JP3811913B2

JP3811913B2 - Method for manufacturing surgical suture needle

Info

Publication number: JP3811913B2
Application number: JP2000179155A
Authority: JP
Inventors: 郁夫秋山
Original assignee: AKIYAMA MEDICAL CO., LTD.
Current assignee: AKIYAMA MEDICAL CO., LTD.
Priority date: 2000-05-10
Filing date: 2000-05-10
Publication date: 2006-08-23
Anticipated expiration: 2020-05-10
Also published as: JP2001321881A

Description

【０００１】
【発明の属する技術分野】
本発明は各種の手術に使用する手術用縫合針の製造方法に関する。
【０００２】
【従来の技術】
手術用縫合針は、縫合する際に縫合針に対して垂直にかかる曲げモーメントに対して強度が強く、かつ、組織に刺入する際の刺通抵抗をできるだけ小にして患者の苦痛を少なくするように構成することが好ましい。
【０００３】
従来の手術用縫合針の製造方法として、例えば図１０に示す技術が一般に知られている。この従来の技術はＶ溝を設けたプレス成形型（図示せず）を用い、丸棒状の針材の一端側をプレス加工することによって、図１０Ａに示すように、プレス加工上面２を底辺とする略正三角形状の三角棒状部１を成形する。次いで前記棒状部１の先端側の前記上面２を、同図Ａに仮想線３で示すように研削し、この研削により、同図Ｂに示すように研削面２ａの両側に設けられた稜線を切刃４，５としてシャープに形成すると共に先端を尖鋭に形成し、縫合針を製造するものである。
【０００４】
しかし、前記従来技術によって製造された縫合針は刃先部全体が断面略正三角形状に形成されているため、研削面２ａから頂点（稜線６）までの高さｈが高くなって、断面積が大きくなる。そのため、組織に刺入する際の刺通抵抗が大きくなり、患者に苦痛を与える問題を有している。
【０００５】
そこで、前記問題を解消するため、同図Ｃに示すように、前記三角棒状部１を、頂点（稜線６ａ）の角度を鈍角にしたプレス加工上面７を底辺とする横長状の断面二等辺三角形状に形成し、前記棒状部１の先端側の前記上面７を前記と同様、仮想線３ａで示すように研削して、同図Ｄに示すように研削面７ａの両側に設けられた稜線を鋭角の切刃４ａ，５ａとしてシャープに形成し、縫合針を製造する方法が提案されている。この方法によると刃先部は断面鈍角三角形状に形成され、研削面７ａから稜線６ａまでの高さｈ_１が前記図１０Ｂのものに比べて低くなり、断面積が小さくなる。したがって、刺通抵抗を減少させて患者の苦痛をやわらげることができる。
【０００６】
しかしながら、前記上面７ａの両側の稜線の切刃４ａ，５ａを鋭角に形成して前記面７ａから稜線６ａまでの距離を小さくすると、前記のように刺通抵抗は減少するが、反面において、縫合針に対して垂直にかかる曲げモーメントに対し強度が低下して曲がり易くなり、その結果、縫合する際の操作性が悪くなる問題が発生する。
【０００７】
【発明が解決しようとする課題】
本発明は上記のような実情に鑑み、曲げモーメントに対する強度を強く保持させ、かつ、組織に対する刺通性を向上させ得る手術用縫合針の製造方法を提供することを目的とするものである。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、本発明のうち１つの発明（第１の発明）は丸棒状の針材の一端側をプレス加工（一次加工）して、加工上面を略平面状に形成した三角棒状部を成形する第１のプレス成形工程と、前記三角棒状部の先端部を二次プレス加工して、この加工上面が略平面状を呈し、かつ、三角棒状部の一次加工上面の両側の稜線と前記上面に対応する稜線とがそれぞれ先端で交わって、断面略二等辺三角形状に形成された刃先形成部と、三角棒状部の余剰の部分を刃先形成部の周縁から外方にはみ出させて形成される扁平状のバリ片とを有する針先部を形成する第２のプレス成形工程と、前記三角棒状部の前記加工上面に対応する稜線の部位を、針先部の先端近くから三角棒状部の基部側に向けて所定の巾及び長さの略平面状に成形加工して、この加工部位を断面台形状に形成する工程と、前記刃先形成部の前記加工上面を略平面状に研削して前記バリ片を削り落として刃先を形成すると共に、前記刃先の前記研削面の両側の稜線に切刃を形成する工程とを含むことを特徴とする。なお、この明細書において、刃先及び切刃を形成する際に使用している「研削」とは、研磨も含む意味として用いられている。
【０００９】
上記発明によれば、三角棒状部の先端部を二次プレス加工することによって、硬化，強化された刃先形成部が形成され、この刃先形成部の加工上面を略平面状に研削してバリ片を除去することにより、強化された尖端を持つ均一な刃先が形成される。そして、三角棒状部の加工上面に対応する稜線の部位を針先部の先端近くから三角棒状部の基部側に向けて略平面状に成形加工して、この加工部位を断面台形状に形成し、刃先部の高さを低く形成してあるので、刺通抵抗が小になり、刺入の際の刺通性を向上させ、患者の苦痛をやわらげる。また、前記断面台形状の加工により、加工部位は高さが低くなって、その部分だけ肉薄になるが、刃先部は二度のプレス加工（一次及び二次プレス加工）によって硬化，強化されているので、曲げモーメントに対する強度を強く保持されている。
【００１０】
本発明において、前記稜線の部位を略平面状に成形する加工手段は特に限定されるものではないが、研削加工を採用し、或いはプレス加工を採用することもできる。また、本発明において、前記切刃は前記研削面の両側の稜線に加え、針先部の先端部に残されている、前記研削面に対応する稜線にも形成することができる。
【００１１】
本発明のうち他の１つの発明（第２の発明）は丸棒状の針材の一端側をプレス加工（一次加工）して、加工上面を略平面状に形成した三角棒状部を形成する第１のプレス成形工程と、前記三角棒状部を二次プレス加工して、一次加工上面に対応する稜線の部位を三角棒状部の先端近くまで所定の巾で略平面状に押しつぶして、この加工部位を断面台形状に形成すると共に、三角棒状部の一次加工上面の両側の稜線と三角棒状部の先端側に残された稜線とがそれぞれ先端で交わる、断面略二等辺三角形状の刃先形成部と、三角棒状部の余剰の部分を刃先形成部の周縁から外方にはみ出させて形成される扁平状のバリ片とを有する針先部を形成する第２のプレス成形工程と、前記刃先形成部の前記加工上面を略平面状に研削して前記バリ片を削り落として刃先を形成すると共に、前記刃先の前記研削面の両側の稜線に切刃を形成する工程とを含むことを特徴とする。
【００１２】
この第２の発明によれば、第１の発明の作用効果に加え、縫合針の生産作業性を一層向上する。また、この第２の発明においても、請求項２記載の発明のように、前記切刃は前記研削面の両側の稜線に加え、前記三角棒状部の先端側に残された稜線にも形成することができる。
【００１３】
本発明のうち他の１つの発明（第３の発明）は丸棒状の針材の一端側をプレス加工（一次加工）して、加工上面及び加工底面を略平面状に形成した台形棒状部を成形する第１のプレス成形工程と、前記台形棒状部の先端部を二次プレス加工して、この加工上面が略平面状を呈し、かつ、台形棒状部の一次加工底面の二本の稜線が前記棒状部の先端近くで交わって一本の稜線に形成されると共に、この一本の稜線と一次加工上面の両側の稜線とがそれぞれ先端で交わって、断面略二等辺三角形状に形成された刃先形成部と、台形棒状部の余剰の部分を刃先形成部の周縁から外方にはみ出させて形成される扁平状のバリ片とを有する針先部を形成する第２のプレス成形工程と、前記刃先形成部の前記加工上面を略平面状に研削して前記バリ片を削り落として刃先を形成すると共に、前記刃先の前記研削面の両側の稜線に切刃を形成する工程とを含むことを特徴とする。
【００１４】
この第３の発明によれば、第１の発明の作用効果に加え、第２の発明と同様に縫合針の生産作業性を一層向上する。また、この第３の発明においても、請求項４記載の発明のように、前記刃先は前記研削面の両側の稜線に加え、台形棒状部の先端部に形成されている一本の稜線にも形成することができる。
【００１５】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態の一例について説明する。図１は本発明の手術用縫合針の製造方法の一実施の形態（実施の形態１）の製造工程の全体の流れを概略的に示す説明図、図２は同上製造工程中、三角棒状部を成形する工程を示す説明図、図３は同上製造工程中、針先部を形成する工程を示す説明図、図４は図３の工程により加工された加工品を示す側面図と底面図、図５は同上製造工程中、三角棒状部の針先部側を断面台形状に形成する工程を示す説明図、図６は図１の製造工程中、刃先を形成する工程を示す説明図である。
【００１６】
上記図１〜図６において、丸棒状の針材１１は、その素材として、例えばオーステナイト系ステンレス（ＳＵＳ３０４）その他のステンレス鋼等を採用し、針材１１の径及び長さは、縫合する部位，用途、目的等に応じて選定される。
【００１７】
本発明の製造方法は針基部の端部に軸線方向に向けた糸穴（かしめ穴）を設けるアイド針及び針基部にバネ穴（弾機穴ともいう）やナミ穴（普通穴ともいう）等の糸穴を設けるアイレス針の両方に適用できるもので、針材１１の針基部１２の側の端部には、任意の段階（通常は三角棒状部を成形する工程の前）で糸穴１３を形成する。この実施の形態では糸穴１３としてバネ穴を設けた例が開示されている（図６Ａ参照）。
【００１８】
図２に詳細に示すように、エンドレス状のＶ溝３２を設けたプレス成形型３１のＶ溝３２内へ針材１１の一端側（先端側）を入れ、これを昇降プレス型（図示せず）でプレス加工（一次加工）する。この工程により、針材１１の先端側に、加工上面１５が略平面状をなすと共に断面形状が前記上面１５を底辺とする略二等辺三角形状（図２Ｃ参照）を呈する三角棒状部１４が形成される。この三角棒状部１４の長さは適当に決定するものであるが、例えば針材１１の長さの約１／２〜約１／３程度の範囲（図示では約２／５程度）で形成することができる。
【００１９】
次に図３に詳細に示すように、先端に向けて徐々に巾が細く、かつ、溝が浅くなったＶ溝３４を有するプレス成形型３３を用い、三角棒状部１４の先端部を、前記上面１５に対応する稜線１６を下側にすると共に型３３のＶ溝３４に合致させて入れ、これを昇降プレス型（図示せず）でプレス加工（二次プレス加工）する。この工程により、三角棒状部１４の先端部に二次加工上面１５ａが一次加工上面１５と延設する略平面状を呈し、かつ、三角棒状部１４の一次加工上面１５の両側の稜線１７，１８と前記上面１５に対応する稜線１６とがそれぞれ先端で交わって、断面形状が二次加工上面１５ａを底辺とする略二等辺三角形状を呈する先細の刃先形成部１９と、三角棒状部１４の余剰の部分を刃先形成部１９の両側の稜線１５ａ，１６ａの周縁から外方にはみ出させて形成される扁平状のバリ片２０を有する針先部２１が形成される。この針先部２１は二度のプレス加工（一次及び二次プレス加工）により硬化して強化される。
【００２０】
前記刃先形成部１９の長さは適当に決定するものであるが、例えば三角棒状部１２の長さの約１／３〜約１／５程度の範囲（図示では約１／４程度）で形成することができる。
【００２１】
次いで、三角棒状部１４の前記上面１５に対応する稜線１６の部位を図４に仮想線（研削ラインＬ）で示すように、針先部２１の先端近くから前記棒状部１４の基部側に向けて適当な巾及び長さの略平面状に研削加工する。この工程により、前記研削加工部位は図５に詳細に示すように、前記研削面２２と前記上面１５及び両側の傾斜壁面２３，２４とによる断面台形状に形成される。前記研削面２２の長さは適当に設定できるものであるが、例えば三角棒状部１４の長さの約１／２〜約１／４程度（図示では約３／８）に形成することができる。
【００２２】
次いで加工上面１５を略平面状に研削し、バリ片２０を削り落して刃先１９ａを形成する（図６参照）。そして刃先１９ａを研削して刃先１９ａの研削面１５ａの両側の稜線１７ａ，１８ａに切刃２５を形成する。前記切刃２５は前記研削面１５ａ及び傾斜壁面２３，２４を研削することにより形成できる。また、この場合において、前記両壁面２３，２４を研削する際に、刃先１９ａの先端部に残されている、前記面１５ａに対応する稜線１６ａにも切刃２５ａを形成する。上記工程によって直針の製品が得られ、また、弯曲針にあっては図６Ｆ及び図１Ｋに示すように、針全体を所定の形状に弯曲して製品とする。上記により、強化された刃先尖端２６を有すると共にシャープな切刃２５を持ち、かつ、曲げモーメントに対して強度を強く保持すると共に組織に対する刺通性を向上した手術用縫合針が得られる。
【００２３】
図７は本発明の手術用縫合針の製造方法の他の実施の形態（実施の形態２）の要部を示す説明するために示す説明図である。この実施の形態２は前記三角棒状部１４の前記上面１５に対応する稜線１６の部位を略平面状に成形する加工手段として、プレス加工を採用したことに特徴がある。
【００２４】
即ち、実施の形態２は実施の形態１の研削加工に代え、適当な巾及び長さを有し、一端側（図において右側）を針先部２１の先端側と対応させて円弧状に形成したプレス面３６を有する昇降プレス型３５を用い、加工品を前記稜線１６を上方側に向けて台型３７上に載置し、プレス型３５でプレス加工して稜線１６の部位を押しつぶし、略平面状に成形する。これにより、三角棒状部１４の前記プレス加工部位は前記上面１５とプレス加工上面及び両側の傾斜壁面２３，２４とによる断面台形状に形成される。他の製造工程及び構成は実施の形態１と全く同様であるため、説明を省略する。この実施の形態２によっても実施の形態１と同様の作用効果を奏する手術用縫合針が得られる。なお、この場合において、前記昇降プレス型３５に代え、後述する図８に示すような溝を有するプレス成形型を用い、この型の溝に針先部２１の先端側を、稜線１６を下側にすると共に型の溝に合致させて入れ、昇降プレス型（図示せず）でプレス加工して、この加工部位を断面台形状に形成する方法を採用してもよい。
【００２５】
図８は本発明の手術用縫合針の製造方法のさらに他の実施の形態（実施の形態３）の要部を説明するために示す説明図である。実施の形態３は針先部２１及び稜線１６の部位を略平面状に成形する加工手段に特徴がある。
【００２６】
即ち、実施の形態３は台形状の溝３８と、この溝３８に延設され、先端（図において右側）に向けて巾が細く、かつ、溝が浅くなったＶ溝３９を有するプレス成形型４０を用いる。そして、三角棒状部１４の先端部を、稜線１６を下側にすると共に型４０の溝３８，３９に合致させて入れ、これを昇降プレス型（図示せず）でプレス加工（二次プレス加工）する。
【００２７】
上記工程により、三角棒状部１４の前記プレス加工部位は、稜線１６の部位が前記棒状部１４の先端近くまで所定の巾で押しつぶされて断面台形状に成形されると共に、前記棒状部１４の一次加工上面１５の両側の稜線１７，１８と前記棒状部１４の先端側に残された稜線１６とがそれぞれ先端で前記上面１５と面一状に交わって形成された断面略二等辺三角形状の刃先形成部１９と、三角棒状部１４の先端側の余剰の部分を刃先形成部１９の両側の稜線１５ａ，１６ａの周縁から外方にはみ出させて形成される扁平状のバリ片２０を有する針先部２１が形成される。他の製造工程及び構成は実施の形態１と同様であるため、説明を省略する。この実施の形態３によっても実施の形態１と同様の作用効果を奏する手術用縫合針が得られる。
【００２８】
図９は本発明の手術用縫合針の製造方法のさらに他の実施の形態（実施の形態４）の要部を示す説明図である。実施の形態４は実施の形態１の三角棒状部１４に代え、針材１１の一端側をプレス加工して台形棒状部を成形する加工工程に特徴がある。
【００２９】
即ち、実施の形態４はエンドレス状の台形溝４１を設けたプレス成形型４２を用い、前記溝４１内へ針材１１の一端側（先端側）を入れ、これを昇降プレス型（図示せず）でプレス加工（一次加工）する。この工程により、針材１１の先端側に、加工上面５２及び加工底面５３を略平面状に形成した台形棒状部５１が形成される。この台形棒状部５１の長さは三角棒状部１４と同様に適当に決定できるものであるが、例えば針材１１の長さの約１／２〜約１／４程度の範囲（図示では約１／３強）に形成することができる。
【００３０】
他の製造工程及び構成については実施の形態１と同様（但し、実施の形態４では針材１１の先端側は断面台形状に形成されているので、実施の形態１の製造工程中、稜線１６の部位を略平面状に研削加工ないしプレス加工する工程は省かれる。）であるため、説明を省略する。この実施の形態４によっても実施の形態１と同様の作用効果を奏する手術用縫合針が得られる。
【００３１】
【発明の効果】
本発明によれば曲げモーメントに対する強度を強く保持させて縫合操作性を良好にし、かつ、刺入時の刺通抵抗を少なくして刺通性を向上させ得る手術用縫合針を製造することができる。
【図面の簡単な説明】
【図１】本発明の手術用縫合針の製造方法の一実施の形態の製造工程の全体の流れを概略的に示す説明図であって、同図Ａは丸棒状の針材を示す図、同図Ｂはプレス成形型の斜視図、同図Ｃは三角棒状部を成形する工程を示す説明図、同図Ｄは同図ＣのＤ−Ｄ線拡大断面図、同図Ｅはプレス成形型の斜視図、同図Ｆは針先部を形成する工程を示す説明図、同図Ｇは三角棒状部の針先部側を断面台形状に形成する工程を示す説明図、同図Ｈ及びＩは同図ＧのＨ−Ｈ線で切断して示す断面図及び斜視図、同図Ｊは刃先を形成する工程を示す説明図、同図Ｋは弯曲針を製造する工程を示す説明図。
【図２】同上製造工程中、三角棒状部を成形する工程を拡大して示す説明図であって、同図Ａは加工品の斜視図、同図Ｂはプレス成形型の斜視図、同図Ｃは同図ＡのＣ−Ｃ線拡大断面図。
【図３】同上製造工程中、針先部を形成する工程を拡大して示す説明図であって、同図Ａは加工品の斜視図、同図Ｂはプレス成形型を示す斜視図、同図Ｃは同図ＡのＣ−Ｃ線断面図。
【図４】図３の工程により加工された加工品の側面図と底面図。
【図５】同上製造工程中、三角棒状部の針先部側を断面台形状に形成する工程を示す説明図であって、同図Ａは加工品の側面図、同図Ｂは同じく底面図、同図Ｃは同図ＢのＣ−Ｃ線断面図。
【図６】同上製造工程中、刃先を形成する工程を拡大して示す説明図であって、同図Ａは加工品の底面図、同図Ｂ及びＣは同図ＡのＡ−Ａ線で切断して示す一方及び他方の面から見た斜視図、同図Ｄ及びＥは同図ＡのＢ−Ｂ線及びＣ−Ｃ線断面図、同図Ｆは弯曲針を製造する工程を示す説明図。
【図７】本発明の手術用縫合針の製造方法の他の実施の形態の要部を説明するために示す説明図。
【図８】本発明の手術用縫合針の製造方法のさらに他の実施の形態の要部を説明するために示す説明図。
【図９】本発明の手術用縫合針の製造方法のさらに他の実施の形態の要部を説明するために示す説明図であって、同図Ａは加工品の斜視図、同図Ｂはプレス成形型を示す斜視図、同図Ｃは同図ＡのＣ−Ｃ線断面図。
【図１０】従来の手術用縫合針の製造方法及びその問題点を説明するために示す説明図。
【符号の説明】
１１…針材、１４…三角棒状部、１５…加工上面、１６，１７，１８…稜線、１７ａ，１８ａ…稜線、１９…刃先形成部、１９ａ…刃先、２０…バリ片、２１…針先部、３３…プレス成形型、３４…Ｖ溝[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a surgical suture needle used in various types of surgery.
[0002]
[Prior art]
Surgical suture needles are strong against bending moments perpendicular to the suture needle during suturing, and reduce the patient's pain by minimizing the piercing resistance when inserting into tissue. It is preferable to configure as described above.
[0003]
For example, a technique shown in FIG. 10 is generally known as a conventional method for manufacturing a surgical suture needle. This conventional technique uses a press mold (not shown) provided with a V-groove, and presses one end side of a round bar-shaped needle material, so that the press-processed upper surface 2 is the bottom side as shown in FIG. 10A. A substantially equilateral triangular triangular rod-shaped portion 1 is formed. Next, the upper surface 2 on the distal end side of the rod-like portion 1 is ground as indicated by a virtual line 3 in FIG. A, and by this grinding, ridge lines provided on both sides of the grinding surface 2a as shown in FIG. The cutting blades 4 and 5 are formed sharply and the tip is formed sharply to manufacture a suture needle.
[0004]
However, since the entire cutting edge of the suturing needle manufactured by the conventional technique is formed in a substantially equilateral triangle shape, the height h from the grinding surface 2a to the apex (ridge line 6) is increased, and the cross-sectional area is increased. growing. For this reason, there is a problem that the puncture resistance at the time of insertion into the tissue is increased, and the patient is painful.
[0005]
Therefore, in order to solve the above problem, as shown in FIG. 3C, the triangular bar-shaped portion 1 has a horizontally long isosceles triangle with a bottom surface of the press-processed upper surface 7 in which the angle of the apex (ridge line 6a) is an obtuse angle. The upper surface 7 on the tip side of the rod-shaped portion 1 is ground as shown by the imaginary line 3a, and the ridge lines provided on both sides of the grinding surface 7a as shown in FIG. A method has been proposed in which sharp cutting edges 4a and 5a are formed sharply and a suture needle is manufactured. Cutting unit according to this method is formed in a cross-section an obtuse triangular shape, the height h ₁ from the grinding surface 7a until ridge 6a is lower than that of FIG. 10B, the cross-sectional area decreases. Therefore, the piercing resistance can be reduced and the patient's pain can be eased.
[0006]
However, if the cutting edges 4a and 5a of the ridge lines on both sides of the upper surface 7a are formed at acute angles to reduce the distance from the surface 7a to the ridge line 6a, the piercing resistance decreases as described above, but on the other hand, the stitching resistance is reduced. The strength decreases with respect to a bending moment applied perpendicularly to the needle, and it becomes easy to bend. As a result, there arises a problem that the operability at the time of sewing is deteriorated.
[0007]
[Problems to be solved by the invention]
In view of the above circumstances, an object of the present invention is to provide a method for manufacturing a surgical suture needle that can strongly maintain the strength against a bending moment and can improve the piercing property of a tissue.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, one of the present inventions (first invention) is a triangular bar shape in which one end side of a round bar-like needle material is pressed (primary processing) and the processing upper surface is formed in a substantially flat shape. A first press-forming step of forming a portion, and a second press processing of the tip portion of the triangular bar-shaped portion, and the processing upper surface has a substantially flat shape, and the ridge lines on both sides of the primary processing upper surface of the triangular bar-shaped portion And the ridge line corresponding to the upper surface respectively intersect at the tip, and the blade edge forming portion formed in a substantially isosceles triangular cross section and the excess portion of the triangular bar-shaped portion protrude outward from the peripheral edge of the blade edge forming portion. A second press molding step for forming a needle tip portion having a flat burr piece to be formed, and a portion of a ridge line corresponding to the processing upper surface of the triangular bar shape portion from the tip end of the needle tip portion to a triangular bar shape Molded into a substantially flat shape with a predetermined width and length toward the base side And forming the cutting edge into a trapezoidal cross section, and grinding the cutting upper surface of the cutting edge forming portion into a substantially flat shape to scrape off the burr pieces to form a cutting edge, and the grinding of the cutting edge. Forming a cutting edge on the ridge line on both sides of the surface. In this specification, “grinding” used when forming the cutting edge and the cutting edge is used as a meaning including polishing.
[0009]
According to the above invention, the tip portion of the triangular bar-shaped portion is subjected to secondary press processing to form a hardened and strengthened blade edge forming portion, and the processing upper surface of the blade edge forming portion is ground into a substantially flat shape to obtain a burr piece. By removing, a uniform cutting edge with an enhanced tip is formed. Then, the part of the ridge line corresponding to the processing upper surface of the triangular bar-shaped part is formed into a substantially flat shape from the vicinity of the tip of the needle tip part toward the base side of the triangular bar-shaped part, and this processed part is formed into a trapezoidal cross section. Since the height of the blade edge portion is formed low, the piercing resistance is reduced, the piercing property at the time of insertion is improved, and the patient's pain is eased. Also, due to the processing of the trapezoidal cross section, the height of the processed portion is reduced and only that portion is thinned, but the cutting edge portion is hardened and strengthened by two press processes (primary and secondary press processes). Therefore, the strength against bending moment is strongly maintained.
[0010]
In the present invention, the processing means for forming a portion of the ridge to the substantially flat shape is not particularly limited, adopted Grinding process, walk can also be employed up less processing. Further, in the present invention, the cutting edge in addition to the ridge on both sides of the front Symbol grinding surface, has been left at the tip portion of the probe tip portion can be formed on the ridge corresponding to the grinding surface.
[0011]
Another invention of the present invention (second invention) is a first method in which one end side of a round bar-shaped needle material is pressed (primary processing) to form a triangular bar-shaped portion having a processed upper surface substantially flat. The press forming step 1 and the triangular bar-shaped portion are subjected to secondary press processing, and the portion of the ridge line corresponding to the upper surface of the primary processing is crushed into a substantially flat shape with a predetermined width near the tip of the triangular rod-shaped portion. the thereby formed into trapezoidal cross-section, the primary processing the upper surface sides of the ridge and the ridge line left on the distal end side of the triangular rod portion of the triangular rod portion intersect each tip, a substantially isosceles triangular shape of the cutting edge forming portion A second press molding step of forming a needle tip portion having a flat burr piece formed by protruding an excess portion of the triangular bar-like portion outward from a peripheral edge of the blade tip forming portion; Grind the burr piece by grinding the processing upper surface of the part into a substantially flat surface To form the cutting edge as, characterized by comprising a step of forming a cutting edge on both sides of the ridge line of the ground surface of the cutting edge.
[0012]
According to the second invention, in addition to the function and effect of the first invention, the production workability of the suture needle is further improved. Also in the second invention, as in the invention described in claim 2 , the cutting edge is formed not only on the ridge line on both sides of the grinding surface but also on the ridge line left on the tip side of the triangular bar portion. be able to.
[0013]
One of the present inventions (third invention) is a trapezoidal bar-shaped portion in which one end side of a round bar-shaped needle material is pressed (primary processing), and the processing upper surface and processing bottom surface are formed in a substantially flat shape. The first press molding step to be molded and the tip of the trapezoidal bar-shaped portion are subjected to secondary press processing, the processed upper surface has a substantially flat shape, and the two ridge lines on the bottom surface of the primary processing of the trapezoidal bar-shaped portion are Formed as one ridge line intersecting near the tip of the rod-shaped part, and the one ridge line and the ridge lines on both sides of the upper surface of the primary processing intersect each other at the tip to form a substantially isosceles cross section. A second press molding step of forming a needle tip portion having a blade tip forming portion and a flat burr piece formed by protruding an excessive portion of the trapezoidal bar-like portion outward from the periphery of the blade tip forming portion; Grinding the burr piece by grinding the processed upper surface of the cutting edge forming portion into a substantially flat shape. To form a cutting edge drop, characterized in that it comprises a step of forming a cutting edge on both sides of the ridge line of the ground surface of the cutting edge.
[0014]
According to the third invention, in addition to the operational effects of the first invention, the production workability of the suture needle is further improved as in the second invention. Also in the third invention, as in the invention described in claim 4 , in addition to the ridge line on both sides of the grinding surface, the cutting edge is also formed on one ridge line formed at the tip of the trapezoidal bar-shaped part. Can be formed.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view schematically showing an overall flow of a manufacturing process of an embodiment (embodiment 1) of a method for manufacturing a surgical suture needle according to the present invention, and FIG. FIG. 3 is an explanatory view showing a step of forming a needle tip part during the manufacturing process, FIG. 4 is a side view and a bottom view showing a processed product processed by the step of FIG. FIG. 5 is an explanatory view showing a step of forming the needle tip side of the triangular bar-like portion into a trapezoidal cross section during the manufacturing process, and FIG. 6 is an explanatory view showing a step of forming a blade edge during the manufacturing step of FIG. .
[0016]
In FIG. 1 to FIG. 6, the round bar-shaped needle material 11 employs, for example, austenitic stainless steel (SUS304) or other stainless steel as the material, and the diameter and length of the needle material 11 are the parts to be sewn, It is selected according to the use and purpose.
[0017]
The manufacturing method of the present invention includes an idle needle having a thread hole (caulking hole) oriented in the axial direction at the end of the needle base, and a spring hole (also referred to as a bullet hole) or a slot hole (also referred to as a normal hole) in the needle base. Can be applied to both of the eyeless needles provided with a thread hole, and the thread hole 13 is formed at an arbitrary stage (usually before the step of forming the triangular bar-shaped part) at the end of the needle member 11 on the side of the needle base 12. Form. In this embodiment, an example in which a spring hole is provided as the thread hole 13 is disclosed (see FIG. 6A).
[0018]
As shown in detail in FIG. 2, one end side (tip end side) of the needle material 11 is put into the V groove 32 of the press mold 31 provided with the endless V groove 32, and the needle material 11 is moved up and down (not shown). ) Press processing (primary processing). By this step, a triangular bar-like portion 14 is formed on the distal end side of the needle material 11 and the processing upper surface 15 is substantially planar and the cross-sectional shape is a substantially isosceles triangular shape (see FIG. 2C) with the upper surface 15 as a base. Is done. The length of the triangular bar portion 14 is appropriately determined. For example, it is formed in a range of about 1/2 to about 1/3 of the length of the needle material 11 (about 2/5 in the figure). be able to.
[0019]
Next, as shown in detail in FIG. 3, using a press mold 33 having a V-groove 34 that gradually narrows toward the tip and has a shallow groove, the tip of the triangular bar 14 is The ridgeline 16 corresponding to the upper surface 15 is set to the lower side and aligned with the V groove 34 of the die 33, and this is pressed (secondary press) by a lifting press die (not shown). Through this process, the secondary processing upper surface 15a has a substantially planar shape extending from the primary processing upper surface 15 at the tip of the triangular bar-shaped portion 14, and the ridge lines 17 and 18 on both sides of the primary processing upper surface 15 of the triangular bar-shaped portion 14 are obtained. And a ridge line 16 corresponding to the upper surface 15 intersect at the tip, and a tapered blade edge forming portion 19 having a substantially isosceles triangular shape whose cross-sectional shape is the bottom surface of the secondary processing upper surface 15a, and an excess of the triangular bar-shaped portion 14 A needle tip portion 21 having a flat burr piece 20 formed by protruding the portion outward from the peripheral edge of the ridge lines 15a and 16a on both sides of the blade edge forming portion 19 is formed. The needle tip portion 21 is hardened and strengthened by two press processes (primary and secondary press processes).
[0020]
The length of the blade edge forming portion 19 is appropriately determined. For example, it is formed in a range of about 1/3 to about 1/5 of the length of the triangular bar portion 12 (about 1/4 in the drawing). can do.
[0021]
Next, as indicated by a virtual line (grinding line L) in FIG. 4, the portion of the ridge line 16 corresponding to the upper surface 15 of the triangular bar 14 is directed from the vicinity of the tip of the needle tip 21 toward the base of the bar 14. And grinding into a substantially flat shape with an appropriate width and length. By this step, the grinding portion is formed in a trapezoidal cross section by the grinding surface 22, the upper surface 15, and the inclined wall surfaces 23, 24 on both sides, as shown in detail in FIG. The length of the grinding surface 22 can be appropriately set. For example, it can be formed to be about 1/2 to about 1/4 of the length of the triangular bar 14 (about 3/8 in the figure). .
[0022]
Next, the processing upper surface 15 is ground into a substantially flat shape, and the burr piece 20 is scraped off to form the blade edge 19a (see FIG. 6). Then, the cutting edge 25 is formed on the ridge lines 17a and 18a on both sides of the grinding surface 15a of the cutting edge 19a by grinding the cutting edge 19a. The cutting edge 25 can be formed by grinding the ground surface 15a and the inclined wall surfaces 23 and 24. In this case, when the both wall surfaces 23 and 24 are ground, the cutting edge 25a is also formed on the ridge line 16a corresponding to the surface 15a, which is left at the tip of the cutting edge 19a. A straight needle product is obtained by the above-described process. Further, as shown in FIGS. 6F and 1K, the entire needle is bent into a predetermined shape to obtain a product. As described above, a surgical suture needle having a reinforced edge point 26 and a sharp cutting edge 25, which has a strong strength against a bending moment and has improved piercing property to tissue can be obtained.
[0023]
FIG. 7 is an explanatory view for explaining the main part of another embodiment (Embodiment 2) of the method for manufacturing a surgical suture needle of the present invention. The second embodiment is characterized in that press working is employed as a processing means for forming the portion of the ridge line 16 corresponding to the upper surface 15 of the triangular bar portion 14 into a substantially flat shape.
[0024]
That is, the second embodiment has an appropriate width and length in place of the grinding process of the first embodiment, and is formed in an arc shape with one end side (right side in the figure) corresponding to the tip side of the needle tip portion 21. Using the elevating press die 35 having the pressed surface 36, the work piece is placed on the table die 37 with the ridge line 16 facing upward, and is pressed by the press die 35 to crush the portion of the ridge line 16, approximately. Mold in a flat shape. Thereby, the said press-working site | part of the triangular bar-shaped part 14 is formed in the cross-sectional trapezoid shape by the said upper surface 15, the press work upper surface, and the inclined wall surfaces 23 and 24 of both sides. Since other manufacturing steps and configurations are exactly the same as those in the first embodiment, description thereof is omitted. According to the second embodiment, a surgical suture needle having the same effects as those of the first embodiment can be obtained. In this case, a press mold having a groove as shown in FIG. 8, which will be described later, is used in place of the elevating press mold 35, and the tip side of the needle tip portion 21 is placed in this mold groove, and the ridge line 16 is placed on the lower side. In addition, a method may be employed in which the processed portion is formed in a trapezoidal cross-section by pressing it with a lifting press die (not shown) in conformity with the groove of the die.
[0025]
FIG. 8 is an explanatory view for explaining a main part of still another embodiment (Embodiment 3) of the method for manufacturing a surgical suture needle of the present invention. The third embodiment is characterized by processing means for forming the portions of the needle tip portion 21 and the ridge line 16 into a substantially flat shape.
[0026]
That is, the third embodiment is a press-molding die having a trapezoidal groove 38 and a V-groove 39 extending in the groove 38, narrower toward the tip (right side in the figure) and shallower. 40 is used. Then, the tip of the triangular bar-shaped portion 14 is placed with the ridge line 16 on the lower side and aligned with the grooves 38 and 39 of the die 40, and this is pressed by a lifting press die (not shown) (secondary press work). )
[0027]
According to the above process, the pressed portion of the triangular bar-shaped portion 14 is formed into a trapezoidal cross-section by crushing the portion of the ridge line 16 with a predetermined width to the vicinity of the tip of the rod-shaped portion 14, and the primary portion of the rod-shaped portion 14. Edges 17 and 18 on both sides of the processing upper surface 15 and ridge lines 16 left on the tip side of the rod-like portion 14 are formed so as to intersect with the upper surface 15 at the tip, respectively. A needle tip having a flat burr piece 20 formed by protruding the forming portion 19 and an excessive portion on the tip end side of the triangular rod-shaped portion 14 outward from the peripheral edges of the ridge lines 15a and 16a on both sides of the blade edge forming portion 19. Part 21 is formed. Since other manufacturing steps and configurations are the same as those in the first embodiment, the description thereof is omitted. According to the third embodiment, a surgical suture needle having the same effects as those of the first embodiment can be obtained.
[0028]
FIG. 9 is an explanatory view showing the main part of still another embodiment (Embodiment 4) of the method for manufacturing a surgical suture needle of the present invention. The fourth embodiment is characterized by a processing step of forming a trapezoidal bar-shaped portion by pressing one end side of the needle material 11 instead of the triangular bar-shaped portion 14 of the first embodiment.
[0029]
That is, the fourth embodiment uses a press mold 42 provided with an endless trapezoidal groove 41, and inserts one end side (tip end side) of the needle material 11 into the groove 41, and this is used as a lifting press mold (not shown). ) Press processing (primary processing). By this step, a trapezoidal bar-like portion 51 in which the machining upper surface 52 and the machining bottom surface 53 are formed in a substantially planar shape is formed on the tip side of the needle material 11. The length of the trapezoidal bar-like portion 51 can be appropriately determined in the same manner as the triangular bar-like portion 14, but is, for example, in the range of about 1/2 to about 1/4 of the length of the needle material 11 (about 1 in the figure). / 3)).
[0030]
Other manufacturing processes and configurations are the same as in the first embodiment (however, in the fourth embodiment, the tip side of the needle material 11 is formed in a trapezoidal cross section, and therefore the ridge line 16 is formed during the manufacturing process of the first embodiment. The step of grinding or pressing the part in a substantially flat shape is omitted. According to the fourth embodiment, a surgical suture needle having the same effects as those of the first embodiment can be obtained.
[0031]
【The invention's effect】
According to the present invention, it is possible to manufacture a surgical suture needle that can maintain a strong strength against a bending moment to improve suturing operability, and can reduce piercing resistance at the time of insertion and improve piercing performance. it can.
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing the overall flow of a manufacturing process of an embodiment of a method for manufacturing a surgical suture needle of the present invention, wherein FIG. 1A shows a round bar-like needle material; Fig. B is a perspective view of a press mold, Fig. C is an explanatory view showing a process of forming a triangular bar portion, Fig. D is an enlarged sectional view taken along the line DD of Fig. C, and Fig. E is a press mold. F is an explanatory view showing a step of forming the needle tip portion, FIG. G is an explanatory view showing a step of forming the needle tip portion side of the triangular bar-like portion into a trapezoidal cross section, and FIGS. FIG. 6 is a sectional view and a perspective view cut along the line H-H in FIG. G, FIG. J is an explanatory view showing a process of forming a cutting edge, and FIG. K is an explanatory view showing a process of manufacturing a curved needle.
FIG. 2 is an enlarged explanatory view showing a process of forming a triangular bar-like portion during the manufacturing process, wherein FIG. A is a perspective view of a processed product, FIG. B is a perspective view of a press mold, and FIG. C is an enlarged sectional view taken along line CC of FIG.
FIG. 3 is an explanatory view showing, in an enlarged manner, a step of forming a needle tip part during the manufacturing process, wherein FIG. A is a perspective view of a processed product, and FIG. B is a perspective view showing a press mold; FIG. C is a sectional view taken along line CC of FIG.
4 is a side view and a bottom view of a processed product processed by the process of FIG. 3;
FIGS. 5A and 5B are explanatory views showing a process of forming the needle tip side of the triangular bar-shaped part into a trapezoidal cross section during the manufacturing process, wherein FIG. A is a side view of the processed product, and FIG. FIG. 10C is a cross-sectional view taken along line CC of FIG.
FIG. 6 is an explanatory view showing, in an enlarged manner, a step of forming a cutting edge during the manufacturing process, wherein FIG. A is a bottom view of a processed product, and FIGS. B and C are taken along line AA in FIG. The perspective view seen from one side and the other side shown cut, D and E are sectional views taken along the lines BB and CC in FIG. A, and FIG. F is an explanation showing the process of manufacturing a curved needle. Figure.
FIG. 7 is an explanatory view for explaining a main part of another embodiment of the method for manufacturing a surgical suture needle of the present invention.
FIG. 8 is an explanatory view for explaining a main part of still another embodiment of the method for manufacturing a surgical suture needle according to the present invention.
FIGS. 9A and 9B are explanatory views for explaining a main part of still another embodiment of the method for manufacturing a surgical suture needle according to the present invention. FIG. 9A is a perspective view of a processed product, and FIG. The perspective view which shows a press molding die, the same figure C is the CC sectional view taken on the line of the same figure A. FIG.
FIG. 10 is an explanatory view for explaining a conventional method for manufacturing a surgical suture needle and its problems.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Needle material, 14 ... Triangular rod-shaped part, 15 ... Processing upper surface, 16, 17, 18 ... Ridge line, 17a, 18a ... Ridge line, 19 ... Cutting edge formation part, 19a ... Cutting edge, 20 ... Burr piece, 21 ... Needle tip part 33 ... Press mold, 34 ... V-groove

Claims

A first press forming step of forming one end side of a round bar-shaped needle material (primary processing) to form a triangular bar-shaped portion having a processed upper surface formed in a substantially planar shape;
The triangular bar-shaped portion is subjected to secondary press processing, and the portion of the ridge line corresponding to the primary processing upper surface is crushed into a substantially flat shape with a predetermined width to the vicinity of the tip of the triangular rod-shaped portion, thereby forming the processed portion into a trapezoidal cross section. with the ridge left on the distal end side of the both sides of the ridge and the triangular rod portion of the primary processing the upper surface of the triangular rod portion intersect each tip, a cross-sectionally substantially isosceles triangular shape of the cutting edge forming portions, the surplus of the triangular rod portion A second press molding step of forming a needle tip portion having a flat burr piece formed by protruding the part of the blade tip outward from the peripheral edge of the blade tip forming portion;
Grinding the processed upper surface of the cutting edge forming portion into a substantially flat shape to scrape off the burr pieces to form a cutting edge, and forming cutting edges on ridge lines on both sides of the ground surface of the cutting edge. Characterized by the
A method for manufacturing a surgical suture needle.

The cutting edge is characterized by being formed on both sides of the ridge and the ridge line that the left on the distal end side of the triangular rod portion of the grinding surface, the manufacturing method of the surgical suturing needle according to claim 1, wherein.

A first press forming step of forming a trapezoidal bar-like portion in which one end side of a round bar-shaped needle material is pressed (primary processing) and the processing upper surface and processing bottom surface are formed in a substantially planar shape;
The tip of the trapezoidal bar-shaped part is subjected to secondary press processing, the processed upper surface has a substantially flat shape, and the two ridge lines on the bottom surface of the primary trapezoidal bar-shaped part intersect each other near the tip of the bar-shaped part. A ridge line formed on the main surface, and the ridge line on both sides of the upper surface of the primary processing intersect with each other at the tip, and the blade edge forming part formed in a substantially isosceles triangular cross section and the surplus of the trapezoidal bar-shaped part A second press molding step of forming a needle tip portion having a flat burr piece formed by protruding the part of the blade tip outward from the peripheral edge of the blade tip forming portion;
Grinding the processed upper surface of the cutting edge forming portion into a substantially flat shape to scrape off the burr pieces to form a cutting edge, and forming cutting edges on ridge lines on both sides of the ground surface of the cutting edge. Characterized by the
A method for manufacturing a surgical suture needle.

The method for manufacturing a surgical suture needle according to claim 3 , wherein the cutting edge is formed on a ridge line on both sides of the ground surface and a single ridge line formed at the tip of the trapezoidal bar-shaped portion. .