Electrophysiology study system using implantable cardioverter/pacer

• US 4,705,043 A
• Filed: 07/05/1985
• Issued: 11/10/1987
• Est. Priority Date: 07/05/1985
• Status: Expired due to Term

• Current Assignee: Mirowski Family Ventures LLC
• Original Assignee: Mieczslaw Mirowski
• Inventors: Imran, Mir
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US06/751,964
• Time in Patent Office: 858 Days
• Field of Search: 128/419 PG, 128/419 PT, 128/697, 128/903
• US Class Current: 607/4
• CPC Class Codes: A61N 1/365 controlled by a physiological parameter, e.g. heart potential evoked response A61N1/371
• CPC Class Codes: A61N 1/37211 Means for communicating with stimulators
• CPC Class Codes: Y10S 128/903 Radio telemetry

Abstract

An electrophysiology (EP) study system using an implantable cardioverter/pace. The system includes an implantable unit having a conventional programmable pace capable of operation in at least the VVT mode. The implantable unit transmits ECG data, in real time, externally of the patient and receives pacing pulse signals from an external unit. The pacing pulse signals are detected and provided to a trigger input of the pacer placed in the VVT mode. Simultaneously, the ECG data is transmitted to the external unit. The external unit detects the ECG data and provides the data to a conventional programmable electrical stimulator. The stimulator pacing pulse output is transmitted to the internal unit and provided to the trigger input of the pacer.

Claims

1. A system for conducting electrophysiology studies using an implantable cardioverter/pacer comprising:

an external electrical stimulator including means for receiving ECG data and means for providing pacer stimulating pulse data in accordance with control information manually provided by the operator of the system;

an external transceiver including means for transmitting the pacer stimulating pulse data to an implantable pacer/control system, means for receiving ECG data from the implantable pacer/control system, and means for providing the ECG data to the external electrical stimulator;

an implantable pacer/control system comprising;

implantable electrode means for sensing ECG activity of the heart and for delivering pacing pulses to the heart;

ECG transmitter means operatively connected with said implantable electrode means for transmitting ECG data, sensed by the electrode means, externally of the patient;

receiving means for receiving and detecting the pacer stimulating pulse data and for providing pulse command signals in accordance with the detected pacer stimulating pulse data;

R-wave detecting means coupled with said electrode means for detecting R-waves and for providing R-wave pulse signals corresponding to the detected R-waves;

switching means for selectively coupling said receiving means and said R-wave detecting means with an implantable pacing means;

control means for controlling said switching means to selectively couple one of said receiving means and R-wave detecting means with the implantable pacing means; and

implantable pacing means for delivering pacing pulses to said implantable electrodes synchronous with either the pulse command signals of said receiving means or the R-wave pulse signals of said R-wave detecting means.

2. The system of claim 1 wherein said external transceiver further comprises means for transmitting an electrophysiology (EP) mode control signal to said receiving means of the implantable pacer/control system and wherein said receiving means includes means for decoding the EP mode control signal and for providing the decoded EP mode control signal to said control means and wherein said control means provides a switch control signal to said switching means, upon receipt of the decoded EP mode control signal, to couple said receiving means with said implantable pacing means.

3. The system of claim 2 wherein said control means provides a VVT control signal to said implantable pacing means, upon receipt of the decoded EP mode control signal, to place said implantable pacing means in a VVT mode.

4. The system of claim 2 wherein said control means provides a transmitter enabling signal to said ECG transmitter means to enable said ECG transmitter to transmit ECG data to said external transceiver means.

5. The system of claim 1 wherein said external transceiver comprises an RF transmitter for transmitting pacer stimulating pulse data and an audio FM decoder for receiving and decoding the ECG data.

6. The system of claim 5 wherein said ECG transmitter means comprises an audio FM transmitter for transmitting ECG data to said external audio FM decoder, said external audio FM decoder including an output coupled to said means for receiving ECG data.

7. The system of claim 1 wherein said ECG transmitter means includes means for transmitting ECG data as the ECG data is sensed by said implantable electrode means.

8. The system of claim 1 wherein said implantable pacing means includes a cardioverter/defibrillator means for detecting an arrhythmia condition and for automatically cardioverting and defibrillating the heart in response to the detection of an arrhythmia condition.

9. A control for an implantable multi-mode pacer for conducting electrophysiology (EP) studies, comprising:

an R-wave detector including means for sensing the electrical activity of the heart, means for detecting the heart R-waves, and means for providing R-wave signals corresponding to the detected R-waves;

pulse command means including means for receiving and providing externally generated pacing pulse command signals and externally generated mode control signals;

implantable multi-mode pacing means for pacing the ventricle of a heart in at least the VVT mode and including a mode control input and a trigger input;

switching means for selectively coupling the R-wave signals or the pulse command signals to the trigger input of said pacing means in accordance with a switch control signal from a control means;

control means coupled with said pulse command means for providing a switch control signal to said switching means and a mode control signal to the mode control input of said pacing means, said switch control signal having a first state in absence of receipt of a mode control signal to couple the R-wave signals to said trigger input and a second state upon receipt of a mode control signal to couple the pulse command signals to said trigger input, said control means further comprising means for placing the pacing means in a VVT mode upon receipt of a mode control signal whereby the pacing pulse output of the pacing means is synchronized with said R-wave signals or said pulse command signals.

10. A system for conducting electrophysiology studies using an implantable pacer operable in the VVT mode comprising:

an implantable unit including,

a pacer operable in at least the VVT mode and having a trigger input;

R-wave detecting means for detecting heart R-waves;

receiving means for receiving pulse command signals generated externally of the patient;

switching means for selectively connecting either the R-wave detecting means or the receiving means to said trigger input of said pacer;

control means for controlling the switching means in accordance with mode control signals generated externally of the patient; and

an external unit including,

transmission means for transmitting pulse command signals and mode control signals to the implantable unit.