<p>The guide has a body (1) including a distal end provided with a deformable bump (10) or an endpiece presenting a three-dimensional asymmetric shape around a revolution axis of the body. The bump or the endpiece is detachable from the body of the guide. Release systems are arranged in a manner to release the bump or the endpiece with respect to the body. Maximal diameter (theta2) of the bump or endpiece is higher than diameter (theta1) of the body.</p>
