A detachment system for delivering an implantable medical device to a target location of a body vessel, comprising: a generally hollow distal tube comprising: a proximal end ; a distal end ; a compressible portion of the distal tube itself, between the proximal and distal ends which is axially movable from a compressed condition to an elongated condition; and a flexible portion of the distal tube itself, between the proximal end and the compressible portion ; the detachment system further comprising: a generally hollow proximal tube having a proximal end , a distal end , and a flexible portion of the proximal tube itself, between the proximal and distal ends ; and an engagement system configured to engage and deploy the implantable medical device positioned at the distal end of the distal tube ; wherein the engagement system is configured to maintain the compressible portion in the compressed condition when engaging the implantable medical device , and wherein the engagement system is configured to deploy the implantable medical device and release the compressible portion to the elongated condition; the detachment system further comprising: a coupling disposed between the proximal end of the distal tube and the distal end of the proximal tube , joining the proximal and distal tubes ; characterized in that : the proximal tube partially overlaps the coupling , the distal tube partially overlaps the coupling , and a gap which is formed on the coupling between the proximal tube and the distal tube comprises a weld band to weld the coupling to the proximal tube and the distal tube. a proximal end ; a distal end ; a compressible portion of the distal tube itself, between the proximal and distal ends which is axially movable from a compressed condition to an elongated condition; and a flexible portion of the distal tube itself, between the proximal end and the compressible portion ; a generally hollow proximal tube having a proximal end , a distal end , and a flexible portion of the proximal tube itself, between the proximal and distal ends ; and an engagement system configured to engage and deploy the implantable medical device positioned at the distal end of the distal tube ; wherein the engagement system is configured to maintain the compressible portion in the compressed condition when engaging the implantable medical device , and wherein the engagement system is configured to deploy the implantable medical device and release the compressible portion to the elongated condition; a coupling disposed between the proximal end of the distal tube and the distal end of the proximal tube , joining the proximal and distal tubes ; characterized in that : the proximal tube partially overlaps the coupling , the distal tube partially overlaps the coupling , and a gap which is formed on the coupling between the proximal tube and the distal tube comprises a weld band to weld the coupling to the proximal tube and the distal tube. the proximal tube partially overlaps the coupling , the distal tube partially overlaps the coupling , and a gap which is formed on the coupling between the proximal tube and the distal tube comprises a weld band to weld the coupling to the proximal tube and the distal tube. <EOS>