A connector assembly includes a connector body with an elongated shape and a longitudinal axis. The connector body defines a port at a first end configured to receive a proximal portion of a lead or lead extension. Contact assemblies are axially spaced-apart within the connector body and collectively form a lumen that extends from the port along the longitudinal axis of the connector body. Each contact assembly includes a spring contact disposed within a contact housing. The spring contact has a contact region that extends diagonally with respect to the longitudinal axis of the connector body. The contact region is positioned within the contact housing so that insertion of the proximal portion of the lead or lead extension into the contact housing results in a bending deflection of the contact region of the spring contact while maintaining contact between the contact region and the lead or lead extension.