Title:
METHOD AND APPARATUS FOR SUPPLYING REFRIGERANT FLUID
Document Type and Number:
WIPO Patent Application WO2005038357
Kind Code:
A3
Abstract:
An apparatus is disclosed for supplying a refrigerant fluid to a cooling device, such as a cryosurgical probe. An arrangement of valves may control the supply of fluid to and from the cooling device. Fluid may flow in a forward direction through the cooling device for generating cooling by expansion of the fluid in the cooling device. The apparatus may execute a programmed sequence of cooling and heating cycles automatically. Backflushing of the fluid may be used for clearing contaminants from the inlet side of the cooling device. A pulse width modulated control signal may be used to control one of the valves to have a variable effective aperture. A flow rate sensor may detect the flow rate through the cooling device. The detected flow rate may be used to detect an occurrence of a blockage and/or for controlling the fluid supplied to the cooling device. A blockage may be cleared by automatic backflushing.
Inventors:
COPPING GARETH (GB)
Application Number:
PCT/IB2004/003401
Publication Date:
March 23, 2006
Filing Date:
October 18, 2004
Export Citation:
Assignee:
CRYOMED GROUP LTD (GB)
HOLMES MILES (FR)
COPPING GARETH (GB)
HOLMES MILES (FR)
COPPING GARETH (GB)
International Classes:
A61B18/02; F25B9/02; (IPC1-7): F25B9/02; A61B18/02
Foreign References:
| US3913581A | 1975-10-21 | |||
| US3782386A | 1974-01-01 | |||
| US3299662A | 1967-01-24 |
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