201249494 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種一次性注射器’特別是指一種在 使用後可將針頭回拉至針筒内的一次性注射器。 【先前技術】 為避免給人類或動物輸入或取出介質時發生交叉减染 ，皮下注4Φ器必須一次性使用’在使用後即作&垃圾處理 。目前使用最多的一次性注射器是由空腔筒體、 裝配在筒體内的定程活塞組成。這種注射器所存在的最大 問題是注射完畢之後’其針頭仍留在外面，不僅為注射器 垃圾的搬運、銷毀處理帶來不便，同時可能因不慎而紮傷 醫護人員，造成病菌的二次交又感染，成為—個不能忽視 的醫療隱患，因此出現了針頭可回縮的一次性注射器。 ”中國專利⑽細公開了 “―種安全自μ用注射器 ”，包括針筒和針座，其中針筒和針座通過設置在針座外 側的環形凸台和設置在針筒内側的環形凹槽相互連接，這 種結構的缺陷在於手動後拉針座時，使環形凸台與環形凹 槽相互脫離需克服的阻力很大’十分費力且不好操作，另 外會造成裝配困難’裝配時容易因用力過猛而使環形凸台 直接越過環形凹槽而導致裝配失敗。 PCT專利申請pCT/CN2⑽觸52〇公開了 “針尖可回縮 人吐女王；主射g ’其中通過針座和針筒間的止位元凸 台結構和自毁稽條來使針座相對針筒定位。自毀擋條的支 撐腳連接在針筒内側的凹座中，在針座回縮的過程中，自 201249494 毀檔條受力變形與凹座脫離連接，從而允許針座回縮進入 針筒内。這樣的結構仍然存在一些缺陷，如裝配時需使自 毀擋條的支撐腳與針筒上的凹座對準並插入，增加了裝配 的難度。注射時自毀擋條對針座的支撐力不夠，使得注射 時針頭不夠穩定，且針座回縮的過程仍然需要克服止位元 凸台造成的阻力。 在注射過程中，針頭會受到被注射者肌體的反作用力 而對針座產生向針筒内的壓力，這時要求針座受到足夠的 支樓以保持穩I與之相反，在注射完畢，回拉針頭時， 則希望針座回縮的過程受到儘量少的阻力。 因此，本領域的技術人員致力於開發一種裝配方便、 針頭和針座在注射時穩定、注射後回拉時阻力小的一次性 注射器。 【發明内容】 T鑒於現有技術的上述缺陷，本發明所要解決的技 問題是提供—種在注射時針座保収_定，而在注射 畢後，又旎很輕鬆地將針座和針頭拉回針筒的一次性注 。 為實現上述目的，本發明提供了一種—次性注射器， 包括針座、針筒和芯杆，還包括帶有中心、通孔的支撐件， 支撐件連接在針筒的㈣上，針座被保持在針筒和支樓件 =間’在注射時，支撐件在第一受力位置受到來自針座的 4的力’在第二受力位置受到來自針筒的向上的力 党力位置和第二受力位置均位於或鄰近支撐件的周緣或 4 201249494 注射完畢，回拉料時，支撐件在第三受力位置 :門，笛=的向下的力’使得支樓件和針筒之間的連接 幵二党力位置位於支撐件的中央部位。 二:：的較佳實施方式中，支樓件為圓形、花瓣狀 、條狀或輻射狀。 。在本發明的另—較佳實施方式中，支擇件為圓形薄片 支稽·件具有向針座 支撐件具有向針座 在本發明的另—較佳實施方式中 凸起的球面或弧面。 在本發明的另—較佳實施方式中 凸起的傘形面。 支撐件至少有一 支撐件上至少有 部 在本發明的另—較佳實施方式中 分比其他部分更薄。 在本發明的另一較佳實施方式中， 部分具有與其他部分更大的彈性或柔性 在本發明的另一較佳實施 备认緣人μ ^ 对座的底端面自j： 最外緣向針座的中心通孔逐漸凹進。 - 在本發明的另一較佳實施方式 Λβ i* 4* -η. ^ Ύ 支撐件的周緣或端 4連接在设置在針筒内側的環形凹槽或凹座内。 在^日^另—較㈣施方式中在芯杆 ^ 一種結構，該結構包括依次相連的片 _又 阻擋部’片狀部可在朝向或背 員狀。Μ. 狀部的直徑大於阻浐邱… 4的方向上偏轉，片 入孓阻心邛的直控’頸狀部 和阻擋部的直徑，且頸狀 ；狀部 度’ 亦即片狀部和阻擋部 201249494 之間的間隔距離被設置為當片狀部朝向阻擋部偏轉時， 狀部會由於抵靠在阻擋部的周緣上而不能繼續偏轉，並形 成—個扁錐面，而片狀部在背離阻擋部的方向上則可以/ 由偏轉。 以自 ，根據本公開的-次性注射器通過使在注射時支標件的 又力位置接近或重合，從而使其受力達到平衡進而保持 了針座和針頭在注射時的穩定；而在回拉怒杆時，則通過 使受力位置錯開產生力矩，使得如同杠杆一樣，只需报小 的力就可使支樓件與針筒脫開。而將支撐件設置為向針座 凸起的球面、弧面或傘形面一方面可以提高支撐件對針座 的支樓力，另一方面借助球面、弧面或伞形面翻轉時產生 的力’使支標件與針筒更容易脫開。此外，圓形支樓件和 %形凹槽的配合方式無需在周向上使兩者對準從而使裝 配更為簡單。 义 以下將結合附圖對本發明的構思、具體結構及產生的 技術效果作進—步說明，以充分地瞭解本發明的目的、特 徵和效果。 【實施方式】 據本發明的一個較佳實施例如圖1所示，圖中1為 針座、2為針筒、3為支撐件、4為芯杆的杆頭。 支撐件3可以有多種具體的實施方式，如圓片狀、花 瓣狀條狀或輕射狀等，從而相應地具有周緣或端部31。 支樓件3 —般由與一次性注射器相同材質的塑膠製成。支 身牙件3的周緣或端部31位於設在針筒2内側的與之相對應 201249494 的環形凹槽或相互獨立的凹座2”。針座！通過密封圈5 =封地配合在針筒2中，且在圖4上方受到針筒2的約 。方X到支撐件3的支撐’從而被保持在針筒2和支 撐件3之間。針座！被配置為僅在位於或鄰近支撐件3的 周緣或端部31處與支撐件3接觸。例如圖！中所示，將針 座1的底面U設置為如漏斗般自其最外緣向針座】的中心 ^孔12逐漸凹進。這樣支#件3對針座1的受力位置與針 清2上的環形凹槽或凹㈣對支撐件3的受力位置十分接 和甚至是近乎重合的，於是針頭（未示出）在注射時受 到的屋力經由針座！被直接傳遞至針筒2，從而使支撐件 3和針座1在注射過程中均能保持很好的穩定性。 牛八有中〜通孔35，芯杆的杆頭4上設置有回 拉部4卜當注射時，推動芯杆，杆頭4上的回拉部μ可擠 =心通孔35 ’然而在回拉怒杆時，回拉料則會被堵在 通孔35的孔口處，向支撑件3施加回拉的力。此時支 樓件3在其周緣或端部31受到環形凹槽或凹座_向上的 支撐力’而在其中央部位則受到回拉部以的向下的 於受力位置間存在㈣，且受力时^同，因此作用在 支樓件3的受力形成了力矩，在力矩的作用下，支禮们 發生變形，自其中 、中央邛位開始向下運動，同時帶動其周緣 或端部31㈣形凹槽或凹座⑽離，並且由於該力矩的存 在如同槓杯—樣，只需很小的力即可完成上述的支撐件 3的整個脫離過程。 ^叉保件 通過上述的支撐件3的設置，解決了在注射時要求針 201249494 座1保持足夠穩定，而在注射完畢後，又能很輕鬆地將針 座1拉回針筒2的矛盾。 進Y地，支撐件3可以被設置為是向針座J凸起的 ’如圖2所示’支樓件3的面32被設置為球面或弧面。這 樣-方面與换橋的原理相似，這種球面或弧面的設置使得 在注射時支撐件3對針座1的支禮作用更為穩定；而另一 方面還可將針座i的底面u設置為比支撐件3的曲率更小 的球面或弧面，使得底面11和支樓件3的面32在受壓時可 在周緣處可通過變形而形成面接觸，從而增強支撐作用。 而在回拉時，由於球面或弧面的翻轉作用使得支撐件3的 周緣或端部31更易與環形凹槽或凹座釘脫離。另外向上凸 起的球面或弧面的設置也使得將支樓件3裝配至環形凹槽 21的過程阻力更小且由於無需在周向上使兩者對準，從而 使裝配更為簡單。 片進一步地，如圖3所示，支撐件3可以被設置為是不 等厚的如在其上设置凹部33，或者使不同的部位具有不 同的特丨生，如在其上設置連接部34，連接部與支撐件3 的其他部位相比，可以具有更好的彈性或者柔性，使得支 標件3更容易翻轉。 支撐件3還可以被設置為是如圖5所示的更容易加工 的傘形36同樣也可在其上設置上述的凹部％和/或連接 部34 ’以使其更易於翻轉。 如圖1所示的實施例中，針座1的中心通孔12内側設 置有肩狀部13，杆頭4相應地設置有另一回拉部42，回拉 8 201249494 部42和回拉部41間隔一段距離。在注射時，回拉部“擠過 中心通孔12内側的肩狀部13，回拉部41擠過中心通孔％ ; 在注射完畢回拉時’回拉部41先將支撐片3自環形凹槽或 凹座21中拉出，此時針座1已失去了支禮片3對其的限位 和支撐作用，隨後回拉部42與肩狀部13接合，進一步地將 針座1拉入針筒2内。 其中回拉部41、42可以有多種實施方式，包括常見的 錐形台，杆頭4上推時錐形台通過其錐面擠過中心通孔％ 或肩狀部13，而回拉時，錐形台的底面則與中心通孔％或 肩狀部13接合，從而對支撐件3或針座i施加向下的拉力 〇 回拉部4卜42也可以為如圖！、6中的結構6，該結 構6在杆頭4的長度方向上依次包括三部分：片狀部61、 頸狀部62、阻擋部63，其中片狀部61的直徑大於阻擋部63 的直徑，頸狀部62的直徑小於片狀部61和阻擋部纪的直徑 ，且其長度被設置為當片狀部61向阻擋部63彎曲變形時可 抵觸到阻擋部63的周緣。片狀部61的直徑大於中心通孔％ 和肩狀部13的内徑，而阻擋部63小於中心通孔”和肩狀部 13的内徑。當杆頭4上推時，片狀部61向下偏轉從而使得 結構6可通過中心通孔35和肩狀部13 ;而當杆頭4回拉時 ，片狀部61向阻擋部63的偏轉因為抵觸到阻擋部63的周緣 而受限，不能繼續偏轉並由此形成了 一個類似很淺的碟狀 的扁錐面，於是片狀部61抵靠在阻擋部63的周緣和中心通 孔35或肩狀部13之間，從而對支撐件3或針座丨施加向下 201249494 的拉力。 以上詳細描述了本發明的較佳具體實施例。應當理解 ，本領域的普通技術無需創造性勞動就可以根據本發明的 構思作出諸多修改和變化。因此，凡本技術領域中技術人 員依本發明的構思在現有技術的基礎上通過邏輯分析、推 理或者有限的實驗可以得到的技術方案，皆應在由申請專 利範圍所確定的保護範圍内。 【圖式簡單說明】 圖1 意圓； 是本發明的一次性注射器的 一個實施例的部分示 圖2 圖3 圖4 圖5 圖6 疋本發明的支樓件一彳 芽1干個貫施例的示意圖 是本發明的支撐件另 是本發明的支樓件另 是本發明的支撐件另 是本發明的回拉部的 個實施例的示意圖 個實施例的示意圖 個實施例的示意圖 個實施例的示意圖 及 10 201249494 【主要元件符號說明】 1 針座 35 中心通孔 11 底面 36 傘形 12 中心通孔 4 杆頭 13 肩狀部 41 回拉部 2 針筒 42 回拉部 21 凹座/環形凹槽 5 密封圈 3 支撐件/支撐片 6 結構 31 端部/周緣 61 片狀部 32 面 62 頸狀部 33 凹部 63 阻擋部 34 連接部 11201249494 VI. Description of the Invention: [Technical Field] The present invention relates to a disposable syringe', particularly to a disposable syringe that can be used to pull the needle back into the barrel after use. [Prior Art] In order to avoid cross-dyeing when inputting or removing media to humans or animals, the hypodermic 4 Φ device must be used once and used as & garbage disposal. The most widely used disposable syringes are composed of a hollow cylinder and a fixed-range piston assembled in the cylinder. The biggest problem with this kind of syringe is that after the injection is completed, the needle is still left outside, which not only causes inconvenience to the handling and destruction of the syringe garbage, but also may injure the medical staff due to carelessness, resulting in secondary treatment of the bacteria. Infection, it becomes a medical hazard that cannot be ignored, so there is a disposable syringe with a needle retractable. "Chinese Patent (10) discloses "a safe syringe for use", including a syringe and a hub, wherein the syringe and the hub pass through an annular boss disposed outside the hub and an annular groove disposed inside the syringe Interconnected, the drawback of this structure is that when the needle holder is manually pulled back, the annular boss and the annular groove are separated from each other. The resistance to be overcome is very large. It is very laborious and difficult to operate, and the assembly is difficult. Excessive force causes the annular boss to directly pass over the annular groove, causing assembly failure. PCT Patent Application pCT/CN2(10) Touch 52〇 discloses "the tip of the needle can be retracted by the human spit queen; the main shot g" through the needle seat and the syringe The stop element boss structure and the self-destructing ruler position the needle holder relative to the syringe. The support leg of the self-destructing bar is connected in the recess on the inner side of the barrel. During the retraction of the needle seat, the destructive bar is deformed and disconnected from the recess from 201249494, thereby allowing the needle seat to retract into the syringe. . Such a structure still has some drawbacks, such as the need to align and insert the support legs of the self-destructing bar with the recesses on the syringe, which increases the difficulty of assembly. When the injection is self-destructing, the support force of the needle holder is insufficient, so that the needle is not stable enough during the injection, and the process of retracting the needle still needs to overcome the resistance caused by the stop of the stop element. During the injection process, the needle will be subjected to the reaction force of the body of the injected person to generate pressure on the needle seat into the syringe. At this time, the needle seat is required to receive enough branches to maintain the stability. In contrast, after the injection is completed, the needle is pulled back. When the needle is used, it is desirable that the needle retraction process be subjected to as little resistance as possible. Accordingly, those skilled in the art are directed to developing a disposable syringe that is easy to assemble, has a stable needle and needle holder at the time of injection, and has low resistance when pulled back after injection. SUMMARY OF THE INVENTION In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a needle holder for the injection, and after the injection, the needle holder and the needle are easily pulled back. A disposable injection of the syringe. To achieve the above object, the present invention provides a secondary syringe comprising a needle holder, a syringe and a core rod, and a support member having a center and a through hole, the support member being coupled to the (four) of the syringe, the needle holder being Keeping the syringe and the slab member = between the 'the force of the support at the first force-receiving position being subjected to the force from the needle seat 4' at the second force-receiving position is subjected to the upward force force position from the syringe and The second force-receiving position is located at or near the circumference of the support or 4 201249494. When the injection is pulled back, the support is at the third force-receiving position: the door, the flute = the downward force' makes the branch and the syringe The connection between the two party forces is located in the center of the support. In a preferred embodiment of the second::, the branch member is circular, petal, strip or radial. . In another preferred embodiment of the present invention, the support member is a circular sheet member having a spherical surface or arc that is convex toward the needle holder support member in another preferred embodiment of the present invention. surface. In another preferred embodiment of the invention, a raised umbrella surface. The support member has at least one support member which is at least partially thinner than the other portions in another preferred embodiment of the invention. In another preferred embodiment of the present invention, the portion has greater elasticity or flexibility than the other portions. In another preferred embodiment of the present invention, the bottom end surface of the holder is from the outermost edge of j: The center through hole of the needle holder is gradually recessed. - In a further preferred embodiment of the invention Λβ i* 4* -η. ^ 周 The circumference or end 4 of the support is connected in an annular groove or recess provided inside the barrel. In the ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Μ. The diameter of the shape is greater than the deflection of the ... ... ... ... 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 The spacing distance between the blocking portions 201249494 is set such that when the sheet portion is deflected toward the blocking portion, the portion may not continue to deflect due to abutting against the circumference of the blocking portion, and form a flat tapered surface, and the sheet portion It can be deflected in the direction away from the blocking portion. The secondary syringe according to the present disclosure maintains the stability of the needle holder and the needle at the time of injection by bringing the force position of the rod member close to or coincident at the time of injection, thereby maintaining the stability of the needle holder and the needle at the time of injection; When the anger lever is pulled, the torque is generated by staggering the force position, so that, like the lever, the branch member and the syringe can be disengaged only by reporting a small force. The spherical surface, the curved surface or the umbrella surface which is arranged to protrude the support member on the one hand can improve the supporting force of the supporting member on the needle seat, and on the other hand, when the spherical surface, the curved surface or the umbrella surface is inverted Force ' makes the support and the syringe easier to disengage. In addition, the manner in which the circular branch member and the %-shaped recess are fitted does not require the two to be aligned in the circumferential direction to make assembly easier. The concept, the specific structure and the technical effects of the present invention will be further described in conjunction with the accompanying drawings in order to fully understand the objects, features and advantages of the invention. [Embodiment] A preferred embodiment of the present invention is shown in Fig. 1. In the drawings, 1 is a needle holder, 2 is a syringe, 3 is a support member, and 4 is a core rod. The support member 3 can have a variety of specific embodiments, such as a disk shape, a flower-like strip shape or a light-like shape, etc., thereby correspondingly having a peripheral edge or end portion 31. The branch member 3 is generally made of plastic of the same material as the disposable syringe. The circumference or end 31 of the dental piece 3 is located in the annular groove or the independent recess 2" corresponding to the 201249494 provided inside the barrel 2. The needle seat is fitted to the syringe through the sealing ring 5 = sealing ground 2, and above the cylinder 2 is received about the side of the barrel 2. The support of the square X to the support 3 is thus held between the barrel 2 and the support 3. The hub! is configured to be located only or adjacent to the support The periphery or end portion 31 of the piece 3 is in contact with the support member 3. As shown in Fig.!, the bottom surface U of the needle holder 1 is set to gradually recess from the outermost edge of the needle holder 1 toward the center hole 12 of the needle seat. In this way, the force position of the pair of needles 3 and the needle groove 1 and the annular groove or the recess (4) of the needle clear 2 are very close and even coincident with the force receiving position of the support member 3, so the needle (not shown) The house force received at the time of injection is directly transmitted to the syringe 2 via the needle holder 2, so that the support member 3 and the needle holder 1 can maintain good stability during the injection process. The head 4 of the core rod is provided with a pull-back portion 4. When the injection is made, the core rod is pushed, and the pull-back portion μ on the head 4 can be squeezed = the core through hole 35 When the anger lever is pulled back, the back pull material is blocked at the opening of the through hole 35, and a pulling force is applied to the support member 3. At this time, the branch member 3 is subjected to an annular recess at its periphery or end portion 31. The support force of the groove or the recess_upward is present at the central portion thereof by the pull-down portion (4), and the force is applied to the force, so that the force acting on the branch member 3 is exerted. The moment is formed. Under the action of the moment, the rituals are deformed, and the central squat is started to move downward, and at the same time, the peripheral or end 31 (four) shaped groove or recess (10) is driven away, and due to the existence of the moment Like the bar cup, the entire detachment process of the above-mentioned support member 3 can be completed with a small force. ^The fork retaining member is solved by the above-mentioned support member 3, which solves the requirement that the needle 201249494 seat 1 remains sufficient at the time of injection. Stable, and after the injection is completed, the contradiction of pulling the needle holder 1 back to the syringe 2 can be easily achieved. In the Y ground, the support member 3 can be set to be convex toward the needle holder J as shown in FIG. 'The face 32 of the branch member 3 is set to be spherical or curved. This is similar to the principle of the bridge change. Such a spherical or curved surface arrangement makes the support of the support member 3 more stable to the needle holder 1 at the time of injection; on the other hand, the bottom surface u of the needle holder i can be set to be smaller than the curvature of the support member 3. The spherical surface or the curved surface, so that the bottom surface 11 and the surface 32 of the branch member 3 can be deformed to form a surface contact at the peripheral edge when pressed, thereby enhancing the supporting effect. In the case of pulling back, due to the spherical or curved surface The flipping action makes it easier for the circumference or end 31 of the support member 3 to be disengaged from the annular groove or the recessed nail. The arrangement of the upwardly convex spherical or curved surface also causes the process resistance of assembling the branch member 3 to the annular groove 21. It is smaller and makes assembly easier because there is no need to align the two in the circumferential direction. Further, as shown in Fig. 3, the support member 3 can be arranged to be unequal in thickness as if the recess 33 is provided thereon. Or to make different parts have different characteristics, such as providing a connecting portion 34 thereon, the connecting portion can have better elasticity or flexibility than other parts of the supporting member 3, making the standard member 3 easier Flip. The support member 3 can also be provided as an umbrella shape 36 which is easier to process as shown in Fig. 5, and the above-described recessed portion % and/or the connecting portion 34' can also be provided thereon to make it easier to flip. In the embodiment shown in FIG. 1, the inner side of the central through hole 12 of the hub 1 is provided with a shoulder portion 13, and the head 4 is correspondingly provided with another pull-back portion 42, which is pulled back 8 201249494 portion 42 and the pull-back portion 41 is separated by a distance. At the time of injection, the pull-back portion "squeezes the shoulder portion 13 inside the center through hole 12, and the pull-back portion 41 is pushed over the center through hole %; when the injection is completed, the pull-back portion 41 firstly supports the support piece 3 from the ring. The groove or recess 21 is pulled out, at which time the needle holder 1 has lost its limit and support for the blade 3, and then the pullback portion 42 is engaged with the shoulder portion 13, further pulling the needle holder 1 into There are various embodiments of the pull-back portions 41, 42 including a common conical table. When the head 4 is pushed up, the conical table is pushed through the central through hole % or the shoulder portion 13 through its tapered surface. When pulling back, the bottom surface of the conical table is engaged with the central through hole % or the shoulder portion 13 to apply a downward pulling force to the support member 3 or the needle holder i. The returning portion 4 can also be as shown in the figure! The structure 6 of 6, the structure 6 includes three parts in sequence in the longitudinal direction of the head 4: a sheet portion 61, a neck portion 62, and a blocking portion 63, wherein the diameter of the sheet portion 61 is larger than the diameter of the blocking portion 63 The diameter of the neck portion 62 is smaller than the diameter of the sheet portion 61 and the blocking portion, and the length thereof is set to be abuttable when the sheet portion 61 is bent and deformed toward the blocking portion 63. The circumference of the blocking portion 63 is touched. The diameter of the sheet portion 61 is larger than the center through hole % and the inner diameter of the shoulder portion 13, and the blocking portion 63 is smaller than the center through hole" and the inner diameter of the shoulder portion 13. When the head 4 is pushed up, the sheet portion 61 is deflected downward so that the structure 6 can pass through the center through hole 35 and the shoulder portion 13; and when the head portion 4 is pulled back, the sheet portion 61 is deflected toward the blocking portion 63 Since it is restricted against the circumference of the blocking portion 63, the deflection cannot be continued and a flattened disk-like flat tapered surface is thus formed, so that the sheet portion 61 abuts against the periphery of the blocking portion 63 and the center through hole 35. Or between the shoulders 13, thereby applying a downward pulling force of 201249494 to the support member 3 or the needle seat. The above has described in detail the preferred embodiments of the invention. It will be appreciated that many modifications and variations can be made in the present invention without departing from the scope of the invention. Therefore, any technical solution that can be obtained by a person skilled in the art according to the prior art based on the prior art by logic analysis, reasoning or limited experimentation should be within the scope of protection determined by the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of an embodiment of a disposable syringe of the present invention. Fig. 2 Fig. 2 Fig. 4 Fig. 5 Fig. 6 A branch of the present invention BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram of the present invention is a support member of the present invention, and is a support member of the present invention, and is a support member of the present invention, and is a schematic diagram of a schematic embodiment of an embodiment of the pull-back portion of the present invention. Schematic diagram of the example and 10 201249494 [Description of main components] 1 Needle seat 35 Center through hole 11 Bottom surface 36 Umbrella 12 Center through hole 4 Head 13 Shoulder 41 Pull back 2 Syringe 42 Pull back 21 Recess / Annular groove 5 Sealing ring 3 Support/support sheet 6 Structure 31 End/perimeter 61 Sheet portion 32 Face 62 Neck portion 33 Recess 63 Block portion 34 Connection portion 11