US 2003/0199804 A1 · Anesthetic filter arrangement

Abstract

An anesthetic filter arrangement for the reflection of unused anesthetic agent in expiration gas back toward a patient has a filter housing having an interior portion arranged to provide an internal gas flow path for an inspiration gas and for an expiration gas passing alternately and in opposite directions through the housing and a filter element disposed in gas communication with the interior portion for adsorption of anesthetic agent from the expiration gas and subsequent desorption of the anesthetic agent into the inspiration gas. The arrangement further. has a thermal regulator operable to reduce thermal energy at the filter element by cooling one or both incoming gas and the filter element, and thereby vary one or both the adsorption and the desorption of the anesthetic agent.

Claims7

Dependent claims

An anesthetic filter arrangement comprising:

a filter housing having an interior containing an internal gas flow path for an inspiration gas and an expiration gas, containing an anesthetic agent, passing through said filter housing;
a filter element in said filter housing disposed in gaseous communication with said interior portion for adsorbing said anesthetic agent from the expiration gas and subsequently desorbing said anesthetic agent into said inspiration gas, said filter element having a thermal energy associated therewith;
and
a thermal regulator in thermal communication with said filter element for decreasing said thermal energy at said filter element to vary at least one of the adsorption and desorption of said anesthetic agent.

1 more element

Dependencies are inferred from the claim text.

Anesthetic filter arrangement

Life of this patent

Anesthetic filter arrangement

Life of this patent

Abstract

Claims7