CN2737373Y - Piston for medical injector - Google Patents
Piston for medical injector Download PDFInfo
- Publication number
- CN2737373Y CN2737373Y CN 200420110050 CN200420110050U CN2737373Y CN 2737373 Y CN2737373 Y CN 2737373Y CN 200420110050 CN200420110050 CN 200420110050 CN 200420110050 U CN200420110050 U CN 200420110050U CN 2737373 Y CN2737373 Y CN 2737373Y
- Authority
- CN
- China
- Prior art keywords
- piston
- utility
- model
- medical injector
- injector
- 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.)
- Expired - Fee Related
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The utility model provides a piston for a medical injector. The piston for a medical injector is characterized in that the ratio of the height of the piston and the outer diameter of the piston is within the scope of 40 percent-60 percent. The piston adopts natural or synthetic rubber compositions to make. Adopting the solution for the technical problem, the utility model decreases the contact area of the piston and a casing by decreasing the height of the piston, that is a short piston is used. Thereby, frictional force produced between the piston and the casing when a core rod is pushed and pulled is decreased; thrust is decreased in a use process; the piston for a medical injector is suitable for using, and meanwhile, the push rod can be effectively prevented from falling off; in addition, the utility model has the advantages of beautiful shape, small volume, and raw materials saving.
Description
Technical field
This utility model relates to a kind of piston of injector for medical purpose.
Background technology
As shown in Figure 1, existing injector for medical purpose comprises overcoat 1, piston 3 and core bar 2, and piston 3 cooperates with overcoat 1, and is enclosed within the top of core bar 2.Usually for piston bush is not broken away from the core bar top, and the contact site of piston and overcoat more seals, and the height of piston and the ratio of its external diameter are general more than 70%, also are that the height of piston is higher relatively.Cause the contact area of piston and overcoat bigger like this, during injection, push away, draw core bar can produce bigger friction, make piston break away from core bar when the core bar of especially pulling back is in negative pressure state easily.In addition, it is too fat to move not attractive in appearance that the piston of this structure seems, and need to consume bigger raw material.
The utility model content
The purpose of this utility model is to provide a kind of injector for medical purpose piston of optimizing structure, and it not only combines with core bar closely, difficult drop-off, and save raw material.
The piston of a kind of injector for medical purpose provided by the utility model is characterized in that: the ratio of this depth pistion and its external diameter is in 40%～60% scope.
The piston of above-mentioned injector for medical purpose, wherein, piston is that employing is natural or the synthetic rubber synthetic is made.
Adopted above-mentioned technical solution, this utility model is by reducing the height of piston, also promptly use short piston, reduce the contact area of piston and overcoat, thereby reduce the piston that pushes away, produced when drawing core bar and the friction between the overcoat, be reduced in the thrust of use, it is more suitable to use, and can effectively prevent coming off of throw-out lever again simultaneously.In addition, this utility model profile is attractive in appearance relatively, and volume also greatly reduces, and has saved raw material.
Description of drawings
Fig. 1 is the structural representation of general syringe;
Fig. 2 is a result schematic diagram of the present utility model.
The specific embodiment
As shown in Figure 2, this utility model, i.e. a kind of piston 4 of injector for medical purpose, the height of this piston 4 and the ratio of its external diameter are generally 50% in 40%～60% scope.Piston can adopt high-quality natural or synthetic rubber synthetic to make.
Above embodiment is only for the usefulness that this utility model is described, but not to restriction of the present utility model, person skilled in the relevant technique, under the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or variation, therefore, all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.
Claims (2)
1. the piston of an injector for medical purpose, it is characterized in that: the ratio of this depth pistion and its external diameter is in 40%～60% scope.
2. the piston of a kind of injector for medical purpose according to claim 1 is characterized in that: described piston is to adopt natural or the synthetic rubber synthetic is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420110050 CN2737373Y (en) | 2004-11-19 | 2004-11-19 | Piston for medical injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420110050 CN2737373Y (en) | 2004-11-19 | 2004-11-19 | Piston for medical injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2737373Y true CN2737373Y (en) | 2005-11-02 |
Family
ID=35347288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420110050 Expired - Fee Related CN2737373Y (en) | 2004-11-19 | 2004-11-19 | Piston for medical injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2737373Y (en) |
-
2004
- 2004-11-19 CN CN 200420110050 patent/CN2737373Y/en not_active Expired - Fee Related
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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: 20051102 Termination date: 20091221 |