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| <?xml version="1.0" standalone="no" encoding="windows-1252"?> |
| <!-- Generated by ThunderDome Portal - 3/17/2023 7:46:46 PM --> |
| <xsd:schema xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:stpr="http://xbrl.sec.gov/stpr/2021" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:dei="http://xbrl.sec.gov/dei/2021q4" xmlns:country="http://xbrl.sec.gov/country/2021" xmlns:sic="http://xbrl.sec.gov/sic/2021" xmlns:currency="http://xbrl.sec.gov/currency/2021" xmlns:exch="http://xbrl.sec.gov/exch/2021" xmlns:avgr="http://www.avgr.com/20221231" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.avgr.com/20221231"> |
| <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/> |
| <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/> |
| <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/> |
| <xsd:import namespace="http://xbrl.sec.gov/stpr/2021" schemaLocation="https://xbrl.sec.gov/stpr/2021/stpr-2021.xsd"/> |
| <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/> |
| <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/> |
| <xsd:import namespace="http://xbrl.sec.gov/dei/2021q4" schemaLocation="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd"/> |
| <xsd:import namespace="http://xbrl.sec.gov/country/2021" schemaLocation="https://xbrl.sec.gov/country/2021/country-2021.xsd"/> |
| <xsd:import namespace="http://xbrl.sec.gov/sic/2021" schemaLocation="https://xbrl.sec.gov/sic/2021/sic-2021.xsd"/> |
| <xsd:import namespace="http://xbrl.sec.gov/currency/2021" schemaLocation="https://xbrl.sec.gov/currency/2021/currency-2021.xsd"/> |
| <xsd:import namespace="http://xbrl.sec.gov/exch/2021" schemaLocation="https://xbrl.sec.gov/exch/2021/exch-2021.xsd"/> |
| <xsd:annotation> |
| | <xsd:appinfo> |
| | | <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="avgr-20221231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/> |
| | | <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="avgr-20221231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/> |
| | | <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="avgr-20221231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/> |
| | | <link:roleType id="statement-document-and-entity-information" roleURI="http://www.avgr.com/20221231/role/statement-document-and-entity-information"> |
| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 000 - Document - Document And Entity Information </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| </link:roleType> |
| | | </xsd:appinfo> |
| | </xsd:annotation> |
| <xsd:element abstract="true" id="avgr_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| </xsd:schema> |
