GB2314891A - Method and Apparatus for Supplying Liquid Cryogen - Google Patents

Method and Apparatus for Supplying Liquid Cryogen

Info

Publication number
GB2314891A
GB2314891A GB9719801A GB9719801A GB2314891A GB 2314891 A GB2314891 A GB 2314891A GB 9719801 A GB9719801 A GB 9719801A GB 9719801 A GB9719801 A GB 9719801A GB 2314891 A GB2314891 A GB 2314891A
Authority
GB
United Kingdom
Prior art keywords
pressure
controlling
cryogen
liquid cryogen
source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9719801A
Other versions
GB9719801D0 (en
Inventor
Brian Kevin Roderick Clarke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spembly Cryosurgery Ltd
Original Assignee
Spembly Cryosurgery Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9506652.8A external-priority patent/GB9506652D0/en
Application filed by Spembly Cryosurgery Ltd filed Critical Spembly Cryosurgery Ltd
Priority to GB9719801A priority Critical patent/GB2314891A/en
Publication of GB9719801D0 publication Critical patent/GB9719801D0/en
Publication of GB2314891A publication Critical patent/GB2314891A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means
    • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
    • G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
    • G05D7/0676—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on flow sources
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/02—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by cooling, e.g. cryogenic techniques

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

A method and apparatus are described for controlling the rate of supply of a liquid cryogen, for example, for cryosurgical use. The flow rate of the liquid cryogen is controlled by controlling variably the pressure propellant gas acting directly or indirectly on the liquid cryogen. A means for controlling the propellant gas pressure may comprise a source of pressurised propellant gas, and control valve means coupled between the source and the liquid cryogen reservoir chamber for controlling the pressure supplied to the reservoir chamber. A plurality of reservoir chambers may be driven by a common pressure source. When the pressure source is a pressure raising system, the cryogen reservoir chambers may be contained within the vessel of the pressure raising system. A feedback control arrangement is also described for controlling the cryogen flow rate in response to a measured characteristic associated with, or affected by, the cryogen flow rate. For example, in cryosurgery, the measured characteristic may be temperature as measured by a temperature probe.
GB9719801A 1995-03-31 1996-04-01 Method and Apparatus for Supplying Liquid Cryogen Withdrawn GB2314891A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9719801A GB2314891A (en) 1995-03-31 1996-04-01 Method and Apparatus for Supplying Liquid Cryogen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9506652.8A GB9506652D0 (en) 1995-03-31 1995-03-31 Supplying liquid cryogen to cryosurgical apparatus
GB9719801A GB2314891A (en) 1995-03-31 1996-04-01 Method and Apparatus for Supplying Liquid Cryogen
PCT/GB1996/000787 WO1996030816A1 (en) 1995-03-31 1996-04-01 Method and apparatus for supplying liquid cryogen

Publications (2)

Publication Number Publication Date
GB9719801D0 GB9719801D0 (en) 1997-11-19
GB2314891A true GB2314891A (en) 1998-01-14

Family

ID=26306784

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9719801A Withdrawn GB2314891A (en) 1995-03-31 1996-04-01 Method and Apparatus for Supplying Liquid Cryogen

Country Status (1)

Country Link
GB (1) GB2314891A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116199A (en) * 1976-12-06 1978-09-26 Brymill Corporation Cryosurgical instrument reservoir
US4275734A (en) * 1977-08-12 1981-06-30 Valleylab, Inc. Cryosurgical apparatus and method
US4296610A (en) * 1980-04-17 1981-10-27 Union Carbide Corporation Liquid cryogen delivery system
US4946460A (en) * 1989-04-26 1990-08-07 Cryo Instruments, Inc. Apparatus for cryosurgery
US5172558A (en) * 1988-08-04 1992-12-22 Franz Welz Internationale Transporte Gmbh Cooling process and refrigerated container
US5327732A (en) * 1991-10-08 1994-07-12 Fernando Martins da Silva Apparatus for supplying cryogenic fluid, namely nitrogen, to extinguish fires

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116199A (en) * 1976-12-06 1978-09-26 Brymill Corporation Cryosurgical instrument reservoir
US4275734A (en) * 1977-08-12 1981-06-30 Valleylab, Inc. Cryosurgical apparatus and method
US4296610A (en) * 1980-04-17 1981-10-27 Union Carbide Corporation Liquid cryogen delivery system
US5172558A (en) * 1988-08-04 1992-12-22 Franz Welz Internationale Transporte Gmbh Cooling process and refrigerated container
US4946460A (en) * 1989-04-26 1990-08-07 Cryo Instruments, Inc. Apparatus for cryosurgery
US5327732A (en) * 1991-10-08 1994-07-12 Fernando Martins da Silva Apparatus for supplying cryogenic fluid, namely nitrogen, to extinguish fires

Also Published As

Publication number Publication date
GB9719801D0 (en) 1997-11-19

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)