Method of evacuating and preserving a blood collecting device
US4936314A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1988 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Dec 9, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/155
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An evacuated blood collecting device for collecting a blood sample of predetermined volume comprises: a cylindrical member having one open end and one closed end; a puncturable stopper member closing tightly the open end of the cylindrical member so as to seal the space within said cylindrical member; and a gas sealed in the space within the cylindrical member. The cylindrical member and the stopper member are made of materials having a characteristic such that the permeation coefficient of the gas sealed inside the space to at least one of the cylindrical member and stopper member is higher than that of the gas around the outside of the blood collecting device, whereby the interior of the space is retained under reduced pressure relative to the gas around the outside of the blood collecting device in proportion to the blood sampling volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.