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Rate-responsive pacemaker having selectable response to arm movement and pedal impacts
| Details |
Inventors: Mann, Brian M.;
Assignee: Siemens Pacesetter, Inc. (Sylmar, CA)
Primary Examiner: Kamm; William E.
Assistant Examiner: Getzow; Scott M.
Attorney, Agent or Firm: Weinberg; Lisa P., Miller; Leslie S.
A rate-responsive pacemaker (10) generates stimulation pulses on demand at a rate determined by a sensor indicated rate (SIR) signal. The pacemaker includes, in a preferred embodiment, an activity sensor (26) that generates a raw sensor signal (27) as a function of sensed body motion. The raw sensor signal is processed by two parallel signal processing channels with each channel emphasizing a different aspect of the raw sensor signal. A first sensor processing channel (28) produces a first processed sensor signal (S.sub.A) that is more sensitive to arm motion than to pedal impacts. A second sensor processing channel (30) produces a second processed sensor signal (S.sub.B) that is more sensitive to pedal impacts than to arm motion. The first and second processed sensor signals are each weighted by a programmable amount, and are then combined to form the SIR signal. |
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DETAILED DESCRIPTION Accordingly, it is a general feature of the invention to provide a rate-responsive pacemaker wherein the aforementioned problems are eliminated and the aforementioned needs are met.
More specifically, it is a feature of the invention to provide a rate-responsive pacemaker using an activity sensor wherein the dominance of sensed pedal impacts in determining the SIR signal may be selectively controlled, and wherein the SIR signal is not dominated by arm motion, particularly arm motion of just one arm.
It is a further feature of the invention to provide a rate-responsive pacemaker wherein the raw sensor signal can be suitably processed to emphasize a selected aspect or aspects thereof, with the results of such processing thereafter being appropriately weighted in the formation of the SIR signal.
In this manner, the sensitivity of the resulting SIR signal to various sensed events, e.
g.
, pedal impacts and/or arm motion, may be selectively controlled by appropriate weighting of the raw sensor signal processing results.
Like rate-responsive pacemakers of the prior art, the rate-responsive pacemaker of the present invention includes at least one sensor that generates a raw sensor signal as a function of a sensed physiologic-related parameter, e.
g.
, body motion.
Further, like rate-responsive pacemakers of the prior art, the raw sensor signal is processed in order to determine a sensor indicated rate (SIR) signal.
The SIR signal is then used by the pacemaker in conventional manner to set the pacing rate at which the pacemaker provides stimulation pulses on demand, or as otherwise programmed.
Unlike rate-responsive pacemakers of the prior art, however, the rate-responsive pacemaker of the present invention includes parallel and independent sensor signal processing channels wherein the raw sensor signal is processed, with the results from each independent channel being weighted by an appropriate amount (the "weighting factor") in order to form the final SIR signal.
Each sensor signal processing channel is configured to emphasize a different aspect of the raw sensor signal
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Liquid Purification 
