Automatically blocked safety syringe with greatly unaligned blocking bulb
US5273538A · kind A · utility
Inventor
Key dates
| Filing date | Feb 19, 1993 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Feb 19, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3284
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A safety syringe includes a hollow needle for injection use preliminarily held in a rigid blocking bulb generally conical shaped or truncated-cone shaped having an elongate stem portion protruding rearwardly from the bulb embedded in a rear bulb socket perpendicularly formed in a flexible plug inserted in a front portion of the syringe having a needle head portion formed on a rear portion of the needle, and a plunger slidably held in the syringe for boosting a liquid medicine in the syringe to be injected into a patient through the hollow needle having a needle-head socket recessed in the plunger to be engageable with the needle head portion to drive and move the rigid blocking bulb frontwardly into a front bulb socket which is normally inclinedly formed in the flexible plug and will be operatively biased perpendicularly in the plug when almost exhausting the liquid in the syringe when finishing the injection, whereby upon a retraction of the plunger and the needle coupled to the plunger rearwardly into the syringe, the elongate stem portion of the rigid bulb will be greatly obliquely biased in a larger angle by the front bulb socket of the plug to be much inclinedly positioned for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.