Wood treatment apparatus with a displaceable sleeve for treating wood and method for treating wood

A wood-treatment apparatus configured for a long-term treatment of wood, wherein the long-term treatment is defined as lasting several days to several months, the wood-treatment apparatus comprising:

• a cylindrical hollow body comprising:
• an inner end that, in a position of use of the wood-treatment apparatus, is located within the wood;
• an outer end facing away from the inner end;
• a cylindrical wall surface comprising at least one exit opening;
• and an accommodating space surrounded by the cylindrical wall surface and accommodating a carrier material with an active wood-treatment substance active against tree diseases or tree infestations;
• a sleeve arranged circumferentially around the cylindrical hollow body, wherein the sleeve closes off the at least one exit opening of the cylindrical wall surface in a state of non-use of the wood-treatment apparatus;
• wherein the sleeve is displaceable or compressible such that, when the wood-treatment apparatus is inserted or driven into the wood to position the at least one exit opening in or near a site to be treated in the position of use of the wood-treatment apparatus, the sleeve is retained by the surrounding wood and displaced axially along the cylindrical hollow body toward the outer end or axially compressed;
• wherein the sleeve, by being displaced or compressed, opens the at least one exit opening in a direction from the inner end toward the outer end and the at least one exit opening provides an open connection between the accommodating space and the wood;
• wherein, via the open connection, the active wood-treatment substance active against tree diseases or tree infestations passes pressureless into the wood by capillary action and/or by diffusion.