WO2005052959A3 - Polymer compositions exhibiting a ptc property and method of fabrication - Google Patents

Polymer compositions exhibiting a ptc property and method of fabrication Download PDF

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Publication number
WO2005052959A3
WO2005052959A3 PCT/US2004/039251 US2004039251W WO2005052959A3 WO 2005052959 A3 WO2005052959 A3 WO 2005052959A3 US 2004039251 W US2004039251 W US 2004039251W WO 2005052959 A3 WO2005052959 A3 WO 2005052959A3
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WO
WIPO (PCT)
Prior art keywords
thermal conductivity
conductive
low
less
fabrication
Prior art date
Application number
PCT/US2004/039251
Other languages
French (fr)
Other versions
WO2005052959A2 (en
Inventor
Csaba Truckai
John H Shadduck
Original Assignee
Surgrx Inc
Csaba Truckai
John H Shadduck
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
Application filed by Surgrx Inc, Csaba Truckai, John H Shadduck filed Critical Surgrx Inc
Publication of WO2005052959A2 publication Critical patent/WO2005052959A2/en
Publication of WO2005052959A3 publication Critical patent/WO2005052959A3/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/146—Conductive polymers, e.g. polyethylene, thermoplastics
    • 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
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient

Abstract

Polymeric compositions including PTC composites (99) that exhibit highly non-linear PTC effects together with extremely rapid, repeatable switching within a predetermined temperature range. In one embodiment, the polymer composite includes a polymer base material (102) with dispersed conductive particles that have very low densities and very low thermal conductivity properties. The conductive particles component can include hollow glass microsphere to provide low mass and low thermal conductivity properties together with a nanoscale conductive gladding or silver or gold. The conductive clad microspheres have a core portion (105) with a bulk density of less than about 2.0g/cm3 and a thermal conductivity of less than about 5.0 W/m-oK.
PCT/US2004/039251 2003-11-19 2004-11-18 Polymer compositions exhibiting a ptc property and method of fabrication WO2005052959A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US52356703P 2003-11-19 2003-11-19
US60/523,567 2003-11-19
US56342404P 2004-04-19 2004-04-19
US60/563,424 2004-04-19

Publications (2)

Publication Number Publication Date
WO2005052959A2 WO2005052959A2 (en) 2005-06-09
WO2005052959A3 true WO2005052959A3 (en) 2006-03-09

Family

ID=34636475

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/039251 WO2005052959A2 (en) 2003-11-19 2004-11-18 Polymer compositions exhibiting a ptc property and method of fabrication

Country Status (2)

Country Link
US (1) US7309849B2 (en)
WO (1) WO2005052959A2 (en)

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