Matches 101 - 136 out of 136 < 1 2 3
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4488555 Battery condition warning system for medical implant  
A battery condition warning system for use in a battery powered medical implant device which generates an audible alarm to warn the patient of an impending battery failure. The warning system...
4481950 Acoustic signalling apparatus for implantable devices  
Acoustic signalling apparatus is provided for use with implantable devices for therapeutic, diagnostic or other medical or scientific purposes, for implantation in living animal bodies, including...
4448197 Heart pacer end-of-life detector  
A heart pacer in which the magnitude of the end-of-life test current source is programmable. This effectively allows the physician to program the condition which will control a switch-over to...
4445512 Method and apparatus for evaluating pacer battery status and stimulation effectiveness  
A pacemaker of the inhibited demand type which is equipped with a battery and pacemaker efficiency evaluator. A magnetically initialized test circuit synchronizes the timing of test stimulating...
4416282 Cardiac pacer with improved, output circuitry  
A fully implantable programmable cardiac pacer includes two main pacing channels driven by a crystal oscillator circuit. For each channel, amplitude and pulse width are programmed in paired...
4390020 Implantable medical device and power source depletion control therefor  
A programmable pulse generator capable of operating in several atrial and ventricular pacing modes having atrial and ventricular sense amplifiers and output circuits, programmable memory and clock...
4345603 Implantable battery monitoring means and method  
A method and apparatus for monitoring the status of a battery in an implantable device for a human, the device being a tissue stimulator, drug dispensing apparatus, or the like. More specifically,...
4291703 Pacemaker monitoring recorder  
A recorder for monitoring the operation of a cardiac pacemaker and the response of the patient to the pacemaker includes a recorder module which receives a composite signal including an ECG signal,...
4290429 Battery monitoring circuit in a cardiac pacemaker  
In a monitoring circuit for monitoring the state of the battery of a card pacemaker, which pacemaker includes an energy storage element normally connected to be charged by the battery and to...
4276883 Battery monitor for digital cardiac pacemaker  
A programmable cardiac pacemaker pulse generator utilizing digital circuitry for controlling the provision of cardiac stimulating pulses. The pulse generator is capable of having the rate, the...
4263915 Digital cardiac pacemaker with hysteresis  
A programmable cardiac pacemaker pulse generator utilizing digital circuitry for controlling the provision of cardiac stimulating pulses. The pulse generator is capable of having the rate, the...
4231027 Battery monitoring means for an implantable living tissue stimulator  
A battery monitoring means for an implantable living tissue stimulator system in which various battery voltages are telemetered to an external receiving means, these voltages being related to the...
4140131 Body tissue stimulation apparatus with warning device  
Apparatus for stimulating body tissue and in particular the heart, is disclosed as including a device or circuit responsive to the initiation of stimulation and/or to the failure or pending failure...
4120307 Cardiac pacemaker  
Apparatus for indicating end of battery life in a cardiac pacemaker. A battery voltage monitoring circuit provides an indication of battery voltage drop below a predetermined level. A counter...
4102346 Heart pacemaker monitor, alarm and auxiliary power supply  
A monitor device electronically connected to a pacemaker and to an alarm device counts the pulses supplied to the heart by the pacemaker, detects the signal level of the pulses and compares the...
4099530 Cardiac pacer circuitry to facilitate testing of patient heart activity and pacer pulses  
A demand cardiac pacer having provisions for determining power source life status both during normal heart operation and during heart stimulation by the pacer. An external magnetic pulse of...
4095603 Cardiac pacer employing discrete frequency changes  
In the implantable cardiac pacer disclosed herein, a drop in battery voltage is signalled by a discrete change in the stimulation frequency of the pacer. Reliably distinct frequencies are obtained...
3927366 Method for determining the end of life of a pulse generator power source  
A regulator for a pulse generator which acts to decrease the output of the pulse generator in a linear fashion such that each pulse has an amplitude which is lower by a generally constant known...
3901247 End of life increased pulse width and rate change apparatus  
Pulse generating circuitry which can be used, for example, in an adjustable pulse width pacemaker. The circuitry increases the output pulse width as the power source output is decreased below a...
3888260 Rechargeable demand inhibited cardiac pacer and tissue stimulator  
An improved demand inhibited cardiac pacer or human tissue stimulator employs a rechargeable battery to furnish operating power to electronic pulse generating circuitry which generates output...
3857085 PULSE GENERATOR OUTPUT REGULATOR  
A regulator for a pulse generator used in heart pacers acts to decrease the output of the pulse generator in a linear fashion such that each pulse has an amplitude which is lower by a generally...
3841336 PACER BATTERY FAILURE DETECTION CIRCUIT  
There is disclosed a conventional-type demand pacer to which there is added a voltage-controlled oscillator whose frequency is dependent upon the magnitude of the pacer battery voltage. The...
3825016 IMPLANTABLE CARDIAC PACEMAKER WITH BATTERY VOLTAGE-RESPONSIVE RATE  
An implantable cardiac pacer including a voltage level detector for responding when the voltage of the pacer power source falls below a predetermined level. Response of the voltage detector gives a...
3789854 DUAL MODE CARDIAC PACER POWER SOURCE  
A power source for a cardiac pacer operative in first and second states to provide respectively redundant battery power to said pacer and series connected battery power to said pacer. The...
3759266 CARDIAC-AUTOPACER WITH VARIABLE REFRACTORY, NON-LINEAR FEEDBACK, LATCHING RESET AND VOLTAGE INCREASING CIRCUITS  
A self-contained, implantable cardiac-autopacer providing ultra long battery life and high reliability through parallel battery redundancy and circuit techniques. The cardiac-autopacer operates in...
3756246 APPARATUS FOR EXTERNALLY DETERMINING ACTUAL OUTPUT OF AN IMPLANTED ENERGY SOURCE  
Apparatus for externally determining actual output of an implanted energy source used for powering an electronic device implanted within a patient. The apparatus includes test circuitry and an...
3746005 CONSTANT ENERGY HEARTBEAT STIMULATING APPARATUS WITH PULSE WIDTH CONTROL  
Pulse-width controlled heartbeat stimulating apparatus. The apparatus includes an electrical power supply and a pulser for generating stimulation pulses on terminals connected to a patient's heart....
3746006 CONTROLLED ENERGY OUTPUT PACER  
A controlled energy output pacer. The apparatus includes an electrical power supply and a pulser for generating stimulation pulses on terminals connected to a patient's heart. An integral control...
3738371 CARDIAC PACERS WITH SOURCE CONDITION-RESPONSIVE RATE  
In a pulse generating circuit, such as an implantable cardiac pacer having parallel connected batteries as its power supply, additional resistors are connected between the power supply and the...
3718909 RATE CONTROLLER AND CHECKER FOR PULSE GENERATOR MEANS  
A remotely-operated control for and electrical pulse generating means, such as a cardiac pacer including timing means controlling the generation of pulses and signal responsive means for resetting...
3713449 CARDIAC PACER WITH EXTERNALLY CONTROLLABLE VARIABLE WIDTH OUTPUT PULSE  
An implantable cardiac pacer having electrode means adapted to be connected to the hart and electrical circuitry connected to the electrodes for providing hart stimulation pulses. The electrical...
3474353 MULTIVIBRATOR HAVING PULSE RATE RESPONSIVE TO BATTERY VOLTAGE  
3454012 RECHARGEABLE HEART STIMULATOR  
3253596 Cardiac pacer  
3195540 Power supply for body implanted instruments  
3135264 Heart monitor-automatic control device  
Matches 101 - 136 out of 136 < 1 2 3