Needle for use with vacuum test tube blood sampling systems
US5133362A · kind A · utility
15Cited by
13References
3Claims
0Family size
Inventor
Key dates
| Filing date | Dec 28, 1990 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Dec 28, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/32
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In a double needle the blood withdrawal system the front needle for accomplishing the vena puncture is between 23 gauge and 29 gauge while the rear needle which resides in the syringe barrel and is used to puncture the stopper is similar to those standardly used between 12 and 16 gauge. The smaller gauge front needle acts as a flow restricter to prevent the initial blood sample drawn into the vacuum tube from impacting on the bottom wall of the tube thereby creating hemolysis of some of the red cells. The length of the front needle is between 0.5 and 1.5 inches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.