A cardiac valved-stent delivery system comprising: a delivery catheter; and a collapsible valved stent; wherein the collapsible valved stent comprises a valve component and a stent component, wherein the stent component comprising a ventricular portion including a lower crown that diverges towards a ventricular end of the stent component, and an aortic portion comprising an upper crown that diverges towards an aortic end of the stent component, and a plurality of stabilization arches having apexes at the aortic end of the stent component, the ventricular portion being configured, in use, for fitting towards a ventricle, and the aortic portion being configured in use, for fitting towards an aorta; wherein the delivery catheter comprises: an attachment region for the collapsible valved stent, wherein the attachment region comprises a distal end and a proximal end; a distal sheath that is slidably configured to cover at least a portion of the distal end of the attachment region and configured to slide distally to reveal the distal end of the attachment region; a proximal sheath that is slidably configured to cover at least a portion of the proximal end of the attachment region and to slide proximally to reveal the proximal end of the attachment region; wherein the distal sheath extends proximally to be capable of covering the ventricular portion of the stent, and at least a part of the upper crown. a delivery catheter; and a collapsible valved stent; wherein the collapsible valved stent comprises a valve component and a stent component, wherein the stent component comprising a ventricular portion including a lower crown that diverges towards a ventricular end of the stent component, and an aortic portion comprising an upper crown that diverges towards an aortic end of the stent component, and a plurality of stabilization arches having apexes at the aortic end of the stent component, the ventricular portion being configured, in use, for fitting towards a ventricle, and the aortic portion being configured in use, for fitting towards an aorta; wherein the delivery catheter comprises: an attachment region for the collapsible valved stent, wherein the attachment region comprises a distal end and a proximal end; a distal sheath that is slidably configured to cover at least a portion of the distal end of the attachment region and configured to slide distally to reveal the distal end of the attachment region; a proximal sheath that is slidably configured to cover at least a portion of the proximal end of the attachment region and to slide proximally to reveal the proximal end of the attachment region; wherein the distal sheath extends proximally to be capable of covering the ventricular portion of the stent, and at least a part of the upper crown. an attachment region for the collapsible valved stent, wherein the attachment region comprises a distal end and a proximal end; a distal sheath that is slidably configured to cover at least a portion of the distal end of the attachment region and configured to slide distally to reveal the distal end of the attachment region; a proximal sheath that is slidably configured to cover at least a portion of the proximal end of the attachment region and to slide proximally to reveal the proximal end of the attachment region; wherein the distal sheath extends proximally to be capable of covering the ventricular portion of the stent, and at least a part of the upper crown.