Sealing arrangement for heart pacer electrode leads

In combination, a lead assembly and an implantable pulse generator forming a cardiac pacer apparatus:

• a. said lead assembly comprising an elongated generally tubular lead having a conductive element disposed therewithin, with electrode means coupled to said conductive element and disposed at the distal end of said lead assembly, and electrical and mechanical connector means at the proximate end thereof for coupling said lead assembly to said pulse generator;
• b. said pulse generator comprising an enclosure having a bore formed therewithin for receiving said connector means in sealed relationship within said bore, connector block means disposed within said bore for securing the proximal end of said conductive element to said pulse generator and sealing means disposed about the periphery of said lead assembly at a point adjacent said proximal end and normally disposed within said bore when said lead is coupled to said connector means;
• c. said sealing means including a generally closed cylindrical resilient segment arranged generally coaxially of said conductive element with a resilient peripheral sleeve extending outwardly of said cylindrical segment and with a first raised resilient ring disposed about the periphery of said cylindrical segment and disposed between the base of said cylindrical segment at the proximal end thereof and the proximal end of said peripheral sleeve and with a second raised resilient ring extending continuously about the outer periphery of said peripheral sleeve, said resilient peripheral sleeve having axially extending portions arranged in oppositely disposed relationship of said second raised resilient ring;
• and
• d. a rigid terminal pin member disposed generally coaxially thereof, with one end of said pin being lockingly received within a bore formed in said connector block means and with the other end of said rigid terminal pin being spaced axially inwardly of said resilient peripheral sleeve and outwardly of said first raised resilient ring.