Cryosurgical instrument
US4018227A · kind A · utility
123Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 9, 1975 |
| Grant date | Apr 19, 1977 |
| Priority date | — |
| Expiry date | Oct 9, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2018/00041
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A cryosurgical instrument having a purge cycle of indeterminate duration, separate and apart from its cooling and warming modes, which can be conducted with a refrigerant consisting of a low pressure unsaturated or saturated gas. During the purge cycle, the pressure of the refrigerant gas is regulated to a level below that which is required to effect a Joule-Thomson expansion of the gas upon its entrance into an expansion chamber adjacent the tip of the instrument while simultaneously exhausting the effluent to the atmosphere through an exhaust valve actuated by a footswitch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.