how to get the sketch of a cut-extrude

Hello, I write this code but I don´t know how to get the sketch of a feature swfeat_op???

Thnak´s

Dim swApp                       As SldWorks.SldWorks
Dim swmodel                     As ModelDoc2
Dim swfeat                      As Feature
Dim swfeat_op                   As Feature
Dim swSubFeat                   As SldWorks.Feature
Dim swfeatMgr                   As FeatureManager
Dim ext As IExtrudeFeatureData2
Sub main()
Set swApp = Application.SldWorks
Set swmodel = swApp.ActiveDoc
Set swfeat = swmodel.FirstFeature
While Not swfeat Is Nothing
Debug.Print "Nombre del Feat:  "; swfeat.Name
Debug.Print "Tipo de Feat:  "; swfeat.GetTypeName2
'===================
'SI EL FEAT ES DEL TIPO CORTAR EXTRUIR OBETENER PARAMETROS DE LA OPERACION Y LUEGO DEL CROQUIS
If swfeat.GetTypeName2 = "ICE" Then
Set swfeat_op = swfeat
Set ext = swfeat_op.GetDefinition
Profundidad = ext.GetDepth(True) * 1000
Debug.Print "Profundidad:"; Profundidad
'get the sketch of this feature ¿?¿?¿¿?¿?¿?¿
'¿¿?¿?¿?¿?¿?¿?¿
End If
Set swfeat = swfeat.GetNextFeature
Wend
End Sub
SolidworksApi macros