WO2020164382A1 - 一种安全胰岛素针 - Google Patents

一种安全胰岛素针 Download PDF

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Publication number
WO2020164382A1
WO2020164382A1 PCT/CN2020/073525 CN2020073525W WO2020164382A1 WO 2020164382 A1 WO2020164382 A1 WO 2020164382A1 CN 2020073525 W CN2020073525 W CN 2020073525W WO 2020164382 A1 WO2020164382 A1 WO 2020164382A1
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WO
WIPO (PCT)
Prior art keywords
sheath
needle
safety
limit
positioning
Prior art date
Application number
PCT/CN2020/073525
Other languages
English (en)
French (fr)
Inventor
张洪杰
王兴国
Original Assignee
贝普医疗科技有限公司
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 贝普医疗科技有限公司 filed Critical 贝普医疗科技有限公司
Priority to EP20756008.7A priority Critical patent/EP3925652B1/en
Priority to KR1020217028415A priority patent/KR102610898B1/ko
Priority to AU2020222607A priority patent/AU2020222607B2/en
Priority to BR112021016203-8A priority patent/BR112021016203A2/pt
Priority to CA3130414A priority patent/CA3130414C/en
Priority to MX2021009736A priority patent/MX2021009736A/es
Priority to US17/430,911 priority patent/US20220080130A1/en
Publication of WO2020164382A1 publication Critical patent/WO2020164382A1/zh
Priority to CONC2021/0012123A priority patent/CO2021012123A2/es

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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
    • 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
    • A61M5/3202—Devices for protection of the needle before use, e.g. caps
    • 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
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • 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
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3275—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel being connected to the needle hub or syringe by radially deflectable members, e.g. longitudinal slats, cords or bands
    • 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
    • A61M5/3293—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 characterised by features of the needle hub
    • 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
    • A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
    • A61M5/346—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub friction fit
    • 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
    • A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
    • A61M5/348—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub snap lock, i.e. upon axial displacement of needle assembly
    • 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
    • A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
    • A61M2005/3104—Caps for syringes without needle
    • 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
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3247—Means to impede repositioning of protection sleeve from needle covering to needle uncovering position

Definitions

  • the invention relates to the technical field of syringes, in particular to a safe insulin needle.
  • the needle includes a needle tube, a safety sheath, and a needle seat.
  • the needle tube is arranged on the central axis of the needle seat and distributed along the central axis.
  • the lower part of the needle seat forms an assembly cavity, and the lower end of the needle tube extends into the assembly cavity.
  • the upper part of the seat forms a needle tube assembly base, and the upper end of the needle tube extends upward to the upper part of the needle tube assembly base.
  • a safety sheath is sleeved on the outside of the needle holder, and a locking structure is formed between the inner wall of the inner cavity of the safety sheath and the outer wall of the needle holder;
  • the safety sheath is composed of an upper part and a lower part, the inner cavity of the safety sheath is hollow, and at least one positioning vertical bar is distributed on the inner wall of the inner cavity of the lower part of the safety sheath, wherein the lower end of the positioning vertical bar is biased to one side to form a limit Position steps, the limit steps are distributed on the inner wall of the inner cavity of the lower part of the safety sheath in a convex shape;
  • the safety sheath is composed of an upper part and a lower part, the inner cavity of the safety sheath is hollow, and the inner cavity of the upper part of the safety sheath
  • the inner wall is provided with a limiting convex strip, the limiting convex strip is provided with a convex point, the lower end surface of the limiting conve
  • the limiting strip is matched with the positioning vertical strip, and the lower end of the limiting strip is formed with the above limiting A step-fitting limit plane; the outer wall of the needle tube assembly base forms a slideway that cooperates with the limiting protrusion, and the surface of the slideway is provided with lower bumps and upper bumps distributed up and down, one side of the upper end of the slideway A convex transition slope is provided.
  • One side of the transition slope forms a locking zone, and one side of the locking zone forms a convex blocking block.
  • the locking zone is located between the transition slope and the blocking block.
  • the inner side of the transition slope forms an anti-reverse platform.
  • the anti-reversal platform on both sides of the locking area and the inner side walls of the blocking block are flat walls, and the inner side walls on both sides are used to limit the limit protrusions.
  • the lower end of the locking area forms a limit platform, which is used for cooperation
  • the slideways and locking areas are alternately distributed on the outer wall of the needle tube assembly base, and a locking area is provided between adjacent slideways; the lower edge of the locking area is provided
  • a limit block protruding from the outer wall of the needle tube assembly base, and the limit block cooperates with the above-mentioned limit ring to block the upward displacement of the limit ring.
  • the structure between the upper part of the needle base and the upper part of the safety sheath is not stable enough, and the safety sheath may fall off after self-locking, and needs to be redesigned.
  • the present invention provides a safe insulin needle.
  • a safety insulin needle including a sheath, a needle tube, a safety sheath, a pressure seat and a needle seat; the needle tube is arranged on the central axis of the needle seat, and the needle
  • the upper outer jacket of the seat is connected with a pressing seat, and the overall outer jacket of the needle seat and the pressing seat is connected with a safety sheath.
  • the upper part of the safety sheath is connected with the pressing seat.
  • the needle tube passes through the upper top of the safety sheath.
  • the lower part of the safety sheath is connected and matched with the lower part of the needle holder, the safety sheath and the overall outer cover of the needle tube are connected with a sheath, and the lower part of the sheath is connected and matched with the lower part of the safety sheath;
  • the inner cavity of the sheath is hollow, the upper part of the sheath is in the shape of a hollow truncated cone, the lower part of the sheath is in the shape of a cylinder, the diameter of the lower part of the sheath is larger than the diameter of the lower edge of the upper part of the sheath, and the upper and lower parts of the sheath are connected
  • a ring-shaped first positioning step is formed at the position, the top of the upper part of the sheath is closed, and the inner wall of the lower part of the sheath is evenly distributed along the circumferential direction with two first inner ring vertical bars, and the first inner ring vertical bars are along the axis
  • the inner cavity of the safety sheath is hollow, the upper and lower parts of the safety sheath are cylindrical, the upper top of the safety sheath is provided with a needle hole, and the diameter of the upper part of the safety sheath is smaller than the diameter of the lower part of the safety sheath.
  • connection between the upper part and the lower part of the sheath forms an annular second positioning step, and the second positioning step is axially limited in cooperation with the first positioning step of the sheath;
  • the outer wall of the lower part of the safety sheath is provided with a The outer positioning boss of the ring, the outer wall of the lower part of the safety sheath is also evenly distributed along the circumferential direction with more than two outer positioning strips, the outer positioning strips are arranged in the axial direction and the lower end is connected to the outer positioning boss, the lower outer wall of the safety sheath
  • the vacant surface between the upper outer positioning strips is for the insertion of the first inner ring vertical strip of the sheath and the two are interference fit;
  • Second inner ring vertical bars and at least one first positioning vertical bar evenly distributed on the inner wall of the upper part of the safety sheath along the circumferential direction, and the second inner ring vertical bars and the first positioning vertical bars are both along the axial direction.
  • the first positioning vertical bar is provided with a convex point, the lower end of the first positioning vertical bar is provided with limit protrusions protruding toward both sides, and the lower edge of the inner wall of the upper part of the safety sheath extends downward and exceeds
  • the inner wall of the upper part of the safety sheath is provided with a circle of inner limiting bosses along the lower edge;
  • the inner wall of the lower part of the safety sheath is evenly distributed along the circumferential direction with two or more third inner ring vertical bars and at least one first Two positioning vertical bars, the third inner ring vertical bars and the second positioning vertical bars are both arranged along the axial direction, and the lower end of the second positioning vertical bar is provided with a limiting step protrusion that is biased to one side;
  • the pressure seat is cylindrical, and the upper edge of the outer wall of the pressure seat is evenly distributed with two or more limit bosses along the circumferential direction.
  • the outer side of the limit boss is attached to the inner wall of the upper part of the safety sheath, and the limit boss is in contact with
  • the inner limit boss of the safety sheath is axially limited, and a limit opening is formed between two adjacent limit bosses, and the limit opening is upwards for the second inner ring vertical bar and the first positioning vertical bar of the safety sheath
  • the upper surface of each of the limit bosses is provided with a limit block, the anti-reverse tooth groove is formed between two adjacent limit blocks, and the first positioning of the limit block, the anti-reverse tooth groove and the safety sheath
  • the limit protrusion at the lower end of the vertical bar is matched; the outer wall of the pressure seat is evenly distributed along the circumferential direction with two or more outer guide ribs, and the outer guide ribs are correspondingly arranged with the limit boss, and the outer
  • the middle part of the inner wall of the pressure seat is evenly distributed with more than two buckle protrusions in the circumferential direction
  • the lower part of the inner wall of the pressure seat is evenly distributed with more than two inner guide ribs in the circumferential direction.
  • the inner guide ribs are arranged along the axial direction;
  • the upper part of the needle holder is in a circular tube shape, and the outer wall of the upper part of the needle holder is evenly distributed with two or more guide fixing ribs along the circumferential direction.
  • the guide fixing ribs are arranged in the axial direction and cooperate with the inner guide ribs of the pressing seat to guide the fixing ribs.
  • the upper part is provided with a bayonet which is matched with the buckle protrusion of the pressing seat;
  • the lower part of the needle seat is cylindrical, the upper end surface of the lower part of the needle seat is axially limited and matched with the second positioning step of the safety sheath, and the lower part of the needle seat
  • Two or more limit vertical bars and at least one limit bar are evenly distributed on the outer wall along the circumferential direction, and the limit vertical bars and the limit bars are arranged along the axial direction and are connected with the third inner ring vertical bar of the safety sheath
  • the second positioning vertical bar is matched, and the lower end of the limiting bar is matched with the limiting step protrusion on the lower end of the second positioning vertical bar of the safety sheath;
  • the inner cavity of the lower part of the needle seat is provided with a radial platform, so The upper part of the radial platform is connected with the upper part of the needle seat, the radial platform is matched with the inner limit boss of the safety sheath and the lower
  • At least one of the lower end of the first inner ring vertical bar of the sheath, the upper end of the outer positioning bar of the safety sheath, the upper end of the first positioning vertical bar of the safety sheath, and the upper end of the guide fixing rib of the needle holder One has a triangular head shape.
  • the inner limiting boss is connected to the lower end of the second inner ring vertical bar, and a portion of the inner limiting boss corresponding to the lower end of the first positioning vertical bar is provided with a notch.
  • the upper end of the outer guide rib of the pressing seat is connected with the corresponding limiting boss.
  • a limit platform arranged in the circumferential direction, and the limit platform cooperates with the lower end of the third inner ring vertical bar of the safety sheath to prevent The safety sheath moves downward in the axial direction.
  • the lower end of the limit bar is a flat surface to match with the convex plane of the limit step on the side of the lower end of the second positioning vertical bar of the safety sheath.
  • the needle tube is fixed to the upper part of the needle seat, the upper end of the needle tube passes upwards out of the upper top of the needle seat, and passes through the needle hole of the safety sheath, and the lower end of the needle tube passes downward through the radial platform and extends To the inner cavity of the lower part of the needle seat.
  • the present invention has the beneficial effects: the pressure seat is added, and the connection structure of the pressure seat, the safety sheath and the needle seat is redesigned, and the circumferential and axial self-locking of the safety sheath can be realized.
  • the stability of the safety sheath on the axial plane is enhanced, the stability of the entire structure is ensured, and the safety factor of the product is improved.
  • the whole product is small in size, has a compact and high degree of coordination between components, and can be assembled at once.
  • Figure 1 is a cross-sectional view of the present invention.
  • Figure 2 is an exploded schematic diagram of the present invention.
  • Figure 3 is a schematic diagram of the structure of the sheath in the present invention.
  • Figure 4 is a schematic structural diagram of the safety sheath in the present invention.
  • Fig. 5 is another structural diagram of the safety sheath in the present invention.
  • Fig. 6 is a cross-sectional view of the three-dimensional structure of the safety sheath in the present invention.
  • Fig. 7 is a schematic diagram of the structure of the pressing seat in the present invention.
  • Fig. 8 is a cross-sectional view of the pressing seat in the present invention.
  • Fig. 9 is another structural diagram of the pressing seat in the present invention.
  • Figure 10 is a schematic view of the structure of the needle holder in the present invention.
  • Figure 11 is a front view of the needle hub in the present invention.
  • Fig. 12 is another structural diagram of the needle holder in the present invention.
  • Figure 13 is a schematic diagram of the installation position of the needle tube in the present invention.
  • Figure 14 is a schematic diagram of the assembly structure of the present invention and the insulin pen.
  • Figure 15 is a schematic diagram of the state of use of the present invention and the insulin pen.
  • Figure 16 is a schematic diagram of the present invention in use with the sheath removed.
  • Figure 17 is a cross-sectional view of the safety sheath of the present invention in a locked state.
  • Figure 18 is a perspective view of the safety sheath of the present invention in a locked state.
  • a safety insulin needle includes a sheath 1, a needle tube 2, a safety sheath 3, a pressure seat and a needle seat 5; the needle tube 2 is arranged on the central axis of the needle seat 5, and the needle
  • the upper outer sleeve of the seat 5 is connected with a pressure seat, and the overall outer sleeve of the needle seat 5 and the pressure seat is connected with a safety sheath 3.
  • the upper part of the safety sheath 3 is connected with the pressure seat, and the needle tube 2 is connected from the upper top of the safety sheath 3 Passing out, the lower part of the safety sheath 3 is connected and matched with the lower part of the needle hub 5, the overall outer cover of the safety sheath 3 and the needle tube 2 is connected with a sheath 1, and the lower part of the sheath 1 is connected and matched with the lower part of the safety sheath 3 .
  • the inner cavity of the sheath 1 is hollow, and the upper part of the sheath 1 is in the shape of a hollow truncated cone, which mainly covers the needle tube 2 and protects it in an unused state;
  • the lower part of the sheath 1 is cylindrical ,
  • the diameter of the lower part of the sheath 1 is larger than the diameter of the lower edge of the upper part of the sheath 1, so that the connection between the upper part and the lower part of the sheath 1 forms a ring-shaped first positioning step 101, and the top of the upper part of the sheath 1 is closed.
  • More than two first inner ring vertical bars 102 are evenly distributed along the circumferential direction on the inner wall of the lower part.
  • the first inner ring vertical bars 102 are arranged along the axial direction.
  • the lower end of the first inner ring vertical bars 102 is in the shape of a triangular head. guide.
  • the inner cavity of the safety sheath 3 is hollow, the upper and lower parts of the safety sheath 3 are both cylindrical, and the upper top of the safety sheath 3 is concentrically provided with a needle hole 301 for the upper end of the needle tube 2 to pass through.
  • the diameter of the upper part of the safety sheath 3 is smaller than the diameter of the lower part of the safety sheath 3, so that the connection between the upper part and the lower part of the safety sheath 3 forms an annular second positioning step 302, the second positioning step 302 and the above-mentioned sheath 1
  • the first positioning step 101 is axially limited and matched, and the second positioning step 302 is pressed upward against the first positioning step 101 to prevent the safety sheath 3 from continuing to move into the upper part of the sheath 1; the upper edge of the outer wall of the lower part of the safety sheath 3
  • the lower edge is provided with a ring of outer positioning bosses 303.
  • outer positioning bars 304 On the outer wall of the lower part of the safety sheath 3, there are more than two outer positioning bars 304 evenly distributed in the circumferential direction.
  • the outer positioning bars 304 are arranged in the axial direction and the lower end is connected to the outer positioning protrusions.
  • the upper end of the outer positioning strip 304 On the platform 303, the upper end of the outer positioning strip 304 is in the shape of a triangular head, and the remaining part on the outer wall of the lower part of the safety sheath 3 forms a void surface 305.
  • the void surface 305 between the two or more outer positioning strips 304 is provided for the sheath 1
  • the first inner ring vertical bar 102 is inserted and the vacant surface 305 is in an interference fit with the first inner ring vertical bar 102 to prevent the safety sheath 3 and the sheath 1 from rotating relative to each other, and can only move relatively axially.
  • more than two second inner ring vertical bars 306 and at least one first positioning vertical bar 307 are evenly distributed on the inner wall of the upper part of the safety sheath 3 along the circumferential direction.
  • 306 and the first vertical positioning bar 307 are both arranged along the axial direction, the first vertical positioning bar 307 is provided with a convex point 308, the upper end of the first vertical positioning bar 307 is triangular, and the lower end of the first vertical positioning bar 307 A limiting protrusion 309 protruding toward both sides is provided.
  • the lower edge of the inner wall of the upper part of the safety sheath 3 extends downward and exceeds the position of the second positioning step 302.
  • the upper inner wall of the safety sheath 3 runs along the lower edge
  • a ring of inner limiting boss 310 is provided, and the inner limiting boss 310 is connected to the lower end of the second inner ring vertical bar 306, and the part of the inner limiting boss 310 corresponding to the lower end of the first positioning vertical bar 307 is provided with a gap 311;
  • the inner wall of the lower part of the safety sheath 3 is evenly distributed along the circumferential direction with two or more third inner ring vertical bars 312 and at least one second positioning vertical bar 313, the third inner ring vertical bar 312 and the second positioning
  • the vertical bars 313 are all arranged along the axial direction, and the lower end of the second positioning vertical bar 313 is provided with a limiting step protrusion 314 biased to one side.
  • the pressure seat is cylindrical, and the upper edge of the outer wall of the pressure seat is evenly distributed with two or more limit bosses 401 along the circumferential direction.
  • the outer surface of the limit boss 401 and the safety sheath 3 The inner wall of the upper part is fitted together, and the limiting boss 401 is axially limited in cooperation with the inner limiting boss 310 of the safety sheath 3, and a limit opening 402 and a limit opening 402 are formed between two adjacent limit bosses 401
  • a limit block 403 is provided on the upper surface, and an anti-reverse tooth groove 404 is formed between two adjacent limit blocks 403.
  • the limit block 403, the anti-reverse tooth groove 404 and the lower end of the first positioning vertical bar 307 of the safety sheath 3 cooperate to prevent the first positioning vertical bar 307 from moving in the circumferential and axial directions; on the outer wall of the pressure seat, there are more than two outer guide ribs 405 evenly distributed along the circumferential direction.
  • the outer guide ribs 405 and the limit bosses 401 are arranged correspondingly, the outer guide ribs 405 are arranged in the axial direction and the upper end is connected with the corresponding limit bosses 401, the outer guide ribs 405 are opposed to the second part of the safety sheath 3
  • the inner ring vertical bar 306 and the first positioning vertical bar 307 play the role of limiting and guiding.
  • the middle of the inner wall of the pressure seat is evenly distributed with more than two buckle protrusions 407 along the circumferential direction
  • More than two inner guide ribs 408 are evenly distributed along the circumferential direction on the lower part of the inner wall of the pressure seat.
  • the inner guide ribs 408 are arranged along the axial direction, and a guide groove 409 is formed between two adjacent inner guide ribs 408.
  • the upper part of the needle holder 5 serves as a needle tube assembly base
  • the upper part of the needle holder 5 is in a circular tube shape
  • the outer wall of the upper part of the needle holder 5 is evenly distributed with more than two guiding and fixing ribs 501 along the circumferential direction.
  • the guiding and fixing rib 501 is arranged in the axial direction and the upper end is in the shape of a triangular head.
  • the guiding and fixing rib 501 cooperates with the inner guiding rib 408 and the guiding groove 409 of the pressure seat to prevent relative rotation of the needle seat 5 and the pressure seat, and guide the fixing rib 501
  • a bayonet 502 is provided.
  • the bayonet 502 cooperates with the buckle protrusion 407 of the pressure seat to prevent relative axial movement of the needle seat 5 and the pressure seat.
  • the lower part of the needle seat 5 serves as the insulin pen assembly base, and the needle seat 5
  • the lower part of the needle holder 5 is cylindrical, and the upper end surface of the lower part of the needle holder 5 matches the axial limit of the second positioning step 302 of the safety sheath 3, and the outer wall of the lower part of the needle holder 5 is evenly distributed along the circumferential direction with two or more limit verticals.
  • a bar 503 and at least one limit bar 504, the limit vertical bar 503 and the limit bar 504 are both arranged along the axial direction, and a circumferential limit is provided between the lower ends of two adjacent limit vertical bars 503
  • the stand 505, the limiting vertical bar 503 and the limiting bar 504 cooperate with the third inner ring vertical bar 312 and the second positioning vertical bar 313 of the safety sheath 3 to prevent the needle holder 5 and the safety sheath 3 from rotating relative to each other.
  • the position table 505 cooperates with the lower end of the third inner ring vertical bar 312 of the safety sheath 3 to prevent the safety sheath 3 from moving downward in the axial direction.
  • the lower end of the limit bar 504 is a flat surface.
  • the lower end is matched with the limit step protrusion 314 on the lower end of the second positioning vertical bar 313 of the safety sheath 3, and when the safety sheath 3 is rotated clockwise, the plane of the lower end of the limit strip 504 and the safety sheath 3 The plane of the limit step protrusion 314 of the needle seat is occluded. At this time, the needle holder 5 and the safety sheath 3 cannot move relative to the axial direction. When the safety sheath 3 is rotated counterclockwise, it can be unlocked; the inner cavity of the lower part of the needle holder 5 is provided with a radial A platform 506. The upper part of the radial platform 506 is connected to the upper part of the needle holder 5.
  • the radial platform 506 is axially restricted in cooperation with the inner limit boss 310 of the safety sheath 3 and the lower end surface of the pressure seat.
  • the part of the inner wall corresponding to the lower part of the radial platform 506 is provided with an internal thread 507.
  • the needle tube 2 is fixed to the upper part of the needle hub 5.
  • the upper end of the needle tube 2 penetrates upwards from the upper top end of the needle hub 5, and passes through the needle hole 301 of the safety sheath 3, and the lower end of the needle tube 2 faces It passes through the radial platform 506 and extends into the inner cavity of the lower part of the needle seat 5.
  • the safety insulin needle and insulin pen 6 need to be assembled before insulin injection.
  • the sheath 1 will drive the safety sheath 3 to rotate synchronously.
  • the lower end of the second positioning bar 313 of the safety sheath 3 The plane of the limit step protrusion 314 on one side is engaged with the plane of the lower end of the limit bar 504 of the needle holder 5 to prevent the safety sheath 3 from being pulled out when the sheath 1 is pulled out.
  • the end of the insulin pen 6 is connected by a threaded connection. Into the inner cavity of the lower part of the needle seat 5. Referring to FIG.
  • the convex point 308 on the first positioning vertical bar 307 of the safety sheath 3 is in interference fit with the convex rib 406 of the pressing seat.
  • the convex point 308 is below the convex rib 406, and the convex rib 406 blocks the convex point 308. , Prevent the safety sheath 3 from moving upwards non-artificially, realizing double protection.
  • the first positioning vertical bar 307 moves upward to above the corresponding limit opening 402, and the lower end of the first positioning vertical bar 307 faces
  • the limiting protrusions 309 protruding on both sides cooperate with the limiting block 403 and the anti-reverse tooth groove 404 of the pressing seat 4.
  • the limiting block 403 prevents the first positioning vertical bar 307 from rotating in the circumferential direction
  • the anti-reverse tooth groove 404 prevents the first A vertical positioning bar 307 retreats in the axial direction
  • the safety sheath 3 cannot rotate in the circumferential direction and cannot move in the axial direction, completing self-locking, and the needle tube 2 is completely covered by the safety sheath 3 to realize safety protection.

Abstract

一种安全胰岛素针，包括护套（1）、针管（2）、安全护套（3）、压座（4）和针座（5）；针管（2）设置于针座（5）的中心轴线上，针座（5）的上部外套接有压座（4），针座（5）和压座（4）的整体外套接有安全护套（3），安全护套（3）的上部与压座（4）连接配合，针管（2）从安全护套（3）的上部顶端穿出，安全护套（3）的下部与针座（5）的下部连接配合，安全护套（3）和针管（2）的整体外套接有护套（1），护套（1）的下部与安全护套（3）的下部连接配合。增加了压座（4），并重新设计了压座（4）与安全护套（3）、针座（5）的连接结构，在能实现安全护套（3）的周向和轴向自锁的同时，增强了安全护套（3）在轴向平面上的稳定性，确保了整个结构的稳固性，提高了产品的安全系数。整个产品体积小，部件间的配合紧凑、配合度高，可一次性组装完成。

Description

一种安全胰岛素针 技术领域
本发明涉及注射器技术领域，特别涉及一种安全胰岛素针。
背景技术
对比文件1，申请号：CN201810117903.6，申请日：2018-02-06，公开号：CN108404257A，公开日：2018-08-17，申请人：贝普医疗科技有限公司，公开了一种安全胰岛素针，包括针管、安全护套、针座，其中，针管设置于针座的中心轴上，并沿中心轴分布，针座的下部形成一装配腔，针管的下端延伸至该装配腔内，针座的上部形成针管装配基座，针管的上端向上延伸至针管装配基座上部，针座的外部套接有一安全护套，安全护套内腔内壁与针座的外壁之间形成锁定结构；所述安全护套由上部和下部构成，安全护套的内腔呈中空状，安全护套下部的内腔内壁上分布有至少一根定位竖条，其中，定位竖条的下端偏向一侧形成限位台阶，限位台阶在安全护套下部的内腔内壁上呈凸起状分布；所述安全护套由上部和下部构成，安全护套的内腔呈中空状，安全护套上部的内腔内壁上设有限位凸条，该限位凸条上设有一凸点，限位凸条的下端面处形成平面，限位凸条与安全护套的轴向呈平行分布；所述安全护套内腔的内壁上设有环状分布的限位圈，该限位圈在内腔的内壁上呈凸起状设置；所述安全护套上部的顶端开设有穿针孔；所述装配腔的外壁上分布有至少一根限位条，所述限位条在装配腔的外壁上均呈凸起状分布，限位条与上述定位竖条相配合，限位条的下端形成与上述限位台阶配合的限位平面；所述针管装配基座的外壁处形成与限位凸条配合的滑道，该滑道表面设置有上下分布的下凸点和上凸点，滑道上端的一侧设有凸起状的过渡斜面，过渡斜面的一侧形成锁定区，锁定区的一侧形成凸起状的阻挡块，锁定区位于过渡斜面和阻挡块之间，过渡斜面内侧形成防逆平台，锁定区两侧的防逆平台和阻挡块的内侧壁均为平壁，两侧的 内侧壁用于对限位凸条进行限位，锁定区的下端形成限位平台，限位平台用于配合上述限位凸条下端的平面，所述滑道与锁定区在针管装配基座的外壁处呈交替分布，相邻的滑道之间设有一锁定区；所述锁定区的下缘处设有凸出于针管装配基座外壁的限位块，该限位块与上述限位圈配合，用于阻挡限位圈向上位移。
该安全胰岛素针中，针座的上部和安全护套的上部之间的结构不够稳固，安全护套在自锁后有脱落风险，需要重新设计。
发明内容
本发明针对上述问题，提供一种安全胰岛素针。
本发明的目的可以通过下述技术方案来实现：一种安全胰岛素针，包括护套、针管、安全护套、压座和针座；所述针管设置于针座的中心轴线上，所述针座的上部外套接有压座，针座和压座的整体外套接有安全护套，所述安全护套的上部与压座连接配合，针管从安全护套的上部顶端穿出，安全护套的下部与针座的下部连接配合，安全护套和针管的整体外套接有护套，所述护套的下部与安全护套的下部连接配合；
所述护套的内腔中空，护套的上部呈中空圆锥台状，护套的下部呈圆筒状，护套下部的直径大于护套上部的下缘直径，护套的上部和下部的连接处形成环状的第一定位台阶，护套上部的顶端呈封闭状，护套下部的内壁上沿周向均布有两个以上的第一内圈竖条，所述第一内圈竖条沿轴向设置；
所述安全护套的内腔中空，安全护套的上部和下部均呈圆筒状，安全护套的上部顶端开设有穿针孔，安全护套上部的直径小于安全护套下部的直径，安全护套的上部和下部的连接处形成环状的第二定位台阶，所述第二定位台阶与护套的第一定位台阶轴向限位配合；安全护套下部的外壁上沿下缘设有一圈外定位凸台，安全护套下部的外壁上还沿周向均布有两个以上的外定位条，所述外定位条沿轴向设置且下端连接于外定位凸台上，安全护套下部外壁上的外定 位条间的空位面供护套的第一内圈竖条插入且两者过盈配合；
所述安全护套上部的内壁上沿周向均布有两个以上的第二内圈竖条和至少一个第一定位竖条，所述第二内圈竖条和第一定位竖条均沿轴向设置，所述第一定位竖条上设有一凸点，第一定位竖条的下端设有朝两侧凸出的限位凸起，所述安全护套上部的内壁下缘向下延伸并超过第二定位台阶的位置，安全护套上部的内壁沿下缘设有一圈内限位凸台；安全护套下部的内壁上沿周向均布有两个以上的第三内圈竖条和至少一个第二定位竖条，所述第三内圈竖条和第二定位竖条均沿轴向设置，所述第二定位竖条的下端设有偏向一侧的限位台阶凸起；
所述压座呈圆筒状，压座的外壁上缘沿周向均布有两个以上的限位凸台，限位凸台的外侧面与安全护套上部的内壁贴合，限位凸台与安全护套的内限位凸台轴向限位配合，相邻两个限位凸台之间构成限位口，限位口供安全护套的第二内圈竖条和第一定位竖条向上穿过，每个所述限位凸台的上表面设有限位块，相邻两个限位块之间构成防逆齿槽，限位块、防逆齿槽与安全护套的第一定位竖条下端的限位凸起配合；压座的外壁上沿周向均布有两个以上的外导向筋，所述外导向筋与限位凸台一一起对应设置，外导向筋沿轴向设置且与安全护套的第二内圈竖条和第一定位竖条相配合，相邻两个外导向筋的上端之间设有沿周向设置的凸筋，凸筋与安全护套的第一定位竖条上的凸点之间过盈配合；压座内壁的中部沿周向均布有两个以上的卡扣凸起，压座内壁的下部沿周向均布有两个以上的内导向筋，所述内导向筋沿轴向设置；
所述针座的上部呈圆管状，针座上部的外壁沿周向均布有两个以上的导向固定筋，所述导向固定筋沿轴向设置且与压座的内导向筋相配合，导向固定筋上设有与压座的卡扣凸起相配合的卡口；针座的下部呈圆筒状，针座下部的上端面与安全护套的第二定位台阶轴向限位配合，针座下部的外壁上沿周向均布有两个以上的限位竖条和至少一个限位条，所述限位竖条和限位条均沿轴向设 置且与安全护套的第三内圈竖条和第二定位竖条相配合，所述限位条的下端与安全护套的第二定位竖条下端一侧的限位台阶凸起相配合；针座下部的内腔设有一径向平台，所述径向平台上面连接针座的上部，径向平台与安全护套的内限位凸台和压座的下端面轴向限位配合，针座下部内壁的对应径向平台下面的部分设有内螺纹。
进一步地，所述护套的第一内圈竖条的下端、安全护套的外定位条的上端、安全护套的第一定位竖条的上端、针座的导向固定筋的上端中的至少一个呈三角头状。
进一步地，所述内限位凸台与第二内圈竖条的下端连接，内限位凸台的对应第一定位竖条下端的部分开设有缺口。
进一步地，所述压座的外导向筋的上端与对应的限位凸台连接。
进一步地，所述针座的相邻两个限位竖条的下端之间设有沿周向设置的限位台，限位台与安全护套的第三内圈竖条的下端配合，防止安全护套沿轴向向下移动。
进一步地，所述限位条的下端为平面，以与安全护套的第二定位竖条下端一侧的限位台阶凸起的平面相配合。
进一步地，所述针管与针座的上部固定，针管的上端向上穿出针座的上部顶端，并且从安全护套的穿针孔穿出，针管的下端向下穿过径向平台，并延伸至针座下部的内腔内。
与现有技术相比，本发明的有益效果：增加了压座，并重新设计了压座与安全护套、针座的连接结构，在能实现安全护套的周向和轴向自锁的同时，增强了安全护套在轴向平面上的稳定性，确保了整个结构的稳固性，提高了产品的安全系数。整个产品体积小，部件间的配合紧凑、配合度高，可一次性组装完成。
附图说明
图1为本发明的剖视图。
图2为本发明的分解示意图。
图3为本发明中的护套的结构示意图。
图4为本发明中的安全护套的结构示意图。
图5为本发明中的安全护套的另一结构示意图。
图6为本发明中的安全护套立体结构的剖视图。
图7为本发明中的压座的结构示意图。
图8为本发明中的压座的剖视图。
图9为本发明中的压座的另一结构示意图。
图10为本发明中的针座的结构示意图。
图11为本发明中的针座的正视图。
图12为本发明中的针座的另一结构示意图。
图13为本发明中的针管的安装位置示意图。
图14为本发明和胰岛素笔的装配结构示意图。
图15为本发明和胰岛素笔的使用状态示意图。
图16为本发明去掉护套的使用状态示意图。
图17为本发明中的安全护套处于锁定状态的剖视图。
图18为本发明中的安全护套处于锁定状态的立体图。
图中部件标号如下：
1 护套
101 第一定位台阶
102 第一内圈竖条
2 针管
3 安全护套
301 穿针孔
302 第二定位台阶
303 外定位凸台
304 外定位条
305 空位面
306 第二内圈竖条
307 第一定位竖条
308 凸点
309 限位凸起
310 内限位凸台
311 缺口
312 第三内圈竖条
313 第二定位竖条
314 限位台阶凸起
4 压座
401 限位凸台
402 限位口
403 限位块
404 防逆齿槽
405 外导向筋
406 凸筋
407 卡扣凸起
408 内导向筋
409 导向槽
5 针座
501 导向固定筋
502 卡口
503 限位竖条
504 限位条
505 限位台
506 径向平台
507 内螺纹
6 胰岛素笔。
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。
参见图1和图2，一种安全胰岛素针，包括护套1、针管2、安全护套3、压座和针座5；所述针管2设置于针座5的中心轴线上，所述针座5的上部外套接有压座，针座5和压座的整体外套接有安全护套3，所述安全护套3的上部与压座连接配合，针管2从安全护套3的上部顶端穿出，安全护套3的下部与针座5的下部连接配合，安全护套3和针管2的整体外套接有护套1，所述护套1的下部与安全护套3的下部连接配合。
参见图3，所述护套1的内腔中空，护套1的上部呈中空圆锥台状，主要盖住针管2并对其进行未使用状态下的保护；护套1的下部呈圆筒状，护套1下部的直径大于护套1上部的下缘直径，使得护套1的上部和下部的连接处形成环状的第一定位台阶101，护套1上部的顶端呈封闭状，护套1下部的内壁上沿周向均布有两个以上的第一内圈竖条102，所述第一内圈竖条102沿轴向设置，第一内圈竖条102的下端呈三角头状，便于导向。
参见图4，所述安全护套3的内腔中空，安全护套3的上部和下部均呈圆筒状，安全护套3的上部顶端同心开设有供针管2上端穿出的穿针孔301，安 全护套3上部的直径小于安全护套3下部的直径，使得安全护套3的上部和下部的连接处形成环状的第二定位台阶302，第二定位台阶302与上述护套1的第一定位台阶101轴向限位配合，第二定位台阶302向上抵住第一定位台阶101，防止安全护套3继续向护套1上部内移动；所述安全护套3下部的外壁上沿下缘设有一圈外定位凸台303，安全护套3下部的外壁上还沿周向均布有两个以上的外定位条304，所述外定位条304沿轴向设置且下端连接于外定位凸台303上，外定位条304的上端呈三角头状，安全护套3下部的外壁上的其余部分形成空位面305，两个以上的外定位条304之间的空位面305供上述护套1的第一内圈竖条102插入且空位面305与第一内圈竖条102之间过盈配合，防止安全护套3和护套1相对转动，仅可相对轴向移动。
参见图5和图6，所述安全护套3上部的内壁上沿周向均布有两个以上的第二内圈竖条306和至少一个第一定位竖条307，所述第二内圈竖条306和第一定位竖条307均沿轴向设置，所述第一定位竖条307上设有一凸点308，第一定位竖条307的上端呈三角头状，第一定位竖条307的下端设有朝两侧凸出的限位凸起309，所述安全护套3上部的内壁下缘向下延伸并超过上述的第二定位台阶302的位置，安全护套3上部的内壁沿下缘设有一圈内限位凸台310，所述内限位凸台310与第二内圈竖条306的下端连接，内限位凸台310的对应第一定位竖条307下端的部分开设有缺口311；所述安全护套3下部的内壁上沿周向均布有两个以上的第三内圈竖条312和至少一个第二定位竖条313，所述第三内圈竖条312和第二定位竖条313均沿轴向设置，所述第二定位竖条313的下端设有偏向一侧的限位台阶凸起314。
参见图7至图9，所述压座呈圆筒状，压座的外壁上缘沿周向均布有两个以上的限位凸台401，限位凸台401的外侧面与上述安全护套3上部的内壁贴合，限位凸台401与安全护套3的内限位凸台310轴向限位配合，相邻两个限位凸台401之间构成限位口402，限位口402供上述安全护套3的第二内圈竖 条306和第一定位竖条307向上穿过，并防止安全护套3在轴向平面上大幅度摆动，每个所述限位凸台401的上表面设有限位块403，相邻两个限位块403之间构成防逆齿槽404，限位块403、防逆齿槽404与上述安全护套3的第一定位竖条307下端的朝两侧凸出的限位凸起309配合，以防止第一定位竖条307在周向和轴向上移动；所述压座的外壁上沿周向均布有两个以上的外导向筋405，所述外导向筋405与限位凸台401一一起对应设置，外导向筋405沿轴向设置且上端与对应的限位凸台401连接，外导向筋405对上述安全护套3的第二内圈竖条306和第一定位竖条307起到限位和导向作用，相邻两个外导向筋405的上端之间设有沿周向设置的凸筋406，凸筋406与上述安全护套3的第一定位竖条307上的凸点308之间过盈配合，以限制安全护套3非人为的向上移动；压座内壁的中部沿周向均布有两个以上的卡扣凸起407，压座内壁的下部沿周向均布有两个以上的内导向筋408，所述内导向筋408沿轴向设置，相邻两个内导向筋408之间构成导向槽409。
参见图10至图12，所述针座5的上部作为针管装配基座，针座5的上部呈圆管状，针座5上部的外壁沿周向均布有两个以上的导向固定筋501，所述导向固定筋501沿轴向设置且上端呈三角头状，导向固定筋501与上述压座的内导向筋408和导向槽409相配合来防止针座5和压座相对转动，导向固定筋501上设有卡口502，卡口502与上述压座的卡扣凸起407相配合防止针座5和压座相对轴向移动，所述针座5的下部作为胰岛素笔装配基座，针座5的下部呈圆筒状，针座5下部的上端面与上述安全护套3的第二定位台阶302轴向限位配合，针座5下部的外壁上沿周向均布有两个以上的限位竖条503和至少一个限位条504，所述限位竖条503和限位条504均沿轴向设置，相邻两个限位竖条503的下端之间设有沿周向设置的限位台505，限位竖条503和限位条504与上述安全护套3的第三内圈竖条312和第二定位竖条313相配合来防止针座5和安全护套3相对转动，限位台505与安全护套3的第三内圈竖条312 的下端配合来防止安全护套3沿轴向向下移动，所述限位条504的下端为平面，所述限位条504的下端与上述安全护套3的第二定位竖条313下端一侧的限位台阶凸起314相配合，当顺时针转动安全护套3时，限位条504下端的平面与上述安全护套3的限位台阶凸起314平面相咬合，此时针座5和安全护套3无法相对轴向移动，当逆时针旋转安全护套3时即可解锁；针座5下部的内腔设有一径向平台506，所述径向平台506上面连接针座5的上部，径向平台506与上述安全护套3的内限位凸台310和压座的下端面轴向限位配合，针座5下部内壁的对应径向平台506下面的部分设有内螺纹507。
参见图13，所述针管2与针座5的上部固定，针管2的上端向上穿出针座5的上部顶端，并且从上述安全护套3的穿针孔301穿出，针管2的下端向下穿过径向平台506，并延伸至针座5下部的内腔内。
参见图14，进行胰岛素注射前需要将该安全胰岛素针和胰岛素笔6装配。在将该安全胰岛素针顺时针旋入到胰岛素笔6的端部的过程中，护套1会带动安全护套3同步旋转，同时见图15，安全护套3的第二定位竖条313下端一侧的限位台阶凸起314的平面与针座5的限位条504下端的平面相咬合，防止拔出护套1时拉出安全护套3，胰岛素笔6的端部通过螺纹连接装入针座5下部的内腔内。参见图16，安全护套3的第一定位竖条307上的凸点308与压座的凸筋406之间过盈配合，凸点308在凸筋406的下方，凸筋406阻挡凸点308，防止安全护套3非人为的向上移动，实现双重保护。
在取下护套1注射完成后，逆时针旋转安全护套3到位，使安全护套3的第二定位竖条313下端一侧的限位台阶凸起314与针座5的限位条504的下端相分离，然后向上拉动安全护套3，见图17和图18，使安全护套3的凸点308越过压座的凸筋406，安全护套3的内限位凸台310到达压座4的限位凸台401的下面，并向上抵住限位凸台401，此时安全护套3的第二内圈竖条306通过对应的限位口402向上移动，限位口402和第二内圈竖条306配合防止安全护 套3在轴向平面上大幅度摆动，第一定位竖条307则向上移动至对应的限位口402的上方，第一定位竖条307下端的朝两侧凸出的限位凸起309与压座4的限位块403、防逆齿槽404配合，限位块403防止第一定位竖条307在周向上转动，防逆齿槽404防止第一定位竖条307在轴向上回退，最终安全护套3在周向上无法转动且在轴向上无法移动，完成自锁，针管2被安全护套3完全罩住，实现安全保护。
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 (7)

  1. 一种安全胰岛素针，其特征在于，包括护套、针管、安全护套、压座和针座；所述针管设置于针座的中心轴线上，所述针座的上部外套接有压座，针座和压座的整体外套接有安全护套，所述安全护套的上部与压座连接配合，针管从安全护套的上部顶端穿出，安全护套的下部与针座的下部连接配合，安全护套和针管的整体外套接有护套，所述护套的下部与安全护套的下部连接配合；
    所述护套的内腔中空，护套的上部呈中空圆锥台状，护套的下部呈圆筒状，护套下部的直径大于护套上部的下缘直径，护套的上部和下部的连接处形成环状的第一定位台阶，护套上部的顶端呈封闭状，护套下部的内壁上沿周向均布有两个以上的第一内圈竖条，所述第一内圈竖条沿轴向设置；
    所述安全护套的内腔中空，安全护套的上部和下部均呈圆筒状，安全护套的上部顶端开设有穿针孔，安全护套上部的直径小于安全护套下部的直径，安全护套的上部和下部的连接处形成环状的第二定位台阶，所述第二定位台阶与护套的第一定位台阶轴向限位配合；安全护套下部的外壁上沿下缘设有一圈外定位凸台，安全护套下部的外壁上还沿周向均布有两个以上的外定位条，所述外定位条沿轴向设置且下端连接于外定位凸台上，安全护套下部外壁上的外定位条间的空位面供护套的第一内圈竖条插入且两者过盈配合；
    所述安全护套上部的内壁上沿周向均布有两个以上的第二内圈竖条和至少一个第一定位竖条，所述第二内圈竖条和第一定位竖条均沿轴向设置，所述第一定位竖条上设有一凸点，第一定位竖条的下端设有朝两侧凸出的限位凸起，所述安全护套上部的内壁下缘向下延伸并超过第二定位台阶的位置，安全护套上部的内壁沿下缘设有一圈内限位凸台；安全护套下部的内壁上沿周向均布有两个以上的第三内圈竖条和至少一个第二定位竖条，所 述第三内圈竖条和第二定位竖条均沿轴向设置，所述第二定位竖条的下端设有偏向一侧的限位台阶凸起；
    所述压座呈圆筒状，压座的外壁上缘沿周向均布有两个以上的限位凸台，限位凸台的外侧面与安全护套上部的内壁贴合，限位凸台与安全护套的内限位凸台轴向限位配合，相邻两个限位凸台之间构成限位口，限位口供安全护套的第二内圈竖条和第一定位竖条向上穿过，每个所述限位凸台的上表面设有限位块，相邻两个限位块之间构成防逆齿槽，限位块、防逆齿槽与安全护套的第一定位竖条下端的限位凸起配合；压座的外壁上沿周向均布有两个以上的外导向筋，所述外导向筋与限位凸台一一起对应设置，外导向筋沿轴向设置且与安全护套的第二内圈竖条和第一定位竖条相配合，相邻两个外导向筋的上端之间设有沿周向设置的凸筋，凸筋与安全护套的第一定位竖条上的凸点之间过盈配合；压座内壁的中部沿周向均布有两个以上的卡扣凸起，压座内壁的下部沿周向均布有两个以上的内导向筋，所述内导向筋沿轴向设置；
    所述针座的上部呈圆管状，针座上部的外壁沿周向均布有两个以上的导向固定筋，所述导向固定筋沿轴向设置且与压座的内导向筋相配合，导向固定筋上设有与压座的卡扣凸起相配合的卡口；针座的下部呈圆筒状，针座下部的上端面与安全护套的第二定位台阶轴向限位配合，针座下部的外壁上沿周向均布有两个以上的限位竖条和至少一个限位条，所述限位竖条和限位条均沿轴向设置且与安全护套的第三内圈竖条和第二定位竖条相配合，所述限位条的下端与安全护套的第二定位竖条下端一侧的限位台阶凸起相配合；针座下部的内腔设有一径向平台，所述径向平台上面连接针座的上部，径向平台与安全护套的内限位凸台和压座的下端面轴向限位配合，针座下部内壁的对应径向平台下面的部分设有内螺纹。
  2. 根据权利要求所述的安全胰岛素针，其特征在于，所述护套的第一内圈竖 条的下端、安全护套的外定位条的上端、安全护套的第一定位竖条的上端、针座的导向固定筋的上端中的至少一个呈三角头状。
  3. 根据权利要求所述的安全胰岛素针，其特征在于，所述内限位凸台与第二内圈竖条的下端连接，内限位凸台的对应第一定位竖条下端的部分开设有缺口。
  4. 根据权利要求所述的安全胰岛素针，其特征在于，所述压座的外导向筋的上端与对应的限位凸台连接。
  5. 根据权利要求所述的安全胰岛素针，其特征在于，所述针座的相邻两个限位竖条的下端之间设有沿周向设置的限位台，限位台与安全护套的第三内圈竖条的下端配合，防止安全护套沿轴向向下移动。
  6. 根据权利要求所述的安全胰岛素针，其特征在于，所述限位条的下端为平面，以与安全护套的第二定位竖条下端一侧的限位台阶凸起的平面相配合。
  7. 根据权利要求所述的安全胰岛素针，其特征在于，所述针管与针座的上部固定，针管的上端向上穿出针座的上部顶端，并且从安全护套的穿针孔穿出，针管的下端向下穿过径向平台，并延伸至针座下部的内腔内。
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