Syringe plunger snap-on pull ring
US4217896A · kind A · utility
Inventor
Key dates
| Filing date | Dec 19, 1978 |
| Grant date | Aug 19, 1980 |
| Priority date | — |
| Expiry date | Dec 19, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3112
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A ring-type body is provided comprising a plurality of closed continuous convolutions of wire and one end portion of the wire, of an angular extent somewhat less than 360 degrees, includes a slightly greater radius of curvature whereby it is spaced outwardly of the adjacent convolutions. The end portion terminates in a smoothly curved back turned portion defining a U-shaped seat structure for embracingly receiving the free end portion of the plunger of a syringe structure immediately inwardly of the diametrically enlarged terminal end flange thereof, the flange of the syringe plunger being clamped between the U-shaped seat structure and the opposing outer surface portions of the adjacent convolutions. The entire ring-type body including the integral wire portion defining the aforementioned U-shaped seat is constructed from a single length of wire material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.