Cardiac output measuring catheter
AssigneeTerumo Kabushiki Kaisha
InventorsAkiko Yoshikoshi, Kouji Tsuchida
Life of this patent
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Abstract
A catheter for measuring a cardiac output includes a catheter tube defining a longitudinal bore therein and having an opening near its distal end, wherein the tube bore is divided into a first lumen for installing therein a thermistor on a proximal side with respect to the opening, a second lumen in communication with the opening, and at least one third lumen. There are provided a first partition separating the first lumen and the third lumen and a second partition separating the second lumen and the third lumen, the first partition being separate from the second partition.
Claims12
A catheter for measuring a cardiac output, comprising:
- a catheter tube having a wall defining a longitudinal bore therein, said catheter tube having a distal end and a proximal end, and an opening near the distal end,
- partition means in said catheter tube for dividing said bore into a first lumen, a second lumen in fluid communication with said opening near the distal end of said catheter tube, and at least one third lumen interposed between said first and second lumens and completely separating said first lumen from said second lumen,
- a distal portion of said at least one third lumen being filled with gas means for providing thermal insulation, and
- temperature sensing means mounted in said first lumen, said temperature sensing means including a temperature sensing element and lead wires connected to said temperature sensing element, said lead wires extending through at least a portion of said first lumen,
- said partition means including:
- a first partition separating said first lumen and said at least one third lumen, and
- a second partition separating said second lumen and said at least one third lumen,
- said first partition being separated from said second partition, and
- said temperature sensing element is disposed on a proximal side of said catheter tube with respect to said opening in said bore of said catheter tube.
A catheter for measuring a cardiac output, comprising:
- a catheter tube having a distal end,
- a first lumen in said catheter tube,
- a temperature sensing element and associated lead wires received in said first lumen,
- a second lumen in said catheter tube and opening at said distal end of said catheter tube,
- a third lumen in said catheter tube and interposed between said first and second lumens to completely separate said first and second lumens from each other and to provide heat insulation between said first and second lumens, and
- a further lumen interposed between said first and second lumens, said further lumen being filled at a distal end portion thereof with gas means for providing thermal insulation between said first and second lumens.
Dependencies are inferred from the claim text.