CN219090589U - Locking type low-residue syringe - Google Patents
Locking type low-residue syringe Download PDFInfo
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- CN219090589U CN219090589U CN202222286056.0U CN202222286056U CN219090589U CN 219090589 U CN219090589 U CN 219090589U CN 202222286056 U CN202222286056 U CN 202222286056U CN 219090589 U CN219090589 U CN 219090589U
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- piston
- protruding rod
- rod
- injector
- liquid outlet
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Abstract
The utility model discloses a locking type low-residue injector, which comprises a needle cylinder, a piston push rod, a piston and a puncture needle head assembly, wherein the piston is arranged on a piston rod, the puncture needle head assembly comprises a needle seat, the needle seat is connected with the needle cylinder through a connector and an interface, the other end of the piston is provided with a protruding rod, the length of the protruding rod is equivalent to the length from the inner bottom of the connector of the needle seat to the piston, and the protruding rod can run in a liquid outlet cavity of the connector. The utility model utilizes the movement of the protruding rod in the liquid outlet cavity of the joint to assist in injecting the injection liquid, thereby reducing the residue of the injection liquid in the inner cavity of the joint and the interface as much as possible, reducing the drug waste and improving the drug utilization rate.
Description
Technical Field
The utility model relates to a syringe, in particular to a locking type low-residue syringe.
Background
The syringe is an indispensable medical appliance in the medical field, and the existing syringe structurally comprises a syringe 1, a syringe plunger 2, a syringe plunger 3 and a puncture needle assembly 4, wherein the liquid outlet end of the syringe is provided with a standard external luer connector 1.2, the liquid outlet through cavity 1.1 in the middle of the connector is communicated with the inner cavity of the syringe, and the needle seat in the puncture needle assembly is provided with a standard internal luer connector. When the injector is assembled and used according to the figure 1, the inner luer cavity of the needle seat is spliced with the outer luer connector on the needle cylinder, a cavity 4.1 is necessarily formed, the injection piston is abutted against the bottom of the needle cylinder and can not be pushed any more after injection pushing is finished, the cavity 4.1 and the liquid outlet cavity 1.1 of the needle cylinder luer connector become dead cavities, a certain amount of liquid medicine is remained in the dead cavities, the medicine is wasted, and in addition, the injection quantity is inaccurate on occasions requiring microinjection, and the treatment effect is affected. When the puncture needle head component is removed, the external luer connector of the needle cylinder and the medical instrument are directly inserted into the mode of injecting the liquid medicine, and medicine residues exist in the cavity of the external luer connector. After the injection piston is pushed to the bottom, the piston is slightly rebounded back, so that the back suction is caused, and the medicine residue is increased.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide the locking type low-residue injector which can eliminate dead space residues as far as possible and cause medicine waste and has lower treatment effect than expected.
The utility model provides a low residual syringe of locking formula, including cylinder, piston push rod, piston and puncture needle subassembly, the piston sets up on the piston rod, puncture needle subassembly including the needle file, be connected through joint and interface between needle file and the cylinder, its structural feature lies in: the other end of the piston is provided with a protruding rod, the length of the protruding rod is equivalent to the length between the inner bottom of the needle seat interface and the piston, and the protruding rod can run in the liquid outlet cavity of the connector.
The other end of the piston of the injector is provided with the protruding rod, and when the injector is used, the protruding rod arranged on the piston can be used for pushing the injection, so that the residual injection can be reduced as much as possible.
The protruding rod is in clearance fit with the liquid outlet cavity.
The clearance fit is adopted to enable the protruding rod to be attached to the liquid outlet hole after the pushing injection is combined.
The inner wall of the liquid outlet cavity of the joint is provided with a convex clamp close to the piston end, and an annular groove clamped with the convex clamp is arranged on the protruding rod and close to the piston end and at the position corresponding to the convex clamp on the inner wall of the liquid outlet cavity of the joint.
The inner wall of the liquid outlet cavity is provided with a convex clamp, and the protruding rod is provided with an annular groove for buckling and stopping after the injection is finished.
The convex card is annular whole circumference or intermittent.
An elongated groove extending in the axial direction of the protruding rod is provided at the outer periphery thereof.
The outer periphery of the protruding rod is provided with a long groove, so that the protruding rod can penetrate into the liquid outlet cavity of the needle cylinder to remove liquid, and the situation that the outer peripheral wall is contacted with the annular convex card of the liquid outlet cavity before the annular groove on the outer peripheral wall is in clamping connection with the annular convex card of the liquid outlet cavity is avoided, and the cavity between the convex card and the injection piston is sealed, so that the residual liquid cannot be injected in a pushing mode.
The cross section of the protruding rod is either a rotary shape or a polygonal shape.
The protruding rod is movably and detachably connected with the piston.
The protruding rod is connected with the piston in a plug-in type.
The plug-in connection is adopted, and the centripetal extrusion generated by the piston can just play a role in matching between the sealing piston and the protruding rod.
The protruding rod and the piston rod are of an integrated structure.
The connector extends into the bottom of the inner cavity of the interface.
The generation of dead space can be reduced as far as possible by extending the joint into the bottom of the inner cavity of the interface.
In summary, compared with the prior art, the utility model has the following advantages:
the other end of the piston is provided with the protruding rod, and the injection liquid is injected in an auxiliary way by utilizing the movement of the protruding rod in the liquid outlet cavity of the connector, so that the residues of the injection liquid in the inner cavities of the connector and the connector can be reduced as much as possible, the drug wave cost is reduced, and the drug utilization rate is improved.
Drawings
Fig. 1 is a schematic structural view of a syringe of the prior art.
Fig. 2 is a schematic structural view of the locking type low residue syringe of the present utility model.
Fig. 3 is a schematic view of the structure of the cylinder of the present utility model.
Fig. 4 is a schematic view of an integrated structure of a piston rod and a protruding rod.
Fig. 5 is a schematic diagram of a piston.
Detailed Description
The present utility model will be described in more detail with reference to examples.
Example 1
The utility model provides a low residual syringe of locking formula, includes cylinder, piston push rod, piston and puncture needle subassembly, the piston sets up on the piston rod, puncture needle subassembly including the needle file, be connected through joint and interface between needle file and the cylinder, be provided with the protruding pole at the other end of piston, the length of protruding pole be equivalent with the length between needle file interface inner bottom to the piston, protruding pole can be at the play liquid hole intracavity of joint operation. The inner wall of the liquid outlet cavity of the joint is provided with a convex clamp close to the piston end, and an annular groove clamped with the convex clamp is arranged on the protruding rod and close to the piston end and at the position corresponding to the convex clamp on the inner wall of the liquid outlet cavity of the joint. An elongated groove extending in the axial direction of the protruding rod is provided at the outer periphery thereof.
As shown in fig. 2, the locking type low-residue injector of the utility model comprises a needle cylinder 1, a piston push rod 2, a piston 3 and a puncture needle head assembly 4, wherein a liquid outlet end joint 1.2 of the needle cylinder is made to fill a cavity of 4.1 in fig. 1 as much as possible, dead space is reduced, and an annular convex card 1.3 distributed in a whole circumference manner is arranged on the inner wall of a liquid outlet through cavity 1.1 and is used for buckling and stopping with an annular groove 2A.1.2 on the piston push rod 2 after injection is ended. The piston push rod 2 is sleeved with the piston end and is provided with a protruding rod 2.1, the periphery of the protruding rod can be a revolution body, the cross section of the protruding rod can be a polygonal body, the length of the protruding rod is just equal to the depth of a liquid through cavity formed by the insertion connection of a needle seat on a puncture needle head assembly and an upper joint of a needle cylinder, the periphery of the protruding rod can penetrate through the liquid through cavity of the needle cylinder, the end of pushing can be attached to the wall of the liquid through cavity of the needle cylinder, the periphery of the protruding rod is provided with an annular groove 2.1.2 which can be fastened with an annular convex card 1.3 on the inner wall of the liquid through cavity 1.1, the periphery of the protruding rod is also provided with a plurality of axial shallow grooves 2.1.1, so that the protruding rod can penetrate into the liquid through cavity of the needle cylinder conveniently, and the periphery of the protruding rod is prevented from being contacted with the annular convex card 1.3 of the liquid through cavity before the annular groove 2.1.2 on the periphery of the needle cylinder is fastened with the annular convex card 1.3 of the liquid through cavity, and the residual liquid is prevented from pushing out. The piston 3 is provided with a through hole 3.1 at the top end of the original piston, so that the piston can be conveniently sleeved and fixed on a piston installation position on the piston push rod, the size of the through hole is matched with the periphery of the protruding rod, the piston and the inner cavity wall of the needle cylinder are assembled in a sliding manner, and the centripetal extrusion generated by the piston can just play a role in sealing the matching surface of the piston and the protruding rod.
The undescribed portion of this embodiment is identical to the prior art.
Claims (10)
1. The utility model provides a low residual syringe of locking formula, is including cylinder, piston push rod, piston and puncture needle subassembly, the piston sets up on the piston rod, puncture needle subassembly including the needle file, be connected its characterized in that through joint and interface between needle file and the cylinder: the other end of the piston is provided with a protruding rod, the length of the protruding rod is equivalent to the length between the inner bottom of the needle seat interface and the piston, and the protruding rod can run in the liquid outlet cavity of the connector.
2. The locking low residue syringe of claim 1, wherein: the protruding rod is in clearance fit with the liquid outlet cavity.
3. The locking low residual injector of claim 2, wherein: the inner wall of the liquid outlet cavity of the joint is provided with a convex clamp close to the piston end, and an annular groove clamped with the convex clamp is arranged on the protruding rod and close to the piston end and at the position corresponding to the convex clamp on the inner wall of the liquid outlet cavity of the joint.
4. A locking low residue syringe as in claim 3 wherein: an elongated groove extending in the axial direction of the protruding rod is provided at the outer periphery thereof.
5. The locking low residual injector of claim 4, wherein: the convex card is annular whole circumference or intermittent.
6. The locking low residual injector of claim 5, wherein: the cross section of the protruding rod is either a rotary shape or a polygonal shape.
7. The locking low residual injector of claim 6, wherein: the protruding rod is movably and detachably connected with the piston.
8. The locking low residual injector of claim 7, wherein: the protruding rod is connected with the piston in a plug-in type.
9. The locking low residual injector of claim 6, wherein: the protruding rod and the piston rod are of an integrated structure.
10. The locking low residual injector of claim 8 or 9, wherein: the connector extends into the bottom of the inner cavity of the interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222286056.0U CN219090589U (en) | 2022-08-30 | 2022-08-30 | Locking type low-residue syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222286056.0U CN219090589U (en) | 2022-08-30 | 2022-08-30 | Locking type low-residue syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219090589U true CN219090589U (en) | 2023-05-30 |
Family
ID=86466476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222286056.0U Active CN219090589U (en) | 2022-08-30 | 2022-08-30 | Locking type low-residue syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219090589U (en) |
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2022
- 2022-08-30 CN CN202222286056.0U patent/CN219090589U/en active Active
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