b from both ends of the thread exit trench 3 out.

Next is a roughly triangular notch 4 with a base or an end surface of the Nadelma terials 1 formed by pressing ( 1e ). A thread entry opening 5 ( 1f ) is made by cutting the rod between the top of the notch 4 and the base of the opening 2 ' educated.

Consequently, pillars 6 , which provide a spring effect, on both sides of the opening 2 ' formed, with the opening 2 ' as a spring opening 2 acts. Then the needle material becomes 1 subjected to grinding such that the tips thereof become pointed, and the tips are then bent into a predetermined shape leading to an eyelet-made needle. When using this needle provided with an eye, the suture becomes 7 through the spring opening 2 introduced and the lead 3a from the side of the spring opening 2 the thread exit trench 3 prevents the suture thread 7 exit.

Since the above-described eye piercing needle is made of a thin needle material having a diameter of about 0.10-1.60, a microfabrication technique is used to form the spring hole 2 required in needle material. First, it is difficult to secure the thin needle material when processing the needle material. In addition, the eyeleted needle which provides a spring effect has a complicated structure of a needle base. In addition, although the use of austenitic stainless steel as a material for a sewing needle has been prevalent in recent years, this material can not be subjected to heat treatment to be cured. Therefore, a thick starting material is subjected to wire drawing to be a thin starting material, thereby changing from a crystal structure to a fibrous structure, and then hardened to obtain a desired hardness. When forming the spring opening 2 however, it must be selectively subjected to a heat treatment to soften, which enables it to be pressed and thus reduces the working efficiency.

With regard to such a problem, the spring opening 2 , the triangular notch 4 and others by a jet laser according to the above-described patent 1 educated. The attachment and machining can be easily performed when a laser beam is used. In addition, the softening is not required. Therefore, the work efficiency increases, which in turn reduces the manufacturing cost.

At the However, using a laser beam will surface rough and the hardness of the rod decreases due to the the laser treatment generated heat. Therefore, one is Preference is given to production by means of press work.

There a stainless steel needle with an eyelet Conventionally, SUS304 stainless steel was used. If an eyelet needle is made of SUS304, is it possible to solve such problems and the Spring opening of a needle provided with an eye to form by pressing.

SUMMARY OF THE INVENTION

However, the eye piercing needle made with SUS304 has the problem of column breakage. Column break is an event in which a pillar 6 breaks while a surgeon uses the eyed needle. While holding an eyelet-equipped needle with a needle holder, if a portion without spring opening 2 held, the column break are prevented. However, the sewing work can be easily performed by gripping one end of the eyelet-equipped needle. Therefore, when holding a portion of the spring opening 2 such a column break occur.

The The present invention is in view of mitigating such problems and the intent delivered, a column break-proof, with To provide an eyelet needle, in which an opening can be made by pressing.

To the Fulfilling the aforementioned task is a eyeleted needle of the present invention characterized in that it comprises a pair of resilient columns, which on one end of a raw material of stainless steel, which has a predetermined shape and a predetermined diameter, with 0.1 to 0.15 weight percent carbon, 8.00 to 10.00 weight percent Nickel, 17 to 20 weight percent chromium and ≤ 0.7 weight percent Manganese are formed, and contains a spring opening, which is formed between the pair of resilient columns.

The aforementioned needle can be provided with an eye with a tensile strength of 2000 N / mm or more and 5-fold extensibility or more.

To accomplish the above-described object, a method of manufacturing one having a The needle provided the following steps: forming the stainless steel containing 0.1 to 0.15 weight percent carbon, 8.00 to 10.00 weight percent nickel, 17 to 20 weight percent chromium, and ≤0.7 weight percent manganese in a predetermined diameter by wire drawing once or more, and forming a spring hole on one end of the needle material by pressing.

Of the Step to forming the stainless steel in the predetermined diameter can take a step to multiple wire drawing and a heat treatment included at least once between the wire drawing steps is performed. The heat treatment can be done in one Noble gas atmosphere can be performed. nitrogen or argon can be used as a noble gas.

To The present invention provides the use of a stainless Steel containing 0.1 to 0.15% by weight of carbon, 8.00 to 10.00 weight percent nickel, 17 to 20 weight percent chromium and ≤0.7 weight percent manganese excellent results, such as having a spring opening with ease can be prepared and fracture can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS

The 1a to 1f FIG. 13 is drawings explaining a process of forming a spring opening of an eyelet needle by press work. FIG.

BEST EMBODIMENT THE INVENTION

A Embodiment of the present invention will become prompt described.

When Preventive measure against column breakage considering the use of a SUS302 stainless steel drawn. As compared to SUS304 slightly higher salary on carbon in SUS302 increases its toughness, it is expected that the column break can be prevented.

Although the reason is not known, however, SUS302 stainless steel has a problem in forming an opening with a press. That is, in the in the 1b to 1c shown steps falls the portion of the through hole 2 ' not out, but stays on one side of the opening 2 ' appropriate.

As a result seriously investigating this event, focus the inventor to the somewhat different circumstances of the SUS302 stainless steel elements available.

stainless Steel contains carbon, sulfur, phosphorus, manganese, etc. Apart from chrome and nickel, the functions of this are Elements as follows.

chrome is an element which has a thin oxide layer on the Steel surface causes, thereby preventing that the same rusts, and is therefore for stainless steel indispensable. In addition, the inclusion of chromium improves the heat resistance and mechanical properties of stainless steel. Ferritization is also favored.

nickel is an element used to improve the mechanical properties is capable. A significant addition of nickel improved the heat resistance. The corrosion resistance increases when added with chromium. In addition, that too Austenitizing the alloy favors.

If As the carbon content decreases, the intercrystalline corrosion resistance decreases to. An application in a heating head is then possible. When the carbon content is increased, the mechanical Properties improved, but the corrosion resistance takes something off and makes the steel weak. That's why he is not suitable for the heating head. Austenitizing is favored.

Though improve sulfur and phosphorus cutting ability, but the addition of a large amount of them makes that Steel weak.

manganese is used to save nickel. A poison gas is generated during the manufacture and welding of manganese-containing stainless steel. As the thermoformability and cold formability are low, the rolling load is also large.

In view of the facts described above, test series for forming an opening in different types of stainless steel are performed in a varying ratio of element contents (all within the limits of SUS302), and the results are shown in Table 1. The method of forming an opening is the same as that described in the conventional working example. However, the manufacturing method of the needle material differs. Ie. the heat treatment (annealing) is carried out while the wire drawing according to the conventional working example is carried out either in ambient air or in a hydrogen atmosphere to improve the hardness of a raw material. On the other hand, the processing is carried out in an inert gas atmosphere according to the present invention. The inert gas can be either nitrogen or argon. However, the embodiment of the present invention uses argon. Argon and nitrogen are inert gases. Unlike nitrogen, argon is heavier than air. Therefore, a volatile metal can be prevented from evaporating from the stainless steel when the inside of a furnace is pressurized during a heat treatment. In addition, since hydrogen used by the conventional technology (SUS304 or the like) is not used for improving the hardness, hydrogen embrittlement of the raw material does not develop. Therefore, the column break is prevented. [Table 1] sample number C% by weight Si% by weight Mn% by weight P% by weight S weight% Ni% by weight Cr% by weight Outer diameter (mm) Opening formed? Tensile strength (N / mm) Elasticity (times) 1 0,110 0,400 0,580 0.028 0.001 8,090 18.090 0,810 O 2230 6 2 0,100 0,400 0,600 0.028 0.001 8,060 18.310 0.805 O 2250 6 3 0,110 0,420 0,820 0,030 0.001 8,050 18.220 0.707 x 1900 9 4 0,120 0,350 0,630 0.031 0.001 8,000 18.080 0.805 O 2200 7 5 0,120 0,350 0,630 0.031 0.001 8,000 18.080 1,010 O 2120 7 6 0,110 0.410 0,570 0,029 0.001 8,220 18.120 1,104 O 2080 5 7 0,100 0,470 0.720 0,029 0.001 8,120 18.080 0,810 Δ 1960 8th 8th 0,100 0,400 0,600 0.028 0.001 8,060 18.310 0.709 O 2320 6

To Table 1 in the sample 3, no opening is formed. In sample 7, although in some cases openings formed, but there are also many other cases in which no opening is formed. In the other samples will be the openings formed successfully.

It An attempt was made to measure the differences between the samples 3, 7 and the other evaluate. In particular, it was regarding of carbon, silicon, phosphorus and sulfur no difference detected. However, a difference in manganese content is detected. The manganese content of the sample 3 is 0.820 wt .-% and the Manganese content of Sample 7 is 0.720 wt% while those of all other samples are less than 0.70% by weight. moreover For example, as described above, manganese has the property that the hot workability and cold workability deteriorates and the rolling load becomes too large as the manganese content increases. From the before mentioned facts is obvious that the spring opening 2 can be formed by pressing, if the manganese content less is 0.70% by weight.

At the same time, the inventor of the present invention has suggested that the greater the tensile strength of the starting material (the higher the hardness thereof) and the lower the tackiness thereof, the easier it is to form an opening. Then, the tensile strength comparison of respective samples based on it stated that the tensile strength of each sample is affected by the outer diameter. According to this comparison, the sample 1 has 2230 N / mm, the sample 2 2250 N / mm, the sample 3 1900 N / mm, the sample 4 2200 N / mm and the sample 5 2120 N / mm, the sample 6 2080 N. / mm, the sample 7 1960 N / mm and the sample 8 2320 N / mm. It is obvious that the manganese content and the ease of forming an opening correspond to the tensile strength (the lower the tensile strength, the higher the manganese content and the more difficult it is to form an opening), though there is a difference in outer diameter.

These In fact, an opening is easily formed can if the tensile strength is 2000 N / mm or more.

To the Examining the difficulty of columnar fracture is called next run a stretch test, which is an examination of how often the starting material Centering on the middle part repeatedly bent in 90 degrees until it breaks, with one end of each stock sample 1 to 8 is held. Results of this test showed six times with samples 1, 2 and 8 and nine times with sample 3, seven times with samples 4 and 5 and 5 times with sample 6, and 8 times with the sample 7. It is known that sewing needles with a triple extensibility or more, preferably 5-fold or more, hard to break, which meets the market requirement. At the same time, they are expected to be in terms of column usage should be hard to break. The exam proves that all samples 1-8 have sufficient extensibility, to meet the requirement. One with an eye provided needle with preferably a 5-fold extensibility or more, according to the present invention, is difficult in terms of column breakage to break.

each the aforementioned tests is for opposite properties (tensile strength vs. ductility). Each of the tests proves that one with an eye provided needle with a tensile strength of 2000 N / mm or more and a 5-fold extensibility or more easy formation of an opening allows and in relation to column break hard too break is.

The method of forming an opening of the embodiment described above is not the same as in FIG 1 shown limited method. For example, the opening 2 ' without forming the thread exit trench 3 and the concave section 2 '' by pressing in step 1 and forming the concave portion 2 '' be formed by punching out of a page in one part.

The The present invention relates to an eyelet Needle. However, she is on a variety of medical instruments applicable, which are made by pressing the SUS302 stainless steel.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - JP 2706677 [0004]

Claims (5)

Eyelet needle, comprising: one Pair of resilient columns on one end of a source material stainless steel, which has a predetermined shape and a predetermined Diameter, with a carbon content of 0.1 to 0.15 Wt .-%, a nickel content of 8.00 to 10.00 wt .-%, a chromium content from 17 to 20 wt% and a manganese content of ≤ 0.7 wt%; and a spring opening, which between the pair resilient columns is formed. With an eye provided needle according to claim 1, wherein the tensile strength is 2000 N / mm or more and the ductility 5 times or more. Method of making an eyelet provided needle, comprising the following steps: Form a stainless steel with a carbon content of 0.1 to 0.15 wt .-%, a nickel content of 8.00 to 10.00 wt .-%, a Chromium content of 17 to 20 wt .-% and a manganese content of ≤ 0.7 Wt .-% in a predetermined diameter by a single or multiple wire drawing and forming a spring opening one end of the needle material by pressing. Method of making an eyelet The needle according to claim 3, wherein the step of forming the stainless steel in the predetermined diameter the following Has steps: two or more wire drawing and Perform a heat treatment at least once between the steps of wire drawing. Method of making an eyelet The needle according to claim 4, wherein the step of performing the heat treatment either in a nitrogen atmosphere or argon atmosphere is performed.