Check valve for blood drawing apparatus
US4244379A · kind A · utility
51Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1979 |
| Grant date | Jan 13, 1981 |
| Priority date | — |
| Expiry date | Aug 2, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7881
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A check valve is disclosed for use in blood drawing apparatus wherein it is desired to draw multiple samples from a single needle inserted into a patient's arm for use in a variety of medical tests. The check valve includes therein a valve member formed of a piece of a silicone elastomer which has a slit formed therein, the slit opening only when fluid pressure is greater in the patient than in the vessel into which the blood is being drawn. The check valve is of particularly small size so that it may be mounted within a conventionally sized double-needle fitting normally used in blood drawing apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.