WO2011029264A1 - 针尖可回缩一次性安全注射器 - Google Patents

针尖可回缩一次性安全注射器 Download PDF

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Publication number
WO2011029264A1
WO2011029264A1 PCT/CN2010/000520 CN2010000520W WO2011029264A1 WO 2011029264 A1 WO2011029264 A1 WO 2011029264A1 CN 2010000520 W CN2010000520 W CN 2010000520W WO 2011029264 A1 WO2011029264 A1 WO 2011029264A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
syringe
self
diameter
core rod
Prior art date
Application number
PCT/CN2010/000520
Other languages
English (en)
French (fr)
Inventor
毛一武
Original Assignee
常州和康医疗器材有限公司
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
Priority claimed from CN2009203100576U external-priority patent/CN201492767U/zh
Priority claimed from CN2009203110173U external-priority patent/CN201492777U/zh
Application filed by 常州和康医疗器材有限公司 filed Critical 常州和康医疗器材有限公司
Priority to BR112012005102A priority Critical patent/BR112012005102A2/pt
Priority to CN2010900011463U priority patent/CN202844269U/zh
Priority to US13/395,402 priority patent/US20120172799A1/en
Priority to RU2012113827/14A priority patent/RU2012113827A/ru
Priority to AU2010292789A priority patent/AU2010292789A1/en
Publication of WO2011029264A1 publication Critical patent/WO2011029264A1/zh

Links

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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31501—Means for blocking or restricting the movement of the rod or piston
    • A61M5/31505—Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit
    • A61M2005/31506—Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit formed as a single piece, e.g. moulded
    • 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
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • 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
    • 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
    • A61M5/347—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub rotatable, e.g. bayonet or screw

Definitions

  • the present invention relates to a disposable safety syringe, and more particularly to a disposable safety syringe with a needle tip retractable. Background technique
  • the hypodermic syringe To avoid cross-contamination when entering or removing media from humans or animals, the hypodermic syringe must be used once and disposed of as waste after use.
  • the most widely used disposable syringes today consist of a cavity syringe, a needle, and a fixed-range piston that fits within the barrel.
  • the biggest problem with this kind of syringe is that after the injection is completed, the needle remains outside, which not only causes inconvenience to the handling and destruction of the syringe garbage, but also may injure the medical staff due to carelessness, causing the second time of the bacteria. Cross-infection has become a medical hazard that cannot be ignored, so there has been a disposable safety syringe with a needle retractable.
  • the retraction of the needle tip is achieved by manually pulling the needle through the core rod, and the needle holder and the syringe of the syringe are positioned through the outside of the needle holder.
  • the annular boss and the annular card slot on the barrel are connected; and the needle is exposed to prevent the force of the core rod from being pulled out of the syringe, and the core rod is exposed in order to prevent the needle from being pushed back to pierce the needle barrel.
  • the upper collar is engaged with the elastic convex claw of the annular ring of the ring at the bottom of the cylinder to lock the core head and die at the bottom of the cylinder.
  • the interference fit connection method makes the needle seat not easy to be positioned in the syringe, and the assembly is difficult. It is easy to cause the annular boss to escape from the annular card slot due to excessive force; During the injection process, the injection support force of the needle seat is not strong and unstable, and it is easy to rotate, which causes great discomfort to the patient. In addition, after the injection, the needle holder is manually overcome to overcome the annular boss and the annular card slot. The snap connection, the resistance is very large, the pull is laborious and very difficult to operate. Moreover, since the elastic convex claw is a deformable structure, the locking effect is very bad.
  • the core rod can still be pulled out or pushed back into the syringe, thereby causing the needle tip to be outside.
  • ⁇ that is, the failure of the self-destruction of the syringe not only poses a safety hazard to the waste disposal, but also is easily reused by the lawless elements. Therefore, it is necessary to design a disposable safety syringe that is accurate in pin and the positioning of the needle holder, and the locking of the core rod and the syringe is tight, and it is completely self-destructing after use.
  • Mufa IjiJ The purpose of Mufa IjiJ is to provide a good positioning effect for the needle holder and the syringe, and the support for the injection of the needle seat is strong.
  • ⁇ ⁇ ⁇ '!:' the needle deer is pulled lightly, and the locking structure of the syringe and the core rod has a good locking effect.
  • a disposable safety syringe with a retractable needle tip can fundamentally eliminate the difficulty of assembling the needle hub and the syringe, pulling the core rod or pushing it back into the inner hole of the syringe.
  • a technical solution for achieving the object of the present invention is a needle tip retractable safety syringe comprising a syringe, a needle holder mounted in a mounting hole of a head of the barrel, and a core rod with a snap structure, the outer side of the needle holder
  • the upper side wall of the upper and the mounting hole of the syringe is provided with a stop boss structure, the needle barrel and the needle seat are positioned by the stop boss structure; the bottom of the needle seat is provided with a positioning for the needle seat, and the self-destruction of the stop a dam; the head of the core rod is engaged with the top end of the self-destructing dam.
  • the bottom of the needle seat is provided with a fixing groove for installing a self-destructing bar.
  • the body of the self-destructing dam is provided with an inner hole penetrating vertically, the head of the body penetrates the equal diameter sliding section of the lower part of the inner hole of the needle seat, and the top end of the body of the self-destructing dam is provided with a convex ring.
  • the convex ring can be engaged with the protrusion disposed at the bottom of the equal diameter sliding section of the needle seat, and the convex ring of the self-destructing bar and the protrusion of the needle seat are separated by a certain distance before self-destruction; the bottom of the body of the self-destructing bar is disposed There are at least two supporting legs, and each supporting leg protrudes from the needle seat and is connected to the card slot provided on the lower side wall of the mounting hole of the cylinder.
  • the inner hole of the self-destructing dam is divided into a small inner diameter oblique face segment, an inner diameter connecting hole segment and a large inner diameter inclined surface hole segment from top to bottom.
  • the support legs of the damper strip are evenly distributed with respect to the center of the body.
  • a bending groove is disposed at a joint of each supporting leg of the self-destructing dam and the body of the self-destructing dam.
  • the stop boss structure includes an upper boss disposed on the mounting hole of the barrel and a lower boss disposed on the outside of the hub.
  • the upper boss of the stop boss structure divides the mounting hole of the pin into a small aperture upper section and a large aperture lower section, and the card slot is disposed on the lower aperture section.
  • the lower boss of the stop boss structure divides the outer side of the needle seat into a small diameter upper section and a large diameter lower section, wherein the small diameter upper section and the small aperture upper section of the syringe are matched with S, the large diameter lower section and the large diameter of the syringe
  • the lower section is matched with 3 ⁇ 4.
  • the lower portion of the large diameter of the lower boss is provided with an annular groove, and a K"0" ring is arranged in the annular groove.
  • the inner hole of the barrel is provided with an engaging convex ring at the tail portion, and the upper side and the lower side of the engaging convex ring are disposed perpendicularly to the inner hole wall of the syringe; the outer diameter of the core rod is spaced apart from the outer diameter An annular upper flange and a lower flange that are larger than the inner diameter of the engaging collar of the barrel to match the aperture of the inner bore of the barrel, wherein the lower flange is pulled back to the tail of the inner bore of the barrel when the core rod is pulled back The engaging collar is deformed over, and the upper flange is engaged with the upper side of the engaging collar.
  • the body of the core rod is composed of a snap-connected upper body and a lower body, the upper flange is disposed on the upper body, and the flange is disposed on the lower body.
  • the outer side surface of the lower flange of the core rod is an oblique structure in which the iL1 is inclined upward and downward.
  • An outer edge of the lower end of the lower flange of the core rod is provided with a snap edge that is higher than the upper end surface.
  • the outer side surface of the upper flange of the core rod is a sloped structure which is obliquely outward from the top to the bottom.
  • the upper side of the engaging collar of the barrel and the arm of the inner side of the !3 ⁇ 4 have a rounded structure
  • the needle tip retractable safety ejector also includes a funnel-type assembly ring; the assembly ring mountain and the needle-connected body and
  • the bottom plate is composed, wherein the outer diameter of the main part is matched with the inner hole of the syringe in the lower part of the engaging convex ring of the syringe, and the upper part of the inner hole of the main part is an equal aperture section, and the inner diameter thereof is larger than the inner diameter of the engaging convex ring of the syringe.
  • the lower part of the inner hole of the part is a straight face chamfer with an increase in the diameter of the hole.
  • the tail end of the core body is tightly fitted with an 'injection pressing plate, wherein the outer end of the connecting portion of the body and the connecting plate is smaller than the upper portion of the inner hole of the mounting ring.
  • the present invention has the following beneficial effects: (1) When the invention is installed, the self-destructing strip is first mounted to the bottom of the needle seat, and then the self-destructing strip and needle are connected together.
  • the seat is placed from the rear of the barrel until the lower boss on the outside of the needle seat abuts the upper boss in the barrel mounting hole, and then the needle seat is rotated to make the support legs of the damper strip and the syringe
  • the card slots are in one-to-one correspondence, and each support leg is inserted into the corresponding card slot by hard extrusion to realize the installation and positioning of the needle seat.
  • the stop boss structure acts as a stop and a reference double S for the needle seat during the installation process, which can effectively avoid the occurrence of misplacement due to excessive force when the needle seat is mounted, and simplifies the assembly over 3 ⁇ 4, Increased assembly efficiency.
  • the head of the core rod with the engaging structure runs through the inner hole of the self-destructing dam from bottom to top, and is engaged with the top end of the body head of the beta damper strip, and the locking effect is good.
  • the present invention provides a special fixing groove on the needle seat to better mount the self-destructing dam.
  • the syringe is divided into 0.5 ml, 1 ml, 3 ml, 5 ml, 10 ml i: a variety of specifications, ⁇ 0. 5 ml and lml of the needle seat is relatively small, the needle is generally fixed on the needle seat, do not Replacement, so that the support leg of the self-destructing bar does not need to be engaged with the syringe slot to prevent the needle seat from rotating during use, so that the self-destruction bar can be directly loaded into the needle seat, which makes the processing of the needle seat easier.
  • the assembly of the needle seat and the syringe is more convenient; of course, the fixing groove can also be provided. At the same time, it is not limited to the 0. 5 ml and lml needle holders. This type of structure can be used for large-sized needles.
  • the inner hole of the self-destructing bar is divided into a small inner diameter oblique face segment, an inner diameter connecting hole segment and a large inner diameter oblique face segment.
  • each supporting leg when the self-destructing bar moves backward under the action of the core rod, the constraint of each supporting leg and the syringe is smoothly released, and the supporting legs and the body of the self-destructing bar of the present invention are
  • the connecting portion is provided with a bending groove, and the structural design can effectively improve the deformation of each supporting leg relative to the body;
  • the upper side surface and the lower side surface of the engaging convex ring of the syringe of the present invention are disposed perpendicularly to the inner hole wall of the syringe, and the outer diameters of the upper flange and the lower flange of the core rod are larger than the engagement of the syringe
  • the inner diameter of the convex ring, combined with the outer side surface of the upper flange of the core rod is a slanting structure which is inclined downward and outward, and the outer side of the lower flange is a sloped structure which is obliquely inward and downward in the mountain, so that the core rod When pulled back, the inverted tapered surface formed by the outer side of the lower flange can deform it beyond the engaging collar of the cylinder and smoothly reset and engage with the lower side of the engaging collar, and at the same time, the upper convex The front side formed by the outer side of the flange is not deformed, and the structure is stuck with the upper side of the engaging convex
  • the core rod cannot be pulled back or pushed up.
  • the structure design effectively solves the defect that the existing safety syringe core rod and the syringe are not self-destructive, and fundamentally eliminates The tip of the needle is exposed due to improper handling, ensuring the self-destruction effect, not only for the waste Bring convenience, but also can not be used by unscrupulous molecular S X.
  • the engaging convex ring of the syringe of the present invention is provided with a small rounded structure between the upper side surface and the inner side surface.
  • the outer side of the upper end surface of the lower flange of the wooden invention core rod has S having a higher engagement edge than the end surface, and the structural design can be effectively enhanced.
  • the present invention sets the core body to a two-part structure, namely, Shanka The upper body and the lower body are combined, and the upper flange is disposed on the upper body, and the lower flange is disposed on the lower body, so that the problem of demoulding of the processing jaw is well solved.
  • the locking mechanism of the core rod and the syringe can well destroy the lock of the core rod and the syringe, and the assembly also brings difficulties to the assembly of the core rod and the syringe. If the two are directly installed, when The core is inserted into the syringe, and the "two flanges of the core rod can be deformed over the engaging collar of the barrel, but the lower flange of the core rod is not deformed and is stuck with the lower side of the engaging collar of the barrel. In view of the above situation, the present invention designs a funnel-type assembly ring.
  • Figure 1 is a schematic plan view of the present invention
  • Figure 2 is a partially enlarged schematic view showing a portion A in Figure 1 of the present invention
  • Figure 3 is a cross-sectional view showing the planar structure of the syringe of the present invention.
  • Figure 4 is a cross-sectional view showing the planar structure of the hub of the present invention.
  • Figure 5 is a plan sectional view showing another structure of the needle holder of the present invention.
  • the pavilion 6 is a sectional view of the planar structure of the self-destructing strip of the present invention.
  • Figure 7 is a plan view of Figure 6 of the present invention.
  • Figure 8 is a schematic view showing the layout of three supporting legs of the self-destructing strip of the present invention.
  • FIG. 9 is a schematic view showing the layout of four supporting legs of the self-destructing strip of the present invention.
  • Figure 10 is a plan view showing the flat structure of the support leg of the self-destructing dam according to the present invention.
  • Figure 11 is a schematic view showing the structure of the core rod of the present invention.
  • Figure 12 is a schematic diagram of another structure of the core rod of the present invention:
  • Figure 13 is a schematic diagram of the cooperation of the syringe and the core rod of the present invention before self-destruction;
  • Figure 14 is a schematic view showing the cooperation of the self-destructive engagement of the syringe and the core rod of the present invention
  • Figure 15 is a partial enlarged view of a portion B of Figure 14 of the present invention.
  • Figure 16 is a schematic structural view of a split-type design of the core rod of the present invention.
  • Figure 17 is a schematic view showing the cooperation of the funnel-type assembly ring and the syringe of the present invention.
  • Syringe 1 mounting hole 11, upper boss 111, small aperture upper section 112, large aperture lower section 113, card slot 1131, snap collar 12, upper side 121, lower side 122, inner side 123, rounded structure 124 , inner hole 13, inner hole wall 131;
  • Needle holder 2 lower boss 21, small diameter upper section 22, large diameter lower section 23, annular groove 231, equal diameter sliding section 24, protrusion 25, fixing groove 26;
  • the core rod 3 the upper flange 31, the upper flange outer side surface 311, the lower flange 32, the lower A edge outer side surface 321, the engaging edge 322, according to the plate 33, the connecting portion 331;
  • Self-destructing bar 5 body 51, inner hole 511, small inner diameter oblique face segment 5111 ⁇ , equal inner diameter connecting hole segment 5112, large inner diameter oblique face segment 5113, convex ring 512, support leg 52, bending groove 53; Assembly ring 6, front portion 61, bottom plate 62, inner hole upper portion 63, inner hole lower portion 64.
  • the needle tip of the present embodiment can retract the safety syringe, including the syringe 1, the needle holder 2 mounted in the mounting hole 11 of the head of the barrel 1, and the core rod 3 with the engaging structure.
  • the upper outer side of the needle holder 2 and the upper side wall of the mounting hole 1, 1 of the syringe 1 are provided with a stop boss structure, and the needle barrel 1 and the needle holder 2 are positioned by the stop boss structure; the bottom of the needle holder 2 is provided with S
  • the groove 26 is fixed and a self-destructing dam 5 for positioning and stopping the needle hub 2 is mounted; the head of the core rod 3 is engaged with the top end of the self-destructing dam 5.
  • the stop boss structure includes an upper boss 111 provided on the mounting hole 11 of the barrel 1, and a lower boss 21 provided on the outer side of the hub 2.
  • the upper boss 111 of the stop boss structure divides the mounting hole 11 of the syringe 1 into a small aperture upper section 112 and a large aperture lower section 113, and the card slot 1131 is disposed on the large aperture lower section 113.
  • the lower boss 21 of the stop boss structure divides the outer side of the needle hub 2 into a small diameter upper section 22 and a large diameter lower section 23, wherein the small diameter upper section 22 is disposed in cooperation with the small aperture upper section 112 of the syringe 1, and the large diameter lower section 23 is
  • the large-diameter lower section 113 of the syringe 1 is fitted with S.
  • the large-diameter F-section 23 of the lower boss 21 is provided with an annular groove 231, and the annular groove 231 is provided with a "0"-type ring 4 for sealing.
  • the main body 51 of the self-destructing dam 5 is provided with an inner hole 511 penetrating up and down.
  • the head of the body 51 penetrates the equal diameter sliding section 24 at the lower part of the inner hole of the needle seat 2, and self-destructs at the same time.
  • the top end of the body 51 of the baffle 5 is provided with a convex ring 512 which is engageable with a protrusion 25 provided at the bottom of the equal diameter sliding section 24 of the hub 2, and the convex ring 512 and the needle of the self-destructing baffle 5
  • the protrusions 25 of the seat 2 are separated by a certain distance before self-destruction.
  • the bottom of the body 51 of the self-destructing bar 5 is provided with three supporting legs 52, and each supporting leg 52 protrudes from the needle seat 2 and corresponds to a card slot 1131 provided on the lower side wall of the mounting hole 11 of the syringe 1.
  • the snap-fit connection; each support leg 52 of the self-destructing bar 5 is radially evenly distributed with respect to the center of the wooden rest 51.
  • the connection between each support leg 52 of the self-destructing dam 5 and the body 51 of the self-destructing dam 5 is provided with a bending groove 53.
  • the support leg 52 is gathered from the bending groove 53 as shown in Fig. 10.
  • the inner hole 511 1' of the self-destructing bar 5 is divided into a small inner diameter oblique face segment 5111, an inner diameter connecting hole segment 5112 and a large inner diameter oblique face segment 5113 for ensuring that the head of the core rod 3 passes smoothly.
  • the inner hole 13 of the syringe 1 is provided with an engaging convex ring 12 at the tail portion, and the upper side 121 and the lower side surface 122 of the engaging convex ring 12 are disposed perpendicularly to the inner hole wall 131 of the syringe 1.
  • the upper side 121 of the engaging collar 12 of the cylinder 1 and the inner side surface 123 thereof are provided with a rounded structure 124.
  • the body of the core rod 3 is spaced apart from the annular upper flange 31 and the lower surface having an outer diameter larger than the inner diameter of the engaging collar 12 of the barrel 1 to match the inner diameter of the inner hole 13 of the barrel 1.
  • a flange 32 wherein the lower flange 32 is deformable beyond the engaging ⁇ " ring 12 when the core rod 3 is pulled back to the tail of the inner hole 13 of the barrel 1, and the upper flange 31 is engaged with the engaging collar 12 On the upper side and stuck to each other.
  • the upper flange 31 of the mounting core rod 3 can be deformed and smoothly passed over the engaging collar 12 of the barrel 1, and the lower flange outer side 321 of the lower flange 32 of the core rod 3 is obliquely inwardly from top to bottom.
  • FIG. 13 to FIG. 15 are schematic diagrams showing the structure of the syringe 1 and the core rod 3 before self-destruction and engagement.
  • the structure of this embodiment is basically the same as that of the embodiment i, except that: the bottom of the needle holder 2 has no fixing groove 26, and the structure is currently applicable to a syringe of 0.5 ml and 1 ml, which is also suitable for cooperation.
  • the structure of this embodiment is in the same manner as the first embodiment, except that: self-destruction bar 5 4 support feet 52.
  • the number of the support legs 52 is not limited, and may be evenly distributed in a radial manner with respect to the center of the body 51.
  • the structure of the embodiment is basically the same as that of the embodiment 1, except that: the body tk1 of the core rod 3 is engaged with the upper body 3' and the lower body 3", and the upper flange 31 is disposed on the upper body. 3 ' Upper and lower flanges 32 are set on the lower wooden body ' ⁇ '. This is because the protruding snap-to-mouth structure brings trouble to the release of the upper and lower flanges of the upper jaw. Therefore, the core body is arranged in a two-part structure, that is, by the snap fit.
  • the connecting cymbal body and the lower body are composed, and the upper flange is disposed on the upper body, and the lower flange is disposed on the lower body, so that the demolding problem of the processing boring is well solved.
  • the structure of the embodiment is substantially the same as that of the embodiment 1, except that: the embodiment further includes a funnel-type mounting ring 6; the mounting portion 6 is connected to the main body 61 of the syringe 1 and
  • the bottom plate 62 is composed, wherein the outer diameter of the wooden portion 61 is matched with the inner hole 13 of the syringe 1 at the lower portion of the engaging convex ring 12 of the syringe 1.
  • the upper portion 63 of the inner hole of the portion 61 is an equal aperture section, and the aperture and the syringe 1 are
  • the inner diameter of the engaging collar 12 is as large as the inner diameter of the lower portion 64 of the inner portion 61.

Description

针尖可回缩一次性安全注射器 技术领域
本发明涉及一次性安全注射器， 特别涉及一种针尖可回缩的一次性安全注射器。 背景技术
为避免给人类或动物输入或取出介质时发生交叉感染， 皮下注射器必须一次性使 用， 在使用后即作为垃圾处理。 目前使用最多的一次性注射器是由空腔针筒、 针头以及 装配在针筒内的定程活塞组成。 这种注射器所存在的最大问题是注射完毕之后， 其针头 仍留在外而， 不仅为注射器垃圾的搬运、 销毁处理带来不便， 同吋可能因不慎而扎伤医 护人员， 造成病菌的二次交叉感染， 成为一个不能忽视的医疗隐患， 因此出现了针头可 回缩的一次性安全注射器。 如中国专利文献 CN1803212公丌的《一种安全自毁医用注射 器》， 其针尖的回缩是通过芯杆手动后拉针^实现的， 注射器的针座和针筒的定位是通 过针座外侧的环形凸台及针筒上的环形卡槽实现连接； 而为避免用力过 把芯杆从针筒 中拉出导致针头外露， 同时也为了避免芯杆回推使针头刺穿针筒而外露， 芯杆上的卡圈 与设' 在针筒底部的环形卡位圈的弹性凸卡爪对应相卡合， 使芯杆头部锁.死在针筒的底, 部。 ½结构设计存在很大的缺陷， 一方面过盈配合的连接方式使针座在针筒中不容易定 位， 装配困难， 很容易会因用力过猛而使环形凸台脱出环形卡槽导致装配失败； 而在注 射过程中， 针座的注射支撑力不强且不稳定， 容易发生转动， 给患者带来很大的不适； 此外， 注射完后手动后拉针座要克服环形凸台与环形卡槽的卡合连接， 阻力非常大， 后 拉费力且很不好操作。 再者， 由于弹性凸卡爪是易变形结构， 导致该锁定效果很不好， 一旦芯杆拉力或推力超过一定程度， 芯杆照样能被拉出或被重新推入针筒， 从而导致针 尖外^， 即注射器自毁失败， 不仅给废弃物处理带来安全隐患， 同吋也很容易被不法分 子重复使用。 因此， 需要设计一种针简与针座定位准确、 芯杆与针筒的卡锁紧密， 真 做到使用后彻底自毁的一次性安全注射器。
木发 IjiJ的目的是提供一种针座与针筒定位效果好、 针座注射支撑力强 Γίΐί稳 '!：'、 针鹿 后拉轻便、 针筒和芯杆的卡锁结构锁定效果好的针尖可回缩的一次性安全注射器， 能从 根本上杜绝针座与针筒装配困难、 芯杆被拉出或被重新推入针筒内孔的问题。 实现本发明目的的技术方案是一种针尖可回缩安全注射器， 包括针筒、 安装在针筒 的头部的安装孔内的针座和带卡合结构的芯杆， 所述针座的外侧上部与针筒的安装孔的 上侧壁设置有止位凸台结构， 针筒与针座通过止位凸台结构定位； 针座底部安装有一用 于针座的定位.和止动的自毁挡条； 芯杆的头部与自毁挡条的顶 '端卡合。
所述针座底部设置有安装自毁挡条的固定槽。
所述自毁挡条的本体内设置有上下贯通的内孔， 本体的头部深入针座的内孔下部的 等直径滑动段， 同时自毁挡条的本体的头部顶端设置有凸环， 凸环可与设置在针座的等 直径滑动段底部的突起卡合， 自毁挡条的凸环和针座的突起在自毁前相隔一定的距离； 所述自毁挡条的本体底部设置有至少两个支撑脚， 各支撑脚伸出针座并与设置在针筒的 安装孔的下侧壁上的的卡槽一一对应卡^连接。
所述自毁挡条的内孔自上而下分为小内径斜面孔段、等内径连接孔段和大内径斜面 孔段。
所述 毁挡条的各支撑脚相对本体中心. ¾镉射状均匀分布。
所述自毁挡条的各支撑脚与自毁挡条的本体的连接处设置有折弯槽。
所述止位凸台结构包括设置在针筒的安装孔上的上凸台和设 S在针座的外侧的下 凸台。
所述止位凸台结构的上凸台把针简的安装孔分成小孔径上段和大孔径下段， 所述卡 槽设 S在大孔径下段上。 '
所述止位凸台结构的下凸台把针座的外侧分为小直径上段和大直径下段，其中小直 径上段与针筒的小孔径上段配合设 S， 大直径下段与针筒的大孔径下段配合设 ¾。
所述下凸台的大直径下段上设 S有环形槽， 环形槽中设 K " 0 "型圈。
所述针筒的内孔在尾部设置有一卡合凸环， 卡合凸环的上侧而、 下侧面均与针筒的 内孔壁垂直设置； 所述芯杆的本体上间隔设置有外径大于针筒的卡合凸环的内径而与针 筒的内孔的孔径相配合的环形的上凸缘和下凸缘，其中下凸缘在芯杆后拉到达针筒的内 孔的尾部时可变形越过所述卡合凸环， 而上凸缘则与卡合凸环的上侧面相互卡死。
所述芯杆的本体由卡合连接的上本体和下本体组成， 所述上凸缘设置在上本体上， 所述 凸缘设置在下本体上。
所述芯杆的下凸缘的外侧面为一 iLl上而下斜向内的斜而结构。
所述芯杆的下凸缘的上端面外侧设覽有高于上端面的卡合沿口。
所述芯杆的上凸缘的外侧面为一由上而下斜向外的斜面结构。
所述针筒的卡合凸环的上侧面与 !¾内侧面之 设臂有- -倒圆角结构
针尖可回缩安全 射器还包括一漏斗式的装配圈； 装配圈山与针^迮接的本部及 底板组成， 其中本部的外径与针筒的卡合凸环下部的针筒的内孔配合， 本部的内孔上段 为等孔径段， 其孔径与针筒的卡合凸环的内径等大， 本部的内孔下段为孔径逐歩增大的 直面大倒角。
所述芯杆本体尾部紧配合设 '置一注射用按板， 其中本体尾部用与连接按板的连接 部外径小于装配圈的等孔径的内孔上段。
采用了以上的技术方案后， 本发明具有一下的有益的效果： （1 ) 本发明在安装时， 首先把自毁挡条安装到针座底部， 接着把连为一体的自毁挡条和针座从针筒后部放入， 直到针座外侧的下凸台与针筒安装孔内的上凸台相抵止位， 而后转动针座， 使向毁挡条 的各个支撑脚与针筒上的卡槽一一对应， 并通过硬挤压的方式使各个支撑脚进入相应的 卡槽中， 实现针座的安装定位。在此， 止位凸台结构在安装过程中对针座起到止位和基 准的双 S作用， 可有效避免安装针座时因用力过猛导致错位安装现象的发生， 简化了装 配过 ¾， 提升了装配效率。 带卡合结构的芯杆头部从下而上贯穿自毁挡条的内孔 lit]与 β 毁挡条的本体头部顶端实现卡合， 锁定效果好。
( 2 ) 针座在安装完成后， 其定位 ώ止位凸台结构结合自毁挡条实现， 整个针筒和 针座的连接紧凑无间隙， 定位非常稳定。 在注射过程中， 来自于针座的作用力均衡地作 用在 Α毁挡条的各个支撐脚上， 自毁挡条的本体不直接受力， 自毁挡条在此过程中无位 移也无变形， 可为针座提供强而稳定的支撑力， 同时旋转针座， 自毁挡条的多个支撑脚 和针筒卡槽一一对应相卡合， 这样的结构其从根本上杜绝了针座在注射过程巾发生转 动， 减少了患者的额外伤痛。
( 3 )本发明在针座上设置专门的固定槽， 能更好地安装自毁挡条。 在实际生产中， 注射器分为 0. 5 ml , 1ml、 3ml、 5ml、 10ml i:种规格， ώ于 0. 5 ml 和 lml的针座比较 细小， 针头一般是固定在针座上的， 不用更换， 从而不需要自毁挡条的支撑脚与针筒卡 槽卡合来防止针座在使用过程中发生旋转， 因此可以直接将自毁挡条装入针座， 使针座 的加工更加简单， 针座和针筒的装配更加方便； 当然也可以均设置固定槽。 同吋， 也不 仅仅限定于 0. 5 ml 和 lml的针座釆用这种结构， 大规格的针简如果头部结构细小， 也 可以采甩这样的针座结构。
(4 ) 为保证芯杆头部顺利穿过自毁挡条内孔， 自毁挡条内孔 |ί|上而下分为小内径 斜面孔段、 等内径连接孔段和大内径斜面孔段。 当后拉芯杆， 因此吋自毁挡条本体直接 受力， 而各支撑脚不直接受力， 自毁挡条的本体就会随芯杆同歩下移， 而各支撑脚相对 木休收拢而 ¾各 的针简上的卡槽脱离， 以此来解除针座底部的定位约朿。 在此， i? 毁»条的凸环和针座的突起之间在自毁前相隔一定的距离， 这使得自毁挡条的本体在芯 杆带动下同步下移开始时， 仅自毁挡条的本体相对针座的内孔的等直径滑动段下滑， 且 各支撑脚相对本体收拢而与各自的针筒卡槽脱离， 而针座保持不动， 该过程一直到自毁 挡条的凸环与针座的等直径滑动段的底部的突起卡合， 此时自毁挡条的各支撑脚与针筒 的卡槽的卡合已经完全解除， 即针座后移的约束已不存在， 针座可很轻便地随自毁挡条 和芯杆一起后移， 带动针头完全进入针筒而实现自毁。
( 5 ) 为使自毁挡条在芯杆作用下后移时增强各个支撑脚的收拢效果， 保 各支撑 脚与针筒的约束顺利解除， 本发明自毁挡条的各支撑脚与本体的连接处设置有折弯槽， 该结构设计可有效提升各支撑脚相对本体的变形; ：。
( 6 ) 本发明的针筒的卡合凸环的上侧面、 下侧面均与针筒的内孔壁垂直设賈， 芯 杆的上凸缘和下凸缘的外径大于针筒的卡合凸环的内径， 并结合芯杆的上凸缘外侧面为 一 ώ t.而下斜向外的斜面结构， 下凸缘外侧而为一山上而下斜向内的斜而结构， 使得芯 杆后拉时， 下凸缘外侧面形成的倒锥形面结构能使其变形越过针筒的卡合凸环并顺利复 位与卡合凸环的下侧面卡死， 而与此同吋， 上凸缘外侧面形成的正锥形而结构则无法变 形， 其与卡合凸环的上侧面卡死， 即卡合凸环被上、下凸缘完全卡死， 在不破坏上凸缘、 下凸缘及卡合凸环自身结构的情况下， 芯杆无法后拉也无法上推， 该结构设计有效解决 了现有安全注射器芯杆和针筒卡合自毁不牢固的缺陷， 从根本上杜绝了因处理不当导致 的针尖外露现象， 确保了自毁效果， 不仅给废弃物处理带来方便， 同时也无法被不法分 子 S X使用。
( 7 ) 为保证芯杆后拉吋下凸缘能够顺利越过针筒的卡合凸环， 本发明针筒的卡合 凸环在其上侧面与内侧面之间设置有一小倒圆角结构。 同时为增强下凸缘的变形性能， 木发明芯杆的下凸缘的上端面外侧设 S有高于端面的卡合沿口， 该结构设计可有效增强
F凸缘的内缩能力。 另外， 突出的卡合沿口结构给加工时上凸缘和下凸缘之间的脱模带 来了困难， 针对这种情况， 本发明把芯杆本体设 S成两部分结构， 即山卡合连接的上本 体和下本体组成， 且上凸缘设置在上本体上， 下凸缘设 S在下本体上， 使得加工吋的脱 模问题得到了很好的解决。
8 ) 前述芯杆与针筒的卡锁机构能够很好的实现芯杆和针筒的 毁锁死， 同吋 也给芯杆和针筒的装配带来困难， 若两者直接进行安装， 当芯朴插入针筒吋， 芯杆的」二 凸缘可变形越过针筒的卡合凸环， 但芯杆的下凸缘不会变形而和针筒的卡合凸环的下侧 而卡死， 针对这种情况， 本发明设计了漏斗式的装配圈， 在安装时， 首先把装配圈的本 部插入针筒尾部， 而后把芯杆从装配圈的本部的内孔下段的直而火倒角屮挤入， 使芯杆 的上凸缘和下凸缘同时变形而进入装配圈的本部的等直径的内孔上段， 进而进入针简的 卡合凸环内孔， 并最终顺利进入针筒内部实现安装， 此时， 卸下设置在芯杆本体尾部的 按板， 就可把装配圈拿出实现重复利用， 而后把按板安回去就完成了整个装配过程。 附图说明
为了使本发明的内容更容易被清楚地理解， 下面根据具体实施例并结合附图， 对本 发明作进一步详细的说明， 其中
图 1为本发明的平面结构示意图；
图 2为本发明图 1中 A处的局部放大示意图；
图 3为本发明针筒的平面结构剖视图；
图 4为本发明针座的平面结构剖视图；
图 5为本发明针座的另一种结构的平面结构剖视图；
阁 6为本发明自毁挡条的平面结构剖视图；.
图 7为本发明图 6的俯视图；
图 8为本发明自毁挡条带三个支撑脚的布局示意图；
图 9为本发明自毁挡条带四个支撑脚的布局示意图；
图 10为本发明自毁挡条的支撑脚收拢吋的平而结构示意图；
图 11本发明芯杆的一种结构示意图；
图 12为本发明芯杆的另一种结构示意阁：
图 13本发明针筒和芯杆自毁前的配合示意阁；
图 14本发明针筒和芯杆自毁卡合的配合示意图；
图 15本发明图 14中 B处的局部放大图；
图 16本发明芯杆分体式设计的结构示意图；
图 17本发明漏斗式装配圈与针筒的配合示意图。
附图中的标号为：
针筒 1, 安装孔 11, 上凸台 111， 小孔径上段 112， 大孔径下段 113， 卡槽 1131， 卡合凸环 12， 上侧面 121， 下侧面 122， 内侧面 123， 倒圆角结构 124， 内孔 13， 内孔 壁 131;
针座 2， 下凸台 21， 小直径上段 22, 大直径下段 23， 环形槽 231, 等直径滑动段 24， 突起 25， 固定槽 26;
芯杆 3， 上凸缘 31， 上凸缘外侧面 311， 下凸缘 32， 下 A缘外侧面 321， 卡合沿口 322， 按板 33， 连接部 331; '
"0"型圈 ；
自毁挡条 5， 本体 51， 内孔 511， 小内径斜面孔段 5111·， 等内径连接孔段 5112， 大内径斜面孔段 5113, 凸环 512， 支撑脚 52， 折弯槽 53; 装配圈 6， 本部 61， 底板 62， 内孔上段 63， 内孔下段 64。
具体实施方式
(实施例 1)
见图 1和图 2， 本实施例的针尖可回缩安全注射器， 包括针筒 1、 安装在针筒 1的 头部的安装孔 11内的针座 2和带卡合结构的芯杆 3。针座 2的外侧上部与针筒 1的安装 孔 1,1 的上侧壁设置有止位凸台结构， 针筒 1 与针座 2通过止位凸台结构定位； 针座 2 底部设 S有一固定槽 26, 并安装有一用于针座 2的定位和止动的自毁挡条 5; 芯杆 3的 头部与自毁挡条 5的顶端卡合。
见图 1至图 4，止位凸台结构包括设置在针筒 1的安装孔 11上的上凸台 111和设置 在针座 2的外侧的下凸台 21。 止位凸台结构的上凸台 111把针筒 1的安装孔 11分成小 孔径上段 112和大孔径下段 113,卡槽 1131设 S在大孔径下段 113上。止位凸台结构的 下凸台 21把针座 2的外侧分为小直径上段 22和大直径下段 23， 其中小直径上段 22与 针筒 1的小孔径上段 112配合设置， 大直径下段 23与针筒 1的大孔径下段 113配合设 S。 下凸台 21的大直径 F段 23上设 S有环形槽 231， 环形槽 231中设覽密封用的 "0" 型圈 4。 . 见图 6至图 8， 自毁挡条 5的本体 51内设覽有上下贯通的内孔 511, 本体 51的头 部深入针座 2的内孔下部的等直径滑动段 24, 同时自毁挡条 5的本体 51的头部顶端设 置有凸环 512, 凸环 512可与设置在针座 2的等直径滑动段 24底部的突起 25卡合， 自 毁挡条 5的凸环 512和针座 2的突起 25在自毁前相隔一定的距离。 自毁挡条 5的本体 51底部设置有三个支撑脚 52， 各支撑脚 52伸出针座 2并与设 ¾在针筒 1的安装孔 11 的下侧壁上的的卡槽 1131——对应卡合连接； 自毁挡条 5的各支撑脚 52相对木休 51 中心呈辐射状均匀分布。 自毁挡条 5的各支撑脚 52与自毁挡条 5的本体 51的连接处设 梵有折弯槽 53, 支撑脚 52从折弯槽 53处收拢的情形如图 10所示。 自毁挡条 5的内孔 511 1'Ί上而下分为小内径斜面孔段 5111、等内径连接孔段 5112和大内径斜面孔段 5113， 用于保证芯杆 3的头部顺利穿过自毁挡条 5的内 511ο
见图 3，针筒 1的内孔 13在尾部设置有一卡合凸环 12，卡合凸环 12的上侧而 121、 下侧面 122均与针筒 1的内孔壁 131垂直设¾。 针筒 1的卡合凸环 12的上侧面 121与 其内侧面 123之间设 S有一倒圆角结构 124。 见图 11, 芯杆 3的本体上间隔设 Η有外径 大于针筒 1的卡合凸环 12的内径而与针筒 1的内孔 13的孔径相配合的环形的上凸缘 31 和下凸缘 32,其中下凸缘 32在芯杆 3后拉到达针筒 1的内孔 13的尾部时可变形越过卡 合 ι"ι环 12， 而上凸缘 31 则与卡合凸环 12的上侧而相互卡死。 为保' ul;芯杆 3和针筒 1 安装吋芯杆 3的上凸缘 31能够变形并顺利越过针筒 1的卡合凸环 12， 芯杆 3的下凸缘 32的下凸缘外侧面 321为一由上而下斜向内的斜面结构；同时为保证自毁时芯杆 3的下 凸缘 32能够变形并顺利越过针筒 1的卡合凸环 12，芯杆 3的上凸缘 31的上凸緣外侧面 311为一 上而下斜向外的斜面结构。芯杆 3的下凸缘 32的上端面外侧设置有高于上端 面的卡合沿口 322。 针筒 1与芯杆 3自毁前及卡合的结构示意图如图 13至图 15。
(实施例 2 )
见图 5， 本实施例的结构与实施例 i基本相同， 不同之处在于： 针座 2的底部没有 固定槽 26， 这种结构目前适用于 0. 5 ml 、 1ml的注射器， 也适用于配合头部结构细小 的大规格的针使用的针座结构。
(实施例 3 )
见图 9， 本实施例的结构与实施例 1 s本相 in] , 不同之处在于： 自毁挡条 5
Figure imgf000009_0001
4 个支撑脚 52。支撑脚 52的个数并不受限定，可以相对本体 51中心呈辐射状均匀分布任 意多个。
(实施例 4 )
见图 16， 本实施例的结构与实施例 1基本相同， 不同之处在于： 芯杆 3的本体 tkl卡 合连接的上本体 3 ' 和下本体 3 " 组成，上凸缘 31设置在上本体 3 ' 上， 下凸缘 32设 S 下木体 'λ "上。 这是 ώ于突出的卡合沿口结构给加工吋上凸缘和下凸缘之问的脱模带 来了闲难， 因此釆用将芯杆本体设置成两部分的结构， 即由卡合连接的匕本体和下本体 组成， 且上凸缘设置在上本体上， 下凸缘设置在下本体上， 使得加工吋的脱模问题得到 了很好的解决。
(实施例 5 )
见图 12和图 17， 本实施例的结构与实施例 1基本相同， 不同之处在于： 本实施例 还包括一漏斗式的装配圈 6; 装配圈 6山与针筒 1连接的本部 61及底板 62组成， 其中 木部 61的外径与针筒 1的卡合凸环 12下部的针筒 1的内孔 13配合， 本部 61的内孔上 段 63为等孔径段， 其孔径与针筒 1的卡合凸环 12的内径等大， 本部 61的内孔下段 64 为孔径逐歩增.大的直面大倒角。 为配合装配圈 6的使用， 芯杆 3的本体尾部紧配合设 ¾ - 射用的按板 33， 其屮本体尾部用于连接按板 33的连接部 331的外径小于装 6 的等孔径的内孔上段 63。 以上所述的具体实施例， 对本发明的目的、 技术方案和有益效果进行了进一歩详细 说明， 所应理解的是， 以上所述仅为本发明的具休实施例而已， 并不用于限制本发明， 凡在本发明的精神和原则之内， 所做的任何修改、 等同替换、 改进等， 均应包含在本发 明的保护范围之内。

Claims

1、 一种针尖可回缩安全注射器， 包括针筒 （1)、 安装在针筒 （1) 的头部的安装孔 (11) 内的针座 （2) 和带卡合结构的芯杆 （3), 其特征在于： 所述针座 （2) 的外侧上 部与针筒 (1) 的安装孔 (11) 的上侧壁设置有止位凸台结构， 针筒 (1) 与针座 (2) 通过止位凸台结构定位； 针座 （2)底部安装有一用于针座 （2) 的定位和止动的自毁挡 条 （5); 芯杆 （3) 的头部与自毁挡条 （5) 的顶端卡合。
2、 根据权利要求 1针尖可回缩安全注射器， 其特征在于： 所述针座 （2) 底部设置 有安装自毁挡条 （5) 的固定槽 （权26)。
3、 根据权利要求 1或 2针尖可回缩安全注射器， 其特征在于： 所述自毁挡条 （5) 的本体 (51) 内设置有上下贯通的内孔 (511), 本体 (51) 的头部深入针座 (2) 的内 孔下部的等直径滑动段 (24), 同时自毁挡条 (5) 的本体 (51) 的头部顶端设置有凸环
(512)， 凸环 （512) 可与设置在针座 （2) 的等直书径滑动段 （24) 底部的突起 （25) 卡 合， 自毁挡条 (5) 的凸环 (512) 和针座 (2) 的突起 (25) 在自毁前相隔一定的距离； 所述陶毁挡条 （5) 的本体 （51) 底部设 S有至少 个支撑脚 （52)， 各支撑脚 （52) 伸 出针座 （2) 并与设置在针筒 （1) 的安装孔 （11) 的下侧壁上的的卡槽 （1131) —一对 应卡合连接。 . '
4、根据权利要求 3所述的针尖可回缩安全注射器， 其特征在于： 所述 毁挡条（5) 的内孔 〔511) 自上而下分为小内径斜面孔段 （5111)、 等内径连接孔段 （5112) 和大内 径斜面孔段 （5113)。
5、根据权利要求 4所述的针尖可回缩安全注射器， 其特征在于： 所述自毁挡条（5) 的各支撑脚 （52) 相对本体 （51) 中心呈辐射状均匀分布。
6、根据权利要求 5所述的针尖可回缩安全注射器， 其特征在于： 所述自毁挡条（5) 的各支撑脚 （52) 与自毁挡条 （5) 的本体 （51) 的连接处设置有折弯槽 （53)。
7、 根据权利要求 1或 2所述的针尖可回缩安全注射器， 其特征在于： 所述 iL:位凸 台结构包括设置在针筒 （1) 的安装孔 （11) 上的上凸台 （ili) 和设置在针座 （2) 的 外侧的下凸台 （21)。
8、 根据权利要求 7所述的针尖可回缩安全注射器， 其特征在于： 所述止位凸台结 构的上凸台 （1U) 把针筒 （1) 的安装孔 （ii) 分成小孔径上段 （112) 和大孔径下段
(113)， 所述卡槽 （1131) 设置在大孔径下段 （113) 上。
9、 根据权利要求 8所述的针尖可回缩安全注射器， 其特征在于： 所述止位凸台结 构的下凸台 (21) 把针座 (2) 的外侧分为小 ：径上段 (22) 和大直径下段 (23), 其中 小直径上段 （22) 与针筒 （1) 的小孔径上段 （112) 配合设置， 大直径下段 （23) 与针 筒 (1) 的大孔径下段 (113) 配合设置。
10、根据权利要求 9所述的针尖可回缩安全注射器， 其特征在于： 所述下凸台（21) 的大直径下段 （23) 上设置有环形槽 （231)， 环形槽 （231) 中设置 "0" 型圈 （4)。
1K 根据权利要求 1或 2所述的针尖可回缩安全注射器， 其特征在于： 所述针筒 (1) 的内孔 （13) 在尾部设置有一卡合凸环 （12)， 卡合凸环 （12) 的上侧面 （121)、 下侧面 （122) 均与针筒 （1) 的内孔壁 （131) 垂直设置;' 所述芯杆 （3) 的本体上问隔 设置有外径大于针筒 （1) 的卡合凸环 （12) 的内径而与针筒 （1) 的内孔 （13) 的孔径 相配合的环形的上凸缘 (31) 和下凸缘 （32)， 其中下凸缘 (32) 在芯杆 (3) 后拉到达 针简 （1) 的内孔 （13) 的尾部时可变形越过所述卡合凸环 （12)， 而上凸缘 （31) 则与 卡合凸环 （12) 的上侧面相互卡死。
12、 根据权利要求 11所述的针尖可回缩安全注射器， 其特征在于： 所述芯杆：（3) 的本体山卡合连接的上本体 (3' ) 和下本体 (3" ) 组成， 所述上凸缘 (31) 设 K在上 本体 (3' ) 上， 所述下凸缘 (32) 设 K在下本体 C3" ) 上。
13、 根据权利要求 12所述的针尖可回缩安全注射器， 其特征在于： 所述芯杆 （3) 的下凸缘 （32) 的下凸缘外侧面 （321) 为- ·ώ上而下斜向内的斜而结构。
Μ、 根据权利要求 13所述的针尖可回缩安全注射器， 其特征在于： 所述芯杆 (3) 的下凸缘 （32) 的上端面外侧设置有高于上端面的卡合沿口'（322)。 '
15、 根据权利要求 12所述的针尖可回缩安全注射器， 其特征在于： 所述芯杆 （3) 的上凸缘 （.31) 的上凸缘外侧面 （311) 为一由上而下斜向外的斜面结构。
16、 根据权利要求 15所述的针尖可回缩安全注射器， 其特征在于： 所述针筒 （1) 的卡合凸环（12)的上侧面（121)与其内侧面（123)之间设 S有一倒圆角结构（12 。
17、 根据权利要求 12至 14之一所述的针尖 πί回缩安全注射器， 其特征在于： 还包 括—-漏斗式的装配圈 （6); 装配圈 （6) |:L- 1与针筒 （1) 连接的本部 〔61) 及底板 （62) 组成， 其中本部（61)的外径与针筒（1)的卡合凸环（12)下部的针筒（1)的内孔（13) 配合， 本部 （61) 的内孔上段 （63) 为等孔径段， 其孔径与针筒 （1) 的卡合凸环 （12) 的内径等大， 本部 （61) 的内孔下段 （64) 为孔径逐歩增大的直面大倒角。
18、 根据权利要求 Π所述的针尖可回缩安全注射器， 其特征在于： 所述芯杆 （3) 的本体尾部紧配合设置一注射用的按板 （33)， 其中本体尾部用于连接按板 （33) 的连 接部 （331) 的外径小于装配圈 （6) 的等孔径的内孔上段 （63)。
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