Abstract: A rate-changing implantable heart-stimulating device is disclosed, one that avoids use of moving parts and making unwanted rate changes. The device senses and responds to skeletal myopotential signals derived from the body of the wearer, preferably considering both amplitude and frequency of myopotential voltage signals which exceed a predetermined threshold value. The device preferably has two-way radio communication with an external programmer means.

Abstract: Hemodialysis port assembly including a port and a catheter assembly. The port includes an inlet septum subtended by an inlet plenum and an outlet septum subtended by an outlet plenum. The catheter assembly includes an inlet channel connected to the inlet plenum and an outlet channel connected to the outlet plenum. The port and catheter assembly are completely implanted in the chest of a patient with the port subcutaneous and the end of the catheter assembly remote from the port injected into the subclavian vein. The blood flow in this vein is in the direction away from the end of the catheter assembly. Near this remote end the catheter assembly or the inlet channel terminates in an inlet valve and the outlet channel terminates in an outlet valve. Each of these valves is essentially a flapper on which the blood is incident in a generally perpendicular direction so that its flow is substantially unimpeded.