Tether assemblies for medical device delivery systems

A method comprising:

• retracting a distal portion of an inner retainer of a tether head assembly from within a passageway of the tether head assembly via a pull wire separate from and coupled to the inner retainer, wherein the tether head assembly comprises:
• the inner retainer, and
• an outer retainer, wherein the outer retainer defines an aperture, the aperture comprising:
• a receptacle configured to receive the attachment member, and
• the passageway extending from a distal end of the tether head assembly proximally to the receptacle;
• inserting an attachment member of a medical device through the passageway and into the receptacle, wherein the medical device comprises:
• a housing defining a proximal end and a distal end of the medical device, and a housing width along a direction orthogonal to a longitudinal axis of the medical device,
• a shroud structure disposed at the proximal end of the medical device and defining a cavity and a shroud width which is narrower than the housing width, and
• the attachment member disposed within the cavity;
• and
• advancing the inner retainer at least partially into the passageway to inhibit movement of the attachment member out of the receptacle via the passageway.

A medical device comprising:

• a housing extending along a longitudinal axis and defining a proximal end and a distal end of the medical device, and a housing width along a direction orthogonal to the longitudinal axis;
• a shroud structure disposed at the proximal end of the medical device and defining a cavity and a shroud width, the shroud width being narrower than the housing width;
• and
• an attachment member disposed within the cavity, wherein the attachment member defines an elongate holding surface spaced apart from the proximal end, and wherein the elongate holding surface extends along a length orthogonal to the longitudinal axis,
• wherein the attachment member is configured to be disposed within a receptacle within a tether head assembly to affix the medical device to the tether head assembly, and wherein when the attachment member is disposed within the receptacle, the shroud structure is configured to interface with the tether head assembly to inhibit relative motion between the medical device and the tether head assembly.