WO2018209498A1 - 前伸针杆安全型开放式留置针 - Google Patents

前伸针杆安全型开放式留置针 Download PDF

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Publication number
WO2018209498A1
WO2018209498A1 PCT/CN2017/084346 CN2017084346W WO2018209498A1 WO 2018209498 A1 WO2018209498 A1 WO 2018209498A1 CN 2017084346 W CN2017084346 W CN 2017084346W WO 2018209498 A1 WO2018209498 A1 WO 2018209498A1
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WO
WIPO (PCT)
Prior art keywords
needle
sleeve
seat
inner cavity
catheter
Prior art date
Application number
PCT/CN2017/084346
Other languages
English (en)
French (fr)
Inventor
陈永曦
Original Assignee
福建省百仕韦医用高分子股份有限公司
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 福建省百仕韦医用高分子股份有限公司 filed Critical 福建省百仕韦医用高分子股份有限公司
Priority to PCT/CN2017/084346 priority Critical patent/WO2018209498A1/zh
Priority to CN201780090653.5A priority patent/CN110678214B/zh
Publication of WO2018209498A1 publication Critical patent/WO2018209498A1/zh

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    • 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
    • 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
    • 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
    • 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
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles

Definitions

  • the invention relates to an indwelling needle, in particular to a safety needle type open indwelling needle.
  • FIG. 1 An open indwelling needle of the prior art is shown in Fig. 1, which is composed of a catheter assembly 1, a puncture assembly 2, wherein the puncture assembly is composed of a puncture needle needle 2.1 and a needle hub 2.2, and the catheter assembly 1 is composed of a catheter and a catheter hub.
  • the catheter hub has a front lumen and a posterior lumen, and the catheter is inserted into the anterior lumen.
  • the needle tube sequentially passes through the catheter assembly, and the inner cavity and the front inner cavity finally pass out the front end of the catheter.
  • the needle tip exposes the tip of the catheter, and the rear end of the needle tube is inserted into the needle seat.
  • the inner cavity of the needle tube communicates with the blood return cavity of the posterior segment of the needle seat, and the needle seat
  • the front short frustum is inserted into the inner end of the catheter assembly, and the depth of the lumen of the insertion catheter is shallow, less than one quarter of the length of the lumen behind the catheter hub. This requires a longer needle length.
  • the long sleeve can be hindered when the needle is inserted into the blood vessel, and the operation is inconvenient.
  • the object of the present invention is to overcome the deficiencies in the prior art, and to provide a needle-opening needle safety-type open-type indwelling needle with a relatively low needle tube material strength and a relatively low manufacturing process requirement, and a further object of the present invention.
  • the utility model relates to a safety type open type indwelling needle which is provided with a short protective sleeve and is easy to operate.
  • the object of the present invention is achieved by the following route.
  • a needle-opening safety open indwelling needle comprising a catheter assembly and a puncture assembly
  • the puncture assembly comprises a puncture needle and a needle hub
  • the catheter assembly comprising a catheter and a catheter hub
  • the catheter hub having a front lumen and a posterior lumen
  • the catheter being inserted
  • the needle seat comprises a front section and a rear section
  • the front section is set in the inner cavity of the catheter seat
  • the rear section of the needle seat is exposed outside the catheter seat
  • the rear end of the needle tube is inserted into the needle seat
  • the posterior segment is connected to the blood chamber, and the needle tube is sequentially passed through the lumen of the catheter hub and the front end of the catheter.
  • the tip of the needle exposes the tip of the catheter.
  • the main point of the structure is that the front portion of the needle holder has a long rod shape and extends from the rear end surface of the catheter holder.
  • the joint is placed or inserted close to the front and rear lumens of the catheter hub, and the insertion depth is greater than three quarters of the length of the lumen after the catheter hub.
  • the length of the needle exposed outside the needle holder is greatly reduced.
  • Another unexpected effect is that the front section of the forwardly extending hub can be connected to the outer wall to achieve a sliding sleeve, which means that a part of the length of the needle replaced by the front of the needle can be telescoped through the sleeve connection.
  • the object of the present invention can also be achieved by the following means.
  • the utility model further comprises a needle wrapped wrap assembly, the front end of which is snap-connected with the rear end of the catheter seat, the rear part of the needle seat is sleeved in the inner cavity of the needle wrap sleeve assembly, and the operating handle exposed outside the needle wrap sleeve assembly is worn.
  • An axially extending sliding slot on the side wall of the assembly is coupled to the needle seat, and the rear end of the sliding slot is opened.
  • the needle wrap cannula assembly is a protective wrap assembly that is used to wrap the needle from the catheter hub after the puncture is completed to avoid exposure.
  • Protective sleeve assemblies are common in the prior art.
  • syringe wrap sleeve assembly a further preferred for the syringe wrap sleeve assembly is:
  • the needle wrapping sleeve assembly comprises a wrapping sleeve and a locking connector, the front end of the wrapping sleeve is snap-connected with the rear end of the catheter seat, the sliding slot extends axially along the sidewall thereof to the rear opening, and the locking connector and the wrapping sleeve are slid
  • the sleeve is connected to the elastic connecting card of the rear end of the wrapping sleeve, and the front sleeve of the needle seat is connected in the inner cavity of the locking connector, and the locking device of the locking mechanism is located Between the front section of the hub and the locking connector.
  • the locking connector sliding sleeve is connected in the inner cavity of the wrapping sleeve, the elastic convex card has a resilient arm, the elastic arm is located on the wrapping sleeve, and the convex point of the buckle is disposed on the inner side of the elastic arm, and is used for withdrawing the needle tube and then engaging the corresponding In the matching through hole or in the groove, the locking connector is restrained from moving forward, and the through hole or groove is located at the rear of the locking connector.
  • the other is:
  • the locking connector is composed of a body, a ring and a rib.
  • the ring ring surrounds the body and is integrally connected by a radial rib.
  • the rib is matched with the sliding slot, and the body sliding sleeve is connected in the inner cavity of the package sleeve.
  • the ring sleeve is attached to the outer peripheral wall of the wrapping sleeve, and the locking connector sliding to the rear end of the wrapping sleeve and the elastic convex card buckle connection at the rear end of the wrapping sleeve are located between the ring and the wrapping sleeve.
  • the slot on the wrapping sleeve can be restricted to open, which can greatly reduce the amplitude of the artificial swing in the front part of the needle seat, so that the needle can be wrapped more reliably.
  • the elastic connection of the wrapping sleeve and the locking connector can also be a snap ring and a convex card.
  • the elastic convex card on the wrapping sleeve is composed of two convex cards with a certain axial distance, and the top surface of the convex card is high. Out of the outer surface of the casing, the two convex cards are on the same line, Or it is arranged in the axial misalignment, and a rectangular cross section is arranged on the front and the back of the ring.
  • the vertical convex surface of the front convex card on the wrapping sleeve touches the front vertical surface of the ring of the locking connector, and the locking is locked.
  • the connecting member moves forward, and the erecting surface of the rear convex card on the wrapping sleeve contacts the rear vertical surface of the locking connector ring, in that the locking locking connector slides out of the wrapping sleeve.
  • the other is:
  • the tail end of the outer sleeve of the wrapped sleeve is provided with a shoulder that can block the detachment of the ring, and the tail end of the sliding slot on the wrapping sleeve has an elastic buckle, and the distance and circle of the elastic buckle from the shoulder
  • the ring thickness has a matching fit.
  • the ring can be trapped between the shoulder and the elastic buckle, so that when the indwelling needle is withdrawn, the locking connector can not advance or retreat relative to the wrapping sleeve.
  • the front portion of the wrapped sleeve has either a symmetrical or a single curved piece, and the curved piece is inserted between the two fixed lugs at the rear end of the catheter seat for preventing the rotation of the catheter holder during the puncture, the wrapping sleeve
  • the front section of the tube is either integrally formed with the wrapped sleeve body or separate from the wrapped sleeve body. When the split body is constructed, the body is elastically buckled with the front section of the wrapped sleeve.
  • a convex card is arranged at the inner corner of the leading edge of the circular arc piece to facilitate hooking the outer peripheral flange of the rear end of the catheter seat, so that the wrapping sleeve is kept connected with the catheter assembly until the indwelling needle is not finished.
  • the inner cavity of the locking connector has a resilient convex card, and the convex point is disposed on the inner side of the elastic arm. After the needle is withdrawn, it is used to abut the front end surface of the front portion of the needle seat, and the front portion of the needle seat is restricted to move forward.
  • the locking connector has a step shape.
  • the inner cavity wherein the one cavity has an inner chord plane corresponding to the outer chord plane of the front section of the needle seat, the inner chord plane is on the same side as the elastic convex card, and the convex top of the plane and the elastic convex card
  • the surface is flush, the front end of the outer chord plane of the front part of the needle seat blindly forms an outer stepped shoulder, and the stepped shoulder is matched with the corresponding inner step shoulder of the inner cavity of the locking connector.
  • the other is:
  • the locking connector has a stepped inner cavity, wherein the one cavity has an inner chord plane corresponding to the outer chord plane of the front section of the needle seat, and the front end of the outer chord plane of the front section of the needle seat blindly forms an outer stepped shoulder.
  • the step shoulder is matched with the corresponding inner step shoulder of the inner cavity of the locking connector, and after the needle is withdrawn, the inner and outer step shoulders are moved backwards of the front section of the stop needle seat, and a convex card point is arranged on the outer chord plane, the convex card The point is located at a distance behind the outer stepped shoulder, and a sliding slot extends in the inner chord plane.
  • the rear end of the sliding slot is open, but an elastic buckle is arranged at the opening, and the convex card point is sleeved in the sliding slot, after the needle is removed, The convex card point slides out of the elastic buckle backwards but is reversed by the elastic buckle.
  • the needle seat is composed of a needle bar and a needle seat body, and the needle bar is a cylindrical rod shape, and the rear end of the needle bar is fixed to the front end of the blood returning body of the needle seat body.
  • the hole cavity, the front part of the needle rod inner cavity is a fixed needle point glue point, the back section is a blood passage passage, which is connected with the blood return chamber of the needle seat, and a pin hole is used between the glue point and the blood passage channel.
  • the front section of the needle seat is located on the needle bar.
  • the needle base body is made of a transparent or translucent material, and is composed of an operating handle and a blood returning cartridge body.
  • the rear part of the needle seat is located on the needle seat body, and the operating handle is integrally connected with the blood returning warehouse body through the connecting rib;
  • the outer circumference is a stepped body, the small end portion is inserted into the inner cavity of the locking connector, and the cross-sectional shape of the small-end inner cavity fixing hole is similar to the shape of the outer cross section of the needle bar for fixing the needle bar, the big head
  • the inner periphery of the end is provided with an inner chord plane, and the plane position is on the same side of the elastic convex card on the wrapping sleeve, and is used for avoiding the top surface of the bump.
  • the inner cavity of the big end end is a blood chamber, and the inner cavity of the needle rod is communicated through the liquid passing hole.
  • the present invention has the following advantages over the prior art: the strength of the needle tube material and the manufacturing process are relatively low, the use is convenient, the protective sleeve is short, the operation is convenient, the structure is simple, and the manufacturing is convenient.
  • Figure 1 is a schematic view of an open type indwelling needle in the prior art
  • Figure 2 is a schematic front view showing the structure of a safety needle type open indwelling needle according to the present invention
  • Figure 3 is a schematic cross-sectional view showing the structure of a safety needle type open indwelling needle of the present invention
  • Figure 4 is a schematic perspective view of the structure of the wrapping sleeve
  • Figure 5 is a schematic perspective view of another wrapping direction of the wrapping sleeve structure
  • Figure 6 is a perspective sectional view of the wrapping sleeve
  • Figure 7 is a schematic perspective view of the structure of the locking connector;
  • Figure 8 is a left side view of the locking connector;
  • Figure 9 is a perspective cross-sectional view of the locking connector;
  • Figure 10 is a schematic perspective view of a needle bar structure
  • Figure 11 is a perspective cross-sectional view of the needle bar
  • Figure 12 is a schematic perspective view of the structure of the hub body;
  • Figure 13 is a schematic perspective view of the body of the needle hub in another axial direction;
  • Figure 14 is a right side view of the hub body;
  • Figure 15 is a front cross-sectional view of the hub body;
  • Figure 16 is a needle Left body view of the seat;
  • Figure 17 is a schematic view showing the assembled state of a safety needle type open indwelling needle of the present invention.
  • Figure 18 is a schematic view showing the needle withdrawal state of a safety needle type open indwelling needle according to the present invention.
  • Figure 19 is a schematic view showing the needle bar in a stopped state with respect to the locking connector when the needle is withdrawn;
  • Figure 20 is a schematic view showing the locking connector in a stopped state with respect to the wrapping sleeve when the needle is withdrawn;
  • Figure 21 is a partial enlarged view of Figure 20;
  • Figure 22 is a schematic perspective view of the wrapping sleeve structure
  • Figure 23 is a perspective sectional view of the wrapping sleeve
  • Figure 24 is a schematic perspective view showing the structure of the locking connector
  • Figure 25 is a schematic perspective view showing the structure of the locking connector of another axial direction
  • Figure 26 is a left side view of the locking connector
  • Figure 27 is a schematic view of the needle withdrawal state in the front view direction
  • Figure 28 is a schematic view of the needle withdrawal state in the top view direction
  • Figure 29 is a schematic perspective view of the structure of the wrapped sleeve
  • Figure 30 is a schematic perspective view of the front section of the wrapped sleeve
  • Figure 31 is a wrapped sleeve
  • Figure 32 is a perspective view of the front part of the wrapped sleeve
  • Figure 33 is a schematic perspective view of the structure of the wrapped sleeve body
  • Figure 34 is a schematic perspective cross-sectional view of the structure of the wrapped sleeve;
  • Figure 35 is a schematic view showing the state of the needle withdrawal
  • Figure 36 is a schematic cross-sectional view showing the structure of a safety needle type open indwelling needle according to the present invention.
  • Figure 37 is a schematic perspective view of a needle bar structure
  • Figure 38 is a schematic perspective cross-sectional view of a needle bar structure
  • Figure 39 is a schematic perspective view of the locking connector structure;
  • Figure 40 is a right side view of the locking connector;
  • Figure 41 is a front view of the locking connector;
  • Figure 42 is a schematic perspective view showing the structure of the hub body;
  • Figure 42 is a front cross-sectional view of the hub body;
  • Fig. 44 is a schematic view showing the state of the needle withdrawal in the front view; and Fig. 45 is a view showing the state of the needle withdrawal in the plan view.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a forward needle bar safety open indwelling needle is comprised of a catheter assembly 1, a forward needle bar puncture assembly 3 and a needle wrap sleeve assembly 4.
  • the forward needle bar puncture assembly 3 is comprised of a hub body 3.1, a needle bar 3.2 and a needle cannula 3.3;
  • the needle cannula cannula assembly 4 is comprised of a wrap sleeve 4.1 and a locking connector 4.2.
  • the wrapping sleeve 4.1 is composed of a short front tube 4.1.1, a curved piece 4.1.2, a long rear tube 4.1.3, an elastic convex card 4.1.4, a sliding slot 4.1.5, and a lumen. 4.1.6 Composition.
  • the front end has a symmetrical or single curved piece 4.1.2, and the curved piece 4.1.2 is inserted between the two fixed lugs at the rear end of the catheter seat to prevent the catheter needle from rotating when the indwelling needle is punctured, and the arc A convex card 4.1.2.1 is provided at the inner corner of the leading edge of the blade to facilitate hooking the outer peripheral flange of the rear end of the catheter seat so that the wrapping sleeve is always connected to the catheter assembly before the indwelling needle is withdrawn.
  • the elastic convex card bump 4.1.4.1 is arranged inside the elastic arm for locking the locking connector after the needle is withdrawn.
  • the sliding slot 4.1.5 is distributed on one side, extending in the axial direction and opening at the rear end.
  • the locking connector is a stepped tube having a front small tube 4.2.1 and a rear tube 4.2.2.
  • the elastic convex card 4.2.3 bump 4.2.3.1 is set on the inner side of the elastic arm, after withdrawing the needle tube, it is used to resist the front end face of the front needle bar, restricting the forward needle bar to move forward; rectangular through hole 4.2.4 Connecting with the inner cavity of the locking connector, after withdrawing the needle tube, for engaging the convex point 4.1.4.1 of the elastic convex card 4.1.4 on the wrapping sleeve 4.1, restricting the locking connecting piece from moving forward; locking the inner cavity of the connecting piece 4.2.5 is a stepped inner cavity, the inner cavity of the stepped shoulder wall has an inner chord plane 4.2.5.1, on the same side as the elastic convex card 4.2.3, the plane and the elastic convex card 4.2.3 upper bump 4.2.3.1 The top surface is flush.
  • the hub is comprised of a needle bar 3.2 and a hub body.
  • the needle bar 3.2 is a cylindrical rod shape having a long internal chord plane 3.2.2 on the cylindrical surface thereof.
  • the cylindrical surface forms a stepped shoulder 3.2.1.1, the inner chord plane and the structural plane on the locking joint 4.2.5.1 fit and slide and stop; the step shoulder 3.2.1.1 is used for the needle after the needle is withdrawn, and the stepped shoulder on the locking connector 4.2.2.1 Touch stop, the back end of the needle bar is fixed to the needle back to the blood volume body 3.1.3 front fixed hole 3.1.5; the front part of the needle bar inner cavity is a fixed needle point, the back is a pass The blood channel is connected with the 3.1 blood bank on the needle body, and a pin hole is formed between the glue point and the blood passage for inserting the needle 3.3.
  • the needle holder 3.1 is made of a transparent or translucent material, which is convenient for observing the puncture and returning blood. It is connected by the vertical pusher 3.1.1 and the side pusher 3.1.2 into the integral operation handle 3.1.1. And the blood returning body 3.1.3, the operating handle is connected with the blood returning body through the connecting rib 3.1.4; the outer blood chamber of the blood returning chamber is a stepped rotating body, and the small head end portion is inserted into the large inner cavity of the locking connecting piece, the small head end
  • the inner cavity fixing hole 3.1.5 has a cross-sectional shape similar to that of the outer circumference of the needle bar 3.2, and is used for fixing the needle bar.
  • the outer end of the large end is provided with an inner chord plane 3.1.3.1, and the plane position and the elastic of the wrapping sleeve The same side of the convex card is used to avoid the top surface of the bump, and the inner cavity of the large end end is a blood chamber, which is connected with the inner cavity of the needle bar through the liquid passage 3.1.7.
  • the puncture assembly is assembled. First, the needle tube is fixed to the needle bar.
  • the needle puncture slope is substantially the same side as the inner chord plane of the needle bar, and then the small end of the locking connector is inserted into the needle bar toward the needle tube, and then Insert the needle bar into the fixing hole on the needle seat and fix it by dispensing.
  • the open end of the sliding slot of the wrapping sleeve is directed toward the needle seat, and the needle tube, the needle bar and the locking connector are sleeved, and the sliding slot runs along the connecting rib on the needle seat until the rear of the needle seat slides until the wrapping sleeve
  • the required catheter assembly is sleeved, and the rear end of the catheter assembly is inserted into the front frustum of the wrapping sleeve and the annular gap between the curved piece and the frustum.
  • the convex clip on the curved piece hooks the rear end flange of the catheter seat, and finally the venting plug is inserted into the open end of the blood chamber on the needle seat, that is, the indwelling needle assembly is completed, as shown in FIG.
  • the needle holder is pulled to drive the piercing assembly away from the catheter assembly, the puncture assembly is gradually moved backward along the inner cavity of the wrapping sleeve, the needle seat slides out of the wrapping sleeve, and then the needle bar gradually exposes the sleeve.
  • the stepped shoulder at the front end of the needle bar touches the elastic convex card on the locking connector to drive the connecting member to slide in the sleeve, and the connecting member moves to the end face of the needle bar to contact the elastic convex card on the sleeve, and then continues to pull.
  • the needle seat, the cylindrical protruding portion of the front end of the needle bar climbs over the elastic convex card, the cylindrical convex portion enters the locking card slot, the front end surface of the needle bar touches the rear end surface of the elastic convex card, and the needle bar step shoulder also connects with the connecting piece
  • the outer step surface is in contact with the latch, so that the needle bar is in a stopped state with respect to the connecting member, as shown in FIG.
  • the large cylindrical surface of the connecting member also climbs over the elastic convex card on the sleeve, and the convex point on the elastic convex card slides into the rectangular hole in the big part of the connecting piece, and the vertical front and back of the convex convex card bumps with the rectangular hole wall.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the manner in which the wrapping sleeve and the locking connector are snap-fastened may also be a snap ring and a male snap.
  • the elastic convex card on the wrapping sleeve can be as shown in Figs. 1 and 2, and the locking convex card is composed of two convex cards 4.1.6 and 4.1.7 having a certain axial distance, and the top surface of the convex card is higher than the outer surface of the sleeve.
  • the two convex cards may be on the same straight line or may be arranged offset around the axial direction, and the locking connecting members are arranged as shown in Figures 3, 4 and 5, and a rectangular section ring 4.2.6 is arranged at a certain distance from the outer peripheral surface of the large end.
  • the ring and the outer periphery of the connecting piece are integrally connected by the ribs 4.2.7.
  • the vertical convex surface of the front convex card on the wrapping sleeve touches the front vertical surface of the locking connector ring, and the locking locking connector moves forward, and the rear convex card vertical surface and the locking on the wrapping sleeve
  • the rear side of the connecting piece ring touches the stop, and the stop locking connector slides out of the wrapping sleeve, as shown in Figs.
  • the slot on the wrapping sleeve can be restricted to open, which can greatly reduce the amplitude of the needle bar, making the needle tube more reliable.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the wrap sleeve may be of a split configuration consisting of the front section 4.1.8 and the body 4.1.9.
  • the front section is provided with a step fastening hole 4.1.8.1 and a corresponding fastening socket 4.1.8.2.
  • the front end of the main body is provided with a fastening convex card 4.1.9.1 which is matched with the step fastening hole 4.1.8.1 and the fastening socket 4.1.8.2, and is fastened by the fastening socket 4.1.8.2 and the step fastening hole 4.1.8.1. .
  • the outer end of the outer ring is provided with a shoulder that can block the detachment of the ring.
  • 4.1.9.1 constitutes a stop flange card
  • the tail end of the sliding slot on the body has an elastic buckle 4.1.9.2 as a stop elastic card
  • the distance between the elastic buckle and the shoulder is matched with the thickness of the ring 4.2.6 (see FIG. 24).
  • the locking connector has a stepped inner cavity, wherein the intermediate cavity has an inner chord plane corresponding to the outer chord plane of the needle bar, and the outer end of the outer chord plane of the needle bar is blindly formed.
  • An outer stepped shoulder the stepped shoulder is matched with the corresponding inner stepped shoulder of the inner cavity of the locking connector, and after the needle is withdrawn, the inner and outer stepped shoulders are moved back to the front of the stop needle seat, and a convex card is arranged on the outer chord plane Point, the convex card point is located at a distance behind the outer stepped shoulder, and a sliding slot extends in the inner chord plane.
  • the rear end of the sliding slot is open, but an elastic buckle is arranged at the opening, and the convex card point is sleeved in the sliding slot. After the needle is withdrawn, the convex card point slides out of the elastic buckle backwards but is reversed by the elastic buckle.

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Abstract

一种前伸针杆安全型开放式留置针，其导管座具有前内腔和后内腔，导管插置在前内腔中，针座包括前段和后段，前段套装在导管座后内腔中，针座后段露在导管座外，针管（3.3）后端插接于针座，针管（3.3）内腔孔与针座后段回血腔联通，针管（3.3）依序穿过导管座内腔和导管前端后，针尖露出导管尖端，针座前段呈一种长杆状，从导管座后端面一直向前延伸插置到或者插置接近到导管座前后内腔的接合部，插置深度大于导管座后内腔长度的四分之三。留置针具有如下优点：针管（3.3）材料强度以及制造工艺要求相对较低，使用方便，保护套较短，便于操作并且结构较简单、便于制造。

Description

前伸针杆安全型开放式留置针 技术领域
本发明涉及一种留置针，特别是一种前伸针杆安全型开放式留置针。
背景技术
现有技术中一种开放式留置针如图1所示，其由导管组件1、穿刺组件2组成，其中穿刺组件由穿刺针管2.1和针座2.2构成，导管组件1由导管以及导管座组成。导管座具有前内腔和后内腔，导管插置在前内腔中。针管依序穿过导管组件后内腔和前内腔最后穿出导管前端，针尖露出导管尖端，针管后端插接于针座，针管内腔孔与针座后段回血腔联通，而针座前端短锥台插接于导管组件后内腔尾段，插入导管座内腔深度较浅，不到导管座后内腔长度四分之一。这样所需针管长度较长。导致如下两个不足之处：对针管材料强度以及制造工艺要求较高；如果需要留置针使用后要包裹受血液污染的针管，所需包裹用的保护套就会比较长，而这样的保护套又需预装配于针座后部，以便撤出针管过程中，能自动及时包裹针管，如此配置长套管对留置针穿刺血管时会产生阻碍，不便使用操作。
发明内容
本发明的目的在于克服现有技术中的不足之处，而提供一种针管材料强度以及制造工艺要求相对较低的、使用方便的前伸针杆安全型开放式留置针，本发明的进一步目的在于提供一种保护套较短、从而便于操作的前伸针杆安全型开放式留置针。
本发明的目的是通过以下途径来实现的。
前伸针杆安全型开放式留置针，包括导管组件和穿刺组件，其中穿刺组件包括穿刺针管和针座，导管组件包括导管以及导管座，导管座具有前内腔和后内腔，导管插置在前内腔中，针座包括前段和后段，前段套装在导管座后内腔中，针座后段露在导管座外，针管后端插接于针座，针管内腔孔与针座后段回血腔联通，针管依序穿过导管座内腔和导管前端后，针尖露出导管尖端，其结构要点在于：针座前段呈一种长杆状，从导管座后端面一直向前延伸插置到或者插置接近到导管座前后内腔的接合部，插置深度大于导管座后内腔长度的四分之三。
这样，裸露在针座外的针管长度得以大幅度减少。而另外一个出乎意料的效果是：向前延伸的针座前段是可以与外壁构造实现滑套连接的，这意味着被针座前段替代的一部分针管长度可以通过滑套连接实现伸缩。
本发明的目的还可以通过以下途径来实现。
还包括一种针管包裹套管组件，其前端与导管座后端卡扣连接，针座后段含套在该针管包裹套管组件内腔中，裸露在针管包裹套管组件外的操作手柄穿过该组件侧壁上轴向延伸的滑动槽缝与针座连接，滑动槽缝后端开口，当针座后段以及针座前段经由此开口滑出针管包裹套管组件外，针座前端通过一种进退锁止的卡扣装置与包裹套管组件卡固连接。
针管包裹套管组件是一种保护套组件，用于包裹穿刺完毕后脱离导管座的针管以避免其裸露。保护套组件现有技术中常见。
由于被针座前段替代的一部分针管长度可以通过滑套连接实现伸缩并最终得以延伸到保护套以外，从而缩短了保护套的所需包裹长度，这样，或者缩短了保护套的整体长度或者简化了伸缩性多重保护套的构造。
在本发明中，对于该针管包裹套管组件的进一步优选是：
针管包裹套管组件包括包裹套管和锁定连接件，包裹套管前端与导管座后端卡扣连接，滑动槽缝沿其侧壁轴向延伸至后端开口，锁定连接件与包裹套管滑套连接，滑动至包裹套管后端的锁定连接件与包裹套管后端的弹性凸卡卡扣连接，针座前段滑套连接在此锁定连接件的内腔中，进退锁止的卡扣装置位于针座前段与此锁定连接件之间。
关于弹性凸卡卡扣连接的进一步优选是：
一种是：
锁定连接件滑套连接在包裹套管内腔中，弹性凸卡具有弹性臂，弹性臂位于包裹套管上，卡扣用的的凸点设置于弹性臂内侧，用于撤出针管后卡入对应匹配的通孔中或者凹槽中，限制锁定连接件往前窜动，此通孔或者凹槽位于锁定连接件后部。
另一种是：
锁定连接件由本体、圆环和筋条组成，圆环环围在本体外并通过径向的筋条连接成一体，筋条与滑动槽缝对应匹配，本体滑套连接在包裹套管内腔中，圆环滑套连接在包裹套管外周壁上，滑动至包裹套管后端的锁定连接件与包裹套管后端的弹性凸卡卡扣连接位于此圆环和包裹套管之间。
连接件上圆环在各杆件锁定后，还可以起到限制包裹套管上槽缝张开，可令针座前段人为摆动幅度大幅减小，使得更可靠包裹针管。
关于设置在此圆环和包裹套管之间的该弹性凸卡卡扣连接的进一步优选是：
一种是：
包裹套管与锁定连接件弹性凸卡卡扣连接还可以是一种卡环与凸卡扣接，包裹套管上弹性凸卡由两个具有一定轴向距离凸卡构成，凸卡顶面高出套管外表面，两凸卡或者是同一直线上， 或者是绕轴向错位设置，圆环前后面各设置一矩形截面，在留置针撤针后，包裹套管上前凸卡竖立面与锁定连接件圆环前竖立面碰触，在于止动锁定连接件往前移动，而包裹套管上后凸卡竖立面与锁定连接件圆环后竖立面碰触，在于止动锁定连接件滑出包裹套管。
另一种是：
包裹套管外圈的尾端部设置有可阻挡圆环脱离的轴肩，位于此包裹套管上的滑动槽缝的尾端具有弹性卡扣，此弹性卡扣与该轴肩的距离与圆环厚度具有容纳匹配。
因为这样的容纳匹配，圆环可以陷落在此轴肩与弹性卡扣之间，从而使留置针撤针结束时，锁定连接件相对此包裹套管进退不得。
关于包裹套管的进一步优选是：
包裹套管前段具有或者是一对称或者是单一弧形片，弧形片插接于导管座后端两个紧定凸耳之间，用于防止留置针在穿刺时导管座转动，该包裹套管前段或者是与包裹套管本体一体构造，或者是与包裹套管本体分体构造，当分体构造时，本体与包裹套管前段弹性插扣连接。
圆弧片前缘内侧边角处设有凸卡，便于勾住导管座后端外周凸缘，使得在留置针撤针未结束之前保持包裹套管一直与导管组件连接在一起。
关于进退锁止的卡扣装置的进一步优选是：
一种是：
锁定连接件内腔具有一弹性凸卡，凸点设置于弹性臂内侧，在撤出针管后，用于抵住针座前段前端面，限制针座前段往前窜动，锁定连接件具有阶梯形内腔，其中一孔腔具有一内弦平面，此内弦平面与针座前段的外弦平面匹配对应，该内弦平面与弹性凸卡在同侧，且平面与弹性凸卡上凸点顶面平齐，针座前段的外弦平面前端盲止形成一外阶梯肩，此外阶梯肩与锁定连接件内腔的对应内阶梯肩匹配，针管撤针后，该内外阶梯肩碰触止动针座前段的后移。
另一种是：
锁定连接件具有阶梯形内腔，其中一孔腔具有一内弦平面，此内弦平面与针座前段的外弦平面匹配对应，针座前段的外弦平面前端盲止形成一外阶梯肩，此外阶梯肩与锁定连接件内腔的对应内阶梯肩匹配，针管撤针后，该内外阶梯肩碰触止动针座前段的后移，外弦平面上设置有一种凸卡点，此凸卡点位于外阶梯肩后方一距离，内弦平面上延伸一滑动槽，此滑动槽后端开口，但在开口处设置弹性卡扣，凸卡点滑套在此滑动槽中，撤针结束后，凸卡点向后滑出此弹性卡扣但被此弹性卡扣前行逆止。
关于针座的进一步优选是：
针座由针杆和针座本体组成，针杆是一圆柱杆形，针杆后端固接于针座本体回血仓体前端固 接孔腔，针杆内腔前段是一固针点胶穴，后段是一过血通道，与针座上回血仓联通，在点胶穴与过血通道之间是一插针孔，用于插接针管，所说的针座前段位于针杆上。
针座本体由透明或半透明材料制成，其由操作手柄和回血仓体组成，所说的针座后段位于针座本体上，操作手柄通过连接筋与回血仓体连成一体；回血仓体外周是一阶梯回转体，小头端部分插入锁定连接件大头内腔，小头端内腔固接孔横截面形状是一与针杆外周横截面形状相仿，用于固接针杆，大头端外周设有一内弦平面，平面位置与包裹套管上弹性凸卡同侧，用于避开凸点顶面，大头端内腔是一回血腔，通过过液孔与针杆内腔联通。
综上所述，本发明相比现有技术具有如下优点：针管材料强度以及制造工艺要求相对较低，使用方便，保护套较短，便于操作并且结构较简单、便于制造。
附图说明
图1是现有技术中一种开放式留置针示意图；
图2是本发明所述一种前伸针杆安全型开放式留置针的结构示意主视图；
图3是本发明所述一种前伸针杆安全型开放式留置针的结构示意剖视图；
图4是包裹套管结构示意立体图；图5是另一种轴测方向的包裹套管结构示意立体图；图6是包裹套管立体剖视图；
图7是锁定连接件结构示意立体图；图8是锁定连接件左视图；图9是锁定连接件立体剖视图；
图10是针杆结构示意立体图；图11是针杆立体剖视图；
图12是针座本体结构示意立体图；图13是另一种轴测方向的针座本体结构示意立体图；图14是针座本体右视图；图15是针座本体主视剖视图；图16是针座本体左视图；
图17是本发明所述一种前伸针杆安全型开放式留置针的装配状态示意图；
图18本发明所述一种前伸针杆安全型开放式留置针的撤针状态示意图；
图19是撤针时针杆相对于锁定连接件处于止动状态的示意图；
图20是撤针时锁定连接件相对于包裹套管处于止动状态的示意图；图21是图20的局部放大图；
图22是包裹套管结构示意立体图；图23是包裹套管立体剖视图；
图24是锁定连接件结构示意立体图；图25是另一种轴测方向的锁定连接件结构示意立体图；
图26是锁定连接件左视图；
图27是主视方向的撤针状态示意图；图28是俯视方向的撤针状态示意图；
图29是包裹套管结构示意立体图；图30是包裹套管前段结构示意立体图；图31是包裹套 管前段结构示意立体剖视图；图32是包裹套管前段左视图；图33是包裹套管本体结构示意立体图；图34是包裹套管结构示意立体剖视图；
图35是撤针状态示意图；
图36是本发明所述一种前伸针杆安全型开放式留置针的结构示意剖视图；
图37是针杆结构示意立体图；图38是针杆结构示意立体剖视图；
图39是锁定连接件结构示意立体图；图40是锁定连接件右视图；图41是锁定连接件主视图；
图42是针座本体结构示意立体图；图42是针座本体主视剖视图；
图44是主视方向的撤针状态示意图；图45是俯视方向的撤针状态示意图。
下面结合附图对本发明进行更详尽的描述。
具体实施方式
实施例一：
参照图2，前伸针杆安全型开放式留置针，其由导管组件1、前伸针杆式穿刺组件3和针管包裹套管组件4组成。
参照图3，其中前伸针杆式穿刺组件3由针座本体3.1、针杆3.2和针管3.3组成；针管包裹套管组件4由包裹套管4.1和锁定连接件4.2组成。
参照图4、5、6，包裹套管4.1由短前管4.1.1、弧形片4.1.2、长后管4.1.3、弹性凸卡4.1.4、滑动槽缝4.1.5以及内腔4.1.6组成。其前端具有一对称或单一弧形片4.1.2，弧形片4.1.2插接于导管座后端两个紧定凸耳之间，用于防止留置针在穿刺时导管座转动，而弧形片前缘内侧边角处设有凸卡4.1.2.1，便于勾住导管座后端外周凸缘，使得在留置针撤针未结束之前保持包裹套管一直与导管组件连接在一起。弹性凸卡凸点4.1.4.1设置于弹性臂内侧，用于撤出针管后锁定锁定连接件。滑动槽缝4.1.5单侧分布，沿轴向延伸，后端开口。
参照图7、8.、9，锁定连接件是一阶梯管，具有前小管4.2.1和后管4.2.2。弹性凸卡4.2.3凸点4.2.3.1设置于弹性臂内侧，在撤出针管后，用于抵住前伸针杆前端面，限制前伸针杆往前窜动；矩形通孔4.2.4与锁定连接件内腔联通，在撤出针管后，用于卡入包裹套管4.1上弹性凸卡4.1.4的凸点4.1.4.1，限制锁定连接件往前窜动；锁定连接件内腔4.2.5是一阶梯形内腔，在阶梯肩壁处孔腔有一内弦平面4.2.5.1，与弹性凸卡4.2.3在同侧，平面与弹性凸卡4.2.3上凸点4.2.3.1顶面平齐。
参照图10-图16，针座由针杆3.2和针座本体组成。
参照图10和图11，针杆3.2是一圆柱杆形，其圆柱面上设有一长段内弦平面3.2.2， 自然与圆柱面形成一阶梯肩3.2.1.1，内弦平面与锁定连接件上构造平面4.2.5.1配合滑动并止转；阶梯肩3.2.1.1用于针管撤针后，与锁定连接件上阶梯肩4.2.2.1碰触止动，针杆后端固接于针座回血仓体3.1.3前端固接孔腔3.1.5；针杆内腔前段是一固针点胶穴，后段是一过血通道，与针座本体上3.1回血仓联通，在点胶穴与过血通道之间是一插针孔，用于插接针管3.3。
参照图12、13、14、15、16，针座3.1由透明或半透明材料制成，方便观察穿刺回血，其由立推手3.1.1与侧推手3.1.2连成一体操作手柄3.1.1和回血仓体3.1.3组成，操作手柄通过连接筋3.1.4与回血仓体连成一体；回血仓体外周是一阶梯回转体，小头端部分插入锁定连接件大头内腔，小头端内腔固接孔3.1.5横截面形状是一与针杆3.2外周横截面形状相仿，用于固接针杆，大头端外周设有一内弦平面3.1.3.1，平面位置与包裹套管上弹性凸卡同侧，用于避开凸点顶面，大头端内腔是一回血腔，通过过液孔3.1.7与针杆3.2内腔联通。
留置针装配：
如图17所示，穿刺组件装配，首先针管与针杆固接，针管穿刺斜面与针杆上内弦平面大致同侧，然后将锁定连接件小头端朝向针管方向套入针杆，之后再将针杆插入针座上固接孔，点胶固接。接着将包裹套管的滑动槽缝开口端朝向针座，套过针管、针杆及锁定连接件，滑动槽缝顺过针座上连接筋，一直往针座后部滑移，直到包裹套管上弧形片后端面与针座上立推手前端面碰触为止，再套接所需导管组件，将导管组件后端插入包裹套管前端锥台及弧形片与锥台间环隙，将弧形片上凸卡勾住导管座后端凸缘，最后在针座上回血腔开口端塞入排气塞，即完成了留置针装配，如图3所示。
留置针使用：
在留置针穿刺置管成功后，拉动针座，带动穿刺组件远离导管组件，穿刺组件顺着包裹套管内腔逐渐后移，针座滑出包裹套管，接着针杆也逐渐露出套管，当针杆前端阶梯肩碰触锁定连接件上弹性凸卡，带动连接件在套管内滑移，连接件随着针杆后移至大头端面与套管上弹性凸卡碰触，这时，继续拉动针座，针杆前端圆柱凸起部分爬过弹性凸卡，圆柱凸起部分进入止动卡槽内，针杆前端面与弹性凸卡后端面碰触卡止，针杆阶梯肩也与连接件外周阶梯面碰触卡止，如此针杆相对于连接件处于止动状态，如图19所示。同时，连接件上大头圆柱面也爬过套管上弹性凸卡，弹性凸卡上凸点滑入连接件大头上矩形孔内，弹性凸卡凸点前后垂直面与矩形孔壁相互碰触，止动了连接件的滑移，如图20、21所示。继续拉动针座，令套管前端弧形片上凸卡与导管组件分离，如图18所示。至此，完成了撤出针管，针管也完全包裹在套管内。
本实施例未述部分与现有技术相同。
实施例二：
参照图22-图28，包裹套管与锁定连接件止动扣接方式还可以是一种卡环与凸卡扣接。
包裹套管上弹性凸卡可以如图1、2所示，止动凸卡由两个具有一定轴向距离凸卡4.1.6、4.1.7构成，凸卡顶面高出套管外表面，两凸卡可以是同一直线上，也可以绕轴向错位设置，而锁定连接件如图3、4、5所示，在离大头端外周表面一定间距设置一矩形截面圆环4.2.6，圆环与连接件外周通过筋条4.2.7连接成一体。在留置针撤针后，包裹套管上前凸卡竖立面与锁定连接件圆环前竖立面碰触，在于止动锁定连接件往前移动，而包裹套管上后凸卡竖立面与锁定连接件圆环后竖立面碰触，在于止动锁定连接件滑出包裹套管，如图6、7所示。
锁定连接件上圆环在各杆件锁定后，还可以起到限制包裹套管上槽缝张开，可令针杆人为摆动幅度大幅减小，使得更可靠包裹针管。
本实施例未述部分与实施例一相同。
实施例三：
参照图29-图35，包裹套管可以是分体式构造，由前段4.1.8和本体4.1.9组成。前段上设置有阶梯扣接孔4.1.8.1和对应的扣接插孔4.1.8.2,。本体前端设置有扣接凸卡4.1.9.1与该阶梯扣接孔4.1.8.1以及扣接插孔4.1.8.2对应匹配，并通过扣接插孔4.1.8.2与阶梯扣接孔4.1.8.1扣接。本体外圈的尾端部设置有可阻挡圆环脱离的轴肩4.1.9.1构成止动凸缘卡，位于此本体上的滑动槽缝的尾端具有弹性卡扣4.1.9.2作为止动弹性卡，此弹性卡扣与该轴肩的距离与圆环4.2.6(见图24)厚度具有容纳匹配。从而当撤针时，锁定连接件上的圆环恰好陷落其中，处于前后均被限位的状态，如图35所示。
本实施例未述部分与实施例二相同。
最佳实施例：
参照图36-图45，锁定连接件具有阶梯形内腔，其中间孔腔具有一内弦平面，此内弦平面与针杆的外弦平面匹配对应，针杆的外弦平面前端盲止形成一外阶梯肩，此外阶梯肩与锁定连接件内腔的对应内阶梯肩匹配，针管撤针后，该内外阶梯肩碰触止动针座前段的后移，外弦平面上设置有一种凸卡点，此凸卡点位于外阶梯肩后方一距离，内弦平面上延伸一滑动槽，此滑动槽后端开口，但在开口处设置弹性卡扣，凸卡点滑套在此滑动槽中，撤针结束后，凸卡点向后滑出此弹性卡扣但被此弹性卡扣前行逆止。
本实施例未述部分与实施例二相同。

Claims (12)

  1. 前伸针杆安全型开放式留置针，包括导管组件和穿刺组件，其中穿刺组件包括穿刺针管和针座，导管组件包括导管以及导管座，导管座具有前内腔和后内腔，导管插置在前内腔中，针座包括前段和后段，前段套装在导管座后内腔中，针座后段露在导管座外，针管后端插接于针座，针管内腔孔与针座后段回血腔联通，针管依序穿过导管座内腔和导管前端后，针尖露出导管尖端，其特征在于：针座前段呈一种长杆状，从导管座后端面一直向前延伸插置到或者插置接近到导管座前后内腔的接合部，插置深度大于导管座后内腔长度的四分之三。
  2. 根据权利要求1所述的前伸针杆安全型开放式留置针，其特征在于：还包括一种针管包裹套管组件，其前端与导管座后端卡扣连接，针座后段含套在该针管包裹套管组件内腔中，裸露在针管包裹套管组件外的操作手柄穿过该组件侧壁上轴向延伸的滑动槽缝与针座连接，滑动槽缝后端开口，当针座后段以及针座前段经由此开口滑出针管包裹套管组件外，针座前端通过一种进退锁止的卡扣装置与包裹套管组件卡固连接。
  3. 根据权利要求2所述的前伸针杆安全型开放式留置针，其特征在于：针管包裹套管组件包括包裹套管和锁定连接件，包裹套管前端与导管座后端卡扣连接，滑动槽缝沿其侧壁轴向延伸至后端开口，锁定连接件与包裹套管滑套连接，滑动至包裹套管后端的锁定连接件与包裹套管后端的弹性凸卡卡扣连接，针座前段滑套连接在此锁定连接件的内腔中，进退锁止的卡扣装置位于针座前段与此锁定连接件之间。
  4. 根据权利要求3所述的前伸针杆安全型开放式留置针，其特征在于：锁定连接件滑套连接在包裹套管内腔中，弹性凸卡具有弹性臂，弹性臂位于包裹套管上，卡扣用的的凸点设置于弹性臂内侧，用于撤出针管后卡入对应匹配的通孔中或者凹槽中，限制锁定连接件往前窜动，此通孔或者凹槽位于锁定连接件后部。
  5. 根据权利要求3所述的前伸针杆安全型开放式留置针，其特征在于：锁定连接件由本体、圆环和筋条组成，圆环环围在本体外并通过径向的筋条连接成一体，筋条与滑动槽缝对应匹配，本体滑套连接在包裹套管内腔中，圆环滑套连接在包裹套管外周壁上，滑动至包裹套管后端的锁定连接件与包裹套管后端的弹性凸卡卡扣连接位于此圆环和包裹套管之间。
  6. 根据权利要求3所述的前伸针杆安全型开放式留置针，其特征在于：包裹套管与锁定连接件弹性凸卡卡扣连接还可以是一种卡环与凸卡扣接，包裹套管上弹性凸卡由两个具有一定轴向距离凸卡构成，凸卡顶面高出套管外表面，两凸卡或者是同一直线上，或者是绕轴向错位设置，圆环前后面各设置一矩形截面，在留置针撤针后，包裹套管上前凸卡竖立面与锁定连接件圆环前竖立面碰触，在于止动锁定连接件往前移动，而包裹套管上后凸卡竖立面与锁定连接件圆环后竖立面碰触，在于止动锁定连接件滑出包裹套管。
  7. 根据权利要求3所述的前伸针杆安全型开放式留置针，其特征在于：包裹套管外圈的尾端部设置有可阻挡圆环脱离的轴肩，位于此包裹套管上的滑动槽缝的尾端具有弹性卡扣，此弹性卡扣与该轴肩的距离与圆环厚度具有容纳匹配。
  8. 根据权利要求2所述的前伸针杆安全型开放式留置针，其特征在于：包裹套管前段具有或者是一对称或者是单一弧形片，弧形片插接于导管座后端两个紧定凸耳之间，用于防止留置针在穿刺时导管座转动，该包裹套管前段或者是与包裹套管本体一体构造，或者是与包裹套管本体分体构造，当分体构造时，本体与包裹套管前段弹性插扣连接。
  9. 根据权利要求1所述的前伸针杆安全型开放式留置针，其特征在于：锁定连接件内腔具有一弹性凸卡，凸点设置于弹性臂内侧，在撤出针管后，用于抵住针座前段前端面，限制针座前段往前窜动，锁定连接件具有阶梯形内腔，其中一孔腔具有一内弦平面，此内弦平面与针座前段的外弦平面匹配对应，该内弦平面与弹性凸卡在同侧，且平面与弹性凸卡上凸点顶面平齐，针座前段的外弦平面前端盲止形成一外阶梯肩，此外阶梯肩与锁定连接件内腔的对应内阶梯肩匹配，针管撤针后，该内外阶梯肩碰触止动针座前段的后移。
  10. 根据权利要求1所述的前伸针杆安全型开放式留置针，其特征在于：锁定连接件具有阶梯形内腔，其中一孔腔具有一内弦平面，此内弦平面与针座前段的外弦平面匹配对应，针座前段的外弦平面前端盲止形成一外阶梯肩，此外阶梯肩与锁定连接件内腔的对应内阶梯肩匹配，针管撤针后，该内外阶梯肩碰触止动针座前段的后移，外弦平面上设置有一种凸卡点，此凸卡点位于外阶梯肩后方一距离，内弦平面上延伸一滑动槽，此滑动槽后端开口，但在开口处设置弹性卡扣，凸卡点滑套在此滑动槽中，撤针结束后，凸卡点向后滑出此弹性卡扣但被此弹性卡扣前行逆止。
  11. 根据权利要求1所述的前伸针杆安全型开放式留置针，其特征在于：针座由针杆和针座本体组成，针杆是一圆柱杆形，针杆后端固接于针座本体回血仓体前端固接孔腔，针杆内腔前段是一固针点胶穴，后段是一过血通道，与针座上回血仓联通，在点胶穴与过血通道之间是一插针孔，用于插接针管，所说的针座前段位于针杆上。
  12. 根据权利要求1所述的前伸针杆安全型开放式留置针，其特征在于：针座本体由透明或半透明材料制成，其由操作手柄和回血仓体组成，所说的针座后段位于针座本体上，操作手柄通过连接筋与回血仓体连成一体；回血仓体外周是一阶梯回转体，小头端部分插入锁定连接件大头内腔，小头端内腔固接孔横截面形状是一与针杆外周横截面形状相仿，用于固接针杆，大头端外周设有一内弦平面，平面位置与包裹套管上弹性凸卡同侧，用于避开凸点顶面，大头端内腔是一回血腔，通过过液孔与针杆内腔联通。
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