A thermodilution catheter having a safe, flexible heating...

Details A thermodilution catheter having a safe, flexible heating... A thermodilution catheter having a safe, flexible heating...

A - Human Necessities

61

B

A61B 5/026 (2006.01) A61B 5/028 (2006.01) H05B 3/58 (2006.01)

Patent

CA 2129551

A thermodilution catheter (100) having a heating filament (400) which is fabricated so as to be thin and flexible enough to avoid contact with the patient's blood. The heating filament is either inserted in a preformed catheter lumen, incorporated into a wall of the catheter body itself, or wrapped around the catheter body wall and surrounded by an external sheath (404). Generally, the covering of the heating filament is minimally thin so as to allow the heat from the heating filament (400) to be transferred to the surrounding blood and to minimally increase the overal cross-sectional area. Since the heating filament (400) does not directly touch the patient's blood, the outer surface may he made smooth so as to prevent inducement of blood clots. In addition, the heat- ing filament (400) maybe maintained at a safe temperature by forming the heating element of a flexible material having a high temperature coefficient of resistance, law thermal capacitance and high thermal conductivity.

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