200810802 (1) 九、發明說明 • 【發明所屬之技術領域】 本發明關於用於導管和引入針組件的引入針，該引入 針上設有凹槽。 【先前技術】 血管內導管，特別是靜脈導管，通常被用於給病人輸 入液體’比如通常的鹽液、各種藥物以及注射營養品等， 或者用來從病人體內抽取血液。末梢靜脈導管通常比較短 ’尺寸大槪在兩英寸或更短。最常見類型的導管是套在一 個引入針上的末梢靜脈導管。這種套在引入針上的末梢靜 脈導管是裝配在一根帶有尖銳針尖的引入針上。導管和引 入針被組裝成，引入針的針尖延伸超過導管的針尖，並且 引入針針尖部的傾斜面朝上。 導管和引入針組件被以一個淺的角度刺穿病人的皮膚 而進入到末梢血管中，所述的末梢血管不與心臟直接相連 ’而是與心臟直接相連的中央血管分支之一相連。在其中 一種技術中，引入針和導管一起被完全刺入到血管中。而 在另外一種技術中，引入針在開始的靜脈穿刺之後被部分 地從導管抽出。然後，導管被完全插入到血管中。 _ 在導管和引入針組件插入到血管中之後，比較重要的 是需要確I忍該組件是否在血管中處於正確的定位。因此， 醫務人員需要確認是否在引入針中有回流血存在。爲了確 認所述組件是否正確定位，引入針可以在其遠端部分上設 -4 - 200810802 (2) 有一個凹槽或開口，這樣，當導管由透明或半透明材料製 - 成時，可以在引入針和導管之間的環形空間中觀察血液回 流。一旦正確的定位得以確認，醫務人員將通過在引入針 和導管組件的尖端部位向下壓患者的皮膚而對血管施加壓 力。手指的壓力將閉塞進一步的血液流動通過引入針。醫 務人員抽出引入針而將導管留在原地，然後將液體輸送裝 置比如普通肝素帽或者將頭蓋連接到導管。一旦引入針從 導管中抽出，其將會帶有“沾染血液的針尖”，必須要正確 處置。 近年來，對於醫務人員可能沾染到患者的血液已經有 了非常大的關注，已經認識到“沾染血液的針尖”必須要立 即處置。這種關注越來越大，因爲出現了目前還不能治療 的致命疾病，比如，愛滋病（AIDS )，這些疾病可能通 過體液的交換而從一個被感染者傳遞到另外一個人。因此 ’與愛滋病感染者的體液接觸必須要避免。正如上面所述 的那樣’如果引入針已經被用於將一個導管放置到愛滋病 感染者的血管中，那麼這個引入針就是傳遞疾病的一個媒 介。儘管醫務人員已經知道需要正確處理“沾染血液的針 尖” ’但是不幸的是在某些醫療環境下，比如緊急情況下 或者由於沒留意或疏忽，依然存在著被沾染的引入針戳到 , 醫務人員的情形。 、 爲了解決上述被“血液沾染的針尖，，意外刺到的問題， 已經開發了各種安全的導管和引入針組件。這些導管和引 入針組件設有彈簧夾或者針罩，這些彈簧夾或者針罩在引 -5- 200810802 (3) 入針抽出之後會握持在引入針的針尖部上，從而防止醫務 . 人員接觸到針尖。 已有的帶有回流凹槽的引入針上設有一個鐵環’該鐵 環比所述回流凹槽更加靠近針尖。當引入針從導管中抽出 時，該鐵環將會阻擋針尖移出所述彈簧夾或針罩之外。以 這種方式，針尖將會被保護在彈簧夾或針罩中。 US 52 1 5 5 2 8就開公開這種安全導管和引入針組件的文獻之 -- 〇 然而，已有的帶有回流凹槽以及鐵環的引入針製造起 來相對比較昂貴，因爲需要單獨的步驟來將所述鐵環安裝 到所述引入針上。除了成本上的缺點之外，還有另外兩個 問題。一個潛在的問題就是在引入針往引入針針座上黏接 的工藝過程中，需要黏接劑將引入針黏接到引入針針座上 ，而黏接劑可能會堵塞所述回流凹槽或者針尖開口。另外 一個潛在的問題是所述鐵環不可避免地會減少導管內腔和 引入針之間的環形空間大小，而這種減小又不良地使得回 流凹槽中觀察到的血液回流變慢，甚至根本沒有回流。 本發明正是涉及到帶有回流凹槽的引入針的改進，這 種引入針例如可以用在導管和引入針組件，尤其是安全靜 脈導管和引入針組件中。 【發明內容】 本發明提供了一種用於導管和引入針組件的引入針， 該引入針上設置有凹槽和擠壓凸起。 -6 - 200810802 (4) 優選地，所述凹槽比所述擠壓凸起更加靠近引入針的 針尖。 所述擠壓凸起通過在Y軸線上擠壓所述引入針而形 成，從而使引入針的材料在Χ軸線上流動形成該擠壓凸 起，所述引入針的內腔通過所述擠壓而變扁。 在其中一個實施例中，所述擠壓凸起的橫截面爲啞鈴 形狀。 所述啞鈴形凸起通過在所述引入針的兩點處擠壓或夾 該引入針而形成，所述兩點的連線與所述引入針的軸線交 叉。 在另外一個實施例中，所述擠壓凸起的橫截面爲橢圓 形狀。 所述橢圓形的擠壓凸起由兩個平表面擠壓所述引入針 而形成。 在下文中將參照附圖中示出的最佳實施例對本發明進 行詳細的描述說明。 【實施方式】 在本文中，術語“近端”和“遠端”用於描述引入針上的 位置，它們是在引入針的針尖離使用導管和引入針組件的 醫務人員最遠這種狀態下相對於醫務人員而說的。 圖1示意地示出了帶有根據本發明實施例的引入針的 導管和引入針組件的一部分。在圖1中導管和引入針組件 已經插入到患者的血管中。如圖1所示，導管2套在引入 200810802 (5) 針1的外部。導管由透明或至少半透明材料製成。引入針 1具有用於觀察血液回流的凹槽3和擠壓凸起4，在實施 例中，凹槽3比擠壓凸起更加靠近引入針的針尖。在使用 時，當導管和引入針組件被插入血管中之後，醫務人員必 須要確認該組件是否在血管中正確定位，即，醫務人員確 認是否在引入針中有血液的回流發生。在圖1中由標號5 所示的箭頭示出了血液在引入針中回流。由於導管是透明 或者至少是半透明的，所以在引入針和導管內腔之間的環 形空間中可以觀察到血液回流。一旦導管的正確定位得以 確認，醫務人員就通過在導管的遠端部位處壓下患者的皮 膚而對患者的血管施加壓力。這種手指的壓力將阻塞通過 引入針的進一步血液回流。然後，醫務人員抽出引入針， 而將導管留在那裏。上述阻塞也可以通過其它的裝置或者 手段實現，比如說，在導管和引入針組件中設置隔離塞（ septum) 〇 圖2a-2d示出本發明引入針的擠壓凸起4是如何製成 的。圖2 a示出了引入針1的頂視圖，凹槽3的開口位於 引入針1的頂部。圖2b爲引入針！的側視圖。圖2c爲本 發明其中一個實施例的擠壓凸起4沿著圖2b中的剖線A-A剖開的剖視圖。圖2 d爲本發明另外一個實施例的擠壓 凸起4沿著圖2b中的剖線A-A剖開的剖視圖。 爲了方便描述，建立一個坐標系是必要的。參照圖 2 a，X軸線沿著從紙頁的底部到頂部的方向，而γ軸線垂 直於紙頁的方向。 -8 - 200810802 ⑹ 如圖2c-2d所示，本發明的引入針i在γ軸線上受到 ^ 擠壓，受到擠壓的材料在X軸線方向上流動，從而在X 軸線方向上獲得擠壓形成的凸起。引入針1的內腔9由於 該擠壓作用變扁。 圖2 d不出本發明的其中一個實施例，在該實施例中 ，擠壓形成的凸起4通過在兩點處擠壓或者夾引入針1而 形成。所述兩個點相連形成的軸線必須與引入針1的縱向 軸線交叉。由於擠壓或夾的作用，引入針的圓柱體就獲得 一種維度上的變化，也就是說，引入針的圓柱體經過擠壓 而壓縮形成一個啞鈴型凸起，並且這種維度上的改變是對 稱的。這樣做了之後，引入針的內腔9就變扁，同時受到 壓縮的材料往兩側流動，由於質量守恆而形成啞鈴形。 如圖2 c所示，在本發明的另外一個實施例中，可以 通過兩個平面而不是上述的兩點對引入針進行擠壓而形成 橫截面形狀爲橢圓形狀的擠壓凸起。 優選地，用於觀察血液回流的凹槽3比擠壓凸起4更 靠近引入針的針尖。這樣，擠壓凸起4將具有兩個功能。 一個功能是作爲止擋裝置來防止引入針的針尖移出彈簧夾 或針罩（未示出）之外。另外一個功能是在使用黏接劑將 引入針與引入針針座6黏接起來時，擠壓凸起4變扁的內 腔能防止黏接劑流入到引入針的凹槽3中將其堵塞，這將 會在下文中參照附圖3進一步描述。 値得一提的是，導管2的內腔與引入針1的外表面之 間的環形空間應該足以使回流血快速流動，而不應當由於 -9 - 200810802 (7) • 擠壓凸起4的存在而損害到這種流動。 . 本發明的帶有用於血液回流的凹槽3和擠壓凸起4的 引入針1與現有技術中的引入針相比具有幾個優點。 在現有技術的帶有回流凹槽的引入針中，採用鐵環作 爲止擋裝置，該鐵環必須要比所述回流凹槽更加靠近引入 針的針尖。否則，如果回流凹槽比所述鐵環靠近針尖，那 麼該鐵環由於具有圓型橫截面，將會堵塞位於引入針和導 管內腔之間的血液回流路徑，從而導致不能發生血液回流 〇 另外，如圖3所述，在引入針1和引入針針座6的組 裝過程中，需要沿著箭頭7所示位置分配黏接劑來將它們 黏接在一起。因此，爲了防止黏接劑從箭頭8所示的方向 流入到引入針的內腔並且阻塞回流凹槽3，在現有技術的 工藝中必須要有一個擠壓引入針的近端的步驟，這樣將會 防止黏接劑流入到引入針的內腔中。 然而，在本發明實施例的引入針1中，優選地是，將 凹槽3的位置設置成比擠壓凸起4更加靠近針尖。這樣， 由於擠壓凸起4具有壓扁的橫截面積，所以其不會阻塞位 於引入針和導管之間的血液回流通路。如圖1所示，本發 明的這種引入針結構將優化血液回流，使其順暢地從凹槽 3流向近端，其間流過擠壓凸起4。 最後但並不是最不重要，如圖3所示，在引入針1和 引入針針座6的組裝過程中，需要分配黏接劑來黏接引入 針1和引入針針座6。因此’就存在潛在的危險使黏接劑 -10- (8) (8)200810802 流入到引入針1的內腔中，從而不良地堵塞凹槽3，從而 也就堵塞了血液的回流。如上文已經描述過的，在現有技 術中’需要一個額外的步驟來解決黏接劑流入到引入針1 的內腔這個問題。然而，在本發明中，這個額外的步驟不 需要’因爲擠壓凸起4的壓扁內腔將會限制黏接劑流動到 凹槽3而將其堵塞。因此，本發明的擠壓凸起4將具有兩 個功能。一個功能是起到了現有技術中鐵環止擋裝置的作 用，其防止了引入針1移出彈簧夾或針罩之外，另外一個 功能就是黏接劑阻擋物的作用，其起到了現有技術中經擠 壓的近端的作用。因此，本發明的擠壓凸起4相對於現有 技術中的鐵環結構成本更加便宜。 値得一提的是’儘管凹槽3和擠壓凸起4的位置可以 顛倒，即，擠壓凸起4比凹槽3更加靠近針尖。但是，這 種情況下，回流血在從凹槽3流出之前將會一定程度地受 到引入針1在擠壓凸起4處變扁和減小的內腔的限制。而 且’在這種情況下，在引入針1和引入針針座6的組裝過 程中，還是如現有技術中那樣，需要將引入針的近端壓扁 而防止黏接劑流入到引入針的內腔並阻塞凹槽3。 在上文中是以舉例的方式參照具體實施例對本發明進 行描述，然而，不應當理解爲是對本發明的限制，本領域 技術人員可以在不脫離本發明保護範圍的情況下對這些實 施例進行改變。本發明的保護範圍由權利要求書限定。 【圖式簡單說明】 -11 - 200810802 (9) * 圖1示意地示出了本發明引入針的擠壓形成的凸起和 . 血液回流凹槽的佈置結構； 圖2 a-2d示意地示出了本發明的引入針是如何被擠壓 形成所述凸起的； 圖3示出了黏接劑流入到引入針針座和引入針中。 【主要元件符號說明】 1 :引入針 2 :導管 3 :凹槽 4 :擠壓凸起 6 :引入針針座 9 :內腔 -12-200810802 (1) EMBODIMENT OF THE INVENTION 1. Field of the Invention The present invention relates to an introduction needle for a catheter and an introduction needle assembly, the introduction needle being provided with a groove. [Prior Art] Intravascular catheters, particularly venous catheters, are commonly used to deliver fluids to patients such as normal saline, various drugs, and injectable nutrients, or to extract blood from a patient. The peripheral venous catheter is usually shorter than the size of a large 槪 in two inches or less. The most common type of catheter is a peripheral venous catheter that is placed over an introducer needle. The distal venous catheter that is placed over the introducer needle is mounted on an introducer needle with a sharp needle tip. The catheter and the introducer needle are assembled such that the tip of the introducer needle extends beyond the tip of the catheter and the angle of the tip of the introducer needle is directed upward. The catheter and introducer needle assembly are pierced into the peripheral blood vessel at a shallow angle to the peripheral blood vessel, which is not directly connected to the heart' but is connected to one of the central vessel branches directly connected to the heart. In one technique, the introducer needle and catheter are fully inserted into the blood vessel. In yet another technique, the introducer needle is partially withdrawn from the catheter after the initial venipuncture. The catheter is then fully inserted into the blood vessel. _ After the catheter and introducer needle assembly are inserted into the blood vessel, it is important to ensure that the component is properly positioned in the blood vessel. Therefore, the medical staff needs to confirm whether there is reflux blood in the introduction needle. In order to confirm that the assembly is correctly positioned, the introduction needle can be provided on its distal end portion - 4 - 200810802 (2) with a groove or opening so that when the catheter is made of transparent or translucent material, Blood flow was observed in the annular space between the introducer needle and the catheter. Once the correct positioning is confirmed, the medical staff will apply pressure to the blood vessel by pressing down the patient's skin at the tip of the introducer needle and catheter assembly. The pressure of the finger will occlude further blood flow through the introducer needle. The medical staff pulls the introducer needle to leave the catheter in place and then attaches the fluid delivery device, such as a plain heparin cap, or attaches the cap to the catheter. Once the introducer needle is withdrawn from the catheter, it will carry a “blood tip that is contaminated with blood” and must be disposed of properly. In recent years, there has been a great deal of concern for medical personnel who may be contaminated with the patient's blood. It has been recognized that "the tip of the bloodstream" must be disposed of immediately. This concern is growing because of the emergence of deadly diseases that are currently not treatable, such as AIDS, which can be passed from one infected person to another through the exchange of body fluids. Therefore, contact with body fluids of people living with AIDS must be avoided. As described above, if the introducer needle has been used to place a catheter into the blood vessels of an AIDS-infected person, the introducer needle is a medium for transmitting the disease. Although medical staff already know that it is necessary to properly handle the “tip of the blood-stained tip”, it is unfortunate that in some medical settings, such as in an emergency or because of inadvertent or negligent, there is still a contaminated lead-in poke, medical staff. The situation. In order to solve the above-mentioned problems caused by "blood-stained needle tips", various safety catheters and introducer needle assemblies have been developed. These catheter and introducer needle assemblies are provided with spring clips or needle shields, and these spring clips or needle shields After the needle is pulled out, it will be held on the needle tip of the introduction needle to prevent medical personnel from touching the needle tip. The existing introduction needle with the return groove has a hoop. 'The iron ring is closer to the needle tip than the return groove. When the introduction needle is withdrawn from the catheter, the iron ring will block the needle tip from moving out of the spring clip or needle cover. In this way, the needle tip will be protected In the case of a spring clip or a needle cover, US 52 1 5 5 2 8 discloses the publication of such a safety catheter and the introduction of a needle assembly - however, existing introduction needles with a recirculation groove and an iron ring are manufactured. It is relatively expensive because a separate step is required to mount the iron ring to the introduction needle. In addition to the cost disadvantages, there are two other problems. A potential problem is the introduction of the needle. During the bonding process on the needle holder, an adhesive is required to adhere the introduction needle to the introduction needle holder, and the adhesive may block the return groove or the needle tip opening. Another potential problem is The iron ring inevitably reduces the size of the annular space between the lumen of the catheter and the introduction needle, which in turn makes the blood flow observed in the return groove slower or even no reflux at all. It is an improvement involving an introducer needle with a recirculating groove which can be used, for example, in a catheter and an introducer needle assembly, in particular a safe intravenous catheter and an introducer needle assembly. SUMMARY OF THE INVENTION The present invention provides a a catheter and an introduction needle of the introduction needle assembly, the introduction needle being provided with a groove and a pressing protrusion. -6 - 200810802 (4) Preferably, the groove is closer to the needle tip of the introduction needle than the extrusion protrusion The pressing protrusion is formed by pressing the introduction needle on the Y axis, so that the material of the introduction needle flows on the crucible axis to form the pressing protrusion, and the inner cavity of the introduction needle passes the extrusion Pressure In one embodiment, the cross section of the pressing protrusion is a dumbbell shape. The dumbbell shaped protrusion is formed by pressing or clamping the introduction needle at two points of the introduction needle. The line connecting the two points intersects the axis of the introduction needle. In another embodiment, the extrusion protrusion has an elliptical cross section. The elliptical extrusion protrusion is squeezed by two flat surfaces. The invention is described in detail with reference to the preferred embodiments illustrated in the drawings. [Embodiment] As used herein, the terms "proximal" and "distal" are used herein. Describe the position on the introducer needle, which is said relative to the medical staff in the state where the needle tip of the introducer needle is furthest from the medical staff using the catheter and the introducer needle assembly. Figure 1 is a schematic representation of a device according to the invention The catheter of the introducer needle of the embodiment and a portion of the introducer needle assembly. In Figure 1 the catheter and introducer needle assembly has been inserted into the patient's blood vessel. As shown in Figure 1, the catheter 2 is placed outside the introduction of the 200810802 (5) needle 1. The catheter is made of a transparent or at least translucent material. The introduction needle 1 has a groove 3 for observing blood return and a pressing projection 4, and in the embodiment, the groove 3 is closer to the needle tip of the introduction needle than the pressing projection. In use, after the catheter and introducer needle assembly are inserted into the blood vessel, the medical professional must confirm that the component is properly positioned in the blood vessel, i.e., the medical personnel confirms that there is blood backflow in the introducer needle. The arrow indicated by reference numeral 5 in Fig. 1 shows the blood flowing back in the introduction needle. Since the catheter is transparent or at least translucent, blood reflux can be observed in the annular space between the introducer needle and the lumen of the catheter. Once the correct positioning of the catheter is confirmed, the medical staff applies pressure to the patient's blood vessel by depressing the patient's skin at the distal end of the catheter. This finger pressure will block further blood backflow through the introducer needle. The medical staff then pulls out the introducer while leaving the catheter there. The above obstruction can also be achieved by other means or means, for example, providing a septum in the catheter and introducer needle assembly. Figures 2a-2d show how the extrusion projection 4 of the introducer needle of the present invention is made. . Figure 2a shows a top view of the introduction needle 1 with the opening of the groove 3 at the top of the introduction needle 1. Figure 2b shows the introduction needle! Side view. Figure 2c is a cross-sectional view of the extrusion projection 4 taken along line A-A of Figure 2b, in accordance with one embodiment of the present invention. Figure 2d is a cross-sectional view of the extrusion projection 4 taken along line A-A of Figure 2b in accordance with another embodiment of the present invention. For the convenience of description, it is necessary to establish a coordinate system. Referring to Figure 2a, the X axis is along the direction from the bottom to the top of the sheet, while the gamma axis is perpendicular to the direction of the sheet. -8 - 200810802 (6) As shown in Figs. 2c-2d, the introduction needle i of the present invention is pressed on the γ-axis, and the extruded material flows in the X-axis direction, thereby being pressed in the X-axis direction. Raised. The inner cavity 9 into which the needle 1 is introduced is flattened by the pressing action. Fig. 2 shows one of the embodiments of the present invention, in which the projection 4 formed by extrusion is formed by pressing or pinching the needle 1 at two points. The axis formed by the joining of the two points must intersect the longitudinal axis of the introduction needle 1. Due to the action of the squeezing or the squeezing, the cylinder into which the needle is introduced obtains a dimensional change, that is, the cylinder into which the needle is introduced is compressed and compressed to form a dumbbell-shaped projection, and this dimensional change is Symmetrical. After doing so, the inner cavity 9 of the introduction needle is flattened while the compressed material flows to both sides, forming a dumbbell shape due to mass conservation. As shown in Fig. 2c, in another embodiment of the present invention, the introduction needle can be pressed by two planes instead of the above two points to form an extrusion projection having an elliptical cross-sectional shape. Preferably, the groove 3 for observing blood return is closer to the tip of the introduction needle than the pressing projection 4. Thus, the pressing projection 4 will have two functions. One function is to act as a stop to prevent the needle tip of the introducer needle from moving out of the spring clip or needle shield (not shown). Another function is that when the introduction needle is bonded to the introduction needle holder 6 by using an adhesive, the inner cavity of the extrusion protrusion 4 can prevent the adhesive from flowing into the groove 3 of the introduction needle to block it. This will be further described below with reference to FIG. It should be noted that the annular space between the inner cavity of the catheter 2 and the outer surface of the introducer needle 1 should be sufficient for the rapid return of the return blood, and should not be due to the -9 - 200810802 (7) Existence and damage to this flow. The introduction needle 1 of the present invention with the groove 3 for blood return and the pressing projection 4 has several advantages over the introduction needle of the prior art. In the prior art introduction needle with a recirculation groove, an iron ring is used as a stop device which must be closer to the needle tip of the introduction needle than the return groove. Otherwise, if the recirculation groove is closer to the needle tip than the iron ring, the iron ring will have a rounded cross section, which will block the blood return path between the introduction needle and the lumen of the catheter, thereby preventing blood from flowing back. As shown in Fig. 3, in the assembly process of the introduction needle 1 and the introduction needle hub 6, it is necessary to dispense the adhesive along the position indicated by the arrow 7 to bond them together. Therefore, in order to prevent the adhesive from flowing into the inner cavity of the introduction needle and blocking the return groove 3 from the direction indicated by the arrow 8, there must be a step of squeezing the proximal end of the introduction needle in the prior art process, which would This prevents the adhesive from flowing into the lumen of the introducer needle. However, in the introduction needle 1 of the embodiment of the invention, it is preferable that the position of the groove 3 is set closer to the needle tip than the pressing protrusion 4. Thus, since the pressing projection 4 has a flattened cross-sectional area, it does not block the blood return passage between the introduction needle and the catheter. As shown in Fig. 1, the introducer needle structure of the present invention optimizes blood return so that it smoothly flows from the groove 3 to the proximal end, and flows through the pressing projections 4 therebetween. Last but not least, as shown in Fig. 3, in the assembly process of the introduction needle 1 and the introduction needle holder 6, an adhesive is required to bond the introduction needle 1 and the introduction needle holder 6. Therefore, there is a potential danger that the adhesive -10- (8) (8) 200810802 flows into the lumen of the introduction needle 1, thereby clogging the groove 3 badly, thereby blocking the backflow of blood. As already described above, in the prior art, an additional step is required to solve the problem that the adhesive flows into the lumen of the introducer needle 1. However, in the present invention, this additional step does not require 'because the flattened cavity of the pressing projection 4 will restrict the flow of the adhesive to the groove 3 to block it. Therefore, the extrusion boss 4 of the present invention will have two functions. One function is to play the role of the prior art iron ring stop device, which prevents the introduction needle 1 from moving out of the spring clip or the needle cover, and the other function is the action of the adhesive barrier, which plays a role in the prior art. The role of the proximal end of the extrusion. Therefore, the extrusion boss 4 of the present invention is less expensive than the prior art iron ring structure. It is to be noted that although the position of the groove 3 and the pressing projection 4 can be reversed, that is, the pressing projection 4 is closer to the needle tip than the groove 3. However, in this case, the returning blood will be somewhat restricted by the introduction of the inner cavity in which the needle 1 is flattened and reduced at the pressing projection 4 before flowing out of the groove 3. Moreover, 'in this case, in the assembly process of the introduction needle 1 and the introduction needle hub 6, as in the prior art, it is necessary to flatten the proximal end of the introduction needle to prevent the adhesive from flowing into the introduction needle. The cavity blocks the groove 3. The present invention has been described above by way of example with reference to the accompanying drawings, which are not to be construed as limiting. . The scope of the invention is defined by the claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view schematically showing an arrangement of protrusions formed by extrusion of the present invention and a blood return groove; FIG. 2 a - 2d schematically shows How the introduction needle of the present invention is extruded to form the projection; Fig. 3 shows the flow of the adhesive into the introduction needle hub and the introduction needle. [Main component symbol description] 1 : Introduction needle 2 : Catheter 3 : Groove 4 : Extrusion protrusion 6 : Introduction needle holder 9 : Inner cavity -12-