201240639 六、發明說明： 【發明所屬之技術領域】 本發明，是關於例如在外科手術所使用的縫合針》 【先前技術】 作爲諸如在外科手術所使用的縫合針，應該提昇對身 體組織的刺入性，本案申請人，曾提案有：例如於日本特 開2000- 1 3993 1號所揭示之將針本體的斷面形狀設成多角 形的縫合針、或是例如於日本特開2007-268136號所揭示 之在針本體之周面相對向位置上，於長度方向形成凹溝部 的縫合針。 此等縫合針，在對身體組織刺入時，藉由減少與所刺 入之部位（身體組織）的接觸面積而降低刺入抵抗，因此 ，不易造成對身體組織之負荷而能夠進行良好的縫合作業 [先前技術文獻] [專利文獻1] 日本特開2000-139931號公報 [專利文獻2] 日本特開2007-268136號公報 【發明內容】 [發明所欲解決之問題] 本發明者，對於此等縫合針更加以反覆硏究與實驗， 其結果終於開發出可發揮以往所沒有之作用效果之創新的 201240639 縫合針。 [發明解決問題之技術手段] 以下參照添附圖面說明本發明之要旨。 一種縫合針，其特徵爲：於針本體1之尖端部位的左 右側部設有凹凸部，且該凹凸部的緣部是被設定成小刃部 6、7 〇 又，如申請專利範圍第1項之縫合針，其中上述小刃 部6、7是被設置於上述凹凸部之凸部4、5的緣部。 又，如申請專利範圍第2項之縫合針，其中上述凸部 4、5是在針本體1的長度方向設有複數個。 又，如申請專利範圍第1至3項中之任一項所述的縫 合針，其中上述針本體1的尖端部位是構成爲斷面三角形 狀，且在該斷面三角形狀之尖端部位的左右側緣2、3分 別設有上述凹凸部。 又，一種縫合針，其特徵爲：在針本體1之尖端部位 的左右側部設有凸部4、5，且該左右之凸部4、5其個別 的緣部是被設定成小刃部6、7。 又，如申請專利範圍第5項之縫合針，其中左右之上 述凸部4、5分別設有複數個。 又，如申請專利範圍第5或6項之縫合針，其中左右 之上述凸部4、5分別在上述針本體1的長度方向並列設 置複數個。 又，如申請專利範圍第5項之縫合針，其中於上述針 -6- 201240639 本體1之尖端部位的左右側部，設有：延伸設置於上述針 本體1之長度方向的直線狀峰部2、3，並分別於該峰部2 、3設有上述凸部4、5。 又，如申請專利範圍第6項之縫合針，其中於上述針 本體1之尖端部位的左右側部，設有：延伸設置於上述針 本體1之長度方向的直線狀峰部2、3，並分別於該峰部2 、3設有上述凸部4、5。 又，如申請專利範圍第7項之縫合針，其中於上述針 本體1之尖端部位的左右側部，設有：延伸設置於上述針 本體1之長度方向的直線狀峰部2、3，並分別於該峰部2 、3設有上述凸部4、5。 又，如申請專利範圍第1至3項中之任一項所述的縫 合針，其中上述針本體1是從尖端至基端形成凹彎曲狀。 又，如申請專利範圍第4項之縫合針，其中上述針本 體1是從尖端至基端形成凹彎曲狀。 . 又，如申請專利範圍第5或6項之縫合針，其中上述 針本體1是從尖端至基端形成凹彎曲狀。 又，如申請專利範圍第7項之縫合針，其中上述針本 體1是從尖端至基端形成凹彎曲狀。 又，如申請專利範圍第8或9項之縫合針，其中上述 針本體1是從尖端至基端形成凹彎曲狀。 又，如申請專利範圍第1 〇項之縫合針，其中上述針 本體1是從尖端至基端形成凹彎曲狀。 201240639 [發明效果] 本發明由於如上述般地構成，故例如能夠儘可能地降 低對身體組織刺入時的刺入抵抗，成爲不易造成對身體組 織之負荷而能夠進行良好的縫合等，爲可發揮以往所沒有 之作用效果之嶄新的縫合針。 【實施方式】 以下簡單地說明可適切於本發明的實施形態並依據圖 面顯示本發明的作用。 在對身體組織刺入時，利用由設於左右側部之凹凸部 的緣部所形成的小刃部6、7而可銳利地切入身體組織， 儘可能地降低刺入身體組織時的刺入抵抗。對於此點可藉 由後述的刺入性能比較測試而得到確認。 因此，本發明可儘可能地降低對身體組織剌入開始時 的刺入抵抗，並以此爲契機，進而亦使其後之位於基端側 部位的刺入可以圓滑地進行，因此，不易造成對身體組織 之負荷而能夠進行良好的縫合作業。 [實施例1] 對於本發明之具體的實施例1依據圖面說明如下。 本實施例，爲在外科手術所使用的縫合針。 具體而言，針本體1，如第1圖所圖示’是將適當的 金屬製直線棒狀構件予以凹彎曲形成者’並於其尖端設有 尖銳部la，於基端設有可使縫合線T嵌插連結之斷面爲 - 8 - 201240639 圓形狀的連結部1 b (孔部）。 又’針本體1的全長（直線棒狀構件的長度）約 13mm’並在形成後述之凸部4、5或斷面多角形狀部之後 ，進行凹彎曲而形成。 又’針本體1，如第1圖所圖示，係形成有斷面多角 形狀部。 在本實施例中，該斷面多角形狀部是將形狀不同的斷 面多角形狀部並列設置於針本體1的長度方向而構成，具 體而言，於針本體1的上表面（凹彎曲形成之後的內面） ，以從該針本體1的尖端至基端側預定位置P3之間所形 成的平坦面爲基準，形成有各斷面多角形狀部，是由：設 在從針本體1的尖端至基端側預定位置Pl(從尖端約 3mm位置）之間的斷面三角形狀部、及設在比該斷面三 角形狀部更靠近基端側（從基端側預定位置P 1至基端側 預定位置P2(離尖端約4.5mm位置）之間）的斷面五角 形狀部（基部形狀）、及設在比該斷面五角形狀部更靠近 基端側（從基端側預定位置P2至基端側預定位置P3 (離 尖端約10.5mm )之間）的斷面四角形狀部_.、以及設在比 該斷面四角形狀部更靠近基端側（從基端側預定位置P3 至基端之間〉的斷面圓形狀部所構成。 由此構成下，再於從針本體1的尖端至基端側預定位 置P3爲止之左右側部的上表面側.，設有··延伸設置於針 本體1的長度方向並具有預定長度的先銳角緣2、3(峰 部）。 -9- 201240639 又’位於該斷面多角形狀部（斷面三角形狀部、斷面 五角形狀部、以及斷面四角形狀部）之角緣彼此間的面係 以形成爲凹狀面亦佳，不過實際上，於斷面三角形狀部的 左右側面部乃設有後述之凹溝部8，並形成爲特殊形狀的 斷面三角形狀。 又’於針本體1之尖贿部{ii的左右側部設有凹凸部， 該凹凸部的緣部是被設定成小刃部6、7。 具體而言，該小刃部6、7，是如第1〜6圖所圖示， 在該針本體1之尖端部位（斷面三角形狀部）的左右側部 所形成的各個峰部2、3(角緣）上設有複數個凸部4、5 ，並使該各個凸部4、5的緣部設定成小刃部6、7，因此 ，小刃部6、7是複數個並列設置在針本體1的長度方向 〇 也就是說，於針本體1的左右側部形成有凹凸部，而 位在各凸部4、5之針本體1之尖端側的緣部是被設定成 小刃部6、7。 其次，對於在該針本體1之尖端部位的左右側部所設 置之小刃部6、7的製造方法加以說明。 首先，如第7、8圖所圖示，將直線棒狀構件之斷面 圓形狀的部位10予以沖壓而形成斷面四角形狀的部位11 ，接著，如第9圖所圖示，將該斷面四角形狀的部位11 予以切削而形成斷面五角形狀的部位1 2。 然後，如第10圖所圖示，以上下模具13A、13B將 該斷面五角形狀的部位1 2予以沖壓而於左右側部設置凹 -10- 201240639 溝部8，並且在左右側部的上方位置設置凸部4、5。該凹 溝部8是利用膨出形成於下模具13A之左右部位的角狀 凸部13 b所形成，凸部4、5分別是利用凹設於下模具 13A的圓弧狀凹部13a所形成。該圓弧狀凹部13a是複數 個並列設置於下模具13A的長度方向，並藉由設置在該 圓弧狀凹部13a彼此之間之沒有圖示出的圓弧狀凸部而於 設置在針本體1之左右側部的各凸部4、5彼此間形成凹 部（亦包含構成凹溝部8的凹部）。 接著，如第11圖所圖示，當切削斷面三角形狀之部 位12的上部分時，於斷面三角形狀的部位12,設有：延 伸設置於該斷面三角形狀之部位12的長度方向並具有預 定長度之直線狀的峰部2、3(角緣），於該峰部2、3分 別設有凸部4、5，並藉由該各個凸部4、5的緣部形成小 刃部6、7。 又，作爲小刃部6、7，是於針本體1之尖端部位的 左右側部，在複數個凹部中夾介間隔而設置，以將該凹部 間之部分的緣部設定成小刃部6、7之方式亦可。 又，本實施例，是如前述般地，於針本體1之尖端部 位的左右側部，使直線狀的凹溝部8設於該針本體1的長 度方向。又，凹溝部8是以各設置有複數個之方式來實施 亦可。 藉由設置有該凹溝部8，例如在將已刺入於身體組織 的針本體1抽拔時，藉由該凹溝部8由於可以減少與身體 組織的接觸面積，因此可以儘可能地減少相對於該身體組 -11 - 201240639 織的刺入抵抗與抽拔抵抗。 本實施例由於如上述般地構成，藉由在該針本體1之 尖端部位的左右側部設置複數個凸部4、5並設置複數個 小刃部6、7，例如在刺入身體組織時，便可藉由該凸部4 、5的小刃部6、7銳利且斷續地切入身體組織’其結果 ，可以儘可能地減少刺入身體組織時的刺入抵抗。亦即， 藉由分別複數地設置該凸部4、5並具有複數個小刃部6 、7，該針本體1之尖端部的左右側部在刺入於身體組織 時並不是定常地進行連續切入，而是利用進行斷續性地切 入來達成良好的刺入。 本申請人，藉由實驗確認儘可能地降低前述的刺入抵 抗。 亦即，如於第12圖所圖示，準備本實施例中之該構 造（於針本體1之尖端部位的左右側部設置有凸部4、5 的構造）之實驗體1、以及如於第13圖所圖示之於針本 體1之尖端部位的左右側部不具備有凸部4、5的實驗體 2，進行了此兩者的刺入性能比較實驗。 該刺入性能比較實驗，是將實驗體1及實驗體2以相 同的壓力對相同之被刺入構件進行刺入時，測量所產生之 摩擦抵抗値的比較實驗，其結果由第14圖所圖示之曲線 圖所顯示。又，曲線圖之橫軸是距離實驗體1及實驗體2 之尖端的長度（mm )，縱軸是對被刺入構件進行刺入時 所產生的摩擦抵抗値（N )。 圖表中的黑線是顯示實驗體1，白線是顯示實驗體2 -12- 201240639 ，由該曲線圖來看，實驗體1相較於實驗體2,從距離針 本體1的尖端到設置最初凸部4、5之約0.6mm的位置到 設置最後凸部4、5之約2.5mm的位置之間的摩擦抵抗値 較低。且可能起因於由於通過設置有該凸部4、5的位置 致使刺入抵抗較低之緣故，使得位於其後之部位的摩擦抵 抗値也較低。 由以上，藉由此實驗可得知在針本體1之尖端部位的 左右側部設置凸部4、5(小刃部6、7)是極其有效的。 因此，依據本實施例，特別是對身體組織之刺入開始時， 在承受抵抗之作爲針本體1尖端部位的左右側部處的刺入 抵抗可儘可能地被減低，以此爲開端，使得位於其後之針 本體1之基端側部位的刺入也能夠圓滑地進行，因此，不 易造成對身體組織之負荷而能夠進行良好的縫合作業。 又，本實施例，由於是在針本體1之尖端部位的左右 側部，使凹溝部8設置於針本體1的長度方向，由於藉由 該凹溝部8的存在也可以減少與身體組織的接觸面積，因 而能夠儘可能地降低對該身體組織的刺入抵抗。 又，本實施例，是在針本體1形成有斷面多角形狀部 ，藉由位在該斷面多角形狀部的角緣，可銳利地切入身體 組織，故刺入到身體組織時的剌入抵抗，會儘可能地降低 〇 又，在本實施例中之斷面多角形狀部，由於是將形狀 不同的斷面多角形狀部並排設置於針本體1的長度方向來 構成，故在刺入途中之際，可藉由使形狀變化而產生切入 -13- 201240639 作用’所以可以儘可能地降低刺入於身體組織時的刺入抵 抗。 具體而言，本實施例，其斷面多角形狀部，由於是藉 由：設於針本體1之尖端側的斷面三角形狀部、以及設於 比該斷面三角形狀部更靠近基端側的斷面五角形狀部與斷 面四角形狀部所構成，故在刺入途中之際，可藉由使角的 數目改變的形狀變化而產生切入作用，因而可以儘可能地 降低刺入於身體組織時的刺入抵抗。 [實施例2] 對於本發明之具體的實施例2依據圖面說明如下。 本實施例，是除了在針本體1的左右側部設置凸部4 、5及小刃部6、7之外，在針本體1的尖端部，於斷面 三角形狀部的外面部（下面部）亦設置有凹凸部，且該凹 凸部的緣部是被設定成小刃部15。 在具體上，該小刃部15，如第15圖所圖示，是在該 針本體1之尖端部（斷面三角形狀部）的外面部所形成的 峰部16 (角緣）處，朝向針本體1的軸心方向設置複數 個凹部14，並使該凹部14的緣部設定成凸狀的小刃部15 ，且小刃部15是複數個並列設置於針本體1的長度方向 〇 該凹部14是與前述之左右側部的凸部4、5同樣地’ 可以是藉由沖壓而形成，也可以是藉由切削而形成。又’ 本發明，並非局限於實施例1、2者’各構成要件之具體 -14- 201240639 上的構成，是可以適當地予以設計的。 【圖式簡單說明】 第1圖是顯示實施例1的立體圖。 第2圖是實施例1中之要部的平面圖。 第3圖是第2圖的A-A斷面圖。 第4圖是第2圖的B-B斷面圖。 第5圖是實施例1之要部的底面圖。 第6圖是實施例1之要部的側面圖。 第7圖是實施例1之製造方法的說明圖。 第8圖是實施例1之製造方法的說明圖。 第9圖是實施例1之製造方法的說明圖。 第1 〇圖是實施例1之製造方法的說明圖。 第11圖是實施例1之製造方法的說明圖。 第12圖是實驗體1之要部的平面圖。 第13圖是實驗體2之要部的平面圖。 第1 4圖是顯示實驗體1及實驗體2之刺入性能比較 實驗之結果的曲線圖。 第1 5圖是實施例2之要部的側面圖。 【主要元件符號說明】 1 :針本體 la :尖銳部 1 b :連結部 -15- 201240639 2、3 :峰部 4、5 :凸部 6、7 :小刃部 8 :凹溝部 1 0 :斷面圓形狀部位 1 1 :斷面四角形狀部位 1 2 :斷面五角形狀部位 1 3 A :下模具 1 3 B :上模具 13a :圓弧狀凹部 13b :角狀凸部 P1、P2、P3:(離尖端不同距離的）基端側預定位置 T :縫合線 -16-201240639 VI. Description of the Invention: [Technical Field] The present invention relates to a suture needle used, for example, in a surgical operation. [Prior Art] As a suture needle used in a surgical operation, a thorn to a body tissue should be promoted. In the case of the applicant of the present application, a suture needle having a cross-sectional shape of the needle body as a polygonal shape disclosed in Japanese Laid-Open Patent Publication No. 2000-13993, or, for example, Japanese Patent Laid-Open No. 2007-268136 The suture needle in which the groove portion is formed in the longitudinal direction at a position opposite to the circumferential surface of the needle body is disclosed. These suture needles reduce the penetration resistance by reducing the contact area with the penetrated portion (body tissue) when the body tissue is inserted, so that it is less likely to cause a load on the body tissue and can be well stitched. [Problems to be Solved by the Invention] The present inventors regard this problem. [Patent Document 1] JP-A-2000-139931 (Patent Document 2) JP-A-2007-268136 [Patent Document] The suture needles have been repeatedly researched and tested, and the results have finally developed an innovative 201240639 suture needle that can exert the effects that have not been used before. [Technical means for solving the problem] The gist of the present invention will be described below with reference to the accompanying drawings. A suture needle characterized in that: the left and right side portions of the tip end portion of the needle body 1 are provided with a concavo-convex portion, and the edge portion of the concavo-convex portion is set to the small blade portion 6, 7 and, as in the patent application, the first The suture needle of the item, wherein the small blade portions 6, 7 are provided at edges of the convex portions 4, 5 of the uneven portion. Further, in the suture needle according to the second aspect of the invention, the convex portions 4 and 5 are provided in plural in the longitudinal direction of the needle body 1. The suture needle according to any one of claims 1 to 3, wherein the tip end portion of the needle body 1 is formed in a triangular cross section and is at the tip end portion of the triangular shape of the cross section. The side edges 2, 3 are respectively provided with the above-mentioned uneven portions. Further, a suture needle is characterized in that convex portions 4 and 5 are provided on the left and right side portions of the tip end portion of the needle body 1, and the individual edge portions of the left and right convex portions 4 and 5 are set as small blade portions. 6, 7. Further, as for the suture needle of the fifth aspect of the patent application, the plurality of convex portions 4 and 5 on the left and right sides are respectively provided in plural numbers. Further, in the suture needle of the fifth or sixth aspect of the invention, the convex portions 4 and 5 on the right and left sides are respectively arranged in parallel in the longitudinal direction of the needle body 1. Further, in the suture needle of the fifth aspect of the invention, wherein the left and right side portions of the tip end portion of the body of the needle -6-201240639 are provided with a linear peak portion 2 extending in the longitudinal direction of the needle body 1 And 3, and the convex portions 4 and 5 are provided in the peak portions 2 and 3, respectively. Further, the suture needle according to the sixth aspect of the invention, wherein the left and right side portions of the tip end portion of the needle body 1 are provided with linear peak portions 2 and 3 extending in the longitudinal direction of the needle body 1, and The convex portions 4 and 5 are provided in the peak portions 2 and 3, respectively. Further, in the suture needle according to the seventh aspect of the invention, the left and right side portions of the tip end portion of the needle body 1 are provided with linear peak portions 2 and 3 extending in the longitudinal direction of the needle body 1, and The convex portions 4 and 5 are provided in the peak portions 2 and 3, respectively. The sewing needle according to any one of claims 1 to 3, wherein the needle body 1 is formed in a concave curved shape from the tip end to the base end. Further, the suture needle of claim 4, wherein the needle body 1 is formed in a concave curved shape from the tip end to the base end. Further, the suture needle of claim 5 or 6, wherein the needle body 1 is formed in a concave curved shape from the tip end to the base end. Further, the suture needle of claim 7, wherein the needle body 1 is formed in a concave curved shape from the tip end to the base end. Further, the suture needle of claim 8 or 9, wherein the needle body 1 is formed in a concave curved shape from the tip end to the base end. Further, the suture needle of the first aspect of the invention, wherein the needle body 1 is formed in a concave curved shape from the tip end to the base end. 201240639 [Effect of the Invention] The present invention is configured as described above. Therefore, for example, it is possible to reduce the penetration resistance against the body tissue as much as possible, and it is possible to perform a good suturing or the like without causing a load on the body tissue. A new suture needle that has no effect in the past. [Embodiment] Hereinafter, embodiments of the present invention will be briefly described, and the effects of the present invention will be shown in accordance with the drawings. When the body tissue is inserted, the small blade portions 6 and 7 formed by the edge portions of the concave and convex portions provided on the left and right side portions can be sharply cut into the body tissue to minimize the penetration of the body tissue. resistance. This point can be confirmed by the penetration performance comparison test described later. Therefore, the present invention can reduce the penetration resistance at the beginning of the intrusion of the body tissue as much as possible, and as a result, the piercing of the posterior portion at the proximal end side can be smoothly performed, and therefore, it is not easy to cause A good suturing operation can be performed on the load of the body tissue. [Embodiment 1] A specific embodiment 1 of the present invention will be described below with reference to the drawings. This embodiment is a suture needle used in surgery. Specifically, the needle body 1 is formed by bending a suitable metal linear rod-shaped member as shown in FIG. 1 and having a sharp portion 1a at its tip end, and is provided at the base end to be sutured. The cross section of the line T insertion joint is - 8 - 201240639 The circular connection portion 1 b (hole portion). Further, the entire length of the needle main body 1 (the length of the linear rod-shaped member) is about 13 mm', and is formed by concave bending after forming the convex portions 4 and 5 or the polygonal polygonal portion to be described later. Further, the needle main body 1 is formed with a polygonal portion having a cross section as illustrated in Fig. 1 . In the present embodiment, the cross-sectional polygonal portion is formed by juxtaposing the polygonal cross-sectional portions having different shapes in the longitudinal direction of the needle body 1, specifically, on the upper surface of the needle body 1 (after the concave bending is formed) The inner surface of the needle body 1 is formed with a polygonal portion of each cross section based on a flat surface formed between the tip end of the needle body 1 and the predetermined position P3 on the proximal end side, and is provided at the tip end of the needle body 1 a triangular cross-sectional shape portion between the predetermined position P1 on the proximal end side (about 3 mm from the tip end) and a proximal end side closer to the triangular shaped portion of the cross-section (a predetermined position P 1 from the proximal end side to the proximal end) a cross-sectional pentagon portion (base shape) between the side predetermined position P2 (between about 4.5 mm from the tip end) and a proximal end side of the pentagon-shaped portion of the cross-section (from the base end side predetermined position P2 to a cross-sectional quadrangular shape portion of the base end side predetermined position P3 (between the tip end and about 10.5 mm) is disposed closer to the base end side than the quadrangular shape portion of the cross-section (from the base end side predetermined position P3 to the base) The cross-sectional shape of the section between the ends is formed. The upper surface side of the right and left side portions from the tip end of the needle body 1 to the predetermined position P3 on the proximal end side is provided with an acute angle 2, 3 extending in the longitudinal direction of the needle body 1 and having a predetermined length ( -9- 201240639 - The surface between the corners of the polygonal portion (the triangular portion of the cross section, the pentagon portion of the cross section In addition, in the left and right side surface portions of the triangular portion of the cross section, a groove portion 8 to be described later is provided, and a triangular shape having a special shape is formed. Further, the tip portion of the needle body 1 is {ii The left and right side portions are provided with concavo-convex portions, and the edge portions of the concavo-convex portions are set as the small blade portions 6 and 7. Specifically, the small blade portions 6 and 7 are as shown in Figs. 1 to 6 a plurality of convex portions 4 and 5 are provided on each of the peak portions 2 and 3 (corner edges) formed on the right and left side portions of the tip end portion (triangular shape portion) of the needle body 1, and the respective convex portions 4 and Since the edge portion of 5 is set to the small blade portions 6, 7, the small blade portions 6, 7 are plurally arranged side by side in the length of the needle body 1. That is, the concave and convex portions are formed on the left and right side portions of the needle body 1, and the edge portions on the tip end side of the needle body 1 of each of the convex portions 4 and 5 are set as the small blade portions 6, 7. A method of manufacturing the small blade portions 6 and 7 provided at the left and right side portions of the tip end portion of the needle body 1 will be described. First, as shown in Figs. 7 and 8, the cross-sectional circular shape of the linear rod-shaped member is described. The portion 10 is pressed to form a portion 11 having a quadrangular cross section, and then, as shown in Fig. 9, the portion 11 having the quadrangular shape of the cross section is cut to form a portion 1 2 having a pentagon shape. As shown in Fig. 10, the upper and lower molds 13A and 13B press the portion 1 2 having a pentagonal cross section, and the concave portion -10-201240639 groove portion 8 is provided on the right and left side portions, and the convex portion is provided at the upper side of the left and right side portions. 4, 5. The groove portion 8 is formed by an angular convex portion 13b which is formed in the left and right portions of the lower mold 13A by bulging, and the convex portions 4, 5 are formed by arc-shaped concave portions 13a recessed in the lower mold 13A, respectively. The arc-shaped recessed portion 13a is provided in a plurality of rows in the longitudinal direction of the lower mold 13A, and is provided on the needle body by an arc-shaped convex portion that is not provided between the arcuate recessed portions 13a. Each of the convex portions 4 and 5 on the right and left side portions of the first portion has a concave portion (including a concave portion constituting the concave groove portion 8). Next, as shown in Fig. 11, when the upper portion of the triangular portion 12 of the cross section is cut, the portion 12 having the triangular cross section is provided with a longitudinal direction extending from the portion 12 of the triangular shape of the cross section. And having linear peaks 2 and 3 (corner edges) having a predetermined length, and convex portions 4 and 5 are respectively provided in the peak portions 2 and 3, and small edges are formed by edges of the respective convex portions 4 and 5. Department 6,7. Further, the small blade portions 6 and 7 are provided at right and left side portions of the tip end portion of the needle body 1, and are provided at intervals in a plurality of concave portions, and the edge portion of the portion between the concave portions is set as the small blade portion 6 The method of 7 can also be used. Further, in the present embodiment, as described above, the linear groove portion 8 is provided in the longitudinal direction of the needle body 1 at the left and right side portions of the tip end portion of the needle body 1. Further, the groove portion 8 may be implemented in a plurality of ways. By providing the groove portion 8, for example, when the needle body 1 that has been inserted into the body tissue is pulled out, since the groove portion 8 can reduce the contact area with the body tissue, it is possible to reduce as much as possible relative to The body group -11 - 201240639 woven piercing resistance and extraction resistance. In the present embodiment, as described above, a plurality of convex portions 4, 5 are provided on the right and left side portions of the tip end portion of the needle body 1, and a plurality of small blade portions 6, 7 are provided, for example, when piercing body tissues. By cutting the body tissue sharply and intermittently by the small blade portions 6, 7 of the convex portions 4, 5, as a result, the penetration resistance when piercing the body tissue can be reduced as much as possible. That is, by providing the convex portions 4, 5 in plural and having a plurality of small blade portions 6, 7, the left and right side portions of the tip end portion of the needle body 1 are not continuously continuous when they are inserted into body tissues. Cut in, but use intermittent cuts to achieve good penetration. The Applicant confirmed by experimentation that the aforementioned penetration resistance was reduced as much as possible. In other words, as shown in Fig. 12, the test body 1 of the structure (the structure in which the convex portions 4 and 5 are provided on the right and left side portions of the tip end portion of the needle body 1) in the present embodiment is prepared as well as The left and right side portions of the distal end portion of the needle body 1 shown in Fig. 13 were not provided with the experimental body 2 having the convex portions 4 and 5, and the penetration performance comparison experiments between the two were performed. This penetration performance comparison experiment is a comparative experiment in which the frictional resistance enthalpy generated by the test body 1 and the test body 2 when the same piercing member is pierced at the same pressure, and the result is shown in Fig. 14. The graph shown is shown. Further, the horizontal axis of the graph is the length (mm) from the tip end of the test body 1 and the test body 2, and the vertical axis is the frictional resistance 値(N) generated when the pierced member is pierced. The black line in the graph shows the experimental body 1, and the white line shows the experimental body 2 -12-201240639. From the graph, the experimental body 1 is compared with the experimental body 2, from the tip of the needle body 1 to the initial convexity. The frictional resistance 之间 between the positions of about 0.6 mm of the portions 4 and 5 to the position where the final projections 4 and 5 are set to about 2.5 mm is low. It may also be caused by a lower resistance to penetration due to the position where the projections 4, 5 are provided, so that the frictional resistance at the subsequent portion is also low. From the above, it has been found from the experiment that it is extremely effective to provide the convex portions 4, 5 (small blade portions 6, 7) on the right and left side portions of the tip end portion of the needle body 1. Therefore, according to the present embodiment, particularly at the start of the piercing of the body tissue, the piercing resistance at the left and right side portions as the tip end portion of the needle body 1 which withstand the resistance can be reduced as much as possible, thereby making the opening end The piercing of the proximal end portion of the needle body 1 at the rear can also be performed smoothly, so that it is less likely to cause a load on the body tissue and a good sewing operation can be performed. Further, in the present embodiment, since the groove portion 8 is provided in the longitudinal direction of the needle body 1 at the left and right side portions of the tip end portion of the needle body 1, the contact with the body tissue can be reduced by the presence of the groove portion 8. The area is thus able to reduce the penetration resistance to the body tissue as much as possible. Further, in the present embodiment, the needle main body 1 is formed with a polygonal portion having a cross section, and the corner portion of the polygonal portion of the cross section can be sharply cut into the body tissue, so that the penetration into the body tissue is caused. The resistance is reduced as much as possible. In the polygonal polygonal shape portion of the present embodiment, since the polygonal polygonal shaped portions having different shapes are arranged side by side in the longitudinal direction of the needle body 1, the piercing is performed on the way. At the same time, the cut-in -13-201240639 effect can be produced by changing the shape, so that the penetration resistance when piercing the body tissue can be reduced as much as possible. Specifically, in the present embodiment, the cross-sectional polygonal portion is provided on the tip end side of the needle main body 1 and the proximal end side of the cross-sectional triangular portion. Since the pentagon shape portion and the four-corner shape portion of the cross-section are formed, the cutting effect can be generated by changing the shape of the number of corners during the penetration, so that the penetration into the body tissue can be reduced as much as possible. The piercing resistance. [Embodiment 2] A specific embodiment 2 of the present invention will be described below with reference to the drawings. In the present embodiment, in addition to the convex portions 4 and 5 and the small blade portions 6, 7 provided on the right and left side portions of the needle body 1, the tip end portion of the needle body 1 is formed on the outer surface portion of the triangular portion of the cross section (lower portion) The uneven portion is also provided, and the edge portion of the uneven portion is set to the small blade portion 15. Specifically, the small blade portion 15 is at the peak portion 16 (corner edge) formed at the outer surface portion of the tip end portion (triangular shape portion) of the needle body 1 as illustrated in Fig. 15 A plurality of concave portions 14 are provided in the axial direction of the needle body 1, and the edge portion of the concave portion 14 is set to a convex small blade portion 15, and the small blade portion 15 is plurally arranged in parallel in the longitudinal direction of the needle body 1. The concave portion 14 may be formed by pressing similarly to the convex portions 4 and 5 on the left and right side portions described above, or may be formed by cutting. Further, the present invention is not limited to the configuration of the specific constituent elements of the first and second embodiments, and can be appropriately designed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a first embodiment. Fig. 2 is a plan view of the essential part in the first embodiment. Fig. 3 is a cross-sectional view taken along line A-A of Fig. 2. Fig. 4 is a cross-sectional view taken along line B-B of Fig. 2. Fig. 5 is a bottom plan view of the essential part of the first embodiment. Fig. 6 is a side view of the essential part of the first embodiment. Fig. 7 is an explanatory view showing a manufacturing method of the first embodiment. Fig. 8 is an explanatory view showing a manufacturing method of the first embodiment. Fig. 9 is an explanatory view showing a manufacturing method of the first embodiment. Fig. 1 is an explanatory view showing a manufacturing method of the first embodiment. Fig. 11 is an explanatory view showing a manufacturing method of the first embodiment. Fig. 12 is a plan view of the essential part of the experimental body 1. Figure 13 is a plan view of the main part of the experimental body 2. Fig. 14 is a graph showing the results of a comparison test of the penetration performance of the test body 1 and the test body 2. Fig. 15 is a side view showing the essential part of the second embodiment. [Description of main component symbols] 1 : Needle body la: Sharp part 1 b : Connection part -15- 201240639 2, 3: Peak part 4, 5: convex part 6, 7: Small blade part 8: Groove part 1 0: Broken The circular shape portion 1 1 : the cross-sectional shape portion 1 2 : the cross-sectional pentagon portion 1 3 A : the lower mold 1 3 B : the upper mold 13 a : the arc-shaped concave portion 13 b : the angular convex portions P1 , P2 , P3 : The base end side predetermined position T (different distance from the tip) T: suture-16-