Blood collection assembly with unidirectional flow valve
US4349035A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1980 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Jun 19, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/150473
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A blood collection assembly for receiving a blood sample from a patient but for preventing the blood from flowing out once it has been received. This assembly includes an evacuated receptacle, such as a blood collecting tube, for the reception and retention of a sample of blood. An opening is included in the receptacle into which a penetrable stopper is sealably positioned to maintain the evacuated condition inside the receptacle. Located inside the evacuated receptacle is a unidirectional flow valve through which blood entering the receptacle must pass. When the stopper is penetrated by a sharp cannular instrument carrying blood the pressure on the side of the valve facing the stopper is greater than the pressure in the evacuated receptacle, thereby causing the valve to open so that blood flowing from the instrument flows through the valve and into the receptacle. If the pressure in the receptacle changes so that it is greater than the pressure on the other side of the valve, the valve is operable to close to thereby prevent blood from backflowing into the patient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.