Cardiac pacer testing system
First Claim
1. Apparatus for measuring the R-wave sensitivity of a demand cardiac pacer comprising:
- (a) means for receiving pacer pulses from said cardiac pacer;
(b) means responsive to successive ones of received pacer pulses for producing pseudo R-waves of incrementally increasing amplitude;
(c) means for applying said pseudo R-wave signals to the R-wave sensing circuit of said cardiac pacer; and
(d) means for displaying the voltage amplitude of the pseudo R-wave just sufficient to cause resetting of the pulse generator of said demand cardiac pacer.
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Abstract
A hand-held, portable, battery-powered test instrument for evaluating the performance of cardiac pacer devices prior to the implantation thereof and afterwards. To test R-wave sensitivity of a pacer device, a series of simulated R-waves, each of a predetermined greater amplitude, is applied to the pacer unit under test, each such simulated R-wave occurring at a time following a preceding pacer pulse sufficient to ensure that the pacer'"'"'s refractory period has elapsed. This process is continued until a succeeding pacer pulse does not occur at the time it would otherwise be due, thus indicating that the R-wave had just reached the amplitude sufficient to cause the resetting of the pacer pulse generator. A count is maintained of the number of cycles needed to cause resetting of the pacer pulse generator and this value is displayed to indicate, in terms of voltage, the minimum amplitude of the R-wave just sufficient to result in pacer resetting.
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Citations
6 Claims
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1. Apparatus for measuring the R-wave sensitivity of a demand cardiac pacer comprising:
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(a) means for receiving pacer pulses from said cardiac pacer; (b) means responsive to successive ones of received pacer pulses for producing pseudo R-waves of incrementally increasing amplitude; (c) means for applying said pseudo R-wave signals to the R-wave sensing circuit of said cardiac pacer; and (d) means for displaying the voltage amplitude of the pseudo R-wave just sufficient to cause resetting of the pulse generator of said demand cardiac pacer. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for measuring the R-wave sensitivity response threshold of a demand cardiac pacer circuit comprising:
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(a) means for generating pseudo R-wave signals having an amplitude which is incremented in known, predetermined steps during successive cycles; (b) means for applying said generated pseudo R-wave signals to said pacer circuit; (c) means for sensing when said pacer circuit first responds to said generated pseudo R-wave signals; and (d) means for visually displaying the amplitude of the pseudo R-wave signal causing said pacer circuit to first respond to said generated pseudo R-wave signal.
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Specification