WO2014110823A1 - 一种安全型留置针 - Google Patents

一种安全型留置针 Download PDF

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Publication number
WO2014110823A1
WO2014110823A1 PCT/CN2013/070760 CN2013070760W WO2014110823A1 WO 2014110823 A1 WO2014110823 A1 WO 2014110823A1 CN 2013070760 W CN2013070760 W CN 2013070760W WO 2014110823 A1 WO2014110823 A1 WO 2014110823A1
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WO
WIPO (PCT)
Prior art keywords
needle
hole
needle tip
wall
section
Prior art date
Application number
PCT/CN2013/070760
Other languages
English (en)
French (fr)
Inventor
徐立新
卢峰
Original Assignee
广州阳普医疗科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 广州阳普医疗科技股份有限公司 filed Critical 广州阳普医疗科技股份有限公司
Priority to CN201380068857.0A priority Critical patent/CN105142706B/zh
Priority to PCT/CN2013/070760 priority patent/WO2014110823A1/zh
Publication of WO2014110823A1 publication Critical patent/WO2014110823A1/zh

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/158—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/06—Body-piercing guide needles or the like
    • A61M25/0612—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders
    • A61M25/0618—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders having means for protecting only the distal tip of the needle, e.g. a needle guard
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/06—Body-piercing guide needles or the like
    • A61M25/0606—"Over-the-needle" catheter assemblies, e.g. I.V. catheters

Definitions

  • the invention belongs to the technical field of medical needles, and in particular relates to a safety type indwelling needle.
  • An indwelling needle is a medical device for infusion treatment multiple times over a period of time, generally including a puncture needle and an indwelling catheter that is placed over the puncture needle. Since the indwelling catheter is soft and elastic, when the catheter is left in the blood vessel, the catheter will be twisted and twisted with the blood vessel, so that the indwelling portion of the catheter can still move freely without the risk of puncture the vein. Therefore, the use of an indwelling needle infusion is more secure than a normal scalp needle, and reduces discomfort during patient infusion.
  • indwelling needle also brings the risk of accidental stab wounds to the medical staff after the indwelling needle is puncture. In this case, the medical staff is vulnerable to various dangerous pathogens carried by the blood. Infection.
  • the technical problem to be solved by the present invention is to provide a safety type indwelling needle for shielding the needle tip.
  • the present invention provides the following technical solutions:
  • a safety type indwelling needle comprising a puncture needle body, further comprising a shielding cap, the shielding cap having a first cavity and a first through hole and a second through hole correspondingly disposed on opposite ends of the outer wall of the shielding cap
  • the first through hole and the second through hole are in communication with the first cavity
  • the puncture needle body comprises a needle tube segment and a needle tip segment
  • the needle tip segment is provided with a side hole
  • the segment and the needle tube segment have communicating cavities
  • the junction of the needle tip segment and the needle tube segment has a stepped surface, and the stepped surface forms a limiting portion for preventing the needle tip segment from sliding out of the shielding cap.
  • the distance between the first through hole and the second through hole is greater than the distance from the limiting portion to the tip end of the tip portion.
  • the side hole is located at a junction of the needle tube segment and the needle tip segment.
  • the outer tip shape of the needle tip segment and the needle tube segment are different.
  • the needle tube section has a flat outer wall.
  • the needle tube segment has a semi-annular outer wall.
  • the needle tube segment has a triangular outer wall.
  • the shape of the second through hole is the same as the shape of the outer contour of the needle tube segment.
  • a first extension portion connected to the catheter seat is disposed at the first through hole, and the first extension portion is provided with a third communication that communicates with the first through hole. hole.
  • the first extension portion further includes a buckle
  • the catheter seat is provided with a card slot for use with the buckle.
  • the inner wall of the shielding cap is provided with a second extending portion at the first through hole, and the second extending portion has a fourth through hole communicating with the first through hole, the second The closer the outer wall of the extension is to the second through hole, the smaller its cross sectional area.
  • the safety type indwelling needle comprises a puncture needle body, and further comprises a shielding cap, wherein the shielding cap has a first cavity and a first through hole and a second axially correspondingly disposed on opposite ends of the outer wall of the shielding cap a through hole, the first through hole and the second through hole are in communication with the first cavity, wherein the puncture needle body comprises a needle tube segment and a needle tip segment, and the needle tip segment is provided with a side hole
  • the needle tip segment and the needle tube segment have communicating cavities, and the junction of the needle tip segment and the needle tube segment has a stepped surface, and the stepped surface forms a limiting portion for preventing the needle tip segment from sliding out of the shielding cap
  • the distance between the first through hole and the second through hole is greater than a distance from the limiting portion to the top end of the tip portion.
  • the puncture needle body In use, after the puncture needle body is pulled out, since the distance between the first through hole and the second through hole that the first cavity communicates is larger than the distance from the limit portion to the tip end of the needle tip segment, the puncture needle body can be made The needle tip segment is located in the first cavity of the shielding cap.
  • the limiting portion prevents the needle tip segment from slipping out of the shielding cap, thereby leaving the needle tip segment in the shielding cap, so that the shielding cap and the puncture The needle body is pulled out together. After being unplugged, the shielding cap is inclined to block the needle tip of the puncture needle body.
  • the needle tip segment when unplugging, can also be inclined in the first cavity body, so that the needle tip segment can better catch the shielding cap, and at the same time
  • the needle tip segment drives the shielding cap together, and the needle tip of the needle tip segment is still located in the first cavity after being unplugged, thereby achieving the effect of shielding the needle tip and preventing the needle tip from being exposed to cause an accidental puncture.
  • FIG. 1 is a schematic cross-sectional structural view of a safety type indwelling needle according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a safety type indwelling needle exploded structure according to an embodiment of the present invention
  • FIG. 3 is a schematic structural view of a main body of a puncture needle according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a shielding cap according to an embodiment of the present invention.
  • 5 is a schematic structural view of a puncture needle main body before leaving a catheter hub according to an embodiment of the present invention
  • 6 is a schematic structural view of a needle tip segment of a puncture needle body entering a shielding cap according to an embodiment of the present invention
  • FIG. 7 is a schematic structural view of a needle tip segment of a shield cap protecting a puncture needle body according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural view of a first embodiment of a puncture needle body according to an embodiment of the present invention
  • FIG. 9 is a schematic view showing a structure of a needle tube segment in a first embodiment of a puncture needle body according to an embodiment of the present invention
  • FIG. 10 is a schematic structural view of a front view of a second through hole of a shield cap according to a first embodiment of the present invention.
  • FIG. 11 is a schematic structural view of a second embodiment of a puncture needle body according to an embodiment of the present invention.
  • FIG. 12 is a schematic view showing the structure of a needle tube segment in a second embodiment of the puncture needle body according to an embodiment of the present invention.
  • FIG. 13 is a schematic front view showing the structure of a second through hole of a shielding cap in a second embodiment of the puncture needle body according to an embodiment of the present invention
  • FIG. 14 is a schematic structural view of a third embodiment of a puncture needle body according to an embodiment of the present invention.
  • Figure 15 is a schematic view showing the structure of a needle tube segment in a third embodiment of the puncture needle body according to an embodiment of the present invention.
  • 16 is a front view showing the structure of a second through hole of a shielding cap in a third embodiment of the puncture needle body according to an embodiment of the present invention
  • FIG. 17 is a schematic structural diagram of a second extension of a shield cap according to an embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional structural view of a safety type indwelling needle according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an explosion structure of a safety type indwelling needle according to an embodiment of the present invention.
  • the safety type indwelling needle provided by the embodiment of the present invention includes a puncture needle body, and further includes a shielding cap 3 having a first cavity 33 and a first through hole 32 correspondingly disposed on two ends of the outer wall of the shielding cap 3 in the axial direction.
  • the puncture needle body 1 comprises a needle tube segment 13 and a needle tip segment 11, and the needle tip segment 11 is provided with a side hole 12
  • the needle tip segment 11 and the needle tube segment 13 have communicating cavities, and the junction of the needle tip segment 11 and the needle segment 13 has a stepped surface, and the stepped surface forms a limiting portion for preventing the needle tip segment from sliding out of the shielding cap 3, the first through hole 32 and The spacing of the second through holes 34 is greater than the distance from the limiting portion to the tip end of the tip portion 11.
  • FIG. 5 is a schematic structural view of the puncture needle main body when leaving the catheter hub according to an embodiment of the present invention.
  • the first through hole 32 communicating with the first cavity 33 is used.
  • the distance from the second through hole 34 is greater than the distance from the limiting portion to the tip end of the needle tip segment 11, so that the needle tip segment 11 of the puncture needle body 1 can be located in the first cavity 33 of the shielding cap 3 when the puncture needle body 1 is
  • the stopper prevents the needle tip section 11 from slipping out of the shield cap 3, thereby leaving the needle tip section 11 in the shield cap 3, so that the shield cap 3 is pulled out together with the puncture needle body 1.
  • the shield cap 3 is inclined to block the tip of the puncture needle body 1.
  • FIG. 6 is a schematic structural diagram of a needle tip segment of a puncture needle body entering a shielding cap according to an embodiment of the present invention.
  • the needle tip segment 11 may be obliquely disposed in the first cavity 33, so that The needle tip segment 11 better catches the shield cap 3, and at the same time, the puncture needle body 1 is pulled out, then the needle tip segment 11 drives the shield cap 3 - the same, and the needle tip of the needle tip segment 11 remains in the first cavity 33 after being unplugged.
  • FIG. 7 FIG.
  • FIG. 7 is a schematic structural diagram of a needle tip segment of a body of a puncture needle protected by a shielding cap according to an embodiment of the present invention, thereby achieving the effect of shielding the needle tip and preventing the pin tip from being exposed to cause an accidental puncture.
  • the front end of the puncture needle body 1 is shielded in the shielding cap 3 to achieve safe disposal, so that the medical staff is protected from accidental acupuncture and infected with infectious diseases.
  • the structure is simple, compact, and low in cost.
  • the outer contour shape of the needle tip segment 11 and the needle tube segment 13 are different.
  • the shape different from the tip segment 11 that is, the shape of the outer contour is different, and a step surface can be formed at the junction of the needle segment 13 and the tip segment 11 , and the step surface can be used as a limiting portion.
  • the second through hole 34 is formed in the same shape as the needle tube section 13, that is, the shape of the second through hole 34 is the same as the outer contour shape of the needle tube section 13, which shape can allow the needle tube section 13 to pass and the needle tip section 11 to be It can be passed, in general, the tip section 11 can be set to a common annular structure, and the needle section 13 can be other outer wall shape different from the ring shape.
  • the first through hole 32 is adapted to receive the passage of the needle tip segment 11, and the function of the needle tip segment 11 itself is not affected, and the second through hole 34 can accommodate the passage of the needle segment 13 and the cross-sectional area of the second through hole 34 is smaller than the tip segment
  • the cross-sectional area of 11 that is, the needle tube section 13 can pass through the second through hole 34 and the needle tip section 11 does not.
  • the needle tip section 11 is caught on the second through hole 34, so that the needle tip section 11 can better block the shielding.
  • the cap 3 is such that the shield cap 3 is pulled out together with the puncture needle body 1.
  • the side hole 12 is located at the junction of the needle tube section 13 and the needle tip section 11. Since the side hole 12 is for guiding blood, when the puncture needle body 1 is pulled out, blood will necessarily flow out from the side hole 12, and when the side hole 12 is located at the junction of the needle tube section 13 and the needle tip section 11, If the blood flows out of the side hole 12, it will flow into the first cavity 33, and no external flow will cause contamination.
  • FIG. 8 is a schematic structural view of a first embodiment of a puncture needle body according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a needle segment structure in a first embodiment of a puncture needle body according to an embodiment of the present invention
  • FIG. 10 is a front view showing the structure of a second through hole of a shielding cap in a first embodiment of a puncture needle body according to an embodiment of the present invention.
  • the needle tube section 13 has a flat outer wall, and the needle tube section 13 of the flat outer wall naturally forms a step surface when used in conjunction with the annular needle tip section 11, and the step surface is used as a limiting portion, so that the needle body 1 is pulled out. At this time, the tip section 11 can catch the shield cap 3.
  • FIG. 11 is a schematic structural view of a second embodiment of a puncture needle body according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of a needle segment structure in a second embodiment of a puncture needle body according to an embodiment of the present invention
  • FIG. 13 is a second specific embodiment of a puncture needle body according to an embodiment of the present invention
  • the needle tube section 13 has a semi-annular outer wall, and the needle tube section 13 of the semi-annular outer wall naturally forms a step surface when used in conjunction with the annular needle tip section 11.
  • the step surface is used as a limiting portion, and the needle tip section 11 can be stuck. Live the shield cap 3.
  • FIG. 14 is a schematic structural view of a third embodiment of a puncture needle body according to an embodiment of the present invention
  • FIG. 15 is a third embodiment of a puncture needle body according to an embodiment of the present invention
  • FIG. 16 is a schematic front view showing the structure of a second through hole of a shielding cap in a third embodiment of the puncture needle body according to an embodiment of the present invention.
  • the needle tube segment 13 has a triangular outer wall, and the needle tube segment 13 of the oblate outer wall naturally forms a stepped surface when used in conjunction with the annular needle tip segment 11.
  • the stepped surface serves as a limiting portion, and the needle tip segment 11 can be stuck.
  • Shield cap 3 serves as a limiting portion, and the needle tip segment 11 can be stuck.
  • a first extending portion 35 connected to the catheter socket 2 is disposed at the first through hole 32. As shown in FIG. 4, the first extending portion 35 is open to communicate with the first through hole 32. The third through hole 31.
  • An extension portion 35 may be an insertion device, the outer wall of which can be inserted into the catheter hub 2 to serve as a fixed connection, and may of course also be a buckle 36, and a catheter 36 is provided on the catheter adapter 2 to cooperate with the buckle 36.
  • the card slot is used to achieve the effect of fixing the shield cap 3 to the catheter hub 2. It is of course also possible to include the insertion device and the buckle 36 at the same time to better secure the shield cap 3 to the catheter hub 2. At the same time, the puncture needle body 1 can obtain a certain positioning aid of the shield cap 3 when in use.
  • the third through hole 31 may be a tapered hole whose hole diameter gradually increases away from the first through hole 32, so that when the puncture needle main body 1 passes through the first through hole 32, the tip end portion thereof The range of activities is greater, which facilitates the insertion of the tip section 11.
  • FIG. 17 is a schematic structural view of a second extension of a shield cap according to an embodiment of the present invention. Specifically, on the inner wall of the shielding cap 3, a second extending portion 37 is disposed at the first through hole 32, and the second extending portion 37 has a fourth through hole 38 communicating with the first through hole 32, and the second extending portion 37 The closer the outer wall is to the second through hole 34, the smaller the cross sectional area thereof.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hematology (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

一种安全型留置针，包括穿刺针主体（1），还包括屏蔽帽（3），所述屏蔽帽（3）具有第一腔体（33）和轴向对应设置在所述屏蔽帽（3）外壁两端上的第一通孔（32）和第二通孔（34），所述第一通孔（32）和所述第二通孔（34）与所述第一腔体（33）连通，其中，所述穿刺针主体（1）包括针管段（13）和针尖段（11），所述针尖段（11）上设置有侧孔（12），所述针尖段（11）和所述针管段（13）具有连通的腔孔，所述针尖段（11）和所述针管段（13）的结合处具有台阶面，所述台阶面形成阻止所述针尖段（11）滑出所述屏蔽帽（3）的限位部，所述第一通孔（32）和所述第二通孔（34）的间距大于所述限位部到所述针尖段（11）的顶端的距离。该安全型留置针具有屏蔽针尖的效果，能够防止针尖露出造成意外刺伤。

Description

一种安全型留置针 技术领域
本发明属于医疗用针技术领域， 尤其涉及一种安全型留置针。
背景技术
留置针是一种用于在一定时间内多次进行输液治疗的医疗器械，一般包括 穿刺针和套在穿刺针上面的留置导管。 由于留置导管柔软且有弹性， 当导管留 置于血管中时，导管会随着血管同步曲折，使得导管留置的部位仍可自由动作， 不会有穿刺静脉的危险。 因此， 相对普通的头皮针， 使用留置针输液更具有安 全性， 并且减少患者输液时的不适感。
留置针的使用同时也带来了留置针穿刺后，暴露出来的针尖会发生意外的 刺伤医护人员的危险，在这种情况下， 就使得医护人员很容易受到血液携带的 各种危险的病原体的感染。
发明内容
有鉴于此， 本发明要解决的技术问题在于在于提供一种安全型留置针， 以 屏蔽针尖。
为了达到上述目的， 本发明提供如下技术方案：
一种安全型留置针， 包括穿刺针主体， 还包括屏蔽帽， 所述屏蔽帽具有第 一腔体和轴向对应设置在所述屏蔽帽外壁两端上的第一通孔和第二通孔，所述 第一通孔和所述第二通孔与所述第一腔体连通， 其中， 所述穿刺针主体包括针 管段和针尖段， 所述针尖段上设置有侧孔， 所述针尖段和所述针管段具有连通 的腔孔， 所述针尖段和所述针管段的结合处具有台阶面， 所述台阶面形成阻止 所述针尖段滑出所述屏蔽帽的限位部，所述第一通孔和所述第二通孔的间距大 于所述限位部到所述针尖段的顶端的距离。
优选的， 上述侧孔位于所述针管段与所述针尖段的结合处。
优选的 , 上述针尖段和所述针管段的外部轮廓形状不同。
优选的， 上述针管段具有扁平外壁。
优选的， 上述针管段具有半环形外壁。
优选的， 上述针管段具有三角形外壁。 优选的 , 上述第二通孔的形状与所述针管段的外部轮廓形状相同。
优选的， 上述屏蔽帽的外壁上，位于所述第一通孔处设置有与导管座连接 的第一延伸部 , 所述第一延伸部开设有与所述第一通孔连通的第三通孔。
优选的， 上述第一延伸部还包括卡扣， 所述导管座上设置有与所述卡扣配 合使用的卡槽。
优选的， 上述屏蔽帽的内壁上， 位于所述第一通孔处设置有第二延伸部， 所述第二延伸部具有与所述第一通孔连通的第四通孔 ,所述第二延伸部的外壁 随着与所述第二通孔距离越近， 其横截面积越小。
本发明提供的安全型留置针， 包括穿刺针主体， 还包括屏蔽帽， 所述屏蔽 帽具有第一腔体和轴向对应设置在所述屏蔽帽外壁两端上的第一通孔和第二 通孔， 所述第一通孔和所述第二通孔与所述第一腔体连通， 其中， 所述穿刺针 主体包括针管段和针尖段， 所述针尖段上设置有侧孔， 所述针尖段和所述针管 段具有连通的腔孔， 所述针尖段和所述针管段的结合处具有台阶面， 所述台阶 面形成阻止所述针尖段滑出所述屏蔽帽的限位部，所述第一通孔和所述第二通 孔的间距大于所述限位部到所述针尖段的顶端的距离。
使用时，在拔出穿刺针主体后， 由于第一腔体连通的第一通孔和所述第二 通孔的间距大于限位部到针尖段的顶端的距离，那么就可以使得穿刺针主体的 针尖段位于屏蔽帽的第一腔体中， 当穿刺针主体拔下时， 限位部阻止针尖段从 屏蔽帽中滑出，从而将针尖段留在了屏蔽帽中，使得屏蔽帽与穿刺针主体一同 拔下。 而拔下后， 屏蔽帽斜置， 遮挡住穿刺针主体的针尖， 当然， 在拔下时， 也可以在第一腔体中斜置针尖段，使得针尖段更好的卡住屏蔽帽， 同时拔出穿 刺针主体， 那么针尖段带动屏蔽帽一同拔下， 并且在拔下后针尖段的针尖仍旧 位于第一腔体中， 从而达到了屏蔽针尖效果， 防止针尖露出造成意外刺伤。
附图说明
图 1为本发明实施例提供的安全型留置针使用前剖视结构示意图； 图 2为本发明实施例提供的安全型留置针爆炸结构示意图；
图 3为本发明实施例提供的穿刺针主体结构示意图；
图 4为本发明实施例提供的屏蔽帽结构示意图；
图 5为本发明实施例提供的穿刺针主体离开导管座前的结构示意图； 图 6 为本发明实施例提供的穿刺针主体的针尖段进入屏蔽帽的结构示意 图；
图 7 为本发明实施例提供的屏蔽帽保护穿刺针主体的针尖段的结构示意 图；
图 8为本发明实施例提供的穿刺针主体第一种具体实施方式结构示意图； 图 9 为本发明实施例提供的穿刺针主体第一种具体实施方式中针管段结 构示意图；
图 10为本发明实施例提供的穿刺针主体第一种具体实施方式中屏蔽帽第 二通孔处的主视图结构示意图；
图 11 为本发明实施例提供的穿刺针主体第二种具体实施方式结构示意 图；
图 12为本发明实施例提供的穿刺针主体第二种具体实施方式中针管段结 构示意图；
图 13为本发明实施例提供的穿刺针主体第二种具体实施方式中屏蔽帽第 二通孔处的主视图结构示意图；
图 14 为本发明实施例提供的穿刺针主体第三种具体实施方式结构示意 图；
图 15为本发明实施例提供的穿刺针主体第三种具体实施方式中针管段结 构示意图；
图 16为本发明实施例提供的穿刺针主体第三种具体实施方式中屏蔽帽第 二通孔处的主视图结构示意图；
图 17为本发明实施例提供的屏蔽帽的第二延伸部的结构示意图。
上图 1-17中：
穿刺针主体 1、 针尖段 11、 侧孔 12、 针管段 13、 第二腔体 14、 导管座 2、 屏蔽帽 3、 第三通孔 31、 第一通孔 32、 第一腔体 33、 第二通孔 34、 第一延伸 部 35、 卡扣 36、 第二沿伸部 37、 第四通孔 38、 隔离塞 4。
具体实施方式
为了进一步了解本发明， 下面结合实施例对本发明优选实施方案进行描 述， 但是应当理解， 这些描述只是为进一步说明本发明的特征和优点， 而不是 对本发明权利要求的限制。
请参考图 1和图 2, 图 1为本发明实施例提供的安全型留置针使用前剖视 结构示意图， 图 2为本发明实施例提供的安全型留置针爆炸结构示意图。
本发明实施例提供的安全型留置针， 包括穿刺针主体， 还包括屏蔽帽 3 , 屏蔽帽 3具有第一腔体 33和轴向对应设置在屏蔽帽 3外壁两端上的第一通孔 32和第二通孔 34, 第一通孔 32和第二通孔 34与第一腔体 33连通， 其中， 穿 刺针主体 1包括针管段 13和针尖段 11 , 针尖段 11上设置有侧孔 12, 针尖段 11和针管段 13具有连通的腔孔,针尖段 11和针管段 13的结合处具有台阶面， 台阶面形成阻止针尖段滑出屏蔽帽 3 的限位部， 第一通孔 32和第二通孔 34 的间距大于限位部到针尖段 11的顶端的距离。
请参考图 5 , 图 5为本发明实施例提供的穿刺针主体离开导管座时的结构 示意图， 使用时， 在拔出穿刺针主体 1后， 由于第一腔体 33连通的第一通孔 32和第二通孔 34的间距大于限位部到针尖段 11的顶端的距离， 那么就可以 使得穿刺针主体 1的针尖段 11位于屏蔽帽 3的第一腔体 33中，当穿刺针主体 1拔下时， 限位部阻止针尖段 11从屏蔽帽 3中滑出， 从而将针尖段 11留在了 屏蔽帽 3 中， 使得屏蔽帽 3与穿刺针主体 1一同拔下。 而拔下后， 屏蔽帽 3 斜置， 遮挡住穿刺针主体 1的针尖。
请参考图 6, 图 6为本发明实施例提供的穿刺针主体的针尖段进入屏蔽帽 的结构示意图， 当然， 在拔下时， 也可以在第一腔体 33中斜置针尖段 11 , 使 得针尖段 11更好的卡住屏蔽帽 3 , 同时拔出穿刺针主体 1 , 那么针尖段 11带 动屏蔽帽 3—同拔下，并且在拔下后针尖段 11的针尖仍旧位于第一腔体 33中， 请参考图 7, 图 7为本发明实施例提供的屏蔽帽保护穿刺针主体的针尖段的结 构示意图， 从而达到了屏蔽针尖效果， 防止针尖露出造成意外刺伤。
那么在正常的退出穿刺针管的过程中同步将穿刺针主体 1 前端屏蔽在屏 蔽帽 3中， 实现安全丟弃， 使医护人员免于意外的针刺而感染传染性疾病。 另 夕卜， 同时结构简单、 紧凑， 成本较低。
具体的， 针尖段 11和针管段 13的外部轮廓形状不同。 将针管段 13做成 与针尖段 11相异的形状， 也就是其外部轮廓形状不同， 就可以在针管段 13做 成与针尖段 11的结合处形成一个台阶面， 该台阶面作为限位部使用， 当然， 也可以同时将第二通孔 34做成与针管段 13相同的形状， 也就是第二通孔 34 的形状与针管段 13的外部轮廓形状相同，该形状能够允许针管段 13通过并使 得针尖段 11不能够通过，一般情况下，针尖段 11可以设置成普通的环形结构， 针管段 13可以是其他的有异于环形的外壁形状。
当然也可以将第二通孔 34的横截面积缩小到针尖段 11不能通过，同时缩 小针管段 13的横截面积， 使得针管段 13能够通过第二通孔 34。 第一通孔 32 是能容纳针尖段 11通过的， 那么针尖段 11本身的功能没有受到影响， 而第二 通孔 34能容纳针管段 13通过且第二通孔 34的横截面积小于针尖段 11的横截 面积， 也就是针管段 13能够从第二通孔 34中通过而针尖段 11则不能， 针尖 段 11卡在第二通孔 34上， 那么针尖段 11能够更好的卡住屏蔽帽 3 , 使得屏 蔽帽 3与穿刺针主体 1一同拔下。
具体的， 侧孔 12位于针管段 13与针尖段 11的结合处。 由于侧孔 12是用 于导流血液的， 那么当穿刺针主体 1拔出时， 必然会有血液从侧孔 12中流出， 当侧孔 12位于针管段 13与针尖段 11的连接处时，血液如果从侧孔 12中流出， 就会流入到第一腔体 33中， 不会外流造成污染。
请参考图 8-10,图 8为本发明实施例提供的穿刺针主体第一种具体实施方 式结构示意图；图 9为本发明实施例提供的穿刺针主体第一种具体实施方式中 针管段结构示意图； 图 10为本发明实施例提供的穿刺针主体第一种具体实施 方式中屏蔽帽第二通孔处的主视图结构示意图。 具体的， 针管段 13具有扁平 外壁， 扁平外壁的针管段 13在与环形的针尖段 11配合使用时， 会自然形成一 个台阶面， 该台阶面作为限位部使用， 使得穿刺针主体 1拔出时， 针尖段 11 能够卡住屏蔽帽 3。
请参考图 11-13 ,图 11为本发明实施例提供的穿刺针主体第二种具体实施 方式结构示意图； 图 12为本发明实施例提供的穿刺针主体第二种具体实施方 式中针管段结构示意图； 图 13为本发明实施例提供的穿刺针主体第二种具体 实施方式中屏蔽帽第二通孔处的主视图结构示意图。 具体的， 针管段 13具有 半环形外壁， 半环形外壁的针管段 13在与环形的针尖段 11配合使用时， 会自 然形成一个台阶面， 该台阶面作为限位部使用， 针尖段 11能够卡住屏蔽帽 3。
请参考图 14-16,图 14为本发明实施例提供的穿刺针主体第三种具体实施 方式结构示意图； 图 15为本发明实施例提供的穿刺针主体第三种具体实施方 式中针管段结构示意图； 图 16为本发明实施例提供的穿刺针主体第三种具体 实施方式中屏蔽帽第二通孔处的主视图结构示意图。 具体的， 针管段 13具有 三角形外壁， 扁圓外壁的针管段 13在与环形的针尖段 11配合使用时， 会自然 形成一个台阶面， 该台阶面作为限位部使用， 针尖段 11能够卡住屏蔽帽 3。
具体的， 屏蔽帽 3的外壁上， 位于第一通孔 32处设置有与导管座 2连接 的第一延伸部 35 ,如图 4, 第一延伸部 35开设有与第一通孔 32连通的第三通 孔 31。 留置针在使用时， 穿刺针主体 1会穿过导管座 2, 同时穿过位于导管座 2中的隔离塞 4, 第一延伸部 35主要用于将屏蔽帽 3与导管座 2固定连接， 第 一延伸部 35可以是一个插入装置， 其外壁能够插入到导管座 2中， 起到固定 连接的作用， 当然也可以是一个卡扣 36, 同时在导管座 2上设置一个与该卡 扣 36配合使用的卡槽， 达到将屏蔽帽 3固定在导管座 2上的效果， 当然也可 以同时包括插入装置与卡扣 36, 以便更好的将屏蔽帽 3 固定在导管座 2上。 同时， 穿刺针主体 1在使用时能够得到屏蔽帽 3的一定的定位帮助。
同时， 第三通孔 31可以是一个圓锥孔， 其孔径随着远离第一通孔 32而逐 渐增大， 这样， 当穿刺针主体 1从第一通孔 32中穿出时， 其针尖段的活动范 围更大， 有利于针尖段 11的插入。
请参考图 17, 图 17为本发明实施例提供的屏蔽帽的第二延伸部的结构示 意图。具体的，屏蔽帽 3的内壁上，位于第一通孔 32处设置有第二延伸部 37, 第二延伸部 37具有与第一通孔 32连通的第四通孔 38, 第二延伸部 37的外壁 随着与第二通孔 34距离越近， 其横截面积越小。
这样， 当针尖段 11拔出， 并容纳在第一腔体 33 中时， 受第二延伸部 37 的影响， 很难再次从第一通孔 32中穿出， 第二延伸部 37使得针尖段 11很容 易滑离正对第一通孔 32的位置， 同时帮助针尖段 11斜置在第一腔体 33中。 的说明只是用于帮助理解本发明的方法及其核心思想。应当指出， 对于本技术 领域技术人员来说， 在不脱离本发明原理的前提下，还可以对本发明进行若干 改进和修饰， 这些改进和修饰也落入本发明权利要求的保护范围内。

Claims

权 利 要 求
1、一种安全型留置针， 包括穿刺针主体，其特征在于，还包括屏蔽帽（3), 所述屏蔽帽 （3)具有第一腔体（33)和轴向对应设置在所述屏蔽帽 （3) 外壁两端上的第一通孔（32)和第二通孔（34), 所述第一通孔（32)和所述 第二通孔（34)与所述第一腔体（33)连通，
其中， 所述穿刺针主体 ( 1 ) 包括针管段 ( 13 )和针尖段 ( 11 ), 所述针尖 段（ 11 )上设置有侧孔 ( 12 ), 所述针尖段（ 11 )和所述针管段 ( 13 )具有连 通的腔孔， 所述针尖段 ( 11 )和所述针管段 ( 13 )的结合处具有台阶面， 所述 台阶面形成阻止所述针尖段滑出所述屏蔽帽 （ 3 ) 的限位部，
所述第一通孔（32)和所述第二通孔（34)的间距大于所述限位部到所述 针尖段 ( 11 ) 的顶端的距离。
2、 根据权利要求 1所述的安全型留置针， 其特征在于， 所述侧孔（12) 位于所述针管段（ 13 )与所述针尖段（ 11 ) 的结合处。
3、 根据权利要求 1所述的安全型留置针， 其特征在于， 所述针尖段 ( 11 ) 和所述针管段（13) 的外部轮廓形状不同。
4、 根据权利要求 3所述的安全型留置针， 其特征在于， 所述针管段（13) 具有扁平外壁。
5、 根据权利要求 3所述的安全型留置针， 其特征在于， 所述针管段（13) 具有半环形外壁。
6、 根据权利要求 3所述的安全型留置针， 其特征在于， 所述针管段（13) 具有三角形外壁。
7、根据权利要求 3所述的安全型留置针，其特征在于，所述第二通孔（34) 的形状与所述针管段 ( 13) 的外部轮廓形状相同。
8、 根据权利要求 1所述的安全型留置针， 其特征在于， 所述屏蔽帽 （3) 的外壁上， 位于所述第一通孔（32)处设置有与导管座（2)连接的第一延伸 部 （35), 所述第一延伸部 （35)开设有与所述第一通孔（32)连通的第三通 孔（31)。
9、 根据权利要求 7所述的安全型留置针， 其特征在于， 所述第一延伸部 (35)还包括卡扣（36), 所述导管座（2)上设置有与所述卡扣（36)配合使 用的卡槽。
10、 根据权利要求 1所述的安全型留置针， 其特征在于， 所述屏蔽帽（3) 的内壁上， 位于所述第一通孔（32)处设置有第二延伸部 （37), 所述第二延 伸部 （37)具有与所述第一通孔（32)连通的第四通孔 （38), 所述第二延伸 部 （37) 的外壁随着与所述第二通孔（34)距离越近， 其横截面积越小。
-μ
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