Biological gas sensor
First Claim
1. A biological gas sensor comprising:
- a sensor which has in the sensitive part thereof a bicarbonate buffer solution held by a first gas permeable membrane and detects a carbon dioxide partial pressure based on the hydrogen ion concentration of the bicarbonate buffer solution;
a liquid holding part which has in the inside thereof the sensitive part of said sensor and at least a part of the inner wall of said holding part is made of a second gas permeable membrane;
an aqueous solution which is held in said liquid holding part and is substantially isotonic with said bicarbonate buffer solution; and
a metallic member which is in said liquid holding part and is reactive with hydrogen sulfide.
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Accused Products
Abstract
A biological gas sensor for measuring a carbon dioxide partial pressure in an alimentary canal while excluding the influences of hydrogen sulfide and/or weak acid is disclosed. The gas sensor comprises a sensor which has in the sensitive part thereof a bicarbonate buffer solution held by a gas permeable membrane and detects a carbon dioxide partial pressure based on the hydrogen ion concentration of the bicarbonate buffer solution, a liquid holding part which is formed of a gas permeable tube having in the inside thereof the sensitive part of the sensor, an isotonic solution which is held in the liquid holding part and is isotonic with the bicarbonate buffer solution, and a metallic member (e.g., a coil of copper wire) so that hydrogen sulfide entering the liquid holding part may react with the metal and precipitate.
22 Citations
17 Claims
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1. A biological gas sensor comprising:
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a sensor which has in the sensitive part thereof a bicarbonate buffer solution held by a first gas permeable membrane and detects a carbon dioxide partial pressure based on the hydrogen ion concentration of the bicarbonate buffer solution; a liquid holding part which has in the inside thereof the sensitive part of said sensor and at least a part of the inner wall of said holding part is made of a second gas permeable membrane; an aqueous solution which is held in said liquid holding part and is substantially isotonic with said bicarbonate buffer solution; and a metallic member which is in said liquid holding part and is reactive with hydrogen sulfide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A biological gas sensor comprising:
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a sensor which has in the sensitive part thereof a bicarbonate buffer solution held by a first gas permeable membrane and detects a carbon dioxide partial pressure based on the hydrogen ion concentration of the bicarbonate buffer solution; a liquid holding part which has in the inside thereof the sensitive part of said sensor and at least a part of the inner wall of said holding part is made of a second gas permeable membrane; and an aqueous solution which is held in said liquid holding part, is substantially isotonic with said bicarbonate buffer solution, and contains a metallic ion or a metallic compound capable of reacting with hydrogen sulfide. - View Dependent Claims (10)
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11. A biological gas sensor comprising:
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a sensor which has in the sensitive part thereof a bicarbonate buffer solution held by a first gas permeable membrane and detects a carbon dioxide partial pressure based on the hydrogen ion concentration of the bicarbonate buffer solution; a liquid holding part which has in the inside thereof the sensitive part of said sensor and at least a part of the inner wall of said holding part is made of a second gas permeable membrane containing powder of a metal or a compound thereof capable of reacting with hydrogen sulfide; and an aqueous solution which is contained in said liquid holding part and is substantially isotonic with said bicarbonate buffer solution. - View Dependent Claims (12)
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13. A biological gas sensor comprising:
a sensor which has in the sensitive part thereof a bicarbonate buffer solution held by a first gas permeable membrane and detects a carbon dioxide partial pressure based on the hydrogen ion concentration of the bicarbonate buffer solution, wherein said gas permeable membrane contains powder of a metal or a compound thereof capable of reacting with hydrogen sulfide. - View Dependent Claims (14)
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15. A biological gas sensor comprising:
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a sensor which has in the sensitive part thereof a bicarbonate buffer solution held by a first gas permeable membrane and detects a carbon dioxide partial pressure based on the hydrogen ion concentration of the bicarbonate buffer solution; a liquid holding part which has in the inside thereof the sensitive part of said sensor and at least a part of the inner wall of said holding part is made of a second gas permeable membrane; and an aqueous alkaline solution which is contained in said liquid holding part and is substantially isotonic with said bicarbonate buffer solution. - View Dependent Claims (16, 17)
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Specification