Impedance-based method and apparatus for monitoring cryodestruction in controlled cryosurgery
US4140109A · kind A · utility
77Cited by
4References
13Claims
0Family size
Inventors
Key dates
| Filing date | Oct 17, 1977 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Oct 17, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/00026
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An impedance-based method for the controlled cryosurgery of a patient's malignant tumor consisting of the steps: placing a contact electrode electrically connected to an impedance meter in electric contact with a body site spaced away from the tumor target, inserting a needle electrode electrically connected to the impedance meter through the tumor target with the tip of the needle electrode penetrating the immediately underlying normal tissue therebelow, and monitoring during cryosurgery the impedance between the two electrodes as a reflection of the eutectic state of the tissue circumadjacent the tip of the needle electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.