Medical device shafts, components, assemblies, and related methods of manufacturing and/or assembling to prevent leaks

A medical device, comprising:

• a handle, wherein the handle includes a port, and wherein the port includes a port lumen;
• a coupling assembly including a ring and a connector;
• wherein the ring includes a distal ledge, a proximal ledge, a plurality of arms, and a proximal surface, and wherein the proximal surface of the ring is coupled to a distal portion of the port;
• wherein the connector includes a connector ring, and a plurality of fingers each including a raised ledge and a plurality of stop surfaces;
• and
• wherein, when the connector is coupled to the ring, the plurality of fingers is positioned radially inward along the proximal ledge such that the proximal ledge reaches stop surfaces of each of the plurality of fingers and the raised ledge engages with a surface of the proximal ledge of the ring to form the coupling assembly.

A medical device, comprising:

• a handle, wherein the handle includes a port, and wherein the port includes a port lumen;
• a shaft extending from a portion of the handle, wherein a first portion of the shaft includes a plurality of first lumens and a second lumen, and wherein a second portion of the shaft only includes the second lumen;
• a hypotube, wherein a proximal portion of the hypotube is positioned within a distal portion of the port, wherein a distal portion of the hypotube is positioned within a proximal portion of the second lumen of the shaft;
• a coupling assembly including at least one outer crimping tube and an outer tube;
• wherein the outer tube is positioned on a radially outer surface of a portion of the second portion of the shaft;
• and
• wherein the outer crimping tube is positioned on the outer tube and the outer crimping tube and the outer tube form a seal between the second portion of the shaft and the port to fluidly connect the second lumen to the port lumen.