Disposable injection syringe
US5037394A · kind A · utility
Inventors
Key dates
| Filing date | Dec 21, 1990 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Dec 21, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/5033
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention relates to medical engineering. A disposable injection syringe comprises a cylindrical body (1) accommodating a piston (2) with a rod (3). The rod (3) is of a shaped design and appears as a plurality cone frustums (7) arranged in series lengthwise the rod; a shaped hollow insert (8) is arranged concentrically to the rod, which insert is composed of two parts (8a,8b) and whose inner surface follows the outer surface of the rod (3), while its outer surface is formed by the surfaces of a plurality of cone frustums (9). A washer (10) is interposed between the piston (2) and the insert (8) concentrically to the rod (3), the side face of the washer being bevelled, while a collar (11) is provided on the inner surface of the body (1), one of the collar surfaces being bevelled so as to suit the bevelled surface of the washer (10). The disposable injection syringe is applicable at any medical institutions and for individual use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.