Thermodynamic charactristics of Metrum Cryoflex cryoprobes ... · Thermodynamic charactristics of...
Transcript of Thermodynamic charactristics of Metrum Cryoflex cryoprobes ... · Thermodynamic charactristics of...
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Thermodynamic charactristics of Metrum Cryoflex cryoprobes
- in vitro test report Eng. Dawid Guzik
R&D department Metrum CryoFlex
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0,8mm /L:20mm/needle tip 0,8mm /L:20mm/needle tip
different type of cryoablation probes
Freezing tip: 5mm
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1,3/L: 120mm/radius or triangular tip
Freezing tip: 8mm
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2mm/L: 150mm/ triangular tip
Freezing tip: 8mm
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sacroiliac joints 2mm /L: 150mm/ triangular tip
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In vitro analysis method
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Rfe
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Internal coating (warm tube) work principle
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CFD Simulation of internal coating (warmtube) cryoprobe using CO2
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In vitro test result and visualization
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0,8mm /L:20mm/needle tipStart pressure: 63[bar]environment: agar 350C
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Increase of frozen area during the in vitro treatment with 0,8mm needle tip cryoprobe.
1 min 2 min
max 5,5mm max 8mm
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1,3/L: 120mmStart pressure: 50[bar]environment: agar 350C
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1,3/L: 120mm tip type comparisonTriangular Radius
max 6mm max 7mm
max 10mmmax 10mm
After 1 min.
After 2 min.
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Axis direction heat transfer
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3mm in front of 1,3/L: 120mm/Triangular
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2mm/L: 150mmStart pressure: 50[bar]environment: agar 350C
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Increase of frozen area during the in vitro treatment in 2mm/L: 150mm cryoprobe.
1 min 2 min
max 9mm
max 12mm
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Increase of frozen area during the in vitro treatment in sacroiliac joints 2mm /L: 150mm
cryoprobe.
1 min 2min
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Conclusions
• To avoid skin damage using 0,8mm probe, use cannula.
• For axial freezing (nerve in front of probe) use round tip probes
• Using triangular tip probes, the lowest temperatures are on side of probe
• Time of treatment depends on nerve positon against the probe.
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Thank you for attention