JP5818538B2 - Indwelling needle - Google Patents
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- JP5818538B2 JP5818538B2 JP2011145939A JP2011145939A JP5818538B2 JP 5818538 B2 JP5818538 B2 JP 5818538B2 JP 2011145939 A JP2011145939 A JP 2011145939A JP 2011145939 A JP2011145939 A JP 2011145939A JP 5818538 B2 JP5818538 B2 JP 5818538B2
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Description
本発明は、外針基内に逆止弁を備える留置針に関する。 The present invention relates to an indwelling needle provided with a check valve in an outer needle base.
従来、人工透析、輸液又は輸血などを行なう場合に、患者の身体に穿刺した内針を抜いたときには外針基内で血液が逆流することを阻止し、薬剤又は血液を輸液するときには輸液される液体の流路を形成する留置針が知られている（特許文献１）。特許文献１の留置針は、流入口から流出口へ液体が流れる円筒状の外針基と、この外針基の内部に配設され、流出口から流入口へ液体が逆流することを阻止する逆止弁と、逆止弁の開閉操作をするため、外針基内に摺動自在に配設されたプッシャーと、一端を外針基の流入口に挿入することでプッシャーを押動し逆止弁を導通状態にする輸液側コネクタのオスルアー部とを備える。 Conventionally, when performing artificial dialysis, infusion, blood transfusion, etc., blood is prevented from flowing back in the outer needle base when the inner needle punctured into the patient's body is removed, and infused when injecting medicine or blood An indwelling needle that forms a liquid flow path is known (Patent Document 1). The indwelling needle of Patent Document 1 is disposed inside a cylindrical outer needle base in which liquid flows from the inlet to the outlet, and prevents the liquid from flowing backward from the outlet to the inlet. In order to open and close the check valve and the check valve, the pusher is slidably disposed in the outer needle base, and one end is inserted into the inlet of the outer needle base to push the pusher and reverse And a male luer part of the infusion side connector for bringing the stop valve into a conductive state.
この留置針を用いて患者の体内に輸液する場合、まず、外針基の流出口から内針の先端が突出した状態で患者の身体に穿刺し、穿刺後に内針を抜いた後の血液の逆流を逆止弁が阻止する。その後、輸液するときには、オスルアー部の一端を外針基の流入口に挿入してプッシャーを押動し、逆止弁を導通状態にすることで流路を形成する。 When transfusion into the patient's body using this indwelling needle, first, the patient's body is punctured with the tip of the inner needle protruding from the outlet of the outer needle base, and after the puncture, A check valve prevents backflow. Thereafter, when infusion is performed, one end of the male luer part is inserted into the inflow port of the outer needle base, the pusher is pushed, and the check valve is turned on to form a flow path.
しかしながら、特許文献１に記載の逆止弁は、逆止弁の開閉操作をするためだけにプッシャーのような部品を備えているため、部品数が多くなり、製造コストが増加する。 However, since the check valve described in Patent Document 1 includes parts such as a pusher only for opening and closing the check valve, the number of parts increases and the manufacturing cost increases.
そこで、本発明は、少ない部品数で構成しても、内針を除去した際の血液の逆流を防止すると共に、輸液のためにオスルアー部を接続するときに流路を形成できる留置針を提供することを目的とする。 Therefore, the present invention provides an indwelling needle that can prevent the backflow of blood when the inner needle is removed and can form a flow path when connecting a male luer part for infusion even if it is configured with a small number of parts. The purpose is to do.
本発明の留置針は、輸液側コネクタのオスルアー部の一端が挿入され該オスルアー部を介して液体が流入される流入口と該液体が流出される流出口とを有する円筒状の外針基と、前記外針基の内部に配設され、前記流出口から前記流入口へ液体が逆流することを阻止する弾性体で形成された逆止弁とを備える留置針であって、前記逆止弁は、外壁が前記外針基の内壁に密接するよう円筒状に形成され、前記流入口側の端部の前記円筒状の内径は前記オスルアー部の挿入される一端の外径より小さく形成され、かつ、前記流出口側の端部に先細りのテーパ状のテーパ面を備え、該外針基に挿入されたオスルアー部の一端が、該流入口側の端部に当接した状態から更に押し込まれることにより、液体の逆流を阻止されている状態の前記流入口側の第１位置から、流出口側の第２位置に向かって押動されるものであり、前記外針基は、前記逆止弁が配設された位置よりも流出口側の内壁に、流入口側から流出口側に向けて突出した傾斜した端面を有する突部が設けられ、前記逆止弁は、前記押動によって、前記テーパ面のうち前記突部の端面と対向する面及び該面側の側面が、該突部の端面に当接し更に流出口側に向かって押し込まれることで、該突部によって径方向に押圧され、該突部の端面に沿うように変形するとともに、逆止弁全体が、該突部と外針基の内壁とに挟まれることで径方向断面がＵ字状に変形し、前記逆止弁の外周側に液体の流路を形成することを特徴とする。 The indwelling needle of the present invention includes a cylindrical outer needle base having an inflow port into which one end of a male luer part of an infusion side connector is inserted and a liquid flows in through the male luer part, and an outflow port from which the liquid flows out. An indwelling needle that is disposed inside the outer needle base and is formed of an elastic body that prevents a liquid from flowing backward from the outlet to the inlet, the check valve Is formed in a cylindrical shape so that the outer wall is in close contact with the inner wall of the outer needle base, the cylindrical inner diameter of the end on the inlet side is formed smaller than the outer diameter of one end into which the male luer part is inserted, In addition, the end portion on the outlet side has a tapered tapered surface, and one end of the male luer portion inserted into the outer needle base is further pushed in from the state in contact with the end portion on the inlet side. By the side of the inlet side in a state in which the back flow of the liquid is prevented 1 position state, and are not to be pushed toward the second position of the outlet side, the outer hub is the inner wall of the outlet side of a position where the check valve is disposed, the inlet A protruding portion having an inclined end surface protruding from the side toward the outlet side, and the check valve is configured such that, by the pushing, the surface of the tapered surface that faces the end surface of the protruding portion and the surface side The side surface of the projection abuts against the end surface of the projection and is further pushed toward the outlet, so that the projection is pressed radially by the projection and deforms along the end surface of the projection, and the check valve entire, radial cross by sandwiched between the inner wall of the projecting portion and the outer needle hub is deformed into a U-shape, and wherein the Turkey to form a flow path of liquid on the outer peripheral side of the check valve To do.
本発明の留置針によれば、逆止弁がオスルアー部が外針基の流入口に挿入される前の第１位置に位置するときは、逆止弁が流出口から流入口へ液体が逆流することを阻止するため、外針基の流出口から内針の先端が突出した状態で患者の身体に穿刺し、穿刺後に内針を抜いた後の血液の逆流を阻止することができる。 According to the indwelling needle of the present invention, when the check valve is located at the first position before the male luer part is inserted into the inlet of the outer needle base, the check valve is in a reverse flow from the outlet to the inlet. In order to prevent this, it is possible to prevent the backflow of blood after puncturing the patient's body with the tip of the inner needle protruding from the outlet of the outer needle base and removing the inner needle after puncturing.
また、逆止弁は、オスルアー部が外針基の流入口に挿入されると第２位置に移動し、突部によって径方向に押圧される。これによって、オスルアー部から流出した薬剤又は血液などの液体が流出口へ流れる流路が逆止弁の外周側に形成される。このため、従来のように、逆止弁を開閉するためだけのプッシャーのような部品を不要にし、部品数を少なくすることができる。 The check valve moves to the second position when the male luer portion is inserted into the inflow port of the outer needle base, and is pressed in the radial direction by the protrusion. As a result, a flow path through which a liquid such as a medicine or blood flowing out from the male luer part flows to the outlet is formed on the outer peripheral side of the check valve. This eliminates the need for parts such as a pusher used to open and close the check valve as in the prior art, and reduces the number of parts.
本発明においては、突部を流入口側から流出口側に向けて円弧状に突出させ、逆止弁に流入口側で且つ突部側の壁部に、当該逆止弁が突部によって径方向に押圧されたときにオスルアー部の開口から流出口側に向けて投影した領域内を避ける形状の切欠きを設けることが好ましい。これによって、逆止弁は、第２位置に移動した際に、切欠き側の側面が突部の傾斜に沿うように変形される。このため、逆止弁の移動を滑らかにすることができ、オスルアー部が挿入される際の抵抗を小さくできる。また、切欠きは、突部側に設けられているため、傾斜に沿う側壁の面積が小さくなる。更に、切欠きは、第２位置に移動した際に当該逆止弁が突部によって径方向に押圧されてオスルアー部の開口から流出口側に向けて投影した領域内を避ける形状であるので液体の流路を確保できる。このため、オスルアー部から流出した薬剤又は血液などの液体が流出口へ流される液体の流入抵抗が小さく、円滑な輸液を行なうことができる。 In the present invention, the protrusion is projected in an arc shape from the inlet side toward the outlet side, and the check valve has a diameter by the protrusion on the inlet side and the wall portion on the protrusion side of the check valve. It is preferable to provide a notch having a shape that avoids the area projected from the opening of the male luer portion toward the outlet when pressed in the direction. Thereby, when the check valve moves to the second position, the side surface on the notch side is deformed so as to follow the inclination of the protrusion. For this reason, the check valve can be moved smoothly, and the resistance when the male luer portion is inserted can be reduced. Moreover, since the notch is provided in the protrusion side, the area of the side wall along the inclination is reduced. Further, when the notch is moved to the second position, the check valve is pressed in the radial direction by the protrusion to avoid the area projected from the opening of the male luer part toward the outlet side. Can be secured. For this reason, the inflow resistance of the liquid by which liquids, such as a chemical | medical agent or blood which flowed out from the male luer part, are flowed to an outflow port is small, and smooth infusion can be performed.
本発明においては、逆止弁の流出口側の端部を先細りのテーパ状に形成することが好ましい。これによって、突部が逆止弁を径方向に押圧しやすくなり、逆止弁を押動するときの抵抗を小さくできる。更に、突部が流入口側から流出口側に向けて円弧状に突出している場合において、逆止弁は、この円弧状の縁に沿うように変形しやすくなる。 In the present invention, it is preferable that the end portion on the outlet side of the check valve is formed in a tapered shape. This makes it easier for the protrusion to press the check valve in the radial direction, and the resistance when the check valve is pushed can be reduced. Further, when the protrusion protrudes in an arc shape from the inlet side toward the outlet side, the check valve is easily deformed along the arc-shaped edge.
本発明においては、逆止弁が第２位置に移動した際には、突部と外針基の内壁とで逆止弁を挟持させることが好ましい。これによれば、押圧された逆止弁の弾性によって、外針基に挿入されたオスルアー部を流入口側に押動することを防止できる。 In the present invention, when the check valve moves to the second position, the check valve is preferably sandwiched between the protrusion and the inner wall of the outer needle base. According to this, it is possible to prevent the male luer portion inserted into the outer needle base from being pushed toward the inflow port side by the elasticity of the pressed check valve.
更に、逆止弁が挟持されることで、オスルアー部を抜いた後であっても、逆止弁は第２位置に留まったままとなる。従って、逆止弁が、外針基内の第１位置に位置するときにはオスルアー部を挿入する前であり、外針基内の第２位置に位置するときにはオスルアー部を挿入した後であることを判別することができる。これによって、例えば、人工透析、輸液又は輸血などのためにオスルアー部を挿入した後か否かを逆止弁の位置によって判別でき、留置針１の再使用を防止しやすくなる。 Furthermore, since the check valve is sandwiched, the check valve remains in the second position even after the male luer part is pulled out. Therefore, when the check valve is located at the first position in the outer needle base, it is before inserting the male luer part, and when it is located at the second position in the outer needle base, it is after inserting the male luer part. Can be determined. Accordingly, for example, whether or not the male luer part has been inserted for artificial dialysis, infusion, blood transfusion, or the like can be discriminated by the position of the check valve, and the indwelling needle 1 can be easily prevented from being reused.
本発明においては、逆止弁は、弾性体で形成されており、第２位置に移動した後に、オスルアー部が外針基から外れた場合には、当該逆止弁の弾性力によって第１位置に戻るように突部と外針基の内壁との距離を設定することもできる。この場合には、オスルアー部を抜いた後に再度逆流を防止したい場合には、逆止弁が第１位置に戻ることで再度逆流を防止することができる。 In the present invention, the check valve is formed of an elastic body, and when the male luer part is detached from the outer needle base after moving to the second position, the check valve is elastically moved to the first position by the elastic force of the check valve. It is also possible to set the distance between the protrusion and the inner wall of the outer needle base so as to return to. In this case, when it is desired to prevent backflow again after removing the male luer part, the backflow can be prevented again by returning the check valve to the first position.
本発明においては、突部を２つの板状片で構成し、オスルアー部の開口から流出口側に向けて投影した領域外に位置させることが好ましい。突部は、逆止弁を径方向に押圧して逆止弁の外周側に液体の流路を形成するため、逆止弁及び２つの板状片のいずれもオスルアー部の開口から流出口側に向けて投影した領域外に位置する。従って、オスルアー部から流出した薬剤又は血液などの液体が流出口へ流される液体の流入抵抗が小さく、円滑な輸液を行なうことができる。 In the present invention, it is preferable that the protrusion is composed of two plate-like pieces and is located outside the region projected from the opening of the male luer part toward the outlet. Since the protrusion presses the check valve in the radial direction to form a liquid flow path on the outer peripheral side of the check valve, both of the check valve and the two plate-like pieces are on the outlet side from the opening of the male luer part. It is located outside the area projected toward. Therefore, the inflow resistance of the liquid that flows out from the male luer part such as medicine or blood to the outlet is small, and smooth infusion can be performed.
本発明において、突部は、外側の側面がオスルアー部の開口から流出口側に向けて投影した領域よりも外針基の内壁側になるようにすると共に、オスルアー部の開口から流出口側に向けて投影した領域内を避けるように空間が設けられることもできる。また、この場合においては、突部を断面Ｕ字状に形成することができる。 In the present invention, the protrusion is arranged such that the outer side surface is on the inner wall side of the outer needle base from the region projected from the opening of the male luer part toward the outlet side, and from the opening of the male luer part to the outlet side. A space may be provided so as to avoid the area projected toward. In this case, the protrusion can be formed in a U-shaped cross section.
図１は、本発明の実施形態の留置針１を表す分解斜視図である。この留置針１は、中身を視認可能な合成樹脂を材料として円筒状に形成された外針基２と、弾性体であるゴムを材料として円筒状に形成された逆止弁３と、軟質材料を用いて管状に形成されたオスルアー部４とを備える。 FIG. 1 is an exploded perspective view showing an indwelling needle 1 according to an embodiment of the present invention. The indwelling needle 1 includes an outer needle base 2 formed in a cylindrical shape using a synthetic resin whose contents can be visually recognized as a material, a check valve 3 formed in a cylindrical shape using rubber as an elastic material, and a soft material. And a male luer part 4 formed in a tubular shape using the.
外針基２は、両端に内部で導通された開口部を有しており、一端の開口部（図１の右方の開口部）を、薬剤又は血液などの液体を輸液するときにオスルアー部４の一端が挿入されて液体が流入される流入口２１とし、他端の開口部（図１の左方の開口部）を、流入口２１から流入された液体を流出する流出口２２とする。また、外針基２の内部には、外壁が外針基２の内壁に密接するように逆止弁３が配設されている。 The outer needle base 2 has openings that are internally connected to both ends, and the male luer portion is used when a liquid such as a drug or blood is infused through the opening at one end (the opening on the right side in FIG. 1). 4 is used as an inflow port 21 into which liquid is introduced, and the opening at the other end (the left-side opening in FIG. 1) is used as an outflow port 22 through which the liquid flowing in from the inflow port 21 flows out. . A check valve 3 is disposed inside the outer needle base 2 so that the outer wall is in close contact with the inner wall of the outer needle base 2.
外針基２の流入口２１にはオスルアー部４の一端が挿入されるため、流入口２１の内径は、オスルアー部４の外径以上に形成されている。また、オスルアー部４の端部が逆止弁３の内部に入ることを防止するため、逆止弁３の流入口２１側の端部の内径は、オスルアー部４の外径より小さく形成されている。このため、挿入されたオスルアー部４の一端が外針基２内に配設された逆止弁３の流入口２１側の端部に当接した状態で更に押し込まれることにより、逆止弁３を流入口２１側から流出口２２側に向かって押動できる。 Since one end of the male luer part 4 is inserted into the inlet 21 of the outer needle base 2, the inner diameter of the inlet 21 is formed to be larger than the outer diameter of the male luer part 4. In order to prevent the end of the male luer part 4 from entering the check valve 3, the inner diameter of the end of the check valve 3 on the inlet 21 side is smaller than the outer diameter of the male luer part 4. Yes. For this reason, when the inserted male luer part 4 is further pushed in with the end of the check valve 3 disposed in the outer needle base 2 in contact with the end of the check valve 3, the check valve 3 Can be pushed from the inlet 21 side toward the outlet 22 side.
外針基２は、内部に逆止弁３が配設されている胴部２３と、胴部２３に比べて小径であり胴部２３から突出するように設けられた外針支持部２４とから構成される。胴部２３の一端には流入口２１があり、他端は外針支持部２４が突出している。また、外針支持部２４の胴部２３側とは逆側の一端には流出口２２がある。 The outer needle base 2 includes a body portion 23 in which the check valve 3 is disposed, and an outer needle support portion 24 that is smaller in diameter than the body portion 23 and is provided so as to protrude from the body portion 23. Composed. An inflow port 21 is provided at one end of the body portion 23, and an outer needle support portion 24 projects from the other end. The outer needle support 24 has an outflow port 22 at one end opposite to the body 23 side.
外針支持部２４の流出口２２には、外針２５の一端が挿着されている。外針２５は軟質部材で管状に形成されており、内針２６を外針基２の流入口２１から摺動自在に挿入できる。内針２６は、中実且つ針状に形成されており、外径を外針２５の内径とほぼ同じに形成している。このため、内針２６の外側面と外針２５の内側面との間の隙間をほぼ無くすことができ、管状すなわち中空の外針２５の穿刺時の抵抗を弱めることができる。 One end of the outer needle 25 is inserted into the outflow port 22 of the outer needle support portion 24. The outer needle 25 is a soft member formed in a tubular shape, and the inner needle 26 can be slidably inserted from the inlet 21 of the outer needle base 2. The inner needle 26 is solid and needle-shaped, and has an outer diameter that is substantially the same as the inner diameter of the outer needle 25. For this reason, the clearance gap between the outer surface of the inner needle 26 and the inner surface of the outer needle 25 can be eliminated, and resistance at the time of puncture of the tubular or hollow outer needle 25 can be weakened.
外針基２の胴部２３の図１の上方の内壁には、流入口２１側から流出口２２側に向けて円弧状に突出した２つの板状片２ａ，２ｂが外針基２と一体に設けられている。この２つの板状片２ａ，２ｂは、逆止弁３が２つの板状片２ａ，２ｂに当接する位置よりも流入口２１側に配設しても、逆止弁３の流入口２１側の一端が外針基２の流入口２１からはみ出さないような位置に設けられている。また、２つの板状片２ａ，２ｂは、互いに空間を設けて平行に並べられており、流入口２１に挿入されたオスルアー部４の開口から流出口２２側に向けて投影した領域外に位置するように設けられている。 Two plate-like pieces 2 a and 2 b projecting in an arc shape from the inflow port 21 side to the outflow port 22 side are integrated with the outer needle base 2 on the inner wall in the upper part of the body portion 23 of the outer needle base 2 in FIG. Is provided. Even if these two plate-like pieces 2a and 2b are arranged closer to the inlet 21 than the position where the check valve 3 abuts against the two plate-like pieces 2a and 2b, the inlet 21 side of the check valve 3 One end of the outer needle base 2 is provided at a position that does not protrude from the inlet 21 of the outer needle base 2. The two plate-like pieces 2a and 2b are arranged in parallel with a space between each other, and are located outside the region projected from the opening of the male luer part 4 inserted into the inflow port 21 toward the outflow port 22 side. It is provided to do.
次に、図２を参照して逆止弁３の形状について説明する。図２は、逆止弁３の形状を表す図であり、図２（ａ）は正面図（図１の左側、すなわち流出口２２側から見た図）、図２（ｂ）は右側面図、図２（ｃ）は平面図、図２（ｄ）は底面図、図２（ｅ）は背面図、図２（ｆ）は右背面側からの斜視図である。 Next, the shape of the check valve 3 will be described with reference to FIG. 2A and 2B are views showing the shape of the check valve 3. FIG. 2A is a front view (a view seen from the left side of FIG. 1, that is, the outlet 22 side), and FIG. 2B is a right side view. 2C is a plan view, FIG. 2D is a bottom view, FIG. 2E is a rear view, and FIG. 2F is a perspective view from the right rear side.
図２に示されるように、逆止弁３の外針基２の流出口２２側の端部には、先細りのテーパ状に形成されたテーパ面３１を備える。テーパ状の先端部には、一文字状のスリット３２が設けられ、このスリット３２は、流出口２２側から流入口２１側への液体の逆流を阻止するように形成されている。尚、スリット３２は、一文字状である必要はなく、十文字状又はＹ字状であってもよい。留置針１を人体に穿刺するときには、内針２６がスリット３２に貫通した状態の留置針１を用いる。スリット３２は、内針２６が貫通した状態であっても、流出口２２側から流入口２１側への液体の逆流を阻止可能となっている。また、逆止弁３のスリット３２は、内針２６を抜いた後、逆止弁３の弾性によって閉じられる。このため、内針２６を抜いた後であっても、流出口２２側から流入口２１側への液体の逆流を阻止できる。 As shown in FIG. 2, the end of the check needle 3 on the outlet 22 side of the outer needle base 2 is provided with a tapered surface 31 formed in a tapered shape. A one-letter-shaped slit 32 is provided at the tapered tip, and the slit 32 is formed so as to prevent the backflow of liquid from the outlet 22 side to the inlet 21 side. In addition, the slit 32 does not need to be a single character shape, and may be a cross shape or a Y shape. When the indwelling needle 1 is punctured into the human body, the indwelling needle 1 with the inner needle 26 penetrating through the slit 32 is used. The slit 32 can prevent the backflow of the liquid from the outlet 22 side to the inlet 21 side even when the inner needle 26 is penetrated. The slit 32 of the check valve 3 is closed by the elasticity of the check valve 3 after the inner needle 26 is pulled out. For this reason, even after the inner needle 26 is pulled out, the backflow of the liquid from the outflow port 22 side to the inflow port 21 side can be prevented.
また、逆止弁３には、流入口（２１）側で且つ突部（２ａ，２ｂ）側の壁部に台形状の切欠き３３が設けられている。 Further, the check valve 3 is provided with a trapezoidal notch 33 on the wall portion on the inlet (21) side and on the protruding portion (2a, 2b) side.
次に、図３〜図５を参照して、上記のように構成された留置針１の作動について説明する。ここで、図３及び図４で示されるときの逆止弁３の位置が、本発明の第１位置に該当し、図５で示されるときの逆止弁３の位置が、本発明の第２位置に該当する。まず本実施形態の留置針１を人体に穿刺する場合について説明する。 Next, the operation of the indwelling needle 1 configured as described above will be described with reference to FIGS. Here, the position of the check valve 3 shown in FIGS. 3 and 4 corresponds to the first position of the present invention, and the position of the check valve 3 shown in FIG. Corresponds to position 2. First, the case where the indwelling needle 1 of this embodiment is punctured to a human body is demonstrated.
図３は、人工透析、輸液又は輸血などを行なう場合に患者の体内に輸液するために留置針１を人体に穿刺する際、内針２６が外針２５から突出しているときの外針基２及び逆止弁３の状態を示す図であり、図３（ａ）は外針基２の軸線中心の断面図であり、図３（ｂ）は図３（ａ）のＡ−Ａ線断面図である。 FIG. 3 shows the outer needle base 2 when the inner needle 26 protrudes from the outer needle 25 when the indwelling needle 1 is punctured into the human body for infusion into the patient's body when performing artificial dialysis, infusion or blood transfusion. FIG. 3A is a cross-sectional view of the center of the outer needle base 2, and FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A. It is.
図３に示されるように、施術者は、内針２６が、外針基２の流入口２１、逆止弁３のスリット３２、２つの板状片２ａ，２ｂの間に設けられた空間、及び外針２５を介して先端部分を外針２５から突出した状態の留置針１を用いて、患者の体内に内針２６と外針２５を穿刺する。 As shown in FIG. 3, the practitioner determines that the inner needle 26 is a space provided between the inlet 21 of the outer needle base 2, the slit 32 of the check valve 3, and the two plate-like pieces 2 a and 2 b, The inner needle 26 and the outer needle 25 are punctured into the patient's body using the indwelling needle 1 with the tip portion protruding from the outer needle 25 via the outer needle 25.
留置針１を人体に穿刺した後に、内針２６を外針基２から抜いたときの外針基２及び逆止弁３の状態が図４に示される。図４（ａ）は図３（ａ）と同様に外針基２の軸線中心の断面図であり、図４（ｂ）は図４（ａ）のＢ−Ｂ線断面図である。内針２６を外針基２から抜くことで、血液が患者の体内から外針２５の内部を通って外針基２の胴部２３に逆流してくる。 The state of the outer needle base 2 and the check valve 3 when the inner needle 26 is removed from the outer needle base 2 after the indwelling needle 1 is punctured into the human body is shown in FIG. 4A is a cross-sectional view of the center of the axis of the outer needle base 2 as in FIG. 3A, and FIG. 4B is a cross-sectional view taken along the line BB in FIG. 4A. By removing the inner needle 26 from the outer needle base 2, blood flows back from the patient's body through the inside of the outer needle 25 to the body portion 23 of the outer needle base 2.
上述したように、逆止弁３の外壁が外針基２の胴部２３の内壁に密着していると共に、逆止弁３のスリット３２が流出口２２側から流入口２１側への液体の逆流を阻止するように形成されている。このため、本実施形態の留置針１によって、外針基２の胴部２３に逆流した血液が、逆止弁３の流出口２２側の端部よりも流入口２１側に流れることが阻止される。 As described above, the outer wall of the check valve 3 is in close contact with the inner wall of the body portion 23 of the outer needle base 2, and the slit 32 of the check valve 3 causes liquid to flow from the outlet 22 side to the inlet 21 side. It is formed so as to prevent backflow. For this reason, the indwelling needle 1 of the present embodiment prevents blood that has flowed back to the body 23 of the outer needle base 2 from flowing toward the inlet 21 rather than the end of the check valve 3 on the outlet 22 side. The
内針２６を外針基２から抜いた後、オスルアー部４を外針基２の流入口２１に挿入したときの外針基２及び逆止弁３の状態が図５に示される。図５（ａ）は、図３（ａ）及び図４（ａ）と同様に外針基２の軸線中心の断面図であり、図５（ｂ）は図５（ａ）のＣ−Ｃ線断面図であり、図５（ｃ）は図５（ａ）のＤ−Ｄ線断面図である。図５の破線は、オスルアー部４の開口から流出口２２側に向けて投影した領域を示す。 FIG. 5 shows the state of the outer needle base 2 and the check valve 3 when the male luer portion 4 is inserted into the inlet 21 of the outer needle base 2 after the inner needle 26 is pulled out from the outer needle base 2. 5A is a cross-sectional view of the center of the axis of the outer needle base 2 as in FIGS. 3A and 4A, and FIG. 5B is a CC line in FIG. 5A. It is sectional drawing, FIG.5 (c) is the DD sectional view taken on the line of Fig.5 (a). The broken line of FIG. 5 shows the area | region projected toward the outflow port 22 side from opening of the male luer part 4. FIG.
逆止弁３は、外針基２に挿入されたオスルアー部４の端部によって、流入口２１側の第１位置から流出口２２側の第２位置に向かって押動される。この押動の途中で、逆止弁３のテーパ面３１が形成されている側の端部が２つの板状片２ａ，２ｂに当接する。この状態で更に流出口２２側に向かって押し込まれることで、逆止弁３は、切欠き３３側の側面が２つの板状片２ａ，２ｂによって径方向に押圧され、２つの板状片２ａ，２ｂの円弧状の側面に沿うように変形する。逆止弁３は、この変形と共に、２つの板状片２ａ，２ｂと外針基２の内壁とに挟まれることで径方向断面が図５（ｂ）に示されるような略Ｕ字状に変形し、逆止弁３の外周側に液体の流路を形成する。 The check valve 3 is pushed by the end of the male luer part 4 inserted into the outer needle base 2 from the first position on the inlet 21 side toward the second position on the outlet 22 side. In the middle of this pushing, the end of the check valve 3 on the side where the tapered surface 31 is formed contacts the two plate-like pieces 2a and 2b. When the check valve 3 is further pushed toward the outlet 22 in this state, the side surface on the notch 33 side is pressed in the radial direction by the two plate-like pieces 2a and 2b, and the two plate-like pieces 2a are pressed. , 2b is deformed along the arc-shaped side surface. Along with this deformation, the check valve 3 is sandwiched between the two plate-like pieces 2a and 2b and the inner wall of the outer needle base 2 so that the radial cross section is substantially U-shaped as shown in FIG. The liquid flow path is formed on the outer peripheral side of the check valve 3 by deformation.
また、切欠き３３が２つの板状片２ａ，２ｂ側に設けられているため、傾斜に沿う側壁の面積が小さくなる。これによって、図５（ａ）及び図５（ｃ）に示されるように、オスルアー部４の開口から流出口２２側に向けて投影した領域内（図５（ａ）の破線）に、切欠き３３によってできる空間が位置しているため、逆止弁３の壁部が輸液のときの流路を妨げることがない。また、２つの板状片２ａ，２ｂは、流入口２１に挿入されたオスルアー部４の開口から流出口２２側に向けて投影した領域外に位置するように空間を設けている。このため、２つの板状片２ａ，２ｂは、輸液のときの流路を妨げることがない。 Moreover, since the notch 33 is provided on the two plate-like pieces 2a and 2b, the area of the side wall along the inclination is reduced. As a result, as shown in FIGS. 5A and 5C, a notch is formed in the region projected from the opening of the male luer part 4 toward the outlet 22 (broken line in FIG. 5A). Since the space formed by 33 is located, the flow path when the wall portion of the check valve 3 is infused is not obstructed. The two plate-like pieces 2a and 2b are provided with a space so as to be located outside the region projected from the opening of the male luer part 4 inserted into the inflow port 21 toward the outflow port 22 side. For this reason, the two plate-like pieces 2a and 2b do not obstruct the flow path at the time of infusion.
従って、流入口２１から流入してきた液体が、逆止弁３の切欠き３３によってできる空間を通り、２つの板状片２ａ，２ｂの間に設けられた空間を通って、流出口２２に流出する。このように、逆止弁３が第２位置に位置している際には、２つの板状片２ａ，２ｂ及び切欠き３３によって、オスルアー部４の開口から流出口２２側に向けて投影した領域内に流路を妨げる妨害物が存在しないため、流される液体の流入抵抗が小さく、円滑な輸液を行なうことができる。 Accordingly, the liquid flowing in from the inlet 21 passes through the space formed by the notch 33 of the check valve 3 and flows out to the outlet 22 through the space provided between the two plate-like pieces 2a and 2b. To do. Thus, when the check valve 3 is located at the second position, the projection is projected from the opening of the male luer portion 4 toward the outlet 22 by the two plate-like pieces 2a and 2b and the notch 33. Since there are no obstructions that obstruct the flow path in the region, the inflow resistance of the flowed liquid is small, and smooth infusion can be performed.
また、逆止弁３が第２位置に位置しているときに、２つの板状片２ａ，２ｂと外針基２の内壁とによって、逆止弁３を挟持するように突部としての２つの板状片２ａ，２ｂが形成されている。このため、逆止弁３が第２位置に達することで、施術者がオスルアー部４の押動を止めたとしても、逆止弁３は第２位置に留まったままとなる。従って、径方向に押圧されている逆止弁３の弾性によって、外針基２に挿入されたオスルアー部４を流入口２１側に押動することを防止できる。 Further, when the check valve 3 is located at the second position, the two projecting parts 2 so as to sandwich the check valve 3 by the two plate-like pieces 2 a and 2 b and the inner wall of the outer needle base 2. Two plate-like pieces 2a and 2b are formed. For this reason, even if the practitioner stops pushing the male luer part 4 by the check valve 3 reaching the second position, the check valve 3 remains in the second position. Therefore, it is possible to prevent the male luer portion 4 inserted into the outer needle base 2 from being pushed toward the inflow port 21 due to the elasticity of the check valve 3 pressed in the radial direction.
更に、オスルアー部４を抜いた後であっても、逆止弁３は第２位置に留まったままとなる。換言すると、留置針１の使用後にオスルアー部４を抜いた後であっても逆止弁３は第２位置に留まったままとなる。このため、逆止弁３が、外針基２内の第１位置に位置するときにはオスルアー部４を挿入する前であり、外針基２内の第２位置に位置するときにはオスルアー部４を挿入した後であることを判別することができる。 Further, even after the male luer part 4 is pulled out, the check valve 3 remains in the second position. In other words, the check valve 3 remains in the second position even after the male luer part 4 is pulled out after the indwelling needle 1 is used. Therefore, when the check valve 3 is located at the first position in the outer needle base 2, it is before the male luer part 4 is inserted, and when the check valve 3 is located at the second position in the outer needle base 2, the male luer part 4 is inserted. Can be determined after
更に、上述したように、外針基２は、中身を視認可能な材料で形成されているため、逆止弁３が第１位置にあるか（オスルアー部４を挿入する前か）、第２位置にあるか（オスルアー部４を挿入した後か）を視覚的に簡単に判別することができる。これによって、使用済みの留置針１を再使用することを防止しやすくなる。但し、外針基２が中身を視認可能ではない材料で形成されているものであってもよい。この場合には、流入口２１側から流出口２２側へ向かって見ることで逆止弁３の位置を確認すればよい。 Further, as described above, since the outer needle base 2 is formed of a material whose contents can be visually recognized, whether the check valve 3 is in the first position (before the male luer portion 4 is inserted) or second. It is possible to easily visually determine whether it is in a position (after inserting the male luer part 4). This makes it easier to prevent the used indwelling needle 1 from being reused. However, the outer needle base 2 may be made of a material whose contents are not visible. In this case, the position of the check valve 3 may be confirmed by looking from the inlet 21 side toward the outlet 22 side.
以上のように、本実施形態の留置針１は、逆止弁３の開閉操作をするためだけにプッシャーのような部品を備えることなく少ない部品数で構成しても、留置針１を人体に穿刺して内針２６を除去した際の血液の逆流を防止できると共に、輸液をする際にはオスルアー部４を外針基２に挿入することで、突部としての板状片２ａ，２ｂによって、輸液する液体の流路を形成できる。 As described above, even if the indwelling needle 1 of the present embodiment is configured with a small number of parts without providing a part such as a pusher only for opening and closing the check valve 3, the indwelling needle 1 is attached to the human body. When the inner needle 26 is removed by puncturing, the backflow of blood can be prevented, and when transfusion is performed, the male luer part 4 is inserted into the outer needle base 2 so that the plate-like pieces 2a and 2b as protrusions are used. The flow path of the liquid to be infused can be formed.
また、本実施形態の留置針１は、逆止弁３に台形状の切欠き３３を設けている。これによって、逆止弁３が、２つの板状片２ａ，２ｂと外針基２の内壁とに挟まれることで径方向断面が変形しているときに、逆止弁３の壁部が輸液のときの流路を妨げず、流される液体の流入抵抗が小さく、円滑な輸液を行なうことができる。 Further, the indwelling needle 1 of the present embodiment is provided with a trapezoidal notch 33 in the check valve 3. Accordingly, when the check valve 3 is sandwiched between the two plate-like pieces 2a and 2b and the inner wall of the outer needle base 2, the wall of the check valve 3 is infused when the radial cross section is deformed. In this case, the inflow resistance of the flowed liquid is small without obstructing the flow path, and smooth infusion can be performed.
なお、本実施形態では、２つの板状片２ａ，２ｂを平行に並べたが、必ずしも平行に並べる必要はなく、オスルアー部４の開口から流出口２２側に向けて投影した領域内に２つの板状片２ａ，２ｂが位置しなければよい。例えば、外針基２の内周壁側からハの字状に突出する形状であってもよい。 In the present embodiment, the two plate-like pieces 2a and 2b are arranged in parallel. However, the two pieces are not necessarily arranged in parallel, and two pieces are not necessarily arranged in parallel, but two areas are projected in the region projected from the opening of the male luer part 4 toward the outlet 22 side. It suffices if the plate-like pieces 2a and 2b are not positioned. For example, the shape which protrudes in the shape of a square from the inner peripheral wall side of the outer needle base 2 may be sufficient.
また、本実施形態では、突部を２つの板状片２ａ，２ｂで構成したがこれに限るものではない。例えば、図６に示されるように、突部を１つ設け、突部の外側の側面が、オスルアー部４の開口から流出口２２側に向けて投影した領域よりも外針基２の内壁側になるようにすると共に、オスルアー部４の開口から流出口２２側に向けて投影した領域内を避けるように繰り抜くなどによって空間を設けてもよい。例えば、図６（ａ）に示されるように１つの突部２ｃを断面Ｕ字状に形成して空間２ｃａを設けたり、図６（ｂ）に示されるように1つの突部２ｄを繰り抜いて断面Ｏ字状に形成し空間２ｄａを設けてもよい。図６は、外針基２内の突部のみを示す斜視図であり、左側が流出口２２側となっている。これによっても、輸液する液体の流路を形成できる。 Moreover, in this embodiment, although the protrusion was comprised with the two plate-shaped pieces 2a and 2b, it is not restricted to this. For example, as shown in FIG. 6, one protrusion is provided, and the outer side surface of the protrusion is closer to the inner wall side of the outer needle base 2 than the region projected from the opening of the male luer part 4 toward the outlet 22 side. In addition, the space may be provided by pulling out so as to avoid the area projected from the opening of the male luer part 4 toward the outlet 22 side. For example, as shown in FIG. 6 (a), one protrusion 2c is formed in a U-shaped cross section to provide a space 2ca, or as shown in FIG. 6 (b), one protrusion 2d is pulled out. The space 2da may be provided by forming an O-shaped cross section. FIG. 6 is a perspective view showing only the protrusion in the outer needle base 2, and the left side is the outlet 22 side. Also by this, the flow path of the liquid to be infused can be formed.
また、本実施形態では、突部としての２枚の板状片２ａ，２ｂを、外針基２の内壁とで逆止弁３を挟持するように形成しているがこれに限らない。オスルアー部４を抜いた後に、逆止弁３の弾性力によって外針基２内の第２位置から第１位置に移動可能なように突部と外針基２の内壁との距離を設定し、この距離になるような大きさに突部を形成してもよい。これによって、オスルアー部４を抜いた後に再度逆流を防止したい場合には、逆止弁３が第１位置に戻り、再度逆流を防止することができる。このように、本発明の留置針は、オスルアー部４を抜いた後に、再使用を防止できる留置針と再度逆流を防止できる留置針とのいずれか片方を提供でき、使用者が目的に応じて選択することができる。 Further, in the present embodiment, the two plate-like pieces 2 a and 2 b as the projecting parts are formed so as to sandwich the check valve 3 with the inner wall of the outer needle base 2, but this is not restrictive. After removing the male luer part 4, the distance between the protrusion and the inner wall of the outer needle base 2 is set so that it can be moved from the second position in the outer needle base 2 to the first position by the elastic force of the check valve 3. The protrusion may be formed in such a size as to be this distance. As a result, when it is desired to prevent backflow again after the male luer part 4 is pulled out, the check valve 3 returns to the first position, and backflow can be prevented again. Thus, the indwelling needle of the present invention can provide either one of the indwelling needle that can prevent reuse and the indwelling needle that can prevent backflow again after the male luer part 4 is pulled out. You can choose.
また、本実施形態では、逆止弁３の切欠き３３を台形状に設けているがこれに限らない。切欠き３３によって液体の流路を確保できればよく、切欠き３３の形状としては、Ｕ字状、矩形及び三角形などであってもよい。 Moreover, in this embodiment, although the notch 33 of the check valve 3 is provided in a trapezoidal shape, the present invention is not limited to this. It suffices if a liquid flow path can be secured by the notch 33, and the shape of the notch 33 may be a U-shape, a rectangle, a triangle, or the like.
１…留置針、２…外針基、２ａ，２ｂ…板状片（突部）、２１…流入口、２２…流出口、３…逆止弁、３３…切欠き、４…オスルアー部。 DESCRIPTION OF SYMBOLS 1 ... Indwelling needle, 2 ... Outer needle base, 2a, 2b ... Plate-shaped piece (projection), 21 ... Inlet, 22 ... Outlet, 3 ... Check valve, 33 ... Notch, 4 ... Male luer part.
Claims (1)
前記外針基（２）の内部に配設され、前記流出口（２２）から前記流入口（２１）へ液体が逆流することを阻止する弾性体で形成された逆止弁（３）とを備える留置針（１）であって、
前記逆止弁（３）は、外壁が前記外針基（２）の内壁に密接するよう円筒状に形成され、前記流入口（２１）側の端部の前記円筒状の内径は前記オスルアー部（４）の挿入される一端の外径より小さく形成され、かつ、前記流出口（２２）側の端部に先細りのテーパ状のテーパ面（３１）を備え、該外針基（２）に挿入されたオスルアー部（４）の一端が、該流入口（２１）側の端部に当接した状態から更に押し込まれることにより、液体の逆流を阻止されている状態の前記流入口（２１）側の第１位置から、流出口（２２）側の第２位置に向かって押動されるものであり、
前記外針基（２）は、前記逆止弁（３）が配設された位置よりも流出口（２２）側の内壁に、流入口（２１）側から該流出口（２２）側に向けて突出した傾斜した端面を有する突部（２ａ，２ｂ、２ｃ又は２ｄ）が設けられ、
前記逆止弁（３）は、前記押動によって、前記テーパ面（３１）のうち前記突部（２ａ，２ｂ、２ｃ又は２ｄ）の端面と対向する面及び該面側の側面が、該突部（２ａ，２ｂ、２ｃ又は２ｄ）の端面に当接し更に流出口（２２）側に向かって押し込まれることで、該突部（２ａ，２ｂ、２ｃ又は２ｄ）によって径方向に押圧され、該突部（２ａ，２ｂ、２ｃ又は２ｄ）の端面に沿うように変形するとともに、逆止弁（３）全体が、該突部（２ａ，２ｂ、２ｃ又は２ｄ）と外針基（２）の内壁とに挟まれることで径方向断面がＵ字状に変形し、前記逆止弁（３）の外周側に液体の流路を形成することを特徴とする留置針（１）。 One end of the male luer part (4) of the infusion side connector is inserted, and has a cylindrical shape having an inlet (21) through which liquid flows in through the male luer part (4) and an outlet (22) through which the liquid flows out. The outer needle base (2) of
A check valve (3) that is disposed inside the outer needle base (2) and is formed of an elastic body that prevents the liquid from flowing back from the outlet (22) to the inlet (21). a comprises Ru indwelling needle (1),
The check valve (3) is formed in a cylindrical shape so that the outer wall is in close contact with the inner wall of the outer needle base (2), and the cylindrical inner diameter of the end on the inlet (21) side is the male luer part. The outer needle base (2) is provided with a tapered surface (31) having a tapered shape at the end on the outflow port (22) side, which is formed smaller than the outer diameter of one end inserted in (4). One end of the inserted male luer part (4) is further pushed from the state in contact with the end on the side of the inflow port (21), whereby the inflow port (21) in a state in which the back flow of the liquid is prevented. From the first position on the side toward the second position on the outlet (22) side,
The outer needle base (2) is directed to the inner wall on the outlet (22) side from the position where the check valve (3) is disposed, and from the inlet (21) side to the outlet (22) side. A protrusion (2a, 2b, 2c or 2d) having an inclined end surface protruding in
When the check valve (3) is pushed, the surface of the tapered surface (31) facing the end surface of the protrusion (2a, 2b, 2c or 2d) and the side surface on the surface side are By abutting against the end face of the portion (2a, 2b, 2c or 2d) and further being pushed toward the outlet (22) side, the projection (2a, 2b, 2c or 2d) is pressed in the radial direction, While deforming along the end face of the protrusion (2a, 2b, 2c or 2d), the entire check valve (3) is formed between the protrusion (2a, 2b, 2c or 2d) and the outer needle base (2). indwelling needle radial section by being sandwiched between the inner wall is deformed into a U-shape, and wherein the Turkey to form a flow path of liquid on the outer peripheral side of the check valve (3) (1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07113390B2 (en) | 1987-04-27 | 1995-12-06 | 日本発条株式会社 | FRP leaf spring and manufacturing method thereof |
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| AU2013392518B2 (en) * | 2013-06-14 | 2017-08-10 | Nantong Hengtai Medical Apparatus Co., Ltd. | Multifunctional indwelling needle |
| GB201615219D0 (en) | 2016-09-07 | 2016-10-19 | Vascutek Ltd And Univ Medical Center Hamburg-Eppendorf (Uke) | Hybrid prosthesis and delivery system |
| GB201715658D0 (en) * | 2017-09-27 | 2017-11-08 | Vascutek Ltd | An endoluminal device |
| DE102018103937A1 (en) * | 2018-02-21 | 2019-08-22 | Fresenius Medical Care Deutschland Gmbh | Device containing dialysis solution or dialysis solution concentrate |
| GB201820898D0 (en) | 2018-12-20 | 2019-02-06 | Vascutek Ltd | Stent device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07113390B2 (en) | 1987-04-27 | 1995-12-06 | 日本発条株式会社 | FRP leaf spring and manufacturing method thereof |
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