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Apparatus for and method of programming the minimum energy threshold for pacing pulses to be applied to a patient's heart
| Details |
Inventors: Hartlaub, Jerome T.; Smith, Bobby L.; Powell, Richard M.;
Assignee: Medtronic, Inc. (Minneapolis, MN)
Primary Examiner: Kamm; William E.
Assistant Examiner:
Attorney, Agent or Firm: Gable; R. Lewis, Breimayer; Joseph F.
A method and apparatus is disclosed for programming a threshold mode of operation into a pacing generator whereby the minimum level of energy of the stimulating pulse as generated by the pacing generator is determined. First, the original level of energy of the stimulating pulses is determined when this mode is commenced. The original energy level and in particular the pulse width is decremented by a predetermined incremental amount, and an encoded signal indicative of the new reduced pulse width is transmitted to the pacing generator, whereby the pacing generator applies the pulses of the reduced pulse width to the patient's heart. Further, there is included means for counting the number of pulses of reduced pulse width and after the application of a given number of pulses by the pacing generator to the patient's heart, the programming apparatus programs a new energy level decremented from the previously programmed value to be then transmitted to the pacing generator. |
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DETAILED DESCRIPTION In accordance with this invention, there is disclosed a method of and a programmer for programming a threshold mode of operation into a pacing generator whereby the minimum level of energy of the stimulating pulse as generated by the pacing generator is determined.
The programmer includes means for determining the original level of energy of the stimulating pulses when this mode is commenced and for storing same, means for reducing the energy level and in particular the pulse width by a predetermined incremental amount, and transmitter means for transmitting an encoded signal indicative of the new reduced pulse width to the pacing generator, whereby the pacing generator applies the pulses of the reduced pulse width to the patient's heart.
Further, there is included means for counting the number of pulses of reduced pulse width and after the application of a given number of pulses by the pacing generator to the patient's heart, the programmer programs a new energy level decremented from the previously programmed value to be then transmitted to the pacing generator.
In a further aspect of this invention, there is included means for determining the level of energy of the pulse now being generated by the pacing generator and if below a predetermined critical level, for causing the programmer to transmit signals via its transmitter to the pacing generator instructing the pacing generator to return to the original, permanently encoded value of energy or pulse width.
Further, it is contemplated that the operator while utilizing the programmer of this invention, would also observe an EKG measuring device attached to the patient, whereby he could readily observe the effect of reducing the energy level and in particular the pulse width of the stimulating pulse.
At any point in this mode of programming, the operator may sense by his observation of the EKG display means that the pacing generator has lost capture of the patient's heart and may note upon the display means of the programmer the energy level or pulse width at which heart capture was lost
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Heat Accumulators 
