WO2021147811A1 - 一种带有屏蔽针偏心挡片的留置针 - Google Patents

一种带有屏蔽针偏心挡片的留置针 Download PDF

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Publication number
WO2021147811A1
WO2021147811A1 PCT/CN2021/072447 CN2021072447W WO2021147811A1 WO 2021147811 A1 WO2021147811 A1 WO 2021147811A1 CN 2021072447 W CN2021072447 W CN 2021072447W WO 2021147811 A1 WO2021147811 A1 WO 2021147811A1
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WO
WIPO (PCT)
Prior art keywords
needle
eccentric
hole
baffle
spring clip
Prior art date
Application number
PCT/CN2021/072447
Other languages
English (en)
French (fr)
Inventor
张洪杰
Original Assignee
贝普医疗科技有限公司
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Filing date
Publication date
Application filed by 贝普医疗科技有限公司 filed Critical 贝普医疗科技有限公司
Publication of WO2021147811A1 publication Critical patent/WO2021147811A1/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
    • A61M5/178—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
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • 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
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3213—Caps placed axially onto the needle, e.g. equipped with finger protection guards
    • 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
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M2005/3206—Needle or needle hub disconnecting devices forming part of or being attached to the hub or syringe 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
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3223—Means impeding or disabling repositioning of used needles at the syringe nozzle
    • 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
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3223—Means impeding or disabling repositioning of used needles at the syringe nozzle
    • A61M2005/3224—Means to disalign the needle tip and syringe nozzle

Definitions

  • the invention belongs to the technical field of indwelling needles, and in particular relates to an indwelling needle with an eccentric shielding needle.
  • indwelling needles are also designed with a needle tube retraction mechanism, but the structure of this needle tube retraction mechanism is not reliable enough, and the needle tip of the needle tube may extend again, which poses a safety hazard.
  • the present invention provides an indwelling needle with an eccentric shielding needle.
  • An indwelling needle with a shielding needle eccentric stopper including:
  • the needle guard has a cavity in the front part, a push rod guide hole communicating with the cavity is opened on the lower side of the side wall, a front port communicating with the cavity is opened on the front end surface, and a front port communicating with the cavity is opened in the rear part. Needle through hole penetrating along the axis;
  • the eccentric baffle is installed in the cavity of the needle guard and arranged along the radial surface.
  • the number is more than one. It is provided with an eccentric hole, and its rear end surface is provided with a plurality of circumferential sides of the eccentric hole.
  • Blind hole with more than 2 fulcrums on its outer contour;
  • the spring clip includes a front baffle part, a rear baffle part, a connecting part, and an elastic cantilever part.
  • the front baffle part is installed in the front part of the cavity of the needle guard and restricts the eccentric baffle axially forward,
  • the front baffle part is provided with a needle hole coaxial with the needle through hole of the needle protection sleeve, and the rear baffle part is installed in the rear part of the needle protection sleeve and divides the needle through hole of the needle protection sleeve into two sections.
  • the baffle part is provided with a stop pin hole coaxial with the needle through hole of the needle guard, the connecting part connects the front baffle part and the back baffle part, the elastic cantilever part is installed in the needle guard, and the elastic cantilever
  • the rear end of the part is connected with the rear baffle part, the front end of the elastic cantilever part is provided with a buckle and extends to the front port of the needle guard, and the elastic cantilever part is resisted upward by the eccentric baffle to produce elastic deformation;
  • Needle holder connected to the back of the needle guard
  • Needle tube the rear end of which extends from the front port of the needle guard, and passes through the needle hole of the spring clip, the eccentric hole of the eccentric stopper, the front section of the needle through hole of the needle guard, and the front part of the spring clip.
  • the front end of the needle is the needle tip and passes through the catheter holder assembly and is exposed.
  • Near the needle tip there are slots and annular protrusions arranged back and forth. ;as well as
  • the catheter base assembly includes a catheter base, a metal wedge, a catheter, and an isolation plug.
  • the rear part of the catheter base is installed in the front end of the needle guard, and the rear side wall of the catheter base is provided with a buckle that matches with the spring clip.
  • the outer diameter of the annular protrusion of the needle tube is larger than the stop needle hole of the spring clip, and smaller than the needle through hole of the needle guard, the eccentric hole of the eccentric stopper, the needle hole of the spring clip, and the catheter of the catheter seat assembly Bore;
  • the indwelling needle When the needle holder is pulled back, the indwelling needle is triggered to self-destruct.
  • the needle holder drives the needle tube to move back along the axial direction.
  • the eccentric stopper that loses the support of the needle tube is in the needle guard.
  • the eccentric baffle is in balance with the inner wall of the cavity of the needle guard through more than 2 fulcrums of the outer contour, and the solid surface of the eccentric baffle completely blocks the needle guard
  • the blind hole of the eccentric baffle avoids the needle tip of the needle tube to enter the eccentric hole.
  • the front part of the side wall of the cavity of the needle guard is provided with a number of stop protrusions arranged in the circumferential direction, and the eccentric stopper is inserted from the front port of the needle guard and squeezed by the outer contour The stop protrusion beyond the front part of the side wall of the cavity is inserted into the cavity.
  • the side wall of the front port of the needle shield is provided with guide grooves and/or guide ribs
  • the rear side wall of the catheter base of the catheter base assembly is provided with guide ribs and/or guide ribs matching the guide grooves. Guide grooves with matching guide ribs.
  • the side wall of the needle guard is provided with a front baffle part slot communicating with the front part of the cavity, and the front baffle part of the spring clip is inserted into the needle guard through the front baffle part slot The front part of the cavity.
  • the rear of the needle guard is provided with a rear baffle part catching groove
  • the rear baffle part of the spring clip is installed in the rear baffle part catching groove
  • the back baffle part of the spring clip is provided with
  • the left or right side of the side wall of the needle shield is provided with an opening, and two connecting part fixing blocks connected with the internal structure of the needle shield are arranged in the opening, and the two connecting parts are The fixing blocks are arranged up and down and the opposite faces are provided with tooth surfaces.
  • the connecting part of the spring clip is installed in the opening.
  • the connecting part of the spring clip is provided with two or more second elastic hooks, and more than two elastic hooks are arranged on the connecting part of the spring clip. The second elastic hook is squeezed against the tooth surfaces of the two connecting part fixing blocks, so that the connecting part of the spring clip is clamped in the opening of the needle guard.
  • the upper side of the needle guard sleeve is provided with an elastic cantilever portion clamping groove
  • the groove wall of the elastic cantilever portion clamping groove is provided with a plurality of clamping protrusions
  • the elastic cantilever portion of the spring clip is The rear part is installed in the clamping groove of the elastic cantilever part, and is clamped by the clamping protrusion.
  • the needle seat includes a seat body part and a handle part.
  • the seat body part is provided with an inner hole and a needle fixing hole communicating back and forth along the axis.
  • the seat body part is sleeved on the rear part of the needle guard through the inner hole, so The rear end of the needle tube is fixed in the needle fixing hole, and the handle part is connected to the side of the seat body part.
  • an infusion hose assembly which includes an infusion hose, a hemostatic clip, an infusion and infusion connector, a heparin cap, and an end cap.
  • the present invention has the following beneficial effects: the overall structure is compact, the operation is simple, the needle holder is pulled backwards, so that the needle holder drives the needle tube back in the axial direction, and when the needle tip of the needle tube exits the eccentric hole of the eccentric baffle, That is to realize the self-destruction of the indwelling needle.
  • the eccentric stopper that loses the support of the needle tube moves freely in the cavity of the needle guard until it reaches a balanced state.
  • the eccentric stopper blocks the front end of the needle through hole of the needle guard, and the spring
  • the stop needle hole of the clip is matched with the annular protrusion of the needle tube to limit the position of the needle tube in the axial direction, so that the needle tip of the needle tube is shielded in the needle protection sleeve, and the safety of the product is improved.
  • FIG. 1 is a schematic diagram of the overall structure of Embodiment 1.
  • FIG. 1 is a schematic diagram of the overall structure of Embodiment 1.
  • FIG. 2 is a schematic diagram of an exploded structure of Embodiment 1.
  • FIG. 2 is a schematic diagram of an exploded structure of Embodiment 1.
  • FIG. 3 is a cross-sectional view of Embodiment 1.
  • FIG. 3 is a cross-sectional view of Embodiment 1.
  • FIG. 4 is a schematic diagram of the structure of the needle guard in Embodiment 1.
  • FIG. 4 is a schematic diagram of the structure of the needle guard in Embodiment 1.
  • FIG. 5 is a schematic diagram of a three-dimensional cross-sectional view of the needle guard in Embodiment 1.
  • FIG. 5 is a schematic diagram of a three-dimensional cross-sectional view of the needle guard in Embodiment 1.
  • FIG. 6 is another schematic diagram of the structure of the needle guard in Embodiment 1.
  • FIG. 6 is another schematic diagram of the structure of the needle guard in Embodiment 1.
  • FIG. 7 is a schematic diagram of the front end structure of the needle guard in Embodiment 1.
  • FIG. 7 is a schematic diagram of the front end structure of the needle guard in Embodiment 1.
  • FIG. 8 is a schematic diagram of the structure of the eccentric baffle in embodiment 1.
  • FIG. 8 is a schematic diagram of the structure of the eccentric baffle in embodiment 1.
  • FIG. 9 is a cross-sectional view of the eccentric stopper in Embodiment 1.
  • FIG. 9 is a cross-sectional view of the eccentric stopper in Embodiment 1.
  • FIG. 10 is a schematic diagram of a posture of the single-piece eccentric baffle in the balanced state in Embodiment 1.
  • FIG. 10 is a schematic diagram of a posture of the single-piece eccentric baffle in the balanced state in Embodiment 1.
  • Fig. 11 is a schematic diagram of another posture of the single-piece eccentric baffle in embodiment 1 in a balanced state.
  • FIG. 12 is a schematic diagram of the structure of the spring clip in Embodiment 1.
  • FIG. 12 is a schematic diagram of the structure of the spring clip in Embodiment 1.
  • FIG. 13 is another schematic diagram of the structure of the spring clip in Embodiment 1.
  • FIG. 13 is another schematic diagram of the structure of the spring clip in Embodiment 1.
  • FIG. 14 is a schematic diagram of the assembly process of the needle guard, the eccentric stopper, and the spring clip in Embodiment 1.
  • Fig. 15 is a cross-sectional view of the needle hub in the first embodiment.
  • FIG. 16 is a schematic diagram of the structure of the needle tube in Embodiment 1.
  • FIG. 16 is a schematic diagram of the structure of the needle tube in Embodiment 1.
  • FIG. 17 is a schematic diagram of the assembly process of the needle tube, the needle seat, the assembled needle guard, the eccentric stopper, and the spring clip in Embodiment 1.
  • FIG. 18 is a schematic diagram of the structure of the catheter base assembly in Embodiment 1.
  • FIG. 18 is a schematic diagram of the structure of the catheter base assembly in Embodiment 1.
  • FIG. 19 is a schematic diagram of the structure of the catheter hub in Embodiment 1.
  • FIG. 19 is a schematic diagram of the structure of the catheter hub in Embodiment 1.
  • Figure 20 is a schematic diagram of embodiment 1 holding the handle of the needle holder to push the needle holder and the needle tube to the desired position, so that the indwelling needle is in an unused state.
  • Fig. 21 is a schematic diagram of embodiment 1 from an unused state to a self-destructed state.
  • Figure 22 is a schematic diagram of a posture of three eccentric baffles in a balanced state.
  • Figure 23 is a schematic diagram of another posture of three eccentric baffles in a balanced state.
  • 24 is a schematic diagram of the overall structure of the second embodiment.
  • an indwelling needle with a shielding needle eccentric stopper includes a needle protective sleeve 1, an eccentric stopper 2, a spring clip 3, a needle seat 4, a needle tube 5, and a catheter seat assembly 6.
  • a cavity 101 is provided in the front part of the needle guard 1, and the front part of the side wall of the cavity 101 is provided with a number of stop protrusions 102 arranged in the circumferential direction.
  • the needle guard The lower side of the side wall 1 is provided with a mandrel guide hole 103 communicating with the cavity 101.
  • the front end of the needle guard 1 is provided with a front port communicating with the cavity 101, and the side wall of the front port is provided with an axially extending guide groove 104 and a guide rib 105, the guide groove 104 and the guide rib 105 is arranged symmetrically at 180°, the front end of the guide groove 104 extends to the front end of the needle guard 1, and the guide rib 105 is arranged on the inner wall of the front port.
  • a needle through hole 106 penetrating along the axis is provided in the rear of the needle guard 1, the front end of the needle through hole 106 is in communication with the cavity 101, and the rear end of the needle through hole 106 leads to the rear of the needle guard 1.
  • the left or right side of the side wall of the needle guard 1 is open from the cavity 101 to the rear end, and the needle guard 1 is provided with a spring clip mounting structure, and the spring clip mounting structure includes a front baffle Part notch 107, tailgate part slot 108, two connecting part fixing blocks 109, elastic cantilever part slot 110.
  • the front baffle part notch 107 is provided at the front end of the opening and communicates with the front part of the cavity 101 correspondingly.
  • the rear baffle part catching groove 108 is opened in the rear part of the needle guard 1 along the radial surface and communicates with the opening.
  • the rear baffle part catching groove 108 divides the needle through hole 106 into two sections.
  • the two connecting part fixing blocks 109 are arranged at the front part of the opening and connected with the internal structure of the needle guard 1.
  • the two connecting part fixing blocks 109 are arranged up and down with tooth surfaces 111 on opposite surfaces.
  • the elastic cantilever portion retaining slot 110 is axially opened on the upper side of the needle guard 1 and communicates with the cavity 101, the opening, and the rear fence portion retaining slot 108.
  • the elastic cantilever portion retaining slot 110 is on the groove wall A number of clamping protrusions 112 are provided.
  • the eccentric baffle 2 is installed in the cavity 101 of the needle guard 1 and arranged along the radial plane.
  • the number of the eccentric baffle 2 is more than one, and the eccentric baffle 2 is provided
  • There is a through eccentric hole 201 the eccentric hole 201 is provided with rounded corners along the edge, the rear end surface of the eccentric baffle 2 is provided with a plurality of blind holes 202 evenly distributed on the peripheral side of the eccentric hole 201 in the circumferential direction, the eccentric baffle 5
  • the outer contour is provided with more than 2 fulcrums.
  • the outer contour shape, the number of fulcrums, and the distribution positions of the fulcrums of the eccentric baffle 2 are variable.
  • the outer contour of the eccentric baffle 2 is provided with 6 fulcrums, which are respectively 2 fulcrums a203, 2 fulcrums b204, and 2 fulcrums c205.
  • the eccentric baffle 2 is in the cavity 101 of the needle guard 1. There are 2 postures in the balanced state, see Figure 10 and Figure 11.
  • the spring clip 3 is installed in the needle guard 1.
  • the spring clip 3 includes a front baffle part 301, a rear baffle part 302, a connecting part 303, and an elastic cantilever part 304.
  • the front baffle portion 301 is installed at the front of the cavity 101 through the front baffle portion notch 107 of the needle guard 1, and the internal structure of the front baffle portion 301 and the needle guard 1 aligns with the eccentric baffle 2 in the axial direction.
  • the front and back limit, the front baffle portion 301 is provided with a needle hole 305 coaxial with the needle through hole 106 of the needle guard 1.
  • the rear baffle portion 302 is installed in the rear baffle portion clamping groove 108 through the opening of the needle guard 1, and the rear baffle portion 302 is provided with a stop pin hole that is coaxial with the needle through hole 106 of the needle guard 1 306.
  • the tailgate portion 302 is provided with a number of first elastic hooks 307 that cooperate with the tailgate portion groove 108, and the first elastic hooks 307 are squeezed into the tailgate portion groove 108 A force is provided to make the tailgate portion 302 clamp in the tailgate portion catching groove 108.
  • the two ends of the connecting part 303 are respectively connected with the front baffle part 301 and the rear baffle part 302, the connecting part 303 is arranged along the opening of the needle guard 1, and the connecting part 303 is provided with two connecting parts with the needle guard 1.
  • the connecting portion 303 is positioned at the opening of the needle guard 1.
  • the rear end of the elastic cantilever portion 304 is connected to the rear baffle portion 302, the elastic cantilever portion 304 is installed in the needle protection sleeve 1 through the opening of the needle protection sleeve 1, and the rear part of the elastic cantilever portion 304 is installed in the needle protection sleeve 1.
  • the elastic cantilever portion 304 is in the clamping groove 110 and is clamped by the clamping protrusion 112.
  • the front end of the elastic cantilever portion 304 extends to the front port of the needle guard 1, and the front end of the elastic cantilever portion 304 is provided with a buckle 309.
  • the elastic cantilever portion 304 is pushed upward by the eccentric baffle 2 through the front to generate elastic deformation.
  • the assembly process of the needle guard 1, the eccentric stopper 2, and the spring clip 3 is as follows: first install the eccentric stopper 2 into the cavity 101 of the needle guard 1, specifically, remove the eccentric stopper 2 from The front port of the needle guard 1 is installed, so that the outer contour of the eccentric baffle 2 squeezes over the stop protrusion 102 at the front of the side wall of the cavity 101, and then is inserted into the cavity 101.
  • the spring clip 3 installed in the needle guard 1, specifically, install the front baffle portion 301 of the spring clip 3 from the front baffle portion notch 107 of the needle guard 1 to the front of the cavity 101, Insert the rear fence portion 302 of the spring clip 3 into the rear fence portion retaining slot 108 from the opening of the needle guard 1, and the rear fence portion 302 is clamped in the rear fence portion retaining slot by the first elastic hook 307 In 108, the connecting part 303 of the spring clip 3 is set in the opening of the needle guard 1, so that the second elastic hooks 308 arranged in two rows are pressed against the two connecting parts of the needle guard 1.
  • the elastic cantilever portion 304 of the spring clip 3 is inserted into the needle guard 1 from the opening of the needle guard 1, and the rear part of the elastic cantilever portion 304 is installed in the elastic cantilever portion slot 110
  • the front part of the elastic cantilever portion 304 is arranged on the upper side of the eccentric baffle 2 and is clamped by the clamping protrusion 112.
  • the needle holder 4 includes a seat body portion 401 and a handle portion 402.
  • the seat body portion 401 is provided with an inner hole 403 and a needle fixing hole 404 communicating back and forth along the axis, and the seat body portion 401 passes through the inner hole 403.
  • the rear part of the needle guard 1 is sheathed, the needle fixing hole 404 is used to fix the rear end of the needle tube 5, and the handle part 402 is connected to the side of the seat body part 401.
  • the front end of the needle tube 5 is a needle tip, and the needle tube 5 is provided with a slot 501 and an annular protrusion 502 arranged back and forth in the axial direction near the needle tip.
  • the slot 501 is opened along the axial direction of the needle tube 5, so
  • the annular protrusion 502 is arranged on the outer wall of the needle tube 5 protrudingly in the circumferential direction.
  • the outer diameter of the annular protrusion 502 is larger than the stop pin hole 306 of the spring clip 3 and smaller than the needle through hole 106 and the eccentric stopper of the needle guard 1
  • the eccentric hole 201 of 2 the needle hole 305 of the spring clip 3, and the inner hole of the catheter 603 of the catheter adapter assembly 6.
  • the assembly process of the needle tube 5, the needle seat 4 and the assembled needle guard 1, the eccentric stopper 2, and the spring clip 3 are as follows: First, guide the auxiliary tool ejector rod 8 from the ejector rod of the needle protection sleeve 1.
  • the hole 103 extends in, and the push rod 8 is operated to push up the eccentric baffle 2 in the cavity 101 so that the eccentric hole 201 of the eccentric baffle 2 is aligned with the needle through hole 106 of the needle guard 1.
  • the front section of the needle through hole 106 of the needle guard 1, the stop needle hole 306 of the spring clip 3, and the rear section of the needle through hole 106 of the needle guard 1 protrude from the rear end of the needle guard 1.
  • the auxiliary tool ejector rod 8 is removed, and the needle tube 5 supports the eccentric stopper 2 to push up against the front part of the elastic cantilever portion 304 of the spring clip 3 to keep the elastic cantilever portion 304 elastically deformed.
  • the catheter socket assembly 6 includes a catheter socket 601, a metal wedge 602, a pipe 603, and an isolation plug 604.
  • the metal wedge 602 and the isolation plug 604 are installed in the catheter socket 601.
  • the front end of the catheter holder 601 extends, and the rear end of the catheter 603 is fixed on the metal wedge 602.
  • the rear part of the catheter base 601 is installed in the front end of the needle guard 1, and the rear side wall of the catheter base 601 is provided with a guide rib 6011, a guide groove 6012, and a bayonet 6013.
  • the guide ribs 6011 and the guide grooves 6012 extend in the axial direction and are arranged symmetrically at 180°.
  • the guide ribs 6011 are arranged on the rear outer wall of the catheter base 601, and the guide ribs 6011 and the guide groove 104 of the front port of the needle guard 1 guide Cooperate, the rear end of the guide groove 6012 extends to the rear surface of the catheter base 601, the guide groove 6012 is guided and matched with the guide rib 105 of the front port of the needle guard 1, and the bayonet 6013 is provided on the rear side of the guide rib 6011, The bayonet 6013 is snap-fitted with the buckle 309 of the elastic cantilever portion 304 of the spring clip 3, so that the circumferential and axial locking of the catheter socket 601 is realized, and the entire catheter socket assembly 6 is installed at the front end of the needle guard 1.
  • the process of operating the needle hub 4 to make the indwelling needle in an unused state is as follows: hold the handle 402 of the needle hub 4 to drive the needle hub 4 and the needle tube 5 forward Move to make the needle holder 4 tightly sleeve the tail of the needle guard 1 so that the needle tip of the needle tube 5 is exposed from the front end of the catheter 603 of the catheter holder assembly 6, and the exposed length of the needle tip meets the standard requirements.
  • the lower part of Fig. 20 is an indwelling needle in an unused state.
  • the eccentric hole 201 of the eccentric baffle 2 and the needle through hole 106 of the needle guard 1 are different in axis, and the eccentric stop The solid surface of the sheet 2 completely blocks the front end of the front section of the needle through hole 106 of the needle guard 1, and the blind hole 202 of the eccentric blocking sheet 2 evades the needle tip of the needle tube 5 and is guided into the eccentric hole 201 through a rounded corner.
  • the elastic cantilever portion 304 of the spring clip 3 recovers from deformation, and the buckle 309 at the front end of the elastic cantilever portion 304 is released from the bayonet 6013 of the catheter socket 601, and the catheter socket assembly 6 can be removed from the needle guard 1 The front end of the tube is removed. At this point, the indwelling needle completes the self-destruction and separation of the catheter base assembly 6.
  • the number of the eccentric baffle 2 in this embodiment is one, and the number of the eccentric baffle 2 can be more or less, as long as it can block the front end of the needle through hole 106 of the needle guard 1 and the shielding needle tube 5 The function of the needle tip is sufficient.
  • a schematic diagram of three eccentric baffles 2 is given here.
  • the three eccentric baffles 2 have two postures in a balanced state in the cavity 101 of the needle guard 1, see FIGS. 22 and 23. In a posture of the three eccentric baffles 2 shown in FIG.
  • the center distance between the eccentric hole 201 of the eccentric baffle 2 and the needle through hole 106 of the needle guard 1 is L1
  • the three eccentric baffle 2 shown in Figure 23 is in another posture in a balanced state, the eccentric hole 201 of the eccentric baffle 2 and the needle through hole of the needle guard 1
  • the center distance of 106 is L2
  • the diameter of the eccentric hole 201 of the eccentric baffle 2 is d
  • the diameter of the needle through hole 106 of the needle guard 1 is D
  • L1 (R1) and L2(R2) may be the same or different.
  • the eccentric hole 201 of the eccentric baffle 2 will always maintain a state of non-intersecting and non-overlapping with the needle through hole 106 of the needle guard 1 in a balanced state, and the edge of the eccentric hole 201 can shield the needle hole of the needle tube 5 .
  • an indwelling needle with a shielding needle eccentric baffle The difference from Embodiment 1 is that the indwelling needle further includes an infusion hose assembly 7, which includes an infusion hose
  • the hemostatic clip, the infusion connector, the heparin cap, the end cap, and the infusion hose assembly 7 belong to the prior art, so the specific structure of each component and the connection relationship between the components will not be repeated.

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Abstract

一种带有屏蔽针偏心挡片（2）的留置针，包括：针防护套（1），其前部内设有空腔（101），前端面设有前端口，后部内设有针通孔（106）；偏心挡片（2），安装于针防护套（1）的空腔（101）内，其设有偏心孔（201）和多个盲孔（202）；弹簧夹片（3），包括前挡板部（301）、后挡板部（302）、连接部（303）、弹性悬臂部（304），弹性悬臂部（304）驱动偏心挡片（2）移动；针座（4）；针管（5），其穿过弹簧夹片（3）、偏心挡片（2）、针防护套（1），后端固定于针座（4）上，靠近针尖处设有环形凸起（502）；导管座组件（6）。向后拉动针座（4），使针座（4）带动针管（5）后退，当针管（5）的针尖后退出偏心挡片（2）的偏心孔（201）时，实现自毁，此时弹簧夹片（3）的弹性悬臂部（304）驱动偏心挡片（2）挡住针防护套（1）的针通孔（106），针管（5）的环形凸起（502）配合弹簧夹片（3）的后挡板部（302）上的止位针孔（306）对针管（5）轴向后限位，针尖被屏蔽在针防护套（1）内，提高了产品的安全性。

Description

一种带有屏蔽针偏心挡片的留置针 技术领域
本发明属于留置针技术领域，具体涉及一种带有屏蔽针偏心挡片的留置针。
背景技术
现有的部分留置针的缺点在于静脉穿刺后，把针管拔出来，使用后的针管的针尖会暴露在外，因此在进行清理、销毁留置针针管时，很容易刺伤医护人员或其他人，造成交叉感染。还有部分留置针上设计有针管回缩机构，但这种针管回缩机构的结构不够可靠，针管的针尖有再次伸出的可能性，存在安全隐患。
发明内容
本发明针对上述问题，提供一种带有屏蔽针偏心挡片的留置针。
本发明的目的可以通过下述技术方案来实现：
一种带有屏蔽针偏心挡片的留置针，包括：
针防护套，其前部内设有空腔，其侧壁的下侧开设有与空腔连通的顶杆导孔，其前端面开设有与空腔连通的前端口，其后部内设有沿轴线贯通的针通孔；
偏心挡片，安装于针防护套的空腔内且沿径向面设置，其数量为1片以上，其开设有偏心孔，其后端面开设有沿周向布置于偏心孔周侧的多个盲孔，其外轮廓设有2个以上的支点；
弹簧夹片，包括前挡板部、后挡板部、连接部、弹性悬臂部，所述前挡板部安装于针防护套的空腔前部，并对偏心挡片轴向前限位，前挡板部开设有与针防护套的针通孔同轴的针孔，所述后挡板部安装于针防护套的后部内，并将针防护套的针通孔隔成两段，后挡板部开设有与针防护套的针通孔同轴的止位针孔，所述连接部连接前挡板部和后挡板部，所述弹性悬臂部安装于针防护套内，弹性悬臂部的后端与后挡板部连接，弹性悬臂部的前端设有卡扣且延伸至针防护套的前端口，弹性悬臂部被偏心挡片向上顶住产生弹性变形；
针座，连接于针防护套的后侧；
针管，其后端从针防护套的前端口伸入，沿轴向向后依次穿过弹簧夹片的针 孔、偏心挡片的偏心孔、针防护套的针通孔前段、弹簧夹片的止位针孔、针防护套的针通孔后段后，固定于针座上，其前端为针尖且穿过导管座组件后外露，其靠近针尖处设有前后布置的槽孔和环形凸起；以及
导管座组件，包括导管座、金属楔、导管、隔离塞，所述导管座的后部安装于针防护套的前端内，导管座的后部侧壁开设有与弹簧夹片的卡扣相配合的卡口；
其中，所述针管的环形凸起的外径大于弹簧夹片的止位针孔，小于针防护套的针通孔、偏心挡片的偏心孔、弹簧夹片的针孔、导管座组件的导管内孔；
当针座被向后拉动时触发留置针进行自毁，针座带动针管一起沿轴向后退，当针管的针尖后退出偏心挡片的偏心孔时，失去针管支撑的偏心挡片在针防护套的空腔内做自由运动直至达到平衡状态，此时的偏心挡片通过外轮廓的2个以上的支点与针防护套的空腔内壁接触保持平衡，偏心挡片的实心面完全挡住针防护套的针通孔前段的前端，偏心挡片的盲孔规避针管的针尖进入偏心孔内，当针管的针尖继续后退时，针管的环形凸起被弹簧夹片的止位针孔挡住，如此实现针管的针尖被屏蔽在针防护套内；弹簧夹片的弹性悬臂部恢复变形，弹性悬臂部前端的卡扣与导管座组件的导管座的卡口脱扣，导管座组件从针防护套的前端可取下。
进一步地，所述针防护套的空腔的侧壁前部设有沿周向布置的若干止位凸起，所述偏心挡片从针防护套的前端口装入后，通过外轮廓挤压越过空腔侧壁前部的止位凸起装入空腔。
进一步地，所述针防护套的前端口侧壁设有引导槽和/或引导筋，所述导管座组件的导管座的后部侧壁设有与引导槽相配合的导向筋和/或与引导筋相配合的导向槽。
进一步地，所述针防护套的侧壁开设有与空腔的前部连通的前挡板部槽口，所述弹簧夹片的前挡板部通过前挡板部槽口装入针防护套的空腔前部。
进一步地，所述针防护套的后部内开设有后挡板部卡槽，所述弹簧夹片的后挡板部安装于后挡板部卡槽内，弹簧夹片的后挡板部上设有若干第一弹性卡钩，所述第一弹性卡钩在后挡板部卡槽内被挤压来提供作用力，使弹簧夹片的后挡板部卡紧在后挡板部卡槽内。
进一步地，所述针防护套侧壁的左侧或右侧开设有敞口，所述敞口内设有与针防护套的内部结构连接的两个连接部固定块，两个所述连接部固定块呈上下布置且相向面设有齿面，所述弹簧夹片的连接部安装于敞口内，弹簧夹片的连接部上设有两个以上的第二弹性卡钩，两个以上的所述第二弹性卡钩被挤压抵靠在两个连接部固定块的齿面上，使弹簧夹片的连接部卡紧在针防护套的敞口内。
进一步地，所述针防护套内的上侧开设有弹性悬臂部卡槽，所述弹性悬臂部卡槽的的槽壁上设有若干夹紧凸起，所述弹簧夹片的弹性悬臂部的后部安装于弹性悬臂部卡槽内，并被夹紧凸起卡紧。
进一步地，所述针座包括座体部和手柄部，所述座体部内开设有沿轴线前后连通的内孔和针固定孔，座体部通过内孔套装于针防护套的后部，所述针固定孔内固定针管的后端，所述手柄部连接于座体部的旁侧。
进一步地，还包括输液软管组件，所述输液软管组件包括输液软管、止血夹、注输液接头、肝素帽、端帽。
与现有技术相比，本发明的有益效果：整体结构紧凑，操作简单，向后拉动针座，使针座带动针管沿轴向后退，当针管的针尖后退出偏心挡片的偏心孔时，即实现留置针的自毁，失去针管支撑的偏心挡片在针防护套的空腔内做自由运动直至达到平衡状态，此时的偏心挡片挡住针防护套的针通孔前段的前端，弹簧夹片的止位针孔与针管的环形凸起配合在轴向对针管后限位，实现将针管的针尖屏蔽在针防护套内，提高了产品的安全性。
附图说明
图1为实施例1的整体结构示意图。
图2为实施例1的分解结构示意图。
图3为实施例1的剖视图。
图4为实施例1中的针防护套的一结构示意图。
图5为实施例1中的针防护套的立体剖面示意图。
图6为实施例1中的针防护套的另一结构示意图。
图7为实施例1中的针防护套的前端结构示意图。
图8为实施例1中的偏心挡片的结构示意图。
图9为实施例1中的偏心挡片的剖视图。
图10为实施例1中的单片偏心挡片在平衡状态下的一姿态示意图。
图11为实施例1中的单片偏心挡片在平衡状态下的另一姿态示意图。
图12为实施例1中的弹簧夹片的一结构示意图。
图13为实施例1中的弹簧夹片的另一结构示意图。
图14为实施例1中的针防护套、偏心挡片、弹簧夹片的装配过程示意图。
图15为实施例1中的针座的剖视图。
图16为实施例1中的针管的结构示意图。
图17为实施例1中的针管、针座与已装配好的针防护套、偏心挡片、弹簧夹片的装配过程示意图。
图18为实施例1中的导管座组件的结构示意图。
图19为实施例1中的导管座的结构示意图。
图20为实施例1手持针座的手柄补将针座和针管推至所需位置，使留置针处于未使用状态的示意图。
图21为实施例1从未使用状态到自毁状态的示意图。
图22为3片偏心挡片在平衡状态下的一姿态示意图。
图23为3片偏心挡片在平衡状态下的另一姿态示意图。
图24为实施例2的整体结构示意图。
图中部件标号如下：
1 针防护套
101 空腔
102 止位凸起
103 顶杆导孔
104 引导槽
105 引导筋
106 针通孔
107 前挡板部槽口
108 后挡板部卡槽
109 连接部固定块
110 弹性悬臂部卡槽
111 齿面
112 夹紧凸起
2 偏心挡片
201 偏心孔
202 盲孔
203 支点a
204 支点b
205 支点c
3 弹簧夹片
301 前挡板部
302 后挡板部
303 连接部
304 弹性悬臂部
305 针孔
306 止位针孔
307 第一弹性卡钩
308 第二弹性卡钩
309 卡扣
4 针座
401 座体部
402 手柄部
403 内孔
404 针固定孔
5 针管
501 槽孔
502 环形凸起
6 导管座组件
601 导管座
6011 导向筋
6012 导向槽
6013 卡口
602 金属楔
603 导管
604 隔离塞
7 输液软管组件
8 顶杆。
具体实施方式
以下结合附图详细说明本发明的具体实施方式，使本领域的技术人员更清楚地理解如何实践本发明。尽管结合其优选的具体实施方案描述了本发明，但这些实施方案只是阐述，而不是限制本发明的范围。
实施例1
参见图1至图3，一种带有屏蔽针偏心挡片的留置针，包括针防护套1、偏心挡片2、弹簧夹片3、针座4、针管5、导管座组件6。
参见图4至图7，所述针防护套1的前部内设有空腔101，所述空腔101的侧壁前部设有沿周向布置的若干止位凸起102，针防护套1侧壁的下侧开设有与空腔101连通的顶杆导孔103。
所述针防护套1的前端面开设有与空腔101连通的前端口，所述前端口侧壁设有轴向延伸的一引导槽104和一引导筋105，所述引导槽104和引导筋105呈180°对称布置，引导槽104的前端延伸至针防护套1的前端面，引导筋105设置于前端口内壁。
所述针防护套1的后部内设有沿轴线贯通的针通孔106，所述针通孔106的前端与空腔101连通，针通孔106的后端通至针防护套1的后端面中心。
所述针防护套1侧壁的左侧或右侧自空腔101到后端面设为敞口，针防护套1上设有弹簧夹片安装结构，所述弹簧夹片安装结构包括前挡板部槽口107、后挡板部卡槽108、两个连接部固定块109、弹性悬臂部卡槽110。
所述前挡板部槽口107设置于敞口的前端处，并与空腔101的前部对应连通。所述后挡板部卡槽108沿径向面开设于针防护套1的后部内，并与敞口连通，后挡板部卡槽108将针通孔106隔成两段。两个所述连接部固定块109设置于敞口 的前部，并与针防护套1的内部结构连接，两个连接部固定块109呈上下布置且相向面设有齿面111。所述弹性悬臂部卡槽110沿轴向开设于针防护套1内的上侧，并与空腔101、敞口、后挡板部卡槽108连通，弹性悬臂部卡槽110的槽壁上设有若干夹紧凸起112。
参见图3、图8和图9，所述偏心挡片2安装于针防护套1的空腔101内且沿径向面设置，偏心挡片2的数量为1片以上，偏心挡片2开设有贯通的偏心孔201，所述偏心孔201沿边缘设有倒圆角，偏心挡片2的后端面开设有沿周向均布于偏心孔201周侧的多个盲孔202，偏心挡片5的外轮廓设有2个以上的支点。
其中，所述偏心挡片2的外轮廓形状、支点的数量、支点的分布位置可变。本实施例中，偏心挡片2的外轮廓设有6个支点，分别为2个支点a203、2个支点b204、2个支点c205，该偏心挡片2在针防护套1的空腔101内的平衡状态下具有2种姿态，参见图10和图11。
参见图3、图12和图13，所述弹簧夹片3安装于针防护套1内，弹簧夹片3包括前挡板部301、后挡板部302、连接部303、弹性悬臂部304。
所述前挡板部301通过针防护套1的前挡板部槽口107安装于空腔101的前部，前挡板部301和针防护套1的内部结构在轴向对偏心挡片2前后限位，前挡板部301开设有与针防护套1的针通孔106同轴的针孔305。
所述后挡板部302通过针防护套1的敞口安装于后挡板部卡槽108内，后挡板部302开设有与针防护套1的针通孔106同轴的止位针孔306，后挡板部302上设有与后挡板部卡槽108相配合的若干第一弹性卡钩307，所述第一弹性卡钩307在后挡板部卡槽108内被挤压来提供作用力，使后挡板部302卡紧在后挡板部卡槽108内。
所述连接部303的两端分别与前挡板部301和后挡板部302连接，连接部303沿针防护套1的敞口设置，连接部303上设有与针防护套1的两个连接部固定块109相配合的两个以上的第二弹性卡钩308，两个以上的所述第二弹性卡钩308被挤压抵靠在两个连接部固定块109的齿面111上，使连接部303被定位在针防护套1的敞口。
所述弹性悬臂部304的后端与后挡板部302连接，弹性悬臂部304通过针防护套1的敞口安装于针防护套1内，弹性悬臂部304的后部安装于针防护套1 的弹性悬臂部卡槽110内，并被夹紧凸起112卡紧，弹性悬臂部304的前端延伸至针防护套1的前端口，弹性悬臂部304的前端设有卡扣309，弹性悬臂部304通过前部被偏心挡片2向上顶住产生弹性变形。
参见图14，针防护套1、偏心挡片2、弹簧夹片3的装配过程如下：先将偏心挡片2安装到针防护套1的空腔101内，具体为，将偏心挡片2从针防护套1的前端口装入，使偏心挡片2的外轮廓挤压越过空腔101侧壁前部的止位凸起102，进而装入空腔101。再将弹簧夹片3安装在针防护套1内，具体为，将弹簧夹片3的前挡板部301从针防护套1的前挡板部槽口107安装于空腔101的前部，将弹簧夹片3的后挡板部302从针防护套1的敞口装入后挡板部卡槽108，后挡板部302通过第一弹性卡钩307卡紧在后挡板部卡槽108内，将弹簧夹片3的连接部303设置于针防护套1的敞口，使布置成上下两排的第二弹性卡钩308被挤压抵靠在针防护套1的两个连接部固定块109的齿面111上，将弹簧夹片3的弹性悬臂部304从针防护套1的敞口装入针防护套1内，弹性悬臂部304的后部安装于弹性悬臂部卡槽110内，并被夹紧凸起112卡紧，弹性悬臂部304的前部设置于偏心挡片2的上侧。
参见图15，所述针座4包括座体部401和手柄部402，所述座体部401内开设有沿轴线前后连通的内孔403和针固定孔404，座体部401通过内孔403套住针防护套1的后部，所述针固定孔404用于固定针管5的后端，所述手柄部402连接于座体部401的旁侧。
参见图16，所述针管5的前端为针尖，针管5的靠近针尖处设有沿轴向前后布置的槽孔501和环形凸起502，所述槽孔501沿针管5的轴向开设，所述环形凸起502沿周向凸起地设置于针管5外壁，环形凸起502的外径大于弹簧夹片3的止位针孔306，小于针防护套1的针通孔106、偏心挡片2的偏心孔201、弹簧夹片3的针孔305、导管座组件6的导管603内孔。
参见图17，针管5、针座4与已装配好的针防护套1、偏心挡片2、弹簧夹片3的装配过程如下：先将辅助工具顶杆8从针防护套1的顶杆导孔103伸入，操作顶杆8上顶将空腔101内的偏心挡片2顶起，使偏心挡片2的偏心孔201对准针防护套1的针通孔106。再将针管5的后端从针防护套1的前端口伸入，使针管5的后端沿轴向向后依次穿过弹簧夹片3的针孔305、偏心挡片2的偏心 孔201、针防护套1的针通孔106前段、弹簧夹片3的止位针孔306、针防护套1的针通孔106后段后，从针防护套1的后端伸出。接着，将针管5的后端经过针座4的内孔403插入针固定孔404内，通过环保快干胶水固定。此时，取下辅助工具顶杆8，针管5支撑偏心挡片2向上顶住弹簧夹片3的弹性悬臂部304的前部，使弹性悬臂部304保持弹性变形。
参见图18，所述导管座组件6包括导管座601、金属楔602、导管603、隔离塞604，所述金属楔602、隔离塞604安装于导管座601内，所述导管603的前部从导管座601的前端伸出，导管603的后端固定于金属楔602上。
其中，参见图3和图19，所述导管座601的后部安装于针防护套1的前端内，导管座601的后部侧壁设有导向筋6011、导向槽6012、卡口6013，所述导向筋6011和导向槽6012均沿轴向延伸且呈180°对称布置，所述导向筋6011设置于导管座601的后部外壁，导向筋6011与针防护套1前端口的引导槽104导向配合，所述导向槽6012的后端延伸至导管座601的后端面，导向槽6012与针防护套1前端口的引导筋105导向配合，所述卡口6013设置于导向筋6011的后侧，卡口6013与弹簧夹片3的弹性悬臂部304的卡扣309卡扣配合，如此，实现导管座601的周向和轴向锁定，整个导管座组件6安装于针防护套1的前端。
参见图20，在导管座组件6与针防护套1装配好后，操作针座4使留置针处于未使用状态的过程如下：手持针座4的手柄部402带动针座4和针管5向前移动，使针座4紧套住针防护套1的尾部，使针管5的针尖从导管座组件6的导管603前端露出，并且针尖露出长度符合标准要求。图20的下侧部分为处于未使用状态的留置针。
参见图21，留置针使用完后，向后拉动针座4触发留置针进行自毁和拆下导管座组件6的过程如下：手持针座4的手柄部402带动针座4和针管5向后移动，当针管5的针尖后退出偏心挡片2的偏心孔201时，失去针管5支撑的偏心挡片2在针防护套1的空腔101内做自由运动直至达到平衡状态，此时的偏心挡片2通过外轮廓的2个以上的支点与针防护套1的空腔101内壁接触保持平衡，偏心挡片2的偏心孔201与针防护套1的针通孔106不同轴，偏心挡片2的实心面完全挡住针防护套1的针通孔106前段的前端，偏心挡片2的盲孔202规避针管5的针尖通过倒圆角导入偏心孔201内。当针管5的针尖继续后退至弹簧夹片 3的后挡板部302时，针管5的环形凸起502被后挡板部302上的止位针孔306挡住，使得针管5的针尖被屏蔽在针防护套1内，此时产品已进入自毁状态，无法再使用。参见图21的最下部分，弹簧夹片3的弹性悬臂部304恢复变形，弹性悬臂部304前端的卡扣309与导管座601的卡口6013脱扣，导管座组件6可以从针防护套1的前端取下，至此，留置针完成自毁和导管座组件6的分离。
本实施例中的偏心挡片2的数量为1片，偏心挡片2的数量可以有更多或更少，只要能实现挡住针防护套1的针通孔106前段的前端和屏蔽针管5的针尖的功能即可。这边另外给出3片偏心挡片2的示意图，3片偏心挡片2在针防护套1的空腔101内的平衡状态下具有2种姿态，参见图22和图23。图22所示的3片偏心挡片2在平衡状态下的一姿态中，偏心挡片2的偏心孔201和针防护套1的针通孔106的中心距为L1，偏心孔201的运动轨迹为半径为R1(R1＝L1)的圆；图23所示的3片偏心挡片2在平衡状态下的另一姿态中，偏心挡片2的偏心孔201和针防护套1的针通孔106的中心距为L2，偏心孔201的运动轨迹为半径为R2(R2＝L2)的圆。其中，偏心挡片2的偏心孔201的直径为d，针防护套1的针通孔106的直径为D，L1＞(D+d)/2，L2＞(D+d)/2，L1(R1)与L2(R2)可以相同或者不同。这样一来，偏心挡片2的偏心孔201在平衡状态下会始终保持与针防护套1的针通孔106不相交、不重叠的状态，并且偏心孔201的边缘能够遮蔽针管5的针孔。
实施例2
参见图24，一种带有屏蔽针偏心挡片的留置针，与实施例1的区别之处在于，所述留置针还包括输液软管组件7，所述输液软管组件7包括输液软管、止血夹、注输液接头、肝素帽、端帽，输液软管组件7属于现有技术，故不赘述各个部件的具体结构和部件间的连接关系。
应当指出，对于经充分说明的本发明来说，还可具有多种变换及改型的实施方案，并不局限于上述实施方式的具体实施例。上述实施例仅仅作为本发明的说明，而不是对本发明的限制。总之，本发明的保护范围应包括那些对于本领域普通技术人员来说显而易见的变换或替代以及改型。

Claims (9)

  1. 一种带有屏蔽针偏心挡片的留置针，其特征在于，包括：
    针防护套，其前部内设有空腔，其侧壁的下侧开设有与空腔连通的顶杆导孔，其前端面开设有与空腔连通的前端口，其后部内设有沿轴线贯通的针通孔；
    偏心挡片，安装于针防护套的空腔内且沿径向面设置，其数量为1片以上，其开设有偏心孔，其后端面开设有沿周向布置于偏心孔周侧的多个盲孔，其外轮廓设有2个以上的支点；
    弹簧夹片，包括前挡板部、后挡板部、连接部、弹性悬臂部，所述前挡板部安装于针防护套的空腔前部，并对偏心挡片轴向前限位，前挡板部开设有与针防护套的针通孔同轴的针孔，所述后挡板部安装于针防护套的后部内，并将针防护套的针通孔隔成两段，后挡板部开设有与针防护套的针通孔同轴的止位针孔，所述连接部连接前挡板部和后挡板部，所述弹性悬臂部安装于针防护套内，弹性悬臂部的后端与后挡板部连接，弹性悬臂部的前端设有卡扣且延伸至针防护套的前端口，弹性悬臂部被偏心挡片向上顶住产生弹性变形；
    针座，连接于针防护套的后侧；
    针管，其后端从针防护套的前端口伸入，沿轴向向后依次穿过弹簧夹片的针孔、偏心挡片的偏心孔、针防护套的针通孔前段、弹簧夹片的止位针孔、针防护套的针通孔后段后，固定于针座上，其前端为针尖且穿过导管座组件后外露，其靠近针尖处设有前后布置的槽孔和环形凸起；以及
    导管座组件，包括导管座、金属楔、导管、隔离塞，所述导管座的后部安装于针防护套的前端内，导管座的后部侧壁开设有与弹簧夹片的卡扣相配合的卡口；
    其中，所述针管的环形凸起的外径大于弹簧夹片的止位针孔，小于针防护套的针通孔、偏心挡片的偏心孔、弹簧夹片的针孔、导管座组件的导管内孔；
    当针座被向后拉动时触发留置针进行自毁，针座带动针管一起沿轴向后退，当针管的针尖后退出偏心挡片的偏心孔时，失去针管支撑的偏心挡片在针防护套的空腔内做自由运动直至达到平衡状态，此时的偏心挡片通过外轮廓的2个以上的支点与针防护套的空腔内壁接触保持平衡，偏心挡片的实心面完全挡住针防护套的针通孔前段的前端，偏心挡片的盲孔规避针管的针尖进入 偏心孔内，当针管的针尖继续后退时，针管的环形凸起被弹簧夹片的止位针孔挡住，如此实现针管的针尖被屏蔽在针防护套内；弹簧夹片的弹性悬臂部恢复变形，弹性悬臂部前端的卡扣与导管座组件的导管座的卡口脱扣，导管座组件从针防护套的前端可取下。
  2. 根据权利要求1所述的带有屏蔽针偏心挡片的留置针，其特征在于，所述针防护套的空腔的侧壁前部设有沿周向布置的若干止位凸起，所述偏心挡片从针防护套的前端口装入后，通过外轮廓挤压越过空腔侧壁前部的止位凸起装入空腔。
  3. 根据权利要求1所述的带有屏蔽针偏心挡片的留置针，其特征在于，所述针防护套的前端口侧壁设有引导槽和/或引导筋，所述导管座组件的导管座的后部侧壁设有与引导槽相配合的导向筋和/或与引导筋相配合的导向槽。
  4. 根据权利要求1所述的带有屏蔽针偏心挡片的留置针，其特征在于，所述针防护套的侧壁开设有与空腔的前部连通的前挡板部槽口，所述弹簧夹片的前挡板部通过前挡板部槽口装入针防护套的空腔前部。
  5. 根据权利要求1所述的带有屏蔽针偏心挡片的留置针，其特征在于，所述针防护套的后部内开设有后挡板部卡槽，所述弹簧夹片的后挡板部安装于后挡板部卡槽内，弹簧夹片的后挡板部上设有若干第一弹性卡钩，所述第一弹性卡钩在后挡板部卡槽内被挤压来提供作用力，使弹簧夹片的后挡板部卡紧在后挡板部卡槽内。
  6. 根据权利要求1所述的带有屏蔽针偏心挡片的留置针，其特征在于，所述针防护套侧壁的左侧或右侧开设有敞口，所述敞口内设有与针防护套的内部结构连接的两个连接部固定块，两个所述连接部固定块呈上下布置且相向面设有齿面，所述弹簧夹片的连接部安装于敞口内，弹簧夹片的连接部上设有两个以上的第二弹性卡钩，两个以上的所述第二弹性卡钩被挤压抵靠在两个连接部固定块的齿面上，使弹簧夹片的连接部卡紧在针防护套的敞口内。
  7. 根据权利要求1所述的带有屏蔽针偏心挡片的留置针，其特征在于，所述针防护套内的上侧开设有弹性悬臂部卡槽，所述弹性悬臂部卡槽的的槽壁上设有若干夹紧凸起，所述弹簧夹片的弹性悬臂部的后部安装于弹性悬臂部卡槽内，并被夹紧凸起卡紧。
  8. 根据权利要求1所述的带有屏蔽针偏心挡片的留置针，其特征在于，所述针座包括座体部和手柄部，所述座体部内开设有沿轴线前后连通的内孔和针固定孔，座体部通过内孔套住针防护套的后端，所述针固定孔内固定针管的后端，所述手柄部连接于座体部的旁侧。
  9. 根据权利要求1～8任一项所述的带有屏蔽针偏心挡片的留置针，其特征在于，还包括输液软管组件，所述输液软管组件包括输液软管、止血夹、注输液接头、肝素帽、端帽。
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