Absorption depletion indicators for anesthetic gas administration systems
First Claim
1. A combination of an indicator and a canister for a closed or semi-closed system of anesthetic gas administration, the cacnister having a carbon dioxide absorbent held therein, the indicator being provided for the canister for determining when the carbon dioxide absorbent is exhausted, the indicator being in the form of at least one wax temperature indicator calibrated permanently to undergo change of colour at a temperature of the absorbent indicative of extensive exhaustion of the absorbent due to carbon dioxide absorption, the absorbent being selected from the group consisting of soda lime and baralyme.
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Abstract
Absorption depletion indicators for anesthetic gas administration systems which, in a closed or semi-closed system of anesthetic gas administration comprising a canister held absorbent for carbon dioxide, the improvement is characterized in that an indicator is provided for the canister for determining when the carbon dioxide absorbent is exhausted, the indicator is in the form of a wax temperature indicator calibrated permanently to change colour at a temperature of the absorbent indicative of exhaustion of the absorbent due to carbon dioxide absorption.
68 Citations
9 Claims
- 1. A combination of an indicator and a canister for a closed or semi-closed system of anesthetic gas administration, the cacnister having a carbon dioxide absorbent held therein, the indicator being provided for the canister for determining when the carbon dioxide absorbent is exhausted, the indicator being in the form of at least one wax temperature indicator calibrated permanently to undergo change of colour at a temperature of the absorbent indicative of extensive exhaustion of the absorbent due to carbon dioxide absorption, the absorbent being selected from the group consisting of soda lime and baralyme.
Specification