CN202605442U - Low resistance syringe - Google Patents
Low resistance syringe Download PDFInfo
- Publication number
- CN202605442U CN202605442U CN 201220128323 CN201220128323U CN202605442U CN 202605442 U CN202605442 U CN 202605442U CN 201220128323 CN201220128323 CN 201220128323 CN 201220128323 U CN201220128323 U CN 201220128323U CN 202605442 U CN202605442 U CN 202605442U
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- China
- Prior art keywords
- piston
- pressing plate
- union joint
- face
- depression
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- 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.)
- Expired - Lifetime
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Abstract
The utility model discloses a low resistance syringe. The low resistance syringe comprises an outer sleeve, a piston and an injection rod, the piston is arranged at the head end of the injection rod, a connector is connected with the head end of the injection rod, the piston is sleeved on the connector in a sealing mode, a recessed portion is arranged at the front end of the piston to the least extent, a pressing plate is arranged on the connector, the diameter of the outer end of the pressing plate is larger than that of a front end opening of the recessed portion, the depth of the recessed portion is equal to the thickness of the pressing plate, the length difference between the connector and the piston is equal to the depth of the recessed portion, and a lip edge is arranged on the outer periphery of the front end of the piston. According to the low resistance syringe, when the piston is pushed and pulled, by means of air pressure expansion of cavities at the front and rear ends and the extrusion of the pressing plate, the piston can self-adapt to pressure of the outer sleeve inner hole wall, and the pushing and pulling resistance of the syringe is reduced.
Description
Technical field
This utility model relates to a kind of injection device, particularly relates to a kind of injector for medical purpose of lower resistance, and it comprises overcoat, piston and injection rod; Said piston is arranged on the head end of said injection rod.
Background technology
Syringe is a kind of medical apparatus and instruments commonly used.Usually syringe comprises overcoat and piston push rod.In order to obtain a better seal effect, piston need carry out tighter applying with outer casing inner wall.Consequently operator's operation is very difficult, has greatly increased the labor intensity of user.Notification number is that the Chinese invention patent of CN100435871C discloses a kind of injection with low resistance, comprise the injection stack shell and in stack shell, slide push away the fluid column plug, piston is O-ring seal, the end face of sealing ring is provided with a circle open slot along its circumferencial direction; 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; Sealing ring can squeeze to hold and rise big or resilience is dwindled with the change of cylindrical shell inner air pressure, and the contact surface between it and injection cylinder inwall will change with the change of cylindrical shell inner air pressure, makes syringe piston with this kind sealing ring; Its sensitivity is higher; Cylinder internal pressure one changes, and sealing ring will squeeze to open and rise big or resilience is dwindled, thereby reaches the purpose of lower resistance, strong sealing.Because the piston of this syringe is to adopt a circle open slot and a gomphosis part on it to realize.Gomphosis part also inwardly struts when piston is outwards strutted, makes the endoporus of piston tighten the periphery at push rod.Therefore, the syringe of this piston structure can be locked with the piston fastening when push rod spurs, and inserts also no longer makes piston outwards strut, and can not reach the sealing with stack shell.
The utility model content
The technical problem that this utility model will solve provides a kind of injection with low resistance; It is through improving piston structure; Make syringe sealing load of piston and overcoat when push rod promotes depend on the pressure in the overcoat ante-chamber, therefore, when syringe slowly promotes, have less resistance.And adopt a union joint to cooperate with piston, and make push rod when pulling, piston only outwards struts with overcoat and produces effectively sealing, and is same, the speed when sealing pressure depends on the push rod pulling.Therefore, when user slowly spurs push rod, has less resistance.Thereby the syringe that utilizes this utility model can realize alleviating the purpose of the labor intensity of user.
The above-mentioned technical problem of this utility model mainly is able to solve through following technical proposals: a kind of injection with low resistance comprises overcoat, piston and injection rod; Said piston is arranged on the head end of said injection rod; Head end at said injection rod is connected with a union joint, and said piston seal is set on the said union joint; At least the front end at said piston is provided with a depression; On said union joint, be provided with a pressing plate, the outer end diameter of pressing plate is greater than the front port diameter of said depression; The degree of depth of said depression equals the thickness of said pressing plate; The length difference of said union joint and said piston equals the degree of depth of said depression; On the neighboring of said piston nose, be provided with a lip limit.Through the air pressure distending and the pressing plate extruding of piston front and back end chamber when the push-and-pull, make the pressure of piston self adaptation and overcoat inner hole wall, reduced the push-and-pull resistance of syringe.
Kill in order to make the depression on the effective extrusion piston front end of pressing plate and to prevent pressing plate and cave in to push, said depression is the rounding frustum, and the coning angle of this depression is less than the coning angle of said inverted cone pressing plate, and differential seat angle is 5～15 degree.
As further optimal technical scheme, on said piston other end, be provided with an end face bulge loop; The height of said end face bulge loop is less than the degree of depth of said depression.When push rod promotes, be used for the sealing with push rod, and make union joint promote lower platen from depression, to deviate from, piston is made the self adaptation distending, realize the lower resistance injection by the pressure of piston nose chamber at push rod.
As further optimal technical scheme, said lip cross section comprises near the segmental arc of said piston nose face with away from the flat segments of said piston nose face; The angle of the outer peripheral face of said flat segments and said piston is 120～160 degree.Through the lip setting of this structure, make piston when promoting, have more consistent pressure with the overcoat inner hole wall with pulling.
As further optimal technical scheme, the ante-chamber end face of said overcoat is the consistent taper seat of coning angle with the pressing plate end face of said union joint pressing plate.Make piston injection preferably or air-out and can not produce excessive absorption affinity after promotion with the ante-chamber end face.
Said union joint rear end is provided with an axial connecting hole, is provided with an internal projecting ring in the connecting hole; Said injection rod head end be provided with one with the outer bulge loop of said internal projecting ring clamping.Through this interface arrangment, push rod can more easily snap in the union joint, realizes the push pull maneuver in the piston its external sleeve.
The technical scheme of this utility model adopts depression and the pressing plate on the union joint on the piston nose, realizes to piston when the push-and-pull and the squeeze pressure self adaptation of overcoat inner hole wall realization syringe lower resistance in use.Simultaneously, through the structure optimization of lip, make syringe when promoting, have more consistent squeeze pressure with pulling action.
Description of drawings
Fig. 1 is the structural representation of this utility model.
Fig. 2 is the structural representation of overcoat in this utility model.
Fig. 3 is a structure of piston sketch map in this utility model.
Fig. 4 is the structural representation of union joint in this utility model.
Fig. 5 is the structural representation of push rod in this utility model.
Wherein, overcoat 1, ante-chamber 101, ante-chamber end face 1011, back cavity 102, push rod 2, connecting portion 201, outer bulge loop 202, omoplate portion 203, fracture mouthfuls 204, piston 3, depression 301, depression side face 3011, depression port 3012, lip 302, segmental arc 3021, flat segments 3022, piston inner hole 303, sealing bulge loop 304, end face bulge loop 305, depression cone angle alpha, union joint 4, pressing plate 401, pressing plate side face 4011, pressing plate end face 4012, pressing plate cone angle beta, cervical region 402, connecting hole 403, internal projecting ring 404.
Pass through embodiment below, and combine accompanying drawing, do further bright specifically the technical scheme of this utility model.
The specific embodiment
Referring to Fig. 1, a kind of injection with low resistance comprises the push rod 2 in the overcoat 1 and its external sleeve 1 that is slidingly connected.Head end at push rod 2 is connected with a piston 3 through a union joint 4.Piston 3 is dynamically connected as sealed sliding with overcoat 1 endoporus, forms ante-chamber 101 that is positioned at piston 3 front ends and the back cavity 102 that is positioned at piston 3 rear ends in its external sleeve 1 endoporus.
Referring to Fig. 2 and Fig. 4, its external sleeve ante-chamber 101 has an ante-chamber end face 1011, is provided with an injection outlet in the middle of the end face.This ante-chamber end face 1011 is the conical surface of a big cone angle.Front end at union joint 4 also is provided with a pressing plate end face 4012, and this pressing plate end face 4012 is provided with a conical surface that cooperates with ante-chamber end face 1011.After push rod 2 was promoted forward, the pressing plate end face of union joint 4 4012 was fitted with the ante-chamber end face 1011 of overcoat 1, realized injection or in order to discharge the air in the overcoat ante-chamber 101.
The front end of union joint 4 is a pressing plate 401, is provided with a cervical region 402 in the rear end of pressing plate 401, in the middle of cervical region 402, is a connecting hole 403, is provided with an internal projecting ring 404 near mouth end place in the connecting hole 403.On pressing plate 401 peripheries of union joint 4, be provided with a pressing plate side face 4011.This pressing plate side face 4011 is a conical surface, is provided with a pressing plate cone angle beta, and this pressing plate cone angle beta is 60 degree.
Referring to Fig. 3, piston 3 is set on the cervical region 402 of union joint 4 through the intermediary piston inner hole 303 of piston.Be provided with a depression 301 at piston 3 head ends, on the neighboring of piston 3 these female ends, be provided with a lip 302.Be provided with sealing bulge loop 304 in two roads at piston inner hole 303 near recess, on piston 3 rear end faces, be provided with end face bulge loop 305 one near piston inner hole 303 places.This depression 301 is provided with the depression side face 3011 of a circular cone, and its depression cone angle alpha is 50 degree.Depression port 3012 diameters of depression 301 are slightly less than the diameter before the union joint pressing plate 401.Union joint 4 is set in the piston inner hole 303 through cervical region 402, is dynamically connected as sealed sliding through the sealing bulge loop in the piston inner hole 303 304.The pressing plate 401 of union joint 4 is engaged in the depression 301 of piston 3.Because the somewhat larger in diameter of pressing plate 401 front ends is in the cave in diameter of 301 ports of piston; And the pressing plate cone angle beta of pressing plate side face 4011 is greater than the depression cone angle alpha of depression side face 3011, so the pressing plate side face 4011 of pressing plate 401 contacts with depression port 3012; And when under union joint 4 drives, doing axially-movable; Pressing plate side face 4011 extruding depressions 301 make piston 3 near the outside distending of the outer peripheral face of female ends, make lip 302 and overcoat 1 inner hole wall form sealing.
Referring to Fig. 5, the cross section of push rod 2 is cross, is provided with a connecting portion 201 at head end, is provided with one in the position after a while of connecting portion 201 and fractures mouthfuls 204.This connecting portion 201 comprises the hemispherical head structure in the connecting hole 403 that can insert union joint 4, on this connecting portion 201, is provided with bulge loop 202 outside.These connecting portion 201 cross sections also are cross, and outer bulge loop 202 is alternate four parts.Push rod 2 is connected with union joint 4 with internal projecting ring 404 cooperations in union joint 4 connecting holes 403 through the outer bulge loop 202 on this connecting portion 201.Be provided with an omoplate portion 203 in the rear end of connecting portion 201, when promoting in push rod 2 its external sleeve 1 with piston 3 on end face bulge loop 305 offset the formation end face seal.Syringe is after using, and the push rod that can fracture through the mouth 204 that fractures on the push rod 2 prevents the repeated use of syringe.
Syringe in use; Through promoting push rod 2 piston 3 is moved forward along overcoat 1 inner hole wall, owing in ante-chamber 101, have air, the air pressure that produces when piston 3 moves is extruding in depression 301; Piston lip 302 and overcoat 1 inner hole wall are adjacent to, form sealing.Because the sealing load of this lip 302 and overcoat 1 inner hole wall is from the air pressure of ante-chamber 101, therefore, make mobile in piston 3 its external sleeve 1 inner hole wall have less resistance.And when extracting action through push rod 2 pulling pistons 3; Push rod 2 is through internal projecting ring 404 and outer bulge loop 202 pulling union joints 4; Make the pressing plate 401 extruding depressions 301 on the union joint 4; Form effective sealing with the piston recess, simultaneously, lip 302 outside distendings and overcoat 1 inner hole wall on the piston form effective sealing.The degree of lip 302 outside distendings depends on the extruding degree of 401 pairs of depressions 301 of pressing plate.Therefore, slower then this piston 3 of speed is just more little with the resistance of overcoat 1 inner hole wall.Pressure depends on the translational speed in piston 3 its external sleeve 1.
The foregoing description is in order more to be expressly understood this utility model; Not as a kind of restriction to this utility model right; Under the prerequisite that does not break away from this utility model aim; Various variations can be arranged, and all these will be included within the scope of this claim the conspicuous modification of said those skilled in the art.
Claims (10)
1. an injection with low resistance comprises overcoat, piston and injection rod; Said piston is arranged on the head end of said injection rod; It is characterized in that: the head end at said injection rod is connected with a union joint, and said piston seal is set on the said union joint; At least the front end at said piston is provided with a depression; On said union joint, be provided with a pressing plate, the outer end diameter of pressing plate is greater than the front port diameter of said depression; The degree of depth of said depression equals the thickness of said pressing plate; The length difference of said union joint and said piston equals the degree of depth of said depression; On the neighboring of said piston nose, be provided with a lip limit.
2. syringe according to claim 1 is characterized in that: said depression is the rounding frustum, and the coning angle of this depression is less than the coning angle of said inverted cone pressing plate, and differential seat angle is 5～15 degree.
3. syringe according to claim 1 and 2 is characterized in that: on said piston other end, be provided with an end face bulge loop; The height of said end face bulge loop is less than the degree of depth of said depression.
4. syringe according to claim 1 and 2 is characterized in that: said lip cross section comprises near the segmental arc of said piston nose face with away from the flat segments of said piston nose face; The angle of the outer peripheral face of said flat segments and said piston is 120～160 degree.
5. syringe according to claim 3 is characterized in that: said lip cross section comprises near the segmental arc of said piston nose face with away from the flat segments of said piston nose face; The angle of the outer peripheral face of said flat segments and said piston is 120～160 degree.
6. syringe according to claim 1 and 2 is characterized in that: the ante-chamber end face of said overcoat is the consistent taper seat of coning angle with the pressing plate end face of said union joint pressing plate.
7. syringe according to claim 1 and 2 is characterized in that: said union joint rear end is provided with an axial connecting hole, is provided with an internal projecting ring in the connecting hole; Said injection rod head end be provided with one with the outer bulge loop of said internal projecting ring clamping.
8. syringe according to claim 3 is characterized in that: said union joint rear end is provided with an axial connecting hole, is provided with an internal projecting ring in the connecting hole; Said injection rod head end be provided with one with the outer bulge loop of said internal projecting ring clamping.
9. syringe according to claim 4 is characterized in that: said union joint rear end is provided with an axial connecting hole, is provided with an internal projecting ring in the connecting hole; Said injection rod head end be provided with one with the outer bulge loop of said internal projecting ring clamping.
10. syringe according to claim 6 is characterized in that: said union joint rear end is provided with an axial connecting hole, is provided with an internal projecting ring in the connecting hole; Said injection rod head end be provided with one with the outer bulge loop of said internal projecting ring clamping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220128323 CN202605442U (en) | 2012-03-30 | 2012-03-30 | Low resistance syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220128323 CN202605442U (en) | 2012-03-30 | 2012-03-30 | Low resistance syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202605442U true CN202605442U (en) | 2012-12-19 |
Family
ID=47339179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220128323 Expired - Lifetime CN202605442U (en) | 2012-03-30 | 2012-03-30 | Low resistance syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202605442U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104759005A (en) * | 2015-04-21 | 2015-07-08 | 山东淄博山川医用器材有限公司 | Low-resistance injector piston and injector |
| CN104906665A (en) * | 2015-06-05 | 2015-09-16 | 山东新华安得医疗用品有限公司 | Low-resistance injector |
-
2012
- 2012-03-30 CN CN 201220128323 patent/CN202605442U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104759005A (en) * | 2015-04-21 | 2015-07-08 | 山东淄博山川医用器材有限公司 | Low-resistance injector piston and injector |
| CN104906665A (en) * | 2015-06-05 | 2015-09-16 | 山东新华安得医疗用品有限公司 | 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: 311106 No. 1-5 Shunfeng Road 510, Qianjiang Economic Development Zone, Hangzhou City, Zhejiang Province Patentee after: Zhejiang Longde Pharmaceutical Co., Ltd. Address before: 311106 No. 510 Shunfeng Road, Qianjiang Economic Zone, Hangzhou City, Zhejiang Province Patentee before: Hangzhou Longde Medical Instrument Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121219 |