A device-to-lead terminal connector for an implantable medical device is designed to positively lock the proximal lead terminal within a lead bore formed in the connector of the implantable device. Rather than using a conventional setscrew locking arrangement, first and second latching members are insertable through side ports in the device connector that intersect with the lead bore and that contain an elastomeric sleeve. When the latching members are squeezed together, they cooperate to expand the elastomeric sleeve against the proximal lead terminal to press it into intimate electrical and mechanical engagement with a contact in the lead bore of the device connector. The need for a tool to effect locking of the lead terminal in place is dispensed with.