Implantable homing device

Claim 2

In an implantable homing device having a transmitter, and a source of power connected to apply operating current to said transmitter; the improvement wherein said source of power comprises oscillator means, a battery connected to energize said oscillator means, means applying the output of said oscillator means to said transmitter as a source of operating current therefor, whereby said transmitter is intermittently operated, said transmitter comprising an oscillator and a programmable signal generator connected to provide a programmable output coded signal for modulating said oscillator, and means responsive to the voltage of said battery for controlling said programmable generator, whereby the output of said transmitter is modulated as a function of the voltage of said battery.

Claim 3

The implantable homing device of claim 1 further comprising contact means connected to said battery to enable the external recharging thereof.

Claim 4

The implantable homing device of claim 1 wherein said oscillator means comprises a multivibrator.

Claim 5

The implatable homing device of claim 3 wherein said multivibrator comprises an astable multivibrator, and further comprising a transistor connected to apply the output of said multivibrator to said transmitter as the operating supply thereof.

Claim 6

The implantable homing device of claim 4 wherein said multivibrator has a duty cycle to supply operating current to said transmitter of no more than 1 millisecond in 5 minutes.

Claim 7

The implantable homing device of claim 1 wherein said generator is a voltage controlled oscillator and includes means for varying the output thereof in accordance with a determined code, whereby signals output from said transmitter may uniquely identify said device.

Claim 8

The implantable homing device of claim 6 wherein said voltage controlled oscillator is connected to operate in an FSK mode, and further comprising means for clocking the different frequency outputs of said oscillator.

Claim 9

The implantable homing device of claim 7 wherein said clocking means is connected to control the output of said oscillator in accordance with a determined program.

Claim 10

The implantable homing device of claim 6 further comprising monitor means connected to modify the output of said oscillator, whereby output signals of said device are modulated in accordance with the output of said monitor means.

Claim 11

The implantable homing device of claim 1 wherein said oscillator means comprises an astable multivibrator connected to have a duty cycle of no greater than 1 millisecond in one minute.

Claim 12

The implantable homing device of claim 1 wherein said oscillator means comprises an astable multivibrator and said transmitter comprises an oscillator, a programmable signal generator, and modulator means connected to modulate the output of said oscillator with the output of said signal generator, said signal generator comprising means for producing a signal having a frequency that varies in a predetermined manner.

Claim 13

The implantable homing device of claim 11 further comprising monitor means connected to said signal generator for modifying said predetermined manner of variation of said output of said generator.

Claim 14

The implantable homing device of claim 11 further comprising monitor means connected to said oscillator means for modifying the duty cycle thereof.

Claim 15

The implantable homing device of claim 11 further comprising monitor means connected to sense the voltage of said battery and to modify the output of said transmitter in response to a low battery voltage condition.

Claim 16

In an implantable homing device having a tranmitter, and a source of power connected to apply operating current to said transmitter; the improvement wherein said source of power comprises oscillator means, a battery connected to energize said oscillator means, means applying the output of said oscillator means to said transmitter as a source of operating current therefor, whereby said transmitter is intermittently operated, said transmitter comprising an oscillator and a programmable signal generator connected to provide a programmable output coded signal for modulating said oscillator, monitor means connected to said programmable signal generator and responsive to determined stimulus, whereby said transmitter is modulated as a function of said stimulus, and means coupling said monitor means to said oscillator means for controlling the frequency of oscillation thereof, whereby the rate of output of said device is varied in response to said stimulus.

Claim 17

In an implantable homing device having a tranmitter, and a source of power connected to apply operating current to said transmitter; the improvement wherein said source of power comprises oscillator means, a battery connected to energize said oscillator means, means applying the output of said oscillator means to said transmitter as a source of operating current therefor, whereby said transmitter is intermittently operated, said transmitter comprising an oscillator and a programmable signal generator connected to provide a programmable output coded signal for modulating said oscillator, monitor means connected to said programmable signal generator and responsive to determined stimulus, whereby said transmitter is modulated as a function of said stimulus, and means coupling said monitor means to said oscillator means for controlling the frequency of oscillation thereof, whereby the rate of output of said device is varied in response to said stimulus.

Claim 18

The implantable homing device of claim 15 further comprising means responsive to a determined stimulus and connected to said oscillator means for increasing the duty cycle of said oscillator means, whereby the rate of output of said device is increased in response to said stimulus.