Fixation Sleeve and Assembly Comprising Such Sleeve

A fixation sleeve for an implantable lead with a lead body, wherein the fixation sleeve has a substantially tubular shape comprising an internal lumen extending therethrough and extending in a longitudinal direction, wherein the fixation sleeve comprises a tubular mesh configured such that an internal mesh lumen forms a section of the internal lumen of the fixation sleeve wherein the internal mesh lumen is configured to receive the lead body, wherein the fixation sleeve comprises a first tubular component and a second tubular component, wherein the first tubular component is fixedly attached to a first longitudinal end of the tubular mesh and the second tubular component is fixedly attached to a second longitudinal end opposite the first longitudinal end of the tubular mesh via a spring component wherein the first tubular component and/or the second tubular component being displaceable in longitudinal direction relative to each other from a first relative position to a second relative position thereby extending the tubular mesh in longitudinal direction from a first length to a greater second length such that the inner diameter of the internal mesh lumen is correspondingly reduced, wherein in the first relative position a longitudinal movement of the lead body within the internal mesh lumen is allowed and in the second relative position a longitudinal movement of the lead body is prevented.