Passive ultrasound needle probe locator
US4428379A · kind A · utility
46Cited by
12References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1982 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Jan 7, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/3413
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A solid steel stylette is carried coaxially within a hollow biopsy needle, with the void therebetween filled and packed with several layers of hollow plastic microspheres having an approximate diameter of 0.80 millimeters. Ultrasound energy impinging on the needle tip is converted to pressure waves which are conveyed back up the stylette, there to be converted to electrical energy for coordination with the image of the system. The packing of hollow plastic microspheres acoustically insulates the stylette from the needle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.