CN204840538U - Injection with low resistance - Google Patents
Injection with low resistance Download PDFInfo
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- CN204840538U CN204840538U CN201520385036.6U CN201520385036U CN204840538U CN 204840538 U CN204840538 U CN 204840538U CN 201520385036 U CN201520385036 U CN 201520385036U CN 204840538 U CN204840538 U CN 204840538U
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- piston
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- hollow cylinder
- core bar
- barrel
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Abstract
The utility model belongs to the field of medical apparatus, concretely relates to injection with low resistance, including barrel, piston and core bar, the core bar front end sets up the connecting rod, and top phase -match in connecting rod head shape and the barrel is bottom open -ended hollow cylinder below the connecting rod head, and the most peripheral diameter of connecting rod head is greater than hollow cylinder's external diameter and is lighter than the internal diameter of barrel, and the connecting -rod cap position is in hollow cylinder's cavity, the piston tightly overlaps on above -mentioned hollow cylinder's outer circumference, has the ascending ring channel of going up of opening on the up end of piston, has the lower ring channel that open side down on the lower terminal surface, and the periphery of the upper and lower terminal surface of piston all is equipped with the sealing washer, and the external diameter of sealing washer is greater than the internal diameter of barrel. Because the sealing washer and the frictional force between the barrel of the periphery of piston change along with the change of barrel internal pressure, the piston is easy to slide in the barrel, and the resistance is little during the use, is the injection with low resistance of an ideal, the piston keeps sealed through sealing washer and barrel, does not have and leaks.
Description
Technical field
This utility model relates to a kind of injection with low resistance, belongs to medical apparatus field.
Background technology
Syringe is a kind of medical apparatus conventional in clinical, it is made up of cylindrical shell, piston, core bar usually, the syringe of above-mentioned composition is generally made up of macromolecular material, in order to prevent not leaking between piston and cylindrical shell, there is good sealing effectiveness, piston must and cylindrical shell between have enough magnitudes of interference, but the large magnitude of interference makes operator piston just can need be made to move by larger power.Also have glass syringe in addition, be usually made up of cylindrical shell and core bar, between core bar and cylindrical shell, frictional force is little, and resistance is little, and sliding capability is excellent, but apparatus is easily broken in production and transportation, makes it to use.
Utility model content
According to above deficiency of the prior art, the technical problems to be solved in the utility model is: provide the frictional resistance between a kind of piston and cylinder inboard wall can change with pressure size variation and can reduce the injection with low resistance of frictional resistance.
Injection with low resistance described in the utility model, comprise cylindrical shell, piston and core bar, core bar front end arranges connecting rod, connecting rod nose shape and cylindrical shell inner top match, it is the hollow cylinder of bottom opening below connecting rod head, the outermost diameter of connecting rod head is greater than the external diameter of hollow cylinder and is less than the internal diameter of cylindrical shell, and connecting-rod cap portion is positioned at the cavity of hollow cylinder; Piston is tightly placed on the excircle of above-mentioned hollow cylinder, the upper surface of piston there is the upper cannelure of opening upwards, lower surface has the lower cannelure that Open Side Down, the upper and lower end face most peripheral of piston is equipped with sealing ring, and the external diameter of sealing ring is greater than the internal diameter of cylindrical shell.
The inwall of above-mentioned hollow cylinder has anticreep projection, corresponding anticreep projection arranges back-off fixture block at core bar head, core bar head to insert from below in the hollow cylinder of connecting rod and by the cooperation of back-off fixture block, anticreep projection, core bar is engaged with connecting rod, is convenient to the hollow cylinder of core bar head and connecting rod to assemble by this structure.Preferably, the size of the back-off fixture block of core bar head is greater than the size of the anticreep projection of connecting rod hollow cylinder, can make like this in the hollow cylinder of core bar head more firmly Snap joint bar.
V-shaped or the inverted trapezoidal in the notch longitudinal cross-section of the upper cannelure of above-mentioned piston, the notch longitudinal cross-section of lower cannelure is reverse V-shaped or trapezoidal.
Operation principle and process:
When pumping liquid, external atmospheric pressure is higher than the pressure in cylinder lumen and piston, lower cannelure forces the sealing ring of lower surface outwards to open under the effect of external atmospheric pressure, now the sealing ring of lower surface and the contact surface of cylinder inboard wall increase, sealing strengthens, along with pressure reduces, the sealing ring of lower surface shrinks under elastic effect, returns to initial state;
When injecting forward liquid, promote core bar, by the liquid of piston compression inner barrel, make internal pressure be greater than external pressure, upper cannelure makes the sealing ring of upper surface outwards open under pressure, and now the sealing ring of upper surface and the contact surface of cylinder inboard wall increase, sealing strengthens, along with pressure reduces, the sealing ring of upper surface shrinks under elastic effect, returns to initial state.
From the above, this syringe construction is simple, because the frictional force between the sealing ring of piston most peripheral and cylindrical shell changes along with the change of cylinder internal pressure, therefore piston easily slides in cylindrical shell, force of sliding friction is little, and during use, resistance is little, is a kind of desirable injection with low resistance.
Except above-mentioned points, the sealing ring of piston most peripheral keeps sealing with cylinder inboard wall all the time, guarantees syringe in use No leakage.
The beneficial effect that this utility model is compared with prior art had is:
This injection with low resistance structure is simple, and the frictional force between the sealing ring of piston most peripheral and cylindrical shell changes along with the change of cylinder internal pressure, and piston is easily slided in cylindrical shell, and during use, resistance is little; Piston keeps sealing with cylinder inboard wall by the sealing ring of its most peripheral all the time, guarantees syringe in use No leakage.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of core bar;
Fig. 3 is the structural representation of connecting rod;
Fig. 4 is the structural representation of piston.
In figure: 1, cylindrical shell; 2, core bar; 3, piston; 4, connecting rod; 5, core bar head; 6, back-off fixture block; 7, connecting rod head; 8, hollow cylinder; 9, anticreep is protruding; 10, upper cannelure; 11, sealing ring; 12, lower cannelure.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
As shown in figures 1-4, this injection with low resistance comprises cylindrical shell 1, piston 3 and core bar 2, core bar 2 front end arranges connecting rod 4, shape and cylindrical shell 1 inner top of connecting rod head 7 match, connecting rod head less than 7 is the hollow cylinder 8 of bottom opening, the outermost diameter of connecting rod head 7 is greater than the external diameter of hollow cylinder 8 and is less than the internal diameter of cylindrical shell 1, and connecting rod head 7 is positioned at the cavity of hollow cylinder 8; Piston 3 is tightly placed in (namely the external diameter of hollow cylinder 8 is greater than the internal diameter of piston 3) on the excircle of above-mentioned hollow cylinder 8, the upper surface of piston 3 there is the upper cannelure 10 of opening upwards, lower surface there is the lower cannelure 12 that Open Side Down, the upper and lower end face most peripheral of piston 3 is equipped with sealing ring 11, and the external diameter of sealing ring 11 is greater than the internal diameter of cylindrical shell 1.The present embodiment middle cylinder body 1 inner top shape is umbrella, and the connecting rod head 7 therefore matched with cylindrical shell 1 inner top is also for umbrella, and the angular dimension of connecting rod head 7 umbrella changes with the angle of cylindrical shell 1 inner top.
Wherein: the inwall of hollow cylinder 8 has anticreep projection 9, corresponding anticreep projection 9 arranges some back-off fixture blocks 6 at core bar head 5, core bar head 5 to insert from below in the hollow cylinder 8 of connecting rod 4 and by the cooperation of back-off fixture block 6, anticreep projection 9, core bar 2 is engaged with connecting rod 4, is convenient to the hollow cylinder 8 of core bar head 5 with connecting rod 4 to assemble by this structure.Preferably, the size of the back-off fixture block 6 of core bar head 5 is greater than the size of the anticreep projection 9 of connecting rod hollow cylinder 8, makes in the hollow cylinder 8 of core bar head 5 more firmly Snap joint bar 4.V-shaped or the inverted trapezoidal in the notch longitudinal cross-section of the upper cannelure 10 of piston 3, the notch longitudinal cross-section of lower cannelure 12 is reverse V-shaped or trapezoidal.
Operation principle and process:
When pumping liquid, external atmospheric pressure is higher than the pressure in cylindrical shell 1 inner chamber and piston 3, lower cannelure 12 forces the sealing ring 11 of lower surface outwards to open under the effect of external atmospheric pressure, now the sealing ring 11 of lower surface increases with the contact surface of cylindrical shell 1 inwall, sealing strengthens, along with pressure reduces, the sealing ring 11 of lower surface shrinks under elastic effect, returns to initial state;
When injecting forward liquid, promote core bar 2, the liquid of cylindrical shell 1 inside is compressed by piston 3, make internal pressure be greater than external pressure, upper cannelure 10 makes the sealing ring 11 of upper surface outwards open under pressure, and now the sealing ring 11 of upper surface increases with the contact surface of cylindrical shell 1 inwall, sealing strengthens, along with pressure reduces, the sealing ring 11 of upper surface shrinks under elastic effect, returns to initial state.
From the above, this syringe construction is simple, because the frictional force between the sealing ring 11 of piston 3 most peripheral and cylindrical shell 1 changes along with the change of pressure in cylindrical shell 1, therefore piston 3 easily slides in cylindrical shell 1, force of sliding friction is little, and during use, resistance is little, is a kind of desirable injection with low resistance, and piston 3 keeps sealing with cylindrical shell 1 inwall by the sealing ring 11 of its most peripheral all the time, guarantees syringe in use No leakage.
Claims (4)
1. an injection with low resistance, comprise cylindrical shell (1), piston (3) and core bar (2), it is characterized in that: core bar (2) front end arranges connecting rod (4), connecting rod head (7) shape and cylindrical shell (1) inner top match, it is the hollow cylinder (8) of bottom opening below connecting rod head (7), the outermost diameter of connecting rod head (7) is greater than the external diameter of hollow cylinder (8) and is less than the internal diameter of cylindrical shell (1), and connecting rod head (7) is positioned at the cavity of hollow cylinder (8); Piston (3) is tightly placed on the excircle of above-mentioned hollow cylinder (8), the upper surface of piston (3) there is the upper cannelure (10) of opening upwards, lower surface there is the lower cannelure (12) that Open Side Down, the upper and lower end face most peripheral of piston (3) is equipped with sealing ring (11), and the external diameter of sealing ring (11) is greater than the internal diameter of cylindrical shell (1).
2. injection with low resistance according to claim 1, it is characterized in that: the inwall of described hollow cylinder (8) has anticreep projection (9), corresponding anticreep projection (9) arranges back-off fixture block (6) at core bar head (5), and core bar head (5) to insert from below in the hollow cylinder (8) of connecting rod (4) and by the cooperation of back-off fixture block (6), anticreep projection (9), core bar (2) engaged with connecting rod (4).
3. injection with low resistance according to claim 2, is characterized in that: the size of the back-off fixture block (6) of described core bar head (5) is greater than the size of the anticreep projection (9) of connecting rod hollow cylinder (8).
4. injection with low resistance according to claim 1 and 2, it is characterized in that: the V-shaped or inverted trapezoidal in the notch longitudinal cross-section of the upper cannelure (10) of described piston (3), the notch longitudinal cross-section of lower cannelure (12) is reverse V-shaped or trapezoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520385036.6U CN204840538U (en) | 2015-06-05 | 2015-06-05 | Injection with low resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520385036.6U CN204840538U (en) | 2015-06-05 | 2015-06-05 | Injection with low resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204840538U true CN204840538U (en) | 2015-12-09 |
Family
ID=54731139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520385036.6U Active CN204840538U (en) | 2015-06-05 | 2015-06-05 | Injection with low resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204840538U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104906667A (en) * | 2015-06-05 | 2015-09-16 | 山东新华安得医疗用品有限公司 | Low-resistance syringe |
| CN107812281A (en) * | 2017-11-17 | 2018-03-20 | 北京快舒尔医疗技术有限公司 | Needleless injector, needleless injector pencil and its piston rod |
| CN112604082A (en) * | 2020-12-21 | 2021-04-06 | 湖南平安医械科技有限公司 | Pre-pouring type low-resistance injector |
-
2015
- 2015-06-05 CN CN201520385036.6U patent/CN204840538U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104906667A (en) * | 2015-06-05 | 2015-09-16 | 山东新华安得医疗用品有限公司 | Low-resistance syringe |
| CN107812281A (en) * | 2017-11-17 | 2018-03-20 | 北京快舒尔医疗技术有限公司 | Needleless injector, needleless injector pencil and its piston rod |
| CN107812281B (en) * | 2017-11-17 | 2024-04-02 | 北京快舒尔医疗技术有限公司 | Needleless injector, needleless injector medicine tube and piston rod thereof |
| CN112604082A (en) * | 2020-12-21 | 2021-04-06 | 湖南平安医械科技有限公司 | Pre-pouring type low-resistance injector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 255086 No. 999, Zunxian Road, high tech Zone, Zibo City, Shandong Province Patentee after: Shandong ande medical supplies Co.,Ltd. Address before: No.77, North Road, development zone, high tech Zone, Zibo City, Shandong Province Patentee before: SHINVA ANDE HEALTHCARE APPARATUS Co.,Ltd. |