CN111012975A - Resilience type injector with shielding needle eccentric baffle - Google Patents
Resilience type injector with shielding needle eccentric baffle Download PDFInfo
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- CN111012975A CN111012975A CN202010071612.5A CN202010071612A CN111012975A CN 111012975 A CN111012975 A CN 111012975A CN 202010071612 A CN202010071612 A CN 202010071612A CN 111012975 A CN111012975 A CN 111012975A
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- needle
- eccentric
- core rod
- protective cover
- small
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- 230000001681 protective effect Effects 0.000 claims abstract description 39
- 230000003139 buffering effect Effects 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 230000000903 blocking effect Effects 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 244000208734 Pisonia aculeata Species 0.000 description 4
- 230000036544 posture Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
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
-
- 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
-
- 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
- A61M5/178—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
- A61M2005/3224—Means to disalign the needle tip and 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
- A61M2005/3231—Proximal end of needle captured or embedded inside piston head, e.g. by friction or hooks
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hematology (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Environmental & Geological Engineering (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
A resilient syringe with an eccentric shield for a shield needle, comprising: a protective cover having a needle through hole therein; the front end of the large needle base is connected with the protective cover, and the front part in the large needle base is provided with an elastic buckling body; the eccentric separation blade is arranged in the protective cover and is provided with an eccentric hole and a blind hole; the front end of the needle cylinder is connected with the large needle seat, and the inner wall of the front end is provided with an annular barb; the buffer bracket is arranged at the rear part in the large needle base; the front part of the small needle seat is in snap fit with the elastic buckling body of the large needle seat, and the outer wall of the rear part of the small needle seat is provided with an annular boss; the needle tip of the needle tube is exposed after penetrating through the eccentric hole of the eccentric baffle and the needle through hole of the protective cover, and the rear end of the needle tube is fixed in the small needle seat; the two ends of the spring are respectively abutted against the inner side of the buffer bracket and the annular boss of the small needle seat; a core bar; the core rod head is connected with the front end of the core rod, and the front end surface of the core rod head is matched with the rear end surface of the buffer support; the piston is sleeved on the core rod head; the buffering rubber plug is arranged in the front end of the core rod head. Compact structure, self-destruction convenient operation has improved the security.
Description
Technical Field
The invention belongs to the technical field of injectors, and particularly relates to a rebound injector with a shielding needle eccentric baffle.
Background
The conventional rebound syringe drives the needle tube to retract into the sleeve through the needle tube retracting mechanism to realize self-destruction, but the needle point of the retracted needle tube has the possibility of extending out of the sleeve again, so that potential safety hazards exist. Meanwhile, a needle tube retraction mechanism which is easier to self-destruct needs to be designed so as to improve the convenience and reliability of the use of the rebound syringe product.
Disclosure of Invention
The invention aims at the problems and provides a rebound type injector with a shielding needle eccentric baffle.
The purpose of the invention can be realized by the following technical scheme: a resilient syringe with an eccentric shield for a shield needle, comprising:
a protective cover, in which a needle through hole is formed;
the front end of the large needle base is connected with the rear end of the protective cover, the front part in the large needle base is provided with an elastic buckling body, and the inner wall of the elastic buckling body is provided with an annular buckle;
the eccentric blocking pieces are arranged in the protective cover, are arranged along the radial surface, are axially limited by the internal structure of the protective cover and the front end surface of the large needle base, are more than 1 piece, are provided with eccentric holes, are provided with a plurality of blind holes arranged on the peripheral side of the eccentric holes along the circumferential direction on the rear end surface, and are provided with more than 2 fulcrums on the outer contour;
the front end of the needle cylinder is connected with the rear end of the large needle seat, and the inner wall of the front end of the needle cylinder is provided with an annular barb which extends into the rear end of the large needle seat;
the buffer bracket is arranged at the rear part in the large needle base;
the front part of the small needle seat is arranged in the elastic buckle body of the large needle seat, the outer wall of the front part of the small needle seat is provided with an annular clamping groove matched with the annular buckle of the large needle seat, the rear part of the small needle seat is arranged in the buffer bracket, and the outer wall of the rear part of the small needle seat is provided with an annular boss;
the needle tip at the front end of the needle tube passes through the eccentric hole of the eccentric retaining sheet and the needle through hole of the protective cover and then is exposed, and the rear end of the needle tube is fixed on the small needle base;
the spring is arranged in the buffer bracket and sleeved at the rear part of the small needle seat, and two ends of the spring respectively abut against the inner side of the front end face of the buffer bracket and the annular boss of the small needle seat and are in a compressed state;
the core rod is arranged in the injection syringe body and is a hollow rod body with an opening at the front;
the front end of the core rod head extends into the rear end of the large needle seat, the front end surface of the core rod head is matched with the rear end surface of the buffer bracket, and the rear part of the core rod head is connected with the front end of the core rod;
the piston is sleeved at the front part of the core rod head; and
the buffering rubber plug is clamped and arranged in the front end of the core rod head;
when the needle tube is self-destructed, the core rod is pushed, the core rod head pushes the buffer support forwards, the front end of the buffer support is pushed into the rear end of the elastic buckling body of the large needle base, the elastic buckling body is expanded and deformed, the annular buckle on the inner wall of the elastic buckling body of the large needle base is separated from the annular clamping groove of the small needle base, the elastic force released by the compressed spring enables the small needle base, the needle tube and the buffer rubber plug to rebound backwards into the core rod, after the needle point of the needle tube retreats out of the eccentric hole of the eccentric block piece, the eccentric block piece without the support of the needle tube freely moves along the radial surface in the protective cover until reaching a balanced state, the eccentric block piece in the balanced state is in contact with the inner wall of the protective cover through the fulcrum on the outline to keep balance, the solid surface of the eccentric block piece.
Furthermore, the elastic buckle body of the protective cover is in a hollow conical shape with a large front part and a small back part, and the front end of the elastic buckle body is connected with the front end surface of the large needle base.
Furthermore, the inner edge of the rear end face of the elastic buckling body of the protective cover is provided with a first inner conical surface, and the outer edge of the front end face of the buffering support is provided with a first outer conical surface matched with the first inner conical surface.
Further, the outer wall of the rear portion of the buffering support is provided with a sealing ring mounting groove, and a sealing ring is mounted in the sealing ring mounting groove.
Furthermore, a needle fixing hole and a liquid inlet hole which are communicated back and forth along the axis are arranged in the small needle base.
Furthermore, a second inner conical surface is arranged on the inner edge of the rear end surface of the small needle seat, and a second outer conical surface matched with the second inner conical surface is arranged on the outer edge of the front end surface of the buffering rubber plug.
Furthermore, the inner wall of the front end of the core rod head is provided with a clamping bulge protruding along the circumferential direction, and the clamping bulge clamps the buffer rubber plug.
Furthermore, the edge of the eccentric hole of the eccentric baffle is provided with a fillet.
Compared with the prior art, the invention has the beneficial effects that: the eccentric blocking piece is arranged in the protective cover, and when the needle tip of the needle tube exits from the eccentric hole of the eccentric blocking piece, the eccentric blocking piece blocks the needle through hole of the protective cover, so that the needle tube which can still axially move is effectively prevented from passing through the eccentric blocking piece forwards. The structure of the large needle base, the small needle base, the buffer support and the spring is adopted, the interlocked large needle base and the small needle base are unlocked by pushing the buffer support forwards, and the small needle base, the needle tube and the buffer rubber plug are rebounded backwards into the core rod by the elastic force released by the compressed spring. The whole structure is compact, the self-destruction operation is simple, and the convenience and the safety of the product are improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the injection device in a ready-to-use or filled state.
Fig. 2 is a schematic structural view of an eccentric baffle in an embodiment.
FIG. 3 is a cross-sectional view of an eccentric baffle in one embodiment.
Fig. 4 is a schematic view of a single eccentric flap in a balanced state according to an embodiment.
Fig. 5 is another schematic view of the single eccentric flap in a balanced state according to an embodiment.
FIG. 6 is a schematic diagram of an embodiment of the injection solution feeding to the bottom.
FIG. 7 is a schematic structural diagram of an embodiment in a self-destruction state.
Fig. 8 is a schematic view of an embodiment of a 3-piece eccentric block in a balanced state.
Fig. 9 is another schematic view of the 3 eccentric baffles in the balanced state in one embodiment.
The parts in the figures are numbered as follows:
1 protective cover
101 needle through hole
2 big needle stand
201 elastic buckle body
202 annular buckle
3 eccentric block sheet
301 eccentric hole
302 blind hole
303 fulcrum a
304 fulcrum b
305 fulcrum c
4 syringe
401 annular barb
5 buffer support
501 first external conical surface
6 small needle seat
601 annular boss
7 needle tube
8 spring
9 core bar
10 core rod head
1001 holding projection
11 piston
12 buffer rubber plug
1201 second external conical surface
And 13, sealing rings.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the invention has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive, of the scope of the invention.
Referring to fig. 1, a rebound type injector with a shielding needle eccentric separation blade comprises a protective cover 1, a large needle base 2, an eccentric separation blade 3, a needle cylinder 4, a buffer support 5, a small needle base 6, a needle tube 7, a spring 8, a core rod 9, a core rod head 10, a piston 11, a buffer rubber plug 12 and a sealing ring 13.
A needle through hole 101 which penetrates through along the axis is formed in the protective cover 1.
The front end of big needle file 2 is connected with the rear end of visor 1, and the front portion in the big needle file 2 is equipped with the elasticity buckle body 201 that sets up along the axis, the preceding big back of cavity taper shape and front end that elasticity buckle body 201 is big back are connected with the preceding terminal surface of big needle file 2, and the inner wall of elasticity buckle body 201 is equipped with along the bellied annular buckle 202 of circumference, follows in the rear end face of elasticity buckle body 201 and is equipped with first interior conical surface.
The eccentric blocking pieces 3 are arranged in the protective cover 1, the eccentric blocking pieces 3 are arranged along the radial surface and are axially limited forwards and backwards by the internal structure of the protective cover 1 and the front end surface of the large needle base 2, and the number of the eccentric blocking pieces 3 is more than 1; referring to fig. 2 and 3, the eccentric blocking piece 3 is provided with a through eccentric hole 301, the eccentric hole 301 is provided with a fillet along the edge, the rear end face of the eccentric blocking piece 3 is provided with a plurality of blind holes 302 uniformly distributed on the circumferential side of the eccentric hole 301 along the circumferential direction, and the outer contour of the eccentric blocking piece 3 is provided with more than 2 fulcrums.
The shape of the outer contour of the eccentric baffle 3, the number of the supporting points and the distribution positions of the supporting points are variable. In this embodiment, referring to fig. 2, the outer contour of the eccentric baffle 3 is provided with 6 fulcrums, which are 2 fulcrums a303, 2 fulcrums b304, and 2 fulcrums c305, and the eccentric baffle 3 has 2 postures in a balanced state in the protection cover 1, referring to fig. 4 and 5.
The front end of cylinder 4 is connected with the rear end of big needle file 2, and the front end inner wall of cylinder 4 is equipped with along the bellied annular barb 401 of circumference, annular barb 401 supports the rear end face of big needle file 2 to extend to in the rear end of big needle file 2, with spacing behind buffer support 5.
Be equipped with in the little needle file 6 along the axis around the needle fixed orifices and the feed liquor hole of intercommunication, the anterior of little needle file 6 is installed in the elasticity buckle body 201 of big needle file 2, and the anterior outer wall of little needle file 6 is equipped with the ring groove along the circumference indent, ring groove cooperatees with the ring buckle 202 of the elasticity buckle body 201, and the rear portion of little needle file 6 is installed in buffering support 5, and the rear portion outer wall of little needle file 6 is equipped with along the bellied annular boss 601 of circumference, follows in the rear end face of little needle file 6 and is equipped with the second internal conical surface.
The needle point at the front end of the needle tube 7 passes through the eccentric hole 301 of the eccentric baffle 3 and the needle through hole 101 of the protective cover 1 and then is exposed, and the rear end of the needle tube 7 is fixed in the needle fixing hole of the small needle seat 6.
The spring 8 is arranged in the buffer bracket 5 and sleeved at the rear part of the small needle seat 6, the front end of the spring 8 abuts against the inner side of the front end face of the buffer bracket 5, the rear end of the spring 8 abuts against the annular boss 601 of the small needle seat 6, and the spring 8 is in a compressed state.
The core bar 9 is arranged in the injection syringe body, and the core bar 9 is a hollow rod body with an opening at the front.
The front end of the core rod head 10 extends into the rear end of the large needle base 2, the front end surface of the core rod head 10 is matched with the rear end surface of the buffer support 5, the inner wall of the front end of the core rod head 10 is provided with a clamping bulge 1001 which is bulged along the circumferential direction, and the rear part of the core rod head 10 is sleeved at the front end of the core rod 9.
The piston 11 is installed in the injection syringe body and is sleeved on the front part of the core rod head 10.
The buffering rubber plug 12 is arranged in the front end of the core rod head 10 and is clamped by the clamping bulge 1001 of the core rod head 10, the buffering rubber plug 12 seals the inner wall of the front end of the core rod head 10, and the outer edge of the front end face of the buffering rubber plug 12 is provided with a second outer conical surface 1201 matched with the second inner conical surface of the small needle seat 6.
Referring to fig. 1, the rebound syringe is in an unused state.
Referring to fig. 6, when the pull-back syringe is used for injection, the core rod 9 is pushed, the core rod 9, the core rod head 10, the piston 11 and the buffer rubber plug 12 move forward together to feed the injection, and when the core rod 9 is pushed to the bottom, the buffer rubber plug 12 is pressed against the rear end of the small needle base 6. The thrust to the core rod 9 is set to the value required by the normal use of the injector, so that the advanced self-destruction of the product caused by excessive thrust can be avoided.
Referring to fig. 7, after the injection liquid is fed into the pull-back type injector, an additional pushing force is applied to the core rod 9, so that the core rod 9 continues to move forward, and the pull-back type injector is triggered to enter a self-destruction state. The core rod head 10 pushes the buffering support 5 forward along with the forward movement of the core rod 9, the front end of the buffering support 5 is pushed into the rear end of the elastic buckle body 201 of the large needle base 2 through the matching of the first outer conical surface 501 and the first inner conical surface, so that the elastic buckle body 201 is expanded and deformed, the annular buckle 202 on the inner wall of the elastic buckle body 201 is separated from the annular clamping groove of the small needle base 6, the small needle base 6 can move axially, the axial constraint force of the annular boss 601 of the small needle base 6 on the spring 8 is relieved, and the elastic force of the compressed spring 8 is released. The elastic force released by the compressed spring 8 directly acts on the small needle seat 6, and because the rear end of the small needle seat 6 props against the buffering rubber plug 12, the elastic force overcomes the restraint force axially born by the buffering rubber plug 12 to separate the buffering rubber plug 12 from the core rod head 10, and then the small needle seat 6, the needle tube 7 and the buffering rubber plug 12 are rebounded to the core rod 9 together. When the needle tip of the needle tube 7 exits the eccentric hole 301 of the eccentric baffle 3, the eccentric baffle 3 which is not supported by the needle tube 7 can freely move along the radial surface in the protective cover 1 until reaching a balanced state, the eccentric baffle 3 in the balanced state is in contact with the inner wall of the protective cover 1 through a fulcrum on the outer contour to keep balance, the solid surface of the eccentric baffle 3 blocks the needle through hole 101 of the protective cover 1, the needle tube 7 which can still axially move is effectively prevented from passing through the eccentric baffle 3 forwards, and the blind hole 302 on the peripheral side of the eccentric hole 301 prevents the needle tip of the needle tube 7 from being led into the eccentric hole 301 through a fillet. So far, the pull-back syringe is in a self-destruction state. Wherein, the force value for pushing the core bar 9 to enable the product to reach the self-destruction state should exceed the reasonable range of the force value required by the pushing force on the core bar 9 under the normal use condition of the injector, and the force value can not be easily reached by the user under the normal use condition, but the difficulty degree of the force applied by the user is not increased; the elastic force released by the compressed spring 8 is enough to overcome the restraint force axially borne by the buffer rubber plug 12, so that the small needle seat 6, the needle tube 7 and the buffer rubber plug 12 are rebounded into the core rod 9 together.
In addition, the number of the eccentric blocking pieces 3 in the embodiment is 3, and the number of the eccentric blocking pieces 3 may be more or less as long as the needle through hole 101 of the protective cover 1 can be blocked. The 3 eccentric flaps 3 have 2 postures in a balanced state in the protective cover 1, see fig. 8 and 9. In a posture of the 3 eccentric flaps 3 shown in fig. 8 in a balanced state, the center distance between the eccentric hole 301 of the eccentric flap 3 and the needle through hole 101 of the protective cover 1 is L1, and the movement locus of the eccentric hole 301 is a circle having a radius of R1 (R1 = L1); in another posture of the 3-piece eccentric shutter 3 shown in fig. 9 in the balanced state, the center distance between the eccentric hole 301 of the eccentric shutter 3 and the needle through hole 101 of the protective cover 1 is L2, and the movement locus of the eccentric hole 301 is a circle having a radius of R2 (R2 = L2). Wherein, the diameter of the eccentric hole 301 of the eccentric baffle 3 is D, the diameter of the needle through hole 101 of the protective cover 1 is D, L1 > (D + D)/2, L2 > (D + D)/2, and L1 (R1) and L2(R2) can be the same or different. Thus, the eccentric hole 301 of the eccentric cam 3 is kept in a state of not intersecting with and overlapping with the needle through hole 101 of the protective cover 1 in a balanced state, and the edge of the eccentric hole 301 can shield the needle hole of the needle tube 7.
It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are given by way of illustration of the invention and are not intended to limit the invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.
Claims (8)
1. The utility model provides a resilience formula syringe with eccentric separation blade of shield needle which characterized in that includes:
a protective cover, in which a needle through hole is formed;
the front end of the large needle base is connected with the rear end of the protective cover, the front part in the large needle base is provided with an elastic buckling body, and the inner wall of the elastic buckling body is provided with an annular buckle;
the eccentric blocking pieces are arranged in the protective cover, are arranged along the radial surface, are axially limited by the internal structure of the protective cover and the front end surface of the large needle base, are more than 1 piece, are provided with eccentric holes, are provided with a plurality of blind holes arranged on the peripheral side of the eccentric holes along the circumferential direction on the rear end surface, and are provided with more than 2 fulcrums on the outer contour;
the front end of the needle cylinder is connected with the rear end of the large needle seat, and the inner wall of the front end of the needle cylinder is provided with an annular barb which extends into the rear end of the large needle seat;
the buffer bracket is arranged at the rear part in the large needle base;
the front part of the small needle seat is arranged in the elastic buckle body of the large needle seat, the outer wall of the front part of the small needle seat is provided with an annular clamping groove matched with the annular buckle of the large needle seat, the rear part of the small needle seat is arranged in the buffer bracket, and the outer wall of the rear part of the small needle seat is provided with an annular boss;
the needle tip at the front end of the needle tube passes through the eccentric hole of the eccentric retaining sheet and the needle through hole of the protective cover and then is exposed, and the rear end of the needle tube is fixed on the small needle base;
the spring is arranged in the buffer bracket and sleeved at the rear part of the small needle seat, and two ends of the spring respectively abut against the inner side of the front end face of the buffer bracket and the annular boss of the small needle seat and are in a compressed state;
the core rod is arranged in the injection syringe body and is a hollow rod body with an opening at the front;
the front end of the core rod head extends into the rear end of the large needle seat, the front end surface of the core rod head is matched with the rear end surface of the buffer bracket, and the rear part of the core rod head is connected with the front end of the core rod;
the piston is sleeved at the front part of the core rod head; and
the buffering rubber plug is clamped and arranged in the front end of the core rod head;
when the needle tube is self-destructed, the core rod is pushed, the core rod head pushes the buffer support forwards, the front end of the buffer support is pushed into the rear end of the elastic buckling body of the large needle base, the elastic buckling body is expanded and deformed, the annular buckle on the inner wall of the elastic buckling body of the large needle base is separated from the annular clamping groove of the small needle base, the elastic force released by the compressed spring enables the small needle base, the needle tube and the buffer rubber plug to rebound backwards into the core rod, after the needle point of the needle tube retreats out of the eccentric hole of the eccentric block piece, the eccentric block piece without the support of the needle tube freely moves along the radial surface in the protective cover until reaching a balanced state, the eccentric block piece in the balanced state is in contact with the inner wall of the protective cover through the fulcrum on the outline to keep balance, the solid surface of the eccentric block piece.
2. The resilient syringe with the shielding needle eccentric baffle according to claim 1, wherein the elastic buckle body of the protective cover is in a hollow conical shape with a large front end and a small back end, and the front end of the elastic buckle body is connected with the front end surface of the large needle seat.
3. The resilient syringe with the shielding needle eccentric baffle according to claim 1, wherein the rear end inner edge of the elastic buckle body of the protective cover is provided with a first inner conical surface, and the front end outer edge of the buffering support is provided with a first outer conical surface matched with the first inner conical surface.
4. The resilient syringe with the shielding needle eccentric baffle according to claim 1, wherein the buffer bracket is provided at the outer wall of the rear portion thereof with a sealing ring mounting groove, and a sealing ring is mounted in the sealing ring mounting groove.
5. The resilient syringe with the shielding needle eccentric baffle according to claim 1, wherein the small needle seat is provided therein with a needle fixing hole and a liquid inlet hole which are communicated back and forth along an axis.
6. The resilient syringe with the shielding needle eccentric baffle according to claim 1, wherein the rear end surface of the small needle holder is provided with a second inner conical surface at the inner edge, and the front end surface of the buffering rubber plug is provided with a second outer conical surface matched with the second inner conical surface at the outer edge.
7. The resilient syringe with the shielding needle eccentric baffle according to claim 1, wherein the inner wall of the front end of the core rod head is provided with a clamping bulge protruding along the circumferential direction, and the clamping bulge clamps the buffer rubber plug.
8. The resilient syringe with a shielded needle eccentric baffle according to claim 1, wherein the eccentric aperture of the eccentric baffle is provided with a rounded corner along the edge.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010071612.5A CN111012975A (en) | 2020-01-21 | 2020-01-21 | Resilience type injector with shielding needle eccentric baffle |
| PCT/CN2021/072632 WO2021147840A1 (en) | 2020-01-21 | 2021-01-19 | Spring-back syringe having shielding needle eccentric baffle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010071612.5A CN111012975A (en) | 2020-01-21 | 2020-01-21 | Resilience type injector with shielding needle eccentric baffle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111012975A true CN111012975A (en) | 2020-04-17 |
Family
ID=70203107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010071612.5A Pending CN111012975A (en) | 2020-01-21 | 2020-01-21 | Resilience type injector with shielding needle eccentric baffle |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111012975A (en) |
| WO (1) | WO2021147840A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021147840A1 (en) * | 2020-01-21 | 2021-07-29 | 贝普医疗科技有限公司 | Spring-back syringe having shielding needle eccentric baffle |
| CN114869423A (en) * | 2022-05-12 | 2022-08-09 | 连云港市妇幼保健院(连云港市第三人民医院) | Painful branch of academic or vocational study puncture injection needle pipe support with dismouting and locking function |
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| CN201020109Y (en) * | 2007-04-06 | 2008-02-13 | 魏川人 | Simple safety self-destructing injector |
| US20120172799A1 (en) * | 2009-09-10 | 2012-07-05 | Bo Jiang | Disposable safety syringe with retractable needle tip |
| WO2015070523A1 (en) * | 2013-10-18 | 2015-05-21 | 王祖扬 | Pulled-back fixed-needle safe self-destroying syringe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021147840A1 (en) * | 2020-01-21 | 2021-07-29 | 贝普医疗科技有限公司 | Spring-back syringe having shielding needle eccentric baffle |
| CN114869423A (en) * | 2022-05-12 | 2022-08-09 | 连云港市妇幼保健院(连云港市第三人民医院) | Painful branch of academic or vocational study puncture injection needle pipe support with dismouting and locking function |
| CN114869423B (en) * | 2022-05-12 | 2023-03-24 | 连云港市妇幼保健院(连云港市第三人民医院) | Painful branch of academic or vocational study puncture injection needle pipe support with dismouting and locking function |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021147840A1 (en) | 2021-07-29 |
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Address after: No.14, Xingji Road, Yongxing street, Longwan District, Wenzhou City, Zhejiang Province Applicant after: Beipu Medical Technology Co.,Ltd. Address before: No.14, Xingji Road, Yongxing street, Longwan District, Wenzhou City, Zhejiang Province Applicant before: Beipu Medical Technology Co.,Ltd. |
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