Pulse generator system and method for medical use

摘要

An electrical pulse generator system such as a cardiac pacemaker or defibrillator system includes an impedance measuring device which measures the impedance across pacemaker leads, a display device, and a controller which controls the display device to display at least the measured impedance upon each stimulation pulse, or an image showing the relationship between a first applied electrical signal, measured impedance, and a resulting electrical signal which varies according to Ohm's Law. The system may include a short circuit detector and a pulse amplitude control module which switches between normal mode and safe mode operation based on short circuit detection, with different maximum stimulation pulse amplitudes in the normal and safe modes.

主权项

1. A monitoring and control system for a medical pulse generator,
comprising: a control input for operator input of a selected nominal amplitude for a control parameter which varies stimulation pulse amplitude of a medical pulse generator, the control parameter comprising voltage or current;
an impedance monitoring module configured for connection to stimulation leads of the medical pulse generator to measure impedance during a stimulation pulse;a short circuit detection module which is configured to detect a short circuit condition; andan amplitude setting control module connected to the operator control input and associated with the impedance monitoring module and short circuit detection module, the amplitude setting control module being configured to select normal mode operation or safe mode operation of the pulse generator based on input from the short circuit detection module and to set a limited nominal amplitude for normal mode operation and a predetermined safety amplitude for safe mode operation;wherein the system operates in normal mode when no short circuit is detected and the impedance is within predetermined minimum and maximum levels, and operates in a safe mode if a short circuit is detected;the nominal amplitude in the normal mode comprising the operator selected nominal amplitude up to the preset limited nominal amplitude and comprising the preset limited nominal amplitude if the operator selected nominal amplitude at the control input is greater than the preset limited nominal amplitude when the control parameter is voltage or less than the preset limited nominal amplitude when the control parameter is current;the amplitude in the safe mode comprising the operator selected amplitude up to the predetermined safety amplitude and comprising the predetermined safety amplitude if the operator selected amplitude is greater than the predetermined safety amplitude when the control parameter is voltage or less than the predetermined safety amplitude when the control parameter is current; andan alarm device, the impedance monitoring module having an output connected to the alarm device and being configured to actuate the alarm device if a short circuit is detected again during safe mode operation of the system.