Delivery device for a replacement heart valve implant

A delivery device for delivering a replacement heart valve implant to a native heart valve, comprising:

• a handle assembly and an elongate shaft assembly extending distally from the handle assembly, wherein the handle assembly comprises:
• a first rotatable knob configured to rotate around a central longitudinal axis of the handle assembly;
• an actuation mechanism operatively engaged with the first rotatable knob;
• a distal shell portion disposed radially outward of the actuation mechanism;
• and
• a plurality of friction elements engaged with the actuation mechanism and the distal shell portion;
• wherein the first rotatable knob is configured to rotate the actuation mechanism relative to the distal shell portion to axially translate a portion of the elongate shaft assembly along the central longitudinal axis;
• wherein a first amount of torque applied to the first rotatable knob is required to rotate the actuation mechanism relative to the distal shell portion in a first rotational direction, and a second amount of torque applied to the first rotatable knob greater than the first amount of torque applied to the first rotatable knob is required to rotate the actuation mechanism relative to the distal shell portion in a second rotational direction.

A delivery device for delivering a replacement heart valve implant to a native heart valve, comprising:

• a handle assembly and an elongate shaft assembly extending distally from the handle assembly, wherein the handle assembly comprises:
• a first rotatable knob configured to rotate around a central longitudinal axis of the handle assembly;
• an actuation mechanism operatively engaged with the first rotatable knob;
• a distal shell portion disposed radially outward of the actuation mechanism;
• and
• a friction element disposed within a longitudinal slot formed in an outer surface of the actuation mechanism, wherein the friction element is engaged in compression between the actuation mechanism and the distal shell portion;
• wherein the first rotatable knob is configured to rotate the actuation mechanism relative to the distal shell portion to axially translate a first portion of the elongate shaft assembly along the central longitudinal axis;
• wherein the friction element is engaged between the actuation mechanism and the distal shell portion in a first amount of compression when the actuation mechanism is rotated relative to the distal shell portion in a first rotational direction, and the friction element is engaged between the actuation mechanism and the distal shell portion in a second amount of compression greater than the first amount of compression when the actuation mechanism is rotated relative to the distal shell portion in a second rotational direction.