Data Sciences, Inc.

Cardiac Pacemakers, Inc.

Brian P Brockway

Perry A Mills

Robert D Dreher

Daniel E Huntwork

Brock S Lindstedt

Douglas C Morrison

Jonathan T Miller

Measurement of a physiological pressure is accomplished by placement of a pressure transmitting catheter within a blood vessel or other structure within which pressure is to be measured. The catheter is blood-compatible, capable of withstanding handling during distribution and implantation, and provides adequate pressure transmission frequency response in a variety of applications. The catheter, which includes a hollow flexible tube filled with a low viscosity fluid and having a plug of a gel-like material at its distal end, transmits the pressure signal to a solid-state transducer which is typically connected to amplifying electronics and an implantable radio-transmitter capable of relaying the pressure information from within the body to a radio receiver located external to the body.

Device for chronic measurement of internal body pressure

A device capable of sensing pressure allows the sensor and amplifying electronics to be packaged in a very small size and implanted within the body. The sensor consists of a small catheter, the tip of which is placed at the point at which pressure is to be measured, attached to a solid-state pressure sensor. The catheter is filled with a fluid and is connected to an implantable infusion pump which dispenses through the lumen of the catheter, heparin or other drug which inhibits thrombogenisis.

Device and method for chronic in-vivo measurement of internal body

A programmable cardiac pacemaker that is selectively programmable via a radio frequency communications link into one of a plurality of a single and dual chamber pacing modes. Depending upon the mode selected, an associated plurality of pacing parameters may be programmed, each within a predetermined range of possible magnitudes. The pacemaker includes a rate smoothing function for preventing the rate interval from changing by more than a predetermined percentage on a cycle-to-cycle basis; and a graceful degradation function for causing the ventricular pacing rate to decay when the atrial rate exceeds a programmed upper rate limit for a predetermined length of time. A graceful degration onset time and rate of decay are also programmable. Additionally, the pacemaker contains a set of pre-programmed alternative pacing parameters for at least one mode and which can be independently reverted to. The pacemaker control circuitry is organized about a central bus into an I/O controller and a pacing controller. Pacing control is continuous and its I/O communications operate on a prioritized basis. I/O control permits the programming of any register and the interrogation of a variety of analog parameters associated therewith.

Programmable multi-mode cardiac pacemaker

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Minneapolis, MN, United States of America

Brian P Brockway