CN211634681U - Pull-back syringe with shielding needle eccentric blocking piece - Google Patents
Pull-back syringe with shielding needle eccentric blocking piece Download PDFInfo
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- CN211634681U CN211634681U CN202020139179.XU CN202020139179U CN211634681U CN 211634681 U CN211634681 U CN 211634681U CN 202020139179 U CN202020139179 U CN 202020139179U CN 211634681 U CN211634681 U CN 211634681U
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Abstract
A pull-back injector with an eccentric barrier of a shielding needle comprises a needle cylinder, a core bar, a piston, a needle seat, an elastic support fastener, the needle cylinder and an eccentric barrier, wherein the inside of a cylinder neck at the front end of the needle cylinder is divided into a cylinder neck front cavity and a cylinder neck rear cavity through an inner partition plate, the eccentric barrier is installed in the cylinder neck front cavity, an eccentric hole and a plurality of blind holes are formed in the eccentric barrier, and more than 2 pivots are arranged on the outer contour of the eccentric barrier; a needle seat is arranged in the back cavity of the cylinder neck; the inner wall of the rear part of the needle cylinder is provided with an annular stop step which protrudes along the circumferential direction, the outer wall of the front part of the core bar is provided with a baffle and an elastic barb which are arranged in front and back, and the baffle and the elastic barb are matched with the annular stop step of the needle cylinder; the needle point of the needle tube is exposed after passing through the eccentric hole of the eccentric baffle and the needle through hole at the front end of the needle cylinder. The whole structure is compact, the self-destruction operation is simple, and the convenience and the safety of the product are improved.
Description
Technical Field
The utility model belongs to the technical field of the syringe, concretely relates to pull-back syringe with eccentric separation blade of shielding needle.
Background
The existing pull-back type 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 use convenience and reliability of the pull-back type syringe product.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pull-back syringe with shielding needle eccentric separation blade to above-mentioned problem.
The purpose of the utility model can be realized by the following technical scheme: a pull-back injector with a shielding needle eccentric baffle comprises a needle cylinder, a core bar, a piston, a needle seat, an elastic support clamping piece and a needle tube, wherein an inner baffle plate with a central hole is arranged in a cylinder neck at the front end of the needle cylinder, a cylinder neck inner cavity of the needle cylinder is divided into a cylinder neck front cavity and a cylinder neck rear cavity by the inner baffle plate, the cylinder neck front cavity is communicated with a needle through hole at the front end of the needle cylinder, and the needle seat is arranged in the cylinder neck rear cavity; the inner wall of the rear part of the needle cylinder is provided with an annular stop step protruding along the circumferential direction, the outer wall of the front part of the core bar is provided with a blocking piece and an elastic barb which are arranged in front and back, and the blocking piece and the elastic barb are matched with the annular stop step of the needle cylinder;
the needle cylinder is characterized by further comprising eccentric blocking pieces, wherein the eccentric blocking pieces are installed in a cylinder neck front cavity of the needle cylinder, are arranged along the radial surface and are axially limited by an inner structure of the cylinder neck front cavity and an inner partition plate, the number of the eccentric blocking pieces is more than 1, eccentric holes are formed in the eccentric blocking pieces, a plurality of blind holes arranged on the peripheral sides of the eccentric holes along the circumferential direction are formed in the rear end surfaces of the eccentric blocking pieces, and more than 2 supporting points are arranged on the outer contour of each eccentric blocking piece; the rear end of the needle tube is fixed on the needle base, and the needle point at the front end of the needle tube is exposed after passing through the eccentric hole of the eccentric baffle and the needle through hole of the needle cylinder;
when the core rod is pulled back to drive the needle point of the needle tube to exit the eccentric hole of the eccentric block piece, the eccentric block piece without the support of the needle tube can freely move along the radial surface in the front cavity of the cylinder neck of the needle tube until reaching a balanced state, the eccentric block piece in the balanced state is contacted with the inner wall of the front cavity of the cylinder neck of the needle tube through a fulcrum on the outer contour to keep balance, the solid surface of the eccentric block piece blocks the needle through hole of the needle tube, and the needle point of the blind hole on the peripheral side of the eccentric hole avoids entering the eccentric hole;
when the elastic barb of the pulled-back core rod passes over the annular stop step of the needle cylinder, the annular stop step of the needle cylinder is clamped between the blocking piece of the core rod and the elastic barb to limit the axial movement of the core rod.
Furthermore, a convex tooth sleeve is arranged on the inner wall of the rear cavity of the cylinder neck of the needle cylinder close to the front part, and a tooth hub matched with the tooth sleeve of the needle cylinder is arranged on the outer wall of the middle part of the needle seat.
Furthermore, the inner wall of the rear cavity of the cylinder neck of the needle cylinder is provided with an annular retaining groove which is inwards concave along the circumferential direction, and the rear part of the elastic support clamping piece is in a disc shape and is matched with the annular retaining groove of the needle cylinder.
Furthermore, the outer wall of the front end of the core rod is provided with an inverted buckle, the front part of the elastic support clamping piece is installed in a cavity at the rear part of the needle seat in a buckling and matching mode, the front part of the elastic support clamping piece is in a hollow cylindrical shape, and the inner wall of the front part of the elastic support clamping piece is provided with a buckle matched with the inverted buckle of the core rod.
Further, the outer wall of the rear portion of the needle seat is provided with a sealing ring mounting groove which is inwards concave along the circumferential direction, and a sealing ring is mounted in the sealing ring mounting groove.
Furthermore, the outer wall of the front part of the core rod is provided with an elastic support body, and the elastic support body is matched with the rear end surface and the inner wall of the piston.
Furthermore, the outer wall of the rear part of the core rod is provided with a safety disc, and the safety disc is matched with the rear end surface and the inner wall of the needle cylinder.
Furthermore, the edge of the eccentric hole of the eccentric baffle is provided with a fillet.
Compared with the prior art, the beneficial effects of the utility model are that: when the core rod is pulled back to drive the needle tip of the needle tube to retreat out of the eccentric hole of the eccentric separation blade, the eccentric separation blade blocks the needle through hole of the needle tube, and the needle tube which can still axially move is effectively prevented from penetrating through the eccentric separation blade forwards. The inner wall of the rear part of the needle cylinder is provided with an annular stop step, the outer wall of the front part of the core rod is provided with a separation blade and an elastic barb which are matched, when the elastic barb of the pulled-back core rod passes over the annular stop step of the needle cylinder, the annular stop step of the needle cylinder is clamped between the separation blade and the elastic barb of the core rod to limit the axial movement of the core rod, so that the elastic support clamping piece, the needle seat, the needle tube and the piston are left in the needle cylinder. 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 preliminary state.
FIG. 8 is a schematic structural diagram of an embodiment in a fully self-destruct state.
Fig. 9 is a schematic view of an embodiment of a 3-piece eccentric block in a balanced state.
Fig. 10 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 Syringe
101 inner partition board
102 front cavity of neck
103 rear cavity of neck
104 tooth sleeve
105 annular retaining groove
106 annular stop step
107 pin through hole
2 eccentric block piece
201 eccentric hole
202 blind hole
203 fulcrum a
204 fulcrum b
205 fulcrum c
3 core bar
301 back-off
302 elastic support
303 baffle plate
304 elastic barb
305 safety plate
4 piston
5 needle seat
501 tooth hub
6 elastic support fastener
601 fastener
7 needle tube
8 sealing rings.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings to make it clear to those skilled in the art how to practice the invention. While the invention has been described in connection with its preferred embodiments, these embodiments are intended to be illustrative, and not to limit the scope of the invention.
Referring to fig. 1, the pull-back type syringe with the shielding needle eccentric blocking piece comprises a syringe 1, an eccentric blocking piece 2, a core bar 3, a piston 4, a needle base 5, an elastic supporting clamping piece 6, a needle tube 7 and a sealing ring 8.
An inner partition plate 101 with a central opening is arranged in a cylinder neck at the front end of the cylinder 1, the inner cavity of the cylinder neck of the cylinder 1 is divided into a cylinder neck front cavity 102 and a cylinder neck rear cavity 103 by the inner partition plate 101, the cylinder neck front cavity 102 is communicated with a needle through hole 107 at the front end of the cylinder 1, a raised tooth sleeve 104 is arranged on the inner wall of the cylinder neck rear cavity 103 close to the front, an annular retaining groove 105 which is recessed along the circumferential direction is arranged on the inner wall of the cylinder neck rear cavity 103 close to the rear, and an annular retaining step 106 which is raised along the circumferential direction is arranged on the inner wall of the rear part of the cylinder 1.
The eccentric baffle plates 2 are arranged in a cylinder neck front cavity 102 of the needle cylinder 1, the eccentric baffle plates 2 are arranged along the radial surface and are axially limited forwards and backwards by the internal structure of the cylinder neck front cavity 102 and an inner baffle plate 101, and the number of the eccentric baffle plates 2 is more than 1; referring to fig. 2 and 3, the eccentric baffle 2 is provided with a through eccentric hole 201, the edge of the eccentric hole 201 is provided with a fillet, the rear end face of the eccentric baffle 2 is provided with a plurality of blind holes 202 uniformly distributed on the peripheral side of the eccentric hole 201 along the circumferential direction, and the outer contour of the eccentric baffle 2 is provided with more than 2 fulcrums.
The shape of the outer contour of the eccentric baffle piece 2, 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 blocking sheet 2 is provided with 6 fulcrums, which are 2 fulcrums a203, 2 fulcrums b204, and 2 fulcrums c205, and the eccentric blocking sheet 2 has 2 postures in the balanced state in the front cavity 102 of the neck of the syringe 1, referring to fig. 4 and 5.
The core rod 3 is arranged in the needle cylinder 1, the outer wall of the front end of the core rod 3 is provided with a reverse buckle 301, the outer wall of the front part of the core rod 3 is provided with an elastic support body 302, a blocking piece 303 and an elastic barb 304 which are sequentially arranged from front to back, the elastic support body 302 is matched with the rear end surface and the inner wall of the piston 4, the blocking piece 303 and the elastic barb 304 are matched with an annular stop step 106 of the needle cylinder 1, the outer wall of the rear part of the core rod 3 is provided with a safety sheet 305, and the safety sheet 305 is matched with the rear end surface and the inner wall.
The piston 4 is sleeved on the front part of the core rod 3.
The front part of the elastic support clamping piece 6 is installed in a cavity at the rear part of the needle seat 5 in a clamping and buckling mode, the front part of the elastic support clamping piece 6 is in a hollow cylindrical shape, a clamping buckle 601 matched with a reverse buckle 301 at the front end of the core rod 3 is arranged on the inner wall of the front part of the elastic support clamping piece 6, the rear part of the elastic support clamping piece 6 is arranged outside an opening of the cavity at the rear part of the needle seat 5, and the rear part of the elastic support clamping piece 6 is in a disc shape and is matched with an annular retaining groove.
The needle point at the front end of the needle tube 7 passes through the eccentric hole 201 of the eccentric baffle plate 2 and the needle through hole 107 of the needle cylinder 1 and then is exposed, and the rear end of the needle tube 7 is fixed in the needle fixing hole of the needle seat 5.
The sealing ring 8 is arranged in the sealing ring mounting groove of the needle seat 5, and the sealing ring 8 is in sealing fit with the inner wall of the back cavity 103 of the cylinder neck of the needle cylinder 1.
Referring to fig. 1, when the pull-back type syringe is in a state of being used or being filled with injection liquid, the front portion of the core rod 3 and the piston 4 are positioned in the rear end of the cylinder 1, and the elastic barb 304 of the core rod 3 is positioned in front of the annular stop step 106 of the cylinder 1.
Referring to fig. 6, when injecting using the pull-back type syringe, the core rod 3 is pushed to advance the core rod 3 and the plunger 4 together to feed the injection solution, and when the core rod 3 is pushed to the bottom, the plunger 4 abuts against the needle holder 5. In the process of forward movement of the core rod 3, the safety sheet 305 of the core rod 3 is matched with the rear end face of the needle cylinder 1 to limit the forward movement of the core rod 3, so that self-destruction caused by excessive pushing is avoided. The undercut 301 of the stem 3 remains behind the catch 601 of the resilient support catch 6 and does not interlock forward past the catch 601 of the resilient support catch 6.
Referring to fig. 7, after the injection liquid is fed into the pull-back type injector, the safety disc 305 of the core rod 3 is firstly pressed down, so that the safety disc 305 is clamped in the inner hole of the syringe 1, and the core rod 3 is in a state of being capable of being continuously pushed. The core rod 3 is continuously pushed, the core rod 3 continuously moves forwards, the elastic support body 302 of the core rod 3 enters the inner hole of the piston 4 from the rear end face of the piston 4, the back-off 301 of the core rod 3 forwards crosses the buckle 601 of the elastic support clamping piece 6 to form interlocking, and the pull-back type injector enters a self-destruction preliminary state.
Referring to fig. 8, after the pull-back type injector enters a self-destruction preliminary state, the core rod 3 is pulled back, the front end of the core rod 3 and the elastic support fastener 6 form interlocking, the elastic support 302 of the core rod 3 tightly supports the piston 4, and the elastic support fastener 6, the needle stand 5, the needle tube 7 and the piston 4 retreat together with the core rod 3. When the needle point of the needle tube 7 exits the eccentric hole 201 of the eccentric block piece 2, the eccentric block piece 2 which loses the support of the needle tube 7 can freely move along the radial surface in the cylinder neck front cavity 102 of the needle cylinder 1 until reaching a balanced state, the eccentric block piece 2 in the balanced state is contacted with the inner wall of the cylinder neck front cavity 102 of the needle cylinder 1 through a fulcrum on the outer contour to keep balance, the solid surface of the eccentric block piece 2 blocks the needle through hole 107 of the needle cylinder 1, the needle tube 7 which can still axially move is effectively prevented from passing through the eccentric block piece 2 forwards, and the blind hole 202 on the peripheral side of the eccentric hole 201 prevents the needle point of the needle tube 7 from being led into the eccentric. After the elastic barb 304 of the core rod 3 passes over the annular stop step 106 of the needle cylinder 1, the annular stop step 106 of the needle cylinder 1 is clamped between the blocking piece 303 of the core rod 3 and the elastic barb 304, the annular stop step 106 of the needle cylinder 1 is matched with the blocking piece 303 of the core rod 3 to limit the core rod 3 to continuously retreat, and the elastic barb 304 of the needle cylinder 1 is matched with the blocking piece 303 of the core rod 3 to limit the core rod 3 to move forwards. Then, the core rod 3 is broken off from the notch of the core rod 3, at this time, the front part of the core rod 3, the elastic support clamping piece 6, the needle seat 5, the needle tube 7 and the piston 4 are remained in the needle cylinder 1, the needle tube 7 is completely shielded, and the pull-back type injector is in a complete self-destruction state.
In addition, the number of the eccentric blocking pieces 2 in the present embodiment is 3, and the number of the eccentric blocking pieces 2 may be more or less as long as the needle through hole 107 of the needle cylinder 1 can be blocked. The 3-piece eccentric retainer 2 has 2 postures in a balanced state in the neck front chamber 102 of the cylinder 1, see fig. 9 and 10. In a posture of the 3 eccentric flaps 2 shown in fig. 9 in a balanced state, the center distance between the eccentric hole 201 of the eccentric flap 2 and the needle through hole 107 of the cylinder 1 is L1, and the movement locus of the eccentric hole 201 is a circle having a radius of R1 (R1 = L1); in the other posture of the 3 eccentric flaps 2 in the balanced state shown in fig. 10, the center distance between the eccentric hole 201 of the eccentric flap 2 and the needle through hole 107 of the cylinder 1 is L2, and the movement locus of the eccentric hole 201 is a circle having a radius of R2 (R2 = L2). Wherein, the diameter of the eccentric hole 201 of the eccentric baffle 2 is D, the diameter of the needle through hole 107 of the needle cylinder 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 201 of the eccentric cam 2 is kept in a state of not intersecting with and overlapping with the needle through hole 107 of the needle cylinder 1 in a balanced state, and the edge of the eccentric hole 201 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 are possible, which are fully described, and are not limited to the specific examples of the above embodiments. The above embodiments are merely illustrative of the present invention and are not intended to limit the present 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. A pull-back injector with an eccentric baffle of a shielding needle comprises a needle cylinder, a core rod, a piston, a needle seat, an elastic supporting clamping piece and a needle tube, and is characterized in that,
an inner partition plate with a central opening is arranged in the cylinder neck at the front end of the cylinder, the inner cavity of the cylinder neck of the cylinder is divided into a cylinder neck front cavity and a cylinder neck rear cavity by the inner partition plate, the cylinder neck front cavity is communicated with the needle through hole at the front end of the cylinder, and a needle seat is arranged in the cylinder neck rear cavity; the inner wall of the rear part of the needle cylinder is provided with an annular stop step protruding along the circumferential direction, the outer wall of the front part of the core bar is provided with a blocking piece and an elastic barb which are arranged in front and back, and the blocking piece and the elastic barb are matched with the annular stop step of the needle cylinder;
the needle cylinder is characterized by further comprising eccentric blocking pieces, wherein the eccentric blocking pieces are installed in a cylinder neck front cavity of the needle cylinder, are arranged along the radial surface and are axially limited by an inner structure of the cylinder neck front cavity and an inner partition plate, the number of the eccentric blocking pieces is more than 1, eccentric holes are formed in the eccentric blocking pieces, a plurality of blind holes arranged on the peripheral sides of the eccentric holes along the circumferential direction are formed in the rear end surfaces of the eccentric blocking pieces, and more than 2 supporting points are arranged on the outer contour of each eccentric blocking piece; the rear end of the needle tube is fixed on the needle base, and the needle point at the front end of the needle tube is exposed after passing through the eccentric hole of the eccentric baffle and the needle through hole of the needle cylinder;
when the core rod is pulled back to drive the needle point of the needle tube to exit the eccentric hole of the eccentric block piece, the eccentric block piece without the support of the needle tube can freely move along the radial surface in the front cavity of the cylinder neck of the needle tube until reaching a balanced state, the eccentric block piece in the balanced state is contacted with the inner wall of the front cavity of the cylinder neck of the needle tube through a fulcrum on the outer contour to keep balance, the solid surface of the eccentric block piece blocks the needle through hole of the needle tube, and the needle point of the blind hole on the peripheral side of the eccentric hole avoids entering the eccentric hole;
when the elastic barb of the pulled-back core rod passes over the annular stop step of the needle cylinder, the annular stop step of the needle cylinder is clamped between the blocking piece of the core rod and the elastic barb to limit the axial movement of the core rod.
2. The retractable syringe with the shielding needle eccentric baffle as claimed in claim 1, wherein the inner wall of the rear cavity of the neck of the needle cylinder is provided with a convex tooth sleeve in front, and the outer wall of the middle part of the needle seat is provided with a tooth hub matched with the tooth sleeve of the needle cylinder.
3. The retractable syringe with the shielding needle eccentric baffle according to claim 1, wherein the inner wall of the back cavity of the syringe neck is provided with an annular retaining groove which is inwards concave along the circumferential direction, and the rear part of the elastic support fastener is disc-shaped and matched with the annular retaining groove of the syringe.
4. The retractable syringe with the shielding needle eccentric baffle according to claim 1, wherein the front outer wall of the core rod is provided with an inverse buckle, the front part of the elastic support clamping piece is installed in the cavity at the rear part of the needle seat through a buckle type fit, the front part of the elastic support clamping piece is in a hollow cylindrical shape, and the inner wall of the front part of the elastic support clamping piece is provided with a buckle matched with the inverse buckle of the core rod.
5. The pull-back syringe with the shielding needle eccentric baffle according to claim 1, wherein the outer wall of the rear part of the needle seat is provided with a sealing ring installation groove which is inwards concave along the circumferential direction, and a sealing ring is installed in the sealing ring installation groove.
6. The retractable syringe with the shielding needle eccentric baffle as claimed in claim 1, wherein the front outer wall of the core rod is provided with an elastic support body, and the elastic support body is matched with the rear end surface and the inner wall of the piston.
7. The retractable syringe with the shielding needle eccentric baffle plate as claimed in claim 1, wherein the rear outer wall of the core rod is provided with a safety plate, and the safety plate is matched with the rear end surface and the inner wall of the syringe.
8. The retractable syringe with the eccentric shielding plate of shielding needle as set forth in claim 1, wherein the eccentric hole of the eccentric shielding plate is provided with a rounded corner along the edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020139179.XU CN211634681U (en) | 2020-01-21 | 2020-01-21 | Pull-back syringe with shielding needle eccentric blocking piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020139179.XU CN211634681U (en) | 2020-01-21 | 2020-01-21 | Pull-back syringe with shielding needle eccentric blocking piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211634681U true CN211634681U (en) | 2020-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020139179.XU Active CN211634681U (en) | 2020-01-21 | 2020-01-21 | Pull-back syringe with shielding needle eccentric blocking piece |
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| Country | Link |
|---|---|
| CN (1) | CN211634681U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021147839A1 (en) * | 2020-01-21 | 2021-07-29 | 贝普医疗科技有限公司 | Pull-back syringe having shielding needle eccentric baffle |
-
2020
- 2020-01-21 CN CN202020139179.XU patent/CN211634681U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021147839A1 (en) * | 2020-01-21 | 2021-07-29 | 贝普医疗科技有限公司 | Pull-back syringe having shielding needle eccentric baffle |
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| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No.14, Xingji Road, Yongxing street, Longwan District, Wenzhou City, Zhejiang Province Patentee after: Beipu Medical Technology Co.,Ltd. Address before: No.14, Xingji Road, Yongxing street, Longwan District, Wenzhou City, Zhejiang Province Patentee before: Beipu Medical Technology Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |