M321300 八、新型說明： 【新型所屬之技術領域】 本創作關於針頭組件可# * 療用注射器，更明顧 /相内部的單次使用的醫 件意外過早卡人而#於具有可防止注射桿與針頭組 何口而致注射器報廢的構件的安全注射器。 【先砌技術】 者二 管接觸身體以防非故咅的針刺:防止使用過後之尖銳針 射哭係於伟用、仏 種單次使用的安全注 糸於使用注射器之後，手動地將針管縮入針筒内部。 縮入新型專利公告第357614號揭露一種針管可 的針座1\脈注射器，如圖1所顯示，該注射器忉 奸=載—根針管32且可縮回地安裝在針筒12之 °卩14内，針座的近端形成凹室35及二片相對向的掣 ㈣。注射桿20可在針筒㈣直線義且在活塞^ =成錐形釣部26。當使用者完成藥液的注射後，繼續推 聖/主射杯20往針官32的方向前進，釣部26可擠開掣棘 =而通過後者所形成的開口，再將注射桿Μ反向後退 時’鉤部26則被已回復原位的掣棘％卡住，此時，拉引 注射桿後退便可使針座連同針管縮入針筒内部，從而降低 使用者或其他人被使用過的針管意外札制可能性。不 J ：\menu\Pending-95\needle-95183-final.doc 5 M321300 過’為了預防鉤部26與掣棘36過早卡、士 4 使用就已報廢，該專利必須另外主射器尚未 保險扣片_便扣住注射桿20的==片= 動，等到要抽取藥液進入針筒 2者不月匕移 片18(如虛線所示）。 使用者才解開保險扣 这種注射㈣缺社—是紐扣 雜且不易製造，因為在生產組裝或= 本。又，在解門：i:? 分開而增加生產成 在解開保險扣片後，仍有在尚未吸入 針座與注射桿卡合，以致注射 柰液别誤使 性。此m ^ / 未使用就已報廢的可能 r此外在針座34的近端所形成的 — 藥液，也是一項長久以來的缺點成的凹至35會谷納殘餘 【新型内容】 15 20 本創作之-面向係在提供一種 部的安全注射器，其具有簡化 貝且件了鈿入針靖内 龟件音mi人的構可防止注射桿與針頭 件思外過早卡合而致注射器報廢。 依據本創作之醫藥用安全注射器，包含·· 一針筒’有—遠端及—近端，該遠端有第-播止部； 的斜座件’其包含一與該針筒的遠端形成液密接合 :放該針座上的針管，該針座具有-頂部、-開放知及一界定一容積之内表面； 動；:注射桿，其具有近端與遠端且可在該針筒内直線移 且包含一遠端表 舌基其女I於该注射桿的遠端上 J:\inenu\Pending-95\needie-95i83-final.doc 6 M321300 面’該針㈣魄面可與脑塞㈣端表面接合以在該二 表面間形成負壓區’藉此’當該針座的内表面與該活塞的 遠端表面在濕的情形下接合時，紐射桿可㈣該活塞連 ^該^座進人該針筒的近端，而#該針座的内表面與該活 乾的情形下接合時，該注射桿無法拉引該 針座進入該針筒的近端。 在注射器的組裝過程中不會干涉其他組件，*=二 广知：利技術的缺點。同時，只要注射器尚未吸入藥 二l:t=:注射器針頭縮入針筒而報廢的情況’ 本創作之安全崎H的針座亦可配備—輔助卡合裝 15 20 等因合，或因製造之公差配合或藥液 卡人夕 #貞l不足以拉下針頭時，增強針座與活塞 卞a力之用，以確保可拉下針頭。 【實施方式】 件之創作，本說明書中「遠端」—詞意指注射器組 離針的那—端’而「近端」意指注射器組件之最遠 端；「推入」-詞意指使注射桿朝針筒遠端移動， 抽出或拉回」-詞意指使注射桿朝針筒近端移動。 擋止部仏二.在其通端形成第一擋止部44與第二 弟一擒止部44係為環形徑向朝内突緣且足以 J:\menu\Pending-95\needle-95183-fmal.doc 7 M321300 表殳/主射壓力及該注射桿52之推力。第二擒止部呈产 形徑士向朝㈣雜，其被料為在以足夠大力量拉弓丨針二 ^針座48與第二擒止部46會產生變形而讓針座二 越過弟—擋止部46而進入針筒42近端。 10 15 20 針座48大體上為一圓蓋狀，具有大致平坦内表面49 士在内部定義一容積48，。針管50安裝在針座48之遠端 罪近邊緣處，穿過内表面49並與容積48，呈流體相通。針 座48與針筒42係成液密結合，在通常狀態，第一擋止部 4 4與第二擋止部4 6將針座4 8限制於針筒4 2的遠端^立置。 注射桿52可在針筒42内直線移動且在其遠端中央 凹穴53。 、 彈性材料製造的活塞54的近端中央有一凸部％可私 入凹穴53内以與注射桿52結合。活塞54的遠端表面^ 括略呈下凹的圓形中央表面56，及較高的周圍表面57。 以下敘述本創作之注射器40的操作方式及動作原理。 芩圖3，在針筒42已吸入藥劑並施行注射，活塞54 進入針座48内，彈性的活塞54的遠端表面可受注射桿％ 的推壓而幾乎完全接觸針座48的内表面49，因此幾乎無 藥液殘留在容積48,内。當開始拉回注射桿52之際，注身^ 桿52優先施拉力於活塞54的中央凸大部％，造成活塞 54的中央表面56優先脫離針座48的内表面49，形成容 積48，但是較高的周圍表面57此時仍然貼住針座48的 内表面49周圍而封住針管5〇的末端開口 5〇,，而阻絕容 知48與大氣壓力的連通，因而在活塞54的遠端表面與針 座48的内表面49間（包括容積48，)產生負壓，致使大氣壓 J:\menu\Pending-95\needle-95183-fmal.d< 8 25 M321300 力將針座48與活塞54壓合在一起，此種作用如b 口： ==面一般。再者，因為活塞54的遠端表面二 的内表面49間處於溼的情形，此種溼情形下 土 於乾情形下的負壓。依據本創作，藉由濕情形下 48與活塞54壓合在—起的力量足以克服針座48 與針筒42内壁間的磨擦力，且使針座牝與第二 λ 產生變形而讓針座48被注射桿52拉弓丨而越 ^二6 46,進入針筒42近端内部（參圖4)，因而防H » 於注射後誤傷人員的危險。 、+β 50 現在說明若在針筒42未吸人藥劑前，誤將活塞 入容積48,中而使活塞54與針座48接觸的情形 3)二時因活塞54的遠端表面與針座48的内表面二 15 20 =樂故活塞54的遠端表面與針座48的内表面49 括谷積48，)在乾燥情形下所產生 =48與活塞54壓合在-起的力量來克服二48 產42内壁間的磨擦力、及使針座48 46 4 回'主射柃52時，針座48碰觸第二擒止部 針^’0=·^ 4_活塞54 ’因此不會將未使用的 針吕50隨注射桿52—起縮人針筒42中的情況。 端面52的的連接位置為在活塞54近端 54中=Λ為佳，以利於抽組射桿52時使活塞 巧缘二^^優先承受拉桿拉力，如此利於活塞54的 周緣封住=50的末端開口 50,而能確保氣密。 Μ貝知例係針對針”裝於靠近針座雜型式的注 J:\menu\Pending-95\needle-95183-final.doc 9 25 M321300 射為（一般是較大型的注射器）。下述實施例將敘述 a 裝於針座中心型式的注射器（-般是較小型的注射器^女 圖5顯示本創作另一較佳實施例的注射器6〇，它 圓筒狀針筒62,針筒62在其遠端形成第―擒止部64 5 部66。第—擒止部64可承受注射壓力及注射桿、幻 針座68本體為大致圓蓋狀，具有大致平坦内表面69 A在内表面69中央位置朝遠端突出之大致圓形 籲 69a，且在針座68内部定義一容積的，。針f %安裝在: ίο 座68之凹部69a上並與容積68，間係流體連通。針座 與針筒62係形成液密結合。在通常狀態，第_擒止部糾 與第二擋止部66將針座68限制於針筒62的遠端位置。 注射桿72可在針筒Μ内直線移動且其遠端有 突緣73。 〜 15 活塞74由雜㈣製造，其近端具有環形朝内突緣 75可卡住注射桿72的環形突緣73以與注射桿72結合、、。 _ 活塞74的遠端端面中央設有對應於針座68之内表面69 肖凹部69a的形狀的朝外突部76,而近端端面中央則相應 地形成凹室76’。凹室76,透過注射桿72與活塞％間的縫 2〇 隙78而可與大氣相通。 以下敘述注射器60的操作方式及動作原理。 參圖6，若在針筒62已吸入藥液並施行注射後，活塞 74進入針座68内，彈性的活塞74的遠端表面可受注射桿 72的推壓而幾乎完全接觸針座Μ的内表面69與凹部 J:\menu\Pending-95\needle-95183-fmal.doc 10 M321300 69a，因此幾乎無藥液殘留在容積68，内。當開始拉回注射 桿72之際，注射桿72施加拉力於活塞74的周圍突緣75, 但是，因活塞的突部76接觸針座68的凹部69a而封住針 管70的末端開口 70，，阻絕凹部69a與大氣的連通，而在 5 活塞74的近端側，容積76,與大氣連通。因此，在活塞 74的达端表面與針座68的内表面69與凹部69a間產生負 壓，因為活塞74的遠端表面與針座68的内表面間處於溼 的情形，此種溼情形下的負壓遠大於乾情形下的負壓。類 丨似前一個實施例，針座68與活塞74在此情下被緊密壓合 10 一起，其壓合之力足以令繼續抽出注射桿時，針座68在 不脫離活塞74的情況使第二擋止部66產生變形，允許針 座68連同針管70隨同注射桿縮入針筒62内部（參圖 4)，預防針管70於注射後誤傷人員的危險。 若在針筒62未吸入藥液前，誤將活塞74推入容積68, 15 中而使活塞74與針座68結合（參圖6)，此時因活塞74 與針座68間的接觸面無藥液，隨後在拉回注射桿72時， | 因活塞74與針座68間在乾情形下負壓力較小，又第二擋 止部66被設計為在此狀況下足以擋住針座邰而使活塞7"4 脫離針座68，因此不會將未使用的針管縮入針筒以中。 2〇 在上述兩實施例中，針筒中之第二擋止部作成一圈環 形肋’替代方式包括在針座與針筒二者之接觸面間設置能 產生適當磨擦接合力之手段，例如習知一或多數圈環形 肋，或配合其它結構而根本不設置第二擋止部（下述）。 然而，例如在使則、型針筒的場合，因針筒本身容積較 " 小，或因製造公差配合、藥液等因素，可能在注射完成後， J :\menu\Pending-95\needle-95183-final.doc 11 M321300 抽出注射桿時，針座與活塞之間所生的負壓不足以將針頭 拉入針筒。針對此問題，圖8所顯示的實施例提出一較佳解 決方案。在此實施例之注射器80中，原圖2中所示之針筒 42的第二擋止部46已被取消，而圖2中的第一擋止部44 則被代替為由斜面84a及平面84b所形成的徑向朝内凸出 的擋止部84。同時，針座88的頂部89周緣亦被修改為與 擋止部84成互補狀的凹部以與之嗡合，藉此達到可單方 向釋放地定位針座88的功能，即針座88可被釋放而朝針 筒近端移動，但無法朝針筒遠端釋放或移動。 又，針座88的底部開放端設置第一卡合部88a，再隔 一距離處設置第二卡合部88b，此距離需能使活塞94於拉 伸狀態下使活塞座92a與第一卡合部88a卡合（圖1〇)， 及使活基94於壓縮狀態下使活塞座92a與第二卡合部88b 卡合（圖11)。活塞座92a —體設置於注射桿92遠端，其 直徑約等於或略小於針座88的内徑，材質一般為塑膠， 故不會像活塞的橡膠材質容易變形，而可確實與卡合部卡 合。 第二卡合部88b係一端連結於針座88中，另一端為 可動自由端，其於通常未受壓的狀態下係自針座的内 表面徑向朝内。當受壓時，第二卡合部88b即沒入對應的 凹部88c中，最多可達與針座88的内表面齊平。第—^ 合部88a及弟一卡合部88b分別可以連續方式（即形成環 圈）或間斷方式（如每隔180。設2個或每隔120。設3個 等）形成。 接者説明弟 ^合部及第二卡合部的作動原理：參圖 J:\menu\Pending-95\needle-95183-final.doc 12 M321300 9，在針筒82已吸入藥劑並施行注射，並在活塞94進入 針座88内，且活塞座92a已通過第一卡合部88a但尚未 :通過第二卡合部88b時即拉回注射桿92(此時第二卡合部 88b被活塞94或活塞痤92a的周緣壓入凹部88c中），活 基94將因其退端96被負壓吸引而被縱向拉伸，使得活塞 座92a與針座88的第一卡合部88a二者緊密卡合而一起 移動。故此時縱使負壓產生不足，只要卡合力夠大，針頭 90仍可隨針座88縮入針筒82中（圖1〇)。 但若負壓不足的情況更為嚴重，有可能圖9所示針座 與活塞的卡合方式仍不足以拉回針座。此時，需將注射桿 92再次推向注射方向（即朝針頭9〇之方向）以使活塞 文壓縮，直到活塞座92a通過第二卡合部88b後，第二卡 合部88 b即彈出，而抵住活塞座92a。因為活塞舛在此係 以縱向壓縮狀態迫使活塞座92a與第二卡合部8扑卡合， 15 20 此卡合狀態比圖9所示卡合狀態要來的緊密些（參圖 11)故此％再將注射桿92拉出，針頭90即可隨針座88 細入針筒82中（參圖12)。因要使活塞與第二卡合部卡合 的力運較大，故於未注射前的誤動作一般不會導致針 外被拉入針筒中。 心 上述圖8至圖12所示實施例的結;^雖特別適合用於 小尺寸的針筒，但實際上不限於此，大尺寸的針筒亦可採 以在因製造之公差配合或藥液等因素導致負壓不足 無法拉下針座時，作為補救之辅助裝置。又，圖8至圖12 貫施例所揭露的結翻樣適用於如圖5至圖7所示的針頭 位於針座中央時的結構。 、員 J:\menu\Pending-95\needle-95183-fi osl.doc 13 25 M321300 點n ^ \當可由上述揭露瞭解本創作^ 射器舒頭镑尚未吸入藥液，就不會產生誤游注 器也且有涛而報廢的情況。顯然的，本劍作的注射 、有减夕樂液殘餘在針筒内的優點。 例夫^本㈣書就目前認4最實㈣方歧較佳资;^ ==::=’習於此技藝者應了解可在= 利 【圖式簡單說明】 圖1係習知注射器的剖視圖； 圖2係本創作之注射器的縱剖視圖； 圖；圖3係圖2注射器的注射桿與針座結合時的放大剖面 圖4顯示圖2注射器的針頭縮人針筒時的縱剖面圖. 圖5係本創作之注射器第二實施例的縱剖視圖；， 圖；圖6係圖5注射器的注射桿與針座結合時的放大剖面 圖7顯示圖5注射器的針頭縮人針筒時的縱剖面圖； 圖8係本創作之，主射為第三實施例的的縱剖視圖. 圖9係圖8注射器的活塞座與針座之第卡人 圖10顯示圖9注射器的針頭縮入針筒時的縱剖面圖； ^ 11係® 8注射ϋ的活塞軸針座 合的放大剖面圖；及 卜口 Η卞 J:\menu\Pending-95\needle-95183-final.doc 14 M321300 圖12顯示圖11注射器的針頭縮入針筒時的縱剖面 圖0 【圖式之主要元件符號說明】M321300 VIII, new description: [New technology field] This creation about the needle assembly can be # * therapeutic syringe, more aware / internal single-use medical parts accidentally premature card people and # can have prevent injection A safety syringe for the components of the rod and needle group that cause the syringe to be scrapped. [First build technology] The second tube touches the body to prevent the acupuncture of the non-defective: prevent the sharp needle after the use of the crying is used in the safety of the single use, the single use of the syringe, after the syringe is used, manually the needle Retract inside the syringe. Retraction of the new patent publication No. 357614 discloses a needle cannula 1 pulsing syringe, as shown in Fig. 1, which is smothered and loaded with a needle 32 and retractably mounted on the barrel 12 Inside, the proximal end of the hub forms an alcove 35 and two opposing turns (four). The injection rod 20 can be straight in the syringe (four) and in the piston ^ = into the tapered fishing portion 26. After the user completes the injection of the liquid medicine, the pusher/main shot 20 is continued to advance in the direction of the needle 32, and the fishing portion 26 can squeeze the open spine to pass through the opening formed by the latter, and then reverse the injection rod. When retracting, the hook portion 26 is caught by the stalks that have been restored to the original position. At this time, pulling the injection rod back can retract the needle holder and the needle tube into the inside of the syringe, thereby reducing the use of the user or others. The possibility of needle tube accidental construction. No J :\menu\Pending-95\needle-95183-final.doc 5 M321300 After 'preventing the hook 26 and the thorns 36 from prematurely, the card 4 has been scrapped, the patent must be additionally insured. The clasp _ clasps the == slab of the injection rod 20, and waits until the medicinal solution is to be drawn into the syringe 2, which is not shown in the stencil (as indicated by the dashed line). The user unlocks the insurance button. This injection (4) lacks the body - it is a button and is not easy to manufacture because it is assembled in production or = this. Also, in the solution: i:? separate and increase production. After unfastening the safety clasp, there is still a needle that has not been inhaled and the injection rod is engaged, so that the injection of sputum is not misleading. This m ^ / possible unused r that has not been used is also formed at the proximal end of the needle holder 34 - the liquid medicine is also a long-standing disadvantage of the concave to 35 will be the residual of the valley [new content] 15 20 The creation-oriented is to provide a kind of safety syringe, which has the structure of simplifying the shell and inserting the needle into the needle to prevent the injection rod from being prematurely engaged with the needle and causing the syringe to be scrapped. The medical safety syringe according to the present invention comprises: a syringe having a distal end and a proximal end, the distal end having a first-to-stent portion; the oblique member 'containing a distal end of the syringe Forming a liquid-tight joint: placing a needle tube on the needle holder, the needle holder having a top portion, an open surface, and an inner surface defining a volume; an injection rod having a proximal end and a distal end and at the needle The cylinder is linearly moved and includes a distal tongue base and the female I is on the distal end of the injection rod J:\inenu\Pending-95\needie-95i83-final.doc 6 M321300 face 'the needle (four) face can be The cerebral plug (four) end surface is joined to form a negative pressure zone between the two surfaces 'by this' when the inner surface of the hub is engaged with the distal surface of the piston in a wet condition, the button can be (four) the piston ^ The seat is inserted into the proximal end of the barrel, and when the inner surface of the needle seat is engaged with the dry condition, the injection rod cannot pull the needle holder into the proximal end of the barrel. It will not interfere with other components during the assembly process of the syringe, *= 2 widely known: the shortcomings of the technology. At the same time, as long as the syringe has not been inhaled, the drug ll:t=: the syringe needle is retracted into the syringe and scrapped. 'The safety seat of the creation of H is also equipped with auxiliary card assembly 15 20, etc., or because of manufacturing The tolerance fit or the liquid medicine card person 夕#贞l is not enough to pull the needle down, strengthen the needle seat and the piston 卞a force to ensure that the needle can be pulled down. [Embodiment] In the present specification, "remote" - the word means that the syringe group is away from the end of the needle and "proximal" means the farthest end of the syringe assembly; "push in" - the word means The injection rod moves toward the distal end of the barrel, withdrawing or pulling back. The word means moving the injection rod toward the proximal end of the barrel. The stopper portion .2 is formed at the through end thereof with the first stopper portion 44 and the second buddy portion 44 being annular and radially inwardly protruding and sufficient for J:\menu\Pending-95\needle-95183- Fmal.doc 7 M321300 Table/main shot pressure and thrust of the injection rod 52. The second stop is in the shape of a slanting dynasty (four) miscellaneous, which is expected to be pulled with sufficient force to pull the bow and the needle 2 and the second stop 46 will deform and let the needle seat cross over the younger brother. - The stop 46 enters the proximal end of the barrel 42. The 10 15 20 needle hub 48 is generally a dome-shaped shape having a generally flat inner surface 49 defining a volume 48 therein. The needle 50 is mounted at the distal end of the needle hub 48 at the proximal edge, through the inner surface 49 and in fluid communication with the volume 48. The needle hub 48 is in fluid-tight engagement with the syringe 42. In the normal state, the first stopper portion 44 and the second stopper portion 46 restrict the needle holder 48 from the distal end of the syringe 42. The injection rod 52 is linearly movable within the barrel 42 and has a central pocket 53 at its distal end. The center of the proximal end of the piston 54 made of elastic material has a convex portion % which can be recessed into the recess 53 to be combined with the injection rod 52. The distal surface of the piston 54 includes a slightly concave circular central surface 56 and a relatively high peripheral surface 57. The operation mode and operation principle of the syringe 40 of the present invention will be described below. Referring to Figure 3, the syringe 42 has been inhaled and injected, and the piston 54 has entered the needle hub 48. The distal surface of the resilient piston 54 is urged by the injection rod % to almost completely contact the inner surface 49 of the needle hub 48. Therefore, almost no liquid remains in the volume 48. When the injection rod 52 is initially pulled back, the body rod 52 preferentially exerts a pulling force on the central convex portion of the piston 54, causing the central surface 56 of the piston 54 to preferentially disengage from the inner surface 49 of the needle hub 48, forming a volume 48, but The higher peripheral surface 57 now remains against the inner surface 49 of the hub 48 to seal the end opening 5 of the needle 5, thereby blocking communication of the volume 48 with atmospheric pressure and thus at the distal end of the piston 54. The surface and the inner surface 49 of the hub 48 (including the volume 48) create a negative pressure, resulting in an atmospheric pressure J:\menu\Pending-95\needle-95183-fmal.d<8 25 M321300 force the hub 48 and the piston 54 Press together, this effect is as follows: b = = face. Further, since the inner surface 49 of the distal end surface 2 of the piston 54 is wet, this wet condition is a negative pressure in the dry condition. According to the present invention, the force of pressing against the piston 54 in the wet condition 48 is sufficient to overcome the friction between the needle hub 48 and the inner wall of the barrel 42, and the needle seat and the second λ are deformed to allow the needle holder 48 is pulled by the injection rod 52 and the other 2 6 46, enters the proximal end of the syringe 42 (refer to Figure 4), thus preventing H from injuring the person after the injection. , +β 50 Now, if the piston 42 is accidentally inserted into the volume 48 before the syringe 42 is sucked, the piston 54 is brought into contact with the needle holder 48. 3) The distal end surface of the piston 54 and the needle seat are used. The inner surface of the 48 is two 15 20 = the distal surface of the piston 54 and the inner surface 49 of the hub 48 are valleyd 48, which is produced in the dry condition = 48 and the force of the piston 54 is pressed to overcome The friction between the inner wall of the 42nd 42 is made, and when the needle seat 48 46 4 is returned to the 'main shot 52, the needle seat 48 touches the second stop pin ^'0=·^ 4_piston 54' so it will not The unused needle 50 is slid into the barrel 42 with the injection rod 52. The connecting position of the end surface 52 is preferably in the proximal end 54 of the piston 54 to facilitate the pulling of the rod 52 to preferentially withstand the pulling force of the rod, so that the peripheral edge of the piston 54 is sealed = 50. The end opening 50 ensures airtightness. The mussel knows that the needle is mounted on the needle near the needle holder type J:\menu\Pending-95\needle-95183-final.doc 9 25 M321300 shot (usually a larger syringe). For example, a syringe mounted in the center of the needle hub (generally a smaller syringe) will be described. Figure 5 shows a syringe 6 of another preferred embodiment of the present invention, a cylindrical syringe 62, and a syringe 62 The distal end forms a first stop portion 64 5 portion 66. The first stop portion 64 can withstand the injection pressure and the injection rod, the magic needle seat 68 body has a substantially dome shape, and has a substantially flat inner surface 69 A on the inner surface 69 The central portion protrudes toward the distal end by a generally circular recess 69a, and defines a volume inside the hub 68. The needle f% is mounted on the recess 69a of the seat 68 and is in fluid communication with the volume 68. In a normal state, the first stop portion and the second stop portion 66 restrict the needle holder 68 to the distal end position of the syringe 62. The injection rod 72 can be inside the syringe barrel It moves straight and has a flange 73 at its distal end. ~ 15 The piston 74 is made of miscellaneous (four), and its proximal end has a ring-shaped inward flange 75 that can be stuck. The annular flange 73 of the shooting rod 72 is coupled to the injection rod 72. The center of the distal end surface of the piston 74 is provided with an outwardly projecting portion 76 corresponding to the shape of the concave portion 69a of the inner surface 69 of the needle holder 68, and The center of the end face is correspondingly formed with an abutment 76'. The recess 76 is open to the atmosphere through the slit 2 between the injection rod 72 and the piston %. The operation mode and operation principle of the syringe 60 will be described below. If the piston 74 enters the needle hub 68 after the syringe 62 has inhaled the drug solution and the injection is performed, the distal end surface of the elastic piston 74 can be pressed by the injection rod 72 to almost completely contact the inner surface 69 of the needle hub. With the recess J:\menu\Pending-95\needle-95183-fmal.doc 10 M321300 69a, almost no liquid remains in the volume 68. When the injection rod 72 is pulled back, the injection rod 72 applies a pulling force to The peripheral flange 75 of the piston 74, however, closes the end opening 70 of the needle tube 70 by the projection 76 of the piston contacting the recess 69a of the needle holder 68, blocking the communication of the recess 69a with the atmosphere, and at the proximal end of the 5 piston 74. Side, volume 76, in communication with the atmosphere. Therefore, at the end surface of the piston 74 and the hub 68 A negative pressure is generated between the surface 69 and the recess 69a because the distal surface of the piston 74 is wet with the inner surface of the hub 68, and the negative pressure in such a wet condition is much greater than the negative pressure in the dry condition. In the previous embodiment, the needle hub 68 and the piston 74 are in this case tightly pressed together 10, and the force of the pressing force is sufficient to allow the needle holder 68 to be secondly stopped without leaving the piston 74 when the injection rod is continuously withdrawn. The portion 66 is deformed to allow the needle hub 68, along with the needle tube 70, to retract into the interior of the syringe 62 along with the injection rod (see Figure 4), preventing the needle tube 70 from injuring the person from injury after injection. If the syringe 62 is not sucked into the volume before the syringe 62 is inhaled, the piston 74 is accidentally pushed into the volumes 68, 15 to engage the piston 74 with the hub 68 (see Fig. 6), at which time the contact surface between the piston 74 and the hub 68 is present. Without the drug solution, then when the injection rod 72 is pulled back, | because the negative pressure between the piston 74 and the needle holder 68 is small in the dry condition, and the second stopper portion 66 is designed to be sufficient to block the needle seat in this condition. The piston 7" 4 is disengaged from the needle hub 68, so that the unused needle tube is not retracted into the syringe. 2 In the above two embodiments, the second stop portion of the syringe is formed as a ring of annular ribs. The alternative includes providing a means for generating a proper frictional engagement force between the contact faces of the needle hub and the syringe, such as Knowing one or more annular ribs, or matching other structures, does not provide a second stop (described below) at all. However, for example, in the case of a syringe or a syringe, the volume of the syringe itself is smaller, or due to manufacturing tolerances, chemical liquid, etc., may be after the injection is completed, J:\menu\Pending-95\needle -95183-final.doc 11 M321300 When the injection rod is withdrawn, the negative pressure generated between the needle seat and the piston is not sufficient to pull the needle into the syringe. In response to this problem, the embodiment shown in Figure 8 presents a preferred solution. In the syringe 80 of this embodiment, the second stopper portion 46 of the syringe 42 shown in Fig. 2 has been eliminated, and the first stopper portion 44 in Fig. 2 is replaced by the inclined surface 84a and the plane. 84b is formed by a radially inwardly projecting stop 84. At the same time, the circumference of the top 89 of the needle hub 88 is also modified to be engaged with the recessed portion 84 to be engaged with the recessed portion 84, thereby achieving the function of locating the needle holder 88 in a single direction, that is, the needle holder 88 can be Releases and moves toward the proximal end of the syringe, but cannot be released or moved toward the distal end of the syringe. Moreover, the first open end 88a of the needle base 88 is provided with a first engaging portion 88a, and the second engaging portion 88b is disposed at a distance, which is required to enable the piston 94 to extend the piston seat 92a and the first card in a stretched state. The engaging portion 88a is engaged (Fig. 1A), and the piston 94a is engaged with the second engaging portion 88b in the compressed state (Fig. 11). The piston seat 92a is disposed at the distal end of the injection rod 92, and has a diameter equal to or slightly smaller than the inner diameter of the needle seat 88. The material is generally plastic, so the rubber material of the piston is not easily deformed, but can be surely engaged with the engaging portion. Engage. The second engaging portion 88b is coupled to the hub 88 at one end and the movable free end at the other end, which is radially inward from the inner surface of the hub in a normally uncompressed state. When pressed, the second engaging portion 88b is immersed in the corresponding recess 88c up to the flush with the inner surface of the hub 88. Each of the first and second engaging portions 88a and 88b may be formed in a continuous manner (i.e., forming a loop) or in a discontinuous manner (e.g., two or every 120, three or the like). The receiver explains the operation principle of the brother and the second engaging portion: refer to the figure J:\menu\Pending-95\needle-95183-final.doc 12 M321300 9, the syringe 82 has been inhaled and the injection is performed. And the piston 94 enters the needle hub 88, and the piston seat 92a has passed the first engaging portion 88a but has not yet pulled back the injection rod 92 when passing through the second engaging portion 88b (when the second engaging portion 88b is piston 94 or the circumference of the piston bore 92a is pressed into the recess 88c), the active base 94 will be longitudinally drawn by the suction end 96 being attracted by the negative pressure, so that the piston seat 92a and the first engaging portion 88a of the hub 88 are both Move tightly together and move together. Therefore, even if the negative pressure is insufficient, the needle 90 can be retracted into the barrel 82 with the needle holder 88 as long as the engaging force is large enough (Fig. 1A). However, if the situation of insufficient pressure is more serious, it may be that the manner in which the needle holder and the piston are engaged as shown in Fig. 9 is still insufficient to pull back the needle holder. At this time, the injection rod 92 needs to be pushed again in the injection direction (ie, in the direction of the needle 9〇) to compress the piston, until the piston seat 92a passes through the second engaging portion 88b, and the second engaging portion 88b is ejected. And against the piston seat 92a. Because the piston yoke forces the piston seat 92a to engage with the second engaging portion 8 in the longitudinal compression state, the engagement state of the piston 20 is closer than that of the engagement state shown in FIG. 9 (refer to FIG. 11). %, the injection rod 92 is pulled out again, and the needle 90 can be finely inserted into the barrel 82 with the needle holder 88 (see Fig. 12). Since the force of engaging the piston with the second engaging portion is large, the malfunction before the injection is generally not caused to be pulled into the syringe. The above-mentioned embodiment of the embodiment shown in FIGS. 8 to 12 is particularly suitable for a small-sized syringe, but is not limited to this. The large-sized syringe can also be used in the tolerance of manufacturing or medicine. When the liquid and other factors cause the negative pressure to be insufficient to pull down the needle holder, it is used as an auxiliary device for remediation. Further, the knots disclosed in the embodiments of Figs. 8 to 12 are applied to the structure in which the needle shown in Figs. 5 to 7 is located at the center of the hub. , J:\menu\Pending-95\needle-95183-fi osl.doc 13 25 M321300 point n ^ \When the above disclosure reveals that the creation of the gun is not inhaled, it will not cause misunderstanding The injector also has a situation of being scrapped. Obviously, the injection of this sword has the advantage of the residual eve liquid in the syringe. The case of this case (4) is currently recognized as the most realistic (four) square difference; ^ ==::=' Learners of this skill should know that it can be used in = [simplified description] Figure 1 is a conventional syringe Figure 2 is a longitudinal sectional view of the syringe of the present invention; Figure 3; Figure 3 is an enlarged cross-sectional view of the injection rod of the syringe of Figure 2 when combined with the needle holder. Figure 4 shows a longitudinal section of the needle of the syringe of Figure 2. Figure 5 is a longitudinal cross-sectional view of a second embodiment of the syringe of the present invention; Figure 6 is an enlarged cross-sectional view of the injection rod of the syringe of Figure 5 in combination with the needle holder. Figure 7 shows the longitudinal direction of the needle of the syringe of Figure 5. Figure 8 is a longitudinal sectional view of the third embodiment of the present invention. Figure 9 is the card holder of the piston seat and the needle seat of the syringe of Figure 8. Figure 10 shows the needle of the syringe of Figure 9 retracted into the syringe Longitudinal section of the time; ^ Magnified sectional view of the piston shaft of the 11 Series® 8 injection ;; and 卜口Η卞J:\menu\Pending-95\needle-95183-final.doc 14 M321300 Figure 12 shows Fig. 11 is a longitudinal sectional view of the syringe needle retracted into the syringe 0 [Description of the main components of the drawing]
元件代號 名稱 10 注射器 12 針筒 14 插接部 18 保險扣片 20 注射桿 26 釣部 28 推片 32 針管 34 針座 36 掣棘 40 注射器 42 針筒 44 第一擂止部 46 第二擂止部 48 針座 48， 容積 49 内表面 J:\menu\Pending-95\needle-95183-final.doc 15 M321300Component code name 10 Syringe 12 Syringe 14 Plug-in part 18 Safety clasp 20 Injection rod 26 Fishing part 28 Pusher 32 Needle 34 Needle seat 36 Spine 40 Syringe 42 Syringe 44 First stop 46 Second stop 48 needle holder 48, volume 49 inner surface J:\menu\Pending-95\needle-95183-final.doc 15 M321300
50 針管 50， 末端開口 52 注射桿 53 凹穴 54 活塞 55 中央凸大部 56 中央表面 57 周圍表面 60 注射器 62 針筒 64 第一擋止部 66 第二擋止部 68 針座 68， 容積 69 内表面 69a 凹部 70 針管 70， 末端開口 72 注射桿 73 突緣 74 活塞 75 突緣 76 突部 J:\menu\Pending-95\needle-95183-fmal.doc 16 76,M321300 76, 78 80 82 84a 凹室 容積 縫隙 注射器 針筒 斜面50 needle 50, end opening 52 injection rod 53 pocket 54 piston 55 central convex portion 56 central surface 57 peripheral surface 60 syringe 62 syringe 64 first stop 66 second stop 68 needle hub 68, volume 69 Surface 69a Recess 70 Needle 70, End opening 72 Injection rod 73 Flange 74 Piston 75 Flange 76 Projection J: \menu\Pending-95\needle-95183-fmal.doc 16 76, M321300 76, 78 80 82 84a Concave Chamber volume slit syringe needle bevel
84b 平面 84 擋止部 88 針座 88a 第一卡合部 88b 第二卡合部 88c 凹部 89 頂部 90 針頭 92a 活塞座 92 注射桿 94 活塞 96 遠端 J :\menu\Pending-95\needle-95183-fmal.doc 1784b plane 84 stop 88 needle seat 88a first engagement portion 88b second engagement portion 88c recess 89 top 90 needle 92a piston seat 92 injection rod 94 piston 96 distal end J:\menu\Pending-95\needle-95183 -fmal.doc 17