TW201221166A - Structure of medical leading wire and manufacture method thereof - Google Patents

Structure of medical leading wire and manufacture method thereof Download PDF

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Publication number
TW201221166A
TW201221166A TW099141012A TW99141012A TW201221166A TW 201221166 A TW201221166 A TW 201221166A TW 099141012 A TW099141012 A TW 099141012A TW 99141012 A TW99141012 A TW 99141012A TW 201221166 A TW201221166 A TW 201221166A
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Taiwan
Prior art keywords
line
wire
convex
guide wire
spiral coil
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TW099141012A
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Chinese (zh)
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TWI472352B (en
Inventor
Yi-An Chen
Sheng-Qi Cai
Shun-Yu Shao
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Metal Ind Res & Dev Ct
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Priority to TW099141012A priority Critical patent/TW201221166A/en
Priority to CN2011102651605A priority patent/CN102475936A/en
Publication of TW201221166A publication Critical patent/TW201221166A/en
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Publication of TWI472352B publication Critical patent/TWI472352B/zh

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Abstract

Disclosed are a structure of medical leading wire and a manufacture method thereof. A core wire has a front section that is shaped in the form of a slender bar having a tapered diameter. The slender bar has a circumferential surface on which a plurality of raised fins arranged in a spaced manner with suitable intervals is integrally formed. A tip section is shaped to provide the tip section. A spiral coil having an inner diameter approximately identical to that of the raised fins and the tip section of the core wire, after the front section of the core wire is sleeved, the raised fins of the core wire is made to abut against an inner circumferential surface with at least one of the coils sleevedly encircling the tip section. The coil sleevedly encircling the tip section and the tip section are fused to integrally bond together, so that the spiral coil is concentrically sleeved and fixed to an outer circumference of the core wire through the raised fins and the tip section. As such, it is not only easy to manufacture the front section of the core wire, but also easy to assemble and couple the spiral coil to provide the front end of the leading wire with improved flexibility and restorability, thereby greatly improving the overall operability of the leading wire.

Description

201221166 六 發明說明: 【發明所屬之技術領域】 發明係提供-種可易於製伽裝,且可使料線具有較佳 線^籌方Ϊ而大幅提高導引線整體操控性之醫療用導引 【先前技術】 ,療用料線主要係顧於心血管 =科,,例如心導管手術,由於人體的 2二2用的導管不容易操控推送到患者的病變位置,因二 醫師於血管内’透過光學儀器的顯像導引,由 i著手動操作將導引線推送到患者的病變位置, 以進行後^=導=線推运到病變位置,即可將導引線抽出, 血管中推ΐ至病ί位;了 m線能夠易於在細小且分歧彎曲的 的真直性,且且右ϋ線不僅必須在自由狀態下具有良好 ί操=必須具備有高度的機械特性 ’二提供醫二在i用上‘佳 形狀,並在心線!之前段式縮小直徑的尖細 ,寬度為G. 3則.5_之甜 銲接的方朗設有複數 # 1A與聽彈簧體2 ,進而使心線丨之前段 前段部1 A在插入血管同軸整體物’以大幅提高 具有以下之缺弊: ㈣之可換性和操控性。然而該料線仍 3 1 201221166 Φ201221166 Sixth invention description: [Technical field to which the invention pertains] The invention provides a medical guide which can be easily installed and embossed, and which can provide a better line of the material and greatly improve the overall handling of the guide line. [Prior Art], the therapeutic material line mainly depends on cardiovascular = department, for example, cardiac catheterization, because the catheter used by the human body 2 2 is not easy to manipulate and is pushed to the patient's lesion position, because the second physician is in the blood vessel' Through the imaging guidance of the optical instrument, the guide wire is pushed to the lesion position of the patient by manual operation, and then the guide wire is pushed to the lesion position, and the guide wire can be extracted, and the blood vessel is pushed. ΐ 病 ί ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; i use the 'good shape' and in the heart! The previous section is reduced in diameter and the width is G. 3. The sweetness of the 5.5_ is welded with the complex #1A and the listening spring body 2, so that the anterior segment 1 A of the anterior segment is inserted coaxially. The whole thing's greatly improved the following drawbacks: (4) The interchangeability and handling. However, the feed line is still 3 1 201221166 Φ

巧固设於心線1之前段部1 Α的外卢 較為繁瑣不易,而大幅增 衣上’使得製作組裝上 •由於心線⑷她為; 体3套穿於前段部丄A外==縮小直徑,而甜甜圈形狀 裝銲接時,無法確保與心線、 〜孔為直孔狀,使得在組 傾斜則會影響導引線^彎曲= 由線呈垂直相交,稍有 •由於心線1之前段性。 與甜甜圈形狀体3的材質將体3叙裝銲接,銲料 響導引線的彎曲特性和操控^。'線1的機械特性,而影 圈狀彈簧體2係將一端銲接固 常不容易使頭端部ic與·^於銲接時是非 接固定後稍有偏差便影塑導綠2保持在同-軸心上,銲 甜甜圈形狀体3與心線j考曲特性和操縱性。 角,因心線1之前段部^ 的相交位置並無導弧 位置造成應力集中而斷裂。^田小’於彎曲時容易在相交 有鑑於此,本發明人遂以Α 問題深入研究,經過長期努力^研究’針對目前所面臨之 幅改善習式之轉,之導引線,進而大 【發明内容】 之。又计示曰〇 本發明之目的一,俾與彳妓α 將心線之前段部成型出漸用導引線製作方法’其係 桿狀之環面上-體成型出複數個,之細長桿狀,並於該細長 2鰭部’以及於頭端成型出同軸當2距離排列之 部及頭端部套穿於一内徑略相 之頭鳊邛,再將心線之前段 線圈,並使圈套於頭端部上;7線凸出鰭部及頭端部之螺旋 不僅可使心線之前段部易於端雜接結合—體鳴此, 線之前段部以同軸心準確組裝===凸出.鳍部,且可於心 及組蝴降低製作 '、/、種邊療用導引線結構,其心線斗U 2 3 4 5 201221166 前段部係為漸進式縮小直徑之細長桿狀,並 上-體成細复數個同轴心且呈適當間隔距離;之環面 以及於頭端成型出同軸心之頭端部,一套 凸出鳍部, 内環面係同軸心頂抵於凸㈣部,—端並固旋線圈’其 部,而使螺旋線圈利用凸出鰭部及頭端部以:二,之頭端 線的外部;藉此’不僅可使‘⑽之前段部 々套穿於心 於結合螺旋線圈後’亦能確保導引線整的^ 3可,性,且 而提供易於準確操作之及操控性。 町撓ί·生及回復性,進 【實施方式】 為使對本發明作更進一步之睁解, 合圖式,詳述如后: 八瞭解效舉一較佳實施例並配 請參閱第2、3圖,本發明之導弓|線丄〇全 〜500〇mm,外徑範圍為〇. 3miH. 8刪,其包括300_ 線圈12 ;該心、線1 ;[之前段為在前方導 1及螺旋 111,後段設有為提供手部推、拉、前段部 良_復性’以利推送穿伸於細小且分歧f 手段係將不鏽鋼或超彈性合金金屬之線材的前,-製作 名虫刻或研磨或放電加工或塑性成型等方式 徑之細長桿狀,並同時於環面上 ς :出漸進式細小直It is more difficult and cumbersome to fix it in the front section of the heart line 1 and the outer reinforcement is more difficult, and the large-scale clothing is made on the 'making assembly ・because the heart line (4) she is; the body 3 is worn in the front part 丄A outside == reduction Diameter, and donut shape when welding, can not ensure that the heart line, ~ hole is a straight hole shape, so that the tilt in the group will affect the guide line ^ bending = vertical intersecting by the line, slightly • due to the heart line 1 Previous paragraph. The material of the donut-shaped body 3 is welded to the body 3, and the bending characteristics and manipulation of the soldering guide wire are controlled. 'The mechanical characteristics of the wire 1 and the shadow ring spring body 2 are welded at one end. It is not easy to make the head end portion ic and the ^ when the welding is not fixed and then slightly offset, then the plastic green guide 2 remains in the same - On the axis, the welding donut shape body 3 and the heart line j test characteristics and maneuverability. The angle is caused by the stress concentration due to the position of the intersection of the front portion of the heart line 1 without the arcing position. ^Tian Xiao' is easy to intersect at the time of bending. In view of this, the inventor has conducted in-depth research on the issue of Α, and after a long-term effort, researched 'the guide line for improving the practice of the current face, and then the big [ SUMMARY OF THE INVENTION It is also to be considered that the first object of the present invention is that 俾 and 彳妓α form the front portion of the core wire into a progressive guide wire manufacturing method, and the tie-shaped toroidal surface-body is formed into a plurality of elongated rods. Shaped, and formed at the head end of the elongated 2 fins and the coaxial end when the distance between the 2 and the end of the head is sleeved over an inner diameter of the head, and then the core of the coil The loop is sleeved on the head end; the 7-line convex fin and the head end spiral not only make the front part of the core line easy to be miscellaneously combined - the body sounds, the front part of the line is accurately assembled by the concentric === convex The fins are formed, and the guide line structure for the ',/, and edge treatments can be reduced in the heart and the group. The front part of the heart line bucket U 2 3 4 5 201221166 is a slender rod shape with a progressively reduced diameter. And the upper body is formed into a plurality of concentric cores and at an appropriate spacing distance; the toroidal surface and the end portion of the concentric core are formed at the head end, a set of protruding fins, and the inner annular surface is coaxially convex to the convex surface (4) the part, the end and the coiled coil's part, and the spiral coil uses the protruding fin and the head end to: 2, the outer end of the head line; This not only enables the ‘(10) before the 段 结合 结合 结合 结合 结合 结合 ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ ’ 亦 亦 亦 亦 亦 亦 亦 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 In order to make the invention further understand, the drawings are detailed as follows: Eight understand the effect and a preferred embodiment and refer to the second 3, the guide bow of the present invention | line 丄〇 all ~ 500 〇 mm, the outer diameter range is 〇. 3miH. 8 delete, which includes 300_ coil 12; the heart, line 1; [the previous paragraph is in front of 1 and Spiral 111, the rear section is provided to provide the hand to push, pull, the front section of the good _re- ing 'to facilitate the push to stretch in the small and divergent f means the stainless steel or super-elastic alloy metal wire front, - making the name insect Or slender or electric discharge machining or plastic forming, such as slender rod shape, and at the same time on the annulus: progressively small straight

凸出‘W 1 2及前端之;=2 ^二小直徑之前段部U 該漸進式縮小直徑,於本實施例中, 範圍為0. 05咖〜1. 6刪,凸出鍵‘ 1 ^mm〜100_,外徑 〇.4刪~1.5細’其二之寬度範圍為 (^…-,而頭^”二虫”線圈“内徑約 約〇. 〇1咖〜0.15mm。 ° 1 1 3外徑亦略小於螺旋線圈1 2内徑 μ參閱第3、4圖’本發明之螺旋線圈i 2係供心線η奢g 5 201221166 穿於外部丄以提供心線工工的可操控性,為了確保組裝結合後心 線1 1之則段部1 1 1的可撓性及彎曲變形後的良好回復性,該 職線ϋ 1 2的製料段,雜不綱或轉性合金、自金等之 不透光線材,以捲繞或繞線製程製作出螺旋線圈丄2 ;於本實施 例中,該螺旋線圈i 2全長範圍為100mm〜5000mm,外徑範圍為 0. 3mm〜1. 8mm,内徑則略大於凸出鰭部i i 2及頭端部丄丄3外俨 約0. 01刪〜0· 15麵;為了使螺旋線圈丄2可與心線丄丄呈同軸心設 的操控性’其結合手段係將心線1 1套穿於螺旋 =L 得心線11之凸出籍部1 12及頭端部η 3以 同軸=頂抵於螺旋線圈i 2之内環面,其中並使螺旋線圈丄2至 ίΓ心線11之頭端部113,再將圈套於頭端部1 端部1 1 3以微電漿熔接(Micr〇plasmawel啊 二?f求狀,但不以此炼接成型方式為限’由於 和之凸出1成型有同轴心且略小於螺旋線圈12内 =凸υΐ 1 2及頭端部! i 3,不僅使心線i丄之 H 1於套穿螺旋、2時可便於導引及導正心線i ^ =11 1套穿螺旋線圈12,且當螺旋線圈丄2盥頭端部i丄 ,成型後,亦可保持於同軸心,以避免頭端部^ 3偏心13 ,控性;此外,本發明之導引線1 〇,其心線1 ϋ刖奴邛111因同軸心一體成型設有凸出鰭部丄 1 1 3 ’將使得整體面積慣性矩車交Α,而可增加手/、 =轉能力’以提高整體賴控性,且該凸岭部丨丨2以 力ϋϋ漸ί式縮小直徑之前段部111鄰接’亦可避免應 進而危及到人體的生命安全。 才而殘留狂后, 與心====〇由於螺卿2 體良好的操控性’而使導引線可易於推、拉 勿歧·變曲的血管中,並且準確的推送到患者的病變位置;、 1 N r 6 201221166 今、\a'表面塗佈技術如離子束製程,將不透光材料如 2專塗佈於凸出鰭部112之外環面,使得在放射線 ,顯示心線1 2的位置以及利用凸出鰭部112之 外裱面的寬度來量測病灶的尺寸。 柄制本發明醫療用導引線不僅可易於製作組裝,以大暢降 實;性及進步導以;=性及操控性,實為-深具 允符雜咖=,==目=獅蝴,從而 【圖式簡單說明】 % 第1圖 第2圖 弟3圖 第4圖 第5圖The bulging of the 'W 1 2 and the front end; = 2 ^ the second small diameter of the front section U. The progressively reduced diameter, in the present embodiment, the range is 0. 05 coffee ~ 1. 6 delete, the convex key ' 1 ^ Mm~100_, outer diameter 〇.4 ~~1.5 细 '''''' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' 3 outer diameter is also slightly smaller than the spiral coil 1 2 inner diameter μ see 3, 4 'the spiral coil i 2 of the present invention for the core line η luxury g 5 201221166 worn on the external 丄 to provide the maneuverability of the heartline workers In order to ensure the flexibility of the segment 1 1 1 after the assembly and the bonding of the core wire 1 1 and the good recovery after the bending deformation, the line segment of the line ϋ 1 2, miscellaneous or transition alloy, self 5mm〜1. The outer diameter of the spiral coil i 2 is from 100mm to 5000mm, the outer diameter range is 0. 3mm~1. 8mm, the inner diameter is slightly larger than the protruding fin ii 2 and the head end 丄丄3 outer 俨 about 0. 01 deleted ~ 0 · 15 faces; in order to make the spiral coil 丄 2 can be concentric with the heart 丄丄Maneuverability The core wire 11 is threaded over the inner corner surface of the spiral coil i 2 with the convex line portion 11 and the head end portion η 3 of the core line 11 coaxially = topped, and the spiral coil is twisted 2 to Γ 端 端 端 11 11 113 113 Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Γ Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi Mi The limit 'Because the protrusion 1 is formed with a concentricity and is slightly smaller than the inside of the spiral coil 12 = the protrusion 1 2 and the head end! i 3, not only makes the H 1 of the core line i 套 in the spiral, 2 It is convenient to guide and guide the positive core line i ^ =11 1 to pull through the spiral coil 12, and when the spiral coil 丄 2 盥 end portion i 丄, after molding, can also be kept at the concentricity to avoid the eccentricity of the head end portion 3 13 , controllability; in addition, the guide wire 1 本 of the present invention, the core line 1 ϋ刖 slave 邛 111 due to the coaxial core integrally formed with protruding fins 丄 1 1 3 ' will make the overall area of inertia moments , and can increase the hand /, = turn ability 'to improve the overall control, and the ridge 2 以 2 to narrow the diameter of the front section 111 adjacent 'can also avoid the human life Safety. After the residual madness, and the heart ====〇 because of the good controllability of the screw body 2, the guide wire can be easily pushed, pulled, deformed, and accurately pushed to the patient. The position of the lesion; 1 N r 6 201221166 Today, \a' surface coating technology such as ion beam process, the opaque material such as 2 is specially coated on the outer surface of the convex fin 112, so that the radiation is displayed The position of the heart line 12 and the width of the facet outside the convex fin 112 are used to measure the size of the lesion. The medical guide wire of the invention can not only be easily assembled and assembled, but also can be greatly reduced; the sexuality and the progress are guided; the sex and the manipulation are practically--the deep tolerance of the coffee ====目=狮蝴蝶, thus [simplified diagram] % 1st picture 2nd figure 3rd figure 4th figure 5th figure

為本國第1283591號發明專利案之示 本發明心線之示意圖。 “ 本發明心線與螺旋線圈之結合示意圖 本發明心線與螺旋線圈之結合示^ 本發明實施之示意圖。 、、 一 【主要元件符號說明】 習式部份: 1B :近手部 3:甜甜圈形狀体 111:前段部 1121:導弧角 114:手動部 1C :頭端部A schematic diagram of the present invention is shown in the invention patent No. 1,283,591. BRIEF DESCRIPTION OF THE DRAWINGS The combination of the core wire and the spiral coil of the present invention is shown in the schematic diagram of the implementation of the present invention. [1], [The main component symbol description] The following part: 1B: Near hand 3: sweet Donut shaped body 111: front section 1121: arcing angle 114: manual part 1C: head end

1 :心線 1 A :前段部 2:圈狀彈簧體 本發明部份: 2 1〇:導引線 1 1 ··心線 112:凸出鰭部 113:頭端部 12:螺旋線圈1 : Heart line 1 A : Front section 2: Ring spring body Part of the invention: 2 1〇: Guide line 1 1 ··Heart line 112: Projection fin 113: Head end 12: Spiral coil

Claims (1)

201221166 七 1 申請專利範圍·· -種醫療用導引線結構,其包括有: 心線:,於前段設有前段部,後段則設有手動部 f縮小直徑之細長桿狀,並於前段部 f二呈同軸心且適當間隔距離排列之凸出 螺旋線圈••係套穿於心線之外部,其5頁=续 面則頂抵於心線之凸出“,而與 :.;=為述:=, 依:ίίϋ範圍第1項所述之醫療用導引線結構,复中,詨 凸出ϋ部係以導弧角與漸進式縮小直徑之前段部鄰“ 4 · 利ί圍第1項所述之醫療用導引線結構,其中,更 ^ 心線之凸出韓部外環面塗佈有不透光材料。 5 專利翻第1項所述之醫療用導引線結構,1令,爷 螺疑線圈之外徑範圍為0.3mm〜18mm ^ = 6 凸出轉部及頭端部外獲約0. 01mm〜〇. 15mm。、J略大於〜線之 y種醫療用導引線製作方法,其包括有: 。線裝作手段.係將線材於其前段部製作出漸進式縮小直秤 之細長桿狀,並於環面上一體成型出至少一呈同軸: 且適當間隔距離排列之凸出鰭部以及於前端一 ^賴細魏圈,並使 έ士人其内杈略大於心線之凸出鰭部及頭端部; 結合手,:係將心線套穿於螺旋線_,並使心線之凸出鰭 部及頭端部以同軸心頂抵於螺旋線圈之内環面,再將 圈套於頭端部上之螺旋線圈與心線之頭端部熔接結合 一體,以使心線之凸出鰭部及頭端部可與螺旋線… 'L Ο i 201221166 持於同轴心。 7 ·,申請專利範圍第6項所述之醫療用料線 _,該心線製作手段係將彈性之、線材以化 讲;、 ί加=成型方式,製作出漸進式縮小直 狀以及同軸心之凸出,鰭部,以及同轴心之頭。 8·依申請專利範圍第6項所述之醫療用導引線製^ 程製作出職、_。 Ha線I 9 .依申請專利範圍第6項所述之醫療用導引線製作方去,苴 中,該結合手段係以微電漿熔接成型的方式^圈套於頭端、 上之螺旋線圈與心線之頭端部結合一體呈球狀。 1◦•依申請專利範圍第6項所述之醫療用導引線製作方直 中,更包含於該心線之凸出鰭部外環面以離子束势/欲: 不透光材料。201221166 VII 1 Patent Application Scope - · Medical guide wire structure, including: Heart line: The front section is provided in the front section, and the rear section is provided with the manual section f, the narrow rod shape of the reduced diameter, and the front section The convex spiral coils of f are concentric and arranged at appropriate intervals. • The sleeve is threaded on the outside of the heart line, and the 5 pages = the continuous surface is pressed against the convex line of the heart line, and with: .; Description: =, according to: ίίϋ range of the medical guide wire structure described in item 1, in the middle, the 詨 ϋ ϋ 以 以 导 导 导 导 导 导 导 导 导 4 4 4 4 4 4 4 4 4 4 4 4 4 4 The medical guide wire structure according to the item 1, wherein the outer ring surface of the Korean wire is coated with an opaque material. 5 〜 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 〇. 15mm. , J is slightly larger than the y-type medical guide wire manufacturing method, which includes: The wire is mounted as a means for making a progressively narrower straight scale of the wire in the front section thereof, and integrally forming at least one of the coaxial fins on the annulus: and the fins are arranged at appropriate intervals and at the front end ^Let the Wei circle, and make the gentleman's inner squat slightly larger than the convex line and the head end of the heart line; combined with the hand, the core thread is put on the spiral _, and the heart line is convex The fin portion and the head end portion are coaxially abutted against the inner annular surface of the spiral coil, and the spiral coil sleeved on the head end portion is welded and integrated with the end portion of the core wire to make the convex line of the core line protrude. And the head end can be concentric with the spiral... 'L Ο i 201221166. 7 · Applying the medical material line _ in the sixth paragraph of the patent application, the method of making the heart line is to make the elastic material and the wire material to be clarified; and to increase the straightening shape and the concentricity Protruding, fins, and the head of the concentric. 8. Manufactured according to the medical guideline system described in item 6 of the scope of application for patents, _. Ha line I 9 . According to the medical guide wire manufacturer described in item 6 of the patent application scope, in the middle, the bonding means is formed by micro-plasma welding, and the spiral coil is wound around the head end and the upper side. The end of the head of the heart line is integrated into a spherical shape. 1◦• According to the medical guide wire according to item 6 of the patent application scope, it is included in the outer ring surface of the convex fin of the core wire to have an ion beam potential: opaque material.
TW099141012A 2010-11-26 2010-11-26 Structure of medical leading wire and manufacture method thereof TW201221166A (en)

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TW099141012A TW201221166A (en) 2010-11-26 2010-11-26 Structure of medical leading wire and manufacture method thereof
CN2011102651605A CN102475936A (en) 2010-11-26 2011-09-08 Medical guide wire structure and manufacturing method thereof

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TWI633992B (en) * 2016-05-06 2018-09-01 台灣康匠製造股份有限公司 Plastic line manufacturing method with repeated shaping and manufacturing equipment thereof
CN108064180B (en) * 2016-12-26 2021-06-11 上海英诺伟医疗器械有限公司 Non-blood vessel cavity guide wire
CN111936193A (en) * 2018-03-30 2020-11-13 朝日英达科株式会社 Guide wire

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US5406960A (en) * 1994-04-13 1995-04-18 Cordis Corporation Guidewire with integral core and marker bands
US6428489B1 (en) * 1995-12-07 2002-08-06 Precision Vascular Systems, Inc. Guidewire system
US20040064069A1 (en) * 2002-09-30 2004-04-01 Reynolds Brian R. Medical device with support member
JP3694312B1 (en) * 2005-01-26 2005-09-14 朝日インテック株式会社 Medical guidewire
CN100518851C (en) * 2005-03-02 2009-07-29 泰尔茂株式会社 Guide wire
US20070185415A1 (en) * 2005-07-07 2007-08-09 Ressemann Thomas V Steerable guide wire with torsionally stable tip

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