Implantable dynamic pressure transducer system

Claim 2

An implantable dynamic pressure and motion transducer system for use in an implantable medical device comprising: a force responsive transducer for converting a physiological signal into a corresponding electrical signal; buffer amplifier means, receiving said transducer electrical signal, and producing an amplified output signal; clock means for generating energizing pulses coupled to said buffer amplifier and said transducer for periodically activating said buffer amplifier and transducer; and signal recovery means responsive to said output signal for recovering a signal corresponding to said physiological signal.

Claim 3

The implantable dynamic pressure and motion transducer system of claim 1 further including: a hermetic sensor capsule for containing said force transducer and said buffer amplifier; a hermetic device can for containing said signal recovery means and additional signal utilization circuitry; and a lead system for interconnecting said sensor capsule and said device can.

Claim 4

The implantable dynamic pressure and motion transducer of claim 1 or 2 wherein: said buffer amplifier comprises a metal oxide field effect transistor (FET) operated in voltage-follower configuration with said transducer signal applied to the gate of said FET.

Claim 5

The implantable dynamic pressure and motion transducer of claim 3: wherein the drain connection of said FET is in common with one pacing terminal; and a pacing pulse generator for providing a stimulus to at least one pacing terminal for delivering stimulating energy to said organ.

Claim 6

An implantable dynamic pressure and motion transducer for use with an implantable pacer system of the type having a pulse generator for generating an electric stimulus pulse on a pacing electrode comprising: a force responsive transducer for converting a physiological force signal into a corresponding electrical signal; said transducer being incorporated in a transducer capsule incorporated in turn in a lead body for placement in cardiac tissue; buffer amplifier means adapted to receive said electrical signal, and producing an amplified output signal; said buffer amplifier means being incorporated in said transducer capsule; clock means for generating energizing pulses coupled to said buffer amplifier and said transducer for periodically activating said buffer amplifier and said transducer; signal recovery means responsive to said output signal for recovering a signal corresponding to said physiological signal.

Claim 7

An implantable dynamic pressure and motion transducer for use with an implantable pacer system of the type having a pulse generator for generating an electric stimulus pulse on a pacing electrode comprising: a force responsive transducer for converting a physiological force signal into a corresponding electrical signal; said transducer being incorporated in a transducer capsule incorporated in turn in a lead body for placement in cardiac tissue; buffer amplifier means adapted to receive said electrical signal, and producing an amplified output signal; said buffer amplifier means being incorporated in said transducer capsule; clock means for generating energizing pulses coupled to said buffer amplifier and said transducer for periodically activating said buffer amplifier and said transducer; signal recovery means responsive to said output signal for recovering a signal corresponding to said physiological signal.

Claim 8

The device of claim 5 wherein said lead body includes: multiple conductors embedded in a flexible body inert material; and said conductors being electrically connected to said transducer capsule to couple said implantable pacer.

Claim 9

The device of claim 6 including tines on said lead body positioning said transducer capsule in cardiac tissue to monitor the motion of the cardiac tissue.

Claim 10

The device of claim 6 including tines on said lead body for positioning said transducer capsule remote from cardiac tissue to monitor intracardiac pressure variations.

Claim 11

The device of claim 8 wherein said buffer amplifier is configured to provide full bandwidth pressure information to said signal recovery means.

Claim 12

The device of claim 8 wherein said buffer amplifier is configured to provide the time derivative of said physiological force signal to said signal recovery means for detecting cardiac pumping.