CN2870870Y - Low-resistance syringe - Google Patents
Low-resistance syringe Download PDFInfo
- Publication number
- CN2870870Y CN2870870Y CN 200520014802 CN200520014802U CN2870870Y CN 2870870 Y CN2870870 Y CN 2870870Y CN 200520014802 CN200520014802 CN 200520014802 CN 200520014802 U CN200520014802 U CN 200520014802U CN 2870870 Y CN2870870 Y CN 2870870Y
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- China
- Prior art keywords
- sealing ring
- injection
- piston
- push rod
- low resistance
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- Expired - Fee Related
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Abstract
The utility model discloses a low-resistance syringe composed of a syringe cylinder body and a liquid pushing piston sliding inside the cylinder body, which is characterized in that the piston is an annular seal ring of which the end surface has a round of open slot; a piston fixing device comprises an interlocking part equipped on the top of the seal ring and a supporting part equipped on the bottom of the seal ring, wherein, the edge of the interlocking part is equipped with a flange of which the lower end is exactly wedged into the open slot on the end surface of the seal ring, and the supporting part fixes the seal ring to the bottom of the interlocking part. With the syringe of such structure, the seal ring may be expanded or shrunk along with the change of air pressure inside the cylinder body, and its contact surface with the inner wall of the syringe cylinder body will vary with the change of air pressure inside the cylinder body; using such seal ring as the piston of the syringe brings a high sensitivity, once the pressure inside the cylinder body changes, the seal ring will be expanded or shrunk to get the effect of low resistance and powerful sealing.
Description
Technical field
This utility model relates to a kind of medical syringe, a kind of injection with low resistance of frictional resistance between particularly a kind of plunger that can reduce the injector syringe inwall and slide within it.
Background technology
Syringe is that an indispensable apparatus is gone up in medical treatment, known glass syringe, its injection cylinder is made by glass, the shortcoming of this glass syringe is broken easily in transportation, cause out of use consequence, if injection cylinder adopts other material substitution, in order to prevent piston leakage on every side, obtain a good leakproof seal effect, piston must compress cylinder inboard wall, if cylinder inboard wall is smooth inadequately, piston just is difficult to move in cylindrical shell, the operator must just can make piston move with bigger power, how to reduce the injector cartridge inwall and the piston that slides within it between the problem of frictional resistance, become a great problem of present syringe construction design.
Prior art makes and with lubricator reduces frictional resistance between piston and the cylinder inboard wall, a kind of lubricant that generally uses is silicone oil, but use this lubricant and be out of favour, because this lubricant is understood disperse or is dissolved in the medicinal liquid, thereby medicinal liquid is polluted, therefore people once attempted exploring not with lubricator and syringe still can leakproof and method that piston is slided easily, this trial comprises uses various piston profile, for example: be provided with one or more rib that in cylindrical shell, stretches out forward or backward on the piston, reduce the purpose of frictional resistance therebetween so as to reducing contact surface between piston and cylinder inboard wall, reaching.And for example: Chinese patent 95193831.2 (publication number: CN1152882A, open day: on June 25th, 1997) disclose a kind of " injection with low resistance ", the piston rod of this syringe can make the piston distortion, its radial wall is drawn back from cylinder inboard wall, thereby reduce the friction between piston and the barrel, but these syringes all can not be with the tightness between automatic regulating piston of the variation of cylinder internal pressure and barrel, can not effectively reduce the frictional resistance between piston and the barrel, not reach comparatively ideal effect.
Summary of the invention
The technical problems to be solved in the utility model is: provide a kind of can be with the tightness between automatic regulating piston of the variation of cylinder internal pressure and barrel, effectively reduce the frictional resistance between piston and the injection tube inwall, still can keep injection with low resistance simultaneously with the cylinder inboard wall sealing.
In order to solve above-mentioned technical problem, this utility model adopts following technical scheme: a kind of injection with low resistance, comprise the injection stack shell and in stack shell, slide push away the fluid column plug, pushing away the fluid column plug is made of push rod and piston, piston is fixed by piston fixing device and push rod, it is characterized in that: described piston is O-ring seal, and the end face of sealing ring is provided with a circle open slot along its circumferencial direction; Described piston fixing device has gomphosis part that is arranged on the sealing ring top and the support component that is arranged on the sealing ring below, the edge of gomphosis part is provided with a circle and corrects the flange that is embedded in the sealing ring end face open slot down, and support component is fixed on the gomphosis part below with sealing ring.
Adopt the syringe of this structure, because of being provided with a circle open slot in the sealing ring, the gomphosis part of sealing ring top is provided with flange, sealing ring can squeeze to hold and rise big or resilience is dwindled with the change of cylindrical shell inner air pressure, contact surface between it and injection cylinder inwall will change with the change of cylindrical shell inner air pressure, make syringe piston with this kind sealing ring, compare with existing syringe piston, its sensitivity is higher, cylinder internal pressure one changes, sealing ring will squeeze to open and rise big or resilience is dwindled, sealing ring and injection cylinder inner wall sealing had both been guaranteed, do not leak, reduce simultaneously again sealing ring because of be squeezed and the injection cylinder inwall between the frictional resistance that produces, thereby reach lower resistance, the purpose of strong sealing.
As a kind of preferred structure of the present utility model, the longitudinal section semicircular in shape of flange, the longitudinal section of sealing ring open slot is V-shaped.The sealing ring of this kind structure, flange are easy to sealing ring squeezed and open, and the sealing ring resilience is stronger, and the pressure-dependent sensitivity of sealing ring is improved.
As a kind of preferred structure of the present utility model, the longitudinal section of sealing ring is right-angled trapezium wide at the top and narrow at the bottom.The sealing ring and the contact surface between the cylinder inboard wall of this shape are less, and frictional resistance between the two is also less accordingly.
As further improvement of the present utility model, the bottom surface of described sealing ring is provided with a circle open slot along its circumferencial direction, and support component is provided with and corrects the flange that is embedded in the open slot of sealing ring bottom surface.The syringe of this kind structure, the sealing ring tow sides are equipped with a circle open slot, can remedy the sealing ring that has only one side to establish open slot, the insufficient problem of sealing ring size adjustment degree when on push rod, pushing away, no matter this syringe is pushed away on being or drop-down, the sealing circle can both play regulating action, makes the sensitivity of sealing ring higher, play the effect of two-ways regulation, and arrive the purpose of lower resistance, strong sealing.
As further improvement of the present utility model, the gomphosis part of piston fixing device links to each other with the push rod upper end, and support component is the rib muscle on the push rod, and is this simple in structure, is easy to make.Perhaps gomphosis part links to each other with the upper end of the fixed core that wears sealing ring, and support component is enclosed within outside the fixed core, and supports sealing ring, and another conventional seals snare is under support component, and the fixed core lower end links to each other with push rod.This kind structure relatively is convenient to assembling.
Description of drawings
Fig. 1 is the cutaway view of first specific embodiment of this utility model.
Fig. 2 is the cutaway view of second specific embodiment of this utility model.
Fig. 3 is the vertical view of this utility model sealing ring.
Fig. 4 is the zoomed-in view of first kind of sealing ring longitudinal section of this utility model.
Fig. 5 is the zoomed-in view of first kind of sealing ring longitudinal section of this utility model
The specific embodiment
Figure 1 shows that the cutaway view of first kind of specific embodiment of utility model, comprise injection cylinder (1) and in cylindrical shell (1), slide push away fluid column plug (2), pushing away fluid column plug (2) is made of push rod (3) and piston (4), piston (4) is fixed by piston fixing device and push rod (3), the O-ring seal (5) of this piston (4) for making by flexible material, the longitudinal section of sealing circle (5) preferably is right-angled trapezium (as shown in Figure 4) wide at the top and narrow at the bottom, the sealing ring and the contact surface between the cylinder inboard wall of this shape are less, frictional resistance between the two is correspondingly also less, the end face of sealing ring (5) is provided with the open slot (6) that extends along the whole circumference direction, the longitudinal section of sealing circle open slot (6) can be the V-arrangement like shears mouth sample, also can be semicircle, U-shaped, when the open slot longitudinal section is V-arrangement by contrast, the resilience force of sealing ring is stronger, preferred V-arrangement, piston fixing device has gomphosis part (7) that is arranged on sealing ring (5) top and the support component (8) that is arranged on sealing ring (5) below, gomphosis part (7) links to each other with push rod (3) upper end, support component (8) is the rib muscle on the push rod (3), the surface configuration of this gomphosis part (7) can be the umbrella shape that matches with stack shell (1), conical, certainly other shape that also matches with cylindrical shell (1), the edge of gomphosis part (7) is provided with a circle and corrects the flange (9) that is embedded in sealing ring (5) the end face open slot (6) down, this flange (9) up broadens gradually from the lower end, and be wider than the width of open slot (6) opening part, this flange (9) when pressing down squeezes open slot (6) and opens, the best semicircular in shape in longitudinal section of flange (9), the flange of this shape (9) is easy to sealing ring (5) squeezed and opens, and sealing ring (5) is fixed on gomphosis part (7) below by support component (8).
When resting state, sealing ring (5) is a minima with the contact surface of injection cylinder (1) inwall, following pulling-pushing rod (3) suction medicinal liquid, produce negative pressure in the cylindrical shell (1), attract sealing ring (5) to move upward, the embedding down of flange (9) on the gomphosis part (7), the opening of sealing ring (5) is squeezed to be opened, sealing ring (5) rises greatly, and contact surface strengthens between injection cylinder (1), and sealing is strengthened, and flange (9) embeds deep more seal and just increases big more, syringe can not leaked because of the change of barrel pressure, with reducing of negative pressure value, sealing ring (5) moves downward, sealing ring (5) resilience, and contact surface reduces between injection cylinder (1) inwall, and the frictional resistance between injection cylinder (1) inwall reduces; On push rod (3), sealing ring (5) is subjected to the extruding of air in the cylindrical shell, the opening of sealing ring (5) is squeezed to be opened, sealing ring (5) rises greatly, and contact surface strengthens between injection cylinder (1) inwall, sealing is strengthened, reduce with the cylindrical shell inner air pressure, sealing ring (5) resilience, and contact surface reduces between injection cylinder (1) inwall, and the frictional resistance between injection cylinder (1) inwall reduces, and makes syringe piston with this kind sealing ring, compares with existing syringe piston, on the one hand the contact surface between it and injection cylinder inwall is less, contact surface between the opposing party it and injection cylinder inwall can change with the change of cylindrical shell inner air pressure, and its sensitivity is higher, and cylinder internal pressure one changes, sealing ring will squeeze to open and rise big or resilience is dwindled, sealing ring and injection cylinder inner wall sealing had both been guaranteed, do not leak, reduce simultaneously again sealing ring because of be squeezed and the injection cylinder inwall between the frictional resistance that produces, thereby should reach lower resistance, the purpose of strong sealing.
For the sensitivity that makes the sealing ring adjusting of using as piston is strengthened, the longitudinal section of sealing ring (5) is the rectangle (as shown in Figure 5) of the gap that is combined into of two right-angled trapezium along continuous straight runs symmetries, the bottom surface of sealing ring (5) also is provided with a circle open slot (12) along its circumferencial direction, correspondingly be provided with and correct the flange (13) that is embedded in sealing ring (5) the bottom surface open slot (12) as the rib muscle of the push rod (3) of support component (8), this flange (13) down broadens gradually from the upper end, and be wider than the width of open slot (12) opening part, this flange (13) is gone up when pressing open slot squeezed and is opened.
Push rod like this (3), down motion under the pressure of sealing circle (5) air in cylindrical shell (1), flange (13) on push rod (3) the rib muscle is gone up embedding, it is just dark more that the same big more flange of pressure (13) embeds open slot (12), otherwise it is just shallow more, this kind structure, can remedy the sealing ring that has only end face to establish open slot, the insufficient problem of sealing ring size adjustment degree when on push rod, pushing away, no matter this syringe is pushed away on being or drop-down, sealing ring can both play regulating action, makes the sensitivity of sealing ring higher, play the effect of two-ways regulation, and arrive lower resistance, the purpose of strong sealing.
Figure 2 shows that the cutaway view of second kind of specific embodiment of the present utility model, wherein provided another kind of piston fixing device, the gomphosis part of this piston fixing device (7) links to each other with the upper end of the fixed core that wears sealing ring (5) (10), support component (8) is enclosed within outside the fixed core (10), and support sealing ring (5), in order to be maintained fixed sealing between core (10) and the support component (8), another conventional seals circle (11) is enclosed within the support component (8), and fixed core (10) lower end links to each other with push rod (3).Fixed core (10) is provided with the female thread that matches with external screw thread on the push rod (3), or is provided with and projection that push rod (3) convex platform fastens, or fixed core (10) is injection molded into one with push rod (3).This kind structure is suitable for the syringe that sealing ring (5) end face is provided with open slot (6), and this kind structure relatively is convenient to assembling.
This kind syringe construction is simple, and cost of manufacture is low, and piston is easy to move in cylindrical shell, and good airproof performance is a kind of ideal injection with low resistance.
Claims (8)
1, a kind of injection with low resistance, comprise injection stack shell (1) and stack shell (1) in slip push away fluid column plug (2), pushing away fluid column plug (2) is made of push rod (3) and piston (4), piston (4) is fixed by piston fixing device and push rod (3), it is characterized in that: described piston (4) is O-ring seal (5), and the end face of sealing ring (5) is provided with a circle open slot (6) along its circumferencial direction; Described piston fixing device has gomphosis part (7) that is arranged on sealing ring (5) top and the support component (8) that is arranged on sealing ring (5) below, the edge of gomphosis part (7) is provided with a circle and corrects the flange (9) that is embedded in (6) in sealing ring (5) the end face open slot down, and support component (8) is fixed on gomphosis part (7) below with sealing ring (5).
2, a kind of injection with low resistance as claimed in claim 1 is characterized in that: the longitudinal section semicircular in shape of described flange (9), the longitudinal section of described sealing ring (5) open slot (6) is V-shaped.
3, a kind of injection with low resistance as claimed in claim 1 or 2 is characterized in that: the longitudinal section of described sealing ring (5) is right-angled trapezium wide at the top and narrow at the bottom.
4, a kind of injection with low resistance as claimed in claim 3 is characterized in that: described gomphosis part (7) links to each other with push rod (3) upper end, and support component (8) is the rib muscle on the push rod (3).
5, a kind of injection with low resistance as claimed in claim 3, it is characterized in that: described gomphosis part (7) links to each other with the upper end of the fixed core that wears sealing ring (5) (10), support component (8) is enclosed within outside the fixed core (10), and support sealing ring (5), another conventional seals circle (11) is enclosed within the support component (8), and fixed core (10) lower end links to each other with push rod (3).
6, a kind of injection with low resistance as claimed in claim 1 or 2, it is characterized in that: the bottom surface of described sealing ring (5) is provided with a circle open slot (12) along its circumferencial direction, and described support component (8) is provided with and corrects the flange (13) that is embedded in sealing ring (5) the bottom surface open slot (12).
7, a kind of injection with low resistance as claimed in claim 6 is characterized in that: the longitudinal section of described sealing ring (5) is the rectangle of the gap that is combined into of two right-angled trapezium along continuous straight runs symmetries.
8, a kind of injection with low resistance as claimed in claim 7 is characterized in that: described gomphosis part (7) links to each other with push rod (3) upper end, and support component (8) is the rib muscle on the push rod (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520014802 CN2870870Y (en) | 2005-09-09 | 2005-09-09 | Low-resistance syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520014802 CN2870870Y (en) | 2005-09-09 | 2005-09-09 | Low-resistance syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2870870Y true CN2870870Y (en) | 2007-02-21 |
Family
ID=37739220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520014802 Expired - Fee Related CN2870870Y (en) | 2005-09-09 | 2005-09-09 | Low-resistance syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2870870Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435871C (en) * | 2005-09-09 | 2008-11-26 | 余利荣 | Injection with low resistance |
| 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 |
-
2005
- 2005-09-09 CN CN 200520014802 patent/CN2870870Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435871C (en) * | 2005-09-09 | 2008-11-26 | 余利荣 | Injection with low resistance |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070221 |