JP2007151751A

JP2007151751A - Indwelling needle

Info

Publication number: JP2007151751A
Application number: JP2005349710A
Authority: JP
Inventors: Shigeteru Tanaka; 繁輝田中; Yoshiharu Iwase; 芳治岩瀬
Original assignee: Nipro Corp
Current assignee: Nipro Corp
Priority date: 2005-12-02
Filing date: 2005-12-02
Publication date: 2007-06-21
Anticipated expiration: 2025-12-02
Also published as: JP4736041B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indwelling needle where a length of a part coming into contact with a patient can be shortened in a used state. <P>SOLUTION: The indwelling needle 1 is composed of: a cylindrical body 3; a needle 4 with a blade tip 4a formed at a distal end; a cylindrical hub 5 which holds the rear end of the needle 4 and moves forward and backward along the body 3; a protection cover 6 which moves forward and backward along the body 3 and projects to the left shown in the figure from the body 3; and a spring 7 mounted elastically between the hub 5 and the protection cover 6. A first engagement part 11b of an operation lever 11 provided to the body is engaged to a first protrusion 6a of the protection cover and a second through-hole 22b of the hub to hold the indwelling needle in a using state by a first holding mechanism A. When the first engagement part is moved up to release the first holding mechanism, the protection cover and the hub are separated from each other by elastic force of the spring, and the protection cover and the hub are held in a housed state respectively by second and third holding mechanisms B and C. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は留置針に関し、具体的には収納状態において針を保護カバー内に収納する留置針に関する。 The present invention relates to an indwelling needle, and more particularly to an indwelling needle that stores a needle in a protective cover in a stored state.

今日、点滴や透析等のため、患者に留置針を穿刺することが行われており、その際患者から抜いた留置針が医療従事者に誤って刺さる事故を防止する必要がある。
このため、先端に刃先が形成された針と、該針の後端を保持する円筒状のハブと、上記針に沿って進退動可能に設けられた円筒状の保護カバーとを備えた留置針が知られている。（特許文献１〜３）
特許文献１の留置針は、カヌラの後端を保持するハブと、該ハブをその内部に収納して保持する保持筒とから構成され、保持筒を進退動させることで該保持筒内にカヌラを収納するようになっている。
特許文献２の留置針は、針カニューレの後端に設けられたハブと、該ハブを摺動可能に収納する安全シールドとから構成され、使用状態からアクチュエータを操作すると、ハブと安全シールドとの間に弾装されたばねが進展し、安全シールドが針カニューレを収納するようになっている。
特許文献３の留置針は、針カニューレおよび針ハブによって構成された針アセンブリと、該針アセンブリを進退動可能に収納する胴部とから構成され、医療処置が終了したら作動ボタンを操作することにより、ばねの弾性力により突き刺し要素を胴部に入れるようになっている。
このように、特許文献１〜３の留置針によれば、使用後には針を保護カバー内に収納する収納状態とすることで、上記事故を防止するようになっている。
特開平１０−８５３３３号公報特開２００２−３３０９４５号公報特開２００３−１８０８２９号公報 Today, it is necessary to puncture a patient with an indwelling needle for infusion, dialysis, and the like, and it is necessary to prevent an accident in which the indwelling needle removed from the patient is accidentally pierced by a medical worker.
For this reason, an indwelling needle comprising a needle having a cutting edge formed at the tip, a cylindrical hub that holds the rear end of the needle, and a cylindrical protective cover that can be moved forward and backward along the needle. It has been known. (Patent Documents 1 to 3)
The indwelling needle of Patent Document 1 is composed of a hub that holds the rear end of the cannula and a holding cylinder that holds and holds the hub therein, and the cannula is moved into the holding cylinder by moving the holding cylinder forward and backward. It comes to store.
The indwelling needle of Patent Document 2 is composed of a hub provided at the rear end of the needle cannula and a safety shield that slidably accommodates the hub, and when the actuator is operated from the state of use, the hub and the safety shield A spring loaded in between is advanced so that the safety shield houses the needle cannula.
The indwelling needle of Patent Document 3 is composed of a needle assembly constituted by a needle cannula and a needle hub, and a body part that accommodates the needle assembly so as to be able to move forward and backward, and by operating an operation button when a medical procedure is completed. The piercing element is inserted into the body by the elastic force of the spring.
As described above, according to the indwelling needles of Patent Documents 1 to 3, the accident is prevented by setting the needle in the protective cover after use.
JP 10-85333 A JP 2002-330945 A JP 2003-180829 A

しかしながら、上記特許文献１〜３の留置針の場合、上記保護カバーの長さを針が保護カバーから突出している長さよりも長く設定する必要があり、使用状態において患者に固定される部材の長さを長くせざるを得なかった。
その場合、たとえば透析治療を受けている患者の場合、何度も針を穿刺することで穿刺された部分の組織が硬化し、こぶ状の隆起ができてしまうが、使用状態において患者に固定される部材の長さが長いと、留置針を患者に固定した際に留置針が隆起に触れてしまい、血管に挿入される針の角度がぶれて患者が痛みを訴える場合があった。
このような問題に鑑み、本発明は使用状態において被装着体に固定される部材の長さの短い留置針を提供するものである。 However, in the case of the indwelling needles of Patent Documents 1 to 3, it is necessary to set the length of the protective cover longer than the length of the needle protruding from the protective cover, and the length of the member fixed to the patient in use. I had to make it long.
In that case, for example, in the case of a patient undergoing dialysis treatment, the tissue of the punctured portion is cured by puncturing the needle many times, and a knurled bulge can be formed, but it is fixed to the patient in use. If the length of the member is long, the indwelling needle touches the protuberance when the indwelling needle is fixed to the patient, and the patient may complain of pain because the angle of the needle inserted into the blood vessel is blurred.
In view of such a problem, the present invention provides an indwelling needle having a short length of a member fixed to a mounted body in use.

すなわち請求項１における留置針は、先端に刃先の形成された針と、該針を保持する筒状のハブと、上記針を囲繞するとともに該針に沿って摺動可能に設けられた筒状の保護カバーとを備え、
上記保護カバーを針の後端側に相対移動させて針の刃先を保護カバーより突出させる使用状態と、上記保護カバーを針の先端側に相対移動させて針の刃先を保護カバー内に収納する収納状態とに切替え可能な留置針において、
上記ハブおよび保護カバーを摺動可能に保持するとともに被装着体に固定される筒状の本体部と、上記ハブおよび保護カバーの間に弾装したばねと、上記ばねを圧縮して上記ハブおよび保護カバーを接近させ、上記使用状態を維持する作動レバーとを備え、
上記使用状態から上記作動レバーを操作することにより、上記ばねの弾性力により上記ハブおよび保護カバーを離隔する方向に相対移動させ、針の刃先を保護カバー内に収納して上記収納状態とすることを特徴としている。 That is, the indwelling needle according to claim 1 is a cylindrical shape provided with a needle having a cutting edge formed at the tip, a cylindrical hub for holding the needle, and surrounding the needle and slidable along the needle. With a protective cover,
The protective cover is moved relative to the rear end side of the needle so that the needle edge protrudes from the protective cover, and the protective cover is moved relative to the distal end side of the needle to store the needle edge in the protective cover. In the indwelling needle that can be switched to the storage state,
A cylindrical main body that holds the hub and the protective cover slidably and is fixed to the mounted body, a spring that is elastically mounted between the hub and the protective cover, and compresses the spring to compress the hub and And an operating lever that brings the protective cover closer and maintains the above-mentioned use state,
By operating the operating lever from the use state, the hub and the protective cover are relatively moved away from each other by the elastic force of the spring, and the needle edge of the needle is stored in the protective cover so as to be in the stored state. It is characterized by.

また請求項６における留置針は、先端に刃先の形成された針と、該針を保持する筒状のハブと、上記針を囲繞するとともに該針に沿って摺動可能に設けられた筒状の保護カバーとを備えた留置針において、
上記ハブおよび保護カバーを摺動自在に保持する筒状の本体部と、
本体部の後端側に設けられた上記ハブと先端側に設けられた保護カバーとの間に弾装され、該ハブ及び保護カバーをそれぞれ後端側および先端側に離隔する方向に付勢するばねと、
上記ばねを圧縮状態として、上記ハブ及び上記保護カバーを相互に接近させた状態に保持する第１保持機構と、
上記ばねを伸長状態として、本体部の先端側に相対移動した保護カバーを該本体部の先端側に保持する第２保持機構と、本体部の後端側に相対移動したハブを該本体部の後端側に保持する第３保持機構とを備えることを特徴としている。 The indwelling needle according to claim 6 is a cylindrical shape provided with a needle having a cutting edge formed at the tip, a cylindrical hub for holding the needle, a needle surrounding the needle and slidable along the needle. Indwelling needle with protective cover of
A cylindrical main body for slidably holding the hub and the protective cover;
It is elastically mounted between the hub provided on the rear end side of the main body and a protective cover provided on the front end side, and urges the hub and the protective cover in a direction to separate the rear end side and the front end side, respectively. Springs,
A first holding mechanism that holds the hub and the protective cover close to each other with the spring in a compressed state;
With the spring in an extended state, a second holding mechanism that holds the protective cover relatively moved to the front end side of the main body portion on the front end side of the main body portion, and a hub that is relatively moved to the rear end side of the main body portion And a third holding mechanism for holding on the rear end side.

上記請求項１の発明によれば、使用状態においては保護カバーとハブとを接近させているので、使用状態において被装着体に固定される部材の長さを短くすることができ、患者への負担を軽減することができる。
具体的に説明すると、上記保護カバーおよびハブは本体部によって摺動可能に保持されており、使用状態において上記ハブは本体部に対して保護カバー側に接近した位置に保持されている。
この状態から作動レバーを操作して留置針を収納状態とすると、ばねの弾性力によって上記ハブは本体部から離隔する方向に相対移動し、このハブと本体部とが相対移動した距離だけ、患者に接触する部材の長さが長くなる。
換言すれば、針を突出させて患者に穿刺を行う使用状態においては、上記ハブと本体部との相対移動の距離だけ患者に接触する部材の長さを短くすることができ、皮膚にできた隆起を避けて留置針を固定することが可能となるので、患者への負担を軽減することができる。 According to the first aspect of the present invention, since the protective cover and the hub are brought close to each other in the use state, the length of the member fixed to the mounted body in the use state can be shortened. The burden can be reduced.
More specifically, the protective cover and the hub are slidably held by the main body, and in use, the hub is held at a position close to the protective cover with respect to the main body.
When the operating lever is operated from this state to place the indwelling needle in the retracted state, the hub is relatively moved away from the main body by the elastic force of the spring, and the patient is moved by the distance that the hub and the main body are relatively moved. The length of the member that contacts is increased.
In other words, in the state of use in which the patient is punctured by protruding the needle, the length of the member that contacts the patient can be shortened by the distance of relative movement between the hub and the main body, and the skin is made. Since the indwelling needle can be fixed while avoiding the bulge, the burden on the patient can be reduced.

上記請求項６の発明によれば、ばねの弾性力に抗して保護カバーとハブとを接近させて第１保持機構により保持しているので、使用状態において被装着体に固定される部材の長さを短くすることができ、患者への負担を軽減することができる。
具体的に説明すると、上記保護カバーおよびハブは本体部によって摺動可能に保持されており、使用状態において上記ハブは本体部に対して保護カバー側に接近した位置に保持されている。
この状態から第１保持機構を解除して留置針を収納状態とすると、ばねの弾性力によって上記ハブは本体部に対して後端側に相対移動し、このハブと本体部とが相対移動した距離だけ、患者に接触する部材の長さが長くなる。
換言すれば、針を突出させて患者に穿刺を行う使用状態においては、上記ハブと本体部との相対移動の距離だけ患者に接触する部材の長さを短くすることができ、皮膚にできた隆起を避けて留置針を固定することが可能となるので、患者への負担を軽減することができる。 According to the sixth aspect of the present invention, since the protective cover and the hub are brought close to each other against the elastic force of the spring and are held by the first holding mechanism, the member fixed to the mounted body in the use state is provided. The length can be shortened and the burden on the patient can be reduced.
More specifically, the protective cover and the hub are slidably held by the main body, and in use, the hub is held at a position close to the protective cover with respect to the main body.
When the first holding mechanism is released from this state to place the indwelling needle in the retracted state, the hub moves relative to the rear end side relative to the main body due to the elastic force of the spring, and the hub and the main body move relative to each other. The length of the member that contacts the patient is increased by the distance.
In other words, in the state of use in which the patient is punctured by protruding the needle, the length of the member that contacts the patient can be shortened by the distance of relative movement between the hub and the main body, and the skin is made. Since the indwelling needle can be fixed while avoiding the bulge, the burden on the patient can be reduced.

以下本実施例について説明すると、図１、図２は本発明に係る留置針１を示し、このうち図１は留置針１の使用状態の断面図を、図２は収納状態の断面図を表すとともに、図１（ａ）、図２（ａ）は側面方向からの断面図を、図１（ｂ）、図２（ｂ）は平面方向からの断面図を表している。なお、以下の説明において、下記針４の刃先４ａ側を先端側とする。
本実施例の留置針１は、被装着体としての患者に固定される翼状部材２と、該翼状部材２を介して患者に固定される円筒状の本体部３と、先端に刃先４ａの形成された中空の針４と、該針４の後端部を保持するとともに上記本体部３の後端側で摺動する筒状のハブ５と、上記本体部３の先端側で摺動する筒状の保護カバー６と、上記ハブ５および保護カバー６の間に弾装されたばね７とから構成されている。
上記留置針１の使用状態とは、上記針４が本体部３の先端より突出し、かつ保護カバー６が本体部３内に収容されている状態のことをいい、この使用状態では、針４の刃先４ａを患者に穿刺し、粘着テープ等により上記翼状部材２ごと本体部３を患者に固定するようになっている。
一方、留置針１の収納状態とは、上記保護カバー６を本体部３より突出させて、該保護カバー６に針４を収納している状態のことをいい、患者への輸液等が終了したら保護カバー６に針４を収納することで、刃先４ａが医療従事者に刺さってしまう事故を防止するようになっている。
そして本実施例の留置針１には、上記本体部３、ハブ５、保護カバー６を上記使用状態に維持する第１保持機構Ａと、上記本体部３と保護カバー６とを収納状態に維持する第２保持機構Ｂと、本体部３とハブ５とを収納状態に維持する第３保持機構Ｃとが備えられている。 1 and 2 show an indwelling needle 1 according to the present invention, in which FIG. 1 shows a sectional view of the indwelling needle 1 in use, and FIG. 2 shows a sectional view of a stored state. In addition, FIGS. 1A and 2A are cross-sectional views from the side surface direction, and FIGS. 1B and 2B are cross-sectional views from the plane direction. In the following description, the cutting edge 4a side of the following needle 4 is the tip side.
The indwelling needle 1 of the present embodiment has a wing-like member 2 fixed to a patient as a mounted body, a cylindrical main body 3 fixed to the patient via the wing-like member 2, and a blade edge 4a formed at the tip. A hollow needle 4, a cylindrical hub 5 that holds the rear end portion of the needle 4 and slides on the rear end side of the main body portion 3, and a cylinder that slides on the front end side of the main body portion 3. And a spring 7 elastically mounted between the hub 5 and the protective cover 6.
The use state of the indwelling needle 1 means a state in which the needle 4 protrudes from the tip of the main body 3 and the protective cover 6 is accommodated in the main body 3. The blade tip 4a is punctured into the patient, and the main body 3 is fixed to the patient together with the wing member 2 by an adhesive tape or the like.
On the other hand, the storage state of the indwelling needle 1 refers to a state in which the protective cover 6 protrudes from the main body 3 and the needle 4 is stored in the protective cover 6, and when the infusion to the patient is completed. By storing the needle 4 in the protective cover 6, an accident in which the cutting edge 4 a is stuck in the medical staff is prevented.
In the indwelling needle 1 of the present embodiment, the first holding mechanism A that maintains the main body 3, the hub 5, and the protective cover 6 in the use state, and the main body 3 and the protective cover 6 are maintained in the stored state. And a third holding mechanism C that maintains the main body 3 and the hub 5 in the housed state.

上記翼状部材２は、本体部３を囲繞する筒状部２ａと、該筒状部２ａの両側に広がる翼部２ｂとから構成され、筒状部２ａの上方（図１（ａ）の上方）には回転防止のための溝２ｃが形成されている。
そして上記翼部２ｂを患者の皮膚に沿って変形させ、翼状部材２の表面から粘着テープ等によって固定することで、留置針１を患者に固定するようになっている。 The wing-like member 2 is composed of a cylindrical portion 2a surrounding the main body portion 3 and wing portions 2b spreading on both sides of the cylindrical portion 2a, and above the cylindrical portion 2a (above FIG. 1 (a)). Is formed with a groove 2c for preventing rotation.
And the indwelling needle 1 is fixed to a patient by deform | transforming the said wing | blade part 2b along a patient's skin, and fixing with the adhesive tape etc. from the surface of the wing-like member 2. FIG.

上記本体部３は略円筒形を有し、その外周面には上記翼状部材２の筒状部２ａが嵌合する連結部３ａと、該連結部３ａの後端側に位置する大径部３ｂと、大径部３ｂの後端側に位置して上記ハブ５の嵌合する小径部３ｃとが形成され、上記大径部３ｂには作動レバー１１が設けられている。
上記連結部３ａは上記翼状部材２の筒状部２ａの内径に合わせて製造され、該連結部３ａの上方には上記筒状部２ａの溝２ｃに嵌合する凸形状３ｄを形成して、翼状部材２と本体部３とが相対的に回転するのを防止している。
次に、上記大径部３ｂと小径部３ｃとの境界には段差３ｅが形成され、さらに大径部３ｂの上方には図示左右方向にキー溝１２（図２（ａ）参照）が形成されている。
小径部３ｃはハブ５の内周面に沿って摺動可能な径で製造され、上部には所定位置には第１貫通孔１３が、両側部には図示左右方向には第１ガイド孔１４がそれぞれ穿設されている。そして該第１ガイド孔１４の後端には第４係合部１５が形成されている。
また本体部３の内周面３ｆの上部には、先端から後端にかけて第１ガイド溝１６が形成され、該第１ガイド溝１６の先端部には内周方向に突出する第２係合部１６ａが形成されている。
さらに、内周面３ｆの下部には先端から後端にかけて第２ガイド溝１７が形成され、該第２ガイド溝１７には上記第２係合部１６ａよりも後端側の位置に第３係合部１７ａが形成されている。この第３係合部１７ａの後端部には傾斜面が形成されている。
上記作動レバー１１は、上記大径部３ｂに先端が固定された腕部１１ａと、該腕部１１ａの後端側に設けられるとともに上記第１貫通孔１３を貫通するように設けられた第１係合部１１ｂと、第１係合部１１ｂよりも後端側に設けられたつまみ１１ｃとから構成されている。
上記腕部１１ａは弾性変形し、通常は上記第１係合部１１ｂが上記第１貫通孔１３内に収納される状態を維持している。そして上記つまみ１１ｃを上方に持ち上げて腕部１１ａを弾性変形させると、上記第１係合部１１ｂを第１貫通孔１３より離脱させることが可能となっている The main body 3 has a substantially cylindrical shape, and a connecting portion 3a on which the cylindrical portion 2a of the wing-like member 2 is fitted on the outer peripheral surface, and a large-diameter portion 3b located on the rear end side of the connecting portion 3a. And a small-diameter portion 3c, which is located on the rear end side of the large-diameter portion 3b and into which the hub 5 is fitted, is formed, and an operating lever 11 is provided in the large-diameter portion 3b.
The connecting portion 3a is manufactured according to the inner diameter of the tubular portion 2a of the wing-like member 2, and a convex shape 3d that fits into the groove 2c of the tubular portion 2a is formed above the connecting portion 3a. The wing-like member 2 and the main body 3 are prevented from rotating relatively.
Next, a step 3e is formed at the boundary between the large-diameter portion 3b and the small-diameter portion 3c, and a key groove 12 (see FIG. 2A) is formed above the large-diameter portion 3b in the horizontal direction in the figure. ing.
The small-diameter portion 3c is manufactured with a diameter that can slide along the inner peripheral surface of the hub 5. The upper portion has a first through hole 13 at a predetermined position in the upper portion and the first guide hole 14 in the left-right direction in both sides. Are respectively drilled. A fourth engagement portion 15 is formed at the rear end of the first guide hole 14.
A first guide groove 16 is formed at the upper part of the inner peripheral surface 3f of the main body part 3 from the front end to the rear end, and the second engagement part protrudes in the inner peripheral direction at the front end part of the first guide groove 16. 16a is formed.
Further, a second guide groove 17 is formed in the lower part of the inner peripheral surface 3f from the front end to the rear end. The second guide groove 17 has a third engagement at a position on the rear end side with respect to the second engagement portion 16a. A joint portion 17a is formed. An inclined surface is formed at the rear end of the third engaging portion 17a.
The operating lever 11 is provided on the rear end side of the arm portion 11a whose tip is fixed to the large-diameter portion 3b and the first through-hole 13 while being provided on the rear end side of the arm portion 11a. It is comprised from the engaging part 11b and the knob 11c provided in the back end side rather than the 1st engaging part 11b.
The arm portion 11a is elastically deformed and normally maintains the state in which the first engagement portion 11b is housed in the first through hole 13. When the knob 11c is lifted upward to elastically deform the arm portion 11a, the first engaging portion 11b can be detached from the first through hole 13.

上記ハブ５は上記針４の後端部を保持する保持部５ａと、上記本体部３を収納する円筒部５ｂと、図示しない輸液チューブの連結される連結部５ｃとから構成され、保持部５ａと円筒部５ｂとの間には環状溝５ｄが形成されている。
上記保持部５ａは針４の後端部を嵌着保持し、該針４を囲繞するように設けられたばね７の後端と当接するばね受け部を形成している。
さらに、保持部５ａと連結部５ｃとの間には液体通路５ｅが形成され、輸液チューブを介して流入する輸液は該液体通路５ｅより針４に供給される。
上記円筒部５ｂの上部には、上記本体部３のキー溝１２に係合するキー形状２１が先端側に向けて突出し、該キー形状２１の後端側には第２貫通孔２２が穿設されている。
上記図１（ａ）に示す使用状態において、上記第２貫通孔２２は上記本体部３の第１貫通孔１３と重合し、作動レバー１１の第１係合部１１ｂが挿入されるようになっている。
円筒部５ｂの両側には、その先端部に内周に向けて突出する第３突起２３が形成され、該第３突起２３は上記本体部３の第１ガイド孔１４に沿って移動するとともに、ハブ５と本体部３とが相対的に回転するのを防止している。 The hub 5 includes a holding portion 5a for holding the rear end portion of the needle 4, a cylindrical portion 5b for storing the main body portion 3, and a connecting portion 5c to which an infusion tube (not shown) is connected. An annular groove 5d is formed between the cylindrical portion 5b and the cylindrical portion 5b.
The holding portion 5 a is fitted and held at the rear end portion of the needle 4 and forms a spring receiving portion that comes into contact with the rear end of the spring 7 provided so as to surround the needle 4.
Further, a liquid passage 5e is formed between the holding portion 5a and the connecting portion 5c, and the infusion fluid flowing in via the infusion tube is supplied to the needle 4 from the liquid passage 5e.
A key shape 21 that engages with the key groove 12 of the main body portion 3 protrudes toward the front end side of the cylindrical portion 5b, and a second through hole 22 is formed at the rear end side of the key shape 21. Has been.
In the use state shown in FIG. 1A, the second through hole 22 overlaps with the first through hole 13 of the main body 3, and the first engaging portion 11b of the operating lever 11 is inserted. ing.
On both sides of the cylindrical portion 5b, a third protrusion 23 protruding toward the inner periphery is formed at the tip, and the third protrusion 23 moves along the first guide hole 14 of the main body 3, and The hub 5 and the main body 3 are prevented from rotating relatively.

次に、上記保護カバー６は、その先端が使用状態において本体部３の先端と同じ位置となるよう、本体部３の内周面３ｆ内に摺動可能に収納されている。
保護カバー６の上部には上記本体部３の第１ガイド溝１６に沿って移動する第１突起６ａが形成され、また保護カバー６の下部には上記本体部３の第２ガイド溝１７に沿って移動する第２突起６ｂが形成されている。
上記第２突起６ｂは先端側から後端側に向けて傾斜した形状を有し、上記第２ガイド溝１７に形成された第３係合部１７ａの傾斜面に接触すると、保護カバー６の内周に向けて弾性変形し、第３係合部１７ａを乗り越えると復帰して、再び保護カバー６の外周に向けて突出するようになっている。
そして第１、第２突起６ａ、６ｂをそれぞれ第１、第２ガイド溝１６、１７に係合させることで、保護カバー６と本体部３とが相対的に回転するのを防止している。 Next, the protective cover 6 is slidably accommodated in the inner peripheral surface 3f of the main body 3 so that the front end of the protective cover 6 is in the same position as the front end of the main body 3 in use.
A first protrusion 6 a that moves along the first guide groove 16 of the main body 3 is formed on the upper portion of the protective cover 6, and along the second guide groove 17 of the main body 3 on the lower portion of the protective cover 6. A second protrusion 6b is formed.
The second protrusion 6b has a shape inclined from the front end side toward the rear end side, and comes into contact with the inclined surface of the third engagement portion 17a formed in the second guide groove 17 so that the inside of the protective cover 6 It is elastically deformed toward the periphery, returns when it gets over the third engaging portion 17a, and protrudes toward the outer periphery of the protective cover 6 again.
The first and second protrusions 6a and 6b are engaged with the first and second guide grooves 16 and 17, respectively, to prevent the protective cover 6 and the main body 3 from rotating relatively.

上記留置針１を使用状態に維持する第１保持機構Ａについて説明すると、図１において、ハブ５および保護カバー６は上記ばね７の弾性力に抗して接近した状態に保持されている。
この状態において、上記ハブ５は本体部３に対して最も先端側に位置しており、円筒部５ｂの先端は上記本体部３の段差３ｅに当接し、また上記本体部３の後端はハブ５の環状溝５ｄに収納されている。
上記ハブ５に穿設された第２貫通孔２２には、上記作動レバー１１の第１係合部１１ｂが挿入され、該第１係合部１１ｂの先端側の端面と、第２貫通孔２２の先端側の端面とが係合することにより、ばね７の弾性力に抗してハブ５が後端側へ移動するのを規制している。
一方、保護カバー６は本体部に対して最も後端側に位置しており、このとき保護カバー６の先端と本体部３の先端との位置は略一致し、さらに上記第１突起６ａは作動レバー１１の第１係合部１１ｂよりも後端側に位置している。
そして、第１突起６ａの先端側の端面と第１係合部１１ｂの後端側の端面とが係合することにより、ばね７の弾性力に抗して保護カバー６が先端側へ移動するのを規制している。
このように、作動レバー１１の第１係合部１１ｂに上記ハブ５の第２貫通孔２２と、保護カバー６の第１突起６ａとを係合させることで、留置針１を使用状態に維持することができる。 The first holding mechanism A that keeps the indwelling needle 1 in use will be described. In FIG. 1, the hub 5 and the protective cover 6 are held close to each other against the elastic force of the spring 7.
In this state, the hub 5 is located on the most distal side with respect to the main body 3, the front end of the cylindrical portion 5b abuts on the step 3e of the main body 3, and the rear end of the main body 3 is the hub. 5 is accommodated in the annular groove 5d.
The first engagement portion 11b of the operating lever 11 is inserted into the second through hole 22 formed in the hub 5, and the end surface on the distal end side of the first engagement portion 11b and the second through hole 22 are inserted. By engaging with the end face on the front end side, the hub 5 is restrained from moving toward the rear end side against the elastic force of the spring 7.
On the other hand, the protective cover 6 is located on the most rear end side with respect to the main body portion. At this time, the positions of the front end of the protective cover 6 and the front end of the main body portion 3 substantially coincide with each other, and the first protrusion 6a operates. The lever 11 is positioned on the rear end side with respect to the first engaging portion 11b.
Then, the end face on the front end side of the first protrusion 6a and the end face on the rear end side of the first engaging portion 11b are engaged, so that the protective cover 6 moves to the front end side against the elastic force of the spring 7. Is regulated.
Thus, the indwelling needle 1 is maintained in use by engaging the second through hole 22 of the hub 5 and the first protrusion 6a of the protective cover 6 with the first engaging portion 11b of the operating lever 11. can do.

次に、図２を用いて上記本体部３と保護カバー６とを収納状態に維持する第２保持機構Ｂについて説明すると、図１の使用状態から上記第１保持機構Ａを解除すると、上記ハブ５および保護カバー６はばね７の弾性力によって離隔する方向に付勢される。
保護カバー６は本体部３に対して先端側に相対移動し、上記第１突起６ａは本体部３の内周面３ｆに形成された第１ガイド溝１６に沿って移動する。
そして該第１突起６ａの先端側の端面と第１ガイド溝１６の第２係合部１６ａの後端側の端面とが係合することにより、保護カバー６が先端側に移動するのを規制し、本体部３より脱落しないようにしている。
一方、保護カバー６が本体部３に対して先端側に相対移動すると、上記第２突起６ｂも本体部３の第２ガイド溝１７に沿って移動し、この第２突起６ｂが上記第３係合部１７ａの傾斜面に接触すると、保護カバー６の内側に弾性変形し、その後第３係合部１７ａを超えると元の形状に復帰する。
これにより、第２突起６ｂの後端側の端面と第３係合部１７ａの先端側の端面とが係合することになり、保護カバー６が後端側に相対移動するのを規制し、使用状態に戻らないようにしている。
このように、保護カバー６に形成された第１突起６ａおよび第２突起６ｂを、本体部３に形成された第２、第３係合部１６ａ、１７ａに係合させることで、保護カバー６と本体部３との収納状態を維持することができる。 Next, the second holding mechanism B that maintains the main body 3 and the protective cover 6 in the housed state will be described with reference to FIG. 2. When the first holding mechanism A is released from the use state of FIG. 5 and the protective cover 6 are urged in a direction away from each other by the elastic force of the spring 7.
The protective cover 6 moves relative to the front end side with respect to the main body 3, and the first protrusion 6 a moves along the first guide groove 16 formed on the inner peripheral surface 3 f of the main body 3.
Then, when the end surface on the front end side of the first protrusion 6a and the end surface on the rear end side of the second engagement portion 16a of the first guide groove 16 are engaged, the movement of the protective cover 6 to the front end side is restricted. The main body 3 is prevented from falling off.
On the other hand, when the protective cover 6 moves relative to the front end side with respect to the main body 3, the second protrusion 6 b also moves along the second guide groove 17 of the main body 3, and the second protrusion 6 b moves to the third engagement. When it contacts the inclined surface of the joint portion 17a, it is elastically deformed inside the protective cover 6, and then returns to its original shape when it exceeds the third engaging portion 17a.
Thereby, the end surface on the rear end side of the second protrusion 6b and the end surface on the front end side of the third engagement portion 17a are engaged, and the relative movement of the protective cover 6 to the rear end side is restricted, We are trying not to return to use.
As described above, the first protrusion 6 a and the second protrusion 6 b formed on the protective cover 6 are engaged with the second and third engaging portions 16 a and 17 a formed on the main body 3, so that the protective cover 6 And the main body part 3 can be maintained.

そして本体部３とハブ５とを収納状態に維持する第３保持機構Ｃについて説明すると、図１の使用状態から上記第１保持機構Ａを解除すると、上記ハブ５および保護カバー６はばね７の弾性力によって離隔する方向に付勢される。
ハブ５は本体部３に対して後端側に相対移動し、円筒部３ｂの第３突起２３は本体部３の第１ガイド孔１４に沿って移動する。そして第３突起２３の後端側の端面と第１ガイド孔１４の後端に位置する第４係合部１５の先端側の端面とが係合することにより、ハブ５が後端側に移動するのを規制して、ハブ５が本体部３より脱落しないようにしている。
一方、上記ハブ５がばね７によって後端側に相対移動すると、上記作動レバー１１の第１係合部１１ｂは再び本体部３の第１貫通孔１３内に収納されるようになっている。
このとき、第１係合部１１ｂの後端側の端面と、ハブ５のキー形状２１の先端側の端面とが係合することにより、ハブ５が先端側に移動するのが規制され、使用状態に戻らないようにしている。
このように、ハブ５の第３突起２３を本体部３の第４係合部１５に係合させ、かつ作動レバー１１の第１係合部１１ｂにハブ５のキー形状２１の先端を当接させることで、ハブ５と本体部３との収納状態を維持することができる。 The third holding mechanism C that maintains the main body 3 and the hub 5 in the housed state will be described. When the first holding mechanism A is released from the use state of FIG. It is urged in the direction away by the elastic force.
The hub 5 moves relative to the rear end side with respect to the main body 3, and the third protrusion 23 of the cylindrical portion 3 b moves along the first guide hole 14 of the main body 3. Then, the end surface on the rear end side of the third protrusion 23 and the end surface on the front end side of the fourth engagement portion 15 located at the rear end of the first guide hole 14 are engaged, whereby the hub 5 moves to the rear end side. The hub 5 is prevented from falling off from the main body 3.
On the other hand, when the hub 5 is relatively moved to the rear end side by the spring 7, the first engaging portion 11 b of the operating lever 11 is again accommodated in the first through hole 13 of the main body portion 3.
At this time, the end surface on the rear end side of the first engaging portion 11b and the end surface on the front end side of the key shape 21 of the hub 5 are engaged, so that the hub 5 is restricted from moving to the front end side. I try not to return to the state.
In this way, the third protrusion 23 of the hub 5 is engaged with the fourth engaging portion 15 of the main body 3, and the tip of the key shape 21 of the hub 5 is brought into contact with the first engaging portion 11 b of the operating lever 11. By doing so, the accommodation state of the hub 5 and the main-body part 3 can be maintained.

以上の構成を有する本実施例の留置針１の使用方法について説明する。
最初に、留置針１は上記使用状態で使用されるようになっており、ハブ５の連結部５ｃにはあらかじめ輸液チューブが接続され、また針４を患者に穿刺するまでは、針４の外周を図示しないカバーによって覆うようになっている。
次に、上記カバーを取り外して上記針４を患者の血管に穿刺し、翼状部材２を患者の皮膚に沿って変形させたら、該翼状部材２をテープ等によって患者に固定し、留置針１が患者に固定される。
その後、輸液チューブからの輸液はハブ５に形成された液体通路５ｅおよび針４を介して患者に送液され、輸液が終了したら、最初に翼状部材２を固定していたテープをはずし、針を患者から抜かずに、上記作動レバー１１のつまみ１１ｃを持ち上げる。
すると、上記作動レバー１１の腕部１１ａが弾性変形して、第１係合部１１ｂが本体部３の第１貫通孔１３およびハブ５の第２貫通孔２２より離脱し、上記使用状態を維持する第１保持機構Ａが解除される。 A method of using the indwelling needle 1 of the present embodiment having the above configuration will be described.
First, the indwelling needle 1 is used in the above-described use state, and an infusion tube is connected to the connecting portion 5c of the hub 5 in advance, and the outer periphery of the needle 4 until the needle 4 is punctured into the patient. Is covered with a cover (not shown).
Next, the cover 4 is removed, the needle 4 is punctured into the patient's blood vessel, and the wing-like member 2 is deformed along the patient's skin. Then, the wing-like member 2 is fixed to the patient with a tape or the like. Fixed to the patient.
Thereafter, the infusion from the infusion tube is sent to the patient via the liquid passage 5e formed in the hub 5 and the needle 4, and when the infusion is completed, the tape that first fixed the wing member 2 is removed, and the needle is removed. The knob 11c of the operating lever 11 is lifted without removing it from the patient.
Then, the arm portion 11a of the operating lever 11 is elastically deformed, and the first engaging portion 11b is detached from the first through hole 13 of the main body portion 3 and the second through hole 22 of the hub 5 to maintain the use state. The first holding mechanism A is released.

上記第１保持機構Ａが解除されると、ばね７の弾性力によってハブ５と保護カバー６とはそれぞれ離隔する方向に相対移動し、上記作動レバー１１の腕部１１ａは弾性変形したまま、上記第１係合部１１ｂは上記ハブ５のキー形状２１の表面を摺動する。
ハブ５はばね７の弾性力によって本体部３に対して後端側に相対移動し、これにより針４も本体部３に対して後端側に相対移動するので、針４が患者の血管より引き抜かれる。なお、このとき必ずしも針４が完全に血管より引き抜かれる必要はない。
そしてハブ５が本体部３に対して最も後端に相対移動すると、上記腕部１１ａが弾性変形より復帰し、第１係合部１１ｂが第１貫通孔１３内に収納される。
その結果、第１係合部１１ｂとハブ５のキー形状２１とが係合し、同時に第３突起２３と本体部３の第４係合部１５とが係合するので、ハブ５及び本体部３は上記第３保持機構Ｃによって収納状態に維持される。
一方、保護カバー６はばね７の弾性力によって本体部３に対して先端側に相対移動し、本体部３に対して最も先端に相対移動すると、保護カバー６の第１突起６ａと本体部３の第１ガイド溝１６に形成された第２係合部１６ａとが係合し、同時に第２突起６ｂと第２ガイド溝１７に形成された第３係合部１７ａとが係合する。
これにより、保護カバー６内に針４の刃先４ａが収納され、保護カ保護カバー６及び本体部３は上記第２保持機構Ｂによって収納状態に維持される。 When the first holding mechanism A is released, the hub 5 and the protective cover 6 are moved relative to each other by the elastic force of the spring 7, and the arm 11a of the operating lever 11 remains elastically deformed. The first engaging portion 11 b slides on the surface of the key shape 21 of the hub 5.
The hub 5 is moved relative to the rear end side with respect to the main body portion 3 by the elastic force of the spring 7, whereby the needle 4 is also moved relative to the rear end side with respect to the main body portion 3. Pulled out. At this time, the needle 4 does not necessarily have to be completely extracted from the blood vessel.
When the hub 5 moves relative to the rear end most with respect to the main body 3, the arm portion 11 a is restored from elastic deformation, and the first engagement portion 11 b is accommodated in the first through hole 13.
As a result, the first engaging portion 11b and the key shape 21 of the hub 5 are engaged, and at the same time, the third protrusion 23 and the fourth engaging portion 15 of the main body 3 are engaged. 3 is maintained in the stored state by the third holding mechanism C.
On the other hand, when the protective cover 6 moves relative to the distal end side with respect to the main body 3 by the elastic force of the spring 7 and moves relative to the distal end relative to the main body 3, the first protrusion 6 a of the protective cover 6 and the main body 3. The second engaging portion 16a formed in the first guide groove 16 is engaged, and at the same time, the second protrusion 6b and the third engaging portion 17a formed in the second guide groove 17 are engaged.
As a result, the cutting edge 4a of the needle 4 is stored in the protective cover 6, and the protective cover 6 and the main body 3 are maintained in the stored state by the second holding mechanism B.

このような構成を有する本実施例の留置針１によれば、留置針１を使用状態から収納状態とすることで、針４が保護カバー６内に収納されるので、針４が誤って医療従事者に刺さる事故を防止することができる。
次に本実施例の留置針１によれば、使用状態において患者に接触する部材の長さを短くすることができる。
具体的には、使用状態においては本体部３に対してハブ５を先端側に位置させておくことにより、針４が本体部３の先端より突出する長さを長くすることができ、患者に接触する部分を本体部３及びハブ５の連結部５ｃだけとすることができる。
そして収納状態とすると、本体部３に対してハブ５が後端側に相対移動し、ハブの円筒部５ｂが本体部より露出するので、患者に接触する部分が長くなるが、この収納状態は留置針１を患者から取り除く短期間だけであり、患者に負担を与えることはない。
さらに本実施例の留置針１によれば、使用状態から収納状態とする際に、患者の血管を傷めてしまうのを防止することができ、また血液の飛散を防止することができる。
具体的には、使用状態から収納状態とすると、本体部３に対してハブ５が後端側に位置し、保護カバー６は本体部３に対して後端側に相対移動した針４を収納するように先端側に相対移動する。これにより本体部３より突出していた針４の一部が血管から引き抜かれ、その状態で保護カバー６内に針４が収納されるので、血管に負担を与えず、また血液を飛散しにくくすることができる。
これを従来の特許文献１〜３の留置針と比較すると、従来の留置針は保護カバーから突出していた針を一気に保護カバー内に収納していたため、血管が傷んでしまう場合があり、また針内の血液が飛散してしまう恐れがあった。 According to the indwelling needle 1 of the present embodiment having such a configuration, the needle 4 is stored in the protective cover 6 by changing the indwelling needle 1 from the use state to the storage state. Accidents that pierce workers can be prevented.
Next, according to the indwelling needle 1 of a present Example, the length of the member which contacts a patient in use condition can be shortened.
Specifically, when the hub 5 is positioned on the distal end side with respect to the main body portion 3 in use, the length of the needle 4 protruding from the front end of the main body portion 3 can be lengthened. Only the connecting portion 5c of the main body 3 and the hub 5 can be in contact.
In the storage state, the hub 5 moves relative to the main body portion 3 toward the rear end side, and the cylindrical portion 5b of the hub is exposed from the main body portion. It is only a short period of time for removing the indwelling needle 1 from the patient, and does not give a burden to the patient.
Furthermore, according to the indwelling needle 1 of the present embodiment, it is possible to prevent the patient's blood vessel from being damaged when changing from the use state to the storage state, and it is possible to prevent blood from being scattered.
Specifically, when the use state is changed to the storage state, the hub 5 is positioned on the rear end side with respect to the main body 3, and the protective cover 6 stores the needle 4 that has moved relative to the main body 3 toward the rear end. Move relative to the tip side. As a result, a part of the needle 4 protruding from the main body 3 is pulled out from the blood vessel, and the needle 4 is housed in the protective cover 6 in this state, so that the blood vessel is not burdened and blood is hardly scattered. be able to.
When this is compared with the indwelling needles of the conventional patent documents 1 to 3, the conventional indwelling needle has housed the needle protruding from the protective cover in the protective cover all at once, so that the blood vessel may be damaged. There was a risk that the blood inside would be scattered.

次に、以下図３、図４を用いて、本発明に係る第２実施例について説明する。本実施例は上記第１実施例とほぼ同様の構成を有しており、共通する機能を有する部材には第１実施例と同じ部材の名称を用いて説明する。
本実施例の留置針１は、患者に固定される翼状部材２と、該翼状部材２によって保持される円筒状の本体部３と、先端に刃先４ａの形成された中空の針４と、該針４の後端部を保持するとともに上記本体部３に沿って進退動する円筒状のハブ５と、上記本体部３に沿って進退動し本体部３より図示左方に突出可能に設けられた保護カバー６と、上記ハブ５および保護カバー６との間に弾装されたばね７とから構成されている。
そして留置針１は、上記本体部３、ハブ５、保護カバー６を使用状態に維持する第１保持機構Ａと、上記本体部３と保護カバー６とを収納状態に維持する第２保持機構Ｂと、本体部３とハブ５とを収納状態に維持する第３保持機構Ｃとを備えている。 Next, a second embodiment according to the present invention will be described below with reference to FIGS. This embodiment has substantially the same configuration as that of the first embodiment, and members having common functions will be described using the same member names as those of the first embodiment.
The indwelling needle 1 of the present embodiment includes a wing-like member 2 fixed to a patient, a cylindrical main body 3 held by the wing-like member 2, a hollow needle 4 having a cutting edge 4a formed at the tip, A cylindrical hub 5 that holds the rear end portion of the needle 4 and moves forward and backward along the main body portion 3, and moves forward and backward along the main body portion 3 so as to protrude leftward in the drawing from the main body portion 3. A protective cover 6 and a spring 7 elastically mounted between the hub 5 and the protective cover 6.
The indwelling needle 1 includes a first holding mechanism A that maintains the main body 3, the hub 5, and the protective cover 6 in a use state, and a second holding mechanism B that maintains the main body 3 and the protective cover 6 in a stored state. And a third holding mechanism C that maintains the main body 3 and the hub 5 in the housed state.

上記本体部３は、その使用状態では、その内部に上記ハブ５および保護カバー６を摺動可能に保持するようになっており、その外周面は上記翼状部材２の連結される連結部５ｃと、その後端側に形成された大径部３ｂとから構成され、大径部３ｂの上部には作動レバー１１が設けられている。
大径部３ｂの上部には、所定位置に第１貫通孔１３が穿設され、また大径部３ｂの後端側には、その一側部（図３（ｂ）下部）には内側に向けて第３突起２３が突出している。
本体部３の内周面には、先端側に形成されて上記保護カバー６を摺動可能に保持する小径部３ｇと、該小径部３ｇの後端側に形成されてハブ５を摺動可能に保持する大径部３ｈとが形成され、小径部３ｇと大径部３ｈとの境界には段差３ｅが形成されている。
また本体部３の内周面３ｆにおける一側部（図３（ｂ）上部）には、先端から後端にかけて第２係合部１６ａの形成された第１ガイド溝１６が形成され、また内周面３ｆの下部には先端から後端にかけて第３係合部１７ａの形成された第２ガイド溝１７が形成されている。
そして作動レバー１１は腕部１１ａ、第１係合部１１ｂ、つまみ１１ｃを備えており、上記第１係合部１１ｂは上記第１貫通孔１３を貫通するようになっている。 When the main body 3 is in use, the hub 5 and the protective cover 6 are slidably held therein, and an outer peripheral surface of the main body 3 is connected to a connecting portion 5c to which the wing member 2 is connected. The large-diameter portion 3b formed on the rear end side of the large-diameter portion 3b is provided with an actuating lever 11 at the top.
A first through hole 13 is formed at a predetermined position in the upper part of the large diameter part 3b, and on the rear end side of the large diameter part 3b, one side part (lower part in FIG. 3 (b)) is inward. The 3rd protrusion 23 protrudes toward.
A small-diameter portion 3g formed on the inner peripheral surface of the main body portion 3 and slidably holds the protective cover 6 and a rear-end side of the small-diameter portion 3g and slidable on the hub 5 A large diameter portion 3h is formed, and a step 3e is formed at the boundary between the small diameter portion 3g and the large diameter portion 3h.
In addition, a first guide groove 16 having a second engagement portion 16a is formed from one end to the rear end on one side of the inner peripheral surface 3f of the main body 3 (upper part in FIG. 3B). A second guide groove 17 in which a third engagement portion 17a is formed is formed in the lower portion of the peripheral surface 3f from the front end to the rear end.
The actuating lever 11 includes an arm portion 11a, a first engaging portion 11b, and a knob 11c. The first engaging portion 11b passes through the first through hole 13.

ハブ５は、針４を保持する保持部５ａと、上記本体部３の大径部３ｂ内を進退動する円筒部５ｂと、輸液チューブの連結される連結部５ｃとから構成され、円筒部５ｂの内周にばね受けが形成され、円筒部５ｂの外周には上記本体部３の後端部の当接する段差５ｆが形成されている。
上記円筒部５ｂの上部には第２貫通孔２２が形成され、一側部（図３（ｂ）下方）には図示左右方向に上記本体部３の第３突起２３の係合する第１ガイド孔１４が形成されている。
また、円筒部５ｂの内周面の下部には、使用状態において上記本体部３の第２ガイド溝１７と同じ位置に第４ガイド溝２４が形成され、さらに上記第１ガイド孔１４の他側部には、使用状態において上記本体部３の第１ガイド溝１６と同じ位置に第５ガイド溝２５が形成されている。 The hub 5 includes a holding portion 5a that holds the needle 4, a cylindrical portion 5b that moves back and forth in the large-diameter portion 3b of the main body portion 3, and a connecting portion 5c that is connected to an infusion tube. The cylindrical portion 5b A spring receiver is formed on the inner periphery of the cylinder portion 5 and a step 5f is formed on the outer periphery of the cylindrical portion 5b.
A second through hole 22 is formed in the upper part of the cylindrical part 5b, and a first guide with which the third protrusion 23 of the main body part 3 engages in one side part (downward in FIG. 3B) in the left-right direction in the figure. A hole 14 is formed.
Further, a fourth guide groove 24 is formed at the same position as the second guide groove 17 of the main body 3 in the use state at the lower portion of the inner peripheral surface of the cylindrical portion 5b, and the other side of the first guide hole 14 is further formed. A fifth guide groove 25 is formed in the part at the same position as the first guide groove 16 of the main body part 3 in use.

上記保護カバー６は上記使用状態において上記本体部３の小径部３ｃ内を摺動する大径部６ｃと、上記ハブ５の円筒部５ｂ内を摺動する小径部６ｄとから構成され、該小径部６ｄの後端部と上記ハブ５の円筒部５ｂとの間に、上記ばね７が弾装されるようになっている。
また保護カバー６の側部には、その後端部に上記本体部３の第１ガイド溝１６およびハブ５の第５ガイド溝２５に沿って移動し、収納状態においては上記第５ガイド溝２５より離脱する第１突起６ａが形成されている。
さらに、保護カバー６の下部には、その後端部に上記本体部３の第２ガイド溝１７およびハブ５の第４ガイド溝２４に沿って移動し、収納状態においては上記第４ガイド溝２４より離脱する第２突起６ｂが形成されている。
そして小径部６ｄの上部には、第３貫通孔３１が穿設されており、該第３貫通孔３１は使用状態において上記本体部３の第１貫通孔１３と同じ位置に設けられている。 The protective cover 6 includes a large-diameter portion 6c that slides in the small-diameter portion 3c of the main body portion 3 and a small-diameter portion 6d that slides in the cylindrical portion 5b of the hub 5 in the use state. The spring 7 is elastically mounted between the rear end portion of the portion 6d and the cylindrical portion 5b of the hub 5.
Further, the side of the protective cover 6 moves along the first guide groove 16 of the main body 3 and the fifth guide groove 25 of the hub 5 at the rear end thereof, and from the fifth guide groove 25 in the housed state. A first protrusion 6a to be detached is formed.
Further, at the lower part of the protective cover 6, the rear end portion moves along the second guide groove 17 of the main body 3 and the fourth guide groove 24 of the hub 5, and in the housed state, from the fourth guide groove 24. A second protrusion 6b to be detached is formed.
And the 3rd through-hole 31 is drilled in the upper part of the small diameter part 6d, and this 3rd through-hole 31 is provided in the same position as the 1st through-hole 13 of the said main-body part 3 in use condition.

そして上記留置針１を使用状態に維持する第１保持機構Ａについて説明すると、図３（ａ）において、上記ばね７の弾性力に抗してハブ５および保護カバー６とを接近させると、上記ハブ５における円筒部５ｂの先端が上記本体部３の段差３ｅに当接するとともに、上記本体部３の後端がハブ５の段差５ｆに当接する。
このとき、本体部３の第１貫通孔１３、ハブ５の第２貫通孔２２、保護カバー６の第３貫通孔３１の位置が一致し、これら貫通孔１３，２２，３１に上記作動レバー１１の第１突起６ａが挿入される。
すると、該第１係合部１１ｂの先端側の端面と、ハブ５の第２貫通孔２２の先端側の端面とが係合し、ハブ５が後端側へ移動するのを規制する。
同時に、第３貫通孔３１に第１突起６ａが挿入されることで、該第１係合部１１ｂの後端側の端面と、第３貫通孔３１の後端側の端面とが係合し、ハブ５が先端側へ移動するのを規制する。
このように、作動レバー１１の第１係合部１１ｂを上記ハブ５の第２貫通孔２２と、保護カバー６の第３貫通孔３１に挿入することで留置針１を使用状態に維持することが可能となっている。 The first holding mechanism A that maintains the indwelling needle 1 in use will be described. In FIG. 3A, when the hub 5 and the protective cover 6 are brought close to each other against the elastic force of the spring 7, The front end of the cylindrical portion 5 b in the hub 5 contacts the step 3 e of the main body 3, and the rear end of the main body 3 contacts the step 5 f of the hub 5.
At this time, the positions of the first through hole 13 of the main body 3, the second through hole 22 of the hub 5, and the third through hole 31 of the protective cover 6 coincide with each other, and the operating lever 11 is placed in these through holes 13, 22, 31. The first protrusion 6a is inserted.
Then, the end face on the front end side of the first engaging portion 11b and the end face on the front end side of the second through hole 22 of the hub 5 are engaged, and the movement of the hub 5 to the rear end side is restricted.
At the same time, the first protrusion 6a is inserted into the third through hole 31 so that the end surface on the rear end side of the first engagement portion 11b and the end surface on the rear end side of the third through hole 31 are engaged. The hub 5 is restricted from moving toward the tip side.
As described above, the indwelling needle 1 is maintained in use by inserting the first engaging portion 11 b of the operating lever 11 into the second through hole 22 of the hub 5 and the third through hole 31 of the protective cover 6. Is possible.

次に、図４を用いて上記本体部３と保護カバー６とを収納状態に維持する第２保持機構Ｂについて説明すると、図１の使用状態から上記第１保持機構Ａを解除すると、上記ハブ５および保護カバー６はばね７の弾性力によって離隔する方向に付勢される。
保護カバー６は本体部３に対して先端側に相対移動し、上記第１突起６ａは本体部３の内周面３ｆに形成された第１ガイド溝１６に沿って移動する。
そして該第１突起６ａの先端側の端面と第１ガイド溝１６の第２係合部１６ａの後端側の端面とが係合し、これ以上保護カバー６は先端側に移動するのが規制され、本体部３より脱落しないようになる。
一方、保護カバー６が本体部３に対して先端側に相対移動すると、上記第２突起６ｂも本体部３の第２ガイド溝１７に沿って移動し、この第２突起６ｂは、上記第３係合部１７ａの傾斜面に接触すると、保護カバー６の内側方向に弾性変形し、その後第３係合部１７ａを超えると元の形状に復帰する。
これにより、第２突起６ｂの後端側の端面と第３係合部１７ａの先端側の端面とが係合し、保護カバー６が後端側に相対移動するのを規制し、使用状態に戻らなくなる。
このように、保護カバー６に形成された第１突起６ａおよび第２突起６ｂを本体部３に形成された第２、第３係合部１６ａ、１７ａに係合させることで、保護カバー６および本体部３の収納状態を維持することができる。 Next, the second holding mechanism B that maintains the main body 3 and the protective cover 6 in the housed state will be described with reference to FIG. 4. When the first holding mechanism A is released from the use state of FIG. 5 and the protective cover 6 are urged in a direction away from each other by the elastic force of the spring 7.
The protective cover 6 moves relative to the front end side with respect to the main body 3, and the first protrusion 6 a moves along the first guide groove 16 formed on the inner peripheral surface 3 f of the main body 3.
The end face on the front end side of the first protrusion 6a and the end face on the rear end side of the second engagement portion 16a of the first guide groove 16 are engaged, and the protective cover 6 is restricted from moving further to the front end side. As a result, the main body 3 does not fall off.
On the other hand, when the protective cover 6 moves relative to the distal end side with respect to the main body portion 3, the second protrusion 6b also moves along the second guide groove 17 of the main body portion 3, and the second protrusion 6b is connected to the third protrusion 6b. If it contacts the inclined surface of the engaging part 17a, it will elastically deform in the inner direction of the protective cover 6, and will return to the original shape after exceeding the 3rd engaging part 17a after that.
Thereby, the end surface on the rear end side of the second protrusion 6b and the end surface on the front end side of the third engagement portion 17a are engaged, and the relative movement of the protective cover 6 to the rear end side is restricted, and the use state is set. It will not return.
Thus, by engaging the first protrusion 6a and the second protrusion 6b formed on the protective cover 6 with the second and third engaging portions 16a and 17a formed on the main body 3, the protective cover 6 and The storage state of the main body 3 can be maintained.

そして本体部３とハブ５とを収納状態に維持する第３保持機構Ｃについて説明すると、図１の使用状態から上記第１保持機構Ａを解除すると、上記ハブ５および保護カバー６はばね７の弾性力によって離隔する方向に付勢される。
ハブ５は本体部３に対して後端側に相対移動し、円筒部３ｂの第３突起２３は本体部３の第１ガイド孔１４に沿って移動する。そして第３突起２３の後端側の端面と第１ガイド孔１４の後端に位置する第４係合部１５の先端側の端面とが係合し、これ以上ハブ５が後端側に移動するのが規制され、本体部３より脱落しなくなる。
一方、上記ハブ５がばね７によって後端側に相対移動すると、上記作動レバー１１の第１係合部１１ｂは再び本体部３の第１貫通孔１３内に収納されるようになっている。このとき、第１係合部１１ｂの後端側の端面と、ハブ５の円筒部５ｂの先端側の端面とが係合し、ハブ５が先端側に移動するのが規制され、使用状態に戻らなくなる。
このように、ハブ５の第３突起２３を本体部３の第４係合部１５に係合させ、かつ作動レバー１１の第１係合部１１ｂにハブ５の円筒部５ｂの先端を当接させることで、ハブ５及び本体部３の収納状態を維持することができる。 The third holding mechanism C that maintains the main body 3 and the hub 5 in the housed state will be described. When the first holding mechanism A is released from the use state of FIG. It is urged in the direction away by the elastic force.
The hub 5 moves relative to the rear end side with respect to the main body 3, and the third protrusion 23 of the cylindrical portion 3 b moves along the first guide hole 14 of the main body 3. Then, the end surface on the rear end side of the third protrusion 23 engages with the end surface on the front end side of the fourth engagement portion 15 located at the rear end of the first guide hole 14, and the hub 5 moves further to the rear end side. To be prevented from falling off from the main body 3.
On the other hand, when the hub 5 is relatively moved to the rear end side by the spring 7, the first engaging portion 11 b of the operating lever 11 is again accommodated in the first through hole 13 of the main body portion 3. At this time, the end surface on the rear end side of the first engaging portion 11b and the end surface on the front end side of the cylindrical portion 5b of the hub 5 are engaged, and the movement of the hub 5 to the front end side is restricted, and the use state is reached. It will not return.
In this way, the third protrusion 23 of the hub 5 is engaged with the fourth engaging portion 15 of the main body 3, and the tip of the cylindrical portion 5 b of the hub 5 is brought into contact with the first engaging portion 11 b of the operating lever 11. By doing so, the accommodation state of the hub 5 and the main-body part 3 can be maintained.

そしてこの第２実施例における留置針１においても、上記第１実施例の留置針１と同様、上記作動レバー１１を操作することにより、留置針１を使用状態から収納状態とすることができる。
つまり使用状態においては患者に接触する部材の長さを短くすることができ、収納状態においては保護カバー６によって針４を収納するとともに、血管をいためるのを防止し、血液が飛散するのを防止することができる。 And also in the indwelling needle 1 in this 2nd Example, by operating the said operating lever 11, the indwelling needle 1 can be made into an accommodation state like the indwelling needle 1 of the said 1st Example.
That is, the length of the member in contact with the patient can be shortened in the use state, and in the stored state, the needle 4 is stored by the protective cover 6, and the blood vessel is prevented from being damaged, and the blood is prevented from scattering. can do.

第１実施例に係る留置針の使用状態を示す図であり、（ａ）は側面方向から見た断面図を、（ｂ）は平面方向から見た断面図を示す。It is a figure which shows the use condition of the indwelling needle which concerns on 1st Example, (a) is sectional drawing seen from the side surface direction, (b) shows sectional drawing seen from the plane direction. 第１実施例に係る留置針の収納状態を示す図であり、（ａ）は側面方向から見た断面図を、（ｂ）は平面方向から見た断面図を示す。It is a figure which shows the accommodation state of the indwelling needle which concerns on 1st Example, (a) is sectional drawing seen from the side surface direction, (b) shows sectional drawing seen from the plane direction. 第２実施例に係る留置針の使用状態を示す図であり、（ａ）は側面方向から見た断面図を、（ｂ）は平面方向から見た断面図を示す。It is a figure which shows the use condition of the indwelling needle which concerns on 2nd Example, (a) is sectional drawing seen from the side surface direction, (b) shows sectional drawing seen from the plane direction. 第２実施例に係る留置針の収納状態を示す図であり、（ａ）は側面方向から見た断面図を、（ｂ）は平面方向から見た断面図を示す。It is a figure which shows the accommodation state of the indwelling needle which concerns on 2nd Example, (a) is sectional drawing seen from the side surface direction, (b) shows sectional drawing seen from the plane direction.

Explanation of symbols

１留置針３本体部
４針５ハブ
６保護カバー６ａ第１突起
６ｂ第２突起７ばね
１１作動レバー１１ｂ第１係合部
１３ａ第１ガイド孔１３ｂ第４係合部
１６第１ガイド溝１６ａ第２係合部
１７第２ガイド溝１７ａ第３係合部
２２ｂ第２貫通孔２２ｃ第３突起
３１第３貫通孔Ａ〜Ｃ第１〜第３保持機構 DESCRIPTION OF SYMBOLS 1 Indwelling needle 3 Body part 4 Needle 5 Hub 6 Protective cover 6a 1st protrusion 6b 2nd protrusion 7 Spring 11 Actuation lever 11b 1st engaging part 13a 1st guide hole 13b 4th engaging part 16 1st guide groove 16a 1st 2 engaging part 17 2nd guide groove 17a 3rd engaging part 22b 2nd through-hole 22c 3rd protrusion 31 3rd through-hole AC 1st-3rd holding mechanism

Claims

A needle having a cutting edge formed at the tip, a cylindrical hub that holds the needle, and a cylindrical protective cover that surrounds the needle and is slidable along the needle;
The protective cover is moved relative to the rear end side of the needle so that the needle edge protrudes from the protective cover, and the protective cover is moved relative to the distal end side of the needle to store the needle edge in the protective cover. In the indwelling needle that can be switched to the storage state,
A cylindrical main body that holds the hub and the protective cover slidably and is fixed to the mounted body, a spring that is elastically mounted between the hub and the protective cover, and compresses the spring to compress the hub and And an operating lever that brings the protective cover closer and maintains the above-mentioned use state,
By operating the operating lever from the use state, the hub and the protective cover are relatively moved away from each other by the elastic force of the spring, and the needle edge of the needle is stored in the protective cover so as to be in the stored state. Indwelling needle characterized by

The hub includes a cylindrical portion in which the protective cover is accommodated and a through-hole is formed, and a spring receiving portion that is located in the cylindrical portion and elastically contacts the spring, and the protective cover faces the cylindrical portion. A first arm projecting from the other end of the arm; and a first engaging unit projecting from the other end of the arm. Consisting of
When making the above usage state,
The first engaging portion of the operating lever is inserted into the through hole of the hub to engage the end surface on the front end side of the first engaging portion with the end surface on the front end side of the through hole. The first protrusion is positioned on the rear end side with respect to the end face on the front end side of the through hole of the hub, and the end face on the front end side of the first protrusion is engaged with the end face on the rear end side of the first engagement portion. The indwelling needle according to claim 1.

The main body portion slidably holds the protective cover therein, a second protrusion protrudes from the outer periphery of the protective cover at a position different from the first protrusion, and the protective cover is formed on the inner peripheral surface of the main body portion. A second engaging portion that contacts the first protrusion, and a third engaging portion that engages the second protrusion,
When setting the storage state,
While holding the end face on the front end side of the first protrusion in these protective covers and the end face on the rear end side of the second engaging part in the main body part so that the protective cover does not fall off from the main body part,
The end face on the rear end side of the second protrusion in the protective cover and the end face on the front end side of the third engaging portion in the main body are brought into contact with each other to hold the protective cover so that it does not return to the use state. The indwelling needle according to claim 2, characterized in that

The hub slidably holds the main body within the cylindrical portion, and is provided with a third protrusion protruding toward the other on either the hub or the main body, and the hub or the main body on the other Providing a fourth engaging portion for engaging the third protrusion;
When setting the storage state,
While holding the end surface on the front end side of the hub in contact with the end surface on the rear end side of the engaging portion of the operating lever so that the hub does not return to use,
The indwelling needle according to claim 2 or 3, wherein the third protrusion and the fourth engaging portion are engaged to hold the hub so that the hub does not fall off from the main body portion.

The indwelling needle according to any one of claims 1 to 4, wherein the main body is provided with a wing-like member for fixing the main body to the mounted body.

An indwelling needle comprising a needle having a cutting edge formed at the tip, a cylindrical hub that holds the needle, and a cylindrical protective cover that surrounds the needle and is slidable along the needle In
A cylindrical main body for slidably holding the hub and the protective cover;
It is elastically mounted between the hub provided on the rear end side of the main body and a protective cover provided on the front end side, and urges the hub and the protective cover in a direction to separate the rear end side and the front end side, respectively. Springs,
A first holding mechanism that holds the hub and the protective cover close to each other with the spring in a compressed state;
With the spring in an extended state, a second holding mechanism that holds the protective cover relatively moved to the front end side of the main body portion on the front end side of the main body portion, and a hub that is relatively moved to the rear end side of the main body portion An indwelling needle comprising: a third holding mechanism that holds the rear end side.