A catheter device for implanting a medical implant, comprising: - an outer sheath extending along a longitudinal axis (x) of the catheter device and surrounding a lumen of the outer sheath, - an inner sheath extending along the longitudinal axis (x), wherein the inner sheath is arranged in the lumen of the outer sheath and connected to a support element for supporting the medical implant or to a connector, - a capsule connected to a distal end of the outer sheath for covering the medical implant when the medical implant is arranged on the support element or the connector, - a handle comprising: a grip portion for manually holding the handle, a rotatable deployment knob, and a traveler, wherein the outer sheath is connected to the traveler, wherein the deployment knob comprises a helical groove formed in an inside of the deployment knob, wherein the traveler engages into the helical groove of the deployment knob such that the traveler and thereby the outer sheath are moved in a proximal direction along the longitudinal axis (x) with respect to the inner sheath when the deployment knob is rotated in a first rotation direction, so that the capsule is pulled away from the medical implant in the proximal direction to deploy the medical implant, and such that the traveler and thereby the outer sheath are moved in the distal direction along the longitudinal axis (x) with respect to the inner sheath when the deployment knob is rotated in an opposite second rotation direction, so that the capsule is moved over the medical implant to cover the medical implant, wherein the handle comprises a locking element that is configured to be moved from a first to a second state, wherein the locking element limits a movement of the traveler and therewith of the capsule in the distal direction in the first state, and wherein the locking element allows a further movement of the traveler and therewith of the capsule in the distal direction in the second state. - an outer sheath extending along a longitudinal axis (x) of the catheter device and surrounding a lumen of the outer sheath, - an inner sheath extending along the longitudinal axis (x), wherein the inner sheath is arranged in the lumen of the outer sheath and connected to a support element for supporting the medical implant or to a connector, - a capsule connected to a distal end of the outer sheath for covering the medical implant when the medical implant is arranged on the support element or the connector, - a handle comprising: a grip portion for manually holding the handle, a rotatable deployment knob, and a traveler, wherein the outer sheath is connected to the traveler, wherein the deployment knob comprises a helical groove formed in an inside of the deployment knob, wherein the traveler engages into the helical groove of the deployment knob such that the traveler and thereby the outer sheath are moved in a proximal direction along the longitudinal axis (x) with respect to the inner sheath when the deployment knob is rotated in a first rotation direction, so that the capsule is pulled away from the medical implant in the proximal direction to deploy the medical implant, and such that the traveler and thereby the outer sheath are moved in the distal direction along the longitudinal axis (x) with respect to the inner sheath when the deployment knob is rotated in an opposite second rotation direction, so that the capsule is moved over the medical implant to cover the medical implant, wherein the handle comprises a locking element that is configured to be moved from a first to a second state, wherein the locking element limits a movement of the traveler and therewith of the capsule in the distal direction in the first state, and wherein the locking element allows a further movement of the traveler and therewith of the capsule in the distal direction in the second state.