CN104906667A - Low-resistance syringe - Google Patents
Low-resistance syringe Download PDFInfo
- Publication number
- CN104906667A CN104906667A CN201510307057.0A CN201510307057A CN104906667A CN 104906667 A CN104906667 A CN 104906667A CN 201510307057 A CN201510307057 A CN 201510307057A CN 104906667 A CN104906667 A CN 104906667A
- Authority
- CN
- China
- Prior art keywords
- piston
- connecting rod
- hollow cylinder
- cylinder
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
- A61M5/31513—Piston constructions to improve sealing or sliding
-
- 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
- A61M5/48—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 having means for varying, regulating, indicating or limiting injection pressure
- A61M5/482—Varying injection pressure, e.g. by varying speed of injection
-
- 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
- A61M5/48—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 having means for varying, regulating, indicating or limiting injection pressure
- A61M5/484—Regulating injection pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31501—Means for blocking or restricting the movement of the rod or piston
- A61M2005/31508—Means for blocking or restricting the movement of the rod or piston provided on the piston-rod
Landscapes
- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention belongs to the field of medical appliances and particularly relates to a low-resistance syringe, comprising a cylinder, a piston and a mandrel. The front end of the mandrel is provided with a connecting rod; the head of the connecting rod matches with the inner top of the cylinder in shape; the part, below the head, of the connecting rod is a hollow cylinder which opens at the bottom; the outermost diameter of the head of the connecting rod is greater than the outer diameter of the hollow cylinder and less than the inner diameter of the cylinder; the head of the connecting rod is located within a cavity of the hollow cylinder; a piston tightly sleeves the outer periphery of the hollow cylinder; the upper end face of the piston is provided with an upper circular groove which opens up; the lower end face of the piston is provided with a lower circular groove which opens down; the outermost sides of the upper and lower end faces of the piston are both provided with seal rings; the outer diameter of the seal rings is greater than the inner diameter of the cylinder. Since the friction between the seal rings on the outermost side of the piston and the cylinder changes with the changes in the interior pressure of the cylinder, the piston easily slides in the cylinder, with low resistance occurring during using; the low-resistance syringe is ideal; the piston keeps the cylinder sealed via the seal rings, and no leakage occurs.
Description
Technical field
The present invention relates to a kind of injection with low resistance, belong 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.
Summary of the invention
According to above deficiency of the prior art, the technical problem to be solved in the present invention 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 of the present invention, 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 the present invention 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 invention;
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, embodiments of the invention are 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 1 and 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 |
|---|---|---|---|
| CN201510307057.0A CN104906667B (en) | 2015-06-05 | 2015-06-05 | Injection with low resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510307057.0A CN104906667B (en) | 2015-06-05 | 2015-06-05 | Injection with low resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104906667A true CN104906667A (en) | 2015-09-16 |
| CN104906667B CN104906667B (en) | 2018-10-19 |
Family
ID=54076365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510307057.0A Active CN104906667B (en) | 2015-06-05 | 2015-06-05 | Injection with low resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104906667B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5397313A (en) * | 1994-01-27 | 1995-03-14 | The Kendall Company | Low friction syringe |
| CN2870870Y (en) * | 2005-09-09 | 2007-02-21 | 余利荣 | Low-resistance syringe |
| CN201022890Y (en) * | 2007-01-19 | 2008-02-20 | 江西洪达医疗器械集团有限公司 | Low-resistance syringe rubber plug |
| EP2165723A1 (en) * | 2007-06-26 | 2010-03-24 | Terumo Kabushiki Kaisha | Medical container |
| CN201558383U (en) * | 2009-10-16 | 2010-08-25 | 黄文林 | Piston for low-resistance portable type injector |
| CN201735023U (en) * | 2010-07-19 | 2011-02-09 | 余利荣 | Novel low-resistance injector |
| CN101987219A (en) * | 2010-12-06 | 2011-03-23 | 李业中 | Rubber plug of low-resistance syringe |
| CN202620377U (en) * | 2012-05-25 | 2012-12-26 | 山东新华安得医疗用品有限公司 | Low-resistance injector |
| CN202982804U (en) * | 2012-12-28 | 2013-06-12 | 江西洪达医疗器械集团有限公司 | Low-resistance injector |
| CN204840538U (en) * | 2015-06-05 | 2015-12-09 | 山东新华安得医疗用品有限公司 | Injection with low resistance |
-
2015
- 2015-06-05 CN CN201510307057.0A patent/CN104906667B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5397313A (en) * | 1994-01-27 | 1995-03-14 | The Kendall Company | Low friction syringe |
| CN2870870Y (en) * | 2005-09-09 | 2007-02-21 | 余利荣 | Low-resistance syringe |
| CN201022890Y (en) * | 2007-01-19 | 2008-02-20 | 江西洪达医疗器械集团有限公司 | Low-resistance syringe rubber plug |
| EP2165723A1 (en) * | 2007-06-26 | 2010-03-24 | Terumo Kabushiki Kaisha | Medical container |
| CN201558383U (en) * | 2009-10-16 | 2010-08-25 | 黄文林 | Piston for low-resistance portable type injector |
| CN201735023U (en) * | 2010-07-19 | 2011-02-09 | 余利荣 | Novel low-resistance injector |
| CN101987219A (en) * | 2010-12-06 | 2011-03-23 | 李业中 | Rubber plug of low-resistance syringe |
| CN202620377U (en) * | 2012-05-25 | 2012-12-26 | 山东新华安得医疗用品有限公司 | Low-resistance injector |
| CN202982804U (en) * | 2012-12-28 | 2013-06-12 | 江西洪达医疗器械集团有限公司 | Low-resistance injector |
| CN204840538U (en) * | 2015-06-05 | 2015-12-09 | 山东新华安得医疗用品有限公司 | Injection with low resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104906667B (en) | 2018-10-19 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| GR01 | Patent grant | ||
| 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. |
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| CP03 | Change of name, title or address |